JP2020074509A - Electronic apparatus - Google Patents

Abstract

To magnetically detect opening and closing of a movable part without increasing size and to facilitate the design of an opening and closing detection angle in an electronic device that is provided with a movable part.SOLUTION: An imaging apparatus includes a movable part 40 whose display part can be rotated in an opening and closing direction with respect to an apparatus body by a hinge part 43. A magnet 52 is located in the vicinity of the hinge part 43, and an opening and closing sensor 50 detects opening and closing of the movable part 40 by detecting a magnetic field of the magnet 52. The magnetization direction of the magnet 52 is a direction perpendicular to the opening and closing axis 45 of the movable part 40, the opening and closing sensor 50 detects a magnetic field in a direction perpendicular to the opening and closing axis 45, and a control section acquires a detection signal of the opening and closing sensor 50 to control the display state of the display part 41.SELECTED DRAWING: Figure 3

Description

  The present invention relates to an electronic device including a movable part.

  2. Description of the Related Art Conventionally, there are devices such as digital cameras and video cameras that have a display unit that can be opened / closed and rotated with respect to a device body. Depending on the open / closed state or the rotated state of the display unit, up / down and left / right inversion processing of the image displayed on the display unit and switching processing of lighting and extinguishing are performed. A magnet and a magnetic sensor are used to detect the opening / closing or rotation of the display unit. The reason is that space can be saved and reliability is improved by non-contact. Patent Document 1 discloses a device that switches a display state of a display unit by using a magnetic sensor for detecting opening / closing and rotation.

JP, 2012-42743, A

In the conventional technique disclosed in Patent Document 1, when the design of the detection angle of the display unit is changed, it is difficult to intuitively understand which parameter should be changed to obtain the desired angle, and the simulation is repeated. Therefore, it was necessary to redesign to a desired detection angle. In addition, in order to achieve a desired detection angle, it may be necessary to increase the outer size.
It is an object of the present invention to magnetically detect the opening / closing of a movable part without increasing the size of the electronic device having the movable part, and to facilitate the design of the opening / closing detection angle.

  An electronic device according to the present invention includes a main body section, a movable section, a biaxial rotation section that connects the main body section and the movable section, a magnetic field generation section arranged in the movable section, and a magnetic field generation section arranged in the main body section. A first magnetic sensor that detects a magnetic field generated by the magnetic field generation unit and outputs a signal; and a second magnetic sensor that is disposed in the main body unit and that detects a magnetic field generated by the magnetic field generation unit and outputs a signal. Magnetic sensor of. The biaxial rotation unit has a first axis and a second axis orthogonal to the first axis, and the magnetic field generation unit generates a magnetic field orthogonal to the direction of the first axis. , The first magnetic sensor is arranged to detect a magnetic field in a direction of the first axis, and the second magnetic sensor detects a magnetic field in a direction orthogonal to the first axis. It is arranged. The first magnetic sensor and the second magnetic sensor are arranged side by side in the direction of the first axis, and in the first state in which the movable portion is housed in the main body portion, the first magnetic sensor is disposed. The sensor and the second magnetic sensor are at positions where the magnetic field generated by the magnetic field generation unit cannot be detected, and the movable unit is rotated from the first state about the first axis to move the movable unit. In the second state in which the first magnetic sensor and the second magnetic sensor are projected from the main body section, the first magnetic sensor and the second magnetic sensor are in positions where the magnetic field generated by the magnetic field generation section cannot be detected, In the third state in which the movable portion is rotated about the second axis, the first magnetic sensor is at a position where the magnetic field generated by the magnetic field generating portion can be detected, The first axis Examples heart by rotating the movable portion, in a fourth state in which the movable part is accommodated in the main body portion, said second magnetic sensor is in a position capable of detecting a magnetic field the magnetic field generating unit is generating. The transition from the second state to the third state is detected by a change in the output of the first magnetic sensor, and the transition from the third state to the fourth state is performed by the second state. It is detected by a change in the output of the magnetic sensor.

  According to the present invention, it is possible to magnetically detect the opening / closing of the movable part without increasing the size of the electronic device having the movable part, and it is possible to easily design the opening / closing detection angle of the movable part.

