JPH05254253A - Optical recording/reproducing device - Google Patents

Abstract

PURPOSE:To enable high sensitivity writing at DC linear velocity by arranging a means for optically recording/reproducing data on an optical recording medium containing a compd. expressed by a specific formula and a means for rotating the reproducing means. CONSTITUTION:An optical recording/reproducing device is equipped with an optical recording/reproducing means equipped with a laser oscillator for optically recording/reproducing data on an optical recording medium having an optical recording layer containing one or more kind of a compd. expressed by formula I (wherein M1 is Si, Ge or Sn, z1, z2, z3 and z4 are a ring non-substituted or having one or more substituent X selected from a nitrogen-containing aromatic ring, a benzene ring, a naphthalene ring and a pyridine ring, X is a 1-20C alkyl group or an alkenyl group and Y<1> and Y<2> are Ar) and one or more kinds of compds. expressed by formula II (wherein M is a transition metal, z1, z2, z3 and z4 are a pyridine ring non-substituted or having one or more monovalent substituent X and X is a 1-20C aromatic hydrocarbon group), a means for rotating the reproducing means, a drive circuit, a processor and an output means for outputting data from the processor.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical recording / reproducing apparatus for recording / reproducing information with a laser beam.

[0002]

2. Description of the Related Art Recently, it has been proposed to use a semiconductor laser beam as a light source for writing or reading on a compact disc (CD), a video disc or the like. In order to write or read with semiconductor laser light, a recording medium that absorbs semiconductor laser light, that is, near infrared light is required. As the recording medium, those using an inorganic recording layer such as tellurium, tellurium alloy, and bismuth alloy, phthalocyanine dyes (US Pat. No. 4,298,975), and naphthalocyanine dyes (US Pat. No. 4,492) are used. , 750) are being studied.

Further, as the recording / reproducing apparatus, the rotational speed of the optical disk medium at the time of data recording is made faster than the rotational speed of the optical disk medium at the time of data recording, thereby improving the data transfer rate and enhancing the processing efficiency of the computer system. A method has been proposed (JP-A-2-206060).

Further, a CD-R has been proposed as a write-once optical disc satisfying the CD standard. In this structure, an organic dye layer (recording layer) is provided between the substrate and the reflective layer, and the user can record only once in that portion.

Recording on these optical recording media is performed by irradiating the optical recording layer with a laser beam from the substrate side to form pits having a diameter of about 1 μm. For recording and reproduction, a reproduction signal is obtained by irradiating the optical recording layer with a laser beam that passes through the substrate from the pickup and has lower energy than during recording, and detects the difference in reflectance between the recording layer and the pits. ..

[0006]

However, the optical recording medium having the above-mentioned inorganic recording layer has a CD linear velocity (CD standard:
At present, the reproduction light stability of 1.2 to 1.4 m / s is good, but since the means for forming a thin film on the substrate which is the recording layer must be performed in vacuum such as vacuum deposition and sputtering. It is difficult to improve productivity, and since the thermal conductivity of the recording layer is large, a large power laser beam is required for writing. In addition, there is a limit in improving the recording density, and there is a problem in safety and hygiene since toxic substances such as tellurium and selenium are handled.

On the other hand, an optical recording medium having an organic dye as a recording layer has not yet been obtained in terms of durability and reflectance in terms of characteristics equivalent to those of an optical recording medium having an inorganic recording layer. Furthermore, although it is the current situation that compatibility of durability and solvent resistance of the organic recording medium is not easy, various studies have been conducted because it is considered that the organic recording medium has a possibility of overcoming the above-mentioned problems. ing. That is, an organic recording medium having characteristics equivalent to those of the inorganic recording medium and capable of spinner coating and dip coating, which is impossible with the inorganic recording medium, has been searched for. For example, the central metal is Al, Ga, In, Te, S
An optical recording medium composed of an organic thin film containing various derivatives of i, Ge, Sn, Pb and the like (Japanese Patent Laid-Open No. Hei 1-198391) has been proposed. However, the organic recording medium also has a problem in use at the CD linear velocity because the recording layer may be damaged by the reproduction light at the CD linear velocity. Further, although it is possible to make the rotation speed at the time of reproduction faster than the rotation speed at the time of recording, it was still impossible to sufficiently reduce the influence of the reproduction light on the organic recording layer.

