JP2005210291A - Information terminal, azimuth measurement method and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an information terminal in an upper case of which an earth magnetism sensor is fitted that provides an output of appropriate information with respect to an azimuth even when the information terminal is brought into a closing state. <P>SOLUTION: The information terminal (mobile phone) provides the appropriate information with respect to the azimuth by applying an arithmetic operation to the information with respect to the magnetic azimuth sensed by the earth magnetism sensor so that the mobile phone takes the same azimuth in a direction wherein the mobile phone is directed in both of opening and closing states in the case that the upper case is opened/closed by fixing the lower case. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a foldable information terminal equipped with a geomagnetic sensor.

Conventionally, a foldable mobile phone has been proposed in which an upper housing with two displays and a lower housing with a built-in geomagnetic sensor are attached to be openable and closable. (For example, see Patent Document 1)
When the magnetic orientation is measured with the above-described mobile phone, the user holds the lower casing almost horizontally with the lower end of the lower casing in front. The geomagnetic sensor detects information related to the magnetic orientation (hereinafter referred to as “magnetic orientation information”) using the direction in which the mobile phone is directed as a reference direction, and the mobile phone displays an image indicating the magnetic orientation based on this information (hereinafter referred to as “azimuth image” Is displayed.).

By the way, while the number of parts in the lower housing increases with the diversification of functions in recent mobile phones, it is necessary to devise design and improve parts to reduce the size and thickness of mobile phones required by the market. In other words, the geomagnetic sensor is inevitably placed in the upper housing due to its design.
JP 2003-166826 A

However, when the geomagnetic sensor is attached to the upper housing, focusing on the reference direction of the geomagnetic sensor when the mobile phone is directed in the same direction in the open state and the closed state, the reference direction of the geomagnetic sensor is the open state. Reverse direction when closed.
Accordingly, since the same magnetic direction information is not detected in the open state and the closed state, the display opposite to the user of the second display screen from the user's front of the second display screen is temporarily displayed on the display (hereinafter referred to as “second display”) that can be visually recognized in the closed state. When displaying the orientation image so that the mobile phone is facing, the user cannot confirm an appropriate orientation.

The above-mentioned problem is caused not only by the mobile phone but also by an information terminal in which the upper housing and the lower housing are attached so that they can be opened and closed.
The present invention has been made in view of the above problems, and an object of the present invention is to provide a user with an appropriate orientation according to an open / close state even when a geomagnetic sensor is disposed in an upper housing of a foldable information terminal.

  In order to solve the above problem, a foldable information terminal according to the present invention is a foldable information terminal in which an upper housing and a lower housing are connected so as to be openable and closable, and detects an open / closed state of the information terminal. An opening / closing detection means for performing the detection by the opening / closing detection means among a plurality of predetermined computations, a geomagnetic sensor that is fixed to the upper housing and outputs magnetic orientation information indicating the magnetic orientation to which the upper housing is directed, and And calculating means for calculating a magnetic direction in which the lower housing is directed by performing a corresponding calculation on the magnetic direction information output from the geomagnetic sensor.

According to this configuration, even when the geomagnetic sensor is attached to the upper casing of the information terminal, it is possible to output appropriate azimuth information for the direction in which the information terminal is directed according to the usage form of the information terminal. .
Further, the plurality of predetermined calculations are a first calculation and a second calculation, and the calculation means further performs a first calculation and outputs first orientation information when the open / close detection means detects an open state. A first azimuth information generating unit that performs a second calculation and outputs second azimuth information when the open / close detection means detects a closed state, and (2) When the calculation relationship is between the open state and the closed state and the lower casing of the information terminal faces the same direction, the first direction information output in the open state and the second direction information output in the closed state May be determined to be the same.

According to this configuration, the magnetic terminal information output from the geomagnetic sensor is subjected to arithmetic processing so that the information terminal matches in the open state and the closed state, and information indicating the direction with respect to the direction in which the information terminal is directed (hereinafter referred to as `` Can be output.
In addition, the information terminal is further disposed in a first display disposed in a portion that is concealed on the upper housing side when in the closed state, and in a portion that is exposed on the upper housing side in the closed state. A second display, first display control means for generating a first azimuth image based on the first azimuth information and displaying it on the first display, and generating a second azimuth image based on the second azimuth information, Second display control means for displaying on the second display may be provided.

