Early fault detection in an opto-matrix touch input device

Details Early fault detection in an opto-matrix touch input device Early fault detection in an opto-matrix touch input device

1984-10-31

1987-02-24

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

2502221, G01V 904, H01J 4014

Patent

active

046459200

ABSTRACT:
An opto-matrix touch input device which samples and compares beam readings is taught. Briefly stated, phototransistor readings which sample ambient light as well as light from an associated light emitting diode are compared with preset values. If the readings from the phototransistor are below a certain level, then the phototransistor/LED pair are flagged as bad. If the readings are within preset limits, yet below nominal values, then the phototransistor/LED pair are flagged as indicating a marginal beam. In this manner a trouble report may be generated for the purpose of repair or investigation as well as providing a vehicle for keeping a history of the opto-matrix frame condition and thereby a method of early fault detection.

REFERENCES:
patent: 3764813 (1973-10-01), Clement et al.
patent: 3970846 (1976-07-01), Schofield, Jr. et al.
patent: 4243879 (1981-01-01), Carroll et al.
patent: 4266124 (1981-05-01), Weber et al.
patent: 4267443 (1981-05-01), Carroll et al.
patent: 4313109 (1982-01-01), Funk et al.
patent: 4384201 (1983-05-01), Carroll et al.

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