JPS62154314A - Magnetic head - Google Patents

Abstract

PURPOSE:To increase the magnetic body part and improve electromagneric conversion characteristic by providing a magnetic body part in a part of a core for recording and reproducing and using it in common as a part of a magnetic path of an erasing core, and using a magnetic body provided in a part of the erasing core as a part of a magnetic path of the core for recoding and reproducing in common. CONSTITUTION:Non-magnetic body parts 25, 26 are provided in parts of erasing cores 22, 23, and a non-magnetic body part 29 is provided in a part of an R/W core, and other parts are magnetic body parts. the width W1-W3 of the non- magnetic body parts 25, 26, 29 are larger than the maximum wavelength recordable by the magnetic head. Thereby, magnetic fluxes generated from a R/W coil 32 passes through the R/W core 21 and erasing cores 22, 23. These magnetic fluxes join near the non-magnetic body parts 25, 26 and flow to an R/W tap 24. The magnetic flux is branched again near the breaks of non- magnetic body parts 25, 26 and made to a closed magnetic circuit by pack cores 30, 31. Accordingly, the magnetic body part can be increased, and electromagnetic conversion characteristic can be improved very simply.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a laminate type magnetic head used in floppy disk drives and the like.

Conventional technology A conventional laminate type magnetic head is shown in Figs. 6 to 10.
This will be explained with reference to the figures.

Fig. 6 is a perspective view of the external appearance, Fig. 7 is a plan view thereof, and Fig. 8 is a side view of the same.
L-shaped cores la and I made of magnetic material are cores (referred to as
It is composed of a mold core 1b and a core IC made of a non-magnetic material. Reference numeral 2.3 denotes an erasing core, which is composed of L-shaped cores 2a, 3a made of magnetic material, square-shaped cores 2b, 3b, and cores 2c, 3c made of non-magnetic material. 4 is R/W back core, 5.6 is erase back core, 7 is R/~V coil, 8 is erase coil, 9 is R/W gap, 10.1
1 is an erase cap. Further, side views of the R and /W cores 1 and erase cores 2 and 3 are shown in FIG. 9 and FIG. 10, respectively.

The R/W core 1 shown in FIG. 9 is clamped and fixed between the erasing cores 2 and 3 shown in FIG. 5 and 6 are attached to complete what is shown in FIGS. 6 to 8. And when each core is combined, R/W core 1
The magnetic material portion of the erasing core 2.3 and the magnetic material portion of the erasing core 2.3 were separated (defined) from each other.

Problems to be Solved by the Invention In recent years, as magnetic recording devices have become smaller and have higher densities, there has been a demand for smaller track widths and gap dimensions. The reduction in size of the intervening magnetic material portion causes an increase in magnetic resistance, resulting in problems such as a decrease in output and deterioration of saturation characteristics.

Means for Solving the Problems In order to solve the above-mentioned problems, the magnetic head of the present invention includes a non-magnetic material portion having a length equal to or longer than the longest recording wavelength in the vicinity of the recording/reproducing gap in the erasing core that is in contact with the recording/reproducing core. ,
The recording/reproducing core is provided with a non-magnetic part near the erasing cap part, which has a length longer than the longest recording wavelength, and the magnetic part of the recording/reproducing core and the magnetic part of the erasing core are configured so as to be in contact with each other on their sides. It becomes.

Function: A magnetic material part provided in a part of the recording/reproducing core is shared as part of the magnetic path of the erasing core, and a magnetic material part provided in a part of the erasing core is used as a part of the magnetic path of the recording/reproducing core. (shared as a part of the magnetic material), the number of magnetic parts is increased and the electromagnetic conversion characteristics are improved.

Embodiment Hereinafter, a magnetic head according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an external perspective view of a magnetic head according to an embodiment, FIG. 2 is a plan view thereof, FIG. 3 is a side view, FIG. 4 is a side view of the R/W core, and FIG. 5 is an eraser core. FIG.

As shown in the figure, the R/W core 21 and the erase core 22.23
When combined, R/W gap 2 of R/W core 21
A non-magnetic material portion 25, 26 is provided in a portion of the erase core 22, 23 located on the side surface of the eraser core 4, and the other portion is a magnetic material portion. Furthermore, a non-magnetic portion 29 is also provided in a portion of the R/W core located on the side surface of the erase gap 27.28 of the erase core 22.23, and the other portions are magnetic portions.

Widths W1 and W2 of these non-magnetic material portions 25, 26, and 29
．． W3 is longer than the longest wavelength recordable by this magnetic head, so that this portion does not act as a pseudo gap.

Note that 30.31Lt back core, 32 R/W coil, and 33 erase coil.

In FIG. 3, the magnetic flux generated from the R/W coil 32 is transmitted between the R/W core 21 and the erase core 22 as shown by arrows, for example.
．． These magnetic fluxes pass through the magnetic part 23, join near the non-magnetic part 25 and 26 provided in the erase core, and flow into the R/W gap 24. And again the non-magnetic part 25.26
The magnetic flux is shunted from near the break in the back core 30.31
This creates a closed magnetic path. Similarly, the magnetic flux generated by the erase coil 33 passes through the magnetic parts of the erase cores 22 and 23 and the R/W core 21, joins near the non-magnetic part 29 provided in the R/W core 21, and forms the erase gap. 27, 28, merges again near the end of the non-magnetic part 29, and forms the back core 30, 31.
This creates a closed magnetic path. During reproduction, the magnetic flux generated from the media enters through the R/W gap 24 and has a flow similar to that described above.

Effects of the Invention By leaving only a predetermined portion of the conventionally non-magnetic portion as non-magnetic material and making the remaining portion magnetic, it is possible to increase the magnetic material portion and extremely easily. This is extremely useful in practical terms, as it can improve electromagnetic conversion characteristics.

[Brief explanation of drawings]

FIG. 1 is a schematic perspective view of a magnetic head according to an embodiment of the present invention;
Fig. 2 is a plan view of the same, Fig. 3 is a side view of the same, Fig. 4 is a side view of the R/W core used in the same embodiment, and Fig. 5 is a side view of the erase core used in the same embodiment. , FIG. 6 is a perspective view of the appearance of a conventional magnetic head, FIG. 7 is a plan view of the same, and FIG. 8 is a side view of the same.
FIG. 9 is a side view of an R/W core used in a conventional magnetic head, and FIG. 10 is a side view of an erase core used in the conventional magnetic head. 21...R/W core 22.23...Erasing core 24...R/' W gap 25.26.29...Non-magnetic part 27.2B...Erasing gap 30.31...Back core 32...R/W core 33...Elimination core Agent's name Patent attorney Toshio Nakao and one other person Figure 1 Figure 2, X/ Figure 4 Figure 6 figure

Claims (1)

[Claims] In a magnetic head in which an erasing core is provided on both sides of a recording/reproducing core, the erasing core in contact with the recording/reproducing core is provided with a non-magnetic material portion having at least the longest recording wavelength near the recording/reproducing gap, and A magnetic head is constructed by providing a non-magnetic material portion having a wavelength equal to or longer than the longest recording wavelength near the erasing gap portion, so that the magnetic material portion of the recording/reproducing core and the magnetic material portion of the erasing core are in contact with each other at their side surfaces.