JP2011027516A - Electronic azimuth meter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electronic azimuth meter enabling a user to recognize intuitively the degree in which a measured magnetic north direction is to be corrected, when performing calibration processing of an azimuth shown by a pointer in north azimuth correction. <P>SOLUTION: This azimuth meter is equipped with a crown switch operable from the outside. In a mode for the north azimuth correction, whenever a rotation operation signal is generated from the crown switch (S41, S42), the pointer is rotated by one step in a forward direction or in a backward direction (S45, S46), and a correction value β stored in an azimuth correction value storage part is changed by each one step angle (±6°) repeatedly. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an electronic azimuth meter having an azimuth correction function.

  2. Description of the Related Art Conventionally, an electronic azimuth meter has been known in which a azimuth is detected by using a magnetic sensor that electrically detects geomagnetism, and a pointer is electrically driven or a display output is performed to indicate a specific azimuth.

  Also, in such an electronic azimuth meter, there is a case where a deviation always occurs in the indicated direction by a substantially constant angle. Therefore, a correction technique called a north azimuth correction is put into practical use in order to eliminate such a deviation in the indicated direction. (For example, Patent Document 1).

  The north direction correction can be performed in a situation where a reference direction such as magnetic north is separately provided. In the north azimuth correction, after the electronic azimuth meter is set to the north azimuth correction setting mode, the electronic azimuth meter is stopped in a state of being directed to a reference direction such as magnetic north, and the processing start operation is performed in this state. Then, the direction of magnetic north is calculated by the electronic azimuth meter, and the amount of deviation between both directions is calculated from the calculated magnetic north direction and the exact magnetic north direction to which the electronic azimuth meter is directed. The Then, the amount of deviation is stored as an azimuth correction value, and the north azimuth correction setting process ends.

  In the subsequent azimuth measurement processing, the angle of the azimuth correction value is added to the detected direction of geomagnetism, and the corrected magnetic north azimuth is obtained. Then, the corrected specific orientation is indicated.

Japanese Patent No. 3467777 (page 10, paragraphs 0051-0052)

  However, in the conventional north azimuth correction, the amount of deviation in the indicated direction is automatically calculated and automatically stored as the azimuth correction value. There is a problem that it is difficult to recognize whether the correction is performed or how much angle is corrected.

  The present invention provides an electronic azimuth meter that allows the user to intuitively recognize how much correction is performed with respect to the detection direction when the direction of the electronic azimuth meter is corrected. It is in.

In order to achieve the above object, the invention according to claim 1
Geomagnetism detecting means for detecting the direction of geomagnetism,
Correction value storage means for storing the correction value of the azimuth display;
Azimuth calculating means for obtaining a specific azimuth by correcting the detection result of the geomagnetism detecting means based on the correction value;
A direction indicator that indicates a specific direction obtained by the direction calculation means, comprising a pointer provided in a rotatable manner or a plurality of circumferentially arranged display bodies;
In an electronic compass with
Switch means that can be operated from the outside;
A correction angle changing means for changing the direction indicated by the azimuth display means by a predetermined angle based on an operation of the switch means and changing a correction value stored in the correction value storage means in response to the change; ,
It is characterized by having.

The invention according to claim 2 is the electronic azimuth meter according to claim 1,
The switch means is a crown switch that generates a rotation operation signal every time the crown is rotated by a predetermined angle.
The correction angle changing means changes the direction indicated by the azimuth display means by a predetermined angle each time a rotation operation signal is generated from the crown switch, and changes the correction value stored in the correction value storage means. It is characterized by changing the value corresponding to the predetermined angle.

The invention according to claim 3 is the electronic azimuth meter according to claim 2,
The crown switch is configured to electrically distinguish between a state in which the crown is pulled out and a state in which the crown is pushed back.
Further, when it is determined that the crown has been pulled out, a correction angle changing process for changing the indication direction of the azimuth display means by the correction angle changing means and the correction value of the correction value storage means according to an operation. And a processing control means for ending the correction angle changing process by the correction angle changing means when it is determined that the crown has been pushed back.

