JP2005172723A - Rotation detection mechanism and device with image display part - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To detect the rotation state of an image display part simply and highly accurately at low cost. <P>SOLUTION: The image display part 24 is supported rotatably by a device body 12 through the first hinge shaft 16, a link member 18 and the second hinge shaft 22. A magnet 20 is arranged in the link member 18 which is a member on the device body 12 side across the second hinge shaft 22 to the image display part 24. A circuit board 28 for operating a liquid crystal screen 26 is built in the image display part 24, and a sensitive part 30A of a spin valve type GMR element 30 capable of sensing the change of a magnetic flux direction is installed in the parallel attitude to the circuit board 28 on a part little to the link member 18 of the circuit substrate 28. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a rotation detection mechanism in which an apparatus main body is rotatably supported via a hinge shaft and an apparatus with an image display section, and more particularly to an image display such as a video camera recorder, a digital still camera, a PDA, and a mobile phone. It is suitable for a device with a part.

  2. Description of the Related Art Recent image recording / reproducing apparatuses such as video camera recorders have a structure having a movable image display unit supported so as to be openable and closable and rotatable with respect to the apparatus body. That is, the movable image display unit can be opened, closed, and rotated by changing the tilt angle with respect to the apparatus main body by two hinge shafts. For this reason, the tilt of the image display unit can be adjusted to a convenient angle according to the shooting conditions such as normal shooting, high angle shooting, low angle shooting, and face-to-face shooting. The user's convenience is achieved by turning the image inside the section upside down.

  Therefore, in the case of face-to-face shooting, it is necessary to detect the tilt angle of the image display unit and to flip the image in the image display unit upside down. However, conventional detection for detecting the tilt angle of the image display unit is necessary. As a mechanism, for example, a mechanism using a contact type switch described in Patent Document 1 exists. This contact-type switch is arranged around the rotation shaft in the hinge mechanism, and as the image display section tilts around the rotation shaft, the contact of this contact-type switch is caused by a convex portion provided at a predetermined position of the rotation shaft. This Patent Document 1 has a structure in which an image inversion instruction signal is output from the contact type switch when closed.

On the other hand, Patent Document 2 discloses a detection mechanism that uses a Hall element or MR element (magnetoresistance element) instead of a contact switch. And although there is no specific description of how to realize the image reversal of the image display unit in the publication of Patent Document 2, the Hall element is installed at the position where the mechanical position detection switch is provided, By arranging a magnet on the upper surface of the image display unit, the presence or absence of magnetism is sensed by this Hall element.
JP 2003-51970 A JP-A-10-191131

  However, there are some problems in reversing the image by detecting the tilt of the image display unit using a mechanical contact switch provided in the hinge mechanism of Patent Document 1. That is, first, contact wear occurs in the contact type switch, so that the durability is low. Second, despite the space in the narrow hinge mechanism, high positional accuracy is required for mounting the contact type switch. Since an expensive flexible substrate (hereinafter referred to as FPC) or the like is used to take out the signal line of the contact type switch from the hinge mechanism, the assembly cost becomes high.

  On the other hand, the Hall element of Patent Document 2 not only has a drawback of low sensitivity, but because this Hall element is an element that feels in principle a perpendicular magnetic field, this Hall element is in the direction of the NS magnetic pole of the bias magnet. Must be installed vertically. In other words, the Hall element cannot be attached to the circuit board installed in parallel with the liquid crystal screen of the image display unit, and it is necessary to provide a separate substrate for attaching the Hall element. It must be attached to another substrate with positional accuracy, which also increases the assembly cost.

On the other hand, since the MR element exemplified in Patent Document 2 is a magnetic field strength-dependent element whose characteristics are shown in the graph of FIG. 12, when the gap between the magnet and the MR element becomes large, the image display unit rotates. Accordingly, the amount of magnetic change detected becomes small. As a result, the resistance change amount of the MR element is also reduced. As a result, the MR element cannot provide a sufficient margin for sensitivity with respect to the positional accuracy at the time of mounting and the temperature change of the surrounding environment. There is. Therefore, the MR element cannot reliably detect the rotation state of the image display unit at low cost.
In consideration of the above-described facts, an object of the present invention is to provide a rotation detection mechanism and an image display unit-equipped device that can easily and accurately detect a rotation state associated with a rotation operation of an image display unit at low cost.

