JPS62145568A - Magnetic head device for floppy disk - Google Patents

Abstract

PURPOSE:To improve the follow-up property of a head mounting part by constituting the bridge part to link the head mounting part of a gimbal and the frame body through a slit to the circumference at two places, which comes to be symmetrical with the magnetic head as the center, as a pair of two bridge parts respectively, and dispersing and absorbing the reaction received from the disk surface with respective bridge parts. CONSTITUTION:For a magnetic head 11, in accordance with the assembling error such as a carriage or the reaction as shown in an arrow B received accom panying the rotation of a disk, the head surface position and the angle are changed. For such a reason, a head mounting part 22 of a gimbal 21 is changed together with the twisting of respective bridge parts 26a, 26b, 27a and 27b in accordance with the change of the magnetic head 11. In such a case, since respective bridge parts 26a, 26b, 27a and 27b are constituted as the bridge part composed of a pair of two arms, the twisting is dispersed and absorbed for respective arms 26a, 26b, 27a and 27c, and the follow-up property of the mag netic head 11 surface to the change of the disk surface obtains sufficient flexibil ity.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention is directed to a floppy disk, which is formed by applying a magnetic material to a thin disc-shaped base, as an input/output terminal for reading and writing information. The present invention relates to a magnetic head device for a floppy disk.

[Technical Background of the Invention] In general, a 70-tube disk drive device (hereinafter referred to as FDD) writes and reads information by bringing a magnetic head made of a material such as ferrite into contact with a rotating floppy disk. ing. As mentioned above, the floppy disk is made of a disk-shaped plastic sheet with a thickness of about 80 μm coated with a magnetic material, and has extremely flexible properties. On the other hand, a magnetic head has a coil wound around a magnetic core with a gap of about 2 μm in width, and when a current is passed through this coil, the magnetic flux leaking from the gap is used to direct the magnetic head towards the magnetic surface of the floppy disk. Information is recorded magnetically on the magnetic surface, and the information is read by detecting changes in the magnetic force received from the magnetic surface. Therefore, in order to read and write accurate information,
An important point is how stably the magnetic head can make contact with the rotating flexible floppy disk.

As shown in the second factor, the normal magnetic head 11 is attached to an extremely thin metal plate called a gimbal 12. This gimbal 12 consists of a central head support part 12a, a frame body 12b surrounding the periphery via a slit, and bridge parts 13a, 13t) that connect these two parts. is fixed to a carriage (magnetic head holding component) 14 as shown in FIG. 3 and incorporated into the FDD.

FIG. 3 shows upper and lower surfaces 15a and 15 of the floppy disk 15.
Fig. 2b shows an FDD in which individual magnetic heads 11a and 11b are set, and the magnetic head 11a in this FDD.

The setting position of the floppy disk 11b is normally based on the lower surface 15b side of the floppy disk 15.
After setting, the upper magnetic head 11a presses the disk surface 15a in the direction shown by the arrow A, thereby causing both the upper and lower heads 11a to move.

11b are brought into close contact with the respective disk surfaces 15a, 15k). Therefore, in this case, the cymbal 12 is designed so that the upper magnetic head Ila moves more flexibly than the lower magnetic head Ila.

Here, when the FDD shown in FIG. 3 is put into use, the upper magnetic head 11a is pressed against the disk surface 15a depending on the inclination of the carriage 14, and the head mounting portion 12a of the gimbal 12 and the frame 12b are pressed against each other. A connecting bridge portion 13a.

They are brought into close contact by a twisting action using 13b as a fulcrum.

In this case, since the floppy disk 15 is always in a rotating state, the position of the head surface must be slightly changed in response to fluctuations in the reaction force received from the disk surface as shown by arrow B. For this reason, the slit area between the head mounting part 12a and the frame body 12b of the gimbal 12 is changed into various shapes so that the head mounting part 12a can flexibly move with the movement of the magnetic head 11 without losing its strength. The design has been changed.

[Problems with the Prior Art] However, the fluctuation in the inclination of the floating disc 15 is not limited to that caused by its rotation, and the assembly of the carriage 14 is also affected by the condition or dimensional error. With the holding structure of the magnetic head 11 as described above, it is not necessarily possible to obtain sufficiently stable contact with the floppy disk 15. Therefore, each FD
D, for example, by applying stress to the wiring material connected to the magnetic head 11, and intentionally deforming the inclination of the head mounting portion 12a as shown in FIG.
The head surface angle is made to correspond to that of 5.

[Object of the invention] This invention was made in view of the above problems.
For example, even if there is an error in the inclination of the disk surface for each FDD, there is no need to correct the gimbal part, and a reliable contact state between the floppy disk and the magnetic head surface can be obtained. The purpose of the present invention is to provide a magnetic head device.

[Summary of the Invention] That is, a magnetic head device for a floppy disk according to the present invention connects a head mounting portion of a gimbal and a frame with a slit around the gimbal at two points that are symmetrical with the magnetic head in the center. Each of the bridge sections is configured as a set of two bridge sections, and the followability of the head mounting section is improved by dispersing the reaction force received from the disk surface.

[Embodiments of the invention] An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows its configuration, and in the figure, reference numeral 11 denotes a magnetic head that comes into contact with the floppy disk surface. The magnetic head 11 is mounted at approximately the center of the head mounting portion 22 of the gimbal 21.

This gimbal 22 is formed, for example, by punching a rectangular extremely thin metal plate, and includes a U-shaped slit area 23a formed along two sides that are symmetrical in the longitudinal direction; 23b, and small elliptical slit regions 24a and 24b formed along the center line of symmetry thereof.
Accordingly, the head mounting section 22, a frame 25 surrounding the head mounting section 22, and bridge sections 26a, 26b, 27a, connecting the head mounting section 22 and the frame 25,
27b. These bridge parts 26a, 26
b, 27a, and 27bGt are each provided in pairs in two locations symmetrically with the magnetic head 11 in the center, and the head mounting portion 22 is made flexible with respect to the frame 25. to hold the position. And this magnetic herad 1
Attach cymbal 21 loaded with 1 to the carriage and FD
Configure it into D.

In other words, in the magnetic head device configured as described above, when reading and writing information to and from a floppy disk, the magnetic head 11 is mounted with the carriage etc. due to errors and errors.
Alternatively, the position and angle of the head surface vary depending on the reaction force as shown by arrow B in FIG. 3, which is received as the disk rotates. Then, the head mounting portion 22 of the gimbal 21 changes as the bridge portions 26a, 26b, 27a, and 27b twist in accordance with the movement of the magnetic head 11. In this case, each bridge portion 26a.

Since the arms 26b, 27a, and 27b are configured as a bridge section consisting of a pair of arms, the torsion caused by the fluctuation of the head mounting section 22 can be avoided by the arms 26a, 26b, and 27b, respectively. 27a.

As a result, the magnetic head 11 has sufficient flexibility to follow fluctuations in the disk surface. Further, the twisting of the head mounting portion 22 with respect to the frame body 25 may be caused by
a, 26b, 27a.

By being dispersed and absorbed at 27b, the head mounting section 2
Even if 2 has sufficient fluctuation flexibility, there is no fear that its position holding strength will be lost.

Therefore, while maintaining the connection strength between the frame body 25 and the head mounting portion 22 in the gimbal 21, sufficient contact followability of the magnetic head 11 with respect to the floppy disk surface can be obtained, which is different from the conventional example described above. Each FDD like
It is possible to reliably write and read information to and from a floppy disk without having to correct the position of the magnetic head every time.

[Effects of the Invention] As described above, according to the present invention, the bridge portion connects the head mounting portion of the gimbal and the frame with a slit around the gimbal at two symmetrical locations with the magnetic head in the center. are configured as a set of two bridge sections for each, and each bridge section disperses and absorbs the reaction force received from the disk surface, improving the followability of the head mounting section. We have developed a magnetic head device for floppy disks that makes it possible to obtain reliable contact between the floppy disk and the magnetic head without the need to correct the gimbal part even if there is an error in the inclination of the disk surface. Can be provided.

[Brief explanation of drawings]

FIG. 1 is an external configuration diagram showing a magnetic head device for a floppy disk according to an embodiment of the present invention, FIG. 2 is an external configuration diagram showing a conventional magnetic head device, and FIG. 3 is a floppy disk of the above magnetic head device. A diagram showing the state of contact with
FIG. 4 is a diagram showing a twisted state of the bridge portion in the conventional magnetic head device shown in FIG. 2. 11...Magnetic head, 14...Carriage, 15.
...70 Tupidisk, 21...Gimbal, 22...
・Head mounting part, 23a, 23b, 24a, 24b-2
Rit area, 25 --- Frame, 26a, 26b, 27
a, 27b...Bridge part. Applicant's representative Patent attorney Takehiko Suzue Figure 1 Figure 2 Figure 3 Figure 12:a Figure 4

Claims (1)

[Claims] In a magnetic head device consisting of a magnetic head that contacts the surface of a floppy disk and a gimbal on which the magnetic head is mounted, the head mounting portion of the gimbal and a frame with a slit around it are arranged with the magnetic head in the center. A magnetic head device for a floppy disk, characterized in that two symmetrical locations are connected by a pair of bridge portions.