GB712167A - Improvements in or relating to photographic enlargers and optical projection apparatus - Google Patents

Improvements in or relating to photographic enlargers and optical projection apparatus

Info

Publication number
GB712167A
GB712167A GB3246152A GB3246152A GB712167A GB 712167 A GB712167 A GB 712167A GB 3246152 A GB3246152 A GB 3246152A GB 3246152 A GB3246152 A GB 3246152A GB 712167 A GB712167 A GB 712167A
Authority
GB
United Kingdom
Prior art keywords
light source
photographic
discharge tube
liquid
exit aperture
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
GB3246152A
Inventor
Arthur Leonard Sparks
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.)
VERE KENSINGTON Ltd DE
Original Assignee
VERE KENSINGTON Ltd DE
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 VERE KENSINGTON Ltd DE filed Critical VERE KENSINGTON Ltd DE
Priority to GB3246152A priority Critical patent/GB712167A/en
Publication of GB712167A publication Critical patent/GB712167A/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

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Abstract

712,167. Lanterns for photographic enlargers and optical projectors. DE VERE (KENSINGTON), Ltd. Feb. 27, 1953 [Dec. 22, 1952], No. 32461/52. Classes 97(1) and 98(1) [Also in Group XI] An illuminating device for a photographic enlarger or optical projector comprises a luminous discharge tube bent or coiled to form a light source of extended area, and a liquid-filled condenser lens, and a diffusing screen each of the same overall shape and size as the light source and disposed in front of the light source. As shown, a discharge tube 2 fed from a transformer 3 and comprising coplanar parallel limbs covering the exit aperture of the lantern is backed by a white diffusely reflecting screen 4 and the exit aperture is covered by a hollow plano-convex plastic lens filled with a liquid such as a mineral oil and having a translucent plane diffusing face 5 adjacent the plane of the negative or other transparency whereby the distribution of illumination thereover is rendered uniform.
GB3246152A 1952-12-22 1952-12-22 Improvements in or relating to photographic enlargers and optical projection apparatus Expired GB712167A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3246152A GB712167A (en) 1952-12-22 1952-12-22 Improvements in or relating to photographic enlargers and optical projection apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3246152A GB712167A (en) 1952-12-22 1952-12-22 Improvements in or relating to photographic enlargers and optical projection apparatus

Publications (1)

Publication Number Publication Date
GB712167A true GB712167A (en) 1954-07-21

Family

ID=10338948

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3246152A Expired GB712167A (en) 1952-12-22 1952-12-22 Improvements in or relating to photographic enlargers and optical projection apparatus

Country Status (1)

Country Link
GB (1) GB712167A (en)

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