JPH03290882A - Adhering method for hub for optical disk - Google Patents

Abstract

PURPOSE:To make adhere a hub in a short time without damaging the accuracy of relative positions for the centers of a disk and the hub by fixing the relative positions of the optical disk and the hub by a hub fixing bar and next irradiating the adhesive surface of the hub simultaneously with plural beams from the upper surface of the hub. CONSTITUTION:In the state of making the center of an optical disk 12 coincident with that of a hub 12, first of all, a light setting adhesive agent is applied to an adhesive surface 44 in one or both the optical disk 15 and the hub 12, and after loading these optical disk 15 and hub 12 onto a spindle 12 so that the hub 12 can be positioned at a hole 38 of the optical disk 15, the relative positions of the optical disk 15 and the hub 12 are fixed by a hub fixing bar 40. Next, the adhesive surface 44 of the hub 12 is irradiated with the plural beams from the upper surface of the hub 12 simultaneously by a quartz fiber 43. Thus, the hub 12 is made to adhere in a short time without damaging the accuracy of the relative positions for the optical disk 15 and the hub 12.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application!l!+S) The present invention relates to a method for adhering a hub for an optical disk, and in particular, to a method for adhering a hub for an optical disk, and in particular to a method for adhering a hub for an optical disk. This invention relates to a bonding method that allows hubs to be bonded together in a short time.

(Prior Art) Optical disks and magneto-optical disks for data recording have a much higher information recording density than compact disks for audio, so it is important to ensure that they can be mounted accurately on the spindle of a drive device. A hub made of metal or the like is attached to the center of the disk. Then, a hole in the center of the hub determines the position of the disk, and a magnet attracts the hub to rotate the disk at high speed (1800 rpm or more). Therefore, when attaching the hub to the disk, reading errors will occur if the center of the hub fixed to the spindle and the center of the disk read by optical pickup do not match. equipment is used.

Conventional hub mounting devices photograph the center of the disk using a CCD camera, find the innermost circle of the area where the signal is recorded, and calculate the center position of the disk from this circle. In other words, the reflectance of light is different between a portion of the disk where a signal is recorded and a portion where a signal is not recorded, resulting in a difference in brightness between the two portions in the photographed image.

In this type of hub installation, after aligning the center positions of the optical disk and the hub using a device, the optical disk and the hub are bonded together using a photocurable resin, but conventionally, as shown in Figure 4, the alignment is completed. A photocuring adhesive is applied to the optical disc 15 and the hub 12 in this state, and while the optical disc 15 and the hub 12 are held between the fixing rod 40, curing light (ultraviolet rays) R is irradiated from the upper surface of the hub 12. I try to do that. That is, the optical disk 15 and the hub 12
With the optical disc 15 and the hub 1 stationary, a small-diameter spot light R is irradiated from the upper surface of the hub 12 to the adhesive surface, and the optical disc 15 and the hub 1 are
2 and temporarily adhere. From this state, while rotating the optical disk 15 and hub 12 at low speed, the small diameter spot light R is
was continuously irradiated onto the adhesive surface to bond the entire circumference of the adhesive surface.

(Problem to be Solved by the Invention) However, when attaching a hub, it is difficult to adhere the optical disc and the hub while maintaining their centers, which are aligned using a device.
Temporary adhesion must be performed at at least several points, and for this purpose several ultraviolet irradiation devices must be installed around the optical disk. Sitting force is a problem when attaching a hub not only because it increases the size of the device, but also because the UV irradiation device needs to be separated from the adhesive surface due to interference with the hub fixing rod and other devices, resulting in large energy loss. There was also.

Moreover, according to the conventional bonding method, since the optical disk and the hub are bonded around the entire circumference while rotating, there is a risk that the centers of the optical disk and the hub may shift during rotation.

The present invention has been made in view of the problems of the prior art, and it is an object of the present invention to provide a bonding method that can bond hubs together in a short time without impairing the relative positional accuracy between the disk center and the hub center. shall be.

