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WO1992015036A1 - Systeme de lentille - Google Patents

Systeme de lentille Download PDF

Info

Publication number
WO1992015036A1
WO1992015036A1 PCT/GB1992/000299 GB9200299W WO9215036A1 WO 1992015036 A1 WO1992015036 A1 WO 1992015036A1 GB 9200299 W GB9200299 W GB 9200299W WO 9215036 A1 WO9215036 A1 WO 9215036A1
Authority
WO
WIPO (PCT)
Prior art keywords
lens
lens system
spacer
image
image capture
Prior art date
Application number
PCT/GB1992/000299
Other languages
English (en)
Inventor
Thomas David Binnie
Original Assignee
Vlsi Vision Limited
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 Vlsi Vision Limited filed Critical Vlsi Vision Limited
Publication of WO1992015036A1 publication Critical patent/WO1992015036A1/fr
Priority to GB9314125A priority Critical patent/GB2267580B/en

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/16—Optical objectives specially designed for the purposes specified below for use in conjunction with image converters or intensifiers, or for use with projectors, e.g. objectives for projection TV

Definitions

  • the present invention relates to lens systems and in particular to a lens system suitable for substantially direct interfacing with solid state image capture devices.
  • the present invention provides a lens system suitable for substantially direct interfacing with the image sensing surface of a solid state image capture device, which lens system comprises a lens and a spacer in substantially direct contact with each other, said lens and spacer having refractive indices and being dimensioned so as to form an image in a plane at or in direct proximity to a rear face of said spacer element remote from said lens element, from an object, whereby in use of the lens system with said lens system mounted substantially directly on the image sensing surface of the image capture device an optical image may be captured thereby.
  • the lens system may be mounted substantially directly on the image sensing surface of a solid state image capture device to provide a focussed image thereon without the need for any complex positioning means and associated operations during manufacture of image capture systems.
  • suitable securing means e.g. suitable optical grade adhesive between the lens system and the solid state image capture device it will be appreciated that there may be provided image capture systems which are particularly resistant to rough handling which in conventional systems can result in misalignment of the lens system relative to the image capture device in use of such systems.
  • the present invention comprises an image capture system comprising a lens system of the invention mounted substantially directly on the image sensing surface of a said solid state image capture device.
  • substantially direct contact is used to mean that there should not be any signif cant interspace containing low refractive index material such as air i.e. no interspace having a thickness resulting in a significant optical effect.
  • low refractive index material such as air i.e. no interspace having a thickness resulting in a significant optical effect.
  • this should normally be not more than 500 ⁇ m, preferably not more than 100 ⁇ , thick.
  • resin or like material is used between the components adhesively to secure them together and has a refractive index comparable to that of the lens or spacer, it may be considered as an extension of the lens or spacer and thus need not be so restricted in thickness though preferably the thickness thereof should not be excessive and should be more or less similarly restricted.
  • a plano-convex (or possibly plano-concave - see below) lens with a substantially plane spacer for manufacturing convenience and economy but other combinations e.g. a bi-convex lens and a plan-concave spacer, may also be used.
  • a particular advantage of the inventin resides in the possibility of having a complete lens system directly attached to the sensing surface of a solid state image capture device, it will be appreciated that this invention is also applicable to complex lens systems with a plurality of separate lenses or lens system (e.g. where it is desired to hae one lens or lens system movable relative to another), wherein one lens system is attached to the sensing surface and the other part(s) is (are) mounted separately therefrom.
  • a field-flattening lens system comprising a plano-concave lens and spacer attached directly to the sensing surface of a solid state image capture device.
  • the lens system is secured to said image sensing surface by an optical grade adhesive i.e. a substantially transparent optically uniform adhesive.
  • an adhesive having the same refractive index as the lens or if preferred, as a spacer
  • an adhesive having the same refractive index as the spacer there is used between the lens and spacer an adhesive having the same refractive index as the lens (or if preferred, as a spacer) and between the spacer and the sensing surface, an adhesive having the same refractive index as the spacer.
  • the spacer has a higher, most preferably a substantially higher, refractive index than the lens. Where the same refractive index is acceptable for both then it will be appreciated that the spacer could be formed integrally with the lens.
  • the radius (or radii) of curvature of the lens element and its refractive index may be varied through a wide range of values depending on the required performance in terms of depth field, image size, freedom from aberrations etc.
  • solid state image capture devices in the form of photoelectric sensor arrays (wherein photons are used to generate electric current and/or voltage or change electrical properties such as resistance etc.) which have relatively small size image sensing surfaces e.g. in the range from 0.1 to 5 cms across.
