JP3015951B1 - Optical disk drive vibration damping device - Google Patents

Abstract

Abstract: [PROBLEMS] When vibration occurs in an optical disk drive body,
The vibration absorber can reduce the vibration in a specific frequency range, provide a simple and easy-to-install vibration absorber, and the best analysis results by the simplified power diagram You can select a vibration absorber with a coefficient,
An object of the present invention is to provide a vibration damping device for an optical disk drive that is easy to assemble and can obtain the best vibration damping effect. SOLUTION: A plurality of sets of vibration absorbers are attached to an optical disk drive main body of an optical disk drive, one set of vibration absorbers is an object having one mass and moment of inertia effect, and at least one elastic body having appropriate rigidity and damping coefficient. The optical disk drive can further improve the vibration absorbing effect by designing the vibration absorber.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates generally to a vibration damping device for an optical disk drive, and more particularly to a device capable of preventing the occurrence of vibration due to eccentric rotation of each component when the optical disk drive is operating at a high speed.

[0002]

2. Description of the Related Art The following is a description of this kind of conventional type.

A rotating body of a conventional optical disk drive mainly includes components such as a rotor 5 of a spindle motor, a disk 6 and a clamper 7 (see FIG. 1). Among them, the dynamic balance only of the rotor 5 of the spindle motor is the best, and the disk 6 and the clamper 7 are also balanced by errors in the manufacture of the respective parts and by eccentric rotation generated in the respective parts. And can not rotate. As described above, when the rotor 5 of the spindle motor rotates the disk 6 and the clamper 7 in conjunction with each other, the imbalance causes vibration of the optical disk drive body. The higher the rotation speed, the more the rotation occurs. The amount of vibration increases, and in the worst case, a pickup head
May be unable to read the material on the disc. Similarly, this problem also limits the double speed development in an optical disk drive that performs disk servo control using a fixed linear velocity (CLV) method, and therefore, the vibration of the optical disk drive main body in the double speed development is limited. It was a serious problem how to be suppressed.

On the other hand, Matsushita Electric Industrial Co., Ltd. of Japan
Since the development of the quadruple-speed optical disk drive, a steel ball has already been inserted into the clamper and used to reduce the amount of unbalance in the entire rotating body. In addition, there is also a design in which steel balls are put in the rotor of the spindle motor, and the design of the spindle motor having the function of automatically dynamic balancing is widely spread around the world, and many optical disk drive manufacturers, for example,
Widely adopted by NEC and TOHEI. In addition, manufacturers that do not adopt the above-described structure, such as TEAC and LITON, adopt an increase in the mass of the optical disk drive body, and
TSUMI, A-OPEN and the like reduce the amount of vibration of the optical disk drive body by adopting a two-layer damping rubber design.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to provide a vibration damping device for an optical disk drive which can achieve the following.

The main object of the present invention is to make it easier to assemble, to effectively solve the problem of vibration of the optical disk drive, and to effectively reduce the amount of vibration of the optical disk drive body. An object of the present invention is to provide a vibration damping device for an optical disk drive that can easily read data on a disk.

[0007]

Means for Solving the Problems To achieve the above object, an optical disk drive vibration damping device according to the present invention is configured as follows.

That is, the vibration damping device for an optical disk drive according to the present invention employs a design in which a vibration absorber having an appropriate rigidity and a damping coefficient is attached to the optical disk drive main body. The vibration absorber can reduce vibration in a specific frequency range.
Because the structure of the vibration absorber is simple and easy to install, and because the vibration damping structure is analyzed by a simplified force diagram, and based on the analysis results, select the vibration absorber that has the best coefficient. Therefore, the present invention has an advantage that it is easy to assemble and can obtain the best damping effect.

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 2 and 3 are a top view and a front view of a vibration absorbing device according to an embodiment of the present invention. The vibration absorbing device of the present invention has a structure similar to that of a conventional optical disk drive body 1 and a conventionally designed vibration damping elastic body 4. A set or multiple sets of vibration absorbers are added. One set of vibration absorbers is composed of one body 2 having a mass and moment of inertia effect, and one or several elastic bodies 3 having appropriate stiffness and damping coefficient. The elastic body 3 can be made of a spring or a damping rubber. By attaching the vibration absorber to the optical disk drive main body 1, vibration of the optical disk drive main body 1 can be absorbed by the action of the elastic body 3.

When the structure of the optical disk drive is a combination of the disk mounting structure and the optical disk drive main body 1, a vibration absorber can be attached to the combination, or the disk mounting structure or the optical disk drive main body can be attached. It can also be attached to parts.

In the diagram of the dynamic relation of each part of the present invention shown in FIG. 4, if this simple diagram and the theory are used to infer, the vibration absorption effect after the suction body is taken in can be calculated. The following is the inference part of the theory, where m1, m2, and m3 represent the masses of the optical disk drive body 1, the disk 6, and the vibration absorber 2, respectively, and x1, x2, and x3 are the optical disk drive body 1, the disk 6, and the vibration absorber, respectively. Represents the displacement of the body 2 (rightward displacement is defined as positive direction), k1 and c1,
k2 and c2, and k3 and c3 are the elastic constant and damping coefficient of the elastic component when passing through the optical disk drive main body 1, the disk 6, and the vibration absorber 2, respectively.

According to the analysis of Newtonian mechanics, the determinant of the differential equation of displacement diagonal frequency ω is:

(Equation 1) Here, p is a constant, and A, B, and C are the frequency response amplitudes of the diagonal frequency ω. After solving the above matrix equation,

(Equation 2) Where j is an imaginary number. Using inverse matrix arithmetic, the following equation is obtained.

