JP2013057517A - Electronic timepiece - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electronic timepiece which does not completely lose analog information represented by a pointer to the possible last minute even when battery voltage drops.SOLUTION: An electronic timepiece comprises: physical quantity measurement means which measures physical quantity; an information pointer 5 which is rotary driven by a motor to indicate a measured value of physical quantity; a scale mark part 8 which displays scale marks for indicating the measured value with the information pointer; display parts 16 and 18 which specify the upper and lower range of the measurement value of physical quantity at the scale mark part; a battery which supplies electric power to the motor; voltage detection means which detects a voltage of the battery; display change control means which expands the range for numeral display at the display parts so as to reduce the rotary driven range of the information pointer when the voltage detection value detected by the voltage detection means drops, and pointer position control means which controls the pointer position of the information pointer.

Description

  The present invention relates to an electronic timepiece including an analog display unit and a digital display unit.

  In an electronic timepiece having a pointer as an analog display and a display unit such as a liquid crystal as a digital display, the power consumption of the motor for moving the hands is much larger than the power consumption in the display of the digital display unit. In view of this, a technique has been considered in which power consumption is reduced by limiting the movement of the hands when the remaining amount of the watch battery (battery) decreases. Patent Document 1 discloses a technique in which first the second hand is stopped according to the battery level (battery voltage), and then the second hand and the hour / minute hand are stopped and only the display on the digital display unit is displayed. Yes.

JP 2005-83979 A

  However, in such a method of sequentially stopping the pointer, the function of the pointer is stopped, and there is a problem that information as an analog display is completely lost.

  The object of the present invention has been made in view of such conventional problems, and even when the battery level (battery voltage) is lowered, the electronic information that does not completely lose the analog information by the pointer as far as possible is obtained. To provide a watch.

In order to achieve the above object, the present invention
A physical quantity measuring means for measuring the physical quantity;
An information guide that is rotated by a motor and points to a physical quantity measurement value;
A scale portion on which a scale for indicating the measured value measured by the physical quantity measuring means by the information guide is displayed;
By the information guideline, a display unit for designating the vertical range of the physical quantity measurement value that can be indicated by indicating the scale of the scale unit by numerical display;
A battery for supplying power to the motor;
Voltage detecting means for detecting the voltage of the battery;
The display unit indicated by the information pointer so as to suppress a rotation driving range of the information pointer rotated according to a change in the measurement value by the physical quantity measuring unit when a voltage detection value by the voltage detecting unit is reduced. Display change control means for increasing the numerical display range of
Pointer position control means for pointing the measured value of the physical quantity with the scale according to the range of the numerical value displayed on the display unit by the information pointer;
It is an electronic timepiece characterized by comprising.

  According to the present invention, it is possible to provide an electronic timepiece in which the movement of the pointer is not lost as much as possible even when the battery level decreases.

1 is a front view of an electronic timepiece 1 according to an embodiment of the present invention. 1 is a block diagram showing an overall configuration of an electronic timepiece 1. FIG. It is the figure which showed the dial 7 part of the electronic timepiece 1 in the state which abbreviate | omitted the minute hand 3 and the hour hand 4. FIG. It is a figure which shows the other example which showed the dial 7 part of the electronic timepiece 1 in the state which abbreviate | omitted the minute hand 3 and the hour hand 4. FIG. It is a figure for demonstrating the temperature display by the small hand 5 which concerns on embodiment of this invention. It is a figure for demonstrating the temperature display by the small hand 5 in the state which the battery level fell most based on embodiment of this invention. It is a flowchart which shows the control procedure of the "range switching process" of embodiment of this invention.

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

  FIG. 1 is a front view of an electronic timepiece 1 according to an embodiment of the present invention. FIG. 2 is a block diagram showing the overall configuration of the electronic timepiece 1.

