WO2004078446A1 - ディスク基板成形用金型およびディスク基板の製造方法 - Google Patents
ディスク基板成形用金型およびディスク基板の製造方法 Download PDFInfo
- Publication number
- WO2004078446A1 WO2004078446A1 PCT/JP2004/002183 JP2004002183W WO2004078446A1 WO 2004078446 A1 WO2004078446 A1 WO 2004078446A1 JP 2004002183 W JP2004002183 W JP 2004002183W WO 2004078446 A1 WO2004078446 A1 WO 2004078446A1
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- WO
- WIPO (PCT)
- Prior art keywords
- disk substrate
- thermal conductive
- low thermal
- mold
- conductive element
- Prior art date
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Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/26—Apparatus or processes specially adapted for the manufacture of record carriers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D17/00—Producing carriers of records containing fine grooves or impressions, e.g. disc records for needle playback, cylinder records; Producing record discs from master stencils
- B29D17/005—Producing optically read record carriers, e.g. optical discs
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
- B29C45/263—Moulds with mould wall parts provided with fine grooves or impressions, e.g. for record discs
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
- B29C45/263—Moulds with mould wall parts provided with fine grooves or impressions, e.g. for record discs
- B29C45/2632—Stampers; Mountings thereof
- B29C2045/2634—Stampers; Mountings thereof mounting layers between stamper and mould or on the rear surface of the stamper
- B29C2045/2636—Stampers; Mountings thereof mounting layers between stamper and mould or on the rear surface of the stamper insulating layers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
- B29C45/263—Moulds with mould wall parts provided with fine grooves or impressions, e.g. for record discs
- B29C2045/2648—Outer peripheral ring constructions
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/38—Moulds or cores; Details thereof or accessories therefor characterised by the material or the manufacturing process
- B29C33/3828—Moulds made of at least two different materials having different thermal conductivities
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2017/00—Carriers for sound or information
- B29L2017/001—Carriers of records containing fine grooves or impressions, e.g. disc records for needle playback, cylinder records
- B29L2017/003—Records or discs
- B29L2017/005—CD''s, DVD''s
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S425/00—Plastic article or earthenware shaping or treating: apparatus
- Y10S425/81—Sound record
Definitions
- the present invention relates to a disk substrate molding die for molding a disk substrate and a method of manufacturing a disk substrate.
- Disk-shaped substrates such as an optical disk substrate and a magneto-optical disk substrate are manufactured from the viewpoint of productivity by filling a molten resin in a cavity provided in a mold. Small irregular pits and grooves are formed on a stamper made of nickel or the like mounted in a mold. After the molten thermoplastic resin comes into contact with the stamper, the fine irregular pits and grooves on the stamper are transferred to the thermoplastic resin, and then the molten thermoplastic resin is solidified to obtain the desired optical disc substrate. (For example, see Patent Document 1).
- Patent Literature 1 a fixed-side mirror plate and a movable-side mirror plate whose temperature is adjusted are disposed above and below the cavity, respectively.
- the stamper is mounted on the movable mirror, and the inside of the stamper is fixed by the stamper holder and the outside of the stamper is fixed by the outer ring.
- the temperature of the stamper In order to transfer the pits and grooves on the optical disk substrate, the temperature of the stamper must be higher than the thermal deformation temperature of the thermoplastic resin. Since it is necessary to further increase the maximum temperature of the stamper in order to enhance the fluidity of the thermoplastic resin, it is necessary to further increase the temperature of the heat transfer medium for adjusting the mold temperature.
- Low heat conductive materials are mainly used for heat-resistant plastics such as polyimide and ceramics.
- Patent Literature 2 discloses aluminum and copper
- Patent Literature 5 discloses bismuth as a low heat conductive material of metal.
- the fixed-side stamper and the movable-side stamper have an annealing plate.
- the inner sides of the fixed side stamper and the movable side stamper are held by an inner peripheral holder, and the outer sides of the fixed side stamper and the movable side stamper are held by an outer peripheral ring. That is, the outer surface of the annealing plate is protected by the outer ring.
- the movable-side stamper is dimensioned to be larger than the fixed-side stamper, the movable-side outer peripheral ring is located outside the fixed-side outer peripheral ring. Therefore, the fixed-side outer peripheral ring holds the fixed-side stamper and is in contact with the outer peripheral portion of the movable-side stamper.
- the fixed-side outer peripheral ring has a structure sandwiched between the fixed-side stamper and the movable-side stamper.
- the fixed outer peripheral ring defines an outer peripheral side surface of the optical disk substrate.
- the movable mold is configured to slide while fitting into the concave portion of the fixed mold.
- the movable mold and the fixed mold each have insulation.
- the outer peripheral side surface of the heat insulating material attached to the movable mold slides while fitting into the concave part of the fixed mold with the inner peripheral surface.
- Another problem is that the heat insulating material is peeled off from the outer peripheral side.
- a heat insulating layer and a metal layer made of a heat-resistant polymer extend from the cavity face to the side face of the base mold.
- the heat-insulating layer and the metal layer provided on the side surface of the base mold are in contact with the opposing fixed-side mounting plate and constitute a split surface that is split into two. Therefore, the heat insulating layer and the metal layer provided on the side surface of the base mold do not act as sliding parts during the molding operation.
- plastic materials, ceramic materials, and metal materials have been used as low thermal conductive materials.
