JP3387727B2 - Disk forming die and disk forming method - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a disk molding die and a disk molding method for molding a synthetic resin optical disk substrate (including a magneto-optical disk substrate) onto which predetermined information is transferred by a stamper.

[0002]

2. Description of the Related Art Optical discs have come to be used as information recording media in a wide range of fields such as audio, video, and computers, and their manufacture is generally performed by a fixed metal forming a disc molding cavity between mold mating surfaces. Using a molding die including a mold and a movable mold, a stamper having predetermined information such as a concave-convex pattern (pit) corresponding to an information signal and a pre-groove forming a recording track is engraved on the surface of the molding die. In the state of being mounted on the cavity forming surface, the molding cavity is filled with a predetermined resin material, and the disc on which the stamper information is transferred is molded.

By the way, in such a mold,
For reasons such as the mold structure of the drive mechanism of the ejector sleeve that separates the molded product and the adhesion of the molded product to the stamper, etc., the stamper is generally attached to the movable mold side, and at the time of opening the mold, The disc molded in the molding cavity remains and is retained on the movable mold side. After the mold is completely opened, the ejector mechanism provided on the movable mold makes the disk molded product movable. It is designed to be released from the mold.

However, in the mold having the conventional structure,
During the period from the opening of the mold to the ejection of the disk molded product, that is, during the mold opening process, the disk molded product may be completely released from or separated from the cavity forming surface of the movable mold. There is a risk that the molded disk product may be damaged by dropping from the movable mold before it is ejected by the ejector mechanism.

In particular, in order to suppress the occurrence of imperfect transfer of stamper information such as stains and haze, or unevenness in mold release in a disc molded product, before the mold opening process, during the cooling process of the molded product, It has been confirmed that it is effective to apply compressed air to the cavity forming surface of the movable mold to exert the mold releasing force from the stamper on the disk molded product. If the disc molded product is released from the stamper, the
The disc molded product is simply caught by the male cutter for punching the center hole of the disc and held on the movable mold side.Therefore, the disc molded product does not fall off the movable mold before the completion of mold opening. There was a problem that the possibility became even greater.

[0006]

The present invention has been made in view of the above-mentioned circumstances, and a problem to be solved by the present invention is to provide a disc in a process of opening a movable mold from a fixed mold. An object of the present invention is to provide a disk molding die having an improved structure in which a molded product is prevented from falling off from a movable mold, and an improved disk molding method.

Further, according to the present invention, it is possible to prevent the disc molded product from falling out of the movable mold during the mold opening step, while suppressing the occurrence of improper transfer of stamper information and the mold release unevenness in the disk molded product. Another object of the present invention is to provide a disk molding die having an improved structure and an improved disk molding method.

[0008]

In order to solve such a problem, a feature of the present invention regarding a disk molding die is that a central portion of a movable side mirror block is arranged in a mold matching direction.
A circle that passes through and presses the inner peripheral edge of the stamper
Cylindrical inner presser holder and center hole of the inner presser holder
Stationary sleeve fixedly placed through the sleeve
And inserted through the central hole of the stationery sleeve,
An ejector sleeve that is movable in the axial direction;
Arranged for axial movement through the center hole of the ejector sleeve
And a movable male sleeve,
Lock surfaces, inner presser holders, stationary
The axial end faces of the sleeve and ejector sleeve
The cavity forming surface on the movable side is formed in cooperation.
Made using a movable mold, and allowed to attach the stamper in the cavity forming surface of the movable mold to form a molding cavity by being die matching the stationary mold, to mold the disc information of the stamper has been transferred In the disk forming die, the opening is formed in the cavity forming surface of the movable die.
The first compressed air passage, which is
The cavity forming surface is opened from between the
It is installed so that it can be forwarded through the first compressed air passage.
For disk molded products molded in the molding cavity
In addition to allowing release force by compressed air,
A negative pressure air passage separate from the first compressed air passage,
From between the stationery sleeve and the ejector sleeve
It is provided so as to open on the cavity forming surface, and by applying a negative pressure suction force to the disk molded product molded in the molding cavity through the negative pressure air passage, the fixed mold of the movable mold is When the mold is opened, the disk molded product is held on the cavity forming surface of the movable mold.

