JP3557635B2 - Electronic calculator - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to an electronic calculator used for teaching mathematical formulas, for example.
[0002]
[Prior art]
Conventionally, a high-performance function calculator has a display unit configured with a dot matrix on the entire surface. When a calculation formula is input, the input calculation formula is displayed on the display unit in its original arrangement, and an “EXE” key is pressed. The operation of the input expression is executed by the operation.
[0003]
As described above, the function calculator of the high-performance type has a high utility value for teaching mathematical formulas because the current input formulas are sequentially displayed and confirmed on the display unit, but the display unit is constituted by a dot matrix on the entire surface. In some cases, it is expensive and unrealistic for education.
[0004]
For this reason, as a conventional general educational computer, a low-priced computer in which a display unit is not a dot matrix type but is constituted by a day character segment suitable for displaying numbers is used.
[0005]
[Problems to be solved by the invention]
However, in the conventional educational computer in which the display unit is composed of the Japanese character segments, although it is inexpensive, it is not possible to display functions such as a binary operator and to display mathematical expressions, and it is not possible to perform function calculations. When performing, for example, when calculating “sin30”, the key operation needs to mathematically reverse the input procedure to “3”, “0”, and “sin”, which is inappropriate for educational use. .
[0006]
For this reason, there is a demand for a computer which is inexpensive and can perform a certain display suitable for learning the mathematical formula calculation.
SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to provide an electronic calculator suitable for learning at a low price and capable of displaying a calculation formula.
[0010]
[Means for Solving the Problems]
That is, that involved in the present invention electronic calculator is numeric display body in the center, and a display device comprising a character display body on the left and right sides, front置関number, and function keys and numeric keys including binary function Key input means, and numerical data keyed by the key input means are displayed on the numeric display of the display device, the prefix function is displayed on the left character display, and the binomial function is displayed on the right character display. A display control unit, an engineering mode setting unit for setting a display mode of the engineering unit, and control to display an engineering unit according to numerical data on a character display on the right side of the display device in the setting state of the engineering mode. a unit display control means for, in the setting state of the engineering mode, if the binomial function for numerical data displayed on said display device is a key input, the display of the engineering units by the unit display unit Sealed, in place of the display, characterized in that a binary function that is input the key and a display switching means for controlling so as to display the character display of the display device right.
[0011]
[Action]
In the electronic calculator according to the present invention, the numerical data of the calculation formula keyed in is displayed by a numeric display provided at the center of the display device, and the prefix function and the binomial function of the calculation formula are respectively Since the characters are displayed by the character display provided on both the left and right sides of the display device, the calculation formulas input by keys are sequentially displayed even if the display device is not configured by the entire character display.
In addition, it is possible to set a display mode of the engineering unit, and in the setting state of the engineering mode, control can be performed such that the engineering unit corresponding to the numerical data is displayed on the character display on the right side of the display device.
Further, in the setting state of the engineering mode, when the binomial function for the numerical data displayed on the display device is inputted by a key , the display of the engineering unit by the unit display means is stopped, and the display is replaced with the key input. The displayed binomial function can be controlled to be displayed on the character display on the right side of the display device .
[0015]
【Example】
An embodiment of the present invention will be described below with reference to the drawings.
FIG. 1 is a plan view showing a configuration of a liquid crystal display unit 10 of an electronic computer according to the present invention.
[0016]
The liquid crystal display unit 10 is provided with a 10-digit day character display unit 11 at the center thereof, and is provided with four dot display units 12 of, for example, 7 dots vertically and 5 dots horizontally at the upper left side. On the lower right side, a dot display section 13 of, for example, 5 dots vertically and 7 dots horizontally is provided.
[0017]
Here, the date character display unit 11 has numerical data, the left dot display unit 12 has a prefix function such as “sin” and “cos”, and the right dot display unit 13 has a rule. Is displayed as a binary function such as “×” or “÷” or an engineering unit such as “K” or “M” in the “ENG” (engineering) mode.
[0018]
Further, an index display section 14 using a small, two-digit day display is provided on the upper right side of the liquid crystal display section 10, and "COMP", "LD", "SD", " ENG "is provided.
