JP2010020708A - Electronic device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electronic device, capable of performing opening/closing detection using a magnetic sensor without needing a magnet, and enhancing the flexibility of power control to a display part. <P>SOLUTION: The device includes a device body 23, and a rotating part 22 rotatably supported on the device body 23, the rotating part 22 including the display part 21, and the rotating part 22 rotating between a first closed attitude in which the display part 21 is closed toward the device body 23 and a display attitude in which the display part 21 is separated from the device body 23. The rotating part 22 includes a three-axial geomagnetic sensor 1, and the rotating operation of the rotating part 22 between the first closed attitude and the display attitude is detected based on the output of the geomagnetic sensor 1 to control power supply to the display part 21. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an electronic device that does not require a magnet in open / close detection using a magnetic sensor and can increase the degree of freedom of power control for a display unit.

  The invention described in the following Patent Document 1 discloses an invention of an information terminal incorporating a geomagnetic sensor for detecting a direction. Patent Document 1 describes that a switch or the like that opens and closes an electric circuit each time the foldable mobile phone changes between an open state and a closed state, and detects the opening and closing of the foldable mobile phone by switching the connection of the switch. (Refer to [0019] column of Patent Document 1).

  Instead of opening / closing detection by a mechanical switch as described in Patent Document 1, in the invention described in Patent Document 2 below, opening / closing detection of a folding mobile phone is performed by a combination of a magnet and a magnetic sensor. Yes. That is, the magnet is housed in the first housing, the magnetic sensor is housed in the second housing, and the magnetic sensor detects the external magnetic field from the magnet to perform opening / closing detection.

However, the invention described in Patent Document 2 has the following problems.
First, it requires a magnet. For this reason, the number of parts increased. Further, since the magnetic sensor must be installed in a place where the external magnetic field from the magnet can be captured when the first housing and the second housing are closed, the degree of freedom in arrangement is low. In the configuration in which the front and back of the first housing provided with the display unit can be reversed, a magnet or a magnetic sensor is further required to detect whether or not the reversing operation has been performed. For this reason, the number of parts has increased, and the degree of freedom of arrangement of the magnetic sensor and the magnet has decreased.

  In addition, in the open / close detection using a combination of a magnet and a magnetic sensor, the power supply cannot be controlled for the display unit unless the magnetic sensor reaches a distance that can capture the external magnetic field from the magnet.

  In particular, a display unit in a notebook personal computer is a part that consumes very much power in the entire apparatus. Therefore, in the notebook personal computer, it is necessary to finely control the power supply for the display unit.

  When the open / close switch of Patent Document 2 is used for a notebook personal computer, for example, the rotating part provided with the display part is closed halfway with respect to the main body of the device having a keyboard on the surface. When the distance is such that the sensor cannot capture the external magnetic field from the magnet, it cannot be detected that the sensor is closed, and the power source of the display unit cannot be switched to the power saving mode.

Therefore, the combination of the magnet and the magnetic sensor described in Patent Document 2 cannot increase the degree of freedom of power control for the display unit.
JP-A-2005-210291 Japanese Patent No. 3807296

  Therefore, the present invention is for solving the above-described conventional problems, and does not require a magnet in open / close detection using a magnetic sensor and can increase the degree of freedom of power control for the display unit. The purpose is to provide.

The electronic device according to the present invention includes a device main body and a rotating portion that is rotatably supported by the device main body. The rotating portion includes a display unit, and the rotating unit includes the display unit. Between the first display posture in which the part is raised with respect to the device main body, the first closed posture in which the display unit is closed toward the device main body, the first display posture, and the first From the display posture, the rotating portion is rotated in a direction opposite to the first closed posture, and the display portion rotates between the second display posture in which the display portion faces the same direction as the surface of the device body. Is movable,
The rotating part has a built-in triaxial geomagnetic sensor,
Based on the output of the geomagnetic sensor, the rotation operation of the rotation unit between the first closing posture and the first display posture, and between the first display posture and the second display posture. Each of the rotation operations of the rotation unit can be detected.

