Illumination apparatus for a digitizer tablet
First Claim
1. An illumination apparatus for a digitizer tablet which has a hand-held digitizing member and an associated conductor arrangement embedded in the tablet, said apparatus comprising:
- a non-optical-fiber flat light conductor located on top of and covering the conductor arrangement embedded in the digitizer tablet, said non-optical-fiber flat light conductor including a top surface, a bottom surface, and a light-receiving edge, anda light source located peripheral to said non-optical-fiber flat light conductor, said light source providing light to said light-receiving edge of said non-optical-fiber flat light conductor, wherein a portion of light received by said light-receiving edge from said light source is emitted from said top surface for back lighting an object to be digitized that is placed over said non-optical-fiber flat light conductor.
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Accused Products
Abstract
An illumination apparatus is provided for an opaque digitizer tablet. The illumination apparatus can be used to convert the opaque digitizer into a back-lit digitizer. The illumination apparatus includes an aperture fluorescent lamp located peripheral to the portion of the working surface used for placement of the an object to be digitized and includes a non-optical-fiber flat light conductor (a slab waveguide) located on top of and covering the portion of the working surface used for the object to be digitized. Light conducted from the lamp emerges from the top surface of the non-optical-fiber flat light conductor for back lighting the object to be digitized. A reflective surface is located under the non-optical-fiber flat light conductor for reflecting scattered light, that emerges from a bottom surface of the non-optical-fiber flat light conductor, toward the object to be digitized. For optimum back lighting, the bottom surface of the non-optical-fiber flat light conductor includes a pattern of roughened portions which includes a region of lesser roughness nearer to the light source and a region of greater roughness farther from the light source. A panel-shaped optical conveyance is used to convey light from the light source to an edge of the non-optical-fiber flat light conductor. The roughened portions provide a slab waveguide with an imperfect boundary.
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Citations
30 Claims
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1. An illumination apparatus for a digitizer tablet which has a hand-held digitizing member and an associated conductor arrangement embedded in the tablet, said apparatus comprising:
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a non-optical-fiber flat light conductor located on top of and covering the conductor arrangement embedded in the digitizer tablet, said non-optical-fiber flat light conductor including a top surface, a bottom surface, and a light-receiving edge, and a light source located peripheral to said non-optical-fiber flat light conductor, said light source providing light to said light-receiving edge of said non-optical-fiber flat light conductor, wherein a portion of light received by said light-receiving edge from said light source is emitted from said top surface for back lighting an object to be digitized that is placed over said non-optical-fiber flat light conductor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. An illumination apparatus for a digitizer tablet which has a hand-held digitizing member and an associated conductor arrangement embedded in the tablet, said apparatus comprising:
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a light source located peripheral to a portion of a digitizer working surface used for placement of an object to be digitized, wherein said light source is an aperture fluorescent lamp, and a non-optical-fiber flat light conductor located on top of and covering the portion of the working surface used for placement upon of an object to be digitized, wherein said non-optical-fiber flat light conductor includes a bottom surface which includes roughened portions, wherein said non-optical-fiber flat light conductor receives light from said light source, wherein a portion of the light entering said non-optical-fiber flat light conductor undergoes total internal reflection within said non-optical-fiber flat light conductor, and a portion of the light is conveyed in said non-optical-fiber flat light conductor to said roughened portions and is scattered by said roughened portions and emerges from a top surface of said non-optical-fiber flat light conductor, wherein light emerging from said top surface of said non-optical-fiber flat light conductor serves to illuminate, by back lighting, an object to be digitized placed on the top surface of said non-optical-fiber flat light conductor, panel-shaped optical conveyance means for conveying light from said light source to an edge of said non-optical-fiber flat light conductor, wherein said panel-shaped optical conveyance means include a first portion located in a plane of said non-optical-fiber flat light conductor and a second portion located in a plane above said plane of said non-optical-fiber flat light conductor adjacent to said light source, and wherein said panel-shaped optical conveyance means conveys light from said light source, in a plane above said plane of said non-optical-fiber flat light conductor, to an edge of said non-optical-fiber flat light conductor, and a reflective surface located between the working surface of the digitizer tablet and said non-optical-fiber flat light conductor for reflecting scattered light, that emerges from a roughened bottom surface of said non-optical-fiber flat light conductor, toward the object to be digitized.
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26. An illumination apparatus for a digitizer tablet which has a hand-held digitizing member and an associated conductor arrangement embedded in the tablet, said apparatus comprising:
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an aperture fluorescent lamp, and a non-optical-fiber flat light conductor located on top of and covering the conductor arrangement embedded in the tablet, wherein said non-optical-fiber flat light conductor includes a bottom surface which includes roughened portions, wherein said non-optical-fiber flat light conductor receives light from said aperture fluorescent lamp, wherein a portion of the light entering said non-optical-fiber flat light conductor undergoes total internal reflection within said non-optical-fiber flat light conductor, and a portion of the light conveyed in said non-optical-fiber flat light conductor is scattered by said roughened bottom portions, and a reflective surface located beneath said non-optical-fiber flat light conductor for reflecting scattered light, that emerges from the bottom surface of said non-optical-fiber flat light conductor, toward the object to be digitized, such that light emerges from a top surface of said non-optical-fiber flat light conductor, wherein light emerging from said top surface of said non-optical-fiber flat light conductor serves to illuminate, by back lighting, an object to be digitized placed on the top surface of said non-optical-fiber flat light conductor.
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27. An illumination apparatus for a digitizer tablet which has a hand-held digitizing member and an associated conductor arrangement embedded in the tablet, said apparatus comprising:
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an aperture fluorescent lamp and a slab waveguide with an imperfect boundary, said slab waveguide located on top of and covering the conductor arrangement embedded in the tablet, said imperfect-boundary-containing slab waveguide including a top surface, a bottom surface, and a light-receiving edge, wherein a portion of light received by said light-receiving edge from said aperture fluorescent lamp is emitted from said top surface for back lighting an object to be digitized placed over said slab waveguide. - View Dependent Claims (28, 29, 30)
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Specification