JP6495133B2 - Electronic clock with position detection function - Google Patents

Description

  The present invention relates to an electronic timepiece with a position detection function that detects a shift of a pointer and automatically corrects it.

  An analog electronic timepiece such as a wristwatch can visually recognize the current time according to the rotational positions of the hour hand, the minute hand, and the second hand, which are time hands. By the way, in such an analog electronic timepiece, for example, when an impact is applied, the step motor which is an internal drive motor cannot rotate in a predetermined step, and rotates a plurality of steps in either direction. ) May deviate from the reference time information timed by the electronic circuit inside the watch, resulting in a problem that the time display is distorted.

  For this reason, conventionally, there has been proposed an electronic timepiece including an optical pointer position detecting means for detecting whether or not the pointer position is shifted at a predetermined cycle (for example, refer to Patent Document 1). The analog electronic timepiece of Patent Document 1 has an optical pointer position detection means using an LED and a phototransistor. When the pointer position detection fails, the pointer position detection cycle is changed from the first detection cycle (60 seconds) to the second. Detection period changing means for changing the detection period to 1 second (1 second).

  It is counted every time the pointer is driven, and is reset every time the pointer position is detected before the change to the second detection period, and after changing from the first detection period to the second detection period, it is counted until the pointer position is successfully detected. Has a counter to continue. Further, the difference between the count value of the counter and the first detection period at the time of successful detection of the pointer position after the change from the first detection period to the second detection period is calculated, and the position of the pointer position is calculated based on the difference value. There is provided a pointer position correction amount calculation means for determining a correction condition and instructing the correction condition to the pointer drive means control section.

  The detection of the pointer position defines a detection time for operating the LED and the phototransistor in order to reduce power consumption and prevent malfunction due to noise.

  With the above configuration, since the pointer position deviation is detected in natural normal hand movement (1 second hand movement), even when the pointer position is being detected, the watch user is not distrusted by the pointer operation. It is shown that it has.

Japanese Patent No. 5049263 (page 9, FIG. 1)

  Here, as electronic functions in recent years have become more multifunctional, there has been an increasing demand for lower power consumption, and optical pointer position detection means are also required to have further lower power consumption. For this reason, the detection time (drive time of the position detection means) for operating the optical pointer position detection means is set to the shortest detectable time, and the required low power consumption is realized.

However, when the electronic timepiece is placed in a low temperature environment, a phenomenon such as an increase in the ON resistance of the transistor occurs due to the temperature characteristics of the MOS-IC constituting the timepiece circuit. The start-up time of the drive circuit that drives the LED or phototransistor becomes long. As a result, as described above, if the detection time (driving time) of the optical pointer position detection means is set short to reduce power consumption, the pointer position detection means cannot operate in a low temperature environment, and the pointer detection is normal. There are issues that cannot be implemented. This problem will be described below with reference to the drawings.

[Schematic Description of Position Detection Device of Patent Document 1: FIG. 11]
FIG. 11 is a schematic circuit diagram of a position detection device for an analog electronic timepiece disclosed in Patent Document 1 of a conventional example. In FIG. 11, the conventional position detection apparatus 100 includes a light emitting unit 110 and a light receiving unit 120. The light emitting unit 110 includes a first comparator CP1, an N channel MOS transistor (hereinafter abbreviated as Nch transistor) TN1, an LED 111 as a light emitting element, and a resistor R1. Further, the detection light Lt (arrow) is emitted from the LED 111.

  The light receiving unit 120 includes a phototransistor 121 as a light receiving element, a second comparator CP2, a resistor R2, and a P channel MOS transistor (hereinafter abbreviated as a Pch transistor) TP2.

  A reference voltage VRF from a constant voltage circuit (not shown) is connected to the first comparator CP1 of the light emitting unit 110 and the second comparator CP2 of the light receiving unit 120.

  The first comparator CP1 of the light emitting unit 110 controls the drive current Id flowing through the LED 111 to be a constant current, and the second comparator CP2 of the light receiving unit 120 compares the detection result by the phototransistor 121 to compare the pointer position detection signal. Output VO.

  The enable signal ENB is input to the enable terminal E of the first comparator CP1 of the light emitting unit 110, the enable terminal E of the second comparator CP2 of the light receiving unit 120, and the gate G of the P transistor TP2 of the light receiving unit 120. Only when the enable signal ENB becomes active (L level), the light emitting unit 110 and the light receiving unit 120 are activated and operated to reduce power consumption.

  However, if the active time of the enable signal ENB, that is, the detection time of the position detection device 100 is shortened in order to reduce the power consumption of the position detection device 100, as described above, the startup time of the LED 111 and the phototransistor 121 becomes longer at a low temperature. Therefore, a problem that the pointer detection cannot be normally performed occurs.

[Description of Operation of Position Detection Device of Patent Document 1: FIG. 12 (a)]
FIG. 12A is a timing chart for explaining the operation of the position detection device 100 of Patent Document 1. An electronic timepiece incorporating the position detection device 100 is placed in a low temperature environment of −10 ° C. as an example. The operation example of the position detection apparatus 100 is shown. The configuration of the position detection device 100 is referred to FIG.

  In FIG. 12A, when the enable signal ENB having a pulse width of 1.5 mS becomes active at a predetermined timing to detect the position of the pointer, for example, the first comparator CP1 of the light emitting unit 110 is activated, The operation is started so that a constant current based on the reference voltage VRF flows through the LED 111. As a result, the drive voltage VAK is applied between the anode and the cathode of the LED 111, and the drive current Id flows out to the LED 111.

  However, when the ambient temperature is −10 ° C., the ON resistance of the transistor increases due to the temperature characteristics of the MOS transistors constituting the position detection device 100, and the rise of the drive voltage VAK applied to the LED 111 is slow as shown in the figure. Thus, the detection time ends when the drive voltage VAK reaches a normal value.

For this reason, the emission time of the detection light Lt from the LED 111 is significantly shorter than the detection time (1.5 mS), and the light receiving unit 120 that receives the detection light Lt also has a long startup time due to low temperature. As a result, the pointer position detection signal VO does not become a normal pulse signal as shown by the dotted ellipse, the pulse width is narrow, the crest value is small, and the pointer detection is likely to malfunction. .

  As described above, in the prior art, if the detection time (operation time) for detecting the pointer position is shortened due to the demand for low power consumption of the electronic timepiece, the pointer position detecting means does not function at a low temperature, and external impacts, etc. Therefore, even if the position of the pointer is displaced, there is a problem that the displacement of the pointer cannot be detected at a low temperature. In particular, when the electronic watch is a wristwatch, the wristwatch user moves to various environments. Therefore, the malfunction of the pointer position detecting means at low temperatures greatly impairs the reliability of the watch, which is a big problem. is there. FIG. 12B shows an operation example according to the present invention, which is described for comparison with the conventional example, but will be described later.