- such low thermal conductive materials have the following problems. That is, plastic materials are generally inferior in Oka U property and surface strength. Ceramic materials are generally brittle and have low impact resistance.
- Patent Literature 2 Aluminum and copper (metallic materials) disclosed in Patent Literature 2 do not act as low thermal conductive materials because they have higher thermal conductivity than stainless steel as a base mold material.
- bismuth disclosed in Patent Document 5 is brittle and has low hardness, and thus has poor mechanical properties.
- the present invention has been made in view of the above-described problems, and it is an object of the present invention to prevent the separation of a low heat conduction element and the occurrence of burrs on the outer periphery, and to form a fine uneven pit or groove up to the outer periphery of the disk substrate. It is an object of the present invention to provide a method for manufacturing a metal mold and a disk substrate.
- a second metal mold opposite to the first metal mold is A second metal mold opposite to the first metal mold
- a ring-shaped regulating member that fits in sliding contact with either one of the first low heat conduction element or the second low heat conduction element
- a method of manufacturing a disk substrate of the present invention is characterized in that a disk substrate is manufactured using the above-described die for forming a disk substrate.
- the cavity defined by the stamper, the second low heat conduction element, and the ring-shaped regulating member can be reduced. Since there is no gap in the fitting portion, the occurrence of paris on the outer peripheral side surface of the disk substrate is suppressed. Further, since the outer peripheral portion of the disk substrate is flat, minute uneven pits and grooves are formed up to the outer peripheral portion as much as possible. Furthermore, since the non-engagement end of the low thermal conductive element is not located at the fitting portion between the low thermal conductive material and the ring-shaped regulating member, peeling of the low thermal conductive material from the base mold is prevented.
- FIG. 1 is a schematic sectional view of a mold used in the first embodiment of the present invention
- FIG. 2 is an outer peripheral portion (X) of the mold used in the first embodiment of the present invention
- Fig. 3 is an enlarged cross-sectional view of Fig. 3 and Fig.
- FIG. 3 shows the amount of decrease in the temperature of the heat medium, which adjusts the mold temperature at which the transfer to the optical disk substrate is constant, based on the case where the low thermal conductive material is not provided.
- FIG. 4 is a diagram for explaining the relationship between the thermal conductivity of the low thermal conductive material and FIG. 4 is a diagram for explaining the relationship between Vickers hardness and Young's modulus of a metal element alone, and FIG. FIG. 6 is an enlarged sectional view of an outer peripheral portion of a mold used in a second embodiment;
- FIG. 6 is a schematic sectional view of a mold used in a third embodiment of the present invention; The figure shows an enlarged cross section of the outer peripheral part of the mold used in the third embodiment of the present invention.
- the FIG. 8 is an enlarged sectional view of a peripheral portion of the mold which need use in the fourth embodiment of the present invention.
- FIG. 1 is a sectional view of a main part of a disk substrate molding die according to a first embodiment of the present invention.
- the molding die includes a fixed die 1 and a movable die 2.
- the fixed mold 1 When viewed from the cavity 20 side, the fixed mold 1 includes a stamper 6, a low heat conductive material 7 as a first low heat conductive element 7, a fixed side mirror surface plate 8 as a first base mold, and a fixed side base 4 It has a laminated structure in order.
- a spool push 3 for injecting the molten resin into the cavity 20.
- a stamper holder 15 is provided outside the sprue push 3, outside the sprue push 3, a stamper holder 15 is provided.
- the inner peripheral portion of the stamper 6 and the low thermal conductive material 7 is integrally fixed to the fixed-side mirror panel 8 by the stamper honoredder 5.
- the fixed-side base plate 4 and the fixed-side mirror plate 8 are fixed with Porto.
- the outer peripheral portions of the stamper 6 and the low heat conductive material 7 are evacuated from the suction passage A provided in the fixed base 4 and the fixed mirror panel 8. Is fixed to the fixed-side mirror panel 8 by suction.
- a fixed-side butting ring 9 is provided on the outermost side of the fixed-side mirror panel 8, and the fixed-side butting ring 9 is fixed to the fixed-side base 4.
- the movable mold 2 is composed of a low thermal conductive material 15 as a second low thermal conductive element, a movable mirror panel 16 as a second mold, and a movable base 13 in this order. It has a laminated structure.
- An ejector pin 10, a power punch 11, and an ejector sleep 12 are provided at the center of the movable mold 2.
- the ejector pins 10 and the ejector sleeves 12 are configured to project when the injection-molded optical disk substrate is taken out of the mold.
- the cut punch 11 is for forming an inner hole in the formed optical disc substrate. Outside the ejector sleep 12, a low thermal conductive material holder 14 is provided.
- the inner peripheral portion of the low thermal conductive material 15 is fixed to the movable mirror panel 16 by the low thermal conductive material holder 14.
- the outer peripheral portion and the side face of the low heat conductive material 15 are moved relative to the movable mirror board 16. Fixed.
- FIG. 2 is an enlarged view of a portion X in FIG.
- the low thermal conductive material 15 covers the upper surface and the outer peripheral side surface of the movable mirror panel 16.
- the non-engagement end 21 of the outer peripheral side surface 29 of the low thermal conductive material 15 extends to just before the movable base 13.
- a passage is provided for flowing a heat medium such as water for adjusting the mold temperature of the fixed mold 1 and the movable mold 2.
- a heat medium such as water for adjusting the mold temperature of the fixed mold 1 and the movable mold 2.
