Position detecting apparatus

Details Position detecting apparatus Position detecting apparatus

1984-02-15

1986-08-26

Evans, F. L.

Optics: measuring and testing

By polarized light examination

With light attenuation

250237G, 340347P, 33125A, G01B 1114

Patent

active

046079564

ABSTRACT:
A position detecting apparatus provided with a photosensor for optically detecting the scale pattern of an optical scale which moves together with the optical head of the optical disk instrument, and generating an analog signal which corresponds to a pitch of the scale graduation. The photosensor has a light receiving surface, whose width is half the pitch of the scale graduation, and the analog signal of the photosensor is converted to digital signals by means of an A/D converter the digital signals corresponding to a pluralty of level signal components of the analog signal. The digital data thus obtained are added or subtracted according to the moving direction of the optical head, thus enabling the position of the optical head to be detected.

REFERENCES:
patent: 4135086 (1979-01-01), Baba
patent: 4409479 (1983-10-01), Sprague et al.
Patent Abstracts of Japan, vol. 2, No. 130, Oct. 28, 1978, p. 7957 E 78.
Roberts, Machine Design, vol. 50, No. 1, Jan. 1978, pp. 104-109.

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