JPH0568786B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an apparatus for adhering a hub made of a light-shielding material to an optical disc, which is used when manufacturing an optical disc.

[Prior technology] Some of the DRAW type optical disks currently in practical use include those that simply have two substrates glued together, and those that have a structure in which a space is interposed between the two substrates. There are those with a Sanderutsch structure.

Figure 2 is a cross-sectional view schematically showing an optical disk with an air sandwich structure, which has the most practical examples.
0 is an optical disk, 1a and 1b are substrates for recording information, 2a and 2b are an inner spacer and an outer spacer interposed between these substrates 1a and 1b, and the space between the inner spacer 2a and the outer spacer 2b. Information is recorded on the inner surface of each substrate 1a, 1b facing the part. In addition, 3a and 3b are optical disks 1
The hubs are bonded to both sides of the central portion of the hub 3a, 3b, and suction plates 4a, 4b made of metal plates are provided inside or on the surfaces of the hubs 3a, 3b, respectively.
5 is a clamp for rotating the optical disk 10 configured as described above, 5' is a protrusion at the tip of the shaft of this clamp, and rotates with this protrusion 5' protruding into the optical disk 10 from inside the hub 3b; Reference numeral 6 denotes a magnet that attracts the suction plate 4b in order to correctly transmit the rotation of the axis of the clamp 5 to the optical disk 10.

The optical disk 10 shown in FIG. 2 has an air sandwich structure and is of a write-once type (DRAW: Direct Read after
Write). Its structure is based on the opposing inner surfaces of substrate 1a and substrate 1b, which are bonded together with adhesive.
A film of Te-based material or the like is applied, and digital recording is performed using a laser on the inner surface of the area where the spacers 2a and 2b are not present. Specifically, we use a laser to create several types of pits (holes or irregularities).
is created, and this pit arrangement is read as information.

FIG. 3a is a diagram schematically showing the main parts for reading the write-once optical disc 10, in which the lens 7
1A shows a state in which an optical pickup 7 consisting of a laser light source 7b and a reading mechanism 7c reads information from each track 8 of a rotating optical disk 10. Also,
FIG. 3b is a detailed perspective view of the track 8 in FIG. 3a, and 9 is a pit representing information.

When the optical disk 10 is rotated as shown in FIGS. 3a and 3b, the track 8 itself may not draw a correct circular shape with respect to the center (it is eccentric), or the center of the optical disk 10 and the center of rotation may be misaligned. In some cases, there may be rotational fluctuation of the track used for reading or writing due to reasons such as uneven rotation caused by insufficient precision of the rotation mechanism of the optical disk 10.

There is an international standard for optical disks, and according to that standard, the magnetic clamp method has recently been adopted. The same standard also stipulates that the same track 8 can be tracked by controlling the optical pickup 7 for rotational runout that is less than a certain tolerance range (50 μm), even for rotational runout caused by the above-mentioned vibrations. It has been agreed that this will be done.

In addition, as a next-generation optical disk, we have introduced an rewritable type (EDRAW: Erasable Direct Read After).
Write) has been announced, and this EDRAW
Standardization work is also progressing for optical discs based on international standards.

This EDRAW type optical disk has the greatest advantage of being erasable and rewritable, and is expected to be put to practical use as a storage device for computer programs and data. When optical disks are put into practical use as a replacement for magnetic disks for word processors, for example, their dimensions tend to become smaller, such as 3.5 inches.

According to recently agreed upon international standards, the hub in the above-mentioned magnetic clamp method was one in which the metal plate attracted by the magnet was covered with a transparent resin, etc., but as optical disks became smaller. Accordingly, one metal plate is simply attached directly to the optical disk.

FIG. 4 is an explanatory diagram showing a state in which a metal hub is bonded to an optical disk, where 20 is an optical disk, 21 is an adhesive, and 22 is a hub made of stainless steel.

In addition to the metal material, a hub in which thin metal pieces are embedded in colored resin may also be used as the hub in the magnetic clamp method.

[Problems to be Solved by the Invention] Here, when bonding a hub made of a light-shielding material such as metal or colored resin to an optical disk, it is necessary to adhere the hub made of a light-shielding material such as metal or colored resin to an optical disk using a light-curing adhesive coated with a light-curing adhesive. It is not possible to place the hub made of the above-mentioned light-shielding material on the disk and harden the adhesive by irradiating it with light to bond it. In other words, when irradiating light onto an optical disk on which a hub made of a light-shielding material such as metal is mounted, the hub itself is light-shielding, so the light is irradiated from the side on which the hub is mounted. However, it is impossible to irradiate the photocurable adhesive applied to the adhesive surface between the optical disk and the hub. Therefore, it is conceivable to irradiate light from the side opposite to the side on which the hub is placed, but on the side opposite to the side on which the hub is placed there is an X for positioning and fixing the optical disk. - Since a Y-axis movement mechanism and a positioning mechanism are present, it is difficult to provide a light irradiation mechanism for drying and curing the photocurable adhesive.

This invention was made to solve this problem, and when a hub made of a light-shielding material is bonded to an optical disk, light can be effectively irradiated onto the photocurable resin existing on the bonding surface. The object of the present invention is to provide an adhesive device for a disk hub.

[Means for Solving the Problems] In order to achieve the above object, an optical disk hub adhesion device made of a light-shielding material according to the present invention is provided, on which an optical disk coated with a photocurable adhesive is placed. It has a stage and a hub mounting and pressing mechanism that places and presses an optical disc hub made of a light-shielding material at a predetermined position on the optical disc, and inside the stage there is a light-curing adhesive that reflects light. A light irradiation mechanism is provided to irradiate the light-curing adhesive from the side opposite to the stage across the optical disk, through the reflector or reflection surface. It is something.

[Function] With the above configuration, it is possible to effectively irradiate the photocurable resin present on the adhesive surface of the hub made of a light-shielding material with light.

[Example] Figure 1a is a cross-sectional view schematically showing the main parts of a bonding device for an optical disk hub made of a light-shielding material as an embodiment of the present invention, and Figure 1b is a schematic cross-sectional view of the bonding device of Figure 1a. FIG. 2 is an explanatory diagram illustrating a state in which an optical disc hub made of a light-shielding material is adhered to an optical disc using the optical disc.

In FIG. 1, 20A is a hole in the center of the optical disk 20, 22 is an optical disk hub (hereinafter referred to as hub) made of metal such as stainless steel, which is a light-shielding material, and 23 is an optical disk that is fitted into the hole 20A. A glass plate made of quartz that transmits light, 24 is a reflective surface made of vapor-deposited aluminum on the back surface of this glass plate 23, and 25 is a magnetically held and released hub 22 on the optical disc 20 coated with a photocurable adhesive 21. a head for placing and further pressing; 26;
27 is a stage for mounting and positioning the optical disk 20; 28 is a drive system for driving the head 25; 28 is a stage 28 for vacuum suctioning the optical disk 20 placed on the top surface of the stage 27; A hole communicating with the vacuum pump, 29 a guide pin for receiving the hub 22 descending from the head 25 and guiding it to the central hole of the optical disk 20, 30 interposed between the guide pin 29 and the rotating shaft 31. 31 is a rotation shaft for rotating the optical disk 20;
32 rotates this rotating shaft 31 and rotates the stage 2.
A stage drive mechanism 33 is a stage drive mechanism for moving the stage 7 for positioning, and 33 is a light guide fiber that guides light from a light source, and is arranged at three locations at approximately equal intervals.
Note that the same reference numerals as in FIG. 4 indicate the same or corresponding parts.

In the apparatus shown in FIG. 1, the positioning of the optical disk 20 is performed as follows. That is, an optical pickup similar to an optical disk drive device is placed on a stage 27 (not shown), and the stage 27 is rotated to cause the optical pickup to follow the track of the optical disk 20 in the same way as the drive device. The center of the disk 27 is detected, and based on the detection result, the stage drive mechanism 32 operates to drive the stage 27 so that the center of the optical disk 20 is at a predetermined position. The predetermined position is a position whose origin is the center of the optical disk 20, and is a position that coincides with the center of the hub 22 on which it is placed.

In addition, the innermost track of the optical disk 20 adsorbed to the vacuum suction hole 28 on the stage 27 is detected by a CCD camera (not shown), and the optical disk 20 is
The intersection point between the bisector of a line segment connecting any two points on the circumference and the bisector of a line segment connecting any other two points on the circumference is determined by image processing and Alternatively, the center position of the disk substrate may be detected.

