JPS607630A - Improved molding stamper and manufacture thereof - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a metal stamper for use in replicating optically readable information bearing members. More particularly, the present invention relates to the reproduction of optically readable information bearing members by an injection molding process utilizing a stamper formed of a hardened material that defines an encoded surface.

The improved stamper according to the invention and the method of making such a stamper can be used in connection with the production of plastic information-bearing surfaces of arbitrary shape and having micron-sized discontinuities. However, for ease of understanding, a desk-shaped information holding member is used as an example in the description of the prior art and the present invention. Improvements of the present invention include the properties of the stamper-plastic interface. - In this respect, the inventive concept is broadly applicable to the injection molding of plastic objects carrying information of almost arbitrary shape.

Optically NflTh due to plastic injection molding process
It is well known to reproduce readable information bearing members. In such a process, liquid plastic is injected into a disk-shaped mold and pressurized between an encoded stamper surface and a rigid backing plate. This stamper surface is typically made of nickel and is used for audio, video and/or
Or holds DigiDel information. The liquid plastic is cured, cooled, and then demolded from the encoded nickel surface. The prior art uses nickel as the stumpbar material. The reason is that nickel has the following unique structural properties. The key is that it is sufficiently stiff to withstand fatigue during the molding and molding stages of the injection molding process. Second, electrolytic treatment of large quantities of nickel metal can be carried out very easily.

Third, the cost of kidnapping is relatively low. Fourth, the processing control and parameter ranges are wide. Fifth, it is free from corrosion.

The method for manufacturing stand bars for video desks is patented in US Patent No. 4.
, No. 211,017. This patent is
゛Game, 1\ Published July 8, 1980 in the name of Mr. Nyi and is assigned to the assignee of this invention. Mr. Bander's patent is a multilayer stambar made of copper and nickel. The metal layer is applied by sputter deposition, vapor deposition or deposition from an electroless solution (plating). The encoded photoresist "matrix" surface containing the initially encoded information is first plated with silver using an electroless process. This electroless process is similar to that used to create mirror surfaces. The silver film is deposited to a sufficient thickness to provide electrical conductivity.

This thickness is approximately 0.01 to 2 mils (0.002 to 0.05
close to the lower value of the range (mm). This allows the next electroplating process to be performed. The nickel/copper layer is electroplated to about 3-30 mils (0.076-0.762
It is considered to be the thickness of The last layer is plastic molded and becomes the nickel layer.

If you observe the transmitted light of a replica made of nickel stambar, you will see orange spots r7!1. It seems likely that this will be noticed. This looks like "surface dirt" and is caused by the glow effect (plow) that occurs during the injection molding process.
ing effect) J is due to the surface strain caused by i. Microscopic examination of the discontinuities on the surface of the reproduction shows that the ridges defining the information tracks appear to have been plowed out, or as if they had been cut off by a collision with a sharp object.

Blowing is used in this sense. As a result of various tests on desks made of nickel stumber, this "blowing effect" can be visually confirmed.
A direct correlation was observed between this and desk information playback performance. In this connection, there is a US patent application entitled "Stanno (- and method for injection molding information bearing members)". This Ir\\ patent application is filed under the name of Mr. , which was filed at the same time as the present application and has been assigned to the assignee of the present application.

In this application, a conformal layer formed on the information-retaining surface of the nickel standber (-)
By using chrome as a material and improving the interface between the stand bar and the plastic, desk performance has been greatly improved.

In the present specification, the application by Mr. A. Ng is cited as a reference document showing a technique that improves hardness by improving the interface and has good n[P type retention. Visually and electronically observing a replica made with nickel stamba (-) reveals an ``orange peel'' effect in the otherwise ``dirty'' areas.

The term "orange peel" refers to the shape of the external surface of the information-bearing desk through which the reading light beam must pass before reaching the information-bearing surface. The rough but uniform surface defects resemble those of an orange peel.

