FR2373804A1 - Compact zoom lens holder - sets focal length and image sharpness by displacing relative distance between front and rear lens groups - Google Patents

Compact zoom lens holder - sets focal length and image sharpness by displacing relative distance between front and rear lens groups

Info

Publication number
FR2373804A1
FR2373804A1 FR7736830A FR7736830A FR2373804A1 FR 2373804 A1 FR2373804 A1 FR 2373804A1 FR 7736830 A FR7736830 A FR 7736830A FR 7736830 A FR7736830 A FR 7736830A FR 2373804 A1 FR2373804 A1 FR 2373804A1
Authority
FR
France
Prior art keywords
focal length
zoom lens
image sharpness
relative distance
lens groups
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.)
Granted
Application number
FR7736830A
Other languages
French (fr)
Other versions
FR2373804B1 (en
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.)
Fujinon Corp
Original Assignee
Fuji Photo Optical 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 JP15795676A external-priority patent/JPS5382371A/en
Application filed by Fuji Photo Optical Co Ltd filed Critical Fuji Photo Optical Co Ltd
Publication of FR2373804A1 publication Critical patent/FR2373804A1/en
Application granted granted Critical
Publication of FR2373804B1 publication Critical patent/FR2373804B1/fr
Granted 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
    • G02B15/22—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 movable lens means specially adapted for focusing at close distances
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
    • G02B7/04—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Lens Barrels (AREA)
  • Lenses (AREA)

Abstract

Zoom lens holder sets focal length and image sharpness for front and rear lens groups. During continuous adjustment of the focal length, the two lens groups are diaplced relative to each other in an axial direction. During focusing only the front lens group is displaced in an axial direction. The holder comprises a number of rings. A fixed ring surrounds the zoon lens system. Its axis of symmetry coincides with the optical axis of the zoom lens system. The ring comprises a wedge-shaped groove which is aligned in an axial direction.
FR7736830A 1976-12-09 1977-12-07 Compact zoom lens holder - sets focal length and image sharpness by displacing relative distance between front and rear lens groups Granted FR2373804A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP16511476 1976-12-09
JP15795676A JPS5382371A (en) 1976-12-28 1976-12-28 Zoom lens barrel permitting close distance photographing

Publications (2)

Publication Number Publication Date
FR2373804A1 true FR2373804A1 (en) 1978-07-07
FR2373804B1 FR2373804B1 (en) 1982-08-06

Family

ID=26485229

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7736830A Granted FR2373804A1 (en) 1976-12-09 1977-12-07 Compact zoom lens holder - sets focal length and image sharpness by displacing relative distance between front and rear lens groups

Country Status (2)

Country Link
DE (2) DE7737467U1 (en)
FR (1) FR2373804A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2637989A1 (en) * 1988-10-15 1990-04-20 Asahi Optical Co Ltd ZOOM LENS ASSEMBLY FOR PHOTOGRAPHIC APPARATUS AND METHOD FOR CONTROLLING LENS ASSEMBLY ZOOM
US5233472A (en) * 1988-10-15 1993-08-03 Asahi Kogaku Kogyo Kabushiki Kaisha Method of controlling a zoom lens assembly
US5434714A (en) * 1989-03-31 1995-07-18 Asahi Kogaku Kogyo Kabushiki Kaisha Zoom lens barrel

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57116309A (en) * 1981-01-12 1982-07-20 Canon Inc Zoom lens barrel
JPS58145902A (en) * 1982-02-25 1983-08-31 Yabe Kogaku Kiki Seisakusho:Kk Rear converter lens with macro function
JPH07119872B2 (en) * 1985-12-02 1995-12-20 旭光学工業株式会社 Zoom lens barrel
DE3730572C2 (en) * 1987-09-11 1996-08-22 Leica Industrieverwaltung Photographic lens

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2141204A1 (en) * 1970-08-18 1972-02-24 Nippon Kogaku K.K., Tokio Varifocal lens for camera
US3752565A (en) * 1972-02-18 1973-08-14 Shima Kogaku Kk Zoom lens apparatus
FR2193986A1 (en) * 1971-11-10 1974-02-22 Mito Hiroshi
US3841735A (en) * 1972-07-17 1974-10-15 Sanko Kogaku Kogyo Kk Zoom lens system operable for extremely short distance photography
US3915557A (en) * 1974-04-19 1975-10-28 Optigon Res & Dev Corp Zoom lens
US4002402A (en) * 1974-02-27 1977-01-11 Hiroshi Mito Lens hood for zoom lenses
FR2331043A1 (en) * 1975-12-19 1977-06-03 Nippon Kogaku Kk LENS MOUNT WITH VARIABLE FOCAL DISTANCE ALLOWING MACROPHOTOGRAPHY

