TW200424545A - Azimuth measuring method and apparatus, and recording medium having stored the azimuth measuring method - Google Patents

Abstract

In an azimuth measuring apparatus, a pair of independent magnetic field sensors (X) and (Y) are arranged such that their magnetism sensing directions intersect at an angle in a range of 90 through less than 180 degrees. A bias coil (C) is disposed so as to apply magnetic fields having the same magnitude to the respective two magnetic field sensors (X) and (Y) in their axial directions. The azimuth is calculated based on the angle at which the magnetism sensing directions of the two magnetic field sensors (X) and (Y) intersects, the magnetic fields sensed by the two magnetic field sensors (X) and (Y), and the magnetic field applied by the bias coil (C).

Description

200424545 (1) Description of the invention: (1) Technical field to which the invention belongs The present invention relates to a bearing measuring device, a bearing measuring method and a recording medium. (2) Prior art In recent years, electronic devices having an azimuth sensor that measures the azimuth based on the direction of the geomagnetism have become widespread. The azimuth sensor in such an electronic device is generally two rod-shaped magnetic sensors (magnetic field detection elements) with magnetic field sensitivity in one direction, and a vertically arranged module is installed. According to the magnetic sensors The azimuth is measured by the detected magnetic force in two directions. Further, in such an orientation sensor, a method is known in which a bias coil is disposed above the magnetic sensor and a bias magnetic field is applied to detect the geomagnetism in the state of the magnetic sensor. The bias magnetic field is applied to alleviate the hysteresis effect on the measured magnetic sensor, in order to detect the direction or magnitude of the geomagnetism correctly. However, in the above-mentioned prior orientation sensors, two magnetic sensors were arranged in a vertical module in advance, and they were already installed in an electronic device at the time of shipment from the factory. Two magnetic sensors are in the module state, and often there is a problem that the position cannot be measured with certainty. In order to avoid this problem, there is a so-called operation problem that requires adjustment of the magnetic sensor configuration in the module when it is shipped from the factory. Furthermore, since the two magnetic sensors are arranged perpendicular to each other, there is a problem that the mounting efficiency of the magnetic sensor is not good. (3) Summary of the Invention Therefore, in the present invention, in an electronic device provided with an orientation sensor (azimuth measuring device), two magnetic sensors that are independent of each other are used to form a magnetic field detection angle. Above 180 degrees or less, or above 0 degrees. According to this, the degree of freedom of configuration of the magnetic sensor can be improved. In addition, the orientation of the magnetic sensor is calculated to determine the orientation, and it becomes detectable. (4) Embodiments Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. This embodiment is a description of the condition of the radio-controlled timepiece to which the present invention is applied to a wristband type. The application of the present invention is not limited to this embodiment. First, the structure of this embodiment will be described. FIG. 1 is a view of a radio-controlled timepiece 100 according to an embodiment of the present invention. Fig. 2 is a cross-sectional view of part II-II of Fig. 1. As shown in the second figure, the radio-controlled timepiece 100 includes a timepiece case 2 that houses the timepiece module 1 as a case inside, and a watch glass 3 is mounted on the center of the upper part of the timepiece case 2 through a gasket. The frame-shaped member 5 included in the timepiece module 1 is connected to the timepiece glass 3 at its upper portion. Furthermore, a back cover 6 is mounted under the watch module 2 by a waterproof ring 7, and a buffer member 8 is provided between the cover 6 of the watch module 1. An outer cover 9 is provided on the outer periphery of the upper part of the timepiece case 2. The watch case 2 is attached with a watch band 24 via a belt shaft 2A. The clock module 1 has an analog function. As shown in Fig. 2, the timepiece mold is provided with an upper case 10 and a lower case 11 as intermediate members. A dial 12 is disposed on the upper case 10, and a shape member 5 is disposed on the dial 12 of the dial. Further below the frame-like member 5, a substrate 13 serving as an electronic substrate is arranged between a predetermined upper case 10 and a lower case 11. The clock module 1 is to be fitted with these dials 1 2. The upper part corresponds to the • position. It is applied, but the outer plan is shown in the plan view, and the outer 4 groups are placed on the surface and the back. In group 1, there are framed circuit cases 10-6-200424545, circuit board 1 3, and lower case 1 1 on the watch case 2. Frame 4 structure. In addition, the upper case 10 is provided with an analog pointer mechanism 15 and the lower case 11, for example, a battery (not shown) for the analog pointer mechanism 15 and the like is assembled. The upper case 10 has an antenna 30. The antenna 30 is wound around a part of the magnetic body 31 which is magnetized by an electric wave, and has a conductor 34 which flows a current in accordance with the magnitude of the magnetic field generated by the magnetic body 31. The magnetic body 31 has an antenna body portion 3 3 formed by a radio wave capturing portion 3 2 that captures time information radio waves. The magnetic wave capturing portion 32 is formed independently and a conductor 34 is wound. The radio wave capturing portion 32 is made of ferrous iron or the like, and is bent along the upper shell 10 into a band shape and is arranged on the upper shell 10. The radio wave capturing section 32 is provided at a position where the antenna main body section 33 is opposed to each other, for example, at 3 o'clock and 9 o'clock, and the radio wave capturing section 32 and the antenna body are connected to each end of the antenna main body section 33. Department 3 3. The