CN101849259B - Method and apparatus for vibration damping of a suspended media read/write head - Google Patents
Method and apparatus for vibration damping of a suspended media read/write head Download PDFInfo
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- CN101849259B CN101849259B CN200880114559.XA CN200880114559A CN101849259B CN 101849259 B CN101849259 B CN 101849259B CN 200880114559 A CN200880114559 A CN 200880114559A CN 101849259 B CN101849259 B CN 101849259B
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- shaven head
- motion
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- head
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B21/00—Head arrangements not specific to the method of recording or reproducing
- G11B21/16—Supporting the heads; Supporting the sockets for plug-in heads
- G11B21/22—Supporting the heads; Supporting the sockets for plug-in heads while the head is out of operative position
Abstract
A method of controlling a head for a recording medium includes determining that the head is in an inoperative state, and activating a damping arrangement in response to the determination that the head is inoperative. A movement of the head while the head is inoperative is sensed. The damping arrangement is used in response to the sensing step to exert a force upon the head to thereby damp the movement, a magnitude of the force being dependent upon a parameter of the movement.
Description
Technical field
The present invention relates to the method in the vibration of the period internal damping read/write head that shaven head does not operate.
Background technology
In disk drive, the device that is called as " shaven head " is used for the optical recording media such as compact disk (CD) is read or write.Can read and/or the shaven head write can be called as " read/write head " herein optical recording media.If compact disk is configured to be written into and can only be read, then sometimes be referred to as " CD-ROM ".
The laser diode of shaven head is read optical recording media on the ad-hoc location on the optical recording media and/or is write by energy is focused on.Operate at shaven head, that is, optical recording media is being read and/or in period of writing, on the direction of optical recording media, constantly activating shaven head, in order to keep the focusing of laser diode.Shaven head can comprise at least one permanent magnet, and can apply electromagnetic field to shaven head by allowing electric current flow through the coil adjacent with shaven head and activate shaven head.
Within the period that shaven head does not operate, need not shaven head is focused on the optical recording media.Therefore, in the known disc driver, when not operating, shaven head do not activate or controls the position of read/write head.
Therefore, with regard to prior art, both be not expected neither be apparent for any method of position of control read/write head within the period that shaven head does not does not read or write optical recording media.
Summary of the invention
The invention provides a kind of motion of the read/write head of sensing disk drive within the period that read/write head does not operate, then shaven head is applied reacting force in order to reduce the method for the motion of shaven head.In one embodiment, be used for when shaven head operates, activating bare headed same coil and also be used to when shaven head does not operate, activate shaven head.In a particular embodiment, sensing is by the electric current responded in coil of magnet in the shaven head of motion and/or at the voltage of coil two ends induction, and is used for generating and flows through the retroaction electric current of coil and/or the bucking voltage at coil two ends.Retroaction electric current and/or voltage cause retroaction electromagnetic force that shaven head is applied, thereby reduce amplitude and/or the speed of optical movement.
The present invention specifically can be applicable to by shaven head being applied its position is adjusted in magnetic field in order to shaven head is focused on read/write head on the recording medium.Can be by allowing electric current flow through adjacent windings and/or setting up magnetic field at adjacent windings two ends formation voltage.Shaven head can be attached on the permanent magnet that stands magnetic field.When shaven head stood vibration or undesirable motion when not operating, the associated movement of magnet can be set up magnetic field, can sense the motion of shaven head by this magnetic field.Specifically, the motion of magnet can be set up magnetic field, and this magnetic field induces electric current and/or induces voltage at the coil two ends in coil.Electric current and/or voltage that can sensing coil be in order to detect the motion of shaven head.
In one embodiment of the invention, the method for the shaven head of control recording medium comprises: determine that shaven head is in not mode of operation, and activate damping mechanism in response to definite shaven head does not operate.The motion of shaven head when the sensing shaven head does not operate.Damping mechanism is used in response to the sensing step shaven head being applied power, thus damped motion, and the size of power depends on the parameter of motion.
In another embodiment of the present invention, the method for the shaven head of console panel driver comprises: determine that shaven head is in not mode of operation.The power that when motion of shaven head and/or shaven head did not operate when the sensing shaven head did not operate shaven head is applied.In response to described sensing step shaven head is applied the damping electromagnetic force.
In yet another embodiment of the present invention, disk drive comprises the sensor of the power that applies for the motion of sensing shaven head and/or to shaven head.Damping unit and sensor couple, and in response to from the signal of sensor and shaven head is applied damping force.Controller and sensor and/or damping unit couple.When shaven head is in mode of operation, the inactive sensor of controller and/or damping unit.
An advantage of the invention is, within the period of not carrying out playback, can minimize the vibration of read/write head.
Another advantage of the present invention is, is used for when the same coil that during playback activates shaven head can be used in playback not the motion of not only sensing shaven head but also activates shaven head.
Another advantage of the present invention is, if shaven head is subject to oscillatory surge when not operating, then the present invention can be before the peak that it reaches with initial peak is associated the motion of damping shaven head.
Description of drawings
In conjunction with the drawings with reference to the following description of embodiments of the invention, above-mentioned and further feature and purpose of the present invention and the mode that obtains them will be more apparent, and the present invention itself will be better understood, in the accompanying drawings:
Fig. 1 is the block diagram of an embodiment of dish driving mechanism of the present invention.
Fig. 2 is the block diagram of more specifically embodiment of the dish driving mechanism of Fig. 1.
Fig. 3 is the process flow diagram for an embodiment of the inventive method of the shaven head of control recording medium.
Fig. 4 is in the situation that there is not damping action of the present invention, if the shaven head of Fig. 2 is impacted, and the exemplary plot of the voltage at the coil two ends of Fig. 2 and the relation of time then.
Fig. 5 is the process flow diagram for another embodiment of the inventive method of the shaven head of control recording medium.
Fig. 6 is the process flow diagram for another embodiment of the inventive method of the shaven head of control recording medium.
Fig. 7 is the block diagram of another embodiment of dish driving mechanism of the present invention.
Embodiment
Disclosed embodiment and be not intended to exhaustive or make the present invention be confined to disclosed concrete form in the following explanation hereinafter.On the contrary, selecting and describe these embodiment is in order to make those of ordinary skill in the art can utilize its instruction.
Forward now accompanying drawing to, specifically, forward Fig. 1 to, Fig. 1 shows an embodiment who comprises for the disk drive of the present invention 10 of the damping unit of effective vibration damping of read/write head 12.Shaven head 12 can have the laser diode 14 of reading and/or writing for to optical recording media 16.In particular embodiments illustrated herein, shaven head 12 reads medium 16 to be used for the playback purpose.Yet, should be understood that the present invention is not limited to read shaven head.For example, the present invention can be applied to recording medium is write but not read the shaven head of this medium.In one embodiment, medium 16 is compact disk (CD) or CD-ROM.
Playback servo logic 18 can keep the laser diode 14 of shaven head 12 suitably to focus on the medium 16.Servo logic 18 can receive the whether information of adequate focusing of indication diode 14 via link 20, perhaps can determine whether adequate focusing of diode 14.As following described in more detail, when switch 22 was in the close position, servo logic 18 can transmit control signal to actuator 24 via circuit 26.In response to the control of servo logic 18, actuator 24 can move shaven head 12 in the direction 28 towards and away from medium 26, thereby diode 14 is focused on the medium 16 better.
Detect logic 30 take playback and can determine shaven head 12 current operations of whether reading medium 16 as the controller of form, that is, whether disk drive 10 is in the playback operation pattern.Detect logic 30 and can receive via the link 32 to controller 34 the indication shaven head 12 current information that whether operating, perhaps can determine shaven head 12 current whether operations.Controller 34 can receive reading out data from shaven head 12 via link 36, and controller 34 can be controlled shaven head 12 via link 36.
