JPS5872082A - Electronic timepiece - Google Patents

Abstract

PURPOSE:To obtain an electronic timepiece whose abnormality can be reported to the user, by controlling the second hand so that it move in a manner different from the normal manner when the abnormality occurs in the timepiece. CONSTITUTION:When a battery 44 is applied, a signal for normal second hand driving passes from a selecting circuit 7 to drive a rotor 17 through a second hand driving signal distributing circuit 11, a driving circuit 15, and an electromagnetic coil 16 at every one second, and the second hand advance at every one second in the normal manner. The signal from an hour and minute hand driving signal generating circuit 5 drives a rotor 30 through an hour and minute hand driving signal distributing circuit 18, a driving circuit 28, and an electromagnetic coil 29 to move hour and minute hands. The second hand is moved normally when the rotor 30 is rotated normally; but when the rotor 30 is rotated abnormally by some cause of shock, dust, a low temperature, a magnetic field, or the like, the second hand is moved continuously at every two seconds by a controlling circuit 35, and thus, the user becomes aware of the abnormality to find that the time display is not correct.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electronic timepiece having two step motors: a step motor for driving the second hand and a step motor for driving the hour and minute hands.

In a typical 3-hand electronic watch, a single step motor drives the second hand and hour/minute hands, but in such a 3-hand electronic watch, the step motor is driven based on a correction signal. Correct the indicated position of the pointer,
The so-called electromagnetic correction method has not been adopted because it takes too much time to correct. However, in order to realize an analog electronic watch that has additional functions in addition to the simple time display function, such as a time difference correction function watch, and an alarm function watch where the hour and minute hands for time display also serve as alarm guide hands, It is essential to adopt the electromagnetic correction method described above.

Recently, in order to realize analog electronic watches having various functions, proposals have been made for electronic watches having two step motors: a step motor for driving the second hand and a step motor for driving the hour and minute hands. In this type of watch, the second hand and the hour and minute hands can be driven independently, so the indicated positions of the second hand or the hour and minute hands can be corrected in a short time by electromagnetic correction.

However, in this type of watch, since the two steno knob motors are driven independently, there is a possibility that even if the hour and minute hands stop moving for some reason, only the second hand continues to move.

In such a case, the user of the watch may think that the watch is operating normally, and there is a high risk that the user will read the incorrect time display as the correct time display.

The purpose of the present invention is to eliminate the above-mentioned drawbacks, and to enable the second hand to move differently from the normal hand movement when an abnormality occurs in the watch.
The purpose of the present invention is to obtain an electronic watch that can notify the user that there is an abnormality in the watch. Signal generation circuit, hour and minute hands,
A detection circuit detects rotation or non-rotation of the rotor of a drive step motor, and when this detection circuit detects non-rotation of the rotor, the second hand drive step motor is driven by the signal, and the second hand moves in a manner different from normal hand movement. The present invention is characterized in that it has a control circuit for controlling to perform the following.

The present invention will be described in detail below with reference to the drawings.

FIG. 1 is a circuit block diagram showing an embodiment of an electronic timepiece according to the present invention, and FIG. 2 is a signal waveform diagram thereof.

In FIG. 1, 1 is a crystal oscillation circuit, and 2 is a frequency dividing circuit. 6 is a signal generating circuit for driving the second hand, which has waveform A in Fig. 2.
A normal second hand driving signal is generated every second as shown in FIG. 4 is a signal generation circuit for driving the warning second hand, and waveform B in Fig. 2
Two consecutive warning second hand driving signals are generated every two seconds as shown in FIG.

Reference numeral 5 denotes a signal generation circuit for driving the hour and minute hands, which generates a signal for driving the hour and minute hands every 20 seconds as shown in waveform C in FIG. Reference numeral 6 denotes an electromagnetic coil opening/closing signal generating circuit, which generates three continuous narrow electromagnetic coil opening/closing signals every 20 seconds as shown in the waveform of FIG.

The output signals of the normal second hand driving signal generating circuit 6, the warning second hand driving signal generating circuit 4, the hour/minute hand driving signal generating circuit 5, and the electromagnetic coil opening/closing signal generating circuit 6 are sent to an appropriate output stage of the frequency dividing circuit 2. Normally, the phase of the second hand drive signal and the hour/minute hand drive signal is shifted,
To explain the present invention in detail, first, the load on
When the alarm setting time arrives, the latch 14 is set by a signal from the coincidence circuit 6, and the alarm drive circuit 15 is operated by the output Q21, and the alarm starts sounding. At the same time, the timer 12 starts counting, and the control circuit 10 uses the one-shot reading pulse A to record the brightness around the clock, which is input to the optical sensor 4 at that moment, as illuminance data.
is read from the decoder 8 into the register 9 and stored.

