JPH01273266A - Magnetic card reader/writer - Google Patents

Abstract

PURPOSE:To eliminate the need of a belt so as to simplify the magnetic carrying mechanism of a magnetic card reader/writer and reduce the size and thickness of the reader/writer by carrying a magnetic card by means of rollers press- contacted with piezo-electric vibrators which produce rotational vibrations. CONSTITUTION:Lead terminals 10a and 10b and a common earth terminal 11 are respectively led out from the surface electrodes of the piezoelectric vibrators 9a and 9b and pressure angular pillar vibrator 8 of the magnetic card reader/ writer and the vibrator 8 is constituted in such a way that the vibrator 8 is formed to have a nearly square cross section and can make bending vibrations in orthogonal directions at the same frequency. By respectively applying voltages having the same resonance frequency as that of the vibrators 8 and phases which are different from each other by 90 deg. across the terminals 10a and 11 and terminals 10b and 11, both end sections of the vibrator 8 are caused to make rotational vibrations. In addition, disks 12a and 12b are adhered to both end sections of the vibrator 8 and supporting pins 13a and 13b are provided at the positions of the vibration nodes of the vibrator 8, so that the vibrator 8 can be rotated reversely when the phase of one-side drive voltage is changed by 180 deg..

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 H) that writes and reads signals to and from a magnetic card, and in particular, relates to a magnetic card reader/writer (hereinafter simply referred to as magnetic card H) that writes and reads signals to and from a magnetic card. The rotational vibration or elliptical vibration of a piezoelectric vibrator was used as the driving force. This relates to a magnetic card H using an ultrasonic motor.

[Conventional technology]

As magnetic cards R/liV, a system in which a magnetic head is fixed and the magnetic card is slid over the magnetic head at high speed has conventionally been widely used. FIG. 2 is a schematic diagram of a magnetic card transport mechanism of a conventional magnetic card R/W.

Turn the rotation of electromagnetic motor 1 to bell) 2m, 2b.

The information is transmitted to the magnetic card conveyance rollers 3a and 3b.

The magnetic card is conveyed by being sandwiched between the auxiliary rollers 4m and 4b.

The rotation of the electromagnetic motor 1 is also transmitted to the magnetic card pressing roller 7 by a bell 2c, and the magnetic card is conveyed in a state in which the magnetic card is pressed firmly against the magnetic field.

When using a magnetic card, it is necessary to keep the moving speed of the magnetic card 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 6 will change. Also, if the movement speed of the magnetic card varies when writing,
The position of the N-3 magnetic pattern recorded on the magnetic card varies and is read 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 p, N-8 magnetic patterns 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] The conventional magnetic card shown in FIG. 2 uses a large number of belts and rollers to convey the magnetic card, which makes the mechanism complicated.

The disadvantage is that the device becomes larger. Furthermore, from a performance standpoint, the magnetic head detects electromagnetic noise generated by the electromagnetic motor, so a shield is required to prevent electromagnetic noise from the electromagnetic motor.

If the shielding is incomplete, it is necessary to lower the recording density of the signal in order to ensure the error ratio, and the electromagnetic motor has been a bottleneck in miniaturizing the magnetic card RAW and improving the recording density.

The present invention provides a magnetic card transport mechanism to eliminate the drawbacks of the conventional magnetic card f'%/W. The seventh object is to provide a compact magnetic card R/v with high recording density using an ultrasonic motor that is simple and generates almost no electromagnetic noise.

[Means to solve the problem]

The magnetic card 1 of the present invention has an opening of two cup-shaped rotary rollers fixed to a rotating shaft so as to be able to freely rotate nine times, with disks or rings attached to both ends of a prismatic piezoelectric vibrator that vibrates twice or elliptically. of.

The disk or ring is placed so as to be in contact with the inner wall of the opening, an auxiliary roller is pressed against the cup-shaped rotating roller, and a magnetic card is sandwiched between the cup-shaped roller and the auxiliary roller. It is characterized by transporting cards. Furthermore, in the magnetic card H of the present invention.

The present invention is characterized in that a magnetic card pressing roller is pressed against the cup-shaped rotating roller via a rotation transmission roller, and the magnetic card pressing roller is pressed against the magnetic gap portion of the magnetic head.

〔Example〕

The magnetic card handle of the present invention will be explained in detail below with reference to the drawings. FIG. 1 is a schematic diagram showing an example of the structure of a piezoelectric vibrator that generates the driving force for conveying the magnetic card H of the present invention. Electrodes are provided on nine surfaces, and piezoelectric ceramic thin plates 9a and 9b polarized in the thickness direction are bonded.

From the surface electrodes of the piezoelectric ceramic thin plates 9a and 9b,
Lead terminals 10a and 10b are drawn out, respectively, and a common ground terminal 11 is drawn out from the metal prism 8. Since the metal prism 8 has a nearly square cross-section,
They flexurally vibrate in directions perpendicular to each other and at approximately the same resonant frequency. therefore.

When a voltage is applied to the terminal 10m-11 and the terminal 10b-11, the frequency of which is equal to the resonant frequency of the metal prism 8 and whose phase is different by 90 degrees, both ends of the metal prism 8 undergo rotational vibration. A disk 12a is provided at both ends of the metal square column 8.
, 12b are attached, and a support bin 13a is installed at the vibration node position of the parallel prism oscillator 8.

13b is provided.

