JPH0293884A - Magnetic card reader/writer - Google Patents

Abstract

PURPOSE:To eliminate a belt, to simplify the carrying mechanism of a magnetic card and to realize a compact and thin magnetic card reader/writer by executing the carriage of the magnetic card by a roller, which contacts to a piezoelectric oscillator to execute elliptical oscillation with pressure, and an auxiliary roller which contacts this roller with pressure. CONSTITUTION:A carrying part has a first ultrasonic motor 14 and an auxiliary roller 16, which are mutually faced, and a moving part has a second ultrasonic motor 15 which contacts a magnetic head 6 with pressure. In the first ultrasonic motor 14, a rotary rotor, which is provided in the both edges of a stick-shaped piezoelectric elliptical oscillator, executes rotational operation. Then, the magnetic card is carried while being sandwiched by the motor and the auxiliary roller 16 which is faced and arranged. The carried magnetic card contacts the magnetic head 6 by a rotary rotor 13' of the second ultrasonic motor 15 which has the same mechanism. Then, the magnetic card is moved and the recording and reproducing of the magnetic card is executed by the magnetic head 6. Thus, the carrying mechanism of the magnetic card can be simplified and the generation of an electro-magnetic noise can be reduced.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a magnetic card reader/writer (hereinafter simply referred to as magnetic card R/W) that writes and reads signals to and from a magnetic card, and particularly relates to a magnetic card reader/writer (hereinafter simply referred to as magnetic card R/W). The present invention relates to a magnetic card R/W using an ultrasonic motor that utilizes the circular motion or elliptical motion of a piezoelectric vibrator as the driving force for conveyance.

[Prior Art] Conventionally, 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 has been widely used.

FIG. 6 is a schematic diagram of a magnetic card transport mechanism of a conventional magnetic card R/W.

In this figure, a rotating belt 52a of an electromagnetic motor 51,
52b, magnetic card conveying rollers 53a, 53b
and the auxiliary roller 54a.

The magnetic card is conveyed by sandwiching the magnetic card between the card and the card 54b. The electromagnetic motor 51 is rotated by a belt 52c.
The magnetic card pressure is also transmitted to the magnetic card pressing roller 57, and the magnetic card is conveyed in a state in which the magnetic card is pressed against the magnetic head.

In magnetic card R/W, the moving speed of the magnetic card needs to be as constant as possible. If the moving speed of the magnetic card varies when reading signals, the magnitude and frequency of the output voltage from the magnetic head 56 will change. Further, if the moving speed of the magnetic card varies during writing, the position of the N-8 magnetic pattern recorded on the magnetic card varies, resulting in reading out as an incorrect signal. Therefore, in conventional magnetic card R/W,
In order to keep the moving speed of the magnetic card constant, a motor with a constant speed control function is used as the magnetic card transport motor. If the moving speed of the magnetic card is constant, the position of the N-S magnetic pattern can be accurately controlled by keeping the frequency of the write signal constant when writing signals to the magnetic card.

[Problems to be Solved by the Invention] In the conventional magnetic card R/W shown in Fig. 6, many belts and rollers are used to convey the magnetic card, which makes the mechanism complicated and complicated. However, the disadvantage is that the device becomes large.

Furthermore, in terms of performance, the magnetic head detects the electromagnetic noise generated by the electromagnetic motor, so a shield is required to prevent electromagnetic noise from the electromagnetic motor, and if the shield is incomplete, S In order to secure the /N ratio, it is necessary to lower the signal recording density, and the electromagnetic motor has been a bottleneck in miniaturizing the magnetic card R/W and improving the recording density.

Therefore, the technical problem of the present invention is to solve the problem of conventional magnetic card R/W.
In order to eliminate the above disadvantages, it is an object of the present invention to provide a magnetic card R/W that has a simple magnetic card transport mechanism and generates almost no electromagnetic noise.

[Means for Solving the Problems] According to the present invention, there is provided a conveyance section that conveys a magnetic card while sandwiching it, a magnetic head that performs recording and reproduction on the magnetic card, and a magnetic card that is pressed into contact with the magnetic head. In the magnetic card reader/writer, the magnetic card reader/writer includes a first ultrasonic motor that rotates first rotors provided at both ends of a first rod-shaped piezoelectric elliptical vibrator. and an auxiliary roller disposed opposite to the first rotary rotor, and the transfer section is configured such that the second rotary rotor provided at both ends of the second rod-shaped piezoelectric elliptical vibrator rotates. A magnetic card reader/writer is obtained, which is characterized by having a second ultrasonic motor that performs.

[Function] In the present invention, the transport section includes a first ultrasonic motor and an auxiliary roller that face each other, and the transfer section includes a second ultrasonic motor that presses against the magnetic head.

In the magnetic card reader m-writer having such a configuration, the first ultrasonic motor rotates the first rotating rotor provided at both ends of the first rod-shaped piezoelectric elliptical vibrator. The magnetic card is conveyed while being pinched by an auxiliary roller disposed opposite to the first rotating rotor. Further, the transported magnetic card is pressed against the magnetic head and transported by a second rotating rotor of a second ultrasonic motor having the same mechanism. At this time, the magnetic card is
Recording and reproduction are performed by a magnetic head.

[Example] The magnetic card reader/writer (magnetic card R/W) of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a perspective view showing the structure of a card transport mechanism of a magnetic card R/W constructed using two ultrasonic motors.

In FIG. 1, ultrasonic motors 14 and 15 are used. The rotating roller 13'' of the ultrasonic motor 15 serves as a roller for pressing the magnetic card against the magnetic head and a roller for transporting the magnetic card. Roller 16.16° is pressed.

