WO1994000789A1 - Sunglasses having electro-optical screens - Google Patents

Sunglasses having electro-optical screens Download PDF

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Publication number
WO1994000789A1
WO1994000789A1 PCT/FR1993/000572 FR9300572W WO9400789A1 WO 1994000789 A1 WO1994000789 A1 WO 1994000789A1 FR 9300572 W FR9300572 W FR 9300572W WO 9400789 A1 WO9400789 A1 WO 9400789A1
Authority
WO
WIPO (PCT)
Prior art keywords
electro
photo
electronic circuit
active area
electrical connections
Prior art date
Application number
PCT/FR1993/000572
Other languages
French (fr)
Inventor
Jean-Pierre Girard
Original Assignee
Girard Jean Pierre
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Girard Jean Pierre filed Critical Girard Jean Pierre
Priority to EP93913128A priority Critical patent/EP0601158A1/en
Publication of WO1994000789A1 publication Critical patent/WO1994000789A1/en

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F9/00—Methods or devices for treatment of the eyes; Devices for putting-in contact lenses; Devices to correct squinting; Apparatus to guide the blind; Protective devices for the eyes, carried on the body or in the hand
    • A61F9/02—Goggles
    • A61F9/022—Use of special optical filters, e.g. multiple layers, filters for protection against laser light or light from nuclear explosions, screens with different filter properties on different parts of the screen; Rotating slit-discs
    • A61F9/023—Use of special optical filters, e.g. multiple layers, filters for protection against laser light or light from nuclear explosions, screens with different filter properties on different parts of the screen; Rotating slit-discs with variable transmission, e.g. photochromic
    • G—PHYSICS
    • G02—OPTICS
    • G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
    • G02C7/00—Optical parts
    • G02C7/10—Filters, e.g. for facilitating adaptation of the eyes to the dark; Sunglasses
    • G02C7/101—Filters, e.g. for facilitating adaptation of the eyes to the dark; Sunglasses having an electro-optical light valve
    • G—PHYSICS
    • G02—OPTICS
    • G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
    • G02C7/00—Optical parts
    • G02C7/12—Polarisers
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/13306—Circuit arrangements or driving methods for the control of single liquid crystal cells
    • G02F1/13318—Circuits comprising a photodetector

Definitions

  • the present invention presents sunglasses with electro-optical screens controlled automatically as a function of the light which reaches them.
  • the present invention applies to electronic cameras, sunglasses and anti-fog and to the protection of the eyes of welders.
  • the filters known to date produced chemically or mechanically carry out a predetermined and invariable filtering as a function of the light which reaches them.
  • the present invention intends to remedy this drawback by presenting a device having a photo-sensitive sensor controlling the transparency of electro-optical screens as a function of the decreasing light intensity it receives.
  • the present invention presents an assembly of liquid crystal screens and polarizers adapted to have a very uniform contrast in a solid angle corresponding to the vision of the eye through glasses.
  • the present invention presents a mode of electrical connection of liquid crystal screens adapted to avoid the feeling of wave due to the progressive obscuration laterally of a liquid crystal screen.
  • the device which is the subject of the present invention is therefore a device for filtering light rays comprising a photo-sensitive sensor adapted to emit a continuous primary signal of increasing power as a function of the light intensity reaching it, an electronic circuit electrically connected to the
  • ISA / EP REPLACEMENT SHEET photo-sensitive sensor and emitting an alternating secondary signal of increasing power with the power of the signal emitted by the photo-sensitive sensor and two electro ⁇ optical screens operating in positive and placed on spectacle frames and comprising "each an active zone, of connected form, adapted to be placed in front of an eye and connected by electrical connections to the output of the electronic circuit, characterized in that at least two of the contacts between the electrical connections with the associated active area are distant from each other by a distance greater than a quarter of the largest dimension of the associated active area.
  • Figure 1 shows a front view of the pair of glasses according to the invention.
  • FIG. 2 represents a sectional view of one of the electro-optical screens incorporated in the device represented in FIG. 1.
  • FIG. 3 represents an active area and electrical connections incorporated in the device presented in FIG. 1.
  • FIG. 4 represents polarizers which can be incorporated in the device presented in FIG. 1.
  • FIG. 5 represents a block diagram of an electronic circuit incorporated in the device presented in FIG. 1.
  • FIG. 6 represents an electronic diagram realizing the functions of the block diagram presented in FIG. 5.
  • a spectacle frame 1 a photo-sensitive sensor 2, an electronic circuit 3, two electro-optical filters 5 and 6 comprising active zones 7 and 8, respectively, and electrical connections 4 connecting the circuit electronics 3 and the active zones 7 and 8 of the electro-optical filters 5 and 6.
  • the spectacle frame 1 is of known type. It is suitable for mechanically holding the other components shown in FIG. 1.
  • the frame 1 can be produced by molding or by machining of plastic, metal or artificial material parts.
  • the photo-sensitive sensor 2 is adapted to emit a continuous signal whose power is an increasing function of the total light intensity which is incident to it.
  • the photo-sensitive sensor 2 can consist of a photo-diode, a photo-resistance powered by an electric cell or a solar cell.
  • the electronic circuit 3 is electrically connected to the photo-sensitive sensor 2 and is adapted to emit an alternating signal of increasing power with the power of the signal emitted by the photo-sensitive sensor 2.
  • An example of electronic circuit 3 is given in FIG. 6.
  • the electro-optical filters 5 and 6 are presented with reference to FIGS. 2, 3 and 4. They operate in positive, that is to say that their transparency decreases with the power of the electrical signal applied to them.
  • the electro-optical filters 5 and 6 respectively comprise the active zones 7 and 8 presented in FIG. 3. These active zones 7 and 8 are adapted to be positioned each in front of one of the eyes of the user of the device which is the subject of the present invention.
  • the active areas 7 and 8 are related in the mathematical sense of the term, that is to say that all the line segments connecting any two points of each active area are integrally in the active area.
  • the electrical connections 4 are presented with reference to FIG. 3. They electrically connect the electronic circuit 3 and each of the electro-optical filters 5 and 6.
  • FIG. 2 shows a sectional view of one of the electro-optical screens incorporated in the device shown in Figure 1.
  • an anti-scratch treatment 9 a polarizer 10
  • a layer glue 11 a glass slide 52
  • an electrode 13 an orientation layer 14
  • a liquid crystal 15 an orientation layer 53
  • an electrode 17, a glass slide 19 a layer of glue 20
  • a polarizer 21 an active area 7 and, laterally positioned around the liquid crystal 15 and between the orientation layers 14 and 53, a strip of adhesive 22.
  • the anti-scratch treatment 9 is carried out on the polarizer 10 in a known manner.
  • the polarizers 10 and 21 are of known type. They are glued to the glass slides 52 and 19 by the adhesive layers 11 and 20.
  • the electrodes 13 and 17 are transparent and of known type and produced on the glass slides 52 and 19.
  • the orientation layers 14 and 53 and the adhesive tape 22 are of known type in the production liquid crystal displays.
  • the liquid crystal 15 is of the nematic helical type with a helix making a quarter of its pitch, that is to say ninety degrees.
  • the orientations of the polarizers and the orientation layers are presented in FIG. 4.
  • the connected active area 7 is the largest connected part of the superposition of the electrodes 13 and 17.
  • FIG. 3 represents an active zone and electrical connections incorporated in the device presented in FIG. 1.
  • the electro-optical filter 5 comprising the electrodes 13 and 17, the active area 7 between parts of electrodes 26 and 27 and segments of electrodes 23, 24 and 25, and the electrical connections 4 .
  • the electrode 13 is made up of the segments 23 and 24, on the one hand, and of the electrode part 26, on the other hand.
  • the electrode 17 consists of the segment 25, on the one hand, and the electrode part 27, on the other hand.
  • the electrode parts 26 and 27 exactly overlap, are identical to the related active area 7 and define it.
  • FIG. 4 represents polarizers which can be incorporated in the device presented in FIG. 1.
  • FIG 4 In Figure 4 are represented four arrows F10, F14, F53 and F21.
  • the arrow F10 represents the direction of polarization of the polarizer 10.
  • the arrow F14 represents the direction of orientation of the orientation layer 14.
  • the arrow F53 represents the direction of the orientation layer 53.
  • the arrow F21 represents the direction of polarization of the polarizer 21.
  • the arrows F14 and F53 are perpendicular, which is known in the manufacture of helical nematic liquid crystal displays.
  • the arrow F10 is inclined to the left and has with the arrow F14 an angle of 5 degrees in the counterclockwise direction.
  • the arrow F21 is inclined downward and has with the arrow F53 an angle of 5 degrees in the direction opposite to the trigonometric direction.
  • the angle between the polarization directions of the polarizers 10 and 21 is therefore 100 degrees. It should be noted that other values of inclinations with respect to the directions of the orientation layers are also in accordance with the spirit of the invention and that the values of the angles between the orientation layers and the polarizers can be different. or in the same trigonometric direction.
  • FIG. 5 represents a block diagram of an electronic circuit incorporated in the device presented in FIG. 1.
  • the electro-optical filters 5 and 6 the parts of electrodes 26 and 27 the electrical connections 4, an electrical power source 28, the photo-sensitive sensor 2 and two oscillators 50 and 51.
  • the electrical power source 28 can consist of a battery or be incorporated into the photo-sensitive sensor 2, in the form of solar cells .
  • Electric oscillators 50 and 51 are connected - 1 -
  • the electric oscillators 50 and 51 deliver alternating signals of the same amplitude and the same frequency but in phase opposition. In this way, the signals received by the liquid crystal 15, between the electrode parts 26 and 27, have the same frequency as the signals emitted by the oscillators 50 and 51 but with a doubled amplitude.
  • FIG. 6 represents an electronic diagram realizing the functions of the block diagram presented in FIG. 5.
  • FIG. 6 solar cells 30, a capacitor 31, a resistor 32, a resistor 33, a capacitor 34, a potentiometer 35, two transistors 36 and 37, a capacitor 38, four inverting schmit triggers 39, 40, 41 and 42 and electrical connections 12 and 16.
  • the potentiometer 35 controls the gain of the variable gain amplifier consisting of the two transistors 36 and 37.
  • the electronic circuit the diagram of which is given in FIG. 6, is easy to understand and to realize for the man of the art. Its description is therefore not more detailed.
  • the electrical connections 12 and 16 are respectively connected to the electrode portions 26 and 27 and thus constitute the connections 4 presented in FIGS. 1 to 5.
  • the solar cells 30 constitute the photo-sensitive sensor 2 and the electric power source 28.
  • the polarization axis of the front polarizers of each of the electro-optical screens 5 and 6 is vertical.
  • the birefringence of the liquid crystal 15 and its thickness are jointly adapted to the first minimum of the Gooch and Tarry curve, their product being substantially equal to 500 nm.

