Method for setting the loop gain in a focusing servo loop

Details Method for setting the loop gain in a focusing servo loop Method for setting the loop gain in a focusing servo loop

1989-08-28

1993-02-16

Psitos, Aristotelis

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4434, 369 4435, 369 58, G11B 709

Patent

active

051876965

ABSTRACT:
A method for setting the loop gain in a focusing servo loop of a disc player. The loop is opened and the objective lens is moved repeatedly up and down about the focusing point while the disc is slowly rotated, thereby generating an S-shaped focusing error curve. The S-shaped error curve is sampled and a loop gain is determined based on the sampled values. If an eject instruction occurs during the loop gain setting process, a braking pulse is applied to a spindle motor for stopping the disc rotation.

REFERENCES:
patent: 5010538 (1991-04-01), Takeda et al.

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