The direction of rotation can be reversed by changing the phase of one of the drive voltages by 180°.

FIG. 3 is a perspective view of a cup-shaped rotating roller, in which a roller 15 having a cylindrical cavity 14 is rotatably supported by a rotating shaft 16. The inner diameter of the cavity 14 is slightly larger than the diameter of the disks 12a and 12b attached to both ends of the prismatic vibrator 8 shown in FIG.

FIG. 4 shows an ultrasonic motor constructed by combining the prismatic vibrator 8 shown in FIG. 1 and the cup-shaped rotating roller shown in FIG. In FIG. 4, when both ends of the prismatic vibrator 8 rotate and vibrate, nine discs 12a are generated.

12b contacts the inner walls of the cavities of the rotating rollers 15a and 15b and rotates the 0-rotation roller.

FIG. 5 is a diagram showing the principle of the card transport mechanism of the magnetic card W of the present invention, in which (a) is a perspective view and (b) is a sectional view seen from the lateral direction. In FIG. 5, the prismatic vibrator 8 shown in FIG.
It is fixed to the support stand 17 at b.

The cup-shaped rotating rollers 15a, 15b are pressed against an auxiliary roller 18 which is rotatably fixed. The rotating rollers 15m and 15b further include a rotation transmission roller 19f.
, when the prismatic vibrator 8 rotates and vibrates by being pressed against the card pressing roller 20 through the cup-shaped rotating roller 15ae15b and the auxiliary roller 18. The rotation transmission roller 19 and the card pressure contact roller 20 rotate.

The magnetic card is the cup-shaped rotating roller 15a.

It is held between the roller 15b and the auxiliary roller 18 and conveyed linearly.

In FIG. 5, the magnetic card 5 is pressed against the magnetic head 6 by a card pressing roller 20, which not only presses the magnetic card 5 against the magnetic head 6.

It also has the function of transporting magnetic cards.

As shown in FIG. 5, in the magnetic card carrier of the present invention, since the rotational vibration of the prismatic vibrator 8 is used as the driving force for conveying the magnetic card, there is no need for a belt at all, and the magnetic card conveyance mechanism is significantly improved. becomes easier. Further, in the magnetic card R/W of the present invention.

Since a piezoelectric vibrator is used as the source of the driving force for transporting the magnetic card, almost no electromagnetic noise is generated. Therefore, the noise voltage induced in the magnetic head is significantly reduced, and by reducing the gap of the magnetic head, a sufficient S/C ratio can be ensured even if the output voltage is reduced, and high recording density recording can be realized.

The above explanation was based on a case in which a prismatic resonator with a square cross section was used as a piezoelectric resonator that generates nine rotational vibrations. Needless to say, it may be used. Furthermore, the same effect can be obtained by using a polygonal plate or ring instead of the disk or ring attached to both ends of the prismatic vibrator 8.

〔Effect of the invention〕

As described above, in the magnetic card H according to the present invention, the magnetic card is conveyed by a roller that is pressed against a piezoelectric vibrator that vibrates in rotation.

A belt becomes unnecessary, the magnetic card conveyance mechanism becomes simple, and a small and thin magnetic card H can be realized. Furthermore, in the magnetic card according to the present invention, since the drive source for transporting the card is a piezoelectric vibrator, electromagnetic noise is generated less and recording and reproduction at high recording density is possible.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing an example of the structure of a piezoelectric vibrator that generates a driving force for conveying a magnetic card in a magnetic card holder W according to the present invention;
Fig. 2 is a schematic diagram of a magnetic card conveying mechanism of a conventional magnetic card dispenser, Fig. 3 is a perspective view of a cup-shaped rotating roller according to the present invention, and Fig. 4 is a diagram showing a rotational driving force for the magnetic card dispenser of the present invention. FIG. 5 is a schematic diagram of a configuration example of a magnetic card transport mechanism for a magnetic card νW of the present invention. 1...Electromagnetic motor e2 & e2b*2
c"・Belt. 3a, 3b...Roller for magnetic card conveyance, 4a. 4b:...Auxiliary roller, 5...Magnetic card, 6...
・Magnetic head, 7... Card pressure roller, 8...
・Piezoelectric prismatic vibrator, 9a, 9b...Piezoelectric vibrator *10
ae10 b-... Lead terminal, 11-... Earth terminal, 12a. 12 b...Disk, 13a, 13b...Support pin* 14a +14゛b...Cavity part* 15 m -
15b... cup-shaped rotating roller, 16a,
16 b...rotating shaft, 17-... support stand, 18...
...Auxiliary roller, 19...Rotation transmission roller, 2
'O...Roller for card pressure contact. Figure 2

Claims (2)

[Claims] (1) A disc or ring is attached to both ends of a prismatic piezoelectric vibrator with a square cross section that performs rotational vibration or elliptical vibration, and this opening is attached to a cup-shaped rotating roller that is rotatably fixed to a rotating shaft. The magnetic card is conveyed by placing the disc or ring in contact with the inner wall of the opening, pressing an auxiliary roller against the cup-shaped roller, and sandwiching the magnetic card between the cup-shaped roller and the auxiliary roller. A magnetic card reader/writer that is characterized by: (2) A card pressure contact roller is brought into pressure contact with the cup-shaped roller via a rotation transmission roller, and the card pressure contact roller is brought into pressure contact with a magnetic gap portion of a magnetic head. A magnetic card reader/writer.