Vibration-sensing device 38 can be via the signal of link 40 receptions from actuator 24.Can indicate the motion of shaven head 12 and/or existence, speed or the amplitude of vibration via the signal that link 40 receives.In an alternate embodiments, vibration-sensing device 38 is via existence, speed or the amplitude of motion and/or the vibration of link 42 direct sensing shaven heads 12.If there is link 40, then can not provide link 42; On the contrary, if there is link 42, then can not provide link 40.
Damping unit can involving vibrations abatement device 44 and is used for activating or the switching device of inactive vibration-sensing device 38 and/or vibration abatement device 44.Vibration abatement device 44 can be via the signal of link 46 receptions from vibration-sensing device 38.The same with the signal on the link 40, the signal on the link 46 can be indicated the motion of shaven head 12 and/or existence, speed or the amplitude of vibration.Yet, vibration-sensing device 38 can regulate and/or handle link 40 on signal so that the sign or specify the motion of shaven head 12 and/or existence, speed or the amplitude of vibration better or more clearly of the signal on the link 46.Vibration abatement device 44 can use or handle link 46 on signal to produce the signal on the link 48.When being applied to actuator 24, the signal on the link 48 can make actuator 24 to reduce or the mode of the vibration of 38 sensings of at least part of elimination vibration-sensing device activates shaven head 12.
In one embodiment, the signal on the link 46 and 48 vibrates.For example, the signal on the link 46 and 48 can be sinusoidal.Signal on the link 48 can differ about 180 degree in phase place with signal on the link 46, thereby when the signal on the link 48 is applied to actuator 24,24 pairs of shaven heads 12 of actuator is applied reduce or at least part of power of eliminating the vibration of shaven head 12.
Such as 52 and 54 indications, playback detects logic 30 operations and is used for open and close switch 22 and 50 respectively.More particularly, when detection logic 30 is determined just in playback, detect logic 30 switch 22 is remained on the make-position, and switch 50 is remained on the open position.On the contrary, when detecting logic 30 definite not playback, detect logic 30 switch 22 is remained on the open position, and switch 50 is remained on the make-position.Therefore, when just in playback, playback servo logic 18 sends to actuator 24 via switch 22 with signal, so that the position of control shaven head 12.On the contrary, when playback not, playback detects logic 30 and via switch 50 signal is sent to actuator 24, so that the position of control shaven head 12.Therefore, logic 30 can increase or reduce the impedance of damping mechanism, in order to stop using respectively or the activation damping mechanism.
In the specific embodiment of the disk drive 110 in being presented at Fig. 2, shaven head 112 comprises attached permanent magnet 113 thereon.Effectively the vibration damping circuit comprises the actuator take inductive coil 124 as form.Therefore, when shaven head 112 and magnet 113 motion, set up moving magnetic field, thereby in coil 124, induce electric current, and/or induce voltage at coil 124 two ends.
The vibration-sensing device is take error amplifier 138 as form, and error amplifier 138 has the input end that is connected with the separately end opposite of coil 124.Therefore, error amplifier 138 monitors the voltage at coil 124 two ends.Coil 124 and error amplifier 138 (similarly, actuator 24 and vibration-sensing device 38) can be united the formation electromagnetic sensor.With the output 146 of amplifier 138 send to take in advance-lag filter 144 is as the vibration abatement device of form.Wave filter 144 can serve as the phase matching circuit, and this phase matching circuit produces the output that is fed back to form with error concealment at circuit 148.In one embodiment, the output on the circuit 148 and the signal on the output terminal 146 differ about 180 degree in phase place.In advance-a particular hardware embodiment of lag filter 144 is operational amplifiers of having incorporated feedback control loop into and having had the resistance that is connected with an input end and the capacitor that is connected with another input end.
