GB1194814A - Improvements in or relating to Cameras - Google Patents

Improvements in or relating to Cameras

Info

Publication number
GB1194814A
GB1194814A GB948969A GB948969A GB1194814A GB 1194814 A GB1194814 A GB 1194814A GB 948969 A GB948969 A GB 948969A GB 948969 A GB948969 A GB 948969A GB 1194814 A GB1194814 A GB 1194814A
Authority
GB
United Kingdom
Prior art keywords
light
photo
received
cells
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
GB948969A
Inventor
Norman L Stauffer
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.)
Honeywell Inc
Original Assignee
Honeywell 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
Application filed by Honeywell Inc filed Critical Honeywell Inc
Publication of GB1194814A publication Critical patent/GB1194814A/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)
  • Exposure Control For Cameras (AREA)
  • Photometry And Measurement Of Optical Pulse Characteristics (AREA)

Abstract

1,194,814. Photographic exposure control. HONEYWELL Inc. Feb. 21, 1969 [Feb. 23, 1968], No.9489/69. Heading G2A. Light received through the objective lens of a camera is detected by two photo-cells, one being responsive to light from the whole image area, and the other to light from a part only of this area, and either cell can be connected to a meter by means of a change-over switch. The embodiment shown is a single lens reflex camera, the light received through the lens system 1 being reflected by the mirror 5 up through the focusing screen 12 into a pentaprism 14. This has two emergent faces, 14b and 14c. Behind face 14b is a collector lens 15 acting as a light path restricting means, so that the light passing therethrough is limited to that from a small circular area 16 on the screen 12, this being received by a first photo-cell 21. Behind face 14c is a further pair of collector lenses 23a, 23b, which collect light from the whole of the image area of screen 12, this being received by photo-cells 24a, 24b connected in series. Positioned between photo-cells 24a, 24b is an eyepiece lens 22, through which the whole area to be photographed can be viewed on the screen 12, and the central spot 16 identified. As shown, a change-over switch 31 can connect either cell 21 or the pair of cells 24a, 24b into the circuit of a meter 32, so that an exposure determination may be made based on the light received from the spot 16 only, or on light received from the entire image area.
GB948969A 1968-02-23 1969-02-21 Improvements in or relating to Cameras Expired GB1194814A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US70764768A 1968-02-23 1968-02-23

Publications (1)

Publication Number Publication Date
GB1194814A true GB1194814A (en) 1970-06-10

Family

ID=24842553

Family Applications (1)

Application Number Title Priority Date Filing Date
GB948969A Expired GB1194814A (en) 1968-02-23 1969-02-21 Improvements in or relating to Cameras

Country Status (2)

Country Link
DE (1) DE1908642A1 (en)
GB (1) GB1194814A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2320584A (en) * 1996-12-20 1998-06-24 Asahi Optical Co Ltd Prism with part recessed rear face for viewfinder

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1466125B1 (en) * 1965-09-24 1969-11-06 Hopt Kg R & E Pushbutton assembly for actuating voting units
DE2201092C3 (en) * 1972-01-11 1981-05-21 Ernst Leitz Wetzlar Gmbh, 6330 Wetzlar Device for determining the relative position of the plane of maximum amplitude of a spatial frequency

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2320584A (en) * 1996-12-20 1998-06-24 Asahi Optical Co Ltd Prism with part recessed rear face for viewfinder
GB2320584B (en) * 1996-12-20 2001-06-06 Asahi Optical Co Ltd Prism with part recessed rear face for viewfinder
DE19756567B4 (en) * 1996-12-20 2005-03-24 Pentax Corp. prism

Also Published As

Publication number Publication date
DE1908642A1 (en) 1969-09-25

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees