JPH06309822A - Record reproducing head and record reproducer using this head - Google Patents

Abstract

PURPOSE:To position a record reproducing head highly precisely by letting positional information read out from an information recording medium by a transducer part of the head to be fed back to an actuator part provided in the head and driving the transducer part directly in relation to a suspension part. CONSTITUTION:Positional information read out by a transducer part 3 from a magnetic disk not shown in the figure is fed back to a driving coil of an actuator part 5 and a voice coil motor is driven on the basis of this information. In other words, the transducer part 3 is displaced minutely in the direction of a track of the disk and, thereby, a head is positioned highly precisely. In this way, it is made possible to drive the transducer part 3 directly in relation to a suspension part 2 by the actuator part 5. Even when a resonance point is present in a servo band due to the existence of a spring element such as a ginbal part 4 in some part of components, a feedback system is made stable, the servo band is made high and a large feedback gain is obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a recording / reproducing head for reading / writing information on an information recording medium, and a positioning servo system using position information previously written on the information recording medium. The present invention relates to a recording / reproducing device that positions a reproducing head.

[0002]

2. Description of the Related Art As an example of a conventional recording / reproducing apparatus, a Winchester type magnetic disk apparatus will be described here. FIG. 9 is a schematic plan view of a magnetic head used in a conventional Winchester type magnetic disk device and its A-.
The A arrow view is shown. The magnetic head 101 includes a suspension portion 102, a transducer portion 103 including a transducer on a head slider, and a gimbal portion 104 that elastically attaches the transducer portion 103. The magnetic head 101 is attached to the mounting portion 1
It is fixed to an actuator arm (not shown) via 05.

In the conventional magnetic disk device, a positioning servo system for feeding back the position information read from the magnetic disk by the transducer unit 103 of the magnetic head 101 to an actuator (not shown) is constructed. Moving and positioning.

However, in the conventional magnetic head 101, since the resonance frequency is 2 to 3 kHz, the servo band is about 400 Hz at most, and its positioning accuracy is about submicron. On the other hand, in order to further increase the recording density of the magnetic disk device, more accurate positioning characteristics are required. However, it is difficult to meet the demand with the conventional magnetic head structure.

[0005]

As described above,
In the conventional recording / reproducing apparatus, the positioning accuracy of the recording / reproducing head is on the order of submicron, and there is a drawback that it is difficult to further increase the recording density of the recording / reproducing apparatus.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a recording / reproducing head capable of overcoming the above drawbacks and greatly improving the positioning accuracy, and a recording / reproducing apparatus using the same.

[0007]

In order to achieve the above object, according to the present invention, a transducer section for reading and writing information on an information recording medium, an elastic member for elastically attaching the transducer section, and Provided is a recording / reproducing head having a suspension part to which an elastic member is attached, and a drive means for driving the transducer part with respect to the suspension part, and a position written in advance on an information recording medium. In a recording / reproducing apparatus for positioning a recording / reproducing head by forming a positioning servo system using information, a transducer section for reading / writing information on an information recording medium and an elastic member for elastically attaching the transducer section. And the suspension part to which this elastic member is attached and the transducer part in front. A first driving means for driving with respect to the suspension portion, an arm for attaching the suspension unit, a second for driving the arm to move the recording head to a predetermined position on said information recording medium
The present invention also provides a recording / reproducing apparatus characterized in that the recording / reproducing apparatus is provided.

[0008]

According to the present invention, the position information read from the information recording medium by the transducer section of the recording / reproducing head is fed back to the actuator section provided in the recording / reproducing head, so that the transducer section is moved to the suspension section. By directly driving, the recording / reproducing head can be positioned with high accuracy.

Further, in the recording / reproducing apparatus using the recording / reproducing head according to the present invention, the actuator portion for driving the arm to which the recording / reproducing head is mounted positions the transducer portion with a relatively coarse positioning error, and the recording is performed. By directly driving the transducer part with the actuator provided in the reproducing head, precise positioning is performed with a minute positioning error, and the transducer part of the recording / reproducing head can be accurately positioned at a predetermined position on the information recording medium as a whole. It becomes possible to position.

[0010]

Embodiments of the present invention will be described in detail with reference to the drawings. A Winchester-type magnetic disk device will be described here as an example of the recording / reproducing device, but the present invention is not limited to this case, and, for example, an optical disk device having a flying optical head using a head slider, or the like. It can also be applied to a recording / reproducing device.

FIG. 1 is a schematic plan view showing a first embodiment of a magnetic head, which is a recording / reproducing head according to the present invention, and an AA arrow view thereof. The magnetic head 1 includes a suspension part 2, a transducer part 3 including a transducer on a head slider, a gimbal part 4 to which the transducer part 3 is attached, and an actuator part 5 for driving the transducer part 3. There is.
A damping member 6 is arranged between the suspension portion 2 and the gimbal portion 4 to which the transducer portion 3 is attached. Here, the damping member 6 is a viscoelastic body, and is provided to suppress the resonance peak formed by the gimbal portion 4 and the transducer portion 3. This allows
The vibration of the transducer unit 4 can be suppressed even when disturbance vibration or the like is introduced. The magnetic head 1 is fixed to an arm (not shown) via the mounting portion 7.

FIG. 2 shows details of the actuator section 5 for driving the transducer section 3,
It corresponds to the BB cross-sectional view of the schematic plan view in FIG. 1. The actuator section 5 is composed of a voice coil motor including a drive coil 8 provided at an end of the metal thin plate 4c forming the gimbal section 4 and a magnetic circuit 9 arranged so as to sandwich the drive coil 8. Here, the magnetic circuit 9
Is composed of a first yoke 11 to which the magnet 10 is attached and which is arranged on the suspension portion 2, and a second yoke 12 which is attached to the gimbal portion 4.

The magnetic head 1 having the above structure
Has the following effects. First, the transducer unit 3 feeds back position information read from a magnetic disk, which is an information recording medium (not shown), to the drive coil 8 of the actuator unit 5, and the voice coil motor is driven based on this information. It And
By slightly displacing the transducer unit 3 in the track direction of the magnetic disk, the magnetic head can be positioned with high accuracy. Since the actuator unit 5 directly drives the transducer unit 3 with respect to the suspension unit 2, even if there is a spring element such as the gimbal unit 4 in this embodiment somewhere in the constituent elements and a resonance point exists in the servo band, feedback is performed. The system does not easily become unstable. Therefore, it is possible to increase the servo band and obtain a large feedback gain, and it is possible to realize highly accurate positioning. Further, since the actuator unit 5 is of the electrokinetic type, a relatively large stroke and generated force can be obtained, and even if a large disturbance is entered, it is difficult to deviate from the feedback loop, and it is possible to maintain highly accurate positioning characteristics. Is.

By the way, the transducer unit 3 magnetically reads the signal, and the magnetic field generated by the drive current of the drive coil 8 may increase noise contained in the signal. However, most of the magnetic field generated by the drive current flows through the magnetic circuit 9, and the frequency of the signal handled by the transducer unit 3 is as high as MHz, whereas the frequency of the magnetic field due to the drive current is as low as about kHz. , The effect of noise can be ignored by filtering the position information signal.
However, when high frequency components cannot be ignored due to PWM (Pulse Width Modulation) driving or the like, it is necessary to magnetically shield the periphery of the transducer unit 4.

FIG. 3 is a schematic plan view showing a second embodiment of a magnetic head which is a recording / reproducing head according to the present invention and its AA arrow view, and FIG. 4 is its BB sectional view. Is. Here, the same parts or parts having the same functions as those shown in FIG.

