JPH0452785A - Card-like device and card-like device system - Google Patents

Abstract

PURPOSE:To transmit and receive data by providing a reception means receiving data in correspondence with a light-receiving means, a color development means and a control means controlling the color development means in correspondence with transmission data. CONSTITUTION:When data is transmitted from a host 1 to a card 9, the control part 3 transmits data by outputting a signal string to LED 5 since a signal outputted to LED 5 is inputted to a photo-transistor 17 as it is. When data is transmitted from the card 9 to the host 1, the control part 11 detects that LED 5 is turned on when the control part 3 turns it on. When the signal is inputted to liquid crystal 15, the inverted signal is outputted to the photo-transistor 17 in accordance with the signal and data is transmitted. Thus, data is transmitted and received in a semi double system and data is precisely communicated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a card-like device and a card-like device system that communicate with a host device using light.

[Conventional technology]

Conventionally, this type of device has an LED (light emitting diode) serving as an optical transmitter, and has been used to transmit data.

[Problems to be Solved by the Invention] However, in the conventional example described above, only limited information could be transmitted.

[Means to solve the problem]

In contrast, the present invention includes a light receiving means, a receiving means for receiving data according to the output of the light receiving means, a coloring means,
By providing a control means for controlling the coloring means according to the transmitted data, it is possible to transmit and receive data.

〔Example〕

In this embodiment, data is transmitted and received between the card 9 and the host 1 using light. The host 1 has a light emitting section LED5 serving as a data transmitting section and a light receiving section phototransistor 7 serving as a data receiving section. On the other hand, the host 1 divides the light emitted from the card 9 by a half mirror 13, sends one part to the light receiving part phototransistor 17 which becomes its own data receiving part, and transmits the remaining part to become the data transmitting part. Light enters the light receiving section phototransistor 7 of the host 1 through the light control section liquid crystal 15 to perform communication.

FIG. 1 shows the configuration of this embodiment, where 1 is a host having an optical transmitting and receiving section using an LED and a phototransistor, 3 is a control section that controls the host 1, 5 is an LED serving as a light transmitting section,
7 is a phototransistor which becomes a light receiving section, 9 is a liquid crystal 15
11 is a control unit for controlling the card 9; 13 is a half mirror; 115 is a transmissive liquid crystal; and 17 is a phototransistor.

In the above configuration, the host 1 and the card 9 are not optically coupled in the initial state. When the card 9 is inserted into the U-shaped recess of the host 1 and optically coupled, the card 9 will then shift to a data transmission/reception mode. The above operation will be explained using the flowcharts in FIGS. 2 and 3 and the timing chart in FIG. 4.

First, the control unit 3 of the host 1 assigns 2 to N as an initial setting (si). In the standby state, a signal as shown in FIG. 4 is applied to the LED 5 to cause the LED 5 to emit a predetermined code (S2). Here, it is assumed that the LED 5 emits light when the applied voltage is high. In this example, the "predetermined code" is represented as a signal string of 1001. At this time, the control unit 3 photoelectrically converts the light received by the phototransistor 7 and determines whether the output is the same code as the code output to the LED 5 (S3). If the codes are the same, it can be determined that the card 9 is not installed between the LED 5 and the phototransistor 7.

On the other hand, in the standby state, the control unit 11 of the card 9 outputs a high level to the liquid crystal 15 (521), and keeps the liquid crystal 15 in a light-shielding state (.Therefore, the card 9 cannot be installed in a predetermined position of the host 1. As a result, the optical path from the LED 5 to the phototransistor 7 is blocked by the liquid crystal 15. Therefore, the code 1001 is no longer output to the phototransistor 7, and the control unit 3 detects that the card 9 is inserted.At this time, An appropriate value is set for N, and it is confirmed that the code 1001 is not output continuously for that number of stitches (S4 and S5).Also, at that time,
A part of the light output emitted from the LED 5 is inputted to the phototransistor 17 by the half mirror 13, and a signal string 1001 is inputted to the control section 11. By detecting this code, the control unit 11 knows that the card 9 has been inserted (S22).

Next, the control unit 3 turns the LED 5 into a continuous lighting state (S6).
, READY sent from card 9
Wait for the code (1010 in the example in Figure 4) for a certain period of time (5
7-5 lO). Then, if a READY code is received within the certain period of time, the communication mode is entered (S9). At this time, it visually and audibly indicates that it has been set correctly. Also, if the READY code does not arrive within a certain period of time, it is assumed that there is a problem such as the card 9 not being installed correctly or a foreign object getting into the optical path.
After a certain period of time, an alarm, guidance, etc. is displayed visually or audibly (Sll). For example, an error sound such as "beep beep" or guidance such as "please try again".

