Optical disc device

Abstract

The invention provides an optical disc device. In the focus balance adjustment for an unrecorded disc, the focus balance adjustment is performed even if no data is recorded on the disc, and high-quality data is recorded. As a signal obtained from the optical disc other than the playback signal, a track tracking position error signal that can be detected when the focus of the irradiated laser light coincides with the optical disc (1) and cannot be detected when the focus is not matched is used to set the track generated by detection. The maximum amplitude measuring device (7) of the amplitude level of the tracking position error signal adjusts the focus balance of the unrecorded disc so that the amplitude of the tracking position error signal becomes the maximum.

Description

technical field [0001] The present invention relates to an optical disc device, and more particularly to an attempt to improve focus balance adjustment for an unrecorded optical disc. Background technique [0002] As a method of focusing balance adjustment on an optical disc on which data has already been recorded, high-precision focus balance adjustment is performed by using a reproduction signal obtained using the optical disc, or the like. The signal quality of the playback signal can be improved through the above adjustment. [0003] However, in an optical disc on which no data has been recorded (unrecorded disc), since a reproduced signal cannot be obtained using the optical disc, the above-mentioned balance adjustment method cannot be performed. Therefore, as a focus balance adjustment method for an unrecorded disk, the following method is considered. [0004] In a general unrecorded disk, the guide grooves constituting the recording track meander at a predetermined ...

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Problems solved by technology

[0006] Conventional optical disc devices are structured as described above. When adjusting the focus balance on an unrecorded disc, no data is recorded on the optical disc, and the focus balance adjustment using the reproduced signal cannot be performed.

Therefore, since high-quality data cannot be recorded, by using the method of adjusting the focus balance based on the meander component introduced in the above-mentioned Patent Document 1, the focus balance adjustment can be performed on an unrecorded disk, and high-quality data can be recorded. In addition, a circuit that detects the meander extension period component is required, and there is a problem that the scale of the circuit increases.

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