  In the present invention, in the opening / closing detection using the magnetic sensor, no magnet is required by using the triaxial geomagnetic sensor. And in this invention, based on the output of a 3 axis | shaft geomagnetic sensor, rotation operation | movement of the rotation part between a 1st closing attitude | position and a 1st display attitude | position, and a 1st display attitude | position and a 2nd display attitude | position It is possible to detect the rotation operation of the rotation unit between each other.

  In the present invention, it is preferable to perform display control of the display unit by detecting a rotating operation of the rotating unit. In the present invention, the degree of freedom of display control for the display unit can be increased based on the output from the geomagnetic sensor.

  In the present invention, it is preferable to perform power control of the display unit by detecting a rotation operation of the rotation unit between the first closed posture and the first display posture.

  In the present invention, it is preferable that the power saving mode of the display unit is switched based on a rotation speed from the display posture to the first closed posture. Thereby, the freedom degree of switching of a power saving mode can be raised with a simple structure.

  In the present invention, it is preferable that an acceleration sensor is built in the rotating portion. This makes it possible to switch the power saving mode with higher accuracy.

  Moreover, in this invention, when the transition to the said 2nd display attitude | position is detected based on the output of the said geomagnetic sensor, it can also be comprised so that the display of a display part may be reversed 180 degree | times.

  In the present invention, the rotating unit is supported so that a first surface on which the display unit is provided and a second surface which is the opposite surface of the first surface can be reversed, and the rotating unit It is also possible to adopt a configuration in which the reversal operation is detected based on the output of the geomagnetic sensor. In the present invention, both the opening / closing detection and the reversal detection of the rotating portion can be appropriately performed only by the output from the geomagnetic sensor.

  In the present invention, the second closed posture in which the first surface and the second surface of the rotating portion are reversed and the second surface is closed toward the device main body is based on the output of the geomagnetic sensor. Can also be detected. That is, it is possible to distinguish and detect the first closing posture that closes without rotating the rotating portion and the second closing posture that closes in the state where the rotating portion is reversed. Individual control is possible.

  In the present invention, it is preferable that the electronic device is a notebook personal computer. Since the power consumption of the display unit in the notebook personal computer is very large, the power consumption can be effectively reduced by using the configuration of the present invention for the notebook personal computer.

  In the present invention, in the opening / closing detection using the magnetic sensor, no magnet is required by using the triaxial geomagnetic sensor. Further, based on the output of the three-axis geomagnetic sensor, it is possible to detect in which direction the rotating unit is tilted from the first display posture standing on the device main body. And based on the output from a geomagnetic sensor, it is possible to raise the freedom degree of the display control with respect to a display part.

  1 is a perspective view showing a first display posture of a notebook personal computer (electronic device), FIG. 2 is a perspective view showing a first closed posture of the notebook personal computer, and FIG. 3 is a first view of the notebook personal computer. FIG. 4 is a perspective view showing a state in which the first surface and the second surface of the movable part of the notebook personal computer are inverted, and FIG. 5 is a second closed posture of the notebook personal computer. FIG. 6 is a perspective view of a three-axis geomagnetic sensor in the present embodiment built in the movable part of the notebook personal computer, and FIGS. 7 to 9 are three axes at the time of opening / closing operation of the rotating part. FIG. 10 is a flowchart for explaining the power control procedure for the display unit of the present embodiment, and FIG. 11 is a configuration of the geomagnetic sensor. FIG. 12 is a plan view of the magnetoresistive element, FIG. 12 is a diagram for explaining the relationship between the fixed magnetization direction of the fixed magnetic layer and the magnetization direction of the free magnetic layer, and the electric resistance value, and FIG. FIG. 14 is a cross-sectional view showing a cut surface when the element portion constituting the magnetoresistive effect element is cut from the film thickness direction, and FIG. 14 is a circuit diagram of the geomagnetic sensor of the present embodiment.

  The notebook personal computer 20 shown in FIG. 1 is connected via a hinge portion to a rotating portion 22 having a display portion 21 provided on a first surface 22b and a device body 23 having a surface 24a provided with a keyboard 24 and the like. This is the configuration.

