JPS59217183A - Electronic timepiece - Google Patents

Abstract

PURPOSE:To make it possible to certainly perform first hand movement after a power source is turned ON, by controlling the output direction of a motor driving force on the basis of the detection of rotation and non-rotation. CONSTITUTION:The output of an oscillator circuit 1 is supplied to a pulse synthesizer circuit 3 while subjected to frequency division by a frequency divider circuit 2 and synthesized as the operation pulse of a motor driver 4 and a detection circuit 5. The driver 4 operates a motor 6 and the detection circuit 5 amplifies the inverse electromotive force of a coil generated at the output terminal of the driver 4 when the motor 6 is driven to discriminate the rotation and non- rotation of the motor 6. The output direction of a motor driving force is changed over and controlled on the basis of said discriminated output. As a result, the motor 6 can be certainly operated in first hand movement after a power source switch 1 to actuate in conjunction with a crown is turned ON.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electronic timepiece with a power switch. Specifically, the present invention relates to hand movement control for ensuring the first hand movement after power is turned on in an electronic watch with a power switch.

Conventionally, various measures have been taken for electronic watches in consideration of battery consumption during the distribution period from the manufacturer to the user. For example, the former method involves stopping the output of motor drive pulses until it reaches the user, or installing a power switch that stops power supply to the IC. The relatively large force of the motor only stops the operation. In the IC, except for the oscillation circuit and the motor polarity holding mechanism, Ree θ is set to the state to prevent through current. However, since the part that consumes the most power in process 0 is the oscillation circuit, the 7-lip 70-tube (hereinafter abbreviated as F/F) of the frequency divider circuit 2 is used as Re.
Even if the motor drive pulse output is stopped in the 5et state,
Power will be consumed. There is also power consumption due to current flowing into the reset terminal.

Therefore, in order to completely eliminate the power consumption of the IC and motor, it is better to provide a power switch. When this method is used, the capacity of the battery only decreases due to self-discharge, and the decrease in battery capacity before being delivered to the user is significantly reduced.

However, when the power switch is turned off, the relationship between the direction of the current that drives the motor and the magnetic polarity of the rotor cannot be maintained, so there is a drawback that the initial drive after the power is turned on becomes uncertain.

The present invention is intended to eliminate the above-mentioned drawbacks, and is intended to ensure the initial movement of the hands after the power is turned on (01+) in a watch equipped with a single power switch.

The present invention will be explained below based on the drawings.

FIG. 1 is a block diagram of an electronic timepiece according to the present invention. A is an integrated circuit. The output of the oscillator circuit 1 is input to the frequency divider circuit 2,
The branch output is sent to the motor driver 4 by the pulse synthesis circuit 3.
．． The signal is synthesized into a pulse that operates the detection circuit 5. The motor driver 4 supplies power to operate the motor 6. The detection circuit 5 amplifies the counter electromotive force of the coil generated at the motor driver terminal when the motor is driven, and performs an operation to determine whether the motor is rotating or not. In the electronic timepiece of the present invention, in order to reliably drive the motor during the first hand movement after the power is turned on, the motor drive pulse output direction is switched and controlled by the output of the circuit A5. Further, 7 is a power switch, which is configured to mechanically interlock with the crown.

Next, the detection mechanism will be explained in more detail using FIGS. 2 and 6. FIG. 2 shows a motor driver circuit A and a detection circuit 5 near the motor driver terminal in the electronic timepiece of the present invention.
The pulse synthesis circuit 3 is specifically shown.

The OR circuit G1 performs the first drive after the power supply is turned on and rotates.
A drive pulse with a pulse width that allows detection of non-rotation and subsequent normal drive pulses are input. NAND circuit G3・
G4 receives the output of G1 and the output of the inverting F/F and switches the drive pulse output direction. Inverter 4
1 and 42 [(-1h) are drivers that drive the motor by receiving the outputs of G3 and G4, respectively.

Next, the operation will be explained. First, when the power switch C is turned on, the output direction of the motor drive pulse is switched between the reverse Y/F, which changes the output direction every time the hands move, the rotation detection latch, and all F/F.
F is reset by the output of the power-on clear circuit 3o. The first drive pulse after the power is turned on follows a path of 01°G5.41 and reaches 0UT before the normal drive pulse output.
Output to 1 terminal. This drive pulse is output only once after the power is turned on. Immediately after this drive pulse is output, a rotation detection operation is performed. After the motor drive pulse is output, the back electromotive voltage generated in the coil is amplified by turning ON-OFF T r '4i connected to one end of the detection resistor 510, and is induced on the 0UT1 terminal.

Rotation/non-rotation is determined by determining the magnitude of the induced voltage in the comparator 52. Comparator 5
2 outputs a negative pulse when detecting rotation, and outputs a positive pulse when detecting non-rotation.

During rotation, the output of the latch circuit 53 becomes negative, and resets the pulse generation circuit that turns on and off the Tr connected to the detection resistor for rotation detection, the comparator sampling pulse generation circuit, and the drive pulse generation circuit for rotation detection. Complex game) Prohibits inverted pulsed swords during non-rotation in G2.

FIG. 6 shows a time chart of drive pulses after the power is turned on.

Figure 3 (α) shows the case where the rotor rotates with the first drive pulse output from 0UT1 due to the coincidence of the rotor polarity, the rotor polar direction, and the stator excitation direction after the power is turned on. (b) shows the case where the rotor does not rotate due to the drive pulse output from 0UT1 due to mismatch between the polarity direction of the rotor and the excitation direction of the stator.
At α), the first normal drive pulse is also output from the zero port T1, but this pulse does not move the hands due to the relationship between the excitation directions of the rotor and stator.

In this way, by detecting rotation/non-rotation, the magnetic relationship between the rotor and stator is detected, and when the rotor is not rotating, the output direction of the motor drive pulse can be changed to ensure the first drive after the power is turned on.

According to the present invention, as described above, even in an electronic watch that is equipped with a power switch linked to the button to completely save power until it reaches the user, it is possible to turn on the power by pressing the button. This has the effect of ensuring subsequent initial movement of the hands.

Figure 2 disease

Claims (1)

[Claims] In an electronic watch equipped with a power switch, when the hands first move after the power is turned on, rotation/non-rotation detection is performed, and when non-rotation is detected, the motor drive current direction is switched and the motor is re-driven. An electronic watch that is characterized by: