JP2574735Y2 - Magnetic head - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head for a floppy disk drive, and more particularly to a double-sided magnetic head.

[0002]

2. Description of the Related Art A magnetic head for a floppy disk, in particular, a double-sided magnetic head, has a first head body 3 mounted on a slide base called a carriage 1 via a gimbal plate 4 as shown in FIG. The first head main body 3 is attached to an arm 2 arranged opposite to the carriage 1.
And a second head main body 5 opposed thereto is mounted via a gimbal plate 6.

One end of the arm 2 is supported by the carriage 1 so as to be openable and closable, and the arm 2 and the carriage 1
It is opened and closed about a shaft 8 by a spring 7 interposed therebetween. When the magnetic disk 9 is set, the arm 2 is opened and the magnetic disk 9 is inserted. When the magnetic disk 9 is set, the arm 2 is closed. The carriage 1 is configured to slide along a guide bar 10 in a direction orthogonal to the recording tracks of the magnetic disk 9.

[0004] First head body 3 and second head body 5
For example, as shown FIG. 5A, B, and C, the read / write head section 11 having a read / write gap g ₁
When, the erase head portion 1 having erase gap g ₂
For example, the sliders 14 and 15 are joined to both sides of a ferrite head chip 13 of, for example, a tunnel erase type in which the two are integrated via a nonmagnetic layer 40.

The read / write head 11 comprises a front core 16 having a gap g ₁ and a back core 17 forming a closed magnetic circuit.
It is formed by mounting a bobbin 20 from which a terminal pin (bobbin terminal) 19 is wound out and wound. Also, erase head 1
2 is a front core 21 also having a gap g ₂
And a back core 22 that forms a closed magnetic circuit.

The bobbin 20 of the read / write head 11
, Three terminal pins 19 are led out, and the intermediate tap of the coil 18 and both terminals are connected to each corresponding terminal pin 19. On the other hand, in the erase head portion 12, both terminals of the coil 18 are connected to the two terminal pins 19 by connecting them. However, the bobbin for the erase head is the same as the bobbin for the read / write head because of simplification in manufacturing. In this case, three terminal pins 19 are used, and two of them are used. The back cores 17 and 22 are integrated via a nonmagnetic layer, and are pressed against the respective front cores 16 and 21 via a spring material 23.

As shown in FIGS. 6 and 7, the first head main body 3 and the second head main body 5 are adhered on the gimbal plates 4 and 6, and are adhered to the back surfaces of the gimbal plates 4 and 6. Each terminal pin 19 is inserted into a flexible printed wiring board 26 having a wiring pattern 25 and soldered. 27 is a soldering agent. And
Gimbal plates 4 and 6 to which the head bodies 3 and 5 are respectively attached correspond to the carriage 1 and the arm 2 respectively.
Are mounted on opposite sides of the vehicle.

Conventionally, the bobbin 20 with terminal pins used for the coil has the same shape or line symmetry for both the read / write head and the erase head, so that the three terminals on the read / write head 11 side are used. The lengths of the pins 19 are all the same, and the length of the terminal pins 19 on the erase head section 12 side is also the same.

Normally, as shown in FIG. 9, a gimbal plate 6 for supporting the second head body 5 is formed thinner by about 0.1 mm than a gimbal plate 4 for supporting the first head body 3. This is to enable the second head body 5 to more accurately follow the runout of the magnetic disk 9.

Therefore, the lead length a of the terminal pin 19 from the gimbal plate 4 of the first head body 3 is shorter than the lead length b of the terminal pin 19 from the gimbal plate 6 of the second head body 5.

The length of the terminal pin 19 needs to be such that the workability and reliability of soldering to the flexible printed wiring board 26 can be obtained. Is set to the required length on the side of the thick first head body 3.

[0012]

In recent years, floppy disk drives have been actively developed to be smaller and thinner. Accordingly, a magnetic head used in a floppy disk drive is required to be smaller and thinner. In particular, when the magnetic disk 9 is set on the magnetic head, the arm 2 is pivoted about the shaft 8 and tilted and opened upward, so that the carriage supported by the guide bar 10 as shown in FIG. that the first arm 2 from the position n of the reference to minimize the height h ₁ to the position m of the upper end opened it has become necessary.

The present invention has been made in view of the above points, and provides a magnetic head for a floppy disk drive which can be reduced in size and thickness.

[0014]

According to the present invention, a carriage 3 is provided.
A magnetic head for a floppy disk drive in which a first head body 3 and a second head body 5 are mounted on a first head body 3 and an arm 32 opposed to the arm 32 so as to be openable and closable via a gimbal plate 4 and 6, respectively. In the head,
The gimbal plate 6 supporting the second head body 5 is
The head body 3 is formed thinner than the gimbal plate 4 and the bobbin terminal 19 of the second head body 5 is formed shorter than the bobbin terminal 19 of the first head body 3. In this case, in particular, the gimbal plate 4 on the first head body 3 side and the gimbal plate 6 on the second head body 5 side
And the bobbin terminal 19 of the second head body 5
Can be shortened.

The present invention also relates to a carriage 31 and an arm 32 mounted on the carriage 31 so as to be openable and closable.
In a magnetic head for a floppy disk drive having a first head body 3 and a second head body 5 attached via gimbal plates 4 and 6, respectively, a second head body 5 is provided.
The bobbin terminal 19 on the inner peripheral side of the magnetic disk is formed shorter than the bobbin terminal 19 on the outer peripheral side of the magnetic disk.

[0016]

In the first invention, the length of the bobbin terminal 19 of the second head body 5 attached to the arm 32 is shorter than the length of the bobbin terminal 19 of the first head body 3 attached to the carriage 31, that is, the gimbal plate. By reducing the length of the bobbin terminal 19 of the second head body 5 by the thickness difference between 4 and 6, the thickness of the arm 32 for mounting the second head body 5 can be maintained without reducing the workability and reliability of soldering. The taste can be reduced. Therefore, when setting the magnetic disc 9, from the reference position n of the carriage 31 becomes smaller than the height h ₂ to the upper end conventional when the arms 32 are opened to the maximum, it just, the magnetic head small In addition, the thickness can be reduced.

In the second invention, among the plurality of bobbin terminals 19 of the second head body 5, the bobbin terminals 19 on the inner peripheral side of the magnetic disk are shorter than the bobbin terminals 19 on the outer peripheral side of the magnetic disk. By doing so, as a result, the thickness of the arm 32 can be reduced. Therefore, the reference position n of the carriage 31 when the magnetic disk 9 is set.
Arm 32 is smaller than the height h ₂ is the conventional arm to the upper end when opened to the maximum from the magnetic head small,
The thickness can be reduced.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to the drawings, an embodiment of a magnetic head according to the present invention will be described below.

1 and 2 show an example of the present invention. Also in the magnetic head 30 according to the present embodiment, the first head main body 3 is mounted on the carriage 31 via the gimbal plate 4 as described above, and the first head is attached to the arm 32 arranged opposite to the carriage 31. The second head main body 5 facing the main body 3 is attached via a gimbal plate 6. One end of the arm 32 is pivotally supported on the carriage 31 so as to be openable and closable. The arm 32 is opened and closed about a shaft 34 by a spring 33 interposed between the arm 32 and the carriage 31. When the disk 9 is inserted and the magnetic disk 9 is set, the arm 32 is closed. Carriage 31
Is slid along the guide bar 10 in a direction perpendicular to the recording tracks of the magnetic disk 9.

The upper end of the arm 32 has the upper surface of the carriage 31 with the arm 32 being fully opened as shown by a chain line.
Is formed on the inclined surface 32a so as to be parallel to the surface. The thickness t ₂ of the gimbal plate 6 supporting the second head body 5 is formed to be smaller than the thickness t ₁ of the gimbal plate 4 supporting the first head body 3.

First head body 3 and second head body 5
6 is attached to the gimbal plates 4 and 6 as shown in FIG. 6 and FIG. 7, and a flexible printed circuit board 26 is adhered to the back surfaces of the gimbal plates 4 and 6, so that the head bodies 3 and 5 The terminal pins, that is, the bobbin terminals 19 are soldered to the wiring pattern 25 of the printed circuit board 26. The configurations of the first head body 3, the second head body 5, the gimbal prints 4 and 6, and the printed wiring board 26 are the same as those described above, and a detailed description thereof will be omitted.

In this embodiment, however, the length of the bobbin terminal 19 of the second head body 5 is set to the first length, as shown in FIG.
The length is set shorter than the length of the bobbin terminal 19 of the head body 3. That is, since the thickness t ₁ of the gimbal print 4 supporting the first head body 3 is larger than the thickness t ₂ of the gimbal print 6 supporting the second head body 5, the thickness of both gimbal prints 4 and 6 is large. The length of the bobbin terminal 19 of the second head body 5 is shortened by the difference. Accordingly, when the head bodies 3 and 5 are attached to the gimbal plates 4 and 6, respectively, the bobbin terminals 19 protruding from the gimbal plates 4 and 6 in the first head body 3 and the second head body 5 respectively. , Both have the same protrusion length a.

