OPTICAL POSITION DETECTION DEVICE AND APPARATUS WITH POSITION DETECTION FUNCTION
First Claim
1. An optical position detection device that detects a position of a target object, comprising:
- plural detection light sources that output detection light;
a light source drive unit that drives the plural detection light sources;
a first light receiving unit that receives the detection light reflected by the target object located in an output space of the detection light;
a compensation light source unit that outputs compensation light that remains outside the output space;
a second light receiving unit that receives the compensation light; and
a position detection unit that detects the position of the target object based on a first difference between first received light intensity in the first light receiving unit and second received light intensity in the second light receiving unit.
2 Assignments
0 Petitions
Accused Products
Abstract
An optical position detection device that detects a position of a target object, includes plural detection light sources that output detection light, alight source drive unit that drives the plural detection light sources, a first light receiving unit that receives the detection light reflected by the target object located in an output space of the detection light, a compensation light source unit that outputs compensation light that enters outside the output space, a second light receiving unit that receives the compensation light, and a position detection unit that detects the position of the target object based on a difference between first received light intensity in the first light receiving unit and second received light intensity in the second light receiving unit.
6 Citations
10 Claims
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1. An optical position detection device that detects a position of a target object, comprising:
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plural detection light sources that output detection light; a light source drive unit that drives the plural detection light sources; a first light receiving unit that receives the detection light reflected by the target object located in an output space of the detection light; a compensation light source unit that outputs compensation light that remains outside the output space; a second light receiving unit that receives the compensation light; and a position detection unit that detects the position of the target object based on a first difference between first received light intensity in the first light receiving unit and second received light intensity in the second light receiving unit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An optical position detection apparatus that detects a position of a target object, comprising:
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plural detection light sources that output detection light; a light source drive unit that drives the plural detection light sources; a first light receiving unit that receives the detection light reflected by the target object located in an output space of the detection light; a compensation light source unit that outputs compensation light having weaker intensity than that of the detection light; a second light receiving unit that receives the compensation light; and a position detection unit that detects the position of the target object based on a difference between first received light intensity in the first light receiving unit and second received light intensity in the second light receiving unit.
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Specification