JPH01244389A - Time correcting method of analog clock - Google Patents

Abstract

PURPOSE:To stop the rotor of a step motor at a desired corrected time position quickly by inputting a pulse of sufficient long pulse width in the step motor after the drive pulse in the time modifying operation. CONSTITUTION:In the case where a minute hand is late to correct time, when an operator hears a time siren and the like and turns on a correct time setting switch S3, an LSI 11 quickly rotates a motor 12 clockwise (arrow F) by outputting a drive pulse starting at (H) from the terminals of (OM1) and (OM2) in high cycle of 1/25sec. When it judges that correct time setting is completed, only the terminals of (OSO), (OM3) and (OM4) input the stop pulses into the motor 12, the pulse width T2, T3 of the stop pulses being sufficiently longer than the pulse width T1 of the drive pulse for the time correction by the timing which becomes (H) next in the motor 12. Thereafter, it returns to normal time indicating operation, the drive pulse for normal clockwise pointer operation is generated, hereafter the motor is rotated in step at a cycle of 4sec and the minute hand is driven.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a clock displaying an analog clock, and more particularly to a method for adjusting the time of an analog clock using a built-in step motor.

[Conventional technology]

Usually, analog box clocks installed in automobiles and the like are supplied with a power source from a battery or the like, and therefore are required to consume extremely low power. For this reason, analog 1f
A low power consumption type step motor is used to drive the hands of the clock, and the hands are moved intermittently in order to minimize the current consumption of the step motor during normal time display operations. However, when adjusting the time, there is a risk of high power consumption as the hands are rotated continuously, and users are dissatisfied with the discomfort caused by irritation when adjusting the time.To prevent this, the time can be adjusted in a short time. It is necessary to carry out Therefore, the frequency of the drive pulse input to the step motor when adjusting the time is 100% to 100% higher than the frequency of the drive pulse for normal time display operation, which increases the speed of hand movement.
The setting is 1,000 times.

FIG. 7 shows a time chart in a conventional time adjustment method. In the figure, when in time correction mode, it is 1/25.
Give a drive pulse with a high-speed cycle of 6 seconds to the step motor,
The pointer is moved to the desired position. When the time display operation is completed (symbol A), the time display operation is immediately switched to the normal time display operation with a cycle of 4 seconds.

[Problem to be solved by the invention]

However, in the conventional time adjustment method shown in FIG. 7, the operation switches to the normal time display operation immediately after the time adjustment operation is completed, so the operation of the step motor cannot follow the frequency change in the drive pulse, and the desired result cannot be achieved. There was a problem that the hands could not be stopped at the time adjustment position. Normally, if the excitation force supplied to the step motor exceeds the self-starting excitation force during the time adjustment operation, the rotor of the step motor immediately stops. However, in the case of the conventional time adjustment method, after the time adjustment operation is completed (symbol A), the input to the step motor is temporarily stopped in order to switch to the normal time display operation with a cycle length 640 times longer. become. As a result, the supplied excitation force drops to zero, which naturally falls below the self-starting excitation force, and as a result, the rotor of the step motor cannot be stopped immediately due to the rotational inertia of the self and subordinate gears.
The motor rotates until the rotational inertia energy overcomes the detent torque energy (pawl torque energy) of the step motor. In other words, when switching from the time correction operation to the normal time display mode, the step motor is not necessarily synchronized with the frequency of the normal time display operation, so in the worst case, a lead or lag of up to 16 seconds occurs.

FIG. 8 is a characteristic diagram showing the operation of the step motor.

In the figure, S□ indicates the self-starting characteristic from the stop state to the drive state of the step motor, and J indicates the operating characteristic of the drive progress. Generally, in a step motor, as the frequency of the drive pulse increases, the difference between the self-starting characteristic S□ and the minimum operating characteristic S2, that is, the operating range tends to become wider. This means that even if the input to the step motor is stopped, for example at a frequency of 256T (z), it will not stop immediately, but the rotor of the step motor will rotate until the drive voltage becomes less than the value of the minimum operating characteristic S. .

