Optics: measuring and testing – By polarized light examination – With light attenuation
Patent
1983-01-28
1985-07-16
Rosenberger, R. A.
Optics: measuring and testing
By polarized light examination
With light attenuation
356400, 901 47, B23Q 1524
Patent
active
045293155
ABSTRACT:
The invention is a multi-channel position detection system which utilizes several separate emitters and a single photodetector to, for example, align a multi-lead component manipulator with a predetermined location in a printed circuit board. An oscillator circuit generates a modulated signal for each emitter and a multiplier circuit develops an output signal based upon the oscillator output and the photodetector output. The photodetector provides an output responsive to the emitter signal as attenuated by the circuit board location relative to the emitter. When the lead hole of the circuit board is aligned with the emitter and photodetector minimum attenuation of the signal occurs.
REFERENCES:
patent: 3007097 (1961-10-01), Shelley et al.
patent: 3698820 (1972-10-01), Hanff et al.
patent: 4081669 (1978-03-01), Klingman
patent: 4109158 (1978-08-01), Blitchington et al.
Cohen Brian S.
Dowling Kevin J.
Sanderson Arthur C.
Rosenberger R. A.
Trempus Thomas R.
Vollero Michael
Westinghouse Electric Corp.
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