JPH042410Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field This invention relates to a magnetic head used in a magnetic recording device such as an FDD (floppy disk drive), and particularly relates to a technology related to the core structure thereof.

BACKGROUND TECHNIQUE Generally, a magnetic head used in an FDD, as introduced in Japanese Patent Application Laid-open No. 58-98825, consists of an R/W core that serves as a R/W head section and an erase core that serves as an erase head section. , are joined and integrated. Furthermore, regarding the manufacturing of the magnetic head core, Japanese Patent Application Laid-open No. 1983-
Various efforts have been made, including those published in Japanese Patent Application Laid-open No. 100218 and Japanese Patent Application Laid-Open No. 179930/1983. There are generally two types of magnetic head cores: tunnel erase type and straddle erase type, but the former is the most popular because it has good productivity, easy cost reduction, and excellent off-track performance with diskettes. is occupying.

Therefore, the tunnel erase type magnetic head core is roughly explained as follows. That is, the second
As shown in the figure, the R/W head section 1 is constructed by abutting a center core 4 and a side core 5, which have track grooves 2, 2 and 3, 3, respectively, and forming an R/W gap 6.
was formed. Incidentally, numerals 7 and 7 are glasses that are molded into the respective track grooves 2, 2, 3, and 3 and serve as gap protection and adhesive. Next, the erase head section 8 includes a center core 9 and a side core 10.
Track grooves 11, 11 for setting the track width of the R/W gap, and track grooves 12, 12, 13, 13 similar to those of the R/W head are provided and butted to erase both ends of the recording medium track. Erase tracks 14 and 15 are formed respectively. Reference numeral 16 denotes a non-magnetic substrate on which the R/W head section 1 and the erase head section 8 are bonded together on both sides with an adhesive or the like.

Problems that the invention attempts to solve By the way, the magnetic head for FDD described above is
There are the following problems in forming the erase gap. That is, in FIG. 2, the R/W track width T is determined by cutting the track grooves 11, 11. However, when the track grooves 11, 11 are formed by cutting, the thickness of the cutting dicer blade has a considerable deviation, and there is a limit to the dimensional accuracy. Furthermore, it is difficult to accurately position the core in the thickness direction.

This invention is proposed for the purpose of eliminating the above-mentioned drawbacks.

Means for Solving the Problems This invention has the background described above, and the R/W head section having the R/W gap and the erase head section having the erase gap are arranged on a straight line separated by a certain distance and joined together. In this magnetic head, the erase head portion is characterized by assembling and fixing a plurality of core base materials each having an erase gap at a different position. Therefore, the magnetic head according to this invention can eliminate the need for the central track groove that was conventionally formed between the erase gaps and determined the R/W track width T.

Function: In this invention, each core base material is provided with each erase gap, and is assembled and fixed to form an erase head.
Since the core base material having each erase gap corresponding to both ends of the recording medium track is separately formed, assembled and fixed, there is no need to provide a central track groove that has conventionally been required to be formed between the erase gaps. That is, in this invention, the erase gap structure can also be basically formed using the same method as the R/W. That is, the inner end of the erase gap (the center line of the media track is inward) can be determined by the track groove cut in the thickness direction of the core plate.

Embodiment FIG. 1 is a plan view of a magnetic head core for an FDD showing an embodiment of this invention, and the same figure numbers as in FIG. 2 showing a conventional one have the same designations, so redundant explanation will be avoided. Further, reference numeral 20 denotes an erase head section which is the gist of this invention, and is made by gluing together a first structure 21 and a second structure 22, which have exactly the same structure, alternately, so the same name is indicated by the same figure number.
That is, 23 and 24 in the first and second structures 21 and 22 are core base materials, and the erase gap 25
In order to set the large track grooves 26, 27
and forming small track grooves 28 and 29,
Like the R/W head part, it is made of molded glasses 7, 7. And 30 is an adhesive.

The magnetic head core having the above structure has a core base material 2
Both ends of the track width T can be set by the dimension D of the large track grooves 26 and 27 which are cut along the plate thickness direction at 3 and 24. Therefore, in this magnetic head core, unlike the conventional core shown in FIG. 2, there is no need to form central track grooves 11, 11, and the R/W track width can be set accurately.

Effects of the invention According to this invention, the R/W track width can be set accurately, and the formation of track grooves in the core base material is relatively simple, and reliability is significantly improved. Also, according to this invention, since the erase tracks with their respective erase gaps are housed in symmetrical positions with respect to the track center line, tracking can be adjusted accurately even if the magnetic head is off-track with respect to the diskette track. , it is possible to achieve better characteristics than conventional ones.

[Brief explanation of the drawing]

Fig. 1 is a plan view of a magnetic head core for FDD showing an embodiment of this invention, and Fig. 2 is a plan view of a conventional magnetic head core.
FIG. 3 is a plan view of a magnetic head core for FDD. 1...R/W head part, 4...Center core, 5
...Side core, 6...R/W gap, 20...
...Erase head section, 21...First structure, 22...
...Second structure, 23, 24...Core base material, 25...
Erase gap, 26, 27, 28, 29...
Track groove.

Claims (1)

[Claims for Utility Model Registration] In a magnetic head in which an R/W head having a R/W gap and an erase head having an erase gap are arranged and joined on a straight line separated by a certain distance, the erase head has the following features: A magnetic head characterized in that a plurality of core base materials each having an erase gap at a different position are assembled and fixed.