  As shown in FIG. 1, the electronic timepiece 1 has three hands (minute hand 3, hour hand 4, small hand 5) that rotate on a dial 7 held by a timepiece case 6 so that time and other information can be obtained. Display. The minute hand 3 and the hour hand 4 rotate about the center of the dial plate 7 as a whole, and a small hand (information pointer) 5 for indicating the temperature is provided on the scale portion 8 provided at the 9 o'clock position of the dial plate 7. Rotate in the area. A first LCD (liquid crystal display unit) 16 and a second LCD 18 for time display are provided at two locations above and below the dial. In addition, operation buttons B1 to B4 are provided on the side surface of the watch case 6.

  Further, as shown in FIG. 2, the electronic timepiece 1 includes a first motor 12 and a first gear train mechanism 10 for moving the minute hand 3 and the hour hand 4, a second motor 13 for moving the small hand 5, and a second The two-wheel train mechanism 11, the drive circuit 14 for step-driving the first motor 12, the drive circuit 15 for step-driving the second motor 13, and the dial 7 of the electronic timepiece 1 are provided at two locations and display time and The first LCD (liquid crystal display unit) 16 for performing the function display, the second LCD 18 and drivers 17 and 19 for driving them, the solar cell 21 for generating power by external light, and the generated current of the solar cell 21 A power source 22 that has a secondary battery 21a that inputs and stores electricity, supplies power to each unit, a voltage detection unit (voltage detection means) 23 that detects the output level of the secondary battery 22a, and a temperature sensor that detects the outside air temperature. A sensor (physical quantity measuring means) 24, a temperature sensor control section (physical quantity measuring means) 25 for controlling the energization and measurement cycle of the temperature sensor 24, and an oscillation circuit for generating a signal having a constant cycle for timing. 33, a frequency dividing circuit 34, a time measuring circuit 35 for measuring time, an operation unit 40 having a plurality of operation buttons (B1 to B4) for inputting an external command, and a CPU (central processing unit) for controlling the entire timepiece ) 30, a RAM 31 (Random Access Memory) that provides a working memory space to the CPU 30, a ROM (Read Only Memory) 32 that stores a control program and control data executed by the CPU 30, and an alarm sound. Buzzer circuit 41, speaker 42, and the like.

  The ROM 32 measures time and hands as time passes, displays the time on the hands 3 and 4 and the LCDs 16 and 18, and sets an alarm based on an operation command input via the operation unit 40. The main control processing program, the “range switching processing” program for temperature display, and the “temperature display maximum value / minimum value combination table” are stored.

  The first and second motors 12 and 13 are stepping motors that can be driven forward and backward, respectively. By outputting drive pulses to the first and second motors 12 and 13 by the drive circuit, the rotor of the stepping motor rotates by a predetermined angle (for example, 180 °). By changing the waveform of the drive pulse, the rotor is driven to the forward rotation side or driven to the reverse rotation side. The first and second gear train mechanisms 10 and 11 constitute a transmission mechanism, and a plurality of gears that transmit the rotational movements of the rotors of the corresponding first and second motors 12 and 13 to the corresponding hands. Concatenated and configured.

  The secondary battery 22a stores or discharges the electric power generated by the solar cell 21 using an electrochemical reaction.

  The temperature sensor control unit 25 supplies power to the temperature sensor 24 immediately before measuring the temperature with the temperature sensor 24, measures the temperature with the temperature sensor 24, and stops the power supply after the measurement is completed. In the case of the predetermined mode, the temperature is measured at regular intervals while the temperature sensor 24 is continuously energized.

  The voltage detection unit 23 measures the output voltage (battery level) of the secondary battery 22a according to a command from the CPU 30, converts the measured value into a digital value, and sends it to the CPU 30.

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

  First, the time is displayed by the hour hand 4 and the minute hand 3, as well as the second display on the first LCD 16 as shown in FIG. 1 and the hour / minute and am / pm distinction on the second LCD 18. The operations of the first LCD 16 and the second LCD will be described in detail below.

  Next, the temperature display operation by the small hands 5 in the electronic timepiece 1 will be described with reference to FIGS. FIG. 3 is a view showing the dial 7 portion of the electronic timepiece 1 with the minute hand 3 and the hour hand 4 omitted. FIG. 4 is a view showing another example of the dial 7 portion of the electronic timepiece 1 with the minute hand 3 and the hour hand 4 omitted. FIG. 5 is a view for explaining temperature display by the small needle 5 according to the embodiment of the present invention. FIG. 6 is a diagram for explaining the temperature display by the small hand 5 in the state where the battery level is the lowest according to the embodiment of the present invention.

