JP3343137B2 - Adhesive coating device for optical disks - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method of manufacturing a double-sided optical disk capable of writing and reading information signals on both main surfaces thereof by laminating a pair of optical disks. The present invention relates to a device for applying an adhesive for an optical disk to be used for performing the above.

[0002]

2. Description of the Related Art Conventionally, optical disks such as magneto-optical disks have been proposed as recording media for writing and reading information signals.

A magneto-optical disk has a disk substrate made of a transparent material such as polycarbonate, and information signals are written and read from one main surface of the disk substrate by optical means. That is, a signal recording layer is formed on the other main surface of the disk substrate. The signal recording layer is formed by laminating a thin film made of a material having a magneto-optical effect such as amorphous rare earth-transition metal alloy, a reflective layer, a dielectric layer, and the like.

In this magneto-optical disk, a focused laser beam is transmitted through a disk substrate and irradiated to a signal recording layer, and only a minute area of the signal recording layer is heated to a temperature higher than the Curie temperature or a temperature compensation point. An information signal can be written by applying an external magnetic field to the set area.
That is, a recording device for writing an information signal to such a magneto-optical disk includes an optical pickup device that irradiates a laser beam to the magneto-optical disk, and a magnetic head device that applies an external magnetic field to the magneto-optical disk. ing.

In this type of optical disk, as shown in FIG. 5, the other main surfaces of the two optical disks 101, 101 are stuck together to write and / or read information signals on both main surfaces. Has been proposed. A disk hub 102 is attached to the center of one main surface of the optical disk 101. The disk hub 102 is a disk made of a metal material having a positioning hole formed in the center. This disk hub 102
Is used in the recording and / or reproducing apparatus.
1 is a reference for positioning.

In constructing such a double-sided optical disk, first, an adhesive is applied to the other main surface of each optical disk. As shown in FIG. 6, the application of the adhesive is performed using an adhesive applying device for an optical disk provided with an application roll 201 on which an adhesive 203 is applied to an outer peripheral surface portion. In this optical disc adhesive coating device, the coating roll 201 is made of a hard material such as a metal.
And is rotatably supported. A first gear 207 is provided at one end of the first support shaft 205.
Is attached. The second gear 210 attached to the drive shaft of the motor 211 meshes with the first gear 207. By making the axis parallel to the application roll 201 and bringing the peripheral surface portion close to the peripheral surface portion of the application roll 201,
A backup roll 204 is provided. The backup roll 204 is made of a material such as silicon rubber,
The second support shaft 206 is rotatably supported. A third gear 208 is attached to one end of the second support shaft 206. Third gear 208 meshes with first gear 207.

That is, the optical disk adhesive applying apparatus includes an applying roll 201 and a backup roll 204.
Is rotated by the motor 211 in the direction of arrow a in FIG. At this time, the application roll 201 and the backup roll 204 have the same peripheral surface portion speed.

An adhesive reservoir 202 is provided above the application roll 201. The adhesive reservoir 202 is formed as a housing whose upper side and lower side are open, and has a lower portion slidably contacting the outer peripheral surface of the application roll 201. An adhesive 203 is stored in the adhesive reservoir 202. The adhesive 203 stored in the adhesive reservoir 202 is
When the application roll 201 is rotated, the application roll 20 is rotated.
1 is almost uniformly thinly applied to the peripheral surface portion.

Optical disk 10 to which adhesive 203 is applied
1 is a coating roll 201 and a backup roll 204
Is rotated at a predetermined speed, one main surface portion is positioned on the backup roll 204 side, and the other main surface portion is positioned on the application roll 201 side, and between the backup roll 204 and the application roll 201. Inserted. Then, the peripheral surface of the coating roll 201 is
01 is applied to the other main surface of the optical disk 101 with the adhesive 203 rolled on the other main surface of the optical disc 101 and adhered to the peripheral surface of the application roll 201.

The backup roll 204 has a band-shaped recess 204a formed substantially at the center of the peripheral surface.
The band-shaped recess 204 a has a width substantially corresponding to the diameter of the disk hub 102 and a depth substantially corresponding to the thickness of the disk hub 102 over the entire circumference of the peripheral surface of the backup roll 204. The band-shaped recess 204a is provided to prevent the disk hub 102 from being pinched between the application roll 201 and the backup roll 204. That is, when the disk hub 102 is sandwiched between the application roll 201 and the backup roll 204, the disk substrate of the optical disk 101 is curved between the application roll 201 and the backup roll 204, and the adhesive 203 is applied to the optical disk satisfactorily. You can't do that.

