JPH03214406A - Magnetic head - Google Patents

Abstract

PURPOSE:To prevent the reading out of the signals of adjacent tracks by the deviation of a recording medium by forming a core for reading out to the width narrower as furtherer from a magnetic gap. CONSTITUTION:The core width of the read core 2a is formed to a tapered shape narrower as furtherer from the gap 5, by which the magnetic resistance between the lead core 2a and side cores 3, 3 is increased larger than heretofore, by which the magnetic influence of the side cores 3 to pickup the signals of the adjacent tracks is no longer received by the read core 2a and in addition, the inductance on the reading out side is lowered than heretofore. The higher reading out voltage is obtd. in this way. The performance and quality to read out the information of the magnetic head 11 are, therefore, improved. The magnetic resistance between the core 2 for reading out and the side cores 3 is increased in this way and the reading out of the signals of the adjacent tracks by the deviation in the recording medium is prevented.

Description

[Detailed Description of the Invention] (Industrial field in Icheon) This invention relates to a magnetic head that reads and writes information to and from a recording medium such as a magnetic card or magnetic tape using a common magnetic gap. (Prior Art) Conventionally, a magnetic head that dually writes and reads information on a recording medium such as a magnetic card or magnetic tape is called a read/write magnetic head, and has a structure as shown in Fig. 4. It has become.

In Figure 4, 1 is a wide writing core (hereinafter referred to as a light core), and 2 is a wide light core! Narrower read core (hereinafter referred to as read core), 3 is read core 2
The side cores 4 provided on both sides are blocking plates for magnetic shielding. 5 is a magnetic gap (hereinafter referred to as a gap); 6 is a write coil wound around the write core 1; and 7 is a read coil wound around the read core 2. The lead core 2 is adhesively fixed to side cores 3, 3 on both sides via a shielding plate 4, and the adhesively fixed lead core 2 and side cores 3, 3 are connected to each other through a gap 5 formed by a non-magnetic spacer at one end. Both ends are directly adhesively fixed to the light core 1 to form a magnetic circuit. ! 0 is a magnetic head. In addition, in the conventional example of the above-mentioned structure, the track width of the 'H read core 2 is made narrower than the track width of the write core 1 in consideration of the case where the track is misaligned during signal reading. 3.3 is used to secure the track width during writing. Next, the operation will be explained.

First, when a current based on a write signal flows through the punching coil 6, this current generates magnetic flux, which flows through the write core 1, crosses the gap 5, passes through the read core 2 and side cores 3, and returns to its original state. It's coming. Writing AC River Coil 6
The direction of the magnetic flux changes to alternating η, but when it jumps over the gap 5, this magnetic flux is written as a signal on a magnetic card or magnetic tape. Next, when the old signal is embedded in the magnetic card or magnetic tape, the magnetic flux generated by the old signal is picked up by the gap 5, the magnetic flux flows into the read core 2, and the magnetic flux flows into the reading coil 7. A voltage is generated, and the write signal can be read using this generated voltage as a signal. (2! Problems to be Solved by the Invention) However, in the conventional example, since the lead core 2 and the side cores 3.3 on both sides are close to each other, when the recording medium shifts in the track width direction, either side core 3 picks up the magnetic flux of the adjacent track, and this magnetic flux flows into the read core 2, which not only results in an {aS number different from the original No. 15, but also increases the inductance of the read steel, which causes a problem in that the output decreases. Ta.

This invention was made to solve the problems of the conventional method as described above. Even when the recording medium shifts in the track width direction, the magnetic influence of the side core that has picked up the magnetic flux of the adjacent track is absorbed by the read core. The eleventh objective is to provide a magnetic head with high magnetic resistance between the read core and the side core, which is not affected by the magnetic field. (2! Means for Solving the Problem) Therefore, in the magnetic head according to the present invention, the Angome River magnetic gap and the read magnetic gap are common, and the read core having a width narrower than the S write core width is used. In a magnetic head in which a side core is provided on the read core through a blocking plate, the above object is achieved by making the core width of the read core narrower as it moves away from the magnetic gap.

