JPS6349776Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a card reading device that reads data from a magnetic card on which data is recorded by punching holes.

As shown in FIG. 1, this type of card reading device includes a device main body 1, a plurality of magnetic detection elements (Hall elements and magnetoresistive elements) 2, and a plurality of permanent magnets 3 for detection.
are arranged facing each other, and a hole H is formed so that a magnetic card C on which data is recorded is inserted between the magnetic detection element 2 and the detection permanent magnet 3. The detection permanent magnet 3 is mounted on a base plate (magnetic plate) 4. Then, the magnetic field directed from the detection permanent magnet 3 toward the magnetic detection element 2 is transmitted or blocked depending on the presence or absence of the hole H in the card C, so that the data on the card C is read by the magnetic detection element 2. In the figure, numeral 5 denotes an amplifier box containing an amplifier circuit 6, and the detection signal of the magnetic detection element 2 amplified by the amplifier circuit 6 is inputted to a reading circuit (not shown) via a cable 7.

Conventionally, in such a card reading device, the number of permanent magnets 3 for detection corresponds to the number of magnetic detection elements 2.
is provided. Therefore, if the detection permanent magnets 3 are placed close to each other in order to increase the data density of the card C, the magnetic fields will interfere with each other, and the magnetic field of the detection permanent magnets 3 will be placed in the center as shown in FIG. The closer it is, the stronger it becomes in the vertical direction, and the more it is located at the edge, the weaker it is in the vertical direction. Therefore, regardless of the slight positional deviation of the hole H in the card C, there was a problem in that the magnetic detection element 2 corresponding to the central detection permanent magnet 3 detected data earlier than those located in the periphery. .

This idea was made in consideration of the above circumstances, and by providing a correction permanent magnet around the detection permanent magnet in addition to the detection permanent magnet corresponding to the magnetic detection element, the detection permanent magnet An object of the present invention is to provide a card reading device that can bias the magnetic field toward a magnetic detection element, strengthen the magnitude of the magnetic field of a permanent magnet for detection with respect to the magnetic detection element, and make it uniform. do.

This invention will be explained below based on the embodiments shown in FIGS. 3 to 5. Note that the same parts as those in FIGS. 1 and 2 described above are given the same reference numerals, and the explanation thereof will be omitted.

FIGS. 3 and 4 show an embodiment of this invention.

In this embodiment, detection permanent magnets 3a and 3b (shown with diagonal lines in the figure) are arranged in a T-shape on the base plate 4, and magnets (shown with white lines in the figure) surround the T-shape. A plurality of correction permanent magnets 8 are arranged. These detection permanent magnets 3a, 3b
and the correction permanent magnet 8 both have the same polarity, with the upper pole being the north pole.

Card C has a number of holes for data recording, and is inserted from above in the direction of the arrow in FIG. The holes drilled in this card C are the first digit on the front side in the insertion direction, that is, the ones lined up on the left and right at the bottom in Figure 4, and the second and third digits along the insertion direction. Digit...The nth digit is used. The center hole for the first digit is designated as hole _H1 for the detection bit of the digit, and the other holes are designated as hole _H2 for the upper bit. In response to this,
Among the detection permanent magnets 3a and 3b, the detection permanent magnets 3a arranged in a row above and below the center in FIG.
The other permanent magnet 3b is used for detecting the hole _H1 of the card C, and the other permanent magnet 3b is used for detecting the hole _H2 of the card C.
It is said to be used for detection. A magnetic detection element 2 is arranged opposite to these detection permanent magnets 3a and 3b, similar to the one shown in FIG. 1 described above. That is, the magnetic detection element 2 is arranged in a T-shape so as to be opposed to that of the detection permanent magnets 3a and 3b.

Therefore, in this way, the detection permanent magnets 3a, 3
By disposing the correction permanent magnet 8 around b, as shown in FIG. 3, the detection permanent magnets 3a, 3 are surrounded by the correction permanent magnet 8.
The magnetic field b becomes strong and uniform in the vertical direction due to mutual interference with the magnetic field of the correction permanent magnet 8. Therefore, the accuracy of detecting holes in the card C increases. As a result, the magnetic detection element 2 corresponding to the detection permanent magnet 3a sequentially and accurately detects the position of the hole _H1 when the card C is inserted in the direction of the arrow in the figure, and the magnetic detection element 2 corresponding to the detection permanent magnet 3b Detection element 2
is the hole of the 1st to 2nd digit that passes below it
Accurately detect the presence or absence of _H2 in sequence. Then, the data recorded on the card C can be accurately read from both of these detection signals.

