JPH11203647A - Magnetic head chip mounting structure for magnetic disk drive - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a magnetic head chip mounting structure capable of simplifying the shape of a planar member for mounting a magnetic head chip. SOLUTION: The magnetic head chip 154 is mounted on a non-conductive substrate 1 at the bottom face side provided with plural pin terminals 154-1. The plural pin terminals 154-1 are respectively connected to a wiring pattern of a flexible printed circuit board 156 provided on the lower surface side of the non-conductive substrate 1 passing through-holes arranged on the non- conductive substrate 1. An opening 15-32 whose size is slightly smaller than that of the non-conductive substrate 1 is provided on a flat plate 15-3 for a lower carriage, and the non-conductive substrate 1 is fixed to the edge part of the opening 15-32.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information recording / reproducing disk (hereinafter referred to as a magnetic disk) having a structure in which a flexible disk on which information is recorded / reproduced is housed in a case like a floppy disk. The present invention relates to a magnetic disk drive for reading / writing data.

[0002]

2. Description of the Related Art Referring to FIG. 4, a structure of a conventional magnetic disk drive, particularly around a moving mechanism for moving a magnetic head, will be described. Such a structure
For example, it is disclosed in Japanese Patent Application No. 7-2967. A magnetic disk (not shown) is inserted into the magnetic disk drive from the direction indicated by arrow A in FIG. The inserted magnetic disks are held on the disk table (disk holding mechanism) 11 with their central axes coincident with each other. The disk table 11 is connected to the frame substrate 1 via a spring 12.
3 is rotatably supported on the surface. The disk table 11 is rotationally driven by a motor (not shown) provided on the back surface of the frame substrate 13, whereby the magnetic disk rotates. A printed wiring board (not shown) on which a large number of electronic components are mounted is attached to the back surface of the frame board 13.

A magnetic disk drive has a pair of magnetic head chips (only one is shown at 14) for reading / writing data from / to a magnetic disk. The pair of magnetic head chips is held by the carriage mechanism 15. The combination of the pair of magnetic head chips and the carriage mechanism 15 is called a carriage assembly. The carriage mechanism 15 is arranged on the surface of the frame substrate 13 so as to be separated from the frame substrate 13 as described later. The carriage mechanism 15 holds a pair of magnetic head chips movably along a predetermined radial direction (direction indicated by an arrow B in FIG. 4) with respect to the magnetic disk.

The stepping motor 16 is fixed to a rear wall 131 of the frame substrate 13. The stepping motor 16 drives the carriage mechanism 15 in a predetermined radial direction B. More specifically, the stepping motor 16 has a rotation shaft (drive shaft) 161 extending in parallel with a predetermined radial direction B, and the rotation shaft 161 is provided with a male screw. The tip of the rotating shaft 161 is
It is supported by a hole 132a provided in a bent portion 132 which is erected by cutting and raising. By the hole 132a, the rotating shaft 161 is regulated so as to extend in parallel with the predetermined radial direction B, and its tip is rotatably held. In other words, the hole 132a acts as a bearing for the rotating shaft 161.

On the other hand, the carriage mechanism 15 has an arm 151 extending from the carriage body to the rotation shaft 161. At the tip of the arm 151, a hook portion 151 bent so as to be fitted into a valley portion of a male screw of the rotating shaft 161 is provided.
a. Therefore, when the rotation shaft 161 of the stepping motor 16 rotates, the hook portion 15 of the arm 151 rotates.
1a is moved along the valley portion of the external thread of the rotating shaft 161, whereby the carriage mechanism 15 itself moves in the predetermined radial direction B. Anyway, the stepping motor 16 functions as a driving unit for moving the carriage mechanism 15 in the predetermined radial direction B.

Since the rotating shaft 161 of the stepping motor 16 is provided on one side of the carriage mechanism 15,
One side of the carriage mechanism 15 is movably supported by the rotation shaft 161 while being separated from the frame substrate 13. However, only by the support by the rotating shaft 161, the entire carriage mechanism 15
3 cannot be placed away from the surface. Therefore, the carriage mechanism 1 is mounted on the other side of the carriage mechanism 15.
A device that guides while supporting 5 is required. The guide bar 17 guides this.

