WO2007143134A2 - Camera module with premolded lens housing and method of manufacture - Google Patents
Camera module with premolded lens housing and method of manufacture Download PDFInfo
- Publication number
- WO2007143134A2 WO2007143134A2 PCT/US2007/013014 US2007013014W WO2007143134A2 WO 2007143134 A2 WO2007143134 A2 WO 2007143134A2 US 2007013014 W US2007013014 W US 2007013014W WO 2007143134 A2 WO2007143134 A2 WO 2007143134A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- circuit substrate
- image capture
- housing
- capture device
- camera module
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B17/00—Details of cameras or camera bodies; Accessories therefor
- G03B17/02—Bodies
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/57—Mechanical or electrical details of cameras or camera modules specially adapted for being embedded in other devices
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L2224/02—Bonding areas; Manufacturing methods related thereto
- H01L2224/04—Structure, shape, material or disposition of the bonding areas prior to the connecting process
- H01L2224/05—Structure, shape, material or disposition of the bonding areas prior to the connecting process of an individual bonding area
- H01L2224/0554—External layer
- H01L2224/0555—Shape
- H01L2224/05552—Shape in top view
- H01L2224/05554—Shape in top view being square
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L2224/42—Wire connectors; Manufacturing methods related thereto
- H01L2224/47—Structure, shape, material or disposition of the wire connectors after the connecting process
- H01L2224/48—Structure, shape, material or disposition of the wire connectors after the connecting process of an individual wire connector
- H01L2224/4805—Shape
- H01L2224/4809—Loop shape
- H01L2224/48091—Arched
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L2224/42—Wire connectors; Manufacturing methods related thereto
- H01L2224/47—Structure, shape, material or disposition of the wire connectors after the connecting process
- H01L2224/48—Structure, shape, material or disposition of the wire connectors after the connecting process of an individual wire connector
- H01L2224/484—Connecting portions
- H01L2224/48463—Connecting portions the connecting portion on the bonding area of the semiconductor or solid-state body being a ball bond
- H01L2224/48464—Connecting portions the connecting portion on the bonding area of the semiconductor or solid-state body being a ball bond the other connecting portion not on the bonding area also being a ball bond, i.e. ball-to-ball
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L2224/42—Wire connectors; Manufacturing methods related thereto
- H01L2224/47—Structure, shape, material or disposition of the wire connectors after the connecting process
- H01L2224/49—Structure, shape, material or disposition of the wire connectors after the connecting process of a plurality of wire connectors
- H01L2224/491—Disposition
- H01L2224/4912—Layout
- H01L2224/49175—Parallel arrangements
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49002—Electrical device making
Definitions
- the present invention relates generally to digital cameras, and more particularly to digital camera modules that can be mounted in host electronic devices. Even more particularly, the present invention relates to a process for manufacturing a digital camera module that substantially reduces potential damage to an image capture device during the manufacturing the digital camera or digital camera module.
- Digital camera modules are currently being incorporated into a variety of electronic devices. Such camera hosting devices include, but are not limited to, cellular telephones, personal digital assistants (PDAs), and computer cams.
- PDAs personal digital assistants
- the demand for digital camera modules continues to grow as the ability to incorporate the camera modules into host devices expands. Therefore, one design goal of digital camera modules is to make them as small as possible so that they will fit into an electronic device without substantially increasing the overall size of the device. Furthermore, it is also desirable to manufacture such digital camera modules as efficiently and robustly as possible. Means for achieving these design goals must, of course, preserve the quality of the image captured by the camera modules.
- digital camera modules include a lens unit, a housing, a circuit substrate, and a solid-state image capture device.
- the image capture device Upon assembly, the image capture device is electrically connected to the circuit substrate via a plurality of wire bonds or the like.
- the circuit substrate is then fixed to the bottom of the housing or the housing is mounted on the circuit substrate.
- housings of this type are fabricated (e.g., by injection molding) separately before they are coupled to circuit substrates.
- the housing After the housing is formed, it is fixed to the circuit substrate by some suitable means such as an adhesive, thermal weld, post/aperture engagement, etc.
- the lens unit is then adjustably mounted to the opposite end of the housing so that images can be focused onto the image capture device.
- the image capture devices are very sensitive, which is a disadvantage in terms of manufacturing time, cost, quality, and yield of the camera module.
- the image capture device is extremely vulnerable to damage and contamination, particularly before and during the housing attach process. For example, before the housing is attached to the circuit substrate, the wire bonds are exposed to inadvertent contact (e.g., during handling), which can cause damage. Further, the image capture device is vulnerable to contamination from particulate debris caused by the housing attach process. Contamination of the sensor array will block light and cause visible artifacts in every image captured by the device. Obviously, damaged image capture devices causes a decrease in product yield and an increase in labor and material costs.
