Optical position input device

Details Optical position input device Optical position input device

1987-08-10

1989-01-31

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

341 5, G01V 904

Patent

active

048017973

ABSTRACT:
An optical position input device wherein an influence of disturbant light can be practically eliminated. The device includes a large number of light emitting elements and a large number of light receiving elements arranged in an opposing relationship along two sides and the other two sides, respectively, of directions of the X- and Y-axes. During driving scanning of the light emitting elements and the light receiving elements in the direction of the X-axis, a light reception signal developed in response to incident disturbant light from a selected one of the light receiving elements in the direction of the Y-axis is stored into a memory, and then the light reception signal is subsequently read out from the memory and is subtracted on a subtractor from a light reception signal developed from a light receiving element selected upon driving scanning for the direction of the Y-axis. The subtractor thus provides a position signal from which an influence of disturbant light has been eliminated assuredly. An influence of disturbant light is eliminated in a similar manner from a light reception signal developed from a light receiving element in the direction of the X-axis.

REFERENCES:
patent: 4313109 (1982-01-01), Funk et al.
patent: 4652741 (1987-03-01), Golborne

Affiliated with

Also associated with

Rating

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

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

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-178831