JP3936651B2 - Mold for molding disk substrate - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a mold for molding a disk substrate used when injection molding a disk substrate for recording information such as a CD-ROM, CD-R, and DVD.
[0002]
[Prior art]
As a mold for molding a disk substrate used for injection molding of a disk substrate, a stamper attached to the mold is heated during injection filling in order to improve the flow of molten resin in the cavity. It is desirable to be. Further, in order to speed up the molding cycle, it is necessary to cool the molten resin quickly, and it is desirable that the stamper is in a cooled state after the injection filling of the molten resin is completed. As a mold for forming a disk substrate that satisfies such requirements, those described in Japanese Patent Application Laid-Open No. 8-90624 (Patent Document 1) and Japanese Patent Application Laid-Open No. 8-132498 (Patent Document 2) are known.
[0003]
According to Patent Document 1, it is described that an electrode is provided on an inner peripheral pressing member and an outer peripheral pressing ring of a stamper, and the stamper is energized from the electrode to generate heat. However, since the thing of patent document 1 energizes radially between the inner peripheral side and outer peripheral side of the doughnut-shaped stamper which has a center hole, there existed a problem that a heating nonuniformity tends to occur in a stamper. In addition, there is an ejector sleeve or the like on the inner circumferential holding member side, and there is a problem that the structure becomes complicated if electrodes are provided.
[0004]
Further, Patent Document 2 describes that the stamper is induction-heated by applying a high-frequency current to an electromagnetic coil provided on the outer periphery of the stamper support plate. However, in this method, since the stamper is heated by induction heating, there is a problem that it takes time to heat the stamper as compared with the resistance heating method. Therefore, when the temperature of the stamper is increased to a desired temperature in the formation of the disk substrate, there is a problem that the molding cycle time is delayed. There is also a problem that uneven heating tends to occur in the stamper.
[0005]
[Patent Document 1]
JP-A-8-90624 ((Claim 1), (0019), (0022), (FIG. 1))
[Patent Document 2]
JP-A-8-132498 ((Claim 6), (0058), (0059), (FIG. 2), (FIG. 3))
[0006]
[Problems to be solved by the invention]
The present invention has been made in view of the above problems, and an object of the present invention is to allow a stamper to be uniformly heated in a short time in a disk substrate molding die used for injection molding of a disk substrate. And
[0007]
[Means for Solving the Problems]
The mold for molding a disk substrate according to claim 1,A cavity formed with a stamper attached to the surface of at least one of a movable mold and a fixed mold that are arranged so as to be able to contact and separate from each other, and the movable mold is in contact with the fixed mold In a mold for molding a disk substrate, a molten resin material is injected and filled from an injection device into a mold, and a stamper having a predetermined transfer region around the hole formed in a central portion or a back side of the stamper A plate-like heating element affixed to the plate and an electrode arranged to contact the stamper or the plate-like heating element, and the stamper or the plate-like heating element is arranged The molten resin of the mold on the side can be separated from and brought into contact with the mirror plate maintained at a temperature capable of cooling, and is heated by resistance through the electrodes when separated from the mirror plate. Others are provided A ring-shaped convex portion having an inner peripheral surface forming a disk substrate outer peripheral surface and a height corresponding to the thickness of the disk substrate is formed on the opposing surface of the stamper in the mold of the die. The stamper center hole pressing member that presses the vicinity of the center hole of the stamper is provided so as to be movable together with the stamper.It is characterized by that.
[0008]
The disk substrate molding die according to claim 2,A cavity formed with a stamper attached to the surface of at least one of a movable mold and a fixed mold that are arranged so as to be able to contact and separate from each other, and the movable mold is in contact with the fixed mold In a mold for molding a disk substrate, a molten resin material is injected and filled from an injection device into a mold, and a stamper having a predetermined transfer region around the hole formed in a central portion or a back side of the stamper A plate-like heating element affixed to the plate and an electrode arranged to contact the stamper or the plate-like heating element, and the stamper or the plate-like heating element is arranged The molten resin of the mold on the side can be separated from and brought into contact with the mirror plate maintained at a temperature capable of cooling, and is heated by resistance through the electrodes when separated from the mirror plate. Previously provided Stamper outer portion pressing member for pressing the outer edge of the stamper center hole pressing member and the stamper for pressing a central hole near the stamper is movable together with the stamperIt is characterized by that.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
A first embodiment of the present invention will be described with reference to FIG. 1 and FIG. FIG. 1 is a cross-sectional view of the disk substrate according to the first embodiment. In the figure, the upper part of the center line shows a state in which the stamper and the mirror plate are separated, and the lower part of the center line in the figure is the stamper and the mirror plate. The state which contact | abutted is shown. FIG. 2 is a front view of the movable mold according to the first embodiment as viewed from the fixed mold side.
