JPH07110908A - Magnetic head apparatus - Google Patents

Abstract

PURPOSE:To obtain a magnetic head apparatus which improves earthing effect. CONSTITUTION:This apparatus has at least a magnetic core 1 housed into a shield case 4, a core keeper 2 which is arranged between the magnetic core and the shield case to hold the magnetic core and a bent plate spring-shaped earth spring 3 which is arranged between the core keeper and the shield case to energize the magnetic core at a specified position through the core keeper. In a magnetic head device made conductive to the shield case 4, the earth spring 3, the core keeper 2 and the magnetic core, a protruded part 3a is provided at a part contacting the shield case 4 out of a bent part of the earth spring 3 to keep the earth spring 3 into point contact with the shield case 4.

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.

[0002]

2. Description of the Related Art A conventional magnetic head device will be described with reference to FIGS. FIG. 3 is a sectional view of a conventional magnetic head device. 4A and 4B are views for explaining the action and shape of the conventional ground spring, FIG. 4A is an enlarged view of the ground spring, the core retainer, and the shield case, FIG. 4B is a side view of the ground spring, and FIG. 4C is a front view of the ground spring. is there. FIG. 5 is an explanatory diagram of a problem when the hardness of the earth spring is increased to increase the spring force.

In FIG. 3, a conventional magnetic head device is
A shield case 4, a magnetic core 1 housed in the shield case 4, a core retainer 2 arranged between the magnetic core 1 and the shield case 4 for holding a magnetic core, a core retainer 2 and a shield. It is composed of a curved plate spring-shaped earth spring 3B which is disposed between the case 4 and the core retainer 2 and biases the magnetic core 1 to a predetermined position.

A bobbin 5 around which a coil is wound is mounted on the magnetic core 1. The ground of the magnetic head device will be described. In FIG. 3, due to the sliding contact with the magnetic tape 6, static electricity is accumulated in the magnetic core 1, the accumulated static electricity flows to the core retainer 2, and the static electricity charged in the magnetic core 1 and the core retainer 2 passes through the earth spring 3B. , Flows to the shield case 4.

When static electricity is accumulated in the magnetic core 1, spark discharge is likely to occur, which causes noise and the like, which adversely affects recording and reproducing characteristics. Therefore, the earth spring 3B connecting the magnetic core 1, the core retainer 2 and the shield case 4 plays an important role.

The current earth spring 3B has a leaf spring shape which is simply curved into an R shape as shown in FIG. Therefore, in the current earth spring 3B, since the contact area between the shield case 4 and the earth spring 3B is wide, the pressure is weak and a slight gap is generated in the contact portion due to the unevenness of the surface of the shield case 4. Further, if a gap is formed, the casting resin will easily flow in, and the resin that has flowed in will expand and hinder conduction by the ground spring 3B.

Further, in order to improve these problems, FIG.
As shown in, when the hardness of the earth spring 3C is increased to increase the spring force, the magnetic core 1 and the core presser 2 are deformed by the strong pressure, and the gap 7 and the back gap 8 are opened,
There is another problem that the deviation occurs and the characteristics deteriorate.

[0008]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and an object thereof is to provide a magnetic head device having an improved grounding effect.

[0009]

A magnetic head device according to the present invention includes at least a magnetic core housed in a shield case,
A core retainer that is disposed between the magnetic core and the shield case and holds the magnetic core, and a curve that is disposed between the core retainer and the shield case and that biases the magnetic core to a predetermined position via the core retainer. A leaf spring-shaped ground spring
In a magnetic head device having a shield case, an earth spring, a core retainer, and a magnetic core electrically connected, a convex portion is provided at a portion of the curved portion of the earth spring that comes into contact with the shield case, and the earth spring and the shield case are connected to each other. It is characterized by point contact.

[0010]

In the curved portion of the earth spring, a convex portion is provided at a portion that comes into contact with the shield case, and the earth spring and the shield case are in point contact with each other to concentrate the pressure on the contact portion and strengthen the partial pressure. As a result, the ground effect is prevented from deteriorating due to the flow of resin, and the pressure applied to the inside of the head does not change, so there is no effect on the gap or back gap and no effect on the characteristics. The earth spring of the present invention enables more reliable grounding.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. First, the main configuration of the present invention will be described with reference to FIG. FIG. 2 is a sectional view of the magnetic head device of the present invention.

In FIG. 2, the magnetic head device of the present invention is arranged at least between the magnetic core 1 housed in the shield case 4 and the magnetic core 1 and the shield case 4, and holds the magnetic core 1. A core retainer 2 and a curved leaf spring-shaped earth spring 3 which is disposed between the core retainer 2 and the shield case 4 and biases the magnetic core 1 to a predetermined position via the core retainer 2. The shield case 4, the earth spring 3, the core retainer 2, and the magnetic core 1 are electrically connected.

FIG. 1 is a view for explaining the action and shape of the earth spring 3 of the present invention. FIG. 1A is an enlarged view of the earth spring 3, the core retainer 2 and the shield case 4, and FIG. 1B is a side view of the earth spring 3. 1C is a front view of the earth spring 3. A feature of the present invention is that, as shown in FIG. 1, a convex portion 3a is provided in a portion of the curved portion of the earth spring 3 that comes into contact with the shield case 4, and the earth spring 3 and the shield case 4 are in point contact. is there.

A convex portion 3a is provided at a portion of the curved portion of the earth spring 3 that comes into contact with the shield case 4, and the earth spring 3
And the shield case 4 are brought into point contact with each other to concentrate the pressure on the contact portion and strengthen the partial pressure. As a result, the ground effect is prevented from deteriorating due to the flow of resin, and the pressure applied to the inside of the head does not change, so there is no effect on the gap or back gap and no effect on the characteristics.
Furthermore, the earth spring of the present invention enables more reliable grounding.

[0015]

【The invention's effect】

(1) It is easy to implement because the material and the large shape are not changed by only partially changing the shape of the current earth spring. (2) Since a more reliable ground can be obtained than the current ground spring, the failure rate of ground failure can be reduced.

[Brief description of drawings]

FIG. 1 is a view for explaining the action and shape of an earth spring of the present invention, FIG. 1A is an enlarged view of an earth spring, a core retainer, and a shield case, FIG. 1B is a side view of the earth spring, and FIG. 1C is a front view of the earth spring. It is a figure.

FIG. 2 is a sectional view of a magnetic head device of the present invention.

FIG. 3 is a sectional view of a conventional magnetic head device.

FIG. 4 is a view for explaining the action and shape of a conventional earth spring, FIG. 3A is an enlarged view of the earth spring, the core retainer, and the shield case, and FIG. 3B is a side view of the earth spring.
FIG. 3C is a front view of the ground spring.

FIG. 5 is an explanatory diagram of a problem when the hardness of the earth spring is increased to increase the spring force.

[Explanation of symbols]

 1 magnetic core 2 core retainer 3 earth spring 3a convex portion 4 shield case 5 bobbin 6 magnetic tape

Claims (1)

[Claims] 1. A magnetic core housed in at least a shield case, a core retainer disposed between the magnetic core and the shield case to retain the magnetic core, and between the core retainer and the shield case. A magnetic head device having a shield case, an earth spring, a core retainer, and a magnetic core electrically connected to each other, which includes a curved leaf spring-shaped earth spring that biases the magnetic core to a predetermined position via the core retainer. A magnetic head device characterized in that a convex portion is provided in a portion of the curved portion of the earth spring that comes into contact with the shield case, and the earth spring and the shield case are in point contact.