GB1185051A - Photoelectric Exposure Measuring Devices - Google Patents
Photoelectric Exposure Measuring DevicesInfo
- Publication number
- GB1185051A GB1185051A GB05552/67A GB1555267A GB1185051A GB 1185051 A GB1185051 A GB 1185051A GB 05552/67 A GB05552/67 A GB 05552/67A GB 1555267 A GB1555267 A GB 1555267A GB 1185051 A GB1185051 A GB 1185051A
- Authority
- GB
- United Kingdom
- Prior art keywords
- exposure
- resistance
- light
- setting
- bridge
- 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
- IZUPBVBPLAPZRR-UHFFFAOYSA-N pentachlorophenol Chemical compound OC1=C(Cl)C(Cl)=C(Cl)C(Cl)=C1Cl IZUPBVBPLAPZRR-UHFFFAOYSA-N 0.000 abstract 1
- 230000035945 sensitivity Effects 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
- G03B27/00—Photographic printing apparatus
- G03B27/72—Controlling or varying light intensity, spectral composition, or exposure time in photographic printing apparatus
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Exposure Control For Cameras (AREA)
- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
Abstract
1,185,051. Exposure meters and exposure control devices. PENTACON DRESDEN KAMERAUND KINOWERKE VEB. April 5, 1967, No.15552/67. Heading G2A. A photo-electric light measuring device has at least one resistance attenuation element including first and second terminals and a sliding contact connected to an exposure setting or selecting member of a camera or a meter, a light-sensitive element subject to prevailing light conditions in circuit with the first and second terminals, and indicating means influenced by the light-sensitive element and the position of the sliding contact, such that correct exposure is achieved by adjustment of the setting or selecting member until a required indication dials. A voltage source 1 supplies a bridge circuit the balance of which is indicated by a glavanometer 2. The bridge includes a photo-conductive cell 3, a resistance 4, and a resistance 5 equal in value to the internal resistance of an attenuation element 6 serving as a logarithmic voltage divider. The bridge is balanced by adjustment of the element 6. In another embodiment Fig.2 (not shown) attentuation elements (6, 7 and 8) are provided in respect of exposure time, film sensitivity and diaphragm aperture controls. A switch (9, Fig. 3, not shown), is automatically opened upon attachment of an objective (not shown) to a camera to render attentuation element (8) built into pre-selector diaphragm effective. A lamp (14, Fig. 5, not shown) may replace the galvanometer 2, Fig. 1 to indicate the correct or incorrect setting of the exposure factor combination. The lamp (14) is connected to the attenuation elements (6, 7 and 8) through a trigger circuit (13).
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB05552/67A GB1185051A (en) | 1967-04-05 | 1967-04-05 | Photoelectric Exposure Measuring Devices |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB05552/67A GB1185051A (en) | 1967-04-05 | 1967-04-05 | Photoelectric Exposure Measuring Devices |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1185051A true GB1185051A (en) | 1970-03-18 |
Family
ID=10061176
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB05552/67A Expired GB1185051A (en) | 1967-04-05 | 1967-04-05 | Photoelectric Exposure Measuring Devices |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB1185051A (en) |
-
1967
- 1967-04-05 GB GB05552/67A patent/GB1185051A/en not_active Expired
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US2573729A (en) | System of photoelectric exposure control | |
US3679905A (en) | Electronic shutter device comprising logarithmic-antilogarithmic circuitry | |
US2285761A (en) | Photographic exposure apparatus | |
US3486434A (en) | Lens compensated light measuring system in single lens reflex camera | |
US3147680A (en) | Photographic light measuring device | |
GB1059252A (en) | Improvements relating to methods for calibrating comparison photometers | |
US3343043A (en) | Automatic exposure time control arrangement | |
GB1404323A (en) | Quantized indication arrangement | |
US2667809A (en) | Exposure meter | |
US3731603A (en) | Automatic exposure time control device for cameras | |
US2755704A (en) | Photographic exposure-determining apparatus | |
GB1193123A (en) | Photographic Camera Provided with Exposure Meter | |
US2503768A (en) | Photoelectric exposure meter having a reflector facing the photocell | |
US2222292A (en) | Photoelectric exposure meter | |
US3532035A (en) | Photoelectric photometer | |
GB1034395A (en) | A cinematographic camera and a film-sensitivity control device therefor | |
GB1185051A (en) | Photoelectric Exposure Measuring Devices | |
US2261010A (en) | Measuring device | |
US2016469A (en) | Exposure meter | |
GB1128808A (en) | Improvement in or relating to exposure control apparatus for photomicrography | |
US3582220A (en) | Light contrast meter for measuring the difference between maximum light intensity and immediately incident light intensity or other intensity | |
US3526175A (en) | Photoelectric measuring devices | |
US3829865A (en) | Electric exposure meter with operational function | |
US2379102A (en) | Photoelectric exposure control | |
GB1072349A (en) | A camera flash circuit |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PE | Patent expired |