JPH0411204Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic head, and more particularly to a structure that makes it clear when to replace the magnetic head.

Traditionally, magnetic heads that are used in contact with magnetic recording media wear out in proportion to the length of time they are used, resulting in changes in electrical characteristics and poor contact with the magnetic recording media, resulting in frequent errors. known to be the cause. For this reason, in conventional use, the time to replace the magnetic head was determined by measuring the amount of wear using an experimentally determined time or using a wear measuring jig.

However, in reality, the amount of wear varies greatly depending on the type of magnetic recording medium used, contact pressure, and environmental conditions, so in the former case, the replacement period may be delayed or too early, and in the latter case, However, there were problems with the accuracy of the measuring device and measurement errors, and there were drawbacks such as damage to the magnetic head during measurement.

An object of the present invention is to provide a magnetic head whose usable wear limit can be easily detected.

In order to clarify the usable wear amount of the magnetic head, the present invention creates grooves with a groove depth corresponding to the allowable wear amount on the surface of the magnetic head that comes into contact with the magnetic recording medium, at both ends of the magnetic recording medium in the width direction. A magnetic head characterized in that the magnetic heads are provided at intervals narrower than the width of the medium.

Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of a magnetic head showing an embodiment of the present invention, and a magnetic head assembly 1 has a groove 2. As shown in FIG. Normally, the surface of the magnetic head that comes into contact with the magnetic recording medium is finished to a nearly mirror-like roughness with wrapping tape or the like after molding in order to stabilize the tape touch and prevent damage to the magnetic recording medium. FIG. 2 shows a sectional view of the gap portion of the magnetic head of FIG. In FIG. 2, in the case of a normal 1/2 inch magnetic tape head, the interval a between the grooves 2 of the magnetic head 1 is 12.65 mm, which is the width of the magnetic tape that is the magnetic recording medium 3.
It is approximately 12.5mm compared to ±0.05mm. Generally, the cross-section of the worn shape of the surface of a magnetic head without grooves at both ends is as shown in Figure 3.Since the cheap touch becomes unstable near both ends of the tape, grooves 2 as shown in Figure 1 are provided. There are many things. However, in the past, the depth of this groove was provided as a preventive measure against the above-mentioned chip instability after wear, and was not particularly defined, and was 0.3 to 0.5 mm deep. In the present invention, we focused on this depth, investigated the wear shape of many magnetic heads, and based on the values of center wear amount b and both end wear amount c in Figure 3 (c-b).
The depth of the groove 2 was set to be 25 μm plus the allowable wear amount of the magnetic head. By setting this depth, the magnetic head reaches the end of its life when the amount of wear on the surface of the magnetic head becomes equal to the groove depth at both ends, and the time for replacement becomes clear.

As explained above, the present invention provides grooves 25 μm deeper than the allowable wear amount of the magnetic head at both ends of the magnetic recording medium in the width direction on the surface of the magnetic head.
This has the effect of making it easier to determine when to replace the magnetic head.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing one embodiment of the present invention;
This figure is a sectional view showing the gap portion of the magnetic head shown in FIG. 1, and FIG. 3 is a sectional view showing the worn shape of the magnetic head. 1...Magnetic head, 2...Groove, 3...Magnetic recording medium.

Claims (1)

[Scope of utility model registration request] Grooves having a groove depth corresponding to the permissible wear amount of the magnetic head are provided on the surface of the magnetic head in contact with the magnetic tape at both widthwise ends of the magnetic tape at intervals narrower than the width of the magnetic tape. magnetic head.