JP2965898B2 - Disk molding die - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk molding die for molding a disk. More specifically, the present invention relates to a structure for taking out a disk as a disk-shaped recording medium such as a video disk and an audio disk.

[0002]

2. Description of the Related Art As a disk molding die of this kind,
JP-A-5-285997 can be mentioned.

In this disk molding die, the outer periphery of the stamper is held on the other mold plate by the outer peripheral holder, and at the same time, one mold plate is closed by the outer peripheral holder to form a disk-shaped cavity. I have. In this type of mold, the method of removing the disk is to separate the stamper from the disk when opening the mold, and then to separate the mirror surface holding the disk.

[0004]

In the above-described disk molding die, when the stamper and the disk are separated from each other or when the disk is separated from the mirror surface, the mirror surface of the fixed-side mold plate and the mirror surface of the movable-side mold plate are removed. The disk is pulled out or pushed out from the ring-shaped outer peripheral holder that surrounds the outer periphery of the portion and contacts the outer peripheral edge of the disk. As a result, the disk bends and deforms from the outer peripheral portion due to the friction between the outer peripheral edge of the disk and the outer peripheral holder, resulting in pit displacement and the like. Further, it has been found that when the outer peripheral edge of the disk is peeled off, resin powder is generated from the outer peripheral edge of the disk, and there is a problem that the product accuracy is reduced.

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above problems, and has as its object to provide a disk take-out structure for forming a disk in which bending deformation of the disk is prevented and product accuracy is improved. .

[0006]

Means for Solving the Problems A disk molding die according to the present invention for solving the above-mentioned problems employs the following means.

In other words, in the first aspect, the cavity is constituted by the mirror surface of the fixed mold plate, the mirror surface of the movable mold plate, and the inner peripheral surface of the ring-shaped outer ring surrounding the outer periphery of both mirror surfaces.
The outer ring and the mirror surface of either template are slidable by a slide mechanism in the direction of intersection of the parting surface,
In a disk molding die configured to release the abutment of the outer ring from the outer edge of the disk, the outer ring has tapered guide surfaces on its inner circumference and the outer circumference of the mirror portion of any of the template plates, An extension is provided on the tapered guide surface of the outer ring on the parting surface side to form an inner peripheral surface that forms the outer periphery of the cavity, and the outer ring is slid by a slide mechanism to support the sliding body of the slide mechanism with a ball bearing. It is characterized by doing. By the contact between the ball bearing support structure and the tapered surface, the outer peripheral ring is centered on the slide, and the outer peripheral surface is formed by the extension.

According to a second aspect of the present invention, in the disk molding die according to the first aspect, a gas vent is opened in the extension. Gas is vented using the extension.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a disk molding die according to the present invention will be described below with reference to the drawings.

The steps of this embodiment are shown in FIGS. FIG. 1 shows a molding process, in which a fixed side template 1 is shown.
The movable mold plate 2 is clamped.

The movable mold plate 2 is fixed to a guide rod 3 that penetrates the fixed mold plate 1, and is configured to approach and separate from the fixed mold plate 1 as the guide rod 3 advances and retreats. An injection cylinder (not shown) is arranged on the fixed mold plate 1. On the surface of the fixed mold plate 1 facing the movable mold plate 2, a mirror surface portion 5 equipped with a stamper 4 as a base material for transferring a hit pattern as an information track surface is attached. . On the surface of the movable mold plate 2 facing the fixed mold plate 1, a mirror surface portion 7 forming a cavity 6 between the movable mold plate 2 and the mirror surface portion 5 of the fixed mold plate 1 via a stamper 4 is attached. I have.

Further, a ring-shaped outer peripheral ring 8 is provided outside the mirror surfaces 5 of the fixed mold 1 and the mirror 7 of the movable mold 2. The outer peripheral ring 8 defines an outer peripheral portion of the cavity 6 by an inner peripheral surface thereof, and is assembled to a mirror surface portion 7 of the movable mold plate 2 so as to be slidable in the axial direction of the cavity 6.

In the molding step shown in FIG. 1, a molten resin is injected into the cavity 6, the fixed mold plate 1 and the movable mold plate 2 are compression-clamped. Is transferred. Then, gate cutting of the center hole of the disk 9 and the like is performed. Note that the outer peripheral edge of the solidified or semi-solidified disk 9 is in contact with the inner peripheral surface 10 of the outer peripheral holder 8.

FIG. 2 shows a mold opening step following the molding step of FIG. 1, in which the movable mold plate 2 is separated from the fixed mold plate 1 and opened.

In the mold opening process, the stamper 4 is moved to the fixed side mold plate 1.
The other surface 9b of the disk is held by the mirror surface 7 of the movable mold plate 2, and the disk surface 9a is peeled off from the stamper 4. At this time, the outer peripheral ring 8 moves integrally with the mirror surface portion 7 of the movable mold plate 2 and separates from the mirror surface portion 5 of the fixed mold plate 1 while keeping the outer ring 8 in contact with the outer peripheral edge 9 c of the disk 9. Therefore, since the outer peripheral edge 9c of the disk 9 is protected by being surrounded by the inner peripheral surface 10 of the outer ring 8, bending deformation of the disk 9 when peeling from the stamper 4 is prevented.

