WO2009076788A1 - Wafer stack, integrated optical device and method for fabricating the same - Google Patents
Wafer stack, integrated optical device and method for fabricating the same Download PDFInfo
- Publication number
- WO2009076788A1 WO2009076788A1 PCT/CH2008/000532 CH2008000532W WO2009076788A1 WO 2009076788 A1 WO2009076788 A1 WO 2009076788A1 CH 2008000532 W CH2008000532 W CH 2008000532W WO 2009076788 A1 WO2009076788 A1 WO 2009076788A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- wafer
- sunshade plate
- integrated optical
- wafer stack
- functional elements
- Prior art date
Links
- 230000003287 optical effect Effects 0.000 title claims abstract description 46
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000004519 manufacturing process Methods 0.000 claims description 14
- 239000000463 material Substances 0.000 claims description 9
- 235000012431 wafers Nutrition 0.000 description 58
- 239000000758 substrate Substances 0.000 description 9
- 230000010076 replication Effects 0.000 description 8
- 239000010408 film Substances 0.000 description 6
- 125000006850 spacer group Chemical group 0.000 description 6
- 238000004049 embossing Methods 0.000 description 5
- 238000003384 imaging method Methods 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 2
- 239000003822 epoxy resin Substances 0.000 description 2
- 229920000647 polyepoxide Polymers 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 230000003362 replicative effect Effects 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 239000012780 transparent material Substances 0.000 description 2
- 239000004593 Epoxy Substances 0.000 description 1
- 229910001218 Gallium arsenide Inorganic materials 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 238000003491 array Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000005350 fused silica glass Substances 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
- H01L27/14—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation
- H01L27/144—Devices controlled by radiation
- H01L27/146—Imager structures
- H01L27/14601—Structural or functional details thereof
- H01L27/1462—Coatings
- H01L27/14621—Colour filter arrangements
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
- H01L27/14—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation
- H01L27/144—Devices controlled by radiation
- H01L27/146—Imager structures
- H01L27/14683—Processes or apparatus peculiar to the manufacture or treatment of these devices or parts thereof
- H01L27/14685—Process for coatings or optical elements
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/02—Details
- H01L31/0216—Coatings
- H01L31/02161—Coatings for devices characterised by at least one potential jump barrier or surface barrier
- H01L31/02162—Coatings for devices characterised by at least one potential jump barrier or surface barrier for filtering or shielding light, e.g. multicolour filters for photodetectors
- H01L31/02164—Coatings for devices characterised by at least one potential jump barrier or surface barrier for filtering or shielding light, e.g. multicolour filters for photodetectors for shielding light, e.g. light blocking layers, cold shields for infrared detectors
-
- 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
- Y10T29/49826—Assembling or joining
Definitions
- the invention relates to an optical device for a camera module comprising a baffle that defines a predetermined field of view (FOV) of the image capturing device, while suppressing beam paths coming from points outside this FOV.
- the invention further relates to a wafer scale package representing a plurality of such optical devices, to a baffle array with a plurality of baffles and to methods for manufacturing a plurality of camera modules and for manufacturing a baffle substrate.
- the camera modules are integrated optical devices, which include functional elements such as the image capturing device and the at least one lens stacked together along the general direction of light propagation. These elements are arranged in a predetermined spatial relationship with respect to one another (integrated device) such that further alignment with each other is not needed, leaving only the integrated device as such to be aligned with other systems.
- Wafer-scale replication of lens elements allows the fabrication of several hundreds of generally identical devices with a single step, e.g. a single or double-sided UV- embossing process.
- Replication techniques include injection molding, roller hot embossing, flat-bed hot embossing, UV embossing.
- the surface topology of a master structure is replicated into a thin film of a UV-curable replication material such as an UV curable epoxy resin on top of a substrate.
- the replicated surface topology can be a refractive or a diffractive optically effective structure, or a combination of both.
- a replication tool bearing a plurality of replication sections that are a negative copy of the optical structures to be manufactured is prepared, e.g. from a master.