Further, in the write-once type CD-R capable of recording / reproducing at a CD linear velocity of, for example, 1.3 m / s, a laser power of 7 to 9 mW for recording and a laser power of 2.1 mW for reading are 20,000. It is possible to read more than once [NIK
KEI ELECTRONICS 1988.10.3 (No. 45
7) page 100]. However, although the reading laser power is 2.1 mW and the reproduction light stability is good, the sensitivity is lowered due to the effect of heat diffusion to the reflective layer of the recording medium, and the recording laser power is too large. Further, as an optical disk, a reflective layer is required to obtain a high reflectance, which results in a vacuum dry process, resulting in poor productivity.

It is an object of the present invention to provide an optical recording / reproducing apparatus using an organic optical recording layer capable of high-sensitivity writing at a CD linear velocity and having little deterioration of the recording layer due to reproducing light.

[0010]

DISCLOSURE OF THE INVENTION The inventors of the present invention have conducted various studies to solve the above problems of a recording medium having good recording and reproducing characteristics at a CD linear velocity, and as a result, have high sensitivity at a CD linear velocity. Thus, the present invention has been accomplished by finding an optical recording medium having excellent reproduction light stability. The gist of the present invention is as follows.

An optical recording / reproducing means having a laser oscillator for optically recording / reproducing information on / from an optical recording medium having an optical recording layer, a rotating means for rotating the optical recording medium, the optical recording / reproducing means and the rotating means. An optical recording / reproducing apparatus comprising: a drive circuit for controlling the drive circuit, a processor for giving a command to the drive circuit, an input unit for inputting information to the processor, and an output unit for outputting information from the processor, The optical recording layer of the recording medium comprises an organic recording layer containing a heat quencher, and the linear velocity of the optical recording layer at the time of recording is C
An optical recording / reproducing apparatus characterized in that the linear velocity of D (Compact Disk) and the linear velocity at the time of reproducing are recorded and reproduced at a linear velocity which does not deteriorate the optical recording layer by reproducing light.

The optical recording layer has the general formula (1)

[0013]

[Chemical 3]

[Wherein M ₁ is a group IV metal selected from Si, Ge, and Sn, and Z ₁ Z ₂ Z ₃ and Z ₄ are nitrogen-containing aromatic compounds having one or more unsubstituted or monovalent substituents X] Ring, benzene ring, naphthalene ring, pyridine ring, X is 1 to 20 carbon atoms
Of the alkyl group, alkenyl group, alkylthio group, cycloalkylthio group, phenyl group, mono-substituted phenyl group, acyl group or tri-substituted silyl group of Y ¹ and Y ² are Ar and O.
R, OAr, OSi (R) ₃ , OSi (OR) ₃ , OSi (O
Ar) ₃ and OC (C ₆ H ₅ ) ₃ (where R is a carbon number of 1 to 20)
In the above formula, Ar is a phenyl group, a substituted phenyl group, a benzyl group or a substituted benzyl group), and both may be the same. ] At least one azaphthalo, phthalo or naphthalocyanine derivative represented by the general formula (2)

[0015]

[Chemical 4]

[Wherein M represents a transition metal, Z ₁ , Z ₂ , Z ₃
And Z ₄ represents a pyridine ring, a benzene ring or a naphthalene ring having one or more unsubstituted or monovalent substituents X, and X represents an alkyl group having 1 to 20 carbon atoms, an alkenyl group, an alkylthio group, an aromatic hydrocarbon group ( For example, an unsubstituted phenyl group, monosubstituted phenyl group, there is disubstituted phenyl group, -NO ₂ and the substituent _{group, -NH 2, - (CH 2} ) n_ 1 CH 3;
n represents 1 to 5), an acyl group or a tri-substituted silyl group. ] At least 1 sort (s) of the compound represented by these are included.

