JP2006269025A - Disk drive device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To more efficiently suppress the vibration of a main frame by a sub-frame. <P>SOLUTION: In a disk drive device of the present invention, when an interval between a case 11 and a main frame 14 is elastically supported with first elastic members 13, and also an interval between the main frame 14 and a sub-frame 19 is supported with second elastic members 21 in the state that a spindle motor 16 which drives the rotation of an optical disk D and an optical pickup 18 which is freely movable in the radial direction of the optical disk D are mounted on the main frame 14, and vibration which is generated in the main frame 14 by the eccentricity of center of gravity of the disk D is absorbed by the sub-frame 19, the position Gs of the centroid of the sub-frame 19 is made to roughly coincide with the position Gm of gravity of the whole body on the main frame 14. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a disk drive device configured to suppress vibration caused by rotation of a spindle motor that rotationally drives a disk when an information signal is recorded and / or reproduced on a disk such as an optical disk, a magneto-optical disk, or a magnetic disk. It is about.

Generally, a disk such as an optical disk, a magneto-optical disk, or a magnetic disk can record and / or reproduce music information, video information, or other data in a large capacity and can access desired information at high speed. A disk drive device configured to suppress vibration caused by rotation of a spindle motor that rotationally drives the disk when recording and / or reproducing information signals on the disk is widely used (for example, disclosed) , See Patent Document 1).
JP 2004-6014 A (page 4-5, FIGS. 1 to 3).

5 (a) and 5 (b) are a top view, a longitudinal sectional view and a conventional disk drive device,
FIG. 6 is a diagram for explaining a vibration model in a conventional disk drive device.

  As shown in FIGS. 5A and 5B, the conventional disk drive device 100 is disclosed in the above-mentioned Patent Document 1 (Japanese Patent Laid-Open No. 2004-6014). A brief description will be given with reference to FIG.

  As shown in FIGS. 5 (a) and 5 (b), in the conventional disk drive device 100, the first elastic member in which the main frame 102 is formed on the bottom plate 101a in the housing 101 using a rubber material or a resin material. 103 is elastically supported at least at three locations along the outer periphery.

  In this main frame 102, a turntable 104 for mounting the optical disk D is fixed to the motor shaft to rotate the optical disk D, and a radius of the optical disk D is guided by a pair of guide rails 106, 106. An optical pickup 107 that is movable in the direction is attached.

  Further, a sub frame 108 that functions as a vibration absorber for the main frame 102 is disposed above the main frame 102 and below the disk mounting surface 104a of the turntable 104. The sub frame 108 is The main frame 102 is elastically supported at least at three locations along the outer periphery by a second elastic member 109 formed using a rubber material or a resin material. In this case, the center of gravity of the sub frame 108 is set on the rotation axis of the spindle motor 105 by arranging the sub frame 108 on the main frame 102 to the right of the spindle motor 105.

  As a result, the main frame 102 maintains a structure that is not easily affected by external vibrations due to the action of the first elastic member 103. Further, when the spindle motor 105 is rotated, the main frame 102 is unbalanced by the optical disk D. The vibration generated in the frame 102 is suppressed by the vibration absorbing action of the subframe 108 and the second elastic member 109, so that the recording and / or reproduction of the optical disc D can be performed satisfactorily.

  Here, FIG. 6 shows a vibration model in the conventional disk drive device 100. In this vibration model, the optical disk D having the eccentric center of gravity is placed on the turntable 104 as described above with reference to FIG. When the main frame 102 vibrates due to the eccentric gravity center of the optical disk D when it is mounted and rotated at a high speed by the spindle motor 105, the subframe 108 elastically supported on the main frame 102 by the second elastic member 109 is the main frame. Since it vibrates in an opposite phase with respect to 102, vibration of the main frame 102 can be effectively suppressed. Further, it is disclosed that since the housing 101 and the main frame 102 are elastically supported by the first elastic member 103, a sufficient damping effect can be obtained even with respect to external vibration. Yes.

  By the way, according to the conventional disk drive device 100 described above, the first elastic member 103 elastically supports the space between the housing 101 and the main frame 102, and the main frame 102 and the sub frame 108 are connected to each other. By elastically supporting the gap with the second elastic member 109, the subframe 108 can act as a vibration absorber for the vibration of the main frame 102. However, the following items (1) and (2) The problem described in the section has arisen.

