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Recording apparatus and recording medium

A technology for recording equipment and recording media, used in data recording, optical recording heads, optical recording carriers, etc.

Inactive Publication Date: 2003-12-24
SONY CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The present invention aims to solve the problems mentioned above

Method used

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  • Recording apparatus and recording medium
  • Recording apparatus and recording medium
  • Recording apparatus and recording medium

Examples

Experimental program
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Embodiment Construction

[0027] Embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0028] First, refer to figure 1 Describe a recording device for recording data on an optical disc.

[0029] The recording apparatus includes an optical disc drive unit 10 which in turn includes a spindle motor 12 and an optical head 20 . The spindle motor 12 rotationally drives the optical disc 11, and the optical head 20 irradiates the optical disc with a laser to record information.

[0030] Such as figure 2 As shown, according to the corresponding optical disc in this embodiment, there is a recording track 11a formed of spiral lands and grooves on the signal recording surface on which information signals are recorded.

[0031] The present embodiment assumes the use of a phase-varying optical disc, and information signals are recorded on the signal recording surface based on phase changes.

[0032] The innermost track radius of the disc is 24.00mm, and ...

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Abstract

There are provided a spindle motor 12, an optical head 20, a high-pass filter 31, low-pass filters 32 and 33, an adder 38, and a PLL 39. The spindle motor 12 rotatively drives an optical disk 11. The optical head irradiates a laser beam onto a target track and both tracks adjacent to the target track on the optical disk 11 and detects a return light from each track. The high-pass filter 31 filters a high-frequency component in a signal used for detecting a return light from a target track in the optical head 20. Each of the low-pass filters 32 and 33 filters a low-frequency component in a signal used for detecting a return light from each of the adjacent tracks. The adder 38 operates output signals from the high-pass filter 31, and the low-pass filters 32 and 33. Based on a signal from the adder 38, the PLL 39 generates a reference signal used as a time reference for generating recording signals. An operation by the adder 38 nullifies a cross modulation component.

Description

technical field [0001] The present invention relates to a recording apparatus for recording information signals on a recording medium and a recording medium for recording information signals. Background technique [0002] Usually, on an optical disc, there are wobbles on the boundary between the land and the groove of the recording track on the signal recording surface, and correspondingly, a recording device matched with the optical disc is also provided. [0003] For example, for music MD or CD-R discs used by computers, the recording equipment scans the grooves of the micro-swing of the disc with a recording beam. [0004] In addition, the recording device uses a frequency filter to electrically separate the wobble frequency content from the tracking guidance signal. The recording device gradually accumulates the wobble frequency component and uses it as a synchronous clock for recording data. [0005] If there are two disc formats with different wobble frequencies, a s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G11B7/09G11B7/0045G11B7/007G11B7/12G11B27/19G11B27/30
CPCG11B27/3027G11B7/0045G11B7/12G11B7/007G11B2220/20G11B2220/216G11B27/19G11B7/09
Inventor 武田立熊井聪小西步铃木润一
Owner SONY CORP