JPH0684221A - Magnetic head device and optical pickup device - Google Patents

Abstract

PURPOSE:To keep the distance (flying height) of a slider to a magnetic disk constant regardless of the radial position on the disk. CONSTITUTION:An angle detection circuit 21 detects the rotating angle of a head arm and an angle/voltage conversion circuit 22 impresses a voltage corresponding to the angle, namely, a voltage to be gradually increased toward the outer peripheral side through a driver 23 to a piezoelectric element 12. Consequently, the thickness of the piezoelectric element 12 is changed, and the angle of wing member 11 to a slider 10 is changed so as to be enlarged gradually toward the outer peripheral side. Thus, big lifting force is generated with the move of the slider 10 to the outer peripheral side, and the slider 10 floats up at the flying height where this lifting force is balanced with the buoyancy of the slider 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head device and an optical pickup device, and more particularly to a magnetic head device for a magnetic disk device and an optical pickup device for a magneto-optical disk device.

[0002]

2. Description of the Related Art In a magnetic disk device, a flying head type magnetic head device is used to keep a constant distance between a recording layer on which data of a magnetic disk is recorded and a so-called slider. This is because when the disk rotates, buoyancy (dynamic pressure) is generated by the air being pushed into the wedge-shaped gap formed by the temper flat slider and the disk surface that form the magnetic head device, and this and the slider. The flying height is such that the load applied by the head arm supporting the slider is balanced, and the slider floats.

[0003]

By the way, when the disc is rotated at a constant angular velocity (CAV), the air flow speeds are different between the inner circumference side and the outer circumference side of the disk, and the flying height is different between the inner circumference side and the outer circumference side. There was the problem of being different.

On the other hand, data is recorded on the magneto-optical disk,
Further, in an optical pickup device for reproducing recorded data, when recording data, a magnetic head device for applying a modulation magnetic field modulated based on the data to a recording surface irradiated with a beam spot is used. It was required at the positions facing each other with the magneto-optical disk in between, and was a barrier to the miniaturization of the device. Therefore, it is conceivable to dispose a coil for applying the modulation magnetic field on the objective lens side. In this case as well, in order to apply the modulation magnetic field in addition to the focusing actuator that controls the objective lens to the in-focus position. There is a problem in that the mechanism becomes complicated because a means for keeping the distance between the coil and the recording surface constant is required.

The present invention has been made in view of the above circumstances, and a magnetic head capable of maintaining a constant distance between a slider and a disk that is rotationally driven at a constant angular velocity regardless of the radial position of the slider. It is an object of the present invention to provide an optical pickup device and an optical pickup device capable of keeping a constant distance between an objective lens and a coil and a magneto-optical disk with a simple mechanism.

[0006]

In order to solve the above-mentioned problems, a magnetic head device according to the present invention comprises position detecting means for detecting the radial position of a slider on a disk, and one end of the slider rotates. A wing member that is freely attached and that makes the distance of the slider variable with respect to the disk; and a control unit that controls the inclination of the wing member with respect to the slider based on position information from the position detection unit. To do.

In order to solve the above-mentioned problems, an optical pickup device according to the present invention collects light emitted from a laser light source by an objective lens and irradiates it onto a magneto-optical disk.
A focus error signal detecting means for detecting a focus error signal based on the reflected light from the magneto-optical disk, an optical block provided with the objective lens and a coil for applying a modulation magnetic field to the magneto-optical disk, Based on a focus error signal from the focus error signal detection means, a wing member whose one end is rotatably attached to the optical block and which makes the distance of the optical block to the magneto-optical disk variable, and an optical block of the wing member. Control means for controlling the inclination with respect to.

[0008]

In the magnetic head device to which the present invention is applied, the position of the slider in the radial direction on the disk is detected, and the inclination of the blade member with respect to the slider is controlled based on this position information to record the slider and the disk. Keep layer distance constant.

Further, in the optical pickup device to which the present invention is applied, the focus error signal is detected based on the reflected light from the magneto-optical disk, and the tilt of the blade member with respect to the optical block is controlled based on this focus error signal. The distance between the objective lens and the coil and the recording surface of the magneto-optical disk is kept constant.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a magnetic head device and an optical pickup device according to the present invention will be described below with reference to the drawings.

