GB1426237A - Apparatus for the production of halftone images - Google Patents

Apparatus for the production of halftone images

Info

Publication number
GB1426237A
GB1426237A GB4058773A GB4058773A GB1426237A GB 1426237 A GB1426237 A GB 1426237A GB 4058773 A GB4058773 A GB 4058773A GB 4058773 A GB4058773 A GB 4058773A GB 1426237 A GB1426237 A GB 1426237A
Authority
GB
United Kingdom
Prior art keywords
raster
electro
photographic
rasters
tone
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
GB4058773A
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.)
Pentacon GmbH Foto und Feinwerktechnik
Original Assignee
Pentacon Dresden VEB
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 Pentacon Dresden VEB filed Critical Pentacon Dresden VEB
Publication of GB1426237A publication Critical patent/GB1426237A/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
    • G03B15/00—Special procedures for taking photographs; Apparatus therefor
    • 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
    • G03B27/66—Details specially adapted for holding half-tone screens
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/04—Apparatus for electrographic processes using a charge pattern for exposing, i.e. imagewise exposure by optically projecting the original image on a photoconductive recording material
    • G03G15/04027—Apparatus for electrographic processes using a charge pattern for exposing, i.e. imagewise exposure by optically projecting the original image on a photoconductive recording material and forming half-tone image

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Exposure Or Original Feeding In Electrophotography (AREA)
  • Control Of Exposure In Printing And Copying (AREA)

Abstract

1426237 Electro-photographic half-tone images PENTACON DRESDEN KAMERA-UND KINOWERKE VEB 29 Aug 1973 [23 Oct 1972] 40587/73 Heading G2M An apparatus for the production of raster electro-photographic half-tone images from original images by a half-tone process contains two rasters and a sensitive electro-photographic such. An image of a first raster arranged in a subsidiary ray path is reflected by a semi-transparent mirror into the ray path of an optical system for the illumination of an image of an original on to a sensitive electro-photographic surface. A second raster of the same geometrical type as the first raster but with larger light areas and lower optical density is additionally situated to be (a) in contact with a transparent image original or (b) in the intermediate image plane of a two stage optical system. The two rasters are so adjusted that they have the same raster constant in the final image plane and the light areas of the first raster lie in the middle of the light areas of the second - ster. The optical density of the dark areas of the second raster is equal to the exposure range, expressed in logarithmic units, of the electro-photographic surface. The raster tone values of the first and second rasters lies between 60 and 90% and 30 and 60% respectively.
GB4058773A 1972-10-23 1973-08-29 Apparatus for the production of halftone images Expired GB1426237A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DD16640672A DD102490A1 (en) 1972-10-23 1972-10-23

Publications (1)

Publication Number Publication Date
GB1426237A true GB1426237A (en) 1976-02-25

Family

ID=5488639

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4058773A Expired GB1426237A (en) 1972-10-23 1973-08-29 Apparatus for the production of halftone images

Country Status (3)

Country Link
DD (1) DD102490A1 (en)
DE (1) DE2327995A1 (en)
GB (1) GB1426237A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7339754B2 (en) * 2005-05-20 2008-03-04 Neal Phillip H Switching illuminating tweezers with magnifier

Also Published As

Publication number Publication date
DD102490A1 (en) 1973-12-12
DE2327995A1 (en) 1974-05-02

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee