Photo detector for a data input device
OwnerHsin-Te Tsenginventor
Life of this patent
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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.
Claims3
A photo detector comprising a wheel turned with a revolving shaft, said wheel having a plurality of light permeable portions and light tight portions alternatively arranged around said revolving shaft, a light source controlled to emit light onto said wheel, and a photo receiver element having a set of photo sensor chips adapted to receive light from said light source through said light permeable portions of said wheel, wherein said photo receiver element comprises at least two sloping surface portions at a light receiving side thereof around each of said photo sensor chips for refracting proximity light to prevent an interference of proximity light.
Dependencies are inferred from the claim text.