  Here, the X-axis direction, the Y-axis direction, and the Z-axis direction in each drawing are orthogonal to each other. The X-axis direction is the longitudinal direction of the notebook personal computer 20, the Y-axis direction is the lateral direction (width direction) of the notebook personal computer 20, and the Z-axis direction is the height direction (thickness) of the notebook personal computer 20. Direction). The X-axis direction is indicated by two directions, ie, the X1 direction and the opposite X2 direction. The X1 direction is the front side of the device main body 23 and is a direction approaching the user of the notebook personal computer 20. The X2 direction is a depth direction of the device main body 23 and is a direction away from the user of the notebook personal computer 20.

  The state of the notebook personal computer 20 shown in FIG. 1 is the first display posture. The first display posture refers to a normal use state of the notebook personal computer 20, where the display unit 21 faces the device main body 23 side and the rotating unit 22 stands up with respect to the device main body 23. In FIG. 1, the rotating unit 22 is orthogonal to the device main body 23, but in order to make the display unit 21 easier to see, the rotating unit 22 may be used obliquely in the X2 direction. The first display posture is also tilted in the X2 direction from the axial direction.

  The turning unit 22 of the notebook personal computer 20 shown in FIG. 1 is supported so as to be rotatable about the Y-axis direction as a turning axis. Therefore, the rotating unit 22 can shift to the first closed posture of FIG. 2 while drawing the arc-shaped locus A from the first display posture of FIG. 1 toward the X1 direction. The first closed posture is a state in which the display unit 21 is closed toward the surface 23 a of the device main body 23. Further, as shown in FIG. 3, the rotating unit 22 can shift to the second display posture of FIG. 3 while drawing an arcuate locus B from the first display posture of FIG. 1 in the X2 direction. The second display posture is a state in which the rotation unit 22 is positioned on the depth side of the device main body 23 and the display unit 21 faces substantially the same direction (Z direction) as the surface 23 a of the device main body 23.

  Further, as shown in FIG. 1, a rotation shaft 25 is provided on the lower surface 22 a of the rotation unit 22 in a direction orthogonal to the center position of the lower surface 22 a, and the first surface 22 b and the first surface 22 b of the rotation unit 22 are provided. The second surface 22c, which is the opposite surface, is supported so as to be reversible around the rotation shaft 25.

  4 shows a state in which the first surface 22b and the second surface 22c of the rotating unit 22 are inverted by 180 ° from the first display posture of FIG. 1 by the rotating shaft 25, and the second surface 22c is on the device main body 23 side. Facing.

The rotating unit 22 can shift from the inverted state of FIG. 4 to the second closed posture of FIG. 4 while drawing an arcuate locus C in the X1 direction. In the second closed position, the display unit 21 does not hide on the device main body 23 side but appears on the surface (upper surface) of the notebook personal computer 20.
As shown in FIG. 1, the rotation unit 22 includes a triaxial geomagnetic sensor 1.

  As shown in FIG. 14, the geomagnetic sensor 1 includes a sensor unit 6 in which magnetoresistive effect elements 2 and 3 and fixed resistance elements 4 and 5 are bridge-connected, an input terminal 7 electrically connected to the sensor unit 6, The integrated circuit (IC) 11 includes a ground terminal 8, a differential amplifier 9, an external output terminal 10, and the like.

  FIG. 11 is a plan view of the magnetoresistive elements 2 and 3 constituting the geomagnetic sensor with the Y-axis direction as the sensitivity axis. As shown in FIG. 11, the magnetoresistive effect elements 2 and 3 include a plurality of element portions 12 each having an element length L1 longer than the element width W1 and elongated in the X direction shown in the figure. The element parts 12 are arranged in parallel at predetermined intervals in the direction, and the end portions of the element parts 12 are electrically connected by the connection electrode parts 13 to form a meander shape. An electrode portion 15 connected to an input terminal 7, a ground terminal 8, and an output extraction portion 14 (see FIG. 14) is connected to one of the element portions 12 at both ends formed in a meander shape. The connection electrode part 13 and the electrode part 15 are nonmagnetic conductive materials, such as Al, Ta, Au.

