JPH07117979B2 - Magnet card reader - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an improvement of a magnetic card reader, and in particular, simplifies the so-called strobe signal generating mechanism to make the structure of the reader compact and to improve reliability. Also relates to an improved magnetic card reader.

[Conventional technology]

As shown in FIG. 1, the magnet card 1 includes a holder 3, which is a non-magnetic plate with a knob 2, and a plurality of small permanent magnets 4, 4 attached to a holder 3.
Is embedded in a fixed development pattern, each permanent magnet 4 is assigned an information amount of 1 bit, and the bit content of 1 or 0 of each bit is represented by the presence or absence of magnetization of each magnet 4 or the direction of magnetization. It is a kind of information carrier.

On the other hand, the reader 5 includes a slit into which the holder 3 of the magnetic card is inserted and a magnetizing coil, a reed switch, a Hall element, a Hall IC, etc., which are two-dimensionally arranged in the same development pattern as the permanent magnets 4, 4. Having a plurality of magnetometers 6 of
As shown in FIG. 1, when the magnet card 1 is fully inserted into the slit, each magnetizer 6 is aligned with the corresponding permanent magnet 4 and overlaps with it.

In such a magnet card reader, the permanent magnets 4, 4 hold information more reliably than the magnetic card, and the information read by the reader can be used as various control data by the computer. Moreover, the magnet card is a so-called magnet tumbler lock. Since a magnet tumbler can be mechanically driven as a key, it is often used as a lock for an unmanned safe deposit box system, a hotel guest room management system, and various other devices.

Then, the reading of the magnet card 1 by the reader 5 is performed in parallel by the magnetizer groups 6 and 6, that is, at the same time,
Depending on the degree of magnetization of the permanent magnet 4 of the magnet card, the sensitivity of the magnetizer 6 or the displacement of the relative position of the magnetizer 6 corresponding to the permanent magnet 4, etc., the insertion of the magnet card into the reader as shown in FIG. At this time, the reading of the bit content of the corresponding permanent magnet 4 by each magnetizer 6 is delayed. However, in FIG. 2, mi (i = 1 to 12) indicates the temporal change of the outputs of the magnetic detectors 6, 6 shown in FIG. Therefore, as shown in FIG. 2, the strobe signal that determines the timing for reading the outputs of the magnetizer groups 6 and 6 is output from the reading of the permanent magnets 4 by each magnetizer 6 at time t ₁ when the change of mi ends. It needs to be delayed. Incidentally, usually permanent magnets 4 is smaller than the detection porcelain 6, since the permanent magnets 4 before plugged full magnet card into the slit falls within Ken磁range of inspection porcelain 6, the time t ₁ and the permanent magnet 4 test It may be a little before the time when the porcelain 6 is matched (see FIG. 1).

In order to generate the strobe signal, the conventional magnet card reader, for example, as shown in FIG. 1, has a permanent arm for generating a strobe signal at a short arm and a tip which engage with the front edge of the magnet card 1 in the reader 5. A strobe lever 8 having a long arm equipped with (hereinafter referred to as a strobe magnet) 7 is swingably provided, and the movement of the end portion of the insertion stroke of the magnet card 1 into the reader 5 is amplified by the strobe lever 8 to strobe magnet. 7 and uses the output of a strobe detector (not shown) that matches the strobe magnet 7 as the strobe signal when the magnet card 1 is fully inserted in the slit as shown in FIG. (See JP-A-59-32063). In this case, the strobe magnet 7 moves and the strobe signal is generated after the permanent magnets 4 and the corresponding detectors 6 are substantially aligned.

[Problems to be Solved by the Invention]

The conventional magnetic card reader having the above-mentioned structure naturally exhibits its intended function and has been used without any problems.

However, since the strobe lever 8 is built in the reader 5, the reader becomes larger by that amount, and if the reader is made smaller, the information amount of the magnet card 1 becomes smaller accordingly, which is a little inconvenience.

Furthermore, since it has mechanically movable parts, it is impossible to completely deny the occurrence of a failure such as movement of the stroke lever becoming sluggish or not moving due to intrusion of dust into the reader. I still have the feeling that there is some lack of reliability.

It is an object of the present invention to improve a conventional card reader, provide a compact and highly reliable magnet card reader, and eliminate the above-mentioned inconvenience.

[Means for Solving the Problems]

In order to achieve the above object, the invention according to claim 1 is
It has a magnet card in which a plurality of permanent magnets are embedded in a non-magnetic holder in a fixed development pattern, and a slit into which the holder of the magnet card is inserted. A reader having a plurality of magnetizers for reading information carried by a magnet, and at least one selected from a group of permanent magnets on a holder.
As the individual strobe magnets and the magnetizers corresponding to the strobe magnets are designated as the strobe magnetizers, the relative positional relationship between the strobe magnet and the strobe magnetizer when the holder of the magnetic card is fully inserted in the slit of the reader. Is set so that the strobe magnet shifts in the direction of approaching the slit entrance in the insertion direction of the magnet card, and as a result, the output of the strobe detector whose timing of generation is later than other detectors is extracted as a strobe signal. It is characterized by having done.

