JPH02156437A - Optical disk - Google Patents

Abstract

PURPOSE:To obtain a thin disk by adhering disk substrates with recording films facing to each other to a supporting body which absorbs laser light. CONSTITUTION:The disk substrates 1 are adhered to the supporting body 2 which absorbs laser light to be used in a manner that the recording films face to each other. When laser light irradiates the disk, the light is absorbed by the supporting body 2 and never returns to the incident side nor transmits to reach the recording layer of the opposite side. The air gaps 3 can be enough minimized, and thus the obtd. optical disk is thin.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to optical discs.

[Conventional technology]

Conventional optical discs are composed of a disc substrate and a support, and a transparent support is used as the support.

That is, the support used in conventional optical discs is a transparent resin substrate, which reflects the laser used for recording and reproducing the optical disc.

[Problem to be solved by the invention]

However, in such conventional optical discs, the support reflects the laser used for recording and reproducing, so if the support and the recording film are too close, the recording and reproducing characteristics deteriorate.
This has the disadvantage that a sufficiently large space must be taken up and the overall thickness of the optical disk becomes thick.

[Means to solve the problem]

The optical disc of the present invention is constructed using a material having the property of absorbing laser as a support.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a sectional view showing an embodiment of the present invention.

The optical disk shown in FIG. 1 is bonded to a disk substrate 1 with an air gap 3 in such a manner that the recording film faces each other with a support 2 in between. This support 2 has the property of absorbing the laser beam 4 irradiated onto the optical disc.

In other words, since the support 2 absorbs the laser beam irradiated onto the optical disc 1, the laser beam does not return to the incident side and does not reach the recording film on the opposite side. There is no effect of this, and the signal quality does not deteriorate.

Furthermore, the air gear 3 can be made narrower than the conventional one, and the overall thickness of the optical disk can be made thinner.

〔Effect of the invention〕

By using the optical disc of the present invention as a support having laser absorption characteristics, reflection from the support can be eliminated, and the support and the disc substrate can be brought close to each other, so that the overall thickness can be reduced. It has the effect of making it thinner.

Argap,

Claims (1)

[Claims] 1. An optical disc comprising: a disc substrate having a recording film; and a support that absorbs laser used for recording and reproduction, to which the disc substrate is adhered with the recording film surfaces facing each other.