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GB520037A - Improvements in photographic photo-electric exposure meters - Google Patents

Improvements in photographic photo-electric exposure meters

Info

Publication number
GB520037A
GB520037A GB29426/38A GB2942638A GB520037A GB 520037 A GB520037 A GB 520037A GB 29426/38 A GB29426/38 A GB 29426/38A GB 2942638 A GB2942638 A GB 2942638A GB 520037 A GB520037 A GB 520037A
Authority
GB
United Kingdom
Prior art keywords
cover
light
photo
slot
meter
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
GB29426/38A
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.)
Metrawatt AG
Original Assignee
Metrawatt 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 Metrawatt AG filed Critical Metrawatt AG
Publication of GB520037A publication Critical patent/GB520037A/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)
  • Investigating Or Analysing Materials By Optical Means (AREA)
  • Photometry And Measurement Of Optical Pulse Characteristics (AREA)

Abstract

520,037. Photo-electric exposure meters. METRAWATT AKT.-GES. FABRIK ELEKTRISCHER MESSGERATE. Oct. 11, 1938, No. 29426. Convention date, Oct. 11, 1937. [Class 40 (iii)] In a photographic exposure meter having a hinged cover with a light-reflecting coating disposed in front of the photo-element, the meter has at least two measurement ranges brought into operation by moving the cover into one or other of two definite positions exposing different light inlet apertures. As shown, the cover f hinged at p carries a coating g which reflects light admitted through a slot h on to the photo-element a connected to a direct current meter. On rotating the cover the slot h is enlarged to give a different measurement range the position of the cover being fixed by notches. Extraneous light is prevented from reaching the cell by foldable side members connected to the cover. The slot h may be of rectangular, curved or sinusoidal shape. The wall o of the light passage may be reflecting, and a transparent protecting screen may be inserted in the passage. Specification 454,704, [Group XX] is referred to.
GB29426/38A 1937-10-12 1938-10-11 Improvements in photographic photo-electric exposure meters Expired GB520037A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEM139445D DE745437C (en) 1937-10-12 1937-10-12 Photoelectric light meter

Publications (1)

Publication Number Publication Date
GB520037A true GB520037A (en) 1940-04-12

Family

ID=7334320

Family Applications (1)

Application Number Title Priority Date Filing Date
GB29426/38A Expired GB520037A (en) 1937-10-12 1938-10-11 Improvements in photographic photo-electric exposure meters

Country Status (2)

Country Link
DE (1) DE745437C (en)
GB (1) GB520037A (en)

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2064987A (en) * 1934-12-22 1936-12-22 Photo Marketing Corp Photometer

Also Published As

Publication number Publication date
DE745437C (en) 1944-12-01

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