US3710708A - Exposing and developing apparatus - Google Patents

Exposing and developing apparatus Download PDF

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Publication number
US3710708A
US3710708A US00116897A US3710708DA US3710708A US 3710708 A US3710708 A US 3710708A US 00116897 A US00116897 A US 00116897A US 3710708D A US3710708D A US 3710708DA US 3710708 A US3710708 A US 3710708A
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United States
Prior art keywords
sheet material
developing
photosensitive
image bearing
section
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Expired - Lifetime
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US00116897A
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English (en)
Inventor
Y Koyama
G Schuman
R Collins
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Dietzgen Corp
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Dietzgen Corp
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    • 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
    • G03B27/02—Exposure apparatus for contact printing
    • G03B27/14—Details
    • G03B27/30—Details adapted to be combined with processing apparatus
    • G03B27/303—Gas processing
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03D—APPARATUS FOR PROCESSING EXPOSED PHOTOGRAPHIC MATERIALS; ACCESSORIES THEREFOR
    • G03D7/00—Gas processing apparatus

Definitions

  • ABSTRACT An apparatus wherein a photosensitive sheet material devclopable by contact with a gaseous developing agent is placed beneath an image bearing sheet material and the combination first exposed and then developed without separating the two sheet materials.
  • Exposure to ultraviolet light under a translucent master or original such as in engineering drawing, type material, or other image-bearing design will decompose the diazo compound where it has been struck by light and retain it where it has been protected from light by opaque areas of the original.
  • the print is then developed by reacting the retained diazo compound with a coupler to form a highly colored azo dye in precise duplication of the original.
  • Diazo-type reproduction processes are divided into two categories, a moist process and a dry process.
  • the moist process is a one-component diazo-type process in which the diazo compound is on the base while the coupler is applied to the coated surface in a developer solution.
  • the dry process is a two-component process in which both the diazo compound and the coupler are on the base and in which development is achieved without wetting by using a gaseous developing agent, viz., moist ammonia vapors to induce the coupling reaction.
  • Another object of the invention is to provide a new and improved apparatus and process for exposing and developing diazo-type photosensitive sheet material using ammonia vapors for development.
  • the invention contemplates an apparatus for exposing and developing photosensitive sheet material comprising an exposing section and a developing section, said exposing section comprising a rotatable transparent cylindrical member, a plurality of circumferentially spaced parallel rollers proximate to said member, taut endless belts passing outwardly around all of said rollers and having a reversely folded section passing inwardly of said rollers, and partially encircling said member, a light source within said member adjacent said partially encircled area, means to drive one of said rollers, said sheet material being received during exposure to said light source between said belts and said member, and said developing section comprising a chamber which is enclosed except for an opening adjacent said member, a perforated blanket over said opening partially encircling said member and closely adjacent said member, means to guide said sheet material from said belts to said blanket, said sheet material after exposure being-received between the outer face of said member and the inner surface of said perforated blanket, heating means inside said member adjacent said
  • the invention further contemplates a process for exposing and developing photosensitive sheet material developable by contact with a gaseous developing agent which comprises passing a light ray penetrable image bearing sheet material superimposed on a photosensitive sheet material over a rotatable transparent cylindrical member with one side of said image bearing sheet material in contact with said member and the other side in contact with one side of said photosensitive sheet material, exposing said photosensitive sheet material to light rays through said member and said image bearing sheet material while said image bearing sheet material and said photosensitive sheet material are superimposed and partially encircle a part of the circumference of said member, thereafter passing said superimposed image bearing sheet material and said photosensitive sheet material, while in contact with and partially encircling another portion of said member, through a developing zone containing a gaseous developing agent, while heating said member in an area adjacent said zone, and thereafter separating said image bearing sheet material from said photosensitive sheet material.
  • the photosensitive sheet material is normally made by forming a photosensitive layer on a porous base sheet material which usually consists of felted cellulose fibers, e.g., paper, but, can consist of any other type of porous sheet including plastic films or felted plastic fibers.
  • a porous base sheet material which usually consists of felted cellulose fibers, e.g., paper, but, can consist of any other type of porous sheet including plastic films or felted plastic fibers.
  • the kind of. photosensitive composition employed in making the photosensitive layer does not form a part of the invention but the invention is primarily concerned with the use of light sensitive diazo-type materials. Examples of such materials are disclosed in U.S. Pat. No. 3,027,256, and many other examples can be given of such materials.
  • the base sheet material'on which the photosensitive layer is formed should be sufficiently porous to permit permeation of such sheet material by a gaseous developing agent such as ammonia vapors. If the base sheet'material is non-porous, the image bearing sheet material and the photosensitive sheet material can be passed through the apparatus and the process practiced as previously described except that afterthe image bearing sheet and the photosensitive sheet material have passed through the apparatus the image bearing sheet material is separated from the photosensitive sheet material and the photosensitive sheet material is reversed and is passed through the apparatus again with light source turned off so that the photosensitive layer is directly exposed to the gaseous developing agent. Inasmuch as this requires passing the photosensitive sheet material through the developing agent twice, it is less desirable, even though feasible, and in fact is still an improvement over operations in which the image bearing sheet material has to be separated from the photosensitive sheet material in the apparatus.
  • the apparatus comprises a rotatable transparent cylindrical member 1 usually made of glass or any other suitable transparent material, e.g., transparent polycarbonates (Lexan).
  • a plurality of circumferentially spaced parallel rollers 2, 3 and 4 are positioned proximate to said member 1 and a taut endless belt 5 made of rubber or any other suitable material passes outwardly around all of said rollers and has a reversely folded section passing inwardly of said rollers and partially encircling said member 1.
  • a light source consisting of any number of ultraviolet lamps 6 isdisposed within said member 1 adjacent said partially encircled area and a reflector 7 is provided to'reflect the light rays in the direction of said-partially encircled areaL
  • the aforesaid partially encircled area which is generally indicated at 8 is the exposure section of the apparatus.
  • The'belt 5 is driven by a motor or by any other suitable means, not shown, connected to drive roller 4.
  • the developing section generally indicated at 10 comprises a chamber 11 which is enclosed except for an opening 12 adjacent said member 1 and a valved inlet 13 which, as'shown, is normally in an area remote from said opening and is usually closed during operation.
  • a perforated blanket 14 made of polytetrafluoroethylene (Teflon) or any other suitable material is disposed over opening 12 partially encircling and closely adjacent to member 1.
  • the blanket 14 is fastened in any suitable manner at 15 to the housing 16 of chamber 11.
  • the blanket 15 can also be fastened at point 17.
  • a heating element 18 is disposed in member 1 adjacent the developing section.
  • the opening 12 of the development section is sealed by blades 19 and-20 which are secured to the housing 16 adjacent opening 12 at the lower and upper ends of said opening, respectively.
  • These sealing members 19 and 20 can be'made of spring metal which may or may not be coatedwith plastic, rubber or other material.
  • a developing chamber heating element 21 is provided to vaporize the developing agent in developing chamber 11.
  • the unit is supported on base 22 and end plates, not shown. I v
  • the size of the'apparatus can be varied depending upon the particular need. Where large prints'are being produced, it is conventional to make the apparatus 48 inches wide in which case the member 1 would be ap-' sheet material from the exposing section to the developing section.
  • valve inlet 13 is opened in order to introduce a quantity of aqueous ammonia (or ammonia vapors) into chamber 11.
  • the ammonia is heated by means of heating element 21 and normally a temperature of to F. is developed in chamber 11.
  • the sensitized print paper or other photosensitive sheet material is placed beneath the original image bearing sheet material and inserted into the apparatus at 25. Thereupon it is carried between inner surface of member 26 and the outer surface of belts 5 into contact with the outer surface of member 1 where it is exposed almost immediately to raysfrom lamp 6 and continues through the exposure section 8 until it passes into the development section 10.
  • the ammonia vapors pass through the openings in perforated blanket 14 and through the porous base carrying the photosensitive layer, thereby developing the photosensitive layer.
  • Heating element 18 should generate enough heat to prevent condensation of moisture on member l.
  • the photosensitive layer is coated on a non-porous sheet material so that the ammonia vapors cannot penetrate the base in order to completely develop the I invention isnot limited to the use of any particular type of heating element but it is usually desirable to use an electrically heated element.
  • V the construction and operation of the apparatus is relatively simple. and uncomplicated.
  • the apparatus contains no complex mechanism and is inexpensive to make. It will be understood that various types of materials can be used in constructing the apparatus without departing from the scope of the invention.
  • Apparatus for exposing and developing photosen sitive sheet material comprising an exposing section and a developing section, said exposing section comprisinga rotatable transparent cylindrical member, a plurality of circumferentially spaced parallel rollers proximate to said member, taut endless belts passing outwardly around all of said rollers and having a reversely folded section passing inwardly of said rollers, and partially encircling said member, a light source within said member adjacent said partially encircled area, means to drive one of said rollers, said sheet material being received during exposure to said light source between said belts and said member, and said developing section comprising a chamber which is enclosed except for an opening adjacent said member, a perforated blanket over said opening partially encircling said member and closely adjacent said member, means to guide said sheet material from said belt to said blanket, said sheet material after exposure being received between the outer face of said member and the inner surface of said perforated blanket, heating means inside said member adjacent said opening, sealing means for sealing the sides of said opening while permitting ingress and e
  • said sheet material comprises a light ray penetrable image bearing sheet material and a porous photosensitive sheet material disposed beneath said image bearing sheet whereby rays from said light source pass through said image bearing sheet material to said photosensitive sheet material and said gaseous developing agent passes through what was initially the underside of said photosensitive sheet material, said image bearing material and said photosensitive material remaining in contact with one another throughout their passage through said exposure and developing sections.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Photographic Developing Apparatuses (AREA)
  • Non-Silver Salt Photosensitive Materials And Non-Silver Salt Photography (AREA)
US00116897A 1971-02-19 1971-02-19 Exposing and developing apparatus Expired - Lifetime US3710708A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US11689771A 1971-02-19 1971-02-19