That is, in the disc molding die having such a structure, since the disc molding product is sucked and adsorbed on the cavity forming surface of the movable mold during the mold opening operation, the disc molding product is movable. Drops from the mold and the resulting damage can be advantageously prevented.

[0010] Oite to such disk molding mold, a negative pressure air passage, it is also possible to drill formed through the interior of the mold member constituting the cavity forming surface, claim
In the present invention described in 1, wherein the negative pressure air passage, a predetermined formed is brought arrangement position within the central hole of the stamper cooperatively cavity forming surface of the movable mold <br/> It is also characterized in that it is constituted by a gap opening between the mold members in the cavity forming surface.

[0011] In the disk mold is such a structure, the negative pressure air passage, it is the can be easily formed with a simple structure.

Further, the present invention described in claim 2, the second on the release force from the stamper to the disc molded product brought discharging compressed air on the cavity forming surface of the movable mold The compressed air passage is also provided on the outer peripheral side of the stamper in addition to the first compressed air passage on the inner peripheral side of the stamper .

[0013] In the disk mold is such a structure, releasability from the cavity forming surface of the movable mold in a disk molded article is obtained is advantageously and stably exhibited, a mold release nonuniformity Occurrence of defective products due to this can be effectively prevented.

Further , in the present invention , compressed air is discharged onto the cavity forming surface of the movable mold to exert a releasing force from the stamper on the disk molded product.
The first compressed air passage, wherein the negative pressure air passage is formed separately, in a state under that adversely negative pressure suction attraction to said disk shaped article through the negative pressure air passage, said first compressed air passage It is also characterized in that a releasing force can be applied to the disk molded product through.

[0015] In the the disk mold is such a structure, the mold opening process, the negative pressure suction force of attraction exerted on the disk shaped article through the negative pressure air passage, the disc molded article on the movable mold side In the mold-holding process from the middle of the cooling process in the held state , it is possible to release the disc molded product from the stamper by the releasing force exerted on the disc molded product through the compressed air passage in the mold opening process. It is possible to prevent the stamper information from being improperly transferred and the release unevenness from occurring while preventing the stamper information from falling off from the movable mold.

Further, in order to solve the above-mentioned problems, a feature of the present invention regarding the disk molding method is that the central portion of the movable side mirror block is arranged in the mold matching direction.
Presses the inner peripheral edge of the stamper, which is installed through
Cylindrical inner presser holder and center of the inner presser holder
Stationary Lithium fixedly placed through the hole
And through the central hole of the stationary sleeve.
And an ejector sleeve that is movable in the axial direction,
Inserted through the center hole of the ejector sleeve so as to be movable in the axial direction.
And a movable cutter mirror provided with the male cutter sleeve.
-The surface of the block, the inner presser foot holder, and the station
Axial end faces of Nari sleeve and ejector sleeve
The movable side cavity forming surface is formed by
Is a movable mold used comprising, by allowed mounted a stamper in the cavity forming surface of the movable mold, filling a resin material into the mold cavity formed between the movable Dokin type and die matching surface of the stationary mold Thus, when molding the disc to which the information of the stamper has been transferred, the cavity of the fixed mold after the completion of the cooling process from the middle of the cooling process of the movable mold before opening the mold from the fixed mold. disk shaped article with allowed to release from the cavity forming surface of the stationary mold and allowed to discharge compressed air on the forming surface, in the mold opening process from the fixed mold of the movable mold, the movable mold stearate Shonai sleeve and ejecta three
It is installed so that it opens from the gap between the
A negative pressure air passages to adversely negative pressure suction attraction to the movable Dokin type cavity forming surface on to the disk shaped article
The movable mold with respect to the disk molded product under the condition
Press between the inner presser foot holder and the stationary sleeve of
First compression provided to open on the cavity forming surface
Compressed air is discharged from the air passage to exert a releasing force, so that when the movable mold is opened from the fixed mold, the disk molded product is provided with a cavity forming surface of the movable mold. It is designed so that it can be held above. In addition,
The discharge of compressed air onto the cavity forming surface of the fixed mold is
It is not necessary to continuously perform the whole period from the middle of the cooling process before the mold opening to the completion of the cooling process, and it may be performed at an appropriate time point within the period.

