Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1992-10-02
1993-08-31
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
101114, 356401, G01N 2186, G01B 1100, B41F 1500
Patent
active
052411877
ABSTRACT:
A CCD camera is set under a print object having a registration hole, and a screen plate having a reference mark on its screen corresponding to the registration hole is arranged above the position of the print object. First, the amount of elongation of the screen is measured from a position of the reference mark in an unelongated state of the screen and that of the reference mark in a elongated state of the screen upon operation of a squeegee, and the shift amount between the registration hole and the reference mark is calculated from positions of the reference mark and the registration hole before printing This shift amount is corrected by the amount of elongation of the screen, and the screen plate is moved in response to the corrected shift amount to attain registration.
REFERENCES:
patent: 3766635 (1973-10-01), Cranston
patent: 4813351 (1989-03-01), Pierson, Jr.
patent: 4835401 (1989-05-01), Sajiki
patent: 5138667 (1992-08-01), Roch et al.
patent: 5163367 (1992-11-01), Newman
patent: 5170058 (1992-12-01), Berasi et al.
Ikeda Yoshinori
Nakanishi Katsuki
Messinger Michael
Muarta Manufacturing Co., Ltd.
Nelms David C.
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