JPS60669Y2 - power control device - Google Patents

Description

[Detailed Description of the Invention] The present invention is an electronic desktop calculator (hereinafter referred to as a calculator with a Kilby meter) that has a distance measurement function.

) related to power supply control devices.

Conventionally, calculators with Kilby meters have a method in which when the switch is on, power is supplied to the detection circuit to operate the device as a distance measurement function, and when the switch is off, the above function is canceled and the device functions only as a calculator. is proposed.

However, according to this method, the switch must be pressed constantly, and the direction of movement changes from side to side or up and down, especially when measuring a curved line such as with a calculator with a Kilby meter, so the switch cannot be removed. There is a very high possibility that the device will separate from the device, which has the disadvantage of causing measurement errors and other operational errors.

Another method is to press the key once to keep it in the on state, and press it again to turn it off. In this case, when switching from length measurement mode to calculator mode, this key is The problem is that I forget to turn it off.

In other words, in the length measurement mode, power is constantly supplied to the driver and detection circuit, so the power consumed by these circuits is extremely large at 5 to 20mA.In the calculator mode, these circuits are not required, so the calculator Operating these circuits in this mode had the disadvantage of necessarily increasing power consumption.

Particularly in the case of battery-powered devices, this power consumption is a serious problem as it continues with battery consumption. □When switching from length measurement mode to calculator mode, it is recommended to automatically shut off the above circuit from the power supply as a power-saving measure. It was absolutely necessary.

The power consumption (5 to 20 mA) in the above-mentioned detection circuit and the like is 100 times as much power as that of the calculator's arithmetic control section (50 μA).

This invention was made to eliminate the drawbacks mentioned above.
In particular, it is an object of the present invention to provide a power supply control device for a calculator with a Kilby meter that prevents conventional measurement errors and also takes into consideration power saving measures.

An example of a calculator with a Kilby meter that employs a power supply control device according to the present invention will be described below with reference to the drawings.

Figure 1 is a schematic cross-sectional view of a calculator with a Kilby meter. 1 is a contact roller that rotates as the main body moves over a straight line, curve, or object to be measured, and 2 is a gear coaxial with this roller. , the rotation of the rollers is controlled by gear 2. 3. 4
and is transmitted to the rotating pulse plate 5, which generates pulses depending on the rotational state of a roller coaxial with the gear.

A detection device 6 detects the pulse output of the rotating pulse plate.

When the switch 7 is pressed, the control circuit 8 is activated.
Power is supplied from the power source 9 to the detection device 6 via the driver 16.

Even when the switch 7 is released, the detection device 6 is not turned off immediately, and a certain set predetermined time T (for example, 308? is selected in the embodiment).

), the device 6 is kept in the on state.

10 is a display device that digitally displays the measured values detected by the detection device 6, and 11 is a housing that accommodates these components.

Next, the specific circuit configuration of this device will be shown.

FIG. 2 shows a circuit block diagram of the same device. In this device, when the length measurement switch 7 is on, power is supplied from the power supply 9 to the detection device 6 via the driver 16, and the switch 7
Even if the detector 6 is turned off, for a predetermined period of time (e.g. 300 m), the same effect as if power was supplied from the power supply 9 is obtained. When the direction changes from left to right or up and down,
The structure is such that the user's hands are removed from the switch to prevent erroneous operation during measurement.

In other words, even if the switch 7 is removed, the detection device 6 immediately
Rather than cutting off the power supply to the detection device 0, for example, the power supply to the detection device 0 is maintained for a predetermined period of 30 minutes.

Therefore, even if the operator takes his hand off the switch, if he presses the switch 7 again within 3 seconds, there will be no erroneous operation in measurement.

This block circuit is constructed as follows.

That is, when the switch 7 is currently in the OFF state, the driver control circuit 15 is in an inactive state, and the power supply circuit supplied to the detection device 6 is connected to the driver 16 (transistor or IC).
Since the circuit (circuit) is in a cut-off state, the input signal of the counter 12 is not recurrent when the voltage VDD is applied, regardless of the operation of the contact roller (see FIG. 1).

At this time, an input signal from an external hole key (not shown) is applied to the arithmetic control circuit 13 as a so-called computer mode.
This circuit works, the calculation result is transferred to the display buffer 14, and the contents are displayed on the display device 10.

Conversely, when the switch 7 is turned on, the driver control circuit 15 is activated, the driver 16 is turned on, power is supplied to the detection device 6 from the power source 9, and a pulse is generated in response to the movement of the contact roller 1. , this number of pulses is counted by the counter 12, this counted value is transferred to the display buffer 14 via the arithmetic control circuit 13, and the length measurement result is displayed on the display device 10.

The driver control circuit 15 described above is configured as shown in FIG.
The detection device 6 is activated via the .

FIG. 4 shows a waveform diagram of each part of FIG. 3.

While the switch 7 is pressed, the input signal A represented by its input waveform is input to the OR gate 18, and the signal A is delayed by a preset time T in the delay circuit 17, and the input signal A is input to the OR gate 18.
The output waveform is as follows, and this signal B is the other input signal of the OR gate 18.

Therefore, even if the switch 7 is actually released and turned off, the output of the OR gate 18 remains on for the set time T, and the driver 16 remains on for the period indicated by the signal C.
Power can be supplied to the detection device 6.

A calculator with a killby meter using such a power supply control device can be moved up or down on a curve as shown in Fig. 5, and when measuring while holding down the switch 7, it can be moved not only up and down but also left and right. The direction changes in the direction, but even if the finger is removed during measurement, the above time T (for example, type 3)
You can obtain the same effect as pressing , and solve the problem of erroneous operation or difficulty in measuring.

If the switch is a fixed type such as a slide switch, the above problem will be solved, but if the switch is not turned on each time when changing from length measurement mode to computer mode, the power consumption of the detection device will be large and the power supply will be insufficient. When using batteries, their lifespan is a problem, but with the device of the present invention, these problems can be eliminated.

As explained above, according to the present invention, after switching the mode designation switch of an electronic desktop calculator having a distance measurement function from distance measurement mode to calculator mode, power is supplied from the power supply to the distance pulse detection circuit for a predetermined period of time to measure distance. Since a holding circuit is provided that maintains its function, it is possible to eliminate erroneous switch operations when measuring curves, etc., and reduce power consumption.

[Brief explanation of the drawing]

Fig. 1 is a schematic sectional view of an electronic desk calculator with a Kilby meter equipped with the power supply control device of the present invention, Fig. 2 is a block diagram of the same device, and Fig. 3 is the configuration of the driver control circuit in the block diagram of Fig. 2. 4 is a waveform diagram of each part of the circuit shown in FIG. 3, and FIG. 5 is a diagram showing an example of use of the same computer. In the figure, 1: contact roller, 2 to 4: gear, 5: rotating pulse plate, 6: detection device, 7: switch, 8: control circuit, 9
: power supply, 10: display device, 11: housing, 12: counter, 13: arithmetic control circuit, 14: display buffer, 15 driver/control circuit, 16: driver, 17: delay circuit, 18 Nior gate.

Claims (1)

[Scope of utility model registration request] In the electronic desktop calculator with a distance measurement function, the electronic desktop calculator has a power supply, a distance pulse detection circuit, and a mode designation switch inserted between the power supply and the distance pulse detection circuit for switching between a distance measurement mode and a calculator mode. Distance measurement characterized in that a holding circuit is provided for maintaining the distance measurement function by supplying power from the power source to the distance pulse detection circuit for a predetermined period of time after switching the name code designation switch from distance measurement mode to calculator mode. A power control device for an electronic desktop calculator with functions.