Photocopying – Projection printing and copying cameras – Illumination systems or details
Patent
1988-10-14
1992-03-10
Braun, Fred L.
Photocopying
Projection printing and copying cameras
Illumination systems or details
355228, 355229, G03G 1504
Patent
active
050953290
ABSTRACT:
A copying machine having a fluorescent lamp as a light source for illuminating an original document. The machine has a print switch for commanding a copy start and a mechanism for expose-scanning the document being illuminated by the lamp in response to a command from the print switch. In this copying mechine, the lamp is maintained illuminating for a predetermined time period after completion of exposure-scanning by the exposure-scanning mechanism and the same is turned OFF if no copy start command is provided within the predetermined time period. Further, if the machine has a sensor for measuring the light amount, it becomes also possible to maintain the lamp illuminating for a predetermined time period after the light amount has reached a reference value subsequent to power input to the machine and to turn OFF the lamp if the predetermined time period passes without copy start command.
REFERENCES:
patent: 4463284 (1984-07-01), Tamura et al.
patent: 4827313 (1989-05-01), Corona
patent: 4845526 (1989-07-01), Ito
patent: 4853739 (1989-08-01), Miyamoto et al.
patent: 4855648 (1989-08-01), Yagasaki
patent: 4887122 (1989-12-01), Morikawa
IBM Technical Disclosure Bulletin, vol. 19, No. 2, Jul. 1976 "Lamp Control for Document Reproduction Machine" pp. 388-389.
Braun Fred L.
Minolta Camera Kabushiki Kaisha
Smith Matthew S.
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