JP6120630B2 - Electronic analog measurement display - Google Patents

Description

  The present invention relates to an electronic analog measurement display.

  In a portable electronic analog measurement display, when the timing of measurement by the measurement device and the timing of driving the analog display overlap, there are cases where the power supply voltage is insufficient or a measurement error occurs. However, if the driving of the analog display is simply stopped at the timing of measurement by the measuring instrument, the driving analog display is temporarily stopped, giving an unnatural impression to the user.

  In this regard, in Patent Document 1, when the driving of the display hand is not completed, analog measurement including a control unit that prohibits the operation of the measuring unit until the display position of the display hand matches the measurement result. The vessel is described.

  In the present specification, the analog measurement display device is a device in which a measurement device and a display device for displaying the measurement result are integrated, and the display on the display device is an analog display. Here, analog display refers to information that displays information according to the posture of the mechanical member, that is, its position and rotation angle, and so-called rotary pointers, disks, retrogrades, etc. are analog displays referred to in this specification. is there. Further, the electronic analog measurement display means an electronic measurement display that is electronically controlled and operated.

Japanese Patent No. 3508278

  In the technique disclosed in Patent Document 1, it is necessary to determine whether or not the display needle is driven at every measurement timing, and to switch permission / prohibition of the operation of the measuring unit, which is somewhat complicated as a system. Further, the measurement timing is a predetermined fixed period and cannot be changed, and lacks flexibility such as occurrence of a timing at which measurement is not performed.

  Therefore, the present invention can perform measurement without stopping the analog display in operation with a simple configuration in the electronic analog measurement display, and at the same time, by applying such configuration, wasted waiting time. The purpose is to provide a highly flexible technology that can eliminate power consumption, maintain measurement intervals, and save power.

  The invention disclosed in the present application in order to solve the above problems has various aspects, and the outline of typical aspects of the aspects is as follows.

A measuring device for repeatedly measuring a physical quantity of arbitrary, and an analog display for analog display the measured values by the measuring instrument, at the time or the measurement completion time of measurement by the measuring instrument, the period until the next measurement have a, and a controller for determining, the controller is the measurement by the measurement instrument, sets the constant predetermined period as the period until the next measurement if a second or subsequent repetition measurement, the An electronic analog measurement display that sets an initial period longer than the steady period as a period until the next measurement when the measurement by the measuring instrument is the first of repeated measurements .

According to aspects of the present invention, a measurement without pause analog indicator being driven halfway by a very simple configuration can line Ukoto.

It is a common front view of the electronic analog measurement display which concerns on each embodiment of this invention. It is a common system block diagram of the electronic analog measurement display which concerns on each embodiment of this invention. It is a timing chart explaining operation | movement of the electronic analog measurement display apparatus in the 1st Embodiment of this invention. It is a flowchart which shows control of the controller about the direction measurement in the 1st Embodiment of this invention. It is a timing chart explaining operation | movement of the electronic analog measurement display apparatus in the 2nd Embodiment of this invention. It is a timing chart explaining operation | movement of the electronic analog measurement display apparatus in the 2nd Embodiment of this invention. It is a flowchart which shows control of the controller about the direction measurement in the 2nd Embodiment of this invention. It is a timing chart explaining operation | movement of the electronic analog measurement display apparatus in the 3rd Embodiment of this invention. It is a flowchart which shows control of the controller 12 about the direction measurement in the 3rd Embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a common front view of an electronic analog measurement display 1 according to each embodiment of the present invention, and FIG. 2 is a common system block diagram of the electronic analog measurement display 1 according to each embodiment of the present invention. It is. Although the first embodiment to the third embodiment will be described later separately, FIG. 1 and FIG. 2 are common to both embodiments.

  In the embodiment shown in FIG. 1, the electronic analog measurement display 1 is a wristwatch, and the function as the measurement display is implemented as an additional function of the wristwatch. However, the function as a clock may be omitted and the measurement display unit alone may be used.

  The electronic analog measurement display 1 has a structure in which various mechanisms for exhibiting a function as a measurement display and a function as a watch are accommodated in a case 2. On the front of the case 2, there are a dial 3 covered with a windshield (not shown because of transparency), hands 4 indicating hours, minutes and seconds, date display 5 and other members relating to functions as a clock, analog An azimuth hand that is a display and an azimuth display 7 (four places) that is a display scale are provided. As can be inferred from the figure, the electronic analog measurement display 1 is an electronic compass, and by measuring the direction of geomagnetism, the direction hand 6 points to a specific direction, in this case north.