[0010]
In FIG. 1, a movable mold 1 is located on the left side and is attached to a movable plate (not shown). Further, a fixed mold 2 is located on the right side in FIG. 1 and is attached to a fixed plate (not shown). The movable mold 1 and the fixed mold 2 are disposed so as to face each other by being attached to the movable platen and the fixed platen, and can be brought into and out of contact with each other by moving the movable platen. When the movable mold 1 and the fixed mold 2 are joined, a cavity is formed between both molds, and a disk substrate is obtained by injecting molten resin into the cavity from an injection device (not shown).
[0011]
The movable mold 1 will be described. The movable mold 1 includes a mold main body 3 attached to the movable platen and a mirror plate 4 attached to the mold main body 3. The mirror plate 4 has a medium passage 4a for temperature adjustment, and is provided so as to be able to maintain the temperature at which the molten resin injected and filled in the cavity can be cooled. The surface 4b of the mirror plate 4 is covered with an insulator made of ceramic or the like. A stamper 5 is attached to the surface 4b of the mirror plate 4 and has a substantially rectangular shape with a central hole 5a formed at the center corresponding to the hole of the disk substrate. In the first embodiment, the stamper 5 is made of nickel, its outer dimensions are 160 mm × 240 mm, and its thickness is 0.3 mm. A transfer region 5b is formed in a predetermined range around the center hole 5a of the stamper 5 in a donut shape. The dimensions, thickness, material, and the like of the stamper 5 are not limited to the above, and the stamper 5 may not be formed with a pattern.
[0012]
A hole 6 is formed in the central part of the mold body 3 and the mirror plate 4 of the movable mold 1. The hole 6 is provided with a cylindrical stamper center hole pressing member 7 and the like. The stamper central hole pressing member 7 is a cylindrical member having one diameter expanded. A claw portion 7b for preventing the vicinity of the central hole 5a of the stamper 5 from being lifted is formed on the outer peripheral side of the large diameter portion 7a of the stamper central hole pressing member 7. In the stamper center hole pressing member 7, the back surface of the claw portion 7b and the surface of the large diameter portion 7a of the stamper center hole pressing member 7 are covered with an insulator made of ceramic. Further, a threaded portion 7 c is formed in the small diameter portion of the stamper central hole pressing member 7.
[0013]
On the movable platen side (hereinafter referred to as one side) of the hole 6 formed in the mold body 3 and the mirror plate 4, a pressing member attaching member 8 for attaching the stamper central hole pressing member 7 cannot be removed. Has been inserted. The threaded portion 7c of the stamper center hole pressing member 7 can be screwed into the shaft core of the pressing member mounting member 8 on the fixed mold 2 side (hereinafter referred to as the other side) from one side to the other side. A screw hole 8a is formed. When the stamper center hole pressing member 7 is screwed to the pressing member mounting member 8, the claw portion 7b is provided to prevent the stamper 5 from being lifted near the center hole 5a.