  An object of the present invention is to provide an electronic timepiece with a position detection function that solves the above-described problems and realizes accurate hand position detection without being affected by environmental temperature.

  In order to solve the above problems, the electronic timepiece with position detection function of the present invention employs the following configuration.

An electronic timepiece with a position detection function according to the present invention includes a position detection device that detects the position of a display member such as a hand, a temperature detection unit that detects a temperature, and a position detection device based on a measured temperature detected by the temperature detection unit. And a control means for changing the control of the position detecting device , and the control means compares the measured temperature with a predetermined value set in advance, and determines the driving time of the position detection device when the measured temperature is determined to be lower than the predetermined value. It is longer than that at normal temperature, or the driving of the position detection device is stopped .

  The electronic timepiece with a position detection function according to the present invention makes it possible to perform high-performance hand position detection with a wide operating temperature range by changing the control over the position detection device based on the measured temperature. Can be provided.

  Further, the control means changes the control for the position detection device based on a comparison result between the measured temperature and a predetermined value set in advance.

  Thereby, since control with respect to a position detection apparatus is changed based on the preset predetermined value, the change of control with respect to environmental temperature can be implemented with high precision. Moreover, the environmental temperature which changes control can be changed arbitrarily by changing a predetermined value.

  The position detecting device is an optical position detecting device having a position detecting unit having a light emitting unit, a light receiving unit for detecting light from the light emitting unit, and a driving unit for driving the position detecting unit. It is characterized by.

  Thereby, the electronic timepiece with a position detection function excellent in reliability can be provided by using the optical position detection device.

  The control means is characterized in that when the measured temperature is determined to be lower than a predetermined value, the drive time of the drive means is made longer than that at normal temperature.

  As a result, even if the start-up time of the drive means becomes long at low temperatures, it is possible to accurately detect the pointer position by extending the drive time (detection time) of the drive means, and the electronic timepiece with a position detection function having excellent reliability. Can provide.

Further, the control means stops driving the drive means when the measured temperature is determined to be lower than a predetermined value.

  Thus, by stopping the pointer position detection operation at a low temperature, it is possible to prevent an erroneous operation of the pointer position detection that may occur due to the low temperature.

  Further, it has constant voltage output means that operates only during the driving time and outputs a constant voltage, and the driving means is driven using the constant voltage.

  As a result, the constant voltage output means can be reduced in power consumption, and the driving means is driven based on the constant voltage, so that stable pointer position detection can be realized without being affected by fluctuations in the power supply voltage.

  Further, the temperature detection result of the temperature detection means is also used for controlling a function that requires temperature information other than the position detection function.

  Thus, by providing the temperature detection result from the temperature detection means to other functions that require temperature information, it is possible to prevent circuit redundancy and increase the circuit scale without increasing the circuit scale. Can be configured.

  Further, the temperature detection result of the temperature detecting means is used for temperature compensation of the time measuring circuit.

  As a result, the temperature detection result from the temperature detection means is shared by the position detection control means and the temperature compensation means of the timing circuit, thereby preventing circuit redundancy and adding a temperature compensation function without increasing the circuit scale. An electronic timepiece with a position detection function can be provided.

  Further, the temperature detection cycle of the temperature detection means and the temperature compensation cycle of the time measuring circuit are the same.

  Thus, by making the temperature detection cycle and the temperature compensation cycle the same, it is possible to combine the temperature detection means and the accompanying control means as one configuration, and the position detection control means and the temperature compensation means have the same timing. Low power consumption can be realized.

  Further, the present invention is characterized by having a secondary battery as a power source and charge control means for performing charge control of the secondary battery, and using the measured temperature also for charge control of the charge control means.

  This allows the position detection control means and the charge control means to share the measured temperature from the temperature detection means, thereby preventing redundancy of the circuit and increasing the circuit scale without adding a position control function. An electronic watch can be provided.

  Further, the charge control means has a temperature detection means.

  Thereby, since the position detection control means can share the measured temperature from the temperature detection means of the charge control means, it is not necessary to arrange a plurality of temperature detection means, without redundant circuit, without increasing the circuit scale, An electronic timepiece with a position detection function to which a charge control function is added can be provided.

  The predetermined value is the same as a threshold value used for control of the charging control means.

  As a result, the predetermined value for changing the control for the position detection device and the threshold value used for the charge control means are the same, so the temperature detection means and the temperature comparison means can be shared, and a charge control function without redundancy in the circuit configuration is added. An electronic timepiece with a position detection function can be provided.

  As described above, according to the present invention, the control for the position detecting device is changed based on the measured temperature, and the driving time of the driving means is lengthened at a low temperature, so that accurate pointer position detection is possible even at a low temperature. An electronic timepiece with a position detection function with an extended operating temperature range and excellent reliability can be provided.

It is a block diagram which shows the structure of the electronic timepiece with a position detection function concerning the 1st Embodiment of this invention. It is a circuit diagram which shows the structure of the position detection apparatus of the electronic timepiece with a position detection function concerning the 1st Embodiment of this invention. It is sectional drawing of the train wheel centering on the position detection means of the electronic timepiece with a position detection function concerning the 1st Embodiment of this invention. It is a flowchart explaining the position detection operation | movement of the electronic timepiece with a position detection function concerning the 1st Embodiment of this invention. It is a timing chart explaining the position detection operation at the time of normal temperature and low temperature of the electronic timepiece with a position detection function according to the first embodiment of the present invention. It is a block diagram which shows the structure of the electronic timepiece with a position detection function concerning the 2nd Embodiment of this invention. It is a block diagram which shows the structure of the electronic timepiece with a position detection function concerning the 3rd Embodiment of this invention. It is explanatory drawing explaining the position detection operation | movement and charge control operation | movement of an electronic timepiece with a position detection function concerning the 3rd Embodiment of this invention. It is a block diagram which shows the structure of the electronic timepiece with a position detection function concerning the 4th Embodiment of this invention. It is a block diagram which shows the structure of the electronic timepiece with a position detection function concerning the modification of the 4th Embodiment of this invention. It is a circuit diagram which shows the structure of the conventional position detection apparatus. It is explanatory drawing which compares the operation | movement at the time of the low temperature of the conventional position detection apparatus with the operation | movement at the time of the low temperature of the position detection apparatus of this invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[Features of each embodiment]
A feature of the first embodiment is a basic configuration of the present invention, which has an optical position detection device, and has a control means for changing the control for the position detection device based on the measured temperature detected by the temperature detection means. It is the composition which has.

  A feature of the second embodiment is that it has a temperature compensation means of a timer circuit, and this temperature compensation means uses the measured temperature from the temperature detection means.

  A feature of the third embodiment is that it has a charge control means for the secondary battery, and this charge control means uses the measured temperature from the temperature detection means.

