JPH0823940B2 - Optical information recording medium - Google Patents

Description

TECHNICAL FIELD The present invention relates to an optical information recording medium that irradiates a laser beam and reproduces recorded data by the reflected light.

[Prior Art] An optical information recording medium capable of recording data by irradiating a laser beam has a recording layer including a metal layer such as Te, Bi and Mn and a dye layer such as cyanine, merocyanine and phthalocyanine. The pits are formed and the data is recorded by means of deforming, sublimating, evaporating or modifying the recording layer by irradiating the laser beam. In an optical information recording medium having such a recording layer, a void is generally provided behind the recording layer in order to facilitate deformation, sublimation, evaporation or modification of the recording layer when forming pits. ing. Specifically, for example, two substrates are stacked with a space in between,
A laminated structure called a so-called air sandwich structure is adopted.

In this optical information recording medium, the translucent substrate 1 is used.
Laser light is irradiated from the side to form pits. And
When the recorded data is reproduced, a laser beam whose power is weaker than that at the time of recording is emitted from the side of the substrate 1, and a signal is read due to the difference in reflected light between the pit and other portions.

On the other hand, a so-called ROM type optical information recording medium in which data is recorded in advance and the data cannot be written or erased thereafter has already been widely put to practical use in the information processing and audio departments. This kind of optical information recording medium does not have a recording layer as described above, and pits for reproducing recorded data are formed beforehand on a polycarbonate substrate by means of a press or the like, and Au, Ag A reflective layer made of a metal film such as Cu, Al or the like is formed and further covered with a protective layer.

The most typical of these ROM type optical information recording media is a compact disc, a so-called CD, which has been widely put into practical use in the audio sector and the information processing sector. The specifications of the recording and reproducing signals of this CD are the so-called CD format. A playback device that has been standardized as, and is compliant with this, is extremely widespread as a compact disc player (CD player).

[Problems to be Solved by the Invention] Since the above optical information recording medium is a recording / reproducing means that uses the same laser light as that of a CD, it can be reproduced by a CD player whose reproducing device is already widespread, that is, a CD format. It is strongly desired to comply with.

However, the above-mentioned optical information recording medium has a recording layer not found in CD, and means for forming pits on this recording layer, not on the substrate, is used for recording. Further, since the recording layer has voids or the like for facilitating the formation of pits, the reproduced signal naturally differs from that of the CD. For this reason, it is difficult to satisfy the above-mentioned CD format that defines the standard for so-called CD. In particular, under the present circumstances, a reproduction signal conforming to the CD format cannot be obtained due to the low degree of modulation of the reproduction signal.

The present invention has been made to solve the above-mentioned conventional problems, and an object thereof is to provide a writable optical information recording medium capable of obtaining a reproduction signal having a high degree of modulation conforming to the CD format. .

[Means for Solving the Problem] That is, in order to achieve the above-mentioned object, the gist of the first means adopted in the present invention is to absorb laser light through another layer on the transparent substrate 1. In an optical information recording medium having a light absorbing layer 2 and a light reflecting layer 3 provided on the light absorbing layer 2 directly or via another layer, which reflects the laser light, A material containing heat and pressure increase by irradiation is contained, and an intermediate layer 6 is interposed between the light absorption layer 2 and the transparent substrate 1. The intermediate layer 6 has a Rockwell hardness of ASTM D785 of M100. The optical information recording medium is characterized in that

The gist of the second means is, in the optical information recording medium,
The heat distortion temperature of the mid layer 6 is 50 to 150 at ASTM D648 4.6 Kg / cm ² .
The optical information recording medium has a temperature of ° C.

[Operation] In the above optical information recording medium, when the light absorption layer 2 is irradiated with laser light, the light absorption layer 2 absorbs the laser light and generates heat, and is melted, evaporated, sublimated, reacted, decomposed or modified. As a result, local energy conversion is performed as heat and pressure increase. At this time, the heat distortion temperature of the intermediate layer 6 interposed between the transparent substrate 1 and the light absorbing layer 2 is ASTM D648. 4.6Kg /
The energy generated in the light absorbing layer 2 is locally deformed on the surface of the intermediate layer 6 because the Rockwell hardness is in the range of 50 to 150 ° C. in cm ² or the Rockwell hardness is in the range of M100 to 50 in ASTM D785. Absorbed by Therefore, the pits 5 are formed in the same layer 6 by the above deformation.