[0014]
The pressing member mounting member 8 is provided with a large diameter portion 8b on the outer periphery on one side. The large-diameter portion 8b of the pressing member mounting member 8 is formed in a cylindrical shape having a predetermined length in one direction and the other direction, being slightly larger in diameter than the large-diameter portion 8b formed in the mold main body portion 3. Are inserted into the gap 9. Therefore, the pressing member attaching member 8 is movable by a predetermined amount L obtained by subtracting the thickness of the large diameter portion 8 b from the predetermined length of the gap portion 9. The predetermined amount L is 3 mm in the first embodiment. A spring 10 is inserted between the pressing member mounting member 8 and the step 6a of the hole 6, and the pressing member mounting member 8 is always urged toward one side by the spring 10. An air passage 11 communicates with the one side of the gap 9 from the outside of the movable mold 1 so that air can be supplied and sucked into the gap 9. Therefore, when air is supplied into the gap 9, the stamper center hole pressing member 7 is moved to the other side by a predetermined amount L against the force of the spring 10. It is moved to the side by a predetermined amount L. Further, a male cutter 12 for cutting the gate and an ejector sleeve 13 for pushing out the disk substrate are disposed in the inner hole 7d of the stamper central hole pressing member 7.
[0015]
As shown in FIGS. 1 and 2, a stamper outer edge pressing member 14 is fixed at a position outside the outer edge 5 c of the substantially rectangular stamper 5 of the mold body 3. In the first embodiment, the stamper outer edge pressing member 14 is a member that comes into contact when the stamper 5 is separated from the mirror plate 4. A recess 15 is formed between the stamper outer edge pressing member 14 (on the stamper 5 side) and the surface 4 b of the mirror plate 4. The distance between the one side and the other side of the recess 15 is a distance obtained by adding the predetermined amount L to which the stamper 5 is moved and the thickness of the stamper 5.
[0016]
And in the said recessed part 15, the surface facing the mirror surface plate 4 of the stamper outer edge part pressing member 14 and the electrode 17 mentioned later is the stamper contact surface 14a. Further, in the concave portion 15, the facing surface 14b facing the outer edge portion 5c of the stamper 5 is spaced apart from the outer edge portion 5c of the stamper 5 by a predetermined distance, and can cope with the thermal expansion of the stamper 5. . The stamper contact surface 14a and the opposing surface 14b are covered with an insulator such as ceramic. Further, an inner peripheral surface 14c is formed on the surface of the stamper outer edge pressing member 14 on the mold center side. An air passage 16 is formed inside the stamper outer edge pressing member 14, and an opening is formed in the stamper contact surface 14a. In the first embodiment, the stamper outer edge pressing member 14 is formed from a single member, but may be configured from a plurality of divided members.
[0017]
As shown in FIG. 2, electrodes 17 for energizing the stamper 5 are in contact with the back surfaces of the outer edge portion 5c of the stamper 5 on the side of one outer edge portion 5c1 and the other outer edge portion 5c2. . In the first embodiment, the electrode 17 also serves as a moving means for the stamper 5. The electrode 17 includes a large-diameter portion 17 a and a small-diameter portion 17 b, and an end surface of the large-diameter portion 17 a serves as a stamper contact surface 17 c that contacts the back surface of the stamper 5. An electrical wiring 18 is connected to the small diameter portion 17 b of the electrode 17. The electrode 17 is covered with an insulator made of ceramic or the like other than the connection portion between the stamper contact surface 17c and the electric wiring 18. The electrode 17 is inserted into a hole 19 formed in the mirror plate 4 facing the stamper contact surface 14a of the stamper outer edge pressing member 14. The other side of the hole 19 is a large-diameter portion 19a slightly larger in diameter than the large-diameter portion 17a of the electrode 17, and one side is a small-diameter portion 19b slightly larger in diameter than the small-diameter portion 17b of the electrode 17. ing. A spring 20 is inserted into the large diameter portion 19 a of the hole 19, and an end portion of the spring 20 is brought into contact with a step portion between the large diameter portion 17 a and the small diameter portion 17 b of the electrode 17 inserted into the hole 19. ing. Therefore, the electrode 17 is urged toward the other side by the spring 20. An air passage 21 is opened in the large diameter portion 19 a of the hole 19.
[0018]
Therefore, the electrode 17 is movable by a predetermined amount L toward one side against the force of the spring 20 by sucking air from the air passage 21. When the electrode 17 is moved to the other side, the electrode 17 is brought into contact with the stamper contact surface 14a of the stamper outer edge pressing member 14 via the stamper 5, and further movement is prevented. The position of the opening of the air passage 16 formed on the stamper outer edge pressing member 14 and having an opening formed on the stamper abutting surface 14a is preferably formed opposite to the position of the electrode 17.
