JPS6364675A - Magnetic card recording and reproducing device - Google Patents

Abstract

PURPOSE:To simplify a circuit and to cut down its cost by constituting a synchronizing signal in a magnetic card recording and reproducing device only of logic circuit elements. CONSTITUTION:One rotary encoder 6 outputs two types of synchronizing signals (1) and (3) whose duty cycles are 50% or less and whose phases are shifted by 180 deg.. It gives the signal (1) as an information read synchronizing signal to a microcomputer 3, and reads an information (2). The rotary encoder 6 inputs the signal (1) together with the synchronizing signal (3) to a NAND circuit 71 to generate an information pulse (4), inverts 73 the synchronizing signal (1) to generate a counting pulse (5), mixes them in a NAND circuit 72 to attain a signal (6), and outputs said signal (6) to a magnetic head 5 through an FF4. Thanks to this constitution, the synchronizing circuit 7 is simplified and its cost is reduced.

Description

[Detailed Description of the Invention] [Summary] A method of forming pulses for writing clock information and data information from one type of synchronization signal requires a waveform shaping circuit including resistors and capacitors, making the circuit complicated.

Therefore, by forming each pulse from a dedicated synchronization signal and eliminating the waveform shaping circuit, the synchronization circuit can be simplified.
This is aimed at lowering the price.

[Industrial application field]

The present invention relates to a device for inputting information to an information processing device using a magnetic card, and more particularly to a magnetic card recording/reproducing device having a function of writing information.

Magnetic cards are widely used as a means of identifying individuals in financial institutions, transportation facilities, etc., and their use has recently been expanded to include use in medical institutions, offices, factories, etc.

As the uses of such magnetic cards expand, there is a desire for low-cost magnetic card recording and reproducing devices that write information on and read information from magnetic cards.

[Conventional technology]

FIG. 3 is a diagram showing information recorded on a magnetic card, FIG. 4 is a circuit diagram showing a conventional magnetic card recording/reproducing device, and FIG. 5 is a time chart showing the operation.

Clock information C and data information d are recorded on the magnetic card as shown in FIG. 3, and the clock information C is recorded at constant intervals (0.12 mm intervals) from the start point to the end point of the information recording area. Further, data information d is recorded in the middle of clock information C, and it is arranged that several bits from the starting point are always left empty.

In order to record clock information C and data information d on the magnetic card at specified intervals, the magnetic card recording/reproducing device includes a rotary encoder that outputs a pulse signal in synchronization with the running speed of the magnetic card, and a rotary encoder that outputs a pulse signal in synchronization with the running speed of the magnetic card. It includes a synchronous circuit that outputs a pulse for writing clock information C and a pulse for writing data information d.

In FIG. 4, the synchronous circuit 1 includes a data pulse forming section 11 and a clock pulse mixing section 15, and the pulse signal shown in FIG.
A synchronizing signal (hereinafter referred to as a synchronizing signal) is input to the data pulse forming section 11 and the clock pulse mixing section 15. The synchronizing signal output from the rotary encoder 2 is also input to the microcomputer 3, and the data signal shown in FIG.

The data pulse forming section 11 is connected to the waveform shaping circuit 12 and the NAND
The waveform shaping circuit 12 is composed of logic circuit elements, resistors, capacitors, etc.

The data signal shown in FIG. 5 (■) is input to one input terminal of the NAND circuit 13, and the integral waveform of the synchronization signal shown in FIG. The data pulse shown in is output.

Further, the clock pulse mixing section 15 is connected to the waveform shaping circuit 16 and N
It consists of an AND circuit 17 and a waveform shaping circuit 16.
consists of logic circuit elements, resistors, capacitors, etc. The data pulse shown in FIG. 5 (■) is input to one input terminal of the NAND circuit 17, and the integral waveform of the synchronization signal shown in FIG. 5 (■) is input to the other input terminal. The signal mixed with clock pulses is NAND
The signal is output from the circuit 17 to the magnetic head 5 via the flip-flop circuit 4.