Thus, the pits 5 formed in the intermediate layer 6 are similar to the pits previously formed in the surface layer of the translucent substrate by means such as pressing. Further, another layer, for example, the light reflection layer 3 made of a metal layer can be provided in close contact with the back of the light absorption layer 2. Therefore, an optical information recording medium similar in form to a CD can be obtained, and a recordable optical information recording medium conforming to the CD format can be easily obtained.

Here, the reason why the heat distortion temperature or hardness of the mid layer 6 is limited to the above range is as follows. That is, when the thermal deformation temperature of the intermediate layer is less than the above range, the pits 5 once formed are easily deformed by the heat received thereafter, and the stability of the recorded data is poor. Further, when the thermal deformation temperature of the intermediate layer 6 exceeds the above range, it is difficult to absorb the energy generated in the light absorption layer 2 in the form of the deformation of the intermediate layer 6, so that the clear pit 5 cannot be formed and the modulation occurs. A reproduced signal with a high frequency cannot be obtained. The same applies to the hardness. When the hardness of the intermediate layer 6 is less than the above range, the pits 5 once formed are easily deformed by a small external force, and the stability of the recorded data is poor. Further, when the hardness of the intermediate layer 6 exceeds the above range, the energy generated in the light absorption layer 2 is difficult to be absorbed in the form of deformation of the intermediate layer 6, so that clear pits 5 cannot be formed and the modulation degree is reduced. No large playback signal can be obtained.

[Embodiment] Next, an embodiment of the present invention will be described in detail with reference to the drawings.

An example of a schematic structure of the optical information recording medium according to the present invention,
It is shown in FIGS. In the figure, 1 is a translucent substrate, 6 is an intermediate layer made of a resin or the like formed thereon, 2 is a light absorbing layer further formed thereon,
It is a layer having a function of absorbing the irradiated laser beam to generate heat, melt, evaporate, sublimate, deform or modify, locally deform the intermediate layer 6 to form an optically modified pit.

As described above, in the present invention, the heat distortion temperature of the intermediate layer 6 is in the range of 50 to 150 ° C. at ASTM D648 4.6 Kg / cm ² , or the Rockwell hardness is in the range of M100 to 50 at ASTM D785. is necessary. On the other hand, behind the light absorption layer 2, for example,
The protective layer 4 preferably has a higher heat distortion temperature and a higher hardness than the intermediate layer 6. Reference numeral 3 denotes a light reflection layer which is formed on the light absorption layer 2 and reflects the laser light, and 4 denotes a protective layer which is provided outside thereof.

2 and 4 show a state before recording with laser light, and FIGS. 3 and 5 show a state after recording, that is, a local state of the light absorption layer 2 at the time of laser light irradiation. Due to thermal deformation,
The state in which the intermediate layer 6 is partially deformed and the pits 5 are formed is schematically shown. FIG. 3 shows that the heat absorption of the light absorption layer 2 due to the irradiation of the laser light and the deformation due to the increase in pressure are substantially caused by the intermediate layer 6.
1 and the transparent substrate 1 is barely reached. On the other hand, in FIG.
Not only that, the case where the pits 5 are formed over the transparent substrate 1 and from the intermediate layer 6 to the transparent substrate 1 is shown. Generally, when the thickness of the intermediate layer is as thin as 30 nm or less, and the heat distortion temperature of the transparent substrate 1 is AS.
TM D648 4.6 Kg / cm ² 85 ~ 200 ℃, Rockwell hardness
If it is about M200 to 75 according to ASTM D785, the pit 5 like the latter is formed.

In the present invention, the pit 5 of any of the forms shown in FIGS.
It does not matter even if the formation is made.

A specific example of this optical information recording medium will be described below.

(Example 1) As a light-transmissive substrate 1, a thickness having a spiral pre-groove 8 having a width of 0.8 µm, a depth of 0.08 µm, and a pitch of 1.6 µm in a diameter range of 46 to 117 mmφ formed by an injection molding method. A polycarbonate disc having a diameter of 1.2 mm, an outer diameter of 120 mmφ and an inner diameter of 15 mmφ (manufactured by Teijin Chemicals Ltd., trade name: Panlite) was used. The polycarbonate substrate 1 has a Rockwell hardness ASTM of D785 of M75 and a heat distortion temperature ASTM of D64.
8, 4.6kg / cm ² and 130 ℃.

