JPH03245332A - Method for working outer peripheral surface of disk - Google Patents

Abstract

PURPOSE:To improve the durability of cutting tools and to obviate the generation of cracks in the base material and signal recording layer of a disk by cutting the outer peripheral end face of the disk by means of the 1st cutting tool having a straight blade part and cutting both side edges of the outer peripheral end face by means of the 2nd cutting tool having an blade part formed with a recessed part. CONSTITUTION:The outer peripheral end face of the disk 102 is cut by the cutting tool 9 having the straight blade part and both side edges are cut by the 2nd cutting tool 10 having the blade part formed with the recessed part. Since the respective cutting tools 9, 10 to be used in this way are simple in the shape of the respective blade parts and, therefore, the formation is simple and the durability is good. Since the shapes of the blade parts of the respective cutting tools 9, 10 are well maintained, the cutting is executable without generating cracks in the base material and signal recording layer, etc., of the disk.

Description

DETAILED DESCRIPTION OF THE INVENTION A. Field of Industrial Application The present invention relates to a method for processing the outer circumferential surface of a disk in the manufacturing process of a disk such as an optical disk.

B1 Summary of the Invention The present invention relates to a method for processing the outer circumferential surface of a disk for making the outer circumferential surface of the disk a predetermined outer diameter dimension and chamfering the outer edge in the manufacturing process of a disk such as an optical disk. A rotation operation is performed to cut the outer circumferential end face of the disk with a first cutting tool having a linear blade, and then cutting both side edges of the outer peripheral end face with a second cutting tool having a cutting edge with a recessed part. This makes it possible to use a tool with good durability, and also prevents the disk from becoming cranked.

C9 Conventional technology Conventionally, using an optical big amplifier device and a magnetic head,
Alternatively, an optical disc has been proposed in which an information signal is written by means such as molding, and the information signal can be read using an optical pickup device.

This optical disk includes a disk base material formed into a disk shape of synthetic resin material such as polycarbonate, acrylic resin, or epoxy resin, or glass, and a magnetic material etc. on the main surface of the disk base material. and a signal recording layer formed from.

In such optical discs, as shown in FIG. 10, there is a double-sided optical disc 102 in which information signals can be written and/or read on both sides by pasting together a pair of optical discs 1ola and 101b. Proposed. The double-sided optical disks 102 are bonded together such that the signal recording surface side, which is the front side of the -1-registered optical disks 101a and 101b, faces outward, that is, their back sides are glued together.

In such a double-sided optical disc 102 formed by laminating a pair of optical discs Iota and 101b, each of the optical discs 101a and 101b has a spiral shape formed approximately concentrically on the respective signal recording layer. They are pasted together so that the center positions of the recording tracks are aligned. Therefore, each of the optical discs 101a, 10
1b are pasted together, these disks 101
The outer periphery of a101b may not match.

Therefore, in order to make the outer diameter/J method of the double-sided optical disc 102 a predetermined value, each of the optical discs 101a, 10
After bonding 1b, the outer peripheral surface is cut to be flat.

Further, - the circumferential surface of the double-sided optical disc 102 is cut after being subjected to the above-mentioned cutting process to prevent the occurrence of cracks from both side edges of the circumferential surface, and to make the both side edges sharp.

In order to prevent handling hazards due to the advantageous corners, so-called "cutting" is applied to the edges on both sides.

D0 Problems to be Solved by the Invention By the way, in manufacturing the double-sided optical disc 102 as described above, the optical discs 101 bonded together
As shown in FIG. 11, the hide used for cutting the outer peripheral portions of the double-sided optical disc 102 has a flat blade portion 110a that cuts the outer peripheral surface of the double-sided optical disc 102 flatly, and a so-called The blade part 110 has a pair of slanted blade parts 110b, 110b for cutting in a chamfering manner. 1. The flat blade portion 110a is parallel to the rotation axis of the double-sided optical disc 102. The pair of inclined blade parts 110b, 110b are connected to the flat blade part 1.
It is formed to be inclined so as to protrude toward the double-sided optical disc 102 from both sides of the disc 10a.