[0011]

In the above-described adhesive applying apparatus for an optical disk, the backup roll 204 is provided with the band-shaped recess 204a, so that the other main surface of the optical disk 101 is provided as shown in FIG. The adhesive 203 is better on the band-shaped portion 104 passing on the upper band-shaped recess 204a than on the side portions 103, 103 passing on the side of the band-shaped recess 204a on the other main surface. And only a thin adhesive layer is formed. This is because the backup roll 204 cannot sufficiently press the coating roll 201 of the optical disc 101 on the strip-shaped recess 204a.

If there is such uneven coating of the adhesive 203 on the other main surface of the optical disc 101, that is, the non-uniformity of the adhesive layer, the other main surfaces of the two optical discs 101 are stuck together. In such a case, these optical disks 101, 101 cause so-called waviness due to warpage, distortion, and the like. Although these warpages and distortions are extremely small, each of the optical discs 101, 101
Writing and / or reading good information signals from the

Accordingly, the present invention has been proposed in view of the above situation, and the application of an adhesive to these optical discs for bonding the two optical discs together forms a uniform adhesive layer. It is an object of the present invention to provide an optical disk adhesive applying apparatus which can perform a double-sided optical disk having good recording and reproduction characteristics of information signals.

[0014]

SUMMARY OF THE INVENTION In order to solve the above problems and achieve the above object, an optical disk adhesive applying apparatus according to the present invention is provided so as to be movable and has an optical disk mounted thereon. A carrier for supporting one of the main surfaces, a driving means for moving the carrier, and a coating device which is arranged near the movement path of the carrier, and which has a peripheral surface covered with an adhesive and rotated. Roll and this application roll
A synchronous control means for rotating at a rotational speed at which the speed of the peripheral surface portion is equal to the moving speed of the transfer table.

The transport table is moved so that the mounting surface on which the optical disk is mounted faces the peripheral surface of the coating roll at a distance corresponding to the thickness of the optical disk. The sheet passes through the vicinity of the application roll, and the peripheral surface of the application roll is brought into contact with the other main surface of the loaded optical disk. At this time, the application roll is synchronized
The adhesive is applied to the optical disk supported by the carrier by being rotated by the control means so that the peripheral surface speed is equal to the moving speed of the carrier and rotated in the same direction as the carrier. I do.

[0016]

The adhesive application device for an optical disk according to the present invention is
An optical disk is mounted so as to be movable, and a carrier that supports one main surface of the optical disk moves the mounting surface on which the optical disk is placed by moving the optical disk. It passes through the vicinity of the application roll while facing the peripheral surface of the application roll, which is disposed in the vicinity of the path and is rotated by applying an adhesive to the peripheral surface thereof, at a distance corresponding to the thickness of the optical disk. The application roll is
The synchronous control means rotates the peripheral surface at a rotational speed equal to the moving speed of the carrier and in the same direction as the moving direction of the carrier, and applies an adhesive to the optical disc supported by the carrier.

In the adhesive applying apparatus for an optical disk, the peripheral surface of the application roll evenly contacts the other main surface of the optical disk supported by the carriage, and the adhesive applied to the other main surface of the optical disk is sheared. Transfer without applying force to give force.

[0018]

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

As shown in FIGS. 4 and 5, the adhesive coating apparatus for an optical disk according to the present invention comprises two optical disks 10 as shown in FIG.
The information signal writing and / or the information signal writing for both main surface portions are performed by bonding the main surface portions 1 and 101 to each other.
Alternatively, it is an apparatus for applying an adhesive to the main surface of each optical disk 101 in configuring a double-sided optical disk capable of reading.

The optical disk 101 is a so-called magneto-optical disk, and includes an acrylic resin, a polycarbonate resin,
A signal recording layer is formed on a main surface of a disk-shaped disk substrate made of a transparent material such as polyolefin resin, epoxy resin, glass, or the like. In the optical disk 101, information signals are written and read from one main surface side of the disk substrate by optical means. That is, the signal recording layer is formed on the other main surface of the disk substrate.