An acrylic resin (SN-EX7042 made by San Nopco) is spin-coated on the transparent substrate 1 as the intermediate layer 6 to a thickness of 70 nm, and an organic dye for forming the light absorbing layer 2 on the spin coating. As 0.65 g of 1,1 ′ dipropyl 3,3,3 ′,
3'Tetramethyl 5,5 'dimethoxyindodicarbocyanine iodide was dissolved in 10 cc of diacetone alcohol solvent, and this was coated on the surface of the substrate 1 by spin coating to form a light absorption layer having a thickness of 90 nm. Formed 2. The heat distortion temperature ASTM of the intermediate layer 6 is D648, 4.6 kg / cm ² , 100 ° C,
Rockwell hardness ASTM is D85 and M85.

Next, a silicon acrylic resin is formed on the light absorption layer 2 by spin coating with a thickness of 50 nm, and then the diameter of the disc is increased.
By the sputtering method over the entire area of 45 ~ 118 nmφ,
An Au film having a film thickness of 50 nm was formed to form the light reflecting layer 3. Further, an ultraviolet curable resin is spin-coated on the light reflecting layer 3 and is irradiated with ultraviolet rays to cure the resin so that the film thickness is 10 μm.
Was formed on the protective layer 4.

The optical disk thus obtained was irradiated with a semiconductor laser having a wavelength of 780 nm at a linear velocity of 1.2 m / sec and a recording power of 6.0 mW to record an EFM signal. Then, when this optical disk was reproduced with a commercially available CD player (Aurex XR-V73, reproduction light wavelength λ = 780 nm), I obtained from the eye pattern of the reproduction signal
₁₁ / Itop was 0.63 and I ₃ / Itop was 0.32.

According to the CD standard, I ₁₁ / Itop is 0.6 or more, I ₃ / Itop is 0.3 to 0.7
The optical disc according to this embodiment satisfies this standard.

Further, when the protective layer 4, the light reflecting layer 3 and the light absorbing layer 2 of the optical disc after the recording were peeled off and the surface of the intermediate layer 6 was observed, optically modified convex pits 5 were formed there. Was confirmed.

(Example 2) In Example 1 above, the intermediate layer 6 has a heat distortion temperature.
ASTM D648 is 4.6 kg / cm ² at 80 ° C, Rockwell hardness ASTM is
An optical disk was produced in the same manner as in Example 1 except that the D785 was formed from a vinyl chloride copolymer of M95 (Eslec A manufactured by Sekisui Chemical Co., Ltd.) to a thickness of 60 nm.

An EFM signal was recorded on the optical disc thus obtained in the same manner as in Example 1 above, and then this optical disc was recorded.
When reproduced with a commercially available CD player, I ₁₁ / Itop obtained from the eye pattern of the reproduced signal was 0.66, and I ₃ / Itop was 0.35.

Furthermore, when the surface of the intermediate layer 6 after recording was observed in the same manner as in Example 1, it was confirmed that the optically modified convex pits 5 were formed therein.

(Example 3) In Example 1, the intermediate layer 6 has a heat distortion temperature.
ASTM D648 is 4.6 kg / cm ² at 90 ° C, Rockwell hardness ASTM is
D785 M100 acrylic resin (San Nopco SN-EX559
5), the thickness of the light absorption layer 2 was set to 130 nm, the silicon acrylic resin layer was not formed between the light absorption layer 2 and the light reflection layer 3, and the reflection layer 3 was made of Au. When
An optical disk was manufactured in the same manner as in Example 1 except that it was formed of a 9: 1 alloy film with Ir.

An EFM signal was recorded on the optical disc thus obtained in the same manner as in Example 1 above, and then this optical disc was recorded.
When reproduced with a commercially available CD player, I ₁₁ / Itop obtained from the eye pattern of the reproduced signal was 0.63, and I ₃ / Itop was 0.32.

Furthermore, when the surface of the intermediate layer 6 after recording was observed in the same manner as in Example 1, it was confirmed that the optically modified convex pits 5 were formed therein.

(Example 4) In Example 1 above, as the intermediate layer 6, a heat distortion temperature was used.
ASTM D648 is 4.6 kg / cm ² at 85 ℃, Rockwell hardness ASTM is
An optical disk was produced in the same manner as in Example 1 except that the D785 was formed of M70 polystyrene (ST-95 manufactured by Sanyo Kasei).