FIG. 1 shows a schematic side sectional view of an optical recording medium used in the present invention. A chemistry in which a substituent that can inhibit intermolecular interaction is introduced when the compound used for the optical recording layer 11 forms a solid film on the substrate 10, and the compound further reduces the symmetry of the molecule. Have a structure. Specifically, a substituent such as a trialkylsiloxy group or a phenoxy group that does not overlap the π electrons of the aromatic ring of the azaphthalo, phthalo or naphthalocyanine derivative is introduced. The chemical structure that reduces the symmetry of the molecule is to reduce the symmetry of D ₄ h by simultaneously using the phthalonitrile derivative and the 2,3-dicyanonaphthalene derivative with phthalo and naphthalocyanine. In FIG. 1, the protective layer 12 is formed on the optical recording layer 11.
It shows the case where is formed.

The optical recording medium is recorded by forming pits when the optical recording layer is melted, sublimated, or thermally decomposed and vaporized by irradiation with laser light as recording light.

The present invention also relates to the above general formulas (1) and (2).
Using a solution of the mixture of 0.1 to 5% by weight dissolved in a solvent, a thin film is formed on a substrate by a method such as spinner coating, spray coating or dip coating, and then the solvent is removed to form an optical recording layer. It can be easily formed. As the optical recording layer, an optical recording medium having excellent durability (reproduction light stability) superior to that of the conventional inorganic recording layer can be obtained, and the optical recording medium having excellent productivity by the spin coating method or the like which cannot be obtained by the inorganic recording layer. Can be provided.

In the present invention, the mixing ratio of the azaphthalo-, phthalo- or naphthalocyanine-based derivative of the general formula (1) and the compound of the general formula (2) having the action of a thermal quencher is 1 part by weight of the former. The latter 0.01 to 1.5 parts by weight is preferred. In particular, it is desirable that the mixing ratio is such that the reflectance of the optical recording layer is 20% or more.

The compound having the thermal quencher action forms an aggregate by overlapping of π electrons even in a solution state. In the thin film state, an aggregate in which several molecules are gathered is further formed and exists in a dispersed state in the recording layer. As a result, in the process where heat radiation occurs from the excited state after the recording layer absorbs light,
π electron overlapping occurs and heat diffusion occurs to the heat quencher where there are many energy levels,
Thermal stability is improved. Further, by dispersing the associated molecules in the film, a heat dissipation effect such as an increase in heat capacity can be expected.

A preferred combination of the above general formulas (1) and (2) is bis (tributyrosiloxy) silicon-
Tetra (trimethylsilyl) naphthalocyanine and tetra (t-butyl) copper naphthalocyanine, bis (triethylsiloxy) silicon-tetra (trimethylsilyl) naphthalocyanine and tetra (t-butyl) copper naphthalocyanine, bis (tributyrosiloxy) silicon-tetra (Cyclohexylthio) naphthalocyanine and tetra (t-butyl) copper naphthalocyanine, bis (triethylsiloxy) silicon-tetra (cyclohexylthio) naphthalocyanine and tetra (t-butyl) copper naphthalocyanine,
Bis (triethylsiloxy) silicon-tetra (t-butyl) phthalocyanine and tetra (t-butyl) silicon-phthalocyanine, bis (phenoxy) silicon-tetra (t-butyl) phthalocyanine and tetra (t-butyl) silicon-phthalocyanine, or Alternatively, the central metal silicon may be germanium.

As the substrate of the optical recording medium, vinyl chloride resin, acrylic resin, polyolefin resin, polycarbonate resin, polyvinyl acetal resin, unsaturated polyester resin, vinyl ester resin, polystyrene resin, polyether sulfone resin, polyether ether are used. Ketone resin, epoxy resin, allyl resin, polyimide,
Thermoplastic or thermosetting resin such as polyamide, inorganic polymer such as silicone resin and phosphazene resin, glass, SiO ₂ , Si ₃ N ₄ , metal, etc. can be used to make film, sheet, cylinder, etc. Used by molding. The substrate preferably has a light transmittance of 85% or more and a small optical anisotropy for writing and reading signals.

