JPH0939040A - Disk substrate molding die device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To manufacture efficiently a double side recording disk substrate wherein patterns of a servo mark, an address code, etc., are mutually highly precisely registered. SOLUTION: A fixed die and a movable die which constitute a cavity wherein a disk substrate is molded, are provided, and a fixed side stamper and a movable side stamper are respectively attached to side surface parts opposed to those fixed die and movable die. For the movable die, a stamper fitting member built-in part 31 containing a registration fitting recessed part 41 is openly provided to a part of an inner peripheral wall, a registration fitting projected part 44 relatively fitted to the registration fitting recessed part 41 is integrally provided to an outer peripheral part, and besides the movable die is composed of them and a stamper fitting member 32 to which the movable stamper is fitted. For the fixed side stamper and the movable side stamper, alignment of a pattern is carried out with an alignment mechanism 40.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold device for molding a disk substrate that constitutes a disk-shaped recording medium such as an optical disk or a magneto-optical disk, and more particularly to a double-sided recording mold in which information signal recording portions are formed on both sides. The present invention relates to a mold device for molding a disk substrate.

[0002]

2. Description of the Related Art As a disk-shaped recording medium such as an optical disk, an optical disk used exclusively for reproduction and a magneto-optical disk capable of rewriting an information signal once recorded are known. A read-only optical disc is formed by forming a so-called pit, which is a concave-convex pattern corresponding to a predetermined information signal, on the surface of a disc substrate, and forming a reflective layer by vapor-depositing aluminum or the like. Also,
The magneto-optical disk is formed by forming a pre-group constituting a recording track on which a desired information signal is recorded on the surface of a disk substrate and forming a signal recording layer having a magnetic film.

A disk substrate 1 constituting these optical disks and the like is made of a synthetic resin such as a polycarbonate resin having a light transmitting property, and is installed in an injection molding machine.
It is molded by using the disk substrate molding die device 2 shown in FIG. The disk substrate molding die device 2 includes a fixed die 3
And the movable mold 4 which is moved toward and away from the fixed mold 3.
And are arranged to face each other. Cavities 5 (5A, 5B) that are molding spaces of the disk substrate 1 are defined in the fixed mold 3 and the movable mold 4 in a state where they are clamped on the opposite side surfaces.

Although not described in detail, the fixed mold 3 is provided with a nozzle 6 located at the center of the cavity 5 for injecting and filling the material resin melted from the injection molding machine side into the cavity. A sprue bush is provided. Further, in the fixed mold 3, a pre-groove forming a so-called pit or a recording track, which is an uneven pattern corresponding to an information signal, is formed on one side of the main surface of the disc substrate 1 facing the movable mold 4 forming the cavity 5. A fixed mold side stamper 7 formed on the surface is attached.

In the movable mold 4, a punch 8 for punching out the center hole 1A of the disk substrate 1 which is molded so as to project into the cavity 5 or the molded disk substrate 1 is a disk substrate molding mold device 2 An eject pin 9 which is pushed down from the inside is arranged so as to be able to move forward and backward with respect to the fixed mold 3.

In the conventional disk substrate molding die apparatus 2 having the above-described structure, the movable die 4 is clamped with respect to the fixed die 3, and the molten resin is discharged from the nozzle 6 of the sprue bush. The material is injection-filled into the cavity 5. The disk substrate 1 is generally molded by a compression molding method in order to prevent the occurrence of molding distortion, and the cavity 5
After the molten resin material is filled therein, the movable mold 4 is further moved to the fixed mold 3 side to cool and harden the resin material in a compressed state for molding.

After hardening, the disk substrate 1 is formed by punching the center hole 1A by operating the punch 8 and then ejecting it from the side of the movable mold 4 which has been opened by the eject pin 9.

[0008]

By the way, in the optical disc, there is also provided a double-sided recording type optical disc having a high recording capacity by forming information signal recording portions on the front and back surfaces. This double-sided recording type optical disk has a fixed mold 3 in the mold device 2 for molding a disk substrate described above.
7 attached to the side cavity forming portion 5A
Corresponding to the above, as shown by the chain line in FIG. 6, the stamper 7A is attached to the cavity forming portion 5B on the movable mold 4 side, so that the information signal is recorded on the front and back surfaces of the disk substrate 1 or the information signal to be recorded. A recording unit is formed.

