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Tracking balance correction apparatus

A technology of balance correction and tracking error, applied in the direction of head configuration/installation, instrumentation, data recording, etc.

Inactive Publication Date: 2003-06-25
SAMSUNG ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, there is also the disadvantage that the tracking balance cannot be corrected solely based on the phase difference of the diagonally summed signal

Method used

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Embodiment Construction

[0014] Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0015] taking into account if Figure 1B The envelope of the high-frequency playback signal detected by the disc in the case shown is smaller than Figure 1A The envelope of the high-frequency playback signal detected by the optical disk in the case shown, the present invention can more accurately correct the tracking balance.

[0016] see figure 2 , according to the optical disk system of an embodiment of the present invention, has adopted tracking balance correction device, is used for irradiating the laser beam on the optical disk 21, and produces the radio frequency signal (RF) of a high-frequency replay signal, and it comprises a pick-up circuit 22 , the pick-up circuit 22 includes a quartered photodetector (not shown), and the detector receives the reflected light from the optical disc 21 . Connected to the output of the pickup circuit...

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Abstract

A tracking balance correction apparatus includes a pickup unit which detects a beam reflected from an optical disc and outputs a high frequency reproduction signal and diagonal summing signals, a tracking balance correction unit which receives the diagonal summing signals output from the pickup unit, adjusts phases of the received diagonal summing signals to detect a differential phase, generates and outputs the detected differential phase as a tracking error signal, an envelope detection unit which detects an envelope of the RF signal output from the pickup unit to output an envelope signal, and a digital signal processor which receives the tracking error signal from the tracking balance correction unit, generates a tracking drive voltage to set the tracking error signal to zero, and controls tracking of the pickup unit, and at the same time generates a tracking balance correction voltage according to a maximum magnitude of the envelope signal input from the envelope detection unit, to then output the generated voltage to the tracking balance correction unit.

Description

technical field [0001] The present invention relates to an optical disc system, more specifically, a tracking balance correction device for an optical disc system, which uses a tracking servo method for obtaining a tracking error signal through phase difference detection. Background technique [0002] An optical disc system irradiates an optical disc with laser light, detects reflected light from the disc surface on which information is recorded, and reproduces a signal using the detected light. A digital versatile disc (DVD) or compact disc (CD) records information in a cavity called a pit. Therefore, when controlling the tracking servo to accurately track the laser beam on successive pits, the optical disc system should adjust the tracking balance so that the laser beam is positioned at the center of the pit. The technology related to tracking balance in the prior art has been disclosed in Korean Patent Application No. 96-51271. [0003] This application discloses a meth...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G11B17/34G11B7/09
CPCG11B7/094G11B7/0901G11B17/34
Inventor 黄龙夏
Owner SAMSUNG ELECTRONICS CO LTD