Hologram graphic data tablet apparatus using a vernier

Details Hologram graphic data tablet apparatus using a vernier Hologram graphic data tablet apparatus using a vernier

1976-10-04

1977-10-25

Fears, Terrell W.

Communications: electrical

Digital comparator systems

350315, G02B 2700

Patent

active

RE0294616

ABSTRACT:
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.

REFERENCES:
patent: 3658402 (1972-04-01), Nishida

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