GB902312A - Colour filter device - Google Patents

Colour filter device

Info

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
Application number
GB1342960A
Inventor
David Walter Paskin
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ilford Imaging UK Ltd
Original Assignee
Ilford Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Ilford Ltd filed Critical Ilford Ltd
Priority to GB1342960A priority Critical patent/GB902312A/en
Publication of GB902312A publication Critical patent/GB902312A/en
Expired legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03BAPPARATUS 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
    • G03B27/00Photographic printing apparatus
    • G03B27/72Controlling or varying light intensity, spectral composition, or exposure time in photographic printing apparatus
    • G03B27/73Controlling 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.
GB1342960A 1960-04-14 1960-04-14 Colour filter device Expired GB902312A (en)

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)

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