  (1) Although it is disclosed that the vibration generated by the eccentric center of gravity of the optical disk D can be effectively suppressed by setting the center of gravity of the sub-frame 108 on the rotation axis of the spindle motor 105, the sub-frame 108 has a spindle Since the motor 105 is arranged to the right and the rotation axis of the spindle motor 105 is different from the position of the center of gravity on the main frame 102, vibration suppression by the subframe 108 is suppressed. Not perfect.

  (2) As described above, the sub frame 108 is disposed above the main frame 102 and below the disk mounting surface 104a of the turntable 104. At this time, as shown in FIG. As described above, the height from the main frame 102 to the optical disc D is set to H1, the height from the main frame 102 to the subframe 108 is set to H2, and the surface direction of the optical disc D is determined by the eccentric center of gravity of the optical disc D. Assuming that the force generated in F1 is F1 and the force necessary to cancel this force in the subframe 108 is F2, the following relationship (Formula 1) holds.

[Equation 1]
F2 / F1 = H1 / H2 (1 formula)

  Therefore, according to (Expression 1) described above, when H2 is smaller than H1, F2 has a large value. Considering the case where the vibration with respect to the force F2 is suppressed by the subframe 108, there is a problem because the vibration cannot be suppressed unless the mass of the subframe 108 is increased with respect to the large force F2.

  Therefore, external vibration is absorbed by the first elastic member between the housing and the main frame, and vibration of the main frame is absorbed by the sub frame between the main frame and the sub frame by the second elastic member. At the same time, there is a demand for a disk drive device that can more effectively suppress the vibration of the main frame by the subframe.

This invention is made | formed in view of the said subject, The invention of Claim 1 is a housing | casing,
A spindle motor that is provided in the housing and that is driven to rotate by fixing a turntable for mounting a disk to a motor shaft, and an optical pickup and / or a magnetic head that are movable in the radial direction of the disk are attached. The mainframe,
A first elastic member that elastically supports at least three places between the housing and the main frame;
A sub-frame disposed on the main frame to absorb vibration generated in the main frame;
In a disk drive device comprising a second elastic member that elastically supports at least three positions between the main frame and the sub frame,
The disk drive device according to claim 1, wherein a position of the center of gravity of the sub-frame is substantially matched to a position of the center of gravity on the main frame.

Moreover, 2nd invention is a housing | casing,
A spindle motor that is provided in the housing and that is driven to rotate by fixing a turntable for mounting a disk to a motor shaft, and an optical pickup and / or a magnetic head that are movable in the radial direction of the disk are attached. The mainframe,
A first elastic member that elastically supports at least three places between the housing and the main frame;
A sub-frame disposed on the main frame to absorb vibration generated in the main frame;
In a disk drive device comprising a second elastic member that elastically supports at least three positions between the main frame and the sub frame,
In the disk drive device, the sub-frame is disposed above the disk placed on the turntable.

  According to the disk drive device of the first aspect, the first between the housing and the main frame is mounted with the spindle motor for rotating the optical disk and the optical pickup movable in the radial direction of the optical disk mounted on the main frame. And elastically supported by the second elastic member between the main frame and the sub frame, and the sub frame absorbs vibrations generated in the main frame due to the eccentric center of gravity of the optical disk. In this case, since the center of gravity position of the subframe is substantially matched with the overall center of gravity position on the main frame, vibration generated in the main frame can be more effectively suppressed by the subframe than in the conventional example. .

  According to the disk drive device of the second aspect, the spindle motor for rotating the optical disk and the optical pickup movable in the radial direction of the optical disk are mounted on the main frame, and the space between the casing and the main frame is attached. Elastically supported by the first elastic member, and elastically supported by the second elastic member between the main frame and the subframe, and vibration generated in the mainframe due to the eccentric center of gravity of the optical disk Since the sub-frame is disposed above the disk placed on the turntable when absorbing the disk, the sub-frame having a lighter mass than the conventional example can effectively suppress vibration, and the disk drive device It is possible to reduce the weight.

  Hereinafter, an embodiment of a disk drive apparatus according to the present invention will be described in detail in the order of Embodiment 1 and Embodiment 2 with reference to FIGS.

1A and 1B are a top view, a longitudinal sectional view, and a sectional view showing a disk drive device according to a first embodiment of the invention.
2A is a longitudinal sectional view showing the first and second elastic members shown in FIG. 1 in an enlarged manner, and FIG. 2B is a diagram showing a first embodiment of the disk drive device according to the present invention. 1, a longitudinal sectional view showing an enlarged support state of the second elastic member,
FIG. 3 is a diagram for explaining a vibration model in the disk drive device according to the first embodiment of the present invention.

  As shown in FIGS. 1A and 1B, in the disk drive device 10A according to the first embodiment of the present invention, the housing 11 is formed in a box shape.

  In this case 11, left elastic member support pieces 11b1 and 11b1 are formed so as to protrude from the inside of the left side plate 11b suspended from the left end of the bottom plate 11a to the right in parallel with the bottom plate 11a at a distance from the front and rear. In addition, the right elastic member support pieces 11a1 and 11a1 are bent to the left after the right elastic member support pieces 11a1 and 11a1 are directed upward to the right on the bottom plate 11a, and are spaced at the same height as the left elastic member support pieces 11b1 and 11b1. Protrusions are formed.

  In addition, a total of four shafts 12 are respectively implanted in the left elastic member support pieces 11b1, 11b1 and the right elastic member support pieces 11a1, 11a1 formed at intervals in the front, rear, left, and right inside the housing 11. A total of four first elastic members 13 are attached to each shaft 12. And the intermediate part in the 1st elastic member 13 is engage | inserted in each hole formed in the four corners of the main frame 14 formed in the substantially rectangular shape. As a result, the main frame 14 is elastically supported by the four first elastic members 13 in substantially parallel to the bottom plate 11 a of the housing 11.

  On the upper surface 14a of the main frame 14, the turntable 15 for mounting the optical disk D is fixed to the motor shaft, and is guided by a spindle motor 16 that rotates the optical disk D and a pair of guide rails 17 and 17. An optical pickup 18 that is movable in the radial direction of the optical disk D is attached. At this time, the overall center-of-gravity position Gm on the main frame 14 is calculated from the weight of the optical pickup 18 and the weight of the spindle motor 16 at a position almost reaching the middle position of the moving range, and is larger than that of the spindle motor 16. It is set near the outer periphery of the turntable 15 on the left side.

  Further, an escape hole 14b is formed in the main frame 14 so as to face the optical pickup 18 disposed on the lower surface side of the optical disc D. The optical pickup 18 extends along the front and rear of the escape hole 14b. A pair of guide rails 17, 17 for guiding the right and left are provided in parallel.

  When a magneto-optical disk (not shown) is mounted on the turntable 15 instead of the optical disk D, the optical pickup 18 and the magnetic head (not shown) are provided so as to be movable in the radial direction of the magneto-optical disk. Just do it. When a magnetic disk (not shown) is mounted on the turntable 15 instead of the optical disk D, a magnetic head (not shown) is provided to be movable in the radial direction of the magnetic disk instead of the optical pickup 18. Just do it.

  Further, a sub frame 19 that functions as a vibration absorber with respect to the main frame 14 is disposed substantially parallel to the main frame 14 above the main frame 14. The sub-frame 19 is slightly smaller in outer size than the main frame 14 and is formed in a substantially rectangular shape, and a clearance hole 19a for allowing the spindle motor 16 and the optical pickup 18 to face is opened inside.

  In addition, a total of four second elastic members 21 are attached to a total of four shafts 20 that are planted on the main frame 14 at intervals in the front, rear, left, and right directions. And the intermediate part in the 2nd elastic member 21 is engage | inserted in each hole formed in the four corners of the sub-frame 19 formed in the substantially rectangular shape. Thereby, the sub-frame 19 is elastically supported by the four second elastic members 21 in substantially parallel to the main frame 14.

  At this time, in the first embodiment, the sub frame 19 is disposed above the main frame 14 and below the disk placement surface 15a of the turntable 15, and the center of gravity position Gs of the sub frame 19 is set to the main frame. 14, which are approximately coincident with the entire center of gravity position Gm on 14, and symmetrical with respect to the center of gravity position Gs of the sub-frame 19 in the front and rear, left and right dimension positions (L 1, L 1), (L 2, L 2). Two elastic members 21 are provided.

