GB376952A - Improvements in or relating to exposure meters for photographic purposes - Google Patents
Improvements in or relating to exposure meters for photographic purposesInfo
- Publication number
- GB376952A GB376952A GB20358/31A GB2035831A GB376952A GB 376952 A GB376952 A GB 376952A GB 20358/31 A GB20358/31 A GB 20358/31A GB 2035831 A GB2035831 A GB 2035831A GB 376952 A GB376952 A GB 376952A
- Authority
- GB
- United Kingdom
- Prior art keywords
- light
- relating
- photographic purposes
- exposure meters
- responsive
- 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 1
- QPLDLSVMHZLSFG-UHFFFAOYSA-N Copper oxide Chemical compound [Cu]=O QPLDLSVMHZLSFG-UHFFFAOYSA-N 0.000 abstract 1
- 239000005751 Copper oxide Substances 0.000 abstract 1
- BUGBHKTXTAQXES-UHFFFAOYSA-N Selenium Chemical compound [Se] BUGBHKTXTAQXES-UHFFFAOYSA-N 0.000 abstract 1
- 239000010949 copper Substances 0.000 abstract 1
- 229910052802 copper Inorganic materials 0.000 abstract 1
- 229910000431 copper oxide Inorganic materials 0.000 abstract 1
- 229960004643 cupric oxide Drugs 0.000 abstract 1
- 239000011669 selenium Substances 0.000 abstract 1
- 229910052711 selenium Inorganic materials 0.000 abstract 1
- JPJALAQPGMAKDF-UHFFFAOYSA-N selenium dioxide Chemical compound O=[Se]=O JPJALAQPGMAKDF-UHFFFAOYSA-N 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)
- Structure And Mechanism Of Cameras (AREA)
- Photoreceptors In Electrophotography (AREA)
- Silver Salt Photography Or Processing Solution Therefor (AREA)
Abstract
376,952. Light-sensitive cells. TONNIES, H. F., 18, Schenkendorfstrasse, Gross- Flottbek, Altona, Germany. July 15, 1931, No. 20358. Convention date, Aug. 16, 1930. Drawings to Specification. [Class 40 (iii).] In a photographic exposure meter use may be made of a light activated cell comprising selenium and selenium oxide which is relatively more responsive to red and yellow light, copper and copper-oxide cells being relatively more responsive to green light.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE376952X | 1930-08-16 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB376952A true GB376952A (en) | 1932-07-21 |
Family
ID=31895481
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB20358/31A Expired GB376952A (en) | 1930-08-16 | 1931-07-15 | Improvements in or relating to exposure meters for photographic purposes |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB376952A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE741456C (en) * | 1933-10-29 | 1943-11-11 | Ig Farbenindustrie Ag | Camera with electric light meter |
| DE748130C (en) * | 1933-11-22 | 1944-10-27 | Device for dimming sidelights in photoelectric light meters | |
| DE748204C (en) * | 1934-07-08 | 1944-10-28 | Electric light meter | |
| DE751203C (en) * | 1936-07-02 | 1952-09-22 | Hans Ferdinand Toennies | Photoelectric light meter attached to a photographic camera |
-
1931
- 1931-07-15 GB GB20358/31A patent/GB376952A/en not_active Expired
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE741456C (en) * | 1933-10-29 | 1943-11-11 | Ig Farbenindustrie Ag | Camera with electric light meter |
| DE748130C (en) * | 1933-11-22 | 1944-10-27 | Device for dimming sidelights in photoelectric light meters | |
| DE748204C (en) * | 1934-07-08 | 1944-10-28 | Electric light meter | |
| DE751203C (en) * | 1936-07-02 | 1952-09-22 | Hans Ferdinand Toennies | Photoelectric light meter attached to a photographic camera |
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