By the way, since the detection accuracy of the holes in the card C is high, it is possible to accurately read data even from relatively small holes. Therefore, it is possible to increase the density of recorded data on the card C. Further, by reading data in an order that corresponds to subtle positional deviations of holes, the order can be accurately determined. Therefore, in this embodiment, the hole _H1 for the digit detection bit in the card C is made smaller than the hole _H2 for the information bit, and the detection order of the holes _H1 and _H2 is determined. That is, when the card C is inserted, first, the hole _H2 for the information bit of the first digit faces the detection permanent magnet 3b and is detected first, and then the hole _H1 for the detection bit of the first digit faces the detection permanent magnet 3b. 1 from the top in Figure 4
It is detected facing the th detection permanent magnet 3a.
After that, hole _H2 for the information bit of the second digit is detected, and then hole _H1 for the detection bit of the digit is detected.
It is detected facing the second detection permanent magnet 3b from the top in the figure. Thereafter, the detection is performed in the same order. Therefore, by utilizing such a detection order, data can be reliably read, for example, by a latch circuit that uses the detection signal of the hole _H1 as a clock command. Furthermore, when the card C is pulled out, the same detection order is used. From this, for example, insert card C halfway and then pull it out slightly.
Even if it is inserted again, the latch circuit uses the detection signal of hole _H1 as the clock command.
Data can be read accurately without changing the order.

In addition, in this embodiment, the hole for the detection bit of the digit
The fact that H ₁ is placed in the center of card C means that
Since the same magnetic detection element 2 can detect digits of data regardless of the front and back states of the card C, this is extremely advantageous in terms of simplifying the configuration. In addition, in order to read the data regardless of the front and back states of the card C, for example, use the hole H ₂ for the information bit.
A reading circuit is set up to distinguish between the front and back of the card C, and by detecting this with the magnetic detection element 2, the reading circuit processes data according to the front and back states of the card C.

FIG. 5 shows another example of the arrangement of the detection permanent magnets 3a, 3b and the correction permanent magnet 8. In this example,
There are 8 permanent magnets 3a for detection in hole H ₁ of card C.
Four detecting permanent magnets 3b in the holes _H2 are arranged in a row and are shifted vertically in the figure. A total of six correction permanent magnets 8 are arranged so as to surround the detection permanent magnets 3a and 3b arranged in a substantially T-shape in this manner. Also in this example, the magnetic fields of the detection permanent magnets 3a and 3b become stronger in the vertical direction due to mutual interference with the magnetic field of the correction permanent magnet 8, and the detection accuracy of the hole in the card C increases. Therefore, in this example, by shifting the detection permanent magnets 3a up and down in the figure and reducing the distance between them in the left and right direction, the recording data density of the card C, especially in the width direction, is increased. . Also in this example, the card C is inserted from above in the figure, and the recorded data is stored in the detection permanent magnet 3.
It is read by the magnetic detection element 2 facing a and 3b.

In addition, the number and arrangement form of the correction permanent magnets 8 are not limited to the above-mentioned embodiments; in short, they are located around the detection permanent magnets 3a, 3b, and Any arrangement configuration may be used as long as the magnetic field is biased towards the corresponding magnetic detection element 2 through mutual interference. For example, the detection permanent magnets 3a, 3b may be divided into a plurality of groups, and the correction permanent magnets 8 may be arranged around each group, or the correction permanent magnets 8 may be arranged with respect to the detection permanent magnets 3a, 3b. The height and direction of the can be selected as appropriate.

As explained above, the card reading device according to this invention has a configuration in which the magnetic field of the permanent detection magnet is biased toward the magnetic detection element by mutual interference of magnetic fields around the permanent magnet for detection. Therefore, it is possible to increase the magnitude of the magnetic field of the permanent magnet for detection with respect to the magnetic detection element and to make it uniform.
As a result, the accuracy of detecting holes drilled in the card increases, and it becomes possible to increase the density of recorded data on the card. In addition, the data is read in an order that corresponds to the slight positional deviation of the holes drilled in the card.
It is also possible to accurately determine the order.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram of a card reading device, FIG. 2 is an explanatory diagram of the main parts of a conventional card reading device, FIGS. 3 and 4 show an embodiment of this invention, and FIG.
4 is an explanatory diagram of the arrangement of the detection permanent magnet and correction permanent magnet. FIG. 5 is an illustration of the arrangement of the detection permanent magnet and correction permanent magnet in another embodiment of this invention. It is an explanatory diagram of a deployment form. 1... Apparatus body, 2... Magnetic detection element, 3a,
3b... Permanent magnet for detection, 8... Permanent magnet for correction.

Claims (1)

[Scope of utility model registration request] A magnetic sensor in which a plurality of magnetic detection elements and a plurality of detection permanent magnets are arranged facing each other in the main body of the device, and data is recorded by drilling holes between these magnetic detection elements and the detection permanent magnets. In a card reading device that moves a card and reads data recorded on the card based on the transmission or interruption of the magnetic field depending on the presence or absence of a hole, a detection permanent magnet is placed around the detection permanent magnet to detect the magnetic field. A card reading device comprising a correction permanent magnet that biases the magnetic field of the permanent magnet toward a magnetic detection element.