JP2738367B2 - Optical disk molding method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an optical disk molding method, and more particularly to an optical disk molding method for obtaining a transparent substrate (substrate) for an optical disk having excellent mechanical properties.

[0002]

2. Description of the Related Art With the development of the information-oriented society, the amount of data handled by both organizations and individuals is increasing dramatically. Among them, the optical disk has been developed into a read-only ROM medium or a recordable type such as a write-once type and a rewritable type, and has begun to be used in various fields. Higher densities are also being demanded for optical disks that are said to have a large capacity. Especially when trying to handle image information, it becomes huge data and the conventional one side 300MB (130 [mm] write-once type for information processing,
Rewritable disc), 540MB on one side (CD), 60 on one side
An optical disk called 0 MB (CD-ROM) runs short of capacity.

[0003] Therefore, studies on a high-density optical disk in which the current recording density is greatly improved have been actively pursued. In order to increase the density of these optical discs, a reproduction optical system, in particular, a reduction in the wavelength of reproduction light and an increase in NA have been promoted.

However, when the wavelength of the light source is shortened and the NA of the objective lens is increased, the influence of the disk substrate increases. This is because the disc tilt is “λ / NA ³ ” of astigmatism and the disc thickness is “λ / N ³ ” of spherical aberration.
A ⁴ ”, the conventional wavelength λ is 780 to 8
30 [nm] near-infrared laser and NA (aperture ratio) of 0.4
The burden on the optical disk side is significantly larger than the combination of objective lenses of about 2 to 0.45.

[0005] Many of the current optical disks use a high-speed injection molding machine in order to increase productivity. In this process, since the characteristics of the disk vary greatly depending on the cooling method of the disk after the molded disk is removed from the molding machine mold, great care must be taken.

As a cooling method of the molded disk, for example, Japanese Patent Application Laid-Open No. Hei 4-10250 discloses a method of cooling in a frozen atmosphere. A method for flattening by performing is disclosed.
Japanese Patent Application Laid-Open No. 65346 discloses a method of defining an interval of storage in a stack or a magazine.

[0007] However, this publication does not raise any problem regarding the temporal handling of cooling, particularly the presence or absence of stacking.

On the other hand, in the cooling step from the removal of the disk from the mold to the stacking (stacking) during the molding of the optical disk, conventionally, the molded disk is immediately stacked in order to gain tact. FIG. 14 shows this.

In this case, in FIG.
A cooling process line 52 is linearly extended to zero through a static elimination blow region 51. In this case, it took 5 minutes or more to reach room temperature for a 1.2 mm thick product. Code 5
3 is a sputter film formation on the optical disc 100 after cooling,
This shows post-processes such as application of protective resin, label printing, and inspection.

In the conventional example shown in FIG. 14, in the cooling step, a method is adopted in which the cooling step is performed in a state of being stacked (stacked) from the beginning in order to improve productivity. The entire line 52 was a stack disk area.

FIG. 15 shows another conventional example. In the other conventional example shown in FIG. 15, a cooling process line 62 is linearly extended through a static elimination blow area 61 in a disk forming machine 60 as in the case of FIG. Reference numeral 63 denotes a post-process such as sputtering film formation, protection resin application, label printing, and inspection on the cooled optical disc 100.

In the conventional example shown in FIG. 15, in order to prevent the deformation of the disk due to cooling, the cooling process is first performed on one disk (one disk area 61).
A), a method has been adopted in which a transition is made to a stacked (stacked) state stack disk area 61B) after approximately 2/3 of the cooling process has elapsed.

[0013]

However, in the method of FIG. 14, as described above, as a result of stack cooling,
Even though high-speed cooling is possible, the entire optical disk cannot be uniformly cooled, so that there is an inconvenience that deformation (particularly, circumferential deviation of the optical disk in the circumferential direction) is likely to occur on the optical disk.

Further, in the conventional example of FIG. 15, it is possible to effectively reduce the deformation of the optical disk caused in FIG. 14 described above. And the floor space of the entire apparatus increases.

[0015]

SUMMARY OF THE INVENTION It is an object of the present invention to provide an optical disk molding method capable of improving the disadvantages of the prior art and reducing the floor occupation area in the cooling step and effectively suppressing the deformation of the disk. Aim.

[0016]

In order to achieve the above object, according to the first aspect of the present invention, there is provided an injection molding step of injection molding an optical disk, and a cooling step of gradually cooling the injection molded optical disk after passing through a charge removing step. And a post-process of applying a protective film or the like after the cooling process.

In the cooling step, at least three or more odd-numbered cooling stacks are annularly arranged at predetermined intervals on the rotating frame, and the cooling frame is rotated with respect to the cooling stack. Rotating a plurality of optical discs at least every other one in order,
A second step of sequentially taking out the optical discs from the first arranged optical disc after the completion of the placement of the optical discs with respect to the whole of the cooling stack, and stacking a plurality of the optical discs taken out in the second step. And a third step of sending to a subsequent step.

According to the first aspect of the present invention, the optical disc immediately after injection molding in the injection molding step is gradually cooled in a cooling step, and then sent to a post-process for applying a protective film.

In this case, in the cooling process line, injection molding is performed while rotating the rotary frame body, while rotating the rotary frame body into at least three cooling stacks (an odd number of stacks may be provided) arranged in an annular shape on the rotary frame body. The optical disk immediately after
For example, every other place is placed from one place. Then, at the timing when the last optical disk is placed, the optical disk placed first is taken out from the cooling process line. Thereafter, the optical disk is continuously taken out from the cooling process line at the same timing as the mounting of the optical disk.

According to a second aspect of the present invention, the first step of the optical disk molding method according to the first aspect includes the steps of: setting a cooling stack at predetermined intervals at seven locations on the rotating frame; By rotating the rotating frame body, "7-n (where n is 6,
5, 4, 3, 2) optical discs are individually and sequentially arranged.

Therefore, according to the second aspect of the present invention,
Seven optical discs can be placed on the rotating frame in the cooling process line, and the first loaded optical disc can be taken out of the cooling process line at the timing of loading the seventh optical disc, This will be continued below.

According to a third aspect of the present invention, the first step in the optical disk molding method according to the first aspect includes the steps of setting a cooling stack at predetermined intervals at five locations on the rotating frame; By rotating the rotating frame body, “5-n (where n is 4,
(Any one of 3 and 2)), and optical disks are individually and sequentially arranged.

Therefore, according to the third aspect of the present invention,
Five optical discs can be placed on the rotating frame in the cooling process line, and the first loaded optical disc can be taken out from the cooling process line at the timing of loading the fifth optical disc, This will be continued below.

[0024]

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

[0025]

[First Embodiment] The first embodiment corresponds to the first and second aspects of the present invention described above.
This is shown in FIGS.

First, in FIG. 2, reference numeral 1 indicates a molding apparatus, reference numeral 2 indicates a cooling process line, and reference numeral 3 indicates a post-process. The subsequent step 3 is a step for subjecting the cooled optical disk to sputter film formation, application of a protective resin, label printing, inspection, and the like, as in the case of the above-described conventional example. Also, between the molding apparatus 1 and the cooling process line 2,
The static elimination blow area 4 is provided in the same manner as in the above-described conventional example.

FIG. 1 shows an example of the cooling process line 2, and reference numeral 21 denotes a rotating frame. Here, in the cooling process line 2, a cooling blow or the like (not shown) is provided so that air is uniformly blown from above and below the optical disc. Reference numeral 100 denotes a replica of the optical disk immediately after being formed by the forming apparatus 1.

In the embodiment shown in FIGS. 1 and 2, an injection molding step for injection-molding the optical disc 100 and a cooling step for gradually cooling the injection-molded optical disc 100 after passing through a charge removing step. And a post-process of applying a protective film after the cooling process.

As shown in FIG. 3, the molding apparatus 1 includes a molding machine cylinder 11 having a nozzle 11A at the tip, a hopper 12 for supplying a molding material for an optical disk into the molding machine cylinder 11, and a molding machine. A piston-like screw 13 for loosely measuring and kneading the molding material supplied from the hopper 12 while being loosely inserted into the cylinder 11 is provided. Further, a heater 14 is provided around the outer periphery of the molding machine cylinder 11, particularly on the nozzle 11A side, and a hopper 12 is provided.
Is heated from the outside in the molding machine cylinder 11 and melted.

As the molding material, for example, a plastic represented by dried polycarbonate PC is used. The molding material is heated in the molding machine cylinder 11 and kept in a molten state at 300 to 350 ° C. In FIG. 3, reference numeral 15 denotes a gear mechanism for transmitting the rotational force of the motor 16 to the piston screw 13.

The piston screw 13 is connected to a hydraulic device 18 via a plunger 17. Energized by the hydraulic device 18, the piston-shaped screw 1
Numeral 3 is for injecting the molten molding material (molten resin) in the molding machine cylinder 11 from the nozzle 11A to the outside. Reference numerals 19a and 19b denote limit switches for setting the movement stroke of the piston screw 13 by the hydraulic device 18.