In the above embodiment, the length of the bobbin terminal 19 of the second head main body 5 is determined by the thickness difference between the gimbal plates 4 and 6 from the length of the bobbin terminal 19 of the first head main body 3. Only the second head body 5
Can be made thinner.

Therefore, as shown in FIG.
When setting the, but which can be rotated arm 32 is smaller than the arm upper end to 32a the height h ₂ of the conventional height h ₁ when the arm 32 from the reference position n of the carriage 31 is opened to the maximum (H ₂ <h ₁ ). Therefore, the magnetic head 30 can be reduced in size and thickness, and as a result, the overall thickness of the floppy disk device can be further reduced.

FIGS. 3 and 4 show another embodiment of the present invention.
In this figure, parts corresponding to those in FIG. 1 are denoted by the same reference numerals, and redundant description is omitted.

In the magnetic head 35 according to the present embodiment, the bobbin terminals 19 of the second head main body 5 attached to the arm 32 are connected to the bobbin terminals 19 on the inner peripheral side of the magnetic disk 9 and the terminal pins 19 on the outer peripheral side of the magnetic disk. Set each length to be shorter than That is, as shown in FIG. 3, the three bobbin terminals 19 are formed so as to be gradually shorter from the outer peripheral side to the inner peripheral side of the magnetic disk.

According to this embodiment, the second head body 5
The bobbin terminal 19 is formed so as to be smaller from the outer peripheral side to the inner peripheral side of the magnetic disk 9 so that the arm 3
The slanted surface 32a at the tip of No. 2 can be made more gentle, and the thickness d of the arm can be made thinner than before.

[0028] Therefore, when setting the magnetic disk 9, the height h ₂ to the upper end 32a is smaller than the conventional height h ₁ when the arm 32 from the reference position n of the carriage 31 is opened to the maximum. That is, as shown in FIG. 4, when a conventional three bobbin terminals 19 are all of the same length, the height at which the arms 32 are opened to the maximum is h _1, in this embodiment it a lower height h _2.

Therefore, the overall thickness of the magnetic head 35 can be reduced, and the overall thickness of the floppy disk drive can be reduced, and the size can be further reduced.

[0030]

According to the present invention, in the double-sided magnetic head, by changing the length of the bobbin terminal of the second head body attached to the rotating arm, the arm thickness can be further increased as compared with the prior art. And the magnetic head can be made smaller and thinner. Therefore, it is possible to reduce the size and thickness of the floppy disk device as a whole.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing an example of a magnetic head according to the present invention.

FIG. 2 is a schematic configuration diagram of first and second head bodies according to the present invention.

FIG. 3 is a configuration diagram showing another example of the magnetic head according to the present invention;

FIG. 4 is a schematic configuration diagram of a second head body according to the present invention.

FIG. 5 is a configuration diagram of a magnetic head main body.

FIG. 6 is a cross-sectional view in which the head main body is mounted on a gimbal plate and a flexible printed wiring board.

FIG. 7 is a perspective view in which a head main body is attached to a gimbal plate and a flexible printed wiring board.

FIG. 8 is a configuration diagram of a conventional magnetic head.

FIG. 9 is a schematic configuration diagram of conventional first and second head bodies.

[Explanation of symbols]

1,31 carriage 2,32 arm 3,5 head body 4,6 gimbal plate 9 a magnetic disk 10 guide bar 19 the bobbin terminals g ₁ read / write gap g ₂ erase gap

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) G11B 17/32 G11B 5/127

Claims (2)

(57) [Scope of request for utility model registration] 1. A magnetic head for a floppy disk drive, comprising a first head main body and a second head main body mounted on a carriage and an arm opposed to the carriage so as to be openable and closable via a gimbal plate, respectively. Wherein the gimbal plate supporting the second head main body is formed thinner than the gimbal plate supporting the first head main body, and the bobbin terminal of the second head main body is connected to the bobbin terminal of the second head main body. A magnetic head formed short. 2. A magnetic head for a floppy disk drive, comprising a first head main body and a second head main body mounted on a carriage and an arm opposed to the carriage so as to be openable and closable via the gimbal plate, respectively. In the magnetic head, the bobbin terminal on the inner peripheral side of the magnetic disk of the second head body is shorter than the bobbin terminal on the outer peripheral side of the magnetic disk.