antenna body portion 33 is provided so as to be connectable to the radio wave capturing portion 32, and both end portions thereof are supported by the upper case 10 where the radio wave capturing portion 32 is arranged. In the antenna body portion 33, a conductor 34 such as a copper wire is wound in a coil shape. The antenna body portion 33 is magnetized by radio waves, and a current having a magnitude of a magnetic field generated in the magnetized antenna body portion 33 flows through the conductor 34. In addition, corresponding to the 6 o'clock o'clock position of the upper case 10, an orientation sensor 1 1 2 is provided. The azimuth sensor 1 1 2 is composed of two rod-shaped magnetic field detection elements (magnetic sensor) X, Y, and a bias coil C. The magnetic field detection element X and the magnetic field detection element Y are arranged on the circuit board 13 with the straight lines Lx and Ly corresponding to the respective magnetic detection directions at a predetermined angle Φ. The specific system is arranged such that the angle Φ crossing the magnetic detection direction is π / 2 or more and 7Γ or less, and the direction of the bisected angle φ / 2 -7- 200424545 is the direction of 12 points. (Alternatively, the angle at which the magnetic detection direction intersects Φ is greater than Οττ / 2, and the direction of the bisecting angle φ / 2 is 12 o'clock.) Near the azimuth sensor 1 1 2, you must avoid disposing it easily. Magnetic field affected parts.尙 Azimuth sensor 11 2 is attached to a radio-controlled timepiece 100 when it is shipped from the factory. As shown in FIG. 2, the bias coil C is wound around a part of the L-shaped core (see FIG. 1) in a direction perpendicular to the bisecting angle φ / 2 direction, and one end of the core is fixed on the circuit board 13. . Alas, the magnetic field detection element used in the orientation sensor 1 12 has the same driving method, as long as it is an element with magnetic field sensitivity in one direction (MR element, MI element, etc.), it can also be a different magnetic field. Manufacturers of detection element X and magnetic field detection element Υ. The analog pointer mechanism 15 includes a pointer shaft 17 extending from a shaft hole 1 2 a provided on the dial 12 and a pointer 18 such as an hour hand and a minute hand mounted on the pointer shaft 17. 1 8 Turn the needle over the dial 12. Here, the dial 12 and the pointer 18 are provided at predetermined positions, and a light-emitting portion 19 is provided which receives light and emits light from the light-emitting elements, respectively. The frame-like member 5 is made of, for example, a light-transmitting synthetic resin, particularly a transparent synthetic resin. As shown in FIG. 2, this frame-shaped member 5 is assembled on the inner periphery of the watch case 2 in a state of being attached to the peripheral edge 邰 of the clock recording glass 3 and the upper surface of the dial 12 (upper case 10). surface. In addition, in a predetermined place of the frame-like member 5, for example, in the places corresponding to 2 o'clock and 6 o'clock shown in FIG. 1, an ultraviolet light emitting element 21 of invisible light is arranged. The frame-shaped member 5 in which the ultraviolet light-emitting element 2 01 is arranged is a member that also serves as a protective member or a buffer member. The ultraviolet light-emitting element 201 is, for example, an ultraviolet light or an ultraviolet light-emitting diode (LED) having a wavelength of 254 to 420 nm (nm), or a wavelength of 3 74 to 3 89 nm, or an ultraviolet light near 3 6 5 nm. ) And so on. Also, as shown in FIG. 2, the ultraviolet light emitting element 2 01 is provided with a contact member 21 that is connected to the ultraviolet light emitting element 2 01 and a coil spring that can be used as an energizing member is provided to the contact member 21. The connecting member 21a constituted by 22 is supported and fixed. This contact member 2 1 ′ has a pair of supporting shafts 21a corresponding to the electric terminal (not shown) of the ultraviolet light-emitting element 20, and the supporting shaft 21a is abutted on the electric terminal. The contact member 21 is electrically conductive, and a central portion thereof is inserted into a bud through hole 10a provided in the upper case j 0, and at the same time passes through a through hole i2b provided in the dial 12 and a through hole 5a provided in the frame member 5, The upper end portion of the frame-like member 5 is arranged to protrude upward. The ultraviolet light emitting element 20 is attached to the protruding upper end portion (a pair of supporting shafts 2la). A buffer member 23 is mounted between the ultraviolet light emitting element 201 and the timepiece glass 3. The helical spring spring 22 is electrically conductive, and is inserted into the through-hole i 0a provided in the upper case. The lower end portion thereof elastically contacts the connection terminal τ formed by the circuit board 13. The upper bridging portion is in contact with the contact member. 2} lower end. In accordance with this, the spiral bow early spring 22 energizes the contact structure # 21 to the ultraviolet light emitting element 20 side, and the bow is supported early. Furthermore, a connection member 2 1 A composed of a contact member 22 and a coil spring 22, an electric ultraviolet light emitting element 2 0, and a circuit board 3. As shown in FIG. 2, the light-emitting portion 19 is formed at a predetermined place on the dial i 2, for example, it is formed as a resin portion, a printing portion or a coating portion, on a mark portion or a time character on the winter 200424545 surface, or on an analog pointer mechanism 1 5 Pointer 18 places required. The light-emitting portion 19 is preferably covered and protected with an overcoat layer (not shown). These light-emitting portions 19 'are, for example, colored ultraviolet light having a reaction wavelength of 350 to 420 nm, or 254 to 365 nm, and are transparent when they are not irradiated with ultraviolet light. In other words, the ultraviolet light emitted from the ultraviolet light emitting element 201 or the ultraviolet light emitted from the frame-like member 5 having a light transmissive reaction reacts, and the light emitting portion emits colored light.

In FIG. 1, the rod-shaped magnetic field detection element X and the magnetic field detection element Y are arranged close to the corresponding six points. However, as a modification of FIG. 3, for example, as shown in the radio-controlled timepiece 200, it is also possible to separately Each of the rod-shaped magnetic field detection elements may be arranged away from the straight lines Lx and Ly corresponding to the magnetic detection direction. The magnetic field detection element X is arranged at 3 to 5 o'clock on the corresponding circuit board 13 (refer to FIG. 4), and the magnetic field detection element Y is arranged at 7 to 9 o'clock on the corresponding circuit board 13.

As shown in FIG. 3, when the magnetic field detection element X and the magnetic field detection element Y are disposed away from each other, a bias coil Cx is disposed above the magnetic field detection element X in the direction of the magnetic detection direction of the vertical magnetic field detection element X. Above, a bias coil Cy is arranged in the direction of the magnetic detection direction of the vertical parallel magnetic field detection element Y. The coils wound around the bias coils C X and C y are made of the same material, and the number of windings is also the same. The magnetic field detection element X is disposed at 3 to 5 o'clock on the corresponding circuit board 13 (see FIG. 4), and the magnetic field detection element Y is disposed at 7 o'clock to 9 o'clock on the corresponding circuit board 13. The bias coils Cx and Cy have the same structure and are wound around a part of an L-shaped magnetic core. One end of the magnetic core is fixed to the circuit board 13. -10- 200424545 Bias coils Cx and Cy are respectively arranged above the magnetic field detection element X and the magnetic field detection element Y. In Fig. 1, the angle at which the magnetic detection direction of each magnetic field detection element intersects is 7 Γ / 2 or more and 7 Γ or less (refer to Fig. 5A), but when φ is greater than 0 and less than 71/2 (refer to Fig. 5B). ) Can also be applied to the present invention. In addition, Figs. 1 to 4 show the state in which the bias coils C; Cx and Cy are arranged in order to apply the same bias magnetic field to the magnetic field detection element, but permanent magnets may be arranged instead of the bias coils.

< Functional configuration of radio-controlled timepiece >

Next, the functional configuration of the radio-controlled timepiece 100 will be described with reference to Figs. 6 and 7. Fig. 6 is a block diagram showing an example of a circuit configuration of a radio-controlled timepiece 100 according to this embodiment. The radio-controlled timepiece 1 00 is provided with a control unit 1 01; an input unit 102; a display unit 103; a RAM (R and Oni Access Memory) 104; a ROM (Read Only Memory) 105; The reception control unit 106 is composed of a time code conversion unit 107, a timing circuit unit 108, an oscillation circuit unit 109, and an orientation sensor 1110, except that each unit of the oscillation circuit unit 1009 is converged. Connection. The timing circuit section 108 is connected to the oscillation circuit section 109. The control section 101 is provided with a CPU (Central Processing Unit), reads out various programs stored in the ROM 105, and expands them into the RAM 104, and centrally controls each section of the radio-controlled timepiece 100 according to the programs. Hereinafter, various control operations by the control unit 101 will be described in detail. The control unit 101 includes an azimuth calculation unit 1 〇1 a, and calculates a geomagnetic direction (north) from a data input from the azimuth sensor 1 1 〇 with respect to a predetermined coordinate axis (a detection direction of a magnetic field detection element X and an X-axis described later). Direction). In addition, the control unit-11- 200424545 1 ο l determines whether the north direction is consistent with the 12 o'clock direction based on the calculation result of the bearing calculation unit 1 〇1 a. When it is determined that the north direction is consistent with the 12 o'clock direction, the light is turned on. Backlight of display section 03 (see Figure 11). In addition, the control unit 101 performs a standard radio wave reception process immediately after the azimuth measurement and controls the reception control unit 10 every predetermined time. Based on the standard time code input from the time code conversion unit 107, the time is corrected. The current time data of the circuit section 丨 〇8. < Method for calculating angle of geomagnetic direction > Fig. 8 is a graph showing the relationship between the geomagnetic field 二维 on a two-dimensional plane and the magnetic detection directions of the magnetic field detection elements X and Υ. These two kinds of planes are parallel to the dial surface of the timepiece case 2, and are fixed to the plane of the radio-controlled timepiece 100. In the following, a straight line of the magnetic detection directions X and y by the magnetic field detection element X and a straight line crossing the magnetic detection direction by the magnetic field detection element Y is Φ. The magnetic detection direction by the magnetic field detection element X is the X axis, and the magnetic detection direction by the magnetic field detection element γ is the y axis. In this embodiment, as shown in FIG. 8, the direction of the detection of the geomagnetic Η is only inclined by 0 radians from the X axis in the counterclockwise direction, and the positive area of the X axis is regarded as the rotation angle 0 of the counterclockwise direction of 0 radians as the geomagnetic field. The direction of Η. The size of the geomagnetic field is H s. The X-axis component Η X (hereinafter referred to as the “X component”) and the Hy component in the y-axis direction (hereinafter referred to as the “y component”) according to FIG. 8 are as follows: (1) and (2) )formula. [Formula 1]

