JP2002168629A - Mounting method for magnetic direction detector for portable terminal device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method, in which a magnetic direction detector for a portable terminal device is mounted with satisfactory accuracy, when a portable telephone is used in a natural style without giving load to a user. SOLUTION: In the mounting method for the magnetic direction detector for the portable terminal device, which is built-in or externally connected to, the portable telephone 1 and which detects the direction of the portable telephone 1, the magnetic direction detector 2 for the portable terminal device is constituted of terrestrial magnetism sensors 31, 32 of two or more axes, which detect the strength of geomagnetism and an azimuth-computing part which computes the magnetic azimuth. In the mounting method for the magnetic direction detector for the portable terminal device, the detection reference face of the detector 2 is mounted at an angle of 30 deg.±20 deg., with respect to the plane of the portable telephone 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a portable terminal having a function of transmitting and receiving radio waves, such as a portable telephone, a PHS, and a data terminal with a built-in portable telephone function. The present invention relates to a method of mounting a magnetic azimuth detecting device for a portable terminal device suitable for detection.

[0002]

2. Description of the Related Art In recent years, mobile phones and simple mobile phones (hereinafter, referred to as mobile phones).
It is proposed to provide services such as map information services and man navigation to mobile phones (collectively referred to as mobile phones). At present, in order to know the direction in which the magnetic head is electrically oriented, a method of measuring the magnitude of geomagnetism using a two-axis geomagnetic sensor and calculating the angle formed from the geomagnetic direction, which is normally north, is used. As a method of detecting geomagnetism, a flux gate method, a magnetoresistive element, a Hall element, and the like have been used.

In general, these geomagnetic sensors can detect geomagnetism in two orthogonal directions X and Y with one element.
When the detection plane including the detection axes X and Y coincides with the horizontal plane, the azimuth angle θ is expressed by M
Assuming x and My, it is given by the following equation (1).

Θ = −tan ⁻¹ (My / Mx) (1) As described above, this equation is valid only when the detection surface is horizontal.

In a conventional magnetic azimuth sensor for portable terminal equipment, two magnetic azimuth sensors are arranged in parallel or perpendicular to a circuit board inside the portable terminal equipment.
It is common to install a magnetic sensor for the shaft. In this case, when measuring the azimuth, for example, in the case of a mobile phone, hold the mobile phone horizontally (the antenna direction is forward and the screen is facing up) and then press the button of the mobile phone to measure the azimuth The measurement must be done after leveling.

[0006]

When a portable telephone is used in a normal state (for example, a standing state, a walking state, or a sitting state) by holding the portable telephone in a hand, a display of a portable terminal device (for example, When operating the button with the thumb while looking at the screen, the angle between the reference plane of the mobile phone and the horizontal plane is generally in the range of 30 degrees ± 20 degrees.

Therefore, in the conventional magnetic direction sensor in which the reference plane of the mobile phone and the detection plane of the sensor are mounted in parallel, there is a problem that an error occurs in the direction because the detection plane of the sensor is not horizontal. Alternatively, there is a problem that the user feels inconvenient because the user is forced to use it horizontally.

[0008] The present invention solves the above problems, and when attached to a portable terminal, without imposing a load on the user.
An object of the present invention is to provide a method of mounting a magnetic azimuth detecting device for a mobile terminal device with high detection accuracy when used in a natural style.

[0009]

An azimuth angle detecting device for a portable terminal device which detects the direction of the portable terminal by being built in or externally connected to a portable terminal such as a portable telephone, a PHS, a portable personal computer, and the like. The azimuth angle sensor comprises two or more axes of geomagnetic sensors for detecting strength as an electric signal, and azimuth angle calculation means for calculating an azimuth angle. A method for mounting an azimuth angle detecting device for a portable terminal device, characterized in that the surface is mounted at an inclination of 30 degrees ± 20 degrees.