The "orange peel" effect causes variations in the refractive index of the desk surface, impairing tracking control.

The reason why the running characteristics of the desk are not sufficient is ``〕.

This is thought to be caused by the interaction between the "low ink" effect and the "orange peel" effect.

Certain defects found in injection molded desks are listed in Stanber's [Waffling J to J2]. This "bookring" effect is observed as a permanent stiffening of the surface due to forming forces exceeding the stiffness of the nickel stamp (-).In fact, traditional nickel stamps (-) are insufficiently strong and physically It is elongated or distorted to form localized areas that are somewhat uniformly distributed. Therefore, it exhibits a Watsuful shape with a shallow chiseling of 1.000 A medar. "Bookring" is made by 15 mil (0,
38 mm) was observed using a nickel stump bar. The improved nickel stambar according to the invention has increased hardness and, of course, in relation to thickness, substantially eliminates the ζ "waffling" effect.

Another problem associated with injection molded video desks is insufficient curing of the plastic material as it moves along the cavity from the entrance to the exit of the mold. When the plastic material is pushed along the cavity,
The cold mold walls cause the material to harden slightly insufficiently. Because of this, a thin outer skin is formed. When this casing is under the same moxibustion condition or flows under the plastic spear (the casing changes its position and fills the cavity, or it flakes off and moves with the molten plastic. The surface becomes rough and the stress points along the part's surface are random and non-uniform.For this reason, the stamper must be encoded with sufficient hardness to retain the shape representing the part's information. The present invention satisfies this need. Additionally, there is a need for improvements in the audio and video properties of optically readable information-bearing members.Such properties can be improved through cleaner demolding at the interface between the master stamper and the stamped material. This has been done by reducing or eliminating the "blowing" and "orange beer" effects of

The present invention substantially solves all the problems of the prior art. For this reason, stampers have been improved to improve signal characteristics and increase the reproduction rate of optically readable information bearing members. This improvement is made by eliminating deleterious surface defects caused by injection molding.

More specifically, the present invention provides methods and means for forming a temperature barrier on a molded surface using a composition as follows. The composition has sufficient hardness to retain the surface integrity and also has low thermal conductivity to minimize or eliminate immature build-up of injected plastic in the mold. .

The material chosen to enforce the temperature barrier has improved lubrication properties over pure nickel. Furthermore, this material has a thermal conductivity of 115 to 100 times lower than that of pure nickel. This causes the injected plastic to fill the cavity before it begins to substantially harden. In addition, this new stamper material improves the r PJ of the stamper.
f# type" characteristics have been improved. This improvement improves signal reproduction quality, reduces defects associated with stampers, and increases stamper yield. This new stamper material is very hard and therefore has a much longer life under the stresses during the injection molding process than pure nickel. As a result, the yield is 2 to 5 times that of a pure nickel stamper.

Briefly, the present invention combines a nickel/nickel phosphide alloy (hereinafter referred to as electroless nickel) that defines the information-retaining surface of the stamper with preferably molybdenum, chromium,
Tungsten, copper, or nickel or the aforementioned Han V
and a backing layer formed from a nickel/copper composite layer of his patent.

In the above-mentioned 7-LA Tong U.S. patent application, smooth,
A hard information-retaining surface is obtained by depositing chromium onto the encoded information-retaining surface of currently used nickel stampers. Nickel stunbar is obtained by depositing thick layers on a photoresist master matrix. However, the present invention differs from the invention of this patent application in the following points. First, the materials chosen for the stamper/mold interface are different. Additionally, the electroless nickel of the present invention is deposited directly onto the photoresist master matrix and provides a hard backing layer. When the synthetic stamper is peeled off from the master matrix, the information-retaining surface that is exposed is made of electroless nickel. In this regard, it is possible to achieve this by attaching chromium to the information-retaining surface of the currently used nickel stump bars;
The less distinct surface discontinuities of the invention appear to provide the advantage of rounding the edges forming the discontinuities, reducing the "blowing" effect of the molded product. It seemed like In the present invention, the information bearing surface of the final stamper is formed directly onto the master matrix, so there is no adhesive layer rounding off sharp edges.