Abstract

A light beam filtering device comprising a light sensor (2), an electronic circuit (3) and two positive-operating electro-optical screens (5, 6) arranged on a spectacle frame (1). Each electro-optical screen comprises a correspondingly-shaped active area located in front of the eye and connected via electrical connections (4) to the ouput of the electronic circuit (3). The device is characterized in that two or more of the contacts between the electrical connections and the respective active area are separated by a distance equivalent to over a quarter of the largest dimension of said active area.

Description

LUNETTES SOLAIRES A ECRANS ELECTRO-OPTIQUES La présente invention présente des lunettes solaires à écrans électro-optiques commandés automatiquement en fonction de la lumière qui les atteint. The present invention presents sunglasses with electro-optical screens controlled automatically as a function of the light which reaches them.
En particulier, la présente invention s'applique aux caméras électroniques, aux lunettes solaires et anti-brouillard et à la protection des yeux de soudeurs.In particular, the present invention applies to electronic cameras, sunglasses and anti-fog and to the protection of the eyes of welders.
Les filtres connus à ce jour réalisés chimiquement ou mécaniquement réalisent un filtrage prédéterminé et invariable en fonction de la lumière qui les atteint. La présente invention entend remédier à cet inconvénient en présentant un dispositif possédant un capteur photo-sensible commandant la transparence d'écrans électro-optiques en fonction décroissante de l'intensité lumineuse qu'il capte. En particulier, la présente invention présente un assemblage d'écrans à cristaux liquides et de polariseurs adapté à posséder un contraste très uniforme dans un angle solide correspondant à la vision de l'oeil à travers des lunettes.The filters known to date produced chemically or mechanically carry out a predetermined and invariable filtering as a function of the light which reaches them. The present invention intends to remedy this drawback by presenting a device having a photo-sensitive sensor controlling the transparency of electro-optical screens as a function of the decreasing light intensity it receives. In particular, the present invention presents an assembly of liquid crystal screens and polarizers adapted to have a very uniform contrast in a solid angle corresponding to the vision of the eye through glasses.
De plus la présente invention présente un mode de connexion électrique d'écrans à cristaux liquides adapté à éviter la sensation de vague dû à l'obscurcissement progressif latéralement d'un écran à cristaux liquides.In addition, the present invention presents a mode of electrical connection of liquid crystal screens adapted to avoid the feeling of wave due to the progressive obscuration laterally of a liquid crystal screen.
Le dispositif objet de la présente invention est donc un dispositif de filtrage de rayons lumineux comportant un capteur photo-sensible adapté à émettre un signal primaire continu de puissance croissante en fonction de l'intensité lumineuse qui l'atteint, un circuit électronique électriquement relié auThe device which is the subject of the present invention is therefore a device for filtering light rays comprising a photo-sensitive sensor adapted to emit a continuous primary signal of increasing power as a function of the light intensity reaching it, an electronic circuit electrically connected to the
FEUILLE DE REMPLACEMENT ISA/EP capteur photo-sensible et émettant un signal secondaire alternatif de puissance croissante avec la puissance du signal émis par le capteur photo-sensible et deux écrans électro¬ optiques fonctionnant en positif et placés sur des montures de lunetterie et comportant "chacun une zone active, de forme connexe, adaptée à être placée devant un oeil et reliée par des liaisons électriques à la sortie du circuit électronique caractérisé en ce que deux au moins des contacts entre les liaisons électriques avec la zone active connexe sont éloignés entre eux d'une distance supérieure à un quart de la plus grande dimension de la zone active connexe.ISA / EP REPLACEMENT SHEET photo-sensitive sensor and emitting an alternating secondary signal of increasing power with the power of the signal emitted by the photo-sensitive sensor and two electro¬ optical screens operating in positive and placed on spectacle frames and comprising "each an active zone, of connected form, adapted to be placed in front of an eye and connected by electrical connections to the output of the electronic circuit, characterized in that at least two of the contacts between the electrical connections with the associated active area are distant from each other by a distance greater than a quarter of the largest dimension of the associated active area.
La description qui va suivre, faite dans un but explicatif et nullement limitatif permet de mieux comprendre les avantages, buts et caractéristiques de l'invention. La figure 1 représente une vue de face de la paire de lunettes selon l'invention.The description which follows, given for explanatory purposes and in no way limiting, allows a better understanding of the advantages, aims and characteristics of the invention. Figure 1 shows a front view of the pair of glasses according to the invention.