Such as 152 and 154 indications, playback detects logical one 30 operations and is used for open and close switch 122 and 150 respectively.When playback detected logical one 30 and determines not playback in the mode similar to the logic 30 of Fig. 1, logical one 30 can make switch 122 remain on the open position, and switch 150 is remained on the make-position.
When switch 150 closures and switch 122 are opened, the feedback of the error concealment on the circuit 148 is imposed on coil 124, thereby cause the voltage at coil 124 two ends and flow through the electric current of coil 124.This electric current that flows through coil 124 has been set up magnet 113, thereby shaven head 112 is applied the magnetic field of electromagnetic induction damping force.Therefore, coil 124 both can be used for the motion of sensing shaven head 112, can cause by it being applied power again the motion of shaven head 112.
On the contrary, when playback detection logical one 30 was determined just in playback, logical one 30 can make switch 122 remain on make-position, and makes switch 150 remain on open position.When switch 122 closures and switch 150 when opening, playback servo logic 118 imposes on coil 124 with signal, thereby causes the voltage at coil 124 two ends and flow through the electric current of coil 124.This electric current that flows through coil 124 has been set up magnet 113, thereby shaven head 112 is applied the magnetic field of electromagnetic force.Similar with the servo logic 18 of Fig. 1, servo logic 118 can receive the information relevant with the focusing of shaven head 112 on the recording medium (not shown).Servo logic 118 can apply voltage and/or electric current to coil 124, in order to improve the focusing of shaven head 112 on recording medium.
Fig. 3 is example is used for the process flow diagram of an embodiment of the inventive method 300 of the shaven head of control recording medium.In first step 302, determine whether the read/write head of disk drive operates.For example, playback detection logic 30 can determine that whether shaven head 12 is just at reading ﹠ recording medium.Alternately, or in addition, can determine current whether recording medium being write of shaven head.If determine that in step S302 shaven head operates, then operation advances to step S304, in step S304, provides better the laser diode 14 with shaven head 12 to focus on adjustment required on the recording medium 16.Such adjustment can by, for example, playback servo logic 18 carries out.On the contrary, if determine that in step S302 shaven head does not operate, then operation advances to step S306, in step S306, provides the required adjustment of vibration of offsetting shaven head 12.For example, coil 124 can sensing shaven head 112 motion, and produce the signal of this motion of indication, error amplifier 138 can amplify this signal, in advance-lag filter 144 can offer this signal coil 124, in order to activate shaven head 112 in the mode of offsetting this motion.No matter whether shaven head just operate under playback mode, in step S308, coil 124 can be used to realize the adjustment of the position of shaven head 124.If just in playback, then servo logic 118 can apply suitable voltage to coil 124.On the contrary, if not playback, then leading-lag filter 144 can apply suitable voltage to coil 124.Whether after coil had been used to realize the adjustment of shaven head, step 302 was returned in operation, reading and/or the operation of write record medium to determine that shaven head is current.
Fig. 4 is when not being benefited from damping action of the present invention, in the situation that shaven head 112 is subject to physical shock, the voltage at coil 124 two ends of Fig. 2 and the exemplary plot of the relation of time.For example, disk drive can be mounted in the form of the compact disk player in the automobile.To the physical shock of shaven head can by, for example, vehicle is run into the hole, hole and is caused.As can be seen from Figure 4, initial peak reaches initial local peaking 402 in the time of about 18 milliseconds from about 16 milliseconds random time, and initial peak finishes in the time of about 20 milliseconds.Therefore, initial peak can reach initial local peaking 402 with certain period of 2 milliseconds of (18 milliseconds-16 milliseconds) orders of magnitude.At shaven head, thereby when the voltage at coil two ends continues vibration, can reach other local peaking 404,406 etc.
In one embodiment, the physical shock that the present invention can damping such as example among Fig. 4, so that when drawing in the ratio of Fig. 4, human eye even do not recognize the impact that vibration stays.More particularly, can be begun to work in several microseconds after initial peak begins by damping provided by the invention.Therefore, in one embodiment, damping response can begin to offset spike in initial peak reaches about per mille (microsecond is to millisecond) of required period of initial local peaking.