[0019]
FIG. 2 is a block diagram showing a configuration of an electronic circuit of the electronic computer.
The electronic computer includes a central processing unit (CPU) 21.
The CPU 21 activates a system program stored in the ROM 23 in advance in response to a key operation signal supplied from the key input unit 22, and controls the operation of each circuit unit. In addition to the RAM 22 and the ROM 23, a RAM 24 is connected, and the liquid crystal display unit 10 is connected via a display RAM 25.
[0020]
In the key input unit 22, numerical keys "0 to 9" for inputting an arbitrary calculation formula, a binary function key "+,-, x, +", a prefix function key "sin, cos, tan", A parenthesis key "()", an equality key "=", and the like are provided, and a mode selection key for selecting an operation mode or a display mode is provided.
[0021]
The RAM 24 has a key buffer 24a for temporarily storing key input data in the key input unit 22, an operation register 24b in which the number of operations and the operand are stored as X and Y data, and a key input operation of a calculation formula. An operator stack register 24c for stacking already input operators, and a data stack register 24d for writing / reading data to / from the CPU 21 in accordance with various arithmetic processes are provided.
[0022]
The display RAM 25 has a data storage area corresponding to each of the display units 11, 12, 13, 14, and 15 in the liquid crystal display unit 10. Calculation formulas and operation data to be displayed on the liquid crystal display unit 10 are stored in the display RAM 25. It is generated by the CPU 21 and written into the display RAM 25.
[0023]
Next, the operation of the electronic computer having the above configuration will be described.
FIG. 3 is a flowchart showing a calculation process by the electronic computer.
FIG. 4 is a flowchart showing a display process accompanying the calculation process of the electronic computer.
[0024]
FIG. 5 is a diagram showing an input operation of a calculation expression including a prefix function operation by the electronic computer and a display operation thereof.
Here, the case of calculating “123+ (sin 30 × 2)” will be described.
[0025]
When the numerical key of the key input unit 22 is selected and operated to input "123", the numerical data "123" is written into the key buffer 24a in the RAM 24 and, as shown in FIG. The date is displayed on the date display unit 11 of the liquid crystal display unit 10 via the display RAM 25 (step S1 → S2, SA).
[0026]
That is, in the display processing in FIG. 4, first, after the display RAM 25 is cleared, numerical data “123” to be displayed at the present time is read from the key buffer 24 a of the RAM 24 and written into the display RAM 25, and the liquid crystal display unit 10 is displayed. Is displayed on the character display section 11 of the day (steps A1 and A2).
[0027]
In this case, in the same display processing (FIG. 4), the mode is further changed to “ENG” mode? Determination step (A3), writing display step (A4, A5, A6) for each of the exponent display section 14, left dot display section 13, and right dot display section 12, symbol writing display step (A7), and "2. After input of function key? However, since all of these processing steps are executed in accordance with the key input data and the calculation data stored in the RAM 24, the display steps 11 to 14 correspond to each other. If there is no data to be skipped, it will be automatically skipped.
[0028]
When the user selects the binary function key of the key input section 22 and inputs "+", the function data "+" is written into the key buffer 24a in the RAM 24 and shown in FIG. As described above, the numerical data "123" is continuously displayed on the date character display section 11, and the function data "+" is displayed on the right dot display section 13 (step S3 → S4, S5, SA).
[0029]
That is, in the display processing in FIG. 4, as the data to be displayed stored in the RAM 24, there are numerical data "123" and binomial function data "+", and the numerical data "123" A2 is displayed on the character display unit 11 through the processing of A2, and the binomial function data “+” is displayed on the right dot display unit 13 through the processing of the subsequent step A6.
[0030]
Then, by selecting and operating the parentheses key of the key input unit 22 and inputting “(”, the numerical data “123” and 2 that have been displayed on the date character display unit 11 and the dot display unit 13 on the right side up to that point are displayed. The term function data "+" is stacked in the operator stack register 24c, and the key input symbol data "(" is written into the key buffer 24a in the RAM 24 and, as shown in FIG. (Steps S6 to S9, S5, SA).
[0031]
That is, since the numerical data "123" and the binomial function data "+" are stacked in the operator stack register 24c, in the display processing in FIG. 4, the data to be displayed is newly written in the key buffer 24a. The symbol data "(" is present, and is displayed on the left dot display section 12 through the processing of steps A1 to A7.