- the tool is then used to UV-emboss the epoxy resin.
- the master can be a lithographically fabricated structure in fused silica or silicon, a laser or e-beam written structure, a diamond turned structure or any other type of structure.
- the master may also be a submaster produced in a multi stage generation process by replication from a (super) master.
- a substrate or wafer in the meaning used in this text is a disc or a rectangular plate or a plate of any other shape of any dimensionally stable, often transparent material.
- the diameter of a wafer disk is typically between 5 cm and 40 cm, for example between 10 cm and 31 cm. Often it is cylindrical with a diameter of either 2, 4, 6, 8 or 12 inches, one inch being about 2.54 cm.
- the wafer thickness is for example between 0.2 mm and 10 mm, typically between 0.4 mm and 6 mm.
- the substrate is at least partially transparent. Otherwise, the substrate can be nontransparent as well.
- at least one substrate bears electro-optical components, like the image capturing device, and may thus be a silicon or GaAs or other semiconductor based wafer; it may also be a CMOS wafer or a wafer carrying CCD arrays or an array of Position Sensitive Detectors.
- Such integrated optical devices can be manufactured by stacking wafers along the axis corresponding to the direction of the smallest wafer dimension (axial direction).
- the wafers comprise functional elements, like lens elements or image capturing elements, in a well defined spatial arrangement on the wafer.
- a wafer stack comprising a plurality of generally identical integrated optical devices can be formed, wherein the elements of the optical device have a well defined spatial relationship with respect to one another and define a main optical axis of the device.
- spacer means, e.g. a plurality of separated spacers or an interconnected spacer matrix as disclosed in US 2003/0010431 or WO 2004/027880, the wafers can be spaced from one another, and lens elements can also be arranged between the wafers on a wafer surface facing another wafer.
- a sunshade or baffle is an element that defines a field of view (FOV) of the image capturing element by suppressing beam paths coming from points outside this FOV.
- Known baffles consist of a layer of non-transparent material having a given thickness in axial direction and a through-hole for light transmission.
- the through- hole generally defines a cone with a given extent in axial direction through which light can pass.
- the thickness as well as the shape of the side walls of the through hole determines the FOV and the maximum angle (collection angle) under which incident light can pass the baffle and enter the camera module. It is often desired that the collection angle does not exceed a predetermined value.
- baffles have thus a thickness of several 100 ⁇ m (e.g. 100-300 ⁇ m) and side walls of the through hole which are tapered with an angle of 25-35° with respect to the normal direction of the front wall such that an opening with a varying cross section having a diameter in the range of 1-3 mm is formed. This restricts the full angle of the field of view to about 50 to 70°. ⁇
- baffles are normally made as separate parts. They are attached to the integrated camera module only after its complete manufacture, i.e. after the dicing step if a wafer scale manufacturing process is employed. The additional steps of attaching each individual baffle to each individual camera module associated therewith is time-consuming and complicated and thus another disadvantage of known modules and manufacturing processes.
- a further disadvantage is that the optical system, or at least the top lens element or the iris layer, is fully accessible via the through hole. This may lead to damage and contamination.
- the method for providing a sunshade plate is part of a method for fabricating an integrated optical device by creating a wafer stack by stacking at least a top wafer carrying as functional elements a plurality of lenses on at least one further wafer comprising further functional elements, and separating (dicing) the wafer stack into a plurality of integrated optical devices, wherein corresponding functional elements of the top and further wafer are aligned with each other and define a plurality of main optical axes.
- the method for providing a sunshade plate method for providing a sunshade plate as part of an integrated optical device comprises the steps of
- a sunshade plate comprising a plurality of through holes, the through holes being arranged to correspond to the arrangement of the functional elements on the top wafer; • stacking the sunshade plate on the top wafer, with the through holes being aligned with said main optical axes.
- the optical device may comprise an imaging chip, making it an integrated camera module.
