Irregular pattern input device comprising an optical fiber bundl

Details Irregular pattern input device comprising an optical fiber bundl Irregular pattern input device comprising an optical fiber bundl

1994-02-01

1995-06-20

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356 71, 250556, G02B 500, G06K 500

Patent

active

054262968

ABSTRACT:
An irregular pattern input device includes an optical fiber bundle in which an entrance surface and an exit surface are respectively formed at both ends thereof. Lighting means emits irradiation light so as to provide a light pattern according to a convex portion of a subject in contact with the entrance surface, and according to a concave portion of the subject in no contact with the entrance surface. In this case, an angle of incidence of the irradiation light is set to be larger than a critical angle on an interface between a core portion of each optical fiber of the optical fiber bundle and the air. It is thereby possible to provide total reflection on the entrance surface in no contact with the concave portion of the subject, and non-total reflection on the entrance surface in contact with the convex portion of the subject, resulting in reflected light having a light pattern according to an irregular pattern. The resultant light pattern is inputted into photoelectric transforming means through the exit surface, and is transformed into electric information by the photoelectric transforming means.

REFERENCES:
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patent: 5088817 (1992-02-01), Igaki et al.
patent: 5096290 (1992-03-01), Ohta et al.
patent: 5146102 (1992-09-01), Higuchi et al.
patent: 5210588 (1993-05-01), Lee

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