Split type optical pick-up device with a tracking error detector

Details Split type optical pick-up device with a tracking error detector Split type optical pick-up device with a tracking error detector

1988-08-15

1990-12-11

Richardson, Robert L.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

G11B 700

Patent

active

049775529

ABSTRACT:
A split type optical pick-up device suitable for use in an optical disc memory system has a two-part structure: stationary and movable optical systems which are provided separately. The stationary optical system includes a semiconductor laser for emitting a laser beam which is received by a deflecting member of the movable optical system. The thus deflected laser beam is focused onto an optical disc by an objective lens. The light reflected from the optical disc passes through the objective lens in the reverse direction and also through the deflecting member to impinge upon a tracking error detector which is also provided in the movable optical system. The deflecting member has differnt rates of transmission for p and s polarized light for the light reflected from the optical disc such that the s polarized light is reflected toward the stationary optical system as much as possible so as not to waste the s polarized light, which defines a component of an information signal to be reproduced in the stationary optical system. Because of the provision of the tracking error detector in the movable optical system, there will be produced no offset in a tracking signal generated by the tracking error detector, and since the deflecting member reflects the s polarized light as much as possible, there is obtained an enhanced S/N ratio.

REFERENCES:
patent: 4322838 (1982-03-01), Neumann
patent: 4644516 (1987-02-01), Musha
patent: 4688201 (1987-08-01), Towner et al.
patent: 4822139 (1989-04-01), Yoshizuma

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