La figure 2 représente une vue en coupe d'un des écrans électro-optiques incorporés dans le dispositif représenté en figure 1. La figure 3 représente une zone active et des connexions électriques incorporés dans le dispositif présenté en figure 1.FIG. 2 represents a sectional view of one of the electro-optical screens incorporated in the device represented in FIG. 1. FIG. 3 represents an active area and electrical connections incorporated in the device presented in FIG. 1.
La figure 4 représente des polariseurs pouvant s'incorporer dans le dispositif présenté en figure 1.FIG. 4 represents polarizers which can be incorporated in the device presented in FIG. 1.
La figure 5 représente un schéma-bloc d'un circuit électronique incorporé dans le dispositif présenté en figure 1.FIG. 5 represents a block diagram of an electronic circuit incorporated in the device presented in FIG. 1.
La. figure 6 représente un schéma électronique réalisant les fonctions du schéma-bloc présenté en figure 5. Dans la figure 1 sont représentés un monture de lunetterie 1, un capteur photo-sensible 2, un circuit électronique 3, deux filtres électro-optiques 5 et 6 comportant des zones actives 7 et 8, respectivement, et des connexions électriques 4 reliant le circuit électronique 3 et les zones actives 7 et 8 des filtres électro-optiques 5 et 6.FIG. 6 represents an electronic diagram realizing the functions of the block diagram presented in FIG. 5. In FIG. 1 are shown a spectacle frame 1, a photo-sensitive sensor 2, an electronic circuit 3, two electro-optical filters 5 and 6 comprising active zones 7 and 8, respectively, and electrical connections 4 connecting the circuit electronics 3 and the active zones 7 and 8 of the electro-optical filters 5 and 6.
La monture de lunetterie 1 est de type connu. Elle est adaptée à tenir mécaniquement les autres composants présentés en figure 1. En particulier, la monture 1 peut être réalisée par moulage ou par usinage de pièces en plastique, en métal ou en matériaux artificiels.The spectacle frame 1 is of known type. It is suitable for mechanically holding the other components shown in FIG. 1. In particular, the frame 1 can be produced by molding or by machining of plastic, metal or artificial material parts.
Le capteur photo-sensible 2 est adapté à émettre un signal continu dont la puissance est une fonction croissante de l'intensité lumineuse totale qui lui est incidente. Par exemple, le capteur photo-sensible 2 peut être constitué d'une photo-diode, d'une photo-résistance alimentée par un pile électrique ou d'une cellule solaire.The photo-sensitive sensor 2 is adapted to emit a continuous signal whose power is an increasing function of the total light intensity which is incident to it. For example, the photo-sensitive sensor 2 can consist of a photo-diode, a photo-resistance powered by an electric cell or a solar cell.
Le circuit électronique 3 est relié électriquement au capteur photo-sensible 2 et est adapté à émettre un signal alternatif de puissance croissante avec la puissance du signal émis par le capteur photo-sensible 2. Un exemple de circuit électronique 3 est donné en figure 6.The electronic circuit 3 is electrically connected to the photo-sensitive sensor 2 and is adapted to emit an alternating signal of increasing power with the power of the signal emitted by the photo-sensitive sensor 2. An example of electronic circuit 3 is given in FIG. 6.
Les filtres électro-optiques 5 et 6 sont présentés en regard des figures 2, 3 et 4. Ils fonctionnent en positif, c'est à dire que leur transparence diminue avec la puissance du signal électrique qui leur est appliqué. Les filtres électro¬ optiques 5 et 6 comportent respectivement les zones actives 7 et 8 présentées en figure 3. Ces zones actives 7 et 8 sont adaptées à être positionnées chacune devant un des yeux de l'utilisateur du dispositif objet de la présente invention. Les zones actives 7 et 8 sont connexes au sens mathématique du terme, c'est à dire que tous les segments de droites reliant deux points quelconques de chaque zone active sont intégralement dans la zone active.The electro-optical filters 5 and 6 are presented with reference to FIGS. 2, 3 and 4. They operate in positive, that is to say that their transparency decreases with the power of the electrical signal applied to them. The electro-optical filters 5 and 6 respectively comprise the active zones 7 and 8 presented in FIG. 3. These active zones 7 and 8 are adapted to be positioned each in front of one of the eyes of the user of the device which is the subject of the present invention. The active areas 7 and 8 are related in the mathematical sense of the term, that is to say that all the line segments connecting any two points of each active area are integrally in the active area.
Les liaisons électriques 4 sont présentés en regard de la figure 3. Elles relient électriquement le circuit électronique 3 et chacun des filtres électro-optiques 5 et 6.The electrical connections 4 are presented with reference to FIG. 3. They electrically connect the electronic circuit 3 and each of the electro-optical filters 5 and 6.
