Optical encoder for disc apparatus

Details Optical encoder for disc apparatus Optical encoder for disc apparatus

1990-01-04

1993-01-12

Wolff, John H.

Dynamic magnetic information storage or retrieval

Record transport with head stationary during transducing

Drum record

360 7703, 360 7704, 360 7811, G11B 555, G11B 2108, G11B 5596

Patent

active

051794853

ABSTRACT:
An optical encoder for a disc apparatus having a head arm to record and reproduce a disc-shaped recording medium, a scale swung together with the head arm, a reticle and a light sensitive element disposed on one side of the scale, and a light emitting element disposed on the other side of the scale. The phases of slit patterns in the reticle and light receiving portions of the light sensitive element opposed thereto are each divided into halves, and the divided phases are distributed symmetrically on the opposite sides of the reticle center in the directions of swing motion of the scale. And the same distributed phases of the light receiving portions are individually connected to each other, thereby eliminating the phase deviation of the detection output that results from temperature fluctuation and so forth.

REFERENCES:
patent: Re32075 (1986-01-01), Harrison et al.
patent: 4396959 (1983-08-01), Harrison et al.
patent: 4516177 (1985-05-01), Moon et al.
patent: 4590527 (1986-05-01), Warner
patent: 4920434 (1990-04-01), Brown et al.
patent: 4974109 (1990-11-01), Hoshimi et al.

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