JPH02223080A - Magnetic head actuator - Google Patents

Abstract

PURPOSE:To attain stable recording by controlling a drive means so as to keep the interval constant based on a value obtained through the detection of an interval between an information recording medium face and a magnetic head. CONSTITUTION:An actuator 5 is driven with a Gap control means with a feedback of a distance between a head core measured by a distance detector 4 and a disk 1 to control the distance to be constant. Since the magnetic head is set not in contact with a recording medium and with a narrow gap, the small sized head with a low inductance and high resonance frequency is used to invert the magnetic field at a high speed and the gap is subject to servo control, then the fluctuation of the magnetic field due to fluctuation of gap is minimized thereby improving the recording characteristic.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a recording/reproducing apparatus using a magneto-optical recording method,
The present invention relates to a magnetic helad actuator that is suitably used as a means for maintaining a constant distance between a magnetic head and a magneto-optical recording medium for writing or rewriting information by modulating a magnetic field.

[Conventional technology]

Conventionally, in a recording/reproducing device using magneto-optical recording method,
In particular, when modulating using a magnetic field, the modulation frequency (reversal time of the magnetic field) is fast, so it is necessary to move the magnetic head as close to the medium as possible.

[Problem to be solved by the invention]

However, with the conventional technology, as shown in Figure 4, when the magneto-optical recording medium is a disk-shaped recording medium, it is dangerous to bring the magnetic head closer than the amplitude of the vibration of the medium due to warpage or surface runout of the disk surface. However, since the self-inductance is required to generate the magnetic field necessary for recording, the reversal speed of the direction of the magnetic flux for modulation is slow, making it impossible to increase the recording frequency. .

〔the purpose〕

The present invention was made in view of the problems of the prior art described above, and its purpose is to eliminate the need for a large distance between the magnetic head and the medium due to surface runout, etc., and to maintain stability by always providing a constant distance. An object of the present invention is to provide a magnetic rad actuator that enables recording.

[Means to solve the problem]

According to the present invention, the above object includes a detection means for detecting the distance between the information recording medium surface and the magnetic spatula r, and a driving means for driving the magnetic head in a direction substantially perpendicular to the information recording medium surface using a piezoelectric element. and a control means for controlling the drive means to keep the distance constant based on the value obtained by the detection means.

〔Example〕

Hereinafter, embodiments of the present invention will be described specifically and in detail based on the drawings.

FIG. 1 is a side view showing an embodiment of the magnetic spatula F actuator of the present invention.

In FIG. 1, numeral 1 denotes a disk which is a magneto-optical recording medium, and numeral 62 denotes an optical head (also an optical pickup) that emits a light beam. 3 is a magnetic head for magnetic field modulation. 4 is an interval detector (its configuration is shown in FIGS. 2(a) and 2(b)) that detects the interval between the disk 1 and the magnetic head 3; and 5 is a sensor for driving the magnetic head 3 in the direction of the interval. This shows an actuator that is a means to do this. The actuator is driven by a piezoelectric element.

Figures 2 (a) and (b) show the herad core and the interval detector 4.
FIG. 2 is a side view showing an example of the configuration.

In FIG. 2(A), 21 is a head with 9 cores.

22 is an electrode for constructing a capacitance displacement meter.

In the fsz diagram (Fig.

23 is a member that holds the core 21 and the displacement gauge.

FIGS. 3(a) and 3(b) are side views showing the actuator of the magnetic head.

In FIG. 3(a), 31 is a magnetic head section.

32 is a holder for the magnetic head. Reference numeral 23 indicates an actuator in which a piezoelectric element has a bimorph structure and is formed into a parallel plate spring shape.

In the above configuration, the gap (Gap) between the head core 21 and the disk 1 measured by the gap detector 4 is fed back, and the actuator 5 is driven by GapCTL as shown in FIG. Control so that it remains constant.

In FIG. 3(b), 34 indicates a leaf spring.

35 is a laminated piezoelectric element, and this piezoelectric element is connected to the plate spring 3.
It expands and contracts in the vertical direction so as to swing the head section provided at the tip of 4. Since the amount of displacement of the laminated piezoelectric element is on the order of several μm, the above configuration achieves the same effect as in the embodiment described above.

〔Effect of the invention〕

As explained above, since the magnetic head can be set without contacting the recording medium and with a narrow gap, it is possible to reverse the magnetic field at high speed using a small head (with low inductance and high resonance frequency). This also makes it possible to realize a high-density magnetic field modulation override type magneto-optical recording device.

Furthermore, since the gap amount is servo-controlled, fluctuations in the magnetic field due to gap fluctuations (that is, fluctuations due to surface runout, etc.) can be extremely reduced, and recording characteristics are improved.

[Brief explanation of the drawing]

Fig. 1 is a side view showing an embodiment of the magnetic helad actuator of the present invention, Fig. 2 (a) * (b) is a side view showing an example of the configuration of the herad core and the spacing detector, and Fig. 3 (a). (b) is a side view showing an actuator of a magnetic head, and FIG. 4 is a side view showing a conventional example. 1... Disk, 2... Optical head, 3... Magnetic head. 4... Interval detector, 5... Actuator. Agent Patent Attorney Heidai Yamashita! Figure Figure Figure (G) (b) Figure

Claims (1)

[Claims] (1) a detecting means for detecting the distance between the information recording medium surface and the magnetic head; a driving means for driving the magnetic head in a direction substantially perpendicular to the information recording medium surface by a piezoelectric element; a control means for controlling the drive means to keep the distance constant based on the value determined by the magnetic head actuator.