CN1360313A - Broadband roller balancer of optical driver - Google Patents

Abstract

The invention relates to a balancing device for roller type of optical driver used for computer assembly with wider range of rotation speed or operating at low rotation speed. The invented device includes main body or rotary body, multi magnetic rollers made of magnetic material in the main body, magnetic iron surrounded by the multi roller and rolling stop units surrounding the multi magnetic rollers.

Description

Broadband roller balancer of optical driver

The invention belongs to the machine element balance device, particularly a kind of broadband roller balancer of optical driver.

Traditional CD-ROM driver roller balance device (Ball Balancer) ties up to and lays particular stress on that the heart (imbalance) rotary body (rotor) is gone up the concentric track of additional one or more and rotating shaft and roller free to rotate on (Race) on track.After the rotating speed of rotary body was higher than a certain critical rotary speed, additional roller can be rolled into the position of balance automatically along with laying particular stress on how much the reaching the orientation of the heart, thereby reaches the purpose that reduces carrier vibration and noise.Yet, the balance device that this is traditional, when the rotating speed of rotary body is less than or equal to this critical velocity (critical rotation speed), not only can't balance lay particular stress on the heart, the orientation that can be rolled into center of gravity because of roller adds the vibratory output of larger vector on the contrary, so very wide or in some ranges of speeds in the application scenario of slow-speed of revolution running, just have no usage.

The purpose of this invention is to provide a kind of, broadband roller balancer of optical driver that slow-speed of revolution operational effect good wide applicable to the range of speeds.

The present invention includes the body be located on the rotary body, be arranged at intrinsic a plurality of magnetic conduction rollers of making by permeability magnetic material, the magnetic conduction iron that centers on for a plurality of magnetic conduction rollers and only roll the unit around a plurality of magnetic conduction rollers.

Wherein:

Group is provided with the magnetic conduction disk of being made by permeability magnetic material on the magnet; Magnetic conduction disk outer rim is concentric with the turning axle of rotary body.

Only rolling the unit is deformable circular elastic body.

Only rolling the unit is formed in one in the wavy face that only rolls of body inner peripheral surface.

Because the magnetic conduction iron that the present invention includes the body be located on the rotary body, be arranged at intrinsic a plurality of magnetic conduction rollers of being made by permeability magnetic material, centers on for a plurality of magnetic conduction rollers reaches and only rolls the unit around a plurality of magnetic conduction rollers.When rotary body is static,, make the magnetic conduction roller be attracted to the magnet outer rim by the magnetic circuit of magnet; When rotary body begins with after the fixed rotating speed rotation, the magnetic conduction roller is subjected to lay particular stress on vibration force that the heart causes and radial direction that magnet outer rim tangential direction comes from rotary body simultaneously and points to the suction in the center of circle from magnet and come from the centrifugal force away from the center of circle that the rotary body rotation caused and make a concerted effort.When centrifugal force equaled magnetic force, the magnetic conduction roller can break away from the magnetic conduction disk, and utilized the centrifugal force after the magnetic conduction roller breaks away from the magnetic conduction disk, made only to roll unit local deformation the magnetic conduction roller is encased, and stoped the magnetic conduction roller to roll only rolling on the unit inner edge.When rotary body stopped the rotation, the centrifugal force that acts on this magnetic conduction roller and then disappeared, and then only rolled the magnet outer rim reinstatement attitude that elastic force that the unit produces because of distortion can push back the magnetic conduction roller tool magnetic force.Not only wide applicable to the range of speeds, and slow-speed of revolution operational effect is good, thus reach purpose of the present invention.

Fig. 1, for structural representation cut-open view of the present invention.

Fig. 2, for structural representation vertical view of the present invention.

Fig. 3, for magnetic figure of the present invention.

Fig. 4, be magnetic conduction roller action synoptic diagram among the present invention.

Fig. 5, for magnetic force index variation coordinate diagram of the present invention.

Fig. 6, be magnetic conduction roller of the present invention action synoptic diagram (when centrifugal force equals magnetic force).

Fig. 7, for magnetic force index variation coordinate diagram of the present invention (when centrifugal force equals magnetic force).

Fig. 8, be structural representation vertical view of the present invention (only roll unit for and the integrated wavy face that only rolls of body).

Below in conjunction with accompanying drawing the present invention is further elaborated.

As shown in Figure 1 and Figure 2, the present invention includes body 12, a plurality of magnetic conduction roller 14, lid 15, magnet 16, magnetic conduction disk 17 and only roll unit 18.

Body 12 is mounted on the turning axle 11 of CD-ROM driver rotary body 10, and is the center of circle with turning axle 11, is arranged with toroidal cavity shape accommodation space 13 on it.

Magnetic conduction roller 14 is the sphere made from permeability magnetic material, the rolling body of cylindrical or any rolling shape.

The disk body of magnetic conduction disk 17 for making with permeability magnetic material.

Only roll the deformable circular elastic body of unit 18 for making with the rubber elastomeric material, its external diameter is corresponding with body 12 accommodation spaces 13 internal diameters.

Magnetic conduction disk 17 is mounted on the magnet 16, and the center in magnet 16 suitably is fixed in accommodation space 13, and its outer rim is concentric with the turning axle 11 of rotary body 10; More than one magnetic conduction roller 14 is arranged in body 12 accommodation spaces 13, and is positioned at magnet 16 and magnetic conduction disk 17 outsides, around magnet 16 and magnetic conduction disk 17; Lid 15 is arranged in the openend of body 12 accommodation spaces 13, with sealing accommodation space 13; Only roll unit 18 and place in body 12 accommodation spaces 13, and be surrounded on a plurality of magnetic conduction rollers 14 peripheries, only roll element 18 and fix with its outer peripheral face and accommodation space 13 inner peripheral surfaces by mode cemented or that fix.

