JPH04103322U - magnetic head device - Google Patents

Abstract

(57) [Summary] [Purpose] To generate the high-speed strong magnetic field required by magneto-optical disk devices with low drive voltage or low drive current. [Structure] A plurality of coils 4 and 5 are wound in the same direction around a core 3 constituting a magnetic head 1, and the plurality of coils 4 and 5 are connected in parallel to each other and connected to a common drive amplifier 6, or
A plurality of coils 4, 5 are independently connected to a plurality of drive amplifiers.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to a magnetic head device suitable for a magneto-optical disk drive.

0002

[Conventional technology]

A high speed, strong magnetic field is required when recording signals in a magneto-optical disk device. conventionally In order to meet this demand, the number of turns of the magnetic head coil must be increased or the current increased.

0003

[Problem that the idea aims to solve]

By the way, when increasing the number of turns of the coil or increasing the current, the driving It is necessary to increase the voltage, and circuit elements with high withstand voltage or large current are required. Therefore, the cost of the device has increased.

0004 Therefore, the purpose of the present invention is to reduce the voltage of the drive circuit or to provide a magnetic head that can reduce the voltage. The goal is to provide equipment.

[0005]

[Means to solve the problem]

In order to achieve the above object, the present invention includes a magnetic core having a gap, and a magnetic core having an air gap. a plurality of coils wound around the core in the same direction and connected in parallel to each other; The present invention relates to a magnetic head device including a common drive circuit for the coils.

[0006]

[Effect]

Since multiple coils generate magnetic flux in the same direction in the magnetic core, the sum of these magnetic fluxes A bunch is obtained. Reducing the number of turns in each coil to obtain the same magnetic flux as before Therefore, the drive voltage can be lowered by this amount.

[0007]

[First example] Next, a magnetic head device according to a first embodiment will be explained with reference to FIG. magnetic The head 1 includes an annular magnetic core 3 having a gap 2, and a magnetic core 3 having a gap 2 therein. It consists of wound first and second coils 4 and 5. first and second coils 4; 5 are wound in the same direction around the core 3 so as to generate magnetic flux in the same direction. .

[0008] The first and second coils 4 and 5 are connected in parallel to each other, and one end of the coils is connected to the drive circuit. The other end of the drive amplifier 6 is connected to the ground. Increased drive A signal source 7 is connected to the input terminal of the width converter 6 .

[0009]

【motion】

The signal from the signal source 7 is amplified by the drive amplifier 6 and supplied to the first and second coils 4 and 5. be provided. The first and second coils 4 and 5 having inductance have drive amplification. A current corresponding to the output voltage of the device 6 flows. The first and second coils 4 and 5 are the core 3 are wound in the same direction, so when current flows in the same direction, magnetic flux in the same direction occurs. The magnetic flux of the core 3 is generated by the first and second coils 4 and 5. It becomes the sum of the bunch. Therefore, it becomes possible to obtain a strong magnetic field with a low driving voltage.

0010

[Second example] Next, a magnetic head device according to a second embodiment of the present invention will be described with reference to FIG. However In FIG. 2, parts common to those in FIG. Ru.

[0011] In FIG. 2, the first and second coils 4, 5 are not connected in parallel with each other, and the first and second coils 4, 5 are not connected in parallel with each other. It is connected to a signal source 7 via drive amplifiers 6a and 6b.

0012 Since the first and second drive amplifiers 6a, 6b are connected to a common signal source 7, , supplies substantially the same drive voltage to the first and second coils 4,5. 1st and The second coils 4 and 5 are wound in the same direction, so they are the same as in the case of Figure 1. Generate magnetic flux in the direction. In this embodiment, the first and second drive amplifiers 6a, 6b are The current can be halved compared to FIG.

[0013]

[Modified example]

The present invention is not limited to the embodiments described above, but can be modified. for example , the coil can be divided into three or more.

[0014]

[Effect of the idea]

As is clear from the above, according to the present invention, the drive voltage can be reduced or the drive voltage and drive voltage can be reduced. It becomes possible to reduce the dynamic current, thereby making it possible to reduce costs.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram showing a magnetic head device according to a first embodiment of the present invention.

FIG. 2 is a circuit diagram showing a magnetic head device according to a second embodiment of the present invention.

[Explanation of symbols]

1 head 2 Gap 3 core 4 First coil 5 Second coil 6 Drive amplifier 7 Signal source

Claims (2)

[Scope of utility model registration request] 1. A magnetic core having an air gap, a plurality of coils wound in the same direction around the magnetic core and connected in parallel to each other, and a common drive circuit for the plurality of coils. A magnetic head device featuring: 2. A magnetic core having an air gap, a plurality of coils wound in the same direction around the magnetic core, a common signal source, and between the common signal source and the plurality of coils. A magnetic head device comprising a plurality of drive circuits, each of which is provided with a plurality of drive circuits.