In this embodiment, the transducer portion 3 is modified by improving the gimbal portion 4 of the first embodiment.
It is designed to make the driving of the device smoother. The details of the gimbal portion 4 in this embodiment are shown in FIG. A drive coil 8 constituting an actuator unit 5 is arranged at an end of the metal thin plate 4c to which the transducer unit 3 is attached, and the metal thin plates 4a and 4a are provided on both sides of the metal thin plate 4c.
4b are provided, which form parallel leaf springs.
According to this structure, when the transducer section 3 is driven by the action of the actuator section 5, the thin metal plates 4a and 4b of the gimbal section 4 become movable sections, and smooth driving is realized.

FIG. 6 shows another embodiment of the actuator section 5. This embodiment has a structure in which sheet-shaped piezoelectric elements 30a and 30b are mounted on the metal thin plates 4a and 4b forming the parallel leaf springs of the gimbal portion 4 shown in FIG. According to this configuration, the piezoelectric element 3
By controlling the voltage supplied to 0a and 30b, the transducer part 3 can be directly driven with respect to the suspension part 2 by using this part as a movable part as in the above embodiment.

In addition, the actuator section 5 may be configured to directly drive the transducer section 3 in a non-contact manner by applying an electrostatic force or a magnetic force. The features of the recording / reproducing head according to the present invention are summarized as follows. First, the transducer unit 3 can be directly driven with respect to the suspension unit 2 by the action of the actuator unit 5, and the transducer unit 3 can be positioned with high accuracy on the information recording medium. Further, even when the actuator section 5 is provided on the gimbal section 4 that connects the transducer section 3 and the suspension section 2, by devising such that the original function of the gimbal section 4 is not impaired, the transducer section at the time of recording / reproducing is reproduced. It is possible to maintain the levitation characteristic of No. 3.

Next, the operation of the magnetic disk device using the above-mentioned magnetic head 1 will be described as an example of the recording / reproducing device according to the present invention. FIG. 7 shows an outline of an actuator system in one embodiment of the magnetic disk device according to the present invention. It should be noted that each part of the magnetic head 1 is given the same number as in FIG.

Here, the actuator portion 13 is composed of a drive coil 14, a magnet 16 and a yoke 17 which form a magnetic circuit 15, an arm 18 and a rotary shaft 19 which rotatably supports the arm 18. The magnetic head 1 described above is attached to the arm 18. Also, the rotary shaft 19
The pivot part 20 provided with a bearing for supporting is fixed on a frame (not shown).

For convenience of explanation, the actuator portion 5 provided in the magnetic head 1 will be referred to as a first actuator 21 and the above-mentioned actuator portion 13 will be referred to as a second actuator 22.

The position information read from the magnetic disk 23 by the transducer unit 3 of the magnetic head 1 is fed back to the drive coils 8 and 14 of the first actuator 21 and the second actuator 22, and the transducer unit 3 is driven. Position with high accuracy. here,
The second actuator 22 has a large stroke capable of moving the magnetic head 1 in the radial direction of the magnetic disk 23, and has a relatively low resonance frequency. On the other hand, since the first actuator 21 only needs to have a stroke corresponding to a minute displacement, the entire size can be greatly reduced,
The resonant frequency can also be significantly increased. In the magnetic disk device according to this embodiment, a positioning servo system in which the above-described first and second actuators 21 and 22 cooperate with each other is configured, and a large amplitude movement is performed by the second actuator 22, and a small amplitude movement is performed. The first actuator 21 will be in charge of each.

FIG. 8 is a block diagram showing an outline of the positioning servo system of the magnetic head. The position information Xt written on the magnetic disk which is the information recording medium is read by the transducer unit of the magnetic head and converted into a position error signal by the feedback circuit 24. When the position error signal is viewed in the frequency domain, the low frequency one has a large amplitude and the high frequency one has a small amplitude. Therefore, the position error signal is divided into high and low frequencies, and the high frequency component is divided into the first actuator 21.
The low frequency components are fed back to the second actuator 22.