The film thickness of the optical recording layer formed on the above substrate may be in the range of 20 to 500 nm. However, in the optical recording layer containing a compound whose absorption wavelength of the recording layer is slightly deviated from the laser wavelength, the interference effect of reflectance due to the film thickness is large. Therefore, it is preferable to use the film thickness region where the reflectance is large. A first interference film thickness region (30 to 80 nm) having a high reflectance and a low absorptance is desirable.

As the laser light to be used, laser light of N ₂ , He-Ne, Ar, dye, semiconductor or the like can be selected according to the absorption wavelength of the recording layer. Recording and reproduction can be performed with a semiconductor laser having a wavelength of 780 to 830 nm when the optical recording layer is a naphthalocyanine mixture, and with a semiconductor laser having a wavelength of 670 to 780 nm when the optical recording layer is azaphthalo and a phthalocyanine mixture. Laser power is 2-5m for recording light
W, reproduction light can be performed at 0.2 to 1 mW. The mixture ratio of azaphthalo, phthalo, and naphthalocyanine is preferably such that the reflectance from the substrate side is 20% or more.

The optical recording layer can be obtained by forming a thin film on the substrate using a usual spin coating, spray coating or dip coating apparatus. The compound represented by the general formula (1) or the general formula (2) may be mixed, or a binder may be added to the compound to be dissolved in a solvent, or may be applied in a dispersed state.

In the above optical recording medium, a protective layer may be formed on the optical recording layer formed on the substrate. As the protective layer, it is preferable to form a coating film of an organic polymer material on the optical recording layer whose surface is modified by plasma treatment. These protective layers are selected according to required properties such as abrasion resistance, heat resistance and water resistance. Further, two or more protective layers may be formed by using different kinds of materials. A crosslinking agent or the like may be added to improve the properties of these protective layers.

Examples of the material for the protective layer include polyvinyl alcohol, polyacrylic acid, polyvinylpyrrolidone, polychitosan and polyethylene glycol. Further, there are latexes by emulsion polymerization, such as polymethylmethacrylate, polyethylmethacrylate, polybutylmethacrylate, polystyrene and polymethylacrylate. These may be a homopolymer, a copolymer or a mixture thereof.

FIG. 2 shows a block diagram of an optical recording / reproducing apparatus using the optical recording medium of the present invention. An optical head having a laser oscillator for recording / reproducing information on / from an optical recording medium (optical disc) and a rotating means (motor) for rotating the optical recording medium are provided. A drive circuit for driving and controlling the rotating means and the optical head gives a command by a processor. The processor is provided with input means for inputting external information and output means for outputting information from the processor.

The optical recording medium of the present invention has a linear velocity of C during reproduction.
It is possible to provide the one having a memory device function of temporarily storing the reproduced data in the semiconductor memory by utilizing the characteristic that the transfer speed is high because of the D linear velocity.

FIG. 3 is a block diagram of the optical system of the optical recording / reproducing apparatus of the present invention. A laser beam 9 emitted from the semiconductor laser 1 is shaped by a collimator lens 2 and a shaping prism 3, passes through a polarization beam splitter 4, and has a wavelength of λ.
It passes through the quarter wave plate 6 and hits the optical disc 8 to be reflected. The reflected light again passes through the λ / 4 wave plate 6 and reaches the detector 5 by the polarization beam splitter 4.
The polarization beam splitter 4 prevents the reflected light from returning to the semiconductor laser source and efficiently guides it to the detector 5.

[0032]

In the recording / reproducing apparatus using the organic material of the present invention as an optical recording medium, the linear velocity at the time of recording is a linear velocity at the CD, and the linear velocity at the time of reproducing is a line at which the recording layer of the optical recording medium is not deteriorated by the reproducing light. Good recording and reproducing characteristics can be obtained by performing at a speed.