In this way, the host 1 and the card 9 detect that they are correctly attached by detecting a predetermined code from each other, and therefore a detection element for detecting attachment is not required, leading to cost reduction and miniaturization of the device. became possible. Furthermore, since the detection is performed using an actual data transmitting/receiving section, and the detection is performed using a predetermined code, the reliability of detection is improved.

Further, when the card is set correctly, the name of the owner of the card 9 received from the card 9 after that is displayed. Therefore, you can see at a glance whose cards are set.

Further, the card 9 that has received the code 1001 from the host 1 first detects whether the LED 5 is continuously lit for a certain period of time in order to output the code 1010 to the host (823-525). When the light is turned on continuously, the light from the LED 5 to the phototransistor 7 is turned on and off by turning on and off the drive of the liquid crystal 15.
It transmits the code 010 to the host 1 (S26) and shifts to communication mode (S27). At this time, it visually and audibly indicates that the settings have been made correctly. On the other hand, if the LED 5 does not turn on continuously for a certain period of time, it is considered that the host 1 could not detect that the card 9 was inserted. Accordingly, a visual or audible alarm or guidance is displayed (528).

In the actual transmission/reception operation, when transmitting data from the host 1 to the card 9, the signal output to the LED 5 is directly input to the phototransistor 17, so the controller 3
transmits data by outputting a signal string to the LED 5. Furthermore, in the case of transmission from the card 9 to the host 1, the control section 3 first turns on the LED 5. When the control unit 11 detects this and outputs a signal to the liquid crystal 15,
Accordingly, the inverted signal is output to the phototransistor, and data is transmitted.

Through the above-described operation, data is transmitted and received in a half-duplex manner, but in this embodiment, it is possible to stop the transmitter from the side of the receiving device that is receiving data. first,
Consider the case where host 1 is the receiving side and card 9 is the transmitting side. FIG. 5 shows a flowchart of the control section 3, FIG. 6 a flowchart of the control section 11, and FIG. 7 a timing chart. The host lights LED 5 during reception (S31.532).

The light output emitted by LED 5 is always transmitted to phototransistor 1.
If the control unit 3 wants to stop the reception (S33, 534), it can output a stop code to the LED 5 (S35). For example, when the LED 5 is turned off, the phototransistor 17 is turned off. When the control unit 11 detects this, as shown in FIG. 7, even if data is being transmitted (841-543), it immediately stops transmitting (S44).

Next, consider the case where card 9 is on the receiving side and host l is on the sending side. FIG. 8 shows a flowchart of the control section 3, FIG. 9 shows a flowchart of the control section 11, and FIG. 10 shows a timing chart. The control unit 11 outputs a high level to the liquid crystal 15 during reception (S61.562) so that the light output from the LED 5 is not received by the phototransistor 7. When the liquid crystal I5 is turned off when stopping transmission (863-565), the light output from the LED 5 is received by the phototransistor 7.

When the phototransistor 9 turns on during transmission (S51-
S53), the control unit 3 detects this and stops the transmission (S53).
54). Criteria for stopping the transmission include, for example, a reception abnormality or an interruption caused by an operator's key operation.

Further, it is also possible to perform full-duplex communication using the configuration of this embodiment. This will be explained using the timing chart of FIG. 11 as an example. Now, the control unit 3 of the host 1 is set to 101 on the LED 5.
Assume that a code of 0 is being output. This code signal is L
Through the ED5 and the phototransistor 17, it is similarly output as 1010 to the phototransistor 17 and is sent to the control section 11.
received at At that time, as soon as the control unit 11 detects that the received data becomes rlJ, it displays 00
Outputs 10 codes. At that time, if the length of this 4-bit signal string is set shorter than the 1-bit period of the LED 5, the phototransistor 7 will have 11
A code signal of 01 is output, and the control section 3 can receive this signal. That is, the control section 11,
It detects that the ED 5 is in a lit state, turns on and off the liquid crystal 15, and transmits data. Further, in this case, full-duplex communication cannot be performed unless the LED 5 is turned on, so the code system from the host 1 to the card 9 should always start with, for example, rlJ.

Next, another example of the full-duplex communication system will be explained using FIG. 12. In this case, contrary to the previous example, card 9
4-bit data is output to the LED 5 during the 1-bit period of 0 of the output code transmitted by the LCD 15, and the code output to the liquid crystal 15 is set to a code system that always starts with 0, for example.

In addition, the above-mentioned codes from host 1 to card 9 and from card 9 to host 1 must be programmed.

