JP2003317419A - Rotary disk-fixing sheet and method for manufacturing same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotary disk-fixing sheet co-possessing the properties, such as flexibility and coefficient of friction, considered to be necessary for the rotary disk-fixing sheet and the high dimensional accuracy in a thickness direction by applying a rubber raw material to a structure reinforcing film configurating a base material by using various kinds of coaters and to provide a method for manufacturing the same. <P>SOLUTION: The fixing sheet of, for example, an annular shape capable of freely attachably and detachably fixing the recording disk to a spindle of a disk drive unit for the rotary disk consists of the structure reinforcing film 12 of the required thickness configurating the base material and the rubber layer 14 of the required thickness consisting of liquid rubber applicable by using various kinds of the coaters on the films 12 as its raw material. The rubber layer 14 is so formed that the dimensional accuracy of its final thickness is kept within ±10 μm. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary disk fixing sheet and a method for manufacturing the same, and more specifically,
Particularly, it is suitably used as a ring-shaped fixing sheet used for a spindle of a disk drive device such as a rotating disk which requires high-speed rotation, and it is possible to prevent a slight vibration generated at a high-speed rotation and a longitudinal vibration of the CD. Greatly restrained,
The present invention relates to a rotary disk fixing sheet and a method for manufacturing the same, which enables stable reading of data from the rotary disk.

[0002]

2. Description of the Related Art In recent years, with the rapid spread of small general-purpose computers typified by personal computers and the increase in the capacity of various data used in the computers, a CD-recorder capable of handling a large amount of high-speed data is easy. A recording / reproducing disc such as an optical disc represented by a ROM has been highlighted.

Basically, as shown in FIG. 10, the recording / reproducing disc 60 has a ring-shaped fixing sheet 30 which can be detachably fixed to a spindle 52 which is a rotation axis of the disc 60 in a disc drive device 50. It is fixed by using it, and is rotated in this state for operations such as reading. The fixing sheet 3
At 0, the rotational movement of the spindle 52 is stably transmitted to the recording / reproducing disc 60 by preventing the displacement in the circumferential direction, and the warp, waviness and slight vibration of the recording / reproducing disc 60 generated at the time of rotation. The ability to suppress is needed,
A material such as rubber having flexibility and a high coefficient of friction has been suitably adopted in order to sufficiently exert the function. Further, the thickness of the fixing sheet 30 is generally set to about 200 to 500 μm in order to secure flexibility and the like.

Further, in order to achieve stable access to the recording / reproducing disk 60 during rotation, in addition to the physical properties such as flexibility and high friction coefficient described above, the dimensional accuracy of the fixing sheet 30 in the thickness direction is also increased. Is also required. By maintaining the dimensional accuracy in the thickness direction at a high level, the vertical shake of the recording / reproducing disc 60 during rotation is suppressed, and the pickup laser which controls the surface of the disc 60 and reading / writing from the disc 60. The distance to etc. will always be kept constant, and as a result,
Stabilization such as reading is greatly improved.

Calendering is known as a method of processing the rubber having the above-mentioned physical properties with high dimensional accuracy in the thickness direction. An example of steps for manufacturing the fixing sheet 30 by the calendering will be described below.
Prepare the raw material rubber. Knead this thoroughly. Then, by using two or more rolls, calendering with high dimensional accuracy in the thickness direction is performed to obtain a sheet-like material. Carry out vulcanization. The obtained vulcanized sheet-like material is subjected to punching processing or the like to obtain a fixing sheet 30 as a finished product in a required ring shape. The dimensional accuracy in the thickness direction of the fixing sheet 30 thus achieved is about 100,000 N / cm ² or more of the thickness (200 to 500 μm) of the sheet 30, that is, ± 20 to 5
It is about 0 μm (see FIG. 11).

On the other hand, the reading speed of the recording / reproducing disk 60 is 64, which is a general capacity of the disk 60.
In order to make full use of 0 megabytes, the speed has been increased according to technological progress, and recently, performance of about 50 times speed (150 kilobytes / second (1 times speed) × 50 = 7500 kilobytes / second) has become common. Is coming.

When the reading speed of the recording / reproducing disc 60 is increased as described above, the disc 6 is inevitably increased.
The rotation speed of 0 is also increased. Then, the deterioration of the stability of the recording / reproducing disk 60 at the time of rotation due to the increase in the rotation speed becomes a problem. In particular, the problem due to the destabilization of the distance between the disc 60 and the pickup laser, which is necessary for stable reading from the recording / reproducing disc 60, is serious, and in some cases, the precision of reading is large. It deteriorates, and the advantage of improving the rotation speed cannot be utilized.

It has been known that the deterioration of the accuracy of the above-mentioned reading becomes remarkable when the swing width of the recording / reproducing disk 60 in the vertical direction exceeds 20 μm. Then, in order to suppress this swing width to 20 μm or less, the dimensional accuracy of the fixing sheet 30 in the thickness direction must be within a range of ± 10 μm.

[0009]

However, the dimensional accuracy in the thickness direction when a sheet-like material is obtained by the calendering is greatly affected by the physical properties of the material, and is suitable for use as the material of the fixing sheet 30. In the case of the millable type rubber, it is difficult to further improve the dimensional accuracy in the thickness direction due to the high flow deformability of the rubber and the external force generated during the processing.

Therefore, the manufacturer of the disk drive for the recording / reproducing disk 60, after delivering the fixing sheet 30 to be used, before it is assembled to the disk drive device 50, it is unavoidable to perform dimensional accuracy in the thickness direction such as polishing. In order to use the dimensional accuracy in the thickness direction within the range of ± 10 μm, a processing operation for improving the above is separately performed. For this reason, there has been a problem that the number of manufacturing steps increases and the yield of the fixing sheet 30 that is an assembly component deteriorates, resulting in a large manufacturing cost.

