JPH04520A - Compact electronic device - Google Patents

Abstract

PURPOSE:To make it possible to simultaneously communicate information from one transmitting equipment to plural receiving equipments and to improve the degree of freedom of transmission/reception by using infrared rays for transmitting/receiving character/graphic information without using a cable. CONSTITUTION:Although an input to a CPU 5 is normally is set up to a high level by a pull-up resistor 11, the ON of an infrared phototransistor (PTR) 12 turns the input to the CPU 5 to a low level. Thereby, a character graphic signal 8 sent from the external by infrared rays can be received as serial data by the principle. When the output port of the CPU 5 is connected to the reset terminal of an oscillator 13 for outputting 40kHz, the ON/OFF of oscillation can be controlled by using the reset input, and when the output of the oscillator 13 is in the high level, a TR 15 is turned on and infrared rays are projected from an infrared-ray emitting diode 14. Thereby, a character graphic signal can be transmitted from the diode 14.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to small electronic devices, and more particularly to the transmission and reception of character and graphic information using infrared rays in small electronic devices.

[Prior Art] In conventional small electronic devices, information communication using a cable such as an R3-2320 interface or a Centronics interface has been used for transmitting and receiving character and graphic information.

[Problem and purpose to be solved by the invention] However, when transmitting and receiving character and graphic information using this cable, unless a special cable is used, it is not possible to transmit from one transmitting device to multiple receiving devices at the same time. The transmission distance was also regulated by the length of the cable.

SUMMARY OF THE INVENTION An object of the present invention is to provide a small electronic device having a function of transmitting character and graphic information from one transmitting device to a plurality of receiving devices at the same time without using cables. A further object of the present invention is to provide a small electronic device whose transmission distance is not restricted.

[Means for Solving the Problems] In order to solve the above problems, a small electronic device of the present invention includes a character and graphic input device such as a tablet and a keyboard, a display device that displays character and graphic information input by the input device, In a small electronic device integrated with a control device that controls the input and display of the character and graphic information, the character and graphic information input from the input device is displayed on the display device and transmitted to the outside by infrared rays. and receiving means for receiving character and graphic information sent from the outside by infrared rays and displaying it on the display device.

[Embodiment] FIG. 1 is a block diagram of an embodiment in which the present invention is applied to an electronic notebook. In the figure, 1 is a character/graphic input device such as a tablet or keyboard, 2 is a display device for displaying characters and graphics, 3 is a receiving device for receiving character/graphic information sent by infrared rays from an external device 7, and 4 is a character/graphic input device. A transmitting device for transmitting graphic information to an external device 7 by infrared rays; 5 is a central processing unit (hereinafter referred to as CPU) that performs a series of controls regarding character and graphic information such as inputting, displaying, transmitting and receiving, and recording character and graphic information; 6 is a central processing unit (hereinafter referred to as CPU); This is a recording device for recording character and graphic information sent from the CPU 5. Character and graphic information input from the input device 1 is displayed on the display device 2 by the CPU 5 and recorded on the recording device 6. At the same time, the transmitting device 4 transmits to the external device 7 as a character/figure signal 9 by infrared rays. On the other hand, the infrared character/figure signal 8 sent from the external device 7 is received by the receiving device 3, displayed on the display device 2 by the CPU 5, and recorded in the recording device 6.

FIG. 2 is a circuit diagram of a transmitting/receiving device. First, the principle of the receiving means will be explained. The input to the CPU (5) in the figure is normally brought to a high level by a pull-up resistor 11. When infrared rays are incident on the infrared phototransistor 12, the infrared phototransistor 12 is turned on and the input to the CPU 5 becomes low level. Based on this principle, it is possible to receive character and graphic signals 8 (serial data) sent from the outside by infrared rays.

Next, to explain the principle of the transmitting means, 13 in the figure is 40kHz.
The output port of CPU5 is transmitter 1 which outputs z.
It is connected to the reset terminal of No. 3, and uses the reset input to perform 0N10FF control of transmission. When the output of the oscillator 13 is at a high level, the transistor 15
is turned on and infrared light is emitted from the infrared light emitting diode 14. In other words, when the CPU 5 outputs serial data of character and graphic information, the infrared light emitting diode 14
A character/figure signal 9 using infrared rays is transmitted.

FIG. 3 shows an embodiment in which the present invention is applied to an electronic notebook and infrared communication is performed. Electronic notebooks A and B in the figure are the same, and when a figure is entered by hand on the tablet 21 of electronic notebook A, the figure is transferred to the tablet 2 as well.
1, and a graphic signal 9 by infrared rays is transmitted to the outside (electronic notebook B). On the other hand, electronic notebook B is electronic notebook A.
The graphic signal 9 by infrared rays transmitted from the tablet 23 is received and displayed on the tablet 23. In other words, the graphical information input into electronic notebook A is displayed on electronic notebooks A and B along with the input. Similarly, when a figure is input by hand into the tablet 23 of the electronic notebook B, the input figure information is displayed on the electronic notebooks A and H along with the input.

Further, when the input device is a keyboard, when characters are inputted from the keyboard 22 of the electronic notebook A, the characters are displayed on the tablet 21 along with the input, and a character signal 9 by infrared rays is transmitted to the outside (electronic notebook B). On the other hand, the electronic notebook B receives the infrared character signal 9 transmitted from the electronic notebook A and displays it on the tablet 23. In other words, the character information entered in electronic notebook A is also input to electronic notebooks A and B.
will be displayed. Similarly, when characters are input using the keyboard 24 of electronic notebook B, the input character information is displayed on electronic notebooks A and H along with the input. By using these functions, you can exchange messages and have conversations using your electronic notebook.

In terms of communication distance, communication is possible within the reach of infrared rays, so there is no need to prepare a long cable just because the communication distance has increased.

Further, although this embodiment uses two electronic notebooks A and H, the same result can be obtained even if there are three or more electronic notebooks, just by having a plurality of electronic notebooks on the receiving side.

[Effects of the Invention] As described above, according to the present invention, infrared rays are used instead of cables for transmitting and receiving text and graphic information, so text and graphic information can be transmitted from one transmitting device to a plurality of receiving devices at the same time.

Furthermore, since the transmission distance is not restricted by the length of the cable, it is possible to transmit and receive with a high degree of freedom.

l・ 2・ 3・ 4・ 5・ 21・ 22・ 23・ 24・ A, B・ input device display device receiving device transmitting device central processing unit recording device Tablet (electronic notebook A) Keyboard (electronic notebook A) Tablet (electronic notebook B) Keyboard (electronic notebook B) electronic notebook (CPU) that's all Applicant: Seiko Epson Corporation Representative Patent Attorney Kizobe Suzuki (1 other person)

[Brief explanation of drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention. FIG. 2 is a circuit diagram showing one embodiment of the present invention. FIG. 3 is an external view showing one embodiment of the present invention. Figure 1 Figure 3 Figure 2

Claims (1)

[Scope of Claims] A character and graphic input device such as a tablet or a keyboard, a display device that displays character and graphic information input by the input device, and a control device that controls input and display of the character and graphic information. The integrated small electronic device includes a transmitting means for displaying text and graphic information input from the input device on the display device and transmitting it to the outside by infrared rays, and receiving text and graphic information sent from the outside by infrared rays. and receiving means for displaying information on the display device.