Photo detector for a data input device

Details Photo detector for a data input device Photo detector for a data input device

1998-02-20

1999-10-19

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250239, G01D 534

Patent

active

059693444

ABSTRACT:
A photo detector which includes a wheel turned with a revolving shaft, the wheel having a plurality of light permeable portions and light tight portions alternatively arranged around the revolving shaft, a light source controlled to emit light onto the wheel, and a photo receiver element having a set of photo sensor chips adapted to receive light from the light source through the light permeable portions of the wheel, the photo receiver element having at least two sloping surface portions at a light receiving side thereof around each of the photo sensor chips for refracting proximity light to prevent an interference of proximity light.

REFERENCES:
patent: 4948969 (1990-08-01), Yokota

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