That is, according to such a method of the present invention, in the mold opening step, the disk molded product is adsorbed to the movable mold side and is air blown off from the fixed mold side. Can be prevented from falling off from the movable mold, and the occurrence of disc defects due to uneven release from the fixed mold can be suppressed.

Further , according to the present invention , the process is continuous, intermittent or temporary from the middle of the cooling process to the protrusion of the disk molded product from the movable mold after the mold opening is completed. in, and allowed to discharge compressed air on the cavity forming surface of the movable mold, even such a disc shaped article that is released from the stamper, adoption
To be done.

According to such a method of the present invention, since the disk molded product is released from the stamper by air blow,
Occurrence of improper transfer of stamper information, uneven release, and the like can be suppressed, and the quality and stability of the disk molded product can be improved.
Further, particularly, if compressed air is discharged before the cooling is completed and the disk molded product is air blown from the stamper, transfer defects such as pit displacement can be more effectively prevented.

Further, the present invention described in claim 4, upper
In addition to the requirements described above , is the second compressed air passage provided on the outer peripheral side of the stamper with respect to the disk molded product ?
Et be allowed discharging compressed air, so as to exert a release force
Characterized in that was.

According to the method of the present invention as set forth in claim 4 , the mold releasing force from the stamper with respect to the disk molded product is obtained.
Can be exerted in an advantageous and stable manner, which is caused by uneven release.
It is possible to effectively prevent the occurrence of defective products.

[0022]

[0023]

[0024]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings in order to more specifically clarify the present invention.

First, FIG. 1 shows an outline of a main part of a disk molding apparatus for molding a disk substrate (disk molded product) for giving an optical disk. This molding apparatus includes a fixed mold 10 as a molding mold and a movable mold 12, and although not shown, the fixed mold 10 is attached to a fixed plate of the mold clamping device, while the movable mold 12 is attached. Are attached to and supported by the movable plate of the mold clamping device, and the fixed mold 10 and the movable mold 12 are opened and closed by the movement of the movable plate in the approaching / separating direction with respect to the fixed plate. . Then, as shown in the drawing, the fixed mold 10 and the movable mold 12 are matched with each other to form a molding cavity 14 of the disk between the molding surfaces. The disk molded product 16 is molded by filling the resin material with a resin material and cooling and solidifying the resin material.

More specifically, the fixed mold 10 has a fixed-side mirror block 18 on the side where the molding cavity 14 is formed, and the central portion of the fixed-side mirror block 18 is penetrated in the mold matching direction. The center bush 20 is fixedly arranged, and the sprue bush 22 is inserted through the center hole of the center bush 20. In addition,
In the present embodiment, the inner peripheral edge portion of the center bush 20 constitutes a female cutter for punching out the center hole of the disc.

A fixed cavity forming surface 24 is formed in cooperation with the surface of the fixed mirror block 18 and the axial end surface of the center bush 20. In addition, inside the center bush 20, the first air passage 2
6 is formed, and the first air passage 26 is opened to the fixed side cavity forming surface 24 through the annular discharge port 28 provided in the gap between the fixed side mirror block 18 and the member of the center bush 20. ing. Then, the compressed air supplied through the first air passage 26 is discharged from the annular discharge port 28 to the fixed side cavity forming surface 24, so that the fixed side of the disk molded product 16 formed in the molding cavity 14 is fixed. The mold releasing force from the cavity forming surface 24 is exerted.

