JP2001322148A - Mold for molding disk, laminated substrate, and its production method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the generation of defective lamination by the mutual interference of cut burrs when two disk substrates are bonded. SOLUTION: A laminated substrate is produced by bonding the disk substrates. A fixed side mirror block 18, a stamper 32 for forming information surfaces which face each other when the disk substrates are bonded, a fixed side cutter for forming a cut hole 41 by the first and second tip faces S14, S15, a movable side mirror block 37, and a movable side cutter which applies boring processing to the original mold of the disk substrate are provided. The first tip face S14 is set at a forward position separated by a prescribed distance H from the surface S3 of the stamper 32 and forms steps on the surfaces of the disk substrates along with molding. The tips of the cut burrs formed in the inner circumferential fringes of the holes of the disk substrates are not protruded from the information surfaces of the disk substrates.

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, a bonded substrate, and a method of manufacturing the same.

[0002]

2. Description of the Related Art Conventionally, when manufacturing a DVD substrate, a disk substrate is formed by an injection molding machine, and the disk substrates are attached to each other so as to face each other. The disk molding die used for molding is composed of a fixed die and a movable die. The movable die is brought into contact with and separated from the fixed die by a die clamping device, and the die is closed, the die is closed and the die is opened. It is supposed to do. Further, before performing the mold opening, an in-mold gate cutting mechanism is provided in the disc molding die in order to perform a punching process on the original disc substrate.

FIG. 2 is a cross-sectional view of a main part of a conventional disk molding die, and FIG. 3 is a cross-sectional view of a main part of a disk substrate formed by the conventional disk molding die.

In FIG. 1, reference numeral 11 denotes a fixed die, and 12 denotes a movable die which is disposed so as to be able to contact and separate from the fixed die 11, and a disk is formed by the fixed die 11 and the movable die 12. A mold is formed, and a cavity space 17 is formed between the two.

The fixed mold 11 has a sprue 16 in the center.
, A sleeve-shaped fixed bush (female cutter) 19 disposed on the outer periphery of the sprue bush 15, and a sleeve-shaped bush (female cutter) 19 disposed on the outer periphery of the fixed bush 19. Inner stamper holder 3
3, and a fixed mirror block 18 disposed on the outer periphery of the inner stamper holder 33 and attached to a fixed base plate (not shown).

Further, the movable mold 12 is provided with a sprue cut punch (male cutter) 36 which is disposed to face the sprue bush 15, and the fixed side mirror block 18 A movable mirror block 37 attached to a movable base plate (not shown), and a radial outside of the movable mirror block 37;
It has a not-shown cavity forming the outer peripheral surface of the cavity space 17.

The resin injected from an injection nozzle (not shown) is filled (balanced) into the cavity space 17 through the sprue 16 and solidified in the cavity space 17 to become a prototype of the disk substrate 31.

[0008] One surface S1 of the disk substrate 31 is used as an information surface, and digital information is written on the surface S1. Therefore, a stamper 32 is provided in the fixed mold 11 so as to face the cavity space 17, and when the disk substrate 31 is formed, the stamper 32 is formed.
As a result, irregularities corresponding to the digital information are formed on the surface S1 of the disk substrate 31.

In order to attach the stamper 32 to the fixed-side mirror block 18, an inner stamper holder 33 is fixed to the fixed-side mirror block 18, and a holding portion 3 formed on the outer peripheral edge of the inner stamper holder 33.
4 presses the inner peripheral edge of the stamper 32 against the fixed-side mirror block 18.

The holding portion 34 is formed by projecting from the tip end surface S2 of the inner stamper holder 33 toward the movable mold 12, and when the inner stamper holder 33 is fixed to the fixed side mirror block 18, the holding portion 34 is formed. The tip surface S2 is set such that the tip surface S2 of the inner stamper holder 33 and the surface S3 of the stamper 32 facing the cavity space 17 are placed on the same plane.

The fixed side bush 19 and the sprue cut punch 36 constitute an in-mold gate cut mechanism for making a hole in the original disk substrate 31 formed in the cavity space 17. And
A first tip surface S4 is formed at a tip of the fixed side bush 19, and a second tip surface S5 is formed at a tip of the sprue bush 15, and the first tip surface S4 is a tip surface of an inner stamper holder 33. S2 is placed on the same plane as the first end surface S5, and the second end surface S5 is set rearward (to the right in the figure) of the first end surface S4.
The cut hole 41 is formed by the step between S5.

Therefore, after the cavity space 17 is filled with the resin, the sprue cut punch 36 is advanced (moved to the right in the drawing), and the tip of the sprue cut punch 36 enters the cut hole 41. A hole is formed in the original shape of the disk substrate 31 formed in the space 17. In this manner, the original pattern of the disk substrate 31 can be subjected to drilling.

[0013]

However, in the conventional disk molding die, when the tip of the sprue cut punch 36 enters the cut hole 41,
The resin may enter between the fixed side bush 19 and the sprue cut punch 36, and a cut burr 43 as shown in FIG. 3 may be formed on the inner peripheral edge of the hole on the surface S1 side of the disk substrate 31.

When the two disc substrates 31 are bonded together with the surface S1 on which the cut burrs 43 are formed facing each other, the cut burrs 43 interfere with each other and are bonded (beam).
Misalignment may occur, or the cut burr 43 may be bent at the time of bonding and protrude from the inner peripheral surface of the hole of the disk substrate 31, thereby deteriorating the quality of the bonded substrate.

The present invention solves the above-mentioned problems of the conventional disk molding die, and when two disk substrates are bonded to each other, cut burrs interfere with each other to cause a bonding failure or a bonding failure. A disk molding die that does not degrade the quality of the bonded substrates, such that the cut burrs are bent at the time of bonding and project to the inner peripheral surface of the hole of the disk substrate,
An object of the present invention is to provide a bonded substrate and a manufacturing method thereof.

[0016]

Therefore, in the disk molding die of the present invention, a bonded substrate is manufactured by bonding disk substrates.

A fixed-side mirror block; a stamper attached to the fixed-side mirror block for forming information surfaces which are opposed to each other when the disk substrates are bonded to each other; A fixed-side cutter that is disposed on the side and forms a cut hole by the first and second tip surfaces; a movable-side mirror block that is disposed to face the fixed-side mirror block; And a movable cutter disposed radially inward, for punching a prototype of the disk substrate when the tip advances into the cut hole.

The first end surface is set a predetermined distance ahead of the surface of the stamper, and forms a step on the surface of the disk substrate with the molding.

Another disk molding die of the present invention further includes a sprue bush disposed radially inward of the fixed cutter. Then, the tip surface of the sprue bush is placed on the same plane as the second tip surface.

In the bonded substrate of the present invention, the fixed-side mirror block, the stamper attached to the fixed-side mirror block, and the fixed-side mirror block are disposed radially inward from the fixed-side mirror block, and are fixed from the surface of the stamper A fixed die provided with a fixed cutter having a first tip surface set forward by a distance of, and a second tip surface formed behind the first tip surface, and the fixed mirror. It is manufactured by a disk molding die having a movable mirror block disposed to face the block, and a movable die having a movable cutter disposed radially inward of the movable mirror block. You.

Then, a resin is filled in a cavity space formed between the fixed mold and the movable mold to form a master of a disk substrate having an information surface, and the movable cutter is advanced. , Into the cut hole formed by the first and second tip surfaces, perform a drilling process on the original disk substrate, and remove the information surface of the disk substrate after the drilling process is performed. Laminate them facing each other.

In another bonded substrate of the present invention, the substrate is disposed radially inward of the fixed-side mirror block,
The first set a predetermined distance ahead of the surface of the stamper
A disk substrate formed by a disk forming die having a fixed side cutter having a front end surface is bonded with the information surfaces facing each other.

In the method of manufacturing a bonded substrate according to the present invention, the fixed-side mirror block, the stamper attached to the fixed-side mirror block, and the stamper disposed radially inward from the fixed-side mirror block are provided. A fixed die having a first end surface set a predetermined distance forward from the surface and a fixed side cutter having a second end surface formed rearward from the first end surface; A disk molding die having a movable mirror block disposed to face a fixed mirror block, and a movable die having a movable cutter disposed radially inward of the movable mirror block. It is applied to substrates bonded together.

Then, resin is filled into a cavity space formed between the fixed mold and the movable mold to form a disk substrate prototype having an information surface, and the movable cutter is advanced. , Into the cut hole formed by the first and second tip surfaces, perform a drilling process on the original disk substrate, and remove the information surface of the disk substrate after the drilling process is performed. The disk substrates are bonded together so as to face each other.

[0025]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a cross-sectional view of a main part of a disk molding die according to an embodiment of the present invention, and FIG. 4 is a cross-sectional view of a main part of a disk substrate formed by the disk molding die in the embodiment of the present invention. It is.

In the figure, reference numeral 11 denotes a fixed mold, and 12 denotes a movable mold which is disposed so as to be able to freely contact and separate from the fixed mold 11, and a disk is formed by the fixed mold 11 and the movable mold 12. A mold is formed, and a cavity space 17 is formed between the two.