  Here, as shown in an enlarged view in FIG. 2 (a), the first and second elastic members 13, 21 described above are formed in a substantially cylindrical shape using a rubber material or a resin material having a damping characteristic against vibration. The first flange portion is formed integrally with the center hole 13a, 21a through the inner center portion of the substantially cylindrical shape, and is formed in order from the lower side to the upper side of the outer periphery of the substantially cylindrical shape. 13b, 21b, annular groove portions 13c, 21c, and second flange portions 13d, 21d are formed. At this time, the first and second elastic members 13 and 21 may be appropriately set in material and dimensions of each part according to the vibration design of the main frame 14 and the sub frame 19.

  Then, for example, only the left side in the housing 11 will be described with reference to FIG. 2B. The left elastic member support piece 11b1 formed to protrude inside the left side plate 11b of the housing 11 is connected to the first via the shaft 12. The elastic member 13 is attached, and the annular groove 13c of the first elastic member 13 is fitted into a hole formed in the left corner of the main frame 14, and the shaft is screwed from the top of the first elastic member 13 through the washer 22 with the screw 23. 12, the main frame 14 is elastically supported with respect to the casing 11. Similarly, the second elastic member 21 is attached to the main frame 14 via the shaft 20, and the subframe 19 An annular groove 21c of the second elastic member 21 is fitted into a hole formed in the left corner, and the shaft 20 is attached to the shaft 20 from the upper portion of the second elastic member 21 through a washer 22 with a screw 23. By constant, sub-frame 19 is elastically supported relative to the main frame 14.

  As shown in FIG. 3, in the vibration model in the disk drive device 10 </ b> A according to the first embodiment of the present invention configured as described above, the first elastic member 13 is elastic between the housing 11 and the main frame 14. When the optical disk D is supported and the main frame 14 and the sub frame 19 are elastically supported by the second elastic member 21, the optical disk D having a eccentric gravity center as described above with reference to FIG. When the main frame 14 is vibrated by the eccentric center of gravity of the optical disk D when mounted on the turntable 15 and rotated at high speed by the spindle motor 16, the main frame 14 is elastically supported by the second elastic member 21. Since the sub-frame 19 vibrates in an opposite phase with respect to the main frame 14, the vibration of the main frame 14 can be effectively damped. Can. At this time, since the center of gravity position Gs of the sub frame 19 is substantially matched with the entire center of gravity position Gm on the main frame 14, vibration generated in the main frame 14 is more effectively caused by the sub frame 19 than in the conventional example. Can be suppressed.

  4 (a) and 4 (b) are a front view and a side view showing a disk drive device according to a second embodiment of the present invention.

  The disk drive device 10B according to the second embodiment of the present invention shown in FIGS. 4A and 4B is the same as the disk drive device 10A according to the first embodiment described above with reference to FIG. Here, for convenience of explanation, the components shown above are indicated by the same reference numerals, and different portions are indicated by new reference numerals, with different points as the center. I will explain.

  As shown in FIGS. 4A and 4B, in the disk drive device 10B according to the second embodiment of the present invention, the main frame 14 to which the spindle motor 16 and the optical pickup 18 are attached is formed by the first elastic member 13. A sub-frame 19 that is elastically supported in the housing 11 and functions as a vibration absorber to suppress vibration generated in the main frame 14 is elastically supported on the main frame 14 by the second elastic member 21. Although this is the same as in the first embodiment, the subframe 19 is significantly different from the first embodiment in that the subframe 19 is disposed above the optical disk D placed on the turntable 15.

  Accordingly, the disk drive device 10B according to the second embodiment of the present invention is configured as a front loading type, and as illustrated in FIG. A pair of U-shaped guide rails 31 and 31 for guiding a disc loading case (not shown) are provided opposite to each other and spaced apart from each other.

  Further, on the main frame 14, a total of four stepped shafts 32 having a height higher than that of the shaft 21 instead of the shaft 21 used in the first embodiment are spaced apart in the front-rear and left-right directions. These stepped shafts 32 are integrally formed of a lower large diameter portion 32a and an upper small diameter portion 32b.

  The second elastic members 21 are attached to the small diameter portions 32b of the stepped shafts 32, respectively. And the intermediate part in the 2nd elastic member 21 is engage | inserted in each hole formed in the four corners of the sub-frame 19 formed in the substantially rectangular shape. As a result, the subframe 19 is elastically supported substantially parallel to the main frame 14 above the optical disk D by the four second elastic members 21, so that the height from the main frame 14 to the subframe 19 is high. The height H3 can be set higher than the height H2 of the conventional example described above with reference to FIG.

