JP5499677B2 - Analog electronic clock - Google Patents

Description

  The present invention relates to an analog electronic timepiece that displays time according to hands.

  There has been an analog electronic timepiece equipped with a time shift function that always displays a time shifted from a current time by a desired time (for example, Patent Document 1). Recent analog electronic timepieces have a function of receiving a standard radio wave including time information, for example, and automatically correcting the time measured inside the timepiece to the current time. Therefore, if there is no function for shifting the display time from the time measured inside the clock like the time shift function, it is not possible to always display the time shifted by a desired shift time. According to such a time shift function, it is possible to use the display time with the display time advanced by several minutes, or to always display the overseas time by shifting the time difference.

  Further, in recent years, it is confirmed whether or not the position of the pointer is at the detection reference position at a predetermined detection time (for example, 55:00 hours per hour), and if the position of the pointer is deviated from the reference position, An analog electronic timepiece having a hand position detecting function and a hand position correcting function for automatically correcting the position has been developed (for example, Patent Document 2). According to such a needle position detection function and a needle position correction function, for example, although the drive signal is output to a motor that rotationally drives the pointer, the pointer does not rotate or a drive signal is output to the motor. Even if the pointer rotates due to an impact or the like but the position of the pointer is shifted, it is possible to detect and correct this shift.

JP 2005-83969 A JP 2009-85684 A

  However, if the above-mentioned hand position detection function and hand position correction function are added to an analog electronic timepiece having a time shift function, if no action is taken, the time shift function will display the time even if the time is shifted. It was thought that the inconvenience of returning to the original time by position detection occurred.

  In addition, in the assembly process of the analog electronic timepiece, the hands are assembled so that the hands are directed to a predetermined position with all the gears moved to the reference position. At this time, the hands are assembled with a slight deviation. There is. In a conventional analog electronic timepiece having a hand position detection function, the position of the pointer is detected by detecting the rotational position of the gear. There was a problem that it had to be reassembled with high accuracy.

  An object of the present invention is to provide an analog electronic timepiece that can cope with internal adjustment even if there is an assembly error in the hands, and can operate both the time shift function and the hand position detection function without any trouble. is there.

The present invention
First pointer display control means for displaying the current time with a pointer;
Needle position detecting means for detecting whether or not the pointer is at a predetermined inspection position;
Needle position detection control means for operating the needle position detection means at a predetermined detection time;
A needle position correcting means for correcting the position of the pointer when the needle position detecting means detects that the pointer is not in the inspection position;
In an analog electronic watch with
First storage means for storing information on the time to shift the pointer in the direction to advance or delay;
Second storage means for storing information on the displacement amount of the attachment position of the pointer;
Second pointer display control means for displaying, by the pointer, a time shifted from the current time by the time stored in the first storage means;
Detection time changing means for changing the detection time from a predetermined detection reference time based on information stored in the first storage means and the second storage means;
Equipped with a,
The pointer includes a second hand and a minute hand,
The needle position detecting means includes
The overlapping state of the first detected part formed on the minute hand gear rotating in conjunction with the minute hand and the second detected part formed on the second hand gear rotating in conjunction with the second hand is indicated by the minute hand gear. It is configured to detect whether the second hand and the minute hand are at a predetermined inspection position by detecting over a period when the second hand gear is stopped and rotating a plurality of steps, and comparing the detection pattern with a predetermined reference pattern,
further,
An analog electronic timepiece comprising reference pattern selection means for selecting the reference pattern based on at least information stored in the second storage means.

  According to the present invention, the needle position detecting means is based on the information in the first storage means and the second storage means even if the setting position for moving the pointer is advanced, delayed or shifted, even if the attachment position of the pointer is misaligned. Since the detection time at which the needle is operated can be changed, there is an effect that the needle position can be normally detected by operating the needle position detecting means at a timing at which the position of the pointer can be detected.

1 is a block diagram showing an overall configuration of an analog electronic timepiece according to an embodiment of the present invention. It is sectional drawing which shows the mechanism part which performs the hand position detection of a second hand and a minute hand. It is a front view which shows a second hand wheel. It is the table | surface which matched and showed the angle position and transmission hole pattern for every 2 steps of a second hand wheel. It is a front view which shows the wheel train mechanism which rotates a second hand. It is a front view which shows the wheel train mechanism which rotates a minute hand. It is a front view which shows the wheel train mechanism which rotates an hour hand. It is a flowchart which shows the control procedure of the setting data change process performed by CPU. It is explanatory drawing showing the processing content of the setting data change process of FIG. It is a flowchart which shows the procedure of the 1st pointer | guide control process started based on the input of a 1 second signal. It is explanatory drawing showing the timepiece state of the fixed period before and behind the hand position detection time in case the needle | hook shift amount is "0". It is explanatory drawing showing the timepiece state of the fixed period before and behind the hand position detection time in case the needle | hook shift amount is "+1". It is explanatory drawing showing the timepiece state of the fixed period before and behind the hand position detection time in case a needle | hook shift amount is "-1". It is a flowchart which shows the procedure of the 2nd pointer control processing started based on the input of a 2 minute signal.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a block diagram showing an overall configuration of an analog electronic timepiece 1 according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view showing a mechanism portion for detecting a hand position by a first detector.

  The analog electronic timepiece 1 of this embodiment has an analog display unit that displays the time by rotating the second hand 2, the minute hand 3, and the hour hand 4 (see FIG. 2) by electrical drive, and serves as a main body of a wristwatch, for example. It is.

  As shown in FIG. 1, the analog electronic timepiece 1 includes a CPU (central processing unit) 34 that performs overall control of the timepiece, and movements for driving the hands (second hand, minute hand, hour hand) 2 to 4. 30, a first detection unit 31 for detecting the position of the second hand 2 and the minute hand 3, a second detection unit 32 for detecting the position of the hour hand 4, and a RAM that provides a working memory area to the CPU 34 ( Random Access Memory (Random Access Memory) 37, ROM (Read Only Memory) 36 storing a control program and control data executed by CPU 34, EEPROM (Electrically Erasable Programmable ROM) 35 storing control data, and each part A power supply unit 40 that supplies a voltage, an antenna 41 and a detection circuit 42 that receive a standard radio wave for time correction, an oscillation circuit 38 and a frequency divider for supplying a signal of a predetermined frequency to the CPU 34 A path 39, a time counting circuit (time measuring means) 47 that counts signals from the frequency dividing circuit 39, and a switch section 44 having a plurality of operation buttons for inputting operation commands from the outside are provided.

