Optical medium identification method

A medium and optical technology, which is applied in the recording of information on the disk, instruments, magnetic recording, etc., can solve the problems that the boundary distance between the data layer and the transparent layer cannot be judged, and the transparent layer is difficult to distinguish.

Inactive Publication Date: 2004-07-07
LITE ON IT
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Problems solved by technology

However, because the boundary of the transparent layer will only cause a small amount of reflection to the light spot, it is difficult to judge the position of the transparent layer, and it is also impossible to judge the distance between the data layer and the boundary of the transparent layer, thus causing misjudgment

Method used

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Embodiment Construction

[0034] specific implementation

[0035] The present invention provides a method for judging optical media, which can effectively distinguish between DVD discs and CD discs, see figure 1 , 5 ,and Figure 6 , the flow process of the present invention is as follows:

[0036] Step 100 moves the focusing device of the optical head to a mechanical lower limit H;

[0037] Step 102 lighting a laser;

[0038] Step 104 moves the focusing device of the optical head to a mechanical upper limit U, and continuously records the reflection amount of the laser beam during the movement, and records the first peak occurrence time t1 or t3 exceeding a reflection threshold value (see the dotted line);

[0039] Step 106: move the focusing device of the optical head to a mechanical lower limit H, and continuously record the reflection amount of the laser beam during the movement, and record the second peak occurrence time t2 or t4 exceeding a reflection threshold value;

[0040] Step 108 calcul...

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Abstract

The present invention relates to an optical medium judging method for distinguishing DVD from CD effectively being advantageous to read optical disk. In this method, the optical reading head moves forward and backward between two limit positions so as to pass through the data layer of the disk twice for the focused laser beam, then the time difference or the distance difference between two reflecting peaks which exceeds a threshold of reflecting amount is measured, and the measuring result can be used to judge the sort of optical disk. In this method it is unnecessary to detect the reflecting peak of the transparent layer of the disk, judging errors can be reduced and disk reading efficiency can be improved effectively.

Description

technical field [0001] The invention relates to a method for judging an optical medium, in particular to a method for effectively distinguishing DVD disks and CD disks to facilitate reading by optical drives. Background technique [0002] Optical information storage media has been attracting the attention of the industry and consumers because of its advantages of large capacity and non-contact reading. From the earliest appearance of laser disc (LD), music disc (CD), data disc (CD-ROM) and rewritable disc (CD-RW), due to the limitations of physical structure, specifications and technology, so There is no great breakthrough in capacity. Until the advent of the digital laser video disc (DVD), due to the smaller track pitch, the minimum pit length and the use of a shorter wavelength light source, the capacity is more than seven times higher than that of known data discs. [0003] The specifications established so far for digital video discs (DVDs) can be broadly classified as...

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Application Information

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IPC IPC(8): G11B19/12
Inventor 徐正煜符湘益李敦介陈福祥蔡燿州
Owner LITE ON IT
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