CN2569283Y - Inertia locking device - Google Patents

Abstract

The utility model relates to an inertia locking device which is used for keeping an actuator of a disc drive in a proper position when the disc drive is in a non-working state. The Inertia locking device comprises a locking element which can be pivoted and at least one inertia body which is in contact with the locking element, wherein the inertia body is contained in a concave part which is formed by the wall surfaces of the locking element and a base of the inertia locking device. The configuration of the wall surfaces enables the locking element to be moved to a closed state when the disk drive suffers a shock force. Therefore, the actuator of the disk drive is locked.

Description

The inertia lock

[technical field]

The utility model relates to a kind of inertia lock, refers to especially in a kind of disc driver that is applicable to portable computer, the inertia lock of simple in structure, dependable performance and not power consumption.

[technical background]

In computer system, information often is stored on a hard disk or the floppy disk thin magnetic film surface.These information stores realize reading of these information by a magnetic head assembly on concentric track.When storing or reading information, head gimbal directly contacts with magnetic disk surface to avoid magnetic head on the air-supported layer of the disk of high speed rotating.

In most disc driver, magnetic head all is mounted near the end of an actuator.Widely used actuator has linear pattern and rotary-type two kinds in the prior art.In the linear pattern actuator, magnetic head is at first over against the central authorities of disk, then actuator along disk radial direction straight line move with head position at preposition.And in rotary-type actuator, actuator rotates near the circumference of disk around rotation center, with this with head position at preposition.

When disc driver was not worked, magnetic head left the data field of disk.Disc driver can be divided into two kinds on dynamic importing type and contact start and stop type according to the ground that this moment, magnetic head was parked.In dynamic importing type disc driver, when the disc driver inoperation, magnetic head is withdrawn into a place away from disk, such as is parked on the oblique rail structure; And in contact start and stop type disc driver, when disc driver was not worked, magnetic head rested in the non-data field of disk central authorities.Magnetic head and disk any improper contacts the scuffing that all may cause disk, therefore is locked in magnetic head on the above-mentioned oblique rail structure reliably or is very important in the non-data field of disk central authorities.

In the prior art, there has been the structure of many lock actuator.Such as in some disc driver, when disc driver cuts off the power supply, its actuator is by a magnetic devices or snap switch fixing, and when disc driver is switched on, make actuator drive the data field that magnetic head moves to disk thereby the motor of actuator overcomes the retain strength of magnetic devices or snap switch.If yet said structure is the influence that is given a shock, when off working state, causes contacting of magnetic head and disk thereby its actuator may break away from the constraint of magnetic devices or snap switch.

Also have a kind of structure that relies on snap switch and solenoid to come lock actuator, when solenoid non-energized, snap switch is locked in the precalculated position with actuator, and after the solenoid energising, can discharge the actuator that is locked by snap switch.Although this design can avoid the influence that shakes, solenoid to have cost height, unreliable and shortcoming that power consumption is big.Correlation technique please refer to United States Patent (USP) the 4th, 716, and No. 480 and 4,725, No. 907.

Rotary-type actuator is given a shock and the influence of acceleration especially easily.But owing to when the rotary-type actuator of design, can make actuator reach balance with respect to the point of rotation, simple translation vibrations will act on the both sides of the point of rotation simultaneously and actuator is affected.Smaller non-equilibrium factor such as the error that causes because of manufacturing, also is not enough to actuator is exerted an influence.But the inertial force that the rotation vibrations cause then is easier to cause waving of actuator, so just probably magnetic head is contacted with disk, therefore, need provide a kind of safeguard measure to overcome this inertial force.For portable computer, they operate in particular environment especially, very easily are subjected to rotating the influence of vibrations in the process that moves, so more need to provide this safeguard measure that overcomes inertial force.

The ability of lock response revolving force can be weighed by its moment of inertia, and the ability of friction torque is then mainly by its measuring quality between response back shaft and coasting body, and therefore, the whole efficiency of lock is proportional to moment of inertia, and is inversely proportional to its quality.

Above-mentioned factor is particularly important to small-sized disc driver.For example, one 1.8 inches drivers, it has a coasting body that is installed on the sliding bearing, and the ratio of its moment of inertia and its quality is limited at approximate 50～100gm-mm ²/ gm, the linear acceleration of the cooperation 300g grade that this lock can not be successful like this.This problem can alleviate as pivotal point by using ball bearing or ball bearing, but it will increase cost and increase encapsulated space.

In addition, in this type of mini disc driver, coasting body is very crucial about the statical equilibrium of its pivotal point.Any static unbalance all will produce a moment of torsion on coasting body, and if this moment of torsion act directly in the operational process of coasting body, then locking it will lose efficacy.