  Of the above configuration, the CPU 34, the time counting circuit 47, and the needle shift amount data storage unit 35a constitute the first pointer display control means for displaying the normal current time. The CPU 34, the time counting circuit 47, the needle shift amount data The second pointer display control means for displaying the time shifted by the storage unit 35a and the shift time information storage area 37a is configured. Further, the first detection unit 31 and the second detection unit 32 constitute a needle position detection unit.

  The movement 30 is provided with a first motor 51 that drives the second hand 2, a second motor 52 that drives the minute hand 3, and a third motor 53 that drives the hour hand 4. Each of the first to third motors 51 to 53 is a stepping motor having a two-pole stator and a two-pole rotor.

  Further, the movement 30 is provided with a gear train mechanism 20 that transmits the rotational motion of the first to third motors 51 to 53 to the hands 2 to 4. As shown in FIG. 2, the train wheel mechanism 20 includes a second hand wheel 24 to which the second hand 2 is fixed through a second hand shaft 24a, a minute hand wheel 25 to which the minute hand 3 is fixed through a minute hand shaft 25a, and an hour hand. An hour wheel 27 to which the hour hand 4 is fixed via a shaft 27a and an intermediate wheel 26 that rotates in conjunction with the minute hand wheel 25 are included. The second hand wheel 24, the minute hand wheel 25, and the hour hand wheel 27 can be independently driven to rotate by the driving force of the first to third motors 51 to 53 with the same rotation axis as the center.

  As will be described in detail later, the second hand wheel 24 rotates once by rotation of 60 steps of the first motor 51, the minute hand wheel 25 rotates once by rotation of 360 steps of the second motor 52, and the hour hand wheel 27 rotates by the third motor 53. It is configured to make one rotation by rotating 360 steps.

  As shown in FIG. 2, the first detection unit 31 includes a light emitting unit 311 that emits light from one side with a second hand wheel 24, a minute hand wheel 25, and an intermediate wheel 26 interposed therebetween, and light that receives light on the other side. And a sensor (light receiving unit) 312. The light emitting unit 311 is configured by, for example, a light emitting diode, and the optical sensor 312 is configured by, for example, a phototransistor. The light emitting unit 311 and the optical sensor 312 are fixed to the bearing plate 16 and the circuit board 10 of the analog electronic timepiece 1 so as to face each other at a preset detection position P. The detection position P is not particularly limited, but in this embodiment, the detection position P is arranged at an angular position of 37 minutes on the minute hand scale on the dial (see FIG. 5).

  The second detection unit 32 detects a transmission hole of another gear that rotates in conjunction with the hour hand 4, and includes a light emitting unit 321 and an optical sensor (light receiving unit) 322 in the same manner as the first detection unit 31. It is arranged at the second detection position P2 (see FIG. 7).

  The frequency dividing circuit 39 supplies a 1-second signal Sg1 output at a 1-second cycle to the CPU 34 and the time counting circuit 47. The time counting circuit 47 counts the 1-second signal Sg1, and the value of the minute digit of the time-measurement data is obtained. The binary signal Sg2 is supplied to the CPU 34 every time an even value is reached.

  In the ROM 36, a setting data change processing program for changing the setting of the time shift function for advancing or delaying the display time and the setting change of the hand position detection time associated therewith, and the second hand 2 and the minute hand 3 based on the input of the second signal Sg1. A first pointer control processing program for performing processing related to the movement of the hand and the needle position, and a second pointer control processing program for performing processing related to the movement of the hour hand 4 and detection of the needle position based on the input of the two-minute signal Sg2 are stored. Yes. Further, in the storage unit 36a of the ROM 36, as one of the control data, a second hole pattern data table (described later) in which a transmission hole formation pattern of the second hand wheel 24 to be described later is recorded corresponding to the rotation angle of the second hand wheel 24 is described. Data equivalent to the diagram of FIG. 4) is stored.

  In the EEPROM 35, when there is an assembly error in the minute hand 3, a storage unit (second storage means) stores data representing a needle shift amount representing the assembly error in steps by the number of steps of the minute hand 3. 35a is provided. As the data of the needle shift amount, a value corresponding to the assembly error of the minute hand 3 is obtained and written in the storage unit 35a in the setting process before factory shipment.

  In the RAM 37, a shift time information storage unit 37a is set in a predetermined area, details of which will be described later with reference to FIG. 9, but the time for shifting the display time by the time shift function (referred to as “time shift time”). , Data representing the correction value of the hand position detection time of the second hand 2 and the minute hand 3, and data representing the corrected hand position detection time are stored.

  FIG. 3 shows a front view of the second hand wheel 24, and FIG. 4 shows a table in which the angular position of each second step of the second hand wheel 24 and the pattern of the transmission hole are shown in correspondence with each other.

  In the second hand wheel 24, a plurality of transmission holes 24h1 to 24h7 are formed as second detected portions at radial positions overlapping the detection position P. These transmission holes 24h1 to 24h7 are formed in predetermined angle segments so as to satisfy the following conditions among the 30 angle segments obtained by dividing the central angle of the second hand wheel 24 every two rotation angles (12 °). Has been.

  The conditions are the first condition that there is always a transmission hole in the angle segment 180 ° opposite to the angle segment without the transmission hole, and “00” step, “10” step, “20” step, “30”. The pattern of presence / absence of transmission holes in five consecutive angle segments starting from the step, “40” step, and “50” step is a unique pattern (that is, the other angle segments are used as starting points). The second condition that the pattern of the presence / absence of transmission holes in five consecutive angle sections is not the same), “00” step, “10” step, “20” step, “30” step, “40” step, “ The third condition is that all the patterns of presence / absence of transmission holes of five consecutive angle sections starting from the 50 ”step do not become“ 00000 ”without holes. Here, the angle section of the “00” step indicates an angle section that overlaps the detection position P when the second hand 2 is at the reference position (00 second position).

  Further, in the transmission holes 24h1 to 24h7, the pattern of presence / absence of transmission holes of five consecutive angle segments starting from any angle segment becomes a different pattern by changing the start points. The conditions are also met.

  In the second hand wheel 24 of FIG. 3, when the second hand 2 moves from the 00 second step to the 58 second step at a two-step interval, the transmission hole overlaps the detection position P (“with hole” or “1” And a state in which the transmission holes do not overlap (denoted as “no holes” or “0”) appear in the arrangement shown in the “hole pattern” row of the chart of FIG.