  That is, FIG. 4B shows the relationship between the force applied to the optical disc D and the subframe 19. The height from the main frame 14 to the optical disc D is set to H1, the height from the main frame 14 to the subframe 19 is set to H3, and the force generated in the surface direction of the optical disc D by the eccentric center of gravity of the optical disc D is set. Assuming that F1 is F1 and the force necessary to cancel this force in the subframe 19 is F3, the following relationship (Formula 2) is established.

[Equation 2]
F3 / F1 = H1 / H3 (2 formulas)

  Therefore, according to the above (Formula 2), when H3 is larger than H1, F3 becomes a small value. Considering the case where the vibration with respect to the force F3 is suppressed by the subframe 19, since the force of F3 is small, the mass of the subframe 19 can be reduced. Thus, in the second embodiment, the vibration can be effectively suppressed by the lighter subframe 19 than in the conventional example, and the disk drive device 10B of the second embodiment can be reduced in weight.

(A), (b) is the top view and longitudinal cross-sectional view which showed the disk drive apparatus of Example 1 which concerns on this invention. In the disk drive device according to the first embodiment of the present invention, (a) is an enlarged longitudinal sectional view showing the first and second elastic members shown in FIG. 1, and (b) is the first and first elastic members. It is the longitudinal cross-sectional view which expanded and showed the support state of 2 elastic members. In the disk drive device of Example 1 which concerns on this invention, it is a figure for demonstrating a vibration model. (A), (b) is the front view and side view which showed the disk drive apparatus of Example 2 which concerns on this invention. (A), (b) is the top view and longitudinal cross-sectional view which showed the conventional disc drive device. It is a figure for demonstrating a vibration model in the conventional disc drive device.

Explanation of symbols

10A: the disk drive device of Example 1,
10B: The disk drive device of Example 2,
DESCRIPTION OF SYMBOLS 11 ... Housing | casing, 11a ... Bottom plate, 11a1-11a4 ... Right side elastic member support piece,
11b ... left side plate, 11b1-11b4 ... left side elastic member support piece,
14 ... main frame, 14a ... upper surface, 14b ... escape hole,
12 ... shaft,
13 ... 1st elastic member, 13a ... Center hole, 13b ... 1st flange part,
13c ... annular groove, 13d ... second flange,
15 ... Turntable, 15a ... Disc mounting surface,
16 ... Spindle motor, 17, 17 ... A pair of guide rails,
18 ... Optical pickup,
19 ... subframe, 19a ... escape hole,
DESCRIPTION OF SYMBOLS 20 ... Shaft 21 ... 2nd elastic member, 21a ... Center hole, 21b ... 1st flange part,
21c ... annular groove, 21d ... second flange,
22 ... Washer, 23 ... Screw,
31, 31 ... U-shaped guide rail, 32 ... Stepped shaft,
Gm: the center of gravity position of the main frame 14, Gs: the center of gravity position of the subframe 19,
D: Optical disc.

Claims (2)

A housing,
A spindle motor that is provided in the housing and that is driven to rotate by fixing a turntable for mounting a disk to a motor shaft, and an optical pickup and / or a magnetic head that are movable in the radial direction of the disk are attached. The mainframe,
A first elastic member that elastically supports at least three places between the housing and the main frame;
A sub-frame disposed on the main frame to absorb vibration generated in the main frame;
In a disk drive device comprising a second elastic member that elastically supports at least three positions between the main frame and the sub frame,
2. A disk drive device according to claim 1, wherein the position of the center of gravity of the sub-frame is substantially coincident with the position of the center of gravity on the main frame. A housing,
A spindle motor that is provided in the housing and that is driven to rotate by fixing a turntable for mounting a disk to a motor shaft, and an optical pickup and / or a magnetic head that are movable in the radial direction of the disk are attached. The mainframe,
A first elastic member that elastically supports at least three places between the housing and the main frame;
A sub-frame disposed on the main frame to absorb vibration generated in the main frame;
In a disk drive device comprising a second elastic member that elastically supports at least three positions between the main frame and the sub frame,
A disk drive device, wherein the subframe is disposed above the disk placed on the turntable.

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