JPS63298931A - Key input device - Google Patents

Abstract

PURPOSE:To enable to respond to the increase of the number of keys of a keyboard easily by composing a matrix with two kinds of input terminals, an ordinary input terminal and an A/D input terminal. CONSTITUTION:When a power key is depressed, input signals are given to an input terminal K1 and an A/D input terminal of a microcomputer 5a respectively. A PV pattern of the key contact of a contact sheet 13 is being connected to +5V, and when the contact is closed, 'H' level is input to the input terminal K1, while the other input terminals K2 to K4 are at 'L' level. And at the A/D input terminal A/D1, when the contact is closed by applying a potential +5V from the key contact 13 to a buzzer circuit, A/D level is input, by which the power key being depressed can be determined. Consequently, by increasing the resolution level of the A/D input terminal, the device can respond to the increase of the key number of the keyboard easily.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to key human power devices such as membranes.

BACKGROUND OF THE INVENTION In recent years, devices equipped with control circuits including microcomputers have been equipped with an operating section equipped with an input keyboard 6, as shown in FIG. There is. In the conventional key manual method, Fig. 8 (&)
As shown in Figure 2, the mainstream is a matrix circuit consisting of a microcomputer output signal system and a human input signal system. The switch portion of this key matrix type keyboard includes microswitches and membrane structures.

Furthermore, a manual key system using an analog/digital conversion input (hereinafter referred to as A/D input) as shown in FIG. 8(b) has also been considered.

Problems to be Solved by the Invention However, in the case of the above-mentioned IJ sock type, the more complicated the operation of the device becomes, the more the number of keys on the keyboard will increase, and no matter how much the matrix type is used, the number of input/output terminals will still increase. This results in a shortage of input/output terminals for the content that should be controlled. Also, the number of signal cables between the keyboard and this control device has been increased.

The cost increases due to the connectors, wires, etc.

Generally, it is considered that the maximum is a 24-key configuration with 6 outputs x 4 human power.

In addition, in the case of the A/D input method, when processing a large number of keys, it is necessary to increase the resolution of the M/D input and the number of its terminals. It is necessary to make one, and there are many problems in terms of cost and implementation. Furthermore, it is thought that the number of M/D input terminals for keys will be increased to two at most because they are necessary for inputting sensors and the like.

The present invention solves the above-mentioned conventional drawbacks, and aims to provide an effective key reading system in place of the key matrix system and A/D input system in the manual key system of the operating section.

Means for Solving the Problems In order to achieve the above object, the manual key system of the present invention utilizes the general input terminal and A/D input terminal of the microcomputer, and displays the above two types on an easy-to-operate membrane type keyboard. A conductive sheet and a character sheet are sandwiched between a contact sheet and a spacer sheet, which have three types of contacts: a pattern connected to the terminal of the terminal, and a power supply pattern, and a conductive sheet and a character sheet are placed on top of the contact sheet, and when a key is pressed, the conductive note opens the spacer. The three types of contacts are short-circuited through the contact sheet, and electrical signals are transmitted to the two types of terminals and transmitted to the microcomputer, which determines the type of key.

Operation The present invention has the above-mentioned structure, and although the external appearance is a conventional membrane type keyboard, the interior uses conventional output terminals.
Since the matrix is made up of two types of input terminals, the number of keys increases by simply increasing the resolution of the A/D input to increase the number of keys by the number of general input terminals.

With the normal number of keys, the number of input terminals can be reduced and no output terminals are used, so the control range can be expanded by utilizing the surplus output terminals, and specifications and performance can be improved. Furthermore, the ROM capacity of the microcomputer can be set in the same steps as the conventional one.

EXAMPLE Hereinafter, an example of the present invention will be described based on the drawings. FIG. 2 shows an external view of a high-frequency heating device according to an embodiment of the present invention. Reference numeral 1 denotes a main body of a high-frequency heating device, and a heating chamber 2 is provided within this main body 1. Heating chamber 2
A stun and a turntable (not shown) are installed inside to make the distribution of radio waves more uniform and to improve the finish of the food. Reference numeral 3 denotes an operation section provided at the opening of the heating chamber 2, which is provided for the user to set a cooking sequence such as a cooking output of 1 hour, etc. In the operation section 4, there is a control circuit device including a microcomputer 5a. 5 and a keyboard 6 for transmitting the user's intention to the microcomputer. Based on the input signals and information given from the keyboard 3 to the microcomputer 6a, the microcomputer 6a executes and controls the cooking sequence according to the contents already programmed.

