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GB1362941A - Photographic printing apparatus and method of photographic printing - Google Patents

Photographic printing apparatus and method of photographic printing

Info

Publication number
GB1362941A
GB1362941A GB4443171A GB4443171A GB1362941A GB 1362941 A GB1362941 A GB 1362941A GB 4443171 A GB4443171 A GB 4443171A GB 4443171 A GB4443171 A GB 4443171A GB 1362941 A GB1362941 A GB 1362941A
Authority
GB
United Kingdom
Prior art keywords
photo
cell
light
photographic printing
adjustable resistor
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
GB4443171A
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.)
Agfa Gevaert AG
Original Assignee
Agfa Gevaert AG
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 Agfa Gevaert AG filed Critical Agfa Gevaert AG
Publication of GB1362941A publication Critical patent/GB1362941A/en
Expired legal-status Critical Current

Links

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
    • G03B27/80—Controlling or varying light intensity, spectral composition, or exposure time in photographic printing apparatus in dependence upon automatic analysis of the original
    • 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
    • G03B27/727—Optical projection devices wherein the contrast is controlled optically (e.g. uniform exposure, two colour exposure on variable contrast sensitive material)

Landscapes

  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • General Physics & Mathematics (AREA)
  • Projection-Type Copiers In General (AREA)
  • Light Sources And Details Of Projection-Printing Devices (AREA)
  • Control Of Exposure In Printing And Copying (AREA)
  • Cameras Adapted For Combination With Other Photographic Or Optical Apparatuses (AREA)

Abstract

1362941 Photographic printing apparatus AGFA-GEVAERT A G 23 Sept 1971 [23 Sept 1970] 44431/71 Heading G2A Photographic printing apparatus has a main exposing light 1 Fig. 1 for projecting an image of an original 4 on to photographic printing material 6 a further light 10 for uniformly exposing the print material to alter its gradation, the operation of the two lights overlapping in time, and means for controlling the image exposure including a photo-electric device 8 which is arranged to only receive light from the main exposing light 1. In one embodiment, a yellow filter 9 is positioned in front of the photo-cell, and a blue filter placed in front of the further light source. The photo-cell receives light from main exposing light via a semi-reflecting mirror 7. Alternatively, the photo-cell and its filter is positioned beneath the printing material, Fig. 2 (not shown), or the photo-cell may be positoned in the plane of the objective 5 to receive light scattered from the original, in which case no filters are necessary, Fig.3 (not shown). The apparatus is controlled by the circuit shown in Fig. 4. One input to a comparison amplifier 17 is connected to the common point of the photo-cell 8 and a timing capacitor 15. The other input is connected to a voltage divider in which adjustable resistor 21 is coupled to on adjustable resistor 22 in the further light source circuit, adjustable resistor 19 sets the apparatus to the basic hardness of the printing material, and adjustable resistor 26 corrects for deviations from the reciprocity law.
GB4443171A 1970-09-23 1971-09-23 Photographic printing apparatus and method of photographic printing Expired GB1362941A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19702046885 DE2046885A1 (en) 1970-09-23 1970-09-23 Photographic copier

Publications (1)

Publication Number Publication Date
GB1362941A true GB1362941A (en) 1974-08-07

Family

ID=5783189

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4443171A Expired GB1362941A (en) 1970-09-23 1971-09-23 Photographic printing apparatus and method of photographic printing

Country Status (5)

Country Link
BE (1) BE772715A (en)
CH (1) CH534898A (en)
DE (1) DE2046885A1 (en)
FR (1) FR2107295A5 (en)
GB (1) GB1362941A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4350438A (en) 1976-06-03 1982-09-21 Hoechst Aktiengesellschaft Light dosing device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4350438A (en) 1976-06-03 1982-09-21 Hoechst Aktiengesellschaft Light dosing device

Also Published As

Publication number Publication date
CH534898A (en) 1973-03-15
FR2107295A5 (en) 1972-05-05
BE772715A (en) 1972-03-17
DE2046885A1 (en) 1972-03-30

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Legal Events

Date Code Title Description
CSNS Application of which complete specification have been accepted and published, but patent is not sealed