Optical position detecting unit and optical coordinate input uni

Details Optical position detecting unit and optical coordinate input uni Optical position detecting unit and optical coordinate input uni

1994-03-22

1996-03-12

Gonzalez, Frank

Optics: measuring and testing

By polarized light examination

With light attenuation

2502221, 250237R, G01B 1114, H01J 4014

Patent

active

054990980

ABSTRACT:
An optical position detecting unit comprising: a light-receiving device including a pixel array to form a light-receiving region and for outputting signals with respect to light detected by respective pixels in the pixel array; a pattern member disposed in the front of the light-receiving region of the light-receiving device and having a pattern having a characteristic that an image of the pattern projected onto the light-receiving region by an incident light beam determines the direction of incidence of the light beam univocally; and a signal processing device for extracting information with respect to the direction of incidence of the light beam on the basis of the signals outputted from the respective pixels in the pixel array. The pattern preferably has M-sequence characteristic. Further, an optical coordinate input unit is realized by using: a coordinate detector formed by using at least two optical position detecting units of the type as described above; and a position pointer including a light-emitting portion.

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