Hx = Hsxcos θ (1)

Hy = Hsxcos (())-0) (2) -12- 200424545 Detects the angle 0 of the geomagnetic radon. Calculate from the formulas (1) and (2), for example, using the Zijia law) = cos + cos0 + sin # sin0 、 H y / Η x = cos φ + si η φ ta η 0, so the angle of the geomagnetic Η is detected (9 rounds 矣, which becomes the formula (3). [Formula 2] 0 = arctani-^-^ l ( 3)

[Hx sin φ sin φ J, since sin (|) = cos ((|) -7r / 2), cos (|) = -sin ((j) -7r / 2), (3) is interchangeable It is written as the following (4) Formula [Formula 3] Θ = arcta η

Hy cos x Hx L 2 ″ + tan φ — (4) When the same bias magnetic field is applied to the magnetic field detection element X and the magnetic field detection element γ, as shown in FIGS. 9A and 9B, the magnetic field detection element X and the magnetic field are detected. In each of the magnetic detection directions of the element Y, a bias magnetic field Vi induced by the bias coil C is applied in a direction in which the crossing angle φ is equal to two equal angles φ / 2. FIG. 9A shows a situation where φ is greater than τΓ / 2 and less than π, and FIG. 9B shows a situation where φ is greater than 0 and 7Γ / 2. Fig. 10 shows the relationship between the direction in which the bias magnetic field V i is applied and the magnetic detection direction. When the magnitude of the bias magnetic field V 丨 is B ', the χ component B X and the y component B y of the bias magnetic field V i become the same as in Equation (5). [Formula 4]

B c o s — 2 -13- 200424545 Conversely, the amount of bias magnetic field required by each magnetic field detection element is ^ =