But 11. The running properties of the molded product are improved, the "blowing" effect is reduced, and the mold release properties of the molded product of the stubber are improved. Improvements in various parameters of the forming process include better lubricity, lower thermal conductivity, smoothness, and significantly increased hardness compared to standard nickel stumber. Due to the unique properties of nickel. The exceptional smoothness and thermal conductivity properties of weightless nickel were already achievable using glass or ceramic molds and coatings. By forming the information-retaining surface of the electroless nickel stumpbar, the surface smoothness of the molded product is far superior to that of conventional standard nickel stumpbars. Furthermore, yield is very important when manufacturing optically readable desks. According to the invention,
The yield is improved by a factor of 2 to 5 compared to the conventional method. Therefore, the use of electroless nickel as a temperature barrier in the molding plate of an injection molding machine represents a significant contribution to the art.

According to the present invention, an electroless plated layer of nickel/nickel phosphide is deposited on an encoded photoresist master matrix. Although it is not necessary for the coated surface to be electrically conductive in such an electroless process, the encoded master matrix is soaked in a solution containing palladium or gold salts and applied to the resist at an early stage in the method for depositing the electroless nickel layer. Forms a nuclear layer. Next, layer 7 of this nucleus
/ acts as a catalyst and promotes adhesion. In other words, due to this catalytic action, a layer of electroless nickel is uniformly formed on the entire surface that is freely in contact with the electroless plating solution. In this regard, reference is made to US Pat. No. 2,939.804, which describes a pretreatment for nickel coating of thermoplastic materials. In this patent, a thin discontinuous coating of fully curved copper is first deposited over a thermoplastic material. The copper coating is then immersed in a palladium solution. In this solution, a small amount of radium exchanges with silk. The radium coating is then applied to activate or catalyze the nickel (1 melt γj′y).The method for electroless plating nickel on the metal surface is Knee Ω - Incense A: □')
”V large-y-9 (t-gu 7-ha 2 11 doors-)
Into σ′ plastic V one? Shin 1955, Gu 2.05-2
It is described in 06. Burn II and Brad
Nothing Mr. Ley said↑! j, M'N plating technology is
Includes surface coatings of various base metals such as steel, aluminum, aluminum, steel, and stainless steel. 1\11 >l"Tomobitsu・Ul") -'s use of electroless nickel removal creates relatively non-porous coatings on basic materials.
This is to form a protective layer. This is done for protection in corrosive environments and to give a hard surface to the material.
-41' nature is considered.

In other words, in addition to increasing the hardness + cr of pure nickel,
11 properties such as P'4 lubricity, smoothness, and thermal conductivity are taken into consideration. By using an electroless nickel layer, the thickness of the electroless nickel layer as well as the loss of nickel and phosphorus in the deposited layer can be controlled, and the electrical For example, we have solved various problems associated with video desk duplexes.Surface defects and signal degradation are easily observable in this field, and the exact cause of such defects is unknown. , it is not possible to create a theoretical model.In other words, it is difficult to determine which physical characteristics affect which defects, and which parameters should be adjusted to reduce each defect. , is not known. Furthermore, the difficulty of the analytical process is further increased by the mutual influence when varying one physical property with respect to another physical time tI.

The present invention is not intended as a retention color coating for base metals;
as the active surface on which the thermoplastic information-bearing member is molded;
It involves the novel use of electroless first-coat nickel/nickel phosphide. By controlling the stanno(-formation process), an optimal phosphorus content of the electroless nickel layer, its optimal thickness, and its thickness can be obtained, resulting in an extremely hard, smooth, and lubricating layer. Because of the good surface it provides and its thermal conductivity, it enters the mold and overwhelms the mold walls].

