JP3754289B2 - Attitude angle detection device for portable terminal device and magnetic direction detection device for portable terminal device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention detects a posture angle such as a direction in which a mobile terminal is facing or a tilt angle in a mobile terminal having a radio wave transmission / reception function such as a mobile phone, a PHS, or a data terminal with a built-in mobile phone function. The present invention relates to a suitable attitude angle detection device for mobile terminal equipment and a magnetic orientation detection device for mobile terminal equipment.
[0002]
[Prior art]
In recent years, it has been proposed to provide services such as a map information service and a man navigation system using a posture angle sensor or a magnetic direction sensor for a mobile phone or a simple mobile phone (hereinafter collectively referred to as a mobile phone).
[0003]
Since mobile phones are sometimes used while moving over long distances, methods such as magnetic, ultrasonic, and optical methods with limited detection ranges cannot be used as posture angle detection methods. Therefore, an inertial posture angle detection sensor using an inertial sensor such as a gyroscope and an acceleration sensor and a geomagnetic sensor, whose use range is not limited, is used.
[0004]
In addition, when detecting the magnetic direction using a magnetic direction sensor, in order to know the direction of electrical orientation, the magnitude of the geomagnetism is usually measured using a biaxial geomagnetic sensor, and the north direction is usually used. A method of calculating an angle formed from the geomagnetic direction is used. As a geomagnetic detection method, a flux gate method, a magnetoresistive element, a Hall element, or the like is used.
[0005]
[Problems to be solved by the invention]
However, sensors such as a gyroscope and a geomagnetic sensor included in the inertial attitude angle detection sensor receive a radio wave interference transmitted from a mobile phone in order to handle a weak electric signal, and are particularly intermittently transmitted. When the strength of the radio wave is high, the output is not accurate. Furthermore, since the attitude angle is calculated from the output of the gyro and the geomagnetic sensor including this error, there is a problem that the attitude angle output does not become a correct value.
[0006]
In other words, if the azimuth angle is calculated from the output of the geomagnetic sensor including this error, there has been a problem that a map of the wrong direction is displayed.
[0007]
The present invention solves the above-mentioned problems, relaxes restrictions on places and environments to be used without being affected by radio waves oscillated from mobile terminals and bad radio wave environments, has few malfunctions that can be used widely, and is accurate. A good attitude angle detection device for mobile terminal equipment and a magnetic orientation detection device for mobile terminal equipment are provided.
[0008]
[Means for Solving the Problems]
The present invention detects an angular velocity or an angle as an electric signal in a posture angle detection device for a portable terminal device that is built in or externally attached to a portable terminal device and detects a posture angle such as a direction or inclination of the portable terminal device. A sensor, a posture angle calculating means for calculating a posture angle from the output of the sensor, and a radio wave intensity detecting means for detecting the strength of a radio wave in the vicinity of the sensor, wherein the posture angle calculating means is the radio wave intensity detecting means. When the detected signal strength exceeds the preset reference signal strength, it is determined that the sensor output signal is incorrect, and calculation of the attitude angle using the incorrect sensor signal is stopped. This is a featured attitude angle detection device for portable terminal equipment.
[0009]
The present invention is the attitude angle detection device for a portable terminal device, wherein the attitude angle calculation means is connected to the radio wave intensity detection means and a memory that stores the reference radio wave intensity.
[0010]
Further, in the posture angle detection device for a mobile terminal device according to the present invention, when it is determined that the output signal of the sensor is incorrect, the calculation of the posture angle is stopped, and the previous sensor signal is not incorrect. A calculation method of a posture angle detection device for a portable terminal device, characterized by outputting a posture angle calculation result.
[0011]
In addition, the present invention provides the attitude angle detecting device for mobile terminal equipment, wherein the attitude angle detecting device for mobile terminal equipment comprises at least a biaxial geomagnetic sensor as the sensor for detecting the angular velocity and the angle. .
[0012]
Further, the present invention is characterized in that, in the attitude angle detection device for a mobile terminal device, as the sensors for detecting the angular velocity and the angle, at least one or more tilt sensors and at least two or more geomagnetic sensors are provided. It is a posture angle detection device for portable terminal equipment.
[0013]
Further, according to the present invention, in the attitude angle detection device for a mobile terminal device, as the sensor for detecting the angular velocity and the angle, at least a biaxial gyro, at least a single tilt sensor, and at least a biaxial geomagnetic sensor are used. A posture angle detection device for a mobile terminal device, comprising:
[0014]
According to the present invention, in the attitude angle detection device for a mobile terminal device, the radio wave intensity detection means includes a coil antenna, a rectifier circuit, and a comparator. It is.