[0011]

SUMMARY OF THE INVENTION The present invention has been proposed in order to preferably solve the above-mentioned drawbacks inherent in the rotary disk fixing sheet and the manufacturing method thereof according to the prior art, and various coaters are proposed. By adding a rubber raw material onto the structure-reinforced film that is the base material by using, the physical properties such as flexibility and friction coefficient required for the rotating disk fixing sheet and high dimensional accuracy in the thickness direction can be obtained. An object of the present invention is to provide a rotating disk fixing sheet having both and a manufacturing method thereof.

[0012]

In order to overcome the above-mentioned problems and to achieve the intended purpose, a rotary disk fixing sheet according to the invention of the present application attaches / detaches the recording disk to / from a spindle of a disk drive device for the rotary disk. For example, in a ring-shaped fixing sheet that can be freely fixed, it is necessary to use, as a raw material, a structure-reinforcing film having a required thickness as a base material and a liquid rubber that can be applied on the structure-reinforcing film by using various coaters. And a rubber layer having a thickness, and the final thickness dimensional accuracy of the rubber layer is within ± 10 μm.

In order to overcome the above-mentioned problems and to achieve the intended purpose, a method for manufacturing a rotary disk fixing sheet according to another invention of the present application is such that the recording disk can be freely attached to and detached from a spindle of a disk drive device for the rotary disk. Can be fixed to,
For example, in the method of manufacturing a ring-shaped fixing sheet,
By continuously supplying the structure-reinforcing film of the thermoplastic resin as the base material, and using various coaters for the liquid rubber raw material,
A rubber layer having a required thickness is formed on the structure-reinforcing film by applying it on the structure-reinforcing film so that the thickness dimensional accuracy is within ± 10 μm and proceeding the curing of the applied liquid rubber raw material. It is characterized by doing so.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Next, a rotary disk fixing sheet and a method for manufacturing the same according to the present invention will be described below with reference to the accompanying drawings with reference to preferred embodiments. The same reference numerals are given to the members and the like that have already been described with reference to FIG. 10, and the detailed description thereof will be omitted. In the description of the present invention, the term "liquid" indicating the property of the rubber raw material does not mean only a liquid such as water whose viscosity is extremely low, and is a miracle that indicates the property of a commonly used rubber raw material. The one used for the type.

The inventor of the present invention basically achieves a numerical value within ± 10 μm of the dimensional accuracy in the thickness direction as a rubber layer constituting a fixing sheet composed of a rubber layer and a structure-reinforcing film, thereby achieving high-speed rotation. It has been found that a rotating disk fixing sheet that can be suitably used below can be obtained. Further, as the structure-reinforcing film constituting the fixing sheet, the tensile elastic modulus (according to JIS K7161): 1
A rubber layer having a physical property of 0000 N / cm ² or more,
Hardness: Asker A hardness of 50 or less, coefficient of static friction:
It was also found that a more suitable rotary disk fixing sheet can be obtained by achieving the physical properties of 1.0 or more, respectively.

As shown in FIG. 1, a fixing sheet 10 according to a preferred embodiment of the present invention reads data from a recording / reproducing disc 60 (hereinafter, simply referred to as a disc) such as an optical disc represented by a CD-ROM. It is used for detachably fixing the disc 60 to the spindle 52 that rotates the disc 60 in the disc drive device 50 that implements the above. Further, the spindle 52 is rotated under the control of a spindle motor (not shown) as a power source. Although a so-called ring-shaped material is exemplified as the shape of the fixing sheet 10 here, the shape is not particularly limited to this, and a so-called C-ring-shaped material having a cut in one direction may be used. Good.

As shown in FIG. 2, the fixing sheet 10 has a structural reinforcing film 12 which is basically a base material, and a thickness of 5 to 200 μm on the structural reinforcing film 12.
And a low-friction layer 18 that partially covers the rubber layer 14. Further, in the actual manufacturing, the rubber layer 1 of the structural reinforcing film 12 is arranged so that the fixing sheet 10 can be easily attached to a required position of the spindle 52.
On the side where 4 is not formed, an adhesive layer 16 covered with a release material 16a is formed.

The structure-reinforcing film 12 is insufficient in strength only with the rubber layer 14 which can satisfy the requirements such as the thickness described above, and is caused by physical damage such as breakage or tearing caused by pulling or large deformation. In addition to improving product shape retention by avoiding product defects, manufacturing process (see [0032] below)
Also functions as a so-called base material for efficiently forming the rubber layer 14.

For the structure-reinforcing film 12 to serve as the base material, the spindle 5 is used.
A general shape-retaining property capable of withstanding a force applied at the time of attachment to 2, etc., and a tensile elastic modulus to such an extent that the assembling property at the time of the attachment can be secured are required. Regarding the shape retention, polyethylene terephthalate (P
There is no particular problem if a general thermoplastic resin such as ET) is used, and the tensile modulus is 100,000.
If it is N / cm ² or more, it can be used regardless of the type of material. From the tensile modulus, T (tensile modulus)
The tension related to the base material is obtained by the formula of × cross-sectional area × (ΔL (extended length of base material) / L (base length of base material)). obtain.

On the other hand, the fixing sheet 10 is the disk 6
In order to achieve a stable rotation by mounting 0, it is desired that its thickness is also 200 μm or less. From this point, the above-mentioned structure as a base material constituting the fixing sheet 10 is desired. The reinforcing film 12 is desired to have a thickness of about 50 μm or less. If the structure-reinforcing film 12 is too thick, the thickness of the rubber layer 14 is relatively reduced, resulting in a problem in physical properties such as flexibility, and in a manufacturing apparatus ([0033]) described later. This is because the number of windings of the structure-reinforcing film 12 and the like is reduced and the productivity is lowered in use.

Considering this thickness condition, concrete examples of the substance capable of achieving the above-mentioned shape retention and tensile modulus are polyester resin such as polyethylene terephthalate (PET), olefin resin, polyethylene resin, polystyrene resin, polyimide. , Polyamide, EPDM (ethylene propylene diene terpolymer) or EPM (ethylene propylene copolymer).
In particular, since PET resin is inexpensive, it is preferably used.

The rubber layer 14 serves as the fixing sheet 10.
, The main function required for the seat 10, that is, the function of suppressing the warp, waviness and slight vibration of the rotating disc 60 and transmitting 100% of the rotational force of the spindle 52 to the disc 60, etc. Is a member that is essential for stable rotation of the disk 60. In order to fully exhibit these functions, the rubber layer 14 has
Rubber, which is a typical material having flexibility and a high coefficient of friction, is preferably adopted.

The friction coefficient can be achieved by setting the hardness of the rubber layer 14 to a certain value or less, and the flexibility can be achieved by setting the thickness of the rubber layer 14 to a certain value or more. And the spindle 52 such as 50 times speed mentioned above
It is empirically known that a coefficient of static friction of 1.0 or more is sufficient as a coefficient of friction that can be transmitted to the disk 60 without idling the rotation speed of the rubber layer. The hardness of 14 is 50 as Asker A hardness.
The following is sufficiently achieved. It has been empirically known that sufficient flexibility is sufficient if the thickness of the rubber layer 14 is about 5 μm or more if the hardness of the rubber layer 14 is the above-mentioned value. If the hardness is too soft,
While the static friction coefficient becomes a sufficient value, the shape followability due to flexibility becomes high, and stickiness (see [0
[026]) becomes too strong, so it is more preferable to set its lower limit value to 20 as Asker A hardness and set it in the range of 20 to 50.

Examples of the material of the rubber layer 14 which can have such hardness and thickness include all thermosetting and thermoplastic rubbers such as urethane type and acrylic type, and are not particularly limited, but the fixing Since the use sheet 10 is a component of the disk drive device 50 incorporated as a part of a computer or the like that can be used in various environments, it can be used in a wide temperature range (particularly in a low temperature atmosphere of -30 ° C. or less). Silicone-based substances capable of maintaining the physical properties of are suitable.

The use of various coaters as a means for achieving the dimensional accuracy in the thickness direction within ± 10 μm (details will be described later in [00
33]) is determined depending on the state of the raw material of the rubber layer 14, that is, whether or not the viscosity is low. Therefore, a liquid material is suitable as the raw material. In addition, the type of coater used, for example, several tens of Pa
Although it can handle up to about S, it is difficult to use so-called millable type raw material because the viscosity must be low to the extent that there is viscosity, but the viscosity was reduced to the usable range of various coaters by using a required solvent. In some cases it can be used.

Further, the disk 6 is formed on the rubber layer 14.
Adhesion (hereinafter referred to as stick property) controlled to the extent that 0 can be easily removed from the spindle 52 is also required.
If the stickiness is too strong, the fixing sheet 10
It becomes difficult to attach and detach the disc 60 from the inside. In addition, there is a fear that fine dust in the air will stick to it. The stickiness is determined by the conformability of the rubber layer 14 to the disc 60, which changes depending on the hardness, and the contact area between the rubber layer 14 and the disc 60.

In the present invention, when the hardness is set to a level at which a sufficient transmission of the rotational force is achieved, the above-mentioned shape following property is also at a considerably high level, but there is a fear of deteriorating the transmissibility. Basically, the hardness cannot be changed. Therefore, in order to reduce and control stickiness, another method of reducing the contact area is preferably adopted in the present invention (details will be described later in [0028] and [005].
3]).

The low friction layer 18 is a layer partially formed on the rubber layer 14 with, for example, a pattern. When the low friction layer 18 is present, the disc 60 when the disc 60 is placed on the fixing sheet 10 is provided.
The contact area between the rubber layer 14 and the rubber layer 14 can be reduced to reduce stickiness. The layer thickness of the low-friction layer 18 is sufficient to cover the rubber layer 14 and not exhibit the stick property of the rubber layer 14, that is, 1 to 5 μm.

As the material of the low friction layer 18, a material having a good adhesiveness to the rubber layer 14 previously formed, that is, a material having a so-called familiarity is preferably adopted. For example, the rubber layer 14 is made of a silicone material. If it is, the low friction layer 1
The same silicone-based substance is also suitable for No. 8.

The adhesive layer 16 applies an adhesive agent to the opposite surface of the rubber layer 14 each time the fixing sheet 10 is attached to a required position of the spindle 52 of the disk drive device 50. It is formed for the purpose of improving the so-called handling property by eliminating the work such as the above. Therefore, the rubber layer 1 of the structure reinforcing film 12
A so-called adhesive sheet is laminated on the side where 4 is not formed,
The adhesive layer 16 is formed by uniformly applying an adhesive. In this case, in consideration of the handling property before being attached to the spindle 52, the peeling material 16a is applied to the outer surface of the adhesive layer 16 to protect the adhesive layer 16.