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US3710708A true US3710708A (en) 1973-01-16

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US00116897A Expired - Lifetime US3710708A (en) 1971-02-19 1971-02-19 Exposing and developing apparatus

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US (1) US3710708A (de)
DE (1) DE2206451A1 (de)
FR (1) FR2126020A5 (de)
GB (1) GB1342999A (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4099868A (en) * 1976-03-29 1978-07-11 Hoechst Aktiengesellschaft Copying apparatus, in particular photoprinting apparatus, comprising a developing chamber which operates according to the dry-development principle, and a dosing device for liquid developer medium
US4135814A (en) * 1976-05-28 1979-01-23 Hoechst Aktiengesellschaft Process and apparatus for the production of photocopies using two-component diazotype material
US4241989A (en) * 1979-01-15 1980-12-30 Am International, Inc. Diazo developing apparatus
US4371247A (en) * 1979-05-07 1983-02-01 Robert K. Hewelt Arrangement for eliminating ammonia vapors from developed diazo copy material
US4772906A (en) * 1985-09-16 1988-09-20 Regma Photocopy development station
US4868919A (en) * 1987-03-05 1989-09-19 Sharp Kabushiki Kaisha Color image copying device

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2587507B1 (fr) * 1985-09-16 1987-12-11 Regma Station d'exposition et appareil de reproduction d'originaux par diazocopie comportant ladite station
FR2610737B1 (fr) * 1987-02-09 1989-06-23 Regma Appareil de reproduction d'originaux par diazocopie
FR2633068A1 (fr) * 1988-06-15 1989-12-22 Regma Appareil de reproduction d'originaux par diazocopie

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2090389A (en) * 1936-04-06 1937-08-17 Kunstadter Vilmos Photoprinting and developing apparatus
US2630744A (en) * 1950-01-16 1953-03-10 Paragon Revolute Corp Evaporator for gas developing machines
US2917985A (en) * 1955-05-11 1959-12-22 Kalvar Corp Continuous printing device
FR1322930A (fr) * 1962-02-20 1963-04-05 Tire Plan Machine pour le développement de papiers sensibles à la lumière
GB1062560A (en) * 1963-12-21 1967-03-22 Kalle Ag Apparatus for the photographic production of copies

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2090389A (en) * 1936-04-06 1937-08-17 Kunstadter Vilmos Photoprinting and developing apparatus
US2630744A (en) * 1950-01-16 1953-03-10 Paragon Revolute Corp Evaporator for gas developing machines
US2917985A (en) * 1955-05-11 1959-12-22 Kalvar Corp Continuous printing device
FR1322930A (fr) * 1962-02-20 1963-04-05 Tire Plan Machine pour le développement de papiers sensibles à la lumière
GB1062560A (en) * 1963-12-21 1967-03-22 Kalle Ag Apparatus for the photographic production of copies

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4099868A (en) * 1976-03-29 1978-07-11 Hoechst Aktiengesellschaft Copying apparatus, in particular photoprinting apparatus, comprising a developing chamber which operates according to the dry-development principle, and a dosing device for liquid developer medium
US4135814A (en) * 1976-05-28 1979-01-23 Hoechst Aktiengesellschaft Process and apparatus for the production of photocopies using two-component diazotype material
US4241989A (en) * 1979-01-15 1980-12-30 Am International, Inc. Diazo developing apparatus
US4371247A (en) * 1979-05-07 1983-02-01 Robert K. Hewelt Arrangement for eliminating ammonia vapors from developed diazo copy material
US4772906A (en) * 1985-09-16 1988-09-20 Regma Photocopy development station
US4868919A (en) * 1987-03-05 1989-09-19 Sharp Kabushiki Kaisha Color image copying device

Also Published As

Publication number Publication date
GB1342999A (en) 1974-01-10
FR2126020A5 (de) 1972-09-29
DE2206451A1 (de) 1972-08-24

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