[Means to solve the problem]

In order to solve the above-mentioned problems, the present invention provides that when the input signal to the stepper motor switches from a high frequency during time adjustment to a low frequency during normal time display, the input signal at the end of the time correction or the first time of the normal time display. One or more pulses of a signal having a sufficiently long pulse width for stepping are input to the step motor.

[For production]

One or more pulses of a signal with a sufficiently long pulse width are input to the step motor at the end of time adjustment or at the beginning of normal time display.

〔Example〕

An embodiment according to the present invention will be described with reference to the drawings.

FIG. 3 is a circuit diagram of an analog move hour setting mechanism according to the present invention. In the figure, T-T is a DC voltage of 12V.
is applied to the power supply terminal, 1o is diode D□, Zener diode D, 11 resistor R0, transistor 3 T
r, a constant voltage 'lt source circuit composed of a capacitor c1; 11 is the control part 1, for example Fujitsu Membrane, MB87;
This is an integrated circuit represented by 015 (hereinafter referred to as "old man"). In this IJll, 1'-CMRJ is an input terminal for setting the hour, lcMjJ is an input terminal for fast forward correction, and rCM2J is an input terminal for performing slow forward correction, and signals can be input by turning on the switches S to S8. Here, the switch S8 is an hour setting switch. Also, “O20
” is an output terminal for operating the photointerrupter 13, which is the detection section, and “csIJ is an input terminal for inputting the signal from this photointerrupter 13.l'-
OMIJ~l'-0M4J constitutes an output terminal that outputs drive pulses to the motor 12.
3" terminal is connected to the motor coil 12a, "0M2J, rO
The M4J terminal is connected to the motor coil 12b. By changing the direction of the current flowing through these two motor coils, the rotational direction of the motor 12 can be controlled. For example, for the motor coil 12a [
A current flows from the OMIJ terminal to the rOM3J terminal, and at the same time, the current flows from the rOM2J terminal to the rOM4 to the motor coil 12b.
When current is applied to the J terminal, the motor 12 rotates clockwise. Konoto! The roM3j and OM4 terminals are connected to each other so that the output to the motor 12 appears to be AC.
J, roM2J Outputs a drive pulse that is delayed by one cycle with respect to the drive pulse at the terminal. Also, by changing the frequency of the drive pulse output from this output terminal, the motor 1
The rotation speed of 2 can be controlled. “vDD”, “
"v88" is the power supply terminal of LSllll. In addition, R
2-R2 is a pull-up resistor, C2 to C8 are capacitors,
cr is a crystal oscillator.

FIG. 4 is a structural diagram of the area around the minute hand disposed on the motor 12. In the figure, 40 is a minute wheel mechanically connected to the rotating shaft of the motor 12 by a gear train, and 40 & is a detected part provided along the circumference of the minute wheel 40 over a range of 180. 41 is a minute hand shaft attached to the minute hand wheel 40, and 42 is a minute hand attached to one end of the minute hand shaft 41. This minute hand 42 is located at the end portion t of the slit 4Qa.
It is attached to the minute hand lI+41 in a position corresponding to 40b. Further, the photointerrupter 13 described above is arranged so as to sandwich the minute wheel 40, and when the minute wheel 40 is interposed therebetween, the light to the light receiving element is blocked and the photointerrupter 13 is in an off state. When the minute wheel 40 rotates and detects 40 m, the light from the light emitting element reaches the light receiving element and turns on. Note that 40e is an end position 180 degrees opposite to end position 40b.

FIG. 5 is an explanatory view showing the position of the minute hand 42 from the front. In the figure, the minute hand 42 and photointerrupter 13 are shown transparently (indicated by broken lines) for convenience of explanation.

13m is a sense point of the photo interrupter 13. Normally, there are two cases when setting the hour on the hour. In other words, there are cases where the minute hand 42 is behind the hour as shown in FIG. 5(a), and cases where the minute hand 42 is ahead of the hour as shown in FIG. 5(b). In this embodiment, we will first consider the case where the minute hand is delayed.

Now, when the minute hand 42 is delayed with respect to the hour as shown in FIG. The CMRJ terminal in the LS 111, which had been held at n, becomes rLJ, and the hour setting operation starts. When this operation is started, first, as shown in the time chart shown in FIG. 1, the first child of [08OJ becomes rHJ, the photointerrupter 13 operates, and the internal light emitting elements such as light emitting diodes light up.

At this time, the light-receiving element receives the light from the light-emitting element through the line 41m, so the photointerrupter 13 is turned on and outputs rHJ to [csIJ@]. Then, LS1ll judges that this 1g means that the minute hand 42 is at a delayed position relative to the hour, and
Drive pulses as shown in Fig. 1 (c) to (f) starting at rHJ from the I J and JOM2 J terminals are
By outputting at a high speed cycle of 6 seconds, the motor 12 is rotated in a fast forward direction clockwise (arrow F). These 1'-O
Drive pulses from the MIJ to rOM4J terminals are output continuously. Eventually, the minute wheel 40 rotates and the slit end position 4
When 0c reaches the sense point 1aa, the light Fi incident on the light receiving element is cut off, the l'-C8IJ terminal becomes rLJ, and the photointerrupter 13 is turned off. At this time, the LS11 determines that the hour adjustment has been completed, as shown in Figure 5(c), and changes the output of the "O20" terminal to r.
At this timing, the output terminal becomes rLJ.
Output is stopped except for the rOM3J and rOM4J terminals. Then, "0M3J OM4 J terminal is next [
The pulse width 'r which is sufficiently longer than the pulse width T @ (3,91maee) of the driving pulse on the hour at the timing of J.
,,'r, (31.25m+sse, 29.30m
A stop pulse of 5ec) is input to the motor 12. After this, the normal time display operation is resumed, and 4 seconds after the switch s8 is turned on, a drive pulse for reverse clockwise movement is generated, and the motor rotates step by step every 4 seconds, and the minute hand 42.
will be driven. In addition, [cMRJ @ child
While LJKn o, enters the main operation for 25 seconds 5,0.2
If rLJ is held for more than 5 seconds, it is ignored.

Next, a case where the minute hand is advancing relative to the hour as shown in FIG. 5(b) will be described. As mentioned above, when the hour setting switch S8 is turned on for P1, the CMRJ terminal becomes rLJ, and as shown in the time chart shown in Fig. 2, it becomes "O20".
The terminal becomes rHJ. At this time, the photo interrupter 13
does not detect slit 41&, so it is in the off state, and "
The output to the "C8■" terminal becomes rLJ. At this time, LSL
ll determines that the minute hand 42 is in a position ahead of the hour, and rOMIJ.

[0M4J terminal to rT (Figure 5 (C) starting with J - (
By outputting drive pulses as shown in f) at a high-speed cycle of 1/256 seconds, the motor 12 is rapidly rotated in the counterclockwise direction (arrow B). These “OMIJ~[0M4
The drive pulse of the J terminal is output continuously. Eventually, the minute wheel 40 rotates, and when the slit end position 40e reaches the sense point 13a, the photointerrupter 13 is turned on, and the terminal becomes [C3lJ terminal rLJ].

At this time, LS11 determines that the hour adjustment has been completed as shown in FIG. Output is stopped except for the "Tai OM3" terminal. Then, at the timing when the rOM2J, [0M3J terminal becomes rHJ next, a pulse width T which is sufficiently longer than the pulse width T8 (3,91m5ec) of the drive pulse set on the hour is applied.
4. T, (31.25m5ec, 29.30maee)
input a stop pulse to the motor 12. After this, the normal time display operation is resumed, and after 4 seconds from the turning on of switch S8, the normal driving pulse for clockwise movement is generated, and from then on, the normal clockwise driving pulse is generated.
The motor rotates in steps every second, and the minute hand 42 is driven. Note that the main operation starts until 0.25 seconds after the cMRJ terminal becomes rLJ, and it is ignored when rLJ is held for more than 0.25 seconds.