According to this configuration, when the information terminal is open, the orientation is displayed on the first display, and when the information terminal is closed, the appropriate orientation is displayed on the second display. Depending on the direction, the direction can be visually recognized.
Further, the information terminal includes position detection means for detecting the position of the terminal, and the first display control means detects the first orientation information and the position of the terminal when the open / close detection means detects the open state. An image based on the above may be displayed on the first display.

According to this configuration, since the position information is acquired and the image is displayed together with the direction information according to the open / close state of the information terminal and the position information, the direction in which the user is facing the destination is confirmed. can do.
The magnetic orientation measurement method according to the present invention includes magnetic orientation information indicating a magnetic orientation in which an upper housing and a lower housing are connected to each other so as to be opened and closed, and are fixed to the upper housing and the upper housing faces. In a foldable information terminal equipped with a geomagnetic sensor that outputs an open / close state, an open / close detection step for detecting an open / closed state of the information terminal, a step for obtaining the magnetic direction information from the geomagnetic sensor, and the open / close operation among a plurality of predetermined calculations It is also possible to include a calculation step of obtaining a magnetic direction in which the lower housing is directed by performing one calculation according to the detection result by the detection means on the acquired magnetic direction information.

By executing this measurement method in the information terminal, the same effect as described above can be obtained.
The program according to the present invention includes a geomagnetism in which an upper casing and a lower casing are connected so as to be openable and closable, and magnetic direction information indicating a magnetic orientation that is fixed to the upper casing and that the upper casing is facing is output. In a foldable information terminal provided with a sensor, a computer-executable program for obtaining a magnetic orientation in which the lower housing is directed, which causes the computer to execute steps included in the measurement method described above.

By executing this program on the information terminal, it is possible to perform magnetic azimuth output processing with the above-described effects on the information terminal.

<Configuration>
The information terminal according to the present embodiment will be described with reference to FIG.
FIG. 1 is a configuration diagram of the appearance of a foldable mobile phone 100 (hereinafter referred to as “mobile phone 100”) according to an embodiment of the present invention, and FIG. (B) and (c) in the figure show a closed state.

The appearance of the mobile phone 100 will be described with reference to FIGS. 1 (a) and 1 (b).
The mobile phone 100 includes an upper casing 200 and a lower casing 300, and the upper casing 200 and the lower casing 300 are attached to be able to be opened and closed by a shaft 110. The mobile phone 100 is opened and closed by rotating the upper housing 200 about the shaft 110. When the mobile phone 100 is in the open state, the upper housing 200 is opened 180 ° with respect to the lower housing 300. I will explain it on the premise.

The lower casing 300 includes a key operation unit 20 and includes a CPU and a memory (ROM / RAM). The upper housing 200 includes a first display 400 and a second display 410, and includes a geomagnetic sensor 500.
Next, the arrangement of the geomagnetic sensor 500 will be described.
The geomagnetic sensor 500 is mounted on a plane parallel to the plane on which the first display 400 is mounted, including the X-axis sensor and the Y-axis sensor. The X-axis sensor and Y-axis sensor detect the magnetic direction information as the XY component, and the XY component detected by the geomagnetic sensor is (vx, vy). When vx = 0 and vy> 0, the Y axis It is arranged so that the direction is “magnetic north”.

  The X-axis and Y-axis directions of the geomagnetic sensor 500 used as a reference for the XY component detected by the geomagnetic sensor 500 arranged as described above and the magnetic orientation information are displayed on each display (FIG. 1 (a) 400, FIG. ) 410), when the mobile phone 100 is in the open state with reference to FIG. 1 (a) and FIG. This will be described separately when in the closed state.

The XY axis direction of the geomagnetic sensor 500 is the same as the X axis 31b and the Y axis in the same figure when the mobile phone 100 is in the open state (FIG. 1 (a)). This is the Y direction 31a in the figure.
On the other hand, when the mobile phone 100 is in the closed state (FIG. 1 (b)), the X axis as the reference of the XY component detected by the geomagnetic sensor 500 is the X direction 32b, the Y axis is the Y direction 32a in FIG. It becomes.
The XY two-dimensional coordinate space of each display used to display the azimuth image on each display (Fig. 1 (a) 400, Fig. 1 (b) 410) is as follows. The right direction is the X-axis direction, and the direction in which the mobile phone is directed is the Y-axis direction. In this XY two-dimensional coordinate space, the XY-axis direction in each display when representing azimuth information is the X-axis serving as a reference for the XY plane of the first display 400 when the mobile phone 100 is in the open state (FIG. 1 (a)). Is the X direction 10b, and the Y axis is the Y direction 10a.

