JPS6220026Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Technical Field> The present invention relates to an electronic desktop calculator having a plurality of modes, and particularly to a display device that displays modes by switching between the modes.

<Prior art> Conventionally, in electronic desktop calculators that display modes by switching modes, when displaying the mode,
A mode display means was provided separately from the display device to display the switched mode.

<Purpose of the invention> The present invention displays the mode using a display device for displaying numerical values or formulas without separately providing the above mode display means.When switching modes, the display device displays the current mode, and the key The above display is maintained until input is made. Also,
In this case, the mode is displayed on the display device until a key is input, and other modes can be displayed at the same time.

<Example> The present invention will be described in detail below with reference to the drawings. FIG. 1 is a plan view showing the external appearance of the electronic desk calculator of the present invention, and FIG. 2 is a block diagram showing an embodiment of the circuit configuration of the present invention.

First, in Figure 1, □0 to □9 are number keys for inputting numerical information, □・ is a decimal point key, □+□-□×□÷ is a function key for four arithmetic operations, and □= is the end of inputting an expression. is the input key, SIN COS TAN is the function key,
DRG is the unit of angle for trigonometric functions (DEGREE,
RADIAN, GRADIAN) key, DATA
is the key for inputting data in statistical calculations, ΣX
SX is the statistical quantity (total sum of data, standard deviation,
key to view the average value of the data), COMP is the key to execute the stored algebraic formula, code 1 is the numerical information,
A display device that displays formulas, calculation results, etc., and modes;
2 is a mode changeover switch for selecting a mode. The AER mode of this mode selector switch 2 is a mode in which algebraic expressions are input into the expression storage circuit and stored.
COMP mode is a mode for executing calculations on stored algebraic expressions, and STAT mode is a mode for performing statistical calculations.

Next, in FIG. 2, 1 is the display device explained in FIG. 1, 2 is a mode changeover switch, and 3, 4, and 5 are mode display signal generators,
Generates signals with the characters MODE, COMP MODE, and STAT MODE. The signal from the mode display signal generator is input to the detection circuit 6 via the mode changeover switch 2. The detection circuit 6 also inputs key signals from the key input device 7 for each key explained in FIG. When the key signal is input, the output becomes "0". still,
The output is a display signal from the mode display signal generator.

The key input device 7 sends its key input signal to the control section 8. The control unit 8 stores the algebraic formula input from the key input device 7 in the formula storage circuit 9 while the mode selector switch 2 is in the AER mode.
and remember it. Further, the control unit 8 executes calculations of algebraic expressions in the expression storage circuit 9 in response to input signals from the key input device 7.

Reference numeral 10 denotes a display signal generating section for inputting key inputs from the key input device 7 and calculation results from the equation storage circuit 9 via the control section 8 and displaying numerical values, equations, etc. The display signal from the display signal generator 10 is input to the other input terminal of an AND gate G1, into which the output from the detection circuit 6 is input via an inverter, and the output of the AND gate G1 is input via an OR gate G3. and sent to the display buffer 11. That is, when the gate G1 is in the operating state, the display signal from the display signal generating section 10 is sent to the display buffer 11, and its contents are displayed on the display device 1.
In addition, the display buffer 11 has an AND gate G2.
By opening, a mode display signal is also sent, and the mode display signal output is applied to the other input terminal of the AND gate G2 to which the output from the detection circuit 6 is input. The output of gate G2 is OR gate G
3 to the display buffer 11.

Furthermore, reference numeral 12 is a key input device for the DRG key, the output of which is sent to an angle conversion circuit 13. The angle conversion circuit 13 receives the input of the DRG key,
It changes the unit of angle, and the display device 1
A signal for sequentially changing the display of DEG, RAD, and GRAD is sent to the display device 11, and a signal corresponding to the currently displayed angle is sent to the control unit 8. Each time the DRG key is pressed, the display on the display device 11 changes in the order DEG→RAD→GRAD, and a signal of the displayed angle unit is sent to the control unit 8.

The operation of the structure as described above will be explained below with reference to FIG. FIG. 3 shows the display state of the display device 1 according to the operation of each key shown in FIG.

First, when the mode selector switch 2 is switched to AER, the detection circuit 6 detects the switch, the output becomes "1", and the AND gate G2 becomes operational. Therefore, the signal from the mode display signal generator 3 is transmitted to the gates G2 and G3 from the output of the detection circuit 4.
is sent to the display buffer 11 via the display device 1.
“AER MODE” is displayed.

Next, when the SIN key is pressed, the detection circuit 6 detects the key input and sets the output to "0".
The above key input brings the AND gate G1 into operation. Therefore, the key input of SIN of the key input device 7 is inputted to the display signal generation section 10 via the control section 8, and sent as a display signal to the display buffer 11 via the gates G1 and G3. “SIN” is displayed. At this time, the mode display disappears, and the SIN key input is stored in the formula storage circuit 9. Here, by pressing the DRG key, the angle is
Assume that DEG is displayed.

Then, the keys are operated in the order of □3□0□=. In this key operation, as with the SIN key, each key input signal is input to the display signal generator 10, transferred to the display buffer 11 as a display signal, and stored in the expression storage circuit 9. At this time, "SIN30=" is displayed on the display device 1, and the same formula as the contents is also stored in the formula storage circuit 9.

In order to execute the calculation of the formula stored in the formula storage circuit 9 by the above-mentioned key operation, the mode changeover switch 2 is switched to COMP. As a result of this switching, the output of the detection circuit 6 becomes "1" and the display signal of the mode display signal generator 4 is transferred to the display buffer 11. Therefore, display device 1 is in “COMP MODE”
Display.

Then, when the next COMP key is pressed, the output of the detection circuit 6 becomes "0". At this time, the control unit 8
When the above-mentioned key is pressed, the calculation of the formula in the formula storage circuit 9 is executed, and the calculation result is sent to the display signal generation section 10. As a result, the display signal generator 1
The display signal from 0 is transferred to the display buffer 11, and the calculation result "0,5" is displayed on the display device 1.

Next, when the mode changeover switch 2 is switched to STAT mode, the display device 1
“STAT MODE” is displayed. Therefore, it is sufficient to input values for performing statistical calculations. That is,
By operating the keys □1DATA and □2DATA as shown in , the respective numerical values "1" and "2" are sequentially displayed on the display device 1.

Furthermore, when the mode selector switch 2 is switched to AER, the display device 1 displays "AER MODE".
Here, each time you press the DRG key, 〓DEG→RAD→
The single position of the angle of the trigonometric function changes in the order of GRAD〓. Therefore, by operating the DRG key, the angle conversion circuit 13 simultaneously changes the unit of angle.
A signal corresponding to the currently selected angular unit is supplied to the control section 8 from here. Further, a signal for displaying the currently selected angle unit is supplied to the display device 1 from here. Therefore, as shown in the figure, DRG
Each time the key is pressed, the angle display changes to “RAD”.
A signal in units of angle corresponding to the display is supplied to the control unit 8, changing in order as "GRAD". In the above-mentioned operation (see FIG. 3), the mode display and angle switching display that are displayed at the time of mode switching are performed at the same time, and according to the present invention, it is also possible to display a plurality of modes at the same time.

<Effect> As explained above, according to the present invention, the mode display by mode switching is displayed on the display device that displays numerical values, formulas, calculation results, etc., and this display is displayed until the key is input. Since the unit is displayed continuously and the unit is also displayed by switching the unit on the display device, and this display is always performed,
No separate display means is required for mode switching and unit switching, and it is clear from the display whether mode switching has been performed correctly and what unit is currently selected. be able to.

[Brief explanation of drawings]

Fig. 1 is a plan view showing the external appearance of the electronic desktop calculator of the present invention, Fig. 2 is a block diagram showing an embodiment of the circuit configuration of the invention, and Fig. 3 explains the function of the block diagram of Fig. 2. This is a diagram provided for the purpose of 1... Display device, 2... Mode changeover switch,
3, 4, 5...Mode display signal generation unit, 6...Detection circuit, 7...Key input device, 8...Control unit, 1
1... Display buffer.

Claims (1)

[Claims for Utility Model Registration] An input key for inputting numerical values, formulas, etc., a unit switching key for selecting a desired unit from a plurality of units, and a first mode for inputting and storing algebraic formulas; The second step which executes the operation of the algebraic expression
In an electronic calculator having modes, a mode changeover switch for selecting a desired mode from the above modes, an expression storage circuit for storing algebraic expressions input in the first mode, and operation of the mode changeover switch. a detection circuit that detects mode switching in response to the above, and when it is detected by the output of the detection circuit that the second mode has been selected, the above formula is stored in the unit selected by the operation of the unit change key. a control unit that executes calculations of algebraic formulas stored in the circuit; and a control unit that displays the selected mode on a display device that displays numerical values, formulas, calculation results, etc. based on the output of the detection circuit; The display of the above mode is maintained until a key is operated, and
A mode display device for an electronic desktop calculator, comprising display means for constantly displaying the unit selected by the operation of the unit switching key on the display device.