JPH09312613A - Electronic device with optical communication function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To communicate data without being affected by disturbance light by instructing a transmitting means to quit transmission when noise in light pulses generated by the transmission means is detected in transmission mode. SOLUTION: At transmitting processing a transmission-side electronic device 1 once detecting disturbance light being generated through a PD 22 for disturabance detection informs control software 26 of that by using a monostable multivibrator 24. The software 26 when receiving this information sends an instruction for quitting the transmitting processing to a control IC 23, which quits the transmitting processing halfway on receiving this instruction. A reception-side electronic device 1, on the other hand, once receiving a light pulse train of communication data by a PD 21 for communication counts a signal level in the absence of light by a counter 25, and when the count value exceeds a prescribed value, that is reported to the software 26, thereby indicating that the transmission-side device 1 has quit the transmission. Once then information is received, the software 26 generates message data on a request to resend and instructs the IC 23 to send it to the transmission-side device 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic device having an optical communication function for performing data communication with another electronic device by using a pulse train of light, and particularly to a data device which is not affected by ambient light. The present invention relates to an electronic device having an optical communication function that enables communication.

Recently, in order to realize cableless, data communication is performed between portable information processing devices by using optical pulse trains, or between portable information processing devices and desktop information processing devices. Then, it has come to adopt a configuration of performing data communication by using a pulse train of light. When adopting such a configuration, it is necessary to build a configuration that is not affected by ambient light.

[0003]

2. Description of the Related Art Conventionally, in order to enable data communication with another electronic device using a pulse train of light without being affected by ambient light, a specific wavelength in the infrared region is specified as the wavelength of light. The configuration using wavelength is adopted.

That is, the data communication is performed by using a pulse train of light in the infrared region, which does not occur in nature, so that the data communication is executed without being affected by the ambient light.

[0005]

However, even a light source that emits visible light, such as a fluorescent lamp, emits light in the infrared region to a small extent. Moreover, a light source that emits visible light, such as a fluorescent lamp, may generate pulse-shaped light noise similar to electrical noise depending on the lighting method.

According to the prior art, when data communication is performed with another electronic device by using a pulse train of light, disturbance light is mixed in to perform erroneous data communication. There was a problem.

The present invention has been made in view of the above circumstances, and is in the case of adopting a configuration for performing data communication with another electronic device by using a pulse train of light, and is affected by ambient light. It is an object of the present invention to provide an electronic device having a new optical communication function that enables data communication to be performed without any trouble.

[0008]

FIG. 1 shows the principle configuration of the present invention. In the figure, reference numeral 1 denotes an electronic device equipped with the present invention, which executes data communication with another electronic device 1 equipped with the present invention by using a pulse train of light.

The electronic device 1 of the present invention comprises a light emitting means 10 and
The transmitting means 11, the light receiving means 12, the receiving means 13, the second light receiving means 14, the first detecting means 15, the first instructing means 16, the second detecting means 17, and the second detecting means 15. And an instruction means 18.

The light emitting means 10 emits light prepared for data communication. The transmission unit 11 blinks the light emitting unit 10 according to the transmission data to generate an optical pulse and transmits the optical pulse to another electronic device 1. The light receiving means 12 receives light prepared for data communication. The receiving unit 13 obtains the transmission data of another electronic device 1 from the electric signal of the optical pulse detected by the light receiving unit 12.

The second light receiving means 14 is provided separately from the light receiving means 12 and detects ambient light. The light receiving means 12 is the second
The substituting process of the light receiving means 14 may be executed. First
The detection means 15 of 1 detects noise in the optical pulse generated by the transmission means 11 when in the transmission mode.
The first instruction unit 15 instructs the transmission unit 11 to stop transmission.

The second detecting means 17 detects an abnormality in the electric signal of the optical pulse detected by the light receiving means 12 when in the receiving mode. The second instruction means 18 is the transmission means 11
Is instructed to transmit the message data of the resend request.

The electronic device 1 of the present invention configured as described above
Then, the transmission means 11 causes the light emitting means 1 to output the data according to the transmission data.
When the light pulse is generated by blinking 0 and is being transmitted to the other electronic device 1, the first detection means 15 is
By transmitting the detection value of the light receiving unit 14 of the
The noise with respect to the optical pulse generated by is detected.

Upon receiving the noise detection of the first detecting means 15, the first instructing means 16 instructs the transmitting means 11 to stop the transmission. On the other hand, when the receiving unit 13 obtains the transmission data of the other electronic device 1 from the electric signal of the optical pulse detected by the light receiving unit 12, the second detecting unit 17 detects that there is no light detected by the light receiving unit 12. By counting the signal level of (1), the abnormality of the electric signal of the optical pulse detected by the light receiving means 12 is detected.

In response to the abnormality detection of the second detecting means 17, the second instructing means 18 generates message data of the resend request and instructs the transmitting means 11 to transmit the message data. To do.

