JPS59227046A - Optical recording medium - Google Patents

Abstract

PURPOSE:To prevent generation of flaws and peeling-off, etc. on an organic resin layer by subjecting directly on other one surface which is in contact with the air of the organic resin layer, or desirably on other one surface of this organic resin layer to ion bombard processing, hardening the surface, and thereafter, providing a surface hardening film consisting of an inoganic substance film. CONSTITUTION:An organic resin layer 2 is formed by coating an organic resin by a dipping method on both faces of a write side glass substrate la, one surface of the organic resin layer 2 becomes the organic heat insulating layer 2, and a reflection preventive film 3, an optical recording layer 4 and a protective layer 5 are provided successively on the organic heat insulating layer 2. Also, said layer is stuck to an external glass substrate 1b through an adhesive layer 6, also ion bombardment processing is executed directly onto other one surface of the organic resin layer 2 which is opposed to the organic heat insulating layer and is in contact with air, or desirably on other surface concerned of the organic resin layer 2, the surface is hardened, and thereafter, a surface hardening film 7 constituted of an inorganic substance film whose refractive index is <=1.7, for instance, an SiO, Al2O3 or SiO2 film is provided, by which an optical recording medium is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an optical recording medium capable of recording and recording with a light beam.

Conventionally, optical recording media used in optical disks have been made of rare earth-transition metal alloy thin films, or cyclic oxide thin films such as chalcogen compounds that utilize the phase transition from amorphous to crystalline. , heat mode recording media, thermobranuchinoku recording media, etc. are known. For example, magneto-optical recording media formed of rare earth-transition metal alloy I films include polycrystalline thin films such as MnB1 and MnCuB1, Gd
Co, GdFe, TbFe, DyFe+c
dTbl"c, amorphous 1'j with TbDyFe
J film, single crystal l'y'X I model such as Gd IG, etc. are known.

Among these thin films, the film formation performance when manufacturing a large area thin film at a temperature near room temperature, and the R
I-The reading efficiency for reading, and the reading efficiency for reading the input signal with a good S/N ratio 1'
Taking into consideration the construction costs, it has recently been considered that the amorphous mononegative lji film is excellent as a photothermal recording medium. ca'r
bi;"e has a large Kerr rotation angle and has a single Curie point after 150°C nil, so it is suitable as a photothermal magnetic recording medium.") Furthermore, the inventors have determined that the Kerr rotation angle is 1t, and the angle is oriented -1-.
The unique and tilted viscosity that causes +,,I;,GdT
It has been found that bFeCo is a magneto-optical recording medium that has a sufficiently large Kerr rotation angle and can be read with a good S/N ratio.

However, for GdTbFeCo, one cucumber is 300
The problem is that recording cannot be performed unless the 11t beam is effectively contained in the magnetic layer. This problem is not limited to this magneto-optical recording medium.
This is a problem common to the optical recording media mentioned above.

In order to eliminate this problem, a structure has been proposed in which the front and back of the optical recording layer are sandwiched between heat insulating layers made of organic resin.

For example, as an example of the structure of an optical recording medium used for an optical disk, an external layer is formed by sequentially starting from the recording side substrate with a heat insulating layer, a reflective mountain protection layer as necessary, an optical recording layer, and an adhesive layer that also serves as a heat insulating layer. A medium configuration was adopted that was bonded to the substrate, and an organic resin was optimal for the heat insulating layer in contact with the submerged side substrate. However, in order to uniformly coat a large area glass substrate of approximately 300φ (, U) with good coverage and a thickness of approximately 1 μm or less, the dipping method must be used. Unfortunately, both sides of the board are coated with r+i. The E4K resin used as the heat insulating layer has poor surface strength, solvent resistance, and adhesion, resulting in problems such as poor appearance and deterioration of the S/N ratio in the 141-field.

However, in a conventional optical recording medium in which an organic heat insulating layer is formed by dipping, for example, as shown in FIG. is formed, provided with an anti-reflection layer 6, an optical recording layer 44, and a protective film 5, and bonded to the external glass substrate 1b via a contact layer 6. However, the self-insulating layer is When forming 21 (plate 1a
During use as an optical recording medium, the coating film on the air side becomes scratched, peeled off, etc. as shown in Figure 1, and the S/N ratio during readout deteriorates. Is it a drawback that it causes deterioration?

The present invention provides an optical recording medium in which an organic resin layer is coated on both sides of a cutting side glass board by dipping, and the organic resin layer is used as an organic heat insulating layer. ', 5' is prevented, and the appearance, t6, and solvent resistance are excellent, and the readability from the optical recording layer is improved.
An object of the present invention is to provide an optical recording medium with improved performance.

According to J-[A], an organic resin is coated on both sides of a writing side glass substrate by a dipping method to form a 11-layer resin layer, and one side of the 41-layer resin layer is coated with an organic resin. Optical recording 71141 provided with an organic recording layer, on the other surface of the organic resin layer that is in contact with air,
ll'l contact, preferably the other 11 of the organic resin layer, and ion bombardment j1]! After the true surface of J is exposed to heat, the surface is hardened with an inorganic substance.
This is achieved by the optical recording medium provided with a.

1ji1. Ps, it is preferable that the refractive JJi index of one model of the object's convexity is 1 cut, which is the same as that of the η mechanism fat layer, or -1. If the thickness is the same, the reflectance of each layer will not increase to 111 even if it is not precisely controlled. That is, in order to provide a surface-cured film on a synthetic resin layer without increasing the reflectance, the refractive index of the surface-cured resin must be the same as that of the organic resin used, or 1 mm higher. Bye. Preferred inorganic 'r'J'II'; 4 is refraction; t is 1.7, SiO, A403 or SiO2
It is a membrane.

'ljl The thickness of the substitute fit film is λ of the wavelength used.
Around /2 is preferable.

The method for forming the inorganic material film is preferably a vacuum evaporation method.

A preferred embodiment of the optical recording medium of the present invention is, for example, as shown in FIG.
Apply an organic resin on both sides of A by dipping to form a resin layer 2 with several resin layers. (The geometrical thermal insulation layer 2 is provided with an anti-reflective layer 4, a protective layer 5, and a protective layer 5.)
At the same time as bonding to the external glass substrate 1b via k't 6, the thermal layer 2 is directly, preferably, on the other side -1- of the organic resin layer 2 which is in contact with the thermal surface 2 and the air. After ion bombarding the other surface of the organic resin layer 2 to harden the surface, an inorganic material film having a refractive index of 1.7, such as SiO, A
41.1. from IJ20s or 5in2 membrane. By providing the hard film 7 on the entrance surface (11).

A) After ion bombarding the other side of the machine JKiJ resin layer 2 to clean and harden the surface, the adhesion and surface strength are further improved by forming a surface hardening II. ”

Optical description of the present invention j; Depending on the A medium, the organic resin The layer scratches and peeling Z:, Ij are: Xh, tlr, and have excellent appearance and solvent resistance. The effectiveness of reading from the recording layer is determined by increasing the readout efficiency.

Hereinafter, the present invention will be further explained with reference to Examples.

Example 1 In FIG. 2, a polyacrylate resin with a refractive index of about 1.62 was used as the organic resin (the wavelength used was about 800 nm).
), depending on the person, ++xs thickness 0.2~0.
3 thm on the writing/\inside glass substrate 1a,
S with a refractive index of about 1.65 is placed on the air side of the organic resin layer 2.
The iO film 7 is formed using the vacuum evaporation rI method so that the wavelength used for one layer is approximately 80.
The film was formed to have a thickness of about 0 nm/2 times. Anti-reflection 1 ゛CZrO2 film, 'I'a205 film,
Either Nb2O or Gd is used as the recording magnetic layer.
Using TbFeCo quaternary amorphous film, 510II!>4 + A40311K as a protective layer.
+ S+0211 &, j r All lI smell + T
The optical recording medium of the present invention is produced by using either a Cr film or a Cr film, and a urethane adhesive for a second layer. The refractive index of the resin and the SiO film was approximately between 11:1 and the reflectance was not particularly increased even if the thickness of each film was 11:1. %, 200 II
As a result of the moisture resistance test, the film peeling and film cracking of the air-side organic resin layer was reduced to 11-1, and the surface strength was improved from less than 2B to 3I (lead fI' hardness (45° inclination, load IKg)). , the readout efficiency was also improved.

Example 2 The same procedure as Example 1 was carried out except that A'20311 having a refractive index of about 1.60 was used instead of the SiO film, and the surface hardening effect was the same.

Example 3 A film was prepared in the same manner as in Example 1 except that a film mainly composed of 5i02 with a refractive index of about 1.48 was used instead of the SiO film.
1, the surface hardening effect of the city.

Example 4 Same as Example 1 except that the surface of the resin layer on the right side of the Z'g air side was cleaned using ion bombardment (7) of the ion bombardment before forming the Iψ film. Similarly, records of the present invention I', 1. 'The body? 1 again. The density of the curing force was improved, and the surface hardening effect was further improved compared to the case where the yarn was not subjected to the ion bombardment treatment.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram for explaining the structure of a conventional optical recording medium. FIG. 2 shows ['f?'] of the optical recording medium of the present invention. FIG. 2 is a schematic diagram for explaining an i-structure. 1a, 1b・Glass substrate 2・・Provided PJ、Insulating layer or ladle resin layer 6・
--- Reflective rainproof layer 4 --- Optical recording layer 5 --- Protective layer 6 --- Contact layer 7 --- Surface hardening 4 film

Claims (3)

[Claims] (1) ,! J Injection side glass plate 1 (4 pieces of resin 117i were applied by dipping the original resin onto the screen of the plate)
In an optical recording medium, the optical recording medium is provided with a heat-insulating layer on one side of the mechanical resin layer, and an optical recording layer is provided on the rj', BU l:tli thermal layer. There is no geometrical Ti on the other 1" side of the resin layer that is in contact with the air.
1J) Medium with a hardened surface 1194 consisting of a film. (2) Applicable? 1 machine, one side of the curve of the fat layer is subjected to ion bombardment treatment to harden the surface, and then a surface hardening film is formed on the hardened surface 41. : , +”, ] The optical recording medium according to claim 1. (3) The surface hardened film has a refractive index of 1.7 or less at 810°A.
Is g2O or SiO2 true? 1s;J'j, 4'1
Sen J5 characterized by being established by law
'1. The optical recording medium according to claim 1 or 2.