Fig. 5 example be used for the embodiment of the inventive method 500 of the shaven head of console panel driver.In first step 502, determine that shaven head is in not mode of operation.For example, playback detects logic 30 can be according to the signal that comes self-controller 34, and whether definite shaven head 12 is being read and/or write record medium 16 effectively.In next step 504, the motion of shaven head when the sensing shaven head does not operate.In one embodiment, after playback detection logical one 30 determined that shaven head 112 is not reading or writing, error amplifier 138 came the motion of sensing shaven head 112 by the voltage at sensing coil 124 two ends.Alternately, as following embodiment for Fig. 7 discuss like that, be applied to power on the shaven head motion of shaven head (rather than during bare headed the operation) when coming the sensing shaven head not operate by effective vibration damping circuit.Then, in step 506, to the sensing of shaven head, shaven head is not applied the damping electromagnetic force when operating in response to shaven head.For example, after error amplifier 138 senses the motion of shaven head 112, by error amplifier 138 signal 146 is sent in advance-lag filter 144.In response to receiving signal 146, leading-lag filter 144 can apply voltage to coil 124.The caused electric current that flows through coil 124 can be set up magnet 113, thereby applies the electromagnetic field of damping electromagnetic force to being attached to shaven head on the magnet 113.
Among Fig. 6 example be used for the embodiment of the inventive method 600 of the shaven head of control recording medium.In first step 602, determine that shaven head is in not mode of operation.For example, playback detection logical one 30 can determine whether shaven head 112 is being read and/or the write record medium effectively.Logical one 30 can the detection record medium not playback.In one embodiment, logical one 30 can the sensing spindle drive motor current drawn not, and can determine that therefore shaven head 112 is in not mode of operation.In next step 604, be in not mode of operation in response to definite shaven head and activate damping mechanism.Specifically, after determining that shaven head 112 is in not mode of operation, detect logical one 30 and can make switch 122 stay open state, and switch 150 is kept closed.When switch 150 closure, can activate the damping mechanism that comprises error amplifier 138 and leading-lag filter 144.Then, in step 606, the motion of shaven head when the sensing shaven head does not operate.In one embodiment, error amplifier 138 comes the motion of sensing shaven head 112 by the voltage at sensing coil 124 two ends.Alternately, as following embodiment for Fig. 7 discusses, be applied to the power on the shaven head when coming the sensing shaven head not operate by effective vibration damping circuit.In step 608, in response to the sensing to optical movement, use damping mechanism that shaven head is applied power, thus damped motion, the size of power depends on the parameter of motion.For example, after error amplifier 138 sensed the motion of shaven head 112, error amplifier 138 sent to signal 146 in advance-lag filter 144.In response to receiving signal 146, leading-lag filter 144 applies voltage to coil 124.The caused electric current that flows through coil 124 can be set up magnet 113, thereby applies the electromagnetic field of damping electromagnetic force to being attached to shaven head on the magnet 113.
The amplitude of the signal on the circuit 148 can depend on the parameter of motion.In one embodiment, described parameter is the form of the movement velocity of shaven head 112.Movement velocity is larger, and the amplitude of the voltage that 124 pairs of error amplifiers 138 of coil apply is just larger.Successively, the amplitude of the voltage that error amplifier 138 is applied is larger, and amplifying signal 146 is just larger, and it is just larger to impose on the signal of coil 124 at circuit 148.In addition, the signal that imposes on coil 124 is larger, flows through the electromagnetic field that the electric current of coil sets up just larger, and the power that is applied on the shaven head 112 is just larger.Therefore, the size that is applied to the damping force of shaven head on 112 can depend on the bare headed speed of initial measurement.
