GB412697A - Production of screens for half-tone processes - Google Patents

Production of screens for half-tone processes

Info

Publication number
GB412697A
GB412697A GB6115/33A GB611533A GB412697A GB 412697 A GB412697 A GB 412697A GB 6115/33 A GB6115/33 A GB 6115/33A GB 611533 A GB611533 A GB 611533A GB 412697 A GB412697 A GB 412697A
Authority
GB
United Kingdom
Prior art keywords
screens
marks
enlarged
tone
screen
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
GB6115/33A
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.)
IG Farbenindustrie AG
Original Assignee
IG Farbenindustrie 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 IG Farbenindustrie AG filed Critical IG Farbenindustrie AG
Publication of GB412697A publication Critical patent/GB412697A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
    • G03F5/00—Screening processes; Screens therefor
    • G03F5/02—Screening processes; Screens therefor by projection methods
    • G03F5/12—Screening processes; Screens therefor by projection methods using other screens, e.g. granulated screen

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Preparing Plates And Mask In Photomechanical Process (AREA)
  • Control Of Exposure In Printing And Copying (AREA)

Abstract

412,697. Photo - mechanical screens. I. G. FARBENINDUSTRIE AKT.-GES., Frankfort-on-Main, Germany. Feb. 28, 1933, Nos. 6115, 6116, and 6117. Convention dates, Feb. 29, 1932, Aug. 5, 1932, and Oct. 22, 1932. [Class 98 (ii).] A half-tone screen in which the screen elements are contiguous and the variation of tone is continuous, is obtained by copying an enlarged positive or negative element 1, Fig. 3, having the requisite theoretical distribution of light and shade, by multiple projection through a perforated screen 2 on to a photographic plate 3. The enlarged picture of the element 1 may be made by reducing photographically a vignette such as shown in Fig. 4 and enlarging the resulting picture by soft focus. In place of the enlarged element 1, a set of marks having outlines corresponding to lines of equal blackening may be employed, such marks being placed successively with their centres at exactly the same point and exposed for appropriate times. Duplicates of the improved screens are obtained photographically. For large screens, a number of smaller screens are assembled side by side and printed on to a film of the desired size. The Specification as open to inspection under Sect. 91 states also that a mechanically operated diaphragm having a continuously contracting or expanding aperture may be used in place of the set of marks. This subject-matter does not appear in the Specification as accepted.
GB6115/33A 1932-02-29 1933-02-28 Production of screens for half-tone processes Expired GB412697A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE412697X 1932-02-29

Publications (1)

Publication Number Publication Date
GB412697A true GB412697A (en) 1934-07-05

Family

ID=6438344

Family Applications (1)

Application Number Title Priority Date Filing Date
GB6115/33A Expired GB412697A (en) 1932-02-29 1933-02-28 Production of screens for half-tone processes

Country Status (2)

Country Link
US (1) US2095015A (en)
GB (1) GB412697A (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2661651A (en) * 1949-07-22 1953-12-08 Stipek Johann Franz Projection of stereoscopic pictures
NL76436C (en) * 1950-11-15
US3215054A (en) * 1962-10-03 1965-11-02 Douglas Aircraft Co Inc Method and apparatus for producing ambient light trapping filters
JPS5017002U (en) * 1973-06-06 1975-02-24

Also Published As

Publication number Publication date
US2095015A (en) 1937-10-05

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