Coordinates detection apparatus
First Claim
1. A coordinates detection apparatus comprising:
- a display surface;
two optical units provided at different positions on the border of said display surface, each of said optical unit having a light emitter, a diffusion lens, a read lens, and a light-receiver; and
a recursive reflection section located at the border of said display surface and which reflects a light emitted from said light-emitter and diffused by said diffusion lens in a fan form towards said light-emitter;
wherein said light-emitter and said light-receiver are so located that their optic axes are coincident, wherein the coordinates of a point specified on said display surface are detected by focusing the light reflected on said reflection section with said read lens, receiving the reflected light with said light-receiver, and determining the position where reception of the light is hindered.
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Accused Products
Abstract
A coordinates detection apparatus comprises two optical units each having a light emitter, a diffusion lens, a read lens, and a light-receiver. The optical units are provided at different positions on the border of a display surface. The light-emitter and light-receiver in each optical unit are so located that their optic axes are coincident. A recursive reflection section reflects the light emitted from the light-emitter and diffused by the diffusion lens in a fan form towards the light-emitter. The coordinates of a point specified on the display surface are detected by focusing the light reflected on the reflection section with the read lens, receiving the reflected light with the light-receiver, and determining the position where reception of the light is hindered.
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Citations
9 Claims
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1. A coordinates detection apparatus comprising:
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a display surface;
two optical units provided at different positions on the border of said display surface, each of said optical unit having a light emitter, a diffusion lens, a read lens, and a light-receiver; and
a recursive reflection section located at the border of said display surface and which reflects a light emitted from said light-emitter and diffused by said diffusion lens in a fan form towards said light-emitter;
wherein said light-emitter and said light-receiver are so located that their optic axes are coincident, wherein the coordinates of a point specified on said display surface are detected by focusing the light reflected on said reflection section with said read lens, receiving the reflected light with said light-receiver, and determining the position where reception of the light is hindered. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
a mounting position adjustment mechanism which adjust a mounting position of said optical unit.
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8. The coordinates detection apparatus according to claim 1, wherein said light emitted from said light-emitter and diffused by said diffusion lens is parallel to said display surface.
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9. The coordinates detection apparatus according to claim 1, wherein said light emitted from said light-emitter and diffused by said diffusion lens is parallel to the reflected light.
Specification