Optical disc device

An optical disc device, optical disc technology, applied in the directions of configuration/installation of heads, recording/reproducing by optical methods, instruments, etc., can solve the problem of increased circuit scale, no data recorded on optical discs, and inability to perform focus balance adjustment using playback signals and other problems, to achieve the effect of simple structure, focus balance adjustment, and cost reduction

Inactive Publication Date: 2005-06-15
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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.

Method used

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no. 1 example

[0040] First, an optical disc device according to a first embodiment of the present invention will be described with reference to the drawings.

[0041] figure 1 A configuration example of the optical disc device according to the first embodiment of the present invention is shown. exist figure 1 Among them, 1 is a disc, 2 is a spindle motor for rotating the disc 1, 3 is a wave picker for reading and writing information on the surface of the disc 1, 4 is a photodetector for detecting the signal of the optical pickup 3, and 5 is an optical pickup. The track tracking position error signal generation device that generates the error signal of the track tracking position based on the signal of the detector 4, and the focus position 6 that generates the error signal of the focus position of the optical pickup 3 based on the signal of the photodetector 4 The error signal generation device, 7 is the maximum amplitude measurement device based on the disc rotation signal for measuring ...

no. 2 example

[0053] Next, an optical disc device according to a second embodiment of the present invention will be described with reference to the drawings.

[0054] FIG. 3 shows a configuration example of an optical disc device according to the second embodiment. In FIG. 3, the figure 1 The same symbols represent the same or equivalent parts, and figure 1 The difference of the shown structure is that a track crossing signal generation device 10 that generates a track crossing signal based on the signal from the photodetector 4 is newly installed; The maximum amplitude measuring device 11 of the maximum amplitude;

[0055] In this embodiment, the measurement of the maximum amplitude of the track tracking position error signal is performed as in the first embodiment, but it is different from the first embodiment in that a track crossing signal generated by reflected light passing through the track is used.

[0056] Specifically, if the focal point toward the disk is matched even if the ac...

no. 3 example

[0064] Next, an optical disc device according to a third embodiment of the present invention will be described with reference to the drawings.

[0065] Figure 5 shows an example of the configuration of the optical disc device according to the third embodiment, in Figure 5 3, the same symbols as in FIG. 3 denote the same or equivalent parts. The difference from the second embodiment shown in FIG. Whether the frequency of the signal is within the frequency range set by the frequency setting device 14 is used to detect the frequency detection device 13, and the frequency detection signal obtained by using the frequency detection device 13 is input to the maximum amplitude measuring device 15 based on the frequency detection signal.

[0066] In this third embodiment, the measurement of the maximum amplitude of the track tracking position error signal is performed as in the above-mentioned embodiments, but it is different from the embodiments in that the frequency of the track c...

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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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B7/085G11B7/00G11B7/09
CPCG11B7/0945G11B7/0917
Inventor 山根秀明
Owner PANASONIC CORP
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