CN100561586C - Shock-absorbing means - Google Patents

Abstract

The present invention is a kind of shock-absorbing means, and this shock-absorbing means is arranged on the bare engine module of CD player, suppresses the vibration that bare engine module produces in each rotation speed operation, and this shock-absorbing means comprises: body is installed on this bare engine module; The damping body, but elasticity is arranged on this body up and down; Actuation element is arranged on this body and is connected this damping body, and the thrust that promotes this damping body lifting is provided; And controller, control the thrust of this actuation element output according to the rotation speed change of this bare engine module, and then change the lifting elasticity absorption of this damping body, and reduce the displacement of this bare engine module and relative vibration; A kind of shock-absorbing means of the present invention can suppress the vibration that the bare engine module of CD player produces in various rotating speeds.

Description

Shock-absorbing means

Technical field

The invention relates to a kind of shock-absorbing means, particularly about a kind of shock-absorbing means that is applied in CD player.

Background technology

After blue light HD-DVD (high-density multifunction digital videodisc), estimate the disc storage technology towards more highdensity medium development, for example near field storage, 3D storing technology or the like, under this development trend, the read/write head of CD player and the distance of disc are littler thereupon, so the read/write head of CD player causes the interference vibrated just responsive more for disc because of rotation.Because disc can produce vibration greatly under rotation, bare engine module in the CD player can be adjusted disc rotation speed with the reading and writing that are fit to disc data or wipe according to writable status, so the running of CD player is not to be under the fixed rotating speed, the frequency that produces main vibration neither certain value.

At present the shock-absorbing means (Dynamic Vibration Absorber) used of CD player can only carry out vibration damping at the vibration that produces under certain specific rotation speeds and handles, as builds emerging, Asus (ASUS) and pioneer manufacturers such as (Pioneer) successfully is applied in shock-absorbing means on the CD player.As shown in Figure 1, it is that existing shock-absorbing means 11 is applied in the floor map on the CD player 1, this shock-absorbing means 11 is made of a plurality of second elastic bodys 111 and the damping body 112 that combines with this second elastic body 111, this shock-absorbing means 11 is combined on the bare engine module 13 of this CD player 1, this bare engine module 13 is arranged on one and is combined with on the bearing part 14 of first elastic body 12, and this first elastic body 12 is connected on the housing 15 of this CD player 1, can reduce the vibration that produces in these bare engine module 13 operation process by the setting of this first elastic body 12, the vibration that the setting of this shock-absorbing means 11 can absorb this bare engine module 13 reaches the effect of vibration damping.

This shock-absorbing means 11 be arranged on this CD player 1 bare engine module 13 Theoretical Framework as shown in Figure 2, the equation of motion of this bare engine module 13 is expressed as:

m ₁x ₁+c ₁x ₁+c ₂(x ₁-x ₂)+k ₁x ₁+k ₂(x ₁-x ₂)＝F(t)＝pω ²e ^jωt

m ₂x ₂+c ₂(x ₂-x ₁)+k ₂(x ₂-x ₁)＝O _f

Wherein, this m ₁Be the quality of bare engine module 13, m ₂Be the quality of damping body 112, x ₁Be the vibration displacement of bare engine module 13, x ₂Be the vibration displacement of damping body 112, F (t) be the rotation out-of-balance force with respect to the function of time, p is the rotation amount of unbalance, ω is a rotating speed, k ₁Be the elasticity coefficient of first elastic body 12, k ₂Be the elasticity coefficient of second elastic body 111, c ₁Be the damping of first elastic body 12, c ₂It is the damping of second elastic body 111.

Simplify conversion, the vibration displacement x of this bare engine module 13 by above-mentioned equation of motion ₁Can be written as:

