JPH0383750A - Card driving device - Google Patents

Abstract

PURPOSE:To roll a roller at a high speed with low rotation and high power and carry a card with stability by connecting a supersonic motor, which gives both ends of a cylinder circular oscillation, to the shaft of the roller, to which motive force is then transferred. CONSTITUTION:A card 1 is carried via roller 4 which is rolled in contact with the carrying-direction side portion of the card 1 and a roller 3 which is rolled in contact with the plane portion of the card 1. At this time, a supersonic motor 6 which gives both ends of a cylinder circular oscillation is connected to the shaft 8 of the roller 3, to which motive force is then transferred. With the use of such a supersonic motor 6 as a driving source, small-inertia driving force of lower rotation and high power can be obtained and the card 1 can be stably carried.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a card drive device for transporting cards such as magnetic cards, IC cards, and optical cards.

[Conventional technology]

For example, by moving an optical card back and forth and moving an optical head in a direction perpendicular to the direction of the back and forth movement, information can be optically recorded on the optical card, or information recorded on the optical card can be optically recorded. Information recording and reproducing systems using readable optical cards have been proposed.

In such an information recording and reproducing system for optical cards, the driving force of the motor is transmitted to the rollers for moving the optical card through various gears, and the rotational speed of the motor is reduced to increase the speed at which the optical card moves. A calibrated card drive is used.

[Problems to be Solved by the Invention] However, although the conventional card drive device described above uses a motor as a drive source, it has a relatively large capacity, resulting in an increase in cost and high power consumption. Furthermore, because the inertia of the motor increases the distance it takes to stop the optical card, there is a problem in that the moving speed of the optical card cannot exceed a certain level. Furthermore, even when the optical card is stopped and the direction of movement is reversed, the shock is large and the optical card cannot be moved accurately at a constant speed. Furthermore, when the motor is battery-driven, there is a problem that there is a limit to the number of rotations of the motor.

The present invention has been proposed to solve the above-mentioned problems, and an object of the present invention is to provide a card drive device that can realize proper and stable movement of an optical card.

[Means and operations for solving the problems] In order to achieve the above object, the present invention includes a roller that rotates while coming into contact with the side portion of the card in the conveyance direction, and a rotating body that rotates while coming into contact with the flat surface of the card. In the guard drive device for transporting cards through the rotating body, the guard drive device includes:
The structure is such that an ultrasonic motor that vibrates circularly at both ends of a cylindrical body is connected coaxially.

By using the ultrasonic motor as a drive source in this way, a driving force with low rotation, high output, and small inertia can be obtained.

〔Example〕

FIG. 1 shows a first embodiment of the present invention, and is an overall perspective view of a card drive device. The card 1 is mounted on a drive device so as to move in the direction of arrow A. The loaded card 1 is pressed down near both ends of the top surface of the flat part by upper rollers 2, and near both ends of the bottom surface by rubber rollers 3.
The card can be moved in the direction of arrow A while the flat surface of the card is held between an upper roller 2 and a rubber roller 3. Note that the roller shaft end of the rubber roller 3 is biased by a spring 7 in a direction to clamp the flat part of the card I.

On the other hand, rollers 4 are provided on both sides of the card in the movement direction so as to be movable in the direction of arrow A while holding the card 1 therebetween. Note that the shaft of the roller 4 is biased by a spring 5 in a direction to clamp the card 1.

The card 1 is moved by transmitting rotational power to the rubber roller 3, and for this purpose the rubber roller 3
An ultrasonic motor 6 is connected coaxially with a roller shaft 8 which is provided through the shaft.

FIG. 2A is an enlarged sectional view showing a state in which the rubber roller 3 and the ultrasonic motor 6 are connected. The rubber roller 3 moves integrally with the roller shaft 8 and moves while holding the card 1 between the upper roller 2, and both ends of the card 1 are provided so as to protrude toward the outer circumferential direction of the roller shaft 8 on the piezoelectric element 16 side. The card 1 is positioned by a guide 9 on the opposite side, and a guide frame 10 biased in a direction in which the side of the card 1 is pushed by a spring 11 which is a spring holder at one end with a spring holder 12 on the opposite side.

A cylindrical piezoelectric element 16 provided in a non-contact manner on the outer periphery of an extension shaft 8a continuous with the roller shaft 8 of the rubber roller 3 is a guide 9.
and a push frame 14 which is biased toward the rubber roller 3 by a spring 13 which is a spring holder 15. The piezoelectric element 16 has a substantially cylindrical shape, and terminals 17 are provided at required intervals so as to straddle this. The positions are two on both sides where almost no distortion occurs in the piezoelectric element 16 during driving. FIG. 2B is a front view showing the positional relationship between the piezoelectric element 16 and the terminal 17. FIG. 2C is a front view showing a state in which an extension shaft 8a continuous to the roller shaft 8 is rotatably supported. When the piezoelectric element 16 is driven, rotational motion due to strain is transmitted to the guide 9 and the push frame 14, and the roller shaft 8 rotates, thereby allowing the card 1 to move.

To explain the driving principle of an ultrasonic motor having a piezoelectric element, an ultrasonic motor has divided electrodes parallel to the length direction at positions that equally divide the circumference of the surface of the piezoelectric element of the cylindrical body that forms the ultrasonic motor. Therefore, when a voltage is applied to each of them, distortion occurs in the cross-sectional direction.

Expansion and contraction in a predetermined direction occurs depending on the direction of the electric field due to the applied voltage, producing bending resonance. Furthermore, when the phase of the applied voltage that excites the bending resonance is shifted by 90", both ends of the piezoelectric vibrate circularly or elliptically. In this case, if the phase of one applied voltage is changed by 180°, the direction of the circular or elliptical vibration is reversed.