[0032]
Then, by selecting and operating the prefix function key of the key input unit 22 and inputting "sin", the symbol data "(" displayed on the dot display unit 12 on the left side is further stacked in the operator stack register 24c. Then, the prefix function data "sin" is written into the key buffer 24a in the RAM 24, and is displayed on the left dot display section 12, as shown in FIG. 5D (steps S6 to S9). S5, SA).
[0033]
That is, in the display processing in FIG. 4, as the data to be displayed, the prefix function data “sin” newly written in the key buffer 24a exists, and after the processing of steps A1 to A5, the left dot is displayed. It is displayed on the display unit 12.
[0034]
When the numerical key of the key input unit 22 is selected and operated to input "30", the numeral data "30" is written into the key buffer 24a in the RAM 24 and shown in FIG. As described above, the date is displayed on the character display unit 11 of the liquid crystal display unit 10 via the display RAM 25 (step S1 → S2, SA).
[0035]
That is, in the display processing in FIG. 4, as the data to be displayed, the prefix function data “sin” and the numerical data “30” written in the key buffer 24a exist, and the numerical data “30” is , Through the processing of steps A1 to A2, is displayed on the date display unit 11, and the prefix function data "sin" is displayed on the left dot display unit 12 through the processing of the subsequent step A5.
[0036]
When the user selects a binary function key of the key input unit 22 and inputs "x", the binary function data "x" is written into the key buffer 24a in the RAM 24, and the binary function " Since the prefix function “sin” has a higher calculation priority than the symbol “x”, “sin30” input after the symbol data “(” stacked in the operator stack register 24c is calculated and executed. As shown in FIG. 5 (F), the symbol data “(” is displayed on the left dot display unit 12, and the numerical value data “0.5” of “sin30” is displayed on the date character display unit 11, and the binomial function data “ “×” is displayed on the dot display unit 13 on the right side (step S3 → S4, S5, SA).
[0037]
That is, in the display processing in FIG. 4, as the to-be-displayed data, the symbol data "(" read from the operator stack register 24c, the arithmetic numerical data "0" which is arithmetically processed by the CPU 21 and written into the data stack register 24d. .5 "and the newly written binomial function data" x "in the key buffer 24a. The calculated numerical value data" 0.5 "is obtained by performing the processing of steps A1 to A2. The binomial function data “x” is displayed on the display unit 11, and is displayed on the right dot display unit 13 through the processing of the subsequent step A 6, and the symbol data “(” is processed by the subsequent processing of step A 7. After that, it is displayed on the dot display section 12 on the left side.
[0038]
Then, when the numerical key of the key input section 22 is selected and operated to input "2", the key input numerical data "2" is processed through the processing of steps S1 to SA, as shown in FIG. The date is displayed on the character display unit 11.
[0039]
Then, when “=” is input using the equality key, the arithmetic processing corresponding to the mathematical expression data “123+ (0.5 × 2)” sequentially stored in each register in the RAM 24 is performed by the CPU 21 through the processing of steps S10 to S12. As shown in FIG. 5H, the key input symbol data "=" is displayed on the left dot display unit 12, and the calculation result numerical data "124" is displayed on the date character display unit. 11 is displayed.
[0040]
As a result, the calculation formula including the prefix function operation is input and displayed by a key according to a mathematical procedure, and the operation process is executed.
FIG. 6 is a diagram showing an input operation of a calculation formula in the "ENG" (engineering) mode by the electronic computer and a display operation thereof.
[0041]
Here, a case will be described in which a calculation formula is input as “123 × 456 = × 789 =” and the calculation is executed.
First, in a state where the “ENG” mode is selected by the mode selection key of the key input unit 22 and the mode display unit 15 of the liquid crystal display unit 10 is lit and displayed, when a numeric key is selected and operated to input “123”, After the processing of steps S1, A2, and SA, the numerical data "123" is written into the key buffer 24a of the RAM 24, and then, as shown in FIG. Displayed on the display unit 11.
