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

1997-03-20

1999-06-01

Hofsass, Jeffrey A.

Computer graphics processing and selective visual display system

Display peripheral interface input device

Including keyboard

345170, 345175, 178 18, 250224, 340712, 341 31, 356375, G06F 3023

Patent

active

059092106

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 Abstracts of Japan, vol. 008, No. 068(p. 264), Mar. 30, 1984.
R.L.Garvin: "Scanning Light Spot for Stylus Input to a Computer Through a Tablet" IBM Technical Disclosure Bulletin, vol. 14, No. 10, Mar. 1972, pp. 3031-3032.

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