GB475203A - Improvements in or relating to photo-electric exposure meters - Google Patents

Improvements in or relating to photo-electric exposure meters

Info

Publication number
GB475203A
GB475203A GB18871/36A GB1887136A GB475203A GB 475203 A GB475203 A GB 475203A GB 18871/36 A GB18871/36 A GB 18871/36A GB 1887136 A GB1887136 A GB 1887136A GB 475203 A GB475203 A GB 475203A
Authority
GB
United Kingdom
Prior art keywords
photo
relating
exposure meters
hood
july
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
GB18871/36A
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.)
Zeiss Ikon AG
Original Assignee
Zeiss Ikon AG
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 Zeiss Ikon AG filed Critical Zeiss Ikon AG
Publication of GB475203A publication Critical patent/GB475203A/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
    • G01J1/02—Details
    • G01J1/04—Optical or mechanical part supplementary adjustable parts
    • G01J1/06—Restricting the angle of incident light
    • 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
    • G01J1/02—Details
    • G01J1/04—Optical or mechanical part supplementary adjustable parts
    • 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
    • G01J1/02—Details
    • G01J1/04—Optical or mechanical part supplementary adjustable parts
    • G01J1/0407—Optical elements not provided otherwise, e.g. manifolds, windows, holograms, gratings
    • 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
    • G01J1/02—Details
    • G01J1/04—Optical or mechanical part supplementary adjustable parts
    • G01J1/0407—Optical elements not provided otherwise, e.g. manifolds, windows, holograms, gratings
    • G01J1/0477—Prisms, wedges

Abstract

475,203. Photographic exposure meters. ZEISS IKON AKT.-GES. July 7, 1936, No. 18871. Convention date, July 10, 1935. Addition to 451,530. [Class 40 (iii)] [Also in Group XX] In place of the prismatic or faceted plate used in the parent Specification, a circular prism mounted in a hood which cuts off the light rays incident at too great an angle, is used. As shown, the prism 1 consists of a glass block having the upper surface plane or concave and the under surface provided with a conical depression, carried in a hood 2 in front of the light-sensitive cell 3.
GB18871/36A 1935-07-10 1936-07-07 Improvements in or relating to photo-electric exposure meters Expired GB475203A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE475203X 1935-07-10

Publications (1)

Publication Number Publication Date
GB475203A true GB475203A (en) 1937-11-16

Family

ID=6541816

Family Applications (1)

Application Number Title Priority Date Filing Date
GB18871/36A Expired GB475203A (en) 1935-07-10 1936-07-07 Improvements in or relating to photo-electric exposure meters

Country Status (2)

Country Link
CH (1) CH196012A (en)
GB (1) GB475203A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3134021A (en) * 1959-08-01 1964-05-19 Zeiss Ikon Ag Photoelectric exposure meters with light ray limiters

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3134021A (en) * 1959-08-01 1964-05-19 Zeiss Ikon Ag Photoelectric exposure meters with light ray limiters

Also Published As

Publication number Publication date
CH196012A (en) 1938-02-28

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