A mold 20 for molding an optical disk is provided at the nozzle 11A of the molding machine cylinder 11. The mold 20 includes a fixed mold 20A and a movable mold 20B. In this case, the mold temperature is 85
１００100 ° C. FIG. 4 shows the resin temperature and mold temperature of these molten resins. And mold 2
0, the replica of the optical disc 100 taken out from
It usually takes 5 minutes or more to reach room temperature.

Next, the step of cooling the replica product of the optical disc 100 taken out of the mold 20 will be described with reference to FIGS.

FIG. 1 shows an outline of the cooling process line 2. On the rotary frame 21, seven cooling stacks 21 a, 21 b, 21 c, 21 d, 21 e,
21f and 21g are provided in an annular shape at substantially equal intervals. The rotary frame 21 is supported by a drive shaft 22 and is driven to rotate intermittently (or continuously) in the direction of arrow A by drive means (not shown). The symbol on the rotating frame 21 is a mark for determining the rotating position (the same applies hereinafter).

In the cooling step in the present embodiment, the rotating frame 21 is rotated with respect to the seven cooling standing stacks 21a to 21g on the rotating frame 21 so that the optical discs 100 are individually arranged sequentially every third one. And the optical disk 10 for the whole of the cooling stacks 21a to 21g
0 after the completion of the arrangement of the optical disc 100
A second step of sequentially taking out the respective optical discs 100 in the order in which they are placed from the cooling storage stack 21a having a step, and stacking a plurality of optical discs 100 taken out in the second step and applying a protective film resin coating step. And a third step of sending to a subsequent step.

In FIG. 1, a symbol F indicates a disk mounting position for the optical disk 100 in the first step. The disk mounting position F is fixed at one position without rotating even when the rotating frame 21 rotates. The symbol E indicates the location where the optical disk 100 is removed from the disk.

In FIG. 1, when the rotary frame 21 rotates counterclockwise (direction A in FIG. 1), the position of the cooling stack 21e in FIG. It is set corresponding to the position on the rotating frame 21.

FIG. 5 shows the disk ejection location E of the optical disk 100 and the entire cooling process line.
A description will be given based on (a) to (f).

5 (a) to 5 (f) show the progress of the movement of the optical disk 100 (indicated by the imaginary line) initially placed on the rotating frame 21 and the new optical disk 100 being placed. It shows the situation where FIG. 5A is a diagram illustrating the position and the rotation amount of the optical disc 100 when the optical disc 100 is shifted from the state where the optical disc 100 is first placed to the next operation.

Since the optical discs 100 are placed every third optical disc 100, the cooling stack 21 which is located at a position 3/7 of the initial loading position of the optical disc 100 is rotated.
The second optical disc 100 is placed on d. FIG.
(A) shows this state. In this case, the cooling storage stack 21d is located at the disk mounting position F. Also, the rotation arrow indicates the optical disc 100 loaded first.
The moving direction destinations are indicated respectively.

Hereinafter, the position where the optical disc 100 is placed every two (two in the middle), that is, the position where the optical disc 100 is placed after being rotated by 3/7 is sequentially shown.

5B shows the position where the third sheet is placed, FIG. 5C shows the position where the fourth sheet is placed, and FIG. 5D shows the position where the fifth sheet is placed. FIG. 5 shows the position where
FIG. 5E shows the position where the sixth sheet is placed, and FIG. 5F shows the position where the seventh sheet is placed. The position where the seventh sheet is placed determines the place where the first sheet placed first is finally located at the same time. That is, this is the position of the disk ejection point E in FIG. 5F, and the optical disk 100 is sequentially extracted from the disk ejection point E.

In this case, the first optical disc 100 placed first is rotated twice 4/7 times, and the optical disc 100 shown in FIG.
Reach the position. During this time, the first optical disc 1
00 is effectively and uniformly cooled. Hereinafter, the optical disk 1 which is placed every third and reaches the disk ejection point E
00 are sequentially taken out by rotating the same amount of rotation.

In this manner, the optical discs 100 are uniformly cooled under exactly the same conditions.
Then, the disk mounting operation at the disk mounting location F and the disk unloading operation at the disk unloading location E are
Hereafter, there is an advantage that it is possible to perform the operations continuously at the same timing, to perform a flow operation, and to maintain the uniformity of the quality.