Although we assumed that the code starts with 0, it does not necessarily have to start with 1.0, but there should be at least one digit in the code.
．． This is also possible using a code that includes O.

As explained above, in a device that transmits and receives data using light, it is no longer necessary for each device to have a light emitting section, making it possible to reduce costs and downsize the device. Furthermore, power consumption is reduced and battery life can be extended.

[Other Examples]

In the embodiment of FIG. 1, the LED 5 is replaced by an E, L (electroluminescent) lamp, plasma, the phototransistor 7.17 is replaced by a photodiode, or
It may be replaced with an element having a similar function, such as an element whose resistance value changes depending on light.

In addition, if the light is reflected once by the mirror 19, the 131st
The same thing can be done with a structure as shown by 11J.

Alternatively, the host 1 may be provided with a plurality of LEDs, and the LED for transmitting data to the card 9 and the LED for illuminating the liquid crystal I5 of the card 9 may be separated. In this case, the half mirror 13 is not necessary.

Further, depending on the case, the card 9 may be provided with an LED. Then, the LED of the card 9 may be turned on and off according to the transmitted data.

〔Effect of the invention〕

According to the present invention, detailed data communication is possible based on the light receiving means and the coloring means.

Further, according to the present invention, by transmitting a communication stop command from the light emitting means or the light transmitting means while data is being received based on the light receiving means, it is possible to immediately command the communication to be stopped.

[Brief explanation of drawings]

FIG. 1 is a block diagram of the embodiment. FIG. 2 is a flowchart of card set detection by host 1 in the embodiment. FIG. 3 is a flowchart of card set detection by card 9 in the embodiment. FIG. 4 is a card set detection flowchart of card 9 in the embodiment. Timing diagram of set detection; Figure 5 is a flowchart for suspending reception by host I in the embodiment; Figure 6 is a flowchart for suspending reception by card 9 in the embodiment; Figure 7 is a request to suspend transmission to card 9 in the embodiment. FIG. 8 is a flowchart for canceling transmission by host 1 in the embodiment, FIG. 9 is a flowchart for canceling transmission by card 9 in the embodiment, and FIG. 1O is a timing chart for requesting host 1 to cancel transmission in the embodiment. 11 and 12 are timing diagrams of full-duplex communication in this embodiment, and FIG. 13 is a block diagram of another embodiment. 1 is a host, 3 is a control unit, 5 is an LED, 7 is a phototransistor, 9 is a card, 11 is a control unit, 13 is a half mirror, 115 is a liquid crystal, and 17 is a phototransistor. 1st block diagram of the first issue of the first issue 3rd figure

Claims (6)

[Claims] (1) A card shape characterized by having a light receiving means, a receiving means for receiving data according to the output of the light receiving means, a coloring means, and a control means for controlling the coloring means according to the transmitted data. Device. (2) The card-like device according to claim 1, further comprising a half mirror, the light receiving means is irradiated with reflected light from the half mirror, and the coloring means is irradiated with reflected light from the half mirror. A card-like device characterized in that it is irradiated with transmitted light. (3) a first light emitting means, a first light receiving means provided opposite to the first light emitting means, and a first light receiving means provided opposite to the first light emitting means;
a host device having a communication means for causing the light emitting means to emit light and further receiving data in accordance with the light reception output of the first light receiving means; a half mirror means; and a second host device to which the reflected light from the half mirror means is irradiated. a light receiving means, a selection means for transmitting or blocking the transmitted light from the half mirror means, receiving data according to the light reception output of the second light receiving means, and further transmitting or blocking the transmission of the light from the selection means according to the transmitted data. a card-like device having a control means for controlling shutoff;
A card-like device system, wherein the second light-receiving means receives the light emitted from the first light-emitting means that is selectively transmitted by the selection means. (4) In the card-like device system according to claim 3, the control means controls the first light emitting means while the communication means blinks the first light emitting means in accordance with the transmitted data. By selectively transmitting the emitted light,
A card-like device system that performs full-duplex communication with the communication means described above. (5) a setting means for setting the card-like device;
It has a light receiving means for receiving light from the set card-like device, a light emitting means, and a control means for controlling the light emitting means according to transmitted data, and the control means receives data based on the light receiving means. A card-like device system, characterized in that a communication stop command is transmitted from the light emitting means as necessary during the process. (6) It has a light receiving means, a receiving means that receives data according to the output of the light receiving means, and a light transmitting means that transmits light according to the transmitted data, and the light transmitting means communicates as necessary. A card-like device characterized in that it transmits a stop command.