Boots – shoes – and leggings
Patent
1994-12-30
1997-03-11
Trammell, James P.
Boots, shoes, and leggings
367907, 345177, G01M 700
Patent
active
056108389
ABSTRACT:
A shift of an input coordinate by a change in temperature in a coordinate input device is prevented. An arithmetic operation and control circuit 1 applies a drive signal to a vibration pen 3 and starts a timer. The drive signal applied to the vibration pen 3 is delayed by a delay circuit 12, which drives a vibrator drive circuit 2 to generate vibration. A delay time of the delay circuit 12 is shortened as a temperature rises and a sum time of the delay generated by the delay circuit 12 and a delay generated in the vibration pen 3 as the temperature changes is constant regardless of the temperature. As a result, a vibration propagation time measured by the timer represents a net propagation time plus a constant delay time regardless of the temperature. Thus, the stable coordinate input is assured regardless of the temperature.
REFERENCES:
patent: 4845684 (1989-07-01), Garwin et al.
patent: 4886943 (1989-12-01), Suzuki
patent: 4931965 (1990-06-01), Kaneko
patent: 5097915 (1992-03-01), Yoshimura et al.
patent: 5352856 (1994-10-01), Tanaka et al.
Patent Abstracts of Japan, vol. 17, No. 419 (P-1585), Aug. 4, 1993 (corresponding to JP-A-05-080920, Apr. 2, 1993).
Research Disclosure No. 30459, Aug. 1989, Havant GB, p. 599.
Kobayashi Katsuyuki
Sato Hajime
Tanaka Atsushi
Tokioka Masaki
Yanagisawa Ryozo
Canon Kabushiki Kaisha
Trammell James P.
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