This is because the optical recording layer contains the compound of the general formula (1) and the compound of the general formula (2) that acts as a thermal quencher, and thus exhibits excellent stability against laser light. Is.

As a result, it is possible to write with a low laser power of 2.5 mW, which could not be realized with an inorganic material, for example, and to read with a relatively large reproduction light of 1 mW.

Further, it is possible to provide excellent stability against deterioration of the optical recording layer due to sunlight, which has been a problem in the CD-R organic recording medium.

[0036]

【Example】

[Example 1] Bis (tributylsiloxy) silicon-tetra (trimethylsilyl) naphthalocyanine and copper tetra-t-butylnaphthalocyanine were tetrachloride in a weight ratio of 1: 0.75 on a polycarbonate substrate having a thickness of 1.2 mm. It was dissolved in carbon to form an optical recording layer having a film thickness of 43 nm and used as an optical recording medium.

The wavelength 83 of the optical recording layer of the obtained optical recording medium
The reflectance from the substrate side at 0 nm was 32%.
The output light of a semiconductor laser having a wavelength of 830 nm is condensed on the optical recording medium to a spot diameter of 1.2 μm, and the linear velocity is 1.3 m / s and the output is 2.5 mW.
After writing the signal, the linear velocity was 2.0 m / s.
It was read with a reproduction light of 5 mW. The reproduction C / N ratio was 51 dB. Fig. 4 shows C / N (Carrier to Noise rati
The laser power dependence of o) is shown. Good C / N values were obtained in the region of low laser power where writing was difficult with inorganic materials.

Example 2 Bis (tributylsiloxy) germanium-tetra (trimethylsilyl) naphthalocyanine and copper tetra-t-butylnaphthalocyanine were mixed in a weight ratio of 1: 2 on a polycarbonate substrate having a thickness of 1.2 mm.
It was dissolved in carbon tetrachloride at 0.8 and an optical recording layer having a film thickness of 45 nm was formed to obtain an optical recording medium. When the surface of this optical recording layer was irradiated with nitrogen plasma for 1 minute, the contact angle decreased to 32 degrees. In addition, the above-mentioned nitrogen plasma is a plasma chamber (P
C-101L: Yamato Scientific Co., Ltd. and plasma controller (R
FG-500A: manufactured by Yamato Scientific Co., Ltd., and the degree of vacuum is 0.2.
Torr was performed at an output of 200W.

Then, a 2% by weight aqueous solution of polyvinyl alcohol was dropped on the optical recording layer, applied by a spin coating method rotating at 2000 rpm, and dried at room temperature to form a protective layer. The reflectance of the obtained disk from the substrate side at a wavelength of 830 nm was 29%.

A wavelength of 830 nm is formed on the optical recording medium.
The output light of the semiconductor laser is focused on a spot diameter of 1.2 μm, and a signal with a recording frequency of 0.7 MHz is written from the substrate side at a linear velocity of 1.3 m / s and an output of 3 mW, and then a linear velocity of 3. When read with 0.5 mW of reproducing light at 0 m / s, the reproducing C / N ratio was 52 dB. Good C / in the low laser power range where writing is difficult with inorganic materials
An N value was obtained.

Comparative Example 1 Bis (tributylsiloxy) germanium-tetra (octylooxycarbonyl) naphthalocyanine was dissolved in carbon tetrachloride on a polycarbonate substrate having a thickness of 1.2 mm to form an optical recording layer having a thickness of 53 nm. It was used as an optical recording medium. The reflectance of the optical recording layer of the obtained optical recording medium from the substrate side at a wavelength of 830 nm is 38.
%Met.

A wavelength of 830 nm is formed on the optical recording medium.
The output light of the semiconductor laser is focused to a spot diameter of 1.2 μm, and a signal with a recording frequency of 0.7 MHz is written from the substrate side at a linear velocity of 1.3 m / s and an output of 2 mW, and then 0.5 mW. When read with the playback light, playback C /
The N ratio was 42 dB. However, since the linear velocity is the same as during recording, the reproducing light causes thermal deterioration in the optical recording layer, and C / N
The ratio has dropped.

