GB2282460B - Variable power view finder - Google Patents

Variable power view finder

Info

Publication number
GB2282460B
GB2282460B GB9422929A GB9422929A GB2282460B GB 2282460 B GB2282460 B GB 2282460B GB 9422929 A GB9422929 A GB 9422929A GB 9422929 A GB9422929 A GB 9422929A GB 2282460 B GB2282460 B GB 2282460B
Authority
GB
United Kingdom
Prior art keywords
variable power
view finder
power view
finder
variable
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
GB9422929A
Other versions
GB9422929D0 (en
GB2282460A (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 GB9422929D0 publication Critical patent/GB9422929D0/en
Publication of GB2282460A publication Critical patent/GB2282460A/en
Application granted granted Critical
Publication of GB2282460B publication Critical patent/GB2282460B/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

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
  • Astronomy & Astrophysics (AREA)
  • Lenses (AREA)
GB9422929A 1991-11-25 1992-11-25 Variable power view finder Expired - Fee Related GB2282460B (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
GB9422929D0 GB9422929D0 (en) 1995-01-04
GB2282460A GB2282460A (en) 1995-04-05
GB2282460B true GB2282460B (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
GB9422930A Withdrawn GB2282461A (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
GB9422931A Withdrawn GB2283106A (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
GB9422927A Withdrawn GB2282458A (en) 1991-11-25 1992-11-25 Variable power view finder

Family Applications After (5)

Application Number Title Priority Date Filing Date
GB9422930A Withdrawn GB2282461A (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
GB9422931A Withdrawn GB2283106A (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
GB9422927A Withdrawn GB2282458A (en) 1991-11-25 1992-11-25 Variable power view finder

Country Status (1)

Country Link
GB (6) GB2282460B (en)

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1558833A (en) * 1976-01-13 1980-01-09 Vivitar Corp Camera viewfinding systems
US4212526A (en) * 1978-08-22 1980-07-15 Minolta Camera Kabushiki Kaisha Viewfinder for single lens reflex camera
US4427268A (en) * 1979-07-10 1984-01-24 Canon Kabushiki Kaisha Variable magnification ratio lens
US4592636A (en) * 1984-05-07 1986-06-03 Canon Kabushiki Kaisha View finder optical system
US4614409A (en) * 1984-07-23 1986-09-30 Fuji Photo Optical Co., Ltd. Finder optical system
US4909614A (en) * 1987-11-13 1990-03-20 Canon Kabushiki Kaisha Variable magnification finder
US4910545A (en) * 1987-09-09 1990-03-20 Canon Kabushiki Kaisha Finder optical system
GB2227104A (en) * 1989-01-09 1990-07-18 Asahi Optical Co Ltd Optical system for use with a viewfinder
US5034763A (en) * 1989-05-19 1991-07-23 Olympus Optical Co., Ltd. Viewfinder optical system
GB2260202A (en) * 1991-09-26 1993-04-07 Asahi Optical Co Ltd Real-image variable magnification finder

Family Cites Families (15)

* 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
US3944337A (en) * 1974-10-18 1976-03-16 Eastman Kodak Company Three element objective lens with ellipsoidal, hyperbolic, and parabolic surfaces
US4109995A (en) * 1976-06-03 1978-08-29 Opcon Associates Of Canada, Ltd. Triplet with aspheric surfaces
US4561730A (en) * 1982-09-30 1985-12-31 Coulter Systems Corporation Synthetic resin lens system for imaging apparatus
JPH0629899B2 (en) * 1985-02-06 1994-04-20 松下電器産業株式会社 Projection lens
US4981344A (en) * 1988-11-14 1991-01-01 Minolta Camera Kabushiki Kaisha Wide angle lens system for use in copying machine
US5134524A (en) * 1989-06-09 1992-07-28 Canon Kabushiki Kaisha Rear focus type zoom lens
JP2579215B2 (en) * 1989-07-14 1997-02-05 オリンパス光学工業株式会社 Zoom lens
US5191477A (en) * 1990-02-22 1993-03-02 Asahi Kogaku Kogyo Kabushiki Kaisha Zoom finder
DE4128435A1 (en) * 1990-08-29 1992-03-05 Schneider Co Optische Werke HIGHLY OPENED WIDE-ANGLE LENS
US5268792A (en) * 1991-05-20 1993-12-07 Eastman Kodak Company Zoom lens
JPH06504147A (en) * 1991-10-28 1994-05-12 イーストマン・コダック・カンパニー zoom viewfinder
US5315440A (en) * 1991-11-04 1994-05-24 Eastman Kodak Company Zoom lens having weak front lens group
JPH05188293A (en) * 1992-01-14 1993-07-30 Asahi Optical Co Ltd Zoom lens
JPH10257817A (en) * 1997-03-18 1998-09-29 Mitsubishi Agricult Mach Co Ltd Belt clutch device of mobile harvesting maching

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1558833A (en) * 1976-01-13 1980-01-09 Vivitar Corp Camera viewfinding systems
US4212526A (en) * 1978-08-22 1980-07-15 Minolta Camera Kabushiki Kaisha Viewfinder for single lens reflex camera
US4427268A (en) * 1979-07-10 1984-01-24 Canon Kabushiki Kaisha Variable magnification ratio lens
US4592636A (en) * 1984-05-07 1986-06-03 Canon Kabushiki Kaisha View finder optical system
US4614409A (en) * 1984-07-23 1986-09-30 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
GB2227104A (en) * 1989-01-09 1990-07-18 Asahi Optical Co Ltd Optical system for use with a viewfinder
US5034763A (en) * 1989-05-19 1991-07-23 Olympus Optical Co., Ltd. Viewfinder optical system
GB2260202A (en) * 1991-09-26 1993-04-07 Asahi Optical Co Ltd Real-image variable magnification finder

Also Published As

Publication number Publication date
GB9422929D0 (en) 1995-01-04
GB9422928D0 (en) 1995-01-04
GB2282459A (en) 1995-04-05
GB9422930D0 (en) 1995-01-04
GB9422931D0 (en) 1995-01-04
GB2282459B (en) 1996-07-03
GB2282462A (en) 1995-04-05
GB9422927D0 (en) 1995-01-04
GB9422936D0 (en) 1995-01-04
GB2282462B (en) 1996-07-03
GB2282460A (en) 1995-04-05
GB2282461A (en) 1995-04-05
GB2283106A (en) 1995-04-26
GB2282458A (en) 1995-04-05

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Legal Events

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

Effective date: 20061125