Ultrasonic length measuring apparatus and method for...

Details Ultrasonic length measuring apparatus and method for... Ultrasonic length measuring apparatus and method for...

2005-09-13

2005-09-13

Hoff, Marc S. (Department: 2857)

Data processing: measuring, calibrating, or testing

Measurement system in a specific environment

Electrical signal parameter measurement system

C073S001820, C178S018040

Reexamination Certificate

active

06944557

ABSTRACT:
An ultrasonic length measuring apparatus measures the number of times a waveform of an ultrasonic wave signal crosses a threshold value, detects the crossing timing at, for example, a waveform having a maximal amplitude after a predetermined number of times counting from a first crossing point, measures the time period from the transmission start of the ultrasonic wave by the transmission unit to the detected crossing timing and calculates the length based on the time measured. A coordinate inputting apparatus includes a pen for transmitting an ultrasonic wave and a coordinate inputting apparatus for inputting coordinate positions of the pen based on a propagation time of the ultrasonic wave transmitted by the pen and received by a plurality of ultrasonic wave receivers. The receiver includes at least a pair of ultrasonic receivers for receiving the ultrasonic wave transmitted by the pen.

REFERENCES:
patent: 3692936 (1972-09-01), Moffitt
patent: 5637839 (1997-06-01), Yamaguchi et al.
patent: 5760346 (1998-06-01), Kobayashi et al.
patent: 6041284 (2000-03-01), Yoshimura et al.
patent: 6288711 (2001-09-01), Tanaka et al.
patent: 6338028 (2002-01-01), Shelton et al.
patent: 6356854 (2002-03-01), Schubert et al.
patent: 6484118 (2002-11-01), Govari

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