JP2000243059A - Buff unit for disk as well as disk repair device and disk repair method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to continuously and efficiently grind a disk by excellent heat radiatability, to additionally improve grinding efficiency by preventing vibration by a reduced weight and suppressing grinding traces and uneven grinding and to embody a lower cost by saving of a nonwoven fabric constituting a buff roll. SOLUTION: This disk repair device 37 consists of the constitution obtained by inserting supporting projections 26b projected from each attachments 26 to the inner side of a cylindrical core body 21 in the central part of a buff roll 42a held between the pair of attachments 26, by which the buff roll 42a described above is supported on the outer side of the supporting projections 26b. The surface area of the buff roll is greater than the volume of a nonwoven fabric layer 42b and has the excellent heat radiatability.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for grinding a surface of a transmission disk, such as a compact disk, a laser disk or a DVD (digital video disk), whose optical reading surface is covered with a resin transmission layer. The present invention relates to a disk buff unit to be polished, a disk repair device, and a disk repair method.

[0002]

2. Description of the Related Art As shown in FIG. 7, a compact disk, which is widely used as a recording medium for digital information such as music and computer software, has one side of an aluminum vapor-deposited film 2 on which signal bits 1 are formed, made of a hard resin or the like. And the other surface is covered with a 1.2 mm thick transmission layer 5 made of transparent polycarbonate through which the reading laser beam 4 can pass, so that the entire surface is formed in a disk shape. Is common. Then, the laser beam 4 oscillated from the laser beam oscillating unit of the reading device passes through the transmission layer 5 and strikes the signal bit 1 toward the reading surface 6 (the surface of the transmission layer 5) of the rotated disk. Signal bit 1
The signal recorded on the disk is optically read by receiving the reflected light from the light receiving unit of the reading device. However, polycarbonate is relatively easily scratched. When a scratch 8 is formed on the reading surface 6 as shown in FIG. 7, the incident angle of the laser beam 4 incident on the transmission layer 5 through the scratch 8 Then, the reflection angle of the laser beam 4 from the signal bit 1 to the light receiving unit of the reading device is bent, and a case occurs in which the reading by the reading device causes an abnormality. With a compact disc for music, the performance stops, jumps, repeats, and the like. A reading error occurs on a compact disc for computer software.

[0003] In recent years, the scratches 8
Has been proposed to repair the disk by erasing it by buffing. As shown in FIG. 8, this disk repair method rotates a baffle provided with a fibrous layer made of a flexible fiber such as flannel or cotton on an outer peripheral portion,
A first step 9 for polishing the permeable layer 5 by abutting the reading surface 6 using an abrasive obtained by mixing abrasive particles having a particle size of about 1800 with grease or the like, and a second step for removing the abrasive It is common to consist of ten. When the transparent layer 5 is scraped off from the disk reading surface 6 by the polishing in the first step 9 and the scratches 8 are erased, the bending of the reading laser beam 4 due to the scratches 8 is eliminated, so that normal reading without a reading error or the like is reproduced. Is done.

[0004]

By the way, the cutting depth of the reading surface 6 in the first step 9 is 0.05 mm.
In general, the scratch 8 having a depth of about 0.1 mm was practically impossible to repair the disk only by polishing in the first step 9.
When the polishing in the first step 9 is performed for a long time (around 10 minutes) to increase the scraping depth of the reading surface 6, the heat generated by the contact between the baffle and the disk damages the polycarbonate of the transmission layer 5 (distortion and deformation). Etc.), there is a limit in increasing the shaving depth of the reading surface 6, and at present, the shaving depth of about 0.1 mm has not been realized. For this reason, a depth of 0.1 mm
Or, in order to erase deeper scratches 8 larger than
First, the reading surface 6 near the scratch 8 is locally polished with a sandpaper to which abrasive grains having a coarser grain size than the abrasive used in the first step 9 are fixed, and the scratch 8 is erased. It is a fact that one step 9 is executed to finish the whole substantially flat, and there is a problem that the work is troublesome. Since the transmission layer 5 made of polycarbonate is excellent in abrasion resistance,
The time required for polishing with sandpaper also causes a reduction in workability.

[0005] In view of the above-mentioned problem, using a baffle having a large grinding ability (grain having a coarse grain size), a thickness of 0.1 mm
It is conceivable to realize the above-mentioned scraping depth of the disk reading surface 6. Also in this grinding, as a problem peculiar to the transmission layer 5 made of polycarbonate, it is necessary to suppress heat generation at the time of grinding. However, there is no suitable baffle or grinding method that can solve this problem.

For example, a baffle 11 shown in FIG. 9 is an example of a grinding baffle, and as shown in FIG. 10, a plurality of circular nonwoven fabrics 12 each having abrasive grains fixed to a nylon synthetic resin fiber base material are laminated. The central hole 12a is inserted into a rotary drive shaft 13 (see FIG. 9) and is sandwiched between presser nuts 14 screwed to the rotary drive shaft 13 from both sides. , And is fixed to the rotary drive shaft 13. When the permeable layer 5 is ground by bringing the outer peripheral surface of the baffle 11 integrally rotated together with the rotary drive shaft 13 into contact with the disk reading surface 6, heat is generated in a few minutes, and the polycarbonate (melting point 220 to 2)
(30 ° C.). Further, since the entire baffle 11 becomes a heat storage layer, it takes a long time to cool down after the grinding, and if the next disk grinding is started without being sufficiently cooled, the transmission layer 5 is affected in a shorter time. It reaches a high temperature that gives it. For this reason, there is a problem that it is necessary to secure a sufficient cooling time, and as a result, it is not possible to improve the grinding ability of the disk. Also,
Although it is conceivable to reduce the heat generation by reducing the grinding time by using extremely coarse abrasive grains, the first step 9 is to grind the reading surface 6 to a mirror surface that does not affect the optical reading. The limit of the grain size of the abrasive grains used for polishing and grinding is about 1500. If the grain size of the abrasive grains is larger than this, grinding efficiency is improved, but it is difficult to completely remove grinding marks. I can't solve it. Even when using while gradually changing the baffle so that the abrasive grains become finer,
The problem of the cooling time cannot be fundamentally solved, and the grinding capacity cannot be improved.