Immature lamination of the plastic side slope is prevented.

As previously mentioned, one of the problems with molding thermoplastic materials into thin disk shapes is the insufficient cooling of the relatively hot liquid plastic. And this is due to the relatively cold walls of the mold. As the plastic material enters the mold cavity, cooling by the mold walls forms a film at the plastic-mold interface.

This interface replicates the surface of the encoded stamper representing one of the walls of the mold cavity.

Once the film is formed, the continuous movement of the body of liquid plastic beneath the film causes cracks to develop in the film layer. A portion of the film is thereby selected as a cooled plastic flake. As a result, the surface of the finished desk product is distorted, and the reproduction signal when the molded desk is used is also distorted.

This problem, of course, is due to the fact that the stamper's informational surface is replicated onto the corresponding surface of the desk and cooled so that the plastic peels intact from the mold. One solution to this problem is the controlled circulation of cooling and heating fluids around the mold walls. However, this is disadvantageous when mass production is carried out. Because of the need to withstand injection molding pressures, the walls of the mold cavity are very thick and difficult to cool and heat in a short period of time. This limits production efficiency. Furthermore, even if
Even if the adjacent wall of the mold to the stamper backing cools and heats rapidly, one of the surfaces of the mold cavity will
15 mils to 40 mils (Q, 381 to 1.016m+n)
The stamper must be of a certain thickness. For this reason,
In particular, it takes a long time for the temperature of the stamper itself, which is in contact with the molten plastic, to stabilize.

The present invention is based on the following premises. That is, the temperature barrier between the mold wall and the molten plastic helps improve the temperature characteristics of the walls within the cavity. This temperature barrier then forces a good replica, ie, a desk with a good shape and surface that accurately replicates the shape of the stamper, free of "orange beer""blowing" or "watzfling" effects. The use of non-metallic materials in the stamper reliably prevents the formation of a premature thin layer of plastic material as it passes through the mold cavity at a thermally conductive pressure of 7 degrees. Because the heat transfer is very slow, the molten plastic requires a very long time to harden.In addition, it can be used to form stampers for injection molding of thermoplastic desks.Known non-metallic surfaces As a characteristic, they are very soft and/or brittle and are easily damaged and/or broken by the pressure of injection molding.

The present invention uses electroless nickel to solve this problem. This electroless nickel has temperature characteristics like a semimetal compound, and also has the strength of an E metal.

Electroless nickel microstructures are characterized by being deposited on the base metal surface as a number of parallel, well-bonded stacks. Within each thin layer are columnar structures perpendicular to the base metal surface. Due to this fine groove structure, the thermal conductivity of electroless nickel is 115 to 1/10 that of pure nickel and even pure gold 1i.

In the above-mentioned application, the stamper surface is made of chromium, which improves the hardness compared to the industrial standard non-pure nickel stamper. However, once deposited, electroless nickel is harder than pure nickel, approaches the hardness of chromium when hardened in a subsequent heating step, has favorable heat transfer properties, and has lubricating properties not found in chromium. That is, wax or S is applied to the surface of the stamper.
Injection molding processes that require molding agents can be avoided by using electroless nickel. The reason is that electroless nickel has inherent lubricating properties.

Traditionally, the nostamping process begins with a 0.64 cm disc-shaped glass plate that is provided with a thin layer of photoresist. The layer of photoresist is then selectively exposed to a laser beam to write the 17i information.

After development, information in the form of tiny pits appears in this layer. A thin film with a thickness of several amps is vacuum deposited on the recording surface. Further nickel is then electrolytically deposited on the vacuum-deposited nickel layer. This film thickness is sufficient to withstand the pressure during the injection molding process, typically 15 mils (0.38 mm)
1mm) or more.

