JPH0320907Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a mounting structure for a magnetic head, and more specifically to a structure for supporting a magnetic head used in small and thin floppy disk drives. It is something.

BACKGROUND OF THE INVENTION In recent years, floppy disk drives (FDD), which use disk-shaped floppy disks as magnetic recording media, have become popular as external auxiliary storage devices for computer systems.
There are 8-inch and 5.25-inch types of floppy disk devices depending on the size of the floppy disk, and recently a 3.5-inch type has been developed, making it smaller and thinner. The above-mentioned floppy disk device uses one or more magnetic heads to record desired information on one or both sides of a rotationally driven floppy disk, or to record information previously recorded on the floppy disk. or play it.

For example, the mounting structure of the magnetic head in the above-mentioned floppy disk device will be explained with reference to FIGS. 6 to 10. The floppy disk device shown in the figure is a double-sided drive type.
Two magnetic heads are installed on both sides of the disk. That is, as shown in FIG. 6, a floppy disk 1 (hereinafter simply referred to as a disk) inserted into the device is positioned and clamped at a predetermined position, and is equipped with a drive motor (not shown), etc. It rotates at a predetermined number of rotations by a drive mechanism. A pair of opposing head support mechanisms 2, 2 is provided on both the front and back sides of the disk 1, and these head support mechanisms 2, 2 are made of springy stainless steel at the tips of the carriages 3, 3. Magnetic heads 5, 5 are connected to each other via magnetically shielding gimbal plates 4, 4.
It has a structure in which it is attached. These two magnetic heads 5, 5 face each other and simultaneously contact both the front and back surfaces of the disk 1 with a constant pressure during reading and writing.

The gimbal plate 4 is shown in FIGS. 7 to 10.
As shown in the figure, an outer frame portion 4a, an inner frame portion 4b connected to opposing sides of the outer frame portion 4a, and a direction perpendicular to the direction in which the outer frame portion 4a and the inner frame portion 4b are connected. It consists of a head mounting part 4c connected to opposite sides of the inner frame part 4b in the direction, and a magnetic head 5 is fixed to a substantially central portion of the head mounting part 4c. As a result, the magnetic head 5 can be tilted in any of the X and Y directions of the gimbal plate 4, and by providing flexibility to the head support mechanism 2 including the gimbal plate 4, the magnetic head 5 can be tilted. The sliding surface of the magnetic head 5 is brought into stable contact with the disk 1 by following the fluctuation of the disk position due to the deflection of the disk 1 or the like.

FIG. 11 shows the magnetic head 5 attached to the head mounting portion 4c of the gimbal plate 4 with its sliding surface facing down, FIG. 12 is a front view of FIG. 11, and FIG. FIG. 13 is a side sectional view taken along line CC in FIG. 12; The magnetic head 5 is, for example, an eleventh head.
As shown in the figures to FIG. Similar to cores 7 and 7, the abbreviation L is made of ferrite.
The second cores 8, 8 having a letter shape are attached, and the coil 10 is attached to the second core by using the gaps 9, 9 formed between the first and second cores 7, 7, 8, 8 The cores 8, 8 are wound. Also, the first and second cores 7,
By connecting the legs 7a and 8a of 8, the first,
In order to form a loop consisting of the second cores 7, 8, an adhesive 11 is applied to each leg 7a, 7a, 8a, 8a of the first and second cores 7, 7, 8, 8. A back core 12 made of ferrite is joined. This back core 12 and the first and second cores 7, 7,
The legs 7a, 7a, 8a, 8a of the gimbal plate 4 are inserted into the head mounting holes 13 formed in the head mounting portion 4c of the gimbal plate 4.
It is made to protrude from the back side of the plate 4. In addition, 14, 14
are ceramic guard members fixed to the first and second cores 7, 7, 8, 8.