  Each element part 12 which comprises the magnetoresistive effect elements 2 and 3 is comprised by the same laminated structure shown in FIG. FIG. 13 shows a cut surface cut in the film thickness direction from the direction parallel to the element width W1.

  The element unit 12 is formed by stacking, for example, an antiferromagnetic layer 33, a pinned magnetic layer 34, a nonmagnetic layer 35, and a free magnetic layer 36 in this order from below, and the surface of the free magnetic layer 36 is covered with a protective layer 37. It has been broken. The element part 12 is formed by sputtering, for example.

The antiferromagnetic layer 33 is made of an antiferromagnetic material such as an Ir—Mn alloy (iridium-manganese alloy). The pinned magnetic layer 34 is formed of a soft magnetic material such as a Co—Fe alloy (cobalt-iron alloy). The nonmagnetic layer 35 is made of Cu (copper) or the like. The free magnetic layer 36 is made of a soft magnetic material such as a Ni—Fe alloy (nickel-iron alloy). The protective layer 37 is made of Ta (tantalum) or the like. In the above configuration, the nonmagnetic layer 35 is a giant magnetoresistive effect element (GMR element) formed of a nonmagnetic conductive material such as Cu, but a tunnel type magnetoresistive effect element formed of an insulating material such as Al ₂ O _3. (TMR element) may be used. Further, the stacked configuration of the element unit 12 illustrated in FIG. 13 is an example, and another stacked configuration may be used. For example, the free magnetic layer 36, the nonmagnetic layer 35, the pinned magnetic layer 34, the antiferromagnetic layer 33, and the protective layer 37 may be stacked in this order from the bottom.

  In the element unit 12, the magnetization direction of the pinned magnetic layer 34 is fixed by antiferromagnetic coupling between the antiferromagnetic layer 33 and the pinned magnetic layer 34. As shown in FIGS. 11 and 13, the pinned magnetization direction (P direction) of the pinned magnetic layer 34 faces the element width direction (Y direction).

On the other hand, the magnetization direction (F direction) of the free magnetic layer 36 varies depending on the external magnetic field.
As shown in FIG. 12, when the external magnetic field Y1 acts from the same direction as the fixed magnetization direction (P direction) of the fixed magnetic layer 34 and the magnetization direction (F direction) of the free magnetic layer 36 faces the external magnetic field Y1 direction, The fixed magnetization direction (P direction) of the fixed magnetic layer 34 and the magnetization direction (F direction) of the free magnetic layer 36 approach parallel to each other, and the electric resistance value decreases.

  On the other hand, as shown in FIG. 12, the external magnetic field Y2 acts from the direction opposite to the fixed magnetization direction (P direction) of the fixed magnetic layer 34, and the magnetization direction (F direction) of the free magnetic layer 36 faces the external magnetic field Y2. Then, the fixed magnetization direction (P direction) of the fixed magnetic layer 34 and the magnetization direction (F direction) of the free magnetic layer 36 approach antiparallel, and the electrical resistance value increases.

  The magnetoresistive elements 2 and 3 may be anisotropic magnetoresistive elements (AMR elements) using the anisotropic magnetoresistive effect.

  In the configuration shown in FIG. 11, a soft magnetic body 18 that exhibits a magnetic shielding effect against a disturbance magnetic field from the X direction is provided between the element portions 12 and outside the outermost element portion 12. . The formation of the soft magnetic body 18 is not essential.

  As described above, in the configuration shown in FIG. 11, the Y-axis direction is the sensitivity axis, and is for detecting geomagnetism from a direction parallel to the Y direction.