  A feature of the fourth embodiment is that it has a charge control means for a secondary battery incorporating a temperature detection means, and the position detection control means uses measured temperature or temperature comparison information from this charge control means.

In addition, in description, the description and figure are one Embodiment, Comprising: It is not limited to this. In addition, dimensions and shapes such as cross-sectional views do not accurately reflect actual shapes, but are partly exaggerated and schematically described so that the drawings can be easily seen and understood. Also, some elements not directly related to the invention are omitted, and the same numbers are assigned to the same elements in each embodiment, and duplicate descriptions are omitted.

[First Embodiment]
[Description of Configuration of Electronic Timepiece with Position Detection Function of First Embodiment: FIG. 1]
The configuration of the electronic timepiece with a position detection function according to the first embodiment will be described with reference to FIG. In FIG. 1, reference numeral 1 denotes an electronic timepiece with a position detection function according to the first embodiment. The electronic timepiece 1 with a position detection function includes a timing circuit 10 having an oscillation circuit 10a and a frequency division / control circuit 10b, a motor 11, a train wheel 20, and a display unit 12 provided with a pointer. Furthermore, a position detection device 30 for detecting the position of the pointer, a temperature detection means 31, a constant voltage output means 32, and a position detection control means 60 incorporating a temperature comparison means 61 are provided.

  The oscillation circuit 10a of the timer circuit 10 is a crystal oscillation circuit using a crystal resonator (not shown), and outputs a reference signal P1. The frequency dividing / control circuit 10b includes a frequency dividing circuit, a counter, a control circuit, a motor drive circuit, and the like. The reference signal P1 is input to count time information, and the timing signal T1, the motor drive signal P2, etc. Output.

  As an example, the timing signal T1 is output when an internal second counter (not shown) is 0 seconds, and is a signal for controlling a position detection control means 60 described later. In addition, the timing circuit 10 inputs a pointer position detection signal VO described later, and performs a pointer position determination and a position detection correction operation.

  The motor 11 is a small and low power step motor, and is driven by a motor drive signal P2. The train wheel 20 is composed of a plurality of gears (not shown), and is rotated by the rotational force from the motor 11 to move the second hand, the minute hand, the hour hand, etc. of the display unit 12 to display the time.

  The position detection device 30 is an optical position detection device that detects the position of the pointer with light, and includes a position detection means 40 and a drive means 50. The position detection means 40 includes a light emitting means 41 that outputs detection light Lt by an LED or the like, and a light receiving means 42 such as a phototransistor.

  The light emitting means 41 and the light receiving means 42 of the position detecting means 40 are arranged so as to sandwich a specific gear of the train wheel 20, and the detection light Lt from the light emitting means 41 is received by passing through a detection hole provided in the gear. The means 42 detects and detects the position of the gear, that is, the position of the pointer. A bidirectional arrow A connecting the train wheel 20 and the position detection means 40 in FIG. 1 indicates that the train wheel 20 and the position detection means 40 are related to each other and detect the pointer position. The detailed configurations of the train wheel 20 and the position detection means 40 will be described later.

  The driving means 50 of the position detection device 30 receives a reference voltage VRF having a predetermined value from the constant voltage output means 32, is driven based on the reference voltage VRF, and is controlled by an enable signal ENB from the position detection control means 60. Thus, the light emitting means 41 and the light receiving means 42 are driven. Further, the driving unit 50 outputs the result of detection of the presence or absence of the detection light Lt by the light receiving unit 42 as the pointer position detection signal VO.

  The position detection control means 60 inputs the measurement temperature TM from the temperature detection means 31 at a predetermined cycle based on the timing signal T1 from the time measuring circuit 10, and the internal temperature comparison means 61 causes a predetermined value TH which is a threshold temperature. If the measured temperature TM is lower than the predetermined value TH, the pulse width of the enable signal ENB for controlling the position detection device 30 is changed.

  That is, the position detection control means 60 changes the control with respect to the position detection apparatus 30 based on the measured temperature TM. The enable signal ENB from the position detection control means 60 also controls the operation of the constant voltage output means 32.

  The temperature detecting means 31 may be a CR oscillation type temperature sensor including a resistance temperature detector such as a thermistor, an IC temperature sensor using temperature characteristics of a semiconductor, or the like. Further, the temperature comparison means 61 built in the position detection control means 60 can use an analog comparator or a digital comparator by converting the measured temperature TM into a digital quantity.

[Description of Circuit Configuration of Position Detection Device of First Embodiment: FIG. 2]
Next, an example of a detailed circuit configuration of the position detection device 30 according to the first embodiment will be described with reference to FIG. The basic configuration of the position detection device 30 is similar to the above-described position detection device 100 of Patent Document 1 (see FIG. 11). I will explain.

  In FIG. 2, the position detection device 30 (enclosed by a large dotted line) includes the position detection means 40 and the drive means 50 as described above. The position detecting means 40 (enclosed by a small dotted line) has an LED 41 as a light emitting means and a phototransistor 42 as a light receiving means.

  The drive means 50 (elements other than the position detection means 40 in the position detection device 30) includes a Pch transistor TP1, a resistor R1, an Nch transistor TN1, and a first comparator CP1 in order to drive the LED 41. Further, the driving unit 50 includes a Pch transistor TP2, a resistor R2, and a second comparator CP2 for driving the phototransistor 42 and outputting a detection signal from the phototransistor 42.

  Each gate G of the Pch transistors TP1 and TP2 receives an enable signal ENB from the position detection control means 60 (see FIG. 1), and when the enable signal ENB becomes active (L level), the Pch transistors TP1 and TP2 The LED 41, the photo, and the transistor 42 are configured to be turned on to reduce power consumption.

  The first comparator CP1 operates with the reference voltage VRF from the constant voltage output means 32 as a reference, and has a function of controlling the drive current Id flowing through the LED 41 to a constant current, so that the battery voltage VBT varies. However, the drive current Id does not fluctuate, and the LED 41 is driven stably.

  The second comparator CP2 also operates with the reference voltage VRF as a reference, compares the collector voltage VC of the phototransistor 42 with the reference voltage VRF, and the phototransistor 42 receives the detection light Lt from the LED 41 and collects the collector voltage. When VC falls below the reference voltage VRF, the pointer position detection signal VO is output. This pointer position detection signal VO is a signal indicating whether or not the position detection device 30 has detected the pointer position, and details of this signal will be described later.

  The first comparator CP1 and the second comparator CP2 are configured to provide an enable terminal E and input an enable signal ENB, similarly to the first and second comparators CP1 and CP2 of FIG. 11 shown as the conventional example. Good. In this case, when the enable signal ENB becomes active, the drive current Id flowing through the LED 41 can be cut off by the operation of the first comparator CP1, so that the Pch transistor TP1 is unnecessary as in FIG.