  Of the above first to fourth conditions, according to the first condition, when the transmission holes 24h1 to 24h7 of the second hand wheel 24 are not overlapped with the detection position P, the second hand wheel 24 is rotated 180 °. By rotating, any one of the transmission holes 24h1 to 24h7 of the second hand wheel 24 comes to the position of the detection position P, and the second position of the second hand wheel 24 can prevent the detection position P from being blocked. .

  Further, according to the second condition, the second hand 2 is detected five times at two step intervals from the timing at which the second hand 2 is estimated to be at 0 seconds, 10 seconds, 20 seconds, 30 seconds, 40 seconds, and 50 seconds, and the second hand at the detection position P. If the presence / absence of the transmission hole of the vehicle 24 can be detected, it is possible to confirm whether or not the second hand 2 is really at that position (that is, whether or not there is a displacement).

  Further, according to the third condition, the second hand 2 is detected five times at two step intervals from the timing at which the second hand 2 is estimated to be at 0 seconds, 10 seconds, 20 seconds, 30 seconds, 40 seconds, and 50 seconds, and the second hand at the detection position P. When the presence / absence of the transmission hole of the wheel 24 is detected, an effect can be obtained in which it can be distinguished from the case where other gears (for example, the minute hand wheel 25 and the intermediate wheel 26) block the transmission hole.

  Further, according to the fourth condition, when the position of the second hand 2 is unknown, the detection of the presence or absence of the transmission hole of the second hand wheel 24 at the detection position P is detected five times at intervals of two steps (no hole continues five times). Sometimes, the rotational position of the second hand wheel 24, that is, the position of the second hand 2 can be specified by performing 6 times at two step intervals to identify whether or not the other gear is blocking the transmission hole. The effect that it can be obtained.

  According to the second hand wheel 24 of FIG. 3, since all the above first to fourth conditions are satisfied, all of the above actions can be obtained.

  Next, the train wheel mechanism 20 will be described based on the cross-sectional view shown in FIG. 2 and the front views of FIGS. 5 to 7 are front views respectively showing a train wheel mechanism that rotates the second hand, the minute hand, and the hour hand. In FIG. 5 to FIG. 7, the teeth formed on each gear are omitted.

  2, 5 is a dial, 9 is a solar panel of the power supply unit 40, 6 is an upper housing, 7 is a lower housing, 10 is a circuit board, and 14 to 16 are bearing plates that hold the shafts of the gears, 18 is a magnetic-resistant plate that reduces the entry of an external magnetic field, 51 is the first motor that drives the second hand 2, 51 a is the rotor of the first motor 51, 51 b is the stator of the first motor 51, and 52 is the motor that drives the minute hand 3. The second motor 52a is a rotor of the second motor 52, and 52b is a stator of the second motor 52.

  As shown in FIGS. 5 and 2, the second hand wheel 24 is connected to the rotor 51a of the first motor 51 with the fifth wheel & pinion 211 interposed therebetween, and is rotated 6 ° for each rotation of the rotor 51a by one step (180 °). It is configured to rotate one by one. During normal hand movement, the first motor 51 is driven one step per second, so that the second hand 2 and the second hand wheel 24 make one round in 60 seconds.

  As shown in FIGS. 6 and 2, the minute hand wheel 25 is connected to the rotor 52 a of the second motor 52 through the intermediate wheel 26 and the center wheel & pinion 212. Each time the rotor 52a rotates by one step (180 °), the intermediate wheel 26 rotates by 30 ° and the minute hand wheel 25 rotates by 1 °. During normal hand movement, the second motor 52 is driven one step every 10 seconds, so that the minute hand 3 and the minute hand wheel 25 make one round in 60 minutes.

  As shown in FIG. 2, the minute hand wheel 25 is configured to rotate around the same rotation axis as the second hand wheel 24, and as shown in FIG. 6, the first detected portion is located at a radial position that overlaps the detection position P. As a result, one transmission hole 25h is formed. Further, the intermediate wheel 26 is also arranged so as to partially overlap the detection position P, and one transmission hole 26h is formed at a radial position overlapping the detection position P.

  The transmission hole 25h of the minute hand wheel 25 and the transmission hole 26h of the intermediate wheel 26 are assembled so as to overlap at the detection position P at a predetermined step (step of FIG. 6) of the minute hand wheel 25. The minute hand wheel 25 rotates only 1 ° by one step drive of the second motor 52, while the intermediate wheel 26 rotates 30 ° by one step drive of the second motor 52. Therefore, at the timing of one step before and after in FIG. 6, the transmission hole 26h of the intermediate wheel 26 is relatively far from the detection position P, and the transmission hole 25h at the detection position P is closed. (See FIG. 11 (b)).

  The minute hand 3 is assembled at a step position where the transmission holes 25h and 26h of the minute hand wheel 25 and the intermediate wheel 26 overlap at the detection position P so as to indicate a specified time (55 minutes 00 seconds) on the dial. However, there may be a case where an assembly error of about ± 6 ° at the largest and an assembly error of about ± 3 ° at the smallest is added. The 1 ° assembly error of the minute hand 3 corresponds to a displacement of 10 seconds on the minute hand scale on the dial.

  As shown in FIG. 7, the hour hand wheel 27 is connected to the rotor 53a of the third motor 53 through three intermediate wheels 213, 215, 216 and a third wheel & pinion 214, and is one step (180 °) of the rotor 53a. Each rotation is configured to rotate by 1 °. During normal hand movement, the third motor 53 rotates one step every two minutes, so that the hour hand 4 makes one round in 12 hours.

  A detection wheel 217 for detecting the position of the hour hand 4 is connected to the train wheel mechanism of the hour hand 4, and transmission holes 217h, 213h, and 214h are provided in the detection wheel 217, the intermediate wheel 213, and the third wheel & pinion 214, respectively. Is formed. These transmission holes 217h, 213h, and 214h are set to overlap at the second detection position P2 at a specified time for hour hand detection (for example, 11:55, 23:55).

  Next, the operation of the analog electronic timepiece 1 configured as described above will be described.

[Setting data change processing]
FIG. 8 is a flowchart of the setting data changing process executed by the CPU 34, and FIG. 9 is a diagram for explaining the processing contents of the setting data changing process. In FIG. 9, the three sections of the storage area 37a of the RAM 37 are referred to as first to third sections “RAM1” to “RAM3”.