  In the case 2, the band 8 is attached to the band fixing portion 2a provided at the 12 o'clock position and the 6 o'clock position. Further, a crown 9 and a push button 10 are provided at the 3 o'clock position of the case 2.

  Note that the design of the case 2 shown in FIG. 1 and the design, arrangement, type, and the like of the members related to the function as a watch are merely examples, and how to do this is arbitrary. Moreover, the electronic analog measurement display 1 is not limited to an electronic compass, and any physical quantity to be measured and its display may be arbitrary. Examples other than the electronic compass include a barometer (or altimeter), a water pressure gauge (or a depth meter), a thermometer, an illuminometer, a dosimeter, and the like. .

  As shown in FIG. 2, in the electronic analog measurement display 1, the measurement result from the geomagnetic sensor 11 that is a measurement instrument is input to the controller 12, and the display 12 pulse motor 13 is driven by the controller 12, thereby 6 is driven to rotate. Further, the controller 12 has a clock circuit 12a, and measures the current time and date. The timepiece pulse motor 14 is driven based on the time measurement result of the timepiece circuit 12a, whereby the hands 4 and the date display 5 are rotationally driven. In addition, operation information from the crown 9 or the push button 10 is input to the controller 12. Electric power is supplied from the battery 15 to the geomagnetic sensor 11, the controller 12, the display pulse motor 13, and the clock pulse motor 14 as necessary.

  The controller 12 shown here does not necessarily need to be a single member, and may be an integrated circuit of various circuits such as an appropriate IC (Integrated Circuits) and an oscillation circuit, and various electronic components such as an amplifier. . The display pulse motor 13 and the clock pulse motor 14 do not necessarily have to be a single motor, and a plurality of motors may be provided as necessary. Further, the battery 15 may be either a primary battery or a secondary battery. However, when the battery 15 is a secondary battery, it is preferable to further include a power generation mechanism such as a solar battery so that the battery 15 can be charged.

  Furthermore, common specifications are described for the first to third embodiments of the present invention.

  First, the azimuth measurement by the electronic analog measurement display 1 is started when the push button 10 (one of which is determined in the case of a plurality of push buttons) is depressed, and is ended when the push button 10 is depressed again. To do. During the azimuth measurement, it is scheduled to measure the geomagnetic azimuth by the geomagnetic sensor 11 at a constant period, in this case, every second, and the measurement result is immediately reflected on the azimuth needle 6. The azimuth needle 6 is rotationally driven by the display pulse motor 13, and the number of pulses to be input to the display pulse motor 13 in order to rotate the azimuth needle 6 is 120. That is, every time one pulse is input to the display pulse motor 13, the azimuth 6 rotates 3 °. Further, the pulse speed input to the display pulse motor 13 is 32 Hz unless special control is performed.

  Of course, the specification shown here is an example of the electronic analog measurement display 1 and is not limited to this. The description of the first to third embodiments described below is made based on such specifications. However, when this specification is changed, the description of each embodiment should be modified and interpreted accordingly. .

  FIG. 3 is a timing chart for explaining the operation of the electronic analog measurement display 1 in the first embodiment of the present invention. This figure shows an example of the operation timing of the push button 10, the geomagnetic sensor 11, and the display pulse motor 13. When each chart is high, it indicates that a signal or pulse is being output or is operating, In this case, there is no signal output or the operation is stopped.

  When the push button 10 is pressed, the azimuth measurement is started, and the controller 12 causes the geomagnetic sensor 11 to execute the first geomagnetic azimuth measurement (reference numeral 100). When the measurement of the geomagnetic azimuth is completed, the number of pulses necessary for rotating the azimuth needle 6 from the current position to the position indicating the north azimuth obtained as a result of the measurement is calculated, and is necessary for the pulse motor 13 for the display. As many pulses as possible are output (reference numeral 101). At this time, the required number of pulses is not determined because it depends on the direction of the electronic analog measurement display 1. Therefore, at the maximum, the azimuth needle 6 must be rotated by a half turn.