[0019]
In the first embodiment, the same number of electrodes 17 are provided on the back surface in the vicinity of one outer edge portion 5c of the stamper 5 and on the back surface side in the vicinity of the other outer edge portion 5c (5 in the first embodiment). Are arranged in a row and are in contact with the back surface of the stamper 5. Accordingly, the electrode 17 is disposed so that the electrode 17d disposed on the other outer edge portion 5c2 side is opposed to the electrode 17d disposed on the one outer edge portion 5c1 side. Similarly, the electrode 17f and the electrode 17g are also arranged to face each other, and the gap between the opposed one and the other electrodes 17d and 17e and the gap between the electrodes 17f and 17g are arranged at equal intervals. The number of electrodes 17 is not limited. Alternatively, the electrode 17 may be provided on the stamper abutting surface 14a side of the stamper outer edge pressing member 14, and only the means for moving the stamper 5 may be provided at the position of the electrode 17 in FIG.
[0020]
Air passages 22, 23, 24 are formed inside the mold body 3 and the mirror plate 4, and the openings are opened in the surface 4 b of the mirror plate 4 on the back side of the stamper 5. The air between the mirror plate 4 and the stamper 5 is sucked to assist the operation of bringing the stamper 5 into contact with the mirror plate 4.
[0021]
Next, the fixed mold 2 will be described. The fixed mold 2 includes a mold main body 25 that is attached to a fixed plate (not shown) and a mirror plate 26 that is attached to the mold main body 25. The mirror surface plate 26 has a medium passage 26a for temperature adjustment, and is provided so as to maintain a temperature at which the molten resin injected and filled in the cavity can be cooled. A hole 27 is formed at the center of the mold body 25 and the mirror plate 26, and the hole 27 is provided with a sprue bush 28 for introducing molten resin injected from an injection device (not shown) into the cavity. It has been.
[0022]
In the first embodiment, a convex portion 29 having a predetermined height formed in a ring shape around the sprue bush 28 is formed on the outer peripheral side of the mirror plate 26 of the fixed mold 2. The height H of the convex portion 29 substantially corresponds to the thickness of the disc substrate to be molded, and the inner peripheral surface 29a is the outer peripheral surface of the disc substrate forming a part of the cavity. Further, the upper surface 29b of the convex portion 29 is a surface facing the stamper 5, and is covered with an insulator such as ceramic. When the movable mold 1 is clamped with respect to the fixed mold 2, air or gas can be removed between the upper surface 29b of the convex portion 29 and the stamper 5 so that molten resin does not enter. An interval of a certain degree is provided.
[0023]
Further, a concave portion 30 is formed outside the convex portion 29 to fit the stamper outer edge pressing member 14 when the movable mold 1 and the fixed mold 2 are joined. In the first embodiment, the convex portion 29 is formed in a ring shape, but the inner peripheral surface 14 c of the stamper outer edge pressing member 14 of the movable mold 1 is linearly parallel to the outer edge portion 5 c of the stamper 5. In the case of the shape, the outer shape of the convex portion 29 is also formed in a rectangular shape following that. Further, the height H of the convex portion 29 is set to a predetermined height, but the convex portion 29 is attached to the fixed mold 2 via a spring or a cylinder so that the height of the convex portion 29 is adjustable. Also, it can be adapted to injection compression molding.
[0024]
Next, a molding method using the disk substrate molding die of the first embodiment will be described. First, the disk substrate molded last time is ejected by the ejector sleeve 13, and is taken out from the movable mold 1 by an unillustrated take-out device. Thereafter, air is supplied from the air passages 11, 21, 22, 23, and 24, and air is sucked from the air passage 16, so that the stamper 5 is separated from the mirror plate 4 along with the stamper center hole pressing member 7 and the electrode 17. It is moved and is brought into contact with the stamper outer edge pressing member 14 and stopped.