Photocurable adhesive 21 positioned at a predetermined position
The center of the hub 22, which is lowered from the top and placed on the optical disk 20 coated with the same material, is aligned with the center of the optical disk 20 by the operation of the head drive system 26. Therefore, the guide pin 29 of the lowered hub 22 is lowered by the pressure of the head drive system 26 against the force of the spring 30, and the hub 22 is pushed into the hole 20A at the center of the optical disk 20. Then, the hub 22 is fitted into the hole 20A of the optical disk 20 and is irradiated with light from the plurality of light guide fibers 33 while being pressed by the head 25. The light from the light guide fiber 33 enters the glass plate 23 made of quartz, is reflected by the reflective surface 24 on the back side of the glass plate 23, and the reflected light is irradiated onto the adhesive surface between the hub 22 and the optical disk 20. The hub 22 is temporarily attached. Next, the rotary shaft 31 is rotated by the operation of the stage drive mechanism 32, and while the stage 27 and the optical disk 20 on the stage are rotated, light is further irradiated to perform main bonding. After the adhesion process is completed, the vacuum suction of the optical disk 20 is released and the optical disk 20 is placed on the stage 27.
The next optical disk 20 is placed on the stage 27 and subjected to the same process.

In the above embodiment, since light is irradiated for temporary adhesion while the hub 22 is pressed by the head 25, the accuracy of positioning is not impaired. In addition, since it has a mechanism for rotating the disk 20, the hub 2
Not only the temporary adhesion (2) but also the actual adhesion can be performed simultaneously at the same location, making the apparatus compact.

In addition, many of the photocurable adhesives 21 are cured by being exposed to light with a wavelength of 365 nm, so for example,
When curing by irradiating light with a wavelength of 365 nm, quartz glass having high transmittance for light with a wavelength of 365 nm is effective as the glass plate 23.

Furthermore, the stage 27 can be used without using the glass plate 23.
Although a reflective surface may be applied directly to the optical disk 20,
For example, if the thickness is about 1.2 mm, stage 2
Even if the light is reflected in step 7, the adhesive cannot be properly irradiated with light, so the reflecting plate may be provided by being shifted downward from the mounting surface of the optical disk 20.

Also, the reflective surface may be a vapor-deposited film such as aluminum,
Alternatively, a metal plate may simply be attached.

In the above embodiment, the hub 22 is made of stainless steel, but the present invention can be applied to hubs made of any light-shielding material, including metals other than stainless steel or materials such as colored resin. be able to.

[Effects of the Invention] As explained above, the adhesive device of the present invention has the following effects:
It has a stage on which an optical disk coated with a photocurable adhesive is placed, and a hub mounting and pressing mechanism that places and presses an optical disk hub made of a light-shielding material at a predetermined position on the optical disk. A reflecting plate or a reflecting surface is provided in the stage to reflect and irradiate light onto the photocurable adhesive, and light is applied from the opposite side of the stage across the optical disk through the reflecting plate or reflecting surface. By providing a light irradiation mechanism that irradiates the photocurable adhesive with light, the hub made of the light-shielding material can be easily bonded with a simple configuration. Further, changes in the structure of the stage portion to obtain the structure of the present invention require only minimal changes, and therefore the cost of the entire apparatus is low.

[Brief explanation of the drawing]

FIG. 1a is a cross-sectional view schematically showing the main parts of a bonding device for an optical disk hub made of a light-shielding material as an embodiment of the present invention, and FIG. An explanatory diagram illustrating a state in which an optical disk hub made of a light-shielding material is adhered to the
Fig. 2 is a cross-sectional view schematically showing an optical disk with an air sandwich structure, which has the most practical examples, and Fig. 3a is a view schematically showing the main parts for reading a write-once type optical disk. FIG. 4B is a detailed perspective view of the track portion of FIG. In the figure, 20... optical disk, 21... photo curing adhesive, 22... hub, 23... glass plate, 24
... Reflective surface, 25 ... Head, 27 ... Stage, 33 ... Light guide fiber.

Claims (1)

[Claims] 1 In an adhesive device for an optical disk hub made of a light-shielding material that optically adheres an optical disk hub made of a light-shielding material to a predetermined position on the optical disk via a photocurable adhesive, the light-curable adhesive is applied. The stage includes a stage on which the optical disk is placed, and a hub placement and pressing mechanism that places and presses an optical disk hub made of a light-shielding material at a predetermined position on the optical disk, and the stage includes: A reflective plate or reflective surface that reflects and irradiates light is provided on the photocurable adhesive,
From the opposite side of the stage across the optical disc,
1. A bonding device for an optical disk hub made of a light-shielding material, comprising a light irradiation mechanism for irradiating light onto a photocurable adhesive through the reflecting plate or reflective surface.