JP2876492B2 - Optical coupling terminal device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable optical coupling terminal device called a handy terminal.

[0002]

2. Description of the Related Art Conventionally, this type of optical coupling terminal device has a key operation unit and a liquid crystal display unit in a palm-sized main body.
A CPU, a memory, and the like are incorporated therein. A bar code reader or a printer can be connected to the main body, and a bar code can be read and input, and the result can be printed on paper. Also, the input data can be transmitted to the host computer through an optical connector or in a non-contact manner by infrared rays or the like.

[0003]

However, in the conventional optical coupling terminal device, when a printer is provided, there is a problem that the weight including the battery becomes large and it is inconvenient to carry.

Further, when the portable terminal body and the printer are separated from each other, the two must be connected by an electric wire, and there has been a problem that the electric wire becomes a hindrance when the connecting portion is disconnected or used.

[0005] Further, the conventional optical coupling terminal device has a problem that power consumption is large and the life of a battery is short when performing optical transmission.

An object of the present invention is to solve such a conventional problem, and an object of the present invention is to provide an optical coupling terminal device which is portable and consumes less power.

[0007]

SUMMARY OF THE INVENTION According to the present invention, a portable terminal and a printer are provided separately to achieve the above object.
Data transmission between the two is performed by non-contact optical communication, and the optical communication is performed by a novel method with low power consumption.

[0008] The optical coupling terminal device according to the present invention comprises a digital
The rising and falling edges of the data signal
It is modulated into optical signals with different bals radiation corresponding to each.
A portable terminal for receiving and outputting the output optical signal.
Receiving device for receiving and demodulating to the original digital data signal
In the optical coupling terminal device provided with:
Rise of modulated electrical signal converted from transmitted optical signal
The rising edge detection circuit that detects
And an inverted output of the modulated electric signal.
NOT circuit, the output of the counter and the NOT circuit
A first AND circuit which takes a logical product with the output of
A second logical product of the output of the counter and the modulated electrical signal.
And an AND circuit, from the outputs of the two AND circuits.
Demodulating an original digital data signal .

[0009]

DETAILED DESCRIPTION OF THE INVENTION The present invention, the above-described configuration, for example, the rise and fall of the character code signal is modulated output to wide light pulse and a narrow optical pulses in the portable terminal side, the printer side By detecting whether it is divergent or narrow, the rise and fall of the original character code signal can be demodulated. Therefore, by driving the print head based on the demodulated character code signal, it is possible to perform printing even when the printer is fixed to a position separated from the portable terminal, for example, a waist belt. The use of the machine becomes extremely simple. Further, since the optical transmission is performed only at the changing point of the character code signal, the power consumption can be greatly reduced.

[0010]

FIG. 1 shows the configuration of an embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a portable terminal, which includes a transfer light emitting unit 2, a liquid crystal display unit 3, a key operation unit 4, a connector 5 for connecting to an external device such as a personal computer, and the like. Reference numeral 6 denotes a printer, which is a transfer light receiving section 7 for receiving a transfer optical signal from the transfer light emitting section 2 of the portable terminal 1, and which demodulates the transfer optical signal to an original character code electric signal by an O / E converter and prints it. A control unit 9 for driving the head 8,
Ink ribbon 1 for printing characters on roll paper 10
1, a power supply 12 and the like.

FIG. 2 shows the internal configuration of the portable terminal 1, wherein 13 is a CPU, 14 is a ROM, 15 is a RAM,
6 is an E / O converter, 17 is an interface, and 18 is a power supply. The CPU 13 performs various calculations based on the data stored in the ROM 14 and the RAM 15.
The liquid crystal display unit 3 displays input and output, and the key operation unit 4 is used to input necessary information from ten keys and function keys. E / O converter 1
Reference numeral 6 denotes an RO corresponding to the character input from the key operation unit 4.
The bit sequence of the character code read from M14 is modulated into an optical signal according to a method described later and output from the transfer light emitting unit 2. The interface 17 enables communication with a personal computer or the like connected through the connector 5. These units are driven by receiving power from a power supply 18.

Next, the overall operation of this embodiment will be outlined with reference to FIG. Now, for example, when the character “A” is input from the key operation unit 4, the character code of the character “A” is changed to the international alphabet No. According to the 5-basic 7-unit code table, it becomes "1000001", so that the electric signal 21 as shown in FIG. Next, this bit string is first converted into an electric signal 22 as shown in FIG. That is, a narrow pulse A is generated in response to the rise of the electric signal 21, and a wide pulse B is generated in response to the fall. Next, the light emitting element is driven by using the electric signal 22 to generate a transfer light signal 23 as shown in FIG. On the other hand, on the printer 6 side, the electric signal 22 is reproduced from the wide pulse B 'and the narrow pulse A' of the transfer optical signal 23 received by the transfer light receiving unit 7, and this is called "A" of the original character code. The signal is demodulated into an electric signal 21. Then, based on the electric signal 21 of “A”, the print head 8
Is converted into another electric signal for driving the matrix-shaped printing wire, and the character "A" is printed.