Problems to be Solved by the Invention In the magnetic head mounting structure having the above configuration, each of the leg portions 7a, 7 of the first and second cores 7, 7, 8, 8
Since the back core 12 is bonded to a, 8a, 8a through the adhesive 11, the thickness of the adhesive 11 causes a gap between the first and second cores 7, 7, 8, 8 and the back core 12. There is a problem in that a gap is formed and a complete magnetic loop cannot be achieved, resulting in a decrease in the functionality of the magnetic head. Furthermore, the bonding of the two members using the adhesive 11 was unstable and weak against external forces such as vibrations. Therefore, as one means for solving the above problems, a structure as shown in FIG. 14 has been proposed. As shown in the figure, the first and second cores 7,
The back core 12 is directly joined to the leg portions 7a, 7a, 8a, 8a of the elastic member 1.
5 to elastically press and hold from the outside. Furthermore, in order to prevent the elastic member 15 from detaching, the leg portions 7a, 7a, 8a, 8 of the first and second cores 7, 7, 8, 8 are
a. The back core 12 and the elastic member 15 are molded using a resin material 16 that is as elastic as possible. However, the magnetic head mounting structure having the above structure has a problem in that the elastic member 15 must be attached externally, which increases the number of parts and man-hours.

Means for solving the problems This invention was proposed in view of the above problems.
A part of the flexible gimbal plate used as a support mechanism for the magnetic head is used to maintain the state in which the legs of the first and second cores and the back core are connected. A technical means to solve the problem is to support the magnetic head facing the magnetic recording medium by a flexible gimbal plate, and the magnetic head is attached to the head mounting portion of the gimbal plate. A head mounting hole to be inserted is drilled, and the first and second tongue pieces formed on the opposing peripheral edges of the head mounting hole are made to stand up on the back side of the gimbal plate, and then inserted into the head mounting hole. The first tongue piece is brought into contact with the core leg portion of the magnetic head disposed on the back side of the gimbal plate, and the second tongue piece is elastically pressed into contact with the back core connecting the core leg portion. A core leg portion and a back core are sandwiched between the first and second tongue pieces, and the core leg portion, back core, and first and second tongue pieces are molded with a relatively elastic resin material. This is what I did.

Operation By using the above-mentioned technical means, the first tongue piece positions the core leg of the magnetic head, and the second tongue piece is brought into elastic pressure contact with the back core. The core legs and the back core are sandwiched between the pieces to ensure that the back core is joined to the core legs.

Embodiments Hereinafter, embodiments of the magnetic head mounting structure according to the present invention will be described with reference to FIGS. 1 to 5. FIGS. 1 to 4 show an embodiment of the present invention, and the same reference numerals as in FIGS. 11 to 14 indicate the same parts, and the explanation thereof will be omitted. A feature of the present invention is the gimbal plate 4'. As shown in FIG. 1, the first and second cores 7, 7, 8, By inserting the leg parts 7a, 7a, 8a, 8a of the first and second cores 7, 7, 8, 8 on the back side of the head mounting part 4c', the leg parts 7a, 7a, 8a, 8a of the first and second cores 7, 7, 8, 8 are inserted
The first and second cores 7,
The back core 12 connecting the legs 7a, 7a, 8a, 8a of the first and second cores 7, 7, 8, 8 is directly connected to the legs 7a, 7a, 8a of the first and second cores 7, 7, 8, 8 without using an adhesive.
7a, 8a, 8a, and in this state, attach the magnetic head 5 to the head mounting portion 4 of the gimbal plate 4'.
Attach to c′.