Comparative Example 2 Bis (tributylsiloxy) germanium-tetra (trimethylsilyl) naphthalocyanine and copper tetra-t-butylnaphthalocyanine were mixed in a weight ratio of 1: 2 on a polycarbonate substrate having a thickness of 1.2 mm.
It was dissolved in carbon tetrachloride at 0.8 and an optical recording layer having a film thickness of 45 nm was formed to obtain an optical recording medium. The reflectance of the optical recording layer of the obtained optical recording medium from the substrate side at a wavelength of 830 nm is 3
It was 1%.

The output light of a semiconductor laser having a wavelength of 830 nm was condensed on the above optical recording medium to a spot diameter of 1.2 μm, and the linear velocity was 8.0 m / s and the output was 9 mW from the substrate side.
When a signal of 7 MHz was written and read with a reproducing light of 0.5 mW, the reproducing C / N ratio was 49 dB. However, since the linear velocity was the same as that at the time of recording, the optical recording layer was deteriorated by the reproducing light and the C / N ratio was lowered.

Example 3 Bis (tripropylsiloxy) silicon-tetra (cyclohexylthio) naphthalocyanine and zinc tetra-t-butylnaphthalocyanine were used on a polycarbonate substrate having a thickness of 1.2 mm, as shown in Table 1. The optical recording layer was formed by dissolving in carbon tetrachloride.

Table 1 shows the mixing ratio of dyes, film thickness, and wavelength 83.
The reflectance at 0 nm is also shown. For each medium thus produced, the output light of a semiconductor laser with a wavelength of 830 nm was focused on a spot system with a diameter of 1.2 μm to obtain a linear velocity of 1.3 m /
s, output 2.5mW, recording frequency 0.7MHz from substrate side
I wrote the signal. Furthermore, linear velocity of 3.0 m / s
The reproducing C / N ratio was measured at each mixing ratio using 0.5 mW of reproducing light. The results are shown in Table 1. The mixing ratio is
When the ratio exceeds 1: 1.5, the reflectance becomes 20% or less and cannot be detected.

[0047]

[Table 1]

Example 4 Bis (tributylsiloxy) germanium-tetra (t-butyl) phthalocyanine and palladium tetra-t-butylphthalocyanine were mixed on a polycarbonate substrate having a thickness of 1.2 mm in a weight ratio of 1:
It was dissolved in carbon tetrachloride at 0.8 and an optical recording layer having a film thickness of 46 nm was formed to obtain an optical recording medium. The reflectance of the optical recording layer of the obtained optical recording medium from the substrate side at a wavelength of 780 nm is 3
It was 1%.

The output light of a semiconductor laser having a wavelength of 780 nm was condensed on the optical recording medium to form a spot diameter of 1.0 μm, and the linear velocity was 1.3 m / s and the output was 3 mW from the substrate side.
After writing the 7MHz signal, the linear velocity is 3.0m.
When read with 0.5 mW playback light at / s, playback C
The / N ratio was 49 dB.

Example 5 Bis (triethylsiloxy) germanium-tetra (t-butyl) phthalocyanine and copper tetra-t-butylphthalocyanine were mixed on a polycarbonate substrate having a thickness of 1.2 mm in a weight ratio of 1: 0.8. Was dissolved in carbon tetrachloride to form an optical recording layer having a film thickness of 45 nm to obtain an optical recording medium. After that, a protective film was formed in the same manner as in Example 2. The wavelength 78 of the optical recording layer of the obtained optical recording medium
The reflectance from the substrate side at 0 nm was 29%.

The output light of a semiconductor laser having a wavelength of 780 nm was condensed on the optical recording medium to a spot diameter of 1.0 μm in diameter, and the linear velocity was 1.3 m / s and the output was 3 mW.
After writing the 7MHz signal, the linear velocity is 3.0m.
When read with 0.5 mW playback light at / s, playback C
The / N ratio was 46 dB.

