JPS63298090A - Electronic timepiece - Google Patents

Abstract

PURPOSE:To provide an additional function to display a current state without applying a load to a battery by providing a current measuring instrument into a driving circuit of a step motor. CONSTITUTION:Current flows to a driving coil 21 and a rotor 62 turns when a pulse is inputted to the driving circuit 15 via an inverter 10 and a NOR gate 14. The current for one pulse flowing to the coil 21 flows, thereafter, to an ammeter 23 connected to the circuit 15. A capacitor 22 is charged by this current. Then, the current flows to a coil 21 and the indicating pointer of a current consumption indicating mechanism oscillates according to the driving current. The additional function for indicating the driving current without applying the load to the battery is obtd. by this mechanism which does not require a gear mechanism, etc., interlocking to the rotor.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a clock that displays the current consumption value of a step motor every second using a pointer.

[Conventional technology]

In conventional watches, there is a method of detecting a drop in battery voltage and displaying the second hand in 2-second intervals to inform the user of the condition in which the watch is running. There has never been a watch that uses a pointer to display the amount of current consumed by a step motor while it is being driven, and that indicates the condition of the watch based on the amount of movement of the pointer.

[Problem that the invention seeks to solve]

As shown in FIG. 6, the step motor of a normal watch is composed of a yoke 61, a rotor 62, and a coil 66. Electric current is alternately applied to coil terminals 64 and 65 every second, causing the rotor 62 to reverse. The driving force was transmitted to other gears to display the time. In addition, if you try to provide a watch with an additional function that is also decorative, it is necessary to connect the rotor or other gears transmitted from the rotor with another gear for the additional function, and such a structure This places a load on the watch itself, increases current consumption, and shortens battery life.Therefore, in order to provide the watch with an additional function that also serves as a saturation function, a separate function separate from the clock display function is required. There was no choice but to add a new structure to the watch.An object of the present invention is to provide a watch with additional functions that prevents an increase in current consumption and also serves as a decoration.

[Means for solving problems]

In order to achieve the above object, the present invention has the following configuration.

A step motor for moving clock hands, an oscillation circuit, a frequency dividing circuit, a normal pulse forming circuit, a correction pulse forming circuit, a drive circuit for driving the step motor based on pulses from the normal pulse forming circuit, and the step. A control circuit includes a detection circuit that detects rotation or non-rotation of a rotor constituting a motor, and outputs a correction pulse from the correction pulse forming circuit to the drive circuit when the detection circuit detects non-rotation of the rotor. The electronic timepiece is characterized in that a current measuring device is connected within the current path of the driving circuit, and a pointer of the current measuring device is configured to display the state of the current flowing through the driving circuit.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a circuit block diagram of an electronic timepiece according to an embodiment of the present invention, FIG. 2 is an output waveform diagram of the circuit block diagram shown in FIG. 1, and FIG. 3 is a circuit block diagram of an electronic timepiece according to an embodiment of the present invention. Plan view,
4 and 5 are operational plan views of essential parts showing the power-off display section of FIG. 3. FIG.

In Figure 1, 1 is an oscillation circuit, 2 is a frequency dividing circuit, and 3 is a normal pulse forming circuit.
Outputs a pulse of s width every 1 second. 4 is a correction pulse forming circuit whose effective power value is higher than that of a normal pulse, as shown in Fig. 2 (b
) A pulse with a width of <12m5 is output every second.

5 is a coil opening/closing pulse forming circuit which outputs a series of thin pulses every second as shown in FIG. 2(C). Reference numeral 6 is a Torget type flip-frog C (hereinafter referred to as T-FF) whose output is normally inverted at the rising edge signal of the pulse forming circuit.

7 is two AND gates 7a, 7. b and OR gate 7C
The output is a gate group consisting of buffers 9 and N
It is input to the OR gate 16. Similar to gate group 7, 8 is also a gate group consisting of two AND gates 8a, 8b and an OR gate 8C, and its output is sent to buffer 10 and N
It is input to the OR gate 14.

Further, a coil opening/closing pulse is input to the NOR gate 13.14 via the AND gate 11.12. Reference numeral 15 denotes a drive circuit comprised of two P-channel MO8) transistors and two N-channel MOS transistors, to which the outputs of a buffer 9.10 and a NOR gate 16.14 are input, respectively. Current alternately flows through the drive coil 21 every second as shown by the arrows, causing the rotor 62 to reverse. Furthermore, inverters 16 and 17 are installed at both ends of the drive coil 210.
The outputs of the inverters 16 and 17 are inputted to one side of the AND gate 19 via the NAND gate 18 to form a rotation/non-rotation detection circuit for the rotor 62. AND
A signal from the coil opening/closing pulse forming circuit 5 is input to the other input of the gate 19. 20 is a set-reset flip-frog (hereinafter referred to as 5-RFP), the signal from the normal pulse forming circuit 3 is input to the set terminal, the output of the AND gate 19 is input to the reset terminal, and the Q output is the same as described above. are input to AND gates 7b and 8b constituting a gate group 7.8, respectively. Further, an ammeter 26 which is a current measuring device is connected to the current path of the drive circuit 15, and the current from the drive circuit 15 is measured by the ammeter 26.
The current flows through the coil 25 (.The ammeter 26 is generally composed of a coil 25 and a magnet 24, but in this embodiment, a capacitor 22 is connected to the coil 25 in parallel.

