Glass manufacturing – Processes – With chemically reactive treatment of glass preform
Patent
1988-09-28
1990-04-10
Lindsay, Robert L.
Glass manufacturing
Processes
With chemically reactive treatment of glass preform
65 61, 156644, 156660, 156663, 346 11, 346140R, C03C 2506
Patent
active
049157183
ABSTRACT:
In the fabrication of an ink jet nozzle structure for ink jet printing, photoform glass is initially exposed in the general configuration of the ink chambers and nozzles desired to be formed in the glass. Thin transverse lines are left unexposed across the desired transition point between the ink chamber and the nozzle, and across a transition between ink inlet and the chamber. The ink chamber is desired to be of greater depth than either the inlet area or the nozzle, so two-step acid etching is used. The nozzle and the inlet are masked, as by taping, during a portion of the acid etching and unmasked during another portion, so that the chamber (which is never masked) is etched deeper than the inlet and nozzle areas. In order to assure the acid does not under-etch the tape, obscuring the transition between the chamber and the nozzle or inlet areas and causing manufacturing variations and inconsistency of the performance of the ink jet, the unexposed lines in the photoform glass remain as barriers at these transitions. Etching acid cannot encroach underneath the mask, with the barrier remaining. After the etching is complete, the thin barriers are easily removed by mechanical action, such as sandblasting, leaving sharp and consistent transitions at both ends of the ink chamber.
REFERENCES:
patent: 4125845 (1978-11-01), Stevenson
patent: 4339763 (1982-07-01), Kyser et al.
patent: 4506276 (1985-03-01), Kyser et al.
patent: 4549188 (1985-10-01), Shackleton
patent: 4786303 (1988-11-01), Padalino
Freiburger Thomas M.
Lindsay Robert L.
On Target Technology, Inc.
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