  • the lens system should in such cases desirably be formed and arranged to provide a similarly small-sized image. Where a wide angle filed of view is also required (e.g.
  • a lens of relatively short focal length should be used e.g. for a field of view angle of 80 degrees the (maximum) focal length will not normally exceed 1.19 times the image height and for 60 degrees will not normally exceed 1.73 times the (maximum) image height, the (maximum) image height corresponding to half the sensing surface diamater.
  • the use of a high refractive index spacer and the exclusion of any low refractive index material from the optical path significantly decreases aberration due to Petzval Curvature (otherwise known as curvature of field aberration) and limits spherical aberration.
  • the lens system is therefore particularly advantageous in wide field and/or large aperture applications required for low light conditions.
  • Low-dispersion glass such as type BK7 (available from various sources e.g. Schott Glaswerke) is particularly suitable for the lens element.
  • the spacer element may be made of LaKlO glass also readily available.
  • Other materials that may be used for the lens and/or spacer elements comprise plastics materials, although these are generally less preferred in view of their lower resistance to scratching and other damage and the lower refractive indices available. Nevertheless they may be acceptable for certain applications requiring low cost such as consumer door-entry and security cameras.
  • Suitable adhesive materials for use between the spacer and lens elements and between the spacer element and the solid state image capture device include optical grade epoxy resins.
  • aperture stop means are provided between the lens and spacer in order further to limit spherical aberration and reduce coma and astigmatism, in generally known manner.
  • a fixed.-aperture stop providing an f-number in the range from f/2 to f/22.
  • the solid state image capture device comprises an integrated circuit image array sensor such as that disclosed in our earlier International patent application No. PCT/GB90/01452 (publication No. WO 91/04633) which has on-board signal processing means formed and arranged for directly providing a video signal output.
  • integrated circuit image array sensor such as that disclosed in our earlier International patent application No. PCT/GB90/01452 (publication No. WO 91/04633) which has on-board signal processing means formed and arranged for directly providing a video signal output.
  • image capture devices such as CCD, MOS and CID sensors may also be used.
  • the present invention provides a video camera comprising an image capture system of the present invention provided with signal processing means formed and arranged for producing a video signal output.
  • Fig. 1 is a schematic perspective view of a video camera incorporating a lens system of the invention
  • Fig. 2 is a schematic view of the camera of Fig. 1 in use.
  • Fig. 1 shows a miniature video camera 1 comprising a lens system 2 mounted directly onto the image sensing surface 3 of a solid state image capture device in the form of an integrated circuit image array sensor 4.
  • the sensor 4 is mounted in a suitable housing 5 containing a power supply 6 and provided with a video signal output interface 7.
  • the lens system 2 comprises a generally hemispherical lens 8 having a radius of curvature of the order of 0.8 mm, and a cylindrical spacer element 9 of substantially larger diameter (ca. 1.7mm) and a length of 1.59mm, with an aperture stop 10 therebetween.
  • the aperture stop 10 is of metal e.g. steel alloy with a thickness of 0.15mm and an iris diameter of 0.8mm providing an effective lens aperture of f2.0.
  • the aperture opening is filled with clear epoxy resin 11 having a refractive index substantially similar to that of the lens 8 and secures the lens 8 and spacer 9 to each other and to the aperture stop 10.
  • the lens is of low dispersion glass Bk7) having a refractive index n ⁇ j of 1.568 and the spacer is of LaKlO glass which has a higher refractive index n ⁇ of 1.7200. This combination produces low image blur and large image size (ca. 1.4mm image height from central axis).
  • the spacer 9 has a length of around 1.59mm.
  • the abovedescribed lens system has an effective depth of field of from 2.0 cms to Co with a field of view angle of 90° and has an r s blur of around 5 ⁇ m which is within the unit sensor pixel dimensions thereby providing a reasonably good video signal image output from the video signal output connection 7.
  • the spacer element could be a composite element made up of a plurality of plane components.
  • the lens element could also be composite though this would normally be less preferred due to the significantly increased complexity.
  • the various surfaces of the lens system could moreover be provided with diverse coatings for e.g. reducing undesirable reflections and selective filtration of the incident light rays in generally known manner.
  • the image capture device 4 is provided with a signal processing means 12, which conveniently (as noted above) may be in the form of on-board signal processing means in an integrated circuit image array sensor as described in our International Patent Publication No. WO91/04633, and which provides a video signal output at a suitable socket 7.
  • the camera 1 may be coupled by suitable connections 13 to a suitable VDU (visual display unit) 14 and/or a video image recording device 15 for recording on a video image storage medium in the form of a video tape 16, though naturally other suitable media such as discs may also be used.
  • VDU visual display unit

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Transforming Light Signals Into Electric Signals (AREA)
  • Lens Barrels (AREA)

Abstract

Cette invention concerne un système de lentille (2) permettant de diriger sensiblement l'interface avec la surface de détection d'image (3) d'un dispositif à semiconducteurs captant les images (4). Le système de lentille (2) comprend une lentille (8) et une pièce d'écartement (a) se trouvant pratiquement en contact direct l'une avec l'autre. La pièce d'écartement (9) a de préférence un indice de réfraction qui est au moins égal à celui de ladite lentille (8). La lentille (8) et la pièce d'écartement (9) présentent des indices de réfraction et sont dimensionnées de manière à former une image provenant d'un objet dans un plan situé dans le voisinage proche d'une surface arrière de la pièce d'écartement (9) éloignée de l'élément de lentille (8). Lorsqu'on utilise le système de lentille (2) et que ce dernier est monté pratiquement directement sur la surface de détection d'image (3) du dispositif captant les images (4), on peut capter une image optique. Cette invention concerne également un système captant des images comprenant le sytème de lentille de cette invention, ledit dispositif captant les images étant avantageusement pourvu d'un système d'affichage des images vidéo et/ou d'un système d'enregistrement des images vidéo.
PCT/GB1992/000299 1991-02-23 1992-02-20 Systeme de lentille WO1992015036A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9314125A GB2267580B (en) 1991-02-23 1993-07-08 Image capture system

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB919103846A GB9103846D0 (en) 1991-02-23 1991-02-23 Lens system
GB9103846.3 1991-02-23

Publications (1)

Publication Number Publication Date
WO1992015036A1 true WO1992015036A1 (fr) 1992-09-03

Family

ID=10690498

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1992/000299 WO1992015036A1 (fr) 1991-02-23 1992-02-20 Systeme de lentille

Country Status (2)

Country Link
GB (2) GB9103846D0 (fr)
WO (1) WO1992015036A1 (fr)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1993011631A1 (fr) * 1991-12-06 1993-06-10 Vlsi Vision Limited Agencement de detecteurs a semi-conducteurs
US5780834A (en) * 1995-05-15 1998-07-14 Welch Allyn, Inc. Imaging and illumination optics assembly
US5837985A (en) * 1994-05-14 1998-11-17 Welch Allyn, Inc. Optical imaging assembly having improved image sensor orientation
EP1130905A2 (fr) * 2000-02-23 2001-09-05 Mitsubishi Denki Kabushiki Kaisha Dispositif de prise de vue
EP1148716A1 (fr) * 2000-04-07 2001-10-24 Mitsubishi Denki Kabushiki Kaisha Dispositif d'imagerie
WO2003009040A1 (fr) * 2001-07-20 2003-01-30 Michel Sayag Systeme de lentilles couple optiquement a un dispositif de saisie d'images
US6677656B2 (en) 2001-02-12 2004-01-13 Stmicroelectronics S.A. High-capacitance photodiode
US6781169B2 (en) 2001-02-12 2004-08-24 Stmicroelectronics S.A. Photodetector with three transistors
US6950242B2 (en) 2001-07-20 2005-09-27 Michel Sayag Design and fabrication process for a lens system optically coupled to an image-capture device
US6960799B2 (en) 1998-07-28 2005-11-01 Stmicroelectronics A.A. Image sensor with a photodiode array
US6984817B2 (en) * 2001-05-09 2006-01-10 Stmicroelectronic S.A. CMOS-type photodetector for improved charge transfer from the photodetector to a MOS transistor
EP2069851A2 (fr) * 2006-09-14 2009-06-17 Tessera Technologies Hungary Kft. Système d'imagerie avec tolérances d'ensemble assouplies et procédés associés
US7929220B2 (en) 2005-12-21 2011-04-19 Michel Sayag Adjustable apodized lens aperture

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4303322A (en) * 1979-11-29 1981-12-01 Canon Kabushiki Kaisha Electronic image pick-up device for a single-lens reflex camera having an interchangeable finder
JPH02161412A (ja) * 1988-12-15 1990-06-21 Canon Inc テレビカメラの光学系
US4992875A (en) * 1988-07-18 1991-02-12 Minolta Camera Kabushiki Kaisha Still video camera

