JP3924391B2 - Lamp member for storage device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a lamp member that is a constituent member of a large-capacity storage device of an information processing apparatus, and more particularly to a lamp member having high positional accuracy.
[0002]
[Prior art]
One important component of an information processing apparatus such as a computer is a storage device that stores data. Among them, magnetic storage devices such as hard disks have been built into most information processing devices because they can be accessed at high speed and have a large capacity.
[0003]
In addition, with the recent spread of mobile computing, a lighter, thinner and smaller hard disk with a large capacity has been demanded. Currently, a hard disk exceeding 2.5 GB and exceeding 10 GB has been developed. Furthermore, a hard disk with a size of 1.3 inches or less in the form of a type II or type III PC card conforming to the PCMCIA standard has been developed. In the 2.5-inch large-capacity small hard disk, for example, five disks are built in, and both surfaces of each disk are used as information storage surfaces, and are fixed to an arm with respect to a magnetic disk that is rotationally driven by a spindle motor. A magnetic head (slider or transducer) attached to the tip of the suspension rotates to read a predetermined data area or write data.
[0004]
The magnetic head floats through a very thin layer of air so that it does not directly contact the magnetic surface of the magnetic disk.
[0005]
When the head is on standby, the arm on which the head is mounted is fixed by some means in order to avoid unnecessary contact of the head with the data area of the disk. Generally, it has a mechanism for moving an arm to a member attached to an apparatus housing located on the side of a disk called a lamp so as to stay at a predetermined position of the lamp. Disc drive devices having such a lamp are disclosed in US Pat. Nos. 4,933,785, 5,235,482 and 5,034,837.
[0006]
Here, the role of the lamp will be described with reference to the drawings. As shown in FIG. 10A, the arm in the standby state has an arm 26 on the constricted portion 22 provided on the sliding surface 21 of the lamp member 20. An engaging portion provided at the tip or midway of the suspension 27 is locked. At this time, the suspension 27 is deflected to the outside with respect to the disk 25, and it is difficult for the suspension 27 to come off from the constricted portion 22 by the repulsive force.
[0007]
When the arm is driven, the arm slides on the sliding surface 21 in the direction of the spindle motor at the center of the disk and moves to the tip of the ramp member (FIG. 10B), and further onto the disk 25 as shown in FIG. 10C. Move.
[0008]
Such a lamp member is attached to the housing of the storage device, and is screwed with a flange portion 24 provided in the lamp main body portion 23. It has been proposed to use a molded product such as resin or ceramic for the lamp member. Ceramic material has high mechanical strength and easy to ensure dimensional accuracy, but since it is a rigid material, it is necessary to separately form a material with high slidability on the sliding part of the suspension by sputtering method, There is a problem that the cost is very high. On the other hand, what is resin-molded is inexpensive, but when integrally molding with one type of resin, if the mechanical strength of the main body is prioritized, the sliding property of the sliding part is sacrificed, In the prior art, a method in which a metal flange material is insert-molded in a portion where the mechanical strength of the main body portion is insufficient is used using a material having high slidability.
[0009]
However, generally, a resin material having high slidability has a large coefficient of linear expansion, and therefore shrinks after insert molding, so that it is difficult to ensure dimensions, and misalignment is likely to occur. In particular, when applied to a large-capacity small hard disk, the allowable tolerance of the pitch between sliding parts becomes even tighter, and even if a slight deviation occurs, the lamp member contacts the disk and normal rotation of the disk is prevented. Problems such as obstruction and landing of the head on the disk are not normal.
[0010]
Conventionally, in order to cope with this, there is a method for securing the dimensional accuracy between pitches by attaching to a housing and inserting a metal piece between the main body part supporting each sliding part and the sliding part. It was taken.
[0011]
[Problems to be solved by the invention]
By inserting the metal piece in this way, ensuring the dimensional accuracy is achieved, but the manufacturing process is complicated, and there is a risk of damage to the mold when the metal piece comes into contact with the mold. .
[0012]
In addition, there is a problem that the weight of the lamp member itself increases due to the insertion of the metal material, which is not desirable from the viewpoint of reducing the thickness and thickness.
[0013]
On the other hand, it is possible to obtain a dimensional accuracy only with a material having high slidability by forming a sink relief structure with an average thickness of about 0.4 to 0.5 mm. However, since such a molded product is taken out from the mold and then subjected to pure water cleaning, providing such a sink escape structure results in poor liquid drying and results in increased costs.
[0014]
Therefore, the object of the present invention is required for the sliding portion with high rigidity required for the main body portion without providing insert molding of metal material or sink relief structure while ensuring the dimensional accuracy of the sliding portion pitch. An object of the present invention is to provide a lamp member having both high slidability.
[0015]
[Means for Solving the Problems]
As a result of diligent studies to solve the above-mentioned problems, the main part is molded by the primary side with a material that is easy to ensure dimensional accuracy, and the sliding part is molded by the secondary side molding with a material having high slidability. By forming the ramp member, it is possible to provide a ramp member that ensures the pitch dimension accuracy of the sliding portion while satisfying the characteristics required for the main body portion and the sliding portion, respectively. That is, according to the present invention, an arm equipped with a head for reading / writing information corresponding to movement on the information storage surface of a disk-shaped storage medium is stopped during standby and guided to move onto the information storage surface during driving. The lamp member is a lamp member that attaches the lamp member to the housing of the storage device. The body of the lamp member is made of a resin material having high mechanical strength, and the sliding portion on which the arm slides is highly slidable. The lamp member is made of a resin material, and the main body and the sliding portion are integrally formed by two-color molding.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is a side view of a lamp member 1 according to an embodiment of the present invention, in which a main body portion 11 for mounting on a housing of a storage device such as a hard disk and a sliding portion in which an engaging portion of the head contacts. The main body 11 includes a mounting portion 11a in which a flange hole 13a for screwing to the hard disk housing and a positioning hole or pin 13b are formed, and a sliding portion 12. The support part 11b used as a support. The sliding portion 12 is formed with a constricted portion 14 for mooring the head when the head is waiting.
[0017]
Such a ramp member 1 is installed adjacent to the disk 4 in the hard disk drive as shown in FIG. This figure shows the head in a standby state, and a suspension 2 having a recording / reproducing head mounted on the recording surface of the disk is attached to the tip of the head arm 3. The lamp member 1 is screwed at a flange hole 13a portion to a housing 5 integrally molded by aluminum die casting or the like. When the head is driven, information can be recorded / reproduced by the head engaging portion sliding on the sliding surface of the ramp member 1 and moving in the arrow direction on the disk, or moving in the opposite direction.
[0018]
FIG. 3 is a perspective view of a lamp member optimized for a storage device having five disks. One sliding portion 12 is formed at a predetermined pitch for each disk. . Each disk is inserted in a non-contact manner into the disk insertion portion 16 of the sliding portion 12, and the head engaging portion slides on the sliding surfaces 15 on both sides of each sliding portion 12 from the end of the disk insertion portion 16 side. However, it is moored to the constricted portion 14. Reference numeral 17 denotes a member for preventing the head from jumping and is not essential.
[0019]
FIG. 4 shows a state in which the main body portion 11 and the sliding portion 12 are separated for convenience in the lamp member shown in FIG. Here, although the structure which provided the projection part 18 corresponding to each sliding part in the sliding part 12 attachment surface of the main-body part 11 is shown, it is not limited to this.
[0020]
In the present invention, the main body 11 is first subjected to primary side molding using a resin material having high mechanical strength. As the resin material having high mechanical strength, a material having high rigidity and close to the linear expansion coefficient (2.4 × 10 ⁻⁵ K ⁻¹ ) of aluminum is preferable, and polyether such as “ULTEM” (GE, trade name) is preferable. Examples thereof include resin materials obtained by reinforcing polyimide such as imide, “AURUM” (trade name) manufactured by Mitsui Chemicals, polycarbonate, and the like by adding fillers such as carbon fiber and glass fiber. Preferably, it has a linear expansion coefficient of about 0.1 to 0.3 × 10 ⁻⁴ K ⁻¹ . In addition, since the carbon fiber reinforced material has a certain degree of conductivity (surface resistivity is approximately 10 ¹ to 10 ¹² , preferably 10 ¹ to 10 ⁸ Ωcm), the generated static electricity can be released to the casing, There is also a prevention effect.
[0021]
The amount of filler added is not particularly specified, and may be adjusted so as to obtain desired mechanical strength and linear expansion coefficient, but is generally 5 to 60% by weight, more preferably about 30 to 50% by weight. It is.
[0022]
Next, the main body part 11 which is a primary molded product taken out from the mold for primary side molding is inserted into the mold for secondary side molding, and the secondary side molding of the sliding part 12 is performed. The material of the sliding portion 12 is a material having a low coefficient of friction and less generation of wear powder, for example, an injection-moldable thermoplastic resin blended with a fluororesin such as polytetrafluoroethylene (PTFE), for example, Examples thereof include polyester, and “Vectra A430” (trade name, manufactured by Polyplastics Co., Ltd.) is available. Moreover, it can also be used individually by fluororesins, such as PFA, EPE, and FEP. Furthermore, slidability is further improved by optimizing the resin orientation in consideration of the position of the resin injection port (gate).