The fixed mold 11 includes a fixed-side mirror block 18 attached to a fixed-side base plate (not shown), a sleeve-shaped inner stamper holder 33 disposed radially inward from the fixed-side mirror block 18, A sleeve-shaped fixed bush 49 as a fixed cutter disposed radially inward from the inner stamper holder 33, and a radially inwardly disposed bush 49 from the fixed bush 49, and a sprue 16 formed in the center. And a sleeve-shaped sprue bush 15.

The movable mold 12 is mounted on a movable base plate (not shown), and is disposed opposite to the fixed mirror block 18 in a radial direction from the movable mirror block 37. On the inside, a sprue cut punch 36 as a movable cutter disposed opposite to the sprue bush 15 and the fixed side bush 49, and a radially outer side of the movable mirror block 37 and the cavity Space 1
7 having a not-shown cavity forming the outer peripheral surface.

The resin injected from an injection nozzle (not shown) is filled into the cavity space 17 through the sprue 16 and solidified in the cavity space 17 to become a master of the disk substrate 51.

One surface S1 of the disk substrate 51 is used as an information surface, and digital information is written on the surface S1. Therefore, a stamper 32 is provided in the fixed die 11 so as to face the cavity space 17.
As a result, irregularities corresponding to the digital information are formed on the surface S1 of the disk substrate 51.

In order to attach the stamper 32 to the fixed-side mirror block 18, an inner stamper holder 33 is fixed to the fixed-side mirror block 18, and a holding portion 3 formed on the outer peripheral edge of the inner stamper holder 33.
4 presses the inner peripheral edge of the stamper 32 against the fixed-side mirror block 18. In this embodiment, in order to fix the inner stamper holder 33 to the fixed-side mirror block 18, the fixed-side mirror block 1 is fixed.
Although the inner stamper 8 and the inner stamper holder 33 are screwed together, other fixing means may be used.

The holding portion 34 is formed by projecting from the tip end surface S12 of the inner stamper holder 33 toward the movable mold 12, and when the inner stamper holder 33 is fixed to the fixed side mirror block 18, the inner stamper The tip surface S12 of the holder 33 is set so as to be located slightly forward (to the left in the drawing) from the surface S3 facing the cavity space 17 of the stamper 32.

The surface S3 of the stamper 32 corresponds to the surface S1 of the disk substrate 51, and the first end surface S14 of the fixed bush 49 corresponds to the surface S19 of the disk substrate 51. Then, the first tip surface S1
By setting the position 4 ahead of the surface S3 of the stamper 32 by a predetermined distance H, a step is formed by the distance H between the surface S1 and the surface S19 of the disk substrate 51.

The fixed bush 49 and the sprue cut punch 36 constitute an in-mold gate cut mechanism for making a hole in the original mold of the disk substrate 51 formed in the cavity space 17. And
At the tip of the fixed side bush 49, the first
Of the inner stamper holder 33, the second end surface S5 is formed in front of the second end surface S5, and the second end surface S5 is formed on the inner peripheral side. Tip surface S of inner stamper holder 33
The step is set rearward (to the right in the figure) from the step 12 and a step is formed by the first and second tip surfaces S14 and S5. The tip surface S6 of the sprue bush 15 is the second surface.
Is placed on the same plane as the front end surface S5 of the first. Thus, the cut hole 41 is formed by the second tip surface S5 and the tip surface S6.

Therefore, after the cavity space 17 is filled with the resin, the sprue cut punch 36 is advanced (moved to the right in the drawing), and the tip of the sprue cut punch 36 enters the cut hole 41. A hole is formed in the prototype of the disk substrate 51 formed in the space 17. In this way, the original pattern of the disk substrate 51 can be subjected to drilling.

When the tip of the sprue cut punch 36 enters the cut hole 41, the fixed bush 4
9 enters between the sprue cut 9 and the sprue cut punch 36, and cut burrs 52 as shown in FIG.
Is formed on the inner peripheral edge of the hole on the side of the surface S19.
Is behind the surface S1 by a distance H (left side in the figure)
Therefore, as long as the height h of the cut burr 52 is smaller than the distance H, the tip of the cut burr 52 does not protrude from the surface S1.

Therefore, when the two disk substrates 51 are bonded together with the surfaces S1 facing each other, the cut burrs 52 do not interfere with each other, and a bonding failure occurs or the cut burrs 52 are bent at the time of bonding. As a result, it does not protrude into the inner peripheral surface of the hole of the disc substrate 51, so that the quality of the DVD substrate is not degraded.

It should be noted that the present invention is not limited to the above-described embodiment, but can be variously modified based on the gist of the present invention, and they are not excluded from the scope of the present invention.

[0040]

As described in detail above, according to the present invention, in a disk molding die, a bonded substrate is manufactured by bonding a disk substrate.