The glass plate is coated with 1G of nickel to expose the encoded nickel surface. The nickel surface has a track of microridges approximately 0.6 microns wide and approximately 0.6 to 2 microns high above the planar base surface. This is illustrated in the enlarged view of FIG. The desk 2 has a planar base surface 4. From the planar base surface 4 is a series of ridges 6 forming a circular track.
is sticking out. The improvement of the present invention is that the base layer 18 is thinner.
The process consists in the formation of an electroless nickel information holding layer 16 supported by . FIG. 2 shows a partial cross-section, in which a glass substrate 8 is provided with a thin layer 10 of photoresist adhered to a highly polished top surface 9. FIG.

After being exposed to a modulated light beam and developed, the glass substrate 8 carries a series of photoresist protrusions 12 protruding from the planar surface 14.

This is shown in FIG. 3 and is hereinafter referred to as the master matrix.

A stamper having an encoding surface complementary to the master matrix is formed from this master matrix.

To catalyze the information-bearing surface of the master matrix, the master matrix is immersed in a solution containing copper salts to obtain a thin discontinuous copper layer on the matrix surface. The copper in the solution is reduced to a metallic state and plated the immersed master matrix. For preliminary steps in this process, see US Pat. No. 2,939,804. After the copper coating has been fully applied to the master matrix, soak it in a solution containing palladium or gold salts. As a result, some of the copper coating becomes oxidized and dissolves into the solution, while some of the palladium or metal salt is reduced to its metallic state and binds to the copper coating. This purpose is about 100
filled using ppm palladium chloride solution.

The master matrix was treated with palladium, resulting in a mixed coating of copper and palladium, which is preparation for the nickel coating process.

The catalyst coated master matrix is then rinsed with cleaned, de1ionized and microfiltered water. Further, the master matrix is placed in an electroless plating bath containing water, acid, a mild reducing agent, and a nickel pot. Preferably, the master matrix is placed in a circulation bath, rotated, and then placed in an electroless plating bath.
Aim for an even ratio of plating action.

The prescription for the electroless plating tank is listed below.

Nickel chloride 4, oz/gal (30! i'/L) NiCI2.
6F Otori 20 Sodium hypophosphite, Udo 1.3 oz/gal (105'/A) NiH2PO
2, I20 Sodium citrate 1.8oy, /gal C14! :'//-),? VI
rL, C6H5015~L/2 ■I20 fluoroboric acid IIBF+, (50q!j) (4F/1) PII 4
．． 0-5.5 Temperature 194"F (90C) Deposition Rate Approximately 0.2 mils (0,005*m)/hr Master matrix 8 with a layer 16 of electrolessly deposited nickel/nickel phosphide to a thickness 14 Go to show.

The copper/palladium or copper/gold layer [? , I not shown.

The reason is that the force λ et al. is very thin compared to the other layers shown.

The thermal conductivity of the stanbar surface and the temperature gradient of methane, knee 1, are important physical properties. First, the advantages of using electroless nickel as a methane material depend on these properties. The applied force; the ratio of nickel to phosphorus, the temperature/time relationship of the plating process, and the thickness of the electroless nickel tack layer can all be varied. Adjust these to obtain the desired value for a given mold and a given thermoplastic month 1. 17. Some of the temperature and pressure characteristics associated with the injection molding process can be considered.

Typically, 1 part electroless nickel is used, and 4 to 10 parts phosphorous is used in the form of nickel phosphide. This coating can also be coated with a commercially available General American Transplantation Corporation [Kanigen]
．． 0005 on (0,0002 inches) can be deposited at a speed of 7 o'clock. Due to the slow deposition rate of electroless nickel plating, it is neither economical nor practical to form the full thickness of a nickel phosphide stamper.

Therefore, a matrix having a relatively thin but sufficient thickness of electroless nickel phosphide deposited by electroless plating is subjected to standard galvanic processing. This process is
This is to form the backing to be an electroless nickel layer with a softer and/or more convenient and economical electroplated gold support. The electroplating metal can be selected from the group of chromium, nickel, molybdenum, iron, tungsten.

