JP2514976B2 - Floating magnetic head device - Google Patents

Description

The present invention relates to a floating magnetic head device used in a magnetic disk device or the like.

[Conventional technology]

As shown in FIG. 2 (a), a gimbal 2 is fixed to a tip end of a load arm 1 made of a triangular and tapered metal plate in a floating magnetic head device used in a magnetic disk device or the like. The core slider 3 is fixed to the gimbal 2, the magnet wire 4 is wound around the core portion 3a of the core slider 3, and the magnet wire 4 is passed through the tube 5 made of plastic or the like and extended to the head arm (not shown) side. There is.

The tube 5 containing the magnet wire 4 has a bifurcated shape formed at the tip of the load arm 1.
Inside the groove of the tip holding portion 1a bent 90 °, under the claw-shaped intermediate holding portion 1b formed on the flat portion 1d of the load arm 1, and in a forked shape formed near the base portion of the load arm 1.
It is slightly tightly inserted into the groove of the rear end holding portion 1c bent at 90 ° and held so as not to come out.

Incidentally, 6 is a spacer fixed to the base of the load arm 1.

[Problems to be Solved by the Invention]

In the above conventional floating magnetic head device, the tube 5 is crimped by inserting the tube 5 into the two grooves of the front end holding portion 1a and the rear end holding portion 1c and caulking the claws of the intermediate holding portion 1b as described above. And are held in three places.

Therefore, the tube holding force is limited, and there is a problem that the tube 5 may come off the holding portion due to vibration during assembly of the magnetic disk device or during operation of the magnetic disk device.

In particular, the caulking holding force of the intermediate holding portion 1b varies depending on the direction in which the tube 5 is pulled out from the base portion of the load arm 1.

That is, when the tube 5 is pulled out upward as shown in FIG. 2 (a), as compared with the case where the tube 5 is pulled downward, as shown in FIG. 2 (c) from the intermediate holding portion 1b. 5 is easy to slip out to the right in the figure. In any case, the holding of the tube 5 on the load arm 1 is easily released,
It has a problem of low reliability.

Therefore, instead of the long magnet wire as described above, a flexible printed circuit board (hereinafter referred to as “FP
"C". ) Is used. JP 6
In the 1-160815 publication, a flexible portion is provided on the FPC arranged along the support body, and the tip of the flexible portion is fixed to the side surface of the slider held on the support body and wound around the connection terminal of the FPC and the electromagnetic conversion element. There is disclosed a technique of connecting the terminals of the conductor coil with a thin wire.

Further, in Japanese Utility Model Laid-Open No. 61-93817, a hole is provided in the vicinity of a magnetic head of a gimbal spring having a magnetic head supported by an arm, and the end of the coil is bent through the hole.
A magnetic head device connected to an FPC is disclosed.

However, in the example of Japanese Patent Laid-Open No. 61-160815, when fixing the FPC along the support to the side surface of the slider, the FPC is not simply bent in two dimensions but is bent in three dimensions. However, it is necessary to provide a bending portion. Therefore, there is a strong possibility that the FPC may be deformed, and the FPC may be peeled off or an obstacle such as a wire breakage may occur due to the influence of vibration or the like during operation.

Further, in Japanese Utility Model Laid-Open No. 61-93817, since the coil and the FPC whose tip is bent are connected, the FPC is largely deformed by an external force such as vibration, and there is a strong possibility that the FPC is similarly broken.

[Means for solving the problem]

In order to solve the above problems, the present invention fixes a slider equipped with an electromagnetic conversion element to the tip of a load arm via a gimbal, and a magnet wire wound around the electromagnetic conversion element, and at least the load arm. In a floating magnetic head device in which a flexible printed circuit board held by a front end portion, a flat surface portion, and a vicinity of a base portion is connected, a bending step portion is formed at a front end portion of the load arm,
The flexible printed circuit board is adhered to the vicinity of the base through the flat portion with the bent step as a starting point, and the terminal of the flexible printed circuit board and the end of the magnet wire wound around the electromagnetic conversion element. Is provided on the bent step portion, and a floating magnetic head device is provided.