- the method comprises the further step of stacking a transparent cover plate on the sunshade plate prior to cutting the wafer stack into individual optical devices.
- the integrated camera module also comprises a protective cover, and the camera module may be installed in a consumer product such as a mobile phone without the need for a protective plate being mounted on the camera or being provided as part of the housing of the consumer product.
- the step of stacking usually includes gluing or bonding the layers being stacked together, e.g. by means of an adhesive.
- the wafer stack constitutes a wafer scale package.
- a single integrated camera module is manufactured from a wafer stack or wafer package by separating (dicing or cutting) said wafer stack into a plurality of integrated camera modules.
- Figure 1 an elevated view of a sunshade plate
- FIGS. 4 and 5 lateral cut-away views of integrated camera modules.
- Figure 1 schematically shows an elevated view of a sunshade plate.
- the sunshade plate 1 is wafer-sized and comprises a plurality of through holes 6, typically arranged in a grid or array.
- the through holes 6 extend from a top surface 11 to a bottom surface 12 of the sunshade plate 1 and preferably are conical in shape.
- Figures 2 and 3 show lateral cut-away views of wafer stacks 8 with a sunshade plate 1.
- a wafer stack 8 comprises, from top to bottom, a sunshade plate 1 stacked on a top wafer 2 carrying functional elements, for example, a first lens 9a and second lens 9b.
- the top wafer 2 may carry only lenses on its top or only on its bottom surface.
- the lenses may be fabricated on the top wafer 2 by means of a replication process, or may be shaped into the top wafer 2 itself.
- the top wafer 2 is stacked on a further wafer 4 from which it may be separated by a spacer wafer 3.
- the further wafer 4 carries, as further functional elements, imaging or camera chips 9c.
- Each camera chip 9c is aligned with a corresponding lens or set of lenses 9a, 9b, thus forming, together with the surrounding structural elements 2, 3, 4 an integrated camera.
- Each such integrated camera or integrated optical device defines a main optical axis 14.
- Figure 3 shows a different embodiment from that of Figure 2, in that it additionally comprises a transparent cover plate 5 stacked on the sunshade plate 1.
- Further embodiments may comprise further layers of e.g. lenses arranged between the top wafer 2 and the further wafer 4.
- the through holes 6 in the sunshade plate 1 comprise side walls 7, typically conical shaped, which are tapered with an angle of 20-40°, preferably 25-35° with respect to the normal direction of the sunshade plate 1 or its top surface 1 1.
- the exact angle is determined according to camera specifications and usually is about 2° more than the camera's field of view.
- the side walls may be vertical or may be tapered in the other direction, i.e. opening up towards the bottom.
- the side walls are not straight, but rounded or chamfered.
- the thickness of the sunshade plate 1 is in the range of 0.1 to 0.5 or 1 millimeters, the width of the top opening of the through hole 6 being ca. 1 to 3 or 5 millimeters, and the width of the bottom opening being e.g. around 0.3 millimeters.
- the sunshade plate 1 is preferably made of an optically intransparent material.
- the manufacturing process for the sunshade plate 1 itself may be molding, stamping, or another replication process.
- material preferably a plastic material such as a thermoplast or an epoxy, with or without filler material, is used.