As a result, regarding the mechanical characteristics of a replica disk formed on a normal line (conventional example), particularly the tilt in the radial direction, in the conventional example of FIG.
It was clarified that what was about ° -0.6 ° was significantly improved to about 0.2 ° according to the embodiment of FIG.

[0046]

[Modification (1-1)] Next, a modification (1-1) of the first embodiment will be described. Modification (1-1)
As shown in FIGS. 6A to 6F, the rotating frame 2
A case is shown in which the optical disc 100 is placed on every other (every other one) with respect to the seven left cooling stacks 21a to 21g.

FIG. 6A is a diagram showing the position and the amount of rotation of the optical disk 100 when the optical disk 100 shifts from the state where it is initially loaded to the next operation. Since every other optical disc 100 is placed, the second optical disc 100 is placed on the cooling stack 21c located 2/7 of the rotation from the initial placement position of the optical disc 100. You. FIG. 6A shows this state. In this case, the cooling stack 21c is located at the disk mounting position F.

Hereinafter, the position where the optical disk 100 is placed every other (every other one), that is, the position where the optical disk 100 is placed after being rotated by 2/7 is sequentially shown.

FIG. 6B shows the position where the third sheet is placed, FIG. 6C shows the position where the fourth sheet is placed, and FIG. 6D shows the position where the fifth sheet is placed. FIG. 6 shows the position where
6E shows the position where the sixth sheet is placed, and FIG. 6F shows the position where the seventh sheet is placed. The position where the seventh sheet is placed determines the place where the first sheet placed first is finally located at the same time. That is, the position of the symbol E in FIG.
, The optical disc 100 is sequentially taken out.

In this case, the first optical disc 100 placed first is rotated 5/7 times once, and the optical disc 100 shown in FIG.
Reach the position. During this time, the first optical disc 1
00 is effectively and uniformly cooled. Thereafter, the optical discs 100 that are placed every other one and rotate by the same amount of rotation and reach the disc ejection location E are sequentially taken out.

Also in this case, each optical disc 100 is uniformly cooled under exactly the same conditions. And
The disk mounting operation at the disk mounting position F and the disk unloading operation at the disk unloading position E can be performed sequentially and continuously at the same timing, and the uniformity of quality is maintained as in the case of FIG. can do.

[0052]

[Modification (1-2)] Next, a modification (1-2) of the first embodiment will be described below. This modification (1)
7) As shown in FIGS. 7A and 7B, seven cooling stacks 21 a to 21 g on the rotating frame 21.
Optical disk 100 every three (three in the middle)
Is shown.

FIG. 7A is a diagram showing the position and the amount of rotation of the optical disk 100 when the optical disk 100 shifts from the state where it is initially loaded to the next operation. Since the optical disk 100 is placed in the middle three positions, the second optical disk 100 is placed on the cooling stack 21e located at a position rotated 4/7 from the initial mounting position of the optical disk 100. Is done. FIG. 7A shows this state. In this case, the cooling stack 21c is located at the disk mounting position F.

Thereafter, every third optical disc 100 is placed in the same manner as in FIG. 5 described above. FIG. 7 (b)
Shows the position where the seventh sheet is placed. The position where the seventh sheet is placed determines the place where the first sheet placed first is finally located at the same time. That is, this is the position of the symbol E in FIG. 7B, and the optical disk 1 rotated by the same amount from the position of the optical disk unloading point E.
00 are sequentially taken out.

In this case, the first optical disk 100 placed first makes 3/7 rotations three times and reaches the disk unloading point E in FIG. 7B. During this time, the first optical disc 100 is effectively and uniformly cooled. Less than,
The optical discs 100 that are placed every third place and rotate by the same amount to reach the optical disc take-out point E are sequentially taken out from the optical disc take-out place E.

Even in this case, each optical disk 100 is uniformly cooled under exactly the same conditions. And
The disk mounting operation at the disk mounting position F and the disk unloading operation at the disk unloading position E can be performed sequentially and continuously at the same timing, and the uniformity of quality is maintained as in the case of FIG. can do.

[0057]

[Modification (1-3)] Next, a modification (1-3) of the first embodiment will be described below. This modification (1)
8) As shown in FIGS. 8A and 8B, seven cooling stacks 21 a to 21 g on the rotating frame 21 are used.
Optical disk 100 every four (in the middle four)
Is shown.

FIG. 8A is a diagram showing the position and the amount of rotation of the optical disk 100 when the optical disk 100 shifts from the state where it is initially loaded to the next operation. Since the optical disc 100 is placed in the middle four, the second optical disc 100 is placed on the cooling stack 21f located 5/7 of a rotation from the initial placement position of the optical disc 100. Is done. FIG. 8A shows this state. In this case, the cooling stack 21f is located at the disk mounting position F.

