JPH01264665A - Magnetic card reader-writer - Google Patents

Abstract

PURPOSE:To correctly detect the position and moving speed of a magnetic card and to execute high density recording and reproducing by detecting the magnetized condition of a magnetic bar with the magnetic detector of a magnetic card holder moved with an ultrasonic motor. CONSTITUTION:A magnetic card 5 is carried through a card holder 16 to be moved in a straight advance by means of the ultrasonic motor formed of a prism resonator 8, etc., and the recording and reproducing of the card 5 by a magnetic head 6 are executed. By a magnetic detector 17 to be provided on the holder 16 and to form a linear encoder, the magnetized condition by the N-S magnetic poles at an equal interval of a magnetic bar 15 is detected, the position and moving speed of the card 5 are correctly decided, and the recording and reproducing with high density of the magnetic card can be executed.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a magnetic card reader/writer (hereinafter referred to as magnetic card R/W) that writes and reads signals to and from a magnetic card. be.

[Prior Art] Generally, as a magnetic card R/W, a method in which a magnetic head is fixed and a magnetic card is slid on the magnetic head at high speed is often used.

FIG. 4 is a schematic diagram of a magnetic card transport mechanism of a conventional magnetic card R/W.

In this figure, a motor 51 for driving bells 1 to 52a and 52b is disposed at the bottom of frames 50a and 50b.

A pair of loading rollers 53a driven by a bell I are attached to one end of the frames 50a and 50b near the ceiling of the loading section.
and 54a, and another pair of unloading rollers 53b on the unloading side.
and 54b are pivoted by ball bearing link bearings ζj.

Furthermore, in the center of the frame, there are arranged a pressure roller that presses the surface of the card sent by the carry-in roller and a magnetic head that reads information from the pressed magnetic card. The rotation of the electromagnetic motor 51 is caused by the bells 1 to 52a and 52b to reach the card conveyance rollers 53a and 53b, and the card is transferred by sandwiching the magnetic card between the rollers 53a and 53b and the auxiliary rollers 54a and 54I). . On the other hand, the rotation of the electromagnetic motor 51 is transmitted to the card pressing roller 57 by a belt 52c of 53a.

The loaded card is pressed against a magnetic head, reads or writes recorded information while moving, and is conveyed out to conveying rollers 53b and 54b.

In such magnetic cards R and /W, the moving speed of the magnetic card must be controlled to be as constant as possible.

This is because, during reading, if the moving speed of the card varies, the magnitude and frequency of the output voltage from the magnetic head 56 will change. Furthermore, if the moving speed of the card varies during writing, the position of the N-3CR magnetic pattern recorded on the card will vary, resulting in reading out as an incorrect signal. Therefore, in conventional magnetic card R/W, an electromagnetic motor with a constant speed control function is used to keep the card moving speed constant.

Furthermore, when writing signals to the magnetic card l\, if the moving speed of the card is constant, the write position can be correctly controlled by keeping the frequency of the write signal constant.

In addition, in order to further improve the precision of the writing position on the card, an electromagnetic motor 51 or a card conveyance roller 57 is provided.
In some cases, a low reencoater is attached directly to the shaft.

[Problem to be solved by the invention] However, in the conventional magnetic card R/W shown in FIG. 4, for example, many belts and rollers are used to convey the card, so the This method has the drawbacks of being complicated and making the device large. Furthermore, in terms of performance, the magnetic head detects electromagnetic noise generated by the electromagnetic motor, so a shield is required to prevent the electromagnetic noise of the electromagnetic motor, and if this shield is incomplete, S In order to ensure the /N ratio, it is necessary to lower the magnetic density, and the electromagnetic motor has been a bottleneck in improving the recording density.

The technical problem of the present invention is to simplify the magnetic card transport mechanism in order to eliminate the drawbacks of conventional magnetic card R/M.
The present invention provides a small-sized, high-recording-density magnetic card R/W using a driving means that generates almost no electromagnetic noise and having a card position detector to further improve writing position accuracy.