An EFM signal was recorded on the optical disc thus obtained in the same manner as in Example 1 above, and then this optical disc was recorded.
When reproduced with a commercially available CD player, I ₁₁ / Itop obtained from the eye pattern of the reproduced signal was 0.65, and I ₃ / Itop was 0.34.

Furthermore, when the surface of the intermediate layer 6 after recording was observed in the same manner as in Example 1, it was confirmed that the optically modified convex pits 5 were formed therein.

Example 5 In Example 1 above, the intermediate layer 6 has a heat distortion temperature.
ASTM D648 is 4.6 kg / cm ² at 55 ° C, Rockwell hardness ASTM is
D785 was used to form M60 polyvinyl acetate (Evaflex made by Mitsui Polychemicals) to a thickness of 60 nm.
An optical disk was manufactured in the same manner as in Example 1 except that the spin coating was performed in nm.

An EFM signal was recorded on the optical disc thus obtained in the same manner as in Example 1 above, and then this optical disc was recorded.
When reproduced with a commercially available CD player, I ₁₁ / Itop obtained from the eye pattern of the reproduced signal was 0.66, and I ₃ / Itop was 0.32.

Furthermore, when the surface of the intermediate layer 6 after recording was observed in the same manner as in Example 1, it was confirmed that the optically modified convex pits 5 were formed therein.

(Example 6) In Example 1 above, the intermediate layer 6 has a heat distortion temperature.
ASTM D648 is 4.6 kg / cm ² at 50 ° C, Rockwell hardness ASTM is
D60 was used to form M60 polyurethane resin (Nipporan 133 manufactured by Nippon Polyurethane Industry Co., Ltd. and Coronate L manufactured by the same company in a ratio of 1: 1) to a thickness of 50 nm. After spin-coating and solvent-resistant treatment, 1,1'dibutyl 3,3,3 ', 3'tetramethyl 4,5,4'5'dibenzoindodicarbocyanine perchlorate having a thickness of 130 nm was used. Light absorption layer 2
Except that a silicon acrylic resin was not coated between the light absorption layer 2 and the light reflection layer 3 and that the reflection layer 3 was formed of a 9: 1 alloy film of Au and Ir. An optical disk was manufactured in the same manner as in Example 1 above.

An EFM signal was recorded on the optical disc thus obtained in the same manner as in Example 1 above, and then this optical disc was recorded.
When reproduced with a commercially available CD player, I ₁₁ / Itop obtained from the eye pattern of the reproduced signal was 0.66, and I ₃ / Itop was 0.33.

Furthermore, when the surface of the intermediate layer 6 after recording was observed in the same manner as in Example 1, it was confirmed that the optically modified convex pits 5 were formed therein.

(Embodiment 7) In the above-mentioned Embodiment 1, the intermediate layer 6 has a heat distortion temperature.
ASTM D648 is 4.6 kg / cm ² at 50 ° C, Rockwell hardness ASTM is
D60 was used to form M60 polyurethane resin (Nipporan 133 manufactured by Nippon Polyurethane Industry Co., Ltd. and Coronate L manufactured by the same company in a ratio of 1: 1) to a thickness of 50 nm. After 15 nm spin coating and solvent-resistant treatment, 1,1'dibutyl 3,3,3 ',
The light absorbing layer 2 was formed using 3'tetramethyl 4,5,4'5 'dibenzoindodicarbocyanine perchlorate, and a silicon resin was formed on the light absorbing layer 2 instead of the silicon acrylic resin. And the light reflection layer 3
An optical disk was manufactured in the same manner as in Example 1 except that the protective layer 4 was provided on the polysulfide-added epoxy resin formed by 20 nm coding on the above.

An EFM signal was recorded on the optical disc thus obtained in the same manner as in Example 1 above, and then this optical disc was recorded.
When reproduced with a commercially available CD player, I ₁₁ / Itop obtained from the eye pattern of the reproduced signal was 0.66, and I ₃ / Itop was 0.33.

Furthermore, when the surface of the intermediate layer 6 after recording was observed in the same manner as in Example 1, it was confirmed that the optically modified convex pits 5 were formed therein.

(Embodiment 8) In the above Embodiment 1, the intermediate layer 6 has a heat distortion temperature.
ASTM D648 is 4.6 kg / cm ² at 60 ° C, Rockwell hardness ASTM is
D785 was formed from hydroxypropyl cellulose of M100, and as an organic dye forming the light absorption layer 2, 1.
1'dibutyl 3,3,3 ', 3' tetramethyl 4,5,
An optical disc was prepared in the same manner as in Example 1 except that 4′5 ′ dibenzoindodicarbocyanine perchlorate was used and that a silicone resin was coated on the light absorption layer 2 instead of the silicone acrylic resin. I made it.