FIG. 2 is a schematic diagram showing an example of the structure of a piezoelectric vibrator that generates a driving force for transporting a magnetic card in the magnetic card R/W of the present invention. 31, 32°, 33.34 are formed at four equal positions in the circumferential direction.

FIG. 3 is a cross-sectional view of the piezoelectric ceramic cylinder 11 of FIG. 2, and in FIG.
34 is a child terminal, and electrodes 31 and 33 are one terminal, and the direction of polarization is shown when polarization treatment is performed by applying a DC voltage.

Figure 3(b) shows the cross-sectional direction of a piezoelectric ceramic cylinder that has been polarized as shown in Figure 3(a) when a DC voltage is applied with electrodes 33. It shows the direction of the distortion that occurs. In FIG. 3(b), the voltage is applied in the direction indicated by the solid arrow, so due to the interaction with the polarization direction, between the electrodes 32 and 33,
Shrinkage distortion occurs. As a result, in FIG. 3(b), the lower side of the piezoelectric ceramic cylinder is bent in the longitudinal direction so as to bulge. Furthermore, when the polarity of the applied voltage is reversed, the direction of bending is also reversed.

FIG. 4 is an explanatory diagram of the vibration state when an alternating current voltage is applied to the piezoelectric ceramic cylinder 11 of FIG. 2. In Fig. 4, the electrodes 33 and 34 and the electrodes 31 and 32 are connected, respectively, and the piezoelectric ceramic cylinder 11 is connected between them as shown in Fig. 4(a).
As shown in , bending vibration occurs in the direction of the arrow. In FIG. 4, when electrodes 31 and 34 and electrodes 32 and 33 are connected and an alternating voltage with a frequency equal to the resonance frequency is similarly applied, the piezoelectric ceramic cylinder 11 moves in the direction of the arrow in FIG. 4(a). Generates bending vibration in the right angle direction. Therefore, by shifting the phases of the bending vibrations in the two directions shown above by 90 degrees, specifically, the phase of each drive voltage can be changed by 90 degrees.
By shifting the piezoelectric ceramic cylinder 11 by 0'', it is possible to excite an elliptical motion including a circle as shown in FIG. 4(b) at both ends of the piezoelectric ceramic cylinder 11.

FIG. 5 is a schematic diagram showing an example of the structure of an ultrasonic motor used in the magnetic card R/W of the present invention. 13 is installed in the cavity with the end of the piezoelectric ceramic cylinder 11 inserted with a minute interval. In FIG. 5, when the end of the piezoelectric ceramic cylinder 11 performs an elliptical motion, it rubs against the inner wall of the cavity of the cup-shaped rotor 13, causing the cup-shaped rotor 13 to rotate.

When configured using two ultrasonic motors shown in Fig. 5,
This becomes the card transport mechanism of the magnetic card R/W shown in FIG. In the card transport mechanism for magnetic card RZW shown in Fig. 1, an ultrasonic motor is used to drive the rollers to press the magnetic card, so the end of the magnetic card is transported to the magnetic gap of the magnetic head. This makes it possible to record signals over the entire length of the magnetic card. Magnetic card R/W of the present invention shown in FIG.
Ultrasonic motor 1 used in card transport mechanism for
By making the resonant frequencies of the piezoelectric vibrators used in the piezoelectric vibrators 4 and 15 substantially equal, parallel driving is possible using the same drive circuit.

[Effects of the Invention] As shown above, in the magnetic card reader/writer according to the present invention, the magnetic card is conveyed by a roller that is pressed against a piezoelectric vibrator that vibrates in an elliptical pattern including a circle, and an auxiliary roller that is pressed against the piezoelectric vibrator. This eliminates the need for a belt, simplifies the magnetic card conveyance mechanism, and enables the realization of a compact and thin magnetic card reader/writer.

Furthermore, in the magnetic card reader/writer according to the present invention, since the drive source for card transport is a piezoelectric vibrator, electromagnetic noise is generated less and high recording density recording and reproduction is possible.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the configuration of the main parts of a magnetic card reader/writer according to an embodiment of the present invention, FIG. 2 is a diagram showing the structure of a piezoelectric vibrator according to an embodiment of the present invention, and FIG. a) and (b) are cross-sectional views showing the relationship between voltage application and strain of the piezoelectric vibrator in Fig.
) and (b) are perspective views showing the operating principle of the piezoelectric vibrator, FIG. 5 is a perspective view showing an ultrasonic motor used in a magnetic card reader/writer according to an embodiment of the present invention, and FIG. 6 is a perspective view showing a conventional ultrasonic motor. FIG. 1 is a perspective view showing the configuration of a magnetic card reader/writer according to an example. In the figure, 11 is a ceramic cylinder, 12 is a support frame, 13.
13- is a rotating roller, cup-shaped rotor 14.15 is an ultrasonic motor, 16.16- is a magnetic card conveying roller, 51 is an electromagnetic motor, and 52a. 52b and 52c are rotating belts, 53a and 53b are magnetic card conveying rollers, and 54a and 54b are auxiliary rollers.
56 is a magnetic head, and 57 is a roller for pressing the magnetic card.

Claims (1)

[Claims] 1. A magnetic card reader/writer comprising: a transport section that transports a magnetic card while sandwiching it; a magnetic head that performs recording/reproduction on the magnetic card; and a transport section that transports the magnetic card while being in pressure contact with the magnetic head. The conveying unit is arranged to face a first ultrasonic motor in which first rotating rotors provided at both ends of a first rod-shaped piezoelectric elliptical vibrator rotate, and the first rotating rotor. auxiliary rollers, and the transfer section includes a second ultrasonic motor that rotates second rotors provided at both ends of a second rod-shaped piezoelectric elliptical vibrator. Card reader/writer.