On the other hand, the movable mold 12 has a movable side mirror block 30 on the side where the molding cavity 14 is formed. Cylindrical inner circumference holder 32
Is inserted and is fixedly and detachably attached by a screw mechanism or the like (not shown). In addition, the inner peripheral presser holder 32 has
An annular claw portion 33 is integrally formed that projects slightly in the axial direction and extends outward in the radial direction onto the surface of the movable mirror block 30. A stationary sleeve 34 is inserted through the center hole of the inner peripheral pressing holder 32 to be fixedly arranged with respect to the movable side mirror block 30, and the center of the stationary sleeve 34 is An ejector sleeve 36 is inserted through the hole so as to be axially movable while being guided by the stationary sleeve 34. Further, a male cutter sleeve 38 is axially movably inserted through the center hole of the ejector sleeve 36, and the male cutter sleeve 38 is also provided.
A rod-shaped ejector pin 40 is disposed so as to penetrate the center axis of the shaft in the axial direction and to be movable in the axial direction.

As a result, in the movable mold 12, the surface of the movable mirror block 30 and the inner peripheral pressing holder 32 and the stationary sleeve which are concentrically arranged in the central portion of the movable mirror block 30. The movable side cavity forming surface 42 is formed in cooperation with the axial end surfaces of the ejector sleeve 36 and the ejector sleeve 36. Then, after the fixed mold 10 and the movable mold 12 are opened, the ejector sleeve 36 is caused to project toward the molding cavity 14 side so that the disk molded product 16 is moved.
It is designed to be ejected from the 2nd side.
Furthermore, the male cutter sleeve 38 is driven to project by a predetermined amount in the axial direction by a drive mechanism (not shown) after the molding cavity 14 is filled with the resin material, and the center bush 20 of the fixed die 10 constituting the female cutter is driven. The disc central hole 68 is punched out by being inserted into the center hole of the disc.

The stamper 4 is provided on the surface of the movable mirror block 30 which constitutes the movable cavity forming surface 42.
4 are superposed, and the stamper 4 is attached to the disk molded product 16 molded in the molding cavity 14.
Information such as pits and pregrooves formed on the surface of No. 4 is transferred. Here, the inner peripheral edge portion of the stamper 44 is the annular claw portion 33 of the inner peripheral pressing holder 32.
Is held on the surface of the movable mirror block 30. Furthermore, the movable side mirror block 30
Has an annular groove 46 opening to the outer peripheral portion of the surface on which the stamper 44 is superposed, and a second air passage 48 is connected to the bottom of the groove 46.
The negative pressure suction force exerted through the second air passage 48 is caused to act on the outer peripheral edge portion of the stamper 44 via the concave groove 46, so that the outer peripheral portion of the stamper 44 becomes
It is adapted to be adsorbed and held on the surface of the movable side mirror block 30.

On the outer peripheral side of the movable side mirror block 30, a ring-shaped outer peripheral pressing holder 50 is fixedly installed. At the inner peripheral edge portion of the outer peripheral pressing holder 50, the annular claw portion 5 which projects toward the molding cavity 14 and extends radially inward on the surface of the movable mirror block 30.
2 is integrally formed, and by this annular claw portion 52,
The outer peripheral portion of the stamper 44 cooperates with the suction action of the negative pressure air exerted through the second air passage 48,
The movable side stamper mounting surface 53 formed on the surface of the movable side mirror block 30 is held, and when the movable die 12 is matched with the fixed die 10, the annular claw portion 52 is used. The outer peripheral wall of the molding cavity 14 is configured.

Further, on the outside in the radial direction of the stamper 44,
An annular space 54 that continuously extends in the circumferential direction between the movable side mirror block 30 and the outer peripheral pressing holder 50 is formed, and a third air passage 56 penetrating the inside of the outer peripheral pressing holder 50 is provided. The compressed air, which is communicated with the annular space 54 and is supplied through the third air passage 56, passes through the annular space 54 from the annular gap 57 between the stamper 44 and the annular claw portion 52 into the stamper 44. It is designed to be ejected on the surface. Further, the protruding tip of the annular claw portion 52 of the outer peripheral pressing holder 50 is
An annular projection 58 is formed integrally with the stamper 44 so as to project inward in the radial direction. When the disk molded product 16 molded in the molding cavity 14 is cooled and shrunk, the annular projection 58 discs the disk. Since the outer peripheral edge portion of the molded product 16 is locked, a gap that opens outward in the radial direction between the disk molded product 16 and the stamper 44 is likely to occur. ,
By the compressed air supplied from the third air passage 56 and discharged from the annular gap 57 onto the surface of the stamper 44, the releasing force from the stamper 44 is effectively applied to the disk molded product 16. It is supposed to be.