In order to simplify example, thereby the initial electromagnetic field of the induction in coil 124 that causes with initial motion by shaven head and initial current are general dividually the damping current that flows through coil 124 and the damping electromagnetic field of setting up described here.Yet, should be understood that vibration damping circuit of the present invention can be used for eliminating initial electromagnetic field and the initial current of being responded at coil 124 by the motion of shaven head.On the contrary, electromagnetic field and the electric current responded in coil 124 by the vibration damping circuit can be eliminated by the initial electromagnetic field of being responded in coil 124 by the motion of shaven head and initial current.
In the alternate embodiments of the disk drive 710 in being presented at Fig. 7, shaven head 712 comprises attached permanent magnet 713 thereon.Shaven head 712 is hung by one or more suspension line, figure 7 illustrates such line 756.Effectively the vibration damping circuit comprises semiconductor strain gauge or the piezoresistance 758 that is connected with line 756.If shaven head 712 carries out any motion, then the resistance of piezoresistance 758 can correspondingly change.The stretching of the motion that therefore, piezoresistance 758 can sensing shaven head 712 and the line 756 that causes.In one embodiment, piezoresistance 758 is the parts that comprise the voltage divider of resistance 760 and voltage source 762.Because the resistance of piezoresistance 758 changes with shaven head 712 motions, the voltage that puts on the input end of error amplifier 738 correspondingly changes.Therefore, sense bare headed 712 suffered any vibration or impacts.
With the output 746 of amplifier 738 send to in advance-the vibration abatement device of the form of lag filter 744.Wave filter 744 can serve as the phase matching circuit, the output that this phase matching circuit produces the form of feeding back with error concealment at circuit 748.In one embodiment, the output on the circuit 748 and the signal on the output terminal 746 differ about 180 degree in phase place.In advance-a particular hardware embodiment of lag filter 744 is operational amplifiers of having incorporated feedback control loop into and having had the resistance that is connected with an input end and the capacitor that is connected with another input end.
Such as 752 and 754 indications, playback detects logic 730 operations and is used for open and close switch 722 and 750 respectively.When playback detected logic 730 and determines not playback in the mode similar to the logic 30 of Fig. 1, logic 730 can make switch 722 remain on the open position, and switch 750 is remained on the make-position.
When switch 750 closures and switch 722 when opening, apply error concealment feedback on the circuit 748 to coil 724, thereby cause the voltage at coil 724 two ends and/or flow through the electric current of coil 724.This electric current that flows through coil 724 is set up magnet 713, thereby shaven head 712 is applied the magnetic field of electromagnetic force.Therefore, coil 724 can be used for causing by it being applied power the motion of shaven head 712.
On the contrary, when playback detection logic 730 was determined just in playback, logic 730 can make switch 722 remain on the make-position, and switch 750 is remained on the open position.When switch 722 closures and switch 750 when opening, 718 pairs of coils 724 of playback servo logic apply signal, thereby cause the voltage at coil 724 two ends and/or flow through the electric current of coil 724.This electric current that flows through coil 724 is set up magnet 713, thereby shaven head 712 is applied the magnetic field of electromagnetic force.Similar with the servo logic 18 of Fig. 1, servo logic 718 can receive the information relevant with the focusing of shaven head 712 on recording medium 716.Servo logic 718 can be applied to voltage the two ends of coil 724 and/or electric current is put on coil 724, in order to improve the focusing of laser diode 714 on recording medium 716 of shaven head 712.
Controller 34 is described as to detecting logic 30 herein and points out when carry out playback.In another embodiment (not shown), independent circuit automatically detects machinery or electric phenomenon or the event that characterizes the light media playback.For example, this circuit can detect the electric current that spindle motor is drawn from power supply.This circuit can gauge tap 22,50.
Playback of the present invention is detected example logic herein and become the open and close switch, in order to can enable or forbid effective vibration damping circuit.Yet, should be understood that to exist within the scope of the invention other to make playback detect the mode that effective vibration damping circuit was enabled or forbidden to logic.For example, detect logic and can realize switch via electromechanical relay or electronic switching device.Can be by change the impedance of damping mechanism with electronic switching device, in order to activate or inactive damping mechanism.As another kind of alternative, error amplifier and leading-lag filter can be designed on demand the normal playback tracking circuit is presented Low ESR (vibration damping selection/vibration damping is effective) characteristic or high impedance (vibration damping do not select/vibration damping is invalid) characteristic.
Switch 50,150 is shown as herein and is arranged in the circuit 48,148.Yet, should be understood that alternately, these switches can be arranged in before the vibration-sensing or just in time after vibration-sensing.For example, switch 50 can be arranged in circuit 40,42 and 46 any one on.In addition, switch 150 can be arranged in the input end of error amplifier 138, or is arranged between error amplifier 138 and the leading-lag filter 144.Therefore, switch 50,150 can be used to activation and inactive vibration-sensing and vibration and eliminate both.
The present invention is described as herein and is mainly used in the read/write head that is installed in such as in the vehicle of automobile.Yet, should be understood that the present invention also can be applied to shaven head usually without undergoing any other read/write head type or the read/write head device that vibrate, such as the device in dwelling house or the office environment.
Have exemplary design although the present invention is described as, can in spirit and scope of the present disclosure, do further modification to the present invention.Therefore, the application is intended to contain of the present invention any variation, use or the reorganization of using its general principle.In addition, the application be intended to contain such under the present invention in the technology known or habitual the of the present disclosure of practice depart from.
Claims (20)
1. a control is used for the method for the shaven head (12) of recording medium (16), comprises following steps:
Determine that described shaven head is in not mode of operation;
Activate damping mechanism in response to described determining step;
The motion of described shaven head when the described shaven head of sensing does not operate; And
The motion of described shaven head when sensing described shaven head and do not operate, thereby the motion of described shaven head when using described damping mechanism that described shaven head is applied the described shaven head of power damping and do not operate, the size of described power depends on the parameter of described motion.
2. the method for claim 1, wherein described determining step comprises: detect the not playback of described recording medium.
3. the method for claim 1, wherein described determining step comprises: determine that described shaven head had not both read described recording medium and described recording medium do not write yet.
4. the method for claim 1, wherein described activation step comprises: reduce the impedance of described damping mechanism.
5. the method for claim 1, wherein described sensing step comprises: monitor the voltage that electromagnetic induction that the motion by described shaven head causes causes.
6. the method for claim 1, wherein described use step comprises: apply electromagnetic force to described shaven head.
7. the method for claim 1, wherein, described motion comprises: comprise the vibratory movement of a plurality of local peakings (402,404,406), described shaven head is applied power, so that reach the described motion of before damping of initial spike (402) in the described peak value at described shaven head.
8. method that is used for the shaven head (12) of console panel driver (10) comprises following steps:
Determine that described shaven head is in not mode of operation;
Be applied at least one in the power on the described shaven head when motion of described shaven head and described shaven head did not operate when the described shaven head of sensing did not operate; And
Be applied at least one in the power on the described shaven head when motion of described shaven head and described shaven head do not operate when sensing described shaven head and do not operate, thus the motion of described shaven head when applying the described shaven head of damping electromagnetic force damping and do not operate to described shaven head.
9. method as claimed in claim 8 comprises the further step that activates damping mechanism in response to described determining step, and the described step that applies comprises: apply described damping electromagnetic force with described damping mechanism.
10. method as claimed in claim 9, wherein, described activation step comprises: reduce the impedance of described damping mechanism and at least one in the activator switch device (50).
11. method as claimed in claim 8, wherein, described sensing step comprises: monitor the voltage that electromagnetic induction that the motion by described shaven head causes causes.
12. method as claimed in claim 8, wherein, described motion comprises the sinusoidal motion that comprises a plurality of peak values (402,404,406), and described shaven head is applied power, so that reach the described motion of before damping of initial spike (402) in the described peak value at described shaven head.