It is a perspective view showing the appearance of the imaging device concerning the embodiment of the present invention. It is a perspective view which shows the imaging device in the state which opened the movable display device of FIG. It is a figure which shows operation | movement of the movable display device of FIG. 1, and arrangement | positioning of each sensor and a magnet. FIG. 4 is a diagram showing a display state in each operation of the movable display device of FIG. 3. It is a block diagram which shows the structural example of the imaging device of this embodiment. It is a rear view of the imaging device of this embodiment. It is a figure which shows the detail of arrangement | positioning of the opening / closing sensor of this embodiment, a rotation sensor, and a magnet. It is a figure which shows the relationship between operation | movement of the movable display device of this embodiment, and the magnetic flux density which each sensor detects. It is a figure explaining the imaging device which concerns on a modification.

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings.
FIG. 1 is an external view showing an image pickup apparatus such as a digital camera as an example of an electronic apparatus according to an embodiment of the present invention. FIG. 1A is a perspective view of the image pickup apparatus 100 as viewed from the front side, and FIG. 1B is a perspective view of the image pickup apparatus 100 as viewed from the rear side. In FIG. 1A, the device body of the image pickup apparatus 100 is shown with the detachable taking lens device removed. Note that the subject side is defined as the front side, and the positional relationship of each part will be described. The imaging device 100 includes a movable display device (hereinafter referred to as a movable unit) 40. FIG. 2 is a perspective view showing the movable section 40 in the open state on the back surface of the image pickup apparatus 100.

  The shutter button 61 shown in FIG. 1A is an operation member that constitutes an operation unit for the user to issue a shooting instruction. The mode changeover switch 60 is an operation member for changing over between various modes. The terminal cover 91 located on the side surface of the image pickup apparatus 100 protects a connector (not shown) such as a connection cable connecting the external device and the image pickup apparatus 100. The main electronic dial 71 is a rotation operation member provided on the upper surface of the grip 90. By rotating the main electronic dial 71, the user can change various setting values including the shutter speed and the aperture value.

  The power switch 72 shown in FIG. 1B is an operation member used when the user switches the power of the imaging device 100 on and off. The sub electronic dial 73 is a rotary operation member located on the back surface of the image pickup apparatus 100, and is used when the user performs operations such as moving the selection frame and moving an image. The SET button 75 is a push button, and is mainly used for determining a selection item. The multi-controller 76 can be tilted up, down, left, and right and can be operated in each direction. The enlargement button 77 is an operation button used when the user performs an ON or OFF operation of the enlargement mode and changes the enlargement ratio during the enlargement mode in the live view (hereinafter also referred to as LV) display in the shooting mode. .. The enlargement button 77 enlarges the reproduced image in the reproduction mode and functions as an enlargement button for increasing the enlargement ratio. The playback button 78 is an operation button used when the user switches between the shooting mode and the playback mode. When the user presses the play button 78 during the shooting mode, the mode is changed to the play mode. The LV lever 92 is an operation member used when the user switches between the still image shooting mode and the moving image shooting mode. The LV button 93 is an operation member used when the user switches the live view display ON and OFF in the still image shooting mode. In the moving image shooting mode, the LV button 93 is used to instruct start and stop of moving image shooting (recording).

  The quick return mirror 12 shown in FIG. 1 (A) is a movable optical member provided inside the device body, and is rotated by an actuator (not shown) instructed by the system controller (reference numeral 30 in FIG. 5). Be moved. The communication terminal 10 is a communication terminal for communicating between the taking lens device and the apparatus main body in a state where the taking lens device (not shown) is attached to the imaging device 100. The eyepiece finder 16 shown in FIG. 1 (B) is a peep-on type finder for allowing the user to observe the focusing screen (not shown) to confirm the focus state and composition of the subject image through the lens unit. A lid 202 arranged on the side surface of the device body is an opening / closing lid for a slot for attaching / detaching a recording medium. The grip part 90 is a grip part having a shape that allows a user to easily grip it with the right hand when holding the imaging device 100.

  As shown in FIG. 2, the movable section 40 includes an LCD (liquid crystal display) panel 41. The movable portion 40 is attached to the device body by a biaxial rotation mechanism. That is, the movable portion 40 is supported by the hinge portion 43 so as to be rotatable in the left and right opening and closing directions about the opening and closing shaft 45, and rotatably in the rotating direction about the rotation shaft 46. In FIG. 2, the longitudinal direction of the LCD panel 41, which is the display unit, is the horizontal direction, and the direction of the opening / closing shaft 45 is the vertical direction. The rotary shaft 46 is a shaft extending in a direction orthogonal to the opening / closing shaft 45 (longitudinal direction of the LCD panel 41).

  The storage surface portion 44 is a portion where the movable portion 40 faces the device main body portion during storage, and is a concave bottom portion provided on the rear cover 19 in the open state. The back cover 19 is provided with locking claws 47 and can be locked when the movable portion 40 is housed in the back cover 19. The storage surface portion 44 includes an elastic member 48. When the movable portion 40 is in the closed state and is locked by the locking claw 47, the elastic member 48 is in the compressed state and urges the movable portion 40 to the locking claw 47. Thereafter, with respect to the open / close and rotation states of the movable portion 40, the state in which the storage surface portion 44 and the LCD panel 41 are stored facing each other (see FIG. 1B) is referred to as an opening / closing angle 0 ° and a rotation angle 0 °. The upper limit value of the opening / closing angle is 175 °, and the rotation angle range is up to 180 ° in the + direction and up to 90 ° in the − direction shown in FIG.

  FIG. 3 is a perspective view showing different states when the movable portion 40 is opened and closed. FIG. 4 shows the state of the display screen of the LCD panel 41 during LV shooting in each state shown in FIG. An opening / closing sensor 50 and a rotation sensor 51 that detect the operating state of the movable portion 40 are arranged inside the device body. The open / close sensor 50 detects opening / closing of the movable portion 40, and the rotation sensor 51 detects rotation of the movable portion 40. In FIG. 3, the movable part 40 and a part of the device body are shown in a see-through state. Giant magnetoresistive (GMR) elements that detect a magnetic field parallel to the mounting surface are used for the open / close sensor 50 and the rotation sensor 51. Further, a magnet 52 for reacting the sensors (50, 51) is arranged inside the movable portion 40. The magnet 52 provided for generating the magnetic field is arranged near the end on the hinge portion 43 side in the longitudinal direction of the movable portion 40.

  FIG. 3A is a perspective view showing a closed state of the movable portion 40, showing a state where the opening / closing angle is 0 ° and the rotation angle is 0 °. In the movable portion 40 in this state, the LCD panel 41 is stored so as to face the storage surface portion 44. When the closed state is detected by the close detection sensor (reference numeral 31 in FIG. 5), the LCD panel 41 is turned off under the control of the system control unit (reference numeral 30 in FIG. 5). In this state, when the user opens the movable portion 40 around the opening / closing shaft 45, the closed state detection by the close detection sensor is turned off at a predetermined angle. At this time, the LCD panel 41 is turned on under the control of the system controller.

  FIG. 3B is a perspective view showing an open state of the movable portion 40, showing an open / close angle of 175 ° and a rotation angle of 0 °. This state is a state in which the movable portion 40 is fully opened around the open / close shaft 45, and the display state of the LCD panel 41 at this time is hereinafter referred to as normal display. FIG. 4A shows a normal display LCD panel 41. When the user rotates the movable portion 40 in the + direction around the rotation shaft 46 from the state of FIG. 3B, the open / close sensor 50 and the rotation sensor 51 detect the magnetic field of the magnet 52 at a predetermined angle. After that, when the user further rotates the movable section 40 in the + direction, the state shown in FIG.

  FIG. 3C is a perspective view showing a state where the display surface faces the front side when the movable portion 40 is in an open state, and shows a state where the opening / closing angle is 175 ° and the rotation angle is + 180 °. In this state, the movable portion 40 is rotated by + 180 ° about the rotation shaft 46. The open / close sensor 50 and the rotation sensor 51 detect the magnetic field of the magnet 52, and the display state of the LCD panel 41 is shown from the front side in FIG. 4 (B). The display of the LCD panel 41 is controlled by the system control unit and turned upside down from the normal display (mirror image display from the photographer's perspective), which is suitable for the photographer to take a self-portrait. When the user closes the movable portion 40 around the opening / closing shaft 45 from the state of FIG. 3C, the opening / closing sensor 50 does not detect the magnetic field of the magnet 52 at a predetermined angle, and only the rotation sensor 51 detects the magnetic field of the magnet 52. Is being detected. After that, when the user further closes the movable portion 40, the state shown in FIG.

  FIG. 3D is a perspective view showing a state where the display surface faces rearward when the movable portion 40 is closed, and shows a state where the opening / closing angle is 0 ° and the rotation angle is + 180 °. In this state, the LCD panel 41 of the movable section 40 is stored in the recess of the back cover 19 so that the photographer can see it, and only the rotation sensor 51 detects the magnetic field of the magnet 52. The display state of the LCD panel 41 at this time is shown in FIG. The display of the LCD panel 41 is controlled by the system control unit, and the display is vertically and horizontally reversed from the normal display. The electronic device has an appearance and a feeling of use similar to those of an electronic device that does not include the movable portion 40 and has a display device attached to the back surface.

  Next, the main part of the configuration of the imaging device 100 will be described with reference to FIG. FIG. 5 is a block diagram relating to display control of the LCD panel 41. The system control unit 30 controls the entire image pickup apparatus 100 and controls image display and image pickup operation. The operation unit 32 includes a shutter button 61, a main electronic dial 71, and the like, and includes various operation members as an input unit that receives an operation from a user. A control program or the like is stored in the memory 33, and the system control unit 30 uses the program or data. The close detection sensor 31, the open / close sensor 50, and the rotation sensor 51 output respective detection signals to the system control unit 30. The system control unit 30 acquires the detection signal output from each sensor and controls the display of the LCD panel 41.

  The arrangement of the open / close sensor 50, the rotation sensor 51, and the magnet 52 will be described in detail with reference to FIGS. 6 and 7. FIG. 6 is a diagram of the imaging device 100 in the state of FIG. 3D as viewed from the back side. In this state, the longitudinal direction of the rectangular display screen is defined as the X-axis direction. The direction orthogonal to the X-axis direction in the plane of FIG. 6 is defined as the Y-axis direction, and the direction orthogonal to the plane of the paper is defined as the Z-axis direction. FIG. 7A is a detailed view of the range 101 shown in FIG. 6, and is an enlarged view of a portion other than the periphery of the opening / closing sensor 50, the rotation sensor 51, and the magnet 52 in a state not shown. In FIG. 7A, the horizontal direction is the X-axis direction, and the vertical direction is the Y-axis direction. Further, FIG. 7B is a cross-sectional view taken along the line AA in FIG. In FIG. 7B, the horizontal direction is the X-axis direction, and the vertical direction is the Z-axis direction. FIG. 7C is a perspective view, and the directions of the X axis, Y axis, and Z axis are as illustrated.

  As shown in FIG. 6, the opening / closing sensor 50 and the rotation sensor 51 are arranged on the opening / closing shaft and detect the magnetic field of the magnet 52, respectively. In FIG. 7A, the magnet 52 has an N pole on the left side and an S pole on the right side, and is arranged so as to have a magnetization direction in the X-axis direction. The open / close sensor 50 and the magnet 52 are arranged on the same plane perpendicular to the open / close shaft 45.

  The open / close sensor 50 and the rotation sensor 51 are mounted on an FPC (flexible printed circuit board) 53. The FPC 53 is attached to the resin component 54 with double-sided tape. As shown in FIG. 7B, the mounting surface and the attachment surface of the opening / closing sensor 50 in the resin component 54 are inclined (see angle θ) with respect to the XY plane. That is, the open / close sensor 50 is attached in an inclined state, and the angle θ indicates an angle formed by the mounting surface and the attachment surface of the open / close sensor 50 with respect to the X-axis direction when viewed from the Y-axis direction. As shown by the direction of arrow 55 in FIG. 7B, the opening / closing sensor 50 is arranged so as to detect a magnetic field in a direction having a predetermined inclination angle θ in the XZ plane. That is, the opening / closing sensor 50 can detect a magnetic field parallel to the mounting surface. The rotation sensor 51 is arranged so as to detect a magnetic field in the direction parallel to the mounting surface and the opening / closing shaft 45 (Y-axis direction), as indicated by the arrow 56 in FIG. 7A.