- an outer peripheral ring 17 that defines the outer peripheral side surface of the optical disc substrate is configured to fit with the low thermal conductive material 15.
- the outer peripheral ring 17 is urged in the direction of the fixed mold 1 by a compression panel 22.
- an annular groove 23 is formed along the non-engaging end 21 which is the lowermost end of the outer peripheral side surface 29 of the low thermal conductive material 15. Due to this annular groove 23, even if the non-engaging end 21 of the low thermal conductive material 15 extends to just before the movable base 13, the low thermal conductivity The thermal expansion of the conductive material 15 prevents the movable base 13 from contacting. Therefore, the low thermal conductive material 15 is prevented from peeling off from the movable mirror panel 16.
- a movable-side butting ring 18 is provided further outside the outer peripheral ring 17.
- the compression panel 22 of the outer peripheral ring 17 and the movable-side abutment ring 18 are both fixed to the movable-side base 13. Therefore, when the movable mold 2 moves in the vertical direction, the outer peripheral ring 17 and the movable side butting ring 18 move together with the movable side base 13.
- the movable side butting ring 18 abuts against the fixed side butting ring 9 when the fixed mold 1 and the movable mold 2 are closed, and defines the height of the cavity 20, that is, the thickness of the optical disk substrate. ing.
- the inner peripheral side surface 27 of the annular outer ring 17 is in sliding contact with the outer peripheral side surface 29 of the low thermal conductive material 15.
- the inner peripheral side surface 27 of the outer peripheral ring 17 and the outer peripheral side surface 29 of the low thermal conductive material 15 are in sliding contact with each other at a sliding contact surface 24.
- the lower end 26 of the outer ring 17 is below the molding surface 28 which is the uppermost surface of the low heat conductive material 15, and the lower end 26 of the outer ring 17 is The engagement is performed in a state of being located above the non-engaging end 21 which is the lower end. That is, the lower end of the outer peripheral ring 17 is located within the range of the outer peripheral side surface 29 of the low thermal conductive material 15 that is in sliding contact.
- the outer peripheral ring 17 slightly slides in the vertical direction along the outer peripheral side surface 29 of the low thermal conductive material 15, but does not deviate from the outer peripheral side surface 29 of the low thermal conductive material 15.
- the fixed-side mirror panel 8 and the movable-side mirror panel 16 are made of stainless steel.
- the thermal conductivity of the fixed-side mirror panel 8 and the movable-side mirror panel 16 is approximately 25 W / m ⁇ K.
- the fixed thermal mirror 8 and the movable Experiments were conducted on the case where the mirror surface board 16 was thickened.
- injection molding was performed using a stamper with a pit density of 40 G bin 2 under the same heating medium temperature for adjusting the mold temperature of the fixed mold 1 and the movable mold 2, and sufficient transferability was obtained.
- the required heating medium temperature was determined.
- the stamper is made of nickel and has a thermal conductivity of 9 OW / m ⁇ K.
- the thermoplastic resin is a polycarbonate resin, and the molding cycle is 10 seconds.
- the stamper surface and mirror surface before and after the start of molding was measured, and the thermal conductivity between the members was determined. Based on these data, based on the case where the low heat conductive plate 7 and the low heat conductive material 15 were not provided, the heat medium temperature at which the maximum attainable temperature of the stamper was the same was determined.
- Figure 3 shows the results.
- the low heat conductive plate 7 and low heat conductive plate 7 and the low heat conductive material 15 This is the case where the thermal conductivity of the conductive material 15 is 15 W / m ⁇ K or less. Therefore, the thermal conductivity of the low thermal conductive material 15 needs to be 15 W./m ⁇ K or less.
- the low thermal conductive material made of pure metal only needs to have a Young's modulus of 100 GPa or more and a Vickers hardness of 50 or more.
- the relationship between Vickers hardness and Young's modulus in pure metals other than stainless steel is as shown in Fig. 4. From FIG. 4, it can be understood that the higher the Young's modulus, the higher the Vickers hardness. If the Young's modulus is 10 OGPa or more, the Vickers hardness is 50 or more. Therefore, it is sufficient that the low thermal conductive material 15 has a Young's modulus of 10 OGPa or more.
- the Young's modulus of the alloy is close to that of the pure metal as the main component, and the surface hardness of the alloy is harder than that of the pure metal.
- a titanium alloy containing titanium as a main component had a thermal conductivity of 7 to 8 WZm ⁇ K.
- the; 3 alloy and the) 3 alloy had Young's modulus of 100 to 130 GPa and Vickers hardness as surface hardness of 240 or more. Therefore, the Vickers hardness of the titanium alloy is equal to or higher than that of the stainless steel constituting the die body, indicating that it is sufficiently hard.
- the fixed mold 1 and the movable mold 2 are positioned by fitting the fixed-side butting ring 9 and the movable-side butting ring 18. That is, positioning in the center direction is performed by the tapered portion provided on the fixed-side butting ring 9 and the movable-side butting ring 18, and positioning in the thickness direction is performed by the flat portion.
- the outer ring 17 has a structure in which abrasion due to sliding with respect to the low thermal conductive material 15 is suppressed. The harder the materials are, the more the wear is suppressed.
- the outer peripheral ring 17 is made of stainless steel like other mold members, if the hardness of the low thermal conductive material 15 is 100 or more in Vickers hardness, there is no practical problem. confirmed. Therefore, the low thermal conductive material 15 preferably has a Pickers hardness of 100 or more.
