Optical disk and method and apparatus for manufacturing the same
A technology of optical discs and equipment, applied in the field of double-layer optical disc ROM, can solve the problems of deteriorating the quality of reproduced signals, etc.
Inactive Publication Date: 2005-02-02
KK TOSHIBA
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Problems solved by technology
Thus, unless it is further thinned, especially in which a layer L1 (i.e., a reflective film on the deeper side) is formed that is pits concave as viewed side-on, pits with minimum width can be partially filled by the membrane, deteriorating the quality of the reproduced signal
[0007] As mentioned above, in the use of reflective films - each layer of reflective film is stacked with a dielectric layer on the metal layer to obtain a dual-layer disc, where the total amount of light reflected by each layer of reflective film for the blue laser beam is equal to Equal - in the case of each layer of reflective film is about 60 to 80nm thick, as a result, the small pit in layer 1 (deeper side) - seen as concave when the side is up - is filled by part of the film, thus deteriorating the quality of the reproduced signal
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[0018] A certain embodiment of the present invention will be described with reference to the accompanying drawings.
[0019] Typically, dual-layer discs have features such as figure 1 The structure shown includes a translucent film 12 (layer 0) and a fully reflective film 14 (layer 1). The semitransparent film 12 is a layer formed on the light incident side (on which the light is incident), and the total reflection film 14 is formed deeper than the semitransparent layer 12 . Signal images (information) are transferred as pits onto two forming substrates 11 and 15 formed of a light-transmitting resin such as polycarbonate. The two-layer forming substrates 11 and 15 are bonded together with an intermediate layer 13 formed of, for example, an ultraviolet curable resin interposed therebetween. Generally, different information is recorded on the substrates 11 and 15, respectively. Thus, needless to say, the bit arrangement on the substrate 11 is different from the bit arrangemen...
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Abstract
The optical disk is provided with a first substrate 15 having pits showing information formed on one surface thereof and a reflection film 14 on the pit side surface and a second light transmissive substrate 11 having pits showing information formed on one surface thereof and a semitransmissive film 12 consisting of silver or a silver alloy consisting essentially of silver on the pit side surface. The reflection film 14 and the semitransmissive film 12 are provided opposite to each other and the part between the reflection film and the semitransmissive film is filled up with an intermediate layer.
Description
technical field [0001] The present invention relates to a dual layer optical disc ROM which includes two information recording layers and which can read information from one side of the disc by using a laser beam. Background technique [0002] As a method of increasing the capacity of an optical disc, a method of using a double layer is given. In particular, as a disc ROM, such as a DVD-ROM, a single-sided dual-layer disc has been widely manufactured and used because such a disc ROM has a simple structure and a simple manufacturing method. [0003] Single-sided dual-layer discs require two layers of reflective film, and the layer close to the optical pickup used to reproduce information needs to be formed with a semi-transparent film. However, in the conventional double-layer disk, since the translucent film is formed of materials including gold (Au) and silicon (Si), it also has a problem. This is because, although conventional translucent films can be used as translucent...
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IPC IPC(8): G11B7/24G11B7/257G11B7/258G11B7/26
CPCG11B2007/25706G11B7/2578G11B7/2531G11B7/256G11B7/2534G11B7/26G11B7/2585G11B7/24038
Inventor 大寺泰章
Owner KK TOSHIBA