GB783607A - A diaphragm for a photometer, especially a photo-electric exposure meter - Google Patents

A diaphragm for a photometer, especially a photo-electric exposure meter

Info

Publication number
GB783607A
GB783607A GB176354A GB176354A GB783607A GB 783607 A GB783607 A GB 783607A GB 176354 A GB176354 A GB 176354A GB 176354 A GB176354 A GB 176354A GB 783607 A GB783607 A GB 783607A
Authority
GB
United Kingdom
Prior art keywords
aperture
plates
plate
area
diaphragm
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
GB176354A
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.)
Agfa Gevaert NV
Original Assignee
Agfa Camera Werk 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 Agfa Camera Werk AG filed Critical Agfa Camera Werk AG
Publication of GB783607A publication Critical patent/GB783607A/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
    • G03B7/04—Control effected by hand adjustment of a member that senses indication of a pointer of a built- in light-sensitive device, e.g. by restoring point to a fixed associated reference mark
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/005—Diaphragms

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Spectrometry And Color Measurement (AREA)
  • Microscoopes, Condenser (AREA)

Abstract

783,607. Diaphragms. AGFA CAMERAWERK AKT-GES. Jan. 20, 1954 [May 21, 1953], No. 1763/54. Class 97(1) A continuously adjustable diaphragm for the light-accepting, aperture of a photometer, especially a photo-electric exposure meter has two or more elements each arranged for angular movement between an open position at an angle to the plane of the diaphragm aperture and a closed position parallel to the plane of the aperture in which closed position the elements overlap and not more than one element closes the aperture completely, and a common control means causes said elements to take up successively their open or closed positions. As shown, the diaphragm comprises three pairs of plates 1, 1<SP>1</SP> each covering an aperture 2 and each plate 1 has an opening 5 of area 1/64 of the area of the aperture while each plate 1<SP>1</SP> has an opening 5' which when both plates are in the closed position uncovers 1/64 of the area of the opening 5. The plates 1, 1<SP>1</SP> are pivoted about axes joining vertical pivots 3 or 3' and slots 12, 12<SP>1</SP> on the pivot arms of the plates engage pins 11, 11<SP>1</SP> on slides 10, 10<SP>1</SP> which are spring-urged against cams 8, 8<SP>1</SP> on a rack-driven shaft 7a, the cam profiles being chosen so that the plates 1<SP>1</SP> are moved to the position shown before the plates 1 are moved to open the diaphragm fully. If desired the openings 5, 5<SP>1</SP> may carry opal glass discs or other lightdiffusing material, while if it is desired to be able to reduce the illumination to zero, each plate 1<SP>1</SP> may be made completely opaque and may entirely cover the aperture 2. Instead of openings in the plates, the plate 1 may be opaque but smaller in area by 1/64 of the area of the aperture 2 while the plate 1<SP>1</SP> is larger than the plate 1 but fails to cover the aperture by 1/64 of the area uncovered by the plate 1 but in this case small changes in the initial movement of the plate 1<SP>1</SP> effect larger changes in aperture than in the arrangement shown. In a further embodiment, the plates may cover the aperture 2 completely but each has a transmission factor of 1/64.
GB176354A 1953-05-21 1954-01-20 A diaphragm for a photometer, especially a photo-electric exposure meter Expired GB783607A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEA18057A DE1008017B (en) 1953-05-21 1953-05-21 Aperture device for photometer

Publications (1)

Publication Number Publication Date
GB783607A true GB783607A (en) 1957-09-25

Family

ID=6924056

Family Applications (1)

Application Number Title Priority Date Filing Date
GB176354A Expired GB783607A (en) 1953-05-21 1954-01-20 A diaphragm for a photometer, especially a photo-electric exposure meter

Country Status (7)

Country Link
AT (1) AT183976B (en)
CH (1) CH325521A (en)
DE (1) DE1008017B (en)
FR (1) FR1106713A (en)
GB (1) GB783607A (en)
IT (1) IT516249A (en)
NL (1) NL186314B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111846954A (en) * 2020-09-02 2020-10-30 钱丹 Variable-pitch material sucking mechanism

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE610294C (en) * 1935-03-07 Gauthier Gmbh A Photographic lens shutter with light meter
DE608427C (en) * 1935-01-23 Gauthier Gmbh A Lens shutter with light meter
DE582033C (en) * 1929-06-09 1933-08-07 Gauthier Gmbh A Photographic lens shutter with light meter
DE704313C (en) * 1935-09-01 1941-03-27 Metrawatt Akt Ges Photoelectric light meter with swiveling measuring range aperture
DE702924C (en) * 1938-07-24 1941-02-25 Fritz Reich Dipl Ing Optical exposure meter on photographic cameras
DE852653C (en) * 1949-09-24 1952-10-16 Egon Fischer Attachment for photographic or cinematographic cameras, preferably for those with a viewfinder lens

Also Published As

Publication number Publication date
FR1106713A (en) 1955-12-22
CH325521A (en) 1957-11-15
IT516249A (en)
DE1008017B (en) 1957-05-09
AT183976B (en) 1955-12-10
NL186314B (en)

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