GB836892A - Improvements in or relating to photographic projection-printing apparatus - Google Patents

Improvements in or relating to photographic projection-printing apparatus

Info

Publication number
GB836892A
GB836892A GB27935/56A GB2793556A GB836892A GB 836892 A GB836892 A GB 836892A GB 27935/56 A GB27935/56 A GB 27935/56A GB 2793556 A GB2793556 A GB 2793556A GB 836892 A GB836892 A GB 836892A
Authority
GB
United Kingdom
Prior art keywords
printing apparatus
projection
sept
objective
light source
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
GB27935/56A
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 NV
Original Assignee
Agfa 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 AG filed Critical Agfa AG
Publication of GB836892A publication Critical patent/GB836892A/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
    • G03B27/32—Projection printing apparatus, e.g. enlarger, copying camera
    • G03B27/52—Details
    • G03B27/54—Lamp housings; Illuminating means
    • G03B27/545—Lamp housings; Illuminating means for enlargers
    • 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
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • G03B21/208—Homogenising, shaping of the illumination light

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Light Sources And Details Of Projection-Printing Devices (AREA)

Abstract

836,892. Photographic projection-printing apparatus. AGFA A.G. Sept. 12, 1956 [Sept. 21, 1955], No. 27935/56. Class 98(1) In a projection-printing apparatus, a light source which is used without a condenser includes a translucent diffusion surface convexly curved towards the negative plane and so dimensioned and positioned with respect to the negative frame that the straight lines joining points on the negative frame to diametrically opposite points on the edge of the full aperture of the objective intersect the surface or are tangential to it. An electric light source may include a bulb-shaped or tubular diffusion surface and the tubular surface may be that of an incandescent filament lamp or a gas discharge lamp. As shown, an opal lamp 8 is carried in a rotatable socket 12 mounted on an arm 14 which can be displaced along slot 15 perpendicularly to the axis of the objective 6.
GB27935/56A 1955-09-21 1956-09-12 Improvements in or relating to photographic projection-printing apparatus Expired GB836892A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE836892X 1955-09-21

Publications (1)

Publication Number Publication Date
GB836892A true GB836892A (en) 1960-06-09

Family

ID=6761291

Family Applications (1)

Application Number Title Priority Date Filing Date
GB27935/56A Expired GB836892A (en) 1955-09-21 1956-09-12 Improvements in or relating to photographic projection-printing apparatus

Country Status (1)

Country Link
GB (1) GB836892A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4189229A (en) * 1977-03-08 1980-02-19 Zelacolor Systems Establishment Enlarger

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4189229A (en) * 1977-03-08 1980-02-19 Zelacolor Systems Establishment Enlarger

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