As shown in FIG. 1, for example, the magnetic head device of this embodiment has a coil and a magnetic circuit, one end of which is rotatably attached to a temper flat slider 10, and the slider 10 is attached to the magnetic disk 1. Wing member 11 for varying the distance, and the slider 1 of the wing member 11
A so-called flying head that includes, for example, a piezoelectric element 12 that controls the inclination with respect to 0 and that generates buoyancy (dynamic pressure) by pushing air into a wedge-shaped gap formed by the slider 10 and the surface of the magnetic disk 1. ing.

The slider 10 is attached to the tip of the head arm 15 as shown in FIG.
When the head arm 15 is rotated by the actuator 16, the magnetic disk 1 is rotated in the radial direction.

This magnetic head device is also shown in FIG.
As shown in FIG. 2, an angle detection circuit 21 for detecting the rotation angle of the head arm 15 for detecting the radial position of the slider 10 on the magnetic disk 1, and an angle detection circuit 21 for detecting the rotation angle. An angle voltage conversion circuit 22 that converts an angle into a voltage, and a driver 2 that applies a voltage to the piezoelectric element 12 based on the output of the angle voltage conversion circuit 22.
3 and 3.

The angle detection circuit 21 detects the rotation angle of the head arm 15, and the angle voltage conversion circuit 22 generates a voltage based on this rotation angle. For example, assuming that the innermost circumference is the reference and the rotation angle from that is θ, this angle voltage conversion circuit 22 generates a voltage proportional to the rotation angle θ,
This voltage is supplied to the driver 23.

The driver 23 amplifies this voltage and applies it to the piezoelectric element 12. As a result, the thickness of the piezoelectric element 12 changes, and the inclination of the blade member 11 with respect to the slider 10 changes so as to increase toward the outer peripheral side, and downforce is generated on the slider 10 according to the inclination. Therefore, a large downforce is generated as the slider 10 moves to the outer peripheral side, and this downforce balances with the above-mentioned buoyancy which increases toward the outer peripheral side, and the distance (so-called flying height) of the slider 10 to the magnetic disk 1 is increased. , Regardless of its radial position on the disc
Can be kept constant.

Next, an optical pickup device to which the present invention is applied will be described. This optical pickup device, as shown in FIGS. 3, 4 and 5, supports an objective lens 36 movably in its optical axis direction and moves the objective lens 36 in the radial direction of the magneto-optical disk 2. And a laser light source, a light receiving element, and the like (not shown), and the light emitted from the laser light source is condensed by the objective lens 36 to irradiate the magneto-optical disk 2 to generate the magneto-optical disc. A fixed portion 40 which receives the reflected light from the disk 2 by the light receiving element and detects a focus error signal or the like;
It is provided with a pair of linear motors 50a and 50b for moving the movable portion 30 in the radial direction of the magneto-optical disk 2.
That is, this optical pickup device has a so-called separation optical system in which the optical system is divided into the movable portion 30 and the fixed portion 40 to reduce the weight of the movable portion and shorten the access time. There is.

The movable part 30 has a coil 37 for applying a modulating magnetic field to the objective lens 36 and the magneto-optical disk 2.
And an optical block 31 provided with the optical block 3 and
One end of which is rotatably attached to the optical block 3
1, a wing member 32 for varying the distance to the magneto-optical disk 2, and a piezoelectric element 33 for controlling the inclination of the wing member 32 with respect to the optical block 31 based on the focus error signal detected by the fixed portion 40. , A pair of guide pins 34a, 3 for raising and lowering the optical block 31
It has a carriage 35 to which 4b is attached and a prism 38 for irradiating the light emitted from the fixed portion 40 through the objective lens 36.

The bottom surface of the carriage 35 and the fixed portion 40
On the upper surface of the base 60 that fixes the pair of grooves 39a, 39b, 6 having a substantially V-shaped cross section at opposite positions.
1a and 61b are provided along the radial direction of the magneto-optical disk 2, and are provided between the groove 39a and the groove 61a facing each other and the groove 39a.
By rolling a bearing (not shown) inserted between b and the groove 61b, the movable portion 30 driven by the linear motors 50a and 50b moves smoothly.

That is, the linear motors 50a, 50
b are magnets 51a and 51b and a coil 52, respectively.
a, 52b, and these coils 52a, 52b
And the optical block 31 of the movable part 30 are connected by connecting members 53a and 53b made of, for example, leaf springs.
By passing an electric current through 2a and 52b, the entire movable portion 30 can be moved in the radial direction of the magneto-optical disk 2, and a so-called seek operation can be performed.

Further, the optical block 31 of the movable portion 30.
Is supported by connecting members 53a and 53b formed of leaf springs, so that the objective lens 36 can be moved up and down in the optical axis direction along the guide pins 34a and 34b.

