Optical information recording medium and manufacturing method thereof
A technology for recording media and optical information, applied in the manufacture of optical record carriers, optical record carriers, audio record carriers, etc., can solve problems such as quality degradation, rough workmanship, and light transmittance decline
Inactive Publication Date: 2008-09-10
TAIYO YUDEN KK
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- Description
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Problems solved by technology
Therefore, there is a problem that the appearance of the optical information recording medium gives consumers the impression that the workmanship is rough, resulting in a decrease in the value of the product.
Therefore, there is a possibility that moisture in the air enters the underlayer coating film 109, resulting in a decrease in quality, such as a decrease in light transmittance.
Method used
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Embodiment 1
[0079] First, a disc-shaped substrate 11 made of polycarbonate resin having a thickness of 1.1 mm, an outer shape of 120 mm, and an inner diameter of the center hole 12 of 15 mm was formed by injection molding. (Illustration omitted) The substrate 11 has a spiral groove 11 b having a track pitch of 0.32 μm on one of the main surfaces 11 a side. In addition, concentric first grooves 11c1 and second grooves 11c2 with a pitch of 0.4mm, a groove width of 0.2mm, and a groove depth of 0.1mm are provided at a distance of 22mm to 44mm from the center of the substrate. Furthermore, a preliminary groove 11c0 is provided between the first groove 11c1 and the spiral groove 11b.
[0080] Next, as shown in FIG. 2(A), on the side of one main surface 11a where the spiral groove 11b is formed on the substrate 11, a 100nm-thick film is formed by sputtering so as to cover the spiral groove 11b. Light reflection layer 13 made of Ag alloy.
[0081] Next, an organic dye coating solution 15a is pr...
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Abstract
An optical information recording medium of which the commercial value is not reduced is provided, in which a light reflection layer, an optical recording layer, a first light transmission layer, and a second light transmission layer are provided in this order on one main surface of a disk-shaped substrate, and a method of manufacturing the optical information recording medium is provided. A light reflection layer, an optical recording layer, a protection layer, a first light transmission layer, and a second light transmission layer may be provided in this order on the one main surface of the disk-shaped substrate. The substrate has a first groove and a second groove approximately concentrically formed nearer an inner circumference of the substrate than an area in which the optical recording layer is to be provided. The first light transmission layer is provided such that an edge thereof is situated near an edge of an outer circumferential side of the first groove. The second light transmission layer is provided such that an edge thereof is situated near an edge of an outer circumferential side of the second groove. Therefore, each of the first and second light transmission layers does not meander at an inner circumferential edge thereof in a circumferential direction, leading to excellent quality in appearance.
Description
technical field [0001] The present invention relates to a disc-shaped optical information recording medium and a manufacturing method thereof. More specifically, the present invention relates to a disc-shaped substrate having a light reflective layer, an optical recording layer and a light-transmitting layer in sequence on one main surface. Layered optical information recording medium and its manufacturing method. Background technique [0002] A conventional disc-shaped optical information recording medium such as a write-once CD (so-called CD-R (Compact Disc-Recordable, recordable disc)) has the following structure: one of the translucent substrates provided with a pre-groove or the like A recording layer and a reflective layer are formed on the surface. Then, by irradiating laser light with a wavelength of generally around 780 nm from the other surface side of the substrate, data is recorded on and / or reproduced from the recording layer. [0003] In addition, a disc-shap...
Claims
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IPC IPC(8): G11B7/24G11B7/26G11B7/24047G11B7/24056G11B7/24067
CPCY10T428/2457G11B7/24056B29L2017/005G11B7/266
Inventor 萩原康仁萩原基光大津毅宫田章正相原邦行
Owner TAIYO YUDEN KK