Photocopying – Projection printing and copying cameras – Photographing on both sides of photo-sensitive paper
Patent
1992-02-18
1993-02-09
Wintercorn, Richard A.
Photocopying
Projection printing and copying cameras
Photographing on both sides of photo-sensitive paper
355 53, G03B 2732, G03B 2752
Patent
active
051856255
ABSTRACT:
An exposure apparatus having upper and lower ultraviolet rays irradiating devices which are vertically symmetrically disposed above and below a pattern-forming board having through holes therein, and upper and lower light-transmissible plates which are disposed spacedly from each other in a light path of the ultraviolet rays irradiated to the board so as to be vertically symmetrically disposed with respect to the board and horizontally movable, each of the ultraviolet rays irradiating devices having an electric discharge lamp and a reflection mirror and each of the light-transmissible plates having an uneven surface of a sawtooth section. With this arrangement, a proper photochemical reaction can be induced to the photoresist on the surface of the board and the inner wall surfaces of the through holes to thereby improve a working efficiency of a pattern forming process.
REFERENCES:
patent: 4109158 (1978-08-01), Blitchington
patent: 4389115 (1983-06-01), Richter
patent: 4565443 (1986-01-01), Yazaki
patent: 4721980 (1988-01-01), Yazaki
patent: 4883571 (1989-11-01), Kondo et al.
patent: 5037722 (1991-08-01), Watanuki
patent: 5119127 (1992-06-01), Wantanuki
Abe Chiaki
Watanuki Minoru
ORC Manufacturing Co. Ltd.
Wintercorn Richard A.
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