Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1986-02-28
1987-08-04
Westin, Edward P.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
340712, 340706, G09G 128
Patent
active
046848010
ABSTRACT:
A touch entry system employing arrays of emitter and detector opto devices located around the periphery of an irradiated field detects intrusion of an opaque element such as a stylus within the field. The detector analog output is converted to a digital signal for input into a microprocessor. Digital signals input into the microprocessor can vary due to inconsistencies in conventional opto devices. A programmable amplifier responsive to the microprocessors preconditions the analog signals prior to analog to digital conversion to bring all digital signals corresponding to the unblocked emitter beam condition within a normalized range before input into the microprocessor.
REFERENCES:
patent: 4459476 (1984-07-01), Weissmueller et al.
patent: 4590410 (1986-05-01), Jonsson
patent: 4591710 (1986-05-01), Komadina et al.
Carroll Arthur B.
Carstedt John K.
Garrett James E.
Hough Stewart E.
Hunter Paul R.
Carroll Touch Inc.
Pitts Robert W.
Ruoff Jessica
Westin Edward P.
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