Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1986-10-03
1988-10-25
Westin, Edward P.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
356401, 364491, 364559, G01B 1126, G05B 1500, G05D 300
Patent
active
047806176
ABSTRACT:
A method for successive alignment of each of a plurality of chip patterns regularly arranged on a substrate to a reference position comprises moving the substrate so as to successively make selected chip patterns correspond to the reference position in accordance with design data representative of the positions of the selected chip patterns, measuring the positions of the selected chip patterns when made to correspond to the reference position, determining on the basis of the measured positions, coefficients of an operational equation so that the sum of the square of deviations between positions of the selected chip patterns determined by use of the operational equation and positions of the selected chip patterns represented by design data may be minimum, determining positions corresponding to the plurality of chip patterns on the basis of the operational equation, and moving the substrate in accordance with the determined positions.
REFERENCES:
patent: 4342090 (1982-07-01), Caccoma et al.
patent: 4362385 (1982-12-01), Lobach
Suzuki Hiroyuki
Umatate Toshikazu
Nippon Kogaku K.K.
Westin Edward P.
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