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Electromagnetism (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Studio Devices (AREA)
- Solid State Image Pick-Up Elements (AREA)
- Lens Barrels (AREA)
- Transforming Light Signals Into Electric Signals (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN2008801270814A CN101971341B (en) | 2007-12-19 | 2008-12-16 | Wafer stack, integrated optical device and method for fabricating the same |
US12/809,362 US8289635B2 (en) | 2007-12-19 | 2008-12-16 | Wafer stack, integrated optical device and method for fabricating the same |
EP08863376A EP2223338A1 (en) | 2007-12-19 | 2008-12-16 | Wafer stack, integrated optical device and method for fabricating the same |
JP2010538308A JP2011507284A (en) | 2007-12-19 | 2008-12-16 | Wafer stack, integrated optical device and method for making the same |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US1480807P | 2007-12-19 | 2007-12-19 | |
US61/014,808 | 2007-12-19 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2009076788A1 true WO2009076788A1 (en) | 2009-06-25 |
Family
ID=40430188
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/CH2008/000532 WO2009076788A1 (en) | 2007-12-19 | 2008-12-16 | Wafer stack, integrated optical device and method for fabricating the same |
Country Status (7)
Country | Link |
---|---|
US (1) | US8289635B2 (en) |
EP (1) | EP2223338A1 (en) |
JP (1) | JP2011507284A (en) |
KR (1) | KR20100106480A (en) |
CN (1) | CN101971341B (en) |
TW (1) | TW200937642A (en) |
WO (1) | WO2009076788A1 (en) |
Cited By (12)
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WO2011156928A2 (en) | 2010-06-14 | 2011-12-22 | Heptagon Oy | Camera, and method of manufacturing a plurality of cameras |
US20130019461A1 (en) * | 2011-07-19 | 2013-01-24 | Heptagon Micro Optics Pte. Ltd. | Opto-electronic modules and methods of manufacturing the same and appliances and devices comprising the same |
WO2013049947A1 (en) * | 2011-10-05 | 2013-04-11 | Hartmut Rudmann | Micro-optical system and method of manufacture thereof |
JP2013531812A (en) * | 2010-06-14 | 2013-08-08 | ヘプタゴン・オサケ・ユキチュア | Method for manufacturing a plurality of optical devices |
US8674305B2 (en) * | 2011-12-20 | 2014-03-18 | Heptagon Micro Optics Pte. Ltd. | Opto-electronic module and devices comprising the same |
WO2014109711A1 (en) * | 2013-01-10 | 2014-07-17 | Heptagon Micro Optics Pte. Ltd. | Opto-electronic modules including features to help reduce stray light and/or optical cross-talk |
EP2784819A3 (en) * | 2013-03-25 | 2014-10-29 | Kabushiki Kaisha Toshiba | Infrared imaging device and infrared imaging module |
WO2015016775A1 (en) * | 2013-07-30 | 2015-02-05 | Heptagon Micro Optics Pte. Ltd. | Optoelectronic modules that have shielding to reduce light leakage or stray light, and fabrication methods for such modules |
EP3024029A1 (en) | 2014-11-19 | 2016-05-25 | ams AG | Semiconductor device comprising an aperture array and method of producing such a semiconductor device |
US10437025B2 (en) | 2015-01-26 | 2019-10-08 | Omnivision Technologies, Inc. | Wafer-level lens packaging methods, and associated lens assemblies and camera modules |
US10455131B2 (en) | 2015-01-26 | 2019-10-22 | Omnivision Technologies, Inc. | Wafer-level methods for packing camera modules, and associated camera modules |
US10886420B2 (en) * | 2016-04-08 | 2021-01-05 | Ams Sensors Singapore Pte. Ltd. | Thin optoelectronic modules with apertures and their manufacture |
Families Citing this family (19)
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CN101872033B (en) * | 2009-04-24 | 2014-04-30 | 鸿富锦精密工业(深圳)有限公司 | Shading sheet array, manufacturing method thereof and lens module array |
CN102045494A (en) * | 2009-10-22 | 2011-05-04 | 国碁电子(中山)有限公司 | Camera module and making method thereof |
WO2012173252A1 (en) * | 2011-06-17 | 2012-12-20 | コニカミノルタアドバンストレイヤー株式会社 | Method for manufacturing wafer lens, wafer lens, method for manufacturing lens unit, and lens unit |