In Figures 3, 4, and 5, 61 is a dial plate, 62
66 is a time display pointer, 66 is a power-off display pointer, 33a is a normal pulse movement area, 33b is a corrected pulse movement area, and 33C is a power-off display pointer.

Next, we will describe how the power-off display pointer 33C moves depending on the pulse situation. First, the Q output of the T-FF 6 is set to HIGH (hereinafter referred to as H), and the Q output of the 5-RFF 20 is set to a state of [■]. In this state, a normal pulse is input to T-FF6, and the Q signal becomes H, gate group 7
AND game) 7a, 7b and OR gate 70 and A
The input of ND gate 11 also becomes H, and inverter 9, NO
It is input to the drive circuit 15 via the R gate 16, and is also input to the AND gates 8a, 8b and OR gate of the gate group 8) 8C.
Furthermore, the output of the AND gate 12 becomes LOW (described below) and is input to the drive circuit 15 via the inverter 10 and the NOR gate 14, and current flows from the terminal 27 to the drive coil 21, causing the rotor 62 to Rotate. The current for one pulse flowing through the drive coil 21 is then measured by the ammeter 26.
flows into. The current for one pulse is filled in the capacitor 22 and flows to the coil 25, and the coil 25 is rotated by the repulsive force of the magnets 240 provided on both sides of the coil 250. 33C within the normal pulse movement region 53a.

Next, if the rotor 62 is not reversed by the normal pulse,
The L signal is input to the inverters 16 and 17, and the L signal is input to the 5-RFP via the NAND gate 18 and the AND gate 19, and the Q output is maintained at the H signal, and normal pulses and correction pulses are output. Become. Current for two pulses, a normal pulse and a correction pulse, is charged into the capacitor 22, and the current flows into the coil 25. The repulsive force of the magnets 24 provided on both sides of the coil 250 rotates the coil 25, and the power-off display pointer 33C is activated. It moves across the normal pulse movement area 33a and the corrected pulse movement area 33b.

Further, the capacitor 22 is arranged such that it can release the current already charged before the next normal pulse for driving the rotor 62 or the correction pulse is applied.

〔Effect of the invention〕

As is clear from the above explanation, according to the present invention, the hands other than the time display hand perform strange movements in response to the time display hand ticking. It is not an intermittent type movement (it is a smooth movement, and by coexisting these two types of movement on the dial, it is possible to add interest to the original beauty of analog. Furthermore, the size of the drive pulse Depending on the setting, the pointer's deflection becomes thicker or smaller, which appears on the dial, giving the viewer an indication of the current state of the watch, for example, even though the calendar is not set. The pointer is thick (if it continues to take pictures, it has the effect of letting you know that the battery voltage is low or that some kind of load is being applied to the watch.

[Brief explanation of the drawing]

Fig. 1 is a circuit block diagram of an electronic timepiece showing an embodiment of the present invention, Fig. 2 is a waveform diagram showing output waveforms of the circuit block diagram shown in Fig. 1, and Fig. 3 shows an embodiment of the invention. A plan view of the electronic watch, FIG. 4 is an enlarged view of the part of FIG. 3 related to the present invention, and a plan view of the main part showing the state of the pointer when driven by normal pulses. FIG. 5 is the same as FIG. 4. FIG. 3 is an enlarged view of the part related to the present invention, and is a plan view of the main part showing the state of the pointer when driven by a correction pulse. FIG. 3 is a plan view showing the step motor. 1... Oscillation circuit, 2... Branch circuit, 6... Normal pulse forming circuit, 4... Correction pulse forming circuit, 5...・Coil opening/closing pulse forming circuit, 15...
... Drive circuit, 21 ... Drive coil, 23 ... Ammeter, 24 ... Magnet, 25 ... Coil. 2rlA Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] A step motor for moving clock hands, an oscillation circuit, a frequency dividing circuit, a normal pulse forming circuit, a correction pulse forming circuit, a drive circuit for driving the step motor based on pulses from the normal pulse forming circuit, and the step motor. a detection circuit that detects rotation or non-rotation of a rotor constituting the rotor, and a control circuit that outputs a correction pulse from the correction pulse forming circuit to the drive circuit when the detection circuit detects non-rotation of the rotor. An electronic timepiece characterized in that a current measuring device is connected within the current path of the driving circuit, and the state of the current flowing through the driving circuit is displayed by a pointer of the current measuring device. .