GB454296A - Improvements in means for determining the correct exposure in photographic apparatus - Google Patents
Improvements in means for determining the correct exposure in photographic apparatusInfo
- Publication number
- GB454296A GB454296A GB14275/36A GB1427536A GB454296A GB 454296 A GB454296 A GB 454296A GB 14275/36 A GB14275/36 A GB 14275/36A GB 1427536 A GB1427536 A GB 1427536A GB 454296 A GB454296 A GB 454296A
- Authority
- GB
- United Kingdom
- Prior art keywords
- diaphragm
- photo
- ring
- cell
- variable
- 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
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Exposure Control For Cameras (AREA)
Abstract
454,296. Photographic exposure meters. RISZDORFER, O., 1, Gellerthegy utca, Ungarn, Budapest. March 18, 1935, No. 14275/36. Convention date, March 16, 1934. Divided out of 453,845. [Class 98 (i)] Exposure determining means comprises an iris diaphragm arranged in front of a photoelectric cell and positively coupled to means for controlling one of the variable factors of the exposure, e.g. the camera diaphragm, and a variable electrical resistance included in the circuit of the photo-electric cell influenced in accordance with another variable factor, e.g. the shutter speed. As shown, the adjustment ring 18 of the diaphragm 17 is coupled by toothed segments 21, 22 to the adjustment ring 20 of the diaphragm 19 of the photo-cell. The circuit of the photo-cell includes an oscillating coil 24 having a pointer 25, and an adjustable resistance 26, the moving contact 27 of which is connected with the speed setting device 28. The variables are adjusted to bring the pointer 25 to a fixed mark 29. Other factors may be taken into account by additional resistances or by the use of variable diaphragms or light filters. In a modification (not shown), other factors are taken into account by making the diaphragm ring of the photo cell removable, so that it can be taken out and reset in accordance with the scale graduated in Scheiner. degrees or other suitable units. Specification 411,814 is referred to. The Specification as open to inspection under Sect. 91 comprises also, as shown in Fig. 2 (Cancelled), a diaphragm for the photocell 30 made of laminations 31, each having one end connected to a rotatable ring 32, and the other to a rotatable ring 33, the rings 32, 33 being connected by toothed segments to the camera diaphragm 34 and speed setting ring 36 respectively. This subject-matter does not appear in the Specification as accepted.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
HU454296X | 1934-03-16 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB454296A true GB454296A (en) | 1936-09-18 |
Family
ID=10979216
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB14275/36A Expired GB454296A (en) | 1934-03-16 | 1935-03-18 | Improvements in means for determining the correct exposure in photographic apparatus |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB454296A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1060619B (en) * | 1955-10-27 | 1959-07-02 | Voigtlaender A G | Photoelectric light meter |
DE1072823B (en) * | 1960-01-07 | Voigttländer A.G., Braunschwesig | Device for bundling light for light measurements | |
DE1147770B (en) * | 1956-01-30 | 1963-04-25 | Voigtlaender Ag | Photoelectric measuring device, especially intended for photographic purposes, for measuring light intensity or color temperature |
-
1935
- 1935-03-18 GB GB14275/36A patent/GB454296A/en not_active Expired
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1072823B (en) * | 1960-01-07 | Voigttländer A.G., Braunschwesig | Device for bundling light for light measurements | |
DE1060619B (en) * | 1955-10-27 | 1959-07-02 | Voigtlaender A G | Photoelectric light meter |
DE1147770B (en) * | 1956-01-30 | 1963-04-25 | Voigtlaender Ag | Photoelectric measuring device, especially intended for photographic purposes, for measuring light intensity or color temperature |
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