- the outer ring 17 may be made of the same material as the low thermal conductive plate 7 and the low thermal conductive material 15.
- the low thermal conductive plate 7 and the low thermal conductive material 15 as low thermal conductive materials are manufactured using Ti-6A1-4V which is AMS (aerospace material standard) 4911. This material contains 5.50 to 6.75 wt% aluminum and 3.50 to 4.50 w%. It contains t% vanadium, and the rest is an alloy material called titanium. The Young's modulus of this material is 113 GPa. The thickness is 2 mm.
- Injection molding was performed using a stamper with a pit density of 4 OG bit / in 2 under the condition that the mold temperature of the fixed mold 1 and the movable mold 2, in other words, the temperature of the heat medium was the same. Then, the temperature of the heat medium when the predetermined pit shape was sufficiently transferred was determined.
- the thermoplastic resin used was a polycarbonate resin, and the molding cycle was 10 seconds. As a result of performing an injection molding experiment while changing the temperature of the heat medium in increments of 5 K, the heat medium temperature was about 15 K lower than when the low heat conductive plate 7 and the low heat conductive material 15 were not provided. It was found that a predetermined pit shape was obtained.
- the thickness of the low thermal conductive plate 7 and the low thermal conductive material 15 is preferably 2 mm or more from the viewpoint of ensuring workability.
- the initial speed at which heat is dissipated from the resin injected into the mold cavity 20 is substantially constant.
- the thickness of the low thermal conductive plate 7 and the low thermal conductive material 15 increases, the heat capacity of the low thermal conductive plate 7 and the low thermal conductive material 15 increases.
- the thickness of the low thermal conductive plate 7 and the low thermal conductive material 15 is 10 mm or less, and preferably 5 mm or less.
- the titanium alloy can contain aluminum, vanadium-molybdenum, iron and chromium in addition to titanium.
- Aluminum has the property of increasing creep strength. Vanadium, molybdenum, iron, chromium, etc. have properties that increase the Young's modulus and improve the calo workability.
- the aluminum content is preferably 2 wt% to 9 wt%, and the vanadium content is 2 wt% to: L 6 wt% is preferred from the viewpoint of mechanical properties and additive properties. More preferably, the content of aluminum is 2 wt% to 7 wt%, and the content of vanadium is 2 wt% to 6 wt%. In this case, a thin plate material having sufficient mechanical properties and workability can be produced. If the aluminum content is more than the above content, the Young's modulus decreases, and if the vanadium content is more than the above content, the workability decreases. If both aluminum and vanadium are less than the above contents, the respective effects cannot be obtained.
- the surface roughness (center roughness) of the low thermal conductive plates 7 and 15 is transferred through the stamper 6. From the viewpoint of ensuring the flatness of the surface of the optical disk substrate on which the image is to be transferred, it is desirable that the thickness be 0.2 / m or less.
- the surface roughness of the low thermal conductive plate 7 and the low thermal conductive material 15 is larger than 0.2 / Xm in center roughness, the undulation is transferred to the surface of the molded optical disk substrate, and focus and tracking of the optical disk substrate are not performed. The signal quality may be degraded and sufficient signal readout may not be possible.
- the surface roughness of the low thermal conductive material 15 has an effect only when data is recorded, erased, or reproduced on the disk substrate by laser light transmitted through the optical disk substrate, but does not pass through the optical disk substrate. When data is recorded, erased, or reproduced with laser light incident from the opposite side, the surface roughness of the low thermal conductive material 15 has almost no effect.
- the low thermal conductive plate 7 and the low thermal conductive material 15 as the low thermal conductive elements are provided above and below the cavity 20 in the mold, respectively, the heat medium for adjusting the mold temperature is provided. There is no need to raise the temperature too much. As a result, molding can be performed in approximately the same time as that of a conventional optical disk, and a high-density optical disk substrate can be manufactured without changing surface deflection or warpage.
- the inner peripheral side surface 27 of the outer peripheral ring 17 that defines the outer peripheral side surface of the optical disk substrate has a structure in which the outer peripheral side surface 29 of the low thermal conductive material 15 that forms the lower surface of the cavity 20 is fitted. Therefore, even if the resin filling pressure exceeds the mold compression pressure and the mold is slightly opened when the molten resin is filled, the outer peripheral ring 17 is urged toward the fixed mold 1 by the compression panel 22. In addition, no gap is formed in the cavity 20. Therefore, burrs do not occur on the outer peripheral side surface of the optical disk substrate.
- the low thermal conductive material 15 in contact with the sliding outer peripheral ring 17 is made of a member having sufficient mechanical properties, the sliding contact surface 24 of the low thermal conductive material 15 is worn. Therefore, there is no fear that the low thermal conductive material 15 is damaged.
- the non-engaging end 21 that is the lowermost end of the outer peripheral side surface 29 of the low thermal conductive material 15 is located below the lower end portion 26 of the outer peripheral ring 17 and the inner peripheral side surface of the outer peripheral ring 17.
- the lower end 26 of 27 is always overlapped with the outer peripheral side surface 29 of the low thermal conductive material 15.
- the lower end 26 of the outer peripheral ring 17 is within the range of the outer peripheral side surface 29 of the low thermal conductive material 15 in sliding contact, the side surface of the low thermal conductive material 15 rolls up and There is no danger of peeling from 16.