[Structure of the Invention] Means for Solving Gla) In order to achieve the above-mentioned objective, the method for adhering a hub for an optical disk of the present invention is to adhere a hub to a hole formed in the center of an optical disk using a photocurable adhesive. In the method, the photocurable adhesive is applied to the adhesive surface of one or both of the optical disk and the hub, and the disk and the hub are mounted on a spindle so that the hub is positioned in the hole of the optical disk. After that, the relative positions of the optical disk and the hub are fixed by a hub fixing rod, and then a plurality of lights are simultaneously irradiated onto the adhesive surface of the hub from the upper surface of the hub.

(Function) In the present invention configured as described above, first, with the centers of the optical disk and the hub aligned, a photocurable adhesive is applied to the adhesive surface of either or both of the optical disk and the hub. After the optical disk and the hub are mounted on the spindle so that the hub is positioned in the hole of the optical disk, the relative positions of the optical disk and the hub are fixed by a hub fixing rod. Next, a plurality of lights are simultaneously irradiated onto the adhesive surface of the hub from the upper surface of the hub.

By bonding the hub in this manner, the entire circumference of the bonding surface can be bonded at once without rotating the optical disk and the hub, and there is no risk that the center positions of the optical disk and the hub will shift.

Furthermore, the bonding time can be shortened. Furthermore, hub mounting allows the device to be made more compact.

(Example) Hereinafter, one embodiment of the present invention will be described based on the drawings.

FIG. 1 is a perspective view showing a bonding device using the bonding method of the present invention, FIG. 2 is a longitudinal sectional view showing the same bonding device, and FIG. 3 is a configuration diagram showing the hub attachment device according to the present invention. .

First, before explaining the hub bonding method of the present invention, a hub attaching device for aligning the centers of an optical disk and a hub will be explained.

The hub installation device related to this invention is as shown in Figure 3.
Base 1, spindle 2, drive source 3, rotation angle sensor 4, auxiliary spindle 5, X table 6 and Y table 7,
The actuation means 8, the Y actuation means 9, the optical pickup sensor 10, and the control means 11 are shown on the right.

Spindle 2 The spindle 2 is rotatably supported by the base 1, and the through hole 13 of the knob 12 is located on the axis of the upper end.
A protrusion 14 is formed to be inserted into and engaged with the protrusion 1.
A suction portion 16 for suctioning the optical disk 15 is further formed on the periphery of the optical disc 4 .

A spindle 2 is supported on the base 1 via a bearing 17, and a motor 3, which is a drive source for rotating the spindle 2, is also fixed by a bracket. The motor 3 rotates and stops in response to an operation command signal from the control means 11, and is further equipped with a rotary encoder 4, which is a rotation angle sensor, to detect the rotation angle of the spindle 2, that is, the position in one rotation direction of the spindle 2, Wiring is provided to output this information to the control means 11.

Note that the rotation angle sensor is not limited to the rotary encoder 4, and may be any other means. , it is sufficient if the position of the spindle 2 in the rotational direction can be detected.

Protrusion 1 formed on the upper end of spindle 2 according to this embodiment
4 has a tapered tip, and the outer diameter of the middle portion corresponds to the inner diameter of the through hole 13 of the hub 12 to which it is to be attached. Here, since this hub installation is based on the premise that the device fixes the spindle 2 to the base 1 and at the same time aligns the center of the hub 12 with the rotation center of the spindle 2, in manufacturing and assembling the spindle 2,
It is necessary that the center of rotation of the spindle 20 and the center of rotation of the protrusion 14 coincide with each other with high precision.

Note that the neck portion of the protrusion 14 is formed to have a smaller outer diameter than the middle portion, but this is done in consideration of the fact that the hub 12 is attached to both the front and back surfaces of the optical disc 15, respectively. That is, when attaching the hub 12 to the opposite surface of the optical disc 15 after gluing the knob 12 to one surface,
If the attached knob 12 is not loosely fitted to the protrusion 14, the center of the optical disc 14 on this surface and the hub 12
This is because it is impossible to match the center of the

A suction portion 16 for sucking and fixing the optical disk 15 is formed on the upper edge of the spindle 2. This suction portion 16 is connected to a suction device through a suction hole and a communication hole of the spindle 2 that communicates with the suction hole. (none of which are shown) or the like, the spindle 2 can be rotated while the optical disc 15 is attracted to the attraction part 16.