These stampers 7 and 7A are precisely attached to the cavity forming portions 5A and 5B of the fixed mold 3 or the movable mold 4 through the mounting holes formed with extremely high precision. However, these mounting holes are ± 10 with respect to the center of the uneven pattern due to the limit of machining.
A variation of about μm occurs. Further, when these stampers 7 and 7A are mounted on the stamper mounting portion of the fixed mold 3 or the movable mold 4, the mounting dimension is ± 10 μm.
There is some variation. Further, when the fixed mold 3 or the movable mold is assembled to the die of the injection molding machine, the center axis L is displaced.

Due to such mechanical characteristics, the mold device for molding the disk substrate of the double-sided recording type optical disk has a problem that the eccentric amount of the concavo-convex pattern formed on the front and back surfaces of the disk substrate by the stamper reaches a maximum of 40 μm. There was a point.

By the way, in a 130 mm write-once type optical disk, for example, an area having a radius of 30 mm to 60 mm is a write-once area for enabling the additional recording of information signals, and the inner and outer circumference areas of this write-once area satisfy the recording and reproducing conditions. Pre-recorded control area with a radius of 29m
A region of m to 61 mm is defined as a manufacturer use region.

Further, the optical disc is provided with servo marks for controlling tracking of the magnetic head and the optical pickup. This servo mark corresponds to the tracking servo system, and has an A-shaped format composed of a substantially continuous guide groove for tracking,
There are two types of B format in which sample bytes are recorded in advance at appropriate positions in the recording area.

In the double-sided recording type optical disk, the servo mark, the address code of the information signal, the control area, and the like must be accurately aligned on the front and back surfaces. The double-sided recording type optical disc has a large circumferential deviation on the front and back surfaces, and when there is a phase deviation of patterns such as servo marks and address codes, it is loaded into a recording / reproducing device and recording or reproducing operation is performed to make it When the switching is performed, the servo operation and the tracking operation are required again, which causes a problem that high-speed processing cannot be performed.

In order to solve the above-mentioned problems, in the conventional double-sided recording type optical disk, for example, a method has been adopted in which disk substrates molded on one side each are accurately bonded to each other. However, such a double-sided bonded type optical disk may also have a problem that the bonded surface is deteriorated or deformed due to the influence of aging, heat, or the like. In addition, such a double-sided bonded optical disc has a problem that the number of manufacturing processes increases and the cost increases. Furthermore, in the case of a double-sided bonded optical disc, if a defect is found in the inspection process, etc., it is necessary to remove the stampers bonded to the front and back surfaces and re-bond them in a state where they have been aligned, and with high accuracy. There was a problem that it was extremely difficult to manufacture.

Therefore, the present invention solves the above-mentioned conventional problems and manufactures a double-sided recording type disk substrate in which patterns such as servo marks and address codes on the front and back surfaces are aligned with high precision at low cost. The present invention has been proposed for the purpose of providing a mold device for molding a disc substrate which is made possible.

[0016]

SUMMARY OF THE INVENTION A disk substrate molding die apparatus according to the present invention which achieves this object is movable with a fixed die forming a cavity in which disk substrates are molded so as to face each other. A fixed die stamper and a movable side stamper are respectively attached to side surfaces of the fixed die and the movable die that face each other. The movable mold has a stamper mounting member built-in portion in which a positioning fitting recess is provided in a part of an inner peripheral wall, and the movable mold is butted against a fixed mold to form a part of a cavity of a disk substrate. A movable stamper is attached to the main body and a side face, and a positioning fitting convex portion that engages with a positioning fitting concave portion on the stamper mounting member incorporating portion side is provided on the outer periphery and is combined with the stamper attaching member incorporating portion. And a positioning mechanism for adjusting the combined position of the stamper mounting member with respect to the stamper mounting member incorporating portion via the positioning fitting convex portion. It

The fixed side stamper and the movable side stamper are double-sided recording type discs in which the servo marks and address codes on the front and back surfaces are positioned with high precision by the phase alignment of the pattern performed by this alignment mechanism. Mold the substrate.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments of the present invention will be described in detail below with reference to the drawings. As shown in FIG. 1, the disk substrate molding die device 20 includes a fixed die 21 and a movable die 22 that is arranged to face the fixed die 21 and is moved toward and away from the fixed die 21. It is configured. The fixed mold 21 and the movable mold 22 are provided on opposite side surfaces of the disk substrate 10 in a clamped state.
The cavity forming portions that form the cavity 23, which is the molding space portion, are partitioned and formed.