Further, the portion of the baffle 11 used for grinding the disk is only the outer peripheral portion, and the material near the center of rotation is wasted, which is disadvantageous in cost. In addition, because of its heavy weight, when it is driven to rotate, it is liable to cause vibrations, which causes grinding unevenness and grinding marks.
Further, in the baffle 11, crush deformation occurs in the outer peripheral portion in contact with the disk (the phantom line in FIG. 9), which causes grinding unevenness and grinding marks to such an extent that erasure is difficult due to subsequent polishing or the like. There is also a problem.

The above problem is not limited to compact discs, but also occurs in repairing various optical discs having an optical reading surface formed of a resin transmission layer, for example, laser discs. However, compared to the acrylic resin that forms the transmission layer of the laser disk, polycarbonate is easily damaged, and has excellent abrasion resistance and is difficult to grind or polish.
Prominently caused by compact discs.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and it is possible to continuously and efficiently grind a disk with excellent heat radiation, and to reduce vibrations by reducing the weight to reduce grinding marks and uneven grinding. An object of the present invention is to provide a disk buff unit, a disk repair apparatus, and a disk repair method that can further improve the grinding efficiency by suppressing the amount of the nonwoven fabric forming the baffle and reduce the cost by saving the nonwoven fabric.

[0010]

According to the first aspect of the present invention,
A disk buff unit for grinding or polishing the surface of the transmission layer of a disk whose optical reading surface is covered with a transmission layer made of resin by being driven to rotate, wherein the cylindrical core is A cylindrical baffle in which a nonwoven fabric layer formed by fixing and compressing a plurality of nonwoven fabrics in which abrasive grains are fixed to nylon fibers is formed on the outer periphery of the body,
A pair of disk-shaped attachments sandwiching the baffle from both sides in the axial direction, wherein the attachment includes a core abutting portion that abuts against an axial end surface of the core of the baffle; and the core abutting portion. A support protrusion that protrudes from the attachment radially inner side to support the baffle by being removably inserted into the core body, and the attachment radially outward from the core body contact portion, from the nonwoven fabric layer. The outer diameter also includes a holding plate portion that is projected to a flange shape having a small diameter of about several mm and is abutted on the nonwoven fabric layer from the outside in the baffle axial direction.The baffle is located between the core contact portions of the attachments on both sides. The core is sandwiched and transmitted to the attachment by the core being supported outside the support projections of both attachments. The attachment is fixed so as to be able to rotate integrally with the attachment by the rotational driving force, and the nonwoven fabric layer is sandwiched between the holding plate portions of the attachments on both sides, so that the outer periphery of the nonwoven fabric layer is outside the holding plate portion. A buff unit for a disk, characterized in that a protruding portion protruding by about several mm is formed as a means for solving the above problem. According to this disk buff unit, the support projections of the attachment are inserted into the inside of the core body from both sides in the axial direction of the baffle, and the core body contact portion abuts on the axial end surface of the core body. It is assembled by sandwiching a nonwoven fabric layer between them. Then, by transmitting the rotational driving force to the attachment, the baffle is rotationally driven integrally with the attachment, and the outer peripheral surface of the nonwoven fabric layer is brought into contact with the disk transmission layer to perform grinding or polishing. During the grinding and polishing operations, the deformation of the nonwoven fabric layer sandwiched between the holding plate portions of both attachments is prevented, so that the disc permeable layer can be ground and polished without unevenness. If the support projection of the attachment is pulled out from the inside of the core, the attachment is detached from the baffle, and the disk buff unit can be easily disassembled. The nonwoven fabric layer is formed only on the outer peripheral portion of the core body, and has a smaller heat capacity than a buff unit formed entirely or substantially entirely by the nonwoven fabric layer, so that it can be sufficiently cooled in a short time. The air permeability inside the core also functions as a heat dissipation space from the nonwoven fabric layer, and improves the cooling efficiency of the nonwoven fabric layer.

According to a second aspect of the present invention, in the disk buff unit according to the first aspect, the nonwoven fabric layer includes a plurality of nonwoven fabrics extending along the axial direction of the core along the circumferential direction of the core. It is characterized in that a plurality of sheets are continuously connected and collectively compressed. According to the present invention, at the time of grinding and polishing the disk permeable layer, the non-woven fabric pressed against the disk is curved and deformed, and the curved non-woven fabric and another non-abutting disk that is not in contact with the adjacent disk in the buff unit rotation direction front. A gap is formed between the non-woven fabric and the non-woven fabric, and heat radiation of heat generated by grinding and polishing is promoted.