  The setting data changing process in FIG. 8 is started when a predetermined operation input for switching to the time shift function setting mode is performed via the switch unit 44.

  When the process shifts to the setting data change process, first, the CPU 34 performs a setting input process (step S1) of a time for shifting the display time by the time shift function (referred to as “time shift time”). Specifically, the second hand 2 is moved to a position on the dial plate indicating that the time shift time is being set, and the minute hand 3 and the hour hand 4 are moved to the 00:00:00 position. When the input of the switch unit 44 is received and the first operation button is pressed, the minute hand 3 and the hour hand 4 are advanced in the plus direction, and when the second operation button is pressed, the minute hand 3 and the hour hand 4 are advanced in the minus direction. The input is completed when the third operation button is pressed. During this time, the user presses the first and second operation buttons to move the minute hand 3 and the hour hand 4 to a position indicating a desired time shift time, and presses the third operation button to notify the completion of input. When the input is completed, the CPU 34 calculates the time shift time from the amount of movement of the minute hand 3 and the hour hand 4, and returns the second hand 2, the minute hand 3, and the hour hand 4 to a position shifted by the time shift time from the clock time, The setting process in step S1 is completed.

  When the setting process in step S1 is completed, the CPU 34 stores the input time shift time data in the first section “RAM1” (first storage means) of the storage area 37a (step S2). For example, if “0 hour 20 minutes” is set in the direction in which the time shift time advances, data is stored as shown in FIGS.

  Subsequently, the CPU 34 only needs to shift the time for detecting the hand positions of the second hand 2 and the minute hand 3 based on the time shift time of the time shift function and the hand shift amount indicating the magnitude of the assembling error of the minute hand 3. Or the correction value is calculated. Then, the result is stored in the second section “RAM2” of the storage area 37a (step S3). This is the process shown in FIG. 9 (b) → (c).

  Specifically, the time at which the hand position is detected has only to be shifted by the time shift time of the time shift function and the time shift amount of the hand shift amount of the minute hand 3, so in step S3, the CPU 34 stores the storage unit 35a of the EEPROM 35. Then, the data of the hand shift amount of the minute hand 3 is read out, and the time converted value of this hand shift amount is added to the time shift time stored in the first section “RAM1”. Then, the data resulting from the addition is stored in the second section “RAM2” of the storage area 37a.

  In the example of FIG. 9, since the hand shift amount “1 step” corresponds to “+10 seconds” in terms of time, the time converted value “−20 seconds” of the needle shift amount “−2” steps becomes the time shift time “+0”. The time data “0 hour 19 minutes 40 seconds”, which is added to “time 20 minutes” and represents the result, is stored in the second section “RAM2” of the storage area 37a.

  Next, the CPU 34 calculates corrected detection time data representing the actual needle position detection time based on the correction value data of the needle position detection time in the second section “RAM2” of the storage area 37a, and stores this. The data is stored in the third section “RAM3” of the area 37a (steps S4 to S12). For example, the processing is shown in FIG. 9 (c) → (d).

  Here, since the detection time data needs to be a value of minutes and seconds per hour, a conditional branch is performed based on the value of the correction value data in steps S4, S6, S7, and S10, and the calculation formula is changed. ing.

  That is, first, it is determined whether the minute digit and second digit values of the correction value data in the second section “RAM2” are both “0” (step S4). Since the detection time does not change from a predetermined detection reference time (55:00 hours per hour), “55 minutes 00 seconds” is stored as corrected detection time data in the third section “RAM3” of the storage area 37a ( Step S5).

  On the other hand, if the determination result in step S4 is “No”, then the sign of the correction value data in the second section “RAM2” is determined (step S6). It is determined whether or not the value is equal to or less than 55 minutes (step S7). If negative, it is further determined whether or not the absolute value of the minute / second digit is smaller than 5 minutes (step S10).

  As a result, if the correction value data in the second section “RAM2” is positive and the value of the minute / second digit is 55 minutes or less, the value of the minute / second digit is subtracted from the detection reference time (55 minutes 00 seconds). Is detected (step S8). Further, if the time data of the second section “RAM2” is positive and the minute / second digit value is larger than 55 minutes, it is 60 at the detection reference time (55 minutes 00 seconds) so that the calculation result does not become a negative value. After adding the minutes, the value of the minute / second digit is subtracted to obtain corrected detection time data (step S9).

  In addition, if the correction value data in the second section “RAM2” is negative and the absolute value of the minute / second digit is smaller than 5 minutes, the absolute value of the minute / second digit is added to the detection reference time (55:00) to correct it. Later detection time data is obtained (step S11). Further, if the time data of the second section “RAM2” is negative and the absolute value of the minute / second digit is a value of 5 minutes or more, the detection reference time (55 minutes 00 seconds) is set so that the calculation result does not become a value of 60 minutes or more. ) Is added to the minute digit value, and then 60 minutes are subtracted to obtain corrected detection time data (step S12).

  When the corrected detection time data is obtained in each of steps S8, S9, S11, and S12, the corrected detection time data is stored in the third section “RAM3” of the storage area 37a in these steps. Then, the setting data change process is terminated. The detection time changing means is configured by software that executes the processes of steps S2 to S12.

  By this setting data change processing, the time shift time data of the time shift function and the hand position detection time data for starting the hand position detection of the second hand 2 and the minute hand 3 are stored in the storage area 37 a of the RAM 37.

[First pointer control processing]
FIG. 10 shows a flowchart of the first pointer control process started based on the input of the 1 second signal. In addition, FIGS. 11 to 13 are explanatory diagrams showing a clock state for a certain period before and after the hand position detection time. 11 shows a case where the needle shift amount is “0”, FIG. 12 shows a case where the needle shift amount is “+1”, and FIG. 13 shows a case where the needle shift amount is “−1”. .

  The first pointer control process is a process of moving the second hand 2 and the minute hand 3 and detecting the hand position, and is repeatedly executed at a cycle of 1 second based on the input of the 1 second signal. When the 1-second signal Sg1 is input from the frequency dividing circuit 39 and the first hand control process is started, first, the CPU 34 outputs a signal to the first motor 51 to move the second hand 2 by one step (step) S21), the value of the predetermined area of the RAM 37 where the second hand position is counted is updated by “+1” (step S22).

