JPH03181006A - Magnetic head - Google Patents

Abstract

PURPOSE:To prevent the falsification of a prepaid card by forming the magnetic gap part of the magnetic head to a nonlinear shape having no straight parts in one track. CONSTITUTION:The magnetic gap part 3a is made into the nonlinear shape having no straight parts in one track. Magnetic cores 2a and magnetic gap parts 3a consisting of plural pieces have similarly the nonlinear shape having no straight parts in one track. The gap azimuth does not, therefore, match even if the card recorded by the magnetic head is attempted to be read by the magnetic head having the straight gap shape. The reproduced output is consequently not emitted by gap losses and the reading is not possible. The obtaining and simulating the magnetic head of the same gap shape are difficult in this way and the falsification is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Packaging] The present invention relates to a magnetic head, and particularly to the shape of the magnetic head.

[Conventional technology]

FIG. 3 is a plan view of a conventional magnetic head, and FIG. 4 is a half-view illustrating another form of the conventional magnetic head, which is used, for example, in magnetic passbooks or prepaid cards. In Figure 3 of the drawing, 1 is a shield case, 2
is a magnetic core, and 3 is a magnetic gap portion.

The magnetic head shown in FIG. 3 has one track, and FIG. 4 shows a magnetic head consisting of several tracks. These magnetic heads discriminate based on the recording pattern of each track. However, the magnetic gap portion of each track had a linear shape as shown in FIGS. 3 and 4.

(Problem to be Solved by the Invention) As described above, in the conventional example, when the recording patterns of these tracks are used for discrimination, since the gap shape is a straight line, the recorded contents can be relatively easily determined using magnetic heads etc. on the market. was able to be deciphered and forged. Therefore, in order to eliminate these crimes, a recording method that makes forgery difficult is necessary.

This invention was made in order to solve the problems of the conventional examples as described above. By using a magnetic head, magnetic passbook cards or prepaid cards, etc., are difficult to be counterfeited, and their reliability is improved. and to improve social order.

[Means to solve the problem]

Therefore, in the present invention, a magnetic head for recording or reproducing signals is characterized in that the magnetic gap part of the magnetic spatula has a non-linear shape with no straight part in one track. By doing so, the above-mentioned IJ objectives are not achieved.

(Function) The magnetic head of this invention C has a magnetic gap part of the magnetic head in a non-linear shape with no straight part in one track, so that a card recorded with this 64% head is different from the conventional example. Even if you try to read with a magnetic head with a linear gap as shown above, the gap azimuth (
Since the gap orientation does not match, the reproduced output cannot be read due to gap loss.

(Example) Hereinafter, one embodiment of the present invention will be described based on the drawings.

FIG. 1 is a plan view of a magnetic head which is an embodiment of the present invention, and FIG. 2 is a plan view illustrating another form of this embodiment.

In the drawings, the same or equivalent components as those in the conventional example are indicated by the same reference numerals, and redundant explanation will be omitted.

In FIG. 1 of the drawing, 3a is a magnetic gap part, and 1
It has a non-linear shape with no straight parts in the track. In addition, in FIG. 2 of the drawing, 2a is a magnetic core consisting of a plurality of pieces (three pieces in this case), 3a is a magnetic gap part, and the first
Similar to the magnetic gap portion 3a in the figure, it has a non-linear shape with no straight line portion within one track.

Next, the operation of this embodiment will be explained using FIGS. 1 and 2.

For example, if you try to read a card recorded with the magnetic head shown in Figure 'f1f with a conventional magnetic head with a straight gap shape as shown in Figure 3, the read output will be output due to gap loss on the island where the gap azimuth does not match. I can't. Even if the gap has a non-linear shape, if it is recorded with a magnetic head that has a straight part in a part of the gap, if the azimuth of the gap of the magnetic head in Figure 3 is aligned with the straight part, a reproduced output will be output and decodable. can do.

Even if the magnetic pattern is decoded using a magnetic developer or the like, it cannot be used unless it is recorded using a magnetic head with the same gap shape. It is extremely difficult to obtain or imitate a magnetic head with the same gap shape, and counterfeiting can be prevented.

〔Effect of the invention〕

As explained above, according to the present invention, magnetic passbook cards, prepaid cards, etc. are less likely to be forged, and reliability and social order are improved.

[Brief explanation of drawings]

FIG. 1 is a plan view of a magnetic head that is an embodiment of the present invention, FIG. 2 is a plan view illustrating another form of this embodiment, FIG. 3 is a plan view of a conventional magnetic head, and FIG. The figure is a plan view illustrating another form of this conventional example. 1...Shield case 2゜2a...Magnetic core 3゜3a ----- Gap part In the figures, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims] 1. A magnetic head for recording or reproducing signals, characterized in that a magnetic gap portion of the magnetic head has a non-linear shape with no linear portion in one track.