[0031]

[Example of Manufacturing Apparatus and Manufacturing Method] Next, an example of a suitable manufacturing apparatus for the fixing sheet 10 according to the present embodiment and a manufacturing method using the manufacturing apparatus will be described below. The structure-reinforced film 12 and the liquid rubber raw material M, which is the raw material of the rubber layer 14,
A low-friction liquid rubber raw material LM, which is a raw material of the low-friction layer 18, and a release material 16a provided with an adhesive that becomes the adhesive layer 16 are prepared. Here, the base of the fixing sheet 10 is coated by using a knife coater. The long sheet 20 is manufactured, and the fixing sheet 10 as the final product is obtained by post-processing such as punching.

As shown in FIG. 3, the fixing sheet 10 is basically manufactured by a raw material preparing step S1, a rubber layer forming step S2, a low friction layer forming step S3, an adhesive layer laminating step S4 and a final step S5. And is suitably manufactured by the manufacturing apparatus 70 shown in FIG. The manufacturing apparatus 70 basically performs the rubber layer forming step S2, the low friction layer forming step S3, the adhesive layer laminating step S4, and the final step S5, and the raw material preparing step S1 is a different apparatus. It has been implemented. The adhesive layer laminating step S4 may be performed before the rubber layer forming step S2 or the low friction layer forming step S3 (note [0049]).

(Outline of manufacturing apparatus) The manufacturing apparatus 70 manufactures the fixing sheet 10 with a knife coater so that the liquid rubber raw material M has a given thickness, that is, the dimensional accuracy of the rubber layer 14 in the thickness direction is within ± 10 μm. A roll mechanism 72 for transferring the structure-reinforcing film 12 and the like, a knife coater section 74 for applying the liquid rubber raw material M onto the structure-reinforcing film 12, and a predetermined length installed on the downstream side of the coater section 74. First tunnel-type heating furnace 76, a gravure coater section 78 for applying a low-friction liquid rubber raw material LM that partially covers the rubber layer 14 formed on the structural reinforcing film 12, and a downstream of the coater section 78. It is basically composed of a second tunnel heating furnace 80 having a predetermined length installed on the side. Further, various coaters typified by the knife coater provided in the knife coater unit 74 are characterized in that a substance having a low viscosity can be applied with high coating (application) weight accuracy, that is, high thickness dimensional accuracy, and a base material to be applied. (Structure reinforced film 12 in the present invention) has a feature that it can be applied with high smoothness, and can be said to be an indispensable device for achieving the object of the present invention.

The roll mechanism 72 basically includes the pressure-sensitive adhesive layer 16 including the structural reinforcing film 12 and the release material 16a.
A first supply roll 72a, which is one end for supplying / transferring the structure-reinforcing film 12, which is a mechanism for supplying / recovering to the manufacturing line while applying a predetermined tension to the
From the first supply roll 72a and the second supply roll 72b, which is one end for supplying and transferring the adhesive layer 16 with the release material 16a in a laminated manner with respect to the structural reinforcing film 12, The recovery roll 72c is configured to apply the required tension to the adhesive layer 16 together with the reinforcing film 12 and the release material 16a, which are respectively supplied. Each of these rolls 72a, 72b and 72c
Are driven by driving sources (not shown).

That is, the structure-reinforcing film 12 is wound around the first supply roll 72a, and the adhesive layer 16 with the release material 16a is wound around the second supply roll 72b. It is continuously supplied while being tensioned by the roll 72a and the recovery roll 72c, and the adhesive layer 16 with the release material 16a is continuously supplied while being tensioned by the second supply roll 72b and the recovery roll 72c. Is.

The knife coater unit 74 has a applying unit 74a for applying the liquid rubber raw material M on the structure-reinforcing film 12 under a predetermined tension under control.
A knife edge 74b having a required thickness of the liquid rubber raw material M which is installed and provided immediately downstream of the applying portion 74a.
And a pack-up roll 74c and a guide roll 74d for preventing twisting and bending of the supplied structure-reinforcing film 12 and performing suitable application. Further, one end of the applying part 74a is connected to a mixing / storing device for the liquid rubber raw material M (not shown). Then, by passing through the knife coater portion 74, the rubber raw material M is applied onto the structure-reinforcing film 12 to a required thickness with a dimensional accuracy of ± 10 μm in the thickness direction.

The first tunnel-type heating furnace 76 is a portion where the rubber layer 14 is obtained by heating the liquid rubber raw material M applied with a predetermined thickness under controlled control so that the rubber layer 14 is obtained. Any material can be adopted as long as it can sufficiently cure the liquid rubber raw material M. Also at this time,
Since the liquid rubber raw material M is on the structure-reinforced film 12 and cured, the liquid rubber raw material M and the structure-reinforced film 12 can be firmly laminated and integrated.

The gravure coater unit 78 is transferred under a predetermined tension, and the structure-reinforcing film 12 is transferred.
A low friction liquid rubber raw material LM for supplying the low friction liquid rubber raw material LM to the provision portion 78a under control of the low friction liquid rubber raw material LM.
And a pack-up roll 78c for preventing twisting and bending of the applied structure-reinforcing film 12 and carrying out suitable application. One end of the storage tank 78b is connected to a mixing / storing device (not shown) for the low-friction liquid rubber raw material LM. By passing through the gravure coater section 78, the liquid low friction rubber raw material LM for forming the low friction layer 18 for suppressing the high friction degree exhibited by the rubber layer 14 on the rubber layer 14 is applied to a required thickness. It

The second tunnel type heating furnace 80 is a portion for obtaining a low friction layer 18 by heating the liquid low friction rubber raw material LM provided with a predetermined thickness under controlled control so as to proceed with hardening. As with the first tunnel heating furnace 76, any material can be adopted as long as it can sufficiently cure the liquid low friction rubber raw material LM.