According to a third aspect of the present invention, there is provided a disk repair apparatus in which the disk buff unit according to the first or second aspect is mounted on a rotary drive shaft which is driven to rotate by a drive mechanism, and is provided at a central portion. A pair of attachments each having a through hole penetrated through the rotary drive shaft, and a baffle disposed between the pair of attachments through a space inside the core body through the rotary drive shaft. Is fixed by being pressed toward a supporting member attached to the other end of the rotary drive shaft by a pressing member detachably attached to one end of the rotary drive shaft. Further, the pressing member is removed from the rotary drive shaft. Thereby, one or both of the attachment and the baffle can be extracted from the rotary drive shaft. According to the present invention, the buff unit can be easily fixed or removed simply by attaching or detaching the pressing member to or from one end of the rotary drive shaft. By removing the attachment and the baffle from the rotary drive shaft and inserting another baffle into the rotary drive shaft, the baffle can be easily replaced.
If the core size of each baffle applied to the disk repair device is fixed, a common attachment can be used, which is advantageous in cost.

The invention according to claim 4 is the first or second invention.
Using the disk buff unit according to the description, while replacing the baffle with a grain size of the abrasive grains from 600 to 1500 in several stages from coarser ones of the abrasive grains to finer ones,
Resin transmission layer up to 0.5m from reading surface of disc
The grinding step for grinding and the surface of the permeable layer of the disc after the grinding step are made of a soft fiber such as flannel or cotton by using an abrasive obtained by mixing abrasive grains having a particle size of 1200 to 1800. Polishing performed by a baffle provided with a fibrous body layer on the outer peripheral portion, the abrasive is changed over several steps from coarser particles to coarser particles, and accordingly, the baffle is also changed. After polishing the surface of the permeable layer of the disc, which has been completed by the polishing step, with a buff roll using an abrasive obtained by mixing fine abrasive grains having a particle size of 2,000 or more in a binder, the polishing is performed. A mirror finishing step of wiping the agent and applying a coating agent. According to the present invention, even a deep flaw having a depth of 0.1 mm or more can be efficiently erased by the grinding process. The polishing process performed by a baffle provided with a fibrous body layer made of a flexible fiber such as flannel or cotton on the outer periphery is excellent in mirror polishing of the resin-made transmission layer, and is formed on the surface of the transmission layer in the grinding process. Erase grinding marks and the like. In this polishing step, finally, the particle size is 1800.
The polishing marks are almost completely eliminated by the buff polishing using the abrasive mixed with the abrasive grains. Furthermore, in the polishing in the mirror finishing step, polishing marks are surely erased, and furthermore, by polishing the surface of the disk transmission layer to a mirror surface, irregular reflection or refraction of the reading laser light does not occur. Form a suitable reading surface.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. First, an embodiment of a disk buff unit according to the present invention will be described. In addition,
In the figure, the same components as those in FIG. 7 (the configuration relating to the disk D) are denoted by the same reference numerals, and the description thereof will be simplified.

FIG. 1 is a view showing a disk buff unit 20 according to a first embodiment of the present invention. FIG. 1A is a side view of a baffle 25 viewed from an axial end face, and FIG. FIG. 3C is a front view showing a state in which the attachment 26 is attached.
FIG. 1 (a) and 1 (b), a disk buff unit 20 is a nonwoven fabric 2 in which abrasive grains 22 are fixed to nylon-based fibers on the outer periphery of a cylindrical core 21.
And a cylindrical baffle 25 having a non-woven fabric layer 24 formed by fixing and fixing a plurality of non-woven fabric layers.
5 is provided with a pair of disk-shaped attachments 26 that sandwich the sensor 5 from both sides in the axial direction. The nonwoven fabric layer 24
Is a nonwoven fabric 2 extending and arranged along the axial direction of the core 21.
3 are provided in series along the circumferential direction of the core body 21 and are collectively compressed.

As the core 21 of the baffle 25, a material having light weight and sufficient strength such as plastic is preferably adopted. However, it is preferable that the core body 21 has as high a thermal conductivity as possible in view of enhancing the heat radiation from the nonwoven fabric layer 24 when used for grinding and polishing the disk. In FIGS. 1A and 1B, the nonwoven fabric 23 is fixed to the outer peripheral portion of the core body 21 by bonding with an adhesive 27. However, core 2
1 The fixing of the nonwoven fabric 23 to the outer peripheral portion is not limited to this,
Various methods such as fusion to the core body 21 and mechanical fixing using a fixing component can be adopted. The nonwoven fabric 23 made of a nylon-based fiber is suitably used as a material that does not excessively damage the disc permeable layer made of polycarbonate.

The baffle 25 has, for example, an inner diameter a =
40 mm, axial dimension b = 50 mm, wall thickness c = 4.5 m
m on the outer peripheral surface 21 a (core outer peripheral portion) of the cylindrical core 21.
A rectangular nonwoven fabric 23 is extended along the axial direction of the core 21 and fixed with an adhesive 27, and a plurality of nonwoven fabrics 23 continuously arranged along the circumferential direction of the core 21 are collectively compressed to form a nonwoven fabric layer. 24 is formed. The dimension d in the long side direction of the nonwoven fabric 23 matches the dimension b in the axial direction of the core body 21 (5
0 mm), and the dimension e in the short side direction opposed to the longitudinal direction is 1
8 mm. Each nonwoven fabric 23 constituting the nonwoven fabric layer 24
Is that one side in the short side direction (one of the long sides) is adhesively fixed to the outer peripheral surface 21a of the core body, and is erected from the outer peripheral surface 21a of the core body toward the outside in the radial direction of the core body 21. Outer diameter f
= 85 mm nonwoven fabric layer 24 is formed. Non-woven fabric 23
Is fixed to the core outer peripheral surface 21a so that the long side direction does not protrude from the core 21 and is fixed to the core outer surface 21a.
The axial end face 24a is flush with the axial end face 21b of the core 21. It goes without saying that the dimensions of the core 21 and the nonwoven fabric 23 can be changed as appropriate.