That is, in FIG. 8, the position error signal in which the low frequency component is cut by the first compensating circuit 25 including the low cut filter section is sent to the first actuator 21, and is parallel to the first compensating circuit 25. The position error signal from which the high frequency component has been cut by the second compensating circuit 26 including the high cut filter unit provided is the second actuator 22.
And the position information Xh of the magnetic head is obtained by the cooperation of the two actuators 21 and 22.

As described above, the first and second actuators 21 and 22 described above cooperate with each other to move the second actuator 22.
Positions with a relatively coarse positioning error,
Since the first actuator 21 performs precise positioning with a minute positioning error, it is possible to perform highly accurate positioning as a whole.

Since the high cut filter section is included in the loop of the signal entering the second actuator 22, it is possible to prevent the control of the second actuator 22 from becoming unstable.

The feedback circuit 24 is a CPU
It is also possible to use a digital configuration such as. In this case, the logic corresponding to the high cut filter unit in the second compensation circuit 26 does not need to be provided in particular, and the signal is thinned out to the second
It is possible to cut the high frequency component simply by sending it to the actuator 22. However, the signal in this case is
Although a slight noise component will be included, this noise component can be sufficiently compensated by the first actuator 21.

As described above, in the recording / reproducing apparatus according to the present invention, by using the recording / reproducing head according to the present invention, highly accurate positioning of the transducer section on the information recording medium is realized. The recording density of the medium in the track direction can be increased, and the device can be downsized and the capacity can be increased.

[0029]

As described above, according to the present invention,
Since the transducer portion of the recording / reproducing head can be moved with respect to the suspension portion, it is possible to construct a recording / reproducing head capable of positioning the transducer portion with high accuracy on the information recording medium.
Further, by using the recording / reproducing head according to the present invention, high density recording is possible, and a small-sized and large-capacity recording / reproducing apparatus can be provided.

[Brief description of drawings]

FIG. 1 is a diagram showing a first embodiment of a recording / reproducing head according to the present invention.

FIG. 2 is a detailed view of an actuator section for driving the transducer section of the first embodiment.

FIG. 3 is a diagram showing a second embodiment of the recording / reproducing head according to the present invention.

FIG. 4 is a detailed view of an actuator section for driving the transducer section of the second embodiment.

FIG. 5 is a detailed view of a gimbal portion in the second embodiment of the recording / reproducing head according to the present invention.

FIG. 6 is a diagram showing another embodiment of an actuator section for driving a transducer.

FIG. 7 is a schematic diagram of an actuator system in an embodiment of a recording / reproducing apparatus according to the present invention.

FIG. 8 is a schematic diagram of a positioning servo system of a recording / reproducing head.

FIG. 9 is a schematic diagram of a conventional recording / reproducing head.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 magnetic head (recording / reproducing head) 2 suspension part 3 transducer part 4 gimbal part (elastic member) 5,13 actuator part (driving means) 6 damping member 7 mounting part 8,14 drive coil 9,15 magnetic circuit 10,16 magnet Reference Signs List 11 first yoke 12 second yoke 17 yoke 18 arm 19 rotating shaft 20 pivot portion 21 first actuator (first driving means) 22 second actuator (second driving means) 23 magnetic disk (information recording medium) 24 feedback Circuit 25 First Compensation Circuit 26 Second Compensation Circuit

Claims (2)

[Claims] 1. A transducer section for reading and writing information on an information recording medium, an elastic member for elastically attaching the transducer section, a suspension section for attaching the elastic member, and the transducer section for the suspension. A recording / reproducing head comprising: a driving unit that drives the unit. 2. A transducer for reading / writing information on an information recording medium in a recording / reproducing apparatus for positioning a recording / reproducing head by constructing a positioning servo system using position information previously written on the information recording medium. Section, an elastic member for elastically attaching the transducer section, a suspension section for attaching the elastic member, a first drive means for driving the transducer section with respect to the suspension section, and the suspension section. A recording / reproducing apparatus comprising: an arm for attaching the same; and a second driving unit for driving the arm to move the transducer section to a predetermined position on the information recording medium.