SG11201403240UA (en) * | 2011-12-22 | 2014-07-30 | Heptagon Micro Optics Pte Ltd | Opto-electronic modules, in particular flash modules, and method for manufacturing the same |
KR102208832B1 (en) * | 2012-05-17 | 2021-01-29 | 에이엠에스 센서스 싱가포르 피티이. 리미티드. | Assembly of wafer stacks |
SG11201408451WA (en) | 2012-07-03 | 2015-01-29 | Heptagon Micro Optics Pte Ltd | Use of vacuum chucks to hold a wafer or wafer sub-stack |
US8606057B1 (en) | 2012-11-02 | 2013-12-10 | Heptagon Micro Optics Pte. Ltd. | Opto-electronic modules including electrically conductive connections for integration with an electronic device |
SG11201504456YA (en) * | 2012-12-27 | 2015-07-30 | Heptagon Micro Optics Pte Ltd | Fabrication of optical elements and modules incorporating the same |
US9923008B2 (en) * | 2013-04-12 | 2018-03-20 | Omnivision Technologies, Inc. | Wafer-level array cameras and methods for fabricating the same |
US9746349B2 (en) * | 2013-09-02 | 2017-08-29 | Heptagon Micro Optics Pte. Ltd. | Opto-electronic module including a non-transparent separation member between a light emitting element and a light detecting element |
CN105531829B (en) * | 2013-09-10 | 2018-08-14 | 赫普塔冈微光有限公司 | Compact optical-electric module and manufacturing method for such module |
WO2015050499A1 (en) * | 2013-10-01 | 2015-04-09 | Heptagon Micro Optics Pte. Ltd. | Lens array modules and wafer-level techniques for fabricating the same |
EP3080840B1 (en) * | 2013-12-09 | 2019-05-22 | Heptagon Micro Optics Pte. Ltd. | Modules having multiple optical channels including optical elements at different heights above the optoelectronic devices |
US9121994B2 (en) * | 2013-12-17 | 2015-09-01 | Anteryon Wafer Optics B.V. | Method of fabricating a wafer level optical lens assembly |
US9176261B2 (en) * | 2014-02-17 | 2015-11-03 | Genius Electronic Optical Co., Ltd. | Optical lens assembly, array type lens module and method of making the array type lens module |
US9711552B2 (en) * | 2014-08-19 | 2017-07-18 | Heptagon Micro Optics Pte. Ltd. | Optoelectronic modules having a silicon substrate, and fabrication methods for such modules |
TWI677991B (en) * | 2015-11-04 | 2019-11-21 | 美商豪威科技股份有限公司 | Wafer-level methods for packaging camera modules, and associated camera modules |
JP2018109716A (en) * | 2017-01-05 | 2018-07-12 | ソニーセミコンダクタソリューションズ株式会社 | Lens module, manufacturing method therefor, image capturing device, and electronic device |
US10734184B1 (en) | 2019-06-21 | 2020-08-04 | Elbit Systems Of America, Llc | Wafer scale image intensifier |
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- 2008-12-16 US US12/809,362 patent/US8289635B2/en active Active
- 2008-12-16 WO PCT/CH2008/000532 patent/WO2009076788A1/en active Application Filing
- 2008-12-16 CN CN2008801270814A patent/CN101971341B/en active Active
- 2008-12-16 EP EP08863376A patent/EP2223338A1/en not_active Withdrawn
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Cited By (27)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2011156928A2 (en) | 2010-06-14 | 2011-12-22 | Heptagon Oy | Camera, and method of manufacturing a plurality of cameras |
JP2013531812A (en) * | 2010-06-14 | 2013-08-08 | ヘプタゴン・オサケ・ユキチュア | Method for manufacturing a plurality of optical devices |
US20130019461A1 (en) * | 2011-07-19 | 2013-01-24 | Heptagon Micro Optics Pte. Ltd. | Opto-electronic modules and methods of manufacturing the same and appliances and devices comprising the same |
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JP2011507284A (en) | 2011-03-03 |
TW200937642A (en) | 2009-09-01 |
US8289635B2 (en) | 2012-10-16 |
US20110013292A1 (en) | 2011-01-20 |
CN101971341A (en) | 2011-02-09 |
EP2223338A1 (en) | 2010-09-01 |
CN101971341B (en) | 2012-10-03 |
KR20100106480A (en) | 2010-10-01 |
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