JPS6223906B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to electronic equipment powered by a battery as a power source.

[Prior Art] Among recent journal printers, there are also small printers that can be powered by batteries with very low power consumption. If you use this printer to configure a hand-held calculator that uses batteries as a power source, the battery capacity will drop during office calculations or calculation processing of a large amount of data, and printing will become impossible. In this case, conventionally, you would write down the intermediate results of the previous calculations shown on the display and the contents of the memory on a separate piece of paper, then turn off the power and replace the battery with a new one. After that, I turned on the power, entered the intermediate results and memory contents I had previously written down into the calculator from the keyboard, and continued the remaining calculations.

[Problems to be Solved by the Invention] However, this method is extremely troublesome and is prone to errors when transcribing intermediate calculation results or memory contents to a separate sheet, and errors when inputting the transcribed data using the keyboard. This was both inconvenient and inefficient.

[Means for Solving the Problem] In order to solve this problem, the present invention provides a holding means for maintaining the function of the electronic circuit even if the power supply from the battery is cut off, and a means for removing the battery. It is provided with a switch means mechanically interlocked with the operation, and an input prohibition means for prohibiting data input from the data input means to the electronic circuit when the switch means is operated in interlock with the operation of removing the battery.

[Function] When the battery, which is the power source, is removed, a mechanically linked switch is activated and data input is prohibited.

[Example] This will be explained below with reference to the drawings.

FIG. 1 is a block diagram of one embodiment for implementing the present invention.

Section K in Figure 1 is a group of keys (□1□2...□9□・□＋
□−…
□×□=etc) and a switch that prohibits key input
This is a keyboard section with KS.

AND gates G1 and G2 are gates for passing or inhibiting key input signals.

Section A is a calculation section composed of C-MOS, which stores calculation data, memory, calculation status, etc., and performs other controls.

Section D is a liquid crystal display, and is a display section for displaying calculation results and numerical values of memory contents based on signals from calculation section A.

The P unit is a printing unit that prints calculation data and memory contents on printing paper under control from the calculation unit A.

B is a dry battery for driving the K, G1, G2, A, D, and P sections. PS is the power switch.

C is a capacitor that stores the charge supplied from battery B when the power switch is turned on. R is a resistor for rapidly discharging the charge accumulated in the capacitor C when the power switch is turned off.

Now, as shown in the figure, when the power switch PS is ON, the capacitor C is charged by the current from the battery B, and current is also supplied to the K, G1, G2, A, D, and P sections, and normal calculation operation is performed. can be started. The capacitance of the capacitor C is set to a value that allows the K, G1, G2, A, and D sections to operate for several minutes due to the accumulated charge. Power switch SP
Even if battery B is removed for replacement while it is on, charge is supplied from capacitor C to calculation unit A for several minutes, and calculation data, memory contents, and calculation status are retained. Next, when battery B is inserted within a few minutes, the original state is restored and calculation continues. When the calculation process is completed and the power switch is turned off, I want to immediately stop the type wheel in the printing section and other parts of the computer. For this purpose, the power switch PS has a two-contact structure, and when it is OFF, a resistor R is connected in parallel to the capacitor C.
is connected, the charge stored in the capacitor C is quickly discharged by the resistor R, and the calculator stops quickly. The switch KS to prohibit key input when the battery is removed is turned OFF.
In this case, the AND gates G1 and G2 are open, so key signals such as 0, 1, 5, +, -, and x are read into the arithmetic unit A through the gates G1 and G2 and executed. When KS is ON, the gates G1 and G2 are closed, so even if the respective keys are pressed, the data is prohibited by the gates G1 and G2, so that the signal is not supplied to the calculation unit A and is not executed. Although this switch KS is a manual switch that is set when the battery is removed, it is also convenient as an automatic switch that is linked to the battery installation and removal as shown in Figures 2 and 3.

Figure 2 shows the normal usage condition, where the key input signal automatic inhibition switch KS' is set to the dry battery pack BP.
It is in the OFF state when pressed in, and key input signals are not prohibited as described above.

Figure 3 shows the dry battery pack for replacing the dry batteries.
In the state when the BP is pulled out, the switch KS' is pulled by the spring V and turns ON, and the key input signal is automatically inhibited when the battery pack BP is removed. The printing example of A in Figure 4 is 123+45+...35=238+
This is a case where the battery capacity has decreased by the time the battery is calculated and the battery is replaced. Before replacing the battery, the intermediate calculation results 1154 up to that point are read from the display section D and transcribed on a separate sheet. When the power is turned on again after being turned off once, O/C is usually printed as shown in the figure.
After that, the intermediate calculation result 1154 that had been transcribed is input from the keyboard part KB, and the remaining calculations 24+34+ are performed to obtain a total of 1212.

As a result, four lines of paper are wasted on the PA, additional memo paper is required for transcription, and it is also necessary to re-enter intermediate results from the keyboard.

In printing example B according to the present invention, the battery was replaced after 238+, but since the intermediate calculation result is retained even when the battery is replaced, it is possible to execute the remaining calculation 24+34+ and obtain the calculation result after replacing the battery. It is possible.

[Effects] As described above, according to the present invention, with a simple configuration, the state of the electronic device can be maintained even when the power supply battery is replaced, and erroneous input of unnecessary data can be prevented.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of the present invention, K...Keyboard section, KS...Key input signal prohibition switch, G1, G2...AND gate, D...
...Display section, A...Calculation section, P...Printing section, C...
Capacitor, PS...power switch, B...dry power supply, R...resistor Figures 2 and 3 show an example for automatically operating the switch KS', BP...dry battery pack, V...Spring, PA...Roll paper FIGS. 4A and 4B are diagrams showing a conventional printing example and a printing example of the present invention.

Claims (1)

[Claims] 1. An electronic circuit driven by power from a battery; a data input means for inputting data to the electronic circuit; a holding means for retaining the function of the electronic circuit; a switch means mechanically interlocked with the battery removal operation; and when the switch means operates in conjunction with the battery removal operation, the data input means and an input prohibiting means for prohibiting data input to the electronic circuit, and inhibiting input of data from the data input means while maintaining the function of the electronic circuit when the battery is replaced. A battery-powered electronic device featuring: