GB732914A - Improvements in or relating to photometers, more particularly photographic exposure meters - Google Patents

Improvements in or relating to photometers, more particularly photographic exposure meters

Info

Publication number
GB732914A
GB732914A GB959252A GB959252A GB732914A GB 732914 A GB732914 A GB 732914A GB 959252 A GB959252 A GB 959252A GB 959252 A GB959252 A GB 959252A GB 732914 A GB732914 A GB 732914A
Authority
GB
United Kingdom
Prior art keywords
cell
light
hemisphere
translucent
photo
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
GB959252A
Inventor
John Frederick Dunn
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.)
Sangamo Weston Ltd
Atos Origin IT Services Inc
Original Assignee
Sangamo Weston Ltd
Sangamo Weston 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 Sangamo Weston Ltd, Sangamo Weston Inc filed Critical Sangamo Weston Ltd
Priority to GB959252A priority Critical patent/GB732914A/en
Publication of GB732914A publication Critical patent/GB732914A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J1/00—Photometry, e.g. photographic exposure meter
    • G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
    • G01J1/4209—Photoelectric exposure meters for determining the exposure time in recording or reproducing
    • G01J1/4214—Photoelectric exposure meters for determining the exposure time in recording or reproducing specially adapted for view-taking apparatus

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Eye Examination Apparatus (AREA)

Abstract

732,914. Photographic exposure meters. SANGAMO WESTON, Ltd. April 15, 1953 [April 16, 1952], No. 9592/52. Class 98 (1). [Also in Group XL (b)] An incident light photographic exposure meter having a translucent screen shaped convex at the front to receive on its outer surface light falling on the front and sides of the subject, a light-sensitive element illuminated by light issuing from the back of said screen and light-indicating means operated by said element is provided with auxiliary rearwardly facing means for receiving light coming from behind the meter the screen reflecting it to the lightsensitive element thereby taking account of the back lighting of the subject. As shown, the photo-cell 21 connected to a measuring device 17 and provided with a covering translucent hemisphere 16a of larger diameter than the cell and extending beyond the meter casing 19 so that rear light passes through a transparent window 20 closing the segmental opening of the hemisphere. Alternatively the photo-cell is covered by a major translucent segment of a sphere or of an oblate spheroid. In one form using a major segment of a sphere, only the forward-facing hemisphere is translucent and the rear segment is transparent, the photo-cell being disposed in the dividing plane of the portions. In a further embodiment in which the photo-cell is disposed beyond the body of the measuring instrument on an extension of the rear wall, the cell is covered by a translucent hemisphere and is of annular form so that rear light may pass through a window concentric with the cell on to the rear of the hemisphere.
GB959252A 1952-04-16 1952-04-16 Improvements in or relating to photometers, more particularly photographic exposure meters Expired GB732914A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB959252A GB732914A (en) 1952-04-16 1952-04-16 Improvements in or relating to photometers, more particularly photographic exposure meters

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB959252A GB732914A (en) 1952-04-16 1952-04-16 Improvements in or relating to photometers, more particularly photographic exposure meters

Publications (1)

Publication Number Publication Date
GB732914A true GB732914A (en) 1955-06-29

Family

ID=31898121

Family Applications (1)

Application Number Title Priority Date Filing Date
GB959252A Expired GB732914A (en) 1952-04-16 1952-04-16 Improvements in or relating to photometers, more particularly photographic exposure meters

Country Status (1)

Country Link
GB (1) GB732914A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2983186A (en) * 1959-03-10 1961-05-09 Donald W Norwood Device with three dimensional light collector

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2983186A (en) * 1959-03-10 1961-05-09 Donald W Norwood Device with three dimensional light collector

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