JPH0261881A - Vibration isolator for disk drive system - Google Patents

Abstract

PURPOSE:To obtain a vibration isolating effect in spite of posture to be installed by constituting a device so as to set the spring constant of a vibration isolating member for the moving direction of a pickup less than that in a direction intersecting orthogonally to the moving direction of the pickup. CONSTITUTION:The vibration isolating member 32 is formed in almost elliptical ly cylindrical shape, and is mounted in such a way that grooves 32a and 32b formed along the outer peripheries of both end parts are fitted in through holes formed on a main chassis 25 and a cabinet 11, respectively. Also, the vibration isolating member 32 is formed so that the length in a direction of arrow head F can be set longer than the length in a direction of arrow head E and thickness t1 in the direction of arrow head F is set equal to the thickness t2 in the direc tion of arrow head E. And the member is mounted in a disk drive mechanism part 12 so that the spring constant for the moving direction of the pickup 4, i.e., directions of arrow heads A and B can be less than that for the direction intersecting orthogonally to the moving direction of the pickup, i.e., the direction of arrow heads C and D. In such a way, it is possible to obtain a stable vibra tion isolating effect in spite of the posture to be installed.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a disc drive system such as a compact disc player, and in particular, to a disc drive system including a pickup, etc., when external vibrations are applied. This invention relates to an improvement in a vibration isolating device that prevents vibration from being transmitted.

(Prior Art) As is well known, in the field of audio equipment, disk drive systems that read recorded information from a disk on which audio signals are digitized and recorded via an optical pickup have become widespread. Currently, for example, compact disc players are the mainstream.

FIG. 4 shows a schematic configuration of such a disk drive system. That is, the disk drive mechanism section 12 is housed in a substantially box-shaped cabinet 11 indicated by a two-dot chain line in the figure. A turntable 13 is rotatably supported approximately at the center of the disk drive mechanism section 12, and is rotatably driven by a disk motor (not shown).

Further, near the turntable 13, an optical pickup 14 is mounted by a guide shaft 15 as indicated by arrow A in the figure.

It is supported movably in the B direction. The pickup 14 is moved by the driving force of a linear motor (only the drive coil I6 is shown in FIG. 4), which will be described later. 18.

On the other hand, numeral 19 in the figure is a disk case, and a disk 20 is housed inside. This disk case 19 is
It is inserted into the cabinet 11 through an opening Ha formed in the front surface of the cabinet 11.

At this time, the disk case 19 is guided and inserted by the case guide member 21 of the disk drive mechanism section 12,
It is held in the final mounting position by a pressure spring 22. With the disc case 19 attached, the disc 20 is placed on the turntable 13, and the elongated hole 19a formed in the disc case 19 corresponds to the lens part 14a of the pickup 14, allowing playback. state.

Further, the disk case I9 is ejected by the disk case 19 being pushed out from the opening 11a by the ejection lever 24 driven by the driving force of the loading release motor 23.

Here, all the various parts constituting the disk drive mechanism section 12 described above are integrally mounted on the main chassis 25. The main chassis 25 includes four vibration isolating members 2G made of an elastic material such as rubber.
is supported in cabinet II by.

Here, the pickup 14 and the linear motor for moving the pickup 14 will be explained. That is, as shown in FIG.
is supported so as to be movable in the radial direction of the disk 20, that is, in the directions of arrows A and B in the figure, by inserting a guide shaft 15 into the oil-impregnated metal bearing 14b and the elongated hole 14c, respectively.

In addition, 27 in FIG. 5 is a near motor with a magnet 27a.

It is composed of a yoke 27b made of a magnetic material and the drive coil 16. Then, the magnet 27a and the yoke 27b
A magnetic circuit is formed by the drive coil t e +
, : By passing an electric current, a propulsive force is generated in this drive coil 16, and a driving force is obtained. This driving force is transmitted to the pickup 14 via the bobbin support plate 28 attached to the bobbin 27c around which the drive coil 16 is wound, and the pickup 14 is driven.

If the linear motor 27 is used to drive the pickup 14 as described above, the driving force of the linear motor 27 can be directly transmitted to the pickup 14, making it possible to transport the pickup 14 at high speed. It is possible to obtain excellent durability.

