Etching machines for manufacturing printed circuit boards

Details Etching machines for manufacturing printed circuit boards Etching machines for manufacturing printed circuit boards

1986-11-06

1988-09-20

Schor, Kenneth M.

Adhesive bonding and miscellaneous chemical manufacture

Differential fluid etching apparatus

With microwave gas energizing means

134 18, 134 254, 156627, C23F 102

Patent

active

047723491

ABSTRACT:
The machine is of the kind comprising an elongate etch chamber, and a conveyor which is arranged to feed p.c.b's through said etch chamber. In accordance with the invention the etch chamber is divided into two spaced sections comprising a first relatively long main etch section (1) followed by a second relatively short control etch section (2), and two control stations are provided, the first (5) between the two spaced sections, and the second (6) subsequent to said second section, the first and second control stations providing locations for checking and comparing the etch conditions of the p.c.b's at the two stations in order to control the speed of the conveyor appropriately so that the amount of undercut of the p.c.b's exiting from said second etch chamber is kept to a minimum. Preferably, checking is carried out automatically by providing a light source (7,8) beneath the conveyor (1a) at each of the first and second control stations which direct light upwardly through p.c.b's passing through said control stations, light responsive sensor means (9, 10) above the conveyor opposite each light source, which are operative to generate a signal which varies according to the amount of light passing through ach p.c.b, and a comparator to which the signals from both sensor means are fed to produce a correction signal for adjusting the conveyor speed.

REFERENCES:
patent: 3756898 (1973-09-01), Frantzen et al.
patent: 3808067 (1974-04-01), Brown

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