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GB1209729A - Improvements in and relating to optical exposure arrangements - Google Patents

Improvements in and relating to optical exposure arrangements

Info

Publication number
GB1209729A
GB1209729A GB4038069A GB4038069A GB1209729A GB 1209729 A GB1209729 A GB 1209729A GB 4038069 A GB4038069 A GB 4038069A GB 4038069 A GB4038069 A GB 4038069A GB 1209729 A GB1209729 A GB 1209729A
Authority
GB
United Kingdom
Prior art keywords
light
photo
electric
prism
elements
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
GB4038069A
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.)
Ricoh Co Ltd
Original Assignee
Ricoh 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 Ricoh Co Ltd filed Critical Ricoh Co Ltd
Publication of GB1209729A publication Critical patent/GB1209729A/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
    • 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
    • G03B7/09976—Through the lens [TTL] measuring in mirror-reflex cameras the sensor being mounted in, before, or behind the porro-prism

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Photometry And Measurement Of Optical Pulse Characteristics (AREA)
  • Viewfinders (AREA)

Abstract

1,209,729. Photo-electric exposure arrangements; view-finders. RICOH K. K. Aug. 13, 1969 [Aug. 19, 1968], No.40380/69. Heading G2A. An exposure arrangement comprises a viewfinder which has a penta prism or penta roof reflecting mirror 1 having a light inlet 1a and a light outlet 1c, first photo-electric means 4 mounted adjacent the light outlet and directed to receive only light passing through a predetermined part of the light inlet, second photo-electric means 5 mounted adjacent the light outlet and arranged to receive light reflected by a final reflecting surface 1b of the prism or mirror, and an electric circuit selectively responsive to the output of the first or the second photo-electric means whereby to give respectively a selective or an average light exposure indication. The second photoelectric means consists of two elements arranged on either side of a view-finder eye-piece 2. In the case of a prism a slanting surface (1ca) Fig.3 (not shown) is provided against element 4 to obviate light losses by reflection and refraction. A condenser or lattice may be positioned in front of the photo-electric elements to increase the intensity of light received by the elements.
GB4038069A 1968-08-19 1969-08-13 Improvements in and relating to optical exposure arrangements Expired GB1209729A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7143468 1968-08-19

Publications (1)

Publication Number Publication Date
GB1209729A true GB1209729A (en) 1970-10-21

Family

ID=13460407

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4038069A Expired GB1209729A (en) 1968-08-19 1969-08-13 Improvements in and relating to optical exposure arrangements

Country Status (2)

Country Link
DE (1) DE1942186A1 (en)
GB (1) GB1209729A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19756567B4 (en) * 1996-12-20 2005-03-24 Pentax Corp. prism

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19756567B4 (en) * 1996-12-20 2005-03-24 Pentax Corp. prism

Also Published As

Publication number Publication date
DE1942186A1 (en) 1970-04-02

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Legal Events

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