- the low thermal conductive material 7 as the low thermal conductive element does not directly face the cavity 20 and does not rub against sliding. It is not necessary to use the same material as 5, but it may be the same material.
- the low thermal conductive material 7 and the stamper 6 on the fixed mold 1 side are suctioned to a vacuum by the suction passage A of the same system, it is needless to say that the vacuum suction may be performed independently by the suction passages of another system. .
- thermoplastic resin a polycarbonate resin
- polyolefin resin acryl resin a polyolefin resin acryl resin and other resins can also be used.
- FIG. 5 is a detailed cross-sectional view of the outer peripheral portion of the disk substrate molding die according to the second embodiment of the present invention.
- the low thermal conductive material 15 extends on the outer peripheral side surface of the movable mirror panel 16, and the lower end 26 of the outer peripheral ring 11 is formed of the low thermal conductive material 15.
- the point which is located above the lowermost non-engaging end 21 is common.
- the lower end 26 of the outer peripheral ring 17 stops at a position above the non-engaging end 21 of the low thermal conductive material 15, and the low thermal conductive material 1
- the structure does not reach the position of the joint surface where the movable side mirror plate 16 and the movable side mirror plate 16 are joined. Therefore, also in this case, since the lower end portion 26 of the outer peripheral ring 17 is in the range ⁇ of the outer peripheral side surface 29 of the low thermal conductive material 15 in sliding contact, the low thermal conductive material 15 is There is no risk of peeling.
- the material of the low thermal conductive material 15 to have a Young's modulus of 10 OGPa or more, there is no danger that the sliding portion with the outer peripheral ring 17 will be worn and damaged.
- the injection-molded optical disc substrate since the outer periphery of the cavity 20 is flat, the injection-molded optical disc substrate has minute uneven pits and grooves as far as possible. Is formed. Since the low thermal conductive plate 7 and the low thermal conductive material 15 are provided above and below the cavity 20 in the mold, it is not necessary to increase the temperature of the heat medium for adjusting the mold temperature.
- the outer ring 17 that defines the outer peripheral side surface of the optical disk substrate has a structure in which the low thermal conductive material 15 that forms one wall surface of the cavity 20 is fitted. Therefore, even if the resin filling pressure exceeds the mold clamping pressure and the mold opens slightly when the molten resin is filled, the outer peripheral ring 17 is urged toward the fixed mold 1 by the compression panel 22. Therefore, no gap is formed in the cavity 20. Therefore, burrs do not occur on the outer peripheral side surface of the optical disk substrate.
- FIG. 6 is a schematic cross-sectional view of a disk substrate molding die according to a third embodiment of the present invention.
- Fig. 7 shows an enlarged detail of the X part of the outer periphery of the mold.
- the method of fixing the outer peripheral ring 17 and the method of fixing the low thermal conductive plate 7 and the low thermal conductive material 15 are different from those of the first embodiment. ing.
- Screw holes 42 that do not penetrate are provided on the upper surface of the outer peripheral portion of the low thermal conductive plate 7. Further, the fixed side mirror panel 8 is provided with a through hole 41 at a position matching the screw hole 42. The low thermal conductive plate 7 is fixed to the fixed mirror panel 8 by screwing the screws 32 into the screw holes 42.
- a screw hole 44 that does not penetrate is provided on the lower surface of the outer peripheral portion of the fixed mirror panel 8.
- the outer peripheral ring 17 is provided with a through hole 43 at a position matching the screw hole 44.
- the outer peripheral ring 17 is fixed to the fixed side mirror panel 8 by screwing a screw 34 into a screw hole 44.
- a screw hole 46 that does not penetrate is provided on the upper surface of the outer peripheral portion of the low thermal conductive material 15 on the movable mold 2 side. Further, the movable side mirror panel 16 is provided with a through hole 45 at a position matching the screw hole 46.
- the low thermal conductive material 15 is fixed to the movable mirror panel 16 by screwing a screw 36 into a screw hole 46.
- a dish hole 47 is formed in the lower part of the outer peripheral side surface 29 of the low thermal conductive material 15 on the movable mold 2 side.
- the movable side mirror panel 16 is provided with a screw hole 48 that does not penetrate at a position matching the countersunk hole 47.
- the outer peripheral side surface 29 of the low thermal conductive material 15 is embedded and fixed to the movable mirror panel 16 by screwing a screw 38 into a screw hole 48. Therefore, even if the inner peripheral side surface 27 of the outer peripheral ring 17 slides on the outer peripheral side surface 29 of the low thermal conductive material 15, it does not rub against the head of the screw 38.
- an optical disk substrate can be manufactured by injection molding a thermoplastic resin such as POV carbonate or polyolefin.
- the low thermal conductive plate 7 and the low thermal conductive material 15 are provided above and below the cavity 20 in the mold, the temperature of the heat medium for adjusting the mold temperature is too high. No need to do. As a result, molding can be performed in approximately the same time as that of the conventional pit density, and a high-density optical disc substrate can be manufactured without changing surface runout or warpage. Further, the outer ring 17 that defines the outer peripheral side surface of the optical disc substrate has a structure in which the low thermal conductive material 15 that forms the lower surface of the cavity 20 is fitted.
- the outer peripheral ring 17 is fixed on the fixed mold 1, the cavity 20 No gap is formed inside. Therefore, burrs do not occur on the outer peripheral side surface of the optical disk substrate. And, since the low thermal conductive material 15 in contact with the sliding outer peripheral ring 17 is made of a member having sufficient mechanical properties, the sliding contact surface 24 of the low thermal conductive material 15 is worn out. There is no danger that the low thermal conductive material 15 will be damaged.
- the non-engaging end 21 which is the lowermost end of the outer peripheral side surface 29 of the low thermal conductive material 15 is located below the lower end 26 of the outer peripheral ring 17 and the lower end 2 Since 6 always overlaps with the low thermal conductive material 15, there is no danger that the side surface of the low thermal conductive material 15 will roll up and separate from the movable mirror panel 16.
- the flat flat portion extends to the outer peripheral portion of the cavity 20, minute pits and grooves are formed as far as possible on the injection-molded optical disk substrate as much as possible.
- the low thermal conductive material 7 does not directly face the cavity 20 and also slides and rubs. It is not necessary to use the same material as the low thermal conductive material 15 because it does not occur, but the same material may be used.
- the outer peripheral portions of the stamper 6 and the low thermal conductive material 7 are fixed to the fixed-side mirror panel 8 by the fixing screws 34 of the outer peripheral ring 17, so that they are not necessarily required. It is not necessary to suck the stamper 6 from the suction passage A into a vacuum and fix it. Counterbore holes and countersunk holes were used for the screw attachments, but they could be interchanged or exactly the same.
- FIG. 8 shows a detailed cross-sectional view of the outer peripheral portion of the disk substrate molding die according to the fourth embodiment of the present invention.
- the disk substrate molding die according to the fourth embodiment also has a low heat conduction fixed to the movable mirror panel 16 with respect to the inner peripheral side surface 27 of the outer ring 17 fixed to the fixed mirror panel 8.
- the outer side surface 29 of the material 15 is configured to be in sliding contact.
- the disk substrate molding die of the fourth embodiment has a lower heat conductive material 15 extending to the outer peripheral portion of the movable mirror panel 16 than the disk substrate molding die of the third embodiment.
- the common point is that the lower end 26 of the outer peripheral ring 17 is located above the non-engaging end 21 that is the lowermost surface of the low thermal conductive material 15.
- the lower end 26 of the outer peripheral ring 17 stops at a position above the non-engagement end 21 of the low thermal conductive material 15 even when the movable mold 2 moves in the vertical direction.
- the structure is such that the conductive material 15 and the movable-side mirror panel 16 are not reached to the joint surface where the joint is formed. Therefore, also in this case, since the lower end portion 26 of the outer peripheral ring 17 is within the range of the outer peripheral surface 29 of the low thermal conductive material 15 in sliding contact, the low thermal conductive material 15 There is no fear of peeling from 6.
- the low thermal conductive material 15 may be damaged by abrasion at a portion where the low thermal conductive material 15 slides against the outer peripheral ring 17. Absent. Further, as in the case of the first embodiment, since a flat portion is secured also on the outer peripheral portion of the cavity 20, minute uneven pits and grooves can be formed on the injection-molded optical disk substrate. It is formed as far as the outer periphery. Then, a low thermal conductive plate 7 and a low thermal conductive material 15 are placed above and below the cavity 20 in the mold.
- the peripheral ring 17 that defines the side of the optical disc substrate is a cavity.
- the disk substrate molding die according to the fifth embodiment of the present invention has a lower thermal conductive material 15 than the disk substrate molding die according to the first to fourth embodiments. It is characterized in that the surface is coated with a highly rigid metal material. That is, in order to facilitate maintenance and management of the mirror surface on the titanium alloy used as the low thermal conductive material 15, it is coated with a metal material having a high degree of odor. It is desirable that this skin covering layer has better mechanical properties than a titanium alloy, and has a Young's modulus of 150 GPa or more, preferably 2 OOGPa or more, such as Eckel, chromium, tungsten, and molybdenum. Metals are preferred.
- the coating layer is composed of at least one selected from nickel, chromium, tungsten, and molybdenum.
- the coating method include a vacuum deposition method, a snow, a sputtering method, and a plating method.
- the coating layer formed by surface treatment such as plating tends to have higher hardness than the Balta product.
- the bitter hardness of Balta's nickel is 120 in Table 1, but it is about 300 for electroplated and about 500 for electroless plated.
- the Vickers hardness increases to about 900.
- the Vickers hardness of chrome in Balta products is usually about 400, but it is about 100 in the case of electric plating.
- a hard coating layer is formed on the low thermal conductive material 15.
- an electrolytic or electroless plating method is preferable. After the coating layer is formed by a process or the like, it is preferable to further perform a heat treatment.
- the surface roughness of the coating layer is desirably 0.2 ⁇ or less in terms of center roughness. This is to improve the signal quality by suppressing the undulation and the like of the surface of the injection-molded optical disc substrate to reduce the influence on light transmission and reflection.
- thermoplastic resin such as polycarbonate / polyolefin is injection-molded to produce an optical disk substrate.
- the temperature of the heat medium for adjusting the mold temperature is too high. No need to do.
- molding can be performed in approximately the same time as that of a conventional optical disk, and a high-density optical disk substrate can be manufactured without changing surface deflection or warpage.
- the outer ring 17 defining the outer peripheral side surface of the optical disk substrate is structured to fit with the low thermal conductive material 15 constituting the lower surface of the cavity 20.