Thereafter, every fourth optical disc 100 is placed in the same manner as in FIG. 5 described above. FIG. 8B
Shows the position where the seventh sheet is placed. The position where the seventh sheet is placed determines the place where the first sheet placed first is finally located at the same time. That is, the symbol E in FIG. 8B is the symbol E, and the optical disc 100 is sequentially taken out from the position of the optical disc taking place E.

In this case, the first optical disc 100 placed first reaches the disc take-out point E in FIG. 8B by rotating 2/7 times four times. During this time, the first optical disc 100 is effectively and uniformly cooled. Less than,
The optical discs 100 that are placed every fourth and rotate the same amount to reach the optical disc take-out point E are sequentially taken out from the optical disc take-out place E.

Also in this case, each optical disk 100 is uniformly cooled under exactly the same conditions. And
The disk mounting operation at the disk mounting position F and the disk unloading operation at the disk unloading position E can be performed sequentially and continuously at the same timing, and the uniformity of quality is maintained as in the case of FIG. can do.

[0062]

[Modification (1-4)] Next, a modification (1-4) of the first embodiment will be described below. This modification (1)
4), as shown in FIGS. 9A and 9B, seven cooling standing stacks 21a to 21g on the rotating frame 21.
Optical disk 100 every 5th (5 out of 5)
Is shown.

FIG. 9A is a diagram showing the position and the amount of rotation of the optical disk 100 when the optical disk 100 shifts from the state where it is initially loaded to the next operation. Since the optical disk 100 is placed in five of them, the second optical disk 100 is placed on the cooling storage stack 21g located at a position that is rotated by か ら from the initial placement position of the optical disk 100. Is done. FIG. 9A shows this state. In this case, the cooling storage stack 21g is located at the disk mounting position F.

Thereafter, every fifth optical disc 100 is placed in the same manner as in FIG. 5 described above. FIG. 9B
Shows the position where the seventh sheet is placed. The position where the seventh sheet is placed determines the place where the first sheet placed first is finally located at the same time. That is, the symbol E in FIG. 9B is that, and the optical disc 100 is sequentially taken out from the position of the optical disc taking out point E.

In this case, the first optical disk 100 placed first reaches the disk unloading point E in FIG. 9B by rotating 1/7 times five times. During this time, the first optical disc 100 is effectively and uniformly cooled. Less than,
The optical discs 100 that are placed every fifth place and rotate the same amount to reach the optical disc take-out location E are sequentially taken out from the optical disc take-out location E.

Also in this case, each optical disc 100 is uniformly cooled under exactly the same conditions. And
The disk mounting operation at the disk mounting position F and the disk unloading operation at the disk unloading position E can be performed sequentially and continuously at the same timing, and the uniformity of quality is maintained as in the case of FIG. can do.

[0067]

Second Embodiment The second embodiment corresponds to the third and fifth aspects of the present invention described above, and is shown in FIGS.

The second embodiment differs from the first embodiment in that seven cooling stacks 21a to 21g are provided on the rotary frame 21 in the cooling step. Five cooling stacks 23a on the body 23
The feature is that it is equipped with ２３23e. In this case, the size (diameter) of the rotary frame 23 is set to be smaller than the diameter of the rotary frame 21 in FIG. 1 described above.

FIG. 10 schematically shows a cooling process line 2 according to the second embodiment. Five cooling stacks 23a, 23b,
23c, 23d, and 23e are provided in a ring shape at substantially equal intervals. The rotary frame 23 is supported by a drive shaft 24 and is driven to rotate intermittently (or continuously) in the direction of arrow A by drive means (not shown).

In the cooling step in the present embodiment, the rotating frame 23 is rotated with respect to the five cooling stacks 23a to 23e on the rotating frame 21 so that the optical discs 100 are sequentially arranged individually every other one. And the optical disk 10 for the whole of the cooling stacks 23a to 23e
0 after the completion of the arrangement of the optical disc 100
A second step of taking out the optical disc 100 from the cooling storage stacks 23a to 23e having the above, and a third step of superposing the optical discs 100 taken out in the second step on a plurality of sheets and sending it to a protective resin coating step or the like. And a process.

In FIG. 10, the symbol F corresponds to FIG.
As in the case of the optical disc 100 in the first step,
Of the disk for loading is shown. This disk mounting location F
Are fixed in one place without rotating even when the rotating frame body 23 rotates. The symbol E indicates the optical disk 10
0 indicates the location where the disk is removed.