A cutting tool equipped with such a blade part 110 is difficult to make, has low durability, and is used for a large number of double-sided optical discs 10.
It is difficult to process 2 continuously.

Furthermore, when the outer peripheral part of the double-sided optical disc 102 is processed using a cutting tool equipped with such a blade part 110, especially when the blade part 110 is worn, the disc constituting the double-sided optical disc 102 will be damaged. Cracks are likely to occur in the base material and signal recording layer. If a crank occurs in the disk base material or the signal recording layer, it becomes impossible to write and/or read information signals into and/or from the signal recording layer.

In addition, the crank of the signal recording layer causes rust in the signal recording layer when the signal recording U layer includes a metal material.

Therefore, the present invention is proposed in view of the above-mentioned circumstances, and can improve the durability of the cutting tool and prevent cracking and scratches from occurring in the disc base material and the signal recording layer. The purpose is to provide a method for machining circular surfaces.

Step f to solve the E0 problem In order to solve the above-mentioned problem and achieve the above object, the method for processing the outer circumferential surface of a disk according to the present invention involves rotating the disk and cutting the outer circumference of the disk with a linear blade. the first having a part
Then, both side edges of the outer circumferential end face are cut with a second cutting tool having a four-part cutting edge.

F1 action The deflector according to the present invention (in the peripheral surface processing method,
The outer circumferential end surface of the disk is cut by a first cutting tool having a straight cutting edge, and then both side edges are cut by a second hide having a cutting edge with a recess formed therein.

G. Examples Specific examples of the present invention will be described below with reference to the drawings.

Disks manufactured using the method for processing the outer peripheral surface of a disk according to the present invention include, for example, a pair of optical disks 101a as shown in FIG. 10 above.

This is a so-called double-sided optical disc in which the discs 101b are pasted together so that information signals can be written and/or read on both sides. This double-sided optical disc 102
The optical discs 101a and 101b are bonded to each other with an adhesive 103 so that the signal recording surface side, which is the front side, faces outward, that is, the back sides of each optical disc 101a and 101b are bonded together with an adhesive 103.

Each of the optical discs 101a and 101b is a disc configured to be able to write information signals, and is made of a synthetic resin material such as polycarbonate, acrylic resin, or epoxy resin, or a disc-shaped disc made of glass. It has a disk base material formed thereon, and a signal recording layer formed from a magnetic material or the like on the main surface of this disk base material. This signal recording layer is used for these optical discs 10
It is formed on the back side of 1a and 101b. That is,
Information signals are written to and/or read from the signal recording layer from the surface side of these optical discs 101a, 101b through the disc base material.

Disk hubs 104 and 104 are fixed to the disk base materials of these optical disks IO]a, , 101b, respectively. These disk hubs 104, 104 are intended to be chaffed by a disk device that writes and/or reads information signals on this double-sided optical disk 102, and are attached to the central portion of the surface side of the disk base material, respectively. It is being This day, Sukhhab 1
The 04° 104 is made of a rigid material such as metal and has a substantially disk shape, and has a center hole 104a in the center thereof, which is used when chucked by the disk device.

Hereinafter, a procedure for manufacturing the above-mentioned double-sided optical disc using the method for processing the outer peripheral surface of a disc according to the present invention will be explained.

To manufacture the double-sided optical disc, first, as shown in FIG. 1, a pair of optical discs 101a are manufactured.

101b are placed on the moving table 1 in parallel. These optical disks 10], , a, and 101b are placed on the movable table 1 with the back side, which is the side on which the signal recording layer is formed, facing upward. Further, the moving table 1 includes each of the optical discs 1o1a,
A plurality of suction holes 1a are provided in the portion where 101b is placed. These suction holes 1a are communicated with an air suction hole of a vacuum pump (not shown). That is, each of the optical disks 101a and 101b is sucked onto the movable table 1 when the vacuum pump operates to suck air through the suction hole 1a.

The moving table 1, as shown in FIG.
The lower side of the so-called roll coat type adhesive application device 2 is operated to move in the horizontal direction indicated by arrow A in FIG.

The adhesive applicator 2 has an adhesive tank 3, and a roller installed on the bottom side of the adhesive tank 3 is installed in a hole 3a so as to face the inside of the adhesive tank 3 and the outside of the lower side. It has an attached application roller 4. The adhesive tank 3 stores an adhesive 103 made of a rubber-based material, such as a so-called hot melt, heated to a usable temperature. The application roller 4 can be rotated as shown by arrow B in FIG. 2 by a rotation drive device (not shown), and is mounted so that the rotation axis is parallel to the upper surface of the movable table l. There is. When the application roller 4 is rotated, the adhesive 103 stored in the adhesive tank 3 is applied to the outer circumferential side.

Each of the optical discs 1 placed on the moving table 1
01a and 101b are conveyed by the movable table l while contacting the application roller 4 on which the adhesive 103 is applied. At this time, the coating roller 4 is rotated, and the coating roller 4 rolls into contact with the -1-recording optical disc 101. The application roller 4 applies the adhesive 103 adhered to the outer peripheral surface to the back side of each of the optical disks 101a and 101b so as to transfer the adhesive 103 thereon. Each optical disk 101 is carried out from below the adhesive coating device 2. a, 101b has the third
As shown in the figure, the adhesive 103 is applied over the entire surface.

As shown in FIG. 4, the surface of the adhesive 103 applied to each of the optical discs 101a and 101b in this manner is rolled into contact with the optical disc 101 by the application roller 4 indicated by arrow C in FIG. The unevenness has protrusions and grooves arranged in a direction substantially perpendicular to the direction of relative movement between the coating roller 4 and each of the optical disks 101a and 101b. It is in a state.

This is because the adhesive 103 is applied to each optical disc 101a, 101b while being stretched between the application roller 4 and each optical disc 101a, 101b due to the viscosity of the adhesive 103. It is.

As shown in FIG.
It is placed on the adhesive table 5 with the back side facing one side. A positioning pin (j) is installed on the adhesive base 5. The optical disc 101a is positioned and placed on the adhesive base 5 by inserting the positioning pin 6 into the center hole 104a. Ru.

Further, the other optical disk 101b of the ten optical disks ]01a, ]O1b is held by the deformation holding device 7, as shown in FIG. - Optical disc 1 placed on the adhesive table 5
The back side is made to face 01a. The deformation holding device 7
has a suction hole 7a on the peripheral side that is connected to a vacuum pump (not shown) to suction and hold the peripheral side of the optical disc 101b, and has a pressing hole 7a on the central part for pressing and supporting the central part of the 4-light distribution disc 101b. It has a member 7b. That is, the optical disk 101b is held by the deformation holding device 7 at its peripheral edge side by suction and at the same time its central portion is pressed and supported downward, so that the central portion on the back side bulges downward. It has been transformed and preserved.

and - the deformation holding member 7 is adapted to each of the optical discs 1;
The application rollers 4 of 01a and 101b are rotated around the axis of the optical disc I0111 by approximately 90 degrees, for example, so that the directions in which they are rolled in contact with each other form an angle that intersects with each other.

Next, each of the optical discs +01a, ], 01b is moved from one back side to another as the deformation holding device 7 is moved in a direction approaching the adhesive base 5 as indicated by the arrow in FIG. They are overlapped so that they are facing each other with the adhesive 103 in between.

At this time, since the optical disc 101b held by the deformation holding device 7 is deformed so that the central part bulges downward, these optical discs 1018, 101b are
As shown in FIG. 6, first, the adhesives 103 applied to the central portions of the two contact each other, and then the contact portions are gradually expanded toward the outer periphery. By stacking the optical discs 101a, 101b in this manner, air bubbles in the adhesive 103 applied to the optical discs 101a, 101b are removed toward the outer periphery of the optical discs 101a, 101b. Further, the height of the adhesive layer made of the adhesive 103 is uniform.

Then, each of the optical disks 101a and 101b is pressed with a force of about IL, for example, by a pressurizer (not shown), and then bonded together. At this time, the air bubbles in the adhesive layer are removed toward the outer periphery of each of the optical discs 101a and 101b, and the thickness of the adhesive layer is made uniform, so that the optical disc 101a is marked with -.
, 101b are well maintained. Further, each of the optical disks 101a and 10fb is arranged such that the directions in which the L coating roller 4 is rolled in contact with each other intersect with each other.
As shown by the dotted line and the dashed line in the figure, the adhesive 103
The directions of the protrusions on the surface of the ridges are arranged to intersect with each other. Therefore, in this double-sided optical disc 102, the unevenness on the surface of the adhesive 103 applied to each of the optical discs 101a, 101b cancels out each other, and the unevenness on the surface of the adhesive 103 cancels out each other. The structure is such that the flatness of the surface is prevented from being affected.

The double-sided optical disc 102 constructed by bonding the optical discs 101a and 101b together in this way is
The outer periphery is finished by cutting. That is, as shown in FIG. 8, the double-sided optical disk 102 is held and rotated by the rotation holding device 8, and the
The cutting tool 9.10 is brought into contact with the outer circumferential side, thereby cutting the outer circumferential side.

The rotation holding device 8 is configured so that the double-sided optical disc 102 is placed thereon, and includes a rotary table section 11 rotatably supported by a pair of bearings 11c. This rotary table section 11 includes a mounting section 11 formed in an annular shape so as to support the outer peripheral side of the double-sided optical disc 102.
It has a. This mounting portion 11a is made of a material such as silicon rubber. This mounting section 1
A suction slit Ilb that communicates with the suction port of the vacuum pump 12 is provided in 1a. That is, when the vacuum pump 12 operates and sucks air through the suction slit 7)llb, the double-sided optical disc 102 is suctioned onto the mounting portion 11a.

Further, the rotary table section 11 is configured to be rotated by a drive motor 13 via an endless drive belt 14 . The rotary table section 11 is rotated by the drive motor 13 at a speed of, for example, 900 to 120 Or/m.
It is rotated at a constant speed of about 1.5 in.

Further, the rotation holding device 8 includes the rotation table section 11.
The holding member 15 is opposed to the rotary table section 11 and is pressed against and supported by the mounting section 11a of the rotary table section 11. This pressing member 15 corresponds to the above-mentioned placement part 11a.
It has an annular holding portion 15a. That is, the double-sided optical disc 102 is held in the rotary holding device 8 with its outer circumferential side being sandwiched between the mounting portion 11a and the pressing portion 15a, and is rotated.

The first cutting tool 9 is a so-called flat cutting tool, and is brought into contact with the double-sided optical disc 102 with the flat blade portion 9a facing the outer peripheral edge of the double-sided optical disc 102 held by the rotation holding device 8. Supported so as to be movable in the away direction. The first cutting tool 9 is urged by a first urging spring 16 to move away from the double-sided optical disk 102 as indicated by arrow E in FIGS. 8 and 9A.

The second cutting tool 10 is a so-called ■-shaped cutting tool, and is brought into contact with the double-sided optical disk 102 with the ■-shaped blade portion 10a facing the outer peripheral edge of the double-sided optical disk 102 held by the rotation holding device 8. Supported so as to be movable in the away direction. Then, this second cutting tool 10
The double-sided optical disc 102 is biased by a biasing spring 17 to move away from the double-sided optical disc 102 as indicated by arrow F in FIGS. 8 and 9A.

These first and second cutting tools 1-9 and 10 are operated by first and second rotary cams 18 which are rotated in one direction at a constant speed as shown by arrows G and H in FIG. 9A. .1
9, a force of several meters is applied to the double-sided optical disk 102 with a time difference against the urging force of each of the urging springs 16 and 17.
The movement operation is performed at a speed of m/sec.

That is, the rotation holding device 8 holds the double-sided optical disc 1
02 to rotate the first and second rotating cams 18.
．． 19 is rotated approximately 90 degrees, the first cutting tool 9 is moved toward the double-sided optical disk 102 by the first rotating cam 18, as shown in FIG. 9B.

Then, the blade portion 9a of the first cutting tool 9 comes into contact with the outer peripheral end of the double-sided optical disc 102, and cuts the outer peripheral part of the double-sided optical disc 102 into a cylindrical shape.

