Title:
METHOD AND SYSTEM FOR MEASURING THE DISTANCE FROM A PIEZOELECTRIC ELEMENT
Document Type and Number:
WIPO Patent Application WO2000013039
Kind Code:
A3
Abstract:
A method and system for measuring the distance from a piezoelectric substance (10) by transmitting an electromagnetic pulse (14) to the piezoelectric substance so as to generate an acoustic pulse (15) in response thereto. The acoustic pulse is sensed by an acoustic sensor (12) displaced from the piezoelectric substance by an unknown distance, and a time interval between initiation of the electromagnetic pulse and receipt of the acoustic pulse is measured. The distance between the piezoelectric substance and the acoustic sensor is computed by multiplying the measured time interval by the speed of sound, which is known. Upon striking the piezoelectric surface against a surface a modified echo characteristic of the acoustic pulse may be detected. This allows operation of one of a plurality of switches to be detected. By using multiple sensors, the spatial location of the switch can be computed and this allows the specific switch to be identified in a computer keyboard adapted for use with a computer but not physically connected thereto.
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Inventors:
ANTEBI AMIT (IL)
ATSMON ALON (IL)
ATSMON ALON (IL)
Application Number:
PCT/IL1999/000470
Publication Date:
June 08, 2000
Filing Date:
August 27, 1999
Export Citation:
Assignee:
COMSENSE TECHNOLOGIES LTD (IL)
ANTEBI AMIT (IL)
ATSMON ALON (IL)
ANTEBI AMIT (IL)
ATSMON ALON (IL)
International Classes:
A63H30/02; G01S5/30; G01S11/16; G01S15/10; G01S15/46; G06F3/033; G06F3/043; H01L41/09; (IPC1-7): G01S11/16; G01S15/02; G06F3/033; G06K11/14; G06K11/16
Foreign References:
| US4935907A | 1990-06-19 | |||
| US5717168A | 1998-02-10 | |||
| US5646907A | 1997-07-08 |
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