Optics: measuring and testing – By alignment in lateral direction – With light detector
Patent
1979-04-02
1981-12-29
Rosenberger, R. A.
Optics: measuring and testing
By alignment in lateral direction
With light detector
356150, G01B 1100
Patent
active
043079610
ABSTRACT:
A continuous flexible web includes a flat, flexible, non-conductive substrate with copper cladding on at least one major surface of the substrate. Prepunched holes may be formed in and through the web and may provide through-hole connections between printed circuits ultimately formed on opposite sides of the substrate.
Successive sections of the web are indexed through a screen printing apparatus. A photocell system cooperates with preformed through-slots formed selectively in the web and windows formed in a platen beneath the section to precisely locate the platen with the section and relative to a circuit pattern formed in a screen above the section. The underside of the section is then held with the platen and the screen is positioned over the top side of the section. Ink is then flooded onto the screen and ultimately wiped through circuit-pattern openings in the screen and onto the section to form an inked impression of the circuit pattern on the section.
REFERENCES:
patent: 3416853 (1968-12-01), Pickett
patent: 4070117 (1978-01-01), Johannsmeier et al.
patent: 4109158 (1978-08-01), Blitchington et al.
patent: 4153371 (1979-05-01), Koizumi et al.
patent: 4171162 (1979-10-01), Gerard et al.
patent: 4233625 (1980-11-01), Altman
"Flex Screen Printer Operation and Maintenance" Western Electric Company, Inc. pp. 1-5, 13-17.
"A Self-Correcting System for Maintaining Alignment of Webs Between Vacuum Drums" Technical Digest (Western Electric) No. 31, Jul. 1973.
Blitchington Frank H.
Hetherington Jack C.
Hoofnagle J. B.
Rosenberger R. A.
Western Electric Company Inc.
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