  Subsequently, a flag F indicating whether or not the timing is during the detection of the needle position is confirmed, and a value “1” indicating that the timing is during the detection of the needle position or a value indicating that the timing is not during the detection of the needle position. It is determined whether it is “0” (step S23).

  As a result, if the value is “0” which is not the timing during the needle position detection, the process proceeds to “Yes”, and it is determined whether the current time coincides with the needle position detection time (step S24). Specifically, the value of the minute / second digit of the time counting circuit 47 is compared with the value stored in the third section “RAM3” of the storage area 37a of the RAM 37 to determine whether or not they match.

  If the current time does not coincide with the hand position detection time, the process branches to “No”, and it is determined whether the current time is a time in units of 10 seconds (step S25). If the time is not in units of 10 seconds, the first pointer control process is terminated as it is, while if the time is in units of 10 seconds, a signal is output to the second motor 52 to move the minute hand 3 by one step (step S26). Further, the value of the predetermined area of the RAM 37 where the minute hand position is counted is updated by “+1” (step S27). Then, the first pointer control process is terminated.

  That is, the processing related to the second hand 2 (steps S21 and S22) is performed at the timing when only the second hand 2 needs to be moved by the processing of the series of steps described above, and the operation timing of the minute hand 3 in units of 10 seconds is added. Thus, processing related to the movement of the minute hand 3 (steps S26 and S27) is performed.

  On the other hand, if it is determined in step S24 that the current time coincides with the needle position detection time, initial setting processing for detecting the needle position is performed in steps S28 to S30.

  Here, the hand position detection processing of the second hand 2 and the minute hand 3 will be described. As shown in the explanatory diagram of FIG. 11, the transmission holes 25h and 26h of the minute hand wheel 25 and the intermediate wheel 26 overlap the detection position P at the hand position detection time ("55:00" in FIG. 11), and 10 seconds later. With the one-step movement, the transmission hole 26h of the intermediate wheel 26 moves greatly, and the overlap of the transmission holes 25h and 26h is closed.

  Further, during the 10 seconds when the transmission holes 25h and 26h are overlapped with the detection position P, the second hand wheel 24 rotates by 10 steps, and any of the transmission holes 24h1 to 24h7 is at the detection position P during this rotation period. Overlapping conditions appear. Therefore, during this time, for each two-step movement of the second hand 2, the first detection unit 31 is operated to detect whether or not the transmission hole is overlapped at the detection position P. Then, the presence / absence of displacement of the second hand 2 and the minute hand 3 is confirmed by a pattern of presence / absence of transmission holes (called a hole pattern) obtained by five detection processes at intervals of two steps.

  Here, the detection process is performed for each two-step movement of the second hand 2 for the following reason. The first motor 51 is a stepping motor having a rotor and a stator each having two poles. When a positive drive pulse is supplied, the rotor rotates from 0 ° to 180 ° and a negative drive pulse is supplied. The rotor rotates from 180 ° to 360 °. Then, the positive driving pulse and the negative driving pulse are alternately supplied, so that the rotor rotates in one direction every half rotation. For this reason, even if the minute hand 3 or the hour hand 4 is displaced due to a strong magnetic field or a strong impact, the positional displacement does not remain in odd steps after that, and the positional displacement always remains in even steps. Therefore, the detection process is performed every two steps of movement.

  When the second hand 2 and the minute hand 3 are not misaligned, the hole pattern obtained by the five detection processes from the hand position detection time differs depending on the second digit value of the hand position detection time. For example, as shown in FIG. 11, if the hand position detection time is “55:00”, the position of the “00”-“08” step of the second hand wheel 24 at the timing of five detection processes (FIG. 3, As shown in FIG. 11D, the detected hole pattern is “10011 (“ 1 ”has a hole and“ 0 ”has no hole).

  As shown in FIG. 12, if the hand position detection time is “54 minutes 50 seconds”, the position of the “50”-“58” step of the second hand wheel 24 at the timing of the five detection processes (FIG. 3, FIG. 3). 4) comes to the detection position P, and the detected hole pattern is “00110” as shown in FIG. As shown in FIG. 13, if the hand position detection time is “55 minutes 10 seconds”, the position of the “10”-“18” step of the second hand wheel 24 at the timing of the five detection processes (FIG. 3, FIG. 3). 4) comes to the detection position P, and the detected hole pattern is “11101” as shown in FIG.

  In the analog electronic timepiece 1 of this embodiment, the hand position detection time is shifted in units of minutes by the time shift function, and is shifted in units of 10 seconds for each step of the hand shift amount representing the assembly error of the minute hand 3. Therefore, the second digit value of the hand position detection time is one of six types of 00 seconds, 10 seconds, 20 seconds, 30 seconds, 40 seconds, and 50 seconds. Accordingly, the hole pattern detected by the above five detection processes is represented by the “00”-“08” step, “10”-“18” step, “20”-“28” represented by the brackets at the bottom of the table of FIG. The hole pattern is one of “step”, “30”-“38” step, “40”-“48” step, and “50”-“58” step. Which hole pattern is used is determined according to the second digit value of the hand position detection time.

  Therefore, if the hole pattern corresponding to the second digit value of the hand position detection time is detected by performing the above five detection processes, it can be determined that the second hand 2 and the minute hand 3 are not misaligned. If this hole pattern is not detected, it can be determined that the second hand 2 has a positional deviation or the minute hand 3 has a positional deviation. The above is the principle of the hand position detection process for the second hand 2 and the minute hand 3.

  In the initialization processing of the needle position detection in steps 28 to S30 in FIG. 10, in order to realize the above-described needle position detection processing, first, a value “1” indicating that the timing is during needle position detection in the flag F. "Is set (step S28), then, as a reference pattern, a hole pattern to be detected in five detection processes from the needle position detection time is selected and set in variables A0 to A4 (step S29: reference pattern). Selection means). This hole pattern is selected from five hole patterns with a two-step interval starting from the second digit step of the needle position detection time from the hole pattern data table (data in FIG. 4) in the storage unit 36a of the ROM 36. This is done by reading the presence / absence value. The needle position detection control means is configured by software for executing the processes of steps S24 and S28.

  Further, in order to perform five detection processes at intervals of two steps of the second hand 2 from the hand position detection time, an initial value “0” is substituted into a variable i indicating the number of detection processes (step S30).