FIG. 3 shows an outer ring sliding step following the mold opening step of FIG. 2, in which the outer ring 8 slides with respect to the mirror surface portion 7 of the movable mold plate 2.

In the outer peripheral holder sliding step, the outer peripheral ring 8 slides in the axial direction of the cavity 6 (disc 9), and the abutment of the outer peripheral ring 8 on the outer peripheral edge 9c of the disk 9 is released. At this time, since the sliding direction of the outer ring 8 is the retreating direction, which is the axial direction of the disk 9, the friction between the outer ring 8 and the outer edge 9c of the disk 9 is reduced. That is, since the outer peripheral ring 8 retreats while the disk other surface 9b is held by the mirror surface portion 7, the outer peripheral ring 8 slides in parallel along the thick surface of the outer peripheral edge 9c. Therefore, the sliding of the outer peripheral ring 8 is smoothly performed,
The generation of resin powder due to the curvature of the outer peripheral edge 9c of the disk 9 is also prevented.

FIG. 4 shows a disk projecting step following the outer ring slide step of FIG. 3, in which the disk 9 is projected from the mirror surface portion 7 of the movable mold plate 2.

In the disk projecting step shown in FIG. 4, the disk 9 is projected by air pressure, pin pressure or the like, and the disk 9 is peeled off from the mirror surface portion 7 of the movable mold plate 2. At this time,
Since the contact of the outer ring 8 with the outer edge 9c of the disk 9 is released, no friction occurs between the inner surface 10 of the outer ring 8 and the outer edge 9c of the disk 9.

According to this embodiment, as described above, the bending deformation of the disk 9 and the generation of resin powder from the outer peripheral edge 9c of the disk 9 are prevented, and the product accuracy is improved. The disk 9 protruded in the disk protruding step shown in FIG.
It is collected by a suitable means such as a robot arm.

FIGS. 5 to 7 show specific examples of the structure around the outer peripheral ring 8 described above.

In this specific structural example, a slide bolt 20 is fixed to the outer peripheral ring 8 as a slide mechanism, and the slide bolt 20 is inserted through a slide 21 to move the movable mold plate 2.
Through the sliding hole 22 of the mirror surface portion 7 of the above. The sliding body 21 is
It is preferable that the position is regulated via the ball bearing 23 and the slide bearing is supported. In addition, a piston 25 that slides in the cylinder chamber 24 is provided at a base end of the slide bolt 20 which protrudes into a cylinder chamber 24 provided in the movable mold plate 2. An air pressure supply passage 26 communicates with an end of the cylinder chamber 24. Although not shown, a plurality of the slide mechanisms are arranged at predetermined positions on the projection surface of the movable mold plate 2.

Further, the outer peripheral ring 8 has a structure in which abutting portions with the mirror surface portion 5 are formed on the tapered surfaces 11 and 12 so that the mirror surface portion 5 can be centered from the outer periphery. Outer ring 8
Is provided with an extension 13 from the tapered surface 11 to the partitioning side, and the extension 13 has an inner peripheral surface 10 forming an outer periphery of the cavity.
Is formed in a ring shape. The extension 13 has a gas vent 14
Can be opened.

Further, a stopper member 30 is provided on the mirror surface portion 5 of the fixed-side mold plate 1, preferably at a position facing the slide bolt 10. A plurality of the stopper members 30 are arranged at predetermined positions on the outer periphery of the mirror surface portion 7, are formed in, for example, a cylindrical body, and are screwed to the fixed mold plate 1 via bolts 31. The stopper member 30 slightly protrudes from the surface of the mirror portion 7 according to the thickness of the stamper 4. The height of the stopper 30 can be adjusted by screwing the stopper 30 in accordance with the thickness of the stamper.

Further, in the mirror surface portion 5 of the fixed side template 1, a vacuum hole 32 is formed in a ring shape on the outer peripheral side, and the vacuum hole 33 is formed in a ring shape around the center cup 33 on the inner peripheral side. The vacuum holes 32 and 33 are arranged outside the pattern surface of the disk, and hold the inner and outer peripheries of the stamper 4 by suction. The holding of the stamper 4 is carried out by holding the stamper in a jig in a pan shape, bringing the jig into engagement with the center cup 33 and positioning the stamper 4 close to the vacuum holes 32, 33,
It is set by sucking through the vacuum holes 32 and 33. The outer peripheral edge of the stamper 4 is separated from the stopper member 30 in consideration of the amount of expansion and contraction.

According to this specific structural example, air pressure is supplied from the air pressure supply passage 26, the piston 25 is slid by air pressure, and the outer ring 8 can be projected to a position where it comes into contact with the outer peripheral edge of the disk 9. . The outer peripheral ring 8 abuts against the stopper member 30 and is closed, but the outer ring 8 does not abut the stamper 4 because the stamper 4 is held by the vacuum holes 32 and 33. In such a state, the molten resin is injected into the cavity 6 to form the disk 9. The stamper 4 repeatedly expands and contracts with the filling and solidification of the molten resin. However, the stamper 4 is not fixed in position by the outer peripheral ring 8 and free escape is allowed.