An EFM signal was recorded on the optical disc thus obtained in the same manner as in Example 1 above, and then this optical disc was recorded.
When reproduced with a commercially available CD player, I ₁₁ / Itop obtained from the eye pattern of the reproduced signal was 0.65 and I ₃ / Itop was 0.32.

Furthermore, when the surface of the intermediate layer 6 after recording was observed in the same manner as in Example 1, it was confirmed that the optically modified convex pits 5 were formed therein.

(Example 9) In Example 1 above, the intermediate layer 6 has a heat distortion temperature.
ASTM D648 is 4.6 kg / cm ² at 50 ° C, Rockwell hardness ASTM is
D785 used M30 urethane thermoplastic resin (Nipporan 133 made by Nippon Polyurethane Industry Co., Ltd. and Coronate L made by the same company)
5: 1) to have a thickness of 50 nm, and a silicon-based coating agent was formed on the intermediate layer 6 by spin coating with a thickness of 15 nm and treated with a solvent to give 1,1′dibutyl 3,
Forming the light absorption layer 2 using 3,3 ', 3' tetramethyl 4,5,4'5'dibenzoindodicarbocyanine perchlorate, and forming a silicon resin by coating instead of the silicon acrylic resin An optical disk was manufactured in the same manner as in Example 1 except for the above.

An EFM signal was recorded on the optical disc thus obtained in the same manner as in Example 1 above, and then this optical disc was recorded.
When reproduced with a commercially available CD player, I ₁₁ / Itop obtained from the eye pattern of the reproduced signal was 0.67, and I ₃ / Itop was 0.34.

Furthermore, when the surface of the intermediate layer 6 after recording was observed in the same manner as in Example 1, it was confirmed that the optically modified convex pits 5 were formed therein.

(Example 10) In Example 1 above, as the intermediate layer 6, a heat distortion temperature was used.
ASTM D648 is 4.6 kg / cm ² at 70 ° C, Rockwell hardness ASTM is
D785 M90 acrylic resin (San Nopco SN-EX7052)
The light absorbing layer 2 having a thickness of 130 nm is formed by using 1,1′dipropyl 5,7,5 ′, 7′dimethoxyindodicarbocyanine fluoroborate as an organic dye.
Was formed, the light reflecting layer 3 was formed of a Cu film, and the protective layer 4 was formed of a silicon-based hard coat agent.
An optical disk was manufactured in the same manner as in Example 1 except that the thickness was 5 μm.

An EFM signal was recorded on the optical disc thus obtained in the same manner as in Example 1 above, and then this optical disc was recorded.
When reproduced with a commercially available CD player, I ₁₁ / Itop obtained from the eye pattern of the reproduced signal was 0.63, and I ₃ / Itop was 0.32.

Furthermore, when the surface of the intermediate layer 6 after recording was observed in the same manner as in Example 1, it was confirmed that the optically modified convex pits 5 were formed therein.

(Embodiment 11) In the above Embodiment 1, the intermediate layer 6 has a heat distortion temperature.
ASTM D648 is 4.6 kg / cm ² at 50 ° C, Rockwell hardness ASTM is
It was formed from M60 polyurethane resin with D785 (Nipporan 133 manufactured by Nippon Polyurethane Industry Co., Ltd. and Coronate L manufactured by the same company were mixed in a ratio of 1: 1). 5, 7, 5 ', 7'dimethoxyindodicarbocyanine fluoroborate was used, a SiO ₂ film having a thickness of 30 nm was provided on the light absorption layer 2 by a sputtering method, and the light reflection layer 3 was a Cu film. The protective layer 4 is formed on the light-reflecting layer 3 by spin-coating an epoxy resin with a thickness of 20 nm on the light-reflecting layer 3, and the protective layer 4 is made to have a thickness of 5 μm by a silicon-based hard coating agent.
An optical disk was manufactured in the same manner as in Example 1 except that the optical disk was formed.

An EFM signal was recorded on the optical disc thus obtained in the same manner as in Example 1 above, and then this optical disc was recorded.
When reproduced with a commercially available CD player, I ₁₁ / Itop obtained from the eye pattern of the reproduced signal was 0.66, and I ₃ / Itop was 0.33.

Furthermore, when the surface of the intermediate layer 6 after recording was observed in the same manner as in Example 1, it was confirmed that the optically modified convex pits 5 were formed therein.

Example 12 In Example 1, a glass disk was used as the translucent substrate 1, and the intermediate layer 6 had a heat distortion temperature ASTM D64.
8 is 4.6 kg / cm ² at 70 ° C, Rockwell hardness ASTM is D785 and M9
An acrylic resin with pregrooves formed on the surface of 0 by the 2p method (photo polymarization method) (made by San Nopco
SN-EX7052), as the organic dye forming the light absorption layer 2, 1, 1'dipropyl 5, 7, 5 ',
The light absorbing layer 2 was formed to a thickness of 130 nm using 7'dimethoxyindodicarbocyanine fluoroborate, the light reflecting layer 3 was formed of a Cu film, and the protective layer 4 was formed to a thickness of a silicon hard coat agent. An optical disc was manufactured in the same manner as in Example 1 except that the thickness was 5 μm.

An EFM signal was recorded on the optical disc thus obtained in the same manner as in Example 1 above, and then this optical disc was recorded.
When reproduced with a commercially available CD player, I ₁₁ / Itop obtained from the eye pattern of the reproduced signal was 0.63, and I ₃ / Itop was 0.32.

Furthermore, when the surface of the intermediate layer 6 after recording was observed in the same manner as in Example 1, it was confirmed that the optically modified convex pits 5 were formed therein.

(Comparative Example) In the above-mentioned Example 1, the intermediate layer 6 has a heat distortion temperature.
180 ° C at ASTM D648 of 4.6 kg / cm ² , Rockwell hardness ASTM
An optical disk was manufactured in the same manner as in Example 1 except that the material was D785 and was formed of an alkoxysilane-based silicon resin of M100.

An EFM signal was recorded on the optical disc thus obtained in the same manner as in Example 1 above, and then this optical disc was recorded.
When reproduced with a commercially available CD player, I ₁₁ / Itop obtained from the eye pattern of the reproduced signal was 0.28 and I ₃ / Itop was 0.05.

This optical disc cannot satisfy the above CD format.

[Effects of the Invention] As described above, according to the optical information recording medium and the recording method thereof of the present invention, the transparent substrate 1 is irradiated with the laser light.
Since the pits can be formed in the intermediate layer 6 formed on the above and the reflection layer 3 can be formed in close contact with the back of the light absorption layer 2, a pit form and a layer structure optically similar to CD can be formed. Can be taken.

In particular, since the intermediate layer 6 having a relatively low heat distortion temperature or a low hardness is formed on the transparent substrate 1,
Due to the energy generated in the light absorption layer 2 by the irradiation of the laser beam, a clear pit can be formed in the intermediate layer 6, and a reproduction signal having a high degree of modulation can be obtained.

[Brief description of drawings]

FIG. 1 is a schematic half cross-sectional perspective view showing an example of the structure of an optical information recording medium, FIG. 2 is an enlarged view of part A before optical recording of FIG. 1,
FIG. 3 is an enlarged view of part A after optical recording in FIG. 1, and FIG.
An enlarged sectional view of an essential part of an optical disc before optical recording showing another example,
FIG. 5 is an enlarged cross-sectional view of a main part of the optical disc after optical recording. 1 ... Substrate, 2 ... Light absorbing layer, 3 ... Reflective layer, 4 ... Protective layer

Front page continuation (72) Inventor Takashi Ishiguro 6-16-20 Ueno Taito-ku, Tokyo Within Taiyo Denki Co., Ltd. (56) Reference JP-A-58-189851 (JP, A)

Claims (2)

[Claims] 1. A light absorbing layer 2 which absorbs a laser beam through another layer on a transparent substrate 1, and a laser beam which is provided on the light absorbing layer 2 directly or through another layer. In the optical information recording medium having a light reflection layer 3 that reflects light, the light absorption layer 2 contains a material that generates heat and increases pressure when irradiated with a laser beam, and the light absorption layer 2 and the transparent substrate 1 The intermediate layer 6 is interposed between the intermediate layer 6 and
An optical information recording medium characterized by having a D785 of M100 to 50. 2. The heat distortion temperature of the intermediate layer 6 is ASTM D648 4.6 Kg /
The optical information recording medium according to claim 1, wherein the optical information recording medium has a temperature of 50 to 150 ° C. in cm ² .