  As shown in FIG. 6, the geomagnetic sensor 1 in the present embodiment includes an X-axis magnetic field detection unit 50, a Y-axis magnetic field detection unit 51, and a Z-axis magnetic field detection unit 52, and the detection units 50, 51, 52 is provided with a sensor part of the bridge circuit shown in FIG. In the X-axis magnetic field detection unit 50, the fixed magnetization direction (P direction) of the fixed magnetic layer 34 of the element unit 12 of the magnetoresistive effect elements 2 and 3 faces the X direction that is the sensitivity axis, and the Y-axis magnetic field detection unit In 51, the fixed magnetization direction (P direction) of the pinned magnetic layer 34 of the element portion 12 of the magnetoresistive effect elements 2 and 3 faces the Y direction which is the sensitivity axis, and in the Z-axis magnetic field detector 52, the magnetoresistive effect The pinned magnetization direction (P direction) of the pinned magnetic layer 34 of the element portion 12 of the elements 2 and 3 faces the Z direction that is the sensitivity axis.

  The X-axis magnetic field detection unit 50, the Y-axis magnetic field detection unit 51, the Z-axis magnetic field detection unit 52, and the integrated circuit (ASIC) 54 are all provided on the base 53.

  7 shows the output change of the triaxial geomagnetic sensor 1 during the opening / closing operation from the first closed posture of FIG. 2 to the first display posture of FIG. 1 and further to the second display posture of FIG.

  As shown in FIG. 7, since the rotation operation is performed around the Y axis, the output change of the Y axis geomagnetic sensor is minimized. In an arbitrary three-dimensional space, the output value of the three-axis geomagnetic sensor starts to change at the same time by the turning operation. At that time, it is possible to determine from the rate of change (change in sensor output per unit second) whether a predetermined operation is being performed and in which direction.

  For example, the change in sensor output as shown in FIG. 7 is set in advance as a pattern of the opening / closing operation of the rotating unit 22.

  In this embodiment, there is no need to know the direction of the east, west, south, and north with the geomagnetic sensor. However, the magnitude of the sensor output of the X-axis, Y-axis, and Z-axis each time varies depending on the product due to differences in geomagnetism due to different installation positions of the geomagnetic sensor 1 within the movable portion 22 or different usage areas. If changed, it will not be possible to accurately determine what operation the rotating unit 22 is performing from the sensor output. Therefore, a control unit (not shown) performs calibration after the power is turned on, for example. Calibration is performed by calculating from a plurality of sensor output values. In the calibration, the sensor output value is controlled (the sensor output is placed on the virtual sphere and the rate of change of the sensor output is adjusted) so that the sensor output value changes on the surface of the predetermined virtual sphere. . For example, when the movable unit 22 is rotated around the Y axis by this calibration, the sensor outputs of the X axis, the Y axis, and the Z axis change on the surface of the virtual sphere. In the control unit, for example, patterns of sensor output change of the X axis, the Y axis, and the Z axis when the movable unit 22 is rotated around the Y axis are stored in advance. Therefore, when the sensor output change as shown in FIG. 7 is obtained, it can be known that the rotating unit 22 is rotating around the Y axis by comparing with a prestored pattern. Further, the rotation angle and the rotation direction can be known.

  By performing the calibration described above, for example, when the notebook personal computer 20 is held and moved up and down, even if the sensor output change is similar to the rotation operation of the rotation unit, the rotation is performed. It can be determined that an operation other than the rotation operation of the moving unit 22 is performed.

  FIG. 8 shows a rotating unit 22 in which the notebook personal computer 20 is rotated 90 degrees around the Z axis on the XY plane from the installed state of the notebook personal computer 20 that can obtain the sensor output of FIG. Is a sensor output change when is rotated around the Y axis. 9 shows a state in which the notebook personal computer 20 is rotated by 45 degrees around the Z axis on the XY plane from the installation state of the notebook personal computer 20 that can obtain the sensor output of FIG. This is a change in sensor output when the rotating unit 22 is rotated around the Y axis.

  The sensor outputs (change rates) of the X-axis, Y-axis, and Z-axis in FIGS. 7, 8, and 9 all follow substantially the same pattern, regardless of the orientation of the notebook personal computer 20, etc. It can be determined that 22 is rotated around the Y axis.