[0042]
When "x" is input using the binary function key, the binary function data "x" is written into the key buffer 24a through the processing of steps S3 to S5 and SA, and is also shown in FIG. As shown, it is displayed on the dot display unit 13 on the right.
[0043]
When "456" is input again by the numerical keys, the numerical data "456" is written into the key buffer 24a through the processing of steps S1, S2, and SA, as shown in FIG. 6C. Is displayed on the date character display unit 11.
[0044]
When “=” is input by the equality key, the operator data “123 × 456” keyed so far is stacked on the operator stack register 24c, and the keyed symbol data “=” is input. After newly written to the key buffer 24a, the stacked operator data "123 × 456" is transferred to the operation register 24b and executed (steps S6 to S9, S5).
[0045]
Then, as shown in FIG. 6 (D), the symbol data “=” is displayed on the left dot display section 12, and the numerical data “56.088 × 10 ³ ” calculated by the CPU 21 is stored in the data stack register 24d. The exponent is written as an engineering unit “K” and displayed on the right dot display unit 13, and the numerical data “56.088” multiplied by the engineering unit “K” is displayed on the date character display unit 11. (Step SA).
[0046]
In other words, in the display processing in FIG. 4, in step A3, it is determined that the mode is the “ENG” mode. (Step A4) is not performed, and is displayed on the right dot display section 13 as the engineering unit “K” through the processing of step A6.
[0047]
When "x" is input using the binomial function key, the engineering unit "K" is displayed as exponential data "03" as exponential data as shown in FIG. 6E through the processing of steps S3 to S5 and SA. The display is switched to the display unit 14, and the binomial function data “X” input by key is displayed on the dot display unit 13 on the right side.
[0048]
That is, in the display processing shown in FIG. 4, in step A3, it is determined that the mode is the "ENG" mode, and further, in step A8, it is determined that the key input is a binomial function. The section “03” is displayed on the exponent display section 14 through the processing of step A4, and the binomial function “x” input by key is displayed on the right dot display section 13 through the processing of step A6.
[0049]
When "789" is input using the numerical keys, the numeric data "789" is written into the key buffer 24a through the processing of steps S1, S2, and SA, and as shown in FIG. Is displayed on the date character display unit 11.
[0050]
When “=” is input by the equality key, the intermediate operation result data “56.088 × 10 ³ ” written in the data stack register 24 d and the numeric data “789” written in the key buffer 24 a are input. Is transferred to the operation register 24b, and the multiplication operation is executed (steps S10 → S11).
[0051]
Then, as shown in FIG. 6 (G), the symbol data “=” is displayed on the left dot display section 12, and the numerical data “44.253432 × 10 ⁶ ” calculated by the CPU 21 is stored in the data stack register. 24d, the exponent is displayed as an engineering unit "M" on the right dot display unit 13, and the numerical data "44.253432" multiplied by the engineering unit "M" is displayed on the date character display unit 11. (Step SA).
[0052]
That is, in the display processing in FIG. 4, it is determined in step A3 that the mode is the "ENG" mode, and it is determined in step A8 that the input is not a key input of a binomial function. Even if the section “10 ⁶ ” occurs, the index data writing and displaying process (step A4) is not performed on the exponent display section 14 and is displayed on the right dot display section 13 as the engineering unit “M” through the process of step A6. Is done.
[0053]
Accordingly, in the setting state of the “ENG” mode, the exponent part of the numerical data is displayed as an engineering unit on the dot display unit 13 on the right side of the liquid crystal display unit 10, and furthermore, in the display state of the engineering unit. When a binomial function is input by a key, the binomial function data is preferentially displayed in the dot display section 13 on the right side, and the exponent part of the numerical data is numerically displayed on the exponent display section 14. Therefore, even in the engineering unit display mode, the key input display according to the mathematical procedure can be performed.
[0054]
Therefore, according to the electronic calculator having the above-described configuration, the numerical data of the calculation formula input by the key is displayed on the date character display portion 11 provided at the center of the liquid crystal display portion 10, and the front end of the calculation formula is displayed. Since the function is displayed on the left dot display section 12 of the liquid crystal display section 10 and the binomial function is displayed on the right dot display section 13 of the liquid crystal display section 10, the liquid crystal display section 10 is constituted by a full-dot display body. Without doing so, it is possible to sequentially display the calculation formulas that have been keyed in.
