JPH07156212A - Mold and molding method - Google Patents

Abstract

PURPOSE:To fast stick a base plate to a face opposite to a stamper by providing slits on inner and outer peripheries of a component member of a mold so as to vacuum with suction from the slits. CONSTITUTION:A mirror face is formed opposite a stamper clamping plate 1. The mirror face consists of a centering material 9, a mirror face plate 10, and an outer peripheral member 11. An air slit B is provided in between the centering material 9 and the mirror face plate 10. Other air slit C is provided in between the mirror face plate 10 and the outer peripheral member 11. Vacuum suction is performed from the air slits B and C. The vacuum suction is started at an optional time during a period from a start of mold clamping to a start of mold opening, and the suction is continued until a base plate 16 is taken out. Thus, a plurality of vacuum suction openings are provided within the range of the base plate shape at the mirror face side opposite to the stamper clamping side, so that the base plate 16 can be stuck fast to the mirror face.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molding die and a molding method, and more particularly to a molding die and a molding method in injection molding of a substrate for an optical disk.

[0002]

2. Description of the Related Art As a known document describing a conventional molding die for an optical disc substrate, there is, for example, "Optical Disc Molding Die" disclosed in JP-A-1-176536. In this publication, an air blow outlet is provided in the outer peripheral portion of the mirror block where information on the disc is not recorded, and air is blown from the outer periphery. Further, in Japanese Unexamined Patent Publication No. 1-264822, “Molding Method for Preformatted Substrate and Mold Used Therefor”, a spring for pressing in the mold opening direction is inserted in the outer peripheral ring, and the outer peripheral ring is fixed to the fixed side in accordance with the mold opening. The substrate is extruded and the substrate is peeled from the stamper.

Further, the "method of releasing a flat-shaped product" disclosed in Japanese Unexamined Patent Publication No. 4-93208 is a method in which vacuum suction is performed from an air blow slit on a surface opposite to a stamper, and then air is blown to peel off a substrate. is there. In addition, JP-A-2-
In the "optical disc substrate and its manufacturing method" of Japanese Patent No. 243317, a step is provided so as to be caught when the resin is cooled and contracted in the inner surface and the outer peripheral surface of the stamper, and when the mold is opened, the surface is attached to the stamper opposed surface. It is something to peel off. Further, the "recording carrier molding die" disclosed in Japanese Patent Publication No. 3-75333 is to eject the outer stamper retainer forming the outer diameter at the same time as the inner stamper retainer.

[0004]

As described above, as a conventional molding die, as a method of bringing the substrate into close contact with the surface facing the stamper and peeling the substrate from the stamper, the publications of the above publications, etc. are disclosed. is there. In the above-mentioned publication, the step portion is made harder to be contracted than the resin is shrunk, but if the step portion is large, it affects the subsequent steps, and conversely if it is small, the clinging is reduced. Further, in the above-mentioned publication, vacuum suction is performed by air blow, but only the inner peripheral portion is used, and uniform in-plane contact cannot be expected.

Further, as a method of separating the substrate from the stamper by moving the outer peripheral ring, there are the above-mentioned publications and the above-mentioned publications. In the case of the above-mentioned publication, the cut punch punched out with the inner diameter does not move when the die is opened, and therefore acts to pull the substrate toward the stamper side. In the above-mentioned publication, the inner and outer peripheral surfaces are projected, but the middle peripheral portion may remain warped. Also,
When the outer peripheral ring is on the stamper surface as in the above publications, the air blow for peeling stays in the outer peripheral ring portion, which causes uneven peeling of the substrate.

The present invention has been made in view of such a situation, and a slit is provided on the inner and outer circumferences of the constituent members of the molding die, and vacuum suction is performed from there, so that the surface of the substrate that reliably faces the stamper is surely faced. In addition, since the inner and outer cut punches and outer peripheral rings are provided on the surface facing the stamper, when the substrate is pulled in the same direction and at the same time it is brought into close contact with the surface, Can be peeled off, the air blow can be easily removed, and the peeling of the substrate can be made uniform.Furthermore, by using a mold, make sure that the substrate is firmly attached to the surface facing the stamper at the start of mold opening, It is an object of the present invention to provide a molding die and a molding method capable of uniformly peeling and preventing bit shift and the like.