And a fixed mirror block, a stamper attached to the fixed mirror block, and a stamper for forming information surfaces which are opposed to each other when the disk substrates are bonded to each other. A fixed-side cutter that is disposed on the side and forms a cut hole by the first and second tip surfaces; a movable-side mirror block that is disposed to face the fixed-side mirror block; And a movable cutter disposed radially inward, for punching a prototype of the disk substrate when the tip advances into the cut hole.

The first end surface is set a predetermined distance ahead of the surface of the stamper, and forms a step on the surface of the disk substrate with the molding.

In this case, when the tip of the movable cutter enters the cut hole, the resin enters between the fixed cutter and the movable cutter, and cut burrs are formed on the inner peripheral edge of the hole of the disc substrate. However, the tip of the cut burr does not protrude from the information surface of the disk substrate.

Therefore, when the two disk substrates are bonded together, the cut burrs do not interfere with each other, resulting in defective bonding, or the cut burrs are bent at the time of bonding and the inner peripheral surface of the hole of the disk substrate is bent. Since it does not protrude, the quality of the bonded substrates does not deteriorate.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of a disk molding die according to an embodiment of the present invention.

FIG. 2 is a sectional view of an essential part of a conventional disk molding die.

FIG. 3 is a sectional view of a main part of a disk substrate formed by a conventional disk molding die.

FIG. 4 is a sectional view of a main part of a disk substrate formed by a disk forming die according to the embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 11 fixed mold 12 movable mold 15 sprue bush 17 cavity space 18 fixed mirror block 32 stamper 36 sprue cut punch 37 movable mirror block 41 cut hole 49 fixed bush 51 disk board S1, S3, S19 surface S5 second Tip surface S6 Tip surface S14 First tip surface H Distance

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Yuichi Inada 731 Naganumahara-cho, Inage-ku, Chiba-shi, Chiba F-term in the Chiba Works, Sumitomo Heavy Industries, Ltd. 4F202 AH38 AH79 CA11 CB01 CK06 CK35 CK84

Claims (5)

[Claims] 1. A disk molding die for manufacturing a bonded substrate by bonding disk substrates, comprising: (a) a fixed mirror block; and (b) a disk mounted on the fixed mirror block. (C) a stamper disposed radially inward of the fixed-side mirror block and having a cut hole formed by the first and second distal end surfaces; A fixed-side cutter to be formed; (d) a movable-side mirror block disposed to face the fixed-side mirror block; and (e) a radially-inwardly disposed side of the movable-side mirror block. A movable-side cutter for making a hole in the original disk substrate when the leading end enters the cut hole; and (f) the first leading end surface is closer to the surface of the stamper. Is set a predetermined distance ahead,
A disk molding die, wherein a step is formed on a surface of a disk substrate during molding. (A) a sprue bush disposed radially inward from the fixed cutter;
(B) The disk molding die according to claim 1, wherein the tip surface of the sprue bush is placed on the same plane as the second tip surface. 3. A fixed-side mirror block, a stamper attached to the fixed-side mirror block, and disposed radially inward from the fixed-side mirror block, and set a predetermined distance ahead of the surface of the stamper. A first tip surface,
And a fixed mold having a fixed cutter having a second tip surface formed rearward from the first tip surface, and a movable mirror block disposed to face the fixed mirror block. And (a) between the fixed mold and the movable mold by a disk molding mold having a movable mold provided with a movable cutter disposed radially inward of the movable mirror block. Filling the cavity space formed with resin, molding a disk substrate prototype with an information surface,
(B) advancing the movable-side cutter so that a tip thereof enters a cut hole formed by the first and second tip surfaces, and performs a drilling process on a prototype of the disk substrate;
(C) A bonded substrate, wherein the information surfaces of the disc substrates after the perforation processing are bonded to each other with the information surfaces facing each other. 4. A disk molding die provided with a fixed cutter having a first distal end face disposed radially inward of the fixed mirror block and set a predetermined distance ahead of the surface of the stamper. Characterized in that the disc substrates formed by the above are laminated together with their information surfaces facing each other. 5. A fixed-side mirror block, a stamper attached to the fixed-side mirror block, and disposed radially inward from the fixed-side mirror block, and set a predetermined distance ahead of the surface of the stamper. A first tip surface,
And a fixed mold having a fixed cutter having a second tip surface formed rearward from the first tip surface, and a movable mirror block disposed to face the fixed mirror block. And a movable mold provided with a movable cutter disposed radially inward of the movable mirror block. A resin is filled into a cavity space formed between the movable mold and the movable mold to form a prototype of a disk substrate having an information surface, and (b) the movable cutter is advanced to set the tip to the first position. Piercing the cut hole formed by the second front end face, making a hole in the original disk substrate, and (c) causing the information surfaces of the disk substrate after the hole making process to face each other. And attach the disc substrate The bonded substrate manufacturing method characterized by.