JPS6016022B2 - Magnetic card reader - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic card reader (hereinafter referred to as MCR), and an object thereof is to provide an MCR that prevents reading errors when picking up a card.

Conventional MCRs do not have a function to check for processing errors, and the clock signal and data recorded on the card are only processed by the head while the card is moving in the ejection direction and sent to the next stage. Its own demagnetizing effect, or
Decreased head output due to dirt, oil, etc. on the card, or demagnetization due to the environment (holding the card in a magnetic field).
There is a drawback that reading errors occur due to randomly occurring electrical noise and data being erased due to scratches on the card surface.

The present invention solves the above-mentioned drawbacks, and will be described with reference to a block diagram of the embodiment shown in FIG. , 1 is a signal input terminal that informs the arrangement in the direction of card ejection, 2 is a signal input terminal that informs the arrangement in the direction of card insertion, 3 is the data input terminal, and 4 is the input of the clock signal. Terminals 5 are a control circuit, 6 is a data storage circuit, 7 is a coincidence circuit, 8 is a data output terminal, 9 is an error signal output terminal, and 10 is a clock signal output terminal.

The operation is such that when a card is inserted into the MCR and moved in the insertion direction to perform a discussion, a signal for conducting a discussion in the insertion direction is input to input terminal 2, data is input to input terminal 3, and a clock signal is input to input terminal 4. Each signal is processed by the control circuit 5, and the data is input to the data storage circuit 6 and stored.

When the card is moved in the ejection direction and read, a signal for reading in the ejection direction is sent to input terminal 1, and input terminal 3
Data is input to input terminal 4, and a clock signal is input to input terminal 4, each signal is processed by control circuit 5, and data is input to coincidence circuit 7. Therefore, the data discussed in the insertion direction and the data discussed in the ejection direction are compared, and if they match, the data is sent from the output terminal 8 to the next stage. Further, if they do not match, an error signal is detected from the output terminal 9. The detailed content of the block diagram shown in FIG. 1 is shown in FIG. 2 and will be explained. When the card is inserted into the MCR, the signal from the input terminal 2 flips. While setting flop 11, the output of OR gate 12 causes 4-bit counter 13, flip-flops 14, 20,
Clear up/down counters 16, 17, and 18.

The data stored on the card and the clock signal are applied to input terminals 3, 4, and the data is input through a NAND gate 15 to a 4-bit counter 13 for counting.

The output of the 4-bit counter 13 sets a flip-flop 14. The output of the flip-flop 14 opens the up count input of the input gates of the up/down counter 6, and data is input to the static RAM 19 and stored. The addresses of the static RAM 19 are determined by the outputs of the up/down counters 16, 17, and 18, and the data stored on the card are ordered and stored.

In order to process the input read signal in the card ejection direction, a signal is input to the input terminal 1, which resets the flip-flop 11, and a signal from the OR gate 12 causes the 4-bit counter 13, flip-flops 14, 20,
Clear up/down counters 16, 17, and 18.

At this time, the up/down counters 16, 17, 18
Insert the data discussed during the insertion direction. . gram.
Data and clock signals are input to terminals 3 and 4, and the input data is read sequentially from the END bit.

The data is then input to a 4-bit counter through a NAND gate 13 and counted, and the output of the 4-bit counter 13 sets a flip-flop 14. The output of the flip-flop 14 opens the down count input of the input gates of the up/down counter 6, and the count is counted down from preprogrammed data. up/down counter 16
, 17, 18 to specify the address of the static ram 19, and input data and the static ram 1.
The data stored in 9 is input to an EX-OR circuit 21 to detect whether or not they match.

If they match, data is output from terminal 8, and if they do not match (if an error is detected), flip-flop 20 is set by the output signal of EX-OR circuit 21, and an error signal is output from terminal 9. be done. In addition, 2
2 and 23 are data read from the card.

This is a separation circuit that separates the pull signal into the insertion direction and the ejection direction. As mentioned above, the MCR according to the present invention discusses data as the card moves in the insertion direction and the ejection direction, and compares each data to detect errors, so there is no data discussion error. This has extremely significant practical effects, such as greatly improving the reliability of data.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a circuit diagram showing the embodiment shown in FIG. 1 in detail. 1, 2, 3, 4...Input terminal, 5...Control circuit, 6
...Memory circuit, 71... Match circuit, 8, 9,
10... Output terminal, 11, 14, 20...
Flip Flop, 12...Orgate, 13...4
Bit/power counter, 16, 17, 18...Up/down counter, 19...Statistic ram, 21...
・・EX-OR circuit, 22, 23...separation circuit. Figure 1 Figure 2

Claims (1)

[Claims] 1 A control circuit that controls the data read when the card moves in the insertion direction and an ejection direction, a memory circuit that stores the data read when the card moves in the insertion direction, and a control circuit that controls the data read when the card moves in the insertion direction. 1. A magnetic card reader comprising a matching circuit for comparing data, and when the respective data match, the matching circuit outputs the data, and outputs an error signal when the data does not match.