The guide bar 17 is provided on the opposite side of the rotation shaft 161 of the stepping motor 16 with the carriage mechanism 15 interposed therebetween. The guide bar 17 extends parallel to the predetermined radial direction B, and has one end 171 and the other end 172 fixed to the surface of the frame substrate 13 to guide the carriage mechanism 15 in the predetermined radial direction B. As a result, the entire carriage mechanism 15 is disposed apart from the surface of the frame substrate 13.

The guide bar 17 is held by a guide bar clamp 18 on the surface of the frame substrate 13. The guide bar clamp 18 is fixed to the surface of the frame substrate 13 by binding small screws 19.

The guide bar clamp 18 merely holds the guide bar 17 therebetween, so that the guide bar 17 cannot be fixed to the surface of the frame substrate 13 by itself. For this purpose, a pair of positioning members for regulating the positions of both ends 171 and 172 of the guide bar 17 are required. As the pair of positioning members, a pair of bent portions 201 'and 202' formed by cutting and raising a part of the frame substrate 13 on the surface side of the frame substrate 13 is used. The pair of bent portions 201 ′ and 202 ′ regulate the positions of both ends 171 and 172 of the guide bar 17, and fix the guide bar 17 to the surface of the frame substrate 13 in cooperation with the guide bar clamp 18.

The carriage mechanism 15 includes a support frame 15 for supporting the carriage body slidably along the guide bar 17.
2 The guide bar 17 is fitted into the support frame 152. Therefore, in this state, when the carriage mechanism 15 slides along the guide bar 17, the support frame 152 comes into contact with the frame substrate 13. In order to prevent this, the guide bar 1 is provided on the frame substrate 13.
An escape portion is formed at a position facing the portion 7. As the escape portion, the frame hole 2 formed in the frame substrate 13 is used.
1 'is used.

The carriage assembly will be described with reference to FIG. The carriage mechanism 15 includes an upper carriage 15-1 and a lower carriage 15-2. Magnetic head chips 153 (corresponding to the magnetic head chip 14 in FIG. 4) and 154 are provided at the distal ends of the upper carriage 15-1 and the lower carriage 15-2, respectively.
Is attached. The magnetic head chip 153 is mounted with the gap part facing downward, and the magnetic head chip 154 is mounted with the gap part facing upward. The mounting structure of the magnetic head chip shown in FIG. 5 is schematically shown, and will be described later in detail. The upper carriage 15-1 is rotatable around the other end, and can be opened upward in FIG. A magnetic disk (not shown) is inserted between the upper carriage 15-1 and the lower carriage 15-2 when the upper carriage 15-1 is open. After the magnetic disk is inserted, the upper carriage 15-1 is moved so that the magnetic head chips 153 and 154 are close to the magnetic disk.
Is closed.

The upper carriage 15-1 is constituted by a plate-like arm. On the other hand, the lower carriage 1
5-2 is a flat plate 1 on which the magnetic head chip 154 is mounted.
5-3, and a projection 15-4 provided at an end opposite to the magnetic head chip 154. The protrusion 15-4 is connected to the upper carriage 15-1 via a metal connection plate 15-5. The projecting portion 15-4 is provided with a spring mounting portion 15-6 projecting rightward in FIG. From the spring mounting portion 15-6, a round bar-shaped spring supporting portion 15-7 protrudes forward in the drawing, and the spring supporting portion 15-7 is used to bias the upper carriage 15-1 downward in the drawing. A spring 15-8 is attached.

[0013] The connecting plate 15-5 is provided with a protruding portion 1 with two screws.
It is fixed by a holding plate 15-9 attached to the upper surface of 5-4. The arm 151 described with reference to FIG. 4 is further formed integrally with the protruding portion 15-4. FIG.
The support frame 152 described in FIG.

Before the magnetic disk is inserted, the upper carriage 15-1 is opened upward by a disk holder plate (not shown). When the magnetic disk is inserted, the disk holder plate moves down. As a result, the upper carriage 15-1 is closed downward by the spring 15-8, and the magnetic head chip 153 approaches the magnetic disk. When the magnetic disk is ejected, the upper carriage 15-1 is kept open upward by the upwardly moving disk holder plate.

The magnetic head chip 153 is fixed to the upper carriage 15-1 by bonding via a gimbal, which will be described with reference to FIG.

The gimbal 155 on which the magnetic head chip 153 is mounted is adhered mainly by applying an adhesive to the boundary between the trailing edge of the gimbal 155 and the main surface of the upper carriage 15-1. When the gimbal 155 is used, positioning is required when the magnetic head chip 153 is mounted on the gimbal 155, and positioning is required when the gimbal 155 is fixed to the upper carriage 15-1.

On the other hand, the magnetic head chip 154 is fixed to the lower carriage 15-2 by directly bonding it to the flat plate 15-3, which will be described with reference to FIGS. The flat plate 15-3 is made of resin, and has a concave portion 15 larger than the magnetic head chip 154 on the upper surface side.
-3a is formed. On the lower surface side of the flat plate 15-3, a concave portion 15-3b similar to the concave portion 15-3a and a groove 15-3 extending from the concave portion 15-3b toward the protruding portion 15-4.
c is formed.

A plurality of (here, five) pin terminals 154-1 are provided on the bottom side of the magnetic head chip 154. Therefore, the concave portions 15-3a and the concave portions 15-3b
Are provided with a plurality of through holes for passing the pin terminals 154-1. A flexible printed circuit board 156 is provided on the side of the recess 15-3b. The flexible printed circuit board 156 is also provided with a plurality of through holes for passing the pin terminals 154-1, and the pin terminals 154 protruding from these through holes are provided.
1 is soldered to the flexible printed circuit board 156. From these soldering points 156-1,
A wiring pattern 156-2 on the flexible printed board 156 passing through the groove 15-3c extends toward the protruding portion 15-4.

[0019]

As described above, when the magnetic head chip 154 is directly mounted on the lower carriage 15-2 without using a gimbal, a thin portion is formed by a concave portion on the flat plate 15-3. Must. This is because it is necessary to pass through the pin terminal 154-1 having a limited length. Moreover. A plurality of through holes for passing the pin terminals 154-1 must be provided in this thin portion. Another problem is that the quality after assembly is not stable.

In view of the above problems, an object of the present invention is to provide a magnetic head chip mounting structure that can simplify the shape of a plate-like member for mounting a magnetic head chip.

[0021]

According to the present invention, there is provided a magnetic head chip mounting structure comprising a carriage mechanism having a magnetic head chip for reading / writing data from / to a magnetic disk mounted on a leading end of a plate-shaped carriage. In the magnetic disk drive provided, the magnetic head chip is attached to a non-conductive substrate on a bottom surface having a plurality of pin terminals, and the plurality of pin terminals are respectively provided in through holes provided in the non-conductive substrate. Is connected to a wiring pattern of a flexible printed board provided on the lower surface side of the non-conductive substrate, and an opening smaller than the non-conductive substrate is provided at the tip end side of the plate-shaped carriage. The non-conductive substrate is fixed to an edge.

The flexible printed board is led out along the lower surface of the plate-shaped carriage.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention will be described with reference to FIGS. 1 to 3 when applied to a lower carriage described with reference to FIG. This embodiment is characterized in that the mounting of the magnetic head chip 154 to the lower carriage is performed via the non-conductive substrate 1. To this end, the magnetic head chip 154 is attached to the non-conductive substrate 1 on the bottom side having the plurality of pin terminals 154-1. Further, a concave portion 15-31 which is larger than the non-conductive substrate 1 is formed in the resin flat plate 15-3 constituting the lower carriage.
5-31 has an opening 15-smaller than the non-conductive substrate 1.
32 are formed. The non-conductive substrate 1 has an opening 15-
The adhesive is fixed on the recesses 15-31 at the edge of the 32.