[0025]
Next, energization of the stamper 5 is started via the electric wiring 18 and the electrode 17 from a power supply unit (not shown). In the first embodiment, 0.3V to 3V and 70A to 300A are energized from the AC power source, but a DC power source may be used. The stamper 5 is heated to 150 ° C. in about 1 second. At substantially the same time, the movable platen and the movable mold 1 are moved in the mold closing direction by a mold closing device (not shown) and joined to the fixed mold 2. At that time, air is sucked from the air passages 11, 22, 22, 23, and 24 until the upper surface 29 b of the convex portion 29 of the fixed mold 2 comes into contact with the surface of the stamper 5. The air suction is stopped, and the stamper 5 is moved toward one side together with the stamper center hole pressing member 7 and the electrode 17. The back surface of the stamper 5 is brought into contact with the front surface 4 b of the mirror plate 4. The mirror plate 4 is maintained at 50 degrees by water which is a temperature adjusting medium flowing through the temperature adjusting medium passage 4a.
[0026]
Immediately before the back surface of the stamper 5 is brought into contact with the front surface 4b of the mirror plate 4, the energization from the power source unit to the stamper 5 is stopped, and the resistance heating of the stamper 5 is ended. Accordingly, the stamper 5 having a small heat capacity is brought into contact with the mirror surface plate 4 having a large heat capacity, and at the same time, the stamper 5 finishes heating, whereby the cooling is rapidly started. The timing for stopping the energization of the stamper 5 is not limited to the above, and may be any time until the injection and filling of the molten resin into the cavity described below.
[0027]
Next, molten resin is injected and filled into the cavity from an injection device (not shown). In the first embodiment, the resin used is polycarbonate, and the injection temperature of 300 ° C. starts the injection filling of the molten resin. Since the stamper 5 contracts by heating with the molten resin and cooling from the mirror plate 4 at the time of injection filling, it is desirable that suction from the air passages 22, 23, 24, etc. be weak. When a predetermined time has passed and the temperature of the stamper 5 has been rapidly cooled, air is ejected from the air passage 16 and the air passage on the fixed mold 2 side (not shown), and the cavity including the disk substrate and the transfer surface of the stamper 5 The movable mold 1 is opened while releasing the mold. As described above, the disk substrate is ejected by the ejector sleeve 13, and the disk substrate is taken out by a take-out device (not shown) to obtain a molded disk substrate.
[0028]
Next, the first of the present inventiontwoThe embodiment will be described with reference to FIGS. 3 and 4. FIG. FIG.twoIs a cross-sectional view of the disk substrate of the embodiment, in which the upper part of the center line shows when the stamper and the mirror plate are separated from each other, and the lower part of the center line is when the stamper and the mirror plate are in contact with each other Show. FIG.twoIt is the front view which looked at the movable mold of the embodiment from the fixed mold side.
[0029]
In the second embodiment, the configuration of the stamper central portion pressing member 32 provided in the movable mold 31 is the same as that of the first embodiment, but the configuration of the stamper outer edge portion pressing member 33 is different. Yes. Therefore, it demonstrates centering on difference with 1st embodiment. As shown in FIG. 3, the stamper outer edge pressing member 33 according to the second embodiment is attached to the mold main body 37 via a spring 36 and moves relative to the mold main body 37 and the mirror plate 35. It is possible.
[0030]
Further, a hole 38 is formed inside the stamper outer edge portion pressing member 33, and an electrode 34 having the same shape as that of the first embodiment is built in the hole 38. The contact surface 34 a of the electrode 34 is always pressed against the stamper 40 by a spring 39 provided in the hole 38. An air passage 41 is connected in the hole 38, and the pressure in the electrode 34 against the stamper 40 is adjusted by sucking the air in the hole 38. The electrode 34 is connected to an electrical wiring 42 connected to a power supply unit (not shown). Therefore, the electrode 34 is covered with an insulating material such as ceramic except for the connection portion between the contact surface 34a and the electric wiring 42 as in the first embodiment. The portion 33a of the stamper outer edge pressing member 33 that is in contact with the stamper 40 is also insulated by an insulator such as ceramic. In the second embodiment, the inner peripheral surface 33b on the mold center side of the stamper outer edge pressing member 33 is a circumferential surface as shown in FIG. 4, and is a disk forming a part of the cavity. It is a substrate outer peripheral surface.