Even in the problems referred to above, the ratio of moment of inertia and its quality has satisfied definite 50-500gmm ²The numerical value of/g obtains maximum moment of inertia when making the coasting body center of gravity be positioned at pivotal point, also has to coasting body is positioned at be lower than (during polydisc sheet driver) between recording disc sheet place or the disc.In said structure, will collide the disk sheet surface when coasting body is subjected to high speed impact power, thereby influence the reliability of system.In addition, in many disk sheets driver, the coasting body device makes installation and replacement disk sheet become difficult between disk sheet.The danger of the destruction disk sheet that when installation or removal inertia lock, increases simultaneously.

[summary of the invention]

The purpose of this utility model provides a kind of disk inertia lock with simple in structure, dependable performance and not power consumption.

The purpose of this utility model is achieved through the following technical solutions: one remains on its actuator when being used to make disc driver be in off working state the rotatory inertia lock of appropriate location, and it comprises a pivotable locking member and the coasting body that at least one contacts with this locking member.This coasting body is contained in the formed recess of wall of locking member and inertia lock pedestal, and when the configuration of these walls made this disc driver be subjected to a shaking force, locking member moved to closed condition, thereby the actuator of disc driver is locked.

The advantage of the utility model disc driver is: compared with prior art, this inertia lock is simple in structure, and dependable performance and not power consumption are specially adapted to use the portable computer disc driver of battery.

[description of drawings]

In conjunction with the embodiments the utility model is further described with reference to the accompanying drawings.

Fig. 1 is the vertical view of the utility model inertia lock.

Fig. 2 a-2d is respectively the constitutional diagram of the utility model inertia lock when being subjected to the four direction shaking force.

Fig. 3 is the utility model inertia lock and other each parts fiting relation figure of disc driver.

Force analysis figure when Fig. 4 a-4e is the first different directions shaking force of the locking member of the utility model inertia lock.

Fig. 5 is the acceleration of locking member of the utility model inertia lock and the function relation figure of shaking force direction.

[embodiment]

Please refer to Fig. 1, the utility model inertia lock 400 will overcome the problems referred to above.This inertia lock 400 has a spin locking element 401, and it can pivot around an axostylus axostyle 402.The extension downwards of these locking member 401 1 ends is provided with an outstanding catch 403.When this locking member 401 when axostylus axostyle 402 pivots, catch 403 cooperates with the grab 404 that is located at actuator 405 1 ends.The 405 clockwise rotations of one block, 420 limiting actuators.

Axostylus axostyle 402 is located at the appropriate position of these lock 400 pedestals 406, and this pedestal 406 has protuberance 407,408a, 408b.Forming two recesses, 409,411, two inertia balls 410,412 with respect to these protuberances 407,408a, 408b and locking member 401 is arranged at respectively in this two recess 409,411.One spring 413 is by locating piece 414,415,416 flexible being positioned on the inertia lock 400.One cover plate (figure does not show) is installed in pedestal 406 tops and is contained in respectively in the recess 409,411 to keep inertia ball 410,412.

The shape of recess 409,411 has a significant impact the function of inertia lock 400.The shape of this recess 409 is limited by wall 409a, 409b, 409c, 409d, and the shape of recess 411 is then limited by wall 411a, 411b, 411c, 411d.The open direction of the recess that recess 409,411 every pair of outer adjacent walls form should keep opposite direction setting with the direction that another recess that adjacent surface is formed is opened, in present embodiment, 409a, 409b form a downward opening portion, and 409c, 409d then form in contrast an opening portion that makes progress.

Because of brass has higher proportion, anticorrosive, characteristics such as nonmagnetic, it is good that the material of inertia ball 410,412 is selected with brass.And because its non-magnetic characteristics, this inertia lock 400 can be placed in voice coil motor magnets near.Other materials with similar characteristics also can be selected.It is good that the material of spring 413 is selected with beallon nonmagnetic and that intensity is high.

In the present embodiment, inertia ball 410,412 is as inertial mass body.Locking member 401 and pedestal 406 select for use the material of rigidity height (resistance to deformation), proportion little (alleviating quality), low-friction coefficient (interactions that coordination and inertia ball are 410,412) to make.

Please refer to Fig. 2 a, the shaking force direction to the right.Suppose shaking force enough greatly to overcome the moment of torsion of spring 413, inertia ball 412 pushes away locking member 401 left, and it is counterclockwise rotated, and makes catch 403 enter grab 404, thereby stops the actuator rotation.At this moment, the protuberance 407 of 410 pairs of pedestals 406 of inertia ball is exerted pressure and locking action is not provided.

Please refer to Fig. 2 b, the shaking force direction left.Inertia ball 410 is exerted pressure to locking member 401 to the right, and it is counterclockwise rotated, and comes to the same thing with situation shown in Figure 17 A.And 412 couples of protuberance 408a of another inertia ball, the 408b wall is exerted pressure, and does not have locking action.

Please refer to Fig. 2 c, the shaking force direction upwards.In this case, inertia ball 410,412 is all in running order.Inertia ball 410 is pressed into the space that has certain angle that is formed by face 409c and 409d, the space that has certain angle that another inertia ball 412 stressed entering surface 411c and 411d form.Because face 409c, 409d, 411c, 411d wall profile are limit, make locking member 401 rotate in the counterclockwise direction, thereby make catch 403 stop grab 404, realize locking action.

Please refer to Fig. 2 d, shaking force is directed downwards.Inertia ball 410 interacts with face 409a and 409b, and another inertia ball 412 interacts with face 411a and 411b, thereby locking member 401 is rotated counterclockwise, and reaches the effect that above-mentioned catch 403 stops grab 404, thereby with actuator 405 lockings.

In above-mentioned four kinds of situations, have only when shaking force is enough big, inertia ball 410,412 could fully overcome the moment of torsion of spring 413 and move.After shaking force, spring 413 recovers deformation, and inertia locking member 401 recovers position as shown in Figure 1.

Can do multiple variation according to prior art embodiment, can adopt multiple mechanical component, comprise torsionspring, volute spring, magnetic spring, laminated spring etc. as above-mentioned spring 413.Inertia ball 410,412 can adopt other shapes, as plate-like, wedge shape etc.Locking member 401 and pedestal 406 also can adopt other suitable shapes according to principle of design of the present utility model.

General disc driver has a clamping device (as 504 structures of Fig. 3) in addition.Disc driver is through a clockwise angular acceleration, and actuator is positioned at idle state by clamping device.When predefined critical acceleration, this clamping device can not suppress actuator, and the inertia lock is triggered actuator is locked.

When counterclockwise rotation shakes, actuator 405 swings, thereby collision block 420 (Fig. 1).Because of block 420 is generally speaking made by material with resilience, thereby actuator 405 is rebounded and overcome the elastic force of clamping device.One of benefit of lock 400 is that this lock 400 can be triggered by the clockwise or counterclockwise angular acceleration around the disc driver center of gravity and actuator be locked in the present embodiment.The angular acceleration of disc driver is logical to be produced and can produce a linear acceleration (the linear acceleration size equals angular acceleration and multiply by distance between the point of rotation and inertia lock) at place, inertia lock 400 location.

For movable disc driver, when its shaking force maximum that when main frame or other equipment separate, produces.Please refer to Fig. 3, the poorest condition shown in it for the inertia locking.The CG point is the center of gravity of disc driver 500.502 rotations around the shaft of the inertia lock 501 of present embodiment.R _iExpression CG point is to the distance of rotating shaft 502.Suppose that at power F bump disc driver 500 arm of force that power F is ordered to CG is with R _fExpression.

Actuator 503 is suppressed by clamping device 504 and inertia lock 501, and spring 505 makes lock be in normally open.

Under power F effect, inertia locks its acceleration of 501 (A) and is:

A=F/M=-α R _i(1) wherein M and α represent the quality and the angular acceleration of disc driver 500 respectively.Then,

α=FR _f/ J (2) J represents the moment of inertia of disc driver 500.

In conjunction with formula (1) and formula (2):

A=α J/M R _f-α R _i(3) or A=R _iα (J/M R _iR _f-1) (4)

If α ₀For actuator 503 in the disc driver 500 will screw out the minimum angular acceleration of clamping device, A ₀The acting force that overcomes spring 505 for this inertia lock triggers the minimum angular acceleration of lock.For guaranteeing that actuator 503 screws out clamping device 504 preceding inertia lock 501 generation effects, then should satisfy the following relationship formula:

A ₀＜R _iα ₀(J/M?R _iR _f-1)(5)

Please refer to Fig. 4, the graph of a relation between the moment of torsion on the linear acceleration of inertia lock 400 and spring 505 or other biasing elements.When Fig. 4 a was inertia ball 410,412 and locking member 401 arranged side by side placements, inertia ball 410,412 contacted with locking member 412, and the radial distance of contact point and locking member 412 pivotal points is r.Pedestal 406 walls that inertia ball 410,412 is impaled are from the horizontal by the θ angle.The friction factor that inertia ball 410,412 and locking member are 401 is not considered in analysis.The value of θ when the scope that the triggering that the purpose of this analysis is to determine to make lock changes with the variation of shaking force direction obtains minimum value.