The fixed mold 21 is mounted and supported on the fixed mold block 24 via a mounting means (not shown). Further, the movable mold 22 is mounted and supported on a movable mold block 25 which is reciprocally moved in the axial direction by a driving means via a mounting means (not shown). The fixed mold block 24 and the movable mold block 25 are mounted and supported by the mold mounting portion of the injection molding machine by a structure whose details are omitted.

The fixed mold 21 is located at the center of the cavity 23 and has a nozzle 26 for injecting and filling a molten material resin 15, for example, a transparent polycarbonate resin, supplied from the injection molding machine side into the cavity 23. The sprue bush 27 having the is attached. The sprue bush 27 is a punch 32 on the movable mold 22 side, which will be described later.
The disk substrate 10 is cut and removed by
It is provided so as to correspond to the central cutting region 12 that constitutes the central hole 11.

The fixed mold 21 has a side surface facing the movable mold 22 forming the cavity 23 as a highly accurate smooth surface, and has a pit or a recording pattern which is a pit or a recording track corresponding to an information signal. In order to form the groove on one main surface of the disk substrate 10, a fixed stamper 28 having a precise concave-convex pattern formed on the main surface is attached. The fixed stamper 28 is formed in a disk shape having a center hole in the center.

The fixed stamper 28 is, as described above,
Since the high-temperature material resin is a member attached to the fixed mold 21 side that is injected into the cavity 15 by high pressure, it is firmly attached to the fixed mold 21 in a precisely aligned state.

Further, a disk-shaped stamper holder 29 for positioning and supporting the fixed stamper 28 is arranged on the outer periphery of the sprue bush 27 in the fixed mold 21. Although not described in detail, the stamper holder 29 is integrally formed with an annular engaging projection for engaging the center hole of the fixed stamper 28 and restricting the mounting position on the outer peripheral edge on the tip side. . Therefore, the fixed stamper 28 is attached to and supported by the stamper holder 29 in a centered state.

The fixed stamper 28 is provided with a mounting hole in an appropriate area that does not hinder the fixing die 2 in a state of being centered by the above-mentioned engaging projection through the mounting hole.
Although it is configured to be attached to the side surface of the fixed mold 21, it may be attached to the side surface of the fixed mold 21 by using, for example, a vacuum suction means.

On the other hand, the movable mold 22 is assembled inside the movable mold body 30 in which a stamper mounting member incorporating portion 31 having a circular cross section is provided so as to penetrate therethrough. It is composed of a disk-shaped stamper attachment member 32 and a movable stamper 33. The movable mold main body 30 is provided with a fixed mold 2 on a side surface facing the fixed mold 21 during a mold clamping operation of the movable mold 22 and the fixed mold 21, which will be described later.
An annular convex portion 30A forming an outer peripheral edge portion of the cavity 23 is integrally projectingly provided by being engaged with an annular concave portion 21A provided on the opposing side surface on the first side.

The stamper mounting member 32 is assembled to the stamper mounting member assembling portion 31 of the movable mold body 30 in a state of being aligned by the aligning mechanism 40 described later. The stamper mounting member 32 is composed of a disk-shaped member having a diameter slightly smaller than the inner diameter of the stamper mounting member incorporating portion 31 so that the stamper mounting member 32 can be combined with the movable mold body 30. Therefore, a gap of about 0.01 mm to 0.1 mm is formed between the inner peripheral surface of the stamper mounting member incorporating portion 31 and the outer peripheral surface of the stamper mounting member 32.

The side surface of the stamper mounting member 32 facing the fixed mold 21 forming the cavity 23 is formed as a highly accurate smooth surface, and forms a pit or recording track which is an uneven pattern corresponding to an information signal. In order to form a pre-groove on the other main surface of the disk substrate 10, a movable stamper 33 having a precise concave-convex pattern formed on the main surface is attached. The movable stamper 33 is formed in a disk shape having a central hole 33A in the central portion.

The movable mold 22 has a cavity 23.
An ejector pin 35 located in the center of the stamper mounting member 32 for ejecting the molded disk substrate 10 from the movable mold 22 during the releasing operation described later is disposed in the guide hole 34 provided in the center of the stamper mounting member 32. . The eject pin 35 is the disc substrate 1 on which the information signal recording portion is not formed.
It has a cylindrical shape having an outer diameter dimension corresponding to the central region 13 of 0, and the punch 36 is arranged inside so as to be able to move forward and backward. The punch 36 is projected into the cavity 23 by a driving source (not shown) to cut and form the central hole 11 in the central cutting region 12 of the disk substrate 10.

In the disk substrate molding die apparatus 20 configured as described above, the movable die 22 moves closer to the fixed die 21 by the operation of the driving means (not shown), and the die clamping state is established. Thus, the cavity 23 is formed. In this mold clamped state, the material resin melted from the nozzle 26 of the sprue bush 27 is injected and filled into the cavity 23. In the disk substrate molding die device 20, the movable die 22 is further moved to the fixed die 21 side, and the material resin filled in the cavity 23 is compressed and clamped to perform cooling.

In the disk substrate molding die device 20, after a predetermined cooling time has elapsed, the material resin filled in the cavity 23 is cured and the disk substrate 10 is molded. Thereafter, in the disk substrate molding die device 20, the driving means operates to move the movable die 22 away from the fixed die 21 to perform the die opening operation, and the punch 8 fixes the fixed die. A central hole 11 is formed by abutting on the central cutting region 12 of the disk substrate 10 so as to project toward the 21 side. The disk substrate 10 is ejected from the movable mold 22 side by an eject pin 35 that operates while the fixed mold 21 and the movable mold 22 are opened, and is taken out by a take-out mechanism (not shown).

As described above, the mold device 20 for molding the disk substrate is provided with the fixed-side stamper 28 and the movable-side stamper 33 on the fixed mold 21 and the movable mold 22, respectively. The double-sided recording type disk substrate 10 having pregrooves forming pits or recording tracks, which are concavo-convex patterns, corresponding to the fixed stamper 28 and the movable stamper 33 is formed.

By the way, a mold device 2 for molding a disk substrate
0 means that the movable side stamper 33 is fixed by the positioning mechanism 40 because the disk substrate 10 is formed in which the patterns of the servo marks on the front and back surfaces, the address code of the information signal or the control area are precisely matched with each other. The combination position with respect to the stamper 28 is precisely adjusted. More specifically, the disk substrate molding die device 20 includes a stamper attachment member 3 in which a movable side stamper 33 is attached to a movable die body 30 via an alignment mechanism 40.
Two are aligned and combined.

As shown in FIGS. 2 and 3, the positioning mechanism 40 includes a positioning fitting concave portion 41 provided in a part of the stamper mounting member assembling portion 31 provided on the movable mold body 30 side.
A guide hole 42 provided through one side of the movable mold body 30 with the positioning fitting recess 41 interposed therebetween, a bottomed hole 43 provided on the other side, and a positioning fitting provided on the stamper mounting member 32 side. It is composed of a fitting convex portion 44, an adjusting screw 45 screwed into the guide hole 42, and a coil spring 46 and a ball 47 incorporated in the bottomed hole 43.

As shown in FIG. 3, the positioning fitting concave portion 41 has an axial direction of a rectangular cross section having one end side opened to the back side of the movable mold body 30 on the inner peripheral wall of the stamper mounting member incorporating portion 31. It is configured as a keyway. The positioning fitting recess 41 has a stamper mounting member 32, as will be described later.
The side positioning fitting convex portion 44 is relatively engaged. The guide hole 42 and the bottomed hole 43 are provided in the movable mold body 30 with their axes aligned with each other and one end of each of which is opened in the positioning fitting recess 41. The guide hole 42 has the other end opened on the side surface of the movable mold body 30, and a precision screw (not shown) is formed on the inner peripheral wall.

The adjusting screw 45 has a length dimension substantially equal to the length dimension of the guide hole 42, and is screwed into the guide hole 42 from the opening portion on the one side surface side of the movable mold body 30 so as to be able to move back and forth. The adjustment screw 45 is screwed deeply into the guide hole 42 so that the tip end portion of the adjustment screw 45 is positioned and fitted into the positioning fitting recess 41.
The tip portion is retracted from the inside of the positioning fitting concave portion 41 by being exposed and protruding inward, and being rotated in the extracting direction.
On the other hand, the coil spring 44 is assembled in the hole with a bottom 43 in a slightly compressed state. The ball 45 is assembled so as to close the opening of the bottomed hole 43,
The elastic force of the coil spring 44 gives the habit of protruding into the positioning fitting recess 41.

The positioning fitting convex portion 44 is formed by the movable mold body 3
As a rectangular convex portion having an outer dimension slightly smaller than the cross-sectional dimension of the positioning fitting concave portion 41 on the 0 side, the rectangular convex portion is integrally formed on the outer peripheral portion on the back side of the stamper mounting member 32.
The positioning fitting convex portion 44 is relatively engaged with the positioning fitting concave portion 41 on the stamper mounting member incorporating portion 31 side in a state where the stamper attaching member 32 is combined with the stamper mounting member incorporating portion 31 of the movable mold body 30. By combining
The movable-side stamper 33 attached to the main surface of the stamper attachment member 32 in the entire movable die 22 is positioned.