FIG. 3 shows a main circuit of a high-frequency heating device according to an embodiment of the present invention. A transformer 8, which is equipped with a magnetron 7 as a high-frequency oscillator and supplies power to the magnetron 7. and open/close the power supply to the transformer 8, and the magnetron 7
A switch 9 is provided to intermittent high frequency output. The microcomputer 5a also has normal input terminals 1 to 4. Each terminal is connected to correspond to each key on the keyboard 6, and is connected to the voltage (5V in this case) that serves as the power source for the M/D input along with the power supply for the microcomputer 5a.
) is also connected to the keyboard 6. Keyboard 6 has oysters for cooking.

There are keys such as a cooking time key and a start key.
Each key is provided with an independent switch function, and each switch function is configured to open/close the input terminals (K1 to 4/D1) of the input terminal.

In FIG. 4, the configuration of the switch function of the key portion of the keyboard 6 is shown. 1o is a character sheet panel that clearly indicates the position of the key part and constitutes the exterior part, and is designed to be easily understood by the user. A conductive sheet 11 coated with a conductive material such as aluminum is formed on the bottom of the conductive sheet 11, and a contact sheet 13 that forms the contacts of the switch function is formed on the bottom of the conductive sheet 11, forming a contact gap, and insulation is provided in areas other than the key contacts. There is a spacer 12 provided to ensure that the spacer 12
A space is provided in the contact portion so that the conductive sheet 11 and the contact sheet 13 are directly opposed to each other, and when the key portion is pressed, the conductive sheet 11 comes into contact with the contact provided on the contact sheet. ing.

Furthermore, a reinforcing plate 14 is provided to reinforce the entire structure.

Hereinafter, the effects of the above configuration will be explained.

When food is placed in the heating chamber 2 and each key on the keyboard 6 of the operation unit 4 is pressed to set the cooking time and output, the conductive sheet 11 at the position of the pressed key is bent.
The contacts provided on the contact/sheet 13 close the circuit through the spacers 12.

For example, suppose you press the Power key.

As shown in FIG. 4, input signals 1 and 1 are applied to the input terminal of the microcomputer 5&, and input signals are applied to the input terminal J1 of the microcomputer 5&. The Pv pattern of the key contact part of the contact sheet 13 is connected to +5V, and when the contact is closed, "Hi" level is input to the input terminal 1 from FIG.
．． 3. 4 is at the "Lo" level. Next, the mu/D input terminal/D1 connected to the contact provided on the same key is connected to the +6
When the contact is closed by applying the potential of v, the M/D level is input and the pressed key (Power key) is determined based on that level (level 1). Now set the resolution of the user circuit to 4 levels. Microcomputer 52
L is 1 to the input terminal, 2 to the input terminal, and 3 to the input terminal.

K4 and Human/D input terminal M/D10 It has a program processing that has a matrix configuration as shown in Table 1, and input is given to each input terminal by the pressed key, and the pressed key is Determine what key is,
Read this. In this case, from Figure 1, 'Poy6r'
This is the key.

Next, a method for determining each key will be explained with reference to FIG. The following four types of A/D voltages are input to the input/Ih terminal of the microcomputer 5a due to the resistance values R1, R2, R3, and Rx shown in FIG.

Level 1 = 5v Also, 4 general input terminals (K1. to 2. to 5°K4)
Since four keys are connected to each, a matrix table like the one shown in Figure 6 can be written.

That is, in the above example, if the POWER key is pressed, it will require one person's effort at level 1, and if it is 333, it will require three people's effort at level 3. The microcomputer 5a first selects the type of setting input (
4) is determined, then the level of the A/D input is determined and the type of key is determined. Also, the POVER, 312, 313, and 314 keys are connected to the level 1 voltage.

Priority position within each column. for example.

If you input the POWER key and S21 key at the same time 1
This is because level 1 voltage is generated at the terminal of person/D1,
The smaller the level number, the higher the priority. Therefore, the priority key can be realized by simply determining the position of the matrix,
There is no need for increased ROM and RAM capacity with programs.