In FIG. 10, when the rotary frame 23 is rotated counterclockwise, the disk take-out position E of the optical disk 100 corresponds to the position of the cooling stack 23c, that is, the position on the rotary frame 23. Is set.

Next, the entire cooling process line including the disc take-out point E of the optical disc 100 is shown in FIG.
This will be described below based on (a) to (d).

FIGS. 11A to 11D show the progress of the movement of the optical disk 100 (indicated by the imaginary line) initially placed on the rotating frame 23 and the new optical disk 100 being placed. It shows the situation where

FIG. 11A is a diagram showing the position and the amount of rotation of the optical disk 100 when the optical disk 100 shifts from the state where it is initially loaded to the next operation. Since the optical disc 100 is placed every other optical disc 100, the second optical disc 100 is placed on the cooling stack 23c which is located at a position two-fifths of a turn from the initial placement position of the optical disc 100. You. FIG. 11A shows this state. In this case, the cooling stack 23c is located at the disk mounting position F.

Hereinafter, the position where the optical disk 100 is placed every other (every other one), that is, the position where the optical disk 100 is placed after being rotated by ５, is sequentially shown.

That is, FIG. 11B shows the position where the third sheet is placed, FIG. 11C shows the position where the fourth sheet is placed, and FIG. Indicates the position on which is placed.
The position where the fifth sheet is placed determines the place where the first sheet placed first is finally located at the same time. That is, the symbol E in FIG. 11D is that, and the optical disc 100 is sequentially taken out from the position of the optical disc take-out point E.

In this case, the first optical disc 100 placed first reaches the position E in FIG. 11D by rotating 3/5 once. During this time, the first optical disc 100 is effectively and uniformly cooled. Hereinafter, the optical disk is taken out at every third place,
Are sequentially taken out from the optical disc taking place E. Other configurations are the same as those of the first embodiment shown in FIGS. 1 to 5 described above.

By doing so, each optical disk 100 can obtain the same effect as in the case of FIG. 1 described above. Then, the disk mounting operation at the disk mounting position F and the disk unloading operation at the disk unloading position E can be continuously performed at the same timing, thereby enabling a continuous operation and maintaining uniformity of quality. In addition, there is an advantage that the size of the cooling process line can be further reduced.

[0080]

[Modification (2-1)] Next, a modification (2-1) of the second embodiment will be described. Modified example (2-1)
12A and 12B, it is assumed that the rotating frame 23 rotates counterclockwise, and five cooling stacks on the rotating frame 23 are counted at the disk mounting position F. 23a
This shows a case where the optical disc 100 is placed every other (every two of them) with respect to .about.23e. Other configurations are the same as those of the above-described second embodiment.

Here, FIG. 12A shows the optical disk 10
FIG. 11 is a diagram showing the position and the rotation amount of the optical disc 100 when the operation shifts from the state where 0 is initially placed to the next operation.
Since the optical disc 100 is placed in two of them, the second optical disc 100 is placed on the cooling storage stack 23d located at a position that is 3/5 of the rotation of the optical disc 100 from the initial placement position. Is done. FIG. 12A shows this state. In this case, the cooling storage stack 23d is located at the disk mounting position F as a matter of course.

Thereafter, every third optical disc 100 is placed in the same manner as in the case of FIG. 11 described above. FIG.
(B) shows the position where the fifth sheet is placed. The position where the fifth sheet is placed determines the place where the first sheet placed first is finally located at the same time. That is, FIG.
The symbol E in (b) is that, and the optical disc 100 is sequentially taken out from the position of this optical disc take-out location E.

In this case, the first optical disc 100 placed first reaches the disc take-out point E in FIG. During this time, the first optical disc 100 is effectively and uniformly cooled. Thereafter, the optical discs 100 that are placed every third place, rotate by the same amount of rotation, and reach the disc ejection location E are sequentially taken out.

Even in this case, each optical disk 100 is uniformly cooled under exactly the same conditions. And
The disk mounting operation at the disk mounting position F and the disk unloading operation at the disk unloading position E can be performed sequentially and continuously at the same timing, and the uniformity of quality is maintained as in the case of FIG. can do.

[0085]

[Modification (2-2)] Next, a modification (2-2) of the second embodiment will be described.

