GB1296955A - - Google Patents

Info

Publication number
GB1296955A
GB1296955A GB1296955DA GB1296955A GB 1296955 A GB1296955 A GB 1296955A GB 1296955D A GB1296955D A GB 1296955DA GB 1296955 A GB1296955 A GB 1296955A
Authority
GB
United Kingdom
Prior art keywords
reflectors
lens system
plane
degrees
angle
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
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 filed Critical
Publication of GB1296955A publication Critical patent/GB1296955A/en
Expired legal-status Critical Current

Links

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
    • G03B27/542—Lamp housings; Illuminating means for copying cameras, reflex exposure lighting

Abstract

1296955 Lighting arrangements INTERNATIONAL BUSINESS MACHINES CORP 21 May 1971 [31 Aug 1970] 16209/71 Heading G2A An illuminating arrangement in a photocopier having a lens system (12), Fig.1 (not shown), comprises tubular lamps 120 and reflectors 110, 112, 114 which direct light from the lamps in such a way that any given region of a document plane (5) is illuminated with an intensity which increases with increasing displacement of the region from the optical axis of the lens system, thereby compensating for any intensity variation as a function of position on the document plane (5). In particular, the reflectors compensate for the "cosine fourth power law" of attenuation caused by the lens system (12). Reflectors (10, 11) are provided to direct a document image to the copy plane (2a) of the electro-photographic copier of Fig.1 (not shown). In a preferred embodiment, the reflectors 112, 114 contain an angle of 74 degrees, and the reflectors 110, 112 an angle of 163 degrees.
GB1296955D 1970-06-23 1971-05-21 Expired GB1296955A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US4896470A 1970-06-23 1970-06-23
US6826470A 1970-08-31 1970-08-31

Publications (1)

Publication Number Publication Date
GB1296955A true GB1296955A (en) 1972-11-22

Family

ID=26726731

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1296955D Expired GB1296955A (en) 1970-06-23 1971-05-21

Country Status (1)

Country Link
GB (1) GB1296955A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0049146A1 (en) * 1980-09-29 1982-04-07 Xerox Corporation Illumination arrangement for elimination of gray borders in a copying device
US4426153A (en) 1979-06-21 1984-01-17 Ibm Corporation Apparatus for the reduction of image intensity variations in a continuously variable reducing copier

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4426153A (en) 1979-06-21 1984-01-17 Ibm Corporation Apparatus for the reduction of image intensity variations in a continuously variable reducing copier
EP0049146A1 (en) * 1980-09-29 1982-04-07 Xerox Corporation Illumination arrangement for elimination of gray borders in a copying device

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee