GB504203A - Improvements in or relating to photographic copying apparatus with means for measuring the density of a negative - Google Patents
Improvements in or relating to photographic copying apparatus with means for measuring the density of a negativeInfo
- Publication number
- GB504203A GB504203A GB3027837A GB3027837A GB504203A GB 504203 A GB504203 A GB 504203A GB 3027837 A GB3027837 A GB 3027837A GB 3027837 A GB3027837 A GB 3027837A GB 504203 A GB504203 A GB 504203A
- Authority
- GB
- United Kingdom
- Prior art keywords
- negative
- filters
- lamp
- relating
- density
- 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
- 239000005749 Copper compound Substances 0.000 abstract 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 abstract 1
- 150000001880 copper compounds Chemical class 0.000 abstract 1
- 229910052708 sodium Inorganic materials 0.000 abstract 1
- 239000011734 sodium Substances 0.000 abstract 1
- 230000003595 spectral effect 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
- G01J1/4223—Photoelectric exposure meters for determining the exposure time in recording or reproducing specially adapted for copy - or printing apparatus
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
- Control Of Exposure In Printing And Copying (AREA)
Abstract
504,203. Photo-electric photometers; printing-meters. ZEISS IKON AKT.-GES. Nov. 4, 1937, No. 30278. Convention date, Dec. 31, 1936. [Class 40 (iii)] [Also in Group XX] The exposure time of a negative for photographic printing is determined by the output of a cell 12 receiving light passing through the negative 11, the light being restricted to the spectral range actinic for the paper. Thus, filters may be placed at any point in the system and the filters may be changed to suit different papers. Preferably, a graded filter 9 is employed and is moved iri unison with the movable arm of a variable resistance 8 controlling the current through the lamp 10. The lamp may contain sodium vapour or copper compounds so as to emit only an actinic light.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DED74275D DE716080C (en) | 1937-01-01 | 1937-01-01 | Copier with photocell used to determine the exposure time |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB504203A true GB504203A (en) | 1939-04-21 |
Family
ID=7061607
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3027837A Expired GB504203A (en) | 1937-01-01 | 1937-11-04 | Improvements in or relating to photographic copying apparatus with means for measuring the density of a negative |
Country Status (3)
| Country | Link |
|---|---|
| DE (1) | DE716080C (en) |
| FR (1) | FR827570A (en) |
| GB (1) | GB504203A (en) |
-
1937
- 1937-01-01 DE DED74275D patent/DE716080C/en not_active Expired
- 1937-10-05 FR FR827570D patent/FR827570A/en not_active Expired
- 1937-11-04 GB GB3027837A patent/GB504203A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| DE716080C (en) | 1942-01-13 |
| FR827570A (en) | 1938-04-28 |
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