Auxiliary spindle 5 The auxiliary spindle 5, which is related to this hub installation device, is loosely fitted into the spindle 2 described above with a predetermined gap S2, and is also loosely fitted with a predetermined gap S2 in the axial direction of the spindle 2.
It is attached so that it can be moved up and down with 1.

The auxiliary spindle 5 is composed of a movable part that includes an adsorption part (not shown) and moves up and down relative to the spindle 2, and a fixed part that is located on the outer periphery of this movable part and supports it. The fixed part is further divided into two parts for assembling the moving part. A plurality of seal rings are provided at the interface between the moving part and the fixed part to prevent leakage of drive air, which will be described later. Furthermore, an annular cylinder chamber is formed between the movable part and the fixed part, and when a driving fluid such as air is introduced into this cylinder chamber, the movable part moves downward by SI in FIG. 3 with respect to the fixed part. Then, when the supply of the driving fluid is released, the moving part is again moved upward by SI in FIG. 3 due to the elastic force of the compression spring 27 installed between the spindle 2 and the moving part. Become.

The suction part of the auxiliary spindle 5 is the spindle 2 described above.
However, when the supply of driving fluid to the cylinder chamber is released, that is, when the auxiliary spindle 5 is positioned as far upward as possible with respect to the spindle 2, the auxiliary The suction portion of the spindle 5 is located higher than the suction portion 16 of the spindle 2.

Therefore, when the optical disk 15 is placed on the spindle 2 while the driving fluid is supplied to the cylinder chamber and the auxiliary spindle 5 is moved downward, the optical disk 15 comes into contact only with the suction portion 16 of the spindle 2. On the other hand, when the supply of this driving fluid is stopped, the auxiliary spindle 5 moves upward due to the compression spring 27.
The optical disk 15 that was in contact only with the suction portion 16 of the auxiliary spindle 5 is now transferred so as to be in contact with the suction portion of the auxiliary spindle 5.

X table 6, Y table 7 This hub mounting is related to the device. It is supported via a bearing 31 at. Furthermore, the X table 6 is movable in the X-axis direction, and the Y table 7 is movable in the X-axis direction.
Bearings 32, 33 are provided for axial movement. That is, as shown in FIG. 1, the X-table Fluro supports the fixed part of the auxiliary spindle 5 via a bearing 31, so that when the spindle 2 rotates, the auxiliary spindle 5 also rotates, or the X-table 6 does not rotate relative to the base 1. Also, X table 6
A linear bearing 32 that is slidable in the X-axis direction (direction perpendicular to XfrJiJ in FIG. 3) is interposed between the X table 6 and the Y table 7.
X with the auxiliary spindle 5 supported against the table 7
It can be moved by a gap S2 in the axial direction. moreover,
Between the Y-table 7 and the base 1, there is a linear bearing 33 that is slidable in the Y-axis direction (left-right direction in FIG. 3).
(For convenience, the cross section of the bearing is shown by a dotted line in FIG. 3) is interposed, and from this, the Y table 7 is supported by the X table 6 and the auxiliary spindle 5 with a gap S2 in the Y axis direction relative to the base 1. can only be moved.

These X table 6 and Y table 7 are respectively provided with X actuating means 8 and Y actuating means 9, and these actuating means 8.9 are constituted by servo motors or the like.

The X actuation means 8 is connected only to the X table 6,
A rod 34 (third
In the figure, for convenience L, the rod 34 is shown as a dotted line.

)have. On the other hand, the Y actuating means 9
It has a rod 35 that is connected only to and moves back and forth in the left-right direction in FIG. Furthermore, the operation stop signals to the X actuation means 8 and Y actuation means 9 are wired so as to be output from the control means 11. ° Therefore, when a command signal to move a predetermined amount is output from the control means 11 to the X actuating means 8, since the Y table 7 does not move in the X-axis direction relative to the base 1, only the X table 6 becomes the auxiliary spindle. It moves in the X-axis direction while supporting 5. On the other hand, when a command signal to move a predetermined amount is output from the control means 1 to the Y actuating means 9, the Y table 7 moves in the Y-axis direction relative to the base 1, but at this time, the X table 6 and the auxiliary spindle 5
does not move relative to the Y-table 7 in the Y-axis direction, so the Y-table 7 moves a predetermined amount in the Y-axis direction while supporting the X tape 6 and the auxiliary spindle 5. In this way, the X table 6 and Y table 7 according to the present embodiment have the function of moving the auxiliary spindle 5 by the gap S2 within the XY plane based on the command signal from the control means 11.

Optical Pickup Sensor 10 This hub mounting device is equipped with an optical pickup sensor 10 that reads signals from an optical desk 15, and is fixed to a bracket that moves forward and backward with respect to the base 1 with a cylinder or the like. This is because when installing or taking out the optical disc 15 on the spindle 2, the bracket is moved back and the installation and taking out of the optical disc 15 is facilitated. It is also possible to fix the backup sensor 10 to the base 1.

This optical pickup sensor 10 employs a 3-beam type sensor. That is, pits on which signals are recorded are carved in a circular pattern on the optical disc 15, and a row of pits arranged in the circumferential direction of the optical disc 15 is called a track. The light is focused into a narrow beam and illuminated onto the track to read out the signal.

At this time, the 3-beam optical system used in this embodiment irradiates one pit with three beams:
It is a backup sensor. When the beam shifts from the track it is scanning to the next track, the optical pickup sensor outputs a tracking error signal in the form of a sine wave.
By counting the number of peaks in this signal, it is possible to detect lateral deviation of the track.

However, unless the position of the optical disk 15 in the rotational direction is known, feedback cannot be provided even if the amount of lateral deviation of the track is detected. Therefore, in this embodiment, the optical pickup sensor 10 is scanned by the rotary encoder 4. It is configured to detect the rotation angle (position in the rotation direction) of the optical disc 15.

Further, it is preferable that the optical pickup sensor 10 according to this embodiment operates as close to the outer periphery of the optical disc as possible. This is because the amount of lateral deviation of the track is most amplified and detected.

Incidentally, the detection signal of the pickup sensor 10 is outputted to the control means 11, and the amount of lateral deviation of the truck is calculated by the control means 11.

Control Means 11 The control means 11 according to the present embodiment performs calculations to decompose the lateral shift signal detected by the optical pickup sensor 10 described above into the XY-axis directions. At this time, a rotation angle sensor (rotary encoder) provided on the motor 3 that is the drive source
By confirming the position of the optical disc in the XY plane based on the signal No. 4, the lateral shift signal is resolved into the XY axis directions.

The decomposed calculation results are outputted to the X actuation means 8 and the Y actuation means 9, respectively, thereby moving the X table 6 and the Y table 7, respectively.

When attaching a hub configured in this way to a device, first of all,
The optical disk 15 is placed on the suction portion 16 of the spindle 2, and the hub 12 is positioned in the hole 38 of the optical disk 15 and inserted into the hole 14 protruding from the through hole 13 of the hub 12. Then, a suction device (not shown) is activated to hold the optical disk 15 on the suction portion 16, and then the motor 3 is activated to rotate the spindle 2 once.

Next, the optical pickup sensor 10 picks up the optical disc 1.
The control means 11 detects the lateral deviation of the track No. 5 and sends this signal to the control means 11.
Output to. At the same time, the rotation angle of the spindle 2 is detected by the rotation angle sensor 4 and outputted to the control means 11. When the input of the predetermined data is completed, the motor 3 is stopped, and the signal from the optical pickup sensor 10 is calculated within the control means 11 as lateral deviation data with respect to the rotation angle of the spindle 2. The result of this calculation is 1 of the ψ center of the optical disk and 7
If the deviation amount is within the allowable range, the operation is terminated, but if it is outside the allowable range, the X component and Y component of the deviation amount are output to the X actuating means 8 and Y actuating means 9, respectively. Thereby, the auxiliary spindle 5 is moved by a predetermined amount by the X table 6 and the Y table 7 while the spindle 2 is fixed to the base 1.

This operation is repeated a preset number of times a, and if it still cannot be set within the allowable range, the operator is prompted by a display or the like.

Next, the above-mentioned hub attachment is carried out after aligning the centers of the optical disk 15 and the hub 12 with the device.
A method of bonding the hub 12 and the hub 12 will be explained.