Example 6 Bis (triethylsiloxy) germanium-tetra (t-butyl) phthalocyanine and zinc tetra-t-butylphthalocyanine were used on a polycarbonate substrate having a thickness of 1.2 mm, as shown in Table 2. An optical recording layer was formed by dissolving in carbon tetrachloride at the ratio shown.

Table 2 shows the mixing ratio of dyes, film thickness, and wavelength 78.
The reflectance at 0 nm is also shown. For each medium thus produced, the output light of a semiconductor laser with a wavelength of 780 nm was focused on a spot system with a diameter of 1.2 μm to obtain a linear velocity of 1.3 m /
s, output 2.5mW, recording frequency 0.7MHz from substrate side
I wrote the signal. Furthermore, linear velocity of 3.0 m / s
The reproducing C / N ratio was measured at each mixing ratio using 0.5 mW of reproducing light. The results are shown in Table 2. The mixing ratio is
When the ratio exceeds 1: 1.5, the reflectance becomes 20% or less and cannot be detected.

[0054]

[Table 2]

Example 7 An optical recording layer was formed on a polycarbonate substrate having a thickness of 1.2 mm by using the combination of compounds shown in Table 3. The mixing ratio of the following compounds was 1: 0.5.

(A) Bis (tributyrosiloxy) silicon-tetra (trimethylsilyl) naphthalocyanine and tetra (t-butyl) copper naphthalocyanine (b) Bis (triethylsiloxy) silicon-tetra (trimethylsilyl) naphthalocyanine and tetra (t) −
Butyl) copper naphthalocyanine (c) bis (tributyrosiloxy) silicon-tetra (cyclohexylthio) naphthalocyanine and tetra (t
-Butyl) copper naphthalocyanine (d) bis (triethylsiloxy) silicon-tetra (cyclohexylthio) naphthalocyanine and tetra (t
-Butyl) copper naphthalocyanine (e) bis (triethylsiloxy) silicon-tetra (t-butyl) phthalocyanine and tetra (t-butyl)
Silicon-phthalocyanine (f) bis (phenoxy) silicon-tetra (t-butyl) phthalocyanine and tetra (t-butyl) silicon-
Phthalocyanine.

Table 3 shows the film thickness and the reflectance at a wavelength of 780 nm. A signal with a recording frequency of 0.7 MHz was written from the substrate side at a linear velocity of 1.3 m / s and an output of 2.5 mW. Further, the reproduction C / N ratio at each mixing ratio was measured using reproduction light of 0.5 mW at a linear velocity of 3.0 m / s.

[0058]

[Table 3]

[0059]

The optical recording / reproducing apparatus of the present invention can use a semiconductor laser having a low laser power as a light source by recording at a CD linear velocity and reproducing at a linear velocity higher than during recording. .. Therefore, an optical recording / reproducing device with low power consumption can be provided.

[Brief description of drawings]

FIG. 1 is a schematic side sectional view showing a configuration of an optical recording medium.

FIG. 2 is a configuration diagram showing a configuration of a recording / reproducing apparatus.

FIG. 3 is a configuration diagram of an optical system using a semiconductor laser of a recording / reproducing apparatus.

FIG. 4 is a graph showing laser power dependence of C / N.

[Explanation of symbols]

1 ... Semiconductor laser, 2 ... Collimator lens, 3 ... Shaping prism, 4 ... Polarization beam splitter, 5 ... Detector, 6 ... Quarter wave plate, 7 ... Objective lens, 8 ... Disk, 9 ... Laser light, 10 ... Substrate, 11 ... Optical recording layer,
12 ... Protective layer.

