GB2282459B - Optical system having a biaspheric lens and an aspheric lens - Google Patents

Optical system having a biaspheric lens and an aspheric lens

Info

Publication number
GB2282459B
GB2282459B GB9422928A GB9422928A GB2282459B GB 2282459 B GB2282459 B GB 2282459B GB 9422928 A GB9422928 A GB 9422928A GB 9422928 A GB9422928 A GB 9422928A GB 2282459 B GB2282459 B GB 2282459B
Authority
GB
United Kingdom
Prior art keywords
lens
optical system
biaspheric
aspheric
aspheric lens
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.)
Expired - Fee Related
Application number
GB9422928A
Other versions
GB2282459A (en
GB9422928D0 (en
Inventor
Takayuki Ito
Sachio Hasushita
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.)
Pentax Corp
Original Assignee
Asahi Kogaku Kogyo Co Ltd
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
Priority claimed from JP35542491A external-priority patent/JP3288740B2/en
Priority claimed from JP4227567A external-priority patent/JPH0682694A/en
Priority claimed from JP22756892A external-priority patent/JP3306110B2/en
Application filed by Asahi Kogaku Kogyo Co Ltd filed Critical Asahi Kogaku Kogyo Co Ltd
Priority claimed from GB9224736A external-priority patent/GB2261744B/en
Publication of GB9422928D0 publication Critical patent/GB9422928D0/en
Publication of GB2282459A publication Critical patent/GB2282459A/en
Application granted granted Critical
Publication of GB2282459B publication Critical patent/GB2282459B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B15/00—Optical objectives with means for varying the magnification
    • G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
    • G02B15/16—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group
    • G02B15/177—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a negative front lens or group of lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B15/00—Optical objectives with means for varying the magnification
    • G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
    • G02B15/142—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having two groups only
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B15/00—Optical objectives with means for varying the magnification
    • G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
    • G02B15/142—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having two groups only
    • G02B15/1425—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having two groups only the first group being negative
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B23/00—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices
    • G02B23/14—Viewfinders
    • 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
    • G03B13/00—Viewfinders; Focusing aids for cameras; Means for focusing for cameras; Autofocus systems for cameras
    • G03B13/02—Viewfinders
    • G03B13/10—Viewfinders adjusting viewfinders field
    • G03B13/12—Viewfinders adjusting viewfinders field to compensate for change of camera lens or size of picture
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B23/00—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices
    • G02B23/14—Viewfinders
    • G02B23/145—Zoom viewfinders
GB9422928A 1991-11-25 1992-11-25 Optical system having a biaspheric lens and an aspheric lens Expired - Fee Related GB2282459B (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
JP35542491A JP3288740B2 (en) 1991-11-25 1991-11-25 Real image finder
JP35542391 1991-11-25
JP4227567A JPH0682694A (en) 1992-08-26 1992-08-26 Aspherical lens system
JP22756892A JP3306110B2 (en) 1991-11-25 1992-08-26 Real image type zoom finder
GB9224736A GB2261744B (en) 1991-11-25 1992-11-25 Variable power view finder with aspheric lens surfaces

Publications (3)

Publication Number Publication Date
GB9422928D0 GB9422928D0 (en) 1995-01-04
GB2282459A GB2282459A (en) 1995-04-05
GB2282459B true GB2282459B (en) 1996-07-03

Family

ID=27517161

Family Applications (6)

Application Number Title Priority Date Filing Date
GB9422929A Expired - Fee Related GB2282460B (en) 1991-11-25 1992-11-25 Variable power view finder
GB9422931A Withdrawn GB2283106A (en) 1991-11-25 1992-11-25 Variable power view finder
GB9422927A Withdrawn GB2282458A (en) 1991-11-25 1992-11-25 Variable power view finder
GB9422936A Expired - Fee Related GB2282462B (en) 1991-11-25 1992-11-25 Variable power view finder
GB9422928A Expired - Fee Related GB2282459B (en) 1991-11-25 1992-11-25 Optical system having a biaspheric lens and an aspheric lens
GB9422930A Withdrawn GB2282461A (en) 1991-11-25 1992-11-25 Variable power view finder

Family Applications Before (4)

Application Number Title Priority Date Filing Date
GB9422929A Expired - Fee Related GB2282460B (en) 1991-11-25 1992-11-25 Variable power view finder
GB9422931A Withdrawn GB2283106A (en) 1991-11-25 1992-11-25 Variable power view finder
GB9422927A Withdrawn GB2282458A (en) 1991-11-25 1992-11-25 Variable power view finder
GB9422936A Expired - Fee Related GB2282462B (en) 1991-11-25 1992-11-25 Variable power view finder

Family Applications After (1)

Application Number Title Priority Date Filing Date
GB9422930A Withdrawn GB2282461A (en) 1991-11-25 1992-11-25 Variable power view finder

Country Status (1)

Country Link
GB (6) GB2282460B (en)

Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3778133A (en) * 1972-07-26 1973-12-11 Itek Corp Lens system having at least one thin, highly deformed plate with aspherical surfaces
GB1522356A (en) * 1974-10-18 1978-08-23 Eastman Kodak Co Three element lens
US4109995A (en) * 1976-06-03 1978-08-29 Opcon Associates Of Canada, Ltd. Triplet with aspheric surfaces
EP0105467A1 (en) * 1982-09-30 1984-04-18 Coulter Systems Corporation Synthetic resin lens system
US4733953A (en) * 1985-02-06 1988-03-29 Matsushita Electric Industrial Co., Ltd. Color corrected projection lens
EP0401862A2 (en) * 1989-06-09 1990-12-12 Canon Kabushiki Kaisha Zoom lens of rear focus type
US4981344A (en) * 1988-11-14 1991-01-01 Minolta Camera Kabushiki Kaisha Wide angle lens system for use in copying machine
US5004329A (en) * 1989-07-14 1991-04-02 Olympus Optical Co., Ltd. Vari-focal lens system
GB2241351A (en) * 1990-02-22 1991-08-28 Asahi Optical Co Ltd Zoom finder
EP0473117A1 (en) * 1990-08-29 1992-03-04 Jos. Schneider Optische Werke Kreuznach GmbH & Co. KG High-aperture, wide angle lens
GB2261529A (en) * 1991-05-20 1993-05-19 Eastman Kodak Co A zoom lens
GB2262164A (en) * 1991-11-04 1993-06-09 Eastman Kodak Co Zoom lens having weak front lens group
GB2263345A (en) * 1992-01-14 1993-07-21 Asahi Optical Co Ltd Zoom lens

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4047222A (en) * 1976-01-13 1977-09-06 Optigon Research & Development Corporation Camera viewfinding system
JPS5529833A (en) * 1978-08-22 1980-03-03 Minolta Camera Co Ltd Finder for single-lens reflex camera
JPS5611427A (en) * 1979-07-10 1981-02-04 Canon Inc Variable power afocal lens system
US4592636A (en) * 1984-05-07 1986-06-03 Canon Kabushiki Kaisha View finder optical system
JPS6129816A (en) * 1984-07-23 1986-02-10 Fuji Photo Optical Co Ltd Finder optical system
US4910545A (en) * 1987-09-09 1990-03-20 Canon Kabushiki Kaisha Finder optical system
US4909614A (en) * 1987-11-13 1990-03-20 Canon Kabushiki Kaisha Variable magnification finder
JPH0758368B2 (en) * 1989-01-09 1995-06-21 旭光学工業株式会社 Viewfinder optical system of a single-lens reflex camera using a pentamirror
JPH02304409A (en) * 1989-05-19 1990-12-18 Olympus Optical Co Ltd Finder optical system
JP3164618B2 (en) * 1991-09-26 2001-05-08 旭光学工業株式会社 Real image type zoom finder
EP0564634B1 (en) * 1991-10-28 1996-01-03 Eastman Kodak Company Zoom viewfinder
JPH10257817A (en) * 1997-03-18 1998-09-29 Mitsubishi Agricult Mach Co Ltd Belt clutch device of mobile harvesting maching

Patent Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3778133A (en) * 1972-07-26 1973-12-11 Itek Corp Lens system having at least one thin, highly deformed plate with aspherical surfaces
GB1522356A (en) * 1974-10-18 1978-08-23 Eastman Kodak Co Three element lens
US4109995A (en) * 1976-06-03 1978-08-29 Opcon Associates Of Canada, Ltd. Triplet with aspheric surfaces
EP0105467A1 (en) * 1982-09-30 1984-04-18 Coulter Systems Corporation Synthetic resin lens system
US4733953A (en) * 1985-02-06 1988-03-29 Matsushita Electric Industrial Co., Ltd. Color corrected projection lens
US4981344A (en) * 1988-11-14 1991-01-01 Minolta Camera Kabushiki Kaisha Wide angle lens system for use in copying machine
EP0401862A2 (en) * 1989-06-09 1990-12-12 Canon Kabushiki Kaisha Zoom lens of rear focus type
US5004329A (en) * 1989-07-14 1991-04-02 Olympus Optical Co., Ltd. Vari-focal lens system
GB2241351A (en) * 1990-02-22 1991-08-28 Asahi Optical Co Ltd Zoom finder
EP0473117A1 (en) * 1990-08-29 1992-03-04 Jos. Schneider Optische Werke Kreuznach GmbH & Co. KG High-aperture, wide angle lens
GB2261529A (en) * 1991-05-20 1993-05-19 Eastman Kodak Co A zoom lens
GB2262164A (en) * 1991-11-04 1993-06-09 Eastman Kodak Co Zoom lens having weak front lens group
GB2263345A (en) * 1992-01-14 1993-07-21 Asahi Optical Co Ltd Zoom lens

Also Published As

Publication number Publication date
GB2282460B (en) 1996-07-03
GB2282459A (en) 1995-04-05
GB9422930D0 (en) 1995-01-04
GB2283106A (en) 1995-04-26
GB2282462B (en) 1996-07-03
GB9422936D0 (en) 1995-01-04
GB2282460A (en) 1995-04-05
GB9422929D0 (en) 1995-01-04
GB9422927D0 (en) 1995-01-04
GB2282458A (en) 1995-04-05
GB9422928D0 (en) 1995-01-04
GB2282462A (en) 1995-04-05
GB2282461A (en) 1995-04-05
GB9422931D0 (en) 1995-01-04

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20061125