An annular discharge port 60, which extends continuously in the circumferential direction and opens to the movable side cavity forming surface 42, is provided in the gap between the members of the inner circumferential pressing holder 32 and the stationary sleeve 34. , For this annular discharge port 60,
A fourth air passage 62 formed by extending in the axial direction is connected between the members of the inner peripheral pressing holder 32 and the stationary sleeve 34. Then, the compressed air supplied through the fourth air passage 62 is discharged to the movable side cavity forming surface 42 through the annular discharge port 60, so that the disk molded product 16 formed in the molding cavity 14 is discharged. On the other hand, the mold releasing force from the movable side cavity forming surface 42 is exerted.

Furthermore, an annular suction port 64 is formed in the gap between the members of the stationary sleeve 34 and the ejector sleeve 36, and the annular suction port 64 is continuously opened in the movable side cavity forming surface 42 in the circumferential direction. For the suction port 64, the stationary sleeve 34 and the ejector sleeve 3
A fifth air passage 66 formed by axially extending between the six members is connected. Then, the negative pressure suction force exerted through the fifth air passage 66 is passed through the annular suction port 64 to form the disk molded product 1 formed in the molding cavity 14.
The disk molded product 16 is produced by acting on 6
The suction holding force on the movable side cavity forming surface 42 is exerted on the inner peripheral portion of the.

When forming the disk molded product 16 by using the disk molding apparatus having such a structure, as shown in the time chart of FIG. 2, first, the fixed mold 10 and the movable mold 12 are formed. In a state where the mold is opened, the stamper 44 is superposed on the stamper mounting surface 53 of the movable mold 12 to be held by the inner peripheral pressing holder 32 and the outer peripheral pressing holder 50, and the second air passage 48 is supplied with the negative pressure source. Then, the stamper 44 is suction-adsorbed on the stamper mounting surface 53.

After that, the movable mold 12 is fitted to the fixed mold 10 by high-speed and low-speed mold closing operations to form a molding cavity 14 between the mating surfaces, and after further pressure clamping, the molding cavity 14 is formed. On the other hand, by an injection device (not shown), through the sprue bush 22 of the fixed mold 10,
A predetermined resin material is injected and filled.

After injection and filling of the resin material into the molding cavity 14, the movable mold 12 and the fixed mold 10 are clamped and held for a predetermined time, and the filled resin material is cooled and solidified to form a disk molded product. 16 is formed.
Further, during this cooling step, the male cutter sleeve 38 of the movable mold 12 is operated to project so as to be fitted into the center hole of the center bush 20 of the fixed mold 10, so that the disk center hole 68 is formed in the disk molded product 16. Form by punching.

Subsequently, after a lapse of a predetermined cooling time, the mold clamping pressure is released, and the movable mold 12 is opened from the fixed mold 10 by a low speed and a high speed mold opening operation. The ejector pin 40 is operated to project and the sprue portion 70 is projected to be discarded, and the ejector sleeve 36 is operated to project to eject the disk molded product 16
Is pushed out and taken out from the movable mold 12. As a result, the intended disc molded product 16 is obtained.

Here, in the resin material cooling step, after the resin material is cooled and solidified to some extent, in other words, a predetermined delay time is taken from the completion of injection and filling of the resin material, Air passage 26, third air passage 5
The sixth and fourth air passages 62 are each connected to an air pressure source. As a result, the fixed side cavity forming surface 24 is passed from the first air passage 26 through the annular discharge port 28.
By ejecting the compressed air upward, a mold release force from the fixed side cavity forming surface 24 is exerted on the disk molded product 16, and at the same time, an annular shape is generated from the third air passage 56 and the fourth air passage 62. The compressed air is ejected onto the surface of the stamper 44 through the gap 57 and the annular ejection port 60, so that the mold release force from the stamper 44 is exerted on the disk molded product 16.