New illuminance data are constantly input to the decoder 8, and are successively compared with the previously read illuminance data (2) in the comparison circuit 11. One second after the alarm starts sounding, the timer output = 1, and the output of the comparison circuit 11 = 1.
When the current brightness changes from the brightness around the clock when the alarm starts sounding, the latch 14 is reset by the read pulse C and the output Q
= 0, and the alarm stops sounding.

It is very easy to change the brightness around the watch here, by moving your arm to move the direction or position of the watch to a brighter or darker direction, or by moving the watch with your other hand. You can also make it darker. Next, the second embodiment will be explained with reference to FIG. When compared, it is found that the values of the adjacent 21 pins are different.This is the system in which a signal to stop the alarm is issued.The same symbols as in FIG. 1 indicate the same elements, so the explanation will be omitted.

In other words, in FIG. 2, when the alarm starts sounding at the Q output -1 of the latch 64, the timer 62 starts counting for 1 second.At this time, the control circuit 60 starts counting the timer 32.
Since there is no output from the comparator circuit, the comparison circuit 51 does not operate.
Latch 63 at readout output F = O to read the output of
The alarm continues to sound without being reset. When the timer 62 finishes counting one second, the control circuit 30 starts operating and outputs a data read pulse D and a read pulse F.
Output.

In the decoder 28, the input terminal of the R gate 27 from the sensor output circuit 5 is connected to the output terminal of the AND gate 21 and the output terminal of the AND gate 26. 2all-1: A drive circuit for driving the hour and minute hands. It is composed of four MOS transistors, and the input terminal is connected to an inverter 24.2.
5. Connected appropriately to the output terminals of NOR gates 26 and 27,
An electromagnetic coil 29 of a step motor for driving the hour and minute hands is connected to the output end.

60 is a rotor for driving the hour and minute hands, which together with the electromagnetic coil 29 and a stator (not shown) constitutes a step motor for driving the hour and minute hands, and rotates one step each time a current in a different direction flows through the electromagnetic coil 29. and drives the hour and minute hands via a gear train (not shown). 31 (a detection circuit for detecting rotation or non-rotation of the l-i rotor 60, which is composed of an inverter 62, 36 and a NAND gate 64,
In/(-Taro 2.66 output terminal is NAND gate 64
The input end is connected to both ends of the electromagnetic coil 290.

65 is a control circuit, which includes AND gates 66, 67, OR gates 38, 69, binary counter 40, and 7'41 (hereinafter referred to as S-RFP).
The input terminal of the AND gate 66 is NAN
It is connected to the output terminal of the D gate 34 and the output terminal of the electromagnetic coil switching signal generation circuit 6, and the input terminal of the OR gate 68 is connected to the AN
The output terminal of the D gate 66 is connected to the output terminal of the switch 42 and the forward-on-reset circuit 43, and the OR gate 69
The input terminal of the switch 42 and the
6 output terminals, respectively. Note) The power-on-receiver circuit 46 is configured to generate one pulse signal only when the battery 44 is inserted, and the switch 42 is normally configured so that the external operating member 45 is pushed in the direction of the solid arrow, so that the battery 44 is not activated. Connected to the negative side.

Next, the input terminal of the counter 40 is connected to the output terminal of the hour/minute hand drive signal generation circuit 5, and the reset terminal is connected to the OR gate 68.
The input terminal of the AND gate 67 is connected to the two output terminals of the counter 40, the set terminal of the 5-RFF 41 is connected to the output terminal of the AND gate 67, and the reset terminal is connected to the output terminal of the OR gate 69. connected to the end. The output terminal of the 5-RFF 41, which is the output terminal of the control circuit 65, is connected to the input terminal of the AND gate 8 of the selection circuit 7.
6 and directly connected to the input terminal of AND gate 9.

Next, the operation will be explained. When the battery 44 is first turned on, one pulse signal is generated from the power-on reset circuit 46, the counter 40 and the 5-RFF 41 are reset, and the outputs of the counter 40 and the S-RFF 41 each become an L signal. At this time, since the external operating member 45 is pushed in the direction of the solid arrow, the switch 42 is connected to the negative side of the battery 44. Therefore, selection circuit 7
A normal second hand drive signal as shown in FIG. 2(A) passes through the second hand drive signal distribution circuit 11, drive circuit 15, and electromagnetic coil 16 to drive and rotate the rotor 17 every second. Therefore, the second hand is driven via the wheel train and moves normally every second.