[0022]
The present invention relates to a magnetic orientation detection device for a mobile terminal device that is built in or externally attached to a mobile terminal device and detects the direction in which the mobile terminal device is facing. A sensor, an azimuth angle calculating means for calculating an azimuth angle from the output of the geomagnetic sensor, and a radio wave intensity detecting means for detecting the strength of the radio wave in the vicinity of the geomagnetic sensor, wherein the azimuth angle calculating means When the radio field intensity output from the detection means exceeds a preset standard radio field intensity, the sensor output signal is determined to be incorrect, and the magnetic azimuth angle is calculated using the incorrect sensor signal. There is no magnetic azimuth detecting device for portable terminal equipment.
[0023]
The present invention is the magnetic azimuth detecting device for a portable terminal device, wherein the azimuth angle calculating means is connected to the radio wave intensity detecting means and a memory for storing the reference radio wave intensity.
[0024]
Further, in the magnetic azimuth detecting device for a mobile terminal device, the present invention stops the calculation of the magnetic azimuth angle when the radio wave intensity detecting means determines that the output signal of the sensor is incorrect, and the previous sensor It is a magnetic azimuth detecting device for a portable terminal device that outputs an azimuth angle calculation result when a signal is not erroneous.
[0025]
Further, the present invention is the above-mentioned magnetic azimuth detecting device for portable terminal equipment, wherein the radio wave intensity detecting means is composed of a coil antenna, a rectifier circuit, and a comparator.
[0026]
DETAILED DESCRIPTION OF THE INVENTION
A posture angle detection device for a mobile terminal device and a magnetic direction detection device for a mobile terminal device according to embodiments of the present invention will be described below.
[0027]
(Embodiment 1)
FIG. 1 is an explanatory diagram of a usage state of a mobile phone equipped with a mobile terminal device attitude angle detection device according to Embodiment 1 of the present invention. In FIG. 1, the mobile phone 1 changes the map displayed on the display 1a in conjunction with the orientation of the mobile phone 1, and the direction in which the mobile phone 1 is facing, that is, the direction in which the user is facing, is displayed. On the map displayed in 1a, the map is always rotated and displayed so as to be on the top.
[0028]
As shown in FIG. 1, the mobile phone 1 is provided with a posture angle detection device 2 for mobile terminal equipment of the present invention. Reference numeral 3 denotes a map information generator of the base station. Here, mutual data is exchanged between the mobile phone 1 and the map information generating device 3 by electromagnetic waves.
[0029]
For example, when facing north, the mobile terminal device attitude angle detection device 2 transmits the measured attitude angle of the mobile phone 1, that is, the orientation, to the base station, and the map information generating device 3 in the base station Is transmitted to the mobile phone 1, so that a map with north facing upward is displayed, and map information of 360 degrees can be obtained depending on the orientation of the mobile phone 1.
[0030]
FIG. 2 is a block diagram showing the overall configuration of the attitude angle detection device for portable terminal equipment of the present invention. As shown in FIG. 2, a posture angle calculation unit 41 that obtains a posture angle from the outputs of the three gyros 11, 12, 13, 2, the acceleration sensors 21, 22, and the two geomagnetic sensors 31, 32; It is comprised with the field intensity detection part 51 to detect.
[0031]
Furthermore, the attitude angle calculation unit 41 in the attitude angle detection device for mobile terminal equipment of the present invention will be described in detail. As shown in Japanese Patent Laid-Open No. 11-211144, a motion angle, which is a first temporary posture angle, is obtained from three gyros 11, 12, 13, and two acceleration sensors 21, 22, and two From the geomagnetic sensors 31 and 32, a static angle which is a second temporary posture angle is obtained. Next, after determining whether or not the stationary angle is correct, the posture angle is obtained by combining the motion angle and the stationary angle.
[0032]
FIG. 3 is a block diagram illustrating a circuit configuration of a radio wave intensity detection unit in the attitude angle detection device for a mobile terminal device according to the present invention. As shown in FIG. 3, the coil antenna 52, the rectifier circuit 53, and the comparator 54 are configured. With this configuration, it is possible to detect radio waves and output a voltage proportional to the radio field intensity.
[0033]
When the output of the signal strength detector is smaller than the reference signal strength value preset in the memory, the calculated attitude angle calculated above is output, and when the output is greater than the reference signal strength value, The attitude angle data calculated last time is output without updating the angle.
[0034]
FIG. 4 is a flowchart showing the entire function of the attitude angle detecting device for portable terminal equipment according to the present invention described so far.
