US3734614A - Photographic copying apparatus - Google Patents

Photographic copying apparatus Download PDF

Info

Publication number
US3734614A
US3734614A US00150435A US3734614DA US3734614A US 3734614 A US3734614 A US 3734614A US 00150435 A US00150435 A US 00150435A US 3734614D A US3734614D A US 3734614DA US 3734614 A US3734614 A US 3734614A
Authority
US
United States
Prior art keywords
reflector
light
duct
lamp
support
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
US00150435A
Other languages
English (en)
Inventor
W Zahn
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.)
Agfa Gevaert AG
Original Assignee
Agfa Gevaert 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 Agfa Gevaert AG filed Critical Agfa Gevaert AG
Application granted granted Critical
Publication of US3734614A publication Critical patent/US3734614A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • G03B27/00—Photographic printing apparatus
    • G03B27/32—Projection printing apparatus, e.g. enlarger, copying camera
    • G03B27/52—Details
    • G03B27/54—Lamp housings; Illuminating means

Definitions

  • the present invention relates to photographic copying apparatus in general, and more particularly to improvements in those components of photographic copying apparatus which are used to generate and direct light against copying material.
  • An object of the invention is to provide a photographic copying apparatus with novel and improved means for generating, mixing and confining copying light.
  • Another object of the invention is to provide a photographic printing apparatus with a lighting arrangement whose light output is high, whose dimensions are relatively small, and which can insure uniform illumination of copying material.
  • a further object of the invention is to provide a lighting arrangement which is constructed and assembled in such a way that it can automatically dissipate substantial amounts of heat.
  • An additional object of the invention is to provide a photographic copying apparatus with a novel light source and with a novel reflector for the light source.
  • the invention is embodied in a photographic copying apparatus which comprises a support for photosensitive copying material, an elongated rod-like electronic flash lamp which constitutes the light source and has a first end nearer to and a second end remote from the support for copying material, and a reflector surrounding the-lamp and diverging ina direction from the second toward the first end of the lamp.
  • the symmetry axis of the reflector (which is preferably a hollow three-, fouror more-sided pyramid) preferably coincides with the longitudinal axis of the lamp.
  • the height of the reflector preferably equals or approximates the length of the lamp, and the reflector preferably consists of partly transmitting mirrors, especially cold light mirrors which transmit substantial amounts of heat.
  • a hollow preferably polygonal light mixing duct can be installed between the open base of the reflector and the support for copying material. That end of the duct which is adjacent to the support preferably contains a plate of light-diffusing material and its other end is placed into substantial or full registry with the open base of the reflector.
  • One or more guides for color filters may be provided between the duct and the open base of the reflector.
  • FIG. 1 is a fragmentary schematic sectional view of the light generating, mixing and confining components of a photographic copying apparatus which embodies the invention.
  • FIG. 2 is an end elevational view of the light source and reflector as seen in the direction of arrows from the line 11- of FIG. 1.
  • FIG. 1 there is shown a portion of a photographic copying apparatus which comprises a hollow pyramidal reflector 1 having four triangular walls 1a each of which consists of partly heat transmitting material.
  • the walls la constitute cold light mirrors which can transmit substantial amounts of heat.
  • the light is generated by an elongated rod-like source 2 which is an electronic flash lamp having a longitudinal axis which coincides with the symmetry axis of the reflector 1 (see FIG. 2).
  • the terminals of the lamp 2 are indicated but not specifically referenced in FIG. 1.
  • the energy source for the lamp 2 is shown at 102.
  • the height of the pyramidal reflector 1 slightly exceeds the length of the lamp 2; however, it is equally possible to make the reflector 1 shorter so that its height actually equals or approximates the length of the lamp 2.
  • the area of the open upper end portion (as viewed in FIG. 1) or base lb of the reflector 1 preferably equals or approximates the area of the photosensitive printing or copying material 3 which is to be exposed to light furnished by the lamp 2.
  • the printing material 3 is adjacent to a support here shown as a negative mask 4.
  • the copying apparatus further comprises a polygonal light mixing duct 5 which is disposed between the base 1b of the reflector 1 and the mask 4.
  • the internal surface of the duct 5 reflect light and the light which issues from the upper end of the duct 5 (as viewed in FIG. 1) must pass through a light diffusing plate 6 of opal glass or the like.
  • the purpose of the duct 5 is to insure intensive mixing of light which enters its open lower end and to thus guarantee that the material 3 is exposed to homogeneous printing light.
