GB1482793A - Automatic focus detector - Google Patents

Automatic focus detector

Info

Publication number
GB1482793A
GB1482793A GB4486674A GB4486674A GB1482793A GB 1482793 A GB1482793 A GB 1482793A GB 4486674 A GB4486674 A GB 4486674A GB 4486674 A GB4486674 A GB 4486674A GB 1482793 A GB1482793 A GB 1482793A
Authority
GB
United Kingdom
Prior art keywords
focus
focal plane
pulse
rays
equal
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
GB4486674A
Other languages
English (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.)
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
Application filed by Asahi Kogaku Kogyo Co Ltd filed Critical Asahi Kogaku Kogyo Co Ltd
Publication of GB1482793A publication Critical patent/GB1482793A/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
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/53—Means for automatic focusing, e.g. to compensate thermal effects
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/28—Systems for automatic generation of focusing signals
    • G02B7/34—Systems for automatic generation of focusing signals using different areas in a pupil plane

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Focusing (AREA)
  • Automatic Focus Adjustment (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)
GB4486674A 1973-10-17 1974-10-16 Automatic focus detector Expired GB1482793A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11657673A JPS5067648A (enrdf_load_stackoverflow) 1973-10-17 1973-10-17

Publications (1)

Publication Number Publication Date
GB1482793A true GB1482793A (en) 1977-08-17

Family

ID=14690522

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4486674A Expired GB1482793A (en) 1973-10-17 1974-10-16 Automatic focus detector

Country Status (4)

Country Link
JP (1) JPS5067648A (enrdf_load_stackoverflow)
DE (1) DE2449538B2 (enrdf_load_stackoverflow)
FR (1) FR2248531B1 (enrdf_load_stackoverflow)
GB (1) GB1482793A (enrdf_load_stackoverflow)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2564215B1 (fr) * 1984-05-09 1987-07-17 Centre Nat Etd Spatiales Dispositif pour detecter et commander la mise au point d'un appareil de prise de vue

Also Published As

Publication number Publication date
DE2449538B2 (de) 1978-05-24
DE2449538C3 (enrdf_load_stackoverflow) 1979-01-25
FR2248531A1 (enrdf_load_stackoverflow) 1975-05-16
JPS5067648A (enrdf_load_stackoverflow) 1975-06-06
DE2449538A1 (de) 1975-04-30
FR2248531B1 (enrdf_load_stackoverflow) 1981-08-07

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Legal Events

Date Code Title Description
PS Patent sealed
746 Register noted 'licences of right' (sect. 46/1977)
PCNP Patent ceased through non-payment of renewal fee