  When the initialization processing for the needle position detection is performed, since the current time is the needle position detection time and the timing for performing the first detection processing, the process proceeds to steps S33 to S36 for executing the detection processing. To do. First, the first detection unit 31 is operated to detect whether the light of the light emitting unit 311 is received by the optical sensor 312 through the transmission holes 35h, 36h, and 24h (any one of 24h1 to 24h7), and as a result. Is discriminated (step S33). Subsequently, a value representing this result is substituted into a variable Bi corresponding to the current detection count i among the variables B0 to B4 (steps S34 and S35). Further, the value of the variable Bi is compared with the value Ai corresponding to the current detection number i among the hole patterns A0 to A4 to be detected, and it is determined whether or not they match (step S36).

  Here, if the second hand 2 and the minute hand 3 are not misaligned, a matching result should be obtained. Therefore, if it is determined that there is a mismatch, it is assumed that there is a misalignment, and a hand position correcting process for correcting this misalignment. The process proceeds to (needle position correcting means).

  On the other hand, if the result of determination in step S36 is a match, the value of the variable i is checked to see if five detection processes have been completed, and if not yet, if the five detection processes have been completed, A value “0” indicating that the timing is not during detection of the hand position is set in F (step S39), and the process proceeds to step S25 (step related to the movement of the minute hand 3). The processing after step S25 is as described above.

  Further, when the first pointer control process is started by inputting a 1 second signal at the timing when 1 second, 3 seconds, 5 seconds, and 7 seconds have elapsed from the needle position detection time, the value of the flag F is determined in the determination process of step S23. Since it is set to “1”, the process proceeds to “No”, and it is determined whether or not the current time is even seconds (step S31). Then, since the current clocking time is an odd number of seconds, the process proceeds to the “No” side, and the process proceeds to step S25 (step related to the movement of the minute hand 3). That is, according to the discrimination processing in steps S23 and S31, the detection processing is omitted at an odd second timing in the period of 8 seconds from the hand position detection time.

  When the first pointer control process is started at the timing when 2 seconds, 4 seconds, 6 seconds, and 8 seconds have elapsed from the needle position detection time, the value of the flag F is set to “1” in the determination process of step S23. As a result, the process proceeds to the “No” side, and the process proceeds to the “Yes” side since the current time measurement is an even number of seconds in the determination process of step S31. Thereby, the CPU 34 updates the variable i representing the number of detections by “+1” (step S32), and then proceeds to step S33 to execute the detection process.

  That is, by the processing of steps S23, S31, and S32, detection processing is performed at an even-numbered second timing within a period of 8 seconds from the hand position detection time, and the detection number variable i is also updated. .

  Then, the detection process (steps S33 to S34) is performed five times at two-step intervals from the needle position detection time, and if the detection results B0 to A4 of the total number of detections coincide with the hole patterns A0 to A4 to be detected ( In step S36, “Yes”), it is determined that there is no positional deviation between the second hand 2 and the minute hand 3, and after the fifth detection process, the value of the flag F indicating the timing of the hand position detection is set to “0”. After returning (step S38), the normal hand movement process is continued.

  On the other hand, if the detection result Bi of a certain number of detections i does not match the value Ai of the number of times corresponding to the hole patterns A0 to A4 to be detected during the five detection processes (steps S33 to S34) (in step S36). “No”), it is determined that the second hand 2 or the minute hand 3 is misaligned, and the routine proceeds to a hand position correction process (needle position correcting means).

[Second pointer control process]
FIG. 14 shows a flowchart of the second pointer control process started based on the input of the binary signal.

  The second pointer control process is a process related to the movement of the hour hand 4 and the detection of the hand position, and is executed at a cycle of 2 minutes when the 2-minute signal Sg2 is input from the time counting circuit 47. When the second minute signal Sg2 is input and the second pointer control process is started, first, the CPU 34 outputs a signal to the third motor 53 to move the hour hand 4 by one step (step S41), and the hour hand position is counted. The value of the predetermined area of the RAM 37 is updated by “+1” (step S42).

  Subsequently, the CPU 34 determines whether or not the current timing time is the hand position detection time of the hour hand 4 (step S43). The hour hand 4 also indicates the display time shifted from the time measured by the time counting circuit 47 in accordance with the time shift time of the time shift function. In addition, the hand position detection time of the hour hand 4 is a time when the transmission hole 217h of the detection wheel 217 (see FIG. 7) should overlap the second detection position P2, and the hour hand 4 is at a specified time (11:55 on the dial). Minute), the transmission hole 217h is assembled so as to overlap the second detection position P2. Therefore, in step S43, whether the time obtained by subtracting the time shift time stored in the first section “RAM1” of the storage area 37a of the RAM 37 from the current clock time matches the specified time (11:55). By determining whether or not, it is determined whether or not it is the hand position detection time of the hour hand 4.

  If the result of the discrimination process in step S43 is not coincident, the second pointer control process is terminated as it is. If the result of the discrimination process is coincident, the hour hand 4 is detected (step S44). Specifically, the second detection unit 32 is operated to detect whether the light of the light emitting unit 321 is received by the optical sensor 322 through the transmission holes 213h, 214h, and 217h, and the result is determined. As a result, if light is detected (having a hole), it is determined that there is no positional deviation in the hour hand 4, and the second pointer control process is terminated as it is.

  On the other hand, if no light is detected (no hole) as a result of the determination process in step S44, it is determined that the hour hand 4 is misaligned, and the needle position correction process (needle position correction) for correcting the position of the hour hand 4 is performed. Move to (Means).

[Needle position correction processing]
Although details of the hand position correction process are omitted, for example, when the positional deviation of the hour hand 4 is confirmed, the hand position of the hour hand 4 is corrected as follows. That is, the process of operating the second detection unit 32 every time the hour hand 4 is moved one step is repeated until the state where the transmission holes 213h, 214h, and 217h overlap at the second detection position P2 is detected. This state is always generated while the hour hand 4 is moving 360 steps (one rotation). When this state is detected, the position of the hour hand 4 at that time indicates the specified time (11:55) on the dial. Judged to be at the position indicated. Then, the value of a predetermined area where the position of the hour hand 4 is counted in the RAM 37 is corrected to a corresponding value.

  Further, the hour hand 4 is fast-forwarded from the time measured by the time counting circuit 47 to the time position obtained by adding the time shift amount stored in the first section “RAM1” of the storage area 37a to correct the hand position of the hour hand 4. Complete. Then, the process returns to the normal hand movement process. By such a hand position correction process of the hour hand 4, the hour hand 4 indicates the time position shifted by the time shift time set by the time shift function.