  Similarly to the driving means 50, the constant voltage output means 32 receives the enable signal ENB, operates only when the enable signal ENB becomes active (L level), and outputs the reference voltage VRF. Therefore, power consumption is reduced.

  Therefore, the position detection device 30 and the constant voltage output means 32 for supplying the reference voltage VRF to the position detection device 30 are controlled by the enable signal ENB from the position detection control means 60, and when the enable signal ENB becomes active. Only works. The period during which the enable signal ENB is active is the drive time for the position detection device 30 and the constant voltage output means 32.

[Arrangement and operation of the wheel train and position detecting means of the first embodiment: FIG. 3]
Next, the arrangement and operation of the train wheel 20 and the position detection means 40 of the first embodiment will be described using the cross-sectional view of FIG. In FIG. 3, reference numeral 21 denotes a fourth wheel attached with a second hand (not shown), which is a gear serving as a position detection target. In the fourth wheel 21, a fourth gear 21 a is press-fitted and fixed to a fourth pinion.

  Reference numeral 22 denotes a fifth wheel for driving the fourth wheel 21, and a fifth gear 22 a is press-fitted and fixed to the fifth pinion. Reference numeral 23 denotes a detection second detection wheel for monitoring the position of the fourth wheel 21 and is driven by the fifth wheel 22 in the same manner as the fourth wheel 21. Reference numeral 24 denotes a base plate made of a metal or plastic member. Reference numeral 25 denotes a metal train wheel bridge. The main plate 24 and the train wheel bridge 25 hold the fifth wheel 22 and the second detection wheel 23 rotatably.

  Reference numeral 26 denotes a board on which the LED 41 of the position detecting means 40 is mounted, and is made of a printed board. Reference numeral 27 denotes a substrate on which the phototransistor 42 of the position detecting means 40 is mounted, and is made of a printed circuit board.

  The board | substrate 27 is arrange | positioned at the ground plane 24, and is fixed with the screw which is not shown in figure. Further, the phototransistor 42 is overlapped with the base plate 24 in a cross-section and is disposed in a hole or notch provided in the base plate 24, thereby reducing the thickness of the timepiece.

  Reference numeral 22b is a fifth gear detection hole that is vacant in the fifth gear 22a, and reference numeral 23b is a second detection gear detection hole that is vacant in the second detection gear 23a. The fifth gear detection hole 22b and the second detection gear detection hole 23b are dedicated detection holes for monitoring the position of the fourth wheel 21, and each detection hole overlaps once every 60 seconds when the fifth wheel 22 is driven. Structure. The fifth wheel & pinion 22 is rotated by the rotational force of the motor 11 (see FIG. 1).

  Here, the planar arrangement of the LED 41 and the phototransistor 42 of the position detection means 40 is on an extension line in the thickness direction where the fifth gear detection hole 22b of the fifth gear 22a and the second detection gear detection hole 23b of the second detection gear 23a overlap. Be placed.

  When the fifth gear detection hole 22b and the second detection gear detection hole 23b overlap, the detection light Lt emitted from the LED 41 passes through the detection hole and is received by the phototransistor 42. The 60-second interval where the two detection holes overlap is the time required for one rotation of the second wheel & pinion 21 to which the second hand (not shown) is attached. When the two detection holes overlap, the second hand is moved to the dial (see FIG. It may be arranged to indicate the 0 second position (not shown).

Therefore, when the second counter (not shown) of the time counting circuit 10 described above is 0 second, the enable signal ENB is output, the timing at which the position detecting means 40 is driven, and the timing at which the two detection holes overlap (the second hand is a character). (Timing for indicating the 0-second position of the board) is matched, so that it is possible to detect whether the time information counted by the time measuring circuit 10 matches the time display by the hands.

  That is, if the two detection holes overlap at the timing at which the position detection means 40 is driven, the phototransistor 42 can receive the detection light Lt, so that the above-described pointer position detection signal VO is output. It can be confirmed that the time information counted by and the time display by the hands match.

  However, when the second hand is displaced from its original position due to an impact or the like, there is a difference between the timing at which the position detection means 40 is driven and the timing at which the two detection holes overlap, so that the detection light Lt from the LED 41 is The phototransistor 42 cannot receive the detection light Lt because it is blocked without passing through the two detection holes. As a result, the pointer position detection signal VO is not output, and it can be confirmed that the position of the pointer (second hand) has shifted.

[Description of Position Detection Operation of First Embodiment: FIGS. 4 and 5]
Next, details of the position detection operation of the first embodiment will be described with reference to FIGS. 4 is a flowchart showing the order of position detection operation, FIG. 5A is a timing chart showing the position detection operation at normal temperature, and FIG. 5B is a timing chart showing the position detection operation at low temperature. . The configuration of the electronic timepiece 1 with a position detection function is shown in FIG. 1, and the circuit configuration of the position detection device 30 is shown in FIG.

  In FIG. 4, the position detection control means 60 of the electronic timepiece 1 with a position detection function inputs the timing signal T1 from the timer circuit 10 and determines whether or not it is the temperature detection timing (FIG. 4: step S1). If the timing signal T1 does not come, the process waits (determination N). If the timing signal T1 arrives (determination Y), the process proceeds to the next step S2.

  Next, in step S1, if the determination is Y (timing signal T1 has arrived), the position detection control means 60 activates the temperature detection means 31 to acquire the measured temperature TM (FIG. 4: step S2. FIG. 5: (See timing t1). Here, as described above, the timing signal T1 is output when the time information (second counter) of the time measuring circuit 10 is 0 seconds, and the timing t1 and the timing t1 at which the temperature detecting means 31 is activated are synchronized ( (See FIG. 5). Therefore, if there is no deviation in the position of the pointer, the temperature detecting means 31 is activated every time the second hand is at the 0 second position of the dial, and the measured temperature TM is acquired.

  Next, the position detection control means 60 compares the acquired measured temperature TM with a predetermined value TH stored beforehand (for example, 0 ° C .: threshold temperature for changing control) by the internal temperature comparison means 61. Then, it is determined whether or not the measured temperature TM is lower than the predetermined value TH (FIG. 4: step S3). If the measured temperature TM is not lower than the predetermined value TH (determination N: normal temperature), the process proceeds to step S4. If the measured temperature TM is lower than the predetermined value TH (determination Y: low temperature), the process proceeds to step S5. The predetermined value TH (threshold temperature) can be arbitrarily changed according to the performance and specifications of the electronic timepiece.

  Next, when it is determined N in step S3, the position detection control means 60 sets the pulse width of the output enable signal to a normal temperature value (for example, 1.5 mS) (FIG. 4: step S4). If the determination is YES in step S3, the position detection control means 60 sets the pulse width of the output enable signal ENB to a low temperature value (for example, 2.5 mS) (FIG. 4: step S5).

