JPH02146158A - Hub bonding device for information storage medium - Google Patents

Abstract

PURPOSE:To prevent the deformation of a substrate due to the pressure of an information storage medium by providing a means to back up the substrate when the pressure of a hub is held. CONSTITUTION:When a hub does not exist on the underside of an optical disk 13, a slider 24 is advanced by an air cylinder 25, a backup 26 is lifted by the thickness of a hub flange, and the underside of the optical disk 13 is received by the backup 26. On the other hand, when the hub is bonded to the underside of the optical disk 13, the air cylinder 25 is not operated, and the edge surface of the hub is received by the backup 26. In such a constitution, when the hub is pressured by a pressuring substance, since a backup means 22 supports the optical disk 13, the deformation due to the warp of the optical disk 13 can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a hub bonding device for an information storage medium that concentrically bonds a hub to an information storage medium such as an optical disk, for example.

(Prior Art) When the center of rotation of an optical disc and the recording groove of the optical disc are eccentric, a tracking error may occur when recording and reproducing information.

Recently, in order to prevent this tracking error, the boss of the hub is fitted into the through hole provided in the center of the optical disc.
The center of the insertion hole provided in this hub is made to coincide with the center of the recording groove.

By the way, the hub is bonded by a hub bonding device 1 as shown in FIG. This hub bonding device 1 includes a jig 3 on which an optical disc 2 is placed, a holder 4 provided above the jig 3 so as to be movable up and down, and a centering shaft provided at the bottom of the holder 4. 5 and a presser glass 6.

When the hub 7 is to be bonded, first, a photocurable adhesive is applied to the hub attachment position of the optical disk 2 placed on the jig 3, and the hub 7 is placed a on top of the photocurable adhesive. From this state, the holder 4 is lowered, and the tip of the centering shaft 5 is inserted into the insertion hole 7a of the hub 7 for centering, and is pressed and held by a presser glass (presser) 6. Thereafter, the photocurable adhesive is irradiated with ultraviolet rays through a holding glass 6 using an optical fiber (not shown). As a result, the adhesive is cured and the hub 7 is fixed to the optical disc 2.

(Problem to be solved by the invention "8") However, in the past, the hub 7 was held down and the glass 6
When pressed, the disk 2 was warped as shown in FIG.

As a result, the contact area between the adhesive surfaces of the disk 2 and the hub 7 is reduced, resulting in a decrease in adhesive strength, and the disk 2 also remains warped, resulting in poor product characteristics.

The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to provide an information storage medium to which a hub can be bonded without deforming the information storage medium when the pressing body presses and holds the hub. The present invention aims to provide a one-piece adhesive device.

[Structure of the Invention] (Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention presses and holds a knob in the center of a substrate of an information storage medium using a pressing body, and presses and holds this held hub. The bonding/X-bonding apparatus is characterized in that it includes a backup means for backing up the substrate when the hub is pressed and held.

(Function) The above means prevents the substrate from being deformed even when the hub is pressed by the pressing body.

(Embodiment) The present invention will be described below with reference to an embodiment shown in FIGS. 1 to 6.

In FIG. 2, the centering XY table 11 is movable in the left-right direction in the drawing and in the direction orthogonal to the plane of the paper. This centering X-Y table 11 has a jig 12.
is provided. An optical disk 13 as a base is placed on this jig 12, and this optical disk 13 is placed on the jig 12.
The jig 12 is removed by a vacuum device (not shown) provided in the
In this state, it is moved by the centering XY table 11.

Above the jig 12, there is a CCD camera 1 as a reading means facing the optical disk 13 attracted to the jig 12.
4 is provided. These CCD cameras 14
As shown in the figure, for example, four CCD cameras are arranged at equal intervals around the periphery of the optical disk 13, and these CCD cameras 14 detect the recording grooves shown in FIG. Thus, the recording groove 13a located on the outer periphery of the optical disc 13 is read.

A read signal output from each CCD camera 14 is supplied to a control circuit 15. This control circuit 15 uses a driving means (not shown) to align the center of the recording groove 13a of the optical disk 13 with the predetermined centers (reference positions) of the four CCD cameras 14 based on the manually inputted reading signal. Through,
The centering XY table 11 is moved. That is, the centering XY table 11 is moved so that the outermost recording groove 13b of the optical disk 13 is at the same position within the field of view of each CCD camera 14, for example.

On the other hand, a holder 16 is provided at the center of the four CCD cameras 14. This holder 16 is movable in the direction toward and away from the jig 12 by the control means 15 and a drive means (not shown). A centering shaft 17 is provided at the distal end of the holder 16, and is inserted into a hub 18 attached to the optical disc 13 at the distal end of the centering shaft 17.

Furthermore, a holding glass 19 as a pressing body is provided at the center of the centering shaft 17 in the axial direction.

This holding glass 19 is used to hold the hub 1 against the optical disc 13.
The hub 18 is fixed to the optical disk 13 in a state in which the centering of the hub 8 has been performed, and is made of a material that transmits ultraviolet rays. Tips of optical fibers 20 are disposed at four locations around the holding glass 19, for example. These optical fibers 20 guide ultraviolet rays to cure the ultraviolet curable adhesive applied between the hub 18 and the optical disk 13 via the holding glass 19.

FIG. 3 shows the relationship between the optical disc 13 and the hub 18.

A through hole 13c is provided in the center of the optical disc 13. Further, the centering shaft 17 is inserted into the hub 18,
An insertion hole 17a having approximately the same diameter as the centering shaft 17 is provided, and a boss 18b is provided around the insertion hole 18. The diameter D1 of the boss 18b is slightly smaller than the diameter D2 of the through hole 13C of the optical disc 13, and the hub 18 is movable relative to the through hole 13c of the optical disc 13. Further, this hub 18 is also made of a material that transmits ultraviolet rays. Furthermore, a photocurable adhesive 21 is applied between the optical disk 13 and the hub 18.