  • the axial length or height of the duct 5 preferably exceeds its maximum transverse dimension; most preferably, the axial length of the duct 5 is at least twice its maximum transverse dimension.
  • the copying apparatus comprises one or more guides 107 for one or more color filters 7 which can be introduced into the space between the base lb of the reflector 1 and the adjacent lower open end of the mixing duct 5.
  • the filter or filters 7 may constitute subtractive color filters which are moved across the path of light issuing from the base 1b to terminate the exposure of printing material to light in the respective color or colors, or they may constitute a means for coloring the light which issues from the base lb and is to impinge upon the printing material.
  • the illustrated filters are a substractive color filters, they serve as a means for blocking the transmission of light of a particular color to thus terminate the exposure of printing material to such light.
  • the illustrated filters 7 are light coloring filters, they may be introduced across the path of light which passes into the mixing duct 5 in such a way that they intercept some or all of the light which issues from the base lb of the reflector 1. The non-uniform coloration of light which passes through a coloring filter and enters the duct 5 disappears not later than when the light passes through the opal glass plate 6.
  • the light beams which issue from any selected point of the lamp 2 are either reflected on the internal surfaces of the reflector l or enter directly into the mixing duct 5.
  • the point 2a of the lamp 2 emits light beams each of which is caused to enter the lower end of the mixing duct 5, either directly or upon reflection on the internal surfaces of the walls 1a.
  • the light beam 2b which enters the duct 5 without reflection for the light beam 20 which is reflected only once prior to entry into the duct 5 and for the light beam 2d which is reflected several times prior to entry into the duct.
  • the improved apparatus exerts at least some directional effect upon the light which enters the mixing duct. The latter insures further homogenization of light which is homogenized again during passage through the opal glass plate 6 to insure soft and uniform illumination of printing material.
  • the reflector 1 may be assembled of three, four or more cold light mirrors to form a three-, fouror moresided hollow pyramid, and its open base is preferably in at least substantial but most preferably in full registry with the open lower end of the mixing duct 5.
  • An important advantage of the improved copying apparatus is that the heat emission of electronic flash lamp 2 is relatively low. Therefore, the apparatus is not overheated even if the pyramidal reflector l is replaced with a conical reflector diverging in a direction from that end of the lamp which is remote from the support for printing material toward the support.
  • a pyramidal reflector is preferred at this time because the light which is reflected on its internal surface does not have to pass across the lamp 2 but can be reflected around the lamp (see FIG. 2) prior to reaching the open base 1b to enter the adjacent open end of the mixing duct 5.
  • a combination comprising a support for copying material; an elongated rod-like electronic flash lamp having a first end nearer to and a second end remote from said support; a hollow pyramidal reflector surrounding said lamp and diverging in a direction from said second toward said first end, said reflector having an axis of symmetry coinciding with the axis of said lamp; and a light mixing duct interposed between said reflector and said support to mix at least some of the light which issues from said lamp and at least some of the light which is reflected by said reflector before such light reaches the copying material.
  • said duct has a first open end facing said support and a second open end facing said reflector, said reflector having an open end adjacent to the second open end of said duct and further comprising light dispersing means extending across the first open end of said duct.
  • said duct is provided with light-reflecting internal surfaces and has an end adjacent to said support, the crosssectional area of said end of said duct at least approximating the area of copying material at said support.
  • said reflector has an open end in the region of said first end of said lamp and said duct has an open end adjacent to and said duct and at least one filter movable with referand at least substantially registering with the open end of said reflector.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Light Sources And Details Of Projection-Printing Devices (AREA)
US00150435A 1970-06-11 1971-06-07 Photographic copying apparatus Expired - Lifetime US3734614A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19707021913U DE7021913U (de) 1970-06-11 1970-06-11 Fotografisches kopiergeraet

Publications (1)

Publication Number Publication Date
US3734614A true US3734614A (en) 1973-05-22

Family

ID=6612276

Family Applications (1)

Application Number Title Priority Date Filing Date
US00150435A Expired - Lifetime US3734614A (en) 1970-06-11 1971-06-07 Photographic copying apparatus

Country Status (6)