A plated plate in this manner is shown in FIG. As shown, the electroless nickel layer is covered with a relatively thick backing layer 1B of electroplated gold. Nickel 711. A comprehensive explanation of awareness can be found in publication 19 of the above-mentioned book by Burns Tokihisa Brad.
It is described on pages 1-205.

Electroless nickel can be electrolessly deposited to any thickness. However, it is usual to plate the stamper to a total thickness of 0.5 to 10 mils (0.0127 to 0.254 mm) in actual practice. As already mentioned, due to the inherent properties of the deposits, large-width deposits are unnecessary. The electrodeposited backing material fSllB has a synthetic stamper of 15~
It can be added to a thickness of about 40 mils (0.381 to 1.016 questions). In some applications, for electroless nickel thicknesses on the order of 5 mils (0.127 mm) or more, the deposition of non-metallic backing materials is also contemplated.

Depending on the product being formed and the desired temperature characteristics of the stamper, the electroless nickel layer may be between 0.5 and 10 mils (0.5 to 10 mils).
It can be colored to a thickness in the range of 0.0127 to 0.254 rqm). Alternatively, the electrodeposited gold phase backing layer can be 5 to 40 mils (0.127 to 1.016 wn side thick).As an extreme example, only the encoded layer of the stamper can be approximately 1 micron thick. Electrolytic nickel plating provides the advantage of a sufficiently thick layer, and approximately 15
It is thought that it can be attached in minutes. The minimum recommended thickness of the electroless nickel layer is 0.5 mil (0.0127 mm).
It is.

As an example, for a preferred stamper with the minimum recommended thickness of electroless nickel, the electroless nickel thickness l-
10,5 mil (0,0127 mII+)
Q) The plating is applied to the thickness of . The maximum required thickness of the electroless nickel layer is V'2.35 mil (0,E38
5 mil (0.12 mm) molybdenum thickness
An electroless nickel layer of 7 mm) is preferred.

It is also preferable to deposit a hard nickel or molybdenum layer by chemical vapor deposition.For example, deposition of relatively hard molybdenum can be achieved by chemical vapor deposition of dicarbonyl onto molybdenum. It is possible to form a stamper with a total thickness on the order of 30 mils (0,762 strips) in a time that is much smaller than the speed at which the master matrix is deposited. CTlk VC, the encoded surface of the nickel/nickel phosphide layer can be hardened by heat treatment. In this regard, the deposition is with 4-10% phosphorus and the balance nickel, and when deposited is amorphous*t
It will be rebuilt. Upon heat treatment, nickel phosphide forms a nickel lattice structure, precipitates and hardens.

This hardness is determined by the degree of crystallization, and its maximum value is obtained at a temperature of about 400°C. 400℃ for a longer period
Co-precipitation of nickel phosphide and nickel crystals occurs by placing it under a higher temperature. This improves malleability, but hardness becomes a problem. Actually, the fragile electroless nickel under the monitor razor blade 1 is 370 ~
It becomes malleable by heating in the range of 510°C for 1 hour. After such heat treatment, the hardness is 480 in the case of plating, V P
Improved from H to 850VPI (but 480V
The pH value is higher than that of most electroadhesives.

In the above, an improved stamper for use in injection molding has been described. The use of non-11'T, nickel as an encoded information-bearing layer for the stamper provides the following improvements. First, hardness is improved. This makes pure nickel skumber 2 and 1
The lifespan will be ~5 times longer. Yes, the "Wazfling effect" has been eliminated. The tl of the molded product has been improved. As a result, the "orange beer" and "blowing" effects are eliminated. Low thermal conductivity. This solved the premature curing of the molten plastic when it filled the mold cavity. Adds natural lubricity to the adhesion on the nickel layer. In this respect, lubricants tend to be different from ROMs.