  Note that calibration is preferably performed at regular intervals each time the power is turned on, more preferably when the power is turned on and after the power is turned on. This is because the magnetic field at power-on and the magnetic field at shutdown may be different.

  Next, the power control procedure of the display unit 21 in this embodiment will be described. The power supply control from the first display posture in FIG. 1 to the first closed posture in FIG. 2 will be described.

  First, as shown in step S <b> 1 of FIG. 10, the measurement accuracy correction called calibration is performed every time the power is turned on.

  Subsequently, the geomagnetism sensor 1 detects the geomagnetism, and the output values of the triaxial component (X, Y, Z) by the triaxial geomagnetic sensor 1 are always acquired at regular intervals (step S2).

  Moreover, it is preferable that the rotation unit 22 incorporates an acceleration sensor. Then, as shown in step S3, operation information is obtained from the acceleration sensor.

  Next, in step S4, it is determined whether the output change of the geomagnetic sensor 1 is other than a predetermined pattern. For example, even when only the uniaxial sensor output changes so much that only the Z axis sensor output changes greatly, or even when the triaxial component or biaxial component changes, they change other than the predetermined pattern. If it is determined that the rotation unit 22 is not performing a predetermined operation, the power control for the display unit 21 is not performed.

  Subsequently, based on the output of the geomagnetic sensor 1, it is determined whether or not the rotating unit 22 is rotating. That is, it is determined whether or not the output of the geomagnetic sensor 1 is an output component change that draws an arcuate locus A in the X1 direction.

  Next, in step S6, when there is no power saving mode, power control for the display unit 21 is not performed even if the above-described rotation operation of the rotation unit 22 is detected.

  In the case of the power saving mode, in step S7, it is determined whether or not the output change of the geomagnetic sensor 1 in the rotation direction of the rotation unit 22 has stopped.

  Further, the operation information from the acceleration sensor is acquired, and in step S8, it is determined whether or not the rotation speed of the rotation unit 22 from the first display posture of FIG. 1 to the first closed posture of FIG. to decide.

  At this time, if the rotation speed is equal to or higher than a predetermined value, for example, the power of the display unit 21 is turned off (step S9). On the other hand, when the rotation speed is equal to or lower than the predetermined value, for example, the mode is shifted to the standby mode in which the set current value of the display unit 21 is lowered to erase the backlight and darken the screen (step S10).

  Further, in the above-described standby mode, when the rotating unit 22 is returned from the first closed state in FIG. 2 to the first display state in FIG. 2, the rotating unit 22 is based on the output from the geomagnetic sensor 1. It can be detected that the device body 23 is opened, and the power mode of the display unit 21 can be returned from the standby mode to the power mode in use by turning on the backlight.

  A case where the first display posture shown in FIG. 1 is shifted to the second display posture shown in FIG. 3 will be described.

  Steps S1 to S4 in FIG. 10 are the same. Next, on the basis of the output change of the three-axis direction components (X, Y, Z) of the geomagnetic sensor 1, the arcuate trajectory B is formed in the X2 direction in which the rotating unit 22 is the depth direction (away direction) of the device main body 23. Whether or not is drawn. When the shift to the second display posture is detected, the screen displayed on the display unit 21 is inverted 180 degrees as shown in FIG. Thereby, the screen can be directed to a person on the depth side (X2 direction) of the device main body 23.

  It is possible to freely set at which point in time it is determined to shift to the second display posture, in other words, at which point the screen of the display unit 21 is reversed. The screen of the display unit 21 may be reversed at the stage of complete transition to the second display posture shown in FIG. 3, or the rotation unit 22 rotates by a predetermined angle or more from the Z-axis direction toward the X2 direction. The screen of the display unit 21 may be reversed when the rotation speed is higher than a predetermined speed from the first display posture of FIG. 1 to the second display posture of FIG. May be reversed.

  In the present embodiment, based on the output of the three-axis geomagnetic sensor 1, the rotation operation of the rotation unit 22 between the first closed posture and the first display posture, and the first display posture and the second display posture. The rotation operation of the rotation unit 22 between the two can be detected. The rotation operation here includes the rotation direction.

