GB783607A - A diaphragm for a photometer, especially a photo-electric exposure meter - Google Patents
A diaphragm for a photometer, especially a photo-electric exposure meterInfo
- 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
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)
- Microscoopes, Condenser (AREA)
- Spectrometry And Color Measurement (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.
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)
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)
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 |
-
0
- NL NLAANVRAGE7510373,A patent/NL186314B/en unknown
- IT IT516249D patent/IT516249A/it unknown
-
1953
- 1953-05-21 DE DEA18057A patent/DE1008017B/en active Pending
-
1954
- 1954-01-20 GB GB176354A patent/GB783607A/en not_active Expired
- 1954-04-21 CH CH325521D patent/CH325521A/en unknown
- 1954-05-14 AT AT183976D patent/AT183976B/en active
- 1954-05-17 FR FR1106713D patent/FR1106713A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
IT516249A (en) | |
CH325521A (en) | 1957-11-15 |
AT183976B (en) | 1955-12-10 |
DE1008017B (en) | 1957-05-09 |
NL186314B (en) | |
FR1106713A (en) | 1955-12-22 |
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