(Raw material preparation step S1) Main raw material preparation step S
1 is a coater to be used while mixing and kneading the liquid rubber raw material M forming the rubber layer 14 and the liquid low friction rubber raw material LM forming the low friction layer 18 as necessary.
By (knife coater or gravure coater here),
This is a process for adjusting the viscosity so that the dimensional accuracy can be imparted to the structure-reinforcing film 12 and is carried out by a mixing / storing device (not shown).

(Regarding Rubber Layer Forming Step S2) In the rubber layer forming step S2, the liquid rubber raw material M adjusted in the previous step S1 is applied onto the structural reinforcing film 12 in the thickness direction with the above-mentioned dimensional accuracy. Is a step of forming the rubber layer 14 that achieves the above-described dimensional accuracy by heating. Specifically, it is carried out by the knife coater unit 74 and the first tunnel heating furnace 76.

The rubber layer forming step S2 will be described in more detail.
4 is continuously supplied, and first, the pack-up roll 7
After passing through 4c and the guide roll 74d, the supply bending, meandering, etc. are corrected, and the liquid rubber raw material M is applied uniformly. Then, the liquid rubber raw material M is applied onto the structure-reinforcing film 12 in the applying portion 74a, and the required thickness is adjusted by the thickness controlling means knife edge 74b arranged immediately downstream thereof. afterwards,
When passing through the first tunnel type heating furnace 76, the temperature of the liquid rubber raw material M is raised to a temperature sufficient to cure the liquid rubber raw material M, and the liquid rubber raw material M is maintained for a certain period of time. A rubber layer 14 having a required thickness is formed on the structure reinforcing film 12.

With respect to the structure reinforcing film 12,
Before applying the liquid rubber raw material M, the surface of the structure-reinforced film 12 on which the liquid rubber raw material M is applied may be subjected to corona treatment or adhesive strength improving treatment using an adhesive or an adhesive.

Further, in an example of the present manufacturing method, a knife coater is used as a coater (the optimum viscosity of the liquid rubber raw material M to be used: 1 to
30Pa · S) is used, but the reverse roll coater is used depending on the viscosity of the liquid rubber material M to be used.
(Optimal viscosity: tens of Pa · S or less) may be used. Further, in order to reduce the contact area with the disk 60, the liquid rubber raw material M is not applied to the entire structure-reinforcing film 12, but a desired pattern and interval are obtained by using a rotary screen coater or the like. The rubber layer 14 that is partially applied and partially present may be formed. In this case, when the disc 60 is mounted on the disc drive device 50, the contact area between the disc 60 and the disc 60 to be fixed is reduced, and as a result, the stickiness is good between the two and the disc 60 can be easily attached and detached. Has the effect.

(Low friction layer forming step S3) In the low friction layer forming step S3, the liquid low friction rubber raw material LM adjusted in the previous step S1 and the rubber layer 14 obtained by performing the previous step S2 as well. Add it to the required thickness above,
It is a step of forming the low friction layer 18 by applying heat.
Specifically, it is carried out by the gravure coater unit 78 and the second tunnel heating furnace 80, and
044], it can be said that it is a step for reducing stickiness, similar to forming the rubber layer 14 on the structure-reinforcing film 12 with a desired pattern. This step S3
A method for reducing the stickiness other than the above-mentioned step will be described later ([0053]).

The friction layer forming step S3 will be described in more detail. The structure reinforcing film 12 having the rubber layer 14 is formed.
Is continuously supplied to the gravure coater section 78, and first, the pack-up roll 78c corrects the supply deflection, meandering, etc., and is in a state sufficient to uniformly apply the liquid low-friction rubber raw material LM. Then, the liquid low friction rubber raw material LM is partially applied on the rubber layer 14 in the applying portion 78a according to the shape of the applying portion 78a. When passing through the second tunnel heating furnace 80, the temperature of the liquid low-friction rubber raw material LM is raised to a temperature sufficient for curing and maintained for a certain period of time, and the curing of the raw material LM proceeds on the rubber layer 14. A low friction layer 18 having a required thickness is formed.

(Regarding Adhesive Layer Laminating Step S4) In the case of the manufacturing apparatus 70, the adhesive layer laminating step S4, that is, the laminating of the adhesive layer 16 with the structural reinforcing film 12 and the release material 16a is performed by the first tunnel type In order to avoid deterioration of the adhesive layer 16 due to heating in the heating furnace 76 and the second tunnel heating furnace 80, after passing through both tunnel furnaces 76 and 80 to be heated, that is, the rubber layer forming step S2 and low friction. This is performed after the layer forming step S3.

That is, in the rubber layer forming step S3, a second layer is installed on the downstream side of the first tunnel type heating furnace 76 so that the structural reinforcing film 12 can be laminatedly supplied.
This is performed by the supply roller 72b. The adhesive layer 16 accompanied by the release material 16a supplied by the second supply roller 72b is subjected to the above-described step S3, so that both layers of the structure-reinforcing film 12 having the rubber layer 14 and the low friction layer 18 are formed. The long sheet 20 is laminated on the side where 14 and 18 are not formed, and the long sheet 20 serving as the base of the fixing sheet 10 is obtained by this lamination.

Prior to the execution of the rubber layer forming step S2 or the low friction layer forming step S3, it may be carried out by the same method as described here. However, in this case, since the rubber layer forming step S2 or the low friction layer forming step S3 is performed, the heating by the first tunnel heating furnace 76 and / or the second tunnel heating furnace 80 is added, so that the deterioration is caused by the heat. Therefore, it is necessary to be careful. In addition, it is also possible to consider a configuration in which the structure reinforcing film 12 and the pressure-sensitive adhesive layer 16 with the release material 16a are preliminarily laminated outside the manufacturing apparatus 70 and are continuously supplied to the manufacturing apparatus 70. In this case, the division of labor and the like can be performed by previously laminating the structure reinforcing film 12 and the adhesive layer 16 together with the release material 16a in another step.