$\left|{\mathrm{<figure-callout\; id="1"\; label="X"\; filenames="C2005101274840009H2.png"\; state="\{\{state\}\}">X</figure-callout>}}_1\right|=\frac{\sqrt{{\left\{\right[k_2-{\mathrm{\&omega;}}^2{m}_2]{\mathrm{\&Delta;}}_R+{\mathrm{<figure-callout\; id="2"\; label="c"\; filenames="C2005101274840010H2.png"\; state="\{\{state\}\}">c</figure-callout>}}_2\mathrm{\&omega;}{\mathrm{\&Delta;}}_I\}}^2+{\{{\mathrm{<figure-callout\; id="2"\; label="c"\; filenames="C2005101274840010H2.png"\; state="\{\{state\}\}">c</figure-callout>}}_2\mathrm{\&omega;}{\mathrm{\&Delta;}}_R-[k_2-{\mathrm{\&omega;}}^2{m}_2\left]{\mathrm{\&Delta;}}_I\right\}}^2}}{{\mathrm{\&Delta;}}_{\mathrm{<figure-callout\; id="2"\; label="R"\; filenames="C2005101274840010H2.png"\; state="\{\{state\}\}">R</figure-callout>}}^2+{\mathrm{\&Delta;}}_I^2}p{\mathrm{\&omega;}}^2$ Hence one can see that, when the resonant frequency of this shock-absorbing means 11 equals the frequency of external force, promptly $\sqrt{{\mathrm{<figure-callout\; id="2"\; label="k"\; filenames="C2005101274840010H2.png"\; state="\{\{state\}\}">k</figure-callout>}}_2/{\mathrm{<figure-callout\; id="2"\; label="m"\; filenames="C2005101274840010H2.png"\; state="\{\{state\}\}">m</figure-callout>}}_2}=\mathrm{\&omega;},$ Can make the vibration displacement minimum of this bare engine module 13.But the elasticity coefficient k of this second elastic body 111 ₂Quality m with this damping body 112 ₂Be fixed value, therefore can only therefore when the rotating speed of bare engine module 13 changes, just do not have shock sucking function, cause bigger vibration sometimes at the external force absorbing (being certain specific rotation speeds) of characteristic frequency.

Therefore, how to overcome the disappearance of above-mentioned prior art, a kind of shock-absorbing means is provided, suppress the vibration that bare engine module produces in various rotating speeds, real problem for needing to be resolved hurrily at present.

Summary of the invention

For overcoming the shortcoming of above-mentioned prior art, fundamental purpose of the present invention is to provide a kind of shock-absorbing means, the vibration that the bare engine module of inhibition CD player produces in various rotating speeds.

For reaching above-mentioned purpose, the invention provides a kind of shock-absorbing means, be arranged on the bare engine module of CD player, suppress the vibration that bare engine module produces in each rotation speed operation, this shock-absorbing means comprises: body is installed on this bare engine module; The damping body, but elasticity is arranged on this body up and down; Elastic body is arranged on this body, so that the lifting elasticity of this damping body to be provided; Actuation element is arranged on this body and is connected this damping body, and the thrust that promotes this damping body lifting is provided; And controller, according to the rotation speed change of this bare engine module, control the thrust of this actuation element output, and then change the lifting elasticity of this damping body, absorb and reduce the displacement of this bare engine module and relative vibration.

Above-mentioned this body can be worker's shape structure, this body can be the worker's shape structure with two horizontal parts and a vertical component effect, this actuation element can be with respect to this vertical component effect lifting displacement, and at least one side that this damping body is positioned at this vertical component effect is connected this actuation element one side.This damping body can be the object with quality or moment of inertia, for example sheet metal or derby, and this damping body can be H shape structure, two damping bodies preferably can be set on this body.

Also can be provided with a guide rod on this body for sheathed this elastic body, this elastic body can be that for example spring, shell fragment, rubber or other have the equivalent structure of rigidity and damping.This actuation element can for example be voice coil motor (VCM), ceramic-type actuator (PZT), electromagnetic actuator or pneumatic actuator.

The thrust that this controller is controlled this actuation element is directly proportional with the working current of actuation element, square being directly proportional of the rotating speed of rotation out-of-balance force and bare engine module, and the equation of motion of this shock-absorbing means and bare engine module can be expressed as:

m ₁x ₁+c ₁x ₁+c ₂(x ₁-x ₂)+k ₁x ₁+k ₂(x ₁-x ₂)+iK _f＝F(t)＝pω ²e ^jωt

m ₂x ₂+c ₂(x ₂-x ₁)+k ₂(x ₂-x ₁)-iK＝O _f

Wherein, this m ₁Be the quality of bare engine module, m ₂Be the quality of damping body, x ₁Be that bare engine module produces displacement, x because of vibration ₂Be the vibration displacement of damping body, F (t) be the rotation out-of-balance force with respect to the function of time, p is the rotation amount of unbalance, ω is a rotating speed, k ₁Be the first elastomeric elasticity coefficient, k ₂Be elastomeric elasticity coefficient, c ₁Be the first elastomeric damping, c ₂Be elastomeric damping, K _fBe the force constant of actuation element, i is the working current of actuation element.

As i=b (x ₁-x ₂) time, the displacement x that this bare engine module vibration produces ₁Can be expressed as:

$\left|{\mathrm{<figure-callout\; id="1"\; label="X"\; filenames="C2005101274840009H2.png"\; state="\{\{state\}\}">X</figure-callout>}}_1\right|=\frac{\sqrt{{\left\{\right[({\mathrm{<figure-callout\; id="2"\; label="k"\; filenames="C2005101274840010H2.png"\; state="\{\{state\}\}">k</figure-callout>}}_2+b{K}_f)-{\mathrm{\&omega;}}^2{m}_2]{\mathrm{\&Delta;}}_R+{\mathrm{<figure-callout\; id="2"\; label="c"\; filenames="C2005101274840010H2.png"\; state="\{\{state\}\}">c</figure-callout>}}_2\mathrm{\&omega;}{\mathrm{\&Delta;}}_I\}}^2+{\{{\mathrm{<figure-callout\; id="2"\; label="c"\; filenames="C2005101274840010H2.png"\; state="\{\{state\}\}">c</figure-callout>}}_2\mathrm{\&omega;}{\mathrm{\&Delta;}}_R-[({\mathrm{<figure-callout\; id="2"\; label="k"\; filenames="C2005101274840010H2.png"\; state="\{\{state\}\}">k</figure-callout>}}_2+b{K}_f)-{\mathrm{\&omega;}}^2{m}_2\left]{\mathrm{\&Delta;}}_I\right\}}^2}}{{\mathrm{\&Delta;}}_{\mathrm{<figure-callout\; id="2"\; label="R"\; filenames="C2005101274840010H2.png"\; state="\{\{state\}\}">R</figure-callout>}}^2+{\mathrm{\&Delta;}}_I^2}p{\mathrm{\&omega;}}^2,$

Wherein b is a current constant.Order that hence one can see that $b=\frac{{\mathrm{\&omega;}}^2{m}_2-k_2}{K_f}$ The time, make the displacement minimum of this bare engine module vibration, when this bare engine module rotating speed or external force frequency shift, this shock-absorbing means adjustable current constant b makes the displacement minimum of this bare engine module.Shock-absorbing means of the present invention has that framework is simple, element reaches easy-to-assemble advantage less, reaches the vibration that the bare engine module that suppresses CD player produces in various rotating speeds, allows reading and writing or to wipe the process of disc data stable more smoothly.

Therefore shock-absorbing means of the present invention can solve the bare engine module of existing CD player just can't carry out effective absorbing when rotating speed changes problem.

Description of drawings

Fig. 1 is that existing shock-absorbing means is applied in the floor map on the CD player;

Fig. 2 is the Theoretical Framework synoptic diagram of existing single rotating speed shock-absorbing means;

Fig. 3 is the comprehensive architecture synoptic diagram of shock-absorbing means of the present invention;

Fig. 4 is that shock-absorbing means of the present invention is applied in the floor map on the bare engine module of CD player;

Fig. 5 is the Theoretical Framework synoptic diagram of shock-absorbing means of the present invention;

Fig. 6 A is the systematic parameter figure of shock-absorbing means of the present invention;

The bare engine module vibration Simulation Analysis figure that Fig. 6 B is; And

Fig. 6 C is emulation and the experimental result picture that shock-absorbing means of the present invention is set on CD player, shock-absorbing means of the present invention is not set and the bare engine module vibration of traditional shock-absorbing means is set.

Embodiment

Embodiment

See also Fig. 3 and Fig. 4, show the floor map on the comprehensive architecture figure of shock-absorbing means 21 of the present invention and the bare engine module 23 that this shock-absorbing means 21 is applied in CD player 2 respectively, as shown in the figure, this shock-absorbing means 21 is arranged on the bare engine module 23 of CD player 2, suppress the vibration that bare engine module 23 produces in each rotation speed operation, this shock-absorbing means 21 comprises: body 214, damping body 212, elastic body 211, actuation element 213 and controller 216.

In the present embodiment, being combined on the bare engine module 23 of a CD player 2 with shock-absorbing means 21 is example, this bare engine module 23 is arranged on one and is combined with on the bearing part 24 of first elastic body 22, and this first elastic body 22 is connected the housing 25 of this CD player 2, can reduce the vibration that this bare engine module 23 produces by the setting of this first elastic body 22 in operation process.

The body 214 of shock-absorbing means 21 can be for being installed on this bare engine module 23, this body 214 is I-shape construction, have two horizontal parts 2141 and a vertical component effect 2143, this actuation element 213 can be with respect to these vertical component effect 2143 lifting displacements, this damping body 212 is positioned at least one side of this vertical component effect 2143, is connected this actuation element 213 1 sides.In the present embodiment, these body 214 both sides respectively have a guide rod 215, and this actuation element 213 runs through and lifting is slidingly arranged in this vertical component effect 2143 with displacement.

But these damping body 212 elasticity are arranged on this body 214 up and down, and this damping body 212 is the objects with quality or moment of inertia, for example can be sheet metal or derby.In the present embodiment, have two damping bodies 212 that are H shape structure, be separately positioned on vertical component effect 2143 both sides of body 214, affixed with the both sides of this actuation element 213 respectively, can be with these actuation element 213 lifting displacements.

This elastic body 211 is arranged on this body 214, and the lifting elasticity of this damping body 212 is provided, and this elastic body 211 can be that for example spring, shell fragment, rubber or other have the equivalent structure of rigidity and damping.In the present embodiment, comprise that two elastic bodys 211 are set in respectively on the guide rod 215 of these body 214 both sides, and be combined in this damping body 212.

This actuation element 213 is arranged on this body 214, and is connected this damping body 212, and the thrust that promotes these damping body 212 liftings is provided.In the present embodiment, this actuation element 213 runs through and lifting is slidingly arranged in this vertical component effect 2143 with displacement, this actuation element 213 constitutes a voice coil motor (VCM) by coil 2131 and magnetic 2132, certainly in other embodiments, this actuation element 213 also can for example be ceramic-type actuator (PZT), electromagnetic actuator or pneumatic actuator.

This controller 216 is controlled the thrust that this actuation element 213 is exported according to the rotation speed change of this bare engine module 23, changes the lifting elasticity of this damping body 212, absorbs and reduce the displacement and relative vibration of these bare engine module 23 vibration generations.

See also Fig. 5, the thrust of these controller 216 these actuation elements 213 of control is to be directly proportional with the working current of actuation element 213, the rotation out-of-balance force is and square being directly proportional of bare engine module 23 rotating speeds, and the equation of motion of this shock-absorbing means 21 and bare engine module 23 is expressed as:

m ₁x ₁+c ₁x ₁+c ₂(x ₁-x ₂)+k ₁x ₁+k ₂(x ₁-x ₂)+iK _f＝F(t)＝pω ²e ^jωt

m ₂x ₂+c ₂(x ₂-x ₁)+k ₂(x ₂-x ₁)-iK＝O _f

Wherein, this m ₁Be the quality of bare engine module 23, m ₂Be the quality of damping body 212, x ₁Be the vibration displacement of bare engine module 23, x ₂Be the vibration displacement of damping body 212, F (t) be the rotation out-of-balance force with respect to the function of time, p is the rotation amount of unbalance, ω is a rotating speed, k ₁Be the elasticity coefficient of first elastic body 22, k ₂Be the elasticity coefficient of elastic body 211, c ₁Be the damping of first elastic body 22, c ₂Be the damping of elastic body 211, K _fBe the force constant of actuation element 213, i is the working current of actuation element 213.

As i=b (x ₁-x ₂) time, the displacement x of these bare engine module 23 vibrations ₁Can be expressed as:

$\left|{\mathrm{<figure-callout\; id="1"\; label="X"\; filenames="C2005101274840009H2.png"\; state="\{\{state\}\}">X</figure-callout>}}_1\right|=\frac{\sqrt{{\left\{\right[({\mathrm{<figure-callout\; id="2"\; label="k"\; filenames="C2005101274840010H2.png"\; state="\{\{state\}\}">k</figure-callout>}}_2+b{K}_f)-{\mathrm{\&omega;}}^2{m}_2]{\mathrm{\&Delta;}}_R+{\mathrm{<figure-callout\; id="2"\; label="c"\; filenames="C2005101274840010H2.png"\; state="\{\{state\}\}">c</figure-callout>}}_2\mathrm{\&omega;}{\mathrm{\&Delta;}}_I\}}^2+{\{{\mathrm{<figure-callout\; id="2"\; label="c"\; filenames="C2005101274840010H2.png"\; state="\{\{state\}\}">c</figure-callout>}}_2\mathrm{\&omega;}{\mathrm{\&Delta;}}_R-[({\mathrm{<figure-callout\; id="2"\; label="k"\; filenames="C2005101274840010H2.png"\; state="\{\{state\}\}">k</figure-callout>}}_2+b{K}_f)-{\mathrm{\&omega;}}^2{m}_2\left]{\mathrm{\&Delta;}}_I\right\}}^2}}{{\mathrm{\&Delta;}}_{\mathrm{<figure-callout\; id="2"\; label="R"\; filenames="C2005101274840010H2.png"\; state="\{\{state\}\}">R</figure-callout>}}^2+{\mathrm{\&Delta;}}_I^2}p{\mathrm{\&omega;}}^2$

