Photocopying – Contact printing – Light boxes
Patent
1988-06-23
1989-08-01
Moses, R. L.
Photocopying
Contact printing
Light boxes
355 30, G03G 1504
Patent
active
048537390
ABSTRACT:
An illuminating device for image exposure in an electrophotographic copying machine, which employs a fluorescent lamp whose voltage is variable as an illumination source and has signals to indicate when the copying machine is ready to make copies and to tell when the light amount for illumination is insufficient after preliminary lighting being performed for a fixed amount of time. A temperature sensor to detect tube wall temperature of the fluorescent lamp and a light sensor to detect the amount of light emitted from the lamp installed in the device to permit the preliminary lighting of the fluorescent lamp to be carried out at an appropriate voltage. Therefore, clear copies are readily made soon after the power of the copying machine is turned on, and, electric power waste and/or serious troubles of the machine which may occur by further use as well as exhaustion of the lamp by unnecessary high voltages can be avoided.
REFERENCES:
patent: 3330180 (1967-07-01), Ferguson et al.
patent: 4098552 (1978-07-01), Okukawa
patent: 4536681 (1985-08-01), Maki
Matsuuchi Yasuyuki
Miyamoto Hirohisa
Minolta Camera Kabushiki Kaisha
Moses R. L.
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