JPH0341333Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention is a magnetic card reader/writer (hereinafter simply referred to as card R/W) that writes and reads signals on a magnetic card. This invention relates to a so-called moving head type magnetic card R/W in which the magnetic head is moved.

[Conventional technology]

As a magnetic card R/W, a so-called card moving type, in which a magnetic head is fixed and a magnetic card is slid over it at high speed, has been commonly used. However, this type of card R/W requires a depth that is at least twice the length of the card, and also requires multiple transport rollers to transport the card, which has the disadvantage of increasing the size of the device. be.

[Problem that the invention attempts to solve]

Recently, there has been a strong demand for miniaturization of digital devices, and moving head type magnetic card R/W, which can have a depth that is almost the same as the length of the card, has been used. However, in the conventional moving head type card R/W, in order to move the carriage 2 on which the magnetic head 1 is mounted as shown in FIG. The disadvantage was that the structure was complex because it was converted into motion, and it was not possible to make it as compact as expected. In addition, in the case of a moving head type card R/W, it is difficult to maintain the relative speed between the card and the head constant over the entire surface of the card. I am using it.

However, due to belt elongation, pulley play, etc., a slight deviation occurs between the output of the rotary encoder 7 and the actual head position, which is an obstacle to high-density recording.

[Purpose of invention]

The purpose of this invention is to use a moving coil type linear motor as a thrust source for moving the magnetic head, to mount the magnetic head on a carriage that is integrated with the moving coil, and to use a magnetic linear encoder as the sliding axis of the carriage. . The present invention provides a moving head type card R/W having a simple structure and high detection accuracy of the magnetic head position.

[Structure of the idea]

The present invention uses a moving coil type linear motor as a thrust source for moving the magnetic head in a moving head type magnetic card R/W, and as a sliding shaft of a carriage integrated with the moving coil, it can be magnetized in the length direction. A magnetic material with a high coercive force is magnetized so that N-S is reversed every few tens to hundreds of microns, and this magnetized state is read out with a detection head.The magnetic head is attached to the carriage. This magnetic card reader/writer is characterized by being equipped with a detection head for a linear encoder.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a schematic diagram of the magnetic head sliding mechanism of the magnetic card R/W of the present invention. In the figure, 1 is a magnetic head used for writing and reading signals, 2 is a carriage integrated with the moving coil of a moving coil type linear motor 3', and the sliding shaft 5' can be magnetized in the length direction. It is made of a magnetic material having a high coercive force, and is magnetized so that N-S is reversed over a length of several tens to several hundred microns. This magnetized state is detected by a detection head 7', forming a linear encoder. In the card R/W of the present invention, with the magnetic card 6 fixed, the magnetic head moves left and right to write and read signals. Further, as described above, the timing pulses necessary for writing are provided by the output from the detection head 7' of the linear encoder.

[Effect of idea]

In the card R/W according to the present invention, since a moving coil type linear motor is used as a moving thrust source for the magnetic head, the magnetic head follows the sliding shaft 5' together with the carriage integrated with the moving coil. The mechanism is simpler than the conventional method shown in Figure 2, which uses a belt to convert rotational motion into linear motion, making it possible to reduce size and cost. . In addition, in the card R/W of the present invention, the write timing pulse is obtained from the output of the linear encoder detection head integrated with the magnetic head, so the detection accuracy of the head position is increased and high-density recording is possible. has advantages.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of the magnetic head sliding mechanism of the card R/W of the present invention. FIG. 2 is a schematic diagram of a conventional head moving type magnetic card R/W head sliding mechanism. In the figure, 1... Magnetic head, 2... Carriage, 3... Rotary motor, 3'... Linear motor, 4... Belt, 5... Sliding shaft, 5'... Linear encoder that also serves as sliding shaft. , 6...magnetic card, 7
...Rotary encoder, 7'...Linear encoder detection head.

Claims (1)

[Scope of utility model registration request] A moving head type magnetic card reader/writer in which a magnetic card is fixed and a moving coil type linear motor is used as a moving thrust source for the magnetic head to write and read signals to the magnetic card. The sliding shaft of the carriage is made of a magnetic material with a high coercive force that can be magnetized in the length direction, and is magnetized so that N-S is reversed over several tens of microns to several hundred microns, and this magnetized state is detected by a detection head. A magnetic card reader/writer comprising a linear encoder configured to read data, and a magnetic head for a magnetic card and a detection head for a linear scale mounted on the carriage.