Position detection system and projection display system
AssigneeSeiko Epson Corporation
InventorsKanechika Kiyose, Kogo Endo
Life of this patent
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Abstract
An optical position detection system includes a light output unit that outputs lights toward a first detection target and a second detection target, and a first light receiving unit that receives a first reflected light from the first detection target and a second light receiving unit that receives a second reflected light from the second detection target having different wavelengths, wherein the first detection target has a first reflection filter that reflects the first reflected light and the second detection target has a second reflection filter that reflects the second reflected light.
Claims12
A position detection system comprising:
- a light output unit that outputs lights toward a first detection target and a second detection target;
- a light receiving unit that receives lights reflected from the first detection target and the second detection target;
- and
- a position detection unit that detects positions of the first detection target and the second detection target using the lights received by the light receiving unit,
- wherein the first detection target has a first reflection filter that reflects a first reflected light and the second detection target has a second reflection filter that reflects a second reflected light having a different wavelength from that of the first reflected light, and
- the light receiving unit has a first light receiving unit that detects the first reflected light and a second light receiving unit that detects the second reflected light by distinguishing wavelengths of the lights.
Dependencies are inferred from the claim text.