Country Link
US (1) US3734614A (enrdf_load_stackoverflow)
BE (1) BE768367A (enrdf_load_stackoverflow)
CH (1) CH525502A (enrdf_load_stackoverflow)
DE (1) DE7021913U (enrdf_load_stackoverflow)
FR (1) FR2095851A5 (enrdf_load_stackoverflow)
GB (1) GB1351237A (enrdf_load_stackoverflow)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2946070A1 (de) * 1978-11-17 1980-05-29 Energy Conversion Devices Inc Einrichtung zur blitzlicht-formatbilderzeugung auf einem film mit einer schicht aus einem durch energie dispergierbaren bilderzeugenden material
DE2946132A1 (de) * 1978-11-17 1980-06-04 Energy Conversion Devices Inc Bilderzeugungsvorrichtung zur blitzlicht-bilderzeugung auf einem trockenverarbeitbaren film, der auf einer oberflaeche eine schicht aus einem durch energie dispergierbaren bilderzeugenden material traegt
US4260250A (en) * 1980-04-11 1981-04-07 Energy Conversion Devices, Inc. Imaging apparatus

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1125355A (en) * 1978-11-17 1982-06-08 Energy Conversion Devices Inc. Imaging apparatus

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1788910A (en) * 1926-03-11 1931-01-13 Gen Electric Vapor Lamp Co Mercury arc reflector
US3427447A (en) * 1966-11-14 1969-02-11 Mc Graw Edison Co Luminaire optical assembly
US3458254A (en) * 1964-08-28 1969-07-29 Pavelle Ltd Colour printing apparatus
US3526459A (en) * 1968-05-20 1970-09-01 Dennison Mfg Co Optical illuminating system
US3592544A (en) * 1967-04-28 1971-07-13 Lumoprint Zindler Kg Exposure device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1788910A (en) * 1926-03-11 1931-01-13 Gen Electric Vapor Lamp Co Mercury arc reflector
US3458254A (en) * 1964-08-28 1969-07-29 Pavelle Ltd Colour printing apparatus
US3427447A (en) * 1966-11-14 1969-02-11 Mc Graw Edison Co Luminaire optical assembly
US3592544A (en) * 1967-04-28 1971-07-13 Lumoprint Zindler Kg Exposure device
US3526459A (en) * 1968-05-20 1970-09-01 Dennison Mfg Co Optical illuminating system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2946070A1 (de) * 1978-11-17 1980-05-29 Energy Conversion Devices Inc Einrichtung zur blitzlicht-formatbilderzeugung auf einem film mit einer schicht aus einem durch energie dispergierbaren bilderzeugenden material
DE2946132A1 (de) * 1978-11-17 1980-06-04 Energy Conversion Devices Inc Bilderzeugungsvorrichtung zur blitzlicht-bilderzeugung auf einem trockenverarbeitbaren film, der auf einer oberflaeche eine schicht aus einem durch energie dispergierbaren bilderzeugenden material traegt
US4260250A (en) * 1980-04-11 1981-04-07 Energy Conversion Devices, Inc. Imaging apparatus

Also Published As

Publication number Publication date
FR2095851A5 (enrdf_load_stackoverflow) 1972-02-11
DE7021913U (de) 1971-03-04
CH525502A (de) 1972-07-15
BE768367A (nl) 1971-12-13
GB1351237A (en) 1974-04-24

Similar Documents

Publication Publication Date Title
US3492070A (en) Illuminating system for a copying apparatus
JPS5936837B2 (ja) 光半導体装置
US1880414A (en) Illuminating system for photographic apparatus
US3302519A (en) Optical illuminating system
US2760048A (en) Shadowless photographic light
US3734614A (en) Photographic copying apparatus
JPH036618B2 (enrdf_load_stackoverflow)
CN109990242A (zh) 光学装置、车灯和机动车辆
US3697177A (en) Illuminating system for a copying machine
US6449439B1 (en) Unitary light diffusing cavity
US4129372A (en) Light mixing apparatus and photographic enlarger embodying same
US4274131A (en) Light diffusing means for a photographic enlarger
US3316804A (en) Illuminating apparatus for photographic printers and enlargers with specular mirrors
US2530843A (en) Photographic enlarger
US3498714A (en) Gas discharge lamp
JP4229845B2 (ja) 照明器具
US3442582A (en) Lamp arrangement for document scanning and modified lamp
US3334542A (en) Light diffuser
US2053325A (en) Light mixing apparatus
US3185828A (en) Photographic flashlight illumination
US3756719A (en) High efficiency integrator box
US4668081A (en) Exposure device suitable for use in copying machine
US4423953A (en) High intensity light source
US2480101A (en) Illuminating system for photographic enlargers
US3539258A (en) Optical apparatus for document copier