Control apparatus

Details Control apparatus Control apparatus

1991-10-17

1994-09-13

Pascal, Leslie

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359147, 359169, 250221, H04B 1000

Patent

active

053473868

ABSTRACT:
Solid state optoelectronic control apparatus responsive to manual stimulus is presented. The control apparatus comprises: a transmitter (20) having a light source (38) for projecting a beam of light along a path normally directed away from a photo sensitive detector (24); characterised in that the control apparatus further comprises: a receiver (21) for generating an enable pulse having a duration determined by a length of time for which the beam is reflected towards the detector by a digit or similarly reflective article; and conversion means (31) for varying an output signal level (44) as a function of the duration of the enable pulse. The conversion means increases the signal level (44) in response to and during a first enable pulse, and decreases the signal level in response to and during a second enable pulse occurring next to the first enable pulse. In a preferred example of the present invention, the conversion means (31) further decreases the signal level during the first enable pulse when the signal level (44) reaches a maximum value, and increases the signal level (44) during the second enable pulse when the signal level (44) reaches a minimum value.
In a display device (10) having a display screen (12) mounted in a bezel (11) and further comprising control apparatus of the present invention, the light source (38), the detector (24 ) and a visible light emitting power on indicator (113) are directed towards an aperture (112) in the bezel (11) by a translucent light guide (100).

REFERENCES:
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patent: 4527197 (1985-07-01), Nolte
patent: 4650986 (1987-03-01), Maile
patent: 4727593 (1988-02-01), Goldstein
patent: 4964693 (1990-10-01), Branan
patent: 5281808 (1994-01-01), Kunkel
Sheiner, "Direct Conversion of Sound Waves to Light Waves Using Interferometric Techniques", IBM Tech. Disclosure, vol. 22, #1, Jun. 1979.

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