- the present invention overcomes the problems associated with the prior art by providing a digital camera module and a method of manufacturing the camera module, wherein the housing is mounted to the circuit substrate before the image capture device is mounted to the circuit substrate. Mounting the housing onto the circuit substrate before mounting the image capture device onto the circuit substrate prevents the image capture device from being damaged during the housing attachment process. In addition, having the housing attached to the circuit substrate provides a more robust substrate to mount the image capture device on.
- the digital camera module includes a circuit substrate, a lens housing mounted on the circuit substrate and an image capture device that is mounted on the circuit substrate. The structure and/or location of the lens housing allows the image capture device to be attached after the housing is mounted on the circuit substrate.
- the housing is formed on the circuit substrate via a molding process. Alternatively, the housing is formed separately and attached to the circuit substrate as a component part.
- the structure of the housing facilitates the later mounting of the image capture device.
- the housing includes a bore with a diameter that is larger than a diagonal of the image capture device, so the image capture device can be mounted through the bore.
- the position of the housing facilitates the later mounting of the image capture device.
- the housing is fixed to one surface (e.g., the top) of the circuit substrate and the image capture device is mounted to the opposite surface (e.g., the bottom) of the circuit substrate.
- the circuit substrate defines an aperture and the image capture device is mounted so that light passing through the aperture impinges on a light sensitive portion of the image capture device.
- a method of manufacturing a camera module includes the steps of providing an image capture device, providing a circuit substrate, mounting a housing on the circuit substrate, and mounting the image capture device on the circuit substrate after the housing is mounted on the circuit substrate.
- the housing is molded directly on the circuit substrate.
- the housing is preformed before it is mounted to the circuit substrate.
- the image capture device is flip-chip mounted.
- This particular method includes mounting the housing on a first surface (e.g., top) of the circuit substrate and mounting the image capture device on an opposite (e.g., bottom) surface of the circuit substrate.
- the image capture device is mounted so that a light sensitive portion of the image capture device faces through an aperture in the circuit substrate.
- image capture device is mounted through an opening in the housing.
- the image capture device can be mounted through a bore in the housing that is adapted to receive a lens unit.
- FIG. 1 is a perspective view of a camera module fixed to a host printed circuit board
- FIG. 2 is a perspective view of an array of lens housings formed on a circuit substrate sheet
- FIG. 3 is an exploded view of the camera module of FIG. 1;
- FIG.4 is a cross-sectional view of the camera module of FIG. 1;
- FIG. 5 is a top view of a portion the camera module of FIG. 1 ;
- FIG. 6 is an exploded view of an alternate camera module
- FIG. 7 is a cross-sectional view of the alternate camera module of FIG. 6.
- FIG. 8 is a flow chart summarizing a method for manufacturing camera modules. DETAILED DESCRIPTION
- the present invention overcomes the problems associated with the prior art, by providing a system and method for manufacturing a digital camera module, wherein a housing adapted to hold a lens unit is mounted on a substrate prior to mounting an image capture device on the substrate.
- a housing adapted to hold a lens unit is mounted on a substrate prior to mounting an image capture device on the substrate.
- numerous specific details are set forth (e.g., example lens housing structure, etc.) in order to provide a thorough understanding of the invention. Those skilled in the art will recognize, however, that the invention may be practiced apart from, these specific details.
- details of well known camera module manufacturing practices e.g., assembly, circuit fabrication, molding processes,, focusing means, etc.
- components have been omitted, so as not to unnecessarily obscure the present invention.
- FIG. 1 is a perspective view of a camera module 100 according to one embodiment of the present invention.
- Camera module 100 is shown mounted on a portion of a printed circuit board (PCB) 102 that represents a PCB of a host device (remainder of host device not shown), and communicates electronically with other components of the host device via a plurality of electronic traces 104.
- Devices 106 represent electronic components (e.g., passive devices, etc.) that are mounted on circuit substrate 102.
- PCB 102, traces 104, and devices 106 are representational in character only.
- Camera module 100 includes an image capture device 108 (not visible in the view of FIG. 1 ), a circuit substrate 110, a housing 1 12, and a lens unit 114. Camera module 100 is mounted on PCB 102 via electrical contacts (not visible) on the bottom of circuit substrate 110, which make electrical contact with traces 104. Image capture device 108 is mounted on the top of circuit substrate 110 within housing 112.
- housing 112 defines a cylindrical wall that extends upwardly from circuit substrate 110 and defines an opening for receiving and supporting lens unit 114.
- Lens unit 114 is disposed within the top opening of housing 112, and is adjustably mounted therein by some suitable means (e.g., threads, ramps, etc.) so as to focus an image onto image capture device 108.
- the focusing means is not shown in detail, because it is not particularly relevant to the present invention.
