JPS5916307B2 - Electronic computer control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a control system that cuts off the power supply current supplied to each part of a computer when a key on a keyboard is pressed and the next key is not pressed within a certain period of time. The present invention relates to a control device that performs the following operations.

Among electronic computers, small ones that are powered by batteries,
Leaving a watch in an operating state for a long time even when it is not needed is disadvantageous in terms of battery life, and excessive battery consumption is a serious problem, especially for ultra-small devices built into electronic wristwatches. It is. An object of the present invention is to provide an improved control system that prevents unnecessary battery consumption by suspending the functionality of a computer if the next key is not pressed within a certain period of time after a key is pressed. The purpose is to provide equipment. In the typical usage pattern of electronic computers, while performing the necessary calculations, keys on the keyboard are usually pressed at intervals of several seconds, up to one minute, and there are intervals of more than one minute. In this case, it is safe to assume that the calculation has been completed.

Therefore, keeping the various parts, especially the display device, which consumes a large amount of power, in an operating state for a longer period of time will only cause unnecessary battery consumption. Although it is desirable to turn off the power switch immediately after completing the necessary calculations, this operation is cumbersome and is not always carried out. Therefore, if the next key operation is not performed after a series of key operations, the power will be turned off.
The control device of the present invention prevents unnecessary battery consumption and at the same time relieves the operator from turning on and off the power switch. Next, one embodiment of the present invention will be described with reference to the drawings.

The keyboard indicated by reference numeral 1 in FIG. 1 is composed of a key holding plate 3 holding a large number of keys 2, a conductive rubber plate 4, and a printed board 5. The printed board 5 has a series of mutually parallel conductors 5a on its front surface, and a series of mutually parallel conductors 5b that are perpendicular to the conductors 5a on its back surface, and a part of the conductors 5b is connected to each conductor 5a. exposed on the surface at the intersection of Further, the conductive rubber plate 4 has a bulge portion 4a at a position corresponding to each key 2. This bulging portion 4a does not normally come into contact with both conductors 5a and 5b at the same time, but when it is pressed toward the printed board 5 via the key 2, it deforms and connects with one conductor 5a. One conductor 5b is electrically connected to each other. Each conductor 5a
and 5b are connected to a known decoder circuit, and it is determined which key 2 has been pressed based on the combination of a set of interconnected conductors 5a and 5b. The output of the decoder circuit is sent to an arithmetic circuit and used to perform a predetermined arithmetic operation, and the obtained arithmetic result is displayed on a display device. Since these configurations and functions are similar to those of a general electronic computer, detailed explanation thereof will be omitted. As is clear from the above explanation, when any key 2 is pressed, the conductive rubber 4 is partially connected to the conductors 5a and 5.
It comes into contact with both b and its potential changes.
This change in potential is supplied to the reset input of the flip-flop 12 via the 0R circuit 11 shown in FIG. 2 as a key input signal indicating that the key 2 has been pressed. As a result, the level of the Q output of the flip-flop 12 becomes "H", and this "H" level control signal supplies drive current to each part of the electronic computer to enter the state of starting calculation operation. The reason why two input terminals to which key input signals are supplied is shown in FIG. 2 is to take into consideration the case where the conductive rubber plate 1 is divided into multiple parts. If it is made up of a single part, there is only one key input signal, so only one input terminal is required, and the 0R gate 11 can also be omitted.
The output is supplied to one input terminal of AND gate 13.

A timing pulse having a constant frequency is supplied to the other input terminal of this AND gate 13, and this timing pulse passes through the AND gate 3 only while the level of the Q output of the flip-flop 12 is [H]. counter 14
The count is supplied by human power. The counter 14 counts the supplied timing pulses, and when the count reaches a set value, it functions as a timer circuit that supplies a pulse from the decoder 15 to the set input of the flip-flop 12. Further, the counter 14 is reset each time the next key input signal is supplied to the reset input. Now, when a key input signal is given by pressing one of the keys 2, the flip-flop 12 is immediately reset, a control signal is generated, and at the same time a timing pulse is supplied to the counter 13 via the AND gate 13. .

If the next key input signal is not supplied here, the count of the counter 14 progresses, and when the set count is reached, the flip-flop 12 is reset and the level of the control signal goes to "L". Become. In other words, an operation is obtained in which the level of the control signal becomes "-H" only for a certain period of time after one key input signal is supplied.Then, the count number of the cull counter 14 does not reach the set value. When the next key input signal is supplied, the counter 14 is reset by this signal, so the counter 14 starts counting from the beginning.If the frequency of the timing pulse is constant, the counter 14 The time from starting counting to reaching the set number is also constant, so the above explanation applies only if the next key 2 is not pressed within a certain amount of time after one key 2 is pressed. It can be said that the operation stops automatically.

If the next key 2 is pressed within the set time,
This set time will be updated. As the timing pulse, in the case of an ordinary type of electronic computer, one used for synchronizing each internal circuit can be used. In addition, in the case of a type that is integrated into an electronic wristwatch, a clock signal for clock operation can be used, or a signal extracted from a time display signal output terminal and decoded may be used. The latter case is particularly advantageous when a variety of systems are constructed using a plurality of independently constructed IC chips. As explained above, according to the present invention, the power is automatically turned off after a certain period of time after a series of key operations are completed.
It can be in the FF state.

Therefore, power consumption due to unnecessary continuous operation is eliminated, and battery life can be expected to be significantly extended, especially in devices powered by small batteries. In addition, this invention allows the Q output of FF12 for power OFF to be connected to the gate 13.
At the same time, the reset terminal of FFl2 is connected to the reset terminal of the counter 14, so while the key is pressed, even if the Q output of FFl2 turns gate 3 to 0N, the counter will not be activated. 14 Since the beam is in the set state,
The timer circuit consisting of counter 14 does not operate. This means that the timer circuit will start operating after there is no key input, which may cause inconveniences such as the power turning off when the key is locked and the display is displayed for a long time. There is no. Furthermore, in the present invention, the timing pulse of the counter 14 can be replaced with a clock having a very long time span such as seconds, minutes, hours, etc. of an electronic wristwatch, so the configuration of the frequency divider of the timer counter can be easily simplified. Effects such as being able to do this can be obtained.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view of the main parts of a keyboard applied to an electronic computer having a control device according to an embodiment of the present invention;
FIG. 2 is a block diagram showing the configuration of the control device. 1...Keyboard, 2...Key, 3.
...Key holding plate, 4... Conductive rubber plate, 4
a...Bulging part, 5...Printed board, 5
a, 5b...Conductor, 12...Flip-flop, 14...Counter, 15...
·decoder.

Claims (1)

[Claims] 1 A conductive rubber that connects conductors and generates a key input signal when pressed by a key on a keyboard, and a control signal that always maintains the reset state and turns on the power while receiving the key input signal. a gate circuit that passes a timing pulse consisting of a timing signal for clock operation of an electronic watch while receiving the control signal, and a reset state while receiving the key input signal, and the key input a timer counter that starts counting the timing pulses that have passed through the gate circuit as soon as the signal disappears; and after a certain period of time when the timer counter reaches a set count, the flip-flop is inverted to a set state and the control signal is cut off. A control device for an electronic computer, comprising a decoder that turns off the power.