JPS61199211A - Fixed type floppy head - Google Patents

Abstract

PURPOSE:To reduce the number of parts to improve the yield by burying a head unit in a housing consisting of a resin composition containing a wear resisting filler. CONSTITUTION:A joined body of a read-write core 21 consisting of a ferrite or the like and a supporting body 85 consisting of nonmagnetic ceramics like a barium titanate is laminated with joined bodies of erase cores 251 and 252 and supporting bodies 811 and 812, which consist of the same kind of materials, between them. Windings 31 and 35 are wound around these cores, and back bars 51 and 55 are provided, and this head unit is adhered to a housing. The housing 7 is a truncated quadrangular pyramid having a flat sliding surface 11 and a groove 115, and an insertion hole 25 of a cavity part for head unit insertion is provided on the sliding surface 11, and the head unit is inserted to this insertion hole 25 and is adhered. The groove 115 is formed on the sliding surface 11 for the purpose of reducing friction, and a plate 9 is stuck to the rear end face of the housing 7.

Description

[Detailed Description of the Invention] ■ Blue Tatami Technical Field of the Invention The present invention relates to a fixed floppy head for recording, reproducing, and erasing information on a flexible recording medium used in, for example, word processors and personal computers. For example, it is used in conjunction with a gimbal-type floppy head.

PRIOR ART Fixed floppy heads for recording, reproducing, and erasing information on flexible recording media have been designed to suit the drives of various manufacturers, and various types have been proposed.

Recently, in order to be able to read and write on both sides of a disk-shaped flexible recording medium, two floppy heads are placed above and below the recording medium in a mirror image relationship, and the two floppy heads are slid on both sides of the recording medium to read and write. It is common that

In this case, in order to moderate the sliding pressure on the surface of the recording medium, the upper of the two floppy heads used is often a so-called gimbaled floppy head, and the lower is a fixed floppy head.

The basic characteristics required for such a floppy head are:
However, recently, efforts have been focused on reducing the cost of the final product by improving productivity and reducing component costs without compromising product balance. ing.

An example of a conventional fixed floppy head structure is shown in FIGS. 3 and 4.

This is a tunnel erase type flow bee head, usually called a laminate type, which is an integrated body of the read/write head 21 and the non-magnetic chip support 85, and an integrated body of the erase head 251 and the non-magnetic chip support 811. erase head 252 and non-magnetic chip support 8
The three layers of the integrated body with 12 are laminated and integrated,
Both sides in the longitudinal direction are further sandwiched and fixed by sliders 41 and 45.

Further, a plate 9 is fixed to the upper surface of the slider 41, 45 shown in FIG.

More specifically, the read/write head 21 has a gap 211 at the front portion that makes sliding contact with the magnetic recording medium. Further, the read/write head 21 includes a side core portion 21 of two pieces of wood extending upward and connected at right angles to this sliding surface.
It has a U-shaped core chip shape with 11°2112.The two side cores 2111°2112 are fixedly connected to the back par 51 to form a closed magnetic circuit. Further, a predetermined read/write winding 31 is wound around one outer core 2111. Furthermore, this read/write head 21 is provided with a non-magnetic chip support 85 in series.
are integrated.

On the other hand, the two erase heads 251 and 252 also have a similar U-shaped core chip shape, and are integrated with nonmagnetic chip supports 811 and 812, respectively. Then, with the non-magnetic chip support 85 integrated with the read/write head 21 sandwiched therebetween, the side core portions 2511 and 251 of the two erase heads 251 and 252 are
2 (the remaining two trees are visible in the figure and are inner) are fixed and connected by the back par 55. Furthermore, the side cores 2511 and 2512 have erase head windings 35.
is wound.

When manufacturing such a fixed type floppy head, there are disadvantages such as high component cost and low work efficiency and product yield due to the large number of assembled parts.

Furthermore, the non-magnetic chip 85°811.812
For the sliders 41 and 45, non-magnetic ferrite, barium titanate, etc. are used in consideration of functionality, especially wear resistance, but these materials are complicated to manufacture and require grinding and grinding during secondary processing. Polishing is not easy, and the manufacturing process is also complicated, resulting in high costs.

On the other hand, it is also possible to use a housing in which the slider portion is integrated with various resins such as polyacetal, which can be injection molded and are easily manufactured.

However, these molded members have poor wear resistance, have poor grindability during secondary processing, and have scum attached to the ground end surface. So-called beards occur frequently.

Therefore, a fixed floppy head using a housing in which a slider part is integrated from a resin molded body has not yet been put into practical use.

II. Purpose of the Invention The purpose of the present invention is to have good grinding and polishing properties during secondary processing,
Excellent wear resistance. It is an object of the present invention to provide a fixed type floppy head which has a resin housing with an integrated slider part and is inexpensive to manufacture.

■Disclosure of invention Such objects are achieved by the invention described below.

That is, the present invention has the following features: Iil! + Resin composition containing an abrasive filler I＼
A fixed type floppy head characterized by a head unit embedded within the housing.

■Specific structure of the invention A specific configuration of the present invention will be explained in detail below.

1 and 2, an embodiment of the invention is shown.

In the illustrated example, the head unit used is a so-called normal laminate type tunnel erase type head unit.

That is, the read/write core 21 made of ferrite or the like and the support body 85 made of a non-magnetic ceramic such as barium titanate are combined into erase cores 251 and 25 made of the same material as these.
2 and supports 811 and 812 are stacked with the joined body sandwiched therebetween. That is, in the present invention, a slider is not used in the head unit ( ) as in the conventional case.

Note that, unlike the one shown in FIG. 1, a so-called bulk type tunnel erase type eraser can also be used. In addition, erase cores 251 and 252 and supports 811 and 81
The combination with 2 is.

It is also possible to use only one or omit it.

Such a head core ultimately has a winding of 31.35
, and is permanently attached to the housing 2, which will be described later, with backpers 51 and 55 attached as necessary. However, unlike conventional models, a separate slider is not fixed to the head unit.

The housing 7 used has a flat sliding surface 11 as shown in the figure.
It is preferable that the shape is approximately a truncated quadrangular pyramid having a groove 115 and a groove 115.
In addition, various shapes such as a rectangular parallelepiped shape may be used.
As shown in FIG. 3, the sliding surface has an insertion lower 5 which is a cavity for inserting the head unit.

As shown in FIGS. 1 and 2, a head unit is inserted into the lower input portion 5 of the housing 7 and bonded thereto.

Then, as shown in FIG.
5 and the head is manufactured.

Note that the sliding surface 11 has grooves 11 to reduce friction.
5 is formed.

A plate 9 is fixed to the rear end surface of the housing 7.

Such housing 7 is formed from a resin composition containing a wear-resistant filler.

Although various resins can be used, thermoplastic resins such as polyphenylene sulfide, thermosetting resins such as phenol resin, polysia phthalate, and epoxy resin are particularly suitable.

Such resins include wear-resistant fillers.

By adding the wear-resistant filler, uneven wear of the head is prevented.

Suitable wear-resistant fillers include silica, quartz glass, alumina, etc., and their shapes can be various, such as granules, crushed pieces, scales, and fibers.

However, under these circumstances, the average particle size is 30 to 150 ILm.
Silica and quartz glass exhibit the highest wear resistance.

Such a wear-resistant filler has a ratio of 50 to 9 to the resin.
Contained at 0% by weight.

If it is less than 50%, the wear resistance is insufficient.

If it is more than 90%, moldability and processability are insufficient.

Furthermore, in addition to this wear-resistant filler, it is preferable that an antistatic agent is contained.

Thereby, charging spark noise due to disk running can be prevented.

As the antistatic agent, various known antistatic agents can be used, but carbon fillers in the form of particles, scales, fibers, etc. are particularly suitable.

Note that the antistatic agent is contained in an amount of 1 to 6% by weight based on the resin.

In addition, the resin composition also contains lubricants and stabilizers.

A coloring agent, an antifoaming agent, etc. can be contained.

(2) Specific Effects of the Invention According to the present invention, unlike the conventional slider, a slider made of barium titanate or the like is not used, so the number of parts can be reduced and the cost of parts can be reduced. Furthermore, since the slider adhesion process and the slider grinding/polishing process are eliminated, productivity is significantly improved, yields are good, and manufacturing costs are reduced.

Moreover, it still exhibits the same wear resistance as conventional products.

In fact, when we fabricated the fixed floppy head shown in Figure 1 from 1 part by weight of polyphenylene sulfide resin and 2 parts by weight of silica, we found that the wear amount was less than 0.51 Lm even after 3 million passes, just like the conventional one. there were.

[Brief explanation of the drawing]

1 and 2 are a perspective view and a plan view, respectively, showing an embodiment of the present invention. FIGS. 3 and 4 are a perspective view and a plan view, respectively, of a conventional fixed floppy head. Explanation of symbols 11...Sliding surface. 21... Read/write core, 81.811,812... Support body, 251.252... Erase core. 7...Housing. 9...Plate FIG, 2

Claims (1)

[Claims] (1) A fixed floppy head characterized in that a head unit is embedded in a housing made of a resin composition containing a wear-resistant filler.