When data transmission is performed in a start-stop manner, a transmission optical signal 23 transmitted from the transmission light emitting unit 2 of the portable terminal 1 has a start bit added before a character bit, and a parity bit and a stop bit after the character bit. Is added and transmitted. In such data transmission, the receiving side normally sends a response signal such as an ACK signal. In this embodiment, the data transmission is actually provided in the transfer light receiving section 7 of the printer 6 according to a predetermined sequence. Some response signals are emitted from the light emitting element to the transfer light emitting section 2 of the portable terminal 1, and the transfer light emitting section 2 receives the response signal by the light receiving element.

Next, details of the E / O converter 16 will be described with reference to FIG. In FIG. 4, reference numeral 24 denotes a rising edge detection circuit for detecting the rising edge of the input character code corresponding electric signal 21; 25, a pulse A output circuit for generating and outputting a narrow pulse A from the detected rising edge signal; A falling detection circuit for detecting the falling of the electric signal 21; a pulse B output circuit 27 for generating and outputting a wide pulse B having a width twice as large as the pulse A from the detected falling signal; A combining circuit that combines the outputs from the A output circuit 25 and the pulse B output circuit 27 to obtain a modulated electric signal 22. 29 is a light emitting circuit that converts the combined modulated electric signal 22 into a transfer optical signal 23 and outputs the transfer optical signal 23. It is.

Next, the operation of the rise detection circuit 24 and the fall detection circuit 26 will be described with reference to FIG. First, a logical product of the input electric signal 21 corresponding to the character code and a signal obtained by inverting the electric signal 21 by the NOT circuit 24a are output by the next positive signal AND circuit 24b and output to OUT1 to detect a rise. Next, the input electric signal 21 and a signal obtained by inverting the electric signal 21 by the NOT circuit 26a are logically ANDed by the next negative signal AND circuit 26b to obtain the signal OUT2.
Is output to detect the falling edge. In this case, OUT1 is output at the rising timing of t1, and OUT2 is output at the falling timing of t2. These outputs are respectively input to a pulse A output circuit 25 and a pulse B output circuit 27 each constituted by a one-shot multi-circuit shown in FIG. 4 to output pulses A and B having a predetermined width, respectively. These pulses A and B are combined by the next combining circuit 28 to become a modulated electric signal 22, and the modulated electric signal 22 drives a light emitting element inside the light emitting circuit 29 to have a similar pulse width. A transfer optical signal 23 is generated and output from the transfer light emitting unit 2 in FIG.

Next, the processing on the printer 6 side which receives the transfer optical signal 23 will be described. As shown in FIG. 6, the control unit 9 of the printer 6 includes an O / E conversion unit 31, a pulse A detection circuit 32, a pulse B detection circuit 33, a reference clock 34, an SR
A flip-flop circuit 35 and the like are provided. The transfer optical signal 23 is returned by the O / E converter 31 to a modulated electric signal 22 having pulses A and B corresponding to the optical pulses A ′ and B ′. The detection is performed by the detection circuit 32 and the pulse B detection circuit 33.

As shown in FIG. 7, the pulse A detection circuit 32 and the pulse B detection circuit 33 detect the rising of the modulated electric signal 22 having the pulses A and B, and count the clock of the reference clock 34. A quinary counter 42, a NOT circuit 45 for obtaining an inverted output of the modulated electric signal 22, an AND circuit 47 for obtaining a logical product of an output 44 of the quinary counter 42 and an output 46 of the NOT circuit 45, An AND circuit 48 for calculating the logical product of the output 44 of the signal 42 and the modulated electric signal 22 is provided.