[Action]

Since the FPC was adhered from the bent step at the tip of the load arm to the vicinity of the base through the flat part of the load arm,
The long magnet wire is unnecessary, and the magnet wire does not fall off the load arm due to vibration or shock during the assembly or operation of the magnetic disk device.

In addition, since the short magnet wire and the FPC are connected on the bent step formed at the tip of the load arm, the work is easy and the connection is reliable and the connection does not come off during use. And magnet wire and FP
Since the connection with the end of C is at the bending step of the load arm and FPC, the displacement due to vibration is small compared to when only FPC is used, so the connection is less likely to disconnect.

Furthermore, since the FPC is attached to the load arm only by sticking, there is no need to crimp with the holding portion formed like a nail as in the conventional case, so that the assembly is easy.

〔Example〕

 An embodiment of the present invention will be described below with reference to FIG.

FIG. 1A is a plan view, and FIG. 1B is an enlarged view of FIG.

In the figure, reference numeral 1 denotes a load arm made of a metal plate having a triangular shape in a plane and extending in a taper shape. 7 are formed. A gimbal 2 is fixed to the tip of the load arm 1, and a core slider 3 is fixed to the gimbal 2.

Furthermore, the FPC is adhered to the load arm 1 from the bending step 7 as a starting point to the vicinity of the base through the flat portion 1d of the load arm 1 and its terminal 8a on the bending step 7, The end of the magnet wire 4 wound around the core portion 3a of the core slider 3 is connected.
Incidentally, 6 is a spacer fixed to the base of the load arm 1.

As described above, the bending step portion 7 is formed at the tip of the load arm 1, and the FPC 8 is adhered through the flat surface portion from this step portion to the vicinity of the base portion. Therefore, considerable vibration is applied after the adhesion. However, the adhesive does not peel off and fall off the load arm.

Further, since the magnet wire 4 and the terminal 8a of the FPC 8 are connected on the bent step portion 7, the connection can be made easily and surely, and the connection is not disconnected from this portion even if a considerable vibration is applied.

Furthermore, in order to mount the FPC8 on the flat surface portion 1d of the load arm 1, it is only necessary to adhere the flat surface portion 1d as described above.
A claw-shaped intermediate holding portion 1b (see FIG. 2) is formed on the surface of the intermediate holding portion 1b, which eliminates the need for caulking work and improves work efficiency.

〔The invention's effect〕

As mentioned above, according to the present invention, the FP to the load arm
C can be easily held by adhesion, and the magnet wire and FPC can be easily connected. Further, it is possible to obtain a highly reliable floating type magnetic head device without dropping off after attachment.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention, (a) is a plan view,
(B) is an enlarged view of the arrow A of (a), FIG. 2 shows an example of a conventional floating magnetic head device, (a) is a plan view, (b)
7A is an enlarged view of the arrow B in FIG. 7A, FIG. 7C is an enlarged cross-sectional view of CC of FIG. 8A, and FIG. 1: load arm, 1a: plane part 2: gimbal 3: core slider, 3a: core part 4: magnet wire 7: bent step part 8: flexible printed circuit board, 8a: terminal

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A 61-160815 (JP, A) JP-A 61-104315 (JP, A) Actually opened 61-79816 (JP, U) Actually opened 57- 164873 (JP, U)

Claims (1)

(57) [Claims] 1. A magnet wire having an electromagnetic conversion element mounted thereon is fixed to the tip of the load arm via a gimbal, and the magnet wire is wound around the electromagnetic conversion element, and at least the tip of the load arm and a plane portion. In a floating magnetic head device connected to a flexible printed circuit board held in the vicinity of a base, a bending step is formed at the tip of the load arm, and the bending step is used as a starting point to pass through a flat surface and the vicinity of the base. A flexible printed circuit board is adhered between the terminals and the terminal of the flexible printed circuit board and the end of the magnet wire wound around the electromagnetic conversion element are connected on the bent step. Floating type magnetic head device.