JPS609879Y2 - Electronic devices with clocks and calculators - Google Patents

Description

[Detailed description of the invention] This invention is a clock and
The present invention relates to an electronic device with a watch/calculator, in which power for the electronic device section is supplied to the calculator section via a power changeover switch, thereby extending the life of the power source for the watch.

Generally, in electronic devices such as radio receivers and tape recorders that are equipped with a clock section and a calculator section, the clock section and the calculator section are constructed from the same large-scale integrated circuit. A method is used in which power is supplied from the same battery.

Therefore, the lifespan of the battery is determined more by the state of use of the calculator than by the driving of the clock, and the battery wears out more rapidly and has a shorter lifespan than if it were used only to drive the clock.

This is inconvenient for a timepiece that needs to be driven all the time.

This invention takes into consideration the drawbacks of the conventional methods, and when the calculator is in use, the power from the electronic equipment section is supplied to the calculator section using a power selector switch.
Embodiments will be described in detail with reference to drawings showing examples.

In the figure, EM is an electronic equipment section such as a reception system circuit of a radio receiver or television receiver or a recording/reproducing circuit of a tape recorder, and CLK and EC are clock sections configured in the same large-scale integrated circuit 6. and the calculator section, B1 is a first power supply for the electronic device section in which, for example, two 1.5V batteries are connected in series, and the negative electrode side is connected to the negative power terminal (-) of the electronic device section EM. .

SWl is a power supply changeover switch in which the common terminal COM is connected to the positive terminal side of the first power supply B1, and the contact em for the equipment section is connected to the positive side power terminal (+) of the electronic equipment section EM, and the switch for the clock section Contact clk is in an open state.

R is a step-down resistor of the first power supply B1 connected to the calculator contact eC of the power supply changeover switch sw1, Dl is a first diode whose anode is connected to the step-down resistor R, and its cathode is connected to the calculator contact C. It is connected to the display switching/power supply terminal A.

B2 is a second power supply consisting of, for example, a 1.5V battery, and both ends thereof are the power supply terminals (+) of the large-scale integrated circuit LSI,
(-), and the negative electrode side is connected to the negative electrode side of the first power source B1, and constantly drives the clock portion CLK.

sw2 is a display changeover/power changeover switch in which the common terminal COM is connected to the positive side of the second power supply terminal B2, and it operates in conjunction with the power changeover switch sw1, and the calculator part contact e
C is connected to the calculator section EC via the second diode D2 in the forward direction.
The clock section peripheral terminal 1k is connected to the display switching terminal B of the clock section CLK, and the equipment section contact em is in an open state.

C is a control unit that controls the electronic equipment unit M to operate the sleeve or alarm by the sleeve signal or alarm signal output from the clock unit CLK, and D ISP is a control unit that operates the sleeve or alarm by the sleeve signal or alarm signal output from the clock unit CLK. This is the liquid crystal display section that displays the image.

Next, the operation of the above embodiment will be explained.

In a normal state, both selector switches sw1.
The common terminal COM of sw2 is connected to the clock part contact clk, and the second power supply B2 drives the clock part CLK, and the second power supply B2 drives the display changeover switch SW2.
The output signal of the clock CLK is input to the liquid crystal display @[EISP, and the time is displayed.

Then, both selector switches sw1. common terminal CO of sw2
When M is connected to the device contact point em, the first power source B1 is connected to the electronic device section EM via the power changeover switch SW1, and the electronic device section EM is driven.

Next, both changeover switches sw1. common terminal CO of sw2
When M is connected to the calculator contact eC, the voltage of the first power supply B1 is stepped down to a voltage slightly higher than the voltage of the second power supply B2 by the step-down resistor R via the power supply selector switch SW1, and then the calculator section It is applied to the display switching and power supply terminal A of the EC.

Therefore, the calculator C is driven by the first power source B1, and the driving details of the calculator EC are displayed on the display section DISP.

Therefore, the second power source B2 is used exclusively for the watch section, and it can have a long life with less wear and tear.

Incidentally, when the first power supply B1 is exhausted and the voltage stepped down by the step-down resistor R becomes lower than the voltage of the second power supply B2, the voltage of the second power supply B2 is changed to the display switching and power supply changeover switch S.
The signal is supplied to the calculator section EC via W2 and the second diode D2.

As described above, according to the electronic device with a clock/calculator of this invention, the first power source for the electronic device section is connected to the common terminal of the power selector switch, and the device section contact of the power selector switch is connected to the electronic device section. At the same time, connect the calculator contact of the power selector switch to the calculator section, connect the second power supply for the clock section to the clock section, and connect the power of the first power source to the electronic equipment section and the calculator using the power selector switch. By supplying power to the second power source for the watch, consumption of the second power source for the watch can be reduced and its lifespan can be significantly extended.In addition, there is no need to provide a separate power source for the calculator, and a separate power source for the electronic devices can be provided. Since the power supply for electronic devices is shared without being installed, the device does not become larger.

[Brief explanation of the drawing]

The drawing is a block diagram of one embodiment of the electronic device with a clock and calculator of this invention. B1...First power supply, B2...Second power supply, swl...Power supply selector switch, COM.
...Common terminal, clk...Contact for watch section, em...Contact for device section, ec...Contact for calculator section, CLK...・Clock Department, EC...
...Calculator Department, EM...Electronic Equipment Department.

Claims (1)

[Scope of utility model registration request] A first power supply for the electronic equipment section is connected to a common terminal of the power supply changeover switch, a contact for the equipment part of the power supply changeover switch is connected to the electronic equipment part, and a first power supply for the calculator of the power supply changeover switch is connected to the common terminal of the power supply changeover switch. A second power source for the clock section is connected to the calculator section via a diode, and a second power source for the clock section is connected to the clock section, and also connected to a common terminal of the display selection/power selection switch, and the calculator contact of the display selection/power selection switch is connected to the calculator section through a diode. is connected to the calculator section via a second diode, and power is normally supplied to the calculator section from the first power supply via the power supply changeover switch and the first diode. Electronic equipment with.