JPS61153848A - Optical disk - Google Patents

Abstract

PURPOSE:To eliminate an error in information recording and reproduction even in long-period storage by forming an optical disk which have a hollow part between plural circular substrates arranged across spacers with recording layers inside and providing a projection to the optical disk at the side of the spacer. CONSTITUTION:The projection part 41 is provided at the side of the hollow part 3 of the internal end part spacer 40. The internal end part spacer 40 uses a material which has larger diffusivity than the substrates 1, and then when an optical disk is cooled abruptly, dew is condensed on the spacer 40 to prevent dew from being condensed on recording layers 2, errors in the recording and reproduction of information are eliminated. For the purpose, the projection part 41 is provided to increase its surface area, so that no dew is condensed on the recording layers 2 even in case of large temperature variation.

Description

Detailed Description of the Invention (Field of Industrial Application) Regarding the structure of an optical disk used in the FJAFi original disk storage device of the present invention (Prior art and its problems) It records, records, and reproduces information by irradiating it. The original disk used for this (there is something called an air sandwich type optical disk, this is a disk with a hollow part inside, and it is usually a record that can record information with a laser beam on at least one inner surface) Two circular substrates provided with layers are bonded together with spacers sandwiched between the outer and inner ends, and the hollow portion thus formed is sealed.

Conventionally, when such optical discs are used for a long time, errors occur in recording and reproducing information, which has been a problem.

FIG. 2 is a diagram showing a cross-sectional shape of a conventional original disk. The recording layer 2 is provided on one side of the acrylic resin substrate 1, and the substrate 1 is bonded to the recording layer 2vi through a spacer 4.5 so as to form a hollow portion 3 on the inside. is sealed from the outside air. When we investigated the cause of recording/reproduction errors occurring when such optical discs were used for long periods of time, we found that this was due to dew forming on the recording layer due to rapid external temperature changes.
This is because if a disk in a warm environment is suddenly brought into a gold-plated environment, dew will form on the recording layer, and this dew will react with the recording layer, degrading the recording and reproducing characteristics.

(Object of the Invention) The object of the present invention is to provide all optical disks that can be stored for a long time without errors in recording or reproducing information. (Structure of the Invention) The optical disk of the present invention An air sandwich type original disk having a structure in which a plurality of circular substrates each having at least one circular substrate having a recording sound recorded thereon are formed with a hollow portion between the substrates as the entire inside of the recording layer via a spacer. The spacer is characterized in that all of the protrusions serve on the hollow side of the spacer. - (Detailed explanation of configuration) The present invention solves one problem in the prior art by adopting the above-mentioned configuration. The present invention will be explained below with reference to the drawings.

FIG. 1 is a diagram showing the cross-sectional shape of the optical disc of the present invention. A protrusion 41 is provided on the hollow portion 3 side of the inner end spacer 40 . The material of the inner end spacer 40 is the substrate l.
By using a material with a thermal diffusivity higher than
When using this principle of sound that does not cause playback errors, it was not possible to cope with large temperature changes simply by forming the conventional inner end spacer with a material with a high thermal diffusivity as shown in Fig. 2, but with the present invention. By providing the protrusions 41 to increase the surface area, it becomes possible to avoid atomization on the recording layer 2 even when there is a large temperature change. (Example) Examples of the present invention will be described below. , inner diameter 15mm
, a 145 mm acrylic resin disk substrate with a guide groove of 120 mm outer diameter and 1.2 mm thickness.
An organic thin film having a thickness of 800 Å and containing 0.0 cm or more was formed as a recording layer. Record two of these single discs/1m? An air sandwich optical disk was fabricated by bonding an aluminum alloy spacer on the inside with an ultraviolet curing resin. At this time, the outer end spacer is l] 20mmXj1111
A simple ring with a thickness of 6 mm and a plate thickness of 0.5 mm was used, but the inner end spacer was made of Fil 33 mm x Jl 116 mm, and a protrusion extending 6 rm toward the hollow side of the ring with a plate thickness of 0.5 mm (the plate thickness of the protrusion was 0.5 mm) was used. 2 mm) was used.

The original disk produced in this way was heated at 40°C to 15°C.
Even if the product is stored for a long time in an environment where the temperature changes rapidly,
The entertainment of recording Φ playback did not increase.

On the other hand, the effectiveness of the present invention was confirmed by the increase in recording/reproducing errors in the same environment for disks with a spacer without protrusions.The same effect was obtained even when protrusions were attached to the outer end spacer. there were.

(Effects of the Invention) As is clear from the above embodiments, the present invention makes it possible to obtain an optical disc that can be recorded and played back without any problem even when stored for a long time.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the original disk according to an embodiment of the present invention, and FIG.
The figure is a sectional view of a conventional air sandwich restoration disk. In the figure, 1 is a substrate, 2 is a recording layer, 3 is a hollow part, 4 is an inner end spacer, 5 is an outer end spacer, 40 is a spacer with a protrusion, and 411ri is a protrusion.

Claims (2)

[Claims] (1) At least one circular substrate with a recording layer on its surface
The disc is an air sandwich type optical disc having a structure in which a hollow part is formed between the plurality of circular substrates with spacers interposed therebetween and the recording layer is inside, and a protrusion is provided on the hollow part side of the spacer. An optical disc characterized by: (2) The optical disk according to claim 1, wherein the spacer is made of a material having a higher thermal diffusivity than the substrate.