JP2003141863A - Disk drive unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To widen the gap of the portion of a top plate corresponding to the turntable without reducing the strength of the top plate. SOLUTION: The portion of the top plate 18 corresponding to the upper part of the turntable 13 of a tray 3 at a load position is formed thinner than the raw material of the top plate around the portion by a squeeze working with a press, and a recessed part 19 is formed by differences of wall thickness. In the squeeze working, holes 22 for absorbing a deformed portion can be provided in a press region, and holes 20 for blocking propagation of stress can be provided in the outer peripheral side peripheral edges of the holes 22.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention mounts and drives an information recording disk such as a compact disk (CD) or a digital video disk (DVD) to read out information.
The present invention relates to a disk drive device for writing.

[0002]

2. Description of the Related Art Some disk drive devices, such as notebook computers, are built into a master device in which a number of mechanisms are arranged in high density. This type of disk drive
Unless the mechanism of the parent device is configured with a high density and the density of the parent device is equal or higher, the significance of the mechanism of the parent device having a high density is reduced by half. For this reason, the tray is slidably moved in and out of the tray storage unit composed of the main body chassis and the cover, and the disk drive mechanism, the head, and the head drive mechanism are attached to the tray side so that these vertical dimensions can be as much as possible. It is compact and does not create an extra space between the main chassis and the cover attached to it. As a result, the gap between the tray that is moved to the load position and stored in the main body chassis and the top plate of the cover is extremely limited.

On the other hand, a turntable which is driven and rotated by a disc drive motor is attached to the tray side, and a chuck for attaching and engaging an information recording disc (hereinafter referred to as a disc) is projected in the central portion thereof. The top surface of the chuck has almost the same height as the top surface of the tray, and for the above reason, the gap between the top surface of the cover and the inner surface of the top plate is extremely small. For this reason, even if the top plate of the cover is slightly deformed due to temperature or impact, it may come into contact with the chuck of the tray at the loading position and induce uneven rotation of the disc or a read or write error. Furthermore, since the gap between the disc attached to the turntable and the top plate is also small, the recording surface of the disc may come into contact with the main body chassis when the disc drive device is tilted or subjected to relatively large vibration.

To solve this, Japanese Patent No. 286179
In the invention of No. 3, an opening is provided in the top plate above the turntable at the load position, and the opening is covered with a lid thinner than the plate thickness of the top plate. However, in this structure, since a large opening is opened in the top plate, the strength of the top plate is impaired, and it is necessary to prepare a member called a lid separately from the top plate. In addition,
There is no description in this publication that the recording surface of the disk is prevented from coming into contact with the chassis of the main body by the structure of the top plate above the turntable.

[0005]

DISCLOSURE OF THE INVENTION According to the present invention, the disk storage portion composed of the main body chassis and the cover can be made thinner, and the top plate of the cover is less likely to interfere with the turntable in the load position. An object of the present invention is to provide a disk drive device which can prevent the disk mounted on the turntable from tilting and prevent the recording surface of the disk from coming into contact with the main body chassis.

[0006]

In a disk drive device having a turntable for holding and rotating a disk, and a top plate for protecting the upper part of the disk, a portion of the top plate corresponding to the turntable from the inner surface The viewed recess is formed integrally with the material forming the top plate. To form such a recess, it is preferable to use plastic deformation due to the crushing process in the press process using the material of the top plate as a metal.

In the crushing process, a deformation absorbing hole for absorbing the flow of the material due to plastic deformation and a propagation blocking hole for blocking the propagation of stress to the periphery of the recess are formed. This prevents unexpected deformation of the top plate around the recess. The deformation absorption holes are often fan-shaped holes arranged radially from one center point, and the propagation blocking holes are often arranged annularly around the periphery of the recess. According to the crushing process, the surface of the top plate facing the turntable is the inner surface, and the surface on the back side of this inner surface is the outer surface, and the inner surface of the top plate faces the turntable. The recess is formed of a material integral with the plate. At the location of this recess, the top plate is thinner than the wall thickness of the top plate of the other part, so that the recess is formed. It should be noted that by selecting a press die, the recess may have a thinner wall thickness than other portions, and at the same time, may have a deeper structure in which the outer surface of the recess is projected more than other portions of the top plate. it can.

On the other hand, a convex portion may be provided so as to project inward from the inner surface of the top plate. The convex portion is often arranged around the concave portion. The overall shape of the convex part is a ridge with a certain length such as a rounded small conical shape or an arc shape, and the height is the distance from the inner surface to the disk surface to be mounted on the turntable. Slightly smaller than The arrangement of the convex portion on the top plate is usually a portion corresponding to the upper side of the turntable and is often the peripheral edge of the chuck.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1, a disk drive device 1 comprises a main body chassis 2, a tray 3 and a cover 4, and a main body chassis 2 and a cover 4 covering the main body chassis 2 form a disk 5
Constitutes a storage part of. The whole is built into a laptop. The body chassis 2 is a press-formed product of steel plate,
A main circuit board 6 is provided. The main circuit board 6 is provided with a connector 7 for connecting to the parent device, and a flexible flat cable (FFC) for connecting to the tray side.
8 are connected.

