CN1831983A - Dye for improving optical disk track-seeking signal - Google Patents

Abstract

A dye - stuff for improving track - seeking signal of optical disc is prepared as laying a dye layer and a reflection layer on base plate of optical disc, using an a 20 - compound embedded on metal as dye layer with a 20 - compound being formed by metal ion, alkyl with C1 - C6 , amido with C1- C6 , hydrogen, hydroxyl, halogen, etherate and heterocyclic derivative with carbon atom as well as nitrogen atom.

Description

Improve the dyestuff of CD tracking signal

The application is that application number is " 02140511.5 ", and the applying date is " on July 5th, 2002 ", and invention and created name is divided an application for the patented claim of " improving the method and the dyestuff thereof of CD tracking signal ".

Technical field

The present invention is relevant for a kind of method and dyestuff thereof that improves CD tracking signal, particularly about a kind of record dispensable mould Digital video disc (DVD-R that only can write; Digital Versatile DiscRecordable) the improvement method of track-seeking signal.

Background technology

Along with the arriving of digital Age, under the very popular market trend of multimedia, networking products, the consumer obviously improves for the requirement of computer data storage, and memory capacity all is to consider emphasis as for safety and convenience such as.Just under such requirement, can write the best sharp weapon that record type Digital video disc is defined as mass data preservation and film recording.Wherein, only write record dispensable mould digital audio-video optical record medium since the manufacture craft technology type like CD-R (Compact Disc Recordable) CD, cost is relatively low, so more paid attention on developing.

The manufacture craft technology of DVD-R discs mainly is to be based on the manufacture craft basis of CD-R CD, its difference is that the manufacture craft of DVD-R discs is at first to penetrate a plastic material substrate that has formed the about 0.6mm of spiral grooves thickness, its material can be polycarbonate (Polycarbonate, abbreviation PC), acryl resin, methacrylic resin, Corvic, polyimide resin, epoxy resin etc., and based on the consideration of hanging down moisture absorption, low cost, the high grade of transparency and high production, selecting PC mostly for use is baseplate material.Afterwards again with the mode of rotary coating be coated with last layer comprise maximum absorption wavelength at the dye coating of the dyestuff of 500～650nm on substrate, to write recording use once as the DVD-R disc.Afterwards, plate layer of metal, as gold (Au), silver (Ag), aluminium (Al) and alloy thereof etc., as the usefulness in reflection horizon with the method for vacuum splashing and plating.Then fit together with the PC cover plate of another sheet 0.6mm again and form the thick disc of 1.2mm.Yet in the manufacture craft of CD-R CD, its substrate thickness is about 1.2mm, just is coated with last layer ultraviolet light photopolymerization resin after the reflection horizon on sputter, as the usefulness of protective seam.Therefore CD-R and a DVD-R notable difference in appearance are that two 0.6mm PC plates applyings form at DVD-R promptly, and the CD-R PC substrate that to be a 1.2mm thick is made.

So-called CD-R and DVD-R rotary coating manufacture craft, mainly be to be coated on dyestuff on the substrate uniformly, and control in the groove (Groove) and the amount of dye on the so-called land (Land) between groove and groove by setting suitable painting parameter, to reach the purpose of optical path difference (Ld) between control groove and land.Optical path difference can directly have influence on the track-seeking signal and the compatibility of disc between the groove of disc and land, also just influences the record quality of disc certainly.

Can design in theory substrate ditch groove depth wide, select appropriate solvent or select the optical path difference of mode such as suitable dyestuff with the control disc, but in fact each method still has many restrictions.At first, the degree of depth of substrate can not unscrupulous intensification or is shoaled.Cross its groove depth-to-width ratio of dark substrate and become big relatively, the dimensional accuracy control of ejection formation is difficult for, the disc of shallow excessively substrate made, and its burning mark modulus (modulation) is with too small, and burning quality is not good.On the other hand, because the substrate of disc uses PC to be material mostly, but the solvent resistance of PC is not good, and make and need select the relatively poor alcohols of dissolubility for use, be solvent as tetrafluoropropanol (Tetrafluoropropane).Yet, the azo-compound dyestuff that many metals clamp together is not good for the dissolubility of alcohols solvent, when its solubleness less than 2% the time, to cause dyestuff too poor in the fillibility of groove, make the disc track-seeking signal, (Push-Pull Tracking Signal Amplitude before) is not inconsistent specification requirement as the PPb value, and influences the compatibility of disc, so the too small dyestuff of solubleness is that difficulty can be used on industry.

