GB2065919B - Focussing screen - Google Patents

Focussing screen

Info

Publication number
GB2065919B
GB2065919B GB8035647A GB8035647A GB2065919B GB 2065919 B GB2065919 B GB 2065919B GB 8035647 A GB8035647 A GB 8035647A GB 8035647 A GB8035647 A GB 8035647A GB 2065919 B GB2065919 B GB 2065919B
Authority
GB
United Kingdom
Prior art keywords
focussing screen
focussing
screen
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
Application number
GB8035647A
Other versions
GB2065919A (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.)
Canon Inc
Original Assignee
Canon Inc
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 JP14397179A external-priority patent/JPS5667822A/en
Priority claimed from JP15257580A external-priority patent/JPS5774731A/en
Application filed by Canon Inc filed Critical Canon Inc
Publication of GB2065919A publication Critical patent/GB2065919A/en
Application granted granted Critical
Publication of GB2065919B publication Critical patent/GB2065919B/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • G03B13/18—Focusing aids
    • G03B13/24—Focusing screens
    • G03B13/28—Image-splitting devices

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Viewfinders (AREA)
  • Diffracting Gratings Or Hologram Optical Elements (AREA)
GB8035647A 1979-11-07 1980-11-06 Focussing screen Expired GB2065919B (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP14397179A JPS5667822A (en) 1979-11-07 1979-11-07 Focal diaphragm
JP15257580A JPS5774731A (en) 1980-10-29 1980-10-29 Focal plane

Publications (2)

Publication Number Publication Date
GB2065919A GB2065919A (en) 1981-07-01
GB2065919B true GB2065919B (en) 1984-10-17

Family

ID=26475533

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8035647A Expired GB2065919B (en) 1979-11-07 1980-11-06 Focussing screen

Country Status (2)

Country Link
DE (1) DE3041969A1 (en)
GB (1) GB2065919B (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0293126A1 (en) * 1987-05-20 1988-11-30 Keeler Limited Photocoagulation apparatus
EP0602992B1 (en) * 1992-12-18 1999-03-03 Raytheon Company Grating-prism combination
JP3817162B2 (en) * 2001-11-13 2006-08-30 アルプス電気株式会社 Diffraction grating member and manufacturing method thereof
JP4332855B2 (en) * 2005-06-07 2009-09-16 住友電気工業株式会社 Diffraction beam homogenizer optical system using wedges.

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1208179B (en) * 1960-07-09 1965-12-30 Zeiss Carl Fa Viewfinder range finder for photographic and cinematographic cameras
DE1472641C3 (en) * 1965-02-08 1975-11-13 Elbe-Kamera-Gmbh, X 8017 Dresden Focusing screen with biprisms, especially for cameras
DE1267966B (en) * 1967-07-12 1968-05-09 Rollei Werke Franke Heidecke Fresnel field lens for single lens reflex cameras
DE1622126B2 (en) * 1968-02-03 1973-04-26 Jenoptik Jena GmbH, χ 6900 Jena ADJUSTING DISC WITH GRID-LIKE STRUCTURES, ESPECIALLY FOR CAMERAS
DE1797216A1 (en) * 1968-08-30 1971-07-29 Agfa Gevaert Ag Distance adjustment device

Also Published As

Publication number Publication date
GB2065919A (en) 1981-07-01
DE3041969A1 (en) 1981-05-21
DE3041969C2 (en) 1991-05-02

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Legal Events

Date Code Title Description
PE20 Patent expired after termination of 20 years

Effective date: 20001105