Bx = By), the β of the magnitude of the magnetic field to be applied becomes as follows: (6) Equation [Eq. 5] (6) β sec — 2 The magnetic field actually detected by the magnetic field detection element X is due to the cost of geomagnetism X Η The sum of X and the X component of the bias magnetic field / 3, so since the magnitude of the bias magnetic field is subtracted from the detected magnetic field / 5 'to calculate the χ component of the geomagnetism Η ° ° The magnetic field actually detected by the magnetic field detection element γ is The sum of the y component Hy of the geomagnetic field and the y component stone of the bias magnetic field, because the magnitude yS of the bias magnetic field is subtracted from the detected magnetic field, the y component H y of the geomagnetic field is calculated. Return to the input part 1 2 of FIG. 6 in order to The radio-controlled timepiece 100 is configured with buttons such as an azimuth measuring button 102a (refer to FIG. 1) for performing various functions, and an operation signal for pressing these buttons is output to the control unit 101. Bearing measurement button 1 〇 2a is a button for instructing the start of bearing measurement. The display unit 103 includes a display unit 103a, a dial 12, a backlight unit 103b, and the like. The display unit 10 3 a is constituted by a display device such as a small liquid crystal display. With the display signal input from the control unit 101, the desired display processing is performed. The backlight unit 103b is composed of an LED (Light Emitting Diode) or the like, and is arranged on the back of the display unit 103a or the dial 12. The backlight unit 103b is irradiated with light on the display unit 103a or the dial 12 in accordance with a control signal input from the control unit 101. RAM 1 04 'The various programs executed by the control section 101 are extended to the program storage area, and at the same time, data such as input instructions, input data, and processing results generated by the programs described above are temporarily stored in the work. Book-1 '200424545 Memory. R Ο Μ 1 5 is a system program or application program for controlling radio-controlled timepieces 1 00 and data used in the execution of such programs. For example, ROM 1 〇5 ′ is used to store an azimuth measurement processing program for performing azimuth measurement (refer to FIG. 11). The receiving control unit 106 cuts the frequency components that are not needed for the long-wave standard radio wave received by the antenna, takes out the applicable frequency signal, and converts it to the corresponding frequency signal and outputs it. The timing circuit section 108 counts signals input from the oscillation circuit section 109, and obtains current time data and the like. Then the current time data is output to the control unit 101. The oscillating circuit section 109 is a circuit that always outputs a certain frequency signal. The time code conversion unit 107 generates a standard time code including data necessary for clock functions such as a standard time code, an accumulated day code, and a week code based on a signal output from the reception control unit 106, and outputs the standard time code to the control unit 10. 1. As shown in FIG. 7, the orientation sensor unit 1 10 is composed of a drive circuit 1 1 1 ′, an orientation sensor 1 1 2, an amplifier unit 1 1 3, an A / D conversion circuit 1 1 4, and the like. The driving circuit η 1 drives the azimuth sensor 1 12 in accordance with a control signal input from the control section 101. As shown in Figs. 9A and 9B, the orientation sensor 1 1 2 is composed of two magnetic field detection elements X and Y and a bias coil C. The magnetic field detection element X detects the difference between the components of the magnetic field X, and outputs the detection result as an analog azimuth signal to the amplifier 1 1 3. The magnetic field detection element Y detects a component of the magnetic field y, and outputs the detection result as an azimuth signal to the amplifying section 1 1 3. -15- 200424545 The amplifying section 1 1 3 amplifies the analog azimuth signal input from the azimuth sensor 1 1 2 and outputs it to the A / D conversion circuit 1 14. The A / D conversion circuit 114 digitally converts the azimuth signal input from the amplifying section 113 and outputs it to the azimuth calculating section 1 0 1 a. Next, the operation in this embodiment will be described. Referring to the flowchart in FIG. 11, the azimuth measurement processing performed in the radio-controlled timepiece 100 will be described. Since the orientation measurement button 102a is pressed, the orientation sensor 1 1 1 is driven by the drive circuit 1 1 1 when the orientation measurement is instructed (step S 1; Yes), because a current flows in the bias coil C, a bias magnetic field is applied to the magnetic field. The detection elements X, Y are detected (step S 2). Next, the X component of the magnetic field is detected by the magnetic field detection element X (step S3), and the y component of the magnetic field is detected by the magnetic field detection element Y (step s4). Next, in the azimuth calculation unit 10a, the X component Hx of the geomagnetism is calculated by subtracting the bias magnetic field / 3 from the X component of the detection magnetic field, and the y of the geomagnetic field is calculated by subtracting the bias magnetic field / 3 from the y component of the detection magnetic field. Ingredient Hy. Then, since the X component Hx and the y component Hy of the geomagnetism are substituted into the right expression of the formula (4), the direction of the geomagnetism, that is, the angle 0 in the north direction is calculated (step S5). After the angle Θ in the north direction is calculated, it is determined whether the angle Θ is equal to the predetermined value 値 (step S6). Here, the so-called regulation 値 means that the angle with respect to the 12 o'clock direction of the X axis is Φ / 2. When step S6 is not 0 = φ / 2 (step S6; No), the process returns to step S3. The user equipped with the radio-controlled timepiece 100 has to change the direction of the wrist or body, and change the direction of the radio-controlled timepiece 100. The control unit 100 responds to the direction of the radio-controlled timepiece 100 repeatedly from step S3 to step S6. Its processing. When step S6 becomes (9 = φ / 2, the 12 o'clock direction coincides with the north direction (step 200424545 S6; YES), the application of the bias magnetic field is ended (step S 7), and the backlight portion is turned on (step S 8). The reception control unit 106 receives the time information (step S 9), corrects the current time based on the received time information (step S 10), and ends the measurement process. In this way, the time information is received to correct the current time after the bearing measurement, and The bias magnetic field during the azimuth measurement may affect the timepiece circuit part, which may cause an error in the time. Therefore, the flow in Figure 11 is to make the azimuth meter to display a more accurate time after the azimuth measurement. It is also possible to receive time information. In addition, when the two-point direction in the flowchart in FIG. 11 is consistent with the north direction, the backlighting unit 103b is used for reporting, but the reporting method is not limited to this. As described above, according to the radio-controlled timepiece 100 according to this embodiment, the magnetic field detection elements X and γ which are mutually independent are arranged so that they can be arranged in mutually different detection directions to a free direction, especially When installed in small electronics, it can increase the freedom of arrangement and improve the efficiency of the magnetic field detection element. As the calculation is based on the configuration of the magnetic field detection element, the orientation can be detected correctly, and it becomes unnecessary to implement the magnetic field detection element previously implemented. Moreover, the angle Φ crossing the magnetic field detection element X and the magnetic field detection element Y in the direction of the detected magnetic field is 7Γ 72 or more or 7Γ / 2, so it is compared with the case where the fixed Φ is 7Γ / 2 as before. It can improve the installation freedom of the product, and also improve the installation efficiency of the magnetic field detection element. 103b After the root orientation is measured, it is due to the installation position of the single magnetic machine. In step S3 to step S6, the angle φ / 2 in the 12-point direction is specified. The orientation is determined based on whether the calculated angle Θ in the north direction is equal to the angle φ / 2 in the 12-point direction. Calculate the magnitude H s of the geomagnetic field η with the angle β of the angle β. Set the orientation of the geomagnetic field η where the magnitude H s of the geomagnetic field is the largest, and set the north direction as the output. Yes. To find the magnitude H s of the geomagnetic ，, for example, the angle $ and the X component 及 X of the geomagnetism calculated above can be substituted into the formula (1). That is, the magnitude of the geomagnetic η according to the formula (丨) becomes Hs. = Hxxsec < 9. Also, since the measurement results of the azimuth are reported by lighting back light or sound, it is not necessary to newly set a special method for reporting the measurement results, and the manufacturing cost of the radio-controlled timepiece 100 can be suppressed. ≪ Deformation Example > The flowchart shown in FIG. 11 shows the situation reported when the 12 o'clock direction is consistent with the north direction, but the following shows the action when the position shown in the 12 o'clock direction is notified. An example of this operation will be described with reference to the flowchart in FIG. 12 and the bearing measurement processing ② performed by the radio-controlled timepiece 1000. Since the azimuth measurement button 1 〇 2a is pressed, the azimuth measurement is instructed (step S 丨 丨; yes) when the azimuth sensor 1 1 2 is driven by the drive circuit 1 1. As a current flows through the bias coil C, a bias magnetic field is applied to the magnetic field. Detection elements X, γ (step s) Next, the x component of the magnetic field is detected by the magnetic field detection element X (step S 1 3), and the y component of the magnetic field is detected by the magnetic field detection element Y (step S 1 4), and then the azimuth calculation is performed The unit 1 〇1 a calculates the angle 0 〇 in the north direction based on the magnetic fields detected in steps S 1 3 and s 1 4 (step S 1 5). If the angle 0 〇 in the north direction is calculated, it is determined whether the angle 0 〇 Equal to Regulation-18- 200424545 値 / 2/2 (step S16). When step S16 is not 0 〇 = φ / 2 (step si6 • 'No') return to step S 1 3. Use of a radio-controlled timepiece 1 〇〇 In other words, the direction of the radio-controlled timepiece 100 is changed by changing the direction of the wrist or body, and the control section 101 repeats the processing from step S13 to step S16 in response to the direction of the radio-controlled timepiece 100. In step S16 Becomes 0 〇 = φ / 2, when the 12 o'clock direction is consistent with the north direction as shown in FIG. 13A (step Step S16; Yes), the backlight unit 103b is turned on (step S17). For example, 'At this time, when the observer's body is north, change the direction for the purpose and proceed with the next step. The backlight unit 10 After lighting in 3b, the position measurement is instructed by pressing the position measurement button 1202a 'again (step S 1 8; Yes), and the magnetic field detection element X detects the X component of the magnetic field (step S 1 9), and the magnetic field detection The element γ detects the y component of the magnetic field (step S20). Next, the azimuth calculation unit 101a calculates the angle 0 i in the north direction based on the magnetic fields detected in steps S 18 and S 19 (step S 2 1). After calculating the angle Θ i in the north direction, the application of the bias magnetic field is completed (step S 22). 