  At this time, as explained in the common specification, in order to rotate the azimuth needle 6 by 180 °, 60 pulses that are half of 120 pulses are necessary, and the time required for this is 1 because the pulse speed is 32 Hz. 875 seconds. As described in the common specification, since the measurement of the geomagnetic direction by the geomagnetic sensor 11 is scheduled every second, it is displayed at the time one second after the first geomagnetic direction measurement (reference numeral 100). The device pulse motor 13 is still being driven (reference numeral 102). This situation occurs when the number of pulses necessary to rotate the azimuth needle 6 is 32 or more, that is, when the rotation angle of the azimuth needle 6 is 96 ° or more.

  Therefore, in the present embodiment, the period until the next geomagnetic bearing measurement is limited only to the first geomagnetic bearing measurement (that is, the first measurement in the repeated measurement of the geomagnetic bearing that is started by pressing the push button 10). Is set to 2 seconds longer than the normal 1 second. Thereby, the second geomagnetic orientation measurement is performed at a time point 2 seconds after the first geomagnetic orientation measurement (reference numeral 100) (reference numeral 103). In the second and subsequent geomagnetic bearing measurements, the period until the next geomagnetic bearing measurement is 1 second as usual.

  This control is based on the following concept. That is, the rotation angle of the azimuth needle 6 after the first geomagnetic azimuth measurement is not fixed, and it is assumed that the azimuth needle 6 is a large angle. If a time interval is set such that the second geomagnetic azimuth measurement is not performed, the movement of the azimuth 6 and the geomagnetic azimuth measurement are not performed simultaneously. After the second geomagnetic azimuth measurement, it is expected that no significant change will occur in the posture of the electronic analog measurement display 1, so that the rotation angle of the azimuth needle 6 remains small and the drive time is 1 second. It will fit within.

  More generally, the above-described control will be described. When the measurement by the measuring instrument is the second or later of the repeated measurement, the period until the next measurement is a predetermined steady period (1 second in the above example). When the measurement by the measuring instrument is the first repeated measurement, the period until the next measurement is set to the first period (2 seconds in the above example) longer than the steady period. Here, the initial period may be a period longer than the maximum value of the time required from the start of measurement to the completion of driving of the azimuth hand 6 that is an analog display.

  Even after the second geomagnetic azimuth measurement, the posture of the electronic analog measurement display 1 is not largely changed, and the timing of the azimuth 6 movement and the geomagnetic azimuth measurement may overlap. In such a case, the movement of the azimuth needle 6 or the geomagnetic azimuth measurement should be suspended.

  FIG. 4 is a flowchart showing the control of the controller 12 for the orientation measurement in the present embodiment. The controller 12 repeatedly executes the control shown in FIG.

  First, in step S01, the controller determines whether or not the push button 10 has been pressed. If it is not depressed, the control is terminated because there is no command for starting the azimuth measurement by the user.

  If it is determined in step S01 that the push button 10 has been pressed, the process proceeds to step S02 in order to start repeated orientation measurement. In step S02, the geomagnetic direction is measured by the geomagnetic sensor 11. After the end of geomagnetic azimuth measurement or if geomagnetic azimuth measurement is started, the process proceeds to step S03 to determine whether or not the current geomagnetic azimuth measurement is the first measurement in the azimuth measurement. If it is the first measurement, the process proceeds to step S04, where 2 seconds is set as the time interval until the next geomagnetic bearing measurement. Otherwise, the process proceeds to step S05, where the time interval until the next geomagnetic bearing measurement is set. Set 1 second. In any case, the process proceeds to step S06.

  In step S06, a necessary number of pulses are output to the pulse motor 13 for display, and the direction hand 6 is rotated. The number of pulses output at this time is calculated as the number of pulses required to rotate the current direction of the azimuth hand 6 to the measured north direction. The direction in which the azimuth 6 reaches the target angle in a shorter time is selected.

  In step S07, it is determined whether or not the push button 10 has been pressed again. If it is depressed, the user has issued a command to end the azimuth measurement, and thus the control is terminated. Otherwise, the process proceeds to step S08.

  In step S08, it is determined whether the time interval set in step S04 or step S05 has elapsed and the measurement timing has come. If it is not the measurement timing, the process returns to step S07 and repeats until the push button 10 is pressed again or the measurement timing comes. If the measurement timing has arrived, the process returns to step S02, and the next geomagnetic bearing measurement is executed.

  As described above, in the present embodiment, the controller 12 sets the time interval until the geomagnetic measurement of the magnetic field based on the simple determination whether the geomagnetic azimuth measurement by the geomagnetic sensor 11 is the first measurement in the azimuth measurement. Since such control is very simple, it can be easily realized. That is, in the present embodiment, measurement can be performed without stopping the analog display device (azimuth hand 6) being driven halfway with a very simple configuration.

