JPH06333203A - Magnetic head device - Google Patents

Abstract

(57) [Summary] [Object] The present invention provides an inexpensive magnetic head device for transmitting a signal output from a magnetic head with a high S / N ratio without being affected by disturbance noise in a magnetic recording system. provide. A magnetic head device of the present invention comprises a magnetic head chip and a circuit board on which a recording / reproducing amplifier is mounted.
They are configured as an integrated device. According to the structure of the present invention, the transmission line between the magnetic head and the reproduction amplifier, which has the smallest output signal and is easily affected by the disturbance noise, is much shorter than the conventional one, and the reproduction signal is transmitted at a high S / N ratio. Will be possible.

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 for recording and / or reproducing information using a magnetic recording medium.

[0002]

2. Description of the Related Art Conventionally, in a recording and / or reproducing apparatus such as an FDD, an HDD, an electronic still camera, a VTR, and a DAT, the magnetic head assembly is mounted on a head carriage or a rotating drum due to the structure of the apparatus, and the head is inserted. The output terminal is connected to the recording / reproducing amplifier of the apparatus through a conductor of several cm after being sufficiently shielded from disturbance noise such as a shield. Further, in order to enhance the shielding effect, a technique of forming a thin film magnetic head and an amplifying element on the same circuit board has been proposed (for example, Japanese Patent Laid-Open No. 63-46614).
issue). In addition, a technique for forming a circuit on a head base without changing the mounting shape has been proposed (Japanese Patent Laid-Open No. 64-502).
16).

[0003]

However, in the prior art, the net output voltage from the magnetic head is several tens of μV to several mV, especially in the reproducing process, and therefore, an appropriate signal for the electromagnetic disturbance noise is generated. In order to maintain the quality, it was necessary to shorten the length of the lead wire connecting the head output terminal and the regenerative amplifier as much as possible, and also in the wiring, special know-how according to the mounted device. Therefore, it is difficult to capture the signal from the magnetic head into the circuit board with a high S / N ratio.
There is a problem that the requirements are in conflict with the optimal layout for deviceization. Further, in order to solve this problem, a method of mounting the head on the head by using a thin film process technology (see the above-mentioned JP-A No.
No. 3-46614) or a circuit implemented by using the same technology (Japanese Patent Laid-Open No. 64-50216) has a problem that the cost becomes high.

[0004]

SUMMARY OF THE INVENTION The present invention aims to solve these problems of the prior art, and comprises a magnetic head chip, a recording and / or reproducing circuit, and a circuit board, which are integrated. Magnetic head device, and a magnetic head chip in which a main part of a core material is a bulk magnetic material such as ferrite or a thick film magnetic material, a recording and / or reproducing circuit, and a circuit board, and these are integrated. The device further comprises a magnetic head chip, a recording and / or reproducing circuit, and a circuit board which are integrated with each other, and the circuit board has at least an electrode that is at a ground potential in operation, and electrically contacts the magnetic head chip and the circuit board. The magnetic head device formed in the partial area is provided.

[0005]

According to the magnetic head device having the structure of the present invention,
The conductor portion through which a weak signal of the magnetic head and the recording and / or reproducing amplifier flows becomes extremely short, and the pickup of disturbance noise in this portion, which has been regarded as a problem in the past, can be reduced.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 are schematic views of the configuration of an embodiment of the present invention. (A) of FIG. 1 is a plan view, (b) is a bottom view, (a) of FIG. 2 is a plan view, and (b) is It is a side view, the same parts are indicated by the same reference numerals in the drawings, and in the drawings, 1 is a circuit board,
Reference numeral 2 is an electrode at ground potential, 3 is a magnetic head chip, 4 is a head output signal line, 5 is a recording / reproducing amplifier, and 7 is a conductive steel plate.

In FIG. 1, the magnetic head chip 3 has a core material mainly composed of a bulk magnetic material such as ferrite or a thick film magnetic material, and is adhered or fused onto the ground electrode of the magnetic head chip circuit board 1. . Both ends of the winding of the head chip are directly connected to the head output signal line 4 on the substrate. The head output signal line 4 is connected to the recording / reproducing amplifier 5. Thus, in the magnetic recording apparatus according to the present embodiment, transmission / reception of a high S / N signal is achieved by the conductor between the extremely short head and the recording / reproducing amplifier. The mounting is screwed to the mechanical portion using the board hole 6.

In FIG. 2, the circuit board 1 has a plywood structure with a conductive steel plate 7 in order to secure a shielding effect and mechanical rigidity. In this case, the conductive steel plate 7 is at the ground potential due to the operation of the circuit, and the magnetic head chip 3 is attached to this conductive steel plate 7. The circuit pattern is formed only on one side of the substrate.
Also in the magnetic recording apparatus of this embodiment, transmission / reception of a high S / N signal can be achieved by a conductor between the extremely short head and the recording / reproducing amplifier.

[0009]

As described above, according to the configuration of the present invention, a signal having a higher S / N than the conventional one can be easily secured in transmitting the weakest signal in the magnetic head device without requiring special know-how. it can. Further, the magnetic head base which has been conventionally used becomes unnecessary. Moreover, at least the head output amplified by this apparatus is less susceptible to noise due to the subsequent wiring of the conducting wire, so that the degree of freedom in the arrangement of parts of the entire system is increased.

Further, by constructing the bulkhead core which is most widely used and an inexpensive paper-epoxy substrate, the manufacturing cost is significantly reduced.

[Brief description of drawings]

FIG. 1 is a schematic diagram of the configuration of a first embodiment of the present invention.

FIG. 2 is a schematic diagram of the configuration of a second embodiment of the present invention.

[Explanation of symbols]

 1 circuit board 2 electrode 3 magnetic head chip 4 head output signal line 5 recording / reproducing amplifier 6 substrate hole 7 conductive steel plate

Claims (3)

[Claims] 1. A magnetic head device comprising a magnetic head chip, a recording and / or reproducing circuit, and a circuit board, which are integrated. 2. A main part of a core material comprises a magnetic head chip made of a bulk magnetic material such as ferrite or a thick film magnetic material, a recording and / or reproducing circuit, and a circuit board, which are integrated. And magnetic head device. 3. An integrated magnetic head chip, a recording and / or reproducing circuit, and a circuit board, wherein the circuit board has at least an electrode that is at a ground potential in operation and is electrically connected to the magnetic head chip and the circuit board. A magnetic head device, wherein the magnetic head device is formed in a static contact portion region.