However, the linear motor 27 causes the pickup 14 to
Since the pickup 14 is not mechanically held in a predetermined position by the drive means for moving the pickup 14, the means for regulating the movement of the pickup 14 in the directions of arrows A and B in FIG. The driving force is only . Therefore, the driving means has strong vibration resistance against vibrations applied in the direction perpendicular to the moving direction of the pickup 14, that is, in the directions of arrows C and D in FIG. , that is, the direction along arrow A in the figure.

The problem is that it is very weak against vibrations applied in the B direction.

Therefore, conventionally, as described above, anti-vibration measures have been taken using the anti-vibration member 2B to prevent external vibrations from being transmitted to the disk drive mechanism section 12.

As shown in FIG.
9, and the other end is attached to the main chassis 25, and supports the disk drive mechanism section 12 floating inside the cabinet 11.

Note that 6 in FIG. 6 indicates the center of gravity of the disk drive mechanism section 12, and an arrow extending from this center of gravity G indicates the direction of gravity. Further, the cabinet 11 is placed on a base 31 via studs 30, as shown in FIG.

Here, the vibration isolating member 26 is shown in FIG. 7(a).

As shown in (b), the groove 26a is formed into a substantially cylindrical shape and is formed along the outer periphery of both ends thereof.

26b is fitted into through holes 25a and 29a formed in the main chassis 25 and the mounting portion 29, respectively.

However, in the conventional vibration isolating means as described above, the sixth
As shown in the figure, there is no problem if the disk drive mechanism section 12 is installed so as to be placed on the vibration isolating member 26, but as shown in FIG. As a result, the position of the disk drive mechanism, part L2, within the cabinet U shifts significantly, and the cabinet 11
The problem arises that the disk case 19 cannot be inserted or removed through the opening 11a, and the clearance for allowing vibration of the disk drive mechanism section 12 within the cabinet 11 becomes small, resulting in a significant deterioration of the vibration-proofing effect.

(Problem to be Solved by the Invention) As described above, the conventional vibration isolating device for a disk drive system has the problem that a sufficient vibration isolating effect cannot be obtained depending on the orientation in which the disk drive system is installed. are doing.

Therefore, this invention was made in consideration of the above circumstances, and provides an extremely good vibration isolating device for a disk drive system that can always obtain a stable vibration isolating effect regardless of the orientation in which the disk drive system is installed. The purpose is to provide.

[Structure of the Invention] (Means for Solving the Problems) That is, in the vibration isolating device for a disk drive system according to the present invention, the spring constant in the direction of movement of the pickup is greater than the spring constant in the direction perpendicular to the direction of movement of the pickup. It is equipped with a vibration isolating member configured to have a smaller size.

(Function) According to the above configuration, the vibration isolating member is configured such that the spring constant in the direction of movement of the pickup is smaller than the spring constant in the direction perpendicular to the direction of movement of the pickup. It is now possible to obtain approximately the same vibration isolation effect against vibrations applied in the direction of movement of the pickup and vibrations applied in a direction perpendicular to the direction of movement of the pickup, and the disk drive system is always stable regardless of the installed orientation. This makes it possible to obtain an anti-vibration effect.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings. Figure 1 (a), (b).

(C) shows a vibration isolating member 32 made of an elastic material such as rubber. The vibration isolating member 32 is formed into a substantially elliptical cylindrical shape, and grooves 32a and 32b formed along the outer periphery of both ends of the vibration isolating member 32 are connected to the main chassis 25.
and a through hole 25a formed in the attachment portion 29.

29a, respectively.

Further, the vibration isolating member 32 is formed so that the length in the direction of arrow F in FIG. 1(a) is longer than the length in the direction of arrow E in FIG. 1(a). Further, the vibration isolating member 32 is
The wall thickness 11 in the direction of the arrow E is formed so as to be equal to the wall thickness t2 in the direction of the arrow E.

Therefore, the vibration isolating member 32 easily bends in response to an external force applied in the direction of the arrow E, that is, has a small spring constant, and has a small spring constant.
It acts so that it does not easily bend in response to an external force applied in a direction, that is, its spring constant increases.