By the way, inside the jig 12, as shown in FIG. 1, a backup means 22 is provided. This backup means 22 includes a slider 24 having a tapered surface 23 on its upper surface, and this slider 24 is connected to an air cylinder 25.
It is designed to be operated by

Further, a backup 26 is placed on the tapered surface 23 of the slider 24, and the backup 26 moves up and down as the slider 24 advances and retreats.

Next, a method for attaching the hub 18 will be explained.

First, with the optical disc 13 adsorbed on the jig 12, before supplying the hub 18 to the top surface of the disc 13, a reflective optical fiber sensor is used to check whether the hub 18 is on the bottom surface of the disc 13, as shown in FIG. Automatically detected by 27. Therefore, initially, the backup 26 is always in the lowered state, that is, the state shown in FIG. 5.

Also, when there is no hub 18 on the bottom surface of the optical disc 13,
The slider 24 is advanced by the air cylinder 25 to raise the backup 26 by the thickness of the brim of the hub 18, so that the backup 26 receives the lower surface of the optical disk 13.

At this time, the dimensions are such that the lower surface of the optical disk 13 is slightly higher than the upper surface of the jig 12.

On the other hand, when the hub 18 is already bonded to the lower surface of the optical disk 13, the air cylinder 25 does not operate and the end surface of the hub 18 is received by the backup 26. At this time, the dimensions are such that the lower surface of the optical disk 13 is slightly higher than the upper surface of the jig 12, as described above.

After that, the hub 18 of the optical disc 13 is attached to the position,
That is, a photocurable adhesive 21 is applied around the through hole 13c using a dispenser (not shown), and the hub 18 is placed thereon as shown in FIG. 1 or FIG. 5. In this state, the hub 18 is movable relative to the optical disc 13.

After that, the optical disc 1 is read by four CCD cameras 14.
The centering XY table 11 is moved in accordance with the read output, and the center of the recording groove 13b is aligned with the center of the four CCD cameras 14.

Next, the holder 16 is lowered, and the tip of the centering shaft 17 is inserted into the insertion hole 18a of the hub 18.

At this time, since the tip of the centering shaft 17 is tipped, the axis of the centering shaft 17 and the insertion hole 18a of the hub 18
If the center of the centering shaft 17 is misaligned, as the centering shaft 17 is inserted into the insertion hole 18a of the hub 18, the hub 18 moves to the center of the recording groove 13a of the optical disc 13, and the centering shaft 17 is completely inserted, and the hub 18 is moved to the center position, and the presser glass 19 presses and holds that position.

At this time, in the case of FIG. 1, the optical disk 13 is directly supported by the backup 26, and in the case of FIG.
The optical disc 13 is indirectly supported through the optical disc 8 to prevent deformation of the optical disc 13.

After positioning the hub 18 as described above, the ultraviolet rays guided by the optical fiber 20 are
When the photocurable adhesive 21 is irradiated through the beam 9, the adhesive 21 is cured and the hub 18 is fixed to the optical disk 13.

Thereafter, the hub 18 is attached to the back surface of the optical disc 13 in the same manner as described above.

As described above, when the hub 18 is pressed by the presser glass 19, the backup 26 directly or indirectly supports the optical disc 13, which prevents it from warping, increases the contact area between the hub 18 and the optical disc 13, and improves adhesive strength. can be improved.

Furthermore, deformation due to warping of the optical disc 13 is eliminated, and product characteristics can also be improved.

Furthermore, since the vertical mechanism of the back-absorbing means 22 employs a wedge type, the structure is such that it can withstand a considerable pressing force even though the power required to raise and lower it is small.

In the above embodiments, an optical disk is used as the information storage medium, but the present invention is not limited to this, and the present invention can also be applied to, for example, a floppy disk.

It goes without saying that various other modifications can be made without departing from the gist of the invention.

[Effects of the Invention] As described above, according to the present invention, since the information storage medium is supported by the backup means when the pressing body presses the hub, it is possible to prevent the information storage medium from warping. Therefore, the contact area between the hub and the information storage medium is increased, and the adhesive strength can be improved.

Further, deformation due to warpage of the information storage medium is eliminated, and product characteristics can also be improved.

[Brief explanation of the drawing]

1 to 6 show an embodiment of the present invention, FIG. 1 is a schematic configuration diagram showing a backup mechanism, and FIG. 2 shows an embodiment of a centripetal bonding device for a recording medium hub. 3 is a side sectional view showing the relationship between the optical disk and the hub, FIG. 4 is a plan view showing the relationship between the optical disk and the camera, FIG. 5 is an explanatory diagram showing the operation of the backup mechanism, and FIG. 6 is a side sectional view showing the relationship between the optical disk and the hub. FIG. 7 is a block diagram showing a hub detection mechanism, FIG. 7 is a block diagram showing a conventional hub bonding device, and FIG. 8 is an explanatory diagram showing warping of an optical disk when the hub is suppressed. 13... Optical disk (base) 18... Hub, 19
... Presser glass (pressing body), 22... Backup means. Applicant's agent Patent attorney Takehiko Suzue Figure 1 Figure 2 Figure 3 - Degu

Claims (1)

[Claims] A hub bonding device for pressing and holding a hub against the center of a substrate of an information storage medium by a pressing body and bonding the held hub, characterized by comprising a backup means for backing up the substrate when the hub is pressed and held. Hub adhesive device for information storage media.