In the invention according to claim 2, the size of the strobe magnet is set to be smaller than that of the other permanent magnets at least in the insertion direction of the magnet card, and as a result, the generation timing is delayed compared to the other magnetizers. It is characterized in that the output of the strobe detector is taken out as a strobe signal.

Furthermore, in the invention according to claim 3, the magnetic flux density of the strobe magnet is made smaller than that of the other permanent magnets, and as a result, the output of the strobe magnetizer whose generation timing is later than that of the other magnetizer is strobed. The feature is that it is taken out as a signal.

In the invention according to claim 4, the relative position of the strobe magnet with respect to the strobe magnetizer is shifted in a direction substantially perpendicular to the insertion direction of the magnet card, and as a result, the generation timing is delayed compared to the other magnetizers. It is characterized in that the output of the magnetometer is taken out as a strobe signal.

[Work]

In the magnet card reader according to the present invention configured as described above, when the magnet card is inserted into the slit of the reader, the distance between the strobe magnet and the strobe detector is different from that of other permanent magnets. Greater than the distance to the corresponding magnetometer. Therefore, the superposition of the strobe magnet and the strobe magnetizer is delayed most, and the strobe signal as the output of the strobe magnetizer is inevitably generated after the output of another magnetizer is generated.

According to the second aspect of the invention, the distance between the strobe magnet and the strobe magnetizer is the same as the distance between the other permanent magnets and the corresponding magnetizer, but at least the magnet card of the strobe magnet is inserted. The dimension in the direction is smaller than other permanent magnets. Therefore, the superposition of the strobe magnet and the strobe magnetizer is delayed most, and the strobe signal as the output of the strobe magnetizer is inevitably generated after the output of another magnetizer is generated.

Still further, according to the invention of claim 3, the strobe magnet has the same size and relative positional relationship with respect to the strobe detector as the other permanent magnets. Therefore, the geometrical superposition of the strobe magnet and the strobe magnetizer is the same as that of other permanent magnets. However, since the magnetic flux density of the strobe magnet is smaller than that of other permanent magnets,
The rate of increase of the transmitted magnetic flux to the strobe detector is smaller than that to other detectors, and in the end, it remains the same as when the stacking of the strobe magnet and the strobe detector is delayed. It occurs after the output of the detector.

Further, according to the invention described in claim 4, since the strobe magnet is displaced from the strobe detector in the width direction of the magnet card, when these overlap, a part of the former magnetic flux,
That is, the magnetic flux from the strobe magnet portion protruding from the strobe detector does not pass through the latter. In other words,
From the strobe detector, it is observed that the magnetic flux density of the strobe magnet has decreased. Therefore, at the same time as in the invention according to the third aspect, the strobe signal is always generated after the output of another magnetic detector.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS.

In the invention according to claim 1, as shown in FIG. 3, at least one of the permanent magnets 4, 4 on the holder 3 of the magnet card is used as the strobe magnet 7, and the detection corresponding to the strobe magnet 7 is performed. The porcelain is designated as the strobe detector 9. Then, when the holder 3 is fully inserted in the slit of the reader 5, in other words, when the front end edge of the holder 3 comes into contact with the stop step in the slit as shown in FIG. 1, it is shown in FIG. As described above, the permanent magnets 4 and the corresponding magnetizers 6 are aligned with each other, that is, the central axes of the magnets 6 are aligned with each other, so that the strobe magnets 7 overlap with each other with respect to the strobe magnetizer 9. The relative positional relationship between the strobe magnet 7 and the strobe detector 9 is set so as to deviate by δ. In this case, even if the strobe magnet 7 is displaced toward the entrance side of the slit from the virtual state in which the strobe magnet 7 and the strobe magnetizer 9 are aligned with each other, or the strobe magnetism detector 9 is displaced away from the entrance of the slit. Of course, it is also good.

In the invention described in claim 2, as shown in FIG. 4, the dimension of the strobe magnet 7 is set to be smaller than other permanent magnets at least in the insertion direction of the magnet card (left and right direction in FIG. 4). Has been done. In this case, the development patterns of the permanent magnet group including the strobe magnet 7 and the magnetizer group including the strobe magnetizer 9 are the same.

In the invention described in claim 3, as shown in FIG. 5, the sizes of the permanent magnet 4 and the strobe magnet 7 are the same, at least the size of the projected image on the development plane of the permanent magnet group, and the strobe magnet. Although the development patterns of the permanent magnet group including 7 and the magnetometer group including the strobe magnetizer 9 are also the same, the magnetic flux density of the strobe magnet 7 is set to be smaller than that of the permanent magnet. In order to make the magnetic flux density of the strobe magnet 7 smaller than that of the permanent magnet 4, the thickness of the magnet having the same strength may be reduced as shown in FIG. The amount of magnetization may be reduced.

In the invention described in claim 4, the size and strength of the strobe magnet 7 are the same as those of the permanent magnet 4, but the relative position of the strobe magnet 7 with respect to the strobe detector 9 is as shown in FIG. The width direction of the card 1, in other words, the magnet card 1 is set so as to be displaced in a direction (vertical direction in FIG. 6) perpendicular to the insertion direction of the magnet card 1 and the thickness direction of the magnet card 1. 3 to 5, reference numeral 10 indicates a thin cover plate made of a non-magnetic material.