Each of the plurality of pin terminals 154-1 protrudes from the lower surface through a through hole provided in the non-conductive substrate 1. The flexible printed circuit board 156 is also provided with a plurality of through holes for passing the pin terminals 154-1, and the pin terminals 154 protruding from these through holes are provided.
1 is soldered to the flexible printed circuit board 156. From these soldering points 156-1,
The wiring pattern 156-2 on the flexible printed board 156 passing through the groove 15-33 extends toward the protruding portion 15-4.

The material of the non-conductive substrate 1 is preferably a material having rigidity, for example, a material called SUS.

The mounting of the magnetic head chip in this embodiment is performed as follows. First, the flat plate 1
The non-conductive substrate 1 is bonded to the recess 15-3 of 5-3.
In this case, there is no need to position the non-conductive substrate 1 in the recesses 15-31. Next, the magnetic head chip 154 is set on the non-conductive substrate 1, and after position adjustment, it is bonded. In order to perform the position adjustment, the through-hole for the pin terminal 154-1 provided on the non-conductive substrate 1 is provided with the pin terminal 154-1.
Must be larger than the diameter of Next, the flexible printed circuit board 156 is set on the lower surface side of the non-conductive substrate 1 and soldered through the pin terminals 154-1 in the through holes.

According to the above-described mounting structure, the flat plate 15-3 of the lower carriage 15-2 is provided with the recess 15-.
Only by providing the opening 31 and the opening 15-32, a thin portion and a through-hole for inserting a pin terminal are not required, and the shape of the flat plate 15-3 can be simplified. This means that the quality of the parts is more stable and the quality after assembling is more stable than the structure of directly attaching to the lower carriage 15-2 described with reference to FIGS.

As described with reference to FIG. 5, the magnetic head chip 153 in the upper carriage 15-1 is usually mounted via a gimbal. But,
When it is not necessary to perform the operation via the gimbal, the above-described mounting structure is applied to the magnetic head chip 153 in the upper carriage 15-1. In this case, when performing through a gimbal, as described above, the positioning operation needs to be performed twice, whereas the positioning operation needs to be performed twice. Further, the flexible printed board is led out to the protruding portion 15-4 side along the lower surface side of the upper carriage 15-1.

[0029]

As described above, according to the present invention, the shape of the carriage member for mounting the magnetic head chip can be simplified, and the quality of parts can be stabilized.

[Brief description of the drawings]

FIG. 1 is a plan view for explaining attachment of a magnetic head chip to a lower carriage according to the present invention.

FIG. 2 is a sectional view taken along line AA of FIG. 1;

FIG. 3 is a view of a portion shown in FIG. 1 as viewed from a lower surface side.

FIG. 4 is an exploded perspective view showing a main part configuration of a magnetic disk drive to which the present invention is applied.

FIG. 5 is a perspective view illustrating the conventional carriage assembly shown in FIG. 4;

FIG. 6 is a plan view for explaining attachment of a magnetic head chip to a conventional upper carriage.

FIG. 7 is a plan view for explaining attachment of a magnetic head chip to a conventional lower carriage.

FIG. 8 is a sectional view taken along line BB in FIG. 7;

9 is a view of the portion shown in FIG. 7 as viewed from the lower surface side.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Non-conductive board 15-2 Lower carriage 15-3 Flat board 15-31 Concave part 15-32 Opening 154 Magnetic head chip 154-1 Pin terminal 156 Flexible printed board 156-1 Solder place 156-2 Wiring pattern

Claims (2)

[Claims] 1. A method for reading / writing data from / on a magnetic disk.
In a magnetic disk drive having a carriage mechanism in which a magnetic head chip for performing writing is attached to a tip end side of a plate-shaped carriage, the magnetic head chip is attached to a non-conductive substrate on a bottom side having a plurality of pin terminals. The plurality of pin terminals are respectively connected to a wiring pattern of a flexible printed board provided on the lower surface side of the non-conductive substrate through through holes provided in the non-conductive substrate, and A magnetic head chip mounting structure, wherein an opening smaller than the non-conductive substrate is provided at the leading end side of the carriage, and the non-conductive substrate is fixed to an edge of the opening. 2. The magnetic head chip mounting structure according to claim 1, wherein said flexible printed circuit board is led out along a lower surface of said plate-shaped carriage.