JP2921262B2 - Long magnetic sensor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a long magnetic sensor, and more particularly, to a long magnetic sensor capable of reliably detecting the entire surface of an object such as a magnetic card at a high density.

[0002]

2. Description of the Related Art FIG. 8 is a perspective view of an example of a conventional long magnetic sensor. In this long magnetic sensor 600, a plurality of (four in FIG. 8) concave portions 61 'are provided on one surface of the case 61 at predetermined intervals C'. A magnetoresistive element 62 is fitted in each recess 61 '. That is, the magnetoresistive elements 62 are linearly arranged with an interval C ′. Reference numeral 65 denotes a lead wire, which connects the magnetoresistive element 62 to the terminal pin 66.

An object 611 is a long magnetic sensor 600.
Pass in the direction orthogonal to the direction in which the magnetoresistive elements 62 are linearly arranged. 630 is a magnetic pattern of the subject 611.

FIG. 9 is a cross-sectional view of the long magnetic sensor 600 in the long side direction. On the other surface of the case 61, each recess 6
1 ′ are provided with magnet recesses 61 ″, and permanent magnets 63 are respectively installed in the magnet recesses 61 ″. 64 is a metal cover.

FIG. 10 is an explanatory diagram of a detection state by the magnetoresistive element 62. The plurality of magnetic patterns 630 of the subject 611 are used for the magnetic resistance element 6 of the long magnetic sensor 600.
Each of them is detected by passing over the second detector K ′.

[0006]

In the conventional long magnetic sensor 600, when the position of the magnetic pattern 630 of the subject 611 is changed as shown in FIG. 11, the distance C 'does not pass over the detecting portion. There is a problem that a magnetic pattern 630 that passes through the portion appears, and the magnetic pattern 630 cannot be detected. Further, as shown in FIG.
In the case where is located on the entire surface of the subject 611, since the magnetic pattern 630 cannot be detected in the portion at the interval C ′, there is a problem that the readable information density becomes lower accordingly. Accordingly, an object of the present invention is to provide a long magnetic field that can flexibly cope with a change in the position of a magnetic pattern and can read with high information density even when the magnetic pattern of the subject is present on the entire surface. It is to provide a sensor.

[0007]

According to a long magnetic sensor of the present invention, a long first groove is provided on one surface side of a long case in a long side direction of the case, and the first groove is provided in the case. A plurality of terminal pins having one end exposed on both sides in the longitudinal direction are planted, and an elongated second groove is provided on the surface opposite to the surface on which the first groove is provided, back to back with the first groove. a plurality of inserting a magnetoresistive element and Se' When arranged in a straight line respectively contact the co-Niso lead terminal of the terminal pins, a long magnet or a row densely arranged in the second groove in one groove A plurality of short magnets are inserted and installed with their magnetic pole faces facing the magnetoresistive element,
Point the magnetoresistive element toward the subject
The subject, which moves relatively in the direction orthogonal to the array direction,
It is characterized by reading magnetic information .

[0008]

[Action] In long magnetic sensor of the present invention, provided with a first groove elongated to the case long side direction on one surface of the elongated casing,
A plurality of magnetoresistive elements are closely arranged in a straight line, and
The lead element mizuko was connected to each terminal pin.
Further, the case long side direction on the other side of the elongated casing provided with a second groove of the elongated plurality of closely spaced in the longitudinal magnet or a row
A short magnet was installed .

Therefore, even if the position of the magnetic pattern of the subject is changed, it can be suitably detected by any of the magnetoresistive elements . Since a long magnet or a closely arranged short magnet is used, there is no problem in terms of magnetic bias to the magnetoresistive element. In addition, the magnetic pattern of the subject
It also can detect the entire almost magnetic pattern, Ru can read without reducing the information density.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in more detail with reference to the embodiments shown in the drawings. It should be noted that the present invention is not limited by this. FIG. 1 is a perspective view of a long magnetic sensor 100 according to an embodiment of the present invention.

In this long magnetic sensor 100, a groove 1 'is formed in the center of one surface of the long case 1 in the same direction as the long side of the case. In order to prevent the magnetoresistive element 2 from shifting in the groove 1 ', it is preferable that the groove 1' is not provided at both ends.

Here, the depth of the groove portion 1 'is larger than the thickness of the magnetoresistive element 2, and the width may be such that the magnetoresistive element 2 does not shift excessively. Further, the length may be such that a desired number of magnetoresistive elements 2 can be accommodated and do not shift excessively.

[0013] On both sides of the groove 1 'of the case 1 in the same longitudinal direction.
Indicates that one end of each terminal pin 6 is exposed in a row.
You. The terminal pins 6 penetrate the case 1 and are erected there.
It protrudes to the opposite side from 1 '. The groove portions 1 'are arranged in a straight line the magnetoresistive element 2 of desired number. Each magnetoresistive element 2
Are made individually.

The magnetoresistive elements 2 are mutually connected in the groove 2 '.
Close contact. Three for each magnetoresistive element 2
Are provided.