Suppose that inertia lock 400 is subjected to becoming with level the power F at β angle _A, and-(90 °-θ)＜β＜(90 °-θ).Fig. 4 b and 4c are the vector force analysis of inertia ball 410,412.Among Fig. 3, F _R410Expression pedestal 406 acts on the power of inertia ball 410, F _I410 Expression locking member 401 acts on the power of inertia ball 410.Among Fig. 4, F _R412Expression pedestal 406 acts on the power of inertia ball 412, F _I412Expression locking member 401 acts on the power of inertia ball 412.Certainly, 410,412 stressed F of each inertia ball _AAlso reach this inertia lock 400.

Please refer to Fig. 4 b, inertia ball 412 stressed level and vertical forces are decomposed balanced relationship:

F _Acosβ＝F _R410sinθ(6)

F _R410＝F _Acosβ/sinθ(7)

F _I410＝F _Rcosθ-F _Asinβ(8)

F _I410＝F _Acosθsinβ/sinθ-F _Asinβ(9)

Please refer to Fig. 4 c, inertia ball 412 stressed level and vertical forces are decomposed balanced relationship:

F _Acosβ＝F _R412sinθ(10)

F _R412＝F _Acosβ/sinθ(11)

F _I412＝F _Rcosθ+F _Asinβ(12)

F _I412＝F _Acosθsinβ/sinθ+F _Asinβ(13)

Locking piece 401 suffered moment of torsion τ:

τ＝r(F _R410+F _I412)(14)

τ＝2rF _Acosβ/tanθ＝2rmacosβ/tanθ(15)

M represents the quality of inertia ball 410,412, and a represents its linear acceleration.a ₀Spring or other biasing elements provided threshold moment of torsion τ when expression inertia lock will trigger ₀The time acceleration.

a ₀＝τ ₀tanθ/2mrcosβ(16)

Please refer to Fig. 4 d ,-(90 °-θ)＜during β＜90 °:

FI412＝FA(cosθcosβ/sinθ+sinβ)(17)

FI410＝0(18)

τ＝rF _I412＝rmacos(β-θ)/sinθ(19)

a ₀＝τ ₀sinθ/mrcos(β-θ)(20)

Please refer to Fig. 4 e, 90 °＜β＜(90 °+θ) time:

FR412＝FAcosβ/sinθ(21)

FR412＝FAsinβ+FR412cosθ(22)

FR410＝0(23)

a ₀＝-τ ₀sinθ/mrcos(β-θ)(24)

(90 °+θ)＜during β＜180 °:

a ₀＝-τ ₀tanθ/mrcos(β-θ)(24)

Therefore, locking member 401 is applied to the function that the moment of torsion of spring or other biasing elements is angle θ and shaking force direction (representing with β).Please refer to Fig. 5, the linear acceleration numerical value of the lock that cooperate with actuator, when θ was 60 °, this moment of torsion was the function of β.Maximum changing range approximately is 15%, and the θ optimum value is near 60 °.

Claims (8)

1. an inertia lock, be mounted on the disc driver to suppress the actuator in this disc driver, it comprises a pedestal, one is installed in a locking piece and the coasting body on this pedestal, it is characterized in that: this locking piece has one first wall, this pedestal has one second wall, this is first years old, second wall forms one first preset angle each other when locking piece is in open state, above-mentioned first coasting body be positioned at this first, between second wall, when this disc driver is subjected to shaking force on the first direction, this coasting body is through translation and this first, the contact of second wall, thereby this locking piece is gone to off-position, this actuator is suppressed.

2. inertia lock as claimed in claim 1, it is characterized in that: this locking member has one the 3rd wall, this pedestal has a wall face, three, the wall face forms one second preset angle each other when locking member is in open state, this first coasting body is decided to be the 3rd, between the wall face, when this disc driver is subjected to shaking force on the second direction, this first coasting body and the 3rd, wall face contact, this locking member is gone to off-position, this actuator is suppressed.

3. inertia lock as claimed in claim 1 is characterized in that: this inertia lock comprises that further one is positioned at second coasting body between this locking member and this pedestal.

4. inertia lock as claimed in claim 3 is characterized in that: this first and second coasting body generally is positioned at the rotation opposite side of this locking piece.

5. inertia lock as claimed in claim 3 is characterized in that: this first, second coasting body comprises a spheroid.

6. inertia lock as claimed in claim 1 is characterized in that: this inertia lock also have one with the biasing element of this inertance element effect.

7. inertia lock as claimed in claim 6 is characterized in that: this biasing element comprises a spring element.

8. inertia lock as claimed in claim 1 is characterized in that: this locking piece has an element that excites actuator when it is in latched position.

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