On the other hand, when the cellular phone 100 is in the closed state (FIG. 1b), the X axis serving as the reference for the XY plane in the second display 410 is the X direction 11b in the figure and the Y axis is the Y direction 11a in the figure.

<Function>
Hereinafter, functions of the mobile phone 100 will be described with reference to the functional block diagram of FIG.

The mobile phone 100 is functionally open / close detection unit 600, geomagnetic sensor 500, first orientation generation unit 700, second orientation generation unit 710, first orientation display control unit 800, second orientation display control unit 810, first display. 400 and a second display 410.
The open / close detection unit 600 has a function of detecting whether the mobile phone 100 is in an open state (FIG. 1 (a)) or a closed state (FIG. 1 (b)). For example, the open / close detection unit 600 includes a switch that opens and closes an electric circuit each time the form of the mobile phone 100 changes between an open state (FIG. 1 (a)) and a closed state (FIG. 1 (b)). By switching, the open / close state of the mobile phone 100 is detected, and a signal indicating an open state or a closed state is output.

The geomagnetic sensor 500 has a function of outputting magnetic direction information as a voltage value.
Direction of the vector (vx, vy) expressed in the XY two-dimensional plane with the voltage value output from the X-axis sensor as the X-axis component (vx) and the voltage value output from the Y-axis sensor as the Y-axis component (vy) Indicates “north” of the magnetic orientation.
The location information acquisition unit 900 is composed of a GPS receiver and a CPU in terms of hardware, the GPS receiver acquires location information transmitted from an external GPS satellite, and the CPU is stored in a storage unit (not shown) of the mobile phone 100. It has a function to extract and generate a map image based on position information acquired from stored map data in Japan.

The first azimuth generation unit 700, the first azimuth display control unit 800, the second azimuth generation unit 710, and the second azimuth display control unit 810 are composed of a CPU and a memory, and indicate the open state output from the open / close detection unit 600. The signal is processed by the first azimuth generation unit 700, and the signal indicating the closed state is processed by the second azimuth generation unit 710. The memory (RAM) receives magnetic direction information from the geomagnetic sensor 500 and stores it.
When receiving the signal indicating the open state, the first orientation generation unit 700 reads the magnetic orientation information from the memory (RAM), performs the first calculation, and the direction in which the lower housing 300 of the mobile phone in the open state is directed By indicating magnetic north with respect to (FIG. 1 (a) Y direction 10a), first orientation information indicating the magnetic orientation in which the lower casing 300 is directed is generated.

The first calculation is a calculation for obtaining the first direction information with respect to the direction (FIG. 1 (a) Y direction 10a) where the mobile phone is directed based on the magnetic direction information, and the first direction information is as follows. Ask for.
In the magnetic direction information of the voltage value detected by the geomagnetic sensor 500 in the open state, the X-axis component is Vx and the Y-axis component is Vy.
In the first direction generation unit 700, the geomagnetic vector (Vx, Vy) in the XY plane of the magnetic direction information is a vector indicating the magnetic direction with respect to the direction in which the lower housing 300 of the mobile phone is directed (Y direction 10a in the figure). The vector (Vx1, Vy1) obtained by projecting the vector (Vx, Vy) onto the XY plane of the first display 400 represents the magnetic orientation relative to the direction in which the lower housing 300 of the mobile phone is directed (Y direction 10a in the figure). It is the 1st direction information shown.

Therefore, the vector (Vx1, Vy1) and the vector (Vx, Vy) satisfy the relationship [Equation 1].
[Equation 1] (Vx1, Vy1) = α (Vx, Vy) (α is a constant)
The first azimuth display control unit 800 generates an image to be displayed on the first display 400 based on the first azimuth information generated from the first azimuth generation unit 700, and the map generated by the position information acquisition unit 900 The image has a function of performing control to rotate the image so as to have the same orientation as the first orientation information and display the image on the first display 400 together with the image based on the first orientation information.

The image generation based on the first orientation information is performed as follows.
The first orientation information is represented by a vector (Vx1, Vy1) indicating the magnetic orientation relative to the Y direction of the first display 400 (Fig. 10a) on the XY plane of the first display 400, and the vector (Vx1, Vy1) A first orientation image is generated so that the orientation is “north” of the magnetic orientation.
Also, the magnetic direction indicated by the first orientation information vector (Vx1, Vy1) on the XY plane of the first display 400 and “north” in the map image based on the location information generated by the location information acquisition unit 900 match. Then, the map image acquired from the position information acquisition unit 900 is generated by being rotated, and the rotated map image and the first orientation image are sent to the first display 400.

When receiving the signal indicating the closed state, the second orientation generation unit 710 reads the magnetic orientation information from the memory (RAM), and the direction in which the lower case 300 of the mobile phone in the closed state is directed (in FIG. 1 (b)). Second direction information for the Y direction 11a) is generated by performing a second calculation.
The second calculation is a calculation for obtaining the magnetic direction with respect to the direction in which the mobile phone is directed based on the magnetic direction information (Y direction 11a in FIG. 1 (b)), and the second direction information is obtained as follows. Ask.

In the magnetic direction information of the voltage value detected by the geomagnetic sensor 500 in the closed state, the X-axis component is Vx ′ and the Y-axis component is Vy ′.
The reference Y direction (FIG. 1 (b) 32a) of the geomagnetic sensor 500 in the closed state points in the opposite direction to the Y direction (FIG. 1 (a) 11a) in the second display 410.
Accordingly, the second orientation generation unit 710 reads the magnetic orientation information represented by the XY component from the memory (RAM), and converts the geomagnetic vector (Vx ′, Vy ′) in the XY plane of the magnetic orientation information to the vector (Vx ′, − Vy ′), and the vector (Vx2, Vy2) obtained by projecting the vector (Vx ′, −Vy ′) onto the XY plane of the second display 410 is the second direction indicating the magnetic direction with respect to the direction of 11a in FIG. Generate as 2-direction information.

The vector (Vx2, Vy2) and the vector (Vx ′, Vy ′) have a relationship satisfying [Equation 2].
[Equation 2] (Vx2, Vy2) = β (Vx ', − Vy') (β is a constant)
Since the direction of vector (Vx1, Vy1) and vector (Vx2, Vy2) is calculated to indicate the same direction by the first operation and the second operation, each of vectors (Vx1, Vy1) and (Vx2, Vy2) The azimuth angles based on the X direction (FIG. 1 (a) 10b, FIG. 1 (b) 11b) are the same.

The second azimuth display control unit 810 performs control to generate a second azimuth image based on the second azimuth information generated by the second azimuth generation unit 700 and display the image on the second display 410.
Since the second orientation information is represented by a vector (Vx2, Vy2) indicating the magnetic orientation with respect to the Y direction (FIG. 1 (b) 11a) in the second display 410, the second orientation display control unit 810 has the vector (Vx2 , Vy2) is generated so that the orientation of the magnetic orientation is “north”, and the image is sent to the second display 410.

The first display 400 and the second display 410 are, for example, liquid crystal displays (LCD), and have a function of displaying an image based on position information and orientation information under the control of the CPU.
A first azimuth image and a map image based on the first azimuth information generated by the first azimuth display control unit 800 are displayed on the first display 400, and based on the second azimuth information generated by the second azimuth display control unit 810. The second orientation image is displayed on the second display 410.

<Operation>
FIG. 3 is a flowchart for displaying azimuth information and position information of the mobile phone 100.
When the user performs an operation for requesting the position information and orientation information of the mobile phone 100 from the key operation unit 20 of the mobile phone 100, the following processing is performed.

The position information acquisition unit 900 acquires the position information of the mobile phone 100, extracts and generates a map image based on the position information, sends it to the memory (RAM) (step S10), and the geomagnetic sensor 500 detects the geomagnetism and detects the mobile phone. The magnetic orientation information for the direction in which the upper casing 200 is directed is sent to the CPU (step S20).
The open / close detection unit 600 determines the open / closed state of the mobile phone 100 (step S30). When the mobile phone 100 is open, the open / close detection unit 600 sends a signal indicating the open state to the first azimuth generating unit 700. A signal indicating the closed state is sent to the second orientation generation unit 710.

  When it is determined in step S30 that the mobile phone 100 is in the open state, the first direction generation unit 700 that has received the signal indicating the open state from the open / close detection unit 600, based on the magnetic direction information sent from the geomagnetic sensor 500, 1.Calculate the first direction information indicating the magnetic direction with respect to the direction (FIG. 1 (a) 10a) in which the lower case 300 of the mobile phone 100 is directed, and send the first direction to the first direction display control unit 800. Information is transmitted (step S60).

  The first azimuth display control unit 800 that has received the first azimuth information generates a first azimuth image based on the first azimuth information in the XY plane of the first display 400, and generates a map image based on the position information acquired in step S10. The map image is read out from the memory (RAM) and rotated so that the magnetic north indicated by the image based on the first orientation information and “north” of the map image coincide, and the rotated map image and the image in the first orientation information are The data is sent to the first display (step S70).

