Coordinates input apparatus

Details Coordinates input apparatus Coordinates input apparatus

1987-06-29

1990-06-05

Lall, Parshotam S.

Boots, shoes, and leggings

178 18, 367907, G01B 1700

Patent

active

049319655

ABSTRACT:
A coordinates input apparatus, for example, a digitizer, has a vibration propagation medium such as a transparent glass plate for allowing a vibration to propagate therethrough; an input pen for applying vibration to the vibration propagation medium; a vibration detector for detecting vibration applied by the input pen; an envelope output device for producing an envelope signal representing the envelope of the vibration detected by the vibration detector; a differentiator for conducting a differentiation of the envelope signal produced by the envelope output device so as to determine the peak; a controller adapted for determining, as the time of arrival of the vibration, a zero-cross point of the vibration that is located in the vicinity of a zero-cross point of the signal from the differentiator; and a computing device for computing the distance between the input pen and the vibration detector from the time determined by the controller.

REFERENCES:
patent: 3857022 (1974-12-01), Rebane et al.
patent: 4488000 (1984-12-01), Glenn
patent: 4564928 (1986-01-01), Glenn et al.
patent: 4665282 (1987-05-01), Sato et al.
patent: 4745565 (1988-05-01), Garwin et al.
Japanese Patent Abstracts, vol. 7, No. 113 (P-197)[1258], May 18, 1983.

Affiliated with

Also associated with

Rating

Coordinates input apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Coordinates input apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Coordinates input apparatus will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-496737