Inside the fixed portion 40, for example, a semiconductor laser, a collimator lens, a beam splitter, a polarization beam splitter, a converging lens, a cylindrical lens, a four-division light receiving element, etc. are arranged, and emitted from the semiconductor laser. The emitted light is collimated by a collimator lens, and then an opening 41 provided in the fixing portion 40.
And is reflected by the prism 38 via. The emitted light reflected by the prism 38 is condensed by the objective lens 36 and applied to the recording surface of the magneto-optical disk 2. Then, on the recording surface of the magneto-optical disk 2, the reflected light whose polarization plane is rotated by the so-called magnetic Kerr effect enters the beam splitter through the opening 41 of the fixed portion 40 through the optical path opposite to the outgoing light. To be done. This beam splitter
The reflected light is separated from the optical path of the emitted light, and the separated reflected light is separated into two components of P-polarized component and S-polarized component by the polarization beam splitter, and the levels of the two separated components are detected by the light receiving element. Each is detected. Then, the data is reproduced based on the levels of the P-polarized component and the S-polarized component.

Further, the focus error signal is detected based on each output of the four-division light receiving element by, for example, the so-called astigmatism method. Then, by applying a voltage based on this focus error signal to the piezoelectric element 33, the inclination of the wing member 32 with respect to the optical block 31 changes, and the buoyancy generated by this wing member 32 and the elastic force of the connecting members 53a, 53b. The movement of the objective lens 36 and the coil 37 is controlled to a position where the force is balanced.

That is, so-called focus servo control is applied, and the movement of the objective lens 36 and the coil 37 can be controlled so that the spot of the laser beam is always imaged on the recording surface of the magneto-optical disk 2. Then, in the state where the focus servo control is performed, at the time of data writing, a modulation magnetic field modulated based on the data is applied to the recording surface by causing a current to flow through the coil 37 based on the data. Data is recorded. In other words, in this optical pickup device, the movement of the objective lens 36 and the coil 37 can be controlled by one mechanism, and the structure can be simplified as compared with the conventional device. In other words, the optical pickup device can be downsized, and the magneto-optical disk device using this optical pickup device can be downsized.

The focus error signal detection method may be another method such as the so-called knife edge method.

[0025]

As is apparent from the above description, in the magnetic head device to which the present invention is applied, the radial position of the slider on the disk is detected, and based on this positional information, the blade member with respect to the slider is detected. By controlling the inclination, the distance (flying height) of the slider to the disk can be kept constant regardless of the position in the radial direction on the disk.

Further, in the optical pickup device to which the present invention is applied, a focus error signal is detected based on the reflected light from the magneto-optical disk, and the tilt of the blade member with respect to the optical block is controlled based on this focus error signal. Thus, the distance between the objective lens and the coil and the recording surface of the magneto-optical disk can be kept constant by one mechanism, and the structure can be simplified as compared with the conventional device. In other words, the optical pickup device can be downsized, and the magneto-optical disk device using this optical pickup device can be downsized.

[Brief description of drawings]

FIG. 1 is a side view showing a configuration of a main part of a magnetic head device to which the present invention is applied.

FIG. 2 is a block diagram for explaining the operation of the magnetic head device.

FIG. 3 is a perspective view showing a configuration of an optical pickup device to which the present invention is applied.

FIG. 4 is a cross-sectional view showing the configuration of the optical pickup device.

FIG. 5 is a vertical cross-sectional view showing the configuration of the optical pickup device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Optical disk 10 ... Slider 11 ... Wing member 12 ... Piezoelectric element

Claims (2)

[Claims] 1. A position detecting means for detecting the radial position of a slider on a disk, a wing member having one end rotatably attached to the slider for varying the distance of the slider with respect to the disk, and the position. A flying head type magnetic head device comprising: control means for controlling the inclination of the wing member with respect to the slider based on the position information from the detection means. 2. Focus error signal detecting means for collecting light emitted from a laser light source by an objective lens, irradiating the light onto a magneto-optical disk, and detecting a focus error signal based on the reflected light from the magneto-optical disk. An optical block in which the objective lens and a coil for applying a modulation magnetic field to the magneto-optical disc are arranged, and one end of which is rotatably attached to the optical block to change the distance of the optical block from the magneto-optical disc. An optical pickup device comprising: a wing member and a control unit that controls an inclination of the wing member with respect to the optical block based on a focus error signal from the focus error signal detection unit.