(Final step S4) Then, the long sheet 20 thus obtained becomes a finished product by processing the shape of the fixing sheet 10 to be obtained by punching, for example. Then, after performing necessary inspections and the like, the products are shipped. The long sheet 20 punched out from the fixing sheet 10 is sequentially wound around the recovery roll 72c. In addition, punching processing on the long sheet 20 is performed by the collecting roll 7
You may make it implement in another process after winding up to 2c one by one.

When the steps described in this example are used,
When the liquid rubber raw material M is cured on the structure-reinforcing film 12, the liquid rubber material M is also adhered at the same time, so that the adhesive strength is strong, and the effect of saving the labor of manufacturing in a separate step is exerted.

Further, in this embodiment, the rubber layer forming step S2 and the low friction layer forming step S3 are carried out continuously, but as shown in FIG. Manufacturing apparatus 90 that is implemented in the first manufacturing unit 90a and subsequent steps are implemented in the second manufacturing unit 90b.
May be used. In this case, a mechanism similar to the roll mechanism 72 has the first manufacturing unit 90a and the second manufacturing unit 90.
The first roll mechanism 91 and the second roll mechanism 9 are provided on both sides of b.
2 respectively, and the structure reinforcing film 1 supplied from the first supply roll 91a in the first manufacturing unit 90a.
2 is the first recovery roll 91 after the rubber layer 14 is formed.
It is wound up and collected by b. Then, the first recovery roll 91b is used as it is as the second A supply roll 92a of the second roll mechanism 92 constituting the second manufacturing unit 90b, and after the low friction layer 18 is formed, the second recovery roll 91b is removed from the second B supply roll 92b. The pressure-sensitive adhesive layer 16 with the release material 16a is supplied in a laminated manner, and is wound and collected by the second collecting roll 92c to complete the long sheet 20. It should be noted that the members constituting the respective manufacturing units 90a and 90b, which have been already described in the manufacturing apparatus 70, are designated by the same reference numerals, and the description thereof will be omitted.

[0053]

[Other Manufacturing Method] In one example of the above manufacturing method, the rubber layer 14 exhibiting a high friction coefficient is formed on the entire structure-reinforcing film 12, and the sticking property by the friction coefficient is formed.
(See [0027]) to reduce the low friction layer 18
Was partially formed to facilitate the attachment / detachment of the disk 60 fixed on the fixing sheet 10 thus manufactured. Since this phenomenon is determined by the high friction coefficient of the rubber layer 14 and the contact area with the disk 60, a method of reducing the friction coefficient of the rubber layer 14 by adjusting the rubber material M or the like can be considered. . However, in the case of this method, the raw material system needs to be modified, and not only the coefficient of friction but also other important physical properties, that is, the viscosity and the curability, may be greatly affected, so that it is not practical.

Therefore, the sticking property is reduced by reducing the contact area between the rubber layer 14 and the disk 60 to be fixed without changing the friction coefficient of the rubber layer 14 unlike the low friction layer 18 described above. A suppression method is preferably adopted. Specifically, as shown in FIG. 6, the rubber layer 14 is placed in the rubber raw material M in the raw material preparing step S1 in the form of a powder 19 of low friction material.
Rubber (see FIG. 6 (a)), or by spraying the powder 19 on the rubber raw material M having a required thickness before curing (see FIG. 6 (b)). The powder 19 on the surface of the layer 14
And a method described in [0044] in which the contact area is reduced by partially forming the rubber layer 14 on the structure-reinforcing film 12.

The method of mixing the powder 19 of the low-friction material described above is the same as the powder 1 of the required amount in the raw material preparing step S1.
9 should be mixed and dispersed sufficiently. As the powder 19 of the low friction material, a substance having a low critical surface tension such as a fluorine resin or a silicone resin is suitable.
Further, the weight of the rubber raw material M: the weight of the powder 19 of the low friction material is preferably about 1: 0.01 to 1: 0.5, and if the amount of the powder 19 is small, a sufficient effect can be obtained. If it is not, and if it is too large, it becomes difficult to knead, and there is a problem that the powder 19 falls off due to sliding during use of the product. Further, the powder 19 used by mixing and dispersing in the rubber raw material M is preferably one having a specific gravity smaller than that of the raw material M, that is, so-called non-precipitation. In addition, the low-friction material powder 19 may be uniformly dispersed before the curing treatment by heating, that is, on the applied liquid rubber raw material M.

Regarding the particle size of the powder 19 of the low-friction material, when the powder 19 is kneaded with the rubber material M,
As shown in Fig. 7, the thickness is preferably about 1 to 2 times the thickness of the rubber layer to be formed. Below this, the ratio of the powder 19 exposed on the surface of the rubber layer 14 decreases (Fig. See a)),
As a result, stickiness cannot be reduced efficiently,
If it exceeds this, the rate of exposure on the surface of the rubber layer 14 increases, and there is a fear that the powder 19 will fall off due to sliding during use of the product (see FIG. 7B). When the powder 19 of low friction material is sprinkled and fixed on the rubber layer 14, the thickness of the rubber layer 14 has no relation to the particle size of the powder 19, as shown in FIG. Although the diameter is small and stickiness can be reduced, it may drop off during use depending on the degree of sticking of the powder 19 as in the case of the above-mentioned kneading. Therefore, it is preferably as small as possible.

[0057]

[Experimental Example] An experimental example is shown below with respect to changes in various physical properties due to the thickness of the rubber member and the like constituting the rotary disk fixing sheet according to the embodiment.

