GB1344571A - Reflex photographic cameras - Google Patents

Reflex photographic cameras

Info

Publication number
GB1344571A
GB1344571A GB1344571DA GB1344571A GB 1344571 A GB1344571 A GB 1344571A GB 1344571D A GB1344571D A GB 1344571DA GB 1344571 A GB1344571 A GB 1344571A
Authority
GB
United Kingdom
Prior art keywords
light
photo
guide
reflected
cell
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
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.)
Pentacon GmbH Foto und Feinwerktechnik
Original Assignee
Pentacon Dresden VEB
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 Pentacon Dresden VEB filed Critical Pentacon Dresden VEB
Publication of GB1344571A publication Critical patent/GB1344571A/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
    • G03B19/00—Cameras
    • G03B19/02—Still-picture cameras
    • G03B19/12—Reflex cameras with single objective and a movable reflector or a partly-transmitting mirror
    • 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
    • G03B7/00—Control of exposure by setting shutters, diaphragms or filters, separately or conjointly
    • G03B7/08—Control effected solely on the basis of the response, to the intensity of the light received by the camera, of a built-in light-sensitive device
    • G03B7/099—Arrangement of photoelectric elements in or on the camera
    • G03B7/0993—Arrangement of photoelectric elements in or on the camera in the camera
    • G03B7/0997—Through the lens [TTL] measuring
    • G03B7/09971—Through the lens [TTL] measuring in mirror-reflex cameras
    • G03B7/09972—Through the lens [TTL] measuring in mirror-reflex cameras using the mirror as sensor light reflecting or transmitting member

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Cameras In General (AREA)

Abstract

1344571 Reflex camera with exposure measuring device PENTACON DRESDEN KAMERA-UND KINOWERKE VEB 3 Feb 1972 5202/72 Addition to 1281816 Heading G2A A reflex camera has a photo-electric measuring device in which the light losses are minimised comprising a light guide 4 having one surface integral and parallel with a partially reflective reflex mirror 2 whereby incident light is transmitted through the mirror and reflected out of the light path on to photo-cell 8. The light guide has a first reflecting surface 5 on to which a light flux refracted through the mirror is directed and reflected on to second surface 6 lying at 45 degrees to the axis of the first surface 5. The light flux reflected from the second surface is subsequently total internally reflected towards exit surface 7, the guide being conically formed in this region so as to focus the flux on adjacent photo-cell 8. A further light guide 9 may be placed in front of the photo-cell. At least two further reflecting surfaces may be provided parallel to the first reflecting surface to assist light transmission through the guide Figs.2 and 3 (not shown).
GB1344571D 1972-02-03 1972-02-03 Reflex photographic cameras Expired GB1344571A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB520272 1972-02-03

Publications (1)

Publication Number Publication Date
GB1344571A true GB1344571A (en) 1974-01-23

Family

ID=9791636

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1344571D Expired GB1344571A (en) 1972-02-03 1972-02-03 Reflex photographic cameras

Country Status (1)

Country Link
GB (1) GB1344571A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4053911A (en) * 1974-12-27 1977-10-11 Nippon Kogaku K.K. Light-receiving device for use with the exposure meter in single lens reflex camera
US4174894A (en) * 1975-09-01 1979-11-20 Nippon Kogaku K.K. TTL metering device in a single lens reflex camera

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4053911A (en) * 1974-12-27 1977-10-11 Nippon Kogaku K.K. Light-receiving device for use with the exposure meter in single lens reflex camera
US4174894A (en) * 1975-09-01 1979-11-20 Nippon Kogaku K.K. TTL metering device in a single lens reflex camera

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Legal Events

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