'The angle 0 G (0 α = φ / 2) calculated from step S15 is different from the 0 1 calculated from step S 2. 0 0 !, Calculate the azimuth in the 12 o'clock direction (step S23). When the azimuth in the 12 o'clock direction is detected, the detected azimuth is displayed on the display unit 103a to notify (step S24), and the present azimuth measurement process is terminated. For example, as shown in Figure 13B, when 0〇-01 = φ / 2- 0ι = -7τ / 4, the azimuth at 12 o'clock is north. East. As shown in Fig. 13C, when 0 Q-0 1 = φ / ΐ-θ ^ + π / 4, the azimuth in the direction of 12 o'clock becomes northwest. As described above, the azimuth of the observer's direction is observed. -19- 200424545 In step S 2 4, the position in the direction of 12 o'clock is displayed on the display unit 10 3 a for notification, but the notification method is not limited to this. For example, a pointer may be used for notification. According to the azimuth measurement processing shown in Fig. 12, as the azimuth indicating the predetermined position of the radio-controlled timepiece 1000 (azimuth in the direction of 12 o'clock), the azimuth sensor can be notified because it can also notify the azimuth other than the north direction. Convenience. According to the present invention, two independent magnetic sensors can be arranged so that the crossing angle of the magnetic field detection direction is 90 degrees or more and 180 degrees or less, or 90 degrees more than 0 degrees, which can improve the magnetic sensitivity of the arrangement. Degree of freedom of the measuring device. Since the orientation is calculated based on the configuration of the magnetic sensor, the correct orientation can be raised. It should be noted that the content of the description in this embodiment can be changed as appropriate without departing from the spirit of the present invention. (5) Brief Description of Drawings Figure 1 is a schematic plan view of a radio-controlled timepiece 100 according to an embodiment of the present invention. Figure 2 is a cross-sectional view of the π-! 丨 part of Figure 1. FIG. 3 is a plan view of a radio-controlled timepiece 2000 according to a modification of the embodiment of the present invention. Fig. 4 is a sectional view of part iv_IV in Fig. 3. Fig. 5A is a diagram showing an example of an arrangement when the crossing angle of the magnetic field detection element X and the magnetic field detection element Y constituting the azimuth sensor 1 and 2 is 90 degrees or more and 180 degrees or less. Fig. 5B is a diagram showing the arrangement when the crossing angle of the magnetic field detection element X and the magnetic field detection element 构成 constituting the azimuth sensor 1 12 is greater than 0 ° and less than 90 ° -20-200424545. Fig. 6 is a block diagram showing an example of a circuit configuration of a radio-controlled timepiece 100. Fig. 7 is a block diagram showing an example of a circuit configuration of the orientation sensor 1 10 shown in Fig. 6. Fig. 8 is a graph showing the relationship between the geomagnetic field and the magnetic field detection direction. Fig. 9A is a diagram showing an example of the arrangement of the magnetic field detection element X, the magnetic field detection element Υ, and the bias coil C when the angle at which the magnetic field detection element X intersects the magnetic field detection element γ is 90 ° to 180 °. Fig. 9B is a diagram showing an example of the arrangement of the magnetic field detection element X, the magnetic field detection element Υ, and the bias coil C when the angle at which the magnetic field detection element X intersects the magnetic field detection element γ is greater than 0 to 90 degrees. Fig. 10 is a diagram showing the relationship between the direction in which the bias magnetic field B is applied and the direction in which the magnetic field is detected. Fig. 11 is a flowchart showing the azimuth measurement process ① performed by the radio-controlled timepiece 100. Fig. 12 is a flowchart showing a modified example of the present embodiment, and shows the azimuth measurement process ② performed by the radio-controlled timepiece 1000. Figure 13A is the azimuth measurement process in Figure 12 when the 12 o'clock direction coincides with the north direction, showing the relationship between the magnetic field detection direction and the north (geomagnetic direction) and 12 o'clock directions. Figure 1 3B is the azimuth measurement process ② in Figure 12 when the azimuth in the 12 o'clock direction becomes northeast, showing the relationship between the magnetic field detection direction and the north (geomagnetic direction) and 12 o'clock directions. Figure 1 3 C shows the azimuth measurement processing in Figure 12 ②. When the azimuth at 12 o'clock-21-242004545 becomes North West, it shows the relationship between the magnetic field detection direction and the north (geomagnetic direction) and 12 o'clock directions. Illustration. The representative symbols of the main part explain the magnitude of the bias magnetic field B, / 3 Bi bias magnetic field C; Cx, Cy bias coil Η Geomagnetic Ηχ Hy Lx, Ly X, YI θ 0〇, θ 10 1a 102a 1 03 103a 103b 106 1 07 108 110 111 Geomagnetic X-axis direction Geomagnetic y-axis direction y component Magnetic detection direction Magnetic field detection element (Magneto-sensing sensor) Angle where magnetic detection direction intersects Angle detected by geomagnetism Magnetic angle North direction azimuth calculation unit Azimuth measurement button display section Display section Backlight section Reception control section Time code conversion section Timing circuit section Azimuth sensor section drive circuit-22- 200424545 112 Azimuth sensor (azimuth measurement device) 1 1 3 Magnification section 114 A / D Conversion circuit-23-