By performing the above processing, the position image and the first orientation image can be displayed on the first display 400 as shown in FIG.
When the mobile phone 100 is determined to be in the closed state in step S30, the second direction generation unit 710 that has received the signal indicating the closed state from the open / close detection unit 600 is based on the magnetic direction information transmitted from the geomagnetic sensor 500. The second calculation generates second direction information indicating the magnetic direction with respect to the direction (FIG. 1 (b) 11a) in which the lower casing 300 of the mobile phone 100 is directed by the second calculation, and sends the second direction to the second direction display control unit 810. Information is transmitted (step S60).

Receiving the second azimuth information, the second azimuth display control unit 810 generates a second azimuth image based on the second azimuth information on the XY plane of the second display 410 and sends it to the second display 410 (step S50).
By performing the above processing, the second orientation image can be displayed on the second display 410 as shown in FIG.

<Supplement>
As mentioned above, although the information terminal concerning the present invention was explained based on the embodiment, the present invention is not limited to these embodiments as a matter of course. Hereinafter, modifications of the embodiment will be described.
(1) Although the cellular phone is shown as the above-described embodiment, it may be a mobile PC or PDA (Personal Digital (Data) Assistants) in which an upper housing and a lower housing are rotatably attached.

  In the case of a mobile phone, the folding type mobile phone is shown in the embodiment. However, the mobile phone may be a type of mobile phone that closes the mobile phone by rotating the upper housing horizontally by 180 ° with a shaft. When this type of mobile phone is closed, the reference direction of the geomagnetic sensor is the Y-axis direction and the X-axis used as the reference for the XY component detected by the geomagnetic sensor when the lower case is fixed and the mobile phone is closed. The direction is the reverse direction, and the X-axis direction is also the reverse direction compared to the two-fold type mobile phone shown in the above embodiment.

In addition, a display that displays a azimuth image on this type of mobile phone is a display (hereinafter referred to as “main display”) that is normally visible to the user when the mobile phone is open, and is on the XY plane of the main display. The X direction and the Y direction are the same as the X direction 11b and the Y direction 11a of the second display 410 in FIG.
Therefore, differences from the above-described embodiment will be described in the case where the direction information is generated and displayed by this type of mobile phone.

  The difference from the embodiment is the generation of the second azimuth information in a state in which the mobile phone is closed, the second azimuth information is the voltage value Vx ′ of the X component indicating the magnetic azimuth information output from the geomagnetic sensor 500, Convert the geomagnetic vector (Vx ', Vy') of the voltage value Vy 'of the Y component in the XY plane to the vector (-Vx', -Vy '), and the vector (-Vx', -Vy ') on the XY plane of the main display ) Is the projected vector (Vx3, Vy3).

The vector (Vx3, Vy3) and the vector (−Vx ′, −Vy ′) satisfy the relationship [Equation 3].
[Equation 3] (Vx3, Vy3) = γ (−Vx ′, − Vy ′) (γ is a constant)

(2) The first direction generation unit 700 and the second direction generation unit 710 are based on the magnetic direction information output from the geomagnetic sensor 500, and the lower case 300 of the mobile phone according to whether the mobile phone 100 is open or closed. It is assumed that the magnetic orientation with respect to the direction in which it is directed is output by calculation. However, in the configuration of the open state and the closed state of the mobile phone 100, the upper housing 200 is horizontally rotated 360 ° and detected at every fixed rotation angle. A table of the relationship between the voltage value of the Y component and the azimuth angle may be stored in the storage unit of the mobile phone 100, and the voltage value output according to the open / close state may be read from the storage unit to obtain the azimuth angle. .

(3) In the above-described embodiment, when the mobile phone 100 is in the closed state, the second orientation generation unit 810 displays only the image based on the second orientation information on the second display 410. A map image to be displayed on the second display 410 is extracted and generated by the position information acquisition unit 900, and the second orientation display control unit 810 similarly to the first orientation display control unit 800 generates a second map of the second orientation information. Control may be performed in which a map image rotated so that the magnetic orientation indicated by the orientation image matches the “north” of the map image is generated and displayed on the second display 410.

