JPS6117635Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a counting machine constructed by using LSI of an electronic desktop calculator as is.

Currently, in order to count using a calculator, a person has to manually set a mechanical keyboard switch such as "1", "+", "1", "+", "1", "+", etc. Or, in the case of a device that has a constant calculation function, it must be operated as, for example, "1", "+", "=", "=", etc. However, in any of these operating methods, there is not a one-to-one correspondence between the number of keystrokes and the counting result, and it is necessary to press keys at discrete positions on the keyboard.
Because of this inconvenience, electronic desktop calculators could not be used as counting machines.

The present invention eliminates these drawbacks and realizes a counter that can be easily operated. Examples thereof will be described below with reference to FIGS. 1 to 3. In the drawing, 10 to 19 are key switches for "0", "1"..."9", 20 is a key switch for decimal point, 21 is a key switch for "+", 22 is a key switch for "-", and 23 is a key switch for "-". Key switch for “×”, 24 is key switch for “÷”, 25
is the key switch for “=”. 26 is the main body of the computer including an LSI such as an arithmetic circuit and a display.
27, 28, 29, and 30 are semiconductor switches that become conductive when a control pulse is applied, respectively.
Reference numeral 31 indicates semiconductor switches 27, 28, 29, 3 when a trigger signal is applied from the trigger generation circuit 32.
This is a pulse generation circuit that sequentially applies control pulses to 0.

Figure 2 shows semiconductor switches 27 to 30, respectively.
A specific example configured with FETs is shown.

Further, FIG. 3 shows an example of the pulse generation circuit 31, which includes monostable multivibrators 33, 34,
It is composed of FETs 35, 36, 37, a resistor R, a capacitor C, etc.

Figure 4 shows signal waveforms, where A is the output of the trigger generation circuit 32, B is the output of the monostable multivibrator 33, C and D are the output of the monostable multivibrator 34 and its inverted output, and E is the output of the monostable multivibrator 34.
Output of FET35, F is output of FET36, G is
The outputs of FET37 are shown respectively.

Next, the operation will be explained. First, in the pulse generating circuit 31 shown in FIG. 3, when the trigger generating circuit 32 generates a single pulse at regular intervals, the monostable multivibrator 33 is activated. The output is applied to the CR differentiation circuit, and FET 35 is made conductive for time t ₂ to generate an output pulse. This time t ₂ is for calculator
Assume that the time is sufficient for the LSI to accept it as a key input. The calculator LSI then completes the necessary calculations during time _t3 . Over time, the monostable multivibrator 33 closes. At the same time, the monostable multivibrator 34 operates, and in the same way, the FET ₃₆
It conducts for a certain amount of time and generates an output. More for calculator
After the LSI completes its calculation during time _t5 , the monostable multivibrator 34 closes. At the same time FET3
7 is conductive for a period of t(6) and generates a pulse.

In this manner, the pulse generating circuit 31 generates pulses. This pulse is transmitted to semiconductor switches 29, 3
0 and 28 in sequence, it is equivalent to pressing key switches "2", "3", and "+" in sequence. That is, each time the trigger generation circuit 32 generates one pulse, it is possible to sequentially add 23.

Here, the addition count of 23 is just one example, and by appropriately replacing the positions of the semiconductor switches on the key matrix, an electronic counter that adds other numbers, for example, by 10, can be easily constructed. Furthermore, by opening the semiconductor switch and pressing a mechanical switch using a conventional keyboard, it can be configured to be used as a proper electronic desktop calculator.

Furthermore, telephone charges and the like can be counted by configuring the trigger generation circuit 32 to automatically generate a trigger signal at regular intervals.

Furthermore, although each of the above-mentioned embodiments describes counting up, it is also possible to first set an initial value using a key switch and then count down.

As is clear from the above embodiments, according to the present invention, a counter can be configured without making any major changes to the configuration of an electronic desktop calculator. Further, the counter is easy to operate because it can perform counting with one operation.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of an electronic counter according to an embodiment of the present invention, Fig. 2 is a specific block diagram of the main parts, Fig. 3 is a specific block diagram of other main parts, and Fig. 4 is a signal waveform diagram thereof. It is. 10-25...Key switch, 26...Main body,
27-30...Semiconductor switch, 31...Pulse generation circuit, 32...Trigger generation circuit.

Claims (1)

[Scope of utility model registration request] An electronic counter body that performs calculations by short-circuiting signal lines arranged in a matrix by pressing the four arithmetic operation keys and number keys, and is connected to the matrix-shaped signal lines in parallel to the four arithmetic operation keys and number keys. and a pulse generation circuit that sends out a plurality of pulses with different timings from a plurality of lines by capturing a trigger signal, and the semiconductor switch is made conductive by the signal of the pulse generation circuit. Electronic counting machine.