(Equation 3) That is, x1 can be obtained.

(Equation 4) Among them,

(Equation 5)

As a result of inference using the above-mentioned theory, the parameters (m
3, k3, c3) and a specific vibration suppression frequency range can be selected. In a general state where the disk 6 and the optical disk drive main body 1 have no apparent relative movement, the following parameters are adopted. m1 = 132.5 grams, fn1 = 30 Hz, ξ1 =
0.3 where fn1 is the natural frequency of the optical disk drive itself,

(Equation 6) ξ1 is a damping ratio,

(Equation 7)

Fn3 is selected to be 100 Hz, vibration near 100 Hz is suppressed, and a different set of m3 and .SIGMA.3 is selected. As a result of the above inference, the vibration amount x1 is obtained within the frequency range f = 0 to 200 Hz. The relationship between frequency and frequency is drawn (as shown in FIGS. 5 and 6).

(Equation 8) Is adopted.

As can be seen from the figure, the heavier the mass of the vibration absorber m3, the more its vibration-absorbing effect becomes apparent, and the smaller the attenuation ratio ξ3, the more apparent the anti-resonance point. At this time, most of the external force is absorbed by the vibration absorber, and the effective range of vibration absorption is from 30 Hz to 100 Hz.
If it is up to Hz, the best vibration absorbing effect can be obtained.

According to the above-described theoretical inference, it is possible to select the vibration absorber having the best parameters, and to set the embodiment of the present invention. When the rotor 5 and the disk 6 of the spindle motor rotate, the displacement of the optical disk drive main body 1 is changed. The effect of the vibration damper was proved by measuring the quantity (x1). The results of the vibration damping experiment are shown in FIG. 7 and Table 1. As shown in FIG. The vibration rubber was selected. Compared to the case without the vibration absorber, 3
It can be seen that the vibration absorption effect of the present invention is clearly good within the range of 0 Hz to 100 Hz, and the results of the experiments and the results of the theoretical inference correspond to each other. By selecting a vibration absorber that can be suppressed, it is possible to achieve the object of effectively suppressing the vibration of the optical disk drive main body 1.

[Table 1]

[0018]

Since the present invention is configured as described above, the following effects can be obtained.

In the vibration damping device for an optical disk drive according to the present invention, a vibration absorber having an appropriate rigidity and damping coefficient is designed to be mounted on the optical disk drive main body. The vibration absorber can reduce vibration in a specific frequency range.
Because the structure of the vibration absorber is simple and easy to install, and because the vibration damping structure is analyzed by a simplified force diagram, and based on the analysis result, a vibration absorber having the best coefficient is selected. Therefore, the optical disk drive vibration damping device of the present invention has an advantage that it is easy to assemble, and can obtain the best vibration damping effect.

[Brief description of the drawings]

FIG. 1 is a side view of a rotating body of a conventional optical disk drive.

FIG. 2 is a plan view of the vibration absorbing device according to the embodiment of the present invention.

FIG. 3 is a front view of the vibration damping device according to the embodiment of the present invention.

FIG. 4 is a diagram showing a dynamic relationship of each part in the embodiment of the present invention.

FIG. 5 is a diagram showing the relationship between the frequency response amplitude of the optical disk drive body and the frequency in the inference result of the theory relating to the embodiment of the present invention, and the attenuation ratio ξ3 is 0.1.

FIG. 6 is a diagram showing the relationship between the frequency response amplitude of the optical disk drive body and the frequency in the inference result of the theory relating to the embodiment of the present invention, and the attenuation ratio ξ3 is 0.01.

FIG. 7 is a diagram showing the relationship of the frequency response amplitude of the optical disk drive main body to the frequency in the experimental results of the example of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Optical disk drive main body 2 Object having mass and moment of inertia 3 Elastic body 4 Damping elastic body of conventional design 5 Rotor of main shaft motor 6 Disk 7 Clamper

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-6-52092 (JP, U) JP-A 2-144191 (JP, U) (58) Fields surveyed (Int. Cl. ⁷ , DB name) G11B 33/08 G11B 19/20

Claims (5)

(57) [Claims] 1. A plurality of sets of vibration absorbers, one set of vibration absorbers being composed of one object having a mass and moment of inertia effect and at least one elastic body having a rigidity and a damping coefficient. The optical disk drive body (1) by providing the vibration absorber to the optical disk drive components
A vibration damping device for an optical disk drive, characterized by being able to absorb vibrations of the optical disk. 2. The vibration damping device for an optical disk drive according to claim 1, wherein said vibration absorber is configured to be provided on an optical disk drive main body of the optical disk drive. 3. The vibration absorber is provided in a combination of the disk mounting structure of the optical disk drive and the optical disk drive body (1), so that the vibration of the combination of the disk mounting structure and the optical disk drive body (1) is reduced. 2. The vibration damping device for an optical disk drive according to claim 1, wherein the vibration damping device is configured to be able to absorb the light. 4. A combination of a disk mounting structure of an optical disk drive and an optical disk drive body (1), wherein the vibration absorber is provided on a component of the disk mounting structure therein. Optical disk drive damping device. 5. A combination of a disk mounting structure of an optical disk drive and an optical disk drive body (1), wherein the vibration absorber is configured to be provided on a part of the optical disk drive body (1) therein. 3
The vibration damping device for an optical disk drive according to the above.