  In FIG. 10, the rotation operation of the rotation unit 22 between the first closed posture and the display posture is detected based on the output from the three-axis geomagnetic sensor 1 capable of capturing a change in geomagnetism, and displayed. Power control of the unit 21 can be performed.

  Further, the rotation operation of the rotation unit 22 between the first display posture and the second display posture is detected based on the output from the triaxial geomagnetic sensor 1 capable of capturing a change in geomagnetism, and displayed. Display control such as reversing the screen of the unit 21 by 180 degrees can be performed.

  As described above, in this embodiment using the triaxial geomagnetic sensor 1, unlike the patent document 1, no magnet is required. Therefore, the number of parts can be reduced, and the degree of freedom of arrangement of the geomagnetic sensor 1 can be increased.

  Furthermore, in this embodiment, the degree of freedom of power control for the display unit 21 can be increased by using the output from the geomagnetic sensor 1. That is, in the conventional combination of the magnetic sensor and the magnet, the opening / closing detection cannot be performed unless the magnetic sensor has a distance that can capture the external magnetic field from the magnet. There are no restrictions. In the present embodiment, it is possible to shift to the power saving mode at any rotational position from the first display posture of FIG. 1 to the first closed posture of FIG. Thus, in this embodiment, the switching timing of the power supply mode of the display part 21 can be adjusted freely.

  Further, although the geomagnetic sensor 1 can measure the rotation speed, the detection accuracy can be improved by providing an acceleration sensor. And in this embodiment, as shown to step S8, S9 based on the rotational speed of the rotation part 22 from the 1st display attitude | position of FIG. 1 to the 1st closed attitude | position of FIG. It is possible to switch modes. In the present embodiment, the degree of freedom in switching the power saving mode can be increased with a simple configuration.

  The contents of the power saving mode in steps S8 and S9 are merely examples, and the present invention is not limited to this.

  Next, in the present embodiment, the first surface 22b and the second surface 22c of the rotating unit 22 can be reversed as shown in FIG. 4 from the first display posture of FIG. Detection is possible based on the output of the sensor 1.

  That is, it can be determined from the output locus based on the output change of the three-axis direction components (X, Y, Z) of the geomagnetic sensor 1 whether or not the rotating portion 22 is rotating around the rotating shaft 25.

  As shown in FIG. 4, when the first surface 22b and the second surface 22c of the rotating unit 22 are reversed, display control (switching of screen display, switching of power supply mode, etc.) is performed on the display unit 21. May or may not be done.

  Further, in the present embodiment, the rotation angle around the rotation shaft 25 of the rotation unit 22 can be detected, so that the display control described above can be performed when the rotation unit rotates more than a predetermined amount.

  Next, also when shifting from the state in which the rotating portion 22 shown in FIG. 4 is reversed to the second closed posture in FIG. 5, it is based on the output change of the three-axis direction components (X, Y, Z) of the geomagnetic sensor 1. From the output trajectory, it can be determined that the rotating portion 22 is rotating while drawing an arc-shaped trajectory C in the X1 direction.

  That is, in this embodiment, the transition from the first display posture shown in FIG. 1 to the first closed posture shown in FIG. 2 and the second closed posture shown in FIG. Both of the transitions to can be determined separately, and individual control can be performed for each closed posture.

  In the second closed posture of FIG. 5, the display unit 21 appears on the front side of the notebook personal computer 20. Therefore, as described with reference to FIG. 10, the power saving mode of the display unit 21 may be activated to turn off the power of the display unit 21, or the current power mode may be maintained (no power control is performed). ). Further, since the screen of the display unit 21 is reversed when viewed from a person on the front side (X1 side in the drawing) of the device main body 23, the screen of the display unit 21 is reversed 180 degrees (indicated by an arrow D). It is also possible to perform display control.

  The electronic device of the present embodiment is not limited to a notebook personal computer, and may be a foldable mobile phone or the like. However, since the power consumption of the display unit in the notebook personal computer is very large, the power consumption can be effectively reduced by using the configuration of the present embodiment for the notebook personal computer.

