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Testing disc

A technology for testing discs and signals, applied in instruments, optical record carriers, optical recording/reproducing/erasing methods, etc., can solve the problems of difficulty in adjusting the pickup for compatibility and playback, strict specifications, etc., to save time and operation, fast effect of adjustment

Inactive Publication Date: 2004-10-20
上海联合光盘有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, due to the difference in recording density, the physical structure of the disc pit (recording mark) size, pitch, thickness of the substrate, and the modulation method of the recording signal are also different. Therefore, it is quite difficult to adjust the pickup to be compatible with playback.
The reason is that, due to the increase in recording density, the specifications of the disc, etc. have become more stringent, and thus the accuracy required for the adjustment of the pickup has also increased.

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0053] A test disc 10 according to Embodiment 1 of the present invention shown in FIG. 1 is played back using a pickup 12 . In FIG. 1 , the right side is the inner peripheral side of the test disk 10 , and the left side is the outer peripheral side.

[0054] The test disc 10 includes three recording layers 14, 20 and 26 stacked. The first recording layer 14 includes a first substrate 16 and a protective layer 18 laminated thereon, the second recording layer 20 includes a second substrate 22 and an adhesive layer 24 laminated thereon, and the third recording layer 26 includes a third substrate 28 and an adhesive layer 30 laminated thereon.

[0055] The material of each substrate must be transparent. Also, glass is ideal because it does not warp, but transparent resins such as PC (polycarbonate) or PMMA (polymethyl methacrylate) may also be used. The material of the adhesive layers 24, 30 and the protective layer 18 is preferably a short curing time and transparent ultraviole...

Embodiment 2

[0078] The test disc 50 according to the second embodiment of the present invention shown in FIG. 12 is played by the pickup 12 . In FIG. 12 , the right side is the inner peripheral side of the test disc 50 , and the left side is the outer peripheral side.

[0079] The test disc 50 includes three recording layers 14, 20 and 26 stacked. Its structure, material, manufacturing method and playing method of the pickup 12 are the same as those in Embodiment 1, so no further description is given here.

[0080] However, the formation region of the reflective film 44 is different from that of the first embodiment. An aluminum reflective film 44 is formed on the entire first signal recording surface 34 of the first substrate 16 by sputtering. On the second signal recording surface 38 , a reflective film 44 is formed on the inner peripheral side of the first signal recording surface 34 other than the read region w1 . On the third signal recording surface 42 , a reflective film 44 is f...

Embodiment 3

[0083] A test disc 52 according to Embodiment 3 of the present invention shown in FIG. 13 is played using the pickup 12 . In FIG. 13 , the right side is the inner peripheral side of the test disc 52 , and the left side is the outer peripheral side.

[0084] The test disc 52 includes two recording layers 14 and 54 laminated. The materials of the first recording layer 14 and the test disc 52 are the same as those of the first embodiment, and therefore, no further description is given here.

[0085] The 2nd recording layer 54 comprises the 2nd substrate 56 and the adhesive layer 58 laminated therewith, the 2nd substrate 56 has the 2a signal recording surface 62 and the 2b signal recording surface 66, and the 2a signal recording surface 62 records can use the 2a The 2a signal played by the wavelength laser 60 is recorded on the 2b signal recording surface 66 and the 2b signal which can be played by the 2b wavelength laser 64 is recorded. A part or the whole of each signal record...

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PUM

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Abstract

In the test disk for adjusting the pickup for compatible reproduction wherein a plurality of recording layers having recording densities different from each other are laminated, each recording layer has a signal recording surface recorded in a fixed form. Disk exchanging operation and adjusting operation therefor can be omitted when the pickup for compatible reproduction is adjusted by laminating a plurality of the recording layers having recording densities different from each other in one disk and adjustment of the pickup can be highly accurately performed since there is no difference in the disk itself and a chucking state by disk exchange.

Description

technical field [0001] The present invention relates to a test disc, in particular to a test disc with a plurality of recording layers with different recording densities stacked, each recording layer having a signal recording surface for recording signals in a certain form, and a test disc for adjusting a compatible playback pickup . Background technique [0002] Patent Document 1 discloses an example of a conventional test disk. This prior art is an optical disc for adjusting a pickup for a playback device compatible with optical discs such as CDs and DVDs having different substrate thicknesses. The optical disc is made by bonding ultraviolet curable resin, and each signal recording surface is formed at different positions in the radial direction in different formats, so that multiple optical discs can be played back with laser beams from the same direction. [0003] According to this prior art, when checking whether the compatible playback pickup can correctly play each ...

Claims

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Application Information

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IPC IPC(8): G11B7/00G11B7/004G11B7/007
CPCG11B7/24041G11B7/24097
Inventor 前纳良昭小川光昭
Owner 上海联合光盘有限公司