- Fig. 2 shows a perspective view of an array of housings 112 (16 in this example) formed on a circuit substrate sheet 116.
- housings 112 are all formed at the same time directly onto unitary circuit substrate sheet 116 via a molding process.
- housings 112 can be pre-fabricated and attached to circuit substrate sheet 116 via an adhesive or any other suitable means.
- the housing should be formed from a material (e.g., a thermosetting resin) that can withstand the subsequent process (e.g., soldering, wirebonding, etc.) for attaching image capture device 108 to circuit substrate 110.
- substrate sheet 116 includes a plurality of individual camera module circuit substrates 110, each with a respective one of housings 112 attached thereto.
- the individual circuit substrates 110 can be separated by some suitable means (e.g., sawing, scoring, etc.) either before or after the image capture devices 108 are mounted thereon.
- assembling camera modules 100 prior to dividing substrate sheet 116 provides certain advantages including, but not limited, reduced manufacturing time and protecting image capture devices 108 (Fig. 3) from debris generated by the separation process.
- the array dimensions e.g., 4x4 array of housings
- the array could include a single strip of housings in a row or any other convenient layout.
- Fig. 3 is an exploded view of a representative one of camera modules 100, which are assembled on substrate sheet 116.
- conventional camera modules are manufactured by coupling image capture device 108 to circuit substrate 110 before the housing attach process
- camera module 100 is assembled by attaching image capture devices 108 to circuit substrate 110 after housings 112 are formed on circuit substrate sheet 116.
- This method is particularly advantageous, because it minimizes the risks of damaging or contaminating image capture devices 108 during the process of attaching housing 112 to circuit substrate 110.
- attaching is understood to include and means of joining housing 112 with substrate 110, including, but not limited to, forming or molding housing 112 directly on circuit substrate 110 and attaching a preformed housing 112 to circuit substrate 110.
- each image capture device 108 (Fig. 3) is mounted through the central opening of one of housings 112, mechanically fixed (e.g., by an adhesive) to the associated circuit substrate 110, and electrically coupled to the circuitry of circuit substrate 110.
- Circuit substrate 110 includes a top surface 118 whereon a plurality of electrical contacts 120 are formed. Contacts 120 facilitate the electrical connection between image capture device 108 and the circuitry of circuit substrate 110.
- Image capture device 108 includes a corresponding set of electrical contacts 122 that are electrically coupled to contacts 120 by some suitable means (e.g., wire bonding shown in Fig. 4). It should be noted that contacts 122 need not be formed on the upper surface of image capture device 108 in order to provide for a sufficient electrical connection to circuit substrate 110.
- image capture device 108 can include a plurality of contacts formed on it's rear surface such that image capture device 108 can be electrically coupled to corresponding contacts 122 of circuit substrate 110 via a solder process, thereby mechanically and electrically coupling image capture device 108 to circuit substrate 112 in a single process.
- Image capture device 108 further includes an image capture surface 124 on which images are focused by lens unit 114. What ever particular process is used, image capture device 108 should be mounted so that surface 124 remains substantially perpendicular to optical axis 200, so that surface 124 will lie in the focal plane of lens unit 114.
- a lens unit 114 is positioned in each housing 112.
- the position of lens unit 114 within housing 112 is adjustable to facilitate the focusing of lens unit 114 with respect to image capture device 108.
- Housing 112 defines a bore 126 that accepts lens barrel 128 of lens unit 114 and facilitates the rotation of lens unit 114 about optical axis 200.
- Various mechanical adjustment means are known in the art that convert the rotational motion of lens unit 114 into translational motion along optical axis 200. However, no particular adjustment mechanism is shown, because the details of the adjustment mechanism, or even the inclusion of a focus mechanism, are not particularly relevant to the present invention.
- Lens unit 114 further includes a flange 130 that limits the vertical displacement of lens unit 114 with respect to housing 112 so that lens unit cannot contact and damage image capture device 108.
- Fig.4 shows a cross-sectional view of fully assembled camera module 100.
- Contacts 120 of circuit substrate 110 are electrically coupled to corresponding contacts 122 of image capture device 108 via a plurality of wire bonds 132.
- Lens unit 114 is shown to include a plurality of lenses 134 and an optical filter 136 (e.g., an infrared filter). The details of lens unit 114 and the particular optical elements contained therein are not particularly relevant to the present invention.
- Fig. 5 is a top view of camera module 100 with lens unit 114 removed. Note that the diameter of bore 126 is greater than the diagonal of image capture device 108 so that image capture device 108 can be mounted to circuit substrate 110 after housing 114 is formed thereon. Optionally, the diameter of bore 126 can be nearly the same size as the diagonal of image capture device 108 to provide an easy means for positioning image capture 108.
