GB430073A - Improvements in photographic exposure meters - Google Patents
Improvements in photographic exposure metersInfo
- Publication number
- GB430073A GB430073A GB1027635A GB1027635A GB430073A GB 430073 A GB430073 A GB 430073A GB 1027635 A GB1027635 A GB 1027635A GB 1027635 A GB1027635 A GB 1027635A GB 430073 A GB430073 A GB 430073A
- Authority
- GB
- United Kingdom
- Prior art keywords
- scale
- pointer
- exposure
- exposure times
- curves
- 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
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 abstract 2
- 229910052802 copper Inorganic materials 0.000 abstract 2
- 239000010949 copper Substances 0.000 abstract 2
- 239000000463 material Substances 0.000 abstract 2
- 230000035945 sensitivity Effects 0.000 abstract 2
- BERDEBHAJNAUOM-UHFFFAOYSA-N copper(I) oxide Inorganic materials [Cu]O[Cu] BERDEBHAJNAUOM-UHFFFAOYSA-N 0.000 abstract 1
- KRFJLUBVMFXRPN-UHFFFAOYSA-N cuprous oxide Chemical compound [O-2].[Cu+].[Cu+] KRFJLUBVMFXRPN-UHFFFAOYSA-N 0.000 abstract 1
- 229940112669 cuprous oxide Drugs 0.000 abstract 1
- 235000014113 dietary fatty acids Nutrition 0.000 abstract 1
- 239000003792 electrolyte Substances 0.000 abstract 1
- 229930195729 fatty acid Natural products 0.000 abstract 1
- 239000000194 fatty acid Substances 0.000 abstract 1
- 150000004665 fatty acids Chemical class 0.000 abstract 1
- 239000011521 glass Substances 0.000 abstract 1
- 238000007689 inspection 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
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Transmission Devices (AREA)
Abstract
430,073. Photographic exposure meters. PRINSEN, F. B. A., 38, Copernicusstraat, The Hague. Oct. 3, 1933, No. 10276/35. Divided out of 426,404, under which a Specification was laid open to inspection under Sect. 91 of the Acts, April 5, 1934. [Class 98 (i)] [See also Group XL] In an exposure meter in which a photoelectric cell is directly electrically connected to an electrical measuring instrument having a pointer moving along a scale, the scale is provided with curves or connecting lines indicating the relation between the deflection of the pointer and the exposure times or diaphragm aperture. The diaphragm apertures may be plotted as ordinates and the exposure times as abscissae of the scale. The pointer may, alternatively, carry the scale. Fig. 3 shows one arrangement in which curves indicating the appropriate diaphragm apertures for given exposure times are used. In the form shown in Fig. 6, the pointer carries a scale of diaphragm apertures and moves over a set of curves indicating exposure times which may be altered according to the sensitivity of the material used by turning the disc carrying the exposure time indicia so that a pointer on the disc indicates the sensitivity of the material in degrees Scheiner. The photo-electric cell used may consist of a flat copper tray, containing an insulated copper plate coated with cuprous oxide, the tray is filled with an electrolyte, e.g. a fatty acid and closed by a glass plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1027635A GB430073A (en) | 1933-10-03 | 1933-10-03 | Improvements in photographic exposure meters |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1027635A GB430073A (en) | 1933-10-03 | 1933-10-03 | Improvements in photographic exposure meters |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB430073A true GB430073A (en) | 1935-06-04 |
Family
ID=9964858
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1027635A Expired GB430073A (en) | 1933-10-03 | 1933-10-03 | Improvements in photographic exposure meters |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB430073A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2529337A (en) * | 1947-02-15 | 1950-11-07 | Cleveland Patents Inc | Indicating dial for photoelectric light meters |
| US2550936A (en) * | 1946-11-28 | 1951-05-01 | Poirette Paul | Interchangeable dial for exposure meters |
| DE751203C (en) * | 1936-07-02 | 1952-09-22 | Hans Ferdinand Toennies | Photoelectric light meter attached to a photographic camera |
| DE920530C (en) * | 1941-02-23 | 1954-11-25 | Leitz Ernst Gmbh | Exposure meters for photographic cameras |
| DE974330C (en) * | 1941-06-20 | 1960-11-24 | Leitz Ernst Gmbh | Photographic camera with built-in electric light meter |
-
1933
- 1933-10-03 GB GB1027635A patent/GB430073A/en not_active Expired
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE751203C (en) * | 1936-07-02 | 1952-09-22 | Hans Ferdinand Toennies | Photoelectric light meter attached to a photographic camera |
| DE920530C (en) * | 1941-02-23 | 1954-11-25 | Leitz Ernst Gmbh | Exposure meters for photographic cameras |
| DE974330C (en) * | 1941-06-20 | 1960-11-24 | Leitz Ernst Gmbh | Photographic camera with built-in electric light meter |
| US2550936A (en) * | 1946-11-28 | 1951-05-01 | Poirette Paul | Interchangeable dial for exposure meters |
| US2529337A (en) * | 1947-02-15 | 1950-11-07 | Cleveland Patents Inc | Indicating dial for photoelectric light meters |
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