[Means for Solving the Problems] According to the present invention, there is provided a conveyance unit that conveys a magnetic card by an ultrasonic motor, and a magnetic card conveyed by the conveyance unit that is pressed against a magnetic head by a pressure roller. A magnetic card reader/writer having a recording/reproducing unit that reads records from a magnetic card or writes to a magnetic cartridge pressed against the magnetic card, which includes a magnetic card boulder that moves together with the magnetic card, and a magnetic card boulder that moves along the direction of movement of the magnetic card. It has a magnetic bar with a high coercive force arranged in the length direction and a magnetic detector formed integrally with this magnetic card holder. A magnetic card reader/writer is obtained, characterized in that the magnetic bar is magnetized and the magnetic detector detects the moving speed of the card by detecting the magnetized state of the magnetic bar.

Here, in the present invention, an ultrasonic motor has a vibrating piece or a vibrating body that vibrates ultrasonically and a movable object that comes into contact with the vibrating piece, and uses displacement caused by mechanical resonance of the vibrating piece or the vibrating body. , refers to a mechanism that directly converts ultrasonic vibrations into rotations of a movable object.

That is, the conveying section has an ultrasonic motor made of a piezoelectric vibrator, and conveys the magnetic card by the elliptical motion including a circle of the piezoelectric vibrator. In addition, magnetic rods having a high coercive force arranged in the length direction along the direction of movement of the magnetic card are arranged at regular intervals of ten to several hundred Bm, N-S.
It is desirable that the magnet be magnetized so that the magnetic field is reversed.

1 action 1 The operation of the present invention will be explained.

The magnetic card I/W of the present invention is made of a metal prism forming a piezoelectric vibrator and a rotary vibrating member as an ultrasonic motor of a card transporting section. The driving principle of this ultrasonic motor is that a piezoelectric vibrator generates a voltage polarized in the thickness direction of a metal prism with a roughly square cross section, with electrodes formed on both sides of the longitudinal center of two adjacent surfaces. An example in which thin ceramic plates are bonded will be explained.

Lead terminals are respectively extended from the surface electrodes of the piezoelectric ceramic thin plates, and a common ground terminal is extended from the metal prisms. L of metal prism! Since the shaped surface is approximately square, the metal prisms bend and vibrate in directions perpendicular to each other at substantially the same resonance frequency. Each of these terminals has a frequency equal to the resonant frequency and a phase of 0 to 1.
When applying voltages that differ by 80°, preferably 90°, the ends of the metal prism move in an ellipse, including a circle, such as the planets of a planetary gear, or a fixed satellite in motion. This elliptical movement direction changes the phase of one drive voltage from 90° to 2
Reversal can be achieved by rotating by 70°, preferably 180°.

The magnetic card transport mechanism of the present invention supports a metal prismatic vibrator using support pins at the nodes of vibration, and at both ends where the amplitude is maximum,
A roller rotatably fixed to a rotating shaft is pressed against the roller. At both ends of the prismatic vibrator, friction parts 1" having a curvature larger than that of the rollers are attached in order to facilitate card insertion and stabilize card conveyance.

Both ends of the prismatic vibrator of the ultrasonic motor described above are in elliptical motion, so when the conveyance roller is pressed against them, the conveyor 17-ra rotates, and the magnetic card sandwiched between the prismatic vibrator and the conveyor 17-ra is move in a straight line.

Furthermore, when a magnetic card is inserted at the same time, the leading end of the magnetic card presses the card holder.

The magnetic card holder is pressed against the card tip by a spring and moves together with the magnetic card.

This magnetic cart halter is integrally formed with a magnetic detector for detecting the magnetic state of the magnetic bar, and by reading the magnetization pattern of the magnetic bar, the position of the card can be determined i:. You can know.

Furthermore, if the magnetization patterns of the magnetic bars are arranged at equal intervals, the frequency of the output signal is proportional to the speed of movement, so the speed of movement of the magnetic card can be determined.