[0035]
Therefore, when the mobile terminal device posture angle detection device of the present invention is applied to a mobile phone as in the embodiment of the present invention, accurate posture angle information can be obtained without being adversely affected by radio waves. .
[0036]
In the embodiment of the present invention, two examples of the geomagnetic sensor and the acceleration sensor are shown, but the same function can be realized even if at least one of them is three. However, the embodiment of the present invention is most preferable in terms of downsizing.
[0037]
(Embodiment 2)
FIG. 5 is an explanatory diagram of a use state of a mobile phone equipped with a magnetic orientation detection device for mobile terminal equipment according to Embodiment 2 of the present invention. In FIG. 5, the mobile phone 1 changes the map displayed on the display 1a in conjunction with the orientation of the mobile phone 1, and the direction in which the mobile phone 1 is facing, that is, the direction in which the user is facing is the display 1a. The map displayed on the screen is always rotated so that it is always on the top.
[0038]
As shown in FIG. 5, the mobile phone 1 is provided with a magnetic orientation detection device 7 for mobile terminal equipment of the present invention. Reference numeral 3 denotes a map information generating device 3 of the base station. Here, mutual data is exchanged between the mobile phone 1 and the map information generating device 3 by electromagnetic waves.
[0039]
For example, when facing north, the mobile terminal device magnetic azimuth detecting device 7 transmits the measured attitude angle of the mobile phone 1, that is, the azimuth to the base station, and the map information generating device 3 in the base station Is transmitted to the mobile phone 1, so that a map with north facing upward is displayed, and map information of 360 degrees can be obtained depending on the orientation of the mobile phone 1. Moreover, the map information with respect to the position may be received and displayed by rotating the map information in accordance with the direction on the mobile phone 1 side.
[0040]
FIG. 6 is a block diagram showing the overall configuration of the magnetic orientation detection device for mobile terminal equipment according to the present invention. As shown in FIG. 6, it comprises an azimuth angle calculation unit 41a for obtaining a magnetic azimuth angle from the outputs of two geomagnetic sensors 31a and 32a and a radio wave intensity detection unit 51a for detecting radio waves.
[0041]
Next, the azimuth angle calculation unit in the magnetic azimuth detecting device for portable terminal equipment of the present invention will be further described. The azimuth angle is calculated from the outputs of the two geomagnetic sensors 31a and 32a. If the outputs of the two geomagnetic sensors 31a and 32a are Mx (n) and My (n), respectively, and the magnetic azimuth angle to be obtained is θ (n), the following equation (1) is obtained.
[0042]
^{θ (n) = - tan -} 1 [My (n) / Mx (n)] ······ (1)
[0043]
Here, in the magnetic azimuth detecting device for mobile terminal equipment of the present invention, the configuration of the radio wave intensity detecting unit is the same as the radio wave intensity detecting unit in the attitude angle detecting device for mobile terminal equipment according to the first embodiment. . That is, it is composed of a coil antenna, a rectifier circuit and a comparator, and is the same as FIG. With this configuration, radio waves can be detected and a voltage proportional to the radio field intensity can be output.
[0044]
When the output of the radio wave intensity detection unit is smaller than the reference radio wave intensity value set in advance in the memory, the magnetic azimuth angle calculated this time is output, and when the output is larger than the reference radio wave intensity value, The data of the magnetic azimuth angle calculated last time is output without updating the magnetic azimuth angle.
[0045]
FIG. 7 is a flowchart showing the entire function of the magnetic direction detecting device for portable terminal equipment according to the present invention described so far.
[0046]
Therefore, as in the embodiment of the present invention, when the magnetic azimuth detecting device for mobile terminal equipment of the present invention is applied to a mobile phone, accurate magnetic azimuth angle information can be obtained without being adversely affected by radio waves. it can.
[0047]
【The invention's effect】
According to the present invention, there is no influence on radio waves oscillated from a mobile terminal or a bad radio wave environment, and the restrictions on the place and environment to be used are relaxed, and there are few malfunctions that can be widely used, and the attitude for mobile terminal equipment is accurate. An angle detection device and a magnetic orientation detection device for a portable terminal device can be provided.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram of a usage state of a mobile phone equipped with a posture angle detection device for a mobile terminal device according to Embodiment 1 of the present invention.
FIG. 2 is a block diagram showing an overall configuration of a posture angle detection device for a mobile terminal device according to the present invention.
FIG. 3 is a block diagram showing a circuit configuration of a radio wave intensity detection device in the attitude angle detection device for a mobile terminal device according to the present invention.
FIG. 4 is a flowchart showing the entire attitude angle detection device for a portable terminal device according to the present invention.