Further, in the illustrated embodiment, all the magnets are embedded in the holder 3 at the locations set to embed the magnets 4 (7), and the direction of magnetization by the magnetizer, that is, the magnetic pole facing the magnetometer is The bit content of 1 or 0 is read by detecting whether it is the N pole or the S pole. However, depending on the type of the magnetic detector, there is a device that outputs only to a specific magnetic pole. , It is indistinguishable between the case where the magnetic poles of the facing magnets are opposite poles and the case where the magnets do not exist in the first place. do it.

〔The invention's effect〕

As is apparent from the above description, according to the present invention, at least one of the permanent magnet groups on the holder is designated as a strobe magnet, and a magnetizer corresponding to the strobe magnet is designated as a strobe magnetizer. The relative position to the magnetometer is shifted in the holder insertion direction or in a direction almost perpendicular to the holder insertion direction, the strobe magnet is made smaller than the permanent magnet, or the magnetic flux density of the strobe magnet is made smaller than other permanent magnets. Therefore, the output of the strobe detector is delayed from that of the other detectors, and the output of the strobe detector can be used as a strobe signal. Therefore, a mechanical strobe signal generating member can be eliminated, and the structure of the reader is simple and compact accordingly.

In addition, since a strobe signal is generated simply by bringing the strobe magnet and the strobe detector close to each other without using a mechanical movable member to generate the strobe signal, it is expected that the strobe signal generating mechanism will operate reliably for a long period of time. Therefore, various advantages such as the reliability of the magnet card reader is significantly increased can be obtained.

[Brief description of drawings]

FIG. 1 is a plan view showing a magnet card reader with a cover plate removed, showing an example of the structure of a conventional magnet card reader.
FIG. 3 is a graph showing an output waveform of a magnetizer group of a magnet card reader, and FIGS. 3 to 5 are claims 1, 2 and 3, respectively.
FIG. 6 is a schematic enlarged cross-sectional view of a main part of the magnet card reader according to the invention described in FIG. 6, and FIG. 1 ... Magnet card, 3 ... Holder, 4 ... Permanent magnet, 5
...... Reader, 6 …… Magnetometer, 7 …… Strobe magnet, 9
...... Strobe magnetometer.

Claims (4)

[Claims] 1. A non-magnetic holder having a magnet card in which a plurality of permanent magnets are embedded in a fixed development pattern, and a slit into which the holder of the magnet card is inserted. The permanent magnet of the holder inserted in the slit. And a reader provided with a plurality of magnetizers that read out the information carried by the permanent magnet by superimposing the same on at least one selected from the permanent magnet group on the holder as a strobe magnet and corresponding to this strobe magnet. The strobe magnet and the strobe magnet when the holder of the magnet card is fully inserted in the slit of the reader are designated as strobe magnets. It is set so that it moves closer to the entrance, and as a result, the timing of occurrence is later than that of other detectors. Magnet card reader, characterized in that the output of that strobe test porcelain they were taken out as a strobe signal. 2. A non-magnetic holder having a magnet card in which a plurality of permanent magnets are embedded in a fixed development pattern, and a slit into which the holder for the magnet card is inserted, and the permanent magnet of the holder inserted in the slit. And a reader having a plurality of magnetizers that read out the information carried by the permanent magnet by superimposing the same on at least one selected from the permanent magnet group on the holder as a strobe magnet and corresponding to this strobe magnet. Each of the detectors is specified as a strobe detector, and the size of the strobe magnet is set to be smaller than other permanent magnets at least in the insertion direction of the magnet card. The magnetic curdley is characterized in that the output of the strobe detector is delayed as a strobe signal. Da. 3. A non-magnetic holder having a magnet card in which a plurality of permanent magnets are embedded in a fixed development pattern, and a slit into which the holder for the magnet card is inserted, and the permanent magnet of the holder inserted in the slit. And a reader provided with a plurality of magnetizers that read out the information carried by the permanent magnet by superimposing the same on at least one selected from the permanent magnet group on the holder as a strobe magnet and corresponding to this strobe magnet. The specified strobe detector is designated as a strobe detector, and the magnetic flux density of the strobe magnet is made smaller than that of other permanent magnets. A magnet card reader characterized by being taken out as a signal. 4. A non-magnetic holder having a magnet card in which a plurality of permanent magnets are embedded in a fixed development pattern, and a slit into which the holder of the magnet card is inserted. The permanent magnet of the holder inserted in the slit. And a reader provided with a plurality of magnetizers that read out the information carried by the permanent magnet by superimposing the same on at least one selected from the permanent magnet group on the holder as a strobe magnet and corresponding to this strobe magnet. The specified strobe detector is designated as a strobe magnetizer, and the relative position of the strobe magnet to the strobe magnetizer is shifted in the width direction of the magnet card. As a result, the timing of occurrence is delayed compared to other detectors. The magnetic card reader is characterized by taking out as a strobe signal.