  FIG. 5 is a timing chart for explaining the operation of the electronic analog measurement display 1 according to the second embodiment of the present invention. This figure also shows an example of the operation timing of the push button 10, the geomagnetic sensor 11, and the display pulse motor 13. When each chart is high, it indicates that a signal or pulse is being output or is in operation. In this case, there is no signal output or the operation is stopped.

  When the push button 10 is pressed, the azimuth measurement is started, and the controller 12 causes the geomagnetic sensor 11 to execute the first geomagnetic azimuth measurement (reference numeral 200). When the measurement of the geomagnetic azimuth is completed, the number of pulses necessary for rotating the azimuth needle 6 from the current position to the position indicating the north azimuth obtained as a result of the measurement is calculated, and is necessary for the pulse motor 13 for the display. As many pulses are output (reference numeral 201). At this time, the number of pulses required is not determined because it depends on the orientation of the electronic analog measurement display 1, and at the maximum, the number of pulses necessary to rotate the azimuth hand 6 by a half turn, that is, the above-mentioned common number According to the specification, 60 pulses are required. Here, assuming that 48 pulses (144 ° as the rotation angle of the azimuth needle 6) are required, the time required for outputting 48 pulses is 1.5 seconds because the pulse speed is 32 Hz.

  The controller 12 sets the time required for outputting the pulse, that is, the time obtained by adding the time required for the geomagnetic azimuth measurement of the geomagnetic sensor 11 (for example, 0.05 seconds) to the time for driving the azimuth hand 6 to the next time. Compare with 1 second, which is the normal period until geomagnetic bearing measurement. If the time is longer than 1 second, the controller 12 completes the driving of the azimuth hand 6 until the next period from the start of the current geomagnetic direction measurement (reference numeral 200) as the period until the next geomagnetic direction measurement. Set a value that points to the value. Here, when the period designated by the controller 12 is called an extension period and a normal time interval (here, 1 second) is called a stationary period, from the start of geomagnetic bearing measurement indicated by reference numeral 200, It takes 1.55 seconds until the pulse output indicated by reference numeral 201 is completed, and the controller 12 sets the expansion period because it is longer than the steady period. The extension period is always longer than the steady period, and may be longer than the period from the start of geomagnetic azimuth measurement until the driving of the azimuth needle 6 is completed. A constant value may always be specified as the extension period (in this case, 0.05 seconds required for geomagnetic bearing measurement is added to 1.875 seconds which is the maximum driving time of the bearing needle 6. In the present embodiment, the extension period is determined according to the time required until the azimuth hand 6 indicates the measurement value. In the example shown in FIG. 5, 1.55 seconds, which is the time required for the driving of the azimuth hand 6 to be completed, is specified.

  As a result, the second geomagnetic orientation measurement (reference numeral 202) is executed simultaneously with the completion of the pulse output indicated by reference numeral 201. At this time, as indicated by reference numeral 203, when the time required for completing the driving of the azimuth needle 6 is less than the stationary period, the controller 12 sets 1 second which is the stationary period as the period until the next geomagnetic bearing measurement. Set. The second geomagnetic orientation measurement (reference numeral 202), the third geomagnetic orientation measurement (reference numeral 204), and the fourth geomagnetic orientation measurement (reference numeral 205) are executed every second as a result of setting the stationary period. Is done.

  In the example shown in FIG. 5, as a result of the fourth geomagnetic orientation measurement (reference numeral 205), 40 pulses are required to be output, and 1.25 seconds are required to output such a pulse (reference numeral 206). In this case, the controller 12 again sets 1.3 seconds obtained by adding 0.05 seconds to 1.25 seconds as the extension period.

  In this way, by setting the extension period according to the time required to complete the driving of the azimuth hand 6, the dead time, that is, the steady period has been missed, and after the driving of the pulse motor 13 for display is completed. In addition, the time until the next geomagnetic direction measurement timing arrives can be shortened or eliminated.

  Further, in the present embodiment, the controller 12 sets the number of consecutive times that is the number of consecutive times shorter than a predetermined threshold time, for example, 0.25 seconds corresponding to 8 pulses, to the driving completion of the direction hand 6. When the number of consecutive times exceeds a certain number, for example, 3 times, a power saving extension period longer than the steady period is set as the period.