  When the displacement of the second hand 2 or the minute hand 3 is confirmed, the hand positions of the second hand 2 and the minute hand 3 are corrected as follows. That is, first, the second hand wheel 24 is rotated by 12 steps, and the first detection unit 31 is operated every two steps of rotation (every even number of steps), thereby obtaining six detection results indicating whether or not there is a transmission hole. As shown in FIG. 4, the hole pattern of the second hand wheel 24 is designed such that five consecutive hole patterns at two-step intervals have different patterns by changing the start positions. Also, the design is such that there are no locations where all of the six consecutive hole patterns are “0” with no holes at intervals of two steps.

  Therefore, if the six detection results are not all “0”, it can be determined that the transmission holes 25h and 26h of the minute hand wheel 25 and the intermediate wheel 26 are overlapped at the detection position P. The current positions of the second hand wheel 24 and the second hand 2 can be determined by collating the five consecutive hole patterns with the hole pattern data table in the storage unit 36a.

  On the other hand, if the six detection results are all “0” without holes, it can be determined that the transmission holes 25h and 26h of the minute hand wheel 25 and the intermediate wheel 26 do not overlap at the detection position P. Therefore, this time, the process of operating the first detection unit 31 each time the minute hand 3 is moved one step is repeated to search for a state in which the transmission holes 25h and 26h overlap at the detection position P. Here, if the transmission hole of the second hand wheel 24 is overlapped with the detection position P, this state always occurs while the minute hand 3 is moved 360 steps (one rotation), so when this state is detected, It is determined that the position of the minute hand 3 at that time is at a position shifted from the specified time (55:00 00) on the dial plate by the needle shift amount of the storage unit 35a.

  On the other hand, if the transmission hole cannot be detected even if the minute hand 3 is rotated once, it can be determined that the second hand wheel 24 is blocking the transmission hole at the detection position P. First, the second hand wheel 24 is rotated 30 steps 180 degrees. . Since the formation pattern of the transmission holes 24h1 to 24h7 of the second hand wheel 24 is such that there is a hole on the opposite side of 180 ° from the portion without the hole, this operation causes the transmission hole 24h1 of the second hand wheel 24 to be at the detection position P. ˜24h7 is overlapped.

  Accordingly, in this state, the process of operating the first detection unit 31 every time the minute hand 3 is moved one step is repeated to search for a state in which the transmission holes 25h and 26h overlap at the detection position P. Based on the detection of this state, the position of the minute hand 3 is determined.

  Further, when it is detected that the transmission holes 25h and 26h of the minute hand wheel 25 and the intermediate wheel 26 overlap at the detection position P, the second hand wheel 24 is rotated by 12 steps or 10 steps and the first detection unit 31 is rotated by 2 steps. It is operated every time (every even step), the hole pattern of the second hand wheel 24 is acquired, and the positions of the second hand wheel 24 and the second hand 2 are determined as described above.

  When the positions of the second hand 2 and the minute hand 3 are determined as described above, the value in a predetermined area of the RAM 37 that counts the positions of the second hand 2 and the minute hand 3 is corrected to a corresponding value. Further, the second hand 2 is moved to the position of the second digit value of the current timekeeping time, and the minute hand 3 is moved from the current timekeeping time to the minute / second digit indicated in the correction value data of the second section “RAM2” of the storage area 37a. Is fast-forwarded to the time position, and the hand position correction of the second hand 2 and the minute hand 3 is completed.

  When the hand position correction process is completed, the process returns to the normal hand movement process. By such a hand position correction process of the second hand 2 and the minute hand 3, the second hand 2 and the minute hand 3 indicate the time positions shifted by the time shift time set by the time shift function.

  As described above, according to the analog electronic timepiece 1 of this embodiment, the data of the hand shift amount specifying the assembly error of the minute hand 3 is stored in the storage unit 35a of the EEPROM 35, and the data of the time shift time of the time shift function. Is stored in the first section of the storage area 37 a of the RAM 37. Further, in the first pointer control process, the detection time for starting the hand position detection of the second hand 2 and the minute hand 3 is changed to a detection time that takes into account both the hand shift amount and the time shift time. Therefore, even when the display time is shifted by the time shift function and there is an assembly error of the minute hand 3, the hand position detection process can be normally performed.

  Further, in the analog electronic timepiece 1 of this embodiment, the minute hand 3 in which the assembling error is most conspicuous is targeted as an indicator that can deal with the assembling error of the indicator by internal adjustment. That is, since the minute hand 3 has a small rotation angle in one step and has a length that reaches the scale of the dial plate, for example, when the minute hand 3 is assembled with a deviation of “−2 °”, When the time of the clock is “00:00” and the second hand 2 points to the 12 o'clock position on the dial, the minute hand 3 is shifted by “−2 °” from the 12 o'clock scale on the dial. Be recognized. On the other hand, when the time of the clock is “00 minutes 20 seconds” and the second hand 2 points to the 12 o'clock position on the dial, it is recognized that the minute hand 3 has just overlapped the 12 o'clock scale on the dial. . Since these states can be compared, the assembly error of the minute hand 3 is conspicuous. Therefore, by making it possible to internally adjust the assembling error of the minute hand 3, the accuracy required for the assembling process of the pointer can be remarkably reduced.

  Further, in the analog electronic timepiece 1 of this embodiment, a transmission hole formed in a gear (second hand wheel 24, minute hand wheel 25, intermediate wheel 26, detection wheel 217) rotating in conjunction with the hands 2 to 4 is provided with a light emitting unit. It has a precondition that the positions of the pointers 2 to 4 are detected by being detected by 311 and 321 and the optical sensors 312 and 322. Therefore, when there is an assembly error of the minute hand 3, the display time on the dial plate where the transmission holes 25 h and 26 h of the minute hand wheel 25 and the intermediate wheel 26 overlap at the detection position P is set to a preset specified time (hourly It will shift from 55:00. Therefore, in the analog electronic timepiece having such a premise configuration, the above configuration for changing the hand position detection time is particularly effective.

  Further, in the analog electronic timepiece 1 of this embodiment, the hole pattern detected while the second hand wheel 24 moves a plurality of steps is compared with the values A0 to A4 of the hole pattern to be detected (FIG. 10). In step S36), it is determined whether the second hand 2 and the minute hand 3 are misaligned. Further, the hole pattern values A0 to A4 to be detected are appropriately selected according to the change of the needle position detection time (see step S29 in FIG. 10). Therefore, even if the needle position detection time is changed as described above, normal needle position detection processing can be performed.