According to a fourth aspect of the present invention, in the electronic azimuth meter according to the third aspect,
The processing control means includes
When it is determined that the crown has been pulled out, while stopping the process of pointing a specific direction by the direction display means based on the detection result of the geomagnetic detection means,
When it is determined that the crown has been pushed back, the direction display means restarts the process of pointing a specific direction based on the detection result of the geomagnetism detection means.

The invention according to claim 5 is the electronic azimuth meter according to claim 1,
The bearing calculation means
The configuration is characterized in that a direction obtained by adding an angle represented by the correction value to the direction of geomagnetism as a detection result of the geomagnetism detection means is obtained as the specific orientation.

  According to the present invention, when the user operates the switch means, the direction indicated by the azimuth display means is changed by a predetermined angle, and the correction value of the correction value storage means is changed to correspond to this change. Therefore, the user can intuitively and easily recognize how the correction is performed in the subsequent azimuth measurement and at what angle the correction of the designated direction is performed.

It is a top view which shows the external appearance of the electronic direction meter of embodiment of this invention. It is a block diagram which shows the electric constitution of the electronic azimuth meter of embodiment. It is a flowchart which shows the procedure of the main control process performed by CPU. It is a flowchart which shows the control procedure of the azimuth | direction measurement process performed by step S12 of FIG. It is a flowchart which shows the control procedure of the north correction process performed by step S39 of FIG. It is explanatory drawing which shows operation | movement of the pointer | guide in a north correction process. It is a top view which shows the other structural example of an electronic azimuth meter.

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

  FIG. 1 is a plan view showing an appearance of an electronic compass according to an embodiment of the present invention, and FIG. 2 is a block diagram showing an electrical configuration of the electronic compass.

  The electronic azimuth meter 100 of this embodiment is a device that electrically detects the direction of geomagnetism and indicates a specific direction (for example, magnetic north or true north) with a pointer 104 for display. The pointer 104 is configured to be electrically driven to rotate on the dial plate 101, and is controlled so as to always indicate a specific direction when measuring the direction. Although not particularly limited, the electronic azimuth meter 100 is a wristwatch-type device that also functions as an electronic timepiece that displays time with three hands 102 to 104.

  As shown in FIG. 1, the electronic azimuth meter 100 is provided with an operation button 108 capable of inputting an operation command from the outside and a crown switch 110 as a switch means on the outer peripheral portion of the casing. It has been. The crown switch 110 can pull out and push back the crown 110a portion of the head. By pulling out, the connection of the internal contacts is switched, and these states are electrically transmitted to the control circuit 45. It has become. The crown switch 110 rotates the crown 110a with the crown 110a of the head pulled out, so that a rotation operation signal is generated every rotation of the crown 110a by a predetermined angle, and is output to the control circuit 45. It has become so.

  As shown in FIG. 2, the electronic azimuth meter 100 includes a second hand drive unit 41 that independently drives the pointer 104 to rotate, an hour / minute hand drive unit 42 that drives the hands 102 and 103 to rotate, and a time. An oscillation circuit 48 and a frequency dividing circuit 49 that generate a signal with a constant period for counting, a time counting circuit 44 that counts time based on the signal with a constant period of the frequency dividing circuit 49, and a detection signal corresponding to the direction of geomagnetism. The azimuth sensor 53 to output, the azimuth detection unit 54 that generates detection data representing the direction of geomagnetism by synthesizing the detection signals of the azimuth sensor 53, the operation unit 51 having the operation buttons 108 and the crown switch 110, and the CPU (Central processing unit) and a control circuit 45 that controls the entire apparatus, and a ROM (Read Only Mem) that stores control programs and control data executed by the CPU. ory) 46, a RAM (Random Access Memory) 47 that provides a working memory space for the CPU, a power supply unit 50 that supplies an operating voltage to each unit, and the like. Among the above-described configurations, the azimuth display unit is configured by the pointer 104, and the geomagnetic detection unit is configured by the azimuth sensor 53 and the azimuth detection unit 54.