  The measurement centers for magnetic field detection of the open / close sensor 50 and the rotation sensor 51 are both arranged on the open / close shaft 45 of the movable portion 40. The distance from the measurement center of the magnetic field detection of the opening / closing sensor 50 to the rotating shaft 46 of the movable portion 40 and the distance from the center of the magnet 52 to the rotating shaft 46 of the movable portion 40 are equal or substantially the same. The reason is that the open / close sensor 50 detects the magnetic field from the magnet 52 more strongly. Further, in this arrangement, the position of the rotation sensor 51 is a position where the measurement center of magnetic field detection is the position where the magnetic field from the magnet 52 is most strongly received on the opening / closing shaft 45, and the position is displaced from the opening / closing sensor 50 by a predetermined distance. is there.

Next, the relationship between the movement of the movable portion 40 and the magnetic flux density detected by each sensor will be described with reference to FIG.
FIG. 8A illustrates a change in magnetic flux density detected by the rotation sensor 51 when the movable portion 40 is moved from the state of FIG. 3B to the state of FIG. 3C. The horizontal axis represents the rotation angle (unit: degree) of the movable portion 40, and the vertical axis represents the magnetic flux density (unit: mT) detected by the rotation sensor 51. FIG. 8A also shows the threshold value for detecting the magnetic flux density of the rotation sensor 51. When the threshold value is exceeded, ON detection is performed, and when the threshold value is less than the threshold, OFF detection is performed.

  When shifting from the state of FIG. 3 (B) to the state of FIG. 3 (C), the opening / closing angle is fixed at 175 °, and the rotation angle changes from 0 ° to + 180 °. In this case, since the magnetic flux density due to the magnet 52 exceeds the threshold value of the rotation sensor 51 near the rotation angle of 165 °, the rotation sensor 51 outputs an ON signal. On the other hand, when the movable portion 40 is rotated in the opposite direction, the rotation angle changes from 0 ° to −90 °, but since the magnetic flux density by the magnet 52 does not exceed the threshold value of the rotation sensor 51, it rotates. The sensor 51 outputs an OFF signal.

  FIG. 8B illustrates a change in magnetic flux density detected by the opening / closing sensor 50 when the movable portion 40 is moved from the state of FIG. 3D to the state of FIG. 3C. The horizontal axis represents the opening / closing angle (unit: degree) of the movable portion 40, and the vertical axis represents the magnetic flux density (unit: mT) detected by the opening / closing sensor 50. FIG. 8B also shows a threshold value for detecting the magnetic flux density of the opening / closing sensor 50. When the threshold value is not less than the threshold value, the OFF detection is performed, and when the threshold value is less than the threshold value, the ON detection is performed.

  At the time of transition from the state of FIG. 3 (D) to the state of FIG. 3 (C), the rotation angle is fixed at + 180 °, and the opening / closing angle changes from 0 ° to 175 °. In this case, the magnetic flux density due to the magnet 52 becomes less than the threshold value of the open / close sensor 50 when the open / close angle is around 163 °, so the open / close sensor 50 outputs an ON signal. When it is desired to change the value of the opening / closing detection angle, the mounting inclination of the opening / closing sensor 50 (angle θ in FIG. 7B) may be changed. For example, when it is desired to change the value of the open / closed detection angle from about 163 ° to about 170 °, the inclination angle θ of the resin component 54 shown in FIG. 7B is changed to increase. In this case, the magnetic field detection direction may be rotated about 7 ° in the XZ plane without changing the measurement center position of the opening / closing sensor 50. Therefore, it is not necessary to perform a simulation or the like when changing the opening / closing detection angle to a desired angle, and intuitive and easy design is possible. Further, according to this configuration, the position of the opening / closing sensor 50 can be changed without changing the position of the opening / closing sensor 50. Therefore, for example, the exterior portion is not affected and the size of the device is not increased. ..

  FIG. 8C illustrates a change in the magnetic flux density detected by the rotation sensor 51 when the movable portion 40 is moved from the state of FIG. 3D to the state of FIG. 3C. The horizontal axis represents the opening / closing angle (unit: degree) of the movable portion 40, and the vertical axis represents the magnetic flux density (unit: mT) detected by the rotation sensor 51. FIG. 8C also shows the threshold value for detecting the magnetic flux density of the rotation sensor 51. When the threshold value is exceeded, the ON detection is performed, and when the threshold value is less than the threshold, the OFF detection is performed.