(Materials Used, etc.) The following materials were used as the respective members constituting the rotary disk fixing sheet, and according to the contents of Table 1, [Example of manufacturing apparatus and manufacturing method] ([0031] The sheet was prepared as a fixing sheet by the production method described in (1). The constitutions of Example 1, Comparative Example 1 and Comparative Example 2 were composed of a rubber layer, a structural reinforcing film and an adhesive layer, and the constitutions of Example 2 were composed of a rubber layer (a powder mixture with low friction), a structural reinforcing film and an adhesive layer. The structure of Example 3 includes a low-friction layer, a rubber layer, a structure-reinforcing film and an adhesive layer formed on the rubber layer in a circular pattern so as to cover half of the surface area, and the structure of Example 4 includes a rubber layer (embossing: Half of the surface area), a structure-reinforcing film and an adhesive layer, respectively.・ Structural reinforcement film: PET film; thickness 50 μm ・ Rubber raw material: Thermosetting silicone rubber (trade name
TSE3032: GE Toshiba Silicone) ・ Low friction rubber material: Thermosetting silicone hard coat
(Product name SHC: GE Toshiba Silicone) ・ Low friction powder: Product name Tospearl 145: GE Toshiba Silicone (particle size 4.5 μm)

[0059]

[Table 1]

(Measurement Items and Measurement Method) 1: Tensile Elastic Modulus of Structure Reinforcement Film: Measured in accordance with JIS K7161. 1
When it is, 000,000 N / cm ² or more, it is evaluated as ◯. 2: Dimensional accuracy of rubber layer in the thickness direction: Dial type thickness meter PEACO
CK No. 5 (minimum scale: 0.001 mm) measures 4 points apart from the center of the fixing sheet by 90 degrees from the center of the fixing sheet, and the difference between all the measured values is ± 10.
When it is less than μm, it is evaluated as ◯. Hardness: Measured by Asker A hardness. When it is 50 or less, it is evaluated as ◯. Static friction coefficient: An inclination type static friction coefficient measuring device (HEIDENTYPE10) 100 as shown in FIG. 9 is used, and the fixing sheet 1 is attached to the polycarbonate inclined surface 102.
Place 0. Then, a general-purpose CD-ROM is placed on the fixing sheet 10 in the same manner as when the spindle of the disk drive device is placed, and a load of 1960 N is applied from above. After mounting the CD-ROM, the inclined surface 1
The tilt angle 02 is changed, and the tilt angle θ when the CD-ROM moves is measured. Then, the tilt angle θ is calculated from ta
If nθ is calculated and the value of tanθ is 1.0 or more,
If it has a sufficient coefficient of friction and is highly ticked, it is evaluated as ◯, and if less than 1.0, it is evaluated as x. 3: Stick (adhesion) property as a whole: A CD-ROM was placed on a fixing sheet 10 whose stickiness is to be evaluated under a load of 500 g under the conditions of a temperature of 80 ° C. and a time of 72 hours. Place it. After 72 hours, the temperature is returned to room temperature, the fixing sheet 10 is placed on the upper side, and the CD-ROM is placed on the lower side, and the time until the CD-ROM falls under its own weight is measured. If this value exceeds 10 seconds, the stickiness is evaluated as high, and if it is between 0 and 10 seconds, the evaluation is ◯. Overall evaluation: Considering the measurement results up to, the overall evaluation was evaluated as ◎: very good, ○: excellent, △: somewhat difficult to use, ×: not suitable for use .

(Results) The respective measurement results obtained according to the above-mentioned measurement method are also shown in Table 1 above. Basically, was determined by each material used, and all were evaluated as ○. Regarding the friction coefficient, the thickness of the rubber layer is 4μ
For the comparative example with m, the specified value could not be achieved.
Regarding the stick property, Comparative Example 1 or 2 in which the thickness of the rubber layer is 4 μm or 210 μm is Δ to ◯, respectively.
Or it is an evaluation of × and it is considered that problems will occur in actual use. Further, the evaluation of the stickiness is slightly low in Example 1 in which the low friction layer is not provided and the rubber layer is not partially formed or the powder having the low friction property is not used, that is, the so-called non-stick property is not considered. It was a thing.

[0062]

As described above, according to the rotary disk fixing sheet and the method of manufacturing the same according to the present invention, the rubber raw material is applied onto the structure-reinforced film as the base material by using various coaters such as a knife coater. By doing so, it has become possible to manufacture a rotary disk fixing sheet that has both the physical properties required for the rotary disk fixing sheet, such as flexibility and friction coefficient, and high dimensional accuracy in the thickness direction.

[Brief description of drawings]

FIG. 1 is a perspective view showing a disk drive device using a rotary disk fixing sheet according to a preferred embodiment of the present invention.

FIG. 2 is a cross-sectional view of a rotary disc according to an embodiment.

FIG. 3 is a flowchart showing steps of manufacturing a fixing sheet according to an example.

FIG. 4 is a schematic view showing an example of a manufacturing apparatus for manufacturing the fixing sheet according to the embodiment.

FIG. 5 is a schematic view showing an example of another manufacturing apparatus for manufacturing the fixing sheet according to the embodiment.

FIG. 6 is a cross-sectional view showing a state of powder of a low-friction material mixed / dispersed (FIG. 6 (a)) or dispersed (FIG. 6 (b)) in a rubber layer.

FIG. 7 is a schematic diagram showing the relationship between the particle size of the powder of the low-friction material mixed and dispersed in the rubber layer and the falling property of the powder.

FIG. 8 is a schematic diagram showing the relationship between the particle size of the powder of the low-friction material scattered on the surface of the rubber layer and the falling property of the powder.