In this way, the electronic device 1 of the present invention has a configuration in which data communication is performed with the counterpart electronic device 1 by using a pulse train of light, and when disturbance light is generated. When a configuration is adopted in which transmission is stopped and the electronic device 1 of the other party executes this transmission stop to detect an abnormality in the pulse of light transmitted from the electronic device 1 of the other party, the electronic device of the other party is detected. 1
Since it takes the configuration to issue a resend request to
Data communication can be performed without being affected by ambient light.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail according to embodiments. FIG. 2 illustrates a system configuration of a data processing system configured by using the electronic device 1 of the present invention.

This data processing system has a configuration in which two electronic devices 1 of the present invention are prepared and each electronic device 1 exchanges data with the other electronic device 1.

As shown in this figure, the electronic device 1 of the present invention used in such a data processing system includes a light emitting diode 20, a communication photodiode 21, a disturbance detection photodiode 22, and a serial port. Control I
It includes a C23, a monostable multivibrator 24, a counter 25, and control software 26.

The light emitting diode 20 is prepared for data communication and emits infrared rays of a specific wavelength in response to a current signal. The communication photodiode 21 is prepared for data communication and detects the infrared light emitted from the light emitting diode 20 of the other electronic device 1 and converts it into a current signal. The disturbance detection photodiode 22 is sensitive to the wavelength of visible light and the wavelength of infrared light emitted from the light emitting diode 20, detects the disturbance light that becomes the disturbance of data communication, and converts it into a current signal.

The serial port control IC 23 is composed of a half-duplex communication type in which the receiving process cannot be executed when the transmitting process is being executed, and the transmitting process cannot be executed when the receiving process is being executed. Data transmission is performed by controlling the light emission of the light emitting diode 20, and data reception is performed using the current signal output from the communication photodiode 21.

The monostable multivibrator 24 generates a single pulse when the disturbance detecting photodiode 22 detects disturbance light noise. The counter 25 counts the current pulse output from the communication photodiode 21.
The control software 26 is the serial port control IC 23.
Control.

When the serial port control IC 23 executes the transmission process, the light emitting diode 20, the disturbance detection photodiode 22 and the monostable multivibrator 24 operate, and when the reception process is executed, the communication photodiode 21 and the counter. 25 and 25 operate.

The electronic device 1 of the present invention thus configured
Then, when it becomes the transmitting side, the serial port control IC
23 generates an optical pulse by blinking the light emitting diode 20 according to the transmission data and transmits the optical pulse to the receiving side electronic device 1, and upon receiving the optical pulse, the serial port control IC 23 of the receiving side electronic device 1 Performs data reception using the current signal output from the communication photodiode 21.

In this way, when the ambient light is not generated, as shown in FIG. 3, the electronic device 1 on the transmitting side indicated by IRTX transmits the communication data of the optical pulse train starting with the start bit and ending with the stop bit. , IRRX on the receiving side performs processing so as to receive this communication data. Hereinafter, for convenience of explanation, the electronic device 1 on the receiving side receives the signal level “1” when there is no light, and the signal level “0” when there is light.
Shall be received.

At the time of this transmission processing, the electronic device 1 on the transmission side
When the disturbance detection photodiode 22 detects the occurrence of disturbance light, the monostable multivibrator 24 is used to generate a single-shot pulse and notify the control software 26 to generate the disturbance light. To notify.

Upon receiving this disturbance light generation notification, the control software 26 instructs the serial port control IC 23 to stop the transmission process, and in response to this instruction, the serial port control IC 23 stops the transmission process midway. I will do it.

In this way, when the electronic device 1 on the transmission side stops the transmission process, the electronic device 1 on the reception side continues to receive the signal level without light (signal level "1").

When the electronic device 1 on the receiving side receives the optical pulse train of the communication data by the communication photodiode 21, the counter 25 counts up the signal level without light, and the counted value is obtained. By notifying the control software 26 of the fact that the value becomes equal to or more than the specified value, the control software 26 is notified that the electronic device 1 on the transmission side has stopped transmission midway.

Upon receiving this transmission stop notification, the control software 26 resets the count value of the counter 25, generates message data of a resend request, and sends it to the serial port control IC 23 to send it to the electronic device on the transmission side. Instructing the device 1 to transmit, the serial port control IC 23 receives the instruction and transmits the message data of the resend request to the electronic device 1 on the transmitting side.

Then, when the message data of the resend request is received, the electronic device 1 on the transmitting side re-executes the transmission which was stopped midway. In this way, when ambient light is generated, as shown in FIG.
When the electronic device 1 on the reception side detects the transmission stop, the electronic device 1 on the reception side issues a retransmission request to the electronic device 1 on the transmission side. Here, Shutdown in the figure represents the output pulse of the monostable multivibrator 24.