Known Japanese unexamined nuclear patent announcement NO.112790/1983, NO 114989/1983,85791/1984 and NO.83236/1985 propose a kind of recording medium of using cyanine (Cyanine) dyestuff as dye coating, and this dyestuff has good dissolution characteristics.This dyestuff is because of the good alcohols solvent that uses of its dissolubility, and the fillibility of dyestuff in groove is also preferable.

Yet the anti-optical activity of cyanine dye is poor, when being applied to the disc record layer, often needs to add light stabilizer (quencher), and the technology of being carried as United States Patent (USP) the 5328741st, 5328802 and 5336584 etc. prolongs the life-span of cyanine dye.Though above-mentioned light stabilizer can improve the shortcoming of anti-optical activity difference, but in the application of making disc, light stabilizer has the low shortcoming of dissolubility, separate out crystallization during improper use easily, destroy the writing function of recording layer, and the price of light stabilizer is more a lot of than cyanine dye costliness, causes the raising of cost.

Summary of the invention

For addressing the above problem, a purpose of the present invention is to propose a kind of dyestuff that improves CD tracking signal, be applicable to the dye coating on the optic disc base board, it is characterized in that: wherein this dye coating contains and a kind of tetrafluoropropanol solubleness is less than or equal to 2% dyestuff and accounts for total weight of solids more than 51%, with a kind of to tetrafluoropropanol solubleness more than or equal to 2% the set that cyanine dye constituted.

Of the present invention one is characterised in that contained a kind of tetrafluoropropanol solubleness is less than or equal to 2% dyestuff is the azo-compound that with a metal clamp together of structure shown in (I) to above-mentioned dye coating:

M is a metallic ion; R ₁Be the straight chain shape of carbon number 1 to 6 or alkyl, amido, alkylamino radical or the toluene amido of a chain; R ₂Be the straight chain shape of hydrogen, hydroxy, halogen, ether or carbon number 1 to 6 or the alkyl of a chain; R ₃Be the straight chain shape of hydrogen or carbon number 1 to 6 or the alkyl of branch chain; R ₄Be the straight chain shape of hydrogen, carbon number 1 to 6 or the alkyl or the halogen of branch chain; A ₁For carbon atom and nitrogen-atoms bond form a Hete rocyclic derivatives, comprise;

Substituting group E wherein ₁₀To E ₁₅, E ₁₇To E ₃₈Be selected from hydrogen base, halogen, nitro, cyano group, amido, anilide, hydroxy, carboxyl, alkyl, alkylamino radical, be substituted that base replaces or straight chain shape alkyl, branch chain-like alkyl, naphthenic base, alkoxy, carbon carboxyl, straight chain shape alkenyl, branch chain alkenyl, cycloalkenyl, hydrogen-oxygen alkyl, carbon oxygen base, carbon oxygen carboxylic allyl, alkylthio group, alkane sulphur thiazolinyl, aromatic radical or the heterocyclic radical of unsubstituted carbon number 1 to 15.

The invention has the advantages that this dye coating has good anti-optical activity, it does not need to add light stabilizer again, thus do not have because of the light stabilizer crystallization, and the problem of destruction recording layer writing function, and reduce production costs.

Description of drawings

Fig. 1 only writes record dispensable mould digital audio-video optical record medium structural representation for the present invention.Label declaration

1 optical record medium, 2 substrates

3 dye coatings, 4 reflection horizon

5 cover plates

Embodiment

Cooperate icon that preferred embodiment of the present invention is described in detail.

At first penetrate a plastic material substrate 2 that has formed the about 0.6mm of spiral grooves thickness, the mode with rotary coating is coated with last layer organic dyestuff 3 on substrate 2 again, to write recording use once as disc.Afterwards, plate one deck silver (Ag) with the method for vacuum splashing and plating, as the usefulness 4 in reflection horizon.Then again with the plastic material cover plate 5 thick discs of 1.2mm 1 that form glued together of another sheet 0.6mm; Using the groove gauge of substrate is 0.74 μ m, ditch depth 160nm, and furrow width 410nm, dye solvent are tetrafluoropropanol, solution concentration is 2%.

Experiment one, when using cyanine dye as follows as dye layer material, the PPb value of this disc is 0.119.

Experiment two, when using cyanine dye as follows as dye layer material, the PPb value of this disc is 0.093.

Experiment three, when using cyanine dye as follows as dye layer material, the PPb value of this disc is 0.105.

Experiment four, when using metal as follows to clamp together the azo-compound dyestuff as dye layer material, the PPb value of this disc is 0.747.

Experiment five clamps together the azo-compound dyestuff and is dye layer material when using the used cyanine dye of combined experiments one and testing four used metals, and the weight ratio that cyanine dye and metal clamp together the azo-compound dyestuff is 1: 3 o'clock, and the PPb value of this disc is 0.387.

