JPH0341332Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention is a magnetic card reader/writer (hereinafter simply referred to as card R/W) that writes and reads signals to and from a magnetic card. This invention relates to a head moving type card R/W that moves a magnetic head.

[Conventional technology]

Conventionally, many card R/Ws have been used in which a magnetic head is fixed and a magnetic card is slid on the head at high speed. However, in this card R/W, at least 2 of the card length dimension
Since the depth dimension is twice as large and a plurality of conveyance rollers are required for conveying the cards, the device becomes large in size.

Recently, there has been a strong demand for miniaturization of digital devices, and a moving head type card R/W has been used, which can have a depth that is almost the same as the length of the card. However, in the conventional moving head type R/W, as shown in FIG. The rotation of the belt 4 and the belt 4' are used to convert the rotation into linear motion, resulting in a complicated structure, which has the disadvantage that it cannot be made as compact as expected. In addition, in the case of a moving head type card R/W, since the moving direction of the magnetic head is reversed at both ends of the sliding shaft 5, it is necessary to widen the fixed range of the head moving speed within the head moving range. become. Conventionally, moving head type card R/W
In order to obtain a reversal signal, for example, a photo sensor is placed at the end, and a photo sensor sensing device is placed on the movable body to reverse the moving direction of the head.

[Problem that the invention attempts to solve]

In this case, the overshoot at the end is large and the constant speed range is narrow, which is an obstacle to miniaturization of the moving head type card R/W. In addition, if a limit switch is placed at the end to obtain a reversal signal and a movable object collides with it, the shock and vibration will be large, and the limit switch will be sandwiched between both ends, which will impede size reduction. I was getting used to it. Furthermore, as a method to widen the constant speed range without causing collisions, it is possible to use a rotary encoder or the like to control the position and speed of the head when the moving direction is reversed using position and speed signals, but the circuit is complicated. It becomes expensive.

An object of the present invention is to provide a compact head moving type card R/W that uses a moving coil type linear motor as a moving thrust source for a magnetic head, has a wide constant speed range, has a simple structure and circuit, and is compact.

[Means for solving problems]

The present invention is a head moving type magnetic card reader/writer using a moving coil type linear motor as a moving thrust source for the magnetic head, and a stopper made of a soft elastic material is provided at both ends of the sliding shaft on which the movable body slides. , at least two conductors are arranged on the stopper, and conductive plastic is fixed to both ends of the movable body equipped with a magnetic head, and when the movable body collides with the stopper, the conductors are electrically short-circuited. The feature is that a detector is provided to detect this.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic diagram of the sliding mechanism of the magnetic head of the card R/W of the present invention. In Figure 1,
1 is a magnetic head used for reading and writing signals to the magnetic card 6; 2 is a magnetic head 1;
The carriage 5' is integrated with the moving coil of the moving coil type linear motor 3', and the carriage 5' is made of a magnetic material with a high coercive force that can be magnetized in the longitudinal direction. ,dozens~
It is a sliding shaft that is magnetized so that the north and south poles are reversed over a length of several hundred micrometers. This magnetized state is detected by a linear encoder detection head 10 attached to the carriage 2, and constant speed control is performed based on the detected output signal. In addition, this card R/W has a stopper 7 made of a soft elastic material at both ends of the sliding shaft 5' to obtain a signal for reversing the moving direction of the magnetic head 1, and two conductors 8 are placed on the stopper 7. It is placed. Conductive plastics 9 are fixed to both ends of a carriage 2 on which a magnetic head 1 is mounted.

In the card R/W of the present invention, when the carriage 2 carrying the magnetic head 1 slides on the sliding shaft 5' and collides with the stoppers 7 provided at both ends of the sliding shaft 5', the carriage 2 is moved onto the stopper 7. Two conductors 8 provided
The conductive plastic 9 fixed on the carriage 2 comes into contact with the conductive plastic 9 . The two conductors 8 are connected through a lead wire and a power source (not shown) at the other end, and the two conductors 8 provided on the stopper 7
When the conductive plastic 9 fixed on the carriage 2 comes into contact with the conductive plastic 9, conduction is established through the conductive plastic 9. A signal detector (not shown) or the like is provided in the middle of the above-mentioned lead wire, and a signal for reversing the moving direction of the magnetic head 1 can be obtained by this detector.

[Effect of idea]

According to the present invention, in card R/W, a moving coil type linear motor is used as a moving thrust source for the magnetic head, so the magnetic head moves smoothly in a straight line along the sliding axis together with the carriage integrated with the moving coil. Can exercise. Furthermore, the mechanism is simpler than the conventional method of converting rotational motion into linear motion using a belt, making it possible to reduce the size and cost.

In addition, in the card R/W of the present invention, the moving direction reversal signal of the magnetic head is obtained by the conductor being short-circuited by the conductive plastic when the movable body collides with the end, so it is thin and structured. In addition to being simpler and more compact, the use of soft elastic material and conductive plastic absorbs the shock and the repulsion force builds up quickly, which has the advantage of widening the constant speed range. is very large.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a magnetic head sliding mechanism of a card reader/writer according to an embodiment of the present invention, and FIG. 2 is a schematic diagram of a magnetic head sliding mechanism of a conventional moving head type magnetic card reader/writer. 1: Magnetic head, 2: Carriage, 3: Rotary motor, 3': Linear motor, 4, 4': Belt,
5, 5': sliding shaft, 6: magnetic card, 7: stopper, 8: conductor, 9: conductive plastic, 1
0: Linear encoder detection head.

Claims (1)

[Scope of utility model registration request] This is a moving head magnetic card reader/writer that uses a moving coil type linear motor as a moving thrust source for the magnetic head.A stopper made of a soft elastic material is provided at both ends of the sliding shaft on which the movable body slides. at least two conductors are placed in the
Conductive plastic is fixed to both ends of the movable body on which a magnetic head is mounted, and a detector is provided for detecting that the conductor is electrically shorted when the movable body collides with the stopper. A magnetic card reader/writer.