Device for scanning optical record carrier

Device for scanning optical record carrier

  • CN 1,275,230 A
  • Filed: 06/03/1999
  • Published: 11/29/2000
  • Est. Priority Date: 06/15/1998
  • Status: Abandoned Application
First Claim
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1. device that is used to scan the optical record carrier of the mark that has the available optical mode detection that distributes along recording channel on it, this device comprises a radiation source that is used for radiation beams, be used for radiation beam is directed to a objective system on the said record carrier, with a radiation-sensitive detection system that is used for from said record carrier received radiation, said detection system comprises at least two detecting devices that are arranged on the both sides, separatrix, each appliance is useful on an output terminal that produces detector signal, this device also comprises an electronic circuit that is used for generating according to said detector signal focus error signal, it is characterized in that said electronic circuit be used for determining detector signal and said radiation beam by have in one first scope spatial frequency with have at one different, mistiming between the relevant appropriate section of a plurality of indicia distribution patterns of the spatial frequency in second scope or phase differential and generate said focus error signal according to said mistiming or phase differential.

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