  In addition, the change of the hand position detection time is changed from a preset time (a hand position detection time when there is no assembly error of the minute hand 3 or use of the time shift function), a time shift time of the time shift function, Since it is obtained by shifting both the time shift value of the needle shift amount related to the assembly error of the minute hand 3, the timing at which the minute hand wheel 25, the intermediate wheel 26, and the second hand wheel 24 come to the detection position is surely corrected. It can be set as the subsequent needle position detection time.

  Further, the time counting circuit 47 counts the current time, and based on the time counted by the time counting circuit, the timing of the hand position detection is determined, and the time display shifted by the time shift function is controlled. Since the reference current time is always kept in the time counting circuit, there is no need to make any changes to the timekeeping process as a base or the time correction process by receiving a standard radio wave, Standard algorithms can be applied.

  The present invention is not limited to the above-described embodiment, and various modifications can be made. For example, in the above embodiment, only the minute hand 3 is stored in the assembling process of the pointer, and the amount of displacement of the mounting position is stored and used to change the hand position detection time. Similarly, the second hand 2 and the hour hand 4 When an assembly error occurs, the amount of displacement of the attachment positions may be stored and used to adjust the needle position detection time.

  In the above embodiment, the time shift time of the time shift function can be set in units of minutes, but may be configured to be set in units of 10 seconds, for example. In the above embodiment, the first to third sections “RAM1” to “RAM3” are provided as the shift time information stored in the storage area 37a of the RAM 37, and the data of the time shift time set by the time shift function is provided. The needle position detection time correction value data including the needle shift amount and the corrected needle position detection time data are stored separately, but only one of the data is stored, and the remaining two data May be obtained by calculation from one stored data when necessary.

  In the above embodiment, the example in which the present invention is applied to a configuration in which the minute hand 3 and the hour hand 4 are independently driven has been described. However, the present invention is similarly applied to a configuration in which the minute hand 3 and the hour hand 4 are driven in conjunction with each other. be able to. In addition, the detailed structure and the detailed method shown in the embodiment can be appropriately changed without departing from the spirit of the invention.

DESCRIPTION OF SYMBOLS 1 Analog electronic timepiece 2 Second hand 3 Minute hand 4 Hour hand 24 Second hand wheel 24h1-24h7 Transmission hole 25 Minute hand wheel 25h Transmission hole 26 Intermediate wheel 26h Transmission hole 27 Hour hand wheel 31 1st detection part 32 2nd detection part 34 CPU
35 EEPROM
35a Needle shift amount data storage unit 36 ROM
36a Hole pattern data table storage unit 37 RAM
37a Shift time information storage unit 47 Time counting circuit 51 First motor 52 Second motor 53 Third motor 217 Detection wheel 217h Transmission hole 311 Light emitting unit 312 Optical sensor 321 Light emitting unit 322 Optical sensor

Claims (6)

First pointer display control means for displaying the current time with a pointer;
Needle position detecting means for detecting whether or not the pointer is at a predetermined inspection position;
Needle position detection control means for operating the needle position detection means at a predetermined detection time;
A needle position correcting means for correcting the position of the pointer when the needle position detecting means detects that the pointer is not in the inspection position;
In an analog electronic watch with
First storage means for storing information on the time to shift the pointer in the direction to advance or delay;
Second storage means for storing information on the displacement amount of the attachment position of the pointer;
Second pointer display control means for displaying, by the pointer, a time shifted from the current time by the time stored in the first storage means;
Detection time changing means for changing the detection time from a predetermined detection reference time based on information stored in the first storage means and the second storage means;
Equipped with a,
The pointer includes a second hand and a minute hand,
The needle position detecting means includes
The overlapping state of the first detected part formed on the minute hand gear rotating in conjunction with the minute hand and the second detected part formed on the second hand gear rotating in conjunction with the second hand is indicated by the minute hand gear. It is configured to detect whether the second hand and the minute hand are at a predetermined inspection position by detecting over a period when the second hand gear is stopped and rotating a plurality of steps, and comparing the detection pattern with a predetermined reference pattern,
further,
An analog electronic timepiece comprising reference pattern selection means for selecting the reference pattern based on at least information stored in the second storage means . 2. The analog electronic timepiece according to claim 1, wherein the second storage means stores information on an amount of deviation of an attachment position of the minute hand. A gear having a part to be detected and rotating in conjunction with the pointer,
The needle position detecting means includes
It has a light emitting part and a light receiving part, and detects whether or not the detected part is in a predetermined position by irradiating light from the light emitting part to the gear to determine the light receiving state of the light receiving part, 3. The analog electronic timepiece according to claim 1, wherein the timepiece is configured to determine whether or not the pointer is at an inspection position based on the detection. The detection time changing means includes
The detection time is shifted from the detection reference time by both the time stored in the first storage unit and the time corresponding to the deviation amount of the pointer stored in the second storage unit. 4. The analog electronic timepiece according to claim 1, wherein the time is changed to a new time. It has timekeeping means to keep time,
The analog electronic timepiece according to any one of claims 1 to 4, wherein the current time is a time measured by the time measuring means. First pointer display control means for displaying the current time with a pointer;
Needle position detecting means for detecting whether or not the pointer is at a predetermined inspection position;
Needle position detection control means for operating the needle position detection means at a predetermined detection time;
A needle position correcting means for correcting the position of the pointer when the needle position detecting means detects that the pointer is not in the inspection position;
In an analog electronic watch with
First storage means for storing information on the time to shift the pointer in the direction to advance or delay;
Second storage means for storing information on the displacement amount of the attachment position of the pointer;
Second pointer display control means for displaying, by the pointer, a time shifted from the current time by the time stored in the first storage means;
Detection time changing means for changing the detection time from a predetermined detection reference time based on information stored in the first storage means and the second storage means;
Equipped with a,
The pointer includes a second hand and a minute hand,
The needle position detecting means includes
The overlapping state of the first detected part formed on the minute hand gear rotating in conjunction with the minute hand and the second detected part formed on the second hand gear rotating in conjunction with the second hand is indicated by the minute hand gear. It is detected over a period in which the second hand gear stops and rotates a plurality of steps, and the detection pattern is compared with a predetermined reference pattern to determine whether or not the second hand and the minute hand are at a predetermined inspection position. A featured analog electronic watch.

Images