When rotary body 10 was static, as shown in Figure 3, Figure 4, the magnetic circuit by magnet 16 and magnetic conduction disk 17 are constituted made magnetic conduction roller 14 be attracted to magnetic conduction disk 17 or magnet 16 outer rims.

After rotary body 10 beginnings were with the fixed rotating speed rotation, magnetic conduction roller 14 suffered power comprised:

1) power of magnetic conduction disk 17 outer rim tangential directions

Come from the vibration that the heart causes of laying particular stress on of rotary body 10, when rotating speed＜critical velocity, this power can be ordered about magnetic conduction roller 14 to the orientation that lays particular stress on the heart, and vibratory output is strengthened.When rotating speed＞critical velocity, this power can be ordered about magnetic conduction roller 14 and be rolled to the other side who lays particular stress on heart orientation, reaches the effect that balance lays particular stress on the heart, and vibratory output is reduced.

2) power of the radial direction of magnetic conduction disk 17

1/ comes from the suction that magnet 16 points to the center of circle, and its size is: $F_{\mathrm{magnet}}=F_{1}e-\frac{x}{a}$

Wherein F is the magnetic force of magnetic conduction roller 14 when leaning against magnetic conduction disk 17 outer rims.As Fig. 4, shown in Figure 5, when magnetic conduction roller 14 break away from magnetic conduction disks 17 and and when existing for the gap of X between the magnetic conduction disk 17, F _MagmetCan cause exponential taper.

2/ comes from the centrifugal force away from the center of circle that rotary body 10 rotations are caused, and its size is:

F _centrifgal＝mrω ²

Wherein

R is the radius of turn at place, magnetic conduction roller 14 center

ω is a rotational speed

M is the quality of magnetic conduction roller 14

When magnetic conduction roller 14 leans against magnetic conduction disk 17 outer rims, promptly between magnetic conduction disk 17 and the magnetic conduction roller 14 during the X=0 of crack, suppose that this moment, the radius of turn at magnetic conduction roller 14 place, center was r ₀The time, then

F _centrifgal＝mr ₀ω ²

r＝r ₀

As Fig. 6, shown in Figure 7, when centrifugal force equaled magnetic force, magnetic conduction roller 14 can break away from magnetic conduction disks 17, then this moment rotational speed ${\mathrm{\&omega;}}_1=\sqrt{\frac{F_1}{\mathrm{<figure-callout\; id="0"\; label="m\; r"\; filenames="A0013698400083.png"\; state="\{\{state\}\}">m</figure-callout>}{r}_{}{}_0}}$

And ω ₁Second cosmic velocity for magnetic conduction roller 14.Design F ₁, m, r ₀Make ω ₁Greater than critical rotary speed ω _Critical, after promptly magnetic conduction roller 14 can be rolled to the equilibrium position, just can break away from magnetic conduction disk 17 because of the increase gradually of rotating speed.

Only roll unit 18 for deformable elastomer, utilize the centrifugal force after magnetic conduction roller 14 breaks away from magnetic conduction disk 17, make and only roll unit 18 local deformations magnetic conduction roller 14 is encased, and stop magnetic conduction roller 14 to roll on unit 18 inner edges only rolling, so magnetic conduction roller 14 is maintained at its previous equilibrium position.

As shown in Figure 7, suppose that magnetic conduction roller 14 breaks away from magnetic conduction disks 17 after, the radius of turn that is blocked at the place, magnetic conduction roller 14 center of only rolling unit 18 is r ₁, this moment X=X ₁Even, ω＜ω _Critical, as long as

F _magnet＜F _centrifgal r＝r ₀

F _ElasticTill roll the screen resilience of unit 18, magnetic conduction roller 14 can maintain equilibrium state, rotating speed can be extended downward be lower than ω _CriticalThe zone, thereby broken through the restriction of conventional balanced device, enlarged the application scenario.

When rotary body 10 stops the rotation, act on the F of this magnetic conduction roller 14 _CentrifgalAnd then disappear, then only roll the F that the unit produces because of distortion _Elastic Magnetic conduction roller 14 can be pushed back magnetic conduction disk 17 outer rims of tool magnetic force and reply the preceding state that activates.

As shown in Figure 8, the present invention also can be directly on body 12 one-body molded for be located at accommodation space 13 inner peripheral surfaces wavy only roll face 19 only roll unit 18 ', magnetic conduction roller 14 is hit in body 12 accommodation spaces 13 after week breaking away from magnetic conduction disk 17, can not roll, thereby keep the previous equilibrium position of magnetic conduction roller 14 along week in the accommodation space 13.When rotary body 10 stopped the rotation, the magnetic line of force that produces by magnet 16 and magnetic conduction disk 17 sucked back magnetic conduction roller 14 to magnetic conduction disk 17 outer rims, replys the state before activating.

Claims (4)

1, a kind of broadband roller balancer of optical driver, it comprises a plurality of rollers; It is characterized in that described a plurality of roller is to be arranged at the intrinsic magnetic conduction roller of being made by permeability magnetic material; Body is located on the rotary body; Be provided with the magnetic conduction iron that centers on for a plurality of magnetic conduction rollers and only roll the unit in body interior around a plurality of magnetic conduction rollers.

2, broadband roller balancer of optical driver according to claim 1 is characterized in that group is provided with the magnetic conduction disk of being made by permeability magnetic material on the described magnet; Magnetic conduction disk outer rim is concentric with the turning axle of rotary body.

3, broadband roller balancer of optical driver according to claim 1 is characterized in that the described unit that only rolls is deformable circular elastic body.

4, broadband roller balancer of optical driver according to claim 1 is characterized in that the described unit that only rolls is formed in one in the wavy face that only rolls of body inner peripheral surface.

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