GB902312A - Colour filter device - Google Patents
Colour filter deviceInfo
- Publication number
- GB902312A GB902312A GB1342960A GB1342960A GB902312A GB 902312 A GB902312 A GB 902312A GB 1342960 A GB1342960 A GB 1342960A GB 1342960 A GB1342960 A GB 1342960A GB 902312 A GB902312 A GB 902312A
- Authority
- GB
- United Kingdom
- Prior art keywords
- colour
- disc
- discs
- areas
- filter
- 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
- 238000012544 monitoring process Methods 0.000 abstract 1
Classifications
-
- 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
- G03B27/73—Controlling exposure by variation of spectral composition, e.g. multicolor printers
Landscapes
- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- General Physics & Mathematics (AREA)
- Control Of Exposure In Printing And Copying (AREA)
- Optical Filters (AREA)
Abstract
902,312. Colour filters; correcting colour balance in printing. ILFORD Ltd. April 12, 1961 [April 14, 1960], No. 13429/60. Classes 97 (1), 98 (1) and 98 (2). Apparatus for controlling the colour of a beam of light in, e.g. a photographic colour printer comprises a clear filter disc having on it coloured areas (which may merge into a single area at or towards the circumference of the disc) such that the proportion of the circumference of a concentric circle on the disc occupied by the colour area or areas increases as the radius of the said circle increases, means for rotating the said disc, and means for moving the axis of rotation of the disc laterally. As shown in Fig. 1, the colour filter may have petal-shaped clear areas bounded by quadratic curves and coloured areas 2. Two such filter discs may be provided in the light path of a colour printer. Each disc 3A, 3B may, as shown in Fig. 4, be driven via a chain of gears 9A, 9B from motors 10A, 10B. These discs are mounted at their centres on pivoted arms 11A, 11B whereby lateral movement of the discs may be effected. The adjustments required to provide a beam of the required colour may be automatically effected by using monitoring photo-cells. Specification 824,977 is referred to.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1342960A GB902312A (en) | 1960-04-14 | 1960-04-14 | Colour filter device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1342960A GB902312A (en) | 1960-04-14 | 1960-04-14 | Colour filter device |
Publications (1)
Publication Number | Publication Date |
---|---|
GB902312A true GB902312A (en) | 1962-08-01 |
Family
ID=10022816
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1342960A Expired GB902312A (en) | 1960-04-14 | 1960-04-14 | Colour filter device |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB902312A (en) |
-
1960
- 1960-04-14 GB GB1342960A patent/GB902312A/en not_active Expired
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