Sensing stylus position using single 1-D image sensor

Details Sensing stylus position using single 1-D image sensor Sensing stylus position using single 1-D image sensor

1993-12-07

1996-01-16

Chin, Stephen

Telegraphy

Systems

Position coordinate determination for writing

356375, 2502061, G08C 2100, G01B 1114

Patent

active

054849667

ABSTRACT:
An apparatus and method for determining the location of an object in an active area of a first plane. The apparatus includes a first reflecting device, disposed substantially perpendicular to the first plane at a periphery of the active area. The first reflecting device receives a first image of the object from the active area and reflects the first image back toward the active area substantially parallel to the first plane. A second reflecting device, disposed substantially perpendicular to the first plane at a periphery of the active area, receives a second image of the object from the active area and reflects the second image back toward the active area substantially parallel to the first plane. The second reflecting device is disposed at a first angle which is less than one-hundred eighty degrees to the first reflecting device. The angle opens toward the active area and toward a detecting device. The detecting device is disposed in the first plane at a periphery of the active area opposite the first and second reflecting devices. The detecting device receives the first image and the second image and produces a signal indicating the position of the first and second images.

REFERENCES:
patent: 4710760 (1987-12-01), Kasday
patent: 4762990 (1988-08-01), Caswell et al.
patent: 4782328 (1988-11-01), Denlinger
patent: 4873398 (1989-10-01), Hubby, Jr.
patent: 5164585 (1992-11-01), Lieu
Patent Abstracts of Japan, vol. 15, No. 309 (P-1235), 7 Aug. 1991 and JP-A-31 008 603 (Daihatsu Motor Co. Ltd.) 8 May 1991, Abstract Only.

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