  For example, as shown in FIG. 6, if the driving time of the azimuth 6 is shorter than 0.25 seconds as a result of three consecutive geomagnetic azimuth measurements (reference numerals 207, 208, and 209), the controller 12 As a period until the next geomagnetic bearing measurement of the geomagnetic bearing measurement indicated by reference numeral 209, a power saving extension period of 3 seconds is set. As a result, the next geomagnetic bearing measurement of the geomagnetic bearing measurement indicated by reference numeral 209 is three seconds later (reference numeral 210).

  In this control, when the state in which the azimuth needle 6 hardly moves is continued for a certain period of time, it is determined that there is almost no change in the posture of the electronic analog measurement display 1, and the interval for executing the geomagnetic azimuth measurement is increased. This reduces power consumption. Of course, when the driving time of the azimuth needle 6 exceeds the threshold time, the continuous number is reset.

  FIG. 7 is a flowchart showing the control of the controller 12 for the orientation measurement in the present embodiment. The controller 12 repeatedly executes the control shown in FIG.

  First, the controller 12 determines whether or not the push button 10 is pressed in step S11. If it is not depressed, the control is terminated because there is no command for starting the azimuth measurement by the user.

  If it is determined in step S11 that the push button 10 has been pressed, the process proceeds to step S12 to start repeated azimuth measurement, and the geomagnetic sensor 11 performs geomagnetic azimuth measurement. After the end of the geomagnetic azimuth measurement, the process proceeds to step S13, where it is determined whether the time required from the start of measurement until the azimuth hand 6 points to the measurement value (that is, the north azimuth) is shorter than a predetermined threshold time. To do. If it is shorter than the threshold time, the process proceeds to step S14, and 1 is added to the number of consecutive times. Note that the initial value of the number of consecutive times is zero. In subsequent step S15, it is determined whether the number of consecutive times is a predetermined threshold number, here, 3 or more. If it is 3 or more, the process proceeds to step S16, and a power saving extension period is set as a time interval until the next geomagnetism measurement. Set.

  On the other hand, when the time until the operation of the azimuth hand 6 is completed is longer than the threshold time in step S13, the process proceeds to step S17, and the continuous count is reset to zero. Then, the process proceeds to step S18. Also, if it is determined in step S15 that the number of consecutive times is less than the threshold number, the process proceeds to step S18.

  In step S18, it is determined whether the time until the operation of the azimuth needle 6 is completed is longer than the steady period. If it is longer, the process proceeds to step S19, and the extension period is set as the time interval until the next geomagnetism measurement. Otherwise, the process proceeds to step S20, and a stationary period is set as the time interval.

  Regardless of how the time interval is set, the controller 12 moves the process to step S21, outputs the necessary number of pulses to the pulse motor 13 for display, and rotates and moves the azimuth hand 6. The number of pulses output at this time is the number of pulses necessary to rotate the current direction of the azimuth hand 6 to the measured north direction. Further, the direction in which the azimuth needle 6 reaches the target angle in a shorter time is selected.

  In step S22, it is determined whether or not the push button 10 has been pressed again. If it is depressed, the user has issued a command to end the azimuth measurement, and thus the control is terminated. Otherwise, the process proceeds to step S23.

  In step S23, it is determined whether or not the time interval set in step S16, step S19, or step S20 has elapsed and the measurement timing has come. If it is not measurement timing, it returns to step S22 and repeats, and it waits until the pushbutton 10 is pushed down again or measurement timing comes. If the measurement timing has arrived, the process returns to step S12, and the next geomagnetic bearing measurement is executed.

  As described above, in the present embodiment, the controller 12 sets the extension period as a time interval when the time required to complete the operation of the azimuth needle 6 is longer than the steady period. ) Can be measured without being temporarily stopped, and the dead time can be eliminated by determining the extension period according to the time required to complete the operation of the direction hand 6. Further, when the time required to complete the operation of the azimuth hand 6 is shorter than the threshold time and the case where the posture of the electronic analog measurement display 1 is hardly changed continues, the power saving extension period is set as the time interval. Therefore, the frequency of geomagnetism measurement is reduced and power consumption is reduced.