[0023]
In addition, a common requirement for the main body portion and the sliding portion is to use a material with less outgas. When outgas, particularly chlorine gas or silicon, is generated, there is a concern about the adverse effect on the magnetic layer of the disk.
[0024]
In the present invention, as shown in FIG. 5, since the main body and the sliding portion are formed of different materials, high dimensional accuracy can be maintained without forming a sink escape structure in the main body, and the sliding portion. In order to maintain the high dimensional accuracy obtained in the main body, the thickness of at least the sliding surface is 0.1 to 1.0 mm, preferably 0.1 to 0.5 mm. In addition, when there are a plurality of sliding portions, when forming each sliding portion, it is possible to inject materials from different gates to form independent sliding portions. Thereby, the sliding part with uniform resin orientation can be obtained. Further, as shown in FIG. 6, a continuous groove or a discontinuous groove along the sliding surface is formed in the main body portion 11 at the contact surface between the lower end of the sliding surface of the sliding portion 12 and the main body portion 11. In addition, by providing the protrusion 12a in the lower end direction of the sliding surface of the sliding portion and forming the protrusion 12a so as to fit into the groove, it is possible to prevent the sliding portion from peeling in the lateral direction.
[0025]
In the present invention, it is more preferable to provide a separation preventing means such as a protrusion or a dent in the main body part or the sliding part so that the main body part and the sliding part are not easily separated. In particular, as shown in FIGS. 7 and 8, two-color molding is performed by the core back method, and a hole 11 c is provided in the main body 11 to be molded on the primary side. As shown in the cross-sectional view of FIG. 7, a step is provided in the middle of the hole, and then the molding core is moved backward to form the secondary sliding portion 12 to fill the hole. Thus, the pin 12b having a step corresponding to the shape of the hole is formed in the sliding portion 12. Thus, by providing the hole 11c which has a level | step difference in a main-body part, and forming the pin 12b fitted to this in the sliding part 12, the structure which a main-body part and a sliding part do not isolate | separate can be formed. In the perspective view of FIG. 8, the sliding portion is shown separately for convenience.
[0026]
By changing the number of disks loaded in the storage device, it is necessary to change the number of sliding parts correspondingly. For this purpose, a plurality of corresponding molds must be prepared. Therefore, the number of molds to be created can be reduced by using a combination of a plurality of lamp members having at least one sliding portion. For example, if a lamp member having one sliding portion and a lamp member having two sliding portions are arbitrarily combined, various numbers can be accommodated.
[0027]
【Example】
EXAMPLES Hereinafter, the present invention will be specifically described with reference to examples, but the present invention is not limited thereto.
[0028]
Example 1
First, the main body part 11 is molded as a primary side molding. As the resin material of the main body 11, a material in which 30% by weight of glass fiber was blended with “ULTEM” (GE, trade name) was used. Here, as shown in FIG. 4, a main body having five protrusions 18 is formed on the mounting surface of the sliding portion 12. In molding, it is preferable to mold so that the resin injection part (runner part) and the gate part to the mold do not cover the sliding part mounting surface.
[0029]
The primary side molding main body 11 is taken out of the mold, and the secondary side molding of the sliding portion 12 is performed. Use of an apparatus employing a core rotation method as the molding apparatus is preferable because the transition to the secondary side molding is smooth. As the resin material of the sliding part 12, “Vectra A430” (manufactured by Polyplastics Co., Ltd., trade name) was used.
[0030]
The lamp member 1 formed in this manner has both the mechanical characteristics required for the main body and the high slidability required for the sliding part, and the dimensional accuracy is within the allowable tolerance range.
[0031]
Example 2
A lamp member was formed in the same manner as in Example 1 except that carbon fiber was added to the filler added to the resin material of the main body. When the specific resistance of the main body was measured, it was about 10 ¹ to 10 ³ Ωcm, and it had sufficient conductivity to release static electricity.
[0032]
Example 3
A lamp member having five sliding portions was manufactured by combining the lamp member 1a having one sliding portion and the two lamp members 1b having two sliding portions as shown in FIG. At this time, the positioning can be facilitated by forming the positioning holes and pins formed in the attachment portions 11a of the main body portions 11 so that the pins fit into the holes on the surfaces where they are overlapped.
