Coded data generation or conversion – Digital pattern reading type converter – Optical
Patent
1998-02-10
2000-04-25
Williams, Howard L.
Coded data generation or conversion
Digital pattern reading type converter
Optical
25023113, H03M 100, G01D 534
Patent
active
060549386
ABSTRACT:
A detecting unit provided with an optical system is disposed away from a control unit formed by an electric circuit and an optical transmission/receiving means, and the detecting unit and the control unit are coupled through a transmission optical fiber. The control unit transmits to the detecting unit through the optical fiber a light wave which was subjected to the intensity modulation by a sinusoidal wave of a predetermined frequency. The transmitted light wave is branched into at least two branched optical paths within the detecting unit thereby to perform the phase modulation as to the respective light waves. The light waves passed through the respective branched optical paths are subjected to the phase modulation by the sinusoidal waves which differ in phase 1/4 period by 1/4 period from one another according to a position on a straight line or a rotation angle of a subject to be detected. Then, the light waves thus subjected to the intensity modulation are coupled to a single transmission optical fiber through the branched optical paths and transmitted to the control unit through the transmission optical fiber. In the control unit, the modulated light wave is received and subjected to the phase detection, thereby to calculate and output the position and the rotation angle in accordance with the phase modulation amount of the received light wave.
REFERENCES:
patent: 4958072 (1990-09-01), Hofler et al.
patent: 5288995 (1994-02-01), Strachan
Nakajima Hajime
Nakashima Toshiro
Oka Toru
Shikai Masahiro
Takashima Kazuo
Mitsubishi Denki & Kabushiki Kaisha
Williams Howard L.
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