  Next, the timer circuit 10 outputs a motor drive signal P2 to drive the motor 11, drives the motor 11 one step, and sets the second hand 12a (see FIG. 1) to the 0 second position of the dial, for example. (FIG. 4: Step S6; see FIG. 5: timing t2).

Next, the position detection control means 60 outputs the enable signal ENB after a predetermined time when the motor drive signal P2 is output, and activates the position detection device 30 and the constant voltage output means 32 (FIG. 4: step S7). . If step S3 is determination N (normal temperature), an enable signal ENB having a pulse width set to 1.5 mS is output (see FIG. 5A: timing t3).
On the other hand, if the determination in step S3 is Y (low temperature), the enable signal ENB having a pulse width set to 2.5 mS is output (see FIG. 5B: timing t3).

  Next, the position detection device 30 and the constant voltage output means 32 are activated by inputting the enable signal ENB, and the detection light Lt is emitted from the LED 41 which is a light emitting means. The detection light Lt passes through the fifth gear detection hole 22b and the second detection gear detection hole 23b (see FIG. 3) of the train wheel 20 described above, reaches the phototransistor 42 as the light receiving means, and is supplied to the second of the driving means 50. The pointer position detection signal VO is output from the comparator CP2 (see FIG. 2) (FIG. 4: step S8).

  Here, as shown in FIG. 5A, when the measurement temperature TM is normal temperature (for example, 20 ° C.), as described above, the pulse width of the enable signal ENB is 1.5 mS. 30 and the constant voltage output means 32 are activated quickly, so that the pointer position detection signal VO is output as a normal pulse signal substantially equal to the pulse width of the enable signal ENB. Further, since the pulse width of the enable signal ENB is short at normal temperature, the driving time of the position detection device 30 and the constant voltage output means 32 is shortened, and the pointer position detection operation can be realized with low power consumption.

  As shown in FIG. 5B, when the measurement temperature TM is a low temperature (for example, −10 ° C.), the pulse width of the enable signal ENB becomes long as described above, for example, 2.5 mS. Here, due to the low temperature, the activation of the position detection device 30 and the constant voltage output means 32 is delayed, and the fall of the position detection signal VO is delayed from the timing t3 of the enable signal ENB, resulting in a delay time t4.

  However, since the pulse width of the enable signal ENB is set to be long at low temperatures, the pointer position detection signal VO is a pulse signal substantially equal to the pulse width at room temperature even when the delay time t4 occurs in the pointer position detection signal VO. Therefore, no malfunction occurs in the pointer detection.

  In step S8, the pointer (second hand) is displaced due to an impact or the like, and the detection light Lt from the LED 41 does not reach the phototransistor 42 at the timing t3 of the enable signal ENB. However, the pointer position detection signal VO is not output, and it can be determined that the pointer position has shifted. Since the determination of the position detection result after step S8 and the pointer position correcting operation when the position deviation of the pointer is detected are known techniques, the description thereof will be omitted.

  Further, the cycle in which the temperature detecting means 31 is activated and the measured temperature TM is output (that is, FIG. 5: the repetition cycle of the timing t1) is the same as the cycle in which the second hand 12a becomes the 0 second position of the dial as described above. Yes, with a period of 60 seconds. The cycle in which the temperature detection unit 31 is activated for outputting the pointer and outputs the measured temperature TM is referred to as the temperature detection cycle of the temperature detection unit 31.

If the determination at step S3 is Y (low temperature determination), it is determined that the position detection operation at low temperature becomes unstable, and the position detection control means 60 stops the output of the enable signal ENB, and the driving means 50 The position detection device 30 including the drive may be stopped. As a result, the unstable operation of detecting the pointer position at low temperatures can be eliminated. This position detection stop operation is effective when the environmental temperature is a considerably low temperature (for example, −10 ° C. or lower). During the position detection stop period due to the low temperature, the detection target pointer (second hand) may be stopped at the reference position (for example, 0 second position).

  Further, although not described in the flowchart of FIG. 4, the determination of the measurement temperature TM in step S3 is performed in two stages. For example, at a low temperature of 0 ° C. or lower, the pulse width of the enable signal ENB is lengthened, and further low At 10 ° C. or lower), the enable signal ENB may be stopped to stop the position detection operation. As a result, it is possible to reliably detect the pointer position at a low temperature and to prevent a malfunction at a further low temperature.

[Description of Operation at Low Temperature of Position Detection Device of First Embodiment: FIG. 12B]
Next, details of the operation of the position detection device 30 at a low temperature (for example, −10 ° C.) will be described with reference to FIG. The configuration of the position detection device 30 is referred to FIG. In FIG. 12B, when an enable signal ENB having a pulse width of 2.5 mS is output as an operation at a low temperature (that is, the driving time is 2.5 mS), depending on the temperature characteristics of the driving unit 50 and the constant voltage output unit 32. The drive voltage VAK applied to the LED 41 has a gradual and slow fall due to the low temperature. As a result, the rise of the detection light LT from the LED 41 is also delayed.

  The phototransistor 42 receives the detection light LT, but because of the low temperature, the falling of the pointer position detection signal VO that is the output of the second comparator CP2 (see FIG. 2) is further delayed, resulting in a delay time. After t4 elapses, the pointer position detection signal VO is output.

  However, as described above, in this embodiment, since the pulse width of the enable signal ENB is set to be long at a low temperature, even if the delay time t4 exists due to the low temperature, as shown in the drawing, the pointer position detection signal VO is output as a normal pulse signal, and the position of the pointer can be reliably detected at a low temperature. Thus, the effect of the present invention becomes clear when compared with the conventional operation at a low temperature (see FIG. 12A).

  Further, it is preferable to determine how long the driving time of the position detection device 30 is to be based on the delay time t4 of the pointer position detection signal VO at low temperatures. For example, if the delay time t4 is about 1 mS at a predetermined low temperature, the drive time is set to a drive time obtained by adding about 1 mS corresponding to the delay time t4 to the drive time at a normal temperature, so that the position detection device at a low temperature is obtained. The operation of 30 can be assured as at normal temperature.

  As described above, according to the electronic timepiece with a position detection function of the first embodiment, the control for the position detection device 30 is changed based on the measured temperature TM, and the driving means 50 of the position detection device 30 is fixed at a low temperature. By extending the driving time of the voltage output means 32, it is possible to accurately detect the position of the pointer even at low temperatures, and the operating temperature range of the timepiece can be expanded to provide an electronic timepiece with a position detection function having excellent reliability. Further, when the measurement temperature TM is normal temperature, the power consumption for detecting the pointer position can be reduced as much as possible by shortening the driving time, so that an electronic timepiece with a position detecting function with low power consumption can be realized.

