Information recording medium and method of manufacturing resinous substrate for use in the recording medium
a technology of information recording medium and resinous substrate, which is applied in the manufacture of optical record carriers, record information storage, nuclear engineering, etc., can solve the problems of substrate warping, mechanical property deterioration, and difficulty in actual application practice, and achieve sufficient mechanical strength, sufficient tilt margin, and the effect of increasing the recording density
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example 1
[0066]FIG. 1 is a cross-sectional view schematically showing one example of an optical disk according to this example. In the optical disk shown in FIG. 1, one of the surfaces of a disk substrate 1 having a thickness of 1.2 mm is formed into a recording surface on which emboss pits 2 are formed in conformity with a recorded data. The thickness of the substrate 1 may be suitably selected as long as the thickness in the range of from 0.6 mm to 1.2 mm. The surface of this recording surface provided with the emboss pits 2 is covered with a reflective film 3 and then with an over-coating consisting of a protective film (first protective film) 4. In the case of the optical disk shown in FIG. 1, The surface of the protective film 4 is the light incident surface.
[0067]The readout of the recorded data stored in the disk can be performed as follows. Namely, as shown in FIG. 1, a light beam 5 is converged by an objective lens 6 and then enters through the protective film 4. The light beam is t...
example 2
[0087]FIG. 4 is a cross-sectional view schematically showing one example of an optical disk according to this example. In the optical disk shown in FIG. 4, one of the surfaces of a disk substrate 1 having a thickness of 1.2 mm is formed into a recording surface on which emboss pits 2 are formed in conformity with a recorded data. The surface of this recording surface provided with the emboss pits 2 is covered by a reflective film 3, and then cover-coated with a first protective film 4 and a second protective film 18 in the mentioned order. In the case of the optical disk shown in FIG. 4, the surface of the second protective film 18 is the light incident surface.
[0088]The readout of the recorded data stored in the disk can be performed as follows. Namely, as shown in FIG. 4, a light beam 5 is converged by an objective lens 6 and then enters through the second protective film 18. The light beam is then reflected by the reflective film 3, thus producing a light reflection accompanying ...
example 3
[0096]FIG. 5 is a cross-sectional view schematically showing one example of an optical disk according to this example. In the optical disk shown in FIG. 4, one of the surfaces of a disk substrate 25 having a thickness of 1.2 mn is provided with guiding grooves 26 to be used for the tracking of light beam 5. On this guiding grooves 26 are further formed a reflective film 27, a first protective film 28 constituting a lower protective film, a recording film 29, and a second protective film 30 constituting a upper protective film in the mentioned order. The surface of this second protective film 30 is further over-coated by a third protective film 31. In the case of the optical disk shown in FIG. 5, the surface of the third protective film 31 is the light incident surface.
[0097]The readout of the recorded data stored in the disk can be performed as follows. Namely, as shown in FIG. 5, a light beam 5 is converged by an objective lens 6 and then enters through the third protective film 31...
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Abstract
Description
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