As shown in FIG. 2, the vibration isolating member 32 has a spring constant in the direction of movement of the pickup 14 (directions of arrows A and B) that is perpendicular to the direction of movement of the pickup 14 (directions of arrows C and D). installed within the disk drive system such that the spring constant is less than the spring constant for the disk drive system.

According to such a configuration, the vibration isolating member 32 is easily deflected against vibrations applied in the moving direction of the pickup 14, and can sufficiently exert a vibration insulating effect.

In addition, the vibration isolating member 32 becomes difficult to bend in response to vibrations applied in a direction perpendicular to the moving direction of the pickup 14.
Although the vibration insulating effect is slightly weakened, as mentioned above, it is inherently strong against vibrations in this direction, so vibration resistance is not impaired.

Therefore, the vibration applied in the moving direction of the pickup 14 and the pickup! It becomes possible to obtain substantially the same vibration damping effect against vibrations applied in a direction perpendicular to the direction of movement of No. 4.

Furthermore, if the cabinet 11 is installed vertically so that the directions of arrows C and D in FIG.
2, since it is applied in the direction where the mass or spring constant of the disk drive mechanism section 12 is large (the direction in which it is difficult to bend), it is possible to reduce the amount of relative positional deviation between the cabinet 11 and the disk drive mechanism section 12. Therefore, it is possible to prevent the disk case 19 from becoming impossible to take in and out, and from significantly deteriorating the vibration-proofing effect.

Next, FIGS. 3(a), (b), and (c) show other embodiments of the present invention. That is, the vibration isolating member 32 is made into a cylindrical shape, and the hollow portion 32c is defined by the arrow F in FIG. 3(a).
By forming a substantially elliptical shape wide in the direction, the wall thickness t4 in the arrow E direction is made thicker than the wall thickness t3 in the arrow F direction,
The structure is such that it is easily deflected in response to an external force applied in the direction of arrow E, that is, has a small spring constant, and is difficult to deflect in response to external force applied in the direction of arrow F, that is, has a large spring constant.

Here, the vibration isolating member is not limited to the above-mentioned shape, but can also be made of solid rubber, for example, by changing its density and material.
Of course, the spring constant may be configured to have directionality.

It should be noted that the present invention is not limited to the above-described embodiments, and can be implemented with various modifications without departing from the gist thereof.

[Effects of the Invention] As detailed above, according to the present invention, there is provided an extremely good vibration isolating device for a disk drive system that can always obtain a stable vibration isolating effect regardless of the installed orientation of the disk drive system. can be provided.

[Brief explanation of the drawing]

FIG. 1 shows an embodiment of the vibration isolating device for a disk drive system according to the present invention, and is a diagram showing the shape of the vibration isolating member, and FIG. 2 is a perspective view showing the state in which the vibration isolating member is installed. FIG. 3 is a diagram showing another embodiment of the invention, FIG. 4 is a perspective view schematically showing a disk drive system, and FIG. 5 is a perspective view illustrating a pickup near motor.
FIGS. 6 and 7 are sectional views showing conventional vibration isolating means, respectively, and FIG. 8 is a sectional view for explaining the problems of the conventional means. DESCRIPTION OF SYMBOLS 11... Cabinet, 12... Disk drive mechanism part, 13... Turntable, 14... Pick-up, 15... Guide shaft, 1B... Drive coil, 1
7...Detection coil, 18...Speed detector, 19...
・Disk case, 20...Disk, 21...Case guide member, 22...Pushing spring, 23...Loading release motor, 24...Ejection lever 25...Main chassis, 2B...Prevention Vibration member, 27... Linear motor, 28... Temporary bobbin support, 29... Mounting part, 3
0...Stud, 3■...Base, 32...Vibration isolating member. (a) Applicant's agent Patent attorney Takehiko Suzue Figure 1 (a) Figure Figure (a) (b) Figure

Claims (1)

[Claims] A disk drive mechanism unit, which includes a rotation drive unit that rotates a disk and a pickup that is moved in the radial direction of the disk rotated by the rotation drive unit and reads recorded information from the disk, is attached to a mounting base via a vibration isolating member. In the vibration isolating device for a disk drive system installed in a disk drive system, the vibration isolating member is configured such that a spring constant in a direction of movement of the pickup is smaller than a spring constant in a direction perpendicular to the direction of movement of the pickup. A vibration isolator for disk drive systems featuring: