Coordinate input apparatus
First Claim
1. A coordinate input apparatus comrising an input board (100) including two optical guide arrays superposed one upon the other with the optical guide channels of one array intersected at right angles with the optical guide channels of the other array, each array having a plurality of paralelly disposed optical guide channels (11, 12), each channel containing an optical scatterer (22);
- a light pen (10) adapted to project a light beam upon said input board;
photo detector (13,
14) disposed to oppose one end surface (11a, 12a) of said respective optical guide channels for detecting scattered light of said projected light beam and propagating through said optical guide channels to convert the detected light into electrical signals; and
an electronic circuit (101) responsive to said electrical signals for producing a binary signal train which determines a coordinate position where said light beam is projected by said light pen.
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Accused Products
Abstract
A coordinate input apparatus. A pair of optical guide channel arrays each including a required number of parallel optical guide channels (11, 12) which contain optical scatterer (22) are superposed to form an input board (100) with the optical guide channels of the two arrays intersected at right angles. Light is detected which is scattered by the optical scatterer (22) in the optical guide channels (11, 12) corresponding to irradiation of one point on the input board by a light pen (10) and reaches end surfaces (11a, 12a) of the optical guide channels. The detected signals are processed to form a binary signal train representative of the coordinate of the light pen (10).
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Citations
17 Claims
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1. A coordinate input apparatus comrising an input board (100) including two optical guide arrays superposed one upon the other with the optical guide channels of one array intersected at right angles with the optical guide channels of the other array, each array having a plurality of paralelly disposed optical guide channels (11, 12), each channel containing an optical scatterer (22);
- a light pen (10) adapted to project a light beam upon said input board;
photo detector (13,
14) disposed to oppose one end surface (11a, 12a) of said respective optical guide channels for detecting scattered light of said projected light beam and propagating through said optical guide channels to convert the detected light into electrical signals; and
an electronic circuit (101) responsive to said electrical signals for producing a binary signal train which determines a coordinate position where said light beam is projected by said light pen. - View Dependent Claims (2, 3, 4)
- a light pen (10) adapted to project a light beam upon said input board;
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5. A coordinate input apparatus comprising a first fiber optic sheet (61) including a plurality of parallelly disposed straight optical guide channels (63), each containing a minute optical scatterer;
- a second fiber optic sheet (62) having the same construction as said first fiber optic sheet and superposed thereon with the optical guide channels of the first and second sheets intersected;
tapered structure fiber optic sheets (66) disposed at the end surface (64) of said first and second fiber optic sheets, each tapered structure fiber optic sheet including tapered optical guide channels with a reduced spacing therebetween;
photo detector element arrays (68A, 68B, 68C, 68D) each including a plurality of photo detector elements disposed to oppose said optical guide channels having reduced spacing of said tapered structure fiber optic sheets;
a light pen (10) for projecting a focussed light beam onto the optical guide channels of said first and second fiber optic sheets; and
a signal generator (SG) responsive to the outputs of said photo detector element arrays for producing an electrical signal corresponding to a coordinate position on which said light beam is projected from said light pen. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
- a second fiber optic sheet (62) having the same construction as said first fiber optic sheet and superposed thereon with the optical guide channels of the first and second sheets intersected;
Specification