JPS60115007A - Magnetic head - Google Patents

Abstract

PURPOSE:To ensure the smooth drive of a magnetic tape with reduction of noises for a magnetic erasion head by using a molded material having the sheet resistance smaller than the prescribed value and added with carbon fibers and carbon black as an antistatic agent to unify the tape rubbing side of a magnetic head with a case. CONSTITUTION:An antistatic agent of carbon fibers and carbon black as well as an inorganic filler such as alumina, CaCO3, etc. are added to a binder such as nylon, ABS, etc. to obtain a molded material having the sheet resistance value set at <=10<10>OMEGA/cm<2>. Then the rubbing side of a magnetic head to a magnetic recording medium is unified with a case main body 10 to obtain a magnetic erasion head containing a head part 11 and a gap part 12 incorporated to the case with the internal molding resin 13. Thus the smooth tape drive is secured with reduction of noises.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention is an erasing head for audio signals such as v-T/R, in which a case body constituting the erasing head and a tape sliding surface are integrally molded. This invention relates to a magnetic head made by adding carbon fiber and carbon black, which are antistatic agents, to a molding material.

<Prior Art> Conventionally, as shown in FIG. 1, in a magnetic head, a fitting part 2a is formed in a case body 2 into which a head part consisting of a coil, a front core, and a bank core is assembled, and a fitting part 2a is formed so as to be inserted from the back side. The tip of the front core 1a of 1 is the case body 2
A front block 3 made of a ceramic or inorganic filler molding material is placed on the tape sliding contact surface 2b side of the case body 2 so as to be accurately positioned on the tape foil contact surface 2b.
is embedded integrally, and after the head part 1 is assembled and an internal mold is applied, the tape sliding surface 2b is polished into a predetermined arc shape, and a magnetic head as shown in Fig. 2 is manufactured. It had been.

However, since the molding material of the front block 3 does not contain an antistatic agent as an antistatic measure, it has high external insulation properties, and the friction between the magnetic tape and the tape sliding surface , static electricity was generated, which deteriorated tape running and caused noise. In particular, the higher the insulating properties of the molding material for the front block 3, the higher the amount of charge, and the higher the area resistance (t%).When the amount of charge reaches a certain value or more, it discharges and makes noise. There were drawbacks such as increasing the amount of water.

Means for Solving the Problems> The present invention has been made to solve the above-mentioned conventional drawbacks, and as a measure to prevent static electricity from forming on the tape sliding surface of the magnetic head. Carbon fiber and carbon black, which are antistatic agents, are added to the molding material made by integrally molding the case body and the tape sliding surface of the head part, and the sheet resistance value of the molding material is increased to 10'.
. [Case] The present invention provides a magnetic head as follows.

<Embodiments of the Invention> Hereinafter, embodiments of the present invention will be described based on FIG. 3. In the figure, 10 is a case body molded integrally with the tape sliding surface, 11 is a front core of a head portion, 12 is a gap, 13 is a molded resin, and 14 is a terminal.

The basic constituent material of the case body 10, which is molded integrally with the tape sliding surface, is plastic (e.g., nylon, polyphenylene sulfide, polybutylene terephthalate).
), ABS resin, etc.), inorganic fillers (e.g. alumina, calcium carbonate, quartz glass, etc.), and antistatic agents of carbon fiber and carbon black are added, and the sheet resistance value is set to 10100 or less when running the tape. Static electricity caused by friction is prevented.

Furthermore, if the inorganic filler in the basic constituent materials is too small, problems will arise in the abrasion resistance during tape running, so it is desirable that the weight ratio of plastics/inorganic filler be 315 or less.

Furthermore, the carbon fiber added to the above material has a bending strength and tensile strength of the material equivalent to or higher than that of conventional glass fiber. It is finely divided carbon obtained by

As explained in detail above, in the magnetic head according to the present invention, the molding material for integrally molding the case body constituting the erasing head and the tape sliding surface of the head portion is made of plastics or inorganic filler. The molding material is made of a material to which appropriate amounts of carbon fiber and carbon black are added as antistatic agents, and the sheet resistance value of the molding material is 1o"('jQ
] The amount of charge on the p1 tape sliding surface is reduced, the tape runs smoothly, the generation of noise is reduced, and the performance as an erasing head is improved.

[Brief explanation of the drawing]

1 and 2 are exploded structural views of a magnetic head showing a conventional embodiment and a perspective view after assembly is completed, and FIG. 3 is a perspective view of a magnetic head according to the present invention. 10...Case body, 11...Head part, 12...
・Gap, 13-...Mold resin. Patent applicant: TDC Co., Ltd. Agent: Hideaki Tosa, patent attorney

Claims (1)

[Claims of Claims] In an erasing head using a molded product as a sliding surface, an antistatic agent for preventing static electricity is added to a molding material formed by integrally molding a case body constituting the erasing head and a tape sliding surface. 1. A magnetic head characterized in that carbon fiber and carbon black are added to the molding material, and the area resistance value of the molding material is ft1010 or less.