GB1244736A - Exposure control means - Google Patents
Exposure control meansInfo
- Publication number
- GB1244736A GB1244736A GB4433468A GB4433468A GB1244736A GB 1244736 A GB1244736 A GB 1244736A GB 4433468 A GB4433468 A GB 4433468A GB 4433468 A GB4433468 A GB 4433468A GB 1244736 A GB1244736 A GB 1244736A
- Authority
- GB
- United Kingdom
- Prior art keywords
- photo
- cell
- transistor
- transducer
- exposure control
- 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
- 239000004020 conductor Substances 0.000 abstract 1
- 230000001419 dependent effect Effects 0.000 abstract 1
- 230000005669 field effect Effects 0.000 abstract 1
- 238000005286 illumination Methods 0.000 abstract 1
- 230000005855 radiation Effects 0.000 abstract 1
- 238000010079 rubber tapping Methods 0.000 abstract 1
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
-
- 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
- G03B7/081—Analogue circuits
- G03B7/083—Analogue circuits for control of exposure time
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Exposure Control For Cameras (AREA)
Abstract
1,244,736. Exposure control. EASTMAN KODAK CO. Sept. 18, 1968 [Sept. 18, 1967], No. 44334/68. Heading G2A. An exposure control circuit has a transducer 3 for controlling the diaphragm aperture according to the intensity of the lighting of an object area viewed by a photo-sensitive cell 2, and a shunt 6 connected across the transducer having a resistance dependent upon the output of the cell to control the flow of current through the transducer so that the latter regulates the admission of radiation to the medium in accordance with the logarithm of the illumination on the photo-cell. The shunt 3 is preferably a transistor, the base 6b being connected via a variable resistance 10 to a variable tapping 7 of a potentiometer 5. The transducer 3, which may be part of a galvanometer arrangement, is connected to the photosensitive cell through amplifying transistor 4, alternatively transistor 4 may be omitted, Fig. 2 (not shown). The photo-sensitive cell may be a photo-conductor as shown, or it may be a photo-voltaic cell, photo-diode, photo-transistor or a photo-sensitive field effect transistor. Vacuum tubes may be used in place of transistors.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US66849867A | 1967-09-18 | 1967-09-18 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1244736A true GB1244736A (en) | 1971-09-02 |
Family
ID=24682536
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB4433468A Expired GB1244736A (en) | 1967-09-18 | 1968-09-18 | Exposure control means |
Country Status (2)
| Country | Link |
|---|---|
| FR (1) | FR1579828A (en) |
| GB (1) | GB1244736A (en) |
-
1968
- 1968-09-10 FR FR1579828D patent/FR1579828A/fr not_active Expired
- 1968-09-18 GB GB4433468A patent/GB1244736A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| DE1797325A1 (en) | 1970-12-17 |
| FR1579828A (en) | 1969-08-29 |
| DE1797325B2 (en) | 1971-07-22 |
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