[0031]
In the second embodiment, the fixed mold 43 is not formed with the convex portion 29 as in the first embodiment. The mirror plate 44 of the fixed mold 43 is formed with a facing surface 44 a that faces the inner peripheral surface 33 b of the stamper outer edge pressing member 33 of the movable mold 31. The inner peripheral surface 33b of the stamper outer edge pressing member 33 and the facing surface 44a of the mirror plate 44 of the fixed mold 43 are in-fitted with a slight space where molten resin does not enter. Therefore, the second embodiment is a molding die capable of injection compression molding. When the injection compression is completed and the outer periphery of the movable mold 31 and the outer periphery of the fixed mold 43 abut, the thickness of the disk substrate is between the surface of the stamper 40 and the mirror plate 44 of the fixed mold 43. An interval corresponding to is formed.
[0032]
Next, a third embodiment of the present invention will be described with reference to FIG. FIG. 5 is a cross-sectional view of the disk substrate according to the third embodiment. In the figure, the upper part of the center line shows a state where the stamper and the mirror plate are separated, and the lower part of the center line in the figure is the stamper and the mirror plate. Is shown when abuts. In the third embodiment, the electrode 53 is not in direct contact with the stamper 52 disposed in the movable mold 51. A heating element 54 that is resistance-heated is attached to the back surface side of the stamper 52, and the electrode 53 is in contact with the back surface of the heating element 54. Therefore, the stamper 52 is heated via the heating element 54. In the third embodiment, the stamper 52 may be a substantially rectangular shape that is the same as the heating element 54, or may be a circular shape having a central hole as in the related art. When there is a difference in the coefficient of thermal expansion between the heating element 54 and the stamper 52, the stamper 52 may be disposed so as to be locked without attaching the heating element 54 and the stamper 52. In the third embodiment shown in FIG. 5, the heating element 54 is provided separately from the second embodiment, but the heating element 54 is provided in the first embodiment. It may be a thing.
[0033]
Furthermore, regarding the present invention, various application examples can be considered in addition to those described in the first to third embodiments. In the first to third embodiments, the example in which the stamper 5 or the like or the heating element 54 is attached to the movable mold 1 or the like has been described. However, the stamper 5 or the like or the heating element 54 is fixed to the movable mold 1 or the like. What is necessary is just to be attached to at least one side of the mold 2 or the like. In the above-described embodiment, the stamper 5 or the like or the heating element 54 is brought into contact with or separated from the mirror plate 4 or the like by the action of air and a spring. However, as a means for making contact and separation, a fluid pressure cylinder Alternatively, driving means such as a stepping motor may be used. The stamper 5 or the like or the heating element 54 may always be in contact with the mirror plate 4 or the like. Further, the energized stamper 5 or the like or the insulator that insulates the heating element 54 from the mold is not attached to the surface 4b or the like of the mirror plate 4 or the like, but is attached to the back surface of the stamper 5 or the heating element 54 or the like. May be good. Although it is desirable to provide an insulator, if the space between the stamper 5 or the like or the heating element 54 and the mirror plate 4 is sufficiently maintained, the surface 4b or the like of the mirror plate 4 or the like does not have an insulator. The invention can be configured.
[0034]
The movable mold 1 and the like and the fixed mold 2 and the like may be arranged in the vertical direction as long as they are opposed to each other. Alternatively, a plurality of disk substrates may be formed at a time using the movable mold 1 and the like and the fixed mold 2 and the like. In that case, the stamper 5 or the like or the heating element 54 may have a long length and two central holes formed so as to cover both the one cavity and the other cavity. The electrode may be in contact with the back side outside the one cavity of the stamper or the heating element and the back side outside the other cavity.
[0035]
【The invention's effect】
The disk substrate molding die of the present invention has a hole formed in a substantially central portion thereof, and has a predetermined transfer region around it and a substantially rectangular stamper or heating element attached to the die. Since the stamper or heating element is energized from the electrodes provided so as to be in contact with one outer edge side and the other outer edge side of the body, the stamper or heating element is resistance-heated, so that the stamper can be moved in a short time. Can be heated uniformly. Therefore, the flow at the time of injection filling of the molten resin can be improved.