Wherein b is a current constant; Order that hence one can see that $b=\frac{{\mathrm{\&omega;}}^2{m}_2-k_2}{K_f}$ The time, the vibration displacement minimum of this bare engine module 23, when these bare engine module 23 rotating speeds or external force frequency shift, this shock-absorbing means 21 can be adjusted b, makes the vibration minimum of this bare engine module 23.Therefore, shock-absorbing means 21 of the present invention has the advantage that framework is simple, element is few and be easy to assemble, the bare engine module 23 of realizing CD player 2 equal vibration damping effectively under various rotating speeds, and the process of read-write disc is more smooth, stable.

See also Fig. 6 A to Fig. 6 C, Fig. 6 A is the systematic parameter figure of shock-absorbing means 21 of the present invention, Fig. 6 B is the bare engine module vibration Simulation Analysis figure that shock-absorbing means of the present invention is set on CD player, shock-absorbing means of the present invention is not set and traditional shock-absorbing means is set, and Fig. 6 C is emulation and the result of experiment figure that shock-absorbing means of the present invention is set on CD player, shock-absorbing means of the present invention is not set and the bare engine module vibration of traditional shock-absorbing means is set.As shown in the figure, traditional as can be known shock-absorbing means (solid line) can only near absorbing effectively certain fixed frequency, utilize the present invention then can be with rotating speed or external force frequency shifts curve trough (Fig. 6 B with 6000rpm dotted line and 10000rpm dotted line as the embodiment of the invention), and shock-absorbing means of the present invention 21 under 6000rpm and 10000rpm rotating speed respectively than adopting traditional shock-absorbing means to increase by 38% and 42% absorbing efficient.

In sum, shock-absorbing means 21 of the present invention is made of with controller 216 body 214, actuation element 213, damping body 212, elastic body 211, and the rigidity of this elastic body 211 and damping can be considered the k of system ₂With c ₂, the quality of this damping body 212 is considered as the m of system ₂, because of the thrust of this actuation element 213 is by current i and force constant K _fMultiply each other, pass through to adjust this actuation element 213 of Current Control as can be known by above-mentioned theory and equation, make the vibration of this bare engine module 23 of bare engine module 23 under different rotating speeds of this CD player 2 be minimum, reach the effect of absorbing, and the disadvantages of solution prior art, possessed high industrial utilization.

Claims (10)

1. a shock-absorbing means is arranged on the bare engine module of CD player, suppresses the vibration that bare engine module produces in each rotation speed operation process, it is characterized in that this shock-absorbing means comprises:

Body is installed on this bare engine module;

The damping body, but elasticity is arranged on this body up and down;

Elastic body is arranged on this body, so that the lifting elasticity of this damping body to be provided;

Actuation element is arranged on this body and is connected with this damping body, and the thrust that promotes this damping body lifting is provided; And

Controller is controlled the thrust of this actuation element output according to the rotation speed change of this bare engine module, and then changes the lifting elasticity of this damping body, absorbs and reduces the displacement of this bare engine module and relative vibration.

2. shock-absorbing means as claimed in claim 1 is characterized in that, this elastic body is spring, shell fragment or rubber.

3. shock-absorbing means as claimed in claim 1 is characterized in that, this damping body is sheet metal or the derby with quality.

4. shock-absorbing means as claimed in claim 1 is characterized in that, this damping body has the sheet metal or the derby of moment of inertia.

5. shock-absorbing means as claimed in claim 1 is characterized in that, this damping body is H shape structure.

6. shock-absorbing means as claimed in claim 1 is characterized in that, the quantity of this damping body is two, is arranged at the vertical component effect both sides of this body respectively.

7. shock-absorbing means as claimed in claim 1 is characterized in that, this body is worker's shape structure.

8. shock-absorbing means as claimed in claim 1, it is characterized in that this body is the I-shape construction with two horizontal parts and a vertical component effect, this actuation element can be with respect to this vertical component effect lifting displacement, this damping body is positioned at least one side of this vertical component effect, connects a side of this actuation element.

9. shock-absorbing means as claimed in claim 1 is characterized in that, also is provided with a guide rod on this body and is used for sheathed this elastic body.

10. shock-absorbing means as claimed in claim 1 is characterized in that, this actuation element is voice coil motor, ceramic-type actuator, electromagnetic actuator or pneumatic actuator.

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