Optical recording medium

Abstract

[Problem] To provide an optical recording medium having a recording layer that absorbs light with a wavelength of 350 nm to 500 nm, the optical recoding medium having good recording playback properties even when the ambient temperature changes, and allowing playback distortion to be controlled even when stored in a high temperature environment. [Solution] A write-once type optical recording medium including: a substrate (10); a reflective layer (11) that reflects light with a wavelength of 350 nm to 500 nm on the substrate; a recording layer (12) that absorbs light with a wavelength of 350 nm to 500 nm; and a light transmission layer (14) with a single-layer construction that transmits light with a wavelength of 350 nm to 500 nm, the light transmission layer (14) having a modulus of elasticity at 75°C that ranges from 50 MPa to less than 170 MPa.

Description

technical field [0001] The present invention relates to a substrate, a reflective layer laminated on the substrate that reflects at least light with a wavelength of 350nm to 500nm, a recording layer made of organic pigments that absorbs light with a wavelength of 350nm to 500nm, and a light that transmits light with a wavelength of 350nm to 500nm. A write-once optical recording medium with a transparent layer. Background technique [0002] In recent years, in order to increase the data recording capacity, an optical recording medium that uses an objective lens with a numerical aperture of 0.85 to focus a laser beam with a wavelength of 405 nm on the recording layer to record data, the so-called Blu-ray Disc, has been developed and put into practical use. [0003] This optical recording medium has a laminated structure of at least a recording layer and a light-transmitting layer about 100 μm thick that transmits a laser beam on a support substrate with a thickness of 1.1 mm. ...

AI Technical Summary

Problems solved by technology

[0004] In this way, the thickness of the support substrate and the light transmission layer are different, and they are usually made of materials with different physical properties such as elastic modulus. Due to changes in ambient temperature, etc., the optical recording medium is prone to bending problems.

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