GB439224A - Improvements in or relating to photo-electric exposure meters and attachments therefor - Google Patents

Improvements in or relating to photo-electric exposure meters and attachments therefor

Info

Publication number
GB439224A
GB439224A GB12785/35A GB1278535A GB439224A GB 439224 A GB439224 A GB 439224A GB 12785/35 A GB12785/35 A GB 12785/35A GB 1278535 A GB1278535 A GB 1278535A GB 439224 A GB439224 A GB 439224A
Authority
GB
United Kingdom
Prior art keywords
photo
relating
tube
exposure meters
exposure
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
GB12785/35A
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 GB439224A publication Critical patent/GB439224A/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
    • G01J1/0437—Optical elements not provided otherwise, e.g. manifolds, windows, holograms, gratings using masks, aperture plates, spatial light modulators, spatial filters, e.g. reflective filters

Abstract

439,224. Photographic exposure meters. ZEISS IKON AKT.-GES., 72, Schandauerstrasse, Dresden, Germany. April 29, 1935, No. 12785. Convention date, April 28, 1934. [Class 98 (i)] A photo-electric exposure - meter is provided with means compensating for the variation of illumination due to variation of the picture angle of the exposure meter. As shown in Fig. 2, a tube a fixing the picture angle of the photo-electric cell b at alpha is provided with a mask c. As shown in Fig. 6 the tube e has a lens d of suitable aperture. As shown in Fig. 10 the tube f has a resistance g of suitable value.
GB12785/35A 1934-04-28 1935-04-29 Improvements in or relating to photo-electric exposure meters and attachments therefor Expired GB439224A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE439224X 1934-04-28

Publications (1)

Publication Number Publication Date
GB439224A true GB439224A (en) 1935-12-02

Family

ID=6507275

Family Applications (1)

Application Number Title Priority Date Filing Date
GB12785/35A Expired GB439224A (en) 1934-04-28 1935-04-29 Improvements in or relating to photo-electric exposure meters and attachments therefor

Country Status (1)

Country Link
GB (1) GB439224A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE748255C (en) * 1939-06-13 1953-02-09 August Abel Electric light meter
US2926562A (en) * 1956-05-11 1960-03-01 Rollei Werke Franke Heidecke Plural range masking means for photoelectric measuring instruments
DE1235023B (en) * 1962-11-07 1967-02-23 Zeiss Ikon Ag Photoelectric light measuring device
EP0520973A1 (en) * 1991-06-27 1992-12-30 Financiere Des Applications De L'electricite S.A. Method and apparatus for measuring the luminance

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE748255C (en) * 1939-06-13 1953-02-09 August Abel Electric light meter
US2926562A (en) * 1956-05-11 1960-03-01 Rollei Werke Franke Heidecke Plural range masking means for photoelectric measuring instruments
DE1235023B (en) * 1962-11-07 1967-02-23 Zeiss Ikon Ag Photoelectric light measuring device
EP0520973A1 (en) * 1991-06-27 1992-12-30 Financiere Des Applications De L'electricite S.A. Method and apparatus for measuring the luminance
BE1004985A3 (en) * 1991-06-27 1993-03-09 Financ Applic Elec Luminance measurement method and apparatus for implementing the method.
US5323226A (en) * 1991-06-27 1994-06-21 Financiere Des Applications De L'electricity S.A. Method of measuring light levels and device for implementing this method

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