[Second Embodiment]
[Description of Configuration of Electronic Timepiece with Position Detection Function of Second Embodiment: FIG. 6]
Next, the configuration of the electronic timepiece with a position detection function according to the second embodiment will be described with reference to FIG. The feature of the second embodiment is that it has a rate temperature compensation means, and this temperature compensation means uses the measured temperature from the temperature detection means for detecting the pointer position. In FIG. 6, reference numeral 2 denotes an electronic timepiece with a position detection function according to the second embodiment.

The configuration of the electronic timepiece 2 with a position detection function is the same as that of the electronic timepiece 1 with the position detection function of the first embodiment. The timer circuit 10, the motor 11, the train wheel 20, the display unit 12 provided with a pointer, the position of the pointer Position detecting device 30, temperature detecting means 31, constant voltage output means 32, position detection control means 60, and the like.

  Reference numeral 70 denotes temperature compensation control means that is a feature of the present embodiment. The temperature compensation control means 70 has a function for compensating a temperature characteristic of a crystal resonator (not shown) of the oscillation circuit 10a included in the timing circuit 10 to realize a stable rate with respect to temperature. Yes.

  Therefore, the temperature compensation control means 70 needs temperature information of the environment where the timepiece is placed, but in this embodiment, necessary temperature information is obtained from the temperature detection means 31 for detecting the pointer position. . That is, the temperature compensation control means 70 inputs the measured temperature TM from the temperature detection means 31 at a predetermined period, and calculates temperature compensation data for correcting the temperature characteristics of the crystal resonator based on the acquired temperature information. Then, control signals P3 and P4 are output to the timer circuit 10 based on the updated temperature compensation data.

  The control signal P3 is input to the oscillation circuit 10a of the timer circuit 10, and the load capacitor (not shown) of the oscillation circuit 10a is switched to change the frequency of the reference signal P1 (that is, the oscillation frequency of the oscillation circuit 10a) to the measurement temperature TM. Adjust according to. The adjustment by the control signal P3 is suitable for fine adjustment of the rate.

  Further, the control signal P4 is input to the frequency dividing / control circuit 10b of the time measuring circuit 10, and the frequency dividing ratio of the frequency dividing circuit is changed to change the cycle of the motor drive signal P2 (that is, the rate) according to the measured temperature TM. Adjust. The adjustment by the control signal P4 is suitable for the coarse adjustment of the rate. Further, only one of the control signals P3 and P4 may be used.

  Here, as described above, the temperature compensation control means 70 acquires the measured temperature TM at a predetermined cycle, newly calculates temperature compensation data based on the latest temperature information, and outputs control signals P3 and P4. Then, the timer circuit 10 is controlled, and the period of obtaining the measured temperature TM and updating the temperature compensation data is referred to as a temperature compensation period.

  In the present embodiment, the temperature compensation cycle of the temperature compensation control unit 70 is configured to be the same as the temperature detection cycle of the temperature detection unit 31 for detecting the pointer described above. That is, the temperature compensation cycle of the temperature compensation control means 70 is performed in synchronization with the temperature detection timing t1 of the temperature detection means 31 shown in FIG.

  Note that temperature compensation control for compensating the temperature characteristics of the crystal resonator is a well-known technique, and thus detailed description of the temperature compensation control means 70 is omitted.

  As described above, according to the electronic timepiece with a position detection function of the second embodiment, the temperature compensation control means 70 shares the measurement temperature TM from the temperature detection means 31 for detecting the pointer, and the measurement temperature TM is used as the measurement temperature TM. Since the temperature compensation of the time measuring circuit 10 is performed based on this, it is not necessary to provide a plurality of temperature detection means, and the position detection function-equipped electronic timepiece having a temperature compensation function with a small-scale circuit configuration is provided. it can.

  Further, the temperature detection cycle of the temperature detection means 31 for detecting the pointer and the temperature compensation cycle of the temperature compensation control means 70 are the same, and the two functions are performed at the same timing, so that the configuration of the temperature detection control can be simplified. At the same time, since the drive time of the position detection control and the temperature compensation control is only required once per 60 seconds, for example, further reduction in power consumption of the electronic timepiece can be realized.

In addition, when the pointer position detection function of the present invention is added to the electronic timepiece with temperature compensation function, the temperature detection means is already provided for temperature compensation control. Therefore, the temperature from the temperature detection means for temperature compensation control is provided. Information may be used by the position detection means 60. That is, an electronic timepiece having both a position detection function and a temperature compensation function can share one temperature detection means.

[Third Embodiment]
[Description of Configuration of Electronic Timepiece with Position Detection Function of Third Embodiment: FIG. 7]
Next, the configuration of the electronic timepiece with a position detection function according to the third embodiment will be described with reference to FIG. The feature of the third embodiment is that it has a charge control means for the secondary battery, and this charge control means uses the measured temperature from the temperature detection means for detecting the pointer position. In FIG. 7, reference numeral 3 denotes an electronic timepiece with a position detection function according to the third embodiment.

  The configuration of the electronic timepiece 3 with position detection function is the same as that of the electronic timepiece 1 with position detection function of the first embodiment. The timer circuit 10, the motor 11, the train wheel 20, the display unit 12 provided with a pointer, the position of the pointer. Position detecting device 30, temperature detecting means 31, constant voltage output means 32, position detection control means 60, and the like.

  Reference numeral 80 denotes charge control means that is a feature of the present embodiment. Reference numeral 81 denotes power generation means such as a solar battery, and reference numeral 82 denotes a secondary battery. The charging control means 80 inputs the generated power P5 from the power generating means 81, supplies the secondary battery 82 with the charging power P6, and charges the secondary battery 82. The secondary battery 82 is charged with the supply of the charging power P6, outputs the battery voltage VBT, and drives the electronic timepiece 3 with a position detection function.

  Here, since the secondary battery 82 is prohibited from being charged at low temperatures (for example, 0 ° C. or lower) due to its charging characteristics, the charging control means 80 includes temperature information on the environment where the clock is placed. And the control for prohibiting the charging operation to the secondary battery 82 at low temperature is necessary. Therefore, the charging control means 80 needs temperature information of the environment where the timepiece is placed, but in this embodiment, the required temperature information is obtained from the temperature detection means 31 for detecting the pointer position.

  That is, the charging control unit 80 inputs the measured temperature TM from the temperature detecting unit 31 at a predetermined cycle, and compares the acquired measured temperature TM with a prestored threshold value (for example, 0 ° C.). Compare by means 80a. If the measured temperature TM is higher than the threshold value as a result of the temperature comparison, the charging control means 80 supplies the charging power P6 to the secondary battery 82 and performs the charging operation. As a result of the temperature comparison, if the measured temperature TM is lower than the threshold value, it is determined that the charging is prohibited and the charging power P6 is cut off and charging is prohibited.

  The temperature detection cycle of the temperature detection unit 31 for detecting the pointer and the charge control cycle in which the charge control unit 80 acquires and controls the measured temperature TM are the same as in the second embodiment. Good. Thereby, the configuration of the temperature detection control can be simplified, and further reduction in power consumption of the electronic timepiece can be realized.

  Further, when the position detection control means 60 for controlling the pointer detection changes the predetermined value TH for changing the control with respect to the position detection device 30 and the threshold value for prohibiting the charging of the secondary battery 82 by the charge control means 80 (for example, The charge control means 80 receives a temperature comparison result signal P7 (shown by a dotted line in FIG. 7) from the temperature comparison means 61 of the position detection control means 60, and the temperature comparison result signal P7 The charging power P6 may be cut off to prohibit charging.

  For example, when the temperature comparison result signal P7 is logic “1”, the measurement temperature TM is normal temperature, and when the temperature comparison result signal P7 is logic “0”, the measurement temperature TM is low (threshold temperature or less). In this case, since the temperature comparison means 80a inside the charge control means 80 is not required, the circuit configuration of the charge control means 80 can be simplified.

[Description of Temperature-Based Position Detection Operation and Charging Control Operation: FIG. 8]
Next, a position detection operation and a charge control operation based on the temperature of the electronic timepiece 3 with a position detection function according to the third embodiment will be described with reference to FIG. In FIG. 8, the horizontal axis represents the measured temperature TM, and shows the operation with respect to the temperature of the enable signal ENB and the charging power P6. Further, as a condition, the predetermined value TH at which the position detection control means 60 changes the control with respect to the position detection device 30 and the threshold value at which the charge control means 80 prohibits the charging of the secondary battery 82 are equal and both are 0 ° C. A case will be described as an example.

  In FIG. 8, when the measured temperature TM measured by the temperature detecting means 31 exceeds 0 ° C., the position detection control means 60 determines that the measured temperature TM exceeds a predetermined value TH (normal temperature), and enables the enable signal. The pulse width of ENB is shortened (for example, 1.5 mS) and output.

  Further, the position detection control means 60 outputs the above-described temperature comparison result signal P7 as logic “1”. At the same time, the charging control means 80 inputs this temperature comparison result signal P7, determines that charging is possible from its logic, turns on the charging power P6, and performs the charging operation of the secondary battery 82. When the measured temperature TM measured by the temperature detecting means 31 is lower than 0 ° C. due to the decrease in the environmental temperature, the position detection control means 60 determines that the measured temperature TM is lower than the predetermined value TH (low temperature), The pulse width of the enable signal ENB is increased (for example, 2.5 mS) and output.

  Further, the position detection control means 60 outputs the above-described temperature comparison result signal P7 as logic “0”. At the same time, the charging control means 80 receives the temperature comparison result signal P7, determines that charging is prohibited from the logic, turns off the charging power P6, and inhibits charging of the secondary battery 82.

  As described above, according to the electronic timepiece with a position detection function of the third embodiment, the charging control means 80 shares the measured temperature TM from the temperature detecting means 31 for detecting the pointer, and based on the measured temperature TM. Since the secondary battery charging control is performed, there is no need to provide a plurality of temperature detecting means, circuit redundancy can be prevented, and a position detection function-equipped electronic timepiece having a charging control function with a small circuit configuration can be provided.

  Note that the measured temperature TM of the temperature detecting means 31 for position detection is not limited to the temperature compensation function of the timing circuit shown in the second embodiment and the charge control function shown in the third embodiment. It can also be used arbitrarily for controlling the functions. Moreover, the structure which has both the temperature compensation function of 2nd Embodiment and the charge control function of 3rd Embodiment, and shares the measurement temperature TM of the temperature detection means 31 may be sufficient.

[Fourth Embodiment]
[Description of Configuration of Electronic Timepiece with Position Detection Function of Fourth Embodiment: FIG. 9]
Next, the configuration of the electronic timepiece with a position detection function according to the fourth embodiment will be described with reference to FIG. The feature of the fourth embodiment is that it has a charge control means for a secondary battery incorporating a temperature detection means, and the pointer detection control means uses the measured temperature from this charge control means. In FIG. 9, reference numeral 4 denotes an electronic timepiece with a position detection function according to the fourth embodiment.

  The configuration of the electronic timepiece 4 with position detection function is the same as that of the electronic timepiece 1 with position detection function of the first embodiment. The timer circuit 10, the motor 11, the train wheel 20, the display unit 12 provided with a pointer, the position of the pointer. Position detecting device 30, constant voltage output means 32, position detection control means 60, and the like.

Reference numeral 90 denotes a charge control means that is a feature of the present embodiment. Moreover, the structure of the power generation means 81 and the secondary battery 82 by a solar cell etc. is the same as that of 3rd Embodiment. The charging control means 90 includes a temperature detection means 90a for detecting the temperature around the electronic timepiece 4 with a position detection function and a temperature comparison means 90b for comparing the measured temperatures.

  The charging control means 90 inputs the generated power P5 from the power generating means 81, supplies the secondary battery 82 with the charging power P6, and charges the secondary battery 82. The secondary battery 82 is charged by receiving the supply of the charging power P6, outputs the battery voltage VBT, and drives the electronic timepiece 4 with position detection function.

  Here, since the secondary battery 82 is prohibited from charging at low temperatures (for example, 0 ° C. or less) due to its charging characteristics, the charging control means 90 has temperature information on the environment where the clock is placed. Although necessary, the charge control means 90 of this embodiment incorporates a temperature detection means 90a for detecting necessary temperature information.

  That is, the charging control means 90 acquires the measured temperature TM at a predetermined cycle from the built-in temperature detection means 90a. Then, the charging control means 90 compares the acquired measured temperature TM with the threshold value stored in advance by the internal temperature comparison means 90b, and controls the charging operation or charging prohibition of the secondary battery 82 according to the temperature. To do.

  Further, the position detection control means 60 for detecting the pointer inputs the measured temperature TM from the charge control means 90 at the above-described 60-second cycle, compares it with the predetermined value TH stored by the internal temperature comparison means 61, If the measured temperature TM is lower than the predetermined value TH, the pulse width of the enable signal ENB for controlling the position detection device 30 and the constant voltage output means 32 is changed.

  Thus, the temperature detection means 90a built in the charge control means 90 uses the measured temperature TM, which is the output, as temperature information of the position detection control means 60 that detects the pointer. Then, a charging control cycle for acquiring the measurement temperature TM from the temperature detection means 90a built in the charge control means 90, and a temperature at which the position detection control means 60 acquires the measurement temperature TM from the charge control means 90 for detecting the pointer. It is preferable that the detection cycle is the same and the timing is the same.