In such a magnetic card R/W, the elliptical motion of an ultrasonic motor, that is, a prismatic vibrator is directly used to transport the card, and the number of rollers for card transport is reduced, making the card transport mechanism much simpler. Ultrasonic motors generate almost no electromagnetic noise because they are voltage driven. Therefore, the noise voltage induced in the magnetic head is significantly reduced and the magnetic gap is made smaller, so even if the output voltage is reduced, signals can be easily distinguished and high-density recording can be achieved.

In addition, in the magnetic card R/Vll of the present invention, the magnetic card is It becomes possible to accurately detect the position or moving speed of the object, and high-density recording becomes possible from this point of view as well.

In addition, in the magnetic card R/W of the present invention, in addition to the rectangular vibrator as in this example, a disc-shaped vibrator or a rectangular vibrator is used.
In the case where elliptic vibration or ζJ elliptic vibration is generated, the magnetic card R/'W can be realized in the same manner.

[Example] Embodiments of the present invention will be described with reference to the drawings.

Example 1-1 Example 1 of the present invention will be described.

FIG. 1 shows a magnetic card according to an embodiment of the present invention]? FIG. 2 is a schematic diagram, without showing the structure of a piezoelectric vibrator, of a conveyance section for conveying a card of the /W. In this figure, electrodes are formed on both longitudinally central portions of two adjacent surfaces of a metal prism 8 having a substantially square cross section, and piezoelectric ceramic thin plates 9a and 9b polarized in the thickness direction are adhered. Piezoelectric ceramic thin plate 9a
, 9b lead terminals 10a, 9b, respectively.
10b is drawn out, and a common ground terminal 11 is also drawn out from the metal square column 8. Since the cross-sectional shape of the metal prism 8 is almost square, the metal prism 8 has vibration surfaces perpendicular to each other, and due to vibration waves traveling in the longitudinal direction,
Bending vibrations at substantially equal resonant frequencies. Therefore, when a voltage equal to the frequency or resonance frequency and having a phase different by 90 degrees is applied to the terminals 10a-11 and 10b-11, the two types of vibrations are synthesized, and both ends of the metal prism 8 contain circles in the same direction. Performs elliptical motion (elliptical vibration). The direction of movement is
It can be reversed by changing the phase difference of the driving voltages by 90°.

Example 2゜ Example 2 of the present invention will be described.

FIG. 2 is a principle diagram of a magnetic card transport mechanism according to an embodiment of the present invention. The metal prismatic vibrator 8 shown in the first figure is supported at its vibration nodes by support pins 12a and 12b, and friction members 14a and 14b are provided at both ends where the amplitude is maximum, and rollers are fixed to a rotating shaft 13c so as to be able to rotate freely once. 13a and 13b
are in pressure contact. Organic friction members 14a and 14b having a larger curvature than the rollers 13a and 13b are attached to both ends of the prismatic vibrator 8 to facilitate card insertion and stabilize card conveyance. There is. Second
In the figure, since both ends of the prismatic vibrator 8 are moving in an elliptical manner, when the rollers 13a and 13b are pressed against each other, the rollers 13a and 13b rotate, and the friction member 1 of the prismatic vibrator 8 is rotated.
The magnetic card 5 sandwiched between the rollers 4a and 14b and the rollers 13a and 13b moves linearly.

Example 3゜ Example 3 of the present invention will be described.

FIG. 3 is a schematic diagram of a magnetic card R/W according to an embodiment of the present invention.

In this figure, a magnetic head 6 is placed on the transport path of the magnetic card 5.
is arranged, and a card pressing roller 7 is pressed against the magnetic gap portion of the magnetic head. Further, a magnetic bar 15 having a high coercive force and capable of being magnetized in the length direction is arranged parallel to the direction of movement of the card. The magnetic bar 15 has a thickness of several tens of μm.
It is magnetized so that N1l--S is reversed several hundred micrometers from the point.

In FIG. 3, when the card 5 is inserted, the leading end of the card pushes against the card holder 16. The card holder 16 is pressed against the front end of the card by a spring having a loose spring constant, and moves together with the card.

