LED write apparatus and method for making same

Details LED write apparatus and method for making same LED write apparatus and method for making same

1995-04-04

1997-03-11

Smith, Matthew S.

Photocopying

Projection printing and copying cameras

Illumination systems or details

347238, G03B 2700, G03B 2754, B41J 245

Patent

active

056106858

ABSTRACT:
It is an object of the invention to provide a LED write apparatus wherein the arrangement step of LED chips is eliminated by constituting the LED head by a single LED chip composed of LEDs and electrical connection of the respective LEDs with driving circuits is carried out with ease.
A LED head chip is constituted in such a manner that 2400 LEDs in all whose width a is selected to be narrow, namely about 10 .mu.m are formed on a Si substrate having a smaller width (about 30 mm) than that of a photosensitive drum (length of A4 size: 210 mm) through a GaAs substrate and as well peripheral circuits including a driving circuit such as a transistor are integratedly formed on the Si substrate. The light from the LED head chip is magnified via a lens to form an image on the photosensitive drum.

REFERENCES:
patent: 4211586 (1980-07-01), Fang et al.
patent: 4533148 (1985-11-01), Behrens et al.
patent: 4700206 (1987-10-01), Yamakawa
patent: 4978974 (1990-12-01), Etzel
patent: 5160965 (1992-11-01), Koide
patent: 5337074 (1994-08-01), Thornton

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