  The second hand drive unit 41 has a stepping motor. When a forward drive pulse or a reverse drive pulse is sent from the control circuit 45, the rotor of the stepping motor rotates forward or backward step by step. Thus, this rotation is transmitted to the pointer 104 via the train wheel mechanism. By sending a drive pulse for one time to the second hand drive unit 41, the pointer 104 rotates and moves one step (for example, ± 6 °) in the forward direction or the reverse direction.

  The hour / minute hand driving unit 42 has a stepping motor separately from the second hand driving unit 41, and when the driving pulse is sent from the control circuit 45, the two hands 102 and 103 are interlocked to rotate step by step. It is configured.

  The direction sensor 53 is formed by, for example, arranging a plurality of magnetoresistive elements that change the magnitude of electric resistance in accordance with the strength of the external magnetic field in different directions. The azimuth sensor 53 outputs a detection signal representing the magnitude of geomagnetism for each direction component by the plurality of magnetoresistive elements. The azimuth detection unit 54 generates detection data representing the direction of geomagnetism by taking a difference between these detection signals and performing comparison or the like. Since the azimuth sensor 53 is fixedly disposed in the housing of the electronic azimuth meter 100, the electronic azimuth meter 100 can be detected with respect to the terrestrial magnetism based on the detection of the geomagnetic direction by the azimuth sensor 53 and the azimuth detection unit 54. It is possible to calculate whether it is facing the direction of.

  The RAM 47 is formed with a second hand position counter for counting the rotational position of the pointer 104 and an hour / minute hand position counter for counting the rotational position of the hands 102 and 103. Further, the RAM 47 is formed with an azimuth correction value storage unit 47a as correction value storage means for storing the azimuth correction value β obtained in the north correction process.

  Next, the operation of the electronic azimuth meter 100 configured as described above will be described with reference to a flowchart.

[Main control processing]
FIG. 3 is a flowchart showing a procedure of main control processing executed by the CPU of the control circuit 45.

  This main control process is a process that is started when the power is turned on and continuously executed thereafter. The main control process includes a process for displaying the time by rotating the three hands 102 to 104 (steps S1 to S10), and a process for measuring and displaying the direction based on the button operation (step S11). , S12).

  In the time display process, the CPU of the control circuit 45 sequentially determines whether or not a 1-second signal has been input from the frequency divider circuit 49 (step S1). When it is determined that a 1-second signal has been input. A process of outputting a drive pulse for one time to the second hand drive unit 41 (step S2), and a process of adding “+1” to the value of the second hand position counter in the RAM 47 in which the rotational position is counted for position recognition of the pointer 104 (Step S3), a process for determining whether or not the second hand position counter has reached a value (for example, “60”) that the pointer 104 has turned once (Step S4). The process of updating to “0” (step S5) is executed.

  Further, when a 1-second signal is input, a process for sequentially determining whether or not a 10-second signal is input from the timing circuit 44 (step S6), and when a 10-second signal is input, the hour / minute hand drive is performed. A process of outputting a drive pulse for one time to the unit 42 (step S7), and a process of adding “+1” to the value of the hour / minute hand position counter in the RAM 47 representing the rotational position for the position recognition of the hands 102 and 103 (step S7). S8), the value of the hour / minute hand position counter is the value at which the hands 102 and 103 rotate once and return to the original position, that is, the pointer 102 indicating the hour digit value is rotated once and the pointer 103 indicating the minute digit value is 12 A process for determining whether or not a rotation value (for example, “4320”) has been reached (step S9), and a process for updating the value of the hour / minute hand position counter to “0” when the rotation value has been reached once. It is.

  With the processing of these steps S1 to S10, the three hands 102 to 104 rotate with the passage of time to display the time.

  On the other hand, if it is determined in step S1 that there is no input signal for 1 second, the process proceeds to step S11, and it is determined whether or not there is an operation input of the operation button 108 for starting azimuth measurement in the step. And if there is no operation input, it will return to step S1 as it is, but if there is an operation input, it will transfer to the direction measurement process of step S12.

[Direction measurement processing]
FIG. 4 shows a flowchart of the azimuth measurement process executed in step S12 of FIG.

  When the azimuth measurement process is started, first, the CPU of the control circuit 45 inputs detection data from the azimuth detection unit 54 and calculates the azimuth of the 12 o'clock position on the dial 101 (step S21). Next, based on this calculation result, an angle α indicating the magnetic north on the dial 101 (an angle with the 12 o'clock position being 0 degree) is obtained (step S22), and further stored in the azimuth correction value storage unit 47a of the RAM 47. The corrected north angle “α + β” is obtained by adding the azimuth correction value β (step S23). A value obtained by converting this angle “α + β” into a value of the needle position on the dial 101 is stored in the azimuth storage unit in the RAM 47 (step S24). The azimuth calculating means is configured by the processing of steps S22 to S24.

  When the converted value of the angle “α + β” is stored in the azimuth storage unit, it is determined which of the clockwise direction and the counterclockwise direction is closer from the current position of the pointer 104 to the position of the movement destination angle “α + β” (step S25). If the right turn is close, the process proceeds to step S26, and if the left turn is close, the process proceeds to step S31.

  As a result, when the right turn is close and the process proceeds to step S26, the pointer 104 is moved to the position of the angle “α + β” by the processing of steps S26 to S30. In other words, one forward rotation drive pulse is sequentially output to the second hand drive unit 41 (step S26), the second hand position counter is updated by "+1" (step S27), and the value of the second hand position counter is rotated once to return to the original value. It is confirmed whether or not the value “60” is returned to the position (step S28). If the value is “60”, the second hand position counter is updated to “0” (step S29), and the process proceeds to the next step. . Next, it is determined whether or not the value of the second hand position counter matches the azimuth position of the angle “α + β” stored in the azimuth storage unit (step S30), and if not, the process returns to step S26. Proceed to S36.

  On the other hand, as a result of the determination process in step S25, if the counterclockwise direction is close and the process proceeds to step S31, the pointer 104 is moved to the position of the angle “α + β” by the processes in steps S31 to S35. In other words, one reverse drive pulse is sequentially output to the second hand drive unit 41 (step S31), the second hand position counter is updated by "-1" (step S32), and the value of the second hand position counter needs to be increased. It is confirmed whether or not “−1” is obtained (step S33). If the value that needs to be raised is "-1", the second hand position counter is updated to "59" (step S34), and then the process proceeds to the next step. . Next, it is determined whether or not the value of the second hand position counter matches the azimuth position of the angle “α + β” stored in the azimuth storage unit (step S35). If so, the process proceeds to step S36.

  Through the processing in steps S25 to S35, the pointer 104 is rotated at a rapid feed to the azimuth position of the angle “α + β” stored in the azimuth storage unit.

  After the pointer 104 is rotated to the azimuth position of the angle “α + β” and the process proceeds to step S36, an appropriate drive pulse is separately applied to the hour / minute hand drive unit 42 in order to separately display the current time using the two hands 102 and 103. Output (step S36). That is, the timing data of the timing circuit 44 and the count value of the hour / minute hand position counter are compared, and the positions of the hands 102 and 103 are corrected so that they are synchronized.

  Next, the CPU of the control circuit 45 determines whether or not the direction measurement end operation has been performed based on the input of the operation unit 51 (step S37). If the end operation has not been performed, it is determined whether or not the operation for pulling out the crown 110a has been performed. (Step S38). If no operation has been performed, the process returns to step S21 and the processing from step S21 is repeated.

  By repeating the processes of steps S21 to S38 at a short time interval (for example, every 1 second), the magnetic north direction measured by the direction sensor 53 and the direction detection unit 54 is corrected by the direction correction value β. In the above, it is always indicated by the pointer 104. The user can recognize the orientation of magnetic north by visually recognizing the position of the pointer 104 on the dial 101.

  If an azimuth measurement end operation is performed during the loop processing of steps S21 to S38, “YES” is determined in the determination processing of step S37, and the azimuth measurement processing ends. And it returns to step S1 of the main control process of FIG.

  On the other hand, if the crown 110a is pulled out during the loop process of steps S21 to S38, “YES” is determined in the determination process of step S38, and the process proceeds to the north correction process of step S39. A processing control means is configured by the processing in step S38. When the north correction process is completed, the process returns to step S21 again.

[North correction processing]
FIG. 5 is a flowchart of the north correction process executed in step S39 of FIG. 4, and FIG. 6 is an explanatory diagram showing the operation of the pointer in the north correction process.

  The north correction process is a calibration process in which, for example, when the accurate magnetic north direction is known, the azimuth correction value β is set so that the pointer 104 faces the accurate magnetic north direction in the azimuth measurement process. That is, as shown in FIG. 6A, when the pointer 104 is shifted by an angle β with respect to the accurate magnetic north direction in the azimuth measurement process, as shown in FIG. The angle β is corrected and the pointer 104 is calibrated so that it points in the correct magnetic north direction.

  To start the north correction process, as shown in FIG. 6 (a), the user moves the crown 101 horizontally while the direction measurement process is being performed, and the crown is stopped in an arbitrary direction. Pull out 110a. When the north correction process is started by this operation, the driving control of the pointer 104 based on the azimuth measurement results of the azimuth sensor 53 and the azimuth detector 54 is temporarily stopped. Then, when shifting to the north correction process, first, the CPU of the control circuit 45 executes a loop process for confirming whether or not the rotation operation signal of the crown switch 110 is input and whether or not the crown 110a is pushed back (steps S41 to S41). S43). As a result, if there is no signal input or operation, this loop processing (steps S41 to S43) is repeated.

  In this state, the user rotates the crown 110a to correct the deviation angle β of the azimuth. When the crown 110a is rotated, the pointer 104 is rotated by a predetermined angle for every rotation of the predetermined angle, so that the user rotates the crown 110a until the pointer 104 faces the magnetic north direction. Each time the pointer 104 rotates, the value of the azimuth correction value β stored in the azimuth correction value storage unit 47a of the RAM 47 is also updated by the same amount as the rotation angle of the pointer 104.

  That is, during the loop processing of steps S41 to S43, when a rotation operation signal indicating that the crown 110a has been rotated clockwise by a predetermined angle is input, the CPU of the control circuit 45 performs “ If “YES” is determined, the process proceeds to step S44.

  Also, during the loop processing of steps S41 to S43, even when a rotation operation signal indicating that the crown 110a has been rotated counterclockwise by a predetermined angle is input, the CPU of the control circuit 45 performs “YES” in the determination processing of step S42. ", And the process proceeds to step S49.

  When the process proceeds to step S44, the CPU of the control circuit 45 first updates the value of the azimuth correction value β stored in the azimuth correction value storage unit of the RAM 47 by “+ 6 °” (step S44). Subsequently, one forward drive pulse is output to the second hand drive unit 41 (step S45), and the second hand position counter is updated by "+1" (step S46). When the counter value is updated, it is checked whether the value of the second hand position counter has reached the value “60” that returns to the original position once (step S47). If it is not “60”, it is “60”. If so, the needle position counter is updated to “0” (step S48), and the process returns to the loop process of steps S41 to S43.

  On the other hand, after proceeding to step S49, the CPU of the control circuit 45 first updates the value of the azimuth correction value β stored in the azimuth correction value storage unit of the RAM 47 by “−6 °” (step S49). Subsequently, a drive pulse for reverse rotation is output to the second hand drive unit 41 once (step S50), and the second hand position counter is updated by "-1" (step S51). After updating the counter value, it is confirmed whether the value of the second hand position counter has become a value “−1” that needs to be raised (step S52). If it is not “−1”, it is “−1” as it is. After updating the needle position counter to “59” (step S53), the process returns to the loop process of steps S41 to S43.

  The correction angle changing means is configured by the processing of these steps S41, S42, S44 to S53, and the pointer 104 rotates by a predetermined angle (± 6 °) each time the user rotates the crown 110a by a certain angle. Further, the value of the azimuth correction value β is updated by a predetermined angle (± 6 °).

  Then, as shown in FIG. 6B, since the calibration operation is completed when the pointer 104 is directed in the correct magnetic north direction, the user pushes back the crown 110a and ends the north correction process. That is, during the loop processing of steps S41 to S43, the operation of pushing back the crown 110a is performed, so that the CPU of the control circuit 45 determines “YES” in the determination processing of step S43, thereby completing the north correction processing. To do. A processing control unit is configured by the processing in step S43.

  When the north correction process is completed, the angle β by which the pointer 104 is rotated is stored in the azimuth correction value storage unit 47a of the RAM 47. Therefore, in the subsequent azimuth measurement process, the azimuth correction is performed with respect to the measured magnetic north direction. Correction for shifting the angle of the value β is performed (step S23 in FIG. 4), and the pointer 104 is controlled to point to the correct magnetic north direction.

  As described above, according to the electronic azimuth meter 100 of this embodiment, by operating the crown switch 110 in the north correction process, the pointer 104 indicating the azimuth rotates by a predetermined angle, and the rotation of the pointer 104 The angle is reflected in the azimuth correction value β of the azimuth correction value storage unit 47a. Therefore, the user can intuitively and easily determine what correction is performed and how much angle is corrected in the subsequent azimuth measurement process by rotating the pointer 104 in the north correction process. Can be recognized.

  In addition, since it is possible to recognize how much angle is corrected, it is possible to recognize the amount of deviation in azimuth measurement for each location by performing this north correction processing operation for each different location.

  Further, according to the electronic azimuth meter 100 of this embodiment, the azimuth measurement by the azimuth sensor 53 and the azimuth detection unit 54 becomes unnecessary (the azimuth measurement result is not used) during the north correction process. It is possible to relax the restriction that accurate calibration processing cannot be performed unless the electronic azimuth meter 100 is completely stationary as in the north azimuth correction processing. In other words, in this embodiment, since the direction measurement process is not required in the north correction process, accurate calibration is possible even if the electronic direction meter 100 is moved a little if the direction of the electronic direction meter 100 is not changed. Processing is possible, and an effect that the operation of the north correction processing becomes easier as compared with the case of the conventional north direction correction is obtained.

  Further, according to the electronic azimuth meter 100 of the present embodiment, the north correction process is started by pulling out the crown 110a, and the position of the pointer 104 in the north correction process is changed by rotating the crown 110a. Since the north correction process is completed by pushing back the crown 110a, the north correction process can be performed by a simple operation while the electronic azimuth meter 100 is fitted on the arm.

The present invention is not limited to the above embodiment, and various modifications can be made.
For example, in the above-described embodiment, as the azimuth display means for pointing and displaying the azimuth, the configuration indicating the azimuth by the pointer 104 is shown. For example, as shown in the plan view of the other electronic azimuth meter 100A in FIG. It is also possible to adopt a mode in which the direction is indicated by dot display or segment display.

  In the example of FIG. 7, a circumferential band-shaped azimuth indicator 112 is provided on the outer peripheral portion of the display unit 111, and an arbitrary angle portion of the azimuth indicator 112 can be highlighted to indicate an arbitrary direction. Has been made possible. In the example of FIG. 10, the north azimuth is indicated by a portion N <b> 1 in which a series of three segments in the azimuth indicator 112 is highlighted. Further, the display unit 111 displays an azimuth display N2 in which the azimuth angle in the measurement direction is represented by a number, and an azimuth display N3 in which the azimuth angle in the measurement direction is represented by a symbol of east, west, south, and north (WESN). In addition, a mode in which an arrow is displayed on the display unit by dot display or the like to indicate the direction may be employed.

  Further, in the electronic azimuth meter 100 of the above embodiment, the configuration in which the operation of the north correction process is performed by the crown switch 110 is shown. For example, when the operation buttons b1 and b3 in FIG. The indicated direction may be changed by a predetermined angle.

  In the above-described embodiment, the north correction process has been described as a process for directing the pointer 104 toward the correct magnetic north. For example, when the correct true north is known, the pointer 104 is directed toward the correct true north. It is also possible to apply as a process for this. That is, by performing the setting process by the same operation so that the pointer 104 is directed to the true true north by the north correction process, the azimuth correction is performed so that the pointer 104 indicates the correct true north in the subsequent azimuth measurement process. Is possible. In addition, a function of setting the declination between magnetic north and true north by numerical input or the like is added, and the azimuth correction value of the azimuth correction value storage unit 47a is added to the magnetic north azimuth measured by the azimuth sensor 53 and the azimuth detection unit 54. It is also possible to add the set declination angle to obtain the true north direction, and to indicate the true north direction by the pointer 104.

  In the above-described embodiment, the configuration in which the rotation control of the pointer 104 based on the azimuth measurement is interrupted during the north correction process is shown, but this configuration can also be changed. That is, even during the north correction process, the direction measurement is performed to continue the rotation control of the pointer 104 toward a specific direction, and every time the crown 110a is rotated, the direction of the direction correction value storage unit 47a Rotation control is performed in which the correction value is changed by a predetermined angle, and the pointer 104 is pointed to the predetermined direction while reflecting the change in the direction correction value. With such a configuration, even if the orientation of the electronic azimuth meter 100 is changed during the north correction process, the pointer 104 is not affected by the change in the orientation, and the pointer 104 is set to the orientation correction value in the measured magnetic north. Thus, the user can continue the north correction process depending on the position of the pointer 104. In addition, the details shown in the embodiments can be appropriately changed without departing from the spirit of the invention.

41 Second hand drive unit 45 Control circuit 46 ROM
47 RAM
47a Direction correction value storage unit 51 Operation unit 53 Direction sensor 54 Direction detection unit 100 Electronic azimuth meter 101 Dial 104 Pointer 108 Operation button 110 Crown switch 110a Crown 100A Electronic azimuth meter 112 Direction indicator

Claims (5)

Geomagnetism detecting means for detecting the direction of geomagnetism,
Correction value storage means for storing the correction value of the azimuth display;
Azimuth calculating means for obtaining a specific azimuth by correcting the detection result of the geomagnetism detecting means based on the correction value;
A direction indicator that indicates a specific direction obtained by the direction calculation means, comprising a pointer provided in a rotatable manner or a plurality of circumferentially arranged display bodies;
In an electronic compass with
Switch means that can be operated from the outside;
A correction angle changing means for changing the direction indicated by the azimuth display means by a predetermined angle based on an operation of the switch means and changing a correction value stored in the correction value storage means in response to the change; ,
An electronic azimuth meter comprising: The switch means is a crown switch that generates a rotation operation signal every time the crown is rotated by a predetermined angle.
The correction angle changing means changes the direction indicated by the azimuth display means by a predetermined angle each time a rotation operation signal is generated from the crown switch, and changes the correction value stored in the correction value storage means. The electronic azimuth meter according to claim 1, wherein the electronic azimuth meter is changed by a value corresponding to the predetermined angle. The crown switch is configured to electrically distinguish between a state in which the crown is pulled out and a state in which the crown is pushed back.
Further, when it is determined that the crown has been pulled out, a correction angle changing process for changing the indication direction of the azimuth display means by the correction angle changing means and the correction value of the correction value storage means according to an operation 3. The electronic azimuth meter according to claim 2, further comprising processing control means for executing and ending the correction angle changing process by the correction angle changing means when it is determined that the crown is pushed back. The processing control means includes
When it is determined that the crown has been pulled out, while stopping the process of pointing a specific direction by the direction display means based on the detection result of the geomagnetic detection means,
4. The electronic apparatus according to claim 3, wherein when it is determined that the crown is pushed back, the process of pointing a specific direction by the direction display unit is resumed based on the detection result of the geomagnetism detection unit. Compass. The bearing calculation means
2. The electronic azimuth meter according to claim 1, wherein a direction obtained by adding an angle represented by the correction value to a direction of geomagnetism as a detection result of the geomagnetism detecting means is obtained as the specific direction.

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