Furthermore, in such a resin material cooling step, after the resin material is cooled and solidified to some extent,
In other words, the fifth air passage 66 is connected to the negative pressure source from the completion of injection filling of the resin material to the completion of mold opening with a predetermined delay time. As a result, air is sucked from the movable side cavity forming surface 42 through the opening of the annular suction port 64 by the fifth air passage 66, and thus the air suction force is exerted on the disk molded product 16. The disk molded product 1
The inner peripheral portion of 6 is movable with respect to the cavity forming surface 42 on the movable side,
It will be sucked and adsorbed until the mold opening is completed.

Therefore, the third and fourth air passages 56, 6
Before the disk molded product 16 is completely solidified and contracted on the basis of the releasing force by the compressed air supplied through 2,
The disc molding 16 will be advantageously separated from the stamper 44, whereby the disc molding 1
Therefore, the stains and the mist-like molding defects caused by the mold release defect in 6 are effectively prevented.

Moreover, the disc molded product 16 is advantageously released from the fixed mold 10 on the basis of the release force of the compressed air supplied through the first air passage 26, and the fixed mold when the mold is opened. Molding defects in the disk molded product 16 due to defective mold release from the mold 10,
It is advantageously prevented.

Further, the disk molded product 16 has its inner peripheral portion sucked and held by the movable mold 12 by the negative pressure suction force exerted through the fifth air passage 66. It is possible to completely prevent the disc molded product 16 from falling off from the movable mold 12. Further, in particular, before the mold is opened, the disc molded product 16 is subjected to the mold releasing force from the fixed mold 10 based on the mold releasing force by the compressed air supplied through the first air passage 26. Therefore, when the mold is opened, the disk molded product 16 is effectively prevented from adhering to the fixed mold 10 side, and the disk molded product 16 is stably adsorbed and held by the movable mold 12. Become.

In short, according to the above-mentioned method, by separating the disk molded product 16 from the stamper 44 before the disk molded product 16 is completely solidified and contracted,
It is possible to prevent the molding error of the disk molded product 16 caused by the mold release failure and to prevent the disk molded product 16 from falling off from the movable mold 12 in the mold opening process, thereby providing good quality. It is possible to stably form the disc molded article of 1) with excellent manufacturability.

As shown in the time chart of FIG. 2, the first, third, fourth and fifth air passages 26,
Connection of 56, 62, 66 to air pressure source or negative pressure source is
For example, first, the first air passage 26 is connected to the air pressure source, then the fifth air passage 66 is connected to the negative pressure source, and then the third and fourth air passages 56, 62 are connected to the air pressure source. It is desirable that the disk molded product 16
The mold release from the fixed side cavity forming surface 24 and the stamper 44 and the prevention of the disc molded product 16 from coming off from the movable mold 12 can be achieved more effectively and stably.

The embodiments of the present invention have been described in detail above, but these are literal examples and the present invention should not be construed as being limited to such specific examples.

For example, the connection order of the first, third, fourth and fifth air passages 26, 56, 62, 66 to the air pressure source or the negative pressure source can be changed as appropriate, and the above-mentioned embodiment can be changed. It is not limited to ones.

In the cooling step, it is not always necessary to discharge the compressed air onto the fixed side cavity forming surface 24 and the movable side cavity forming surface 42.

Alternatively, the movable side cavity forming surface 42
It is also possible to secure the mold releasability of the disk molded product 16 from the stamper 44 by temporarily or discontinuously discharging the compressed air upward.

Further, the negative pressure air passage 66 is also used as a compressed air passage, the negative pressure suction through the negative pressure air passage 66 is temporarily stopped, and the compressed air is discharged through the negative pressure air passage 66. It is also possible to perform temporarily in the middle of the cooling step, temporarily after the cooling step is completed and before the mold opening, or temporarily when the ejector advances after the mold opening is completed, Thereby, the releasability of the disk molded product from the cavity forming surface on the movable side is advantageously improved without complicating the mold structure.