  As shown in FIGS. 3 and 1, the first LCD 16 is arranged on the upper side of the dial 7, and displays an area for displaying the day of the week / time (second) (upper right side in FIG. 3) and a temperature display in the scale unit 8. The area is divided into areas for displaying the maximum values (upper left in FIG. 3). As shown in FIGS. 3 and 1, the second LCD 18 is disposed below the dial 7 and displays time (hour, minute) and P (among the afternoon if P is displayed) indicating am / pm. The display area is divided into a display area (lower right side in FIG. 3) and a display area (lower left side in FIG. 3) displaying the minimum temperature display value in the scale unit 8. The area for displaying the maximum / minimum value of the temperature display is composed of two areas each of which is a 7-segment drive system, and an area on the left side where minus and 1 can be displayed. Therefore, the maximum temperature display value can be displayed up to plus 199 degrees, and the minimum temperature display value can be displayed up to minus 199 degrees. The scale portion 8 is engraved with 50 equally-divided scale lines in an arc shape.

  3 and 1, the first LCD 16 and the second LCD 18 display the maximum value and the minimum value of the temperature at which the scale in the scale unit 8 can be pointed by the small needle 5, but different configurations may be used. Is possible. FIG. 4 shows another example of the dial 7 portion of the electronic timepiece 1 with the minute hand 3 and the hour hand 4 omitted. In FIG. 4, the first LCD 160 and the second LCD 180 display the maximum value of the temperature at which the scale in the scale unit 80 can be indicated by the small needle 5, the first value and the second value that are not the minimum value.

  Here, when the first LCD 16 and the second LCD 18 are displaying the maximum value and the minimum value of the temperature at which the scale in the scale unit 8 can be indicated by the small needle 5, the range defined by the maximum value and the minimum value is shown. It is expressed as “the upper and lower range of the temperature measurement value”. In FIG. 4, the first LCD 160 and the second LCD 180 display the maximum value of the temperature at which the scale in the scale unit 80 can be indicated by the small needle 5, the first value and the second value that are not the minimum value. The range defined by the first value and the second value in the case is also expressed as “upper and lower range of the temperature measurement value”. That is, the first LCD 16 and the second LCD 18 specify the temperatures corresponding to the maximum scale and the minimum scale of the scale unit 8, or the temperatures corresponding to the two scales that are not the maximum value and the minimum value. In order to include both the designation of the first LCD 160 and the second LCD 180, it is expressed as “designating the upper and lower ranges of the temperature measurement value by numerical display”.

  FIG. 5 shows a case where the temperature of 22.5 degrees is displayed with the small hand 5 of the electronic timepiece 1. In FIG. 5A, the maximum temperature display value is set to 50 degrees and the minimum temperature display value is set to 10 degrees. In this case, one scale is 0.8 degree (resolution 0.8 degree). The small hand 5 indicates 22.5 degrees by pointing the center of the display range slightly below. In FIG. 5B, the maximum temperature display value is set to 30 degrees and the minimum temperature display value is set to 20 degrees. In this case, one scale is 0.2 degrees (resolution 0.2 degrees). The small hand 5 indicates 22.5 degrees by pointing near the lower limit of the display range. In FIG. 5C, the LCD temperature display maximum value is set to 25 degrees, and the temperature display minimum value is set to 20. In this case, one scale is 0.1 degree (resolution 0.1 degree). The small hand 5 displays 22.5 degrees by indicating the center of the display range.

  As described above, in FIGS. 5A, 5B, and 5C, the pointer positions of the small hands 5 are different from each other even though the small hands 5 display 22.5 degrees. That is, the temperature display range can be changed by previously setting a plurality of combinations of the maximum temperature display value and the minimum temperature display value and changing the combination. Moreover, even if the display temperature is the same, the pointer position of the small needle 5 can be varied.

