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Light disk device

A technology for an optical disc device and a generating device, which is applied in directions such as optical detectors, optical recording heads, and arrangement/installation of heads, and can solve problems such as deterioration of reading accuracy.

Inactive Publication Date: 2005-11-30
TEAC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, ATIP (address information) obtained from detecting reflected light at the timing of reading power has a problem of so-called deterioration of reading accuracy.

Method used

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Experimental program
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Embodiment Construction

[0045] figure 1 It is a block diagram of an embodiment of the optical disc device of the present invention. exist figure 1 A recording type optical disk 40 such as a CD-R (or CD-RW) is rotationally driven at a constant speed by an unshown spindle motor (Spindle Motor). The optical pick-up head 42 is able to move in the radial direction of the optical disc by using a sled motor (not shown). The optical pickup head 42 is composed of an optical object lens (Lens), an actuator, a 1 / 4 wavelength plate, a collimator lens (CollimatorLens), a beam splitter (Beam Splitter), a light-emitting component (laser diode) and a front monitor Device (Front Monitor), light-receiving components (photodetector) and so on.

[0046] The LD control circuit 44 uses the read power during reproduction or the write power and read power according to the recording pulse during recording (CD-RW is write power, erase power, and read power) to make the optical pickup 42 The laser diode emits light to ou...

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PUM

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Abstract

The present invention is a CD-ROM device. The CD-ROM device includes the first tracking error generation means for generating the first tracking error components from the reflection light detection signal of the main beam while reading power or erasing power; the second tracking error generation means for generating the second tracking error components from the reflection light detection signal of the sub-beam while writing power; and, the subtraction means for subtracting the second tracking error components from the first tracking error components to obtain the tracking error signals during recording. Thus, the invention can use simple structure to reduce the deviation caused by the deflection of optical axis during writing power orresponding to reading power or erasing power; and, during recording, the sequence of reading power can also improve the reading precision of ATIP from the reflection light of the main beam.

Description

technical field [0001] The present invention relates to an optical disc device, and in particular to an optical disc device capable of recording data on an optical disc. Background technique [0002] Recording optical discs can be classified into write-once optical discs and erasable optical discs. The write-once CD-R (Compact Disk Recordable) and the rewritable CD-RW (Rewritable) are provided with guide grooves (Groove). This groove fluctuates (Wobble) (snake) in a very small radius direction at a center frequency of 22.5kHz, and the address information during recording is within a maximum displacement of ±1kHz called Absolute Time In Pregroove (ATIP). Multiple recording is performed by Frequency Shift Keying (FSK) conversion. [0003] The tracking and focusing server (Focus Servo) circuits in the optical disc device that perform the recording and reproduction processing of this recording type optical disc can irradiate light beams onto the optical disc, and use multiple ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G11B7/09G11B7/13G11B7/131
CPCG11B7/094G11B7/0941G11B7/0903G11B7/131G11B7/0943G11B7/0945G11B7/09
Inventor 真下著明
Owner TEAC CORP