- the outer ring 17 is fixed on the fixed mold 1 so that the cavity 2 No gap is formed in 0. Therefore, burrs do not occur on the outer peripheral side surface of the optical disk substrate. Since the low thermal conductive material 15 in contact with the sliding outer peripheral ring 17 is made of a member having sufficient mechanical properties, the sliding surface 24 of the low thermal conductive material 15 is worn. There is no danger that the low thermal conductive material 15 will be damaged.
- the non-engagement end 21 which is the lowermost end of the outer peripheral side surface 29 of the low thermal conductive material 15 is located below the lower end 26 of the outer peripheral ring 17 and the lower end of the outer peripheral ring 17 Since the part 26 always overlaps the low thermal conductive material 15, there is no danger that the side surface of the low thermal conductive material 15 rolls up and separates from the movable mirror panel 16.
- the free flat portion extends to the outer peripheral portion of the cavity 20, minute uneven pits and grooves are formed to the outer peripheral portion as much as possible on the injection-molded optical disk substrate.
- the metal coating layer is provided only on the low thermal conductive material 15, but of course, the low thermal conductive material Plate 7 may be provided with this metallization layer. In this case, it is necessary for the low thermal conductive plate 7 to be made of metal because it is necessary that the thermal expansion coefficients be substantially the same in order to prevent peeling. (Sixth embodiment)
- the disk substrate molding die according to the sixth embodiment of the present invention is provided with a DLC (diamond-like carbon diamond) on the metal coating layer of the low thermal conductive material 15 described in the fifth embodiment. -like carbon) or a lubricating thin film of a material containing fluorine.
- a thin film of DLC (diamond-like carbon) or a thin film of a material containing fluorine may be directly provided on the surface of the low heat conductive plate 7 or the low heat conductive material 15.
- the above-described lubricating thin film can be provided on the surface of the low heat conductive plate 7 or the low heat conductive material 15 as a low heat conductive element or on the surface of the metal coating layer.
- the temperature of the heat medium for adjusting the mold temperature is too low. There is no need to be high.
- molding can be performed in approximately the same time as that of the conventional pit density, and an optical disc substrate with a high pit density can be manufactured without changing the surface deflection or warpage.
- the outer ring 17 defining the outer peripheral surface of the optical disk substrate is configured to fit with the low thermal conductive material 15 constituting the lower surface of the cavity 20.
- the outer ring 17 is fixed on the fixed mold 1 so that the cavity 2 No gap is formed in 0. Therefore, burrs do not occur on the outer peripheral side surface of the optical disk substrate. Since the low thermal conductive material 15 in contact with the sliding outer peripheral ring 17 is made of a member having sufficient mechanical properties, the sliding contact surface 24 of the low thermal conductive material 15 is worn. Therefore, there is no danger that the low thermal conductive material 15 will be damaged. Furthermore, the non-engagement end 21 which is the lowermost end of the outer peripheral side surface 29 of the low thermal conductive material 15 is lower than the lower end 26 of the outer peripheral ring 17.
- the lower end 26 of the outer ring 1 ⁇ ⁇ always overlaps the low thermal conductive material 15, so the side of the low thermal conductive material 15 rolls up and the movable mirror panel 16 There is no danger of peeling.
- the free flat portion extends to the outer peripheral portion of the cavity 20, minute uneven pits and grooves are formed as far as possible on the injection-molded optical disk substrate.
- the low thermal conductive plate 7 and the low thermal conductive material 15 are fixed to the fixed-side mirror surface plate 4 and the movable-side mirror surface plate 16 by vacuum suction. are doing.
- the low heat conductive plate 7 and the low heat conductive material 15 are fixed to the fixed side mirror surface plate 4 and the movable side mirror surface plate 16 by screwing. It is fixed to.
- the low thermal conductive plate 7 and the low thermal conductive material 15 may be fixed to the fixed-side mirror panel 4 and the movable-side mirror panel 16 by both vacuum suction and screwing.
- the stamper is installed in the fixed mold, but it is needless to say that the stamper may be installed in the movable mold.
- the force described in the case where the injection molded product is an optical disk substrate is applicable to any disk shape.