  In FIG. 5, when the angle range (rotation drive range) in which the small needle 5 is driven in the same temperature range is compared, (c)> (b)> (a) in order of increasing rotation drive range. If the condition shown in FIG. 5C is selected when the battery level is sufficiently high, the temperature resolution is high and the temperature change can be well distinguished. On the other hand, the rotational driving of the small needle 5 becomes large, and the power consumption increases. Therefore, when the battery level is low, the specification with high resolution as shown in FIG. 5C places a load on the secondary battery. This is because the power consumption of the motor is approximately one digit larger than the power consumption during temperature measurement and liquid crystal display.

  Therefore, the combination of the temperature display maximum value and the minimum value is changed to, for example, the order of FIGS. 5C, 5B, and 5A (the direction in which the resolution gradually decreases) in accordance with the decrease in the battery level. That is, when the battery level is lowered, the numerical value range of the scale portion by the numerical display on the display portion (first LCD 16 and second LCD 18) is increased in order to suppress the rotational driving of the small hand 5. Conversely, when the secondary battery 22a is charged by the power generation of the solar cell and the battery level of the secondary battery 22a increases, the combination of the temperature display maximum value / minimum value is reduced in the numerical range (the resolution is increased). ) Change direction.

  Next, in a state where the battery level is the lowest and is equal to or lower than a predetermined set voltage, the temperature display as shown in FIGS. 6A to 6C is performed. That is, in FIGS. 6A to 6C, the pointer of the small needle 5 is stopped at a position of the dial 7 at 9 o'clock as an example of “an angular position indicating a predetermined scale of the scale portion”. Further, the difference in the numerical display range of the display unit constituted by the first LCD 16 and the second LCD 18, that is, “the difference between the maximum temperature display value and the minimum temperature display value” is fixed to 10 degrees. One scale is 0.2 degree (resolution 0.2 degree).

  In FIG. 6A, the maximum temperature display value is set to 30 degrees and the minimum temperature display value is set to 20 degrees, thereby causing the small hand 5 to indicate the display temperature of 25 degrees. In FIG. 6B, the maximum temperature display value is set to 28 degrees and the minimum temperature display value is set to 18 degrees, thereby causing the small hand 5 to indicate the display temperature of 23 degrees. Further, in FIG. 6C, the maximum temperature display value is 29 degrees and the minimum temperature display value is 19 degrees, thereby causing the small hand 5 to indicate the display temperature of 24 degrees. That is, the small hand 5 is not rotationally driven, and the temperature display is substantially performed by the small hand 5 by changing the maximum temperature display value and the minimum temperature display value in conjunction with the change of the temperature to be displayed.

  In this way, the pointer of the small needle 5 is not moved, but the difference in the numerical display range on the display unit, that is, the “difference between the maximum temperature display value and the minimum temperature display value” is fixed, and the maximum temperature display value and the minimum temperature display value are fixed. By updating and displaying the value, the function of the small hand 5 can be substantially continued to the last state even when the battery level becomes extremely low.

  Next, the switching control process will be described in detail based on a flowchart.

  FIG. 7 is a flowchart showing the control procedure of the “range switching process” according to the embodiment of the present invention. Assume that four voltage values of high (HIGH), middle (MID) end, middle (MID), and low (LOW) are determined in advance as reference voltage values of the battery. Further, it is assumed that the display resolution is set to 0.1 degrees at the beginning of the “range switching process” and the battery level is higher than high.

  When the “range switching process” is started, the CPU 30 first detects the battery level of the secondary battery 22a by the voltage detector 23 and determines whether or not the battery level is higher than high (step S1). If it is determined that the battery level is higher than high, the process branches to “YES”, and the temperature display resolution is set to 0.1 degree (the difference between the temperature display maximum value and the temperature display minimum value is set to 5 degrees). (Step S2). Since the initial resolution is 0.1 degree, the set value is actually maintained.

  Next, the CPU 30 checks whether or not the current pointer position of the small hand 5 is the pointer position to be updated based on the measured value of the temperature sensor (step S9). Branch and move the small hand 5 to a desired position (step S10). If it is determined in step S9 that updating is not necessary, the process branches to “YES” and the CPU 30 does not move the small hand 5. In other words, the small needle 5 is not driven to rotate.

  Next, the CPU 30 performs LCD display update (step S12). LCD display update refers to updating the temperature display maximum value and the temperature display minimum value. Since the initial resolution is 0.1 degree and the set resolution is 0.1 degree, the display is updated to the same value. That is, it is rewritten to the same value. And it ends.

  If it is determined in step S1 that the battery level is lower than high, the process branches to “NO”, and the CPU 41 determines whether or not the battery level of the secondary battery 22a by the voltage detection unit 23 is higher than the middle level. (Step S3). If it is determined in step S3 that the battery level is higher than the middle level, the process branches to “YES”, and further, it is determined whether or not the battery level is higher than the middle period (step S4). If the battery level is higher than the end of the middle, the process branches to “NO”, and the temperature display resolution is set to 0.2 degrees (step S5). In step S4, if the battery level is lower than the end of the middle, the process branches to “YES”, and the temperature display resolution is set to 0.4 degrees (step S6).

  Next, the CPU 30 checks whether or not the current pointer position of the small hand 5 is the pointer position to be updated based on the measured value of the temperature sensor (step S9). Branch and move the small hand 5 to a desired position (step S10). If it is determined in step S9 that updating is not necessary, the process branches to “YES” and the CPU 30 does not move the small hand 5.

  Next, the CPU 30 performs LCD display update (step S12). Since the initial resolution is 0.1 degrees and the set resolution is 0.2 degrees or 0.4 degrees, the display is updated to correspond to 0.2 degrees or 0.4 degrees. Specifically, the ROM 32 stores a resolution and a “temperature display maximum value / minimum value combination table” in which a combination of the temperature display maximum value / minimum value corresponding to the resolution is stored. Change to a display corresponding to 2 degrees or 0.4 degrees. And it ends.

  If it is determined in step S3 that the battery level is lower than the middle level, the process branches to “NO”, and the CPU 30 detects the battery level of the secondary battery 22a by the voltage detection unit 23, and the battery level is lower than the low level. Is also determined whether it is higher (step S7).

  If it is determined in step S7 that the battery level is higher than low, the process branches to “YES” and the resolution is set to 1 degree (step S8).

  Next, the CPU 30 checks whether or not the current pointer position of the small hand 5 is the pointer position to be updated based on the measured value of the temperature sensor (step S9). Branch and move the small hand 5 to a desired position (step S10). If it is determined in step S9 that updating is not necessary, the process branches to “YES” and the CPU 30 does not move the small hand 5.

  Next, the CPU 30 performs LCD display update (step S12). Since the initial resolution is 0.1 degree and the set resolution is 1 degree, the display is updated to correspond to the resolution of 1 degree. Specifically, the display is changed to one-time display based on the “temperature display maximum value / minimum value combination table” stored in the ROM 32. And it ends. Here, the CPU 30, step S1 to step S8, and step S12 are display change control means. The CPU 30, step S9, and step S10 are pointer position control means.

  Furthermore, when the battery level is lower than low in step S7, the CPU 30 fixes the small hand in the 9 o'clock direction of the dial 7 (step S11). Here, low (LOW) is a “predetermined set voltage”. The temperature display range is set to 10 degrees, for example, and the CPU 30 calculates the maximum temperature display value and the minimum temperature display value based on the temperature measurement value, and updates the LCD display (step S12). And it ends. Here, the CPU 30 and step S11 are pointer stop means. The CPU 30 and step S12 when the battery level is lower than low are also display change control means.

  As described above, by changing the display method using the small hand 5 depending on the battery level, it is possible to perform the analog display using the small hand 5 so that the analog information is not lost completely until the drive voltage limit even when the power is reduced. Become.