- Fig 6. is an exploded view of an alternative camera module 600 including an image capture device 602, a circuit substrate 604, a housing 606, and a lens unit 608.
- circuit substrate 604 includes an aperture 610 that allows light to travel through a portion of circuit substrate 604. Aperture 610 is large enough to allow lens unit 608 to focus an image onto image capture surface 612 of image capture device 602, through aperture 610.
- image capture device 602 is flip-chip bonded to the bottom surface of substrate 604 after housing 606 is formed/mounted on substrate 604. In this flip- chip bonding method, electrical contacts 614 of image capture device 602 are bonded to electrical contacts (not shown) on the bottom surface of circuit substrate 604. Except as explained below, the structure and assembly of housing 606 and lens unit 608 are substantially the same as housing 112 and lens unit 114, respectively, as described above.
- Mount image capture device 602 to the bottom surface of circuit substrate 602 provides several advantages. For example, because image capture device 602 is not mounted through bore 616 (as in camera module 100), housing 606 and lens unit 608 can be significantly smaller. Note that the diameter of bore 616 is only slightly larger than aperture 610, which is about the same size as image capture surface 612. Thus, the overall footprint of camera module 600 is significantly reduced. Another advantage is that even though housing 606 is attached to circuit substrate 604 prior to attaching image capture device 602, housing 606 does not get in the way when attaching image capture device 602. In fact, housing 606 provides extra support for circuit substrate 604 during the attachment of image capture device 602, thereby making the attachment process more efficient and more reliable.
- Fig. 7 shows a cross-sectional side view of camera module 600.
- circuit substrate 604 includes a plurality of conductive traces 700 formed on the rear surface. Traces 700 provide contacts for electrically connecting image capture device 602 to circuit substrate 604 and also for electrically connecting circuit substrate 604, and thus image capture device 602, to another device such as host device PCB (Fig. 1).
- connections between contacts 614 of image capture device 602 and traces 700 of circuit substrate 604 are made by gold-stud-bump, thermocompression bonding.
- a plurality of bumps 702 e.g., au stud bumps
- Image capture device 602 is then positioned on circuit substrate 604 so that the gold bumps 702 contact traces 700.
- bonded connections are formed between gold bumps 702 and traces 700 and contacts 614 by applying heat and pressure.
- nonconductive paste (NCP) 706 can be applied between image capture device 602 and circuit substrate 604 as part of the bonding process to further strengthen the bonded connections.
- NCP nonconductive paste
- Fig. 8 is a flow chart summarizing one method for manufacturing a camera module according to the present invention.
- a circuit substrate is provided.
- an image capture device is provided in a second step 804.
- a lens unit is provided in a third step 806, a lens unit is provided.
- a lens housing is mounted on the circuit substrate.
- the term "mount” includes, but is not limited to, forming a housing directly on the circuit substrate (e.g., via a molding process) as well as attaching a preformed housing.
- the image capture device is mounted to the circuit substrate after the housing has been mounted.
- the lens unit is coupled to the housing.
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA2654422A CA2654422C (en) | 2006-05-31 | 2007-05-31 | Camera module with premolded lens housing and method of manufacture |
CN2007800265424A CN101490786B (en) | 2006-05-31 | 2007-05-31 | Camera module with premolded lens housing and method of manufacture |
JP2009513308A JP4981129B2 (en) | 2006-05-31 | 2007-05-31 | Camera module with pre-formed lens housing and method for manufacturing the same |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/444,277 | 2006-05-31 | ||
US11/444,277 US8092102B2 (en) | 2006-05-31 | 2006-05-31 | Camera module with premolded lens housing and method of manufacture |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2007143134A2 true WO2007143134A2 (en) | 2007-12-13 |
WO2007143134A3 WO2007143134A3 (en) | 2008-10-30 |
Family
ID=38789011
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2007/013014 WO2007143134A2 (en) | 2006-05-31 | 2007-05-31 | Camera module with premolded lens housing and method of manufacture |
Country Status (5)
Country | Link |
---|---|
US (2) | US8092102B2 (en) |
JP (1) | JP4981129B2 (en) |
CN (1) | CN101490786B (en) |
CA (1) | CA2654422C (en) |
WO (1) | WO2007143134A2 (en) |
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Also Published As
Publication number | Publication date |
---|---|
US8092102B2 (en) | 2012-01-10 |
CN101490786B (en) | 2013-05-08 |
CA2654422A1 (en) | 2007-12-13 |
US20070278394A1 (en) | 2007-12-06 |
WO2007143134A3 (en) | 2008-10-30 |
CN101490786A (en) | 2009-07-22 |
JP2009539325A (en) | 2009-11-12 |
JP4981129B2 (en) | 2012-07-18 |
US20110299848A1 (en) | 2011-12-08 |
CA2654422C (en) | 2015-08-11 |
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