However, in FIG. 3, the card holder 16 and the card 5 are shown separated.

A magnetic detector 17 for detecting the magnetized state of the magnetic bar 15 is integrally formed in the card holder 16.
The magnetic detector 17 detects N-3 of the magnetization pattern of the magnetic bar 15.
By counting the number of changes, the position of the card can be determined accurately.

Furthermore, if the magnetization pattern of the magnetic bar 15 described above is magnetized at equal intervals, the frequency of the output signal from the magnetic detector 17 is proportional to the moving speed, so that the moving speed of the card can be determined.

As shown in FIG. 3, in the magnetic card R/W according to the embodiment, the elliptical motion of the prismatic vibrator 8 is directly utilized for conveying the card 5, so a drive transmission belt is completely unnecessary. Furthermore, the number of rollers for conveying cards is reduced, making the card conveyance mechanism much simpler. Furthermore, since the prismatic vibrator shown in FIG. 1 is driven by voltage, it hardly generates electromagnetic noise. Therefore, the noise voltage induced in the magnetic head is significantly reduced, and even if the output voltage is reduced by making the magnetic gap smaller, signals can be easily distinguished and high-density recording can be achieved.

In addition, in the magnetic card R/W of the embodiment, the magnetic card R/W is performed by detecting the magnetized state of magnetic bars arranged parallel to the moving direction of the magnetic card and magnetized at equal intervals in the length direction. It becomes possible to accurately detect the position or moving speed, and high-density recording is also possible from this point of view.

The above explanation is about the case where a prismatic vibrator with a square cross section is used as a piezoelectric vibrator that generates elliptical vibration. It goes without saying that similar magnetic cards R and /W can be realized in various cases.

[Effects of the Invention] As explained below, according to the present invention, the magnetic card is directly transported by a piezoelectric vibrator that vibrates elliptically, so the drive transmission bells 1 to 1 are unnecessary, and the card transport mechanism is simplified. As a result, a small and thin magnetic card R/W can be provided.

Furthermore, according to the present invention, since the moving position and moving speed of the magnetic card are detected using an externally placed magnetic linear encoder, it is possible to write signals with high precision, allowing for high recording density. A magnetic card R/W capable of recording and reproducing can be provided.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing the configuration of a piezoelectric vibrator for transporting a magnetic card in a magnetic card reader/writer according to an embodiment of the present invention, and FIG. FIG. 3 is a schematic diagram showing the overall configuration of a magnetic card reader/writer according to an embodiment of the present invention, and FIG. 11 is a diagram showing the overall configuration of a conventional magnetic card reader/writer. FIG. -1,5- In the figure, 5 and 55 are magnetic cards, 6 and 56 are magnetic heads, 7 and 57 are magnetic card pressure contact rollers, 8 is a prismatic vibrator, 9a and 9b are piezoelectric ceramic thin plates, 10a and 1
0b is a lead terminal, 11 is a ground terminal. 12a and 12b are support pins, 13a and 13b are rollers, 14a and 14b are friction members, 15 is a magnetic bar, 16
is a card holder, 17 is a magnetic detector, 51 is an electromagnetic motor, 52a, 52b and 52c are belts, 53a and 5
3b is a magnetic card conveyance roller, and 54a and 54b are auxiliary rollers.

Claims (1)

[Claims] 1. A conveyance unit that conveys a magnetic card by an ultrasonic motor, and a pressure roller that presses the magnetic card conveyed by the conveyance unit against a magnetic head to read records from the pressed magnetic card or A recording device that writes to a pressure-contact magnetic card.
a magnetic card reader/writer having a reproduction section, a magnetic card holder that moves together with the magnetic card;
A magnetic bar having a high coercive force is arranged in the length direction along the magnetic card moving direction, and a magnetic detector is formed integrally with the magnetic card holder, and N - A magnetic card reader characterized in that the card is magnetized so that the S magnetic pole is reversed, and the magnetic detector detects the moving speed of the card by detecting the magnetized state of the magnetic bar. Writer.