  Now, the electronic timepiece 1 has a plurality of temperature measurement modes. The explanation so far has been about the normal measurement mode. The temperature measurement interval in the normal temperature measurement mode is, for example, every 2 minutes. In addition to the normal measurement mode, a dedicated temperature measurement mode is also provided. In the temperature measurement only mode, for example, measurement is performed once every 2 seconds. As described above, in the temperature measurement, the sensor is measured after the power is turned on immediately before the measurement. However, in the temperature measurement dedicated mode, the sensor power supply is always turned on and measured.

  In the dedicated mode, the “range switching process” is not performed. This is because in the temperature measurement only mode, frequent measurement may cause a short-term drop in the battery level and increase the voltage measurement error, and if the range is changed frequently, the user's convenience may be adversely affected. Considering that there is.

  As described above, in the electronic timepiece 1 according to the present embodiment, when the voltage detection value of the battery such as the secondary battery 22a by the voltage detection unit (voltage detection unit) 23 decreases, the measurement by the physical quantity measurement unit such as temperature is performed. Display change control means for increasing the numerical display range of the information pointer display units 16 and 18 so as to suppress the rotational drive range of the small hand (information pointer) 5 that is rotationally driven according to a change in value, temperature, etc. Since there is a pointer position control means for pointing the measured value of the physical quantity with a scale corresponding to the numerical range displayed on the display units 16 and 18 by the small needle (information pointer) 5, even if the battery level is lowered An electronic timepiece can be provided in which the movement of the hands is not lost as far as possible.

  In addition, when the voltage detected by the voltage detection unit (voltage detection means) 23 is equal to or lower than a predetermined set voltage (for example, low (LOW)), the small needle (information pointer) 5 is set to a predetermined value on the scale unit 8. Pointer stopping means for stopping at an angular position pointing to the scale of the display, and the display changing means fixes the difference in the numerical display range of the display unit to a predetermined value so that the information pointer 5 is set to the predetermined scale of the scale unit 8. Even when the battery level is extremely low, the function of the small needle (information pointer) 5 is achieved even when the battery level is extremely low by stopping at the angular position indicating Can be substantially continued.

  Further, the numerical display displayed and designated on the display unit is configured to be the maximum value and the minimum value of the scale part, so that the scale part can be easily identified.

  In addition, the display unit is configured by two display units that display each separately, and each display unit is configured to display the maximum value and the minimum value of the measurement display that can indicate the scale of the scale unit by the information pointer. As a result, the degree of freedom in the arrangement and arrangement of the display unit is increased.

  In addition, this invention is not restricted to the said form, A various change is possible. For example, in the present embodiment, the display target is described as temperature, but is not limited thereto, and may be a physical quantity such as atmospheric pressure or altitude. The measurement interval may not be 2 minutes and 2 seconds. For example, in the altitude measurement function, the first 10 minutes when the altitude measurement is set may be measured once every 5 seconds, and then once every 2 minutes. In that case, once every 2 minutes, Display range switching according to the battery level may be applied. Furthermore, a battery (primary battery) may be used instead of the secondary battery 22a. In that case, the solar cell 21 becomes unnecessary.

  In this case, since the physical quantity is any one of temperature, altitude, and atmospheric pressure, various physical quantities can be displayed on the electronic timepiece.