(4) The geomagnetic sensor 500 is a two-axis sensor having an XY-axis sensor, which detects the geomagnetism with the XY-axis sensor and outputs the voltage value detected by each sensor, but in the Z-axis direction perpendicular to the XY plane A three-axis geomagnetic sensor that also includes a Z-axis sensor that detects geomagnetism and detects a voltage value may be used. In general, when detecting the direction using a geomagnetic sensor (for two axes), calibration may occur before detecting the direction because errors in the direction occur due to the influence of the vertical component of geomagnetism due to the effect of tilt and the influence of strong magnetic fields other than natural magnetic fields. There is a need to do. Therefore, the initial magnetic field strength and the range of magnetic field strength that may be detected in a state that is not affected by the surrounding magnetic field are tabulated and stored in the storage unit in advance using a triaxial geomagnetic sensor. The detected magnetic field strength may be corrected by calculating a natural magnetic field from the data in the table, and a magnetic orientation excluding a strong magnetic field other than the natural magnetic field may be output. Thus, highly accurate azimuth information can be obtained by using a three-axis geomagnetic sensor.

It is a figure which shows the structure of the mobile telephone which concerns on embodiment of this invention. FIG. 3 is a block diagram showing a functional configuration of a mobile phone according to an embodiment of the present invention. It is an azimuth | direction image display flowchart with a mobile telephone. FIG. 5 is a diagram showing a display example of each display when the mobile phone is in an open state and a closed state.

Explanation of symbols

100 mobile phone
200 upper housing
300 Lower case
400 1st display
410 2nd display
500 geomagnetic sensor
600 open / close detector
700 1st direction generator
710 Second orientation generator
800 1st direction display controller
810 Second orientation display controller
900 Location information acquisition unit
10a Y direction of the first display
10b X direction of the first display
11a Second display Y direction
11b X direction of second display
31a X direction of geomagnetic sensor in open state
31b Y direction of geomagnetic sensor in open state
32a X direction of geomagnetic sensor in closed state
32b Y direction of geomagnetic sensor in closed state

Claims (6)

A foldable information terminal in which an upper housing and a lower housing are connected to be openable and closable,
Open / close detecting means for detecting an open / closed state of the information terminal;
A geomagnetic sensor that is fixed to the upper housing and outputs magnetic orientation information indicating the magnetic orientation that the upper housing is facing;
A calculation means for obtaining a magnetic direction in which the lower housing is directed by performing one calculation according to a detection result by the opening / closing detection means among a plurality of predetermined calculations on the magnetic direction information output from the geomagnetic sensor. An information terminal comprising: The plurality of predetermined calculations are a first calculation and a second calculation,
The computing means is
A first azimuth information generator that performs a first calculation and outputs first azimuth information when the open / close detection means detects an open state;
When the open / close detection means detects a closed state, a second azimuth information generation unit that performs the second calculation and outputs the second azimuth information,
When the lower case of the information terminal faces the same direction in the open state and the closed state, the relationship between the first calculation and the second calculation is output in the closed state with the first orientation information output in the open state. 2. The information terminal according to claim 1, wherein the second direction information is determined to be the same. The information terminal further includes:
A first display arranged in a concealed part on the upper housing side when in the closed state;
A second display disposed in an exposed part on the upper housing side when in the closed state;
First display control means for generating a first orientation image based on the first orientation information and displaying it on the first display;
3. The information terminal according to claim 2, further comprising second display control means for generating a second orientation image based on the second orientation information and displaying the second orientation image on the second display. The information terminal further includes:
Provided with position detecting means for detecting the position of the own terminal,
3. The first display control unit displays an image based on the first orientation information and the position of the terminal itself on the first display when the open state is detected by the open / close detection unit. The described information terminal. A foldable type comprising a geomagnetic sensor in which an upper housing and a lower housing are connected in an openable and closable manner and output magnetic direction information indicating a magnetic orientation that is fixed to the upper housing and that the upper housing faces. In the information terminal
An open / close detection step for detecting an open / closed state of the information terminal;
Obtaining the magnetic orientation information from the geomagnetic sensor;
A calculation step for obtaining a magnetic orientation in which the lower housing is facing by performing, on the acquired magnetic orientation information, one computation corresponding to a detection result by the open / close detection means among a plurality of predetermined computations. A measuring method characterized by the above. A foldable type comprising a geomagnetic sensor in which an upper housing and a lower housing are connected in an openable and closable manner and output magnetic direction information indicating a magnetic orientation that is fixed to the upper housing and that the upper housing faces. In the information terminal
A computer-executable program for determining the magnetic orientation in which the lower housing is facing,
6. A program for causing a computer to execute each step according to claim 5.

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