Also, since the hour and minute hand drive signal generation circuit 5 generates an hour and minute hand drive signal every 20 seconds as shown in waveform C in FIG. 2, the hour and minute hand drive signal distribution circuit 18 and the drive circuit 2
8. The rotor 60 is driven at 20 seconds via the electromagnetic coil 29, and the hour and minute hands are driven via the wheel train to perform hand movement.

After a short period of time has passed after the application of the hour and minute hand drive signals, the electromagnetic coil opening/closing signal as shown in the waveform of Fig. 2 is generated.
The drive circuit 28 is stamped. At this time, an induced voltage is generated at one end of the electromagnetic coil 29 due to the rotational movement of the rotor 60. This induced voltage exceeds the threshold voltage of the inverter 62 or 63 when the rotor 60 rotates normally, and does not exceed the threshold voltage of the inverter 32 or 66 when the rotor 60 does not rotate normally.

This operating principle has already been described in Japanese Patent Application Laid-Open No. 53-2196.
6, detailed explanation will be omitted here.

Next, a case where the rotor 60 rotates normally will be described. When the rotor 60 rotates normally, a voltage exceeding the threshold voltage is applied to one of the inverters 62 or 63.
Therefore, one of the inverters 62 and 63 outputs an L signal, and the NAND gate 64 outputs an H signal. Therefore, the counter 40 is reset via the AND gate 66 and the OR gate 68, and the output of the 5-RFF 41 remains at the L signal. Therefore, the second hand is normally driven based on the second hand drive signal. In this way, when the rotor 60 for driving the hour and minute hands rotates normally, the second hand moves normally.

Next, suppose that the rotor 60 cannot rotate normally due to some reason such as impact, dust, low temperature, magnetic field, etc. Even if the electromagnetic coil open/close signal is applied to the drive circuit 28, the electromagnetic coil 2
No voltage exceeding the threshold voltage of inverter 62 or 66 is generated from one end of NAND gate 64 and I
r1H signal is not output. Therefore, the counter 40 is not reset, and the counter 40 is counted by the hour and minute hand driving signals, and outputs an H signal.1) However, at this time, the S-4FF41 is not reset yet, and the
The output of F41 holds the L signal for the next 20 seconds, and the next hour/minute hand drive signal is applied to the drive circuit 28, but since the rotor 6o could not rotate normally last time, it - The phase with the minute hand drive signal does not match, and it cannot rotate normally again3. Therefore, even if the electromagnetic coil opening/closing signal is applied to the drive circuit 28, the threshold of the inverter 62, 66 is transmitted from one end of the electromagnetic coil 29. A voltage exceeding the value voltage is not generated and the counter 4o is not reset.

Therefore, the counter 40 counts based on the hour and minute hand driving signals and outputs H and L signals. However, at this time, the output of S-4FF41 still held the L signal,
For the next 20 seconds, the second hand continues to move normally every second. Next, when 20 seconds have elapsed, the counter 4° is counted by the hour and minute hand drive signals, and outputs H and H signals. Therefore, 5-RFF411d is set,
The output of the S-RFF 41 is switched to an H signal and held.

This state does not change even if the rotor 60 starts to rotate normally thereafter.

When the H signal is output from the 5-RFF 41, a warning second hand drive signal as shown in waveform B in Fig. 2 is passed from the selection circuit 7, and the second hand moves continuously every 2 seconds, which is different from the normal hand movement. will begin to do this. Rotor 60 like this
If the rotor 60 cannot rotate normally twice in a row, then the rotor 60
Even if the second hand rotates normally, the second hand will continue to move every two seconds. As a result, the user of the watch notices that there is something wrong with the watch and knows that the time display is incorrect.

Next, the user pulls out the external operating member 45 in the direction of the dotted arrow to align the needles. For example, the external operating member 45
When the rotor 30 is rotated, a correction signal is applied to the drive circuit 2 from a time correction signal generation circuit (not shown), and the rotor 30 is rotated to perform hand alignment. At this time, since the switch 42 is connected to the positive side of the battery 44, the counter 4D and S-4FF41 are reset, and the output 14L signal of the 5-RFF41 is switched and held. Furthermore, the frequency dividing circuit 2 is also reset.