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3724924A (en) * 1970-12-23 1973-04-03 Comp Generale Electricite Multiple focusing device
DE8302567U1 (de) * 1982-02-01 1993-07-22 Nippon Sheet Glass Co., Ltd., Osaka Plattenlinse
GB2160739A (en) * 1984-06-23 1985-12-24 Mclennan Marine Limited Night vision systems
GB2180954B (en) * 1985-09-27 1989-09-20 Pilkington Perkin Elmer Ltd Improvements in or relating to lenses

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4303322A (en) * 1979-11-29 1981-12-01 Canon Kabushiki Kaisha Electronic image pick-up device for a single-lens reflex camera having an interchangeable finder
US4992875A (en) * 1988-07-18 1991-02-12 Minolta Camera Kabushiki Kaisha Still video camera
JPH02161412A (ja) * 1988-12-15 1990-06-21 Canon Inc テレビカメラの光学系

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2276512A (en) * 1991-12-06 1994-09-28 Vlsi Vision Ltd Solid state sensor arrangement for video camera
GB2276512B (en) * 1991-12-06 1995-03-01 Vlsi Vision Ltd Solid state sensor arrangement for video camera
WO1993011631A1 (fr) * 1991-12-06 1993-06-10 Vlsi Vision Limited Agencement de detecteurs a semi-conducteurs
US5837985A (en) * 1994-05-14 1998-11-17 Welch Allyn, Inc. Optical imaging assembly having improved image sensor orientation
US5780834A (en) * 1995-05-15 1998-07-14 Welch Allyn, Inc. Imaging and illumination optics assembly
US6960799B2 (en) 1998-07-28 2005-11-01 Stmicroelectronics A.A. Image sensor with a photodiode array
EP1130905A2 (fr) * 2000-02-23 2001-09-05 Mitsubishi Denki Kabushiki Kaisha Dispositif de prise de vue
US7084922B2 (en) 2000-02-23 2006-08-01 Mitsubishi Denki Kabushiki Kaisha Pickup device
EP1130905A3 (fr) * 2000-02-23 2001-12-19 Mitsubishi Denki Kabushiki Kaisha Dispositif de prise de vue
EP1148716A1 (fr) * 2000-04-07 2001-10-24 Mitsubishi Denki Kabushiki Kaisha Dispositif d'imagerie
US7110033B2 (en) 2000-04-07 2006-09-19 Mitsubishi Denki Kabushiki Kaisha Imaging device having an imaging element mounted on a substrate
US6677656B2 (en) 2001-02-12 2004-01-13 Stmicroelectronics S.A. High-capacitance photodiode
US6781169B2 (en) 2001-02-12 2004-08-24 Stmicroelectronics S.A. Photodetector with three transistors
US6984817B2 (en) * 2001-05-09 2006-01-10 Stmicroelectronic S.A. CMOS-type photodetector for improved charge transfer from the photodetector to a MOS transistor
US6747805B2 (en) 2001-07-20 2004-06-08 Michel Sayag Design and fabrication process for a lens system optically coupled to an image-capture device
US6950242B2 (en) 2001-07-20 2005-09-27 Michel Sayag Design and fabrication process for a lens system optically coupled to an image-capture device
EP1410089A4 (fr) * 2001-07-20 2005-06-01 Michel Sayag Systeme de lentilles couple optiquement a un dispositif de saisie d'images
EP1410089A1 (fr) * 2001-07-20 2004-04-21 Michel Sayag Systeme de lentilles couple optiquement a un dispositif de saisie d'images
WO2003009040A1 (fr) * 2001-07-20 2003-01-30 Michel Sayag Systeme de lentilles couple optiquement a un dispositif de saisie d'images
US7929220B2 (en) 2005-12-21 2011-04-19 Michel Sayag Adjustable apodized lens aperture
EP2069851A2 (fr) * 2006-09-14 2009-06-17 Tessera Technologies Hungary Kft. Système d'imagerie avec tolérances d'ensemble assouplies et procédés associés
EP2069851A4 (fr) * 2006-09-14 2010-02-24 Tessera Tech Hungary Kft Système d'imagerie avec tolérances d'ensemble assouplies et procédés associés
US8159602B2 (en) 2006-09-14 2012-04-17 DigitalOptics Corporation Europe Limited Imaging system with relaxed assembly tolerances and associated methods

Also Published As

Publication number Publication date
GB9314125D0 (en) 1993-09-22
GB2267580A (en) 1993-12-08
GB2267580B (en) 1994-09-28
GB9103846D0 (en) 1991-04-10

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