When the first and second rotating cams 18 and 19 are further rotated by 90 degrees, as shown in FIG. 9C,
After the cutting by the first cutting tool 9 is substantially completed, the second cutting tool 10 is moved toward the double-sided optical disc 102 by the second rotary cam 19. Then,
The blade portion 10a of the second cutting hide 10 comes into contact with the outer circumferential edge of the double-sided optical disk 102, and cuts both outer circumferential edges of the double-sided optical disk 102 in a so-called chamfering manner.

The above first and second rotational forces J, 18.19 are further increased by 90
When rotated by .degree., as shown in Figure 9, the first cutting tool 9 has returned to its initial state, and the cutting by the second cutting tool 10 is almost completed. Then, by further rotating the rotating cams 18 and 19 by 90 degrees, the second cutting tool 10 returns to the initial state shown in FIG. ends.

The double-sided optical disc 102 is held at its outer circumferential side by the rotation holding device 8 and cut at its outer circumferential side by the first and second cutting hides 9 and 10, thereby causing so-called cracks in the signal recording layer. L7 is made to have a predetermined outer diameter size within an error range of, for example, about ±0.2 mm without bending.

H. Effects of the Invention As described above, in the method for processing the outer circumferential surface of a disk according to the present invention, the outer circumferential end surface of the disk is cut by a first hide having a linear blade, and then four parts are formed. Both side edges are cut by a second hide having a sharp blade.

Each hide used in this method has a blade portion of a simple shape, so it is easy to produce and has good durability. As a result, the shape of the blade portion of each cutting tool is maintained well, so that cutting can be performed without causing cracks in the disk base material, signal recording layer, etc. that form the disk.

That is, the present invention can improve the durability of the hide and provide a method for processing the outer circumferential surface of a disk that does not cause cranking in the disk base material or signal recording layer. .

9

[Brief explanation of drawings]

FIG. 1 is a perspective view showing the configuration of a movable table on which a pair of optical disks is placed and transported, which is used in the manufacturing process of a double-sided optical disk manufactured using the disk outer peripheral surface processing method according to the present invention. FIG. 2 is a side view showing the configuration of an adhesive coating device used in the manufacturing process of the double-sided optical disk, and FIG. 3 is a perspective view showing a pair of optical disks coated with adhesive by the adhesive coating device. ,
FIG. 4 is an enlarged perspective view, partially cut away, showing the state of the adhesive applied to the optical disc, and FIG. FIG. 6 is a partially cutaway side view showing a state in which the adhesive base and the deformation holding device are brought close to each other; FIG. FIG. 2 is a plan view showing a double-sided optical disc configured by pasting them together. FIG. 8 is a partially cutaway side view showing the structure of a rotation holding device and a cutting hide used in manufacturing the double-sided optical disc. FIG. 9A is a plan view showing the configuration of the rotation holding device and the cutting hide, and FIG. 9B is a plan view showing the rotation holding device when the rotating cam for moving the cutting tool is rotated by 90 degrees. and FIG. 9 is a plan view showing the state of the cutting tool;
Figure C shows the rotating cam that moves the cutting tool shown in Figure 9B.
FIG. 3 is a plan view showing the state of the rotation holding device and cutting high when rotated further 90 degrees from the state shown in FIG.
9th This is a plan view showing the state of the rotation holding device and the cutting tool when the rotary cam for moving the cutting hide is further rotated by 90 degrees from the state shown in FIG. 9C. FIG. 10 is a perspective view showing the structure of a double-sided optical disc manufactured using the method for processing the outer peripheral surface of a disc according to the present invention. Figure 11 i! FIG. 2 is an enlarged side view of a main part showing the shape of a hide conventionally used for processing the outer periphery of a double-sided optical disc. 1 2 9 a 0 0a 101 a 02 03 Rotation holding device First cutting tool blade part Second cutting tool blade part 101b... Pair of optical disks Double-sided optical disk adhesive

Claims (1)

[Claims] The disc is rotated, the outer peripheral end face of the disc is cut by a first cutting tool having a linear blade, and then the blade parts having recesses are cut on both side edges of the outer peripheral end face. A method of machining an outer circumferential surface of a disk by cutting it with a second cutting tool having a second cutting tool.