Optical disk apparatus which changes a tilt value of an...

Details Optical disk apparatus which changes a tilt value of an... Optical disk apparatus which changes a tilt value of an...

2005-01-26

2009-08-04

Feild, Joseph (Department: 2627)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

Reexamination Certificate

active

07570552

ABSTRACT:
During recording with an optical disk apparatus, an objective lens is moved toward the inner circumference and outer circumference of an optical disk in the radial direction thereof and also moved upward and downward, and the quantity of reflected light is measured at that time. Quantities of reflected light are determined taking advantage of the characteristic of laser heat that it is most efficiently used to provide the smallest quantity of reflected light when the relationship between the optical disk surface and the objective lens is closest to perpendicularity and when they are at a distance at which the point in focus is most closely approached. An optimum tilt value and focus position are learned from the result of the determination to allow operations to be performed at the optimum tilt and the optimum position of the point in focus.

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Japanese Office Action dated Oct. 14, 2008 with English Translation thereof.

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