FIG. 6 is a flowchart showing the operation described above. In the normal operation (step 60), when the hour setting switch S8 is turned on, step 61 becomes [YeJ] and the hour setting operation starts. Next, photo interrupter 1
The output to No. 3 (“O20” terminal) becomes rHJ (step 62). At this time, from the photo interrupter 13 “C
If the output to the "8■" terminal is "H", that is, the minute hand is behind the hour (step 63), a pulse for clockwise rotation is output to the motor 12 via the LSllllYosrOMIJ to rOM4j terminals. (Step 64)
. Then, the motor 12 is fast-forwarded until the output of the csIJ terminal is reversed from rHJ to rLJ (step 65).
, [When the output of the csIJ terminal does not become rLJ, it is determined that the hour adjustment has been completed, and the output to the photointerrupter 13 is set to rLJ, and a stop pulse is input to the motor 12 (steps 68 and 69). On the other hand, if rLJ is reached in step 63, that is, if the minute hand is ahead of the hour, LSllll! 11 [OMIJ~rOM4
A pulse for rotating counterclockwise is output to the motor 12 via the J terminal (step 66).

Then, the motor 12 is fast-forwarded until the output of the "C8" terminal is reversed from rLJ to [J (step 67).
When the output of the "C8" terminal becomes rHJ, it is determined that the hour setting is completed, and the output to the photointerrupter 13 is set to rLJ, and a stop pulse is input to the motor 12 (steps 68 and 69). Then the operation is step 6
When it returns to 0, normal operation resumes.

In this way, the present invention inputs a stop pulse having a pulse width sufficiently longer than the pulse width during the hour setting operation to the motor 12 so as to synchronize with the drive pulse during the hour setting operation. Motor 12 in hour setting mode
can absorb the rotational inertia energy given to it. In addition, the rotating shaft of the motor 12 is temporarily changed (29, 30
m5ec) 9th step to release after holding state, motor 1
The second rotating shaft can be immediately stopped at a desired time adjustment position.

In addition, in the above-mentioned embodiment, the pulse width of the stop pulse (31.25 m5 ec, 29.30 m5 ec) is sufficiently long compared to the pulse width of the drive pulse for setting the hour (3.91 m5 ec).
m5ec) is set, but the pulse width of the stop pulse may be set to a pulse width that is 2 to 40 times the pulse width of the drive pulse for setting on the hour.

〔Effect of the invention〕

As explained above, in the present invention, after the drive pulse in the time adjustment operation, a pulse with a sufficiently long pulse width is input to the step motor so as to be synchronized with the drive pulse. It can absorb rotational inertia energy. Further, since the rotor of the step motor is temporarily held in the holding state and then released, the rotor of the step motor can be immediately stopped in a desired time adjustment method.

[Brief explanation of the drawing]

Fig. 1 is a time chart when the minute hand is delayed relative to the hour according to the present invention, Fig. 2 is a time chart when the minute hand is advanced relative to the hour, and Fig. 3 is a time chart of the analog move hour setting structure. Circuit diagram, Fig. 4 is a configuration diagram around the minute hand, Fig. 5 is a conceptual diagram showing the position of the minute hand, Fig. 6 is a flowchart, Fig. 7 is a time chart of the conventional time adjustment method, and Fig. 8 is a step diagram. Motor characteristic diagram. O20...Output terminal for operating the photointerrupter 13, O8I...Input terminal for inputting a signal from the photointerrupter 13, OM1-OM4...Output terminal to the motor 12.

Claims (1)

[Claims] In an analog watch in which a built-in step motor drives a hand to display and adjust the time, the input signal to the step motor varies from a high frequency when adjusting the time to a low frequency when normally displaying the time. When switching to
A method for adjusting the time of an analog timepiece, comprising inputting one or more pulses of a signal having a sufficiently long pulse width to the step motor at the end of the time adjustment or at the beginning of the normal time display.