Method and apparatus for identifying optical record medium type

Abstract

A method and an apparatus for identifying the type of an optical recording medium are provided. The method includes detecting a surface reflected signal SS and a writable-surface reflected signal SR of an optical recording medium while performing a focus search using a first optical system, counting a time difference DTS between a high peak and a low peak of the surface reflected signal SS, counting a time difference DTR between the high peak of the surface reflected signal and a high peak of the writable-surface reflected signal SR, obtaining DT by substituting DTR and DTS into the following equation: DT=(DTR) / (DTS) (a-b>=1 / 2) and comparing DT with a reference time T, and driving the first optical system if DT is greater than T and driving a second optical system if DT is not greater than T.

Description

[0001] This application claims priority from Korean Patent Application No. 2002-23830 filed in the Korean Intellectual Property Office on April 30, 2002, which is hereby incorporated by reference in its entirety. technical field [0002] The present invention relates to a method and a device for identifying the type of an optical recording medium, in particular to a method and a device for identifying the type of an optical recording medium using a predetermined optical system. Background technique [0003] Generally, optical recording media, ie, optical discs, are classified into ROM-type optical discs, write-once optical discs, and rewritable optical discs according to whether or not they can be recorded and the number of times they can be recorded. [0004] In addition, such optical discs are generally classified into compact discs (CDs), digital versatile discs (DVDs), and next-generation DVDs according to their storage capacity. A CD has a storage capacity of 650MB, and...

AI Technical Summary

Problems solved by technology

Also, in the 12th test, the DT values ​​of CD and DVD were 80s and 95s respectively, which are very close to each other, so it is not easy to judge the type of optical recording media based on their DT values

[0009] However, in the case where there is a non-linear drive region in an optical disc that can hardly maintain the linearity of the actuator, it is difficult to judge what type the optical disc is using the conventional method for identifying the type of optical recording medium.

In such a non-linear driving region, when calculating DT D and DT C Errors are more likely to occur during , and, if errors occur, DT D and DT C probably close to T 0

In particular, in the case of identifying a special type of optical disc such as a skewed disc, such errors may become larger depending on the position and tilt direction of the optical disc

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