The perspective view which shows the 1st display attitude | position of a notebook personal computer (electronic device), The perspective view which shows the 1st closing attitude | position of a notebook type personal computer, The perspective view which shows the 2nd display attitude | position of a notebook personal computer, The perspective view which shows the state which reversed the 1st surface and 2nd surface of the movable part of a notebook personal computer, The perspective view which shows the 2nd closing posture of a notebook type personal computer, The perspective view of the triaxial geomagnetic sensor in this embodiment incorporated in the movable part of a notebook type personal computer, The figure which shows the output change of a triaxial geomagnetic sensor at the time of opening / closing operation | movement of a rotation part, The figure which shows the output change of a triaxial geomagnetic sensor at the time of the opening / closing operation | movement of a rotation part in the state different from FIG. The figure which shows the output change of a triaxial geomagnetic sensor at the time of the opening / closing operation | movement of a rotation part in the state different from FIG. The flowchart for demonstrating the procedure of the power supply control with respect to the display part of this embodiment, A plan view of a magnetoresistive effect element constituting a geomagnetic sensor, The figure for demonstrating the relationship between the fixed magnetization direction of the fixed magnetic layer of a magnetoresistive effect element, the magnetization direction of a free magnetic layer, and an electrical resistance value, Sectional drawing which shows the cut surface at the time of cut | disconnecting the element part which comprises a magnetoresistive effect element from a film thickness direction, Circuit diagram of the geomagnetic sensor of the present embodiment,

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Geomagnetic sensor 2, 3 Magnetoresistance effect element 4, 5 Fixed resistance element 6 Sensor part 11, 54 Integrated circuit 12 Element part 18 Soft magnetic body 20 Notebook personal computer 21 Display part 22 Turning part 22b 1st surface 22c 2nd Surface 23 Device body 25 Rotating shaft 33 Antiferromagnetic layer 34 Pinned magnetic layer 35 Nonmagnetic layer 36 Free magnetic layer 37 Protective layer 50 X-axis magnetic field detector 51 Y-axis magnetic field detector 52 Z-axis magnetic field detector

Claims (9)

An apparatus main body, and a rotation unit rotatably supported by the apparatus main body, the display unit being provided in the rotation unit, wherein the rotation unit is configured to connect the display unit to the device main body. From the first display posture that is raised and the first closed posture in which the display unit is closed toward the device main body, and from the first display posture and the first display posture, The rotating portion is rotated in a direction opposite to the closed posture, and the display portion is rotatable between a second display posture facing the same direction as the surface of the device body,
The rotating part has a built-in triaxial geomagnetic sensor,
Based on the output of the geomagnetic sensor, the rotation operation of the rotation unit between the first closing posture and the first display posture, and between the first display posture and the second display posture. An electronic device characterized in that it can detect the rotation operation of the rotation unit.   The electronic device according to claim 1, wherein display control of the display unit is performed by detecting a rotation operation of the rotation unit.   The electronic apparatus according to claim 2, wherein a power source control of the display unit is performed by detecting a rotation operation of the rotation unit between the first closing posture and the first display posture.   The electronic device according to claim 3, wherein the power saving mode of the display unit is switched based on a rotation speed from the first display posture to the first closed posture.   The electronic device according to claim 4, wherein an acceleration sensor is built in the rotating unit.   4. The electronic device according to claim 1, wherein when the transition to the second display posture is detected based on an output of the geomagnetic sensor, the display of the display unit is inverted 180 degrees.   The rotating unit is supported so that a first surface on which the display unit is provided and a second surface which is the opposite surface of the first surface are reversible, and the reversing operation of the rotating unit is The electronic device according to claim 1, wherein the electronic device is detected based on an output of a geomagnetic sensor.   The second closing posture in which the first surface and the second surface of the rotating portion are reversed and the second surface is closed toward the device main body is detected based on the output of the geomagnetic sensor. 7. The electronic device according to 7.   The electronic device according to claim 1, wherein the electronic device is a notebook personal computer.

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