Pour chaque zone active connexe 7 ou 8, deux au moins des contacts entre les liaisons électriques 4 avec la zone active connexe sont éloignés entre eux d'une distance supérieure à un quart de la plus grande dimension de la zone active connexe. La figure 2 représente une vue en coupe d'un des écrans électro-optiques incorporés dans le dispositif représenté en figure 1. Dans la figure 2 sont représentés successivement de haut en bas, un traitement anti-rayure 9, un polariseur 10, une couche de colle 11, une lame de verre 52, une électrode 13, une couche d'orientation 14, un cristal liquide 15, une couche d'orientation 53, une électrode 17, une lame de verre 19, une couche de colle 20, un polariseur 21, une zone active 7 et, latéralement positionnés autour du cristal liquide 15 et entre les couches d'orientation 14 et 53, un ruban de colle 22. Le traitement anti-rayure 9 est réalisé sur le polariseur 10 de manière connue. Les polariseurs 10 et 21 sont de type connus. Ils sont collés sur les lames de verre 52 et 19 par les couches de colle 11 et 20. Les électrodes 13 et 17 sont transparentes et de type connu et réalisées sur les lames de verre 52 et 19. Les couches d'orientation 14 et 53 et le ruban de colle 22 sont de types connu dans la réalisation d'écrans à cristaux liquides. Le cristal liquide 15 est de type nématique en hélice avec une hélice réalisant un quart de son pas, soit quatre-vingt-dix degrés. Les orientations des polariseurs et des couches d'orientations sont présentés en figure 4.For each related active area 7 or 8, at least two of the contacts between the electrical connections 4 with the related active area are distant from each other by a distance greater than a quarter of the largest dimension of the related active area. 2 shows a sectional view of one of the electro-optical screens incorporated in the device shown in Figure 1. In Figure 2 are shown successively from top to bottom, an anti-scratch treatment 9, a polarizer 10, a layer glue 11, a glass slide 52, an electrode 13, an orientation layer 14, a liquid crystal 15, an orientation layer 53, an electrode 17, a glass slide 19, a layer of glue 20, a polarizer 21, an active area 7 and, laterally positioned around the liquid crystal 15 and between the orientation layers 14 and 53, a strip of adhesive 22. The anti-scratch treatment 9 is carried out on the polarizer 10 in a known manner. The polarizers 10 and 21 are of known type. They are glued to the glass slides 52 and 19 by the adhesive layers 11 and 20. The electrodes 13 and 17 are transparent and of known type and produced on the glass slides 52 and 19. The orientation layers 14 and 53 and the adhesive tape 22 are of known type in the production liquid crystal displays. The liquid crystal 15 is of the nematic helical type with a helix making a quarter of its pitch, that is to say ninety degrees. The orientations of the polarizers and the orientation layers are presented in FIG. 4.
La zone active connexe 7 est la partie connexe la plus grande de la superposition des électrodes 13 et 17.The connected active area 7 is the largest connected part of the superposition of the electrodes 13 and 17.
La figure 3 représente une zone active et des connexions électriques incorporés dans le dispositif présenté en figure 1.FIG. 3 represents an active zone and electrical connections incorporated in the device presented in FIG. 1.
Dans la figure 3 sont représentés le filtre électro¬ optique 5, comportant les électrodes 13 et 17, la zone active 7 entre des parties d'électrodes 26 et 27 et des segments d'électrodes 23, 24 et 25, et les liaisons électriques 4.In FIG. 3 are shown the electro-optical filter 5, comprising the electrodes 13 and 17, the active area 7 between parts of electrodes 26 and 27 and segments of electrodes 23, 24 and 25, and the electrical connections 4 .
L'électrode 13 est constituée des segments 23 et 24, d'une part et de la partie d'électrode 26, d'autre part.The electrode 13 is made up of the segments 23 and 24, on the one hand, and of the electrode part 26, on the other hand.
L'électrode 17 est constituée du segment 25, d'une part, et de la partie d'électrode 27, d'autre part.The electrode 17 consists of the segment 25, on the one hand, and the electrode part 27, on the other hand.
Les parties d'électrodes 26 et 27 se superposent exactement, sont identiques à la zone active connexe 7 et la définissent.The electrode parts 26 and 27 exactly overlap, are identical to the related active area 7 and define it.
La figure 4 représente des polariseurs pouvant s'incorporer dans le dispositif présenté en figure 1.FIG. 4 represents polarizers which can be incorporated in the device presented in FIG. 1.
Dans la figure 4 sont représentées quatre flèches F10, F14, F53 et F21. La flèche F10 représente la direction de polarisation du polariseur 10. La flèche F14 représente la direction d'orientation de la couche d'orientation 14. La flèche F53 représente la direction de la couche d'orientation 53. La flèche F21 représente la direction de polarisation du polariseur 21. Les flèches F14 et F53 sont perpendiculaires, ce qui est connu dans la fabrication des écrans à cristaux liquides nématiques en hélice. La flèche F10 est inclinée vers la gauche et possède avec la flèche F14 un angle de 5 degrés dans le sens trigonométrique. La flèche F21 est inclinée vers le bas et possède avec la flèche F53 un angle de 5 degrés dans le sens opposé au sens trigonométrique. L'angle entre les directions de polarisation des polariseurs 10 et 21 est donc de 100 degrés. Il est à noter que d'autres valeurs d'inclinaisons par rapports aux directions des couches d'orientation sont aussi conformes à l'esprit de l'invention et que les valeurs des angles entre les couches d'orientation et les polariseurs peuvent être différents ou dans le même sens trigonométrique.In Figure 4 are represented four arrows F10, F14, F53 and F21. The arrow F10 represents the direction of polarization of the polarizer 10. The arrow F14 represents the direction of orientation of the orientation layer 14. The arrow F53 represents the direction of the orientation layer 53. The arrow