Although the present invention has been described in terms of preferred embodiments, various modifications and changes can be made within the scope of the invention.

[Brief explanation of the drawing]

FIG. 281 is a partially enlarged view of an information bearing surface forming an optically readable information bearing desk. FIG. 2 is a partial cross-sectional view showing the support to which the photoresist has been deposited before the photoresist layer is applied. FIG. 3 is a partial cross-sectional view of the attachment support of FIG. 2 after development of the photoresist layer. FIG. 4 shows an initial electroless plated layer of nickel/nickel phosphide on the developed photoresist surface of the support of FIG. FIG. 5 shows that a backing material is applied onto the non-containing nickel layer by I-deposition, and FIG. 6 shows the electroless nickel/backing layer composite stamper after it has been peeled off from the support. Explanation of symbols

Claims (1)

[Claims] 1) A method of manufacturing an improved stamper capable of forming an optically readable information-bearing member, comprising: applying a master information-bearing surface to a support that retains information in a discontinuous manner on the surface; a step of forming an electroless nickel coating on all information-retaining surfaces of the support in a nickel plating tank containing sodium hypophosphite, and adjusting the amount of sodium hypophosphite in the plating tank. The coating has a predetermined thermal conductivity, that is, 0.0060-0.0080 Cal/
applying a backing material to the coating to form a synthetic meta/par having an information-bearing surface complementary to that of the support; A method for manufacturing a stamper comprising the step of removing the formed synthetic stamper. 2) The plating step removes the electroless nickel coating by 0.5 to 1.
The deposition step includes electroless plating the backing metal layer to a thickness of about 5 to 40 mils (0.127 to 1.016 mm). A method according to claim 1, characterized in that the method comprises electrodepositing on a. 3) The metals electrodeposited above are chromium and nickel. The method according to claim 1), characterized in that the material is selected from molybdenum, iron and tungsten. 4) the information bearing surface comprises a photoresist)/Q, the support is formed of glass, the discontinuities in the surface are micron-sized bits in the photoresist layer, and the method The step of catalyzing the surface of the photoresist layer by depositing a relatively thin layer of a core of a metal selected from the group consisting of palladium and gold acts as a catalyst for the step of catalyzing the photoresist layer. The method according to claim 1), further comprising, before each deplating stage r1. 5) The method of claim 1, wherein the step of depositing comprises chemical vapor deposition of molybdenylcarbonyl onto an electroless nickel coating. 6) The above electroless nickel is in the form of a nickel phosphorus compound.
The method according to claim 1), characterized in that it contains phosphorus in the range -8% by weight. 7) Heat the stamper at a temperature of about 400℃ or less.
°Rock hardness C,! =70°Rockwell hardness C
A method according to claim 1, further comprising, after the separating step, the step of curing the coating to a hardness between . 8) The plating step includes electrolessly plating the fracture to a thickness of 1 to 8 microns, and the deposition step includes depositing a backing metal layer of about 5 to 40 mils (0.4/27 to
1. The method according to claim 1), characterized in that the method comprises electrodeposition to a thickness of 6 mm); 9) Improvements capable of forming an optically readable information holding member. A method for manufacturing a stamper comprising the steps of forming a master information-retaining surface on a support that retains information in a discontinuous manner on the surface, and nickel-plating an electroless nickel coating on all information-retaining surfaces of the support. applying a backing material to the coating to form a synthetic stamper having an information-retaining surface complementary to that of the support; The thickness of the above backing material is adjusted to tt'J, and a synthetic stambar is made.
115 to 1/10 of the heat transfer ratio of nickel with the same thickness as
A method for manufacturing a stamper comprising the steps of: forming a stamper having a predetermined heat transfer ratio on an information-retaining surface of a coating of 0.0 and removing the synthetic stamper formed from the support. 0 10) A stamper capable of forming an optically readable information retaining member includes a relatively thin electroless nickel having an information retaining surface on its surface, and the electroless nickel having a predetermined thermal conductivity. 0.0060 = 0.0080C