Further, since each of the nonwoven fabrics 23 constituting the nonwoven fabric layer 24 is radial from the core 21, the protrusion of the nonwoven fabric 23 from the outer peripheral surface 21a of the core (nonwoven fabric 23)
(Corresponding to the dimension e in the short side direction) has no effect on the grinding and polishing of the disk permeable layer due to the contact of the nonwoven fabric 23 and the nonwoven fabric 2
(3) It is preferable to suppress as much as possible as long as a sufficient heat radiation space (described later) can be formed by the elastic deformation. That is, for example, in the nonwoven fabric layer 24 formed of a plurality of nonwoven fabrics 23 having a constant thickness, the difference in inner and outer diameters of the nonwoven fabric layer
3 makes a difference in the compression ratio. That is, the nonwoven fabric layer 24
In the inner peripheral part, the compression ratio increases, and in the outer peripheral part, the compression ratio decreases. For this reason, if the non-woven fabric 23 has a large projecting dimension from the core outer peripheral surface 21a, the non-woven fabric layer 24 has a uniform outer periphery without gaps unless the compression ratio on the inner peripheral side of the non-woven fabric layer 24 is extremely increased. The surface 24b cannot be obtained. However, in the nonwoven fabric layer 24 of the baffle 25 of the disk buff unit 20 according to the present invention, if the outer diameter of the core 21 is increased, the protrusion size of the nonwoven fabric 23 from the core outer peripheral surface 21a does not need to be increased unnecessarily. Thus, the desired outer diameter can be easily obtained in the nonwoven fabric layer 24, and the outer peripheral surface 24b in which a plurality of nonwoven fabrics are continuous without any gap is obtained.

As shown in FIGS. 1B and 1C, the attachment 26 is formed of a material having sufficient strength such as a metal, and preferably, a lightweight metal such as aluminum is used, for example. . The attachment 26 includes a core contact portion 26a that abuts against an axial end face 21b of the core 21 of the baffle 25, and a core contact portion 26a.
A support protrusion 26b that projects from the radially inner side of the attachment 26 and that is removably inserted into the core 21 to support the baffle 25; and the radially outer side of the attachment 26 from the core contact portion 26a. And a pressing plate portion 26c which is protruded into a flange shape having an outer diameter smaller than the nonwoven fabric layer 24 by about several mm, and which comes into contact with the nonwoven fabric layer 24 from outside in the axial direction of the baffle 25.

In the present embodiment, the core contact portion 26a
Is the base end of the holding plate 26c, and the end face 2 in the axial direction of the core body.
The surface abutting on 1b is flush with the surface abutting on the non-woven fabric layer axial end surface 24a of the holding plate portion 26c. The core contact portion is not limited to the present embodiment, for example,
A configuration such as a groove shape into which the axial end of the core body 21 can be inserted can also be adopted. When the groove-shaped core contact portion 26a into which the axial end of the core 21 is inserted is adopted, the positioning of the core 21 can be improved. In addition, the holding plate portion 26c is a baffle 2
When the attachment 26 is brought into contact with the nonwoven fabric layer 5, it may be shaped so as to protrude toward the inside of the nonwoven fabric layer 24 from the axial end face 24 a of the core body. In this case, even when the dimension of the nonwoven fabric layer 24 in the axial direction is smaller than that of the core 21, the holding plate portion 26c can be brought into contact with the nonwoven fabric layer 24. Also, if the size of the pressing plate portion 26c protruding into the nonwoven fabric layer 24 is increased,
It is also possible to apply an axial compressive force to the nonwoven fabric layer 24. In the present embodiment, the support protrusion 26b is a ring-shaped protrusion, but is not limited thereto, and various configurations such as a plurality of rod-shaped protrusions can be adopted. The center plate 26d provided inside the support protrusion 26b and the through hole 26e at the center of the center plate 26d are rotated by a drive mechanism 28 (motor) as shown in FIG. It is inserted through the shaft 29. Since the inner diameter of the through hole 26e substantially matches the outer diameter of the rotary drive shaft 29,
The attachment 26 in which the through hole 26e is inserted into the rotary drive shaft 29 is stably supported without rattling.
However, the through-hole 26e may be omitted or its design may be changed depending on the configuration of a mechanism for rotating and driving the disk buff unit 20.

FIG. 2 shows this disk buff unit 20.
5 is a front view showing a state of attachment to the rotary drive shaft 29. FIG. In FIG. 2, the disk buff unit 20
A pair of attachments 26 inserted by penetrating the through hole 26 e through the rotation drive shaft 29, and inserted into the rotation drive shaft 29 so as to house the rotation drive shaft 29 inside the core 21. The baffle 25 disposed between the pair of attachments 26 and the other end of the rotary drive shaft 29 (the drive mechanism 28 side) by a pressing member 30 detachably attached to one end 29 a of the rotary drive shaft 29. Is fixed by being pressed toward the supporting body 31 attached to the support. In the present embodiment, the pressing member 30 is a nut component screwed to the one end 29a of the rotary drive shaft, and is screwed into the one end 29a of the rotary drive shaft so as to be inserted into the one end 29a of the rotary drive shaft. A pressing force is applied to the support body 31 to the unit 20.
Thereby, the core 21 of the baffle 25 is sandwiched between the core contact portions 26a of the attachments 26 on both sides, and the core 21 is supported outside the support protrusions 26b of the attachments 26. The rotation driving force transmitted to the attachment 26 fixes the attachment 26 so as to be able to rotate integrally therewith. In addition, since the nonwoven fabric layer 24 is sandwiched between the holding plate portions 26c of the attachments 26 on both sides, the outer peripheral portion of the nonwoven fabric layer 24 projects several mm (for example, 5 mm) outside the holding plate portion 26c. Part 24c
Is formed.

Then, the drive mechanism 28 is activated, and the
When the outer peripheral surface 24b of the nonwoven fabric layer of the baffle 25 of the disk buff unit 20 rotated at a rotational speed of about 0 to 1450 rpm contacts the reading surface 6 of the disk D,
The transmission layer 5 can be ground or polished from the reading surface 6.

When the pressing member 30 is removed from the rotary drive shaft 29, the disk buff unit 20 can be removed from the rotary drive shaft 29. In a state where the pressing force from the pressing member 30 is released, the attachments 26 can be freely detached from the baffle 25.For example, only the attachment 26 and the baffle 25 on the one end 29a of the rotary drive shaft are extracted, and instead, If another baffle 25 and attachment 26 are inserted, the baffle 25 can be easily replaced. If various baffles are formed in a size compatible with the attachment 26, the baffle can be easily exchanged using the common attachment 26. In addition, since the attachment 26 is common, it is advantageous in terms of cost.

FIGS. 3A and 3B are views showing another form of the disk buff unit 32, wherein FIG. 3A is a side view of the baffle 35 viewed from the axial end face side, and FIG. 3B is an exploded front view.
The disk buff unit 32 has a baffle 35 in which a plurality of ring-shaped non-woven fabrics 33 are laminated and fixed on the outer peripheral surface 21a of the core body 21 and fixed by compression. And a pair of attachments 26 that are supported by being sandwiched between them. The plurality of non-woven fabric layers 33 constituting the non-woven fabric layer 34 are formed by, for example, using an adhesive 36 on the inner peripheral surface of the central hole 33a.
The core body 21 is fixed to the core body 21 by adhering to the core body outer peripheral surface 21a by the method described above. The axial end face 34a of the nonwoven fabric layer 24 coincides with the core body axial end face 21b.

The disk buff unit 32 is shown in FIG.
The disk buff unit 20 shown in (a), (b), etc.
, And a support form by a pair of attachments 26 is the same as that of the disk buff unit 20 described above. That is, the support projections 26b of the attachments 26 on both sides are inserted inside the core body 21, the core body contact portions 26a abut against the core body axial end surfaces 24a, and the nonwoven fabric layer is provided between the holding plate portions 26c of both attachments 26. Insert 34. The attachment / detachment of the disk buff unit 32 to / from the rotary drive shaft 29 in FIG. 2 is performed in the same manner as the disk buff unit 20.

FIGS. 4A and 4B are views showing the disk repair device 37, wherein FIG. 4A is a plan view and FIG. 4B is a front view. FIG.
In (a) and (b), the disk repair device 37
Is mounted with a drive mechanism 28 attached to a base 38 and a support arm 40 for supporting a turntable 39 rotatably supported about a rotation shaft 39a. The support arm 40 is rotatable about the rotation support portion 41 (in the direction of arrow A in FIG. 4A), and by this rotation, the turntable 39 is attached to the rotation drive shaft 29 of the drive mechanism 28 for the disk. The buff unit 42 can move forward and backward. Turntable 39
The reading surface 6 of the disk D supported on the disk buffer 42 of the disk buff unit 42 that is being rotationally driven.
When the disk transmission layer 5 is brought into contact with the outer peripheral surface of the non-woven fabric layer 42b, the reading surface 6 is ground or polished.
As the disk buff unit 42, FIG.
(B), the disk buff unit 20 shown in (c), etc.
Alternatively, the disk buff unit 32 shown in FIGS. 3A and 3B is employed.

The turntable 39 is driven to rotate by contact with the outer peripheral surface of the nonwoven fabric layer 42b, but is decelerated by the sliding contact of a sliding member (not shown). Grinding or polishing of the disk transmission layer 5 is performed depending on the difference in the rotation speed (peripheral speed). In addition, the disk accommodation recess 39 of the turntable 39
Since a non-slip material is provided at the bottom of the disk b, the disk D housed in the disk housing recess 39b rotates integrally with the turntable 39 without causing slip.

When the knob 41a of the rotary support 41 is rotated, the entire support arm 40 is displaced, and the pressing force of the turntable 39 against the nonwoven fabric layer 42b is adjusted. The rotation support part 41 also serves as a pressing force adjustment mechanism. Specifically, the knob shaft portion 41b is in the form of a bolt screwed to a screw portion 38a (a nut is illustrated in FIG. 4B) in the base 38, and when the knob 41a is rotated, the screw shaft portion 41b is screwed. When the screwing position with respect to the portion 38a is changed, the entire knob 41a is displaced. Support end 40 of support arm 40
a is a pressing piece 41 protruding in a flange shape from the knob shaft 41b by a spring force of a spring 41d interposed between the supporting end 40a and the supporting base 41c.
Since it is constantly pressed toward e, it is displaced integrally with the displacement of the knob 41a.

Needless to say, the design of the disk repair device 37 can be changed as appropriate. For example, FIG.
(A) and (b) show the configuration in which the disc D is supported on the turntable 39 which is supported by the vertical rotation shaft 39a, but the present invention is not limited to this. A configuration supported by a rotating shaft can also be adopted. Further, a moving mechanism for moving the turntable 39 with respect to the disk buff unit 42 so as to be able to advance and retreat, and a pressing force adjusting mechanism can be appropriately changed.

Next, a disk repair method using the disk buff unit and the disk repair device 37 according to the present invention will be described with reference to FIG. In FIG. 5, the disk repair method includes a grinding step, a polishing step, and a finishing step.

In the grinding process, the disk buff unit 2
Using non-woven fabrics 0 and 32, nonwoven fabric baffles 25 and 35 (only described as “non-woven fabric” in FIG. 5) having abrasive grains of 600 to 1500 are sequentially changed from coarse to fine in several stages. The reading surface 6 of the disk D
Is ground to a maximum of 0.5 mm. Separately,
Abrasives are not used together. For example, nonwoven fabric baffles 25 and 35 having a grain size of 600 abrasive grains for 30 seconds (first step 51),
Non-woven baffle 25 with a particle size of 800 for 30 seconds (second step 52), non-woven baffle 25 with a particle size of 1500,
At 35, three-stage grinding is performed for 30 to 60 seconds (third step 53). The first and second steps 51 and 52 are based on the use of the baffle 25 having higher heat dissipation, and the third step 5
3 selects and uses one of the baffles 25 and 35 in accordance with the depth of the scratch 8 of the disk D or the like.

Here, in the case of the baffles 25 and 35, the deformation which spreads in the axial direction is restricted by the nonwoven fabric layers 24 and 34 being sandwiched between the holding plate portions 26c of the attachments 26 on both sides. Without causing
The transmission layer 5 can be ground uniformly. Further, since the shape of the nonwoven fabric layers 24 and 34 can be stably maintained, the replacement cycle can be extended, so that the cost can be reduced. Further, due to the wear of the nonwoven fabric layers 24, 34 of the baffles 25, 35, the protrusion dimension of the attachment 26 outward from the holding plate 26c (see the dimension of the protrusion 24c of the baffle 25 in FIG. 1B) becomes insufficient. Cod plate 26
By replacing the attachment with an attachment having a small protrusion size of c, an appropriate protrusion can always be obtained stably, and the life can be further extended.

In this grinding step, in particular, the nonwoven fabric layer 24,
There is a problem of heat generation due to contact between the transmission layer 34 and the transmission layer 5. However, the nonwoven fabric layers 24 and 34 of the baffles 25 and 35 are only outside the core body 21 and have a small core A space 21c formed inside the body 21 (FIG. 1)
(A), (b), (c), and FIGS. 3 (a), (b)), the surface area is large and the heat dissipation is excellent.
Overheating is suppressed. Moreover, each step 51, 52, 53
Are grinding in a short time of less than one minute, and a transition time is sequentially generated when the process is shifted to the next step.
It is possible to reliably prevent the occurrence of a high temperature that damages the surface. In the transition time to the next step, the baffles 25 and 35 may be cooled by irradiation of cooling air or the like. At this time, the cooling efficiency can be further enhanced by removing the attachment 26 and passing the cooling air through the space 21c. Further, as shown in FIG. 1 (d), a vent hole 26f is opened in the attachment 26, and cooling air is sent from the vent hole 26f into the space 21c of the core 21 so that the baffle 25 during the grinding operation can be used. 35 may be constantly cooled, in which case the baffles 25, 3
It is not necessary to secure the cooling time of 5 separately. As a result, for example, in the case where a dedicated disk repair device is prepared for each abrasive grain size of the baffle and the replacement of the baffle is omitted, the disk D is continuously ground one after another by eliminating the cooling time of the baffle. And the grinding efficiency is improved.

FIG. 6 is a view showing a grinding process using the baffle 25, and is an enlarged side view showing a contact portion between the outer peripheral surface 24b of the nonwoven fabric layer and the disk permeable layer 5. In the nonwoven fabric layer 24 in contact with the disk transmission layer 5, the nonwoven fabric 23 pressed in the disk transmission layer 5 is curved and deformed, and another nonwoven fabric adjacent to the buff unit 25 in the rotation direction and not in contact with the disk D is used. A gap 24d is formed between the gap 23 and the gap 23 to promote heat radiation of heat generated by grinding. When the nonwoven fabric 23 that is pressed and deformed by the disk transmission layer 5 is released from contact with the disk transmission layer 5, its original shape is restored by its own elasticity.

Next, in the polishing step, the surface of the disc permeable layer 5 which has been subjected to the grinding step is coated with a soft fiber such as flannel or cotton using an abrasive obtained by mixing abrasive grains having a particle size of 1200 to 1800. Polishing performed by a baffle provided with a fibrous body layer comprising an outer peripheral portion, the abrasive is changed in several steps from a coarser one to a finer one of the abrasive grains, and the baffle is also changed accordingly. Modify and run. In FIG. 5, this polishing step is performed with a particle size of 1
A fourth step 54 of polishing the permeable layer 5 for 4 minutes by Nerbuff using an abrasive mixed with 200 abrasive grains, and an abrasive mixed with abrasives having a grain size of about 1800 are used together with Nerbuff. Fifth step 5 for polishing transmission layer 5 for 2-3 minutes
5, the surface of the transmission layer 5 is mirror-polished by two-stage polishing. Also in this polishing step, the fourth and fifth steps 54,
55 is a short-time polishing less than 5 minutes, so that the heat generated by the polishing does not reach a high temperature at which the transmission layer 5 is damaged.

Although the grinding marks formed in the grinding step are almost completely eliminated in the third step 53, in the polishing step, first, in the fourth step 54, the abrasive grains are coarser than in the third step 53. Grinding traces are surely erased by polishing using an abrasive, and when the fifth step 55 is completed, a mirror-reading surface is formed on the surface of the transmission layer 5 that has been ground and polished. In the fifth step 55, polishing and mirror finishing are performed in parallel. For example, the CDR-20 manufactured by Plenty uses the polishing buff and the finishing buff simultaneously to polish the disk transmission layer 5, so that the polishing and the finishing can be performed simultaneously, and the working time is reduced. Therefore, it is suitable. However, even with this polishing and finishing apparatus, heat is generated by continuous use for several minutes, and it is not possible to cope continuously. Therefore, it is more preferable to avoid continuous use for more than 5 minutes, for example.