The tray 3 has a sled chassis 10 mounted on a tray base 9. The tray base 9 is an injection-molded product of synthetic resin, and has a tray mounting portion 11 having a circular recess on the upper surface of the central portion. The sled chassis 10 is a press-formed product of a steel plate and includes a head 12 and a turntable 13. The head 12 is reciprocated in the radial direction of the disk mounted by the head drive motor. Turntable 1
3 is driven and rotated by a disk drive motor, and a chuck 14 is formed with a step at the center and has an engaging claw 15. The main circuit board 6 is a circuit for processing a command from the master device to control the operation of the head drive motor or the disk drive motor, a process of fetching data from the master device to the disk side, or reading from the disk. A circuit for sending data to the parent device is provided. The other end of the FFC 8 is connected to a sub-circuit board provided in the tray 3, and the movement / stop of the head 12 and the rotation of the turntable 13 are controlled through this.

Between the left and right sides of the tray 3 and the left and right side walls 16a, 16b of the main body chassis 2, rails 17 by linear guides are arranged.
It is possible to slide back and forth. The position where the disc 5 can be operated by pushing the tray 3 into the main body chassis 2 is the load position (the cover 4 is removed in FIG. 2), the tray 3 is fully pulled out from the main body chassis 2, and the disc 5 is detached. The position is the unload position (Fig. 1).

The cover 4 is a press-formed product made of a steel plate having a thickness of 0.4 mm, and has side walls on both sides, a rear wall and the top plate 1.
8 and is assembled to the main body chassis 2 so as to cover the upper part of the main body chassis 2, and the inner space of these serves as a tray storage portion. At the center of the top plate 18, a circular concave portion 19 and a plurality of circular arc-shaped through holes 20 and convex portions 21 arranged in an annular shape around the circular concave portion 19 are formed (FIG. 3). The recess 19 (FIGS. 3 and 4) is circular, and has a plurality of fan-shaped holes 22 that radiate from the center of the circle.
It has a (through hole).

The press molding of the cover 4 is performed by a progressive die, and punching, forming a side wall, and a concave portion 19 and a convex portion 21.
The formation of the concave portion 19 is carried out for each portion while being sequentially sent to a large number of molds, and the concave portion 19 is formed by forming a portion corresponding to the turntable 13 when the tray 3 is at the loading position and a peripheral region thereof. First, the arc-shaped through hole 20 and the fan-shaped hole 22 are punched out and then crushed and formed. The crushing molding itself is also performed in a plurality of steps so that the enlarged cross section of FIG. 5 has a stepwise shape. As a result, the fan-shaped hole 22 is included and the arc-shaped through hole 20 on the outer side thereof is included. A circular region in a non-burdening area is flattened and processed to reduce the thickness of the material by half to 0.2 mm.

Thus, the turntable 1 of the top plate 18
3 is an inner surface, and a surface on the back side of the inner surface is an outer surface, a material integrated with the top plate 18 is formed on a portion of the inner surface of the top plate 18 facing the turntable 13. Thus, the recess 19 is formed, and the wall thickness from the inner surface to the outer surface in the recess 19 is smaller than the wall thickness from the inner surface to the outer surface of the top plate 18 at portions other than the recess 19. In this process, the spokes 23 between the fan-shaped holes 22
The area subjected to the pressing action is crushed to have a wider width with the center of as a center, and the deformation thereof protrudes toward the inside of the fan-shaped hole 22. That is, the fan-shaped hole 22 is a deformation absorption hole that absorbs the deformation of the material due to the crushing process, and the existence of the hole 22 allows the crushing to be performed without difficulty and the dimensional accuracy of the machining process to be high. It can be performed.

On the other hand, during the crushing process, the outer edge of the recess 19 has a stepped portion due to the thickness of the inside of the recess 19 being halved. Irregular stress is generated in the outer top plate portion close to, but since the arc-shaped through hole 20 is formed outside the concave portion 19, the influence of these stresses is widely propagated to the whole top plate 18. Can be prevented. That is,
The arc-shaped through hole 20 is a hole that prevents deformation from propagating. This improves the dimensional accuracy of the entire cover 4, especially the flatness of the top plate 18. The concave portion 19 is a concave portion when viewed from the inner surface side of the top plate 18, and the crushing process is characterized in that the concave portion 19 is formed of a material integrated with other portions of the top plate 18. is there. Further, it is possible to perform a crushing process in which the outer surface side of the recess 19 is made to slightly protrude from the outer surface of the other portion of the top plate 18 to make the recess 19 deeper by selecting a die.

In this embodiment, there are three convex portions 21,
The arc-shaped through-holes 20 are arranged at 120 ° intervals outside the arc-shaped through-holes 20, and the processing is carried out at an appropriate time by incorporating them in the pressing process of the progressive feed molding described above. Each of the convex portions 21 is extruded into a small conical shape from the outer surface side to the inner surface side of the top plate 18. The height is about 0.5 mm from the inner surface. The outside of the arc-shaped through hole 20 in which the convex portion 21 is provided is a portion corresponding to the portion in the center of the disk 5 where the annular recording surface is not formed.

By the above processing, the top plate 18 of the cover 4
A circular recess 19 is formed at a location corresponding to the turntable 13 of the tray 3. As a result, a space can be provided between the turntable 13 of the tray 3 in the loading position, specifically, between the top surface of the chuck 14 and the inner surface of the top plate 18, even though it is strictly limited. This allows
It is possible to prevent uneven rotation of the turntable 13 and occurrence of an error. Further, the vertical dimension of the disc storage portion can be further reduced if necessary.

Since the concave portion 19 is formed of a material integral with the top plate 18, a structural disadvantage of the entire cover 4 due to cutting out a large opening, for example,
There are no problems such as structural weakening and easy deformation. Further, it can be incorporated into a series of processes such as a progressive press process, and is easy to process. Further, since the convex portion 21 is arranged on the outer peripheral edge of the concave portion 19, the chuck 14
Even if the disc mounted on the disc tilts for some reason, the surface of the disc 5 comes into contact with any of the three convex portions 21 to prevent further tilting, and the disc is opposed via the center of the disc. It is possible to prevent the inconvenience that the side disk recording surface comes into contact with the main body chassis 2. Although the embodiment has been described above, the shape and number of the deformation absorption holes (fan-shaped holes 22) and the propagation blocking holes (arc-shaped through holes 21) are not limited to those illustrated.

[0019]

EFFECTS OF THE INVENTION Since the recess for escaping the inner surface of the top plate above the turntable is formed of a material which is integral with the other parts of the top plate, the strength of the top plate can be increased. In particular, since only a part of the top plate corresponding to the turntable is thinned, the disk drive device can be thinned while the strength of the top plate is hardly impaired. During the crushing process to make only a part thinner, the deformation absorption holes and the propagation prevention holes are formed, so the stress during processing does not remain in the recess and the stress generated during processing does not propagate to the periphery of the recess. Therefore, a top plate with high dimensional accuracy can be obtained.

In the structure in which only a part of the top plate corresponding to the turntable is thinned, it is not necessary to separately form a lid and the like, and the labor of parts management and assembly is small. It is possible to eliminate the possibility that the top surface of the turntable comes into contact with the inner surface of the top plate and causes uneven rotation or an error. Since the convex portion is provided on the peripheral edge of the concave portion, even if the mounted disc is inclined, the recording surface of the disc is not inclined so as to come into contact with the main body chassis.

[Brief description of drawings]

FIG. 1 is a perspective view schematically showing the whole (unloaded position)

FIG. 2 is a plan view showing a cover removed (loading position)

FIG. 3 is a perspective view of a cover.

FIG. 4 is an enlarged perspective view of a main part (partially cut).

FIG. 5 is a cross-sectional view of the main part

[Explanation of symbols]

1 Disk drive 2 body chassis 3 trays 4 cover 5 Information recording disc 6 main circuit board 7 connector 8 FFC 9 tray base 10 thread chassis 11 Tray mounting part 12 heads 13 turntable 14 chuck 15 Engaging claw 16 Left and right side walls 17 rails 18 Top plate 19 recess 20 Arc-shaped through hole 21 convex 22 fan-shaped hole 23 Spoke section

Claims (9)

[Claims] 1. A disk drive device having a turntable for holding and rotating a disk and a top plate for protecting an upper portion of the disk, wherein a surface of the top plate facing the turntable is an inner surface. When the surface on the back side of the inner surface is the outer surface, the inner surface of the top plate has a concave portion formed of a material integral with the top plate at a portion facing the turntable. Disk drive. 2. The wall thickness from the inner surface to the outer surface in the concave portion is formed thinner than the wall thickness from the inner surface to the outer surface in a portion other than the concave portion of the top plate. The disk drive device according to claim 1. 3. The disk drive according to claim 2, wherein the top plate is made of a metal material, and the wall thickness from the inner surface to the outer surface in the recess is plastically deformed to be thin. apparatus. 4. The disk drive device according to claim 3, wherein the plastic deformation is formed by press working. 5. The disk drive device according to claim 3, wherein an opening for absorbing a deformation amount due to the plastic deformation is provided in a portion where the wall thickness of the top plate is formed thin. 6. The disk drive according to claim 1, wherein an outer surface portion corresponding to an inner surface in the recess projects from another outer surface portion of the top plate. apparatus. 7. The disk drive device according to claim 1, wherein a plurality of arc-shaped openings are provided around the recess of the top plate. 8. The disk drive device according to claim 1, wherein a convex portion is provided around the concave portion on the inner surface. 9. The disk drive device according to claim 8, wherein the convex portion is formed outside the arc-shaped opening.