The signal recording layer has a pre-groove formed on a main surface portion by a stamper disposed in a molding die when a disk substrate is formed by injection molding, and is formed on the pre-groove. Magnetic material layer. The magnetic material layer is formed of a material having a magneto-optical effect, such as a rare earth-transition metal alloy amorphous such as a TbFeCo-based amorphous. On this signal recording layer, a protective layer made of an ultraviolet curable resin or the like is formed so as to cover the signal recording layer.

At the center of one main surface of the optical disk 101, a disk hub 102 for positioning and holding the optical disk 101 in a recording and / or reproducing apparatus or the like is attached. This disk hub 10
Reference numeral 2 denotes a disk made of a metal material having a positioning hole formed in the center, and serves as a reference for positioning the optical disk 101 in a recording and / or reproducing apparatus or the like.

In this magneto-optical disk, only a small area of the signal recording layer is heated to a temperature higher than the Curie temperature or the temperature compensation point by an optical pickup device or the like, and an external magnetic field is applied to the heated region by a magnetic head device or the like. As a result, an information signal is written. That is, information signals are written to the magneto-optical disk in a recording device including an optical pickup device and a magnetic head device.

The double-sided optical disk is constructed by bonding the other main surfaces of the two optical disks 101, 101 together with an adhesive. To manufacture such a double-sided optical disc, first, an adhesive is applied to the other main surface of each of the optical discs 101, 101, and then, FIG.
As shown by the middle arrow D, these optical discs 101, 10
This is performed by joining the other main surface portions of the two together. It should be noted that this bonding is performed on each of the optical discs 101 and 10.
1 is relatively positioned so that the respective disk hubs 102 and 102 are coaxial with each other, and then a predetermined pressure is applied.

The optical disk adhesive applying apparatus according to the present invention for applying the adhesive to the optical disk 101 has an application roll 1 on which an adhesive 3 is applied to an outer peripheral surface as shown in FIGS. are doing.

The coating roll 1 is made of a hard material such as metal, and is rotatably supported by being attached to a support shaft 4. One end of the support shaft 4 is connected to a drive shaft of the roller rotation motor 5. That is, the application roll 1 is rotated around the axis by the roller rotation motor 5.

On the upper side of the application roll 1, an adhesive reservoir 2 is provided.
Are arranged. The adhesive reservoir 2 is formed as a housing whose upper side and lower side are open, and the lower side portion is in sliding contact with the outer peripheral surface of the application roll 1. An adhesive 3 is stored in the adhesive reservoir 2. The adhesive 3 is of a so-called hot melt type. When the application roll 1 is rotated in the direction of arrow A in FIG. 1, the adhesive 3 stored in the adhesive reservoir 2 is applied almost uniformly and thinly on the peripheral surface of the application roll 1.

A feed shaft 7 is provided below the coating roll 1 so that the axis is perpendicular to the axis of the coating roll 1. The feed shaft 7 is a shaft in which a screw thread is formed on a peripheral surface portion. One end of the feed shaft 7 is connected to a drive shaft of a transport motor 6 serving as a driving means.
The rotation operation is performed around the axis in the direction of the middle arrow B.

A transport table 9 is attached to the feed shaft 7. As shown in FIG. 3, the transfer table 9 is formed in a substantially rectangular plate shape, and has a support portion 8 protruding from a lower surface portion. A screw screw hole 17 penetrates the support portion 8. The screw screw hole 17 is formed so that the axial direction is parallel to the upper surface of the transfer table 9. The transfer table 9 is provided with a screw screw hole 17 and a feed shaft 7.
And is supported by the feed shaft 7. When the feed shaft 7 is rotated by the feed motor 6, the feed table 9 moves in the direction of the arrow C in FIG.
Moved in the direction.

The transfer table 9 has a flat plate-shaped member formed of a material having good vibration absorption such as silicon rubber on the upper surface portion. That is, the upper surface of the transfer table 9 is the upper surface of the plate-shaped member and serves as the mounting surface 10. The transfer table 9 supports the mounting surface 10 in parallel with the axis of the application roll 1. When the transfer table 9 is moved along the feed shaft 7, the transfer surface 9 faces the mounting surface 10 at a distance corresponding to the thickness of the optical disc 1, for example, about 1.2 mm, with respect to the peripheral surface of the application roll 1. It is arranged so as to pass near the application roll 1 while being made to rotate.

The mounting surface 10 of the mounting table 9 is provided with a pair of disk hub insertion recesses 13, 13.
The disc hub insertion recesses 13 are circular recesses having a size substantially corresponding to the disc hub 102.
It has a depth corresponding to the thickness of the disk hub 102. That is, when the optical disk 101 is mounted on the mounting table 9 in a state where one main surface of the optical disk 101 is brought into contact with the mounting surface section 10 and the disk hub 102 is inserted into the disk hub insertion recess 13, the mounting table 9 Placement surface section 10
Accordingly, the entire surface of one main surface of the optical disk 101 is supported flat. On this mounting table 9, each optical disk 10
1, 101 are arranged in the axial direction of the application roll 1.

A plurality of suction slits 15 are formed on the mounting surface 10 of the mounting table 9 at positions around the pair of disc hub insertion recesses 13. These suction slits 15 are communicated with a tunnel section 14 formed inside the mounting table 9.
The suction pipe 16 has one end attached to the side surface of the mounting table 9 through the suction pipe 4. The other end of the suction pipe 16 is connected to a vacuum pump (not shown). That is, the vacuum pump sucks air from the suction slits 15, 15 via the suction pipe 16 and the tunnel section 14. The suction pipe 16 is formed of a flexible material.

The apparatus for applying adhesive for optical disks according to the present invention comprises an optical disk 101,
101 is placed with one of the main surface portions facing the placement surface 10 side,
By operating the vacuum pump, the optical discs 101 are sucked and held on the mounting surface 10.
The transfer table 9 is moved to bring the peripheral surface of the application roll 1 into contact with the other main surface of each of the optical discs 101, 101 placed and sucked and held, and apply the adhesive 3 to this main surface. Let it.

In this optical disk adhesive coating apparatus, the FV converter 11 detects the rotation speed of the roller rotation motor 5. That is, the FV converter 11 is supplied with a pulse signal synchronized with the rotation of the roller rotation motor 5 from the roller rotation motor 5 and outputs an output signal having a voltage value corresponding to the rotation speed of the roller rotation motor 5. The output signal of the FV converter 11 is supplied to a motor controller 1 serving as a synchronous control unit.
Sent to 2. The motor controller 12 controls the rotation speed of the transport motor 6 according to the output signal of the FV converter 11 sent. That is, the optical disc adhesive coating device can synchronize the rotation speed of the coating roller 1 with the moving speed of the transfer table 9. And the application roll 1
The rotation operation is performed at a rotation speed at which the tangential speed of the peripheral surface portion is equal to the moving speed of the transfer table 9.

The optical discs 101 and 1 are formed by using the optical disc adhesive coating apparatus according to the present invention having the above-described structure.
In order to apply the adhesive 3 to the other main surface portion of the “01”, first,
Each of these optical discs 101 is sucked and held on the mounting surface 10 of the carrier 9. At this time, the application roll 1
Has been previously rotated in the direction of arrow A in FIG. The transfer table 9 is stopped because the transfer motor 6 is stopped.

Next, by rotating the transport motor 6 at a high speed, the transport table 9 is moved at a high speed to a position near the application roller 1 as shown by an arrow C in FIG. Here, the motor controller 12 is operated to synchronize the moving speed of the transfer table 9 with the tangential speed of the peripheral surface of the application roller 1.

When the transfer table 9 passes below the coating roller 1 at a moving speed synchronized with the tangential speed of the coating roller 1, the coating roller 1 is moved to the peripheral surface of each optical disk 10.
Roll contact with the other main surface of each of 1, 101 simultaneously,
The applied adhesive 3 is applied onto each main surface. At this time, the rotation direction of the application roller is indicated by an arrow A in FIG.
And C, the direction is the same as the moving direction of the transfer table 9.

In this adhesive coating apparatus for optical disks, the application roller 1 rolls without sliding on the other main surface of each of the optical disks 101, 101, and the entire surface of one main surface of each of the optical disks 101, 101. Is flatly supported by the mounting surface portion 10 having flexibility, so that a uniform adhesive layer is formed on the other main surface portion of each of the optical discs 101, 101.

The carriage 9 that has passed under the coating roll 1
When the conveyance motor 6 is released from the control by the motor controller 12 and rotated at a high speed, it is separated from the application roller 1 at a high speed and stopped at a predetermined position. Each optical disk 1
01 and 101 are released from the transfer table 9 after the suction holding by the vacuum pump is released, and are sent to a bonding step in which the other main surfaces are joined to each other.