At the time of transition from the state of FIG. 3 (D) to the state of FIG. 3 (C), the rotation angle is fixed at + 180 °, and the opening / closing angle changes from 0 ° to 175 °. As shown in FIG. 8C, since the magnetic flux density of the magnet 52 always exceeds the threshold value of the rotation sensor 51, the rotation sensor 51 outputs an ON signal. This is because the magnet 52 and the rotation sensor 51 are arranged so that the relationship between the magnetization direction of the magnet 52 and the magnetic field detection direction of the rotation sensor 51 does not change when the movable portion 40 is opened or closed.
When the state of FIG. 3 (A) is changed to the state of FIG. 3 (B), the magnet 52 and the two sensors (50, 51) operate while keeping a sufficient distance. , Each sensor does not detect the magnetic flux density exceeding the threshold value.

Table 1 shows the detection state of each sensor and the display state of the LCD panel 41 at that time.

  When the movable portion 40 is in the state shown in FIG. 3A, the LCD panel 41 is in the off state due to the detection of the closing detection sensor 31, and the open / close sensor 50 and the rotation sensor 51 are both in the OFF detection state as described above. When the movable portion 40 is in the state shown in FIG. 3B, the LCD panel 41 is in the normal display state, and as described above, the open / close sensor 50 and the rotation sensor 51 are both in the OFF detection state. The system control unit 30 controls the LCD panel 41 to normally display an image captured by the image sensor.

  Under the control of the system control unit 30, the LCD panel 41 displays the image captured by the image sensor in a vertically inverted state under the control of the system control unit 30 when the movable unit 40 is in the state of FIG. In this state, the display is suitable for the photographer to take a self-portrait, and as described above, both the open / close sensor 50 and the rotation sensor 51 are in the ON detection state.

  With the movable unit 40 in the state of FIG. 3D, the LCD panel 41 displays an image captured by the image sensor in a vertically and horizontally inverted state under the control of the system control unit 30. That is, the external appearance and the feeling of use are the same as those of an electronic device that does not include the movable portion 40 and has a display device attached to the back surface. In this case, as described above, the open / close sensor 50 is in the OFF detection state and the rotation sensor 51 is in the ON detection state. Note that Table 1 does not describe the case where the open / close sensor 50 is in the ON detection state and the rotation sensor 51 is in the OFF detection state. In this case, the LCD panel 41 of the movable section 40 is a normal display.

  As described above, according to the present embodiment, when detecting the operation state of the movable portion 40, the opening / closing detection angle by the opening / closing sensor 50 can be intuitively and easily changed by devising the layout of the opening / closing sensor 50 and the magnet 52. is there. Therefore, it is possible to easily design the opening / closing detection angle of the display unit using the magnetic sensor without increasing the size of the electronic device. Further, according to the present embodiment, the magnet 52 for the opening / closing sensor 50 and the rotation sensor 51 can be commonly used. In this example, the arrangement example in which the detection angle of the opening / closing sensor 50 is set for the state where the opening / closing angle of the movable portion 40 is 175 ° and the rotation angle is 180 ° is shown, but the present invention is not limited to this. A modified example will be described below.

[Modification]
FIG. 9 illustrates an imaging device according to a modification. FIG. 9A is a rear view of the image pickup apparatus, and shows the magnet 52 in the movable portion 40 in a see-through state. In this state, the longitudinal direction of the movable section 40 is defined as the X-axis direction. The direction orthogonal to the X-axis direction in the paper surface of FIG. 9A is defined as the Y-axis direction, and the direction orthogonal to the paper surface is defined as the Z-axis direction. FIG. 9B is an enlarged view showing a range 102 shown in FIG. 9A in a state not shown except for the periphery of the opening / closing sensor 50 and the magnet 52. The horizontal direction in FIG. 9B is the X-axis direction, and the vertical direction is the Y-axis direction. FIG. 9C is a cross-sectional view taken along the line BB shown in FIG. 9B, where the horizontal direction is the X-axis direction and the vertical direction is the Z-axis direction.