[0036]
Further, by making the stamper or heating element abutted and separated from the mirror plate, the stamper can be heated in a shorter time and the stamper can be cooled in a shorter time. Therefore, the flow during injection filling of the molten resin can be improved, and the molding cycle time can be increased.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a disk substrate molding die according to a first embodiment.
FIG. 2 is a front view of a disk substrate molding die according to the first embodiment.
FIG. 3twoIt is sectional drawing of the metal mold | die for a disc board | substrate of embodiment of this.
FIG. 4twoIt is a front view of the metal mold | die for a disc board | substrate of embodiment.
FIG. 5 is a sectional view of a disk substrate molding die according to a third embodiment.
[Explanation of symbols]
1 ……… Movable mold
2 ……… Fixed mold
3,25 ... Mold body
4,26 …… Mirror plate
4a, 26a ... Medium passage
4b ... surface
5 ……… Stamper
5a ...... Central hole
5b: Transfer area
5c ...... Outer edge
5c1 ... One outer edge
5c2 ... The other outer edge
6, 19, 27 ...... Hole
7 ……… Stamper center hole retainer
7a, 8b, 17a, 19a ...... Large diameter part
7b ... Nail
7c: Screw part
8 ……… Holding member mounting member
8a ... Screw hole
9 ……… Air gap
10, 20 …… Spring
11, 16, 21, 22, 23, 24 ... Air passage
12 ...... Oscutter
13 …… Ejector sleeve
14 ...... Stamper outer edge holding member
14a, 17c ... Stamper contact surface
14b ...... Opposite surface
14c, 29a ...... Inner peripheral surface
15, 30 ... Recess
17, 17d, 17e, 17f, 17g ... Electrode
17b, 19b ...... Small diameter part
18 …… Electric wiring
28 …… Sprue bush
29 …… Projection
29b …… Top view
L ……… Predetermined amount (stamper travel)
H ……… Height (height of convex part)

Claims (2)

A cavity formed with a stamper attached to the surface of at least one of a movable mold and a fixed mold that are arranged so as to be able to contact and separate from each other, and the movable mold is in contact with the fixed mold Injecting and filling the molten resin material from the injection device into the disk substrate mold to obtain the disk substrate,
A stamper having a hole formed in the center and having a predetermined transfer region around the hole, or a plate-like heating element attached to the back side of the stamper;
It consists of a disposed electrodes so as to be in contact with the stamper or the plate-like heating element,
The stamper or the plate-like heating element can be separated from and contacted with a mirror plate maintained at a temperature capable of cooling the molten resin of the mold on the side of the stamper or the plate plate. Provided to be heated by resistance by energizing through the electrode at the time of separation,
The opposite surface of the stamper in the other mold is formed with a ring-shaped convex portion having a height corresponding to the thickness of the disk substrate and the inner peripheral surface forming the outer peripheral surface of the disk substrate. While being provided so that molten resin does not enter from between the convex parts,
A disk substrate molding die, wherein a stamper center hole pressing member for pressing near the center hole of the stamper is provided so as to be movable together with the stamper . A cavity formed with a stamper attached to the surface of at least one of a movable mold and a fixed mold that are arranged so as to be able to contact and separate from each other, and the movable mold is in contact with the fixed mold Injecting and filling the molten resin material from the injection device into the disk substrate mold to obtain the disk substrate,
A stamper having a hole formed in the center and having a predetermined transfer region around the hole, or a plate-like heating element attached to the back side of the stamper ;
It consists of a disposed electrodes so as to be in contact with the stamper or the plate-like heating element,
The stamper or the plate-like heating element can be separated from and contacted with a mirror plate maintained at a temperature capable of cooling the molten resin of the mold on the side of the stamper or the plate plate. Provided to be heated by resistance by energizing through the electrode at the time of separation,
A mold for molding a disk substrate, wherein a stamper center hole pressing member for pressing near the center hole of the stamper and a stamper outer edge pressing member for pressing an outer edge of the stamper are provided so as to be movable together with the stamper .

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