[0007]

In order to achieve the above object, the present invention provides: (1) In injection molding of an optical disk,
Providing a plurality of vacuum suction ports within the substrate shape range on the mirror surface side opposite to the side on which the stamper is installed, and further, (2)
In order to provide the vacuum suction port, the mirror plate has a double structure, or (3) the cut punch forming the inner diameter hole of the substrate and the cavilling forming the outer diameter are provided on the side where the stamper is installed. Provided on the corresponding surface, or
(4) The cavity for molding the outer diameter of the molded substrate is movable in order to follow mold clamping, injection compression, etc., and the movement of the outer peripheral cavity is held at the position at the start of mold opening, or On the contrary, having a driving mechanism that allows the outer peripheral cavilling to move so as to be pushed back into the mold, or
(5) By extending the parting surface of the mold with the top surface of the stamper,
It is provided so as to be parallel to the stamper, or
(6) When the mold is opened, the molded substrate is held on the surface facing the stamper, and the molded substrate is taken out from the surface facing the stamper with a take-out machine, or (7) air blow blowing for separating the stamper and the substrate. There is one characterized in that it has a mechanism for projecting the substrate from the stamper side in conjunction therewith.

[0008]

A mirror surface is formed so as to face the stamper mounting plate, and the mirror surface is composed of a centering material, a mirror surface plate and an outer peripheral member. An air slit is provided between the centering member and the mirror plate, and another air slit is provided between the mirror plate and the outer peripheral member. Vacuum suction is performed from these air slits. The vacuum suction starts from an arbitrary time between the start of mold closing and the start of mold opening, and suction is performed until the substrate is taken out. Thus, by providing a plurality of vacuum suction ports within the substrate shape range on the mirror surface side facing the stamper mounting side, the substrate can be brought into close contact with the mirror surface.

[0009]

Embodiments will be described below with reference to the drawings. FIG. 1 is a configuration diagram for explaining an embodiment of a molding die according to the present invention, in which 1 is a stamper mounting plate, 2 is a spool, 3 is a peeling protrusion, 4 is a stamper holder, and 5 is a counter. Punch, 6 is a counter stopper, 7 is a cut punch, 8 is a product protrusion, 9 is a centering material, 10 is a mirror surface plate,
Reference numeral 11 is an outer peripheral member, 12 is a cavitation, 13 is a cavitation stopper, 14 is a stopper holder, 15 is a stamper, and 16 is a cavity (substrate).

The centering member 9, the mirror surface plate 10 and the outer peripheral member 11 form a mirror surface facing the stamper mounting plate 1. Centering material 9
And air gaps B and C are provided between the mirror plate 10 and the mirror plate 10 and the outer peripheral member 11, respectively, and vacuum suction is performed from there. Vacuum suction is started from an arbitrary time between the start of mold closing and the start of mold opening, and suction is performed until the substrate is taken out. The cut punch 7 and the cavity ring 12 are on the side facing the stamper 15, and the cavity ring 12 is pushed upward by a spring (not shown) or the like. The cavitation stopper 13 and the stopper holder 14 are located outside the cavitation 12, and determine the stroke of the cavitation 12. A counter punch 5 is provided on the stamper mounting plate 1 side, and air can be introduced from A to move the counter punch 5 downward. The counter stopper 6 is located outside the counter punch 5 and determines the stroke of the counter punch 5.

The resin is injected from the molding machine to fill the cavity 16 with the resin, and the mold opens when the pressure becomes higher than the mold clamping force. However, since the cavity ring 12 moves according to the opening of the cavity 16, resin does not leak from the cavity 16. When cooling is completed and the cavity 12 does not hit the cavity stopper 13 at the start of the mold,
The cavilling 12 moves upward in accordance with the movement of the mold opening. At that time, the counter punch 5 is pushed out by air (downward in the figure) at the start of mold opening, and the cavilling 12 is pressed.
Prevent the movement of. By adjusting the air pressure supplied to the counter punch 5, it is possible to hold the movement of the cavity ring 12 at the position at the start of mold opening, or reversely push it back.

The counter punch 5 is inserted and the cavilling 1
By extruding 2, the substrate that can be the cavity 16
Preventing the mirror plate 10 and the outer peripheral member 11 from floating,
It can be kept in close contact with the mirror surface.

From the slit D, the stamper 15 and the substrate 16
Air for releasing the mold (same as the cavity) is blown out at the same time when the mold is opened. Since the parting line of the mold (the mating surface of the mold, PL in the figure) is extended to the same height as the stamper, the air blow does not stay after the substrate 16 and the stamper 15 are peeled off, It flows out of the mold. Also, in conjunction with the air blow, the peeling protrusion 3 is projected,
Uniformly spread the air blow.

As described above, the substrate 16 is brought into close contact with the centering member 9, the mirror surface plate 10 and the outer peripheral member 11 by vacuum suction from the slits B and C immediately after the mold opening is started. The movement of the cavilling 12 is stopped by the counter punch 5. The air blow from the slit D separates the stamper 15 and the substrate 16. When the mold opening is completed and the take-out machine (not shown) picks up the substrate 16, air is blown from the slit B to separate the mirror surface plate 10 and the substrate 16. At the same time, the product projecting portion 8 is driven by air to mechanically project the substrate 16.

[0015]

As is apparent from the above description, the present invention has the following effects. (1) Effect corresponding to claim 1: Since a plurality of vacuum suction ports are provided in the substrate shape range on the mirror surface side facing the side on which the stamper is installed, the substrate is vacuum sucked, so that the substrate is brought into close contact with the mirror surface. You can (2) Effect corresponding to claim 2: Since the mirror surface plate has a double structure to provide the vacuum suction port, a mirror surface having the vacuum suction port can be easily formed. (3) Effect corresponding to claim 3: Since the cut punch that forms the inner diameter hole of the substrate and the cavity ring that forms the outer shape are provided on the surface side corresponding to the side on which the stamper is installed, the substrate closely attached to the mirror surface is provided. Since it supports the inner and outer circumferences, it can be held securely. (4) Effect corresponding to claim 4: The cavity ring for molding the outer diameter of the molded substrate is movable, and the movement of the outer peripheral cavity is held at the position when the mold opening is started, or conversely, the outer peripheral cavity is held. Since the drive mechanism that moves the ring so that it is pushed back into the mold is provided, the movement of the cavitation ring that determines the outer diameter can be retained when the die is opened, and thus the peeling of the substrate due to the movement of the cavitation ring can be prevented. (5) Effect corresponding to claim 5: Since the parting surface of the die is provided so as to be parallel to the stamper by extension of the upper surface of the stamper, the air blow for separating the stamper and the substrate comes out of the die without resistance. The substrate does not warp due to air blow retention. (6) Effect corresponding to claim 6: When the mold is opened, the molded substrate is held on the surface facing the stamper, and the molded substrate is taken out from the surface facing the stamper by the unloader. It can be peeled in parallel with the stamper, and the pit shift of the substrate does not occur. (7) Since the mechanism for projecting the substrate from the stamper side is provided in conjunction with the air blow blowing for separating the stamper and the substrate, the air blow blowing slits can be evenly opened, and the air blow can be blown uniformly. .

[Brief description of drawings]

FIG. 1 is a configuration diagram for explaining an embodiment of a molding die according to the present invention.

[Explanation of symbols]

1 ... Stamper mounting plate, 2 ... Spool, 3 ... Peeling protrusion,
4 ... Stamper holder, 5 ... Counter punch, 6 ... Counter stopper, 7 ... Cut punch, 8 ... Product protrusion, 9 ...
Centering material, 10 ... Mirror plate, 11 ... Peripheral member, 12 ... Caviring, 13 ... Caviring stopper, 14 ... Stopper holder, 15 ... Stamper, 16 ... Cavity (substrate).

Claims (6)

[Claims] 1. A molding die for injection molding of an optical disc, wherein a plurality of vacuum suction ports are provided within a substrate shape range on a mirror surface side opposite to a side on which a stamper is installed. 2. The molding die according to claim 1, wherein the mirror plate has a double structure in order to provide the vacuum suction port. 3. A molding die, wherein a cut punch for forming an inner diameter hole of a substrate and a cavitation for forming an outer diameter are provided on a surface side corresponding to a side on which a stamper is installed. 4. The cavity for molding the outer diameter of the molded substrate is movable in order to follow mold clamping, injection compression and the like,
A molding die having a drive mechanism capable of holding the movement of the outer peripheral cavitation at the position when the die opening is started at the time of starting the die opening, or conversely, moving the outer peripheral cavity ring so as to be pushed back to the die. 5. A molding die, wherein a parting surface of the die is provided so as to be parallel to the stamper by extending the upper surface of the stamper. 6. A molding method characterized in that, when the mold is opened, the molded substrate is held on the surface facing the stamper, and the molded substrate is taken out from the surface facing the stamper with a take-out machine.