Next, the operation of the control section 9 will be described with reference to FIGS. 6, 7 and 8. O / E converter 3
1, the pulses A and B of the modulated electric signal 22 converted from the transfer optical signal 23 are constantly monitored by the rising detection circuit 41, and the rising signal 4 of the pulse A
When 3 is detected, 5 is detected at the fifth pulse of the reference clock 34.
The binary counter 42 outputs a count signal 44. The decimal number in the quinary counter 42 is selected so that the pulse A has less than 5 pulses and the pulse B has more than 5 pulses. Therefore, in the case of pulse A, when 5 pulses are counted, the modulated electric signal 22
Is inverted by the NOT circuit 45, and the output 46 is "1". Therefore, the output OUT3 can be obtained by taking the logical product of the signals 44 and 46 by the AND circuit 47. In the case of pulse B, since the modulated electric signal 22 is still "1" when 5 pulses have been counted, the logical product of the modulated electric signal 22 and the quinary counter output signal 44 is calculated as AN.
The output OUT4 can be obtained by using the D circuit 48. Then, by inputting the outputs OUT3 and OUT4 to the SR flip-flop circuit 35, the electric signal 21 corresponding to the original character code can be demodulated and obtained.

As described above, according to the above-described embodiment, the portable terminal 1 and the printer 6 are separated, and different pulse widths A and B corresponding to the rise and fall of the character code signal are provided therebetween. Since the optical signal 23 is transferred to perform data transmission, the portable terminal 1 can be reduced in size and weight, and a heavy printer can be fixed to, for example, a waist belt. Further, since only the changing point of the electric signal is transferred as the optical signal, it is possible to prevent an increase in power consumption even if the same electric signal continues for a long time.

In the above embodiment, a bar code reader is connected to the portable terminal 1 to read a bar code, convert the bar code into a corresponding character code signal, and send the same to the printer 6 for printing. Can be.

When the printer 6 is also used as a bar code printer, the rising edge of the bar code when it changes from black to white is set to a narrow pulse A, and the rising edge of the bar code when it changes from white to black. An optical transfer signal is generated as a wide pulse B at the falling, and an arbitrary bar code identification code is added to the signal and transferred to the printer 6 side, so that the bar code signal is different from the character code signal on the printer 6 side. Can be identified, so that a barcode can be printed.

[0022]

As described above, according to the present invention, the digital
The rising and falling edges of the
Modulated into optical signals with different bals radiation corresponding to each
Portable terminal that receives and outputs an optical signal
And a receiving device for demodulating the original digital data signal.
In the optical coupling terminal device provided, the receiving device receives
Detects rising edge of modulated electric signal converted from optical signal
Rising edge detection circuit that counts the reference clock.
Counter to obtain inverted output of modulated electric signal
And the logical product of the output of the counter and the output of the NOT circuit
A first AND circuit which takes the output of the counter and the modulated electrical signal
And a second AND circuit that takes a logical product with the signal
Original digital data signal from outputs of two AND circuits
Demodulation, it is possible to eliminate wire breaks and inconvenience in handling.In addition, the circuit configuration is simple and the equipment is inexpensive. Since it is used, power consumption can be greatly reduced.

[Brief description of the drawings]

FIG. 1 is a system configuration diagram showing an overall configuration in an embodiment of the present invention.

FIG. 2 is a schematic block diagram showing an internal configuration of the portable terminal in the embodiment.

FIG. 3 is a signal waveform diagram for explaining an overall operation in the embodiment.

FIG. 4 is a schematic block diagram of a transfer light emitting unit in the embodiment.

FIG. 5 is a circuit diagram of a rising and falling detecting circuit in the transfer light emitting unit.

FIG. 6 is a schematic block diagram of a transfer light receiving unit in the embodiment.

FIG. 7 shows a pulse A and a pulse B in the transfer light receiving section.
Schematic block diagram of detection circuit

FIG. 8 is a signal waveform diagram for explaining an operation in the transfer light receiving unit.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Portable terminal 2 Transfer light emitting part 3 Liquid crystal display part 4 Key operation part 5 Connector 6 Printer 7 Transfer light receiving part 8 Print head 9 Control part 10 Roll paper 11 Ink ribbon 12 Power supply 13 CPU 14 ROM 15 RAM 16 E / O conversion Section 17 Interface 18 Power supply 21 Character code compatible electric signal 22 Character code compatible modulated signal 23 Character code compatible optical transfer signal

Claims (1)

(57) [Claims] 1. A portable terminal which detects rising and falling edges of a digital data signal, modulates the digital signal into optical signals having different pulse widths, and outputs the modulated optical signals. optical coupling terminal smell and a receiving apparatus for demodulating the original digital data signal <br/> No.
Thus, the receiving device converts the converted optical signal from the received optical signal.
Rise detection circuit that detects the rise of the electric modulation signal
A counter for counting a reference clock, and the modulation
NOT circuit for obtaining inverted output of electric signal, and said counter
Of the NOT circuit and the output of the NOT circuit
AND circuit, output of the counter and modulated electric signal
And a second AND circuit that takes a logical product of
The original digital data signal from the output of the AND circuit
An optical coupling terminal device, comprising: