Optical coordinate input device comprising few elements
First Claim
1. An input apparatus of computerized device for measuring an object'"'"'s relative location within a predefined measurement space wherein said apparatus is positioned at a single viewing point, said apparatus is comprised of:
- a. at least one light emitting source transmitting light extending over said predefined measurement space;
b. a light-receiving unit comprised of at least two photo sensing units for receiving scattered light rays from the object wherein said photo sensing units are placed at far edges of said apparatus creating an optimal viewing angle in relation to the measurement space;
c. at least two lenses positioned in front of said photo sensing units for condensing said scattered light rays;
d. a spectrum filter positioned in the route of said light rays wherein said spectrum matches the light spectrum emitted from said light sources;
wherein the location of the object is calculated using trigonometric and statistical methods on the basis of received light intensity and analysis of differences between at least two captured light images, said differences effected from different viewing angles.
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Abstract
The present invention is an optical electronic input device for identifying the coordinates of an object in a given area. The device may capture two-dimensional or three-dimensional input information, using a minimal number of optical units (one for two dimensional coordinates and two for three dimensional coordinates). The invention requires only basic optical elements such as a photo sensing unit, lenses, a light source, filters and shutters which may reduce manufacturing costs significantly. Since this device enables inputting the coordinates of an object in a set area, it may not only be used in systems such as optical touch screens, but also in virtual keyboard applications and in implementation for machine vision.
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Citations
74 Claims
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1. An input apparatus of computerized device for measuring an object'"'"'s relative location within a predefined measurement space wherein said apparatus is positioned at a single viewing point, said apparatus is comprised of:
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a. at least one light emitting source transmitting light extending over said predefined measurement space; b. a light-receiving unit comprised of at least two photo sensing units for receiving scattered light rays from the object wherein said photo sensing units are placed at far edges of said apparatus creating an optimal viewing angle in relation to the measurement space; c. at least two lenses positioned in front of said photo sensing units for condensing said scattered light rays; d. a spectrum filter positioned in the route of said light rays wherein said spectrum matches the light spectrum emitted from said light sources; wherein the location of the object is calculated using trigonometric and statistical methods on the basis of received light intensity and analysis of differences between at least two captured light images, said differences effected from different viewing angles. - View Dependent Claims (2, 3, 4, 9, 13, 16, 18, 20, 25, 26, 27, 28, 34, 36, 37, 41, 55, 74)
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5-8. -8. (canceled)
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10-12. -12. (canceled)
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14-15. -15. (canceled)
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17. (canceled)
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19. (canceled)
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21-24. -24. (canceled)
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29-33. -33. (canceled)
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35. (canceled)
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38-40. -40. (canceled)
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42. Apparatus providing input to a computing device, the apparatus comprising:
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a. a housing; b. at least one imaging device within said housing to provide output to said computing device, each said imaging device having more than one imaging area thereupon; and c. an optical system within said housing to define each said imaging area to view an area to be used by a user. - View Dependent Claims (44, 45, 51, 54, 63, 66)
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43. (canceled)
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46-50. -50. (canceled)
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52-53. -53. (canceled)
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56-62. -62. (canceled)
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64-65. -65. (canceled)
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67-73. -73. (canceled)
Specification