According to this configuration, the electronic device 1 of the present invention
Enables data communication to be performed without being affected by ambient light. Although the present invention has been disclosed in accordance with the illustrated embodiment, the present invention is not limited thereto. For example,
In the embodiment, the configuration in which the transmission stop is detected by using the count value of the counter 25 is adopted, but the present invention is not limited to this. You may take the structure to detect.

In the embodiment, the data communication is executed by using the wavelength in the infrared region, but the present invention is not limited to this. Further, in the embodiment, since the half-duplex communication type is used as the serial port control IC 23, the configuration for preparing the disturbance detection photodiode 22 is adopted, but it is possible to perform the transmission process and the reception process at the same time. When the dual communication type is used, it is not necessary to provide the disturbance detection photodiode 22 because it is possible to detect the disturbance light using the communication photodiode 21 during the transmission processing.

[0034]

As described above, in the electronic device of the present invention, the disturbance light is generated when the data communication is performed with the counterpart electronic device by using the light pulse train. Occasionally, a configuration is adopted in which transmission is stopped, and when an electronic device of the other party executes this transmission stop, when the abnormality of the pulse of light sent from the electronic device of the other party is detected, the electronic device of the other party is notified. On the other hand, since the retransmission request is issued, the data communication can be executed without being affected by the ambient light.

[Brief description of drawings]

FIG. 1 is a principle configuration diagram of the present invention.

FIG. 2 is an explanatory diagram of a data processing system configured using the present invention.

FIG. 3 is a time chart of the present invention.

FIG. 4 is a time chart of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electronic device 10 Light emitting means 11 Transmitting means 12 Light receiving means 13 Receiving means 14 Second light receiving means 15 First detecting means 16 First indicating means 17 Second detecting means 18 Second indicating means

Continued on the front page (51) Int.Cl. ⁶ Identification number Agency reference number FI Technical display location H04B 10/02 10/18

Claims (5)

[Claims] 1. An electronic device having an optical communication function, which comprises a transmitting means for generating an optical pulse by blinking a light emitting means in accordance with transmission data and transmitting the optical pulse to another device, and a second light receiving device for detecting ambient light. Means, first detecting means for detecting noise in the optical pulse generated by the transmitting means by monitoring the detection value of the second light receiving means, and the first detecting means detects noise. An electronic device having an optical communication function, comprising: a first instructing unit for instructing the transmitting unit to stop the transmission. 2. An electronic device having an optical communication function, which comprises a receiving means for obtaining transmission data of another device from an electrical signal of an optical pulse detected by the light receiving means, wherein the electrical signal of the optical pulse detected by the light receiving means is abnormal. Second detecting means for detecting, and a second instruction for generating a message of a resend request when the second detecting means detects an abnormality and instructing the transmitting means to transmit the message data. And an electronic device having an optical communication function. 3. Transmitting data for another device is obtained from transmitting means for generating an optical pulse by blinking a light emitting means according to the transmitted data and transmitting the optical pulse to the other device, and electric signals of the optical pulse detected by the light receiving means. In an electronic device having an optical communication function including a receiving means, the second light receiving means for detecting ambient light, and the transmitting means by monitoring the detection value of the second light receiving means when in the transmission mode. Detecting means for detecting noise in the optical pulse generated by the first detecting means, and first instructing means for instructing the transmitting means to stop transmission when the first detecting means detects noise. Second detection means for detecting an abnormality in the electric signal of the optical pulse detected by the light receiving means in the reception mode; and a message for requesting retransmission when the second detection means detects an abnormality. Generate Electronic device having further comprising a second instructing means for instructing the transmission of the message data to the transmission means, the optical communication function, wherein. 4. A transmitting means for generating an optical pulse by blinking a light emitting means according to transmission data and transmitting the optical pulse to another device, and a transmission processing by the transmitting means, which operates in parallel with each other. In an electronic device having an optical communication function, which includes a receiving unit that obtains transmission data of another device from an electric signal of an optical pulse detected by the light receiving unit, monitoring the detection value of the light receiving unit when in a transmission mode At the first detecting means for detecting noise in the optical pulse generated by the transmitting means, and for instructing the transmitting means to stop transmission when the first detecting means detects noise. 1 instructing means, a second detecting means for detecting an abnormality of an electric signal of an optical pulse detected by the light receiving means in the receiving mode, and a second detecting means for detecting an abnormality of the second detecting means, Resend request It generates a message, an electronic device having in that it comprises a second instructing means for instructing the transmission of the message data to the transmission means, the optical communication function, wherein. 5. The electronic device having an optical communication function according to claim 2, 3 or 4, wherein the second detecting means counts a signal level of no light included in the electric signal of the optical pulse detected by the light receiving means. An electronic device having an optical communication function characterized by detecting an abnormality in an electric signal of the optical pulse by using a counter.