As shown in FIG. 2, the head mounting portion 4c' of the gimbal plate 4' has the above-mentioned head mounting hole 13 formed in the approximate center thereof, and the head mounting hole 13 is formed in the opposing peripheral edge of the head mounting hole 13. first tongue piece 17,
17, 17 and second tongue pieces 18, 18 are formed. The length l 1 of this second tongue piece 18 is the length _{l 1} of the first tongue piece 1
7 is set to be longer than the length _l2 . As shown in FIG. 3, the first tongue piece 17,1
7, 17 and the second tongue pieces 18, 18 are bent toward the back side of the head attachment portion 4c' of the gimbal plate 4' and held upright. At this time, the first tongue piece 17,
17, 17 and the second tongue pieces 18, 18 are made to stand up substantially vertically, and the tip of the second tongue piece 18 is further bent outward to form a dogleg shape. 18 and 18 have a spring structure. By inserting the first and second cores 7, 7, 8, and 8 of the magnetic head 5 into the head mounting holes 13 of the head mounting portion 4c' of the gimbal plate 4' as described above, 1. Attach the leg portions 7a, 7a, 8a, 8a of the second cores 7, 7, 8, 8 to the head mounting portion 4.
c' and the leg portions 7a, 7a, 8a, 8a of the first and second cores 7, 7, 8, 8.
The back core 12 is joined to the legs 7a, 7.
a, 8a, 8a and the back core 12 are held between the first tongue pieces 17, 17, 17 and the second tongue pieces 18, 18. The first tongue pieces 17, 17, 17 are the legs 7a, 7 of the first and second cores 7, 7, 8, 8.
a, 8a, 8a and the leg portions 7a, 7a, 8
a, 8a are positioned, and the second tongue pieces 18, 18 are elastically pressed into contact with the back core 12 to securely join the back core 12 to the first and second cores 7, 7, 8, 8. to hold. As described above, the first tongue pieces 17, 17, 17 and the second tongue pieces 1
First and second cores 7, 7, 8, 8 between 8 and 18
The legs 7a, 7a, 8a, 8a and the legs 7a, 7
A, 8a, 8a and the back core 12 joined to them are sandwiched, and as shown in FIG. 4, these are molded with a resin material 16' having relatively high elasticity.

In the above embodiment, an example was explained in which the magnetic head 5 has a structure in which the coil 10 is disposed on the surface side of the head mounting portion 4c' of the gimbal plate 4'.
The present invention is not limited to this, for example, the fifth
As shown in the figure, the present invention is also applicable to a magnetic head 5' having a structure in which a coil 10' is disposed on the back side of a head mounting portion 4c' of a gimbal plate 4'.

Effects of the invention According to the invention, the core legs and back core of the magnetic head can be removed while the core legs and back core of the magnetic head are directly connected to each other without using an adhesive using a part of the gimbal plate. Since the core legs and the back core are elastically pressed and clamped from both sides, the connection between the core legs and the back core is stable, and a complete loop is formed, so the magnetic head characteristics are not deteriorated and the installation of the magnetic head is very easy. This makes it easier to implement automation. Further, unlike the conventional method, there is no need for an externally attached elastic member, so the number of parts is reduced and the number of man-hours can be reduced.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an embodiment of a magnetic head mounting structure according to the present invention, FIG. 2 is a plan view showing a head mounting portion of a gimbal plate used in an embodiment of the present invention, and FIG. The figure is a perspective view showing the state in which the first tongue piece and the second tongue piece formed on the head attachment part of the gimbal plate are bent and molded, and Figure 4 shows the back side of the head attachment part of the gimbal plate being molded with resin. FIG. 5 is a front view showing another embodiment of the present invention. FIG. 6 is a sectional view showing an example of a magnetic head support mechanism in a floppy disk device, FIG. 7 is a perspective view showing an example of a gimbal plate, FIG. 8 is a plan view of FIG. 7, and FIG. A sectional view taken along the line A-A in Figure 8, and Figure 10 is a cross-sectional view of the
11 is a perspective view showing an example of a conventional magnetic head mounting structure; FIG.
The figure is the front view of Fig. 11, and Fig. 13 is the C of Fig. 12.
FIG. 14 is a side sectional view taken along the line -C, and a front view showing another conventional example of a magnetic head mounting structure. 4, 4'... Gimbal plate, 4c'... Head mounting part, 5, 5'... Magnetic head, 7, 8...
First and second cores, 7a, 8a...first and second core legs, 12...back core, 13...head mounting hole, 17...first tongue piece, 18...second Tongue piece.

Claims (1)

[Scope of utility model registration request] A magnetic head is supported facing a magnetic recording medium by a gimbal plate having spring properties, and a head mounting hole into which the magnetic head is inserted is bored in the head mounting portion of the gimbal plate, and The first and second tongues formed on the opposing peripheral edges of the head mounting hole are made to stand up on the back side of the gimbal plate, and are inserted into the head mounting hole, thereby allowing the magnetic head placed on the back side of the gimbal plate to stand up. The first tongue piece is brought into contact with the core leg part of the back core, and the second tongue piece is brought into contact with the back core that connects the core leg part.
A mounting structure for a magnetic head, characterized in that the core legs and the back core are sandwiched between the first and second tongues by elastically pressing the tongues into contact with each other.