Fabrication of printed wiring boards by projection imaging

Details Fabrication of printed wiring boards by projection imaging Fabrication of printed wiring boards by projection imaging

1989-03-01

1992-08-11

Hayes, Monroe H.

Photocopying

Projection printing and copying cameras

Step and repeat

359 43, G03B 2742, G02F 113

Patent

active

051383683

ABSTRACT:
A hard copy such as a printed wiring board is fabricated by exposing to radiation a liquid crystal cell in which a desired pattern is written and directing the pattern-carrying radiation projected from the cell by transmission or reflection to a substrate which is coated with a material sensitive to the radiation and disposed alignedly at an exposure position by optical registration. The duration of the exposure is controlled for a given light intensity and for the type of the coating material. A pattern may be written in one cell substantially simultaneously as another cell is used for the projection imaging. After a produced pattern is compared with a reference pattern, corrections may be effected through a processor which controls the writing of a pattern in a cell.

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