GB459259A - Improvements in exposure regulating means for cameras - Google Patents
Improvements in exposure regulating means for camerasInfo
- Publication number
- GB459259A GB459259A GB4675/36A GB467536A GB459259A GB 459259 A GB459259 A GB 459259A GB 4675/36 A GB4675/36 A GB 4675/36A GB 467536 A GB467536 A GB 467536A GB 459259 A GB459259 A GB 459259A
- Authority
- GB
- United Kingdom
- Prior art keywords
- relay
- illumination
- amplifier
- control
- resistor
- 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
- G03B7/08—Control effected solely on the basis of the response, to the intensity of the light received by the camera, of a built-in light-sensitive device
- G03B7/091—Digital circuits
- G03B7/097—Digital circuits for control of both exposure time and aperture
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Blocking Light For Cameras (AREA)
- Eye Examination Apparatus (AREA)
- Exposure Control For Cameras (AREA)
Abstract
459,259. Electric control systems. RADIO CORPORATION OF AMERICA, 30, Rockefeller Plaza, New York, U.S.A. Feb. 15, 1936, No. 4675. Convention date, March 9, 1935. [Class 40 (i)] [See also Group XX] Automatic photographic exposure control for contrast and illumination is determined by control circuits for the motors actuating light filters. Two photo-electric cells 30, 31 are oppositely connected in the input circuit of an amplifier 32 which supplies current through a further amplifier 33 to a resistor 28 and a polarized relay 34. The potential producing current in the operating coil 35 of the relay 34 is the resultant of the amplifier output potential and the opposed potential drop produced in resistor 28 by the battery 23f. When the contrast in the scene to be photographed varies, the difference in illumination of the photocells 30, 31 varies and the relay 34 is operated to cause the motor 14 to move a light wedge and correct the exposure. Similarly the general illumination is caused to control a further photo-electric cell which regulates in the same way the action of a relay controlling the movement of a variable tint filter.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US802099XA | 1935-03-09 | 1935-03-09 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB459259A true GB459259A (en) | 1937-01-05 |
Family
ID=22155943
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB4675/36A Expired GB459259A (en) | 1935-03-09 | 1936-02-15 | Improvements in exposure regulating means for cameras |
Country Status (3)
| Country | Link |
|---|---|
| DE (1) | DE696442C (en) |
| FR (1) | FR802099A (en) |
| GB (1) | GB459259A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1188931B (en) * | 1957-06-22 | 1965-03-11 | Agfa Ag | Photoelectric device for the automatic control of a diaphragm arranged in the objective beam path of a photographic device |
-
1936
- 1936-02-15 FR FR802099D patent/FR802099A/en not_active Expired
- 1936-02-15 GB GB4675/36A patent/GB459259A/en not_active Expired
- 1936-03-10 DE DE1936R0095744 patent/DE696442C/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| DE696442C (en) | 1940-09-21 |
| FR802099A (en) | 1936-08-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US2421476A (en) | Photoelectric control apparatus for diaphragms | |
| US2179717A (en) | Automatic photographic shutter | |
| US2388609A (en) | Automatic camera-diaphragm adjuster | |
| US3709123A (en) | Flash illumination of photographed object | |
| GB868648A (en) | Improvements in or relating to photographic cameras or shutters | |
| GB1293771A (en) | Improvements relating to exposure control systems for photographic apparatus | |
| US3468228A (en) | Color compensated shutter | |
| US2387466A (en) | Photoelectric exposure control | |
| GB1339622A (en) | Electric shutter control circuit for a single-lens reflex camera | |
| US3205799A (en) | Shutter timing apparatus | |
| GB459259A (en) | Improvements in exposure regulating means for cameras | |
| USRE26627E (en) | Shutter timing apparatus | |
| US2469076A (en) | Photographic printing exposure control method and apparatus | |
| US3340785A (en) | Automatic diaphragm-setting device | |
| GB1311323A (en) | Cameras | |
| GB856110A (en) | Improvements in or relating to photographic and cinematographic cameras | |
| US3673415A (en) | Shutter operating circuit having means to close shutter when light is insufficient | |
| US2935921A (en) | Picture-taking apparatus with automatic and manual exposure regulation | |
| US3585029A (en) | Printing positives from a plurality of color photographic negatives | |
| US3683769A (en) | Automatic flash circuit | |
| US2012821A (en) | Automatic control of artificial illumination | |
| US2898536A (en) | Automatic iris control for television cameras | |
| US3229574A (en) | Method of photographic printing of color records | |
| GB1123579A (en) | Device for automatic regulation of a photographic exposure | |
| US4550997A (en) | Automatic exposure control circuit |