- the disk substrate molding die and the disk substrate manufacturing method according to the present invention are useful for a molding method for obtaining an optical disk substrate or the like by molding a thermoplastic resin with a die. It is also applicable to applications such as a method for producing a surface gloss of a thermoplastic resin.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Manufacturing Optical Record Carriers (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2005503014A JP4197183B2 (ja) | 2003-03-03 | 2004-02-25 | ディスク基板成形用金型およびディスク基板の製造方法 |
US10/547,552 US7311516B2 (en) | 2003-03-03 | 2004-02-25 | Die for molding disk substrate and method of manufacturing disk substrate |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003-055520 | 2003-03-03 | ||
JP2003055520 | 2003-03-03 |
Publications (1)
Publication Number | Publication Date |
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WO2004078446A1 true WO2004078446A1 (ja) | 2004-09-16 |
Family
ID=32958664
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2004/002183 WO2004078446A1 (ja) | 2003-03-03 | 2004-02-25 | ディスク基板成形用金型およびディスク基板の製造方法 |
Country Status (5)
Country | Link |
---|---|
US (1) | US7311516B2 (ja) |
JP (1) | JP4197183B2 (ja) |
KR (1) | KR20060008286A (ja) |
CN (1) | CN100351064C (ja) |
WO (1) | WO2004078446A1 (ja) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008183765A (ja) * | 2007-01-29 | 2008-08-14 | Meiki Co Ltd | ディスク基板の成形用金型、ディスク基板の成形方法、およびディスク基板 |
WO2013031905A1 (ja) * | 2011-08-31 | 2013-03-07 | ポリプラスチックス株式会社 | 金型、及び金型の製造方法 |
JP2019093687A (ja) * | 2017-11-28 | 2019-06-20 | トヨタ紡織株式会社 | 成形型及び成形型の製造方法 |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4554330B2 (ja) * | 2004-10-21 | 2010-09-29 | 株式会社リコー | 高耐久性を有する断熱スタンパ構造 |
JP4345064B2 (ja) * | 2005-03-25 | 2009-10-14 | セイコーエプソン株式会社 | 光電変換素子の製造方法、および電子機器 |
KR20080012297A (ko) * | 2005-05-23 | 2008-02-11 | 스미도모쥬기가이고교 가부시키가이샤 | 디스크 성형용 금형, 경면반 및 디스크 성형용 금형의제조방법 |
JP4647568B2 (ja) * | 2006-09-12 | 2011-03-09 | 東洋機械金属株式会社 | 射出成形機 |
JP4750681B2 (ja) * | 2006-12-07 | 2011-08-17 | 住友重機械工業株式会社 | 断熱金型、金型部品、成形機及び断熱金型の製造方法 |
US8231821B2 (en) * | 2008-11-04 | 2012-07-31 | Molecular Imprints, Inc. | Substrate alignment |
US20110014881A1 (en) * | 2009-07-17 | 2011-01-20 | Cheng-Hsu Yang | Multi-functional communication module |
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JPH0573720U (ja) * | 1992-03-05 | 1993-10-08 | 三菱樹脂株式会社 | プレーンスタンパおよびディスク成形金型 |
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JP3005729B2 (ja) | 1991-09-11 | 2000-02-07 | 日本電気エンジニアリング株式会社 | 光学的文字読取装置 |
US5683630A (en) * | 1994-06-20 | 1997-11-04 | Matsushita Electric Industrial Co., Ltd. | Process for making optical disk substrates |
EP0872331A1 (en) * | 1997-04-16 | 1998-10-21 | Matsushita Electric Industrial Co., Ltd. | Stamper protecting layer for optical disk molding apparatus, optical disk molding apparatus and optical disk molding method using the stamper protecting layer |
JP3057077B1 (ja) * | 1999-03-08 | 2000-06-26 | シチズン時計株式会社 | 樹脂成形用金型および樹脂成形用金型への硬質被膜形成方法 |
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2004
- 2004-02-25 US US10/547,552 patent/US7311516B2/en not_active Expired - Fee Related
- 2004-02-25 JP JP2005503014A patent/JP4197183B2/ja not_active Expired - Lifetime
- 2004-02-25 WO PCT/JP2004/002183 patent/WO2004078446A1/ja active Application Filing
- 2004-02-25 KR KR1020057015740A patent/KR20060008286A/ko not_active Application Discontinuation
- 2004-02-25 CN CNB2004800055174A patent/CN100351064C/zh not_active Expired - Fee Related
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JPH0573720U (ja) * | 1992-03-05 | 1993-10-08 | 三菱樹脂株式会社 | プレーンスタンパおよびディスク成形金型 |
JPH0866945A (ja) * | 1994-06-20 | 1996-03-12 | Matsushita Electric Ind Co Ltd | ディスク用基板の製造方法及び製造装置 |
JPH1148291A (ja) * | 1997-08-04 | 1999-02-23 | Sony Corp | ディスク成形装置 |
JP2001310358A (ja) * | 2000-04-26 | 2001-11-06 | Hitachi Ltd | ディスク基板成形金型 |
JP2001334534A (ja) * | 2000-05-30 | 2001-12-04 | Ricoh Co Ltd | 断熱金型作製方法および作製装置 |
JP2003019717A (ja) * | 2001-05-01 | 2003-01-21 | Mitsubishi Engineering Plastics Corp | 金型組立体及び射出成形方法 |
Cited By (6)
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JP2008183765A (ja) * | 2007-01-29 | 2008-08-14 | Meiki Co Ltd | ディスク基板の成形用金型、ディスク基板の成形方法、およびディスク基板 |
WO2013031905A1 (ja) * | 2011-08-31 | 2013-03-07 | ポリプラスチックス株式会社 | 金型、及び金型の製造方法 |
CN103781607A (zh) * | 2011-08-31 | 2014-05-07 | 宝理塑料株式会社 | 模具及模具的制造方法 |
JP5519868B2 (ja) * | 2011-08-31 | 2014-06-11 | ポリプラスチックス株式会社 | 金型、及び金型の製造方法 |
CN103781607B (zh) * | 2011-08-31 | 2015-08-26 | 宝理塑料株式会社 | 模具及模具的制造方法 |
JP2019093687A (ja) * | 2017-11-28 | 2019-06-20 | トヨタ紡織株式会社 | 成形型及び成形型の製造方法 |
Also Published As
Publication number | Publication date |
---|---|
US20060188600A1 (en) | 2006-08-24 |
JP4197183B2 (ja) | 2008-12-17 |
CN100351064C (zh) | 2007-11-28 |
CN1756634A (zh) | 2006-04-05 |
JPWO2004078446A1 (ja) | 2006-06-08 |
KR20060008286A (ko) | 2006-01-26 |
US7311516B2 (en) | 2007-12-25 |
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