As described above, according to this embodiment, compared to the conventional key matrix method, the number of input terminals for key scanning of the microcomputer 5& can be reduced, and by increasing the A/D input human/D resolution, the keyboard It is also possible to easily accommodate an increase in the number of keys. Further, since the output terminal of the key scan output of the microcomputer 5a is not used, it is possible to expand the use and control functions of external devices such as sensors and switches. In addition, by ensuring ample output terminals for the microcomputer 5a, the degree of freedom in designing programs for the microcomputer 5& is expanded, and as a result, there is an effect of creating a margin for the ROM capacity of the microcomputer 5a.

Furthermore, the present invention is advantageous in preventing migration between patterns, which is a problem in actual membrane construction, since voltage is applied to the patterns only when a key is pressed.

In addition, since only a small amount of resolution is required for Mu/D as shown in the examples, it is very advantageous in terms of accuracy when drawing a resistance pattern on an actual membrane.

Further, a second embodiment will be explained with reference to FIG. In this example, the number of keys can be doubled by simply increasing the number of Mu/D terminals by one.

In other words, create a similar matrix for the other M/D terminal, and set the input input to 1. can be doubled without an increase of 2.

The key determination table is as shown in FIG. Also, R1, which is the divided resistance of person/D. R2, R,, Rx are.

The person/D1 and the person/D2 can be the same or different, and their implementation is easy.

Incidentally, FIG. 7 shows a pattern diagram of the key manpower device.

Effects of the invention (1) Compared to the conventional key matrix method, the number of microcomputer input terminals can be reduced, and by increasing the resolution level of the mu/p input terminals, it is possible to easily cope with an increase in the number of keys on the keyboard. Can be done.

(2--Since the key matrix is composed of the setting input terminal and the M/D input terminal, the number of keys can be easily increased by simply increasing the number of terminals that have some margin.

(3) - Since the key matrix is composed of the setting input terminal and the Mu/D input terminal, there is no need to increase the precision of Bem/D compared to the conventional key matrix composed of only the Mu/D input terminal. Therefore, a patterned resistor can be constructed within the membrane and can be easily realized without increasing costs.

(4) Compared to the conventional key matrix method, since no microcomputer output terminals are used, these can be used to expand control functions such as the use and addition of external devices such as sensors and switches.

It also allows for detailed responses.

(5) Compared to the conventional key matrix method, the number of drawer patterns is reduced, so the number of connector pins that connect the membrane and P board can be reduced.

(6) Compared to the conventional key matrix method, since the key scan output terminal of the microcomputer is not used at all, the key scan program can be omitted, and the ROM capacity of the microcomputer can be increased.

(η Keys with high priority can be configured by simply arranging them, and can be realized without putting a burden on the program ROM.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of a key manpower device that is an embodiment of the present invention, FIG. 2 is an external view of a high-frequency heating device equipped with the same device, and FIG. 3 is a circuit diagram of the same high-frequency heating device. FIG. 4 is an exploded perspective view of the same key part, FIG. 5 is an explanatory diagram of the opening operation, FIG. 6 is an explanatory diagram of the operation of the second embodiment of the present invention, FIG. 7 is a diagram of the same pattern, and FIG. 8 is an explanatory diagram of the opening operation. FIG. 2 is a configuration diagram of a conventional key manpower device. 1...Main body, 4...Operation unit, 5a...
...Microcomputer, 6...Keyboard, 10.
...Key panel, 11 ... Conductive sheet,
12... Spacer sheet, 13... Contact sheet. Name of agent: Patent attorney Toshio Nakao and 1 other person 2nd
Figure 4 Figure 5

Claims (1)

[Claims] The keyboard includes an analog/digital conversion input terminal, a general input terminal, a control circuit device including a microcomputer with a programming function, and a membrane type keyboard that sends input signals to the microcomputer. There is a character sheet with printing etc. that makes it clear and makes up the external appearance, a conductive sheet made entirely of aluminum or other conductive material at the bottom, and a space at the position of each key at the bottom of the conductive sheet. a spacer sheet, and a contact sheet provided with first to third contact groups for each key at the bottom of the spacer sheet,
The first contact group for each key provided on the contact sheet was connected to the general input terminal of the microcomputer in a low resistance pattern, and the second contact group was printed on the same contact sheet. The character sheet is connected to the analog-to-digital conversion input of the microcomputer through a resistor group such as carbon, which generates several types of resistance values, and the third contact is connected to the power supply of the microcomputer, and the character sheet is pressurized. The key input device is configured such that the conductive sheet short-circuits three types of contacts on the contact sheet simultaneously through the space of the spacer sheet provided in the key portion.