(Function) The magnetic head according to the present invention configured as described above has the following features:
Since the core width of the reading core is made narrower as it goes away from the magnetic gap, the magnetic resistance between the reading core and the side core increases when information is successively read, and the successive reading core is no longer affected by the side core's magnetic influence. Furthermore, since the inductance on the output side is lower than that of the conventional example, the read voltage No. f5 becomes higher than that of the conventional example. [Example] Examples of the present invention will be described below based on the drawings. <<Structure>> FIG. 1 is a perspective view of a magnetic head showing a first embodiment of the present invention.

In each figure, parts that are the same as or equivalent to the conventional example are indicated by the same symbols. In FIG. 1, 2a is a loaded core. This lead core 2a has the original lead track width at the abutment a with the gap 5 and the abutment surface (not shown) that is adhesively fixed to the light core 1 on the opposite side of the gap 5. The width of the lead core 2a becomes narrower as it moves away from the lead core 2a, forming a tapered shape α. This allows gap 5
Lead core 2a and side core 3
The configuration is such that the distance between the

1 is a magnetic head.

"motion" The operation in the above configuration will be explained.

The operation of writing and reading information to and from a magnetic card or magnetic tape is the same as in the prior art, so a detailed explanation will be omitted.

As shown in FIG. 1, by making the core width of the lead core 2a into a tapered shape α that becomes narrower as it goes away from the gap 5, the magnetic resistance between the lead core 2a and the side cores 3, 3 is increased compared to the conventional example. This not only prevents the read core 2a from being affected by the magnetic influence of the site core 3 that picks up signals from adjacent tracks, but also
The inductance of the readout steel is lower than in the conventional example, which increases the readout voltage. Therefore, the information reading performance and quality of the magnetic head 1l can be improved. Then the second
The figure shows a perspective view of a magnetic head according to a second embodiment. In Figure 2, 2b is a loaded core, and site cores 3, 3
Only the protruding portion A at both ends of the core and the opposing portion B are cut into a tapered shape α, similar to the first embodiment, and the other portions are made to have the same width as the conventional REIT core width. 11a&;i magnetic head. Since its operation is similar to that of the first embodiment, its explanation will be omitted.

FIG. 3 shows a perspective view of a magnetic head according to a third embodiment. In FIG. 3, 2C is a lead core whose shape is further different from that of the navigation example, and the lead core 2C is a side core 3.
, 3 are cut into a stepped shape β as the distance from the gap 5 increases. Therefore, the distance from the side core 3 becomes gradually wider as the distance from the gap 5 increases. llb is a magnetic head. Since the operation is the same as that of the above-mentioned embodiment, detailed explanation will be omitted.

〔Effect of the invention〕

As described above, according to the present invention, the core width of the reading core is formed to become narrower as the distance from the magnetic gap increases, and as a result, the distance between the reading core and the side core increases as the distance from the magnetic gap increases. As a result, the magnetic resistance between the reading core and the side core increases, and it is possible to prevent signals from adjacent tracks from being read due to misalignment of the recording medium. In addition to this, since the inductance on the read side is lower than in the past, the read voltage is increased, so that the performance and quality of the magnetic head can be significantly improved.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a magnetic head showing a first embodiment of the invention, FIG. 2 is a perspective view of a magnetic head showing a second embodiment of the invention, and FIG. 3 is a perspective view of a magnetic head showing a third embodiment of the invention. FIG. 2 is a perspective view of a magnetic head shown in FIG. 1, and a perspective view of a conventional magnetic head. ! ...Light core 2, 2a, 2b, 2C-=Lead core 3...Side core 4...Break plate 5...Gap 10, 11. lla, 11 α. α1...Taber shape β...Step shape The same representation is given in each figure. b-...Magnetic head or corresponding parts are the same reference numerals in Figure 4.

Claims (1)

[Claims] In a magnetic head in which a write magnetic gap and a read magnetic gap are common, a read core whose width is narrower than the write core width, and a side core is provided to this read core through a blocking plate, the read A magnetic head characterized in that the core width of the core becomes narrower as the distance from the magnetic gap increases.