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US2295632A - Process for the production of screen reflex copies - Google Patents

Process for the production of screen reflex copies Download PDF

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Publication number
US2295632A
US2295632A US293709A US29370939A US2295632A US 2295632 A US2295632 A US 2295632A US 293709 A US293709 A US 293709A US 29370939 A US29370939 A US 29370939A US 2295632 A US2295632 A US 2295632A
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US
United States
Prior art keywords
screen
sensitive
covering
production
depressions
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
US293709A
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English (en)
Inventor
Buskes Willem Marie
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.)
NAAMLOOZE VENNOOTSCHAP CHEMISC
Original Assignee
NAAMLOOZE VENNOOTSCHAP CHEMISC
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 NAAMLOOZE VENNOOTSCHAP CHEMISC filed Critical NAAMLOOZE VENNOOTSCHAP CHEMISC
Application granted granted Critical
Publication of US2295632A publication Critical patent/US2295632A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
    • G03C5/00—Photographic processes or agents therefor; Regeneration of such processing agents
    • G03C5/18—Diazo-type processes, e.g. thermal development, or agents therefor
    • G03C5/20—Reflex-printing

Definitions

  • French patent specification 693,335 discloses a process for the production of reflex copies in which the radiation falling on the photo-sensitive material is distributed in screen form.
  • the screen is obtained in any desired photographic manner in a grainless layer, e. g.'a diazo layer on a film.
  • This screen film in the production of the reflex copy, is in intimate contact with terial, practically always a film, which again is in contact with the original.
  • the reflecting layer consists of a mirror on glass, from which in any desired manner, the reflecting layer has been removed locally and in screen form.
  • the screen-like reflecting surface is brought into intimate contact with the sensitive layer.
  • the reflecting surface is, although not permeable to the light, extremely thin (about I and, furthermore, it is mostly varnished to protect it from injury and corrosion.
  • the screen side of such a reflecting screen can therefore be regarded as practically quite flat.
  • the lenses are naturally always at a certain distance from the sensitive layer and the space between the lenses and the sensitive layer is filled with any desired transparent material, the side of which directed towards the sensitive layer is also always fiat.
  • the covering screens also a, distance between the screen parts and the sensitive layer is possible when a sumciently parallel directed irradiation'is used.
  • a further reduction of the contact which is troublesome and which occurs in practice is caused by dust particles between the screen and the sensitive layer.
  • a particle itself causes trouble when it is located in a beam of rays, its presence has, as a result, that round the point at which it is placed there may exist a zone of reduced contact so that the particle works out on the copy as a kind of auriole of reduced pictorial strength.
  • the surface of the covering screen which during the production of a screen reflex copy is directed towards the sensitive material .
  • the screen side is not flat but is made in the form of a relief.
  • the screen side therefore has depressed parts; depths" or depressions and raised parts: elevations.”
  • the relief figure coincides with the screen figure and the elevations" with the transparent parts of the screen.
  • Figure 1 represents a diagrammatic crosssection of a screen with relief; the screen R is in contact with a sensitive sheet B; D are the depths or depressions of the'covering screen and H the transparent or translucent elevations.
  • the sensitive material should develop a gas during the exposure, it is important that this gas can escape and for this it is necessary for the depressions of the screen side to form continuous conduits, if necessary with crossing conduits or the like which permit such escape. With crossing depression conduits the elevations form small islands and the depressions a continuous system.
  • a particularly good efiect is obtained when the material of the screen is hard, at least harder than the substance of the sensitive material.
  • a very unshakable contact is obtained with a hard screen material, e. g. glass and a soft sensitive material, e. g. cellulose derivative with plasticisers.
  • Figure 2 shows how the elevations of the screen can as it were press a little into the surface of the sensitive material.
  • the invention has the following advantages.
  • the covering factor in screen reflectcgraphy is greater than 0.5 and consequently when the covering parts coincide with the depressions, these depressions take up much of the total surface and the elevations take up less of the total surface. This increases the unshakability of the contact even with low pressure, as the surface pressure exerted by the elevations on the photo-sensitive material is greater when their total surface is comparatively smaller.
  • the covering parts are reflecting at least inwardly i. e. towards the side from which the irradiation impinges, then these parts, if they are in the depressions and in particular if these depressions have a form particularly suitable thereto, can also cause a certain economy of irradiation. They deflect as it were part of the rays, which otherwise are lost by reflection, towards the permeable elevations (see Figure 3). A general rule for the most suitable shape of such a relief naturally cannot be given as this depends upon the direction of the radiation used.
  • this radiation predominantly contains rays with a small angle of incidence then for example the tips of the cross-sectional triangles in Figure 3 are advantageously raised somewhat, whilst when using a radiation with many rays with large angles of incidence, these tips should preferably be somewhat lowered. If the covering parts in the depressions reflect outwardly i. e. to-
  • the invention also relates to lenticular covering screens.
  • the relief of the screen side can naturally be obtained in various ways known per se, e. g. by etching or grinding a glass surface, by goil'ering a plastic material, and the like.
  • the following may illustrate one such a screen:
  • a glass plate one surface of which has a relief obtained by etching according to Figure 4, wherein H are the elevations and D the depths (H 0.035 0.035 mm., and the distance between the centres of H and of H is 0.08 mm. whilst the depth of the relief is approximately 0.015 mm.) is provided with a mirror on this one side and then polished. The mirror. surface then disappears from the elevations and remains in the depressions. It is then varnished, and heat treated, for the purpose of strengthening. To produce a' reflex copy, the original is placed with the side to be reproduced upward in a printing frame and upon this a photo-sensitive diazo type film of a thickness of 0.07 mm.
  • the diazo type 'fllm consists of acetyl cellulose. It is superficially saponifled on one side and this saponifled surface is treated with a diazo compound with para-positioned, tertiary amino group, e. g. with para-diazo ethyl-benzyl aniline. The exposure takes place with a vertical arc lamp with surrounding reflector.
  • Process for the production of screen reflex copies which comprises projecting actinic rays onto an original through a screen having alternate opaque and transparent areas and a sensitized sheet, one face of the latter contacting with the screen and the other face contactingwith the original, the face of the screen contacting with the sensitive sheet having the form of a relief in which the alternate elevations and depressions coincide with the alternate transparent and opaque portions of the screen respectively.
  • a covering screen having alternate opaque and translucent areas for use in making reflex pressed areas are interconnected between the depressed areas therebetween, the opaque desions of the screen and reflect towards both sides.
  • a covering screen for use in making reflex copies of an original on a sensitive sheet held between theoriginal and the covering screen comprising a translucent member with acontact surface having small spaced translucent flat elevated contact areas in one plane and opaque pressed areas having light reflecting 'outer surfaces, substantially as and for the purpose described.
  • a covering screen for use in making reflex copies of an original on a sensitive sheet held between the original and the covering screen comp i ng a translucentmember with a contact surface having,;.sm all spaced translucent flat elevated contact areas in one plane and opaque depressed areas ,therebetween, the outer surfaces ofthe opaque areas forming mirrors, substantially as and for the purpose described.
  • a covering screen as defined in claim 7, wherein the opaque areas are mirror surfaces I which reflect light both outwardly and inwardly,
  • Screens for use in the production of screen reflex copies characterized by a screen side in the formof a relief with small transparent elevations and larger non-transparent reflecting depths in which the reflecting depths are formed by mirrors reflecting towards both sides.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Photosensitive Polymer And Photoresist Processing (AREA)
  • Overhead Projectors And Projection Screens (AREA)
US293709A 1939-04-14 1939-09-07 Process for the production of screen reflex copies Expired - Lifetime US2295632A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL216434X 1939-04-14

Publications (1)

Publication Number Publication Date
US2295632A true US2295632A (en) 1942-09-15

Family

ID=19779091

Family Applications (1)

Application Number Title Priority Date Filing Date
US293709A Expired - Lifetime US2295632A (en) 1939-04-14 1939-09-07 Process for the production of screen reflex copies

Country Status (4)

Country Link
US (1) US2295632A (de)
CH (1) CH216434A (de)
DE (1) DE725305C (de)
FR (1) FR864584A (de)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2602741A (en) * 1945-11-01 1952-07-08 Grinten Chem L V D Sensitized sheets for screen reflectography
US2602740A (en) * 1947-12-31 1952-07-08 Grinten Chem L V D Sensitive diazotype sheet for screen reflectography comprising a screen skin
US3010390A (en) * 1954-06-29 1961-11-28 Buskes Willem Marie Planographic printing plates
US3010389A (en) * 1953-03-09 1961-11-28 Buskes Willem Marie Photographic transfer printing plates
US3125013A (en) * 1964-03-17 Apparatus for reflex copying by the use of fiber optical devices
US3260603A (en) * 1962-11-23 1966-07-12 Minnesota Mining & Mfg Rough surfaced copy-sheet intermediate
US3278302A (en) * 1962-01-02 1966-10-11 Xerox Corp Phosphorescent screen reflex
US3982949A (en) * 1974-08-30 1976-09-28 Edgard Reymond Half-tone screen making by decapitation of substrate projections

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL82334C (de) * 1951-03-20

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3125013A (en) * 1964-03-17 Apparatus for reflex copying by the use of fiber optical devices
US2602741A (en) * 1945-11-01 1952-07-08 Grinten Chem L V D Sensitized sheets for screen reflectography
US2602740A (en) * 1947-12-31 1952-07-08 Grinten Chem L V D Sensitive diazotype sheet for screen reflectography comprising a screen skin
US3010389A (en) * 1953-03-09 1961-11-28 Buskes Willem Marie Photographic transfer printing plates
US3010390A (en) * 1954-06-29 1961-11-28 Buskes Willem Marie Planographic printing plates
US3278302A (en) * 1962-01-02 1966-10-11 Xerox Corp Phosphorescent screen reflex
US3260603A (en) * 1962-11-23 1966-07-12 Minnesota Mining & Mfg Rough surfaced copy-sheet intermediate
US3982949A (en) * 1974-08-30 1976-09-28 Edgard Reymond Half-tone screen making by decapitation of substrate projections

Also Published As

Publication number Publication date
FR864584A (fr) 1941-04-30
CH216434A (de) 1941-08-31
DE725305C (de) 1942-09-18

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