 ─────────────────────────────────────────────────── --- Continuation of the front page (72) Inventor Shuji Imaseki 4026 Kuji Town, Hitachi City, Hitachi, Ibaraki Prefecture, Hitachi Research Institute, Ltd. (72) Kenji Murao 4026 Kuji Town, Hitachi City, Ibaraki Prefecture, Hitachi Institute, Ltd. Hitachi Research Laboratory

Claims (11)

[Claims] 1. An optical recording / reproducing device having a laser oscillator for optically recording / reproducing information on / from an optical recording medium having an optical recording layer, a rotating device for rotating the optical recording medium, the optical recording / reproducing device and the rotating device. An optical recording / reproducing device comprising a drive circuit for controlling the means, a processor for giving a command to the drive circuit, an input means for inputting information to the processor, and an output means for outputting information from the processor, The optical recording layer of the optical recording medium is an organic recording layer containing a thermal quencher, and the linear velocity of the optical recording layer during recording is C
An optical recording / reproducing apparatus characterized in that the linear velocity of D (Compact Disk) and the linear velocity at the time of reproducing are recorded and reproduced at a linear velocity which does not deteriorate the optical recording layer by reproducing light. 2. The optical recording layer has the general formula (1): [In the formula, M ₁ is a group IV metal selected from Si, Ge and Sn, and Z ₁ Z ₂ Z ₃ and Z ₄ are nitrogen-containing aromatic rings having one or more unsubstituted or monovalent substituents X, benzene Ring, naphthalene ring, pyridine ring, X is an alkyl group having 1 to 20 carbon atoms,
An alkenyl group, an alkylthio group, a cycloalkylthio group, a phenyl group, a monosubstituted phenyl group, an acyl group or a trisubstituted silyl group, and Y ¹ and Y ² are Ar, OR, OAr, O
Si (R) ₃ , OSi (OR) ₃ , OSi (OAr) ₃ and O
_{C (C 6 H 5) 3} ( where R is a linear or branched alkyl group having 1 to 20 carbon atoms, Ar is a phenyl group, a substituted phenyl group, benzyl group or substituted benzyl group) both showed a may be the same. ] At least one azaphthalo, phthalo or naphthalocyanine derivative represented by the general formula (2) [Wherein M is a transition metal, Z ₁ , Z ₂ , Z ₃ and Z ₄ are pyridine rings having one or more unsubstituted or monovalent substituents X,
Benzene ring or naphthalene ring, X is 1 to 20 carbon atoms
Is an alkyl group, an alkenyl group, an alkylthio group, an aromatic hydrocarbon group, an acyl group or a tri-substituted silyl group. ] At least 1 sort (s) of the compound represented by these is included, The optical recording / reproducing apparatus of Claim 1 characterized by the above-mentioned. 3. The optical recording / reproducing apparatus according to claim 1, wherein the optical recording layer is formed on a substrate, and the optical recording layer is protected by a protective layer. 4. The optical recording layer contains an azaphthalo, phthalo, or naphthalocyanine derivative in an amount capable of making the reflectance of the optical recording layer 20% or more.
Or the optical recording / reproducing apparatus according to the item 3. 5. The optical recording layer contains 0.01 to 1.5 parts of the compound represented by the general formula (1) with respect to 1 part by weight of the azaphthalo, phthalo, or naphthalocyanine derivative represented by the general formula (1).
3. The composition is contained in a ratio of parts by weight.
Or the optical recording / reproducing apparatus according to the item 3. 6. The optical recording / reproducing apparatus according to claim 1, wherein the film thickness of the optical recording layer is in a first interference film thickness region of light reflectance. 7. The optical recording / reproducing apparatus according to claim 1, wherein the optical recording medium has a reflective layer. 8. The optical recording / reproducing apparatus according to claim 1, further comprising a semiconductor memory for temporarily storing reproduction data. 9. An intensity of 2 when recording on the recording surface of the optical recording medium.
The optical recording / reproducing apparatus according to claim 1, wherein the optical recording / reproducing apparatus has a power of ˜5 mW and a power of 0.2-1 mW during reproduction. 10. The optical recording / reproducing apparatus according to claim 9, wherein the laser light for recording / reproducing has an oscillation wavelength of 600 to 720 nm or 780 to 830 nm. 11. The recording layer is irradiated with laser light,
2. The recording is performed by melting, sublimating or decomposing and vaporizing the optical recording layer on a recording medium.
10. The optical recording / reproducing device according to any one of 10 to 10.