This modification (2-2) is similar to that shown in FIG.
As shown in (b), on the premise that the rotating frame 23 rotates counterclockwise, it is counted at the disc mounting position F and the rotating frame 23 is counted.
This shows a case where the optical disc 100 is placed every third (three in the middle) on the upper five cooling storage stacks 23a to 23e. Other configurations are the same as those of the second
This is the same as the embodiment.

Here, FIG. 13A shows the optical disc 10
FIG. 11 is a diagram showing the position and the rotation amount of the optical disc 100 when the operation shifts from the state where 0 is initially placed to the next operation.
Since the optical disc 100 is placed in the middle three, the second optical disc 100 is placed on the cooling storage stack 23e located at a position rotated by ／ from the initial placing position of the optical disc 100. Is done. FIG. 13A shows this state. In this case, the cooling storage stack 23e is naturally located at the disk mounting position F.

Thereafter, every third optical disc 100 is placed in the same manner as in FIG. 11 described above. FIG.
(B) shows the position where the fifth sheet is placed. The position where the fifth sheet is placed determines the place where the first sheet placed first is finally located at the same time. That is, FIG.
The symbol E in (b) is that, and the optical disc 100 is sequentially taken out from the position of this optical disc take-out location E.

In this case, the first optical disc 100 placed first reaches the disc take-out point E in FIG. During this time, the first optical disc 100 is effectively and uniformly cooled. Thereafter, the optical discs 100 that are placed every third place, rotate by the same amount of rotation, and reach the optical disc take-out location E are sequentially taken out.

Even in this case, each optical disk 100 is uniformly cooled under exactly the same conditions. And
The disk mounting operation at the disk mounting position F and the disk unloading operation at the disk unloading position E can be performed sequentially and continuously at the same timing, and the uniformity of quality is maintained as in the case of FIG. can do.

Here, in each of the first and second embodiments and the modifications, the optical disc 100 is placed within one rotation of the rotating frames 21 and 23.
If necessary, the optical discs 100 may be sequentially placed after one or more rotations.

Further, the first embodiment and the modified example illustrate a case where seven cooling stacks 21a to 21g are provided, and the second embodiment and the modified example. Although the case where five cooling stacks 23a to 23e are provided has been exemplified, the number of the cooling stacks may be three or nine or more as long as it is an odd number. In this case, the take-out location E of the optical disc 100 is determined by two conditions, that is, the number of the cooling stacks and the intervals at which the optical discs 100 are placed. The same applies to the above embodiments and their modifications.

[0093]

Since the present invention is constructed and functions as described above, according to the present invention, the replica disks taken out of the mold are annularly mounted on the rotating frame at predetermined intervals on a rotating frame basis. Even so, since the cooling is performed while rotating the whole, it is possible to take a sufficient cooling time for each sheet in the cooling process without expanding the cooling process line,
For this reason, the deformation of the disk can be effectively suppressed.

Further, with the above-described configuration, it is possible to continuously execute the loading operation and the unloading operation of the optical disk at the same timing, thereby ensuring the uniformity of the quality of each optical disk. be able to.

Further, the floor occupied area of the line can be significantly reduced as compared with the case of a straight line in which the same number is continuously and simultaneously cooled, so that the facility for accommodating this line can be downsized. Thus, it is possible to provide an unprecedented excellent optical disk molding method capable of reducing capital investment.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing an example of a cooling process line in a first embodiment of an optical disk molding method according to the present invention.

FIG. 2 is a block diagram showing a schematic configuration for executing an optical disk forming step including a cooling step line disclosed in FIG. 1;

FIG. 3 is a partially omitted cross-sectional view showing an example of the molding apparatus disclosed in FIG. 2;

FIG. 4 is a comparative explanatory view showing a change in temperature in a part of the molding apparatus disclosed in FIG. 2, a mold, and the like.

5A and 5B are explanatory diagrams showing the operation of FIG. 1; FIG. 5A is an explanatory diagram showing a case where a second optical disk immediately after molding is mounted; FIG. FIG. 5 (c) is an explanatory view showing the case where the optical disk of FIG. 5 is mounted, and FIG. 5 (c) is an explanatory view showing the case where the fourth optical disk immediately after molding is mounted, and FIG.
FIG. 5E is an explanatory diagram showing a case where a fifth optical disk immediately after molding is mounted, FIG. 5E is an explanatory diagram showing a case where a sixth optical disk immediately after molding is mounted, and FIG. It is an explanatory view showing a case where the seventh optical disk immediately after is loaded.

6A and 6B are diagrams showing an operation of a modified example (1-1) of the embodiment in FIG. 1, and FIG. 6A is an explanatory diagram showing a case where a second optical disk immediately after molding is placed; (B) is an explanatory diagram showing a case where a third optical disk immediately after molding is mounted,
FIG. 6C is an explanatory diagram showing a case where a fourth optical disk immediately after molding is mounted, and FIG. 6D is an explanatory diagram showing a case where a fifth optical disk immediately after molding is mounted. FIG. 6E is an explanatory diagram showing a case where a sixth optical disk immediately after molding is mounted, and FIG. 6F is an explanatory diagram showing a case where a seventh optical disk immediately after molding is mounted.

7A and 7B are diagrams showing an operation of a modified example (1-2) of the embodiment in FIG. 1; FIG. 7A is an explanatory diagram showing a case where a second optical disk immediately after molding is placed; (B) is an explanatory view showing a case where a seventh optical disk immediately after molding is mounted.

8A and 8B are diagrams showing an operation of a modified example (1-3) of the embodiment in FIG. 1; FIG. 8A is an explanatory diagram showing a case where a second optical disk immediately after molding is placed; (B) is an explanatory view showing a case where a seventh optical disk immediately after molding is mounted.

9A and 9B are diagrams showing an operation of a modified example (1-4) of the embodiment in FIG. 1, and FIG. 9A is an explanatory diagram showing a case where a second optical disk immediately after molding is placed; (B) is an explanatory view showing a case where a seventh optical disk immediately after molding is mounted.

FIG. 10 is an explanatory diagram showing an example of a cooling process line in a second embodiment of the optical disc molding method according to the present invention.

FIG. 11 is an explanatory diagram showing the operation of FIG. 10;
FIG. 11B is an explanatory diagram showing a case where a second optical disk immediately after molding is mounted, FIG. 11B is an explanatory diagram showing a case where a third optical disk immediately after molding is mounted, and FIG. FIG. 11D is an explanatory diagram showing a case where the fourth optical disk immediately after the molding is mounted, and FIG. 11D is an explanatory diagram showing a case where the fifth optical disk immediately after the molding is mounted.

FIG. 12 is a modified example (2-1) of the embodiment in FIG. 10;
12 (a) is an explanatory view showing a case where a second optical disk immediately after molding is mounted, and FIG. 12 (b).
FIG. 4 is an explanatory diagram showing a case where a fifth optical disk immediately after molding is mounted.

FIG. 13 is a modified example (2-2) of the embodiment in FIG. 10;
13 (a) is an explanatory view showing a case where the second optical disc immediately after molding is mounted, and FIG. 13 (b)
FIG. 4 is an explanatory diagram showing a case where a fifth optical disk immediately after molding is mounted.

FIG. 14 is an explanatory diagram showing a conventional example.

FIG. 15 is an explanatory diagram showing another conventional example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Forming apparatus 2 Cooling process line 3 Post-process 21 and 23 Rotating frame body 21a, 21b, 21c, 21d, 21e, 21f, 2
1g, 23a, 23b, 23c, 23d, 23e Cooling stack 100 Optical disk E Optical disk removal position F Optical disk mounting position

Claims (3)

(57) [Claims] 1. An injection molding process for injection molding an optical disc, a cooling process for gradually cooling the injection molded optical disc after a static elimination process, and a post process for applying a protective film or the like after the cooling process. In the optical disc molding method provided, the cooling step is performed by disposing at least three or more and odd-numbered cooling stacks on a rotating frame at predetermined intervals in an annular shape, and A first step of rotating the rotating frame body to sequentially dispose the optical discs at least every other one, and disposing the optical discs on the entire cooling stacks after the disposition of the optical discs is completed. A second step of sequentially taking out each optical disc from the obtained optical discs, and a second step of superposing the optical discs taken out in the second step on a plurality of sheets and sending out the plurality of optical discs to the post-process. Optical disk molding method characterized by comprising the steps. 2. The method according to claim 1, further comprising: installing the cooling stack at predetermined intervals at seven locations on the rotary frame, and rotating the rotary frame to perform cooling at each of the seven locations. 7-n (where n is 6,
The optical disk molding method according to claim 1, wherein the optical disks are individually and sequentially disposed every "5, 4, 3, 2". 3. The method according to claim 1, wherein the cooling step is performed by setting the cooling stack at five locations on the rotary frame at predetermined intervals and rotating the rotary frame at each of the five locations. "5-n (where n is 4,
3. The optical disk molding method according to claim 1, wherein the optical disks are individually and sequentially disposed every other one of (3) and (2).