JPH07141636A - Composite type magnetic head and fpc - Google Patents

Abstract

PURPOSE:To protect an MR element against static electricity, to improve a non-defective article rate and yield in an assembling stage and to maintain quality by shorting the signal reading side terminal of the composite type magnetic head formed by using an FPC. CONSTITUTION:A composite type magnetic head slider 3 connected with the FPC 1 is adhered to a gimbal suspension 4 and the FPC 1 is fixed to this gimbal suspension 4. The terminal side terminal part 2 of the FPC 1 is connected to the electric circuit of a magnetic disk driving device. The MR element is held shorted by shorting lines in such a case even if a human body, assembling equipment, jigs and tools, transporting cases, etc., having static electricity come into contact or proximity with the MR element, therefor, just extremely slight currents flow to the MR element and the destruction of the MR element does not arise.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite magnetic head for recording or reproducing information on a magnetic recording medium and an FPC used therein.

[0002]

2. Description of the Related Art FPC (flexible printed circuit board) used in a composite type magnetic head in which a conventional thin film magnetic head for recording and an MR head (magnetoresistive head) for reproducing are combined with each other with reference to FIGS. Will be described with reference to. FIG. 4 is an overall view showing a composite magnetic head using a conventional FPC 11, and FIG. 5 is a detailed view of a terminal side terminal portion 12 of the conventional FPC 11.

The FPC 11 has signal reading side terminals 5 and 6 and signal writing side terminals 8 on the base film.
9 are provided separately. Signal reading side terminal 5,
No. 6 is separated, and when a voltage is applied to both sides thereof, a current flows through the MR element inside the composite magnetic head slider 3. In the conventional FPC as described above, during the assembly process or transportation of the composite magnetic head, the human body,
High-voltage static electricity, such as assembly equipment, jigs, and transport cases, is applied to the signal reading side terminals 5 and 6, causing a current that exceeds the allowable range to flow in the MR element.
There is a problem that the R element is destroyed.

[0004]

In the field of magnetic recording, a composite type magnetic head has been developed in the midst of an increase in recording density, and problems that have not been a problem with conventional thin film magnetic heads for recording and reproduction have been encountered. Came. In the conventional thin film magnetic head, even if a high voltage static electricity is applied, it does not exceed the permissible range of the wire, coil or internal element, and there is no problem that they are destroyed.

Further, it is not necessary to take precautions against static electricity and take countermeasures in the conventional assembling process and transportation of the thin film magnetic head. As the recording density has increased, the magnetic head has become smaller and thinner, and it has become difficult to handle the magnetic head. It is also difficult to assemble the magnetic head while paying attention to static electricity. . It is an object of the present invention to provide a composite magnetic head which prevents the destruction of the MR element due to static electricity, improves the yield rate in the assembly process, improves the yield, and maintains its quality.

[0006]

In order to solve the above problems, the present invention provides two signal reading side terminals of an FPC for electrically connecting a composite magnetic head and an electric circuit of a magnetic disk drive device. At least two of the signal reading side terminals out of a total of four terminals of the signal writing side terminals are short-circuited.

[0007]

In the composite type magnetic head to which the FPC is connected as described above, a large amount of current flows through the short-circuit line having a low resistance value even if the anode and cathode voltages are applied to both poles of the MR element. Since only a small current flows, M
The R element will not be destroyed.

[0008]

An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an overall view showing a composite type head using an FPC 1 according to the present invention. The composite type magnetic head slider 3 to which the FPC 1 is connected is adhered to the gimbal suspension 4, and the F is attached to the gimbal suspension 4.
PC1 is fixed. Then, the terminal side terminal portion 2 of the FPC 1 is connected to an electric circuit (not shown) of the magnetic disk drive device.

FIG. 2 is a detailed view of the terminal side terminal portion 2 of the FPC 1. Before connecting to the electric circuit of the magnetic disk drive device, the terminal-side terminal portion 2 of the FPC 1 is disconnected, for example, at A-A 'so that the signal reading-side terminals 5 and 6 are opened from the short-circuited state. use.

In the FPC 1 according to the present invention, by connecting the short-circuit wire 7 to the signal reading side terminals 5 and 6 in the terminal side terminal portion 2, the signal reading side terminals 5 and 6 or the inside of the composite magnetic head slider 3 are connected. Even if a high voltage due to static electricity is applied to the MR element, a large amount of current flows through the short-circuit line 7 having a low resistance value and only a very small current flows through the MR element, so that the MR element is not destroyed.

Since the short-circuit line 7 is patterned at the same time as the mask used for manufacturing the FPC 1 including the mask of the short-circuit line 7, no man-hour cost for short-circuiting is required and the man-hour and cost are the same as those of the conventional FPC 11. Can be made with. Furthermore, since the short-circuit line 7 which is not required when the composite magnetic head is incorporated in the magnetic disk drive device and wired is located at the extreme end of the terminal portion 2 on the terminal side, it can be easily cut.

FIG. 3 is a detailed view of the terminal-side terminal portion 2 of the FPC according to another embodiment. The difference between this embodiment and the embodiment of FIG. 2 is whether the short-circuit line 7 is connected in a form projecting from the terminal portion on the terminal side or not, and there is no difference in operation. This may be set arbitrarily in design. FP
Before connecting to the electric circuit of the magnetic disk drive device, the terminal side terminal portion 2 of C1 is cut off at BB ', for example, and the signal reading side terminals 5 and 6 are used after being opened from the short-circuited state. .

[0013]

As described above, in the composite type magnetic head according to the present invention, the MR element is short-circuited by the short-circuit line even if the electrostatically charged human body, the assembly equipment, the jig, the carrying case, etc. come into contact with or come close to each other. Therefore, a very small amount of current does not flow in the MR element and the MR element is not destroyed. Therefore, it is possible to provide a composite magnetic head in which the yield rate in the assembly process is improved, the yield is improved, and the quality is maintained.

[Brief description of drawings]

FIG. 1 is an overall view showing a composite magnetic head using an FPC according to an embodiment of the present invention.

FIG. 2 is a detailed view showing a terminal side terminal portion of an FPC according to an embodiment of the present invention.

FIG. 3 is a detailed view showing a terminal-side terminal portion of an FPC according to another embodiment of the present invention.

FIG. 4 is an overall view showing a composite magnetic head using a conventional FPC.

FIG. 5 is a detailed view showing a terminal-side terminal portion of a conventional FPC.

[Explanation of symbols]

 1 FPC 2 terminal side terminal part 3 composite type magnetic head slider 4 gimbal suspension 5 signal reading side terminal 6 signal reading side terminal 7 short-circuit line 8 signal writing side terminal 9 signal writing side terminal 11 FPC 12 terminal side terminal part

Claims (2)

[Claims] 1. A composite magnetic head in which an MR element for reading magnetic recording information and a thin film magnetic head for writing magnetic recording information are stacked on a substrate, and a composite magnetic head and an electric circuit of a magnetic disk drive device are provided. A composite magnetic head in which at least two of the signal reading side terminals and the signal writing side terminals of the FPC for electrically connecting the two are short-circuited. 2. An FPC for electrically connecting a composite type magnetic head and an electric circuit of a magnetic disk drive device, wherein two signal reading side terminals and two signal writing side terminals 2 are provided.
An FPC, characterized in that at least two of the signal reading side terminals are short-circuited among the four terminals in total.