The transport table 9 from which the optical discs 101 and 101 have been removed passes under the coating roller 1 when the transport motor 6 is rotated at a high speed.
And returned to the initial position where the optical disk is placed. At this time, the mounting surface 10 is
Passes through the vicinity of the application roller 1 at a distance corresponding to the thickness of the optical disk 101 with respect to the peripheral surface of the
Is not deposited.

The present invention can be applied not only to a magneto-optical disk as shown in the above-described embodiment, but also to various optical disks used only for reading information signals.

[0042]

As described above, the optical disk adhesive applying apparatus according to the present invention is provided so as to be movable and has an optical disk mounted thereon, and the carrier for supporting one main surface of the optical disk is movable. By being operated, the mounting surface on which the optical disk is mounted is moved in the vicinity of the moving surface of the application roll, which is disposed near the moving path of the transfer table, and the adhesive is applied to the circumferential surface and the rotating surface is operated. The optical disk passes through the vicinity of the application roll while facing each other at a distance corresponding to the thickness of the optical disk. The coating roll is rotated by the synchronous control means at a rotational speed at which the speed of the peripheral surface portion is equal to the moving speed of the carrier, and is rotated in the same direction as the moving direction of the carrier, and the adhesive is applied to the optical disk supported by the carrier. Is applied.

Accordingly, the carrier makes the entire surface of the other main surface of the optical disk uniformly contact the peripheral surface of the coating roll, and makes the adhesive layer formed on this main surface uniform.

Further, by rotating the application roll in the same direction at a rotational speed where the peripheral surface is equal to the moving speed of the transfer table, the peripheral surface of the application roll is applied to the other main surface of the optical disk. The optical disk is rolled without generating a shearing force on the adhesive, thereby forming a good uniform adhesive layer on the other main surface of the optical disk.

According to the present invention, the adhesive applied to the optical discs for laminating two optical discs can be uniformly applied to form an adhesive layer having a uniform thickness. A double-sided optical disk having good information signal recording / reproducing characteristics can be manufactured.

[Brief description of the drawings]

FIG. 1 is a perspective view showing the configuration of an optical disk adhesive applying apparatus according to the present invention.

FIG. 2 is a side view, partially broken away, showing the configuration of the optical disk adhesive application device.

FIG. 3 is an enlarged perspective view showing a configuration of a carrier of the optical disc adhesive coating device.

FIG. 4 is a perspective view illustrating a step of bonding two optical disks.

FIG. 5 is a perspective view showing a configuration of a double-sided optical disk formed by laminating two optical disks.

FIG. 6 is a perspective view showing a configuration of a conventional optical disc adhesive applying apparatus.

FIG. 7 is a perspective view showing an optical disc to which an adhesive is applied by the conventional optical disc adhesive applying apparatus.

[Explanation of symbols]

1 coating roll, 6 transfer motor, 9 transfer table,
10 mounting surface, 10 optical disk

Continuation of front page (56) References JP-A-3-245329 (JP, A) JP-A-63-308744 (JP, A) JP-A-61-3341 (JP, A) JP-A-3-209645 (JP) , A) JP-A-2-199639 (JP, A)

Claims (1)

(57) [Claims] An optical disk mounted on the optical disk and supporting a first main surface of the optical disk; a driving unit configured to move the optical disk; and a moving path of the optical disk. An application roll that is disposed in the vicinity and that is rotated by applying an adhesive to a peripheral surface thereof, and the application roll is rotated to a rotational speed at which the speed of the peripheral surface of the application roll is equal to the moving speed of the transfer table. And a synchronous control means for performing a rotating operation with respect to the optical disk. When the transport table is moved, the mounting surface on which the optical disk is mounted is equivalent to the thickness of the optical disk with respect to the peripheral surface of the coating roll. distance separating the passes by the coating roll while opposing the other main surface of the mounted optical disc is brought into contact with the circumferential surface of the coating roll, the coating roll is controlled by the synchronization control means
The speed of the peripheral portion is a rotation speed equal to the moving speed of the transfer table, the rotation speed is rotated in the same direction as the moving direction of the transfer table, and an adhesive is applied to the optical disc supported by the transfer table. Optical disc adhesive coating device.