JPS628220A - Recording type electronic calculator - Google Patents

Abstract

PURPOSE:To allow an electronic calculator to have calculating functions at any time although it is a recording type by providing a normal battery and a solar battery, and switching the normal battery to the solar battery and inhibiting its printer from being used when the voltage of the normal battery drops. CONSTITUTION:A printer switch 3 is normally placed at a printing side and then an LSI switch 4 is also placed at a printing side associatively. A signal inputted from a keyboard 8 is calculated by an LSI 5 and displayed on a displayer 6, and also printed out on the printer 7 as necessary. When the normal battery 2 runs down and its voltage drops below a reference value, the LSI 5 detects that and 'switch changeover' is displayed on the displayer 6 with a display signal. When an operator changes the printer switch 3 to a display side, the LSI switch 4 is placed on a display side associatively. Consequently, the power source is switched to the solar battery and the LSI 5 detects that to stop the operation of the printer 7.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a recording type electronic desktop calculator with a printer.

BACKGROUND OF THE INVENTION FIG. 2 is a block diagram of a conventional recordable electronic desktop calculator (hereinafter referred to as a recordable calculator). In FIG. 2, voltage is constantly supplied from a battery 2 to an LSI (large scale integrated circuit) 5 and a printer device.

The LSI 5 performs calculations based on signals input from the keyboard 8, displays the input and results on the display 6, and prints the contents displayed on the display 6 using the printer 7 according to instructions from the keyboard 8.

Problems to be Solved by the Invention However, in the conventional technology, when the battery becomes exhausted, the printer device and the display become incapable of displaying information, and the calculator cannot function as a calculator. Normal calculators usually do not have an indicator to show the battery life. A.C.
Even in the case of a power-powered calculator, there are often no power outlets available where the calculator is used.

The present invention provides an excellent recording type electronic system that allows calculation functions to be performed at least through the display and the display on the device even if the printer device becomes unusable due to a decrease in the power supply capacity of the battery, thereby ensuring the calculation function at all times. The purpose is to provide a desktop calculator.

Means for Solving the Problems The present invention provides a solar cell in addition to a battery or commercial power source, which is considered to be a conventional power source, to enable switching between the two power sources. This is achieved by switching the power supply of the LSI, which is an arithmetic element, to the solar cell side.With the above configuration, the present invention allows the display to be used by the function of the solar cell even when the normal battery cannot be used. Only the calculations that will be performed can be performed.

Embodiment FIG. 1 is a block diagram of a recording type electronic desktop calculator according to an embodiment of the present invention. In Figure 1, 1 is a solar battery that is charged by solar energy, 2 is a normal battery such as a dry battery or a commercial power source, and 3 is a printing switch that switches between solar battery 1 (for display) and battery 2 (for printing). The common terminal of this printer switch 3 is LSI
It is connected to the power terminal of 5. 4 is an LS that switches between display tense and print tense in conjunction with printer switch 3.
This LSI switch 4 informs the LSI 5 whether the current mode is display tense or print tense, using a signal from a common terminal.

The LSI 5 is enabled to operate by the voltage of the print switch 3, calculates by inputting from the keyboard 8, and sends the result to the display 6 as a display signal. Further, when the switch 3.4 is set to the display tense, the LSI 5 stops the operation of the printer device 7 using the printer control signal 9, so as not to consume power. Note that the printer device 7 consumes more power supply current than the solar battery 1 can cover.

Next, the operation of the present invention will be explained. In Figure 1,
Normally, when the printer switch 3 is set to print tense, the LSI switch 4 is also set to print tense. Signals input from the keyboard 8 are calculated by the LSI 5, displayed on the display 6, and printed by the printer 7 if necessary.

When the power supply voltage from the normal battery 2 disappears due to exhaustion or becomes lower than the reference value, the LSI 5 detects this and displays "switch change" on the display 6 via a display signal.

When the printer switch 3 is switched to the display tense by the operator, the LSI switch 4 is also switched to the display tense. When the LSI 5 detects that the LSI switch 4 has been switched during display, the display signal "switch switching" is activated.
, and the operation of the printer device 7 is stopped by the printer control signal 9, thereby reducing current consumption. In this manner, when the solar cell 1 is in use, the operation of the printer device 7 is stopped and only the display 6 is displayed, thereby functioning as an electronic desktop calculator.

Effects of the Invention As is clear from the above embodiments, the present invention provides a solar cell in addition to the normal battery to enable switching between the two power sources, and when the voltage of the normal battery decreases, the power source is switched to the solar cell side. Since the use of a printing device is prohibited and the calculation result of the signal input from the keyboard is displayed only on the display, it has the effect that only the calculation function is always ensured even if it is a recording type.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a recording type electronic desktop calculator according to an embodiment of the present invention, and FIG. 2 is a block diagram of a conventional recording type electronic desk calculator. 1...Solar cell, 2...Normal battery, 3
...Printer switch, 4...LS
I switch, 5... Control means (LS rL
6... Display unit, 7... Printer device,
8...Keyboard, 9...Printer control signal.

Claims (1)

[Claims] A solar cell that self-charges with solar energy, a normal battery that supplies DC power from either a commercial power source or a dry battery, and a printer switch that supplies voltage from either the solar cell or the normal battery; The LSI switch works in conjunction with the printer switch to indicate whether the device is on the solar cell side or the normal battery side, and receives voltage from the normal battery, and allows printing to be enabled or inhibited by printer control signals. The printer device to be switched is supplied with power from the printer switch, and the LS
Based on the signal from the I switch, it is determined whether the printer switch is on the normal voltage side or the solar cell side, and if it is on the normal voltage side, a predetermined calculation is performed based on the signal input from the keyboard. and displays the results on a display, and a control means that enables the printer device to print, and in the case of the solar cell side, stops the printer device from printing based on the printer control signal. Electronic desktop calculator.