The rotation detection mechanism according to claim 1 is a rotation detection mechanism used in a structure in which an image display unit that displays an image is rotatably supported by a device body via a hinge shaft.
A magnetic field generating member that generates an external magnetic field is arranged on the apparatus main body side or on the hinge shaft,
A magnetization direction sensitive element that can be sensitive to changes in the magnetic flux direction is arranged on the image display unit side or the apparatus main body side,
The rotation direction of the image display unit with respect to the apparatus main body is detected by a magnetization direction sensitive element.

  The rotation detection mechanism according to claim 1 is used for a structure in which an image display unit for displaying an image is rotatably supported by the apparatus main body via a hinge shaft. As the image display unit rotates with respect to the apparatus main body, the change in the magnetic flux direction in the external magnetic field generated by the magnetic field generating member disposed on the apparatus main body side or on the hinge shaft is changed to the image display unit side or the apparatus main body. The magnetization direction sensitive element arranged on the side senses, so that the rotation state of the image display unit with respect to the apparatus main body is detected by the magnetization direction sensitive element.

  Therefore, in this claim, since the mechanical contact type switch is not used, the rotation state of the image display unit can be detected by the magnetization direction sensitive element which is a non-contact type switch. There is no failure due to, and durability is increased. Accordingly, special processing such as providing a convex portion on the rotating shaft in the hinge mechanism as in Patent Document 1 is not necessary, and the positional accuracy between the convex portion of the rotating shaft and the contact type switch is increased. No special structure is required for maintenance. In other words, in this claim, since the magnetization direction sensitive element is sensitive to changes in the magnetic flux direction of the external magnetic field generated by the magnetic field generating member, the accuracy of attaching the magnetization direction sensitive element and the magnetic field generating member may be lowered, resulting in a result. As a result, the assembly cost of the rotation detection mechanism according to the present claims is reduced.

  On the other hand, in the present claim, since the Hall element that is sensitive to the external magnetic field vector perpendicular to the element main surface is not used and the magnetization direction sensitive element that can be sensitive to the change of the magnetic flux direction as described above is employed, for example, an image This magnetization direction sensitive element can be attached in a posture parallel to the circuit board installed in parallel to the liquid crystal screen of the display unit. Therefore, it is not necessary to provide a separate substrate for installation like a Hall element, or even if another substrate is provided, another substrate can be installed in parallel to the circuit board in the image display unit, so that assembly work can be performed. It becomes easy and the assembly cost of the rotation detection mechanism is reduced.

  On the other hand, without using an MR element that is a magnetic field strength-dependent magnetic element, the rotation state of the image display unit can be detected by a magnetization direction sensitive element that does not depend on a gap change with the magnetic field generating member. . In other words, as long as the magnetic field vector changes due to the rotation of the image display unit, the amount of change in the resistance of the magnetization direction sensitive element increases even if the gap increases, so that the rotation state of the image display unit relative to the device body can be reliably detected. Become.

  As a result, a sufficient margin of sensitivity is generated in the positional accuracy when the magnetization direction sensitive element is attached, the temperature change in the surrounding environment, and the like, and the rotation state of the image display unit can be reliably detected at low cost. As a result of detecting the rotation state of the image display unit, for example, the screen inversion of the image display unit can be easily and accurately performed. As described above, according to the rotation detection mechanism of the present invention, the rotation state associated with the rotation operation of the image display unit can be detected easily and with high accuracy at low cost.

  Here, it is conceivable to use a spin valve giant magnetoresistive element (hereinafter referred to as a spin valve type GMR element) whose characteristics are shown in the graph of FIG. That is, this spin valve type GMR element is an element whose impedance changes with a slight change in the direction of the magnetic flux, unlike other elements such as an MR element that detects the strength of magnetism.

  According to the rotation detection mechanism of the second aspect, in addition to the configuration similar to the rotation detection mechanism of the first aspect, the magnetic field generating member is a magnet and the magnetization direction sensitive element is parallel to the circuit board in the image display unit. It is arranged on the image display unit