JP2937720B2 - Composite magnetic head and FPC - Google Patents

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 for the same.

[0002]

2. Description of the Related Art FIGS. 4 and 5 show an FPC (flexible printed circuit board) used in a composite magnetic head in which a conventional thin-film magnetic head for recording and an MR head (magnetoresistive head) for reproduction are combined. This will be described with reference to FIG. FIG. 4 is an overall view showing a composite magnetic head using the 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 terminals 5, 6 and signal writing terminals 8, 8 on a base film.
9 are provided separately. Signal reading terminal 5,
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, the human body,
High voltage static electricity from the assembly equipment, jigs and tools, transport case, etc. is applied to the signal reading terminals 5 and 6, which causes an unacceptable current to flow through 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 as the recording density has been increasing, and there has been a problem that was not a problem with the conventional thin film magnetic head for recording and reproduction. Have been. In the conventional thin-film magnetic head, even if high-voltage static electricity is applied, it does not exceed the allowable range of wires, coils, internal elements, and the like, and there is no problem that they are destroyed.

In addition, there is no need to take any precautions against static electricity or take measures during the assembling process, transportation and the like of the conventional thin film magnetic head. With the progress of higher recording density, magnetic heads have become smaller and thinner, and handling of magnetic heads has become more difficult.As a result, it has become difficult to assemble while paying attention to static electricity. . SUMMARY OF THE INVENTION It is an object of the present invention to provide a composite magnetic head in which the MR element is prevented from being damaged by static electricity, the yield rate in the assembly process is improved, the yield is improved, and the quality is maintained.

[0006]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a method for reading magnetically recorded information on a substrate.
MR element and thin film magnet for writing magnetic recording information
At least one of the two signal reading terminals and the signal writing terminals of the FPC for electrically connecting the composite magnetic head having the stacked heads to the electric circuit of the magnetic disk drive device has at least the signal reading terminals. The two are short-circuited.

[0007]

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

[0008]

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

FIG. 2 is a detailed view of the terminal part 2 of the FPC 1. Before connecting to the electric circuit of the magnetic disk drive, the terminal 2 on the terminal side of the FPC 1 is cut off, for example, at AA ′, and the signal reading side terminals 5 and 6 are changed from the short-circuit state to the open state. use.

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

Since the short-circuit line 7 is patterned simultaneously with 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 manufactured. Furthermore, since the short-circuit line 7 which is unnecessary when the composite magnetic head is incorporated in a magnetic disk drive and wiring is performed is located at the extreme end of the terminal 2, it can be easily cut.

FIG. 3 is a detailed view of a terminal portion 2 of an FPC according to another embodiment. The difference between this embodiment and the embodiment of FIG. 2 lies in whether the short-circuit line 7 is connected so as to protrude from the terminal side terminal portion or is connected without protruding, and there is no difference in operation. This may be set arbitrarily in design. Note that FP
Before connecting to the electric circuit of the magnetic disk drive, the terminal 2 on the terminal side of C1 is cut off at, for example, BB ', and the signal reading side terminals 5 and 6 are used from the short-circuit state to the open state. .

[0013]

As described above, on the substrate according to the present invention ,
Element for reading magnetically recorded information and magnetic recording
In a composite magnetic head in which thin-film magnetic heads for writing information are stacked, the MR element is short-circuited by a short-circuit line even when an electrostatically charged human body, assembly equipment, jigs, a transport case, etc. come in contact with or approach. since MR element not flow very small current Mr does MR element is not destroyed. Therefore, it is possible to provide a composite magnetic head in which the yield rate and the yield in the assembling process are improved and the quality is maintained.

[Brief description of the 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 portion on the terminal side of the FPC according to one embodiment of the present invention.

FIG. 3 is a detailed view illustrating a 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 portion of a conventional FPC.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 FPC 2 Terminal side terminal part 3 Composite 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 (4)

(57) [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 laminated on a substrate, the composite magnetic head and an electric circuit of a magnetic disk drive device. A composite type magnetic head characterized in that at least two of the signal reading side terminals among a total of four terminals of two signal reading side terminals and two signal writing side terminals of the FPC for electrically connecting the two terminals are short-circuited. 2. Two terminals on the signal reading side from the MR element
2. The device according to claim 1, wherein the components are arranged adjacent to each other.
Composite magnetic head. 3. A method for reading magnetically recorded information on a substrate.
MR element and thin-film magnetic head for writing magnetic recording information
Heads and magnetic disk drives
FPC that electrically connects the electrical circuit of the
And two signal reading terminals and two signal writing terminals
Out of the total of four terminals
An FPC comprising two short-circuits. 4. Two terminals for reading signals from the MR element are provided.
4. The device according to claim 3, wherein the components are arranged adjacent to each other.
FPC .