FIG. 9 is a schematic diagram showing an evaluation device for evaluating stickiness according to an experimental example.

FIG. 10 is a perspective view showing a disk drive device using a rotary disk fixing sheet according to a conventional technique.

FIG. 11 is a schematic sectional view of a fixing sheet according to a conventional technique.

[Explanation of symbols]

10 Fixing sheet 12 Structural reinforcement film 14 rubber layer 16 Adhesive layer 18 Low friction layer M Liquid rubber raw material LM Liquid low friction rubber raw material

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Masafumi Sato             2-70, Kamino-cho, Atsuta-ku, Nagoya-shi, Aichi               Rogers Inoac Co., Ltd. F-term (reference) 5D138 RA05 RA11 SA19 TA02 TA48

Claims (19)

[Claims] 1. A structure-reinforcing film (12) having a required thickness as a base material, for example, in a ring-shaped fixing sheet capable of detachably fixing the recording disk to a spindle of a disk drive device for a rotating disk. , A rubber layer of a required thickness made of liquid rubber that can be applied on the structure-reinforced film (12) by using various coaters
(14), and the final thickness dimensional accuracy of the rubber layer (14) is within ± 10 μm, a rotary disk fixing sheet. 2. The rotary disk fixing sheet according to claim 1, wherein the rubber layer (14) has an Asker A hardness of 50 or less. 3. The rotary disk fixing sheet according to claim 1, wherein a silicone-based material is used as the liquid rubber forming the rubber layer (14). 4. The rotary disk fixing sheet according to claim 1, wherein the coefficient of static friction exhibited by the rubber layer (14) is set to 1.0 or more. 5. The rubber layer (14) has a thickness of 5 to 200 μm.
The rotating disk fixing sheet according to any one of claims 1 to 4, which is set to m. 6. The rotation according to claim 1, wherein a polyester resin, an olefin resin, a polyethylene resin, a polystyrene resin, a polyimide, a polyamide, an EPDM, an EPM, or the like is used as the structural reinforcing film (12). Disc fixing sheet. 7. The JIS K of the structural reinforcing film (12)
Tensile modulus according to 7161 is 100,000 N /
The rotating disk fixing sheet according to any one of claims 1 to 6, which is set to have a size of cm ² or more. 8. The rotating disk fixing sheet according to claim 1, wherein the structural reinforcing film (12) is fixed in a laminated manner when the rubber layer (14) is molded. 9. The rotating disk according to claim 1, wherein an adhesive layer (16) is formed on a side of the structural reinforcing film (12) where the rubber layer (14) is not formed. Seat for fixing. 10. The rubber layer (1) is formed by forming a low friction layer (18) so as to partially cover the surface of the rubber layer (14).
The rotating disk fixing sheet according to any one of claims 1 to 9, wherein the adhesion exhibited by the high friction coefficient of 4) is suppressed. 11. The low friction layer (18) is made of a material having good adhesion to the material of the rubber layer (14) to be coated, according to claim 1. Seat for fixing the rotating disc. 12. A structure-reinforced film of a thermoplastic resin as a base material in a method for producing a fixing sheet, for example, a ring shape, capable of detachably fixing the recording disk to a spindle of a disk drive device for rotating disks. 12) is continuously supplied, and the liquid rubber raw material (M) is applied on the structure reinforced film (12) so that the thickness dimensional accuracy is within ± 10 μm by using various coaters. By advancing the curing of the liquid rubber raw material (M), a rubber layer having a required thickness on the structure-reinforcing film (12).
(14) The method for manufacturing a rotating disk fixing sheet, characterized in that the sheet is formed. 13. The rotary disk fixing sheet according to claim 12, wherein the liquid rubber raw material (M) is a material in which the hardness of the rubber layer (14) obtained after curing is 50 or less in Asker A hardness. Production method. 14. The method for manufacturing a rotary disk fixing sheet according to claim 12, wherein the structure-reinforcing film (12) has been subjected to an antistatic treatment in advance. 15. The adhesive force is applied to the side surface of the structure-reinforced film (12) to which the liquid rubber raw material (M) is applied by corona treatment or the like prior to the application of the liquid rubber raw material (M). Item 15. A method of manufacturing a rotating disk fixing sheet according to any one of Items 12 to 14. 16. The side surface of the structure-reinforcing film (12) to which the liquid rubber raw material (M) is applied, is provided with an adhesive force in advance by using an adhesive component such as slight adhesion prior to applying the liquid rubber raw material (M). The method for manufacturing a rotating disk fixing sheet according to any one of claims 12 to 14, wherein application is performed. 17. A rubber layer (before the liquid rubber raw material (M) is applied to the structure-reinforcing film (12) or by curing the liquid rubber raw material (M) applied to the structure-reinforcing film (12). The rotary disk fixing according to any one of claims 12 to 16, wherein after the step (14), an adhesive layer (16) is formed on the side of the structural reinforcement film (12) where the rubber layer (14) is not formed. Sheet manufacturing method. 18. The type of coater for applying the liquid rubber raw material (M) onto the structure-reinforced film (12) is appropriately selected according to the viscosity of the liquid rubber raw material (M).
7. The method for manufacturing a rotating disk fixing sheet according to any one of 7). 19. The liquid low friction rubber raw material (LM) is partially applied on the rubber layer (14) by using a gravure coater or a screen coater, and the liquid low friction rubber raw material (LM) applied. By advancing the curing of the rubber layer (14)
The method for manufacturing a rotating disk fixing sheet according to any one of claims 12 to 18, wherein the low friction layer (18) is partially formed on the upper portion.