CA2132473A1 - System and Method for Controlling Spot Power in a Raster Output Scanner - Google Patents

System and Method for Controlling Spot Power in a Raster Output Scanner

Info

Publication number
CA2132473A1
CA2132473A1 CA2132473A CA2132473A CA2132473A1 CA 2132473 A1 CA2132473 A1 CA 2132473A1 CA 2132473 A CA2132473 A CA 2132473A CA 2132473 A CA2132473 A CA 2132473A CA 2132473 A1 CA2132473 A1 CA 2132473A1
Authority
CA
Canada
Prior art keywords
power
compensate
cell
amount
drive current
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
CA2132473A
Other languages
French (fr)
Other versions
CA2132473C (en
Inventor
Tibor Fisli
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Xerox Corp
Original Assignee
Xerox Corp
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 Xerox Corp filed Critical Xerox Corp
Publication of CA2132473A1 publication Critical patent/CA2132473A1/en
Application granted granted Critical
Publication of CA2132473C publication Critical patent/CA2132473C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/40—Picture signal circuits
    • H04N1/401—Compensating positionally unequal response of the pick-up or reproducing head
    • H04N1/4015—Compensating positionally unequal response of the pick-up or reproducing head of the reproducing head
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K15/00—Arrangements for producing a permanent visual presentation of the output data, e.g. computer output printers
    • G06K15/02—Arrangements for producing a permanent visual presentation of the output data, e.g. computer output printers using printers
    • G06K15/12—Arrangements for producing a permanent visual presentation of the output data, e.g. computer output printers using printers by photographic printing, e.g. by laser printers
    • G06K15/1204—Arrangements for producing a permanent visual presentation of the output data, e.g. computer output printers using printers by photographic printing, e.g. by laser printers involving the fast moving of an optical beam in the main scanning direction
    • G06K15/1209—Intensity control of the optical beam

Abstract

The present invention is a scanning system and a novel method for compensating for the variations in the output power of the beam from an A-O
cell. The novel method involves varying the amount of drive current through the laser diode in such a fashion as to compensate for the loss of power due to diffraction inefficiencies. The amount of driving current is dependent upon the amount of power desired in the output beam from the A-O cell. The system and method of the present invention sets the output power from the A-O cell to a desired value. As the diffraction efficiency increases at other portions of the scan, the drive current is cut appropriately to compensate for the increased efficiency; thus keeping the output spot power at the desired value. Likewise, as the diffraction efficiency decreases at other portions of the scan, the drive current should be increased to compensate for the decrease in efficiency;
thereby maintaining the desired value.
CA002132473A 1993-11-17 1994-09-20 System and method for controlling spot power in a raster output scanner Expired - Lifetime CA2132473C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US153693 1993-11-17
US08/153,693 US5412501A (en) 1993-11-17 1993-11-17 System for controlling spot power in a raster output scanner

Publications (2)

Publication Number Publication Date
CA2132473A1 true CA2132473A1 (en) 1995-05-18
CA2132473C CA2132473C (en) 1999-11-16

Family

ID=22548330

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002132473A Expired - Lifetime CA2132473C (en) 1993-11-17 1994-09-20 System and method for controlling spot power in a raster output scanner

Country Status (2)

Country Link
US (1) US5412501A (en)
CA (1) CA2132473C (en)

Families Citing this family (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5641954A (en) * 1993-09-09 1997-06-24 The United States Of American As Represented By The Secretary Of The Air Force Programmable delay line using laser diode taps
JP3291906B2 (en) * 1994-04-11 2002-06-17 キヤノン株式会社 Scanning optical device
US5864418A (en) * 1996-08-30 1999-01-26 Bayer Corporation Agfa Division Multi-beam scanner with mechanically moving element for scanning imaging surfaces
US5796511A (en) * 1996-08-30 1998-08-18 Agfa Division, Bayer Corporation Multi-beam scanner with acousto-optic element for scanning imaging surfaces
US5701003A (en) * 1996-10-22 1997-12-23 Computer Identics Corporation Intensity compensated scanning system
US6084706A (en) * 1997-07-09 2000-07-04 Etec Systems, Inc. High efficiency laser pattern generator
US5892610A (en) * 1997-07-10 1999-04-06 Agfa Division--Bayer Corporation Scanning system with error-correcting deflector
US6303986B1 (en) 1998-07-29 2001-10-16 Silicon Light Machines Method of and apparatus for sealing an hermetic lid to a semiconductor die
US6707591B2 (en) 2001-04-10 2004-03-16 Silicon Light Machines Angled illumination for a single order light modulator based projection system
US6747781B2 (en) 2001-06-25 2004-06-08 Silicon Light Machines, Inc. Method, apparatus, and diffuser for reducing laser speckle
US6782205B2 (en) 2001-06-25 2004-08-24 Silicon Light Machines Method and apparatus for dynamic equalization in wavelength division multiplexing
US6829092B2 (en) 2001-08-15 2004-12-07 Silicon Light Machines, Inc. Blazed grating light valve
US6800238B1 (en) 2002-01-15 2004-10-05 Silicon Light Machines, Inc. Method for domain patterning in low coercive field ferroelectrics
US6767751B2 (en) 2002-05-28 2004-07-27 Silicon Light Machines, Inc. Integrated driver process flow
US6728023B1 (en) 2002-05-28 2004-04-27 Silicon Light Machines Optical device arrays with optimized image resolution
US6822797B1 (en) 2002-05-31 2004-11-23 Silicon Light Machines, Inc. Light modulator structure for producing high-contrast operation using zero-order light
US6829258B1 (en) 2002-06-26 2004-12-07 Silicon Light Machines, Inc. Rapidly tunable external cavity laser
US6813059B2 (en) 2002-06-28 2004-11-02 Silicon Light Machines, Inc. Reduced formation of asperities in contact micro-structures
US6801354B1 (en) 2002-08-20 2004-10-05 Silicon Light Machines, Inc. 2-D diffraction grating for substantially eliminating polarization dependent losses
US6712480B1 (en) 2002-09-27 2004-03-30 Silicon Light Machines Controlled curvature of stressed micro-structures
US6806997B1 (en) 2003-02-28 2004-10-19 Silicon Light Machines, Inc. Patterned diffractive light modulator ribbon for PDL reduction
US6829077B1 (en) 2003-02-28 2004-12-07 Silicon Light Machines, Inc. Diffractive light modulator with dynamically rotatable diffraction plane
US8139103B2 (en) * 2006-11-11 2012-03-20 Vuzix Corporation Traveling lens for video display
KR102002490B1 (en) * 2018-03-20 2019-07-23 주식회사 이오테크닉스 Acoustic optical deflector and calibration method for the same

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4170028A (en) * 1977-04-06 1979-10-02 Xerox Corporation Facet tracking in laser scanning
US5151586A (en) * 1990-08-01 1992-09-29 Brother Kogyo Kabushiki Kaisha Scanning exposure device provided with intensity correction to compensate for scan angle
US5208456A (en) * 1991-08-19 1993-05-04 Xerox Corporation Apparatus and system for spot position control in an optical output device employing a variable wavelength light source

Also Published As

Publication number Publication date
US5412501A (en) 1995-05-02
CA2132473C (en) 1999-11-16

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Effective date: 20140922