Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1994-03-15
1995-01-17
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
2502084, G01V 904
Patent
active
053827910
ABSTRACT:
A dual mode switch for use as a communication aid for the handicapped. The switch can be light activated or around activated, each have a momentary mode and a latching mode. In the momentary mode, the light switch is activated by a given change of impinging light from a first condition to a second condition, and the switch stays on as long as the light remains in the second condition, but turns off when the light returns to the first condition. In the latching mode, the switch stays on even after the light returns to the first condition, and turns off when the impinging light changes again to the second condition. The light switch is activated by moving a hand or other object over a photosensor to block or reduce impinging light, and the switch stays on as long as the hand is over the photosensor, but turns off when the hand is removed. In the latching mode, one pass of the hand turns the switch on, and another pass of the hand turns it off. In the momentary mode of the sound or voice switch, the switch is on only as long as a person keeps talking, and turns off when the person stops talking. In the latching mode, the voice switch stays on after the person stops talking, and turns off when the person starts talking again.
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Leff Aaron N.
Leff Ruth B.
Lee John R.
Nelms David C.
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