[0033]
【The invention's effect】
As described above, according to the present invention, the main body portion is molded on the primary side with a material that is easy to ensure dimensional accuracy, and the sliding portion is molded on the secondary side with a material having high slidability by a two-color molding method. By forming the ramp member, it is possible to provide a ramp member that ensures the pitch dimension accuracy of the sliding portion while satisfying the characteristics required for the main body portion and the sliding portion, respectively. In particular, since there is no need to form a sink relief structure, the dryness of the liquid when washed with pure water after molding is good, and the cost increase can be suppressed.
[0034]
In addition, the addition of carbon fiber to the filler added to the main body has an antistatic effect.
[0035]
Moreover, the sliding part which maintained the dimensional accuracy of the main-body part as it is can be formed by the thickness of the sliding part being at least 0.1 to 1.0 mm.
[0036]
Furthermore, by arbitrarily combining a plurality of lamp members having at least one sliding portion, it is possible to cope with a storage device having various numbers of disks without increasing the number of dies.
[0037]
In the above description, the hard disk device has been described as an example of the storage device. However, the present invention is not limited to this, and the ramp member of the present invention can be used in various storage devices adopting the ramp loading method.
[Brief description of the drawings]
FIG. 1 is a side view of a lamp member according to an embodiment of the present invention.
FIG. 2 is a plan view showing a main part of a storage device to which the lamp member of the present invention is applied.
FIG. 3 is a perspective view of a lamp member having five sliding portions according to an embodiment of the present invention.
4 is an exploded perspective view in which the lamp member of FIG. 3 is exploded into a main body portion and a sliding portion for convenience.
FIG. 5 is a partially cut perspective view of a lamp member according to another embodiment of the present invention.
FIG. 6 is a partially cut perspective view of a lamp member according to another embodiment of the present invention.
FIG. 7 is a partially cut perspective view of a lamp member according to another embodiment of the present invention.
8 is an exploded perspective view in which the lamp member of FIG. 7 is exploded into a main body portion and a sliding portion for convenience.
FIG. 9 is a plan view illustrating an embodiment in which lamp members are used in combination.
FIG. 10 is a conceptual diagram illustrating the function of a lamp member.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Lamp member 11 Main-body part 11a Attachment part 11b Support part 11c Hole 12 Sliding part 12a Protrusion part 12b Pin 13a Flange hole 13b Positioning hole or pin 14 Constriction part 15 Sliding surface 16 Disc insertion part 17 Jumping prevention member 18 Protrusion part

Claims (9)

A ramp member for stopping an arm equipped with a head for reading / writing information in correspondence with movement on an information storage surface of a disk-shaped storage medium during standby and guiding the movement onto the information storage surface during driving The lamp member main body for attaching the lamp member to the storage device housing is made of a resin material having a high mechanical strength and having a linear expansion coefficient of 0.1 to 0.3 × 10 ⁻⁴ K ^−1. The sliding part having a sliding surface on which the arm slides is made of a highly slidable resin material, and the main body part and the sliding part are integrally formed by two-color molding. After forming a convex protrusion in a shape corresponding to the sliding surface of the first molding, the sliding portion is secondarily molded by engaging with the protruding portion, and the thickness of the sliding surface of the sliding portion is reduced to 0. A lamp member having a thickness of 1 to 1.0 mm .   The lamp member according to claim 1, wherein a plurality of sliding portions are formed at a predetermined pitch with respect to the main body portion.   The lamp member according to claim 2, wherein a plurality of sliding portions are formed independently of each other with respect to the main body portion.   In the contact surface between the lower end of the sliding surface of the sliding portion and the main body portion, a groove is formed continuously or discontinuously along the sliding surface in the main body portion. The lamp member according to claim 3, further comprising a protrusion extending in a lower end direction, wherein the protrusion is fitted into the groove. 2. A hole is formed in the convex protrusion of the main body, a step is formed in the middle of the hole , and a sliding part is formed by fitting into the hole. 4. The lamp member according to any one of items 1 to 3. Lamp member according to any one of claims 1 to 5 resin material having high the sliding resistance is a resin material containing fluorine resin. The lamp member according to claim 6 , wherein the resin material containing a fluororesin is a blend of a fluororesin and a thermoplastic resin . The lamp member according to any one of claims 1 to 7 , wherein the resin material constituting the main body portion includes carbon fiber. The usage method of the lamp member which uses a combination of the lamp member of any one of Claim 1 thru | or 8 which has at least 1 sliding part.

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