F21 represents the direction of polarization of the polarizer 21. The arrows F14 and F53 are perpendicular, which is known in the manufacture of helical nematic liquid crystal displays. The arrow F10 is inclined to the left and has with the arrow F14 an angle of 5 degrees in the counterclockwise direction. The arrow F21 is inclined downward and has with the arrow F53 an angle of 5 degrees in the direction opposite to the trigonometric direction. The angle between the polarization directions of the polarizers 10 and 21 is therefore 100 degrees. It should be noted that other values of inclinations with respect to the directions of the orientation layers are also in accordance with the spirit of the invention and that the values of the angles between the orientation layers and the polarizers can be different. or in the same trigonometric direction.
La figure 5 représente un schéma-bloc d'un circuit électronique incorporé dans le dispositif présenté en figure 1. Dans la figure 5 sont représentés les filtres électro¬ optiques 5 et 6, les parties d'électrodes 26 et 27 les liaisons électriques 4, une source d'alimentation électrique 28, le capteur photo-sensible 2 et deux oscillateurs 50 et 51. La source d'alimentation électrique 28 peut être constituée d'une pile ou être incorporée au capteur photo¬ sensible 2, sous forme de cellules solaires.FIG. 5 represents a block diagram of an electronic circuit incorporated in the device presented in FIG. 1. In FIG. 5 are shown the electro-optical filters 5 and 6, the parts of electrodes 26 and 27 the electrical connections 4, an electrical power source 28, the photo-sensitive sensor 2 and two oscillators 50 and 51. The electrical power source 28 can consist of a battery or be incorporated into the photo-sensitive sensor 2, in the form of solar cells .
Les oscillateurs électriques 50 et 51 sont reliés - 1 -Electric oscillators 50 and 51 are connected - 1 -
électriquement à la source d'alimentation électrique 28 et au capteur photo-sensible, respectivement, d'une part, et aux électrodes 26 et 27, respectivement, par l'intermédiaire des liaisons électriques 4, d'autre part. Les oscillateurs électriques 50 et 51 délivrent des signaux alternatifs de même amplitude et de même fréquence mais en opposition de phases. De cette manière, les signaux reçus par le cristal liquide 15, entre les parties d'électrodes 26 et 27, possèdent la même fréquence que les signaux émis par les oscillateurs 50 et 51 mais avec une amplitude doublée.electrically to the electric power source 28 and to the photo-sensitive sensor, respectively, on the one hand, and to the electrodes 26 and 27, respectively, via the electrical connections 4, on the other hand. The electric oscillators 50 and 51 deliver alternating signals of the same amplitude and the same frequency but in phase opposition. In this way, the signals received by the liquid crystal 15, between the electrode parts 26 and 27, have the same frequency as the signals emitted by the oscillators 50 and 51 but with a doubled amplitude.
La figure 6 représente un schéma électronique réalisant les fonctions du schéma-bloc présenté en figure 5.FIG. 6 represents an electronic diagram realizing the functions of the block diagram presented in FIG. 5.
Dans la figure 6 sont représentés des cellules solaires 30, un condensateur 31, une résistance 32, une résistance 33, un condensateur 34, un potentiomètre 35, deux transistors 36 et 37, un condensateur 38, quatre triggers de schmit inverseurs 39, 40, 41 et 42 et des liaisons électriques 12 et 16.In FIG. 6 are shown solar cells 30, a capacitor 31, a resistor 32, a resistor 33, a capacitor 34, a potentiometer 35, two transistors 36 and 37, a capacitor 38, four inverting schmit triggers 39, 40, 41 and 42 and electrical connections 12 and 16.
Le potentiomètre 35 contrôle le gain de l'amplificateur à gain variable constitué des deux transistors 36 et 37. Le circuit électronique dont le schéma est doné en figure 6 est d'une compréhension et d'une réalisation aisée pour l'homme de l'art. Sa description n'est donc pas plus détaillée.The potentiometer 35 controls the gain of the variable gain amplifier consisting of the two transistors 36 and 37. The electronic circuit, the diagram of which is given in FIG. 6, is easy to understand and to realize for the man of the art. Its description is therefore not more detailed.
Les liaisons électriques 12 et 16 sont respectivement reliées aux parties d'électrodes 26 et 27 et constituent ainsi les liaisons 4 présentées en figures 1 à 5.The electrical connections 12 and 16 are respectively connected to the electrode portions 26 and 27 and thus constitute the connections 4 presented in FIGS. 1 to 5.
Les cellules solaires 30 constituent le capteur photo¬ sensible 2 et la source d'alimentation électrique 28. Préférentiellement, l'axe de polarisation des polariseurs avant de chacun des écrans électro-optiques 5 et 6 est vertical.The solar cells 30 constitute the photo-sensitive sensor 2 and the electric power source 28. Preferably, the polarization axis of the front polarizers of each of the electro-optical screens 5 and 6 is vertical.
Préférentiellement aussi, la biréfringence du cristal liquide 15 et son épaisseur sont conjointement adaptés au premier minium de la courbe de Gooch et Tarry, leur produit étant sensiblement égal à 500 nm. Also preferably, the birefringence of the liquid crystal 15 and its thickness are jointly adapted to the first minimum of the Gooch and Tarry curve, their product being substantially equal to 500 nm.