FIG. 5 is an explanatory diagram of a usage state of a mobile phone equipped with a magnetic orientation detection device for mobile terminal equipment according to a second embodiment of the present invention.
FIG. 6 is a block diagram showing the overall configuration of the magnetic orientation detection device for portable terminal equipment of the present invention.
FIG. 7 is a flowchart showing the entirety of the magnetic azimuth detecting device for portable terminal equipment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Mobile phone 1a (Mobile phone) Display 2 Attitude angle detection device 3 for mobile terminal equipment Map information generating device 7 Magnetic orientation detection device 8 for mobile terminal equipment Personal computer 11 (first) gyro 12 (second) gyro 13 (third) gyro 21 (first) acceleration sensor 22 (second) acceleration sensor 31, 31a (first) geomagnetic sensor 32, 32a (second) geomagnetic sensor 41 attitude angle calculation unit 41a magnetic Direction calculation unit 51 Radio wave intensity detection unit 51a Radio wave intensity detection unit 52 Coil antenna 53 Rectifier circuit 54 Comparator 61 Memory

Claims (11)

In a mobile terminal device posture angle detection device that is built in or externally attached to a mobile terminal device and detects a posture angle such as a direction or inclination of the mobile terminal device, a sensor that detects an angular velocity or an angle as an electrical signal; A posture angle calculating means for calculating a posture angle from the output of the sensor and a radio wave intensity detecting means for detecting the strength of the radio wave in the vicinity of the sensor, wherein the posture angle calculating means is a radio wave detected by the radio wave intensity detecting means. When the strength exceeds a preset reference radio wave strength, it is determined that the sensor output signal is incorrect, and the calculation of the attitude angle using the incorrect sensor signal is stopped. Posture angle detection device for terminal equipment. 2. The attitude angle detecting device for mobile terminal device according to claim 1, wherein the attitude angle calculating means is connected to the radio wave intensity detecting means and a memory for storing the reference radio wave intensity .  When the mobile terminal device posture angle detection device determines that the output signal of the sensor is incorrect by the radio wave intensity detection means, the calculation of the posture angle is stopped, and the previous sensor signal is not incorrect. The posture angle detection device for a mobile terminal device according to claim 1, wherein a calculation method for outputting a posture angle calculation result is performed.  The attitude for a mobile terminal device according to any one of claims 1 to 3, wherein the attitude angle detection device for a mobile terminal device includes at least a biaxial geomagnetic sensor as the sensor for detecting the angular velocity and the angle. Angle detection device.  The attitude angle detection device for a mobile terminal device includes at least one or more tilt sensors and at least two or more geomagnetic sensors as sensors for detecting the angular velocity and angle. The attitude angle detection apparatus for portable terminal apparatuses in any one.  In the mobile terminal device attitude angle detection device, the sensor for detecting the angular velocity and the angle includes at least a biaxial gyro, at least a monoaxial tilt sensor, and at least a biaxial geomagnetic sensor. The attitude angle detection device for a portable terminal device according to any one of claims 1 to 3.  The portable terminal device according to any one of claims 1 to 6, wherein in the attitude angle detection device for a portable terminal device, the radio wave intensity detection means includes a coil antenna, a rectifier circuit, and a comparator. Posture angle detector. In a magnetic orientation detection device for a mobile terminal device that is built in or externally attached to a mobile terminal device and detects a direction in which the mobile terminal device is facing, a biaxial or more geomagnetic sensor that detects the strength of geomagnetism as an electrical signal; An azimuth angle calculating means for calculating an azimuth angle from the output of the geomagnetic sensor and a radio wave intensity detecting means for detecting the intensity of the radio wave in the vicinity of the geomagnetic sensor, wherein the azimuth angle calculating means is an output of the radio wave intensity detecting means. When the signal strength exceeds the preset reference signal strength, the sensor output signal is judged to be incorrect and the magnetic azimuth angle is not calculated using the incorrect sensor signal. A magnetic azimuth detecting device for portable terminal equipment. 9. The magnetic azimuth detecting apparatus for a mobile terminal device according to claim 8, wherein the azimuth angle calculating means is connected to the radio wave intensity detecting means and a memory for storing the reference radio wave intensity .  In the magnetic orientation detection device for mobile terminal equipment, when the output signal of the sensor is determined to be incorrect by the radio wave intensity detection means, the calculation of the magnetic orientation angle is stopped, and the previous sensor signal is not incorrect 10. The magnetic azimuth detecting device for portable terminal device according to claim 8, wherein the azimuth angle calculation result is output.  11. The mobile terminal device according to claim 8, wherein the radio field intensity detecting means includes a coil antenna, a rectifier circuit, and a comparator. Magnetic orientation detector.

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