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3059533A (en) * 1959-11-23 1962-10-23 Bell & Howell Co Zoom lens
DE1812964U (en) * 1960-02-12 1960-06-09 Zeiss Carl Fa ADJUSTMENT MOUNT FOR PHOTOGRAPHIC LENSES WITH DISTANCE AND FOCAL LENGTH ADJUSTMENT.
US3784285A (en) * 1972-06-01 1974-01-08 Ponder & Best Zoom lens
US3765748A (en) * 1972-09-01 1973-10-16 H Mito Mechanism for relative adjustment of axially spaced lens components

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2141204A1 (en) * 1970-08-18 1972-02-24 Nippon Kogaku K.K., Tokio Varifocal lens for camera
FR2193986A1 (en) * 1971-11-10 1974-02-22 Mito Hiroshi
US3752565A (en) * 1972-02-18 1973-08-14 Shima Kogaku Kk Zoom lens apparatus
US3841735A (en) * 1972-07-17 1974-10-15 Sanko Kogaku Kogyo Kk Zoom lens system operable for extremely short distance photography
US4002402A (en) * 1974-02-27 1977-01-11 Hiroshi Mito Lens hood for zoom lenses
US3915557A (en) * 1974-04-19 1975-10-28 Optigon Res & Dev Corp Zoom lens
FR2331043A1 (en) * 1975-12-19 1977-06-03 Nippon Kogaku Kk LENS MOUNT WITH VARIABLE FOCAL DISTANCE ALLOWING MACROPHOTOGRAPHY

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2637989A1 (en) * 1988-10-15 1990-04-20 Asahi Optical Co Ltd ZOOM LENS ASSEMBLY FOR PHOTOGRAPHIC APPARATUS AND METHOD FOR CONTROLLING LENS ASSEMBLY ZOOM
US5170294A (en) * 1988-10-15 1992-12-08 Asahi Kogaku Kabushiki Kaisha Method of controlling the zoom lens assembly
US5233472A (en) * 1988-10-15 1993-08-03 Asahi Kogaku Kogyo Kabushiki Kaisha Method of controlling a zoom lens assembly
US5434714A (en) * 1989-03-31 1995-07-18 Asahi Kogaku Kogyo Kabushiki Kaisha Zoom lens barrel
US5450242A (en) * 1989-03-31 1995-09-12 Asahi Kogaku Kogyo Kabushiki Kaisha Zoom lens barrel
US5636063A (en) * 1989-03-31 1997-06-03 Asahi Kogaku Kogyo Kabushiki Kaisha Zoom lens barrel
US5646790A (en) * 1989-03-31 1997-07-08 Asahi Kogaku Kogyo Kabushiki Kaisha Zoom lens barrel

Also Published As

Publication number Publication date
DE7737467U1 (en) 1979-02-08
DE2754713A1 (en) 1978-06-22
FR2373804B1 (en) 1982-08-06
DE2754713C3 (en) 1982-09-30
DE2754713B2 (en) 1979-03-08

Similar Documents

Publication Publication Date Title
GB1477289A (en) Variable focal length lens system
GB1497384A (en) Variable focal length objective
GB1475696A (en) Zoom lens system also capable of ultra-closeup photography
JPS52117126A (en) Telephoto lens system
GB1430311A (en) Telephoto lens systems
GB1451885A (en) Image rotating optical system
FR2373804A1 (en) Compact zoom lens holder - sets focal length and image sharpness by displacing relative distance between front and rear lens groups
JPS559550A (en) Zoom lens system
GB1447586A (en) Zoom lenses
US4017161A (en) Compact zoom lens
JPS5768873A (en) Variable scale factor copying optical device which is capable of magnification and reduction
JPS6472114A (en) Zoom lens
GB1321060A (en) Zoom lens system for extreme closeup photography
JPS5735821A (en) Reverse telephoto lens
JPS5562412A (en) Fixed magnification image pickup device in single operation ring type zoom lens barrel
JPS6431113A (en) Lens for underwater camera
GB1442964A (en) Optical viewing devices
JPS5726816A (en) Wide angle zoom lens system consisting of three components
GB1469291A (en) Zoom lenses
JPS57161824A (en) Zoom lens system
JPS5323645A (en) Zoom lens capable of easy transfer for focal distance range
JPS56165107A (en) Focusing device for zoom lens
JPS53112760A (en) Wide field microscopic objective lens
JPS5729024A (en) Zoom lens system having lens group for focusing behind the system
JPS5245330A (en) Lens barrel for the zoom lens system able for macro shooting

Legal Events

Date Code Title Description
ST Notification of lapse