Claims

REVENDICATIONS
1/ Dispositif de filtrage de rayons lumineux comportant un capteur photo-sensible (2) adapté à émettre un signal primaire continu de puissance croissante en.fonction de l'intensité lumineuse qui l'atteint, un circuit électronique (3) électriquement relié au capteur photo-sensible (2) et émettant un signal secondaire alternatif de puissance croissante avec la puissance du signal émis par le capteur photo-sensible (2) et deux écrans électro-optiques (5,6) fonctionnant en positif et placés sur une monture de lunetterie (1) et comportant chacun une zone active (7,8), de forme connexe, adaptée à être placée devant un oeil et reliée par des liaisons électriques (4) à la sortie du circuit électronique caractérisé en ce que deux au moins des contacts entre les liaisons électriques (4) avec la zone active connexe sont éloignés entre eux d'une distance supérieure à un quart de la plus grande dimension de la zone active connexe.1 / Light ray filtering device comprising a photo-sensitive sensor (2) adapted to emit a continuous primary signal of increasing power depending on the light intensity which reaches it, an electronic circuit (3) electrically connected to the sensor photo-sensitive (2) and emitting an alternating secondary signal of increasing power with the power of the signal emitted by the photo-sensitive sensor (2) and two electro-optical screens (5,6) operating in positive and placed on a mounting of eyewear (1) and each comprising an active area (7,8), of connected shape, adapted to be placed in front of an eye and connected by electrical connections (4) to the output of the electronic circuit characterized in that at least two of contacts between the electrical connections (4) with the associated active area are distant from each other by a distance greater than a quarter of the largest dimension of the connected active area.
2/ Dispositif selon la revendication 1 caractérisé en ce que les écrans électro-optiques (5,6) sont constitués d'écrans à cristaux liquides comportant des couches d'orientation (14,53) et des polariseurs (10,21), au moins un angle entre une direction (F14,F53) d'une couche d'orientation et une direction (F10,F21) d'un polariseur étant supérieur à deux degrés. 3/ Dispositif selon la revendication 2 caractérisé en ce que le cristal liquide possède un indice de biréfringence et une épaisseur conjointement adaptés au premier minimum de la courbe de Gooch et Tarry, leur produit étant environ égal à 500 nm. 4/ Dispositif selon l'une quelconque des revendications précédentes caractérisé en ce que le circuit électronique (3) comporte deux oscillateurs (50,51) fonctionnant en decallage de phase. 5/ Dispositif selon l'une quelconque des revendications précédentes caractérisé en ce que les directions des polariseurs avant des écrans électro-optique sont sensiblement verticales. 6/ Dispositif selon l'une quelconque des revendications précédentes caractérisé en ce que le circuit électronique comporte un amplificateur à gain variable (36,37) dont le gain est commandé par un potentiomètre (35).2 / Device according to claim 1 characterized in that the electro-optical screens (5,6) consist of liquid crystal screens comprising orientation layers (14,53) and polarizers (10,21), at minus an angle between a direction (F14, F53) of an orientation layer and a direction (F10, F21) of a polarizer being greater than two degrees. 3 / Device according to claim 2 characterized in that the liquid crystal has a birefringence index and a thickness jointly adapted to the first minimum of the Gooch and Tarry curve, their product being approximately equal to 500 nm. 4 / Device according to any one of the preceding claims, characterized in that the electronic circuit (3) comprises two oscillators (50,51) operating in phase stripping. 5 / Device according to any one of the preceding claims, characterized in that the directions of the front polarizers of the electro-optical screens are substantially vertical. 6 / Device according to any one of the preceding claims, characterized in that the electronic circuit comprises a variable gain amplifier (36,37) whose gain is controlled by a potentiometer (35).
7/ Dispositif selon l'une quelconque des revendications précédentes caractérisé en ce que le capteur photo-sensible est un ensemble de cellules solaires (30). 7 / Device according to any one of the preceding claims, characterized in that the photo-sensitive sensor is a set of solar cells (30).
PCT/FR1993/000572 1992-06-26 1993-06-15 Sunglasses having electro-optical screens WO1994000789A1 (en)