[0055]
Further, when the prefix function is input by a key and displayed on the left dot display section 12 of the liquid crystal display section 10, the numerical data previously displayed on the date character display section 11 in the center of the liquid crystal display section 10 is cleared. Since the input function waits for input of numerical data to be operated on the prefix function displayed on the left dot display section 12, the function expression can be displayed by key input according to the mathematical input procedure. .
[0056]
Further, when the “ENG” mode is set, the exponent part of the numerical data displayed on the character display part 11 in the center of the liquid crystal display part 10 is displayed in engineering units on the right dot display part 13 of the liquid crystal display part 10. , The numerical value can be displayed according to the engineering calculation formula.
[0057]
Even when the numerical data and its exponent engineering unit are displayed in the “ENG” mode, if the binomial function for the currently displayed numerical data is keyed in, the display of the exponent engineering unit is stopped. On the right-side dot display section 13 of the liquid crystal display section 10, the key-input binomial function is switched and displayed, so that the key input display according to the mathematical procedure can be performed even in the engineering unit display mode.
[0058]
【The invention's effect】
According to the present invention, numerical data of a calculation formula input by a key is displayed by a numeric display provided at the center of the display device, and a prefix function and a binomial function of the calculation formula are respectively included in the display device. Since the characters are displayed by the character display bodies provided on both the left and right sides, the calculation formulas inputted by the keys can be sequentially displayed without forming the display device with the entire character display body.
Further, it is possible to set a display mode of the engineering unit, and to control the engineering unit according to the numerical data on the character display on the right side of the display device in the setting state of the engineering mode.
Further, in the setting mode of the engineering mode, when the binomial function for the numerical data displayed on the display device is input by a key, the display of the engineering unit by the unit display means is stopped, and the key input is performed instead of this display. The displayed binomial function can be controlled to be displayed on a character display on the right side of the display device.
[Brief description of the drawings]
FIG. 1 is a plan view showing a configuration of a liquid crystal display unit of an electronic computer according to an embodiment of the present invention.
FIG. 2 is a block diagram showing a configuration of an electronic circuit of the electronic computer.
FIG. 3 is a flowchart showing a calculation process by the electronic computer.
FIG. 4 is a flowchart showing a display process accompanying the calculation process of the electronic computer.
FIG. 5 is a view showing an input operation of a calculation expression including a prefix function operation by the electronic computer and a display operation thereof.
FIG. 6 is a diagram showing an input operation of a calculation formula in an “ENG” (engineering) mode by the electronic calculator and a display operation thereof.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Liquid crystal display part, 11 ... Character display part, 12 ... Left dot display part, 13 ... Right dot display part, 14 ... Exponent display part, 15 ... Mode display part, 21 ... Central processing unit (CPU), 22 ... key input unit, 23 ... ROM, 24 ... RAM, 24a ... key buffer, 24b ... operation register, 24c ... operator stack register, 24d ... data stack register, 25 ... display RAM.

Claims (3)

A display device having a numeric display in the center and a character display on both the left and right sides,
Key input means having a function key including a prefix function, a binomial function, and a numerical key;
Display control means for displaying the numerical data key-input by the key input means on the numeric display of the display device, displaying the prefix function on the left character display, and displaying the binomial function on the right character display,
Engineering mode setting means for setting a display mode of the engineering unit;
In a setting state of the engineering mode, a unit display control unit that controls to display an engineering unit corresponding to numerical data on a character display body on the right side of the display device,
In the setting state of the engineering mode, when a binomial function with respect to the numerical data displayed on the display device is inputted by a key, the display of the engineering unit by the unit display means is stopped, and the display is replaced with the key. Display switching means for controlling the input binomial function to be displayed on a character display on the right side of the display device;
An electronic calculator comprising: The display control means further comprises means for clearing numerical data displayed on a numeric display of the display device immediately before a prefix function is input by the key input means. Electronic computer according to 1. 3. The electronic type according to claim 1, wherein the numeral display is configured by a plurality of character-shaped display units, and the character display unit is configured by a dot matrix display unit. 4. calculator.

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