Since the positioning fitting convex portion 44 has the above-mentioned dimensional characteristics, as shown in FIG. 3, a small amount is entirely provided between the outer peripheral wall thereof and the inner peripheral wall of the positioning fitting concave portion 41. Make a gap. This gap is provided between the inner peripheral surface of the stamper mounting member incorporating portion 31 and the stamper mounting member 32 described above.
0.01mm to 0.1m configured between the outer peripheral surface of
It is almost equal to the gap of m.

In the state in which the stamper mounting member 32 is assembled to the stamper mounting member assembling portion 31 of the movable mold body 30, the positioning fitting convex portion 44 has movable metal members on both sides thereof as shown in FIG. The tip end portion of the adjusting screw 43 and the ball 45 biased by the elastic force of the coil spring 44, which constitute the positioning mechanism 40 assembled on the mold body 30 side, are located on the same axis on both side surfaces thereof. Abut.

The disk substrate molding die unit 20 is constructed by positioning the fixed die 21 and the movable die 22 with relatively high accuracy. Further, in the disk substrate molding die device 20, the fixed stamper 28 and the movable stamper 33 are attached to the fixed die 21 and the movable die 22 through mounting holes or the like in which the fixed stamper 28 and the movable stamper 33 are formed with high precision. Each is installed. As described above, the movable stamper 33 is attached to the stamper attaching member 32 that is attached to the stamper attaching member assembling portion 31 provided in the movable mold body 30.

Therefore, the fixed side stamper 28 and the movable side stamper 33 are gaps formed between the movable mold body 30 and the stamper mounting member 32, in other words, the positioning fitting concave portion 41 and the positioning fitting convex portion. As shown in FIG. 4, the phase of the pattern of each servo mark, address code, or the like may deviate in the circumferential direction due to the gap formed between the pattern 44 and 44. The phase shift Δθ1 between the patterns of the fixed side stamper 28 and the movable side stamper 33.
Is about 10 ° when the gap between the positioning fitting concave portion 41 and the positioning fitting convex portion 44 is 0.05 mm.

Therefore, in the disk substrate molding die device 20, the fixed side stamper 28 is moved by the positioning mechanism 40.
The operation of aligning the movable stamper 33 with respect to is performed to adjust the phase shift of the above-described pattern. That is, the disk substrate molding die device 20 adjusts the position of the movable-side stamper 33 on the movable die 22 side by adjusting the adjusting screw 45 constituting the alignment mechanism 40 from the outside of the movable die body 30. Is done.

When the adjusting screw 45 is deeply screwed into the guide hole 42, the tip of the adjusting screw 45 gradually projects into the positioning fitting concave portion 41, and the positioning fitting convex portion relatively engaged with the positioning fitting concave portion 41. The portion 44 is moved to the opposite side against the elastic force of the coil spring 46. Further, the adjusting screw 45 is turned in the direction to be pulled out from the guide hole 42, so that the tip end thereof gradually recedes from the inside of the positioning fitting recess 41, and the positioning fitting relatively engaged with the positioning fitting recess 41. Coil spring 4 of protrusion 44
The movement operation by the elastic force of 6 is permitted. by this,
The stamper mounting member 32 is oscillated as a whole in the circumferential direction with respect to the movable mold body 30 with the ball 47 as a fulcrum.

The stamper mounting member 32 is adjusted by adjusting the adjusting screw 45 described above.
The elastic force moves the inside of the stamper mounting member assembling portion 31 in the circumferential direction, but the ball 47 is interposed as the abutting member of the positioning fitting convex portion 44, so that it operates smoothly. In other words, the ball 47 constitutes the fulcrum portion of the positioning fitting convex portion 44 that moves in the positioning fitting concave portion 41 as described above.

In the disk substrate molding die device 20, as shown in FIG. 5, the movable side stamper 33 is aligned with the entire movable die 22 by the above-mentioned alignment mechanism 40. 33 and the fixed stamper 28 of the fixed mold 21 are precisely aligned with each other to adjust the phase shift of the pattern. In the disk substrate molding die device 20, when the gap between the positioning fitting concave portion 41 on the movable mold body 30 side and the positioning fitting convex portion 44 on the stamper mounting member 32 side is 0.05 mm, the fixed side stamper is provided. The phase shift Δθ2 between the patterns of the movable stamper 28 and the movable stamper 33 is managed within 0.3 °.

Therefore, in the optical disc using the disc substrate 10 molded by the disc substrate molding die device 20 as a material, the phase shift of the patterns such as the servo marks on the front and back surfaces, the address code of the information signal or the control area is small. Since it is formed with high accuracy, it becomes unnecessary to perform the servo operation and the tracking operation again when the recording / reproducing operation is performed and the recording / reproducing operation is performed to switch the front and back surfaces, which enables high-speed processing. To do.

In the disk substrate molding die device 20 described above, when the positioning fitting convex portion 44 is adjusted in the positioning fitting concave portion 41, the positioning fitting convex portion 44 and the coil spring 46 are combined. Although the fulcrum portion is formed by interposing the ball 47 therebetween, for example, the tip portion of the coil spring 46 is directly brought into contact with the side surface of the positioning fitting convex portion 44 to eliminate the need for the ball 47. Of course, it is also good. In addition, the coil spring 46
For, for example, a leaf spring having a convex portion that abuts the side surface of the positioning fitting convex portion 44 may be replaced.

[0047]

As described in detail above, according to the disk substrate molding die apparatus of the present invention, the stamper mounting member having the movable side stamper combined with the stamper mounting member incorporating portion has the movable metal member. Patterns such as servo marks of fixed-side stampers and movable-side stampers that form an information signal recording part on the front and back surfaces of the disk substrate, which are adjusted by the alignment mechanism with respect to the die main body, address code of information signals, or control areas, etc. Since the components are aligned with each other with high accuracy, it is possible to manufacture the disk substrate with high accuracy by the integral molding method with high manufacturing efficiency.

Further, since the positioning operation of the fixed side stamper and the movable side stamper is performed extremely easily, the working efficiency is maintained and no skill is required.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of an essential part of a disk substrate molding die device shown as a specific embodiment according to the present invention.

FIG. 2 is an exploded longitudinal sectional view of a main part for explaining a configuration of a movable mold provided in the disk substrate molding mold device.

FIG. 3 is a vertical cross-sectional view of a movable mold body that constitutes the movable mold.

FIG. 4 is an explanatory view showing a state before a positioning operation with respect to a fixed side stamper attached to a fixed die and a movable side stamper attached to a movable die.

FIG. 5 is an explanatory view showing a state of the fixed side stamper and the movable side stamper after a positioning operation.

FIG. 6 is a vertical cross-sectional view of a main part of a conventional die for molding a disk substrate.

[Explanation of symbols]

 10 Disc Substrate 11 Center Hole 15 Material Resin 20 Disc Substrate Molding Device 21 Fixed Die 22 Movable Die 23 Cavity 28 Fixed Side Stamper 30 Movable Die Main Body 31 Stamper Attachment Member Assembly 32 Stamper Attachment Member 33 Movable Side Stamper 40 Positioning mechanism 41 Positioning fitting recess 42 Guide hole 43 Bottom hole 44 Positioning fitting projection 45 Adjustment screw 46 Coil spring (elastic member) 47 Ball

Claims (2)

[Claims] 1. A fixed mold and a movable mold, which are arranged so as to face each other and constitute a cavity for molding a disk substrate, are provided, and side surfaces of the fixed mold and the movable mold which face each other are opposed to each other. In a disk substrate molding die device for mounting a fixed-side stamper and a movable-side stamper to form a double-sided recording type disk substrate, a movable die is a stamper in which a positioning fitting recess is provided in a part of an inner peripheral wall. A movable mold main body that has a mounting member built-in portion that is abutted against a fixed mold to form a part of the cavity of the disk substrate, and a movable-side stamper is mounted on the side surface and a stamper mounting member built-in portion on the outer peripheral portion. Of the side of the disk substrate, which is provided with a positioning fitting convex portion that engages with the positioning fitting concave portion of the side And a positioning mechanism that adjusts the combined position of the stamper mounting member with respect to the stamper mounting space through the positioning fitting convex portion. With this positioning mechanism, the pattern of the fixed-side stamper and the movable-side stamper can be adjusted. A mold device for molding a disk substrate, which is characterized in that phase matching is performed. 2. The positioning mechanism is disposed on the movable mold main body portion on the same axis with the positioning fitting concave portion interposed therebetween, and the tip end is exposed to the positioning fitting concave portion to attach the stamper. The mold device for molding a disk substrate according to claim 1, wherein the stamper mounting member combined with the member assembling portion is composed of an adjusting screw and an elastic member that are in contact with the positioning fitting convex portion. .