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FR9208122 1992-06-26
FR92/08122 1992-06-26

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US5549019A (en) * 1992-08-03 1996-08-27 Marposs S.P.A. Apparatus for the dynamical balancing of a rotating body
WO1998035263A1 (en) * 1997-02-06 1998-08-13 Bausch & Lomb Incorporated Electric connection configuration for electro-optical device
WO2008033292A1 (en) * 2006-09-11 2008-03-20 Alphamicron, Inc. Interconnection tab used with optical devices
US7705959B2 (en) 2001-09-18 2010-04-27 Alphamicron, Inc. Curved optical device and method having a pair of opposed thermoplastic substrates with spacers therebetween to permanently retain a curved shape
US8562130B2 (en) 2006-09-11 2013-10-22 Alphamicron Incorporated Interconnection tab used with optical devices

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WO1987006355A1 (en) * 1986-04-17 1987-10-22 Gregory Edward Lowe Variable density light transmitting device
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US5015086A (en) * 1989-04-17 1991-05-14 Seiko Epson Corporation Electronic sunglasses
US5114218A (en) * 1991-01-11 1992-05-19 Reliant Laser Corp. Liquid crystal sunglasses with selectively color adjustable lenses

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FR2293188A1 (en) * 1974-12-02 1976-07-02 Budmiger Hermann PROTECTIVE FILTER AGAINST LIGHT ESPECIALLY FOR WELDING
FR2530039A1 (en) * 1982-07-06 1984-01-13 Cuvelier Antoine Safety (protective) glasses having automatically adjustable transmission using liquid crystals
US4560239A (en) * 1984-02-29 1985-12-24 Amnon Katz Liquid crystal active light shield
WO1987006018A1 (en) * 1986-03-24 1987-10-08 Daniele Senatore Adjustable transparency spectacles
WO1987006355A1 (en) * 1986-04-17 1987-10-22 Gregory Edward Lowe Variable density light transmitting device
EP0341519A2 (en) * 1988-05-11 1989-11-15 Seiko Epson Corporation Electronic sunglasses
US5015086A (en) * 1989-04-17 1991-05-14 Seiko Epson Corporation Electronic sunglasses
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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5549019A (en) * 1992-08-03 1996-08-27 Marposs S.P.A. Apparatus for the dynamical balancing of a rotating body
WO1998035263A1 (en) * 1997-02-06 1998-08-13 Bausch & Lomb Incorporated Electric connection configuration for electro-optical device
US5980037A (en) * 1997-02-06 1999-11-09 Luxottica Leasing S.P.A. Electric connection configuration for electro-optical device
US7705959B2 (en) 2001-09-18 2010-04-27 Alphamicron, Inc. Curved optical device and method having a pair of opposed thermoplastic substrates with spacers therebetween to permanently retain a curved shape
WO2008033292A1 (en) * 2006-09-11 2008-03-20 Alphamicron, Inc. Interconnection tab used with optical devices
US7936496B2 (en) 2006-09-11 2011-05-03 Alphamicron Incorporated Interconnection tab used with optical devices
US8562130B2 (en) 2006-09-11 2013-10-22 Alphamicron Incorporated Interconnection tab used with optical devices
EP3246747A1 (en) * 2006-09-11 2017-11-22 Alphamicron, Inc. Interconnection tab used with optical devices

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