[Problem that the invention seeks to solve]

However, the method of forming pulses for writing clock information and data information from a single type of synchronization signal output from a rotary encoder requires a waveform shaping circuit that includes resistors and capacitors, making the synchronization circuit complex and expensive. There was a problem.

[Means for solving problems]

FIG. 1 is a circuit diagram showing a magnetic card recording/returning device according to the present invention. The same objects are represented by the same symbols throughout the figures.

The above problem lies in the fact that the rotary encoder 6' outputs two types of synchronization signals, each with a duty cycle of less than 50% and whose phase is shifted by 180 degrees, and the synchronization circuit 7, which is composed only of logic circuit elements. By mixing the data signal output from the microcomputer 3 and two types of synchronization signals output from the rotary encoder 6 in the synchronization circuit 7, a data pulse for writing data information and a data pulse for writing clock information are generated. This problem is solved by the magnetic card recording and reproducing apparatus according to the present invention, which forms a clock pulse and inputs it to the magnetic head 5 via the flip-flop circuit 4.

[Function] In the magnetic card recording and reproducing apparatus according to the present invention shown in FIG. 1, the synchronization circuit is composed of only logic circuit elements, and the circuit can be simplified and the cost can be reduced.

〔Example〕

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 2 is a time chart showing the operation of the apparatus according to the present invention.

In FIG. 1, the magnetic card recording/reproducing device according to the present invention outputs two types of synchronizing signals, each having a duty cycle of less than 50% and having a phase shift of 180 degrees.
The synchronous circuit 7 includes a solid rotary encoder 6, a NAND circuit 71 for forming data pulses, a NAND circuit 72 for mixing clock pulses, and a NOT circuit 73 for signal inversion.

The first synchronization signal shown in FIG. 2 (■) output from the rotary encoder 6 is input to the microcomputer 3 as a synchronization signal for reading data, and the data signal shown in FIG. Output.

The second synchronization signal shown in FIG. 2 (■) output from the rotary encoder 6 and the data signal shown in FIG. has been input and N
The data pulse shown in FIG. 2 is outputted from the AND circuit 71.

Further, the first synchronization signal output from the rotary encoder 6 is inverted by the NOT circuit 73 to form the clock pulse shown in FIG. 72
is input.

In the NAND circuit 72, the data pulse shown in FIG. 2 (■) and the clock pulse shown in FIG. 2 (■) are mixed, and the data pulse shown in FIG.
A signal that is a mixture of data pulses and clock pulses shown in is outputted to the magnetic head 5 via the flip-flop circuit 4.

As described above, the magnetic card recording/reproducing device according to the present invention can configure a synchronous circuit using only logic circuit elements, and can realize simplification and cost reduction of the circuit.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to provide a magnetic card recording/reproducing device at a lower cost.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram showing a magnetic card recording/reproducing device according to the present invention, FIG. 2 is a time chart showing the operation of the device according to the present invention, FIG. 3 is a diagram showing information recorded on a magnetic card, and FIG. FIG. 4 is a circuit diagram showing a conventional magnetic card recording/reproducing device, and FIG. 5 is a time chart showing its operation. In the figure, 3 represents a microcomputer, 4 a flip-flop circuit, 5 a magnetic head, 6 a rotary encoder, 7 a synchronous circuit, 71 and 72 a NAND circuit, and 73 a NOT circuit. Early 4 Figure ■ Operation 4-way tie Z/Head $5 Figure

Claims (1)

[Claims] A synchronization system consisting only of one rotary encoder (6) that outputs two types of synchronization signals, each with a duty cycle of less than 50% and a phase shift of 180 degrees, and a logic circuit element. By having a circuit (7) and mixing the data signal output from the microcomputer (3) and two types of synchronization signals output from the rotary encoder (6) in the synchronization circuit (7), A data pulse for writing data information and a clock pulse for writing clock information are formed and sent to the magnetic head (5) via a flip-flop circuit (4).
A magnetic card recording/reproducing device characterized by inputting data to a magnetic card.