Although the embodiment of the present invention has been described, the scope of the present invention is not limited to the above-described embodiment, and is included in the invention described in the claims and the equivalent scope thereof. Hereinafter, the invention described in the scope of claims of the present application will be appended.
[Appendix]
<Claim 1>
A physical quantity measuring means for measuring the physical quantity;
An information guide that is rotated by a motor and points to a physical quantity measurement value;
A scale portion on which a scale for indicating the measured value measured by the physical quantity measuring means by the information guide is displayed;
By the information guideline, a display unit for designating the vertical range of the physical quantity measurement value that can be indicated by indicating the scale of the scale unit by numerical display;
A battery for supplying power to the motor;
Voltage detecting means for detecting the voltage of the battery;
The display unit indicated by the information pointer so as to suppress a rotation driving range of the information pointer rotated according to a change in the measurement value by the physical quantity measuring unit when a voltage detection value by the voltage detecting unit is reduced. Display change control means for increasing the numerical display range of
Pointer position control means for pointing the measured value of the physical quantity with the scale according to the range of the numerical value displayed on the display unit by the information pointer;
An electronic timepiece characterized by comprising:
<Claim 2>
When the voltage detected by the voltage detection means is equal to or lower than a predetermined set voltage, the display changer further comprises a pointer stop means for stopping the information pointer at a position indicating a predetermined scale of the scale portion. The control unit is configured to measure the physical quantity measurement unit in a state in which the difference between the numerical display ranges on the display unit is fixed to a predetermined value and the information pointer is stopped at a position indicating the predetermined scale of the scale unit. The electronic timepiece according to claim 1, wherein the measured value is indicated.
<Claim 3>
The electronic timepiece according to claim 1, wherein the numerical display displayed and specified on the display unit is a maximum value and a minimum value of physical quantity measurement values that allow the scale of the scale unit to be indicated by the information pointer.
<Claim 4>
The said display part is comprised by two display parts which each display the maximum value and minimum value of the physical-quantity measured value which can point the scale of the said scale part with the said information pointer | guide, respectively. Electronic clock.
<Claim 5>
2. The electronic timepiece according to claim 1, wherein the physical quantity is any one of temperature, altitude, and atmospheric pressure.

1 Electronic clock 3 Minute hand 4 Hour hand 5 Small hand (information pointer)
6 Watch case 7 Dial 8, 80 Scale unit 10 First wheel train mechanism 11 Second wheel train mechanism 12 First motor 13 Second motor 14 Drive circuit 15 Drive circuit 16, 160 First LCD (display unit)
17 Drivers 18, 180 Second LCD (display unit)
19 Driver 21 Solar cell 22 Power source 22a Secondary battery 23 Voltage detection unit (voltage detection means)
24 Temperature sensor (physical quantity measuring means)
25 Temperature sensor controller (physical quantity measuring means)
30 CPU (display change control means, pointer position control means, pointer stop means)
31 RAM
32 ROM
33 Transmission Circuit 34 Frequency Dividing Circuit 35 Timekeeping Circuit 40 Operation Unit 41 Buzzer Circuit 42 Speaker

Claims (5)

A physical quantity measuring means for measuring the physical quantity;
An information guide that is rotated by a motor and points to a physical quantity measurement value;
A scale portion on which a scale for indicating the measured value measured by the physical quantity measuring means by the information guide is displayed;
By the information guideline, a display unit for designating the vertical range of the physical quantity measurement value that can be indicated by indicating the scale of the scale unit by numerical display;
A battery for supplying power to the motor;
Voltage detecting means for detecting the voltage of the battery;
The display unit indicated by the information pointer so as to suppress a rotation driving range of the information pointer rotated according to a change in the measurement value by the physical quantity measuring unit when a voltage detection value by the voltage detecting unit is reduced. Display change control means for increasing the numerical display range of
Pointer position control means for pointing the measured value of the physical quantity with the scale according to the range of the numerical value displayed on the display unit by the information pointer;
An electronic timepiece characterized by comprising:   When the voltage detected by the voltage detection means is equal to or lower than a predetermined set voltage, the display changer further comprises a pointer stop means for stopping the information pointer at a position indicating a predetermined scale of the scale portion. The control unit is configured to measure the physical quantity measurement unit in a state in which the difference between the numerical display ranges on the display unit is fixed to a predetermined value and the information pointer is stopped at a position indicating the predetermined scale of the scale unit. The electronic timepiece according to claim 1, wherein the measured value is indicated.   The electronic timepiece according to claim 1, wherein the numerical display displayed and specified on the display unit is a maximum value and a minimum value of physical quantity measurement values that allow the scale of the scale unit to be indicated by the information pointer.   The said display part is comprised by two display parts which each display the maximum value and minimum value of the physical-quantity measured value which can point the scale of the said scale part with the said information pointer | guide, respectively. Electronic clock.   2. The electronic timepiece according to claim 1, wherein the physical quantity is any one of temperature, altitude, and atmospheric pressure.

Images