GB1528195A - Apparatus for the determination of extreme density values in a transparent original - Google Patents
Apparatus for the determination of extreme density values in a transparent originalInfo
- Publication number
- GB1528195A GB1528195A GB3931875A GB3931875A GB1528195A GB 1528195 A GB1528195 A GB 1528195A GB 3931875 A GB3931875 A GB 3931875A GB 3931875 A GB3931875 A GB 3931875A GB 1528195 A GB1528195 A GB 1528195A
- Authority
- GB
- United Kingdom
- Prior art keywords
- original
- photo
- evaluator
- cell
- originals
- 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
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/59—Transmissivity
- G01N21/5907—Densitometers
- G01N21/5911—Densitometers of the scanning type
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Analytical Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Facsimile Scanning Arrangements (AREA)
- Control Of Exposure In Printing And Copying (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
- Control Or Security For Electrophotography (AREA)
Abstract
1528195 Measuring densities of originals AGFA-GEVAERT AG 25 Sept 1975 [25 Sept 1974] 39318/75 Heading G2A An original 1a to be printed on to sensitive material 5 is first moved through a scanning station at which light transmitted thereby passes through a slit 7a and slots 9a (or circular holes) in a rotating diaphragm disc 9 on to a photo-cell 11 so that the densities of successive sub-areas of the original are measured by the photo-cell 11, an evaluator 12 being connected to photo-cell 11 to determine the maximum and/or minimum density measured, preferably for use in a shutter control device 15. As shown detectors 13, 14 detect notches in the edge of a strip 1 of originals 1a to initiate and terminate operation of the evaluator 12 for each original 1a. A photo-electric arrangement 16, 17 may block the passage of signals to the evaluator 12 when light from the original is incident on an area of the disc 9 between two slots 9a. The strip 1 is halted at the exposure station for printing on to sensitive material 5.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19742445831 DE2445831C3 (en) | 1974-09-25 | 1974-09-25 | Device for determining extreme density values |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1528195A true GB1528195A (en) | 1978-10-11 |
Family
ID=5926707
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB3931875A Expired GB1528195A (en) | 1974-09-25 | 1975-09-25 | Apparatus for the determination of extreme density values in a transparent original |
Country Status (5)
Country | Link |
---|---|
JP (1) | JPS5163673A (en) |
CH (1) | CH589867A5 (en) |
DE (1) | DE2445831C3 (en) |
GB (1) | GB1528195A (en) |
IT (1) | IT1042367B (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2138582A (en) * | 1983-02-28 | 1984-10-24 | Canon Kk | Image Reproducing Apparatus |
GB2211314A (en) * | 1987-10-20 | 1989-06-28 | Brother Ind Ltd | Light irradiation control device for use in image recording apparatus |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS53143312A (en) * | 1977-05-20 | 1978-12-13 | Fuji Photo Film Co Ltd | Photographic film scanner |
EP0001747A1 (en) * | 1977-09-23 | 1979-05-16 | ACO-Industriebedarf Gesellschaft m.b.H. | Method and apparatus for evaluating film negatives with respect to their copying ability |
DE2753632C2 (en) * | 1977-12-01 | 1985-08-29 | Agfa-Gevaert Ag, 5090 Leverkusen | Method and device for the selection of photographic originals which are not worth copying |
JPS54157673A (en) * | 1978-06-01 | 1979-12-12 | Tokyo Karaa Kk | Device for detecting density of base of photographic film |
DE3219429A1 (en) * | 1982-05-24 | 1983-11-24 | Horst Dipl.-Ing. 6101 Messel Köth | Method and device for measuring the density or blackening of picture copies |
JPH0619322B2 (en) * | 1984-12-27 | 1994-03-16 | 株式会社島津製作所 | Chromatoskiana |
DE59005903D1 (en) * | 1989-09-01 | 1994-07-07 | Gretag Imaging Ag | Photoelectric scanner. |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3741664A (en) * | 1971-05-28 | 1973-06-26 | Saab Scania Ab | Method for measuring the light transmission of a photographic film giving a digitized output |
-
1974
- 1974-09-25 DE DE19742445831 patent/DE2445831C3/en not_active Expired
-
1975
- 1975-09-08 IT IT2701675A patent/IT1042367B/en active
- 1975-09-19 CH CH1219875A patent/CH589867A5/xx not_active IP Right Cessation
- 1975-09-25 GB GB3931875A patent/GB1528195A/en not_active Expired
- 1975-09-25 JP JP50114957A patent/JPS5163673A/en active Pending
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2138582A (en) * | 1983-02-28 | 1984-10-24 | Canon Kk | Image Reproducing Apparatus |
GB2211314A (en) * | 1987-10-20 | 1989-06-28 | Brother Ind Ltd | Light irradiation control device for use in image recording apparatus |
US4945222A (en) * | 1987-10-20 | 1990-07-31 | Brother Kogyo Kabushiki Kaisha | Light irradiation control device for use in image recording apparatus |
GB2211314B (en) * | 1987-10-20 | 1992-05-13 | Brother Ind Ltd | Light irradiation control device for use in image recording apparatus |
Also Published As
Publication number | Publication date |
---|---|
JPS5163673A (en) | 1976-06-02 |
DE2445831B2 (en) | 1977-12-29 |
DE2445831C3 (en) | 1978-08-31 |
DE2445831A1 (en) | 1976-04-15 |
CH589867A5 (en) | 1977-07-15 |
IT1042367B (en) | 1980-01-30 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PCNP | Patent ceased through non-payment of renewal fee |