Keyboard-compatible optical determination of object's position

Details Keyboard-compatible optical determination of object's position Keyboard-compatible optical determination of object's position

1995-06-07

1998-03-31

Brier, Jeffery

Computer graphics processing and selective visual display system

Display peripheral interface input device

Including keyboard

345170, 345175, G06F 3023

Patent

active

057343756

ABSTRACT:
A method of determining an object's position and associated apparatus provides positional information in a form that may be conveniently communicated to a computer to calculate the object's position. In a preferred embodiment, representatively incorporated in a computer keyboard, a method of determining an object's position includes forming an optical grid of reflected beacons and detecting an obstruction of the reflected beacons. The preferred embodiment apparatus utilizes a single light source and a single light sensor to detect an object's position in two dimensions.

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patent: 4746770 (1988-05-01), McAvinney
patent: 5196835 (1993-03-01), Blue et al.
patent: 5493112 (1996-02-01), Welch
patent: 5565686 (1996-10-01), Welch
Patent Abstracts of Japan, vol. 008, No. 068 (P-264), 30 Mar. 1984 & JP,A,58 213 386 (Pentel KK) 12 Dec. 1983.
IBM Technical Disclosure Bulletin, vol. 014, No. 10, Mar. 1972 New York, US, pp. 3031-3032, XP002016084 R.L. Garvin: "Scanning Light Spot for Stylus Input to a Computer Through a Tablet".

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