Claims (1)

200424545 Scope of patent application: 1 · An azimuth measuring device with 2 magnetic sensors, which have magnetic field detection directions that are used to detect magnetic fields and cross each other independently, and are characterized by: Applying means for applying a bias magnetic field to the two magnetic sensors (Fig. 1C); and calculating means for calculating the angle of intersection between the magnetic detection directions of the two magnetic sensors and The detected magnetic field is calculated with the bias magnetic field applied by the bias magnetic field applying means (10la in FIG. 6 and S5 in FIG. 11); the two magnetic sensors are configured as The angle of the magnetic detection directions crossing each other is 90 degrees or more and 180 degrees or less. 2. The azimuth measuring device according to item 1 of the scope of patent application, wherein the bias magnetic field applying means is in the direction of magnetic detection (Lx in FIG. 1) of each of the two magnetic sensors (X, Y in FIG. 1). , Ly), apply the same bias magnetic field. 3. The bearing measuring device according to item 1 of the scope of the patent application, wherein the calculating means is provided with: a judging means (Figure 6 in FIG. 10, S6 in Figure 11), 'determines whether the prescribed place of the bearing measurement device is to North direction; and notification means (103b in FIG. 6 and S8 in FIG. 11). When the determination means determines that the prescribed place of the azimuth measuring device is the north direction, the determination result is reported. 4. As for the azimuth measuring device in the third item of the patent application, where the reporting hand-24 200424545, the result of the judgment is reported by lighting up the display section. 5 · The azimuth measuring device according to item 1 of the scope of the patent application, wherein the calculation means is provided with: The first calculation means (s 1 5 of Fig. 12) 'according to the magnetic detection directions of the two magnetic sensors. Calculate the azimuth angle indicating north with the magnetic field detected by the two magnetic sensors and the bias magnetic field applied by the bias magnetic field applying means; The second calculation means (S 2 1 in Fig. 12) changes the direction of the azimuth measuring device, and then detects the angle detected by the two magnetic sensors based on the angle at which the magnetic detection directions of the two magnetic sensors cross. And the bias magnetic field applied by the bias magnetic field applying means to calculate the direction of north. The third calculating means (S23 in FIG. 12) calculates the angle raised by the first calculating means and the brother 2 The angle calculated by the lifting means calculates the azimuth indicated in a predetermined place of the azimuth measuring device; and the notification means (S24 in FIG. 12) notifies the azimuth calculated by the third calculation means. 6. The azimuth measuring device according to item 5 of the scope of patent application, wherein the notifier φ segment is used to notify the calculation result by displaying the calculation result on a display section (103a of FIG. 1 and FIG. 6). 7. A bearing measurement device, which has two independent magnetic sensor sensors (X, Y, Cx, Cy) for detecting the crossing magnetic detection direction of the magnetic field and independent of each other. The characteristics are: Equipped with: Bias magnetic field applying means (CX, Cy in Fig. 3) 'Apply a bias magnetic field to the two magnetic sensors; and -25- 200424545 calculation means (101a in Fig. 6 and S5 in Fig. 11) (S 2 3 of Fig. 12), according to the angle at which the magnetic detection directions of the two magnetic sensors are crossed, with the magnetic field detected by the two magnetic sensors, and by the bias magnetic field applying means Calculate the azimuth of the bias magnetic field of the two magnetic sensors. The angles at which the magnetic detection directions intersect each other are arranged between 0 ° and 90 °. 8. The azimuth measuring device according to item 7 in the scope of the patent application, wherein the bias magnetic field applying means is used to detect the magnetic detection direction (X in FIG. 3) of each of the two magnetic sensors (Lx in FIG. 3). , Ly) Apply the same bias magnetic field. 9. If the azimuth measurement device of item 7 of the scope of the patent application, the calculation means is provided with = determination means (101 in Fig. 6 and S6 in Fig. 11) to determine whether the prescribed place of the azimuth measurement device is directed North direction; and notification means (103b in FIG. 6 and S8 in FIG. 11), and when the determination means determines that the prescribed place of the azimuth measuring device is a northward direction, the determination result is reported. 10. The azimuth measuring device according to item 9 of the scope of patent application, wherein the notification means is to notify the determination result by lighting up the display section. 1 1. The azimuth measuring device according to item 7 of the scope of the patent application, wherein the calculating means is provided with: a first calculating means (S 1 5 in FIG. 12), which intersects according to the magnetic detection directions of the two magnetic sensors; And the field detected by the two magnetic sensors; and the bias magnetic field applied by the bias magnetic field applying means to calculate the angle representing the north position; -26- 200424545 the second calculating means (the first S 2 1 in Figure 2), change the orientation of the azimuth measuring device, and then according to the angle at which the magnetic detection directions of the two magnetic sensors are crossed, with the magnetic field detected by the two magnetic sensors, and by the bias The bias magnetic field applied by the piezomagnetic field applying means calculates the azimuth angle indicating north; the third calculating means (S23 in FIG. 12) calculates based on the angle calculated by the first calculating means and the second calculating means And the notification means (S24 in FIG. 12) to notify the position calculated by the third calculation means. 1 2 · As for the azimuth measuring device of the item 11 in the scope of patent application, the notification means is to display the calculation result on the display section (103a of Fig. 3 and Fig. 6) to notify the calculation result. 1 3. —A position measurement method, which uses two magnetic sensors with magnetic detection directions to detect magnetic fields that cross each other independently, to determine the position (Figure 1-12), which is characterized by: A step of applying a compressive magnetic field to the two magnetic sensors (C in FIG. 1); a magnetic field detecting step of using the two magnetic sensors to detect the magnetic field in their magnetic detection direction; and according to the The angle at which the magnetic detection directions of the two magnetic sensors intersect, and the magnetic detection direction magnetic field of the two magnetic sensors detected by the magnetic field detection step, and the bias magnetic field applied by the bias magnetic field applying step, calculate the orientation. The calculation steps (101a in FIG. 6 and S5 in FIG. 11), -27- 200424545 The two magnetic sensors are arranged such that the magnetic detection directions intersect each other at an angle of 90 degrees or more and 180 degrees or less. 1 4. A bearing measurement method, which uses two magnetic sensors with magnetic detection directions to independently detect magnetic fields to measure the bearing (X, Y, Cx, Cy in Figure 3), and is characterized by: It is provided with the steps of applying a bias magnetic field to the bias magnetic field of the two magnetic sensors (Cx, Cy in Fig. 3); using the two magnetic sensors to detect the magnetic field of the magnetic field in the magnetic detection direction A detection step; and an angle intersecting the magnetic detection directions of the two magnetic sensors, a magnetic field of the magnetic detection directions of the two magnetic sensors detected by the magnetic field detection step, and the magnetic field applied by the bias magnetic field applying step Steps for calculating the azimuth of the bias magnetic field (101a in FIG. 6, S5 in FIG. 11, and S23 in FIG. 12). The two magnetic sensors are arranged such that the angles at which the magnetic detection directions cross each other are 0 ° or more and 90 ° or less. 1 5. — A computer-readable recording medium is recorded with a program that can perform the following functions on the computer: For magnetic detection directions (Lx, Ly in Figure 1) that have an angle of 90 degrees to 180 degrees below Two independent magnetic sensors (X, Y in Figure 1), a bias magnetic field applying means (C in Figure 1) that applies a bias magnetic field in its magnetic detection direction, and according to the two magnetic sensors The angle at which the magnetic detection direction intersects, and the magnetic field detected by the two magnetic sensors, and the bias magnetic field applied by the bias magnetic field applying means, is a means for calculating the orientation (-28-200424545 101a of Fig. 6) , Figure 5 (S5) program. 1 6 · —A recording medium that can be read by a computer, with a program that can degrade the function: The angle at which the magnetic detection directions of the two magnetic sensors are independent of each other (picture 1 of the two magnetic sensors) Below 90 degrees (Lx, Ly in Fig. 1), a bias magnetic field application means (C in Fig. 1) for applying the bias magnetic direction; according to the magnetic detection directions of the two magnetic sensors The magnetic field detected by the two magnetic sensors and the bias magnetic field applied by the loosening means to calculate the position calculation hand 10a, (S5 in Fig. 11) function program. The computer plays such as X, Y) configured to be larger than 0 degrees, I is at the angle of its magnetic detection and yoke, U flat pressure magnetic field application section (Figure 6 -29-