Therefore, if a rotating roller is pressed against both ends of the piezoelectric element, the rotating roller can be rotated. This ultrasonic motor has the advantage of having a simple structure, small size, and low price. Also, since it has low rotation and high output, it does not require adjustment with gears. It also has the advantage of transmitting power without going through gears and having a small weight of rotating parts, resulting in low inertia.

FIG. 3 is an enlarged perspective view of the ultrasonic motor 6, and electrodes 16a are provided on the surface of the piezoelectric element 16 at positions that equally divide the circumference of the surface into four, extending parallel to the length direction.

There are four electrodes, one terminal 17a is attached to one electrode 16a.
is conductively bonded, and the other terminal 17b is conductively bonded to the other electrode. In the drawing, only one electrode 16a is visible and the other electrode is hidden. For conductive bonding, solder is applied to the part of the electrode that protrudes in the circumferential direction of the piezoelectric element and the part that protrudes toward the center of the terminal.

Because of this shape, when a voltage is applied to the piezoelectric element 16, distortion occurs in the piezoelectric element 16. Since the strain is regulated by the terminal 17, the rotational movement of both ends of the piezoelectric element 16 due to the strain is transmitted to the guide 9 and the push frame 14 connected to the both ends. Therefore, the roller shaft 8, which is designed to move integrally with the guide 9, is rotated. Note that when the rotational movement of the piezoelectric element 16 due to strain is transmitted to the guide 9, the guide 9 and the roller shaft 8 are fixed and move together, but the push frame 14 and the roller shaft extension are not fixed. Therefore, it hardly contributes to rotating the roller shaft 8.

As mentioned above, the rotational motion of the end of the piezoelectric element 16 is conducted through the contact point between the ceramic forming the piezoelectric element 16 and the guide 9, but the shape of the contacting ceramic affects the conduction efficiency. Left and right. However, it is difficult to process the piezoelectric element 16 into the required shape (FIG. 4A), so as shown in FIG. It is sufficient to attach a contact 21 such as the like. It goes without saying that the contacts may be partially provided at a plurality of locations as long as they are provided over at least the range of contact with the guide 9 at the end of the piezoelectric element 16.

By doing so, the contact angle with the guide 9 becomes constant, and the electric efficiency of rotation can be improved.

As shown in FIG. 2B, the terminal 17 is designed so that it can cope with the vertical movement of the extension shaft 8a of the roller shaft 8 passing through the axis of the piezoelectric element 16 as the piezoelectric element 16 is driven. A horizontal elongated hole 19 is formed at the fulcrum position so that it is held by a part of the frame.

Further, as shown in FIG. 2 ASC, the frame 18 that holds the ultrasonic motor 6, roller shaft 8, etc.
The roller shaft 8 and the like are restricted from moving in the axial direction, and are also restricted from moving in a direction perpendicular to the axial direction. On the other hand, when loading and unloading the card 1, the rubber roller 3
The ultrasonic motor 6, roller shaft 8, etc. can be moved up and down through the holder.

FIG. 5 shows an embodiment in which the present invention is applied to a head drive mechanism for recording and reproducing data on a recording medium in an optical disk device or the like.

The same reference numerals are given to parts corresponding to those in the above embodiment. The head 24 is movable via a guide 25 in the direction in which the guide 25 extends. A lead screw 22 is coaxially connected to the ultrasonic motor 6 in place of the roller shaft 8, and is configured to rotate in response to the rotational movement of the ultrasonic motor 6.

On the other hand, a biasing spring 23 is fixed to the head 24 so as to press against the lead screw 23.

Therefore, the rotation of the lead screw 23 causes the spring 2 to
3, the head 24 can move along the guide 25.

FIG. 6A is a sectional view showing the connection state between the ultrasonic motor 6 and the lead screw 22, and FIG. The same is true.

[Effects of the Invention] As described above, according to the present invention, since the rotating body is rotated using the ultrasonic motor as the power source, there is no need to transmit power through gears or adjust the rotational speed, so the rotation speed is low. The high output makes it possible to increase the speed of the rotating body, as well as simplify the configuration and reduce current consumption.

In addition, since ultrasonic motors have low inertia, even when rotating a rotating body at high speed, there is less loss in the time it takes to stop the card, and the distance it takes to stop the card can be shortened compared to conventional cored motors. It can be improved to about 175. Therefore, efficient card movement can be realized.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a card drive device showing one embodiment of the present invention. FIGS. 2A, B, and C are sectional views showing the state of connection between the ultrasonic motor and the rotating part, a front view of the terminals, and the frame. 3 is a schematic perspective view of the ultrasonic motor, FIGS. 4A and 4B are explanatory diagrams showing the bonding state of the piezoelectric element and the guide, and FIG. 5 is an application of the present invention to a head drive unit. FIGS. 6A and 6B are a sectional view showing a connected body of an ultrasonic motor and a rotating part, and a front view of a terminal location. 1...Card 3...Rubber roller 4...Roller 6...Ultrasonic motor 8...Roller shaft 16...Piezoelectric element 17...Terminal Fig. 3 Fig. 4

Claims (1)

[Scope of Claims] 1. A card drive device that conveys a card via a roller that rotates while abutting a side portion of the card in the conveying direction and a rotating body that rotates while abutting a flat surface of the card, comprising: A card drive device characterized in that an ultrasonic motor having circular vibrations at both ends of a cylindrical body is coaxially connected to transmit power to a rotating shaft of a rotating body.