Further, the holding structure for the movable die of the stamper is not limited to the exemplified one, and various known holding structures can be adopted.

Although not listed one by one, the present invention
The present invention can be carried out in a mode in which various changes, modifications, improvements, etc. are added based on the knowledge of a person skilled in the art, and such a mode does not depart from the gist of the present invention.
Both are included within the scope of the present invention,
Needless to say.

[0053]

As is apparent from the above description, in the disk mold having the structure according to the present invention, the disk mold is sucked by the negative pressure air on the cavity forming surface of the movable mold on which the stamper is mounted. By adopting a new structure that allows adsorption, it is possible to prevent the disc molded product from falling from the movable mold by adsorbing and holding the disc molded product on the movable mold side during mold opening operation. Therefore, it is possible to improve the stability of the disk molding.

Further, according to the method of the present invention, with respect to the disk molded product, a releasing force from the fixed mold by compressed air,
Due to the suction and suction force of the negative pressure on the movable mold, the disc molded product is prevented from falling off from the movable mold in the mold opening step, and stable disc moldability can be exhibited.

[Brief description of drawings]

FIG. 1 is an explanatory view schematically showing a cross section of a main part of a disk molding apparatus using a disk molding die as an embodiment of the present invention.

FIG. 2 is a time chart for explaining one specific example of the disk molding method according to the present invention using the disk molding apparatus shown in FIG.

[Explanation of symbols]

10 Fixed mold 12 movable mold 14 Molding cavity 16 Disc molded products 24 Fixed side cavity forming surface 26 First air passage 42 Movable side cavity forming surface 44 Stamper 48 Second air passage 56 Third Air Passage 62 Fourth Air Passage 66 Fifth Air Passage

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI G11B 7/26 521 G11B 7/26 521 // B29L 17:00 B29L 17:00 (58) Fields investigated (Int.Cl. ⁷ , DB name) B29C 45/40 B29C 33/18 B29C 33/46 B29C 45/76 G11B 3/70 G11B 7/26 521

Claims (2)

(57) [Claims] 1. A cylindrical inner pressing holder for pressing an inner peripheral edge of a stamper, which is provided so as to penetrate through a central portion of a movable side mirror block in a mold matching direction, and a center hole of the inner pressing holder. A stationary sleeve that is inserted and fixedly disposed, an ejector sleeve that is axially movable in the central hole of the stationary sleeve, and is axially movable in the central hole of the ejector sleeve. The movable side mirror block is provided with a male cutter sleeve movably inserted therein, and the movable side cavity block has a cavity forming surface on the movable side by the surface of the movable side mirror block and the respective axial end surfaces of the inner peripheral pressing holder, the stationary sleeve and the ejector sleeve. Using a movable mold formed in cooperation with each other, a stamper is attached to the cavity forming surface of the movable mold, and the space between the movable mold and the fixed mold is matched with each other. By molding the formed molding cavity with a resin material, when molding the disk on which the information of the stamper is transferred, the cooling is performed from the middle of the cooling process of the movable mold before the mold is opened from the fixed mold. After the process is completed, compressed air is discharged onto the cavity forming surface of the fixed mold to separate the disk molded product from the cavity forming surface of the fixed mold, and at the same time, from the fixed mold of the movable mold. In the mold opening step, before the mold opening, the negative pressure air passage is provided between the stationary sleeve and the ejector sleeve of the movable mold so as to open to the cavity forming surface with respect to the disk molded product. The inner peripheral pressing holder of the movable mold is attached to the disk molded product under a state in which a negative pressure suction force is exerted on the cavity forming surface of the movable mold. It is characterized in that the compressed air is discharged from a first compressed air passage provided so as to open to the cavity forming surface from between the stationary sleeve and the mold release force, and then the mold is opened. Disc molding method. 2. A second compressed air passage for ejecting compressed air onto the cavity forming surface of the movable mold to exert a mold releasing force from the stamper on the disk molded product, the outer peripheral side of the stamper. 2. The disk molding is further provided with a compressed air to be discharged from the second compressed air passage so as to exert a releasing force. Disc molding method.