a 1 /crrv' see / "F, and is characterized by having a relatively thin bonding layer bonded to the non-information retaining surface of the electroless nickel at a molecular level. 11) The electroless nickel layer has a thickness of 0.5 to 10 mil (0,
0.127 to 0.254 m);
Stanno (-012) according to claim 10), which is a metal layer having a q value of 6).
The above gold JR hachrome, nickel, morphan. 13) The information retaining surface of the electroless nickel layer is selected from iron and tungsten. Claim 10) The above-mentioned electroless nickel stamper is characterized in that it has a core layer of gold selected from the group of
, containing 4-8% by weight of phosphorus in the form of a nickel-phosphorous compound (claim 1)
15) The hardness of the electroless nickel layer is between 40'-rotural hardness C and 70'-rotural hardness C. (Stamper-6 according to C 16) The plated electroless plating layer has a thickness of 1 to 8 microns, and the backing layer has a thickness of about 5 to 40 mils (0,
17) An optically readable information holding member can be formed. The stamper includes a relatively thin electroless nickel having an information-retaining surface on its side, and a relatively thin backing layer bonded to the non-information-retaining surface of the electroless nickel at a molecular level, The thicknesses of the layer and the backing layer are relative and sufficient to have a predetermined heat transfer ratio on the information-retaining surface of the target, which is 115 to 1/100 of the heat transfer ratio of nickel having the same thickness as the synthetic stamper. Buttoned J
018) A method for producing an improved stun plate capable of forming an optically readable information-retaining portion side, which retains information in a discontinuous manner on its surface. a step of forming a master information holding surface on the support; a step of forming an electroless nickel coating on all information holding surfaces of the support in a plating bath; and a step of removing the synthetic stand bar formed from the support. and about 40
Heating the stamper at a temperature of 0°C or less,
A method for producing a stamper, comprising the step of hardening the stamper to a hardness between 40° and 70' rotary hardness C. 19) The above plating step is an electroless nickel coating of 5 to 40
Available in thicknesses ranging from 0.127 to 1.016 mils
19. A method according to claim 18, characterized in that it comprises MX and deplating. 20) the information-bearing surface comprises a photoresist layer, the support is formed of glass, the discontinuities in the surface are micron-sized bits in the photoresist layer, and the method catalyzing the surface of the photoresist layer by depositing a relatively thin layer of gold-containing nuclei selected from the group consisting of palladium and gold to act as a catalyst, prior to the electroless plating step; 19. The method of claim 18, further comprising: 21) A stamper capable of forming an optically readable l'ff information holding part A' is provided with electroless nickel having an information holding surface on its - side, and the electroless nickel is
Claim 1) having a thickness in the range of 40 mils (0.127 to 1.0 mm).
22) A method for manufacturing an improved stamper capable of forming an optically readable information-bearing member, wherein a master information-bearing surface is provided on a support that retains information in a discontinuous manner on the surface. a step of forming an electroless nickel coating (σ) on all information-retaining surfaces of the support in a plating bath;
removing a synthetic stamper formed from the support; and applying a backing material to the coating to form a synthetic stamper having an information-retaining surface complementary to the information-retaining surface of the support. and removing the synthetic stamper formed from the support, further heating the stamper at a temperature of about 400° C. or less, and removing the synthetic stamper formed from the support.
A method for producing a stamper comprising the step of hardening the stamper to a hardness between 40° Rockwell hardness 11C and 0° Rockwell hardness C. 23) In a stamper capable of forming an optically readable information holding member, a comparatively thin electroless nickel having an information holding surface on its - side, and a 40 mm
°Rockwell? A patent characterized in that the invention has a hardness between ZiC and 70° rock hardness C, and further comprises a relatively thin backing layer bonded to the non-information retaining surface of the electroless nickel at a molecular level. Stamper 0 according to claim 1)