GB522919A - Improvements in photographic photo-electric exposure meters - Google Patents
Improvements in photographic photo-electric exposure metersInfo
- Publication number
- GB522919A GB522919A GB37136/38A GB3713638A GB522919A GB 522919 A GB522919 A GB 522919A GB 37136/38 A GB37136/38 A GB 37136/38A GB 3713638 A GB3713638 A GB 3713638A GB 522919 A GB522919 A GB 522919A
- Authority
- GB
- United Kingdom
- Prior art keywords
- yoke
- moving
- coil
- shoes
- pole
- 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
- 239000000839 emulsion Substances 0.000 abstract 2
- 230000035945 sensitivity Effects 0.000 abstract 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 abstract 1
- 229910052802 copper Inorganic materials 0.000 abstract 1
- 239000010949 copper Substances 0.000 abstract 1
- 230000004907 flux Effects 0.000 abstract 1
- 238000007689 inspection Methods 0.000 abstract 1
- 239000000696 magnetic material Substances 0.000 abstract 1
- 239000000463 material Substances 0.000 abstract 1
- 230000035699 permeability 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
- G01J1/4214—Photoelectric exposure meters for determining the exposure time in recording or reproducing specially adapted for view-taking apparatus
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Reciprocating, Oscillating Or Vibrating Motors (AREA)
- Electromagnets (AREA)
Abstract
522,919. Photo - electric exposure meters. VOCKENHUBER, K., and HANDLER, A. Dec. 21, 1938, No. 37136. Convention date, Dec. 22, 1937. [Class 98 (i)] [Also in Groups XXXVI and XL] In a photographic photo - electric exposure meter of the moving-coil type, the shutter speed, diaphragm aperture, emulsion sensitivity, or the like are expressed by variation of the magnetic resistance or flux in the field or armature system. As shown in Fig. 1, the yoke 7 of the magnet may be raised or lowered by an adjusting screw 8. A thin layer z of copper, pertinax or other non-magnetic material is provided to prevent adherence of the yoke in its initial position. The moving-coil 4 actuates a pointer indicating the exposure values. The yoke may be divided into two parts each adjustable in accordance with one value such as emulsion sensitivity, or may be provided with two adjusting movements as by two engaging screw-threads, The magnet may comprise two hinged parts that may be spread by an adjustable device, or the poleshoes may be slidable on their common yoke. The magnet, Fig. 4, may have an air gap s<SP>2</SP> in which is turned a disc 20 of Increasing thickness and which may be made of materials of different magnetic permeability. Two or more air gaps and two or more discs 20 may be provided each adjustable in accordance with one value. A prism may be moved between the pole-shoes, or the yoke may be turned with respect to the poleshoes. The pole-shoes may be longitudinally divided and adjustably spread. The moving-coil may be raised or lowered between the pole-shoes. A rotatable magnetic shunt may be arranged at the end of the pole-shoes or the core of a moving coil may be of oval or other non - circular section and may be adjustably turned. The various devices may be used in combination. The Specification as open to inspection under Sect. 91 comprises also the use of the moving- coil for directly actuating the shutter or the diaphragm. This subject-matter does not appear in the Specification as accepted.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT522919X | 1937-12-22 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB522919A true GB522919A (en) | 1940-07-01 |
Family
ID=3675930
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB37136/38A Expired GB522919A (en) | 1937-12-22 | 1938-12-21 | Improvements in photographic photo-electric exposure meters |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB522919A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2730009A (en) * | 1951-03-28 | 1956-01-10 | Marocaine D Achats Et De Const | Photo-electric exposure meters |
| US3082671A (en) * | 1959-05-04 | 1963-03-26 | Yashica Co Ltd | Camera with coupled light meter |
-
1938
- 1938-12-21 GB GB37136/38A patent/GB522919A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2730009A (en) * | 1951-03-28 | 1956-01-10 | Marocaine D Achats Et De Const | Photo-electric exposure meters |
| US3082671A (en) * | 1959-05-04 | 1963-03-26 | Yashica Co Ltd | Camera with coupled light meter |
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