Title: Ultrasonic transmitter for the remote control of radio and television receivers

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Claims: What is claimed is:

1. An ultrasonic frequency transmitter for remote control devices, comprising:

an electrostatic transducer;

a source of d.c. voltage connected in parallel with the electrostatic transducer;

a controllable electronic switch connected across said electrostatic transducer for periodically shorting said transducer; and

an a.c. voltage generator connected to said electronic switch for controlling said switch so that said transducer transmits a desired ultrasonic frequency.

2. An ultrasonic transmitter as described in claim 1, wherein the frequency of the a.c. voltage generator may be varied.

3. An ultrasonic transmitter as described in claim 1, wherein the a.c. voltage generator comprises an oscillator and at least one frequency divider for providing a plurality of a.c. frequencies for controlling the electronic switch.

4. An ultrasonic transmitter as described in claim 3, additionally comprising switch means for selectively connecting the a.c. frequencies from the oscillator and frequency divider to the electronic switch.

5. An ultrasonic transmitter as described in claim 4, wherein the switch means is an electronic switch.

6. An ultrasonic transmitter as described in claim 1, wherein the a.c. voltage generator comprises a bistable multivibrator having an output for controlling the controllable electronic switch.

7. An ultrasonic transmitter as described in claim 6, wherein the frequency of the multivibrator is variable.

8. An ultrasonic transmitter as described in claim 6, additionally comprising a plurality of frequency controlling elements and switch means for connecting selected ones of said frequency controlling elements to said multivibrator for controlling the frequency thereof.

9. An ultrasonic transmitter as described in claim 8, wherein the switch means comprises finger touch electrodes.
Other info:

Inventors: Schroder, Wolfgang (Pforzheim, DT)

Application Number: 474455
Filing Date: 1974-05-29
Publication_date: 1976-02-10
Assignee: International Standard Electric Corporation (New York, NY)
Primary Class(es): 367/197
Other Classes:
US Patent Ref:

3009099	Nov, 1961	Muller	340/384.
3103664	Sep, 1963	Hooper	178/DIG.
3180199	Apr, 1965	Anderson	340/384.
3430230	Feb, 1969	Jones	340/384.
3440648	Apr, 1969	Camenzind	340/388.
3603985	Sep, 1971	Goralnick	340/384.
3678392	Jul, 1974	Houghton	340/171.
3747108	Jul, 1973	Ringer	340/171.
3846792	Nov, 1974	Haigh	340/384.

Other Refs:
Primary Examiner: Pitts, Harold I.
Assistant Examiner:
Attorney: O'Halloran; John T., Lombardi, Jr.; Menotti J., Van Der Sluys; Peter