In the modification, the open / close sensor 50 and the magnet 52 are arranged close to each other when the movable portion 40 has an open / close angle of 0 ° and a rotation angle of 0 °. Further, in FIG. 9B, the magnet 52 is arranged so that the left side has an N pole and the right side has an S pole, and the magnetizing direction is in the X-axis direction. The open / close sensor 50 has a magnetic field detection center located on the open / close shaft 45. As shown by the direction of arrow 56 in FIG. 9C, the opening / closing sensor 50 is arranged so as to detect a magnetic field in a direction having a predetermined angle ω in the XZ plane. The angle ω indicates an angle formed by the mounting surface and the attachment surface of the opening / closing sensor 50 with respect to the X-axis direction when viewed from the Y-axis direction, and is an obtuse angle in this example. In this configuration, for example, it is assumed that the opening / closing angle is 10 ° or less and the magnetic flux density of the magnet 52 exceeds the threshold value of the opening / closing sensor 50. The open / close sensor 50 is in the ON detection state when the open / close angle is 0 ° and the rotation angle is 0 °. When the opening / closing angle exceeds 10 °, the opening / closing sensor 50 enters the OFF detection state. When the open / close sensor 50 detects ON, the system control unit 30 determines that the movable unit 40 is closed, and controls the LCD panel 41 to turn off. Even in this case, the opening / closing detection angle can be easily changed only by rotating the magnetic field detection direction of the opening / closing sensor 50 in the XZ plane.
Although the preferred embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and various modifications and changes can be made within the scope of the gist thereof.

30: system control unit 40: movable unit (movable display device)
41: LCD panel 43: Hinge part 45: Open / close shaft 50: Open / close sensor 51: Rotation sensor 52: Magnet

Claims (4)

Body part,
A moving part,
A biaxial rotating portion that connects the main body portion and the movable portion,
A magnetic field generator arranged in the movable part,
A first magnetic sensor that is disposed in the main body, detects a magnetic field generated by the magnetic field generator, and outputs a signal;
A second magnetic sensor that is disposed in the main body, detects a magnetic field generated by the magnetic field generator, and outputs a signal;
The biaxial rotation unit has a first axis and a second axis orthogonal to the first axis,
The magnetic field generation unit generates a magnetic field orthogonal to the direction of the first axis,
The first magnetic sensor is arranged to detect a magnetic field in the direction of the first axis;
The second magnetic sensor is arranged to detect a magnetic field in a direction orthogonal to the first axis,
The first magnetic sensor and the second magnetic sensor are arranged side by side in the direction of the first axis,
In a first state in which the movable section is housed in the main body section, the first magnetic sensor and the second magnetic sensor are in positions where the magnetic field generated by the magnetic field generation section cannot be detected,
In the second state in which the movable portion is rotated from the first state about the first axis and the movable portion is projected from the main body portion, the first magnetic sensor and the second magnetic The sensor is located at a position where the magnetic field generated by the magnetic field generator cannot be detected,
In a third state in which the movable portion is rotated about the second axis from the second state, the first magnetic sensor is in a position capable of detecting a magnetic field generated by the magnetic field generating section,
In a fourth state in which the movable portion is rotated from the third state about the first axis and the movable portion is housed in the main body portion, the second magnetic sensor causes the magnetic field generation portion to operate. Is at a position where the magnetic field generated by
The transition from the second state to the third state is detected by a change in the output of the first magnetic sensor,
The transition from the third state to the fourth state is detected by a change in the output of the second magnetic sensor. When the movable portion is rotated about the first axis at the time of transition from the fourth state to the third state, the output of the first magnetic sensor does not change, and the second magnetic sensor does not change. The electronic device according to claim 1, wherein the output of the magnetic sensor changes. The second magnetic sensor cannot detect a change in the magnetic field in the direction of the first axis,
The first magnetic sensor cannot detect a change in the magnetic field in the direction of the second axis,
The electronic device according to claim 1 or 2, wherein, in the third state, both the first and second magnetic sensors can detect a magnetic field generated by the magnetic field generation unit. The said 1st magnetic sensor and the said 2nd magnetic sensor are arrange | positioned on the said 1st axis | shaft. The electronic device of any one of Claim 1 to 3 characterized by the above-mentioned.

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