1 and 2 are a perspective view and a sectional view showing a bonding device using the bonding method according to the present invention, and as shown in FIG. It is disposed at the upper part and has a fixing rod 40 and a sleeve 41 loosely fitted onto the fixing rod 40. These fixed rods 40
The sleeve 41 is provided so as to be movable up and down with respect to the optical disk 15 mounted on the spindle 2 and the hub 12. As shown in FIG. 2, the tip of the fixing rod 40 is formed with a recess 42 so as not to interfere with the protrusion 14 of the spindle 2, and cooperates with the spindle 2 to clamp and fix the disk 15 and the hub 12. ing. This fixed rod 4
A plurality of quartz fibers 43 are provided on the sleeve 41 that is loosely fitted into the sleeve 41, and the base ends of the quartz fibers 43 are connected to an ultraviolet irradiation device (not shown). On the other hand, the tips of the quartz fibers 43 are fixed at substantially equal intervals in the circumferential direction at the tip of the sleeve 41, so that the entire circumference of the adhesive surface 44 of the knob 12 can be irradiated with ultraviolet rays at once.

Note that the fixing rod 40 and the sleeve 41 may be fixed to each other, but it is necessary to attach the fixing rod 40 so that the tip of the fixing rod 40 slightly protrudes from the tip of the sleeve 41.
It is preferable to adjust the pressing force when the tip of the fixing rod 40 presses the knob 12 by attaching an elastic member such as a spring to the knob 12.

Next, the operation of this embodiment will be explained.

In this embodiment configured in this way, the optical disc 1
5 and the hub 12, first apply a photocurable adhesive to the adhesive surface 44 of either or both of the optical disc 15 and the knob 12, and then attach the optical disc 15 and the hub 12. is mounted on the spindle 2 so that the hub 12 is positioned in the hole 38 of the optical disc 15, and then the relative positions of the optical disc 15 and the hub 12 are fixed by a hub fixing rod 40.

Next, a plurality of lights are simultaneously irradiated from the upper surface of the hub 12 onto the adhesive surface 44 of the hub 12 using the quartz fiber 43 .

By bonding the hub 12 to the optical disc 15 in this manner, the entire circumference of the adhesive surface 44 can be bonded at once without rotating the optical disc 15 and the hub 12, which eliminates the possibility that the center positions of the optical disc 15 and the hub 12 may shift. There is no such thing. In addition, the adhesion time can be shortened, and the sleeve 4
1 is configured to be loosely fitted onto the fixed rod 40, the hub attachment can reduce the size of the device.

[Effects of the Invention] As described above, according to the present invention, since the optical disc and the hub are fixed with their centers aligned, and light is irradiated simultaneously over the entire circumference of their adhesive surfaces, The hub can be bonded in a short time without impairing the relative positional accuracy between the optical disk and the hub.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing an adhesive bag type using the adhesion method of the present invention, Fig. 2 is a longitudinal sectional view showing the same adhesion device, and Fig. 3 is a configuration showing the installation device according to the present invention. 4 are perspective views showing a conventional hub bonding method. 1. Base, 2. Spindle, 3.
...Motor (drive source), 4...Rotary encoder (rotation angle sensor), 5...
・Auxiliary spindle, 6...X table, 7...Y
Table, 8...X actuation means, 9...Y actuation means, 10...Optical pickup sensor, 11...Control means, 12...Knob 13
...Through hole, 14...Protrusion, 15...Optical disk, 16...Adsorption part, 38...Hole, 40...Fixing rod, 43...Quartz fiber s,, s2...・Dose line. 41...Sleeve,

Claims (1)

[Claims] A method of bonding a hub (12) to a hole (38) formed in the center of an optical disk (15) using a photocurable adhesive, comprising: either the optical disk (15) or the hub (12); The photocurable adhesive is applied to one or both adhesive surfaces (44), and the optical disc (15) and hub (12) are connected so that the hub (12) is located in the hole (38) of the optical disc (15). After mounting the optical disc (15) and the hub (12) on the spindle (2) as shown in FIG.
) A method for bonding an optical disk hub, characterized in that a plurality of lights are simultaneously irradiated onto the bonding surface (44) from the top surface of the disk.