13. method as claimed in claim 8, wherein, described determining step comprises: detect the not playback of the dish in the described disk drive.
14. method as claimed in claim 8, wherein, described determining step comprises: determine that described shaven head did not both read the dish in the described disk drive, did not write the dish in the described disk drive yet.
15. a disk drive (10) comprises:
Shaven head (12);
Sensor (24,38) is applied at least one in the power on the described shaven head when motion of described shaven head and described shaven head do not operate when being configured to the described shaven head of sensing and not operating;
Damping unit (44,50), couple with described sensor, and be applied in the power on the described shaven head at least one when the motion of described shaven head and described shaven head do not operate when being configured to sense described shaven head and do not operate in response to described sensor, thereby the motion of described shaven head when described shaven head applied the described shaven head of damping force damping and do not operate; And
Controller (30) couples with in described sensor and the described damping unit at least one, and is configured to when described shaven head is in mode of operation, at least one in stop using described sensor and the described damping unit.
16. disk drive as claimed in claim 15, wherein, described sensor comprises the electromagnetic sensor that is configured to the sensing electromagnetic induction voltage.
17. disk drive as claimed in claim 15, wherein, described damping unit is configured to apply the electromagnetic induction damping force to described shaven head.
18. disk drive as claimed in claim 15, wherein, described controller is configured to:
Detect and be in the event that mode of operation is associated with described shaven head; And
In response to the detection of described event, at least one in stop using described sensor and the described damping unit.
19. disk drive as claimed in claim 15, wherein, described sensor comprises and is configured to conduct in response to the motion of described shaven head the faradic coil of inductance.
20. disk drive as claimed in claim 15, wherein, described sensor comprises piezoresistance (758).
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/US2008/001464 WO2009099406A1 (en) | 2008-02-04 | 2008-02-04 | Method and apparatus for vibration damping of a suspended media read/write head |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101849259A CN101849259A (en) | 2010-09-29 |
| CN101849259B true CN101849259B (en) | 2013-01-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN200880114559.XA Expired - Fee Related CN101849259B (en) | 2008-02-04 | 2008-02-04 | Method and apparatus for vibration damping of a suspended media read/write head |
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| Country | Link |
|---|---|
| EP (1) | EP2248125A4 (en) |
| JP (1) | JP2011511393A (en) |
| KR (1) | KR101484532B1 (en) |
| CN (1) | CN101849259B (en) |
| WO (1) | WO2009099406A1 (en) |
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| KR200495750Y1 (en) | 2021-07-12 | 2022-08-10 | 손서용 | Turner for Cooking |
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- 2008-02-04 JP JP2010544934A patent/JP2011511393A/en active Pending
- 2008-02-04 KR KR1020107014108A patent/KR101484532B1/en not_active IP Right Cessation
- 2008-02-04 EP EP08725141A patent/EP2248125A4/en not_active Withdrawn
- 2008-02-04 CN CN200880114559.XA patent/CN101849259B/en not_active Expired - Fee Related
- 2008-02-04 WO PCT/US2008/001464 patent/WO2009099406A1/en active Application Filing
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| CN1286464A (en) * | 1999-08-27 | 2001-03-07 | 株式会社三协精机制作所 | Light sensor |
| CN1434447A (en) * | 2003-02-28 | 2003-08-06 | 彭东波 | Clamp head type optical drive capable of automatic loading-unloading CD |
Also Published As
| Publication number | Publication date |
|---|---|
| KR20100125222A (en) | 2010-11-30 |
| EP2248125A4 (en) | 2013-03-27 |
| CN101849259A (en) | 2010-09-29 |
| EP2248125A1 (en) | 2010-11-10 |
| JP2011511393A (en) | 2011-04-07 |
| WO2009099406A1 (en) | 2009-08-13 |
| KR101484532B1 (en) | 2015-01-20 |
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