  As described above, according to the electronic timepiece with a position detection function of the fourth embodiment, the charge control means 90 for controlling the charging of the secondary battery incorporates the temperature detection means 90a, and the position detection control is performed on the measured temperature TM. Since the means 60 is shared, it is not necessary to arrange a plurality of temperature detection means, and it is possible to provide an electronic timepiece with a position detection function that prevents circuit redundancy and adds a charge control function with a small circuit configuration.

  Further, since the charge control IC incorporating the temperature detection means and the temperature comparison means is commercialized and commercially available, the use of this general-purpose charge control IC facilitates designing and is advantageous in terms of cost with an electronic timepiece having a position detection function. Can be realized. In addition, if the above-described charging control cycle and the temperature detection cycle for position detection are the same, the two functions of charging control and position detection control can be performed at the same timing. For example, only once every 60 seconds, further reduction of power consumption of the electronic timepiece can be realized.

[Description of Configuration of Electronic Timepiece with Position Detection Function of Modified Example of Fourth Embodiment: FIG. 10]
Next, the configuration of an electronic timepiece with a position detection function according to a modification of the fourth embodiment will be described with reference to FIG. A feature of the modification of the fourth embodiment is that it has a charge control means for a secondary battery incorporating a temperature detection means, and a threshold value used for control of the charge control means and control for detecting a pointer. The predetermined value TH with which the means changes the control is equal. In FIG. 10, reference numeral 5 denotes an electronic timepiece with a position detection function according to a modification of the fourth embodiment.

The configuration of the electronic timepiece 5 with position detection function is the same as that of the electronic timepiece 1 with position detection function of the first embodiment. The timer circuit 10, the motor 11, the train wheel 20, the display unit 12 provided with the pointer, the position of the pointer. A position detection device 30, a constant voltage output means 32, a position detection control means 62, and the like. Here, unlike the other embodiments, the position detection control means 62 has a feature that the temperature comparison means is not incorporated.

  Moreover, the structure of the charge control means 90 which incorporates the power generation means 81 and the secondary battery 82 by solar cells etc., and the temperature detection means 90a and the temperature comparison means 90b is the same as that of 4th Embodiment. The operation of the charging control unit 90 prohibiting the charging operation to the secondary battery 82 at the low temperature based on the temperature information from the built-in temperature detecting unit 90a is also the same.

  Further, the charge control means 90 outputs a temperature comparison result signal P 7 ′ that is an output of the built-in temperature comparison means 90 b and is input to the position detection control means 62. The temperature comparison result signal P7 ′ has the same function as the temperature comparison result signal P7 shown in the third embodiment described above. For example, when the temperature comparison result signal P7 ′ is logic “1”, The measured temperature TM detected by the temperature detecting means 90a is a normal temperature, and when the logic is “0”, the measured temperature TM is a low temperature.

  The charging control means 90 performs charging control of the secondary battery 82 based on the logic of the temperature comparison result signal P7 ′. The position detection control means 62 also receives the temperature comparison result signal P7 ′, and changes the control of the position detection device 30 and the constant voltage output means 32 based on the logic.

  That is, if the temperature comparison result signal P7 ′ is logic “1”, it is determined that the temperature is normal, and the pulse width of the enable signal ENB is shortened (for example, 1.5 mS). If the temperature comparison result signal P7 ′ is logic “0”, it is determined that the temperature is low, and the pulse width of the enable signal ENB is increased (for example, 2.5 mS).

  Therefore, in the present embodiment, the threshold value used by the charge control means 90 for starting and prohibiting the charge control of the secondary battery 82 is the same as the predetermined value TH for changing the position detection control by the position detection control means 62.

  As described above, according to the position detection function-equipped electronic timepiece of the fourth embodiment, the charge control means 90 for controlling the charging of the secondary battery includes the temperature detection means 90a and the temperature comparison means 90b, Since the position detection control means 62 is operated by the temperature comparison result signal P7 ′ from the temperature comparison means 90b, the temperature detection means and the temperature comparison means for detecting the pointer position are unnecessary.

  As a result, it is possible to provide an electronic timepiece with a position detection function to which a charge control function is added, in which circuit redundancy is prevented and the configuration of the position detection control means 62 is simplified. In addition, by using a general-purpose charging control IC incorporating a temperature detection means and a temperature comparison means, an electronic timepiece with a position detection function that is easy to design and advantageous in terms of cost can be realized.

  Note that the block diagrams, circuit diagrams, and the like shown in the embodiments of the present invention are not limited thereto, and can be arbitrarily changed as long as they satisfy the gist of the present invention.

1, 2, 3, 4, 5 Electronic timepiece with position detection function 10 Timing circuit 10a Oscillation circuit 10b Frequency division / control circuit 11 Motor 12 Display unit 20 Train wheel 30 Position detection device 31, 90a Temperature detection means 32 Constant voltage output means 40 Position detecting means 41 Light emitting means (LED)
42 Light receiving means (phototransistor)
50 drive means 60, 62 position detection control means 61, 80a, 90b temperature comparison means 70 temperature compensation control means 80, 90 charge control means 81 power generation means 82 secondary battery

Claims (9)

A position detection device for detecting the position of a display member such as a pointer;
Temperature detecting means for detecting the temperature;
Based on the measured temperature detected by the temperature detecting means,
Control means for changing control over the position detection device ,
Whether the control means compares the measured temperature with a predetermined value set in advance, and if the measured temperature is determined to be lower than the predetermined value, whether the driving time of the position detection device is longer than that at normal temperature. Or an electronic timepiece with a position detection function, wherein driving of the position detection device is stopped . The position detection device includes:
A position detecting means comprising: a light emitting means; and a light receiving means for detecting light from the light emitting means;
The electronic timepiece with a position detection function according to claim 1 , wherein the electronic timepiece has a drive means for driving the position detection means. A constant voltage output means that operates only during the driving time and outputs a constant voltage;
It said drive means, the position detecting function electronic timepiece according to claim 1 or claim 2 characterized in that it is driven by the constant voltage. The position detection function according to any one of claims 1 to 3 , wherein the temperature detection result of the temperature detection means is also used for control of a function that requires temperature information other than the position detection function. Electronic clock with. The electronic timepiece with a position detection function according to claim 4 , wherein the temperature detection result of the temperature detection means is used for temperature compensation of a timer circuit. 6. The electronic timepiece with a position detection function according to claim 5 , wherein a temperature detection cycle of the temperature detection unit and a temperature compensation cycle of the time measuring circuit are the same. A secondary battery as a power source, and charging control means for controlling charging of the secondary battery,
The electronic timepiece with a position detection function according to claim 4 , wherein the measured temperature is also used for charge control of the charge control means. The electronic timepiece with a position detection function according to claim 7 , wherein the charge control means includes the temperature detection means. The position detection function-equipped electronic timepiece according to claim 8 , wherein the predetermined value is the same as a threshold value used for control of the charge control means.

Images