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US RE29,461 EGranted
Hologram graphic data tablet apparatus using a vernier
AssigneeNippon Electric Co., Ltd.
InventorsMasahiro Moriwaki, Mitsuhito Sakaguchi, Yoshinari Mita
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AssigneeNippon Electric Co., Ltd.
InventorsMasahiro Moriwaki, Mitsuhito Sakaguchi, Yoshinari Mita
Estimating the term…
A hologram graphic tablet apparatus is described which has an improved resolution. The apparatus includes a hologram plate which includes a plurality of mini-holograms having position code data therein. The hologram plate is sequentially illuminated by a reference laser and an array of vernier lasers. The light from the laser that is diffracted by the mini-holograms is detected to form a reconstructed image of the position data, and the detected information is processed to produce a positional code that has a greater number of bits, and hence greater position resolution, than that directly obtained from the mini-hologram, depending on whether the output codes from the detector are the result of irradiation of the mini-hologram by the reference laser or by the vernier laser array.
A hologram graphic data tablet apparatus comprising a hologram plate having a plurality of position-representing mini-holograms recorded thereon, a reference laser, an array of n or (n-1) vernier lasers arranged at an interval of (n-1)/n of the width of one of said mini-holograms, means for energizing said reference and said vernier lasers in a predetermined time sequence, means for detecting the light rays emitted by said lasers and diffracted at said mini-holograms forming a reconstructed image, and means for processing the output of said detecting means to produce a positional code having a greater number of bits than the positional code obtained directly from said mini-holograms depending on whether the output codes from said detecting means are the result of irradiation by said reference laser or by said vernier laser array.
A hologram graphic data tablet apparatus comprising a hologram plate having a plurality of position-representing and boundary region-discriminating mini-holograms recorded thereon in columns and lines, an optical scanning member having an array of n first lasers arranged at an interval of (n-1)/n of one mini-hologram and a second laser disposed in the middle of a preselected pair of said first lasers, a drive circuit for energizing said first and second lasers in a predetermined time sequence, a counter circuit for indicating which one of said lasers is energized, first means for detecting a first reconstructed holographic image created by the irradiation by said lasers of said mini-holograms for determining the positional data recorded in the irradiated mini-hologram, second means for detecting a second reconstructed holographic image in a manner similar to said first detecting means for determining the adjacent-mini-hologram discriminating data, and means for comparing the intensities of two reconstructed images for discriminating adjacent mini-holograms from each other on each orthogonal coordinate, whereby the positional data and the adjacent-mini-hologram discriminating data are generated from the mini-hologram for obtaining a positional code with enhanced resolving power.
Dependencies are inferred from the claim text.