Experiment six clamps together the azo-compound dyestuff and is dye layer material when using the used cyanine dye of combined experiments two and testing four used metals, and the weight ratio that cyanine dye and metal clamp together the azo-compound dyestuff is 3: 7 o'clock, and the PPb value of this disc is 0.416.

Experiment seven clamps together the azo-compound dyestuff and is dye layer material when using the used cyanine dye of combined experiments three and testing four used metals, and the weight ratio that cyanine dye and metal clamp together the azo-compound dyestuff is 2: 3 o'clock, and the PPb value of this disc is 0.328.

By above-mentioned experiment as can be known, when using above-mentioned cyanine dye as recording layer merely, as the the 1st, the 2nd, the 3rd group of experiment, its PPb value is with too small, and when using above-mentioned metal to clamp together the azo-compound dyestuff merely as the disc dye coating, as the 4th group of experiment, its PPb value all is unfavorable for the rail of seeking of disc player with excessive.So when the mixing of above-mentioned cyanine dye and azo dyes being done proper proportion, as the the 5th, the 6th, the 7th group of experiment, its PPb value i.e. in the DVD specification limit (0.22-0.44).

In addition the the 5th, the 6th, the 7th group of made disc of experiment placed the fast light test machine of high-pressure sodium lamp, after 72 hours, its disc quality does not have marked change yet, shows that it has improved the not good shortcoming of the anti-optical activity of known cyanine dye.

Comprehensively above-mentioned, when knowing that the present invention has industrial applicability, novelty and creativeness, meets the patent of invention important document.Being the above person, only is a preferred embodiment of the present invention, is not to be used for limiting scope of the invention process.Be that the equalization that all the present patent application claims are done changes and modification, be all claim of the present invention and contain.

Claims (7)

1, a kind of dyestuff that improves CD tracking signal, be applicable to the dye coating on the optic disc base board, it is characterized in that: wherein this dye coating contains and a kind of tetrafluoropropanol solubleness is less than or equal to 2% dyestuff and accounts for total weight of solids more than 51%, with a kind of to tetrafluoropropanol solubleness more than or equal to 2% the set that cyanine dye constituted.

2, the described dyestuff that improves CD tracking signal of claim 1 is characterized in that: wherein this CD refers to writable disposable formula Digital video disc DVD-R.

3, the described dyestuff that improves CD tracking signal of claim 1, it is characterized in that: wherein this dye coating comprises the dyestuff of maximum absorption wavelength at 500～650nm.

4, the described dyestuff that improves CD tracking signal of claim 1, it is characterized in that: this optic disc base board more comprises a reflection horizon, it is material that this reflection horizon is selected gold, silver, aluminium or its alloy for use.

5, the described dyestuff that improves CD tracking signal of claim 1 is characterized in that: wherein contained a kind of tetrafluoropropanol solubleness is less than or equal to 2% dyestuff is the azo-compound that with a metal clamp together of structure shown in (I) to this dye coating:

M is a metallic ion; R ₁Be the straight chain shape of carbon number 1 to 6 or alkyl, amido, alkylamino radical or the toluene amido of a chain; R ₂Be the straight chain shape of hydrogen, hydroxy, halogen, ether or carbon number 1 to 6 or the alkyl of a chain; R ₃Be the straight chain shape of hydrogen or carbon number 1 to 6 or the alkyl of branch chain; R ₄Be the straight chain shape of hydrogen, carbon number 1 to 6 or the alkyl or the halogen of branch chain; A ₁For carbon atom and nitrogen-atoms bond form a Hete rocyclic derivatives.

6, the described dyestuff that improves CD tracking signal of claim 5 is characterized in that: the A of structure (I) wherein ₁, for carbon atom and nitrogen-atoms bond form a Hete rocyclic derivatives, comprising:

Substituting group E wherein ₁₀To E ₁₅, E ₁₇To E ₃₈Be selected from hydrogen base, halogen, nitro, cyano group, amido, anilide, hydroxy, carboxyl, alkyl, alkylamino radical, be substituted that base replaces or straight chain shape alkyl, branch chain-like alkyl, naphthenic base, alkoxy, carbon carboxyl, straight chain shape alkenyl, branch chain alkenyl, cycloalkenyl, hydrogen-oxygen alkyl, carbon oxygen base, carbon oxygen carboxylic allyl, alkylthio group, alkane sulphur thiazolinyl, aromatic radical or the heterocyclic radical of unsubstituted carbon number 1 to 15.

7, the described dyestuff that improves CD tracking signal of claim 5 is characterized in that: wherein this dye coating metal ions M of containing the azo-compound that with a metal clamp together of structure shown in (I) is selected from nickel, cobalt or copper.