  FIG. 8 is a timing chart for explaining the operation of the electronic analog measurement display 1 according to the third embodiment of the present invention. This figure also shows an example of the operation timing of the push button 10, the geomagnetic sensor 11, and the display pulse motor 13. When each chart is high, it indicates that a signal or pulse is being output or is in operation. In this case, there is no signal output or the operation is stopped.

  When the push button 10 is pressed, the azimuth measurement is started, and the controller 12 causes the geomagnetic sensor 11 to execute the first geomagnetic azimuth measurement (reference numeral 300). When the measurement of the geomagnetic azimuth is completed, the number of pulses necessary for rotating the azimuth needle 6 from the current position to the position indicating the north azimuth obtained as a result of the measurement is calculated. At this time, the number of pulses required is not determined because it depends on the orientation of the electronic analog measurement display 1, and at the maximum, the number of pulses necessary to rotate the azimuth hand 6 by a half turn, that is, the above-mentioned common number According to the specification, 60 pulses are required. Here, assuming that 48 pulses (144 ° as the rotation angle of the azimuth needle 6) are required, the time required to output 48 pulses is 1.5 seconds if the pulse speed is 32 Hz as described above. It becomes.

  In the present embodiment, the controller 12 adds the time required to output this pulse, that is, the time required to drive the azimuth needle 6 to the time required to measure the geomagnetic azimuth of the geomagnetic sensor 11 (for example, 0.05 seconds). The time is compared with 1 second, which is a normal period until the next geomagnetic orientation measurement, and when it is longer than 1 second, the time required for pulse output is shortened by changing the pulse output speed. That is, the operating speed of the azimuth hand 6 is changed to a higher speed by changing the pulse speed scheduled as a normal specification to a higher pulse speed.

  Here, if the period (here 1 second) from geomagnetic bearing measurement to the next geomagnetic bearing measurement is referred to as a stationary period, the controller 12 will start from the start of the geomagnetic bearing measurement until the stationary period elapses. The operation speed of the direction needle 6 is selected so that the operation of the direction needle 6 is completed. Here, the completion of the operation of the azimuth needle 6 means that the movement of the azimuth needle 6 to the position indicating the measurement result ends, and here, the north direction obtained as a result of the measurement is defined as the azimuth needle 6. The operation of the azimuth needle 6 is completed by rotating until it indicates.

  In the example shown here, the controller 12 can switch the pulse speed output to the display-use pulse motor 13 from 32 Hz in the steady state to double 64 Hz by appropriately switching on / off the multiplier. It is configured as follows. In this case, assuming that the pulse speed is 64 Hz, 0.9375 seconds are required for the output of 60 pulses, which is the maximum number of pulses necessary for driving the azimuth needle 6, and 005 necessary for geomagnetic azimuth measurement. If seconds are added, it becomes 0.9875 seconds, which is less than 1 second which is a steady period. In the illustrated example, since 48 pulses are output at 64 Hz, the output of the pulse indicated by reference numeral 301 requires 0.75 seconds.

  In the example shown in the figure, since the time required to complete the operation of the azimuth needle 6 does not exceed the steady period in the second and subsequent measurements, the pulse speed of the pulse output to the display pulse motor 13 is the usual 32 Hz. However, if the amount of rotation of the azimuth needle 6 temporarily increases due to a sudden change in posture on the electronic analog measurement display 1, the controller 12 changes the pulse speed as appropriate. .

  In this way, by changing the operating speed of the analog display (in this example, the azimuth needle 6), the stationary analog display is temporarily stopped while maintaining a steady period and performing measurement at a constant interval. Measurements can be made without doing so.

  Also in the present embodiment, the controller 12 determines the number of consecutive times that the time required for completing the operation of the azimuth needle 6 is a predetermined threshold time, for example, the number of consecutive states shorter than 0.25 seconds corresponding to 8 pulses. The power consumption is reduced by setting a power saving extension period longer than the steady period as a period when the number of consecutive times exceeds a certain number, for example, three times. Since the operation at this time is the same as that described with reference to FIG. 6 in the previous embodiment, the description thereof will be omitted.

  FIG. 9 is a flowchart showing the control of the controller 12 for the orientation measurement in the present embodiment. The controller 12 repeatedly executes the control shown in FIG.

  First, in step S31, the controller determines whether or not the push button 10 has been pressed. If it is not depressed, the control is terminated because there is no command for starting the azimuth measurement by the user.