After setting the hands at the correct time, the external operating member 45
When the switch 42 is pushed in the direction of the solid arrow, the switch 42 is connected to the negative side of the battery 44 again, and the reset of the frequency dividing circuit 2 is also canceled. Therefore, from the next step onwards, the second hand will move normally every second.

As is clear from the above explanation, the electronic timepiece according to the present invention has the following features:
If the hour and minute hands temporarily stop moving for some reason,
Since the second hand moves in a manner different from normal hand movement, the user is prevented from reading an incorrect time display as a correct time display.

It should be noted that the second hand may be configured to automatically move normally after the hand alignment operation is performed by operating the external operating member.

[Brief explanation of the drawing]

FIG. 1 is a circuit block diagram of an electronic timepiece according to the present invention, and FIG.
This figure is an output voltage waveform diagram of a main part of the circuit block diagram shown in FIG. 1. 6...Normal second hand drive signal generation circuit 4...
・Warning signal generation circuit 5 for driving the second hand...Borrow generation circuit 7 for driving the hour and minute hands...Selection circuit 15...Drive circuit 16 for second hand and @ movement...Step motor for driving the second hand Electromagnetic coil 17・
・Rotor 28 of the step motor for driving the second hand...Drive circuit 29 for driving the hour and minute hands...Electromagnetic coil 60 of the step motor for driving the hour and minute hands...Rotor 31 of the step motor for driving the hour and minute hands
Detection circuit 65...Fuji control circuit procedure amendment document 1. Indication of the case 1932 Patent Application No. 170826 2. Name of the invention 3. Person making the amendment Relationship to the case Patent applicant Telephone (Tokyo) 342-1231 4. Date of the amendment order 6. Supplementary [E. Column 7 of "Detailed Description of the Invention" of the subject specification, supplementary peaks and valleys (1) The entire text of page 5 of the specification is amended as shown in the attached sheet. (2) Correct the entire text of the 6th stroke of Meijo Tatami as shown in the attached sheet. 8 Attachments: 1 copy of the report on the catalog of attachments. 7 is a selection circuit, AND gate 8, SO and OR gate 10
It is controlled by an output signal from a control circuit 65, which will be described later, and selects and passes either the normal second hand drive signal or the one-note second hand drive signal described above. 11
is a signal distribution circuit for driving the second hand, which is composed of a toggle flip-flop 12 (hereinafter referred to as T-FF) and a NANi gate 16.14, and the input terminal of T-FF 12 is connected to the OR gate 10 of the selection circuit 7. connected to the output end of the NA
The input terminal of the ND gate 16 is connected to the output terminal of the OR gate 10 and the output terminal Q of the T-FF 12.
The input terminal of 4 is connected to the output terminal of OR gate 10 and the output terminal of T-FF1. 15 is a 5 drive circuit for driving the second hand, which is composed of four MOS transistors.The input terminal is connected to the output terminal of the NAND gate 13.14, and the output terminal is connected to the electromagnetic coil of the step motor for driving the second hand. 16 are connected. 17 is a rotor for driving the second hand, which together with an electromagnetic coil 16 and a stator (not shown) form a step motor for driving the second hand. It rotates and drives the second hand via a wheel train (not shown).18 is a signal distribution circuit for driving the hour and minute hands;
AND gate 20.21.22.26, inverter 24
．． 25, composed by NOR Guton 6.27 etc.
The input terminal of T-FFi9 is connected to the output terminal of hour/minute hand, drive signal - brother generation #55 (n, A, N I) gate 20
．． The input terminal of 21 is connected to the output terminal of the signal generating circuit 5 for driving the hour and minute hands and the output terminal Q of the f-FF.
The input ends of the AND gates 22 and 26 are connected to the output ends Q, Q of the T-FFi 9 and the output end of the electromagnetic coil switching signal generation circuit 6.

Claims (1)

[Claims] In an electronic watch that has two step motors: a step motor for driving the second hand and a step motor for driving the hour and minute hands,
A warning second hand driving signal generation circuit that generates a signal to cause the second hand to perform a hand movement different from normal hand movement, a detection circuit that detects rotation or non-rotation of the rotor of the step motor for driving the hour and minute hands, and this detection circuit. An electronic timepiece, characterized in that the electronic timepiece is provided with a control circuit that drives the second hand driving step motor in accordance with the signal when the rotor detects non-rotation, and controls the second hand to perform a hand movement different from normal hand movement.