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Data search method for high-density disk

A search method, high-density technology, applied in the field of data search, which can solve problems such as requiring a lot of time

Inactive Publication Date: 2008-09-17
LEJIN GUANGDIAN ELECTRONIC CO LTD SHANGHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this case, in order to move the optical pickup to the target position again, it is necessary to compare the current position of the optical pickup with the target position, and recalculate the movement amount of the optical pickup, so when moving the optical pickup to the desired target position, it takes a lot of time

Method used

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  • Data search method for high-density disk
  • Data search method for high-density disk
  • Data search method for high-density disk

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Embodiment Construction

[0036] image 3 is a schematic diagram of components of an optical disc storage device in a specific embodiment of the present invention, such as image 3 As shown, the high-density optical disk device 100 of the present invention includes the following parts: add error correction code (ECC) in the input digital data, and convert it into digital storage signal processing device 110a of storage format; will be converted into The numerical value of the storage format is converted into the channel bit encoder 115 of the bit data stream again; The optical drive device 120 of the light quantity drive signal corresponding to the signal output by the channel bit encoder 115; the light quantity drive signal is stored in the high-density optical disc (hereinafter referred to as optical disc) 100a, or utilize reflected light to read the optical pick-up (P / U) 125 of storage signal from optical disc 100a; The sliding (sled) motor 130 that optical pick-up 125 is moved to optical disc 100a ...

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Abstract

The invention relates to a method of searching for data on high density compact discs with different magnetic track screw pitches and sector lengths. The method of searching for data of the invention is characterized in following: corresponding to a data searching order; comparing a current address value and a target address value of an optical pickup unit with a first and a second critical address value of which the magnetic track screw pitch is changed; determining if a current position and a target position of the optical pickup unit are in the different magnetic track screw pitch areas; moving the optical pickup unit to the target position via a position corresponding to the first critical address value or the second critical address value if the current position and the target position of the optical pickup unit are in the different magnetic track screw pitch areas. According to the invention, when searching for data on the high density compact discs with different magnetic screw pitches and sector lengths, the optical pickup unit can be moved to the target position quickly and exactly.

Description

technical field [0001] The invention relates to a data search method on a high-density optical disc, in particular to a data search method on a high-density optical disc with different track pitches and sector lengths. Background technique [0002] In general, optical storage media for storing digital audio and video data include CDs and DVDs, and recently, high-density optical discs capable of storing large-capacity high-quality video data and high-quality audio data, such as Blu-ray Discs (BD: Blu-ray Discs). -ray Disc) and other specifications are being rapidly formulated. [0003] As a new type of optical storage medium, BD uses a blue laser with a shorter wavelength of 405nm than DVD, which uses a red laser with a wavelength of 650nm, and uses an object lens with a numerical aperture (NA: NUMERICAL APERTURE) of 0.85. An optical disc structure with a track pitch (about 0.32 μm) and a storage layer of 0.1 mm that is half the size of CDs and DVDs. Therefore, for BD, it c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B7/13G11B7/085
Inventor 鱼尚竣
Owner LEJIN GUANGDIAN ELECTRONIC CO LTD SHANGHAI