The baffle used in the fourth and fifth steps 54 and 55 may be a known Nerbuff or the like. For example, the baffle 35 shown in FIGS.
Instead of the nonwoven fabric 33, it is also possible to adopt a structure in which a plurality of buffing cloth bodies formed in a similar ring shape are laminated outside the core body 21 and compressed and fixed. This allows
Heat generation can be suppressed more reliably, and the cooling time during heat generation can be reduced. If the baffles used in the fourth and fifth steps 54 and 55 can be attached to and detached from the rotary drive shaft 29, the steps from the grinding step to the polishing step can be performed using the same disk repair device 37. .

Next, in the mirror finishing step, the surface of the disk permeable layer 5 after the polishing step is finished for one minute with a buff roll using an abrasive in which fine abrasive grains having a particle size of 2000 or more are mixed in a binder. It comprises a sixth step 56 for polishing and a seventh step 57 for wiping the abrasive and applying a coating agent. In the polishing in the sixth step 56, even the very minute irregularities on the surface of the transmission layer 5 formed on the mirror surface in the fifth step 55 are completely eliminated. In the seventh step 57, the coating agent further forms a smooth film, enhances the optical characteristics of the surface of the transmission layer 5, and prevents the reading laser beam 4 from bending and irregular reflection.

It should be noted that the transition from the first step 51 to the next step is performed by either replacing the baffle or the like in the same disk repairing device 37 or transferring the disk to a disk repairing device dedicated to each process. good. Grinding and polishing using the disk repair device 37 are performed while the support arm 40 is always rocked finely (arrows in FIG. 4A) around the rotation support portion 41, and the entire surface of the disk permeable layer 5 is uniformly baffled. The outer peripheral surface (outer peripheral surface of the nonwoven fabric layer) 42a is brought into contact. It is preferable that the swing of the support arm 40 be automatically performed by a swing mechanism mounted on the disk repair device 37.

In the grinding and polishing using the disk restoring device 37, the operation of the knob 41a weakens the initial pressing force for bringing the outer peripheral surface of the baffle 42a into contact with the disk permeable layer 5, and immediately after the start of polishing / grinding. It is important to increase the force and thereafter gradually decrease the pressing force until the process end time. Accordingly, it is possible to prevent the contact resistance from becoming excessive at the beginning of the grinding and polishing, and the grinding and polishing from becoming locally excessively deep. In addition, by gradually reducing the pressing force, it is possible to prevent a sharp change in the grinding depth or the polishing depth due to a sudden change in the pressing force, so that the grinding and polishing can be performed evenly. It is easy to efficiently finish the entire surface to a mirror surface.

In the present embodiment, since the grinding step of grinding to a maximum depth of about 5 mm without damaging the disk transmission layer 5 has been realized, a deep flaw 8 exceeding 0.1 mm in depth is obtained. Can be reliably erased.
In addition, the above-described disk repair method has an advantage that the time of the polishing process after the grinding process can be reduced, and the problem of overheating in the polishing process can be prevented.

The disk repair apparatus to which the disk buff unit according to the present invention can be applied is not limited to the one described in the above embodiment, and various configurations can be adopted. For example, it is also possible to adopt a disk repairing device having a configuration in which an attachment is supported on each of a pair of rotational drive shafts that can be approached and separated from each other, and a baffle is sandwiched between the attachments by causing the rotational drive shafts to approach each other. The disk buff unit, the disk repair apparatus, and the disk repair method of the present invention are not limited to compact disks for music and the like, but may be applied to various optical disks having a transmission layer that can be ground and polished, such as laser disks and DVDs. It goes without saying that it is applicable.

[0043]

As described above, according to the disk buff unit of the first aspect, (1) the surface area is large compared to the volume of the nonwoven fabric layer and the heat dissipation is enhanced, so that the disk transmission layer Grinding without damaging the heat,
(2) According to the above (1), grinding and polishing of the disk permeable layer can be performed continuously, and a large number of disks can be ground and polished in a short time.
(3) Since the material for forming the nonwoven fabric layer is small, the cost can be reduced. (4) Since the volume of the nonwoven fabric layer is small, the weight can be reduced, vibrations during rotation driving can be suppressed, and the disc can be formed without unevenness. The transmission layer can be ground and polished. (5) Since the attachment and the baffle can be easily separated, the baffle can be easily exchanged. In the case of performing grinding and polishing, an excellent effect such that the baffle can be quickly replaced and workability is improved is achieved. According to the disk buff unit of the second aspect, the gap formed in the portion of the nonwoven fabric layer that is in contact with the disk transmission layer can further enhance heat dissipation, and further improve the work efficiency of grinding and polishing. it can. Claim 3
According to the disk repairing device described above, the disk buff unit can be easily attached and detached simply by attaching and detaching the pressing member from the rotary drive shaft, and an excellent effect such as easy replacement of the baffle and the like is achieved. According to the disk repair method of the fourth aspect, the disk buffing unit according to the present invention includes a grinding step, and further includes a polishing step of erasing grinding marks in the grinding step. Even if a deep flaw exceeding 0.1 mm in depth is formed, it can be erased, and refraction and irregular reflection of the reading laser beam are prevented, and an optically excellent reading surface is formed on the disk transmission layer. Can be formed and can reliably repair damaged discs.

