US1407029A - Photoprocess screen and method of preparing same - Google Patents

Photoprocess screen and method of preparing same Download PDF

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Publication number
US1407029A
US1407029A US417011A US41701120A US1407029A US 1407029 A US1407029 A US 1407029A US 417011 A US417011 A US 417011A US 41701120 A US41701120 A US 41701120A US 1407029 A US1407029 A US 1407029A
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US
United States
Prior art keywords
screen
plate
plates
opaque
dots
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 - Lifetime
Application number
US417011A
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English (en)
Inventor
Hatt Joseph Arthur Henry
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to US417011A priority Critical patent/US1407029A/en
Priority to GB18346/21A priority patent/GB170270A/en
Priority to FR538342D priority patent/FR538342A/fr
Priority to DEH86429D priority patent/DE362952C/de
Application granted granted Critical
Publication of US1407029A publication Critical patent/US1407029A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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

Definitions

  • the invention relates to the art of printing and more particularly to the preparation of. half-tone printing plates for either black or colored printing.
  • the obj cot of the invention is to improve the tonal quality of half-tone reproductions without the aid of hand work, requiring no special manipulations of the diaphragm of the lens during exposure, when making a negative, or any moving of the source of light when the screen is used for making half-tones by the printing-through-the-screen method.
  • Fig. 1 illustrates one part of the screen
  • Fig. 2 the other element of the screen of Fig. 3, while Fig. 3 represents the complete screen
  • Fig. 4 is a section on lines 4-4 of Fig. 3. All views are obviously exaggerated and greatly enlarged.
  • a screen of the present invention I first provide a number of glass plates suitably coated with a sensitized film, preferably a bic-hromated colloid.
  • the coating is preferably of the type described in my Patent No. 1,317,493, of Sept. 30, 1919 the characteristic of which is that the sensitized film upon the glass, in so far as it is not acted upon by rays of light, shall be capable of ready removal therefrom.
  • I next provide a regular cross-line screen of suitable mesh i. e., a standard screen of the art or a special screen, such, for example, as the one invented by me and described in my Patent No. 1,175,445 of Mar. 14, 1916. This screen is placed in front of one of the glass plates sensitized as described.
  • a plain sheet of glass will usually be required between the screen and the sensitized glass plate in order to secure the proper screen distance, which may be defined as the distance which produces a round dot on the sensitized plate through the rectangular, clear glass 0pen ings of the screen.
  • This well known practice is shown, for example, in the illustrations accompanying my Patent No. 1,134,381 Of APIIl 6, 1915.
  • the plate After being placed in a suitable printing frame the plate is then exposed to an are light. By varying the time of exposure this round dot may be made larger or smaller at will.
  • the plate is now developed, for instance, by being immersed in water (of. my Patent No. 1,317,493), and the round dot image which remains is dyed until it is quite black or opaque.
  • the dyelng can be satisfactorily accomplished by well known appropriate aniline dyes.
  • the result of this treatment is illustrated in Fig. 1, in which the glass plate 1 is coated with a series of spaced opaque dots 2. The space between the dots is not covered by a film but is clear glass.
  • This plate of Fig. 1 is then used for the purpose of making the other half of my new screen.
  • the plate of Fig. 1 is brought into contact with a second sensitized plate similar to the one from which Fig. 1 was prepared and a proper exposure made.
  • the second plate is then developed in the same manner as the first plate was developed and it is also dyed but to a different degree.
  • Fig. 2 is drawn so as to represent that portion of one of the two plates which corresponds to a correspondmg portion of the other plate (i. e. the plate is the plates of Fig. 1 and of Fig. 2, are
  • a complete screen which consists of three portions, first a general ground of translucent film 3 and upon that ground interspaced throughout the entire surface of the screen a series of clear glass openings 4 and a series of opaque dots 2.
  • a printing-through-a-screen half-tone is made by placing a continuous tone negative in contact with the metal or stone plate or surface previously sensitized and then placing the screen at the proper distance above the negative and exposing the combination of screen, negative and sensitized plate to the direct rays of an arc lamp or the sun).
  • the clear glass 0 enings of this plate occupy approximatel t e same positlons as the rectangular c ear glass openings in the regular or standard screens.
  • the second plate which I now use (Fig. l) which is placed either in contact with the first named plate or is placed in front of it with an air space between, consists of small, round, opaque dots of about the same size and number as the clear glass openings of the first named plate, the remainder of said second plate bemg clear glass.
  • a screen comprising a transparent foundation, a coating of translucent material partially but not wholly covering the transparent foundation so as to leave clear transparent spots through said coating and I a series of opaque spots located in non-interfering relation with respect to the clear transparent spots.
  • a screen comprising two glass plates united together, one of said plates carrying upon the surface thereof a series of opaque dots, the remaining surface of said plate being uncoated, the second plate being coated with a film of translucent material interrupted by a series of clear glass dots, the union between the plates being such that the opaque dots of one plate alternate with the clear glass dots of the other.
  • a screen comprising two plates of transparent material suitably united together, and located in the space between the two plates, a layer of periodically perforated translucent material and a serles of minute pieces of opaque material, the minute pieces of opaque material being positioned in juxtaposition to the translucent material.
  • the process of producing screens which comprises preparing a transparent plate carrying upon the surface thereof a series of dots of non-transparent or opaque material, preparing a second transparent plate coated with a lightly translucent material periodically perforated to exhibit clear glass spots, and then placing the two plates in juxtaposition so that the opaque spots of one plate alternate with the clear glass spots of the other.
  • the process of making screens which comprises. producing a series of dots upon a transparent plate coated with a sensitized film consisting of material capable of ready removal except where acted upon b light, removing the film except where the ots applate and dyeing the remaining portion of the film to a light trenslucency, and then placing the two plates together so that the 10 opaque spots of one will alternate with th clear dots of the other In testimony whereof I have hereunto set my hand.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Photosensitive Polymer And Photoresist Processing (AREA)
  • Optical Filters (AREA)
  • Exposure And Positioning Against Photoresist Photosensitive Materials (AREA)
  • Overhead Projectors And Projection Screens (AREA)
US417011A 1920-10-14 1920-10-14 Photoprocess screen and method of preparing same Expired - Lifetime US1407029A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US417011A US1407029A (en) 1920-10-14 1920-10-14 Photoprocess screen and method of preparing same
GB18346/21A GB170270A (en) 1920-10-14 1921-07-06 A photo-process screen and method of preparing same
FR538342D FR538342A (fr) 1920-10-14 1921-07-18 écran photographique et son procédé de préparation
DEH86429D DE362952C (de) 1920-10-14 1921-07-26 Raster

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US417011A US1407029A (en) 1920-10-14 1920-10-14 Photoprocess screen and method of preparing same

Publications (1)

Publication Number Publication Date
US1407029A true US1407029A (en) 1922-02-21

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
US417011A Expired - Lifetime US1407029A (en) 1920-10-14 1920-10-14 Photoprocess screen and method of preparing same

Country Status (4)

Country Link
US (1) US1407029A (fr)
DE (1) DE362952C (fr)
FR (1) FR538342A (fr)
GB (1) GB170270A (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE958529C (de) * 1955-06-23 1957-02-21 Herbst & Illig Kontakt-Raster

Also Published As

Publication number Publication date
FR538342A (fr) 1922-06-08
DE362952C (de) 1922-11-03
GB170270A (en) 1922-07-06

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