Light quantity controller and input device

Details Light quantity controller and input device Light quantity controller and input device

1981-08-20

1984-08-21

Laroche, Eugene R.

Electric lamp and discharge devices: systems

With radiant energy sensitive control means

Radiant energy controlled regulation of the current supply...

315135, 315136, 315151, 315224, 315226, 315DIG7, H05B 4129, H05B 41392

Patent

active

044672462

ABSTRACT:
A light quantity controller and an input device are disclosed. The light quantity controller comprises a light source, a photo-sensor to detect a light quantity of the light source, a signal source for generating a reference signal, a comparator for comparing the detected light amount with the reference signal, and control circuit to control a duty ratio of the energization to the light source in accordance with the compare result to maintain the light quantity of the light source at a constant level. The light quantity controller further comprises a comparator to compare the energization signal to the light source with a reference signal to detect the degradation of the light source. The input device has a key matrix including a plurality of input ports and a plurality of output ports of a control unit interconnected through switches. A signal source independent from the output ports of the key matrix is connected to at least one of the input ports through switches.

REFERENCES:
patent: 2711463 (1955-06-01), Goeppinger et al.
patent: 3681654 (1972-08-01), Quinn
patent: 3947117 (1976-03-01), Basu et al.
patent: 4190795 (1980-02-01), Schultheis
patent: 4225843 (1980-09-01), Nakamura et al.

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