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GB1539468A - Enlarger head lamphouse for printing variable contrast photographic material - Google Patents

Enlarger head lamphouse for printing variable contrast photographic material

Info

Publication number
GB1539468A
GB1539468A GB4009676A GB4009676A GB1539468A GB 1539468 A GB1539468 A GB 1539468A GB 4009676 A GB4009676 A GB 4009676A GB 4009676 A GB4009676 A GB 4009676A GB 1539468 A GB1539468 A GB 1539468A
Authority
GB
United Kingdom
Prior art keywords
lamphouse
photographic material
contrast photographic
printing variable
variable contrast
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
GB4009676A
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.)
Novartis AG
Original Assignee
Ciba Geigy 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 Ciba Geigy AG filed Critical Ciba Geigy AG
Priority to GB4009676A priority Critical patent/GB1539468A/en
Publication of GB1539468A publication Critical patent/GB1539468A/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
    • G03B27/727—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)
GB4009676A 1977-07-04 1977-07-04 Enlarger head lamphouse for printing variable contrast photographic material Expired GB1539468A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB4009676A GB1539468A (en) 1977-07-04 1977-07-04 Enlarger head lamphouse for printing variable contrast photographic material

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4009676A GB1539468A (en) 1977-07-04 1977-07-04 Enlarger head lamphouse for printing variable contrast photographic material

Publications (1)

Publication Number Publication Date
GB1539468A true GB1539468A (en) 1979-01-31

Family

ID=10413188

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4009676A Expired GB1539468A (en) 1977-07-04 1977-07-04 Enlarger head lamphouse for printing variable contrast photographic material

Country Status (1)

Country Link
GB (1) GB1539468A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2912502A1 (en) * 1978-03-31 1979-10-11 Ciba Geigy Ag Lamphouse with removable light box - placed between two lamps each carrying colour filter and slidably mounted in slot
FR2466037A1 (en) * 1979-09-19 1981-03-27 Mechnick William
US4299204A (en) * 1980-05-21 1981-11-10 Cotsworth John L Solar collector
US4299481A (en) * 1978-03-31 1981-11-10 Ciba-Geigy Ag Adjustable current lamphouse
US4394717A (en) 1981-02-02 1983-07-19 Ciba-Geigy Ag Illumination system for copying apparatus
WO1991010161A1 (en) * 1989-12-22 1991-07-11 Bbs Ag International Device for determining a colour filter value for the exposure of a gradation conversion paper

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2912502A1 (en) * 1978-03-31 1979-10-11 Ciba Geigy Ag Lamphouse with removable light box - placed between two lamps each carrying colour filter and slidably mounted in slot
US4299481A (en) * 1978-03-31 1981-11-10 Ciba-Geigy Ag Adjustable current lamphouse
FR2466037A1 (en) * 1979-09-19 1981-03-27 Mechnick William
US4299204A (en) * 1980-05-21 1981-11-10 Cotsworth John L Solar collector
US4394717A (en) 1981-02-02 1983-07-19 Ciba-Geigy Ag Illumination system for copying apparatus
WO1991010161A1 (en) * 1989-12-22 1991-07-11 Bbs Ag International Device for determining a colour filter value for the exposure of a gradation conversion paper
US5164764A (en) * 1989-12-22 1992-11-17 Bbs Ag International Apparatus for determining a color filter value for the exposure of a gradation change paper

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Legal Events

Date Code Title Description
PS Patent sealed
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19950704