The present invention also relates to the azimuth angle detecting device for portable terminal equipment of the above azimuth angle detecting device, wherein three planes, X axis,
The XY plane of the Y axis and the Z axis (the X axis is the upward direction toward the display screen of the mobile terminal, the Y axis is the left direction, and the Z axis is the front direction), and the X axis is 30 degrees around the Y axis An azimuth angle detecting device for a portable terminal device, wherein the geomagnetic sensor is mounted so as to be arranged on an X′Y plane when an axis formed by rotating ± 20 degrees is an X ′ axis. How to attach.

That is, the present invention relates to a method of mounting a magnetic azimuth detecting device for a portable terminal device which is built in or externally connected to the portable terminal device and detects the direction of the portable terminal.
The magnetic azimuth detecting device for a portable terminal device, a two-axis or more geomagnetic sensor for detecting the intensity of geomagnetism as an electric signal,
An azimuth angle calculation unit for calculating an azimuth angle, wherein the detection reference plane of the magnetic azimuth detection device is mounted at an angle of 30 degrees ± 20 degrees with respect to the plane of the display of the mobile device terminal. This is a mounting method of the magnetic azimuth detecting device for the device.

The present invention also relates to the method of mounting the magnetic azimuth detecting device for a portable terminal device, wherein the detection reference plane of the terrestrial magnetism sensor corresponds to a plane of the display of the portable terminal device and one side in a lateral direction of the display. 3 as the axis
This is a mounting method of a magnetic azimuth detecting device for a portable terminal device mounted so as to be in a plane parallel to a plane rotated by 0 ° ± 20 °.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A method for mounting a magnetic azimuth detecting device for a portable terminal device according to an embodiment of the present invention will be described below.

FIG. 1 is an explanatory diagram of a use state in a portable telephone equipped with a magnetic azimuth detecting device for portable terminal equipment according to an embodiment of the present invention. In FIG. 1, a mobile phone 1
Means that the map displayed on the display changes in conjunction with the orientation of the mobile phone, and the direction in which the mobile phone is facing, that is, the direction in which the user is facing, is always up on the map displayed on the display It is displayed as if rotated.

For example, when facing north, the magnetic azimuth detecting device 2 transmits the measured azimuth angle of the mobile phone 1 to the base station, and the map information generating device 3 in the base station is in the azimuth. Since the map information is transmitted to the mobile phone 1, a map in which the north is up is displayed, and the map information is provided so that 360-degree map information can be obtained depending on the orientation of the mobile phone 1.

As shown in FIG. 1, a mobile phone 1 is provided with a magnetic azimuth detecting device 2 according to the present invention. Also,
Reference numeral 3 denotes a map information generator of the base station.

FIG. 2 is a diagram showing an arrangement of a terrestrial magnetism sensor in a magnetic azimuth detecting device for a portable terminal device according to an embodiment of the present invention.

Here, in the method of mounting the magnetic azimuth detecting device for a portable terminal device, the detection reference plane of the terrestrial magnetism sensor may be a plane of the display of the portable terminal device.
The straight line in the direction of the short side of the mobile terminal device is set as 30
It is mounted so as to be in a plane parallel to the plane rotated to the operation surface side by ± 20 degrees.

Here, if the mounting angle is less than 10 degrees, the accuracy of the magnetic azimuth detection angle is reduced as in the prior art, and if the mounting angle is more than 50 degrees, the output voltage with respect to the magnetic azimuth is reduced. The absolute value of is insufficient. Therefore, a mounting angle of 30 degrees ± 20 degrees is selected.
In this way, when the mobile phone is used naturally in a hand, the detection surface of the magnetic azimuth detecting device 2 is substantially horizontal, so that a correct output can be obtained.

FIG. 3 is a diagram comparing the arrangement of the terrestrial magnetism sensor in the magnetic azimuth detecting device for portable terminal equipment according to the embodiment of the present invention and the arrangement of the terrestrial magnetism sensor in the azimuth angle detecting device of the present invention in more detail with the conventional example. It is. FIG. 3A shows an arrangement of a geomagnetic sensor in a conventional example, and FIG. 3B shows an arrangement of a geomagnetic sensor in the present invention.