  If it is determined in step S31 that the push button 10 has been pressed, the process proceeds to step S32 in order to start repeated azimuth measurement, and the geomagnetic sensor 11 performs geomagnetic azimuth measurement. After the end of the geomagnetic azimuth measurement, the process proceeds to step S33, and it is determined whether or not the time required from the start of measurement until the azimuth hand 6 indicates the measurement value (that is, the north azimuth) is shorter than a predetermined threshold time. to decide. If it is shorter than the threshold time, the process proceeds to step S34, and 1 is added to the continuous number. Note that the initial value of the number of consecutive times is zero. In subsequent step S35, it is determined whether the number of consecutive times is a predetermined threshold number, which is 3 or more in this case. If it is 3 or more, the process proceeds to step S36, and a power saving extension period is set as a time interval until the next geomagnetism measurement. In addition to setting, the usual pulse rate of 32 Hz is set.

  On the other hand, when the time until the operation of the azimuth hand 6 is completed is longer than the threshold time in step S33, the process proceeds to step S37, and the continuous count is reset to zero. Then, the process proceeds to step S38. Also, if it is determined in step S35 that the number of consecutive times is less than the threshold number, the process proceeds to step S38.

  In step S38, it is determined whether or not the time until the operation of the azimuth needle 6 is completed is longer than the steady period. If it is longer, the process proceeds to step S39, where the stationary period is set as the time interval until the next geomagnetism measurement, and the faster pulse speed is set to 64 Hz. Otherwise, the process proceeds to step S40, where the stationary period is set as the time interval, and the usual 32 Hz is set as the pulse speed.

  Regardless of how the time interval and pulse speed are set, the controller 12 moves the process to step S41, outputs the necessary number of pulses at the pulse speed set in the pulse motor 13 for display, and 6 is rotated. The number of pulses output at this time is the number of pulses necessary to rotate the current direction of the azimuth hand 6 to the measured north direction. Further, the direction in which the azimuth needle 6 reaches the target angle in a shorter time is selected.

  In step S42, it is determined whether or not the push button 10 has been pressed again. If it is depressed, the user has issued a command to end the azimuth measurement, and thus the control is terminated. Otherwise, the process proceeds to step S43.

  In step S43, it is determined whether the time interval set in step S36, step S39, or step S40 has elapsed and the measurement timing has come. If it is not measurement timing, it returns to step S32 and repeats, and it waits until the pushbutton 10 is pushed down again or measurement timing comes. If the measurement timing has arrived, the process returns to step S32, and the next geomagnetic direction measurement is executed.

  As described above, in this embodiment, the controller 12 changes the operation speed of the azimuth needle 6 when the time required to complete the operation of the azimuth needle 6 is expected to be longer than the steady period. Measurement can be performed without temporarily stopping the instrument (azimuth needle 6) halfway, and the measurement period can be kept constant as in the steady period. Further, when the time required to complete the operation of the azimuth hand 6 is shorter than the threshold time and the case where the posture of the electronic analog measurement display 1 is hardly changed continues, the power saving extension period is set as the time interval. Therefore, the frequency of geomagnetism measurement is reduced and power consumption is reduced.

  Each embodiment described above is an example in carrying out the present invention, and the present invention is not limited to the specific configuration shown here. Those skilled in the art may make appropriate modifications to these embodiments and change the shape, arrangement, number, material, and the like. The illustrated flowchart is an example for realizing the functions to be exhibited in the embodiment, and different controls may be employed as long as the same functions can be realized. The technical scope of the present invention is defined based on the description of the scope of claims, and may include those obtained by appropriately modifying these embodiments.

  1 Electronic analog measurement display, 2 case, 2a band fixing part, 3 dial, 4 pointer, 5 date display, 6 azimuth hand, 7 azimuth display, 8 band, 9 crown, 10 push button, 11 geomagnetic sensor, 12 controller , 12a Clock circuit, 13 Pulse motor for display, 14 Pulse motor for clock, 15 Battery.

Claims (1)

A measuring instrument that repeatedly measures any physical quantity;
An analog display for analog display of measured values measured by the measuring instrument;
A controller for determining a period until the next measurement at the time of measurement by the measuring instrument or at the time of completion of the measurement;
Have
The controller is
If the measurement by the measuring instrument is the second or later of the repeated measurement, set a predetermined stationary period as a period until the next measurement,
If the measurement by the measuring instrument is the first time of repeated measurement, set the initial period longer than the stationary period as the period until the next measurement ,
Electronic analog measurement indicator.

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