Further, a lead terminal 5 is led out from each of the magnetoresistive elements 2, and this lead terminal 5 is fixed to the case 1 .
It is connected to the exposed end of the terminal pin 6 corresponding to each lead terminal 5.

Specifically, FIG. 1 shows a three-terminal magnetoresistive element.
2 is shown. The three lead terminals are at different ends
Connected to the child pin 6.

FIG. 2 is a cross-sectional view of the long magnetic sensor 100 in the long side direction.

On the surface opposite to the surface on which the groove 1 'is provided, a groove 1 "in the same direction as the long side of the case is provided so as to correspond to the groove 1'.

A long magnet is installed in the groove 1 "as a magnet for magnet bias. The pole face of the long magnet 3 is
It is inserted facing the magnetoresistive element 2.

Here, the depth of the groove portion 1 "is larger than the thickness of the magnetic bias magnet, and the length and width thereof need only be such that the magnetic bias magnet can be installed.

The detection surface, which is the surface provided with the groove 1 ',
Generally, it is covered with a metal cover 4.

Further, specifically, the shape of the metal cover 4 is as follows.
Any shape may be used as long as it can cover the magnetoresistive element 2.

FIG. 3 and FIG. 4 are explanatory diagrams of a detection state of the subject 611 having a magnetic pattern 630 in part. Since the magnetic resistance elements 2 are densely arranged, the magnetic pattern 6
Even if the position of 30 is different as shown in FIGS. 3 and 4,
It can be suitably detected. FIG. 5 is an explanatory diagram of a detection state for a subject 611 having a magnetic pattern 630 on the entire surface. Since the interval C is minimized, it is possible to detect with a high information density.

FIG. 6 is an explanatory view of a long magnetic sensor 200 according to another embodiment of the present invention. In this long magnetic sensor 200, relatively short permanent magnets 3 'are densely arranged,
It is substantially longer. That is, a plurality of short magnets 3 '
Are arranged in a line. Otherwise, the configuration is the same as that of the long magnetic sensor 100 of the above embodiment. FIG. 7 shows a long magnetic sensor 30 according to still another embodiment of the present invention.
FIG. This long magnetic sensor 300 has four
The terminal type magnetoresistive element 21 is used. Otherwise, the configuration is the same as that of the long magnetic sensor 100 of the above embodiment. Since the four-terminal type magnetoresistive element 21 is used, the width and position of the detection area can be freely set by external connection. In the example of FIG. 7, in order to detect the range A of the subject 611, the magnetoresistive elements 21 to 25 are externally connected and used as one magnetoresistive element. On the other hand, in order to detect the range B of the subject 611, the magnetoresistive element 26 is used alone.

[0025]

According to the long magnetic sensor of the present invention,
In addition to being able to flexibly cope with a change in the position of the magnetic pattern, reading can be performed with a high information density even when the magnetic pattern of the subject is present on the entire surface.

[Brief description of the drawings]

FIG. 1 is a perspective view of a long magnetic sensor according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view in the long side direction of the long magnetic sensor of FIG.

FIG. 3 is an explanatory diagram of a detection state by the long magnetic sensor of FIG. 1;

FIG. 4 is an explanatory diagram of another detection state by the long magnetic sensor of FIG. 1;

FIG. 5 is an explanatory diagram of still another detection state by the long magnetic sensor of FIG. 1;

FIG. 6 is an explanatory view of a long magnetic sensor according to another embodiment of the present invention.

FIG. 7 is an explanatory view of a long magnetic sensor according to still another embodiment of the present invention.

FIG. 8 is a perspective view of an example of a conventional long magnetic sensor.

FIG. 9 is a cross-sectional view of the long magnetic sensor of FIG. 8 in a long side direction.

FIG. 10 is an explanatory diagram of a detection state by the long magnetic sensor of FIG. 8;

FIG. 11 is an explanatory diagram of another detection state by the long magnetic sensor of FIG. 8;

FIG. 12 is an explanatory diagram of still another detection state by the long magnetic sensor of FIG. 8;

[Explanation of symbols]

 100, 200, 300 Long magnetic sensor 1 Case 1 'Groove 1 "Magnet groove 2 Magnetoresistive element 3 Long magnet 3' Relatively short magnet 4 Metal cover 611 Subject 630 Magnetic pattern C interval K detector 21 to 21 25 Magnetoresistance element

Claims (1)

(57) [Claims] 1. A plurality of terminal pins each having a first groove extending in a long side direction of a case on one surface side of a long case and having one end exposed at both longitudinal sides of the first groove in the case. And the first groove is formed on the surface opposite to the surface provided with the first groove.
The second groove elongated provided back to back and the groove, contact the lead terminal of the the first by inserting a plurality of magnetoresistive elements in the grooves arranged in each contact linearly co Niso to the terminal pins Despite the fact, a long magnet or a plurality of short magnets arranged in a line in a row are inserted and installed in the second groove with the magnetic pole surface facing the magnetoresistive element.
Pointing the magnetoresistive element toward a subject,
The relative movement in the direction orthogonal to the linear arrangement direction of the child
A long magnet sensor for reading magnetic information of a subject .