The three axes (X-axis, Y-axis, and Z-axis) orthogonal to each other are such that the X-axis is upward in the direction toward the display screen of the portable terminal, the Y-axis is leftward, and the Z-axis is forward. The axis to represent. Therefore, the reference plane of the mobile phone is XY
It becomes a plane.

The conventional geomagnetic sensor 31 is arranged so that two sensitivity axes are parallel to the X axis and the Y axis, respectively, and are orthogonal to each other. Therefore, the conventional geomagnetic sensor 31
Is an XY plane, which coincides with the reference plane of the mobile phone.

Here, an axis obtained by rotating the X axis by 30 degrees around the Y axis is defined as an X 'axis. At this time, the geomagnetic sensor 32 of the present invention is arranged so that the two sensitivity axes are parallel to the X ′ axis and the Y axis, respectively, and are orthogonal to each other. That is, the reference plane XY plane of the mobile phone and the detection plane X′Y plane of the azimuth angle detection device are arranged so as to have a 30 ° inclination.

FIG. 4 is a block diagram of a magnetic azimuth detecting device for a portable terminal device according to an embodiment of the present invention. As shown in FIG. 4, the magnetic azimuth detecting device for a portable terminal device includes geomagnetic sensors 31 and 32 and a magnetic azimuth calculating unit 41.

Next, the magnetic azimuth calculating means in the magnetic azimuth detecting device for portable terminal equipment of the present invention will be described. The azimuth angle is obtained from the outputs of the two geomagnetic sensors. The outputs of the two geomagnetic sensors are Mx (n) and My (n), respectively.
Assuming that the azimuth angle to be obtained is θ (n), the azimuth angle is obtained as in the following equation (2).

Θ (n) = − tan ⁻¹ [My (n) / Mx (n)] (2)

[0027]

According to the azimuth angle detecting device for portable terminal equipment of the present invention, when using a portable telephone, for example, the antenna of the portable telephone is directed in the traveling direction and the azimuth is detected when a button is pressed. When such operations are performed, the detection surface of the magnetic azimuth sensor and the horizontal plane almost match when used in a natural style without imposing a load on the user, and a magnetic azimuth detecting device for portable terminal equipment with high detection accuracy is provided. Can be provided.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a use state in a mobile phone equipped with a magnetic azimuth detecting device for a mobile terminal device according to an embodiment of the present invention.

FIG. 2 is a diagram showing an arrangement of a geomagnetic sensor in the magnetic azimuth detecting device for a portable terminal device according to the embodiment of the present invention.

FIG. 3 shows an arrangement of a geomagnetic sensor in a magnetic azimuth detecting device for a portable terminal device according to an embodiment of the present invention.
The figure compared with the conventional example further in detail. FIG. 3A is a diagram illustrating an arrangement of a geomagnetic sensor in a conventional example, and FIG. 3B is a diagram illustrating an arrangement of a geomagnetic sensor according to the present invention.

FIG. 4 is a block diagram of a magnetic azimuth detecting device for a portable terminal device according to an embodiment of the present invention.

[Description of Signs] 1 mobile phone 1a display 2 magnetic azimuth detecting device 3 map information generating device 8 personal computer 31 conventional geomagnetic sensor 32 geomagnetic sensor of the present invention 41 magnetic azimuth calculating unit

Claims (2)

[Claims] 1. A method of mounting a magnetic azimuth detecting device for a mobile terminal device which is built in or connected to a mobile terminal device and detects the direction of the mobile terminal, wherein the magnetic azimuth detecting device for the mobile terminal device includes The magnetic azimuth detecting device comprises a geomagnetic sensor having two or more axes for detecting the intensity as an electric signal, and an azimuth angle calculating means for calculating an azimuth angle. Mounting the magnetic azimuth detecting device for a portable terminal device at an angle of 30 ° ± 20 °. 2. The method of attaching a magnetic azimuth detecting device for a portable terminal device according to claim 1, wherein the detection reference plane of the terrestrial magnetism sensor includes a plane of the display of the portable terminal device and a horizontal side of the display as an axis. 2. The method according to claim 1, wherein the magnetic azimuth detecting device is mounted so as to be in a plane parallel to a plane rotated by ± 20 degrees.