[Brief description of the drawings]

1A and 1B are diagrams showing a first embodiment of a disk buff unit of the present invention, wherein FIG. 1A is a side view of a baffle viewed from an axial end face side, FIG. 1B is an exploded front view, and FIG. c)
FIG. 4 is a perspective view showing an attachment, and FIG. 4D is a perspective view showing a modification of the attachment, showing an example in which ventilation holes are formed.

FIG. 2 is a front view showing a state in which the disk buff unit of FIG. 1 is attached to a rotary drive shaft of the disk repair apparatus according to the embodiment of the present invention.

3A and 3B are diagrams showing a second embodiment of the disk buff unit of the present invention, wherein FIG. 3A is a side view of the baffle viewed from an axial end face side, and FIG. 3B is an exploded front view. .

4A and 4B are diagrams showing a disk repair apparatus according to an embodiment of the present invention, wherein FIG. 4A is a plan view and FIG. 4B is a front view.

FIG. 5 is a flowchart showing one embodiment of a disk repair method according to the present invention.

6 is an enlarged side view showing a grinding step using the disk buff unit of FIG. 1 and showing the vicinity of a contact position between the outer peripheral surface of the nonwoven fabric layer of the baffle and the disk transmission layer.

FIG. 7 is a sectional view showing the structure of a general compact disc.

FIG. 8 is a flowchart showing a conventional disk repair method.

FIG. 9 is a front view showing an example of a conventional grinding baffle.

FIG. 10 is a front view showing a nonwoven fabric constituting the nonwoven fabric layer of the baffle in FIG. 9;

[Explanation of symbols]

5: transmission layer, 6: reading surface, 20: disk buff unit, 21: core, 21a: outer peripheral surface (core outer peripheral portion),
21b: axial end face, 21c: space, 22: abrasive grains, 23
... nonwoven fabric, 24 ... nonwoven fabric layer, 24c ... protruding portion, 25 ... baffle, 26 ... attachment, 26a ... core body contact portion, 26b ... support projection, 26c ... holding plate portion, 26e ... through hole, 28 ... drive mechanism, 29: rotary drive mechanism, 30: pressing member (nut part), 31: supporting member, 32: buff unit for disk, 33: non-woven fabric, 34: non-woven fabric layer, 35
... Baffle, 37 ... Disk restoration device, 42 ... Buff unit for disk, D ... Disk.

Claims (4)

[Claims] 1. A disk buff unit for grinding or polishing a surface of a transmission layer of a disk whose optical reading surface is covered with a light transmission layer made of resin by being rotationally driven. A cylindrical baffle in which a plurality of nonwoven fabrics in which abrasive grains are fixed to nylon fibers are fixed to the outer periphery of a cylindrical core to form a nonwoven fabric layer which is collectively compressed, and the baffle is sandwiched from both sides in the axial direction. A pair of disk-shaped attachments, wherein the attachment is a core abutting portion abutted against an axial end surface of the core of the baffle, and the attachment radially inner side than the core abutting portion. A support protrusion that projects and is inserted removably into the core body to support the baffle; and from the core body contact portion to the attachment radial outside. Number outer diameter than the nonwoven fabric layer m
a pressing plate portion protruding in a flange shape smaller by about m and being in contact with the nonwoven fabric layer from the outside in the axial direction of the baffle, wherein the baffle is sandwiched between the core contact portions of the attachments on both sides. In addition, the core body is supported outside the support protrusions of both attachments, so that the attachment can be rotationally driven integrally with the attachment by the rotational driving force transmitted to the attachment, and the nonwoven fabric layer is By being sandwiched between the holding plate portions of the attachments on both sides, a projecting portion projecting about several mm outside the holding plate portion is formed on the outer periphery of the nonwoven fabric layer. Buff unit for disk. 2. The non-woven fabric layer according to claim 1, wherein a plurality of non-woven fabrics extending along the axial direction of the core body are continuously arranged along the circumferential direction of the core body, and are collectively compressed. The disk buff unit according to claim 1. 3. A disk repairing device in which the disk buff unit according to claim 1 is mounted on a rotary drive shaft that is rotated by a drive mechanism, wherein the through hole formed in the center portion is rotated by rotating the disk buff unit. A pair of attachments penetrating the drive shaft and a baffle disposed between the pair of attachments by penetrating the space inside the core through the rotary drive shaft are detachably attached to one end of the rotary drive shaft. It is fixed by being pressed toward a supporting body attached to the other end of the rotary drive shaft by the attached pressing member, and is further removed by removing the pressing member from the rotary drive shaft. Wherein the attachment and the baffle can be removed from the rotary drive shaft. 4. A baffle having a grain size of 600 to 1500 is exchanged in several stages from a coarse grain size to a fine grain size of said abrasive grains by using the disk buff unit according to claim 1 or 2. A grinding step of grinding the resin permeable layer up to 0.5 mm from the reading surface of the disk, and polishing the surface of the permeable layer of the disk after the grinding step by mixing abrasive grains having a particle size of 1200 to 1800. In combination with the agent, the polishing performed by a baffle having a fibrous body layer made of a flexible fiber such as flannel or cotton on the outer peripheral portion, the abrasive grains having a coarser particle size in order from several stages to coarser ones Change the abrasive, with this,
A polishing step performed by also changing the baffle, and a polishing agent obtained by mixing the surface of the permeable layer of the disc after the polishing step with an abrasive obtained by mixing fine abrasive grains having a particle size of 2000 or more in a binder. A mirror finishing step of wiping the abrasive and then applying a coating agent after polishing.