During the mold opening process, the outer peripheral ring 8 continuously supplies the air pressure from the intake pressure supply passage 26, so that the outer peripheral ring 8 is separated from the stopper member 30 in synchronization with the retreat of the movable mold plate 2, and the other surface of the disk. While the disk 9b and the disk outer peripheral edge 9c are held, only the disk surface 9a is forcibly peeled off from the stamper 5 of the fixed mirror surface portion 7.

Next, the supply of air pressure from the air pressure supply passage 26 is released, the piston 25 is retracted, and the outer peripheral ring 8
Can be retracted to a position where the contact with the outer peripheral edge 9c of the disk 9 is released. Since the outer peripheral ring 8 retreats to the movable side while maintaining the close contact of the other surface 9b of the disk with the mirror part 5 on the movable side, the outer periphery of the disk 9 is maintained.

According to this embodiment, since the slide bolt 20 is supported by the ball bearing 23, the outer ring 8 is positioned and the slide is smooth. In addition, the centering of the slide of the outer peripheral ring 8 is precisely performed by the support structure using the ball bearing 23 and the abutment of the tapered surfaces 11 and 12. In addition, the abutment of the tapered surfaces 11 and 12 attenuates the friction of each abutting portion, thereby preventing the generation of metal powder.

As described above, in addition to the illustrated embodiment, it is possible to adopt an embodiment in which the fixed side and the movable side are reversed.

When the cylinder mechanism and the ejector mechanism are
The same releasing effect can be obtained even if the outer peripheral ring 8 is relatively retracted by moving the mirror surface portion forward.

In the above-described embodiment, the outer peripheral ring 8 is opened after the mold is opened.
Has been described, but the outer peripheral ring 8 can be retracted at least when the disk surface 9a is peeled off.

[0033]

As described above, the disk molding die according to the present invention is configured such that the outer peripheral ring and the mirror portion of any one of the template plates can be slid in the direction intersecting the parting surface after one surface of the disk is peeled off. In addition to being able to peel off only the outer peripheral edge of the disk while maintaining the shape of the disk, the sliding body of the slide mechanism is supported by ball bearings, and at the same time, the inside of the outer peripheral ring abuts on a tapered surface to extend the cavities. Since the outer peripheral surface is formed, the outer ring can be precisely centered from the outer periphery of the mirror surface, and the abutment of the tapered surface attenuates the friction of the extended portion to accurately define the outer peripheral surface of the cavity. Defects at the time of disk separation such as deformation at the outer periphery and generation of resin powder or metal powder could be eliminated.

[Brief description of the drawings]

FIG. 1 is a schematic plan view showing a molding step of an embodiment of a disk molding die according to the present invention.

FIG. 2 is a schematic plan view showing a mold opening process of an embodiment of the disk molding die according to the present invention.

FIG. 3 is a schematic plan view showing an outer ring sliding step of one embodiment of the disk molding die according to the present invention.

FIG. 4 is a schematic plan view showing a disk projecting step of one embodiment of the disk molding die according to the present invention.

FIG. 5 is an enlarged cross-sectional view showing a specific structure example of a main part of FIG. 1 and relates to a molding step.

FIG. 6 is an enlarged cross-sectional view showing a specific example of a structure of a main part of FIG. 1 and relates to a mold opening step.

FIG. 7 is an enlarged cross-sectional view showing a specific structure example of a main part of FIG. 1 and relates to an outer ring sliding step.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fixed-side mold plate 2 Movable-side mold plate 4 Stamper 5 Mirror surface part (of fixed-side mold plate) 7 Mirror surface portion (of movable-side mold plate) 8 Outer ring 9 Disk 11 and 12 Tapered surface 14 Gas vent 20 Sliding bolt 30 Stopper Member 31 Bolt 32, 33 Vacuum hole

Claims (2)

(57) [Claims] 1. A cavity is formed by a mirror surface portion of a fixed-side mold plate, a mirror surface portion of a movable-side mold plate, and an inner peripheral surface of a ring-shaped outer peripheral ring surrounding the outer periphery of both mirror surface portions. In a disk molding die in which the mirror surface of the template is slidable by a slide mechanism in a direction intersecting the parting surface and the outer peripheral ring is released from contact with the outer peripheral edge of the disk, the outer peripheral ring may be any one of the inner peripheral surface and the inner peripheral surface. A taper guide surface is provided on the outer periphery of the mirror surface portion of the mold plate, and an extension portion is provided on the parting surface side of the taper guide surface of the outer peripheral ring to form an inner peripheral surface forming the outer periphery of the cavity, and A mold for molding a disk, wherein an outer peripheral ring is slid by a slide mechanism and a slide body of the slide mechanism is supported by a ball bearing. 2. The disk molding die according to claim 1, wherein a gas vent is opened in the extension.