Photocopying – Contact printing – Light boxes
Patent
1988-01-29
1989-06-06
Prescott, A. C.
Photocopying
Contact printing
Light boxes
355215, G03G 1500, G03G 15048
Patent
active
048375985
ABSTRACT:
An erasing array for erasing an image on a photosensitive drum of a copying machine includes an auxiliary printed board. A surface of the auxiliary printed board opposes a surface of the photosensitive drum. A plurality of LED chips are directly bonded, at a predetermined pitch, to the surface of the auxiliary printed board. The surface of the auxiliary printed board is covered by a casing which independently covers the plurality of LED chips. The casing includes a plurality of window holes for guiding light emitted from the LED chips onto the photosensitive drum. Gaps are respectively formed between the window holes and the LED chips. Parts such as a lens are not arranged in the gaps. A dustproof film is adhered to the casing, to prevent dust from entering the case through the window holes. The film covers the window holes and transmits therethrough the light emitted from the LED chips.
REFERENCES:
patent: 4582417 (1986-04-01), Yagasaki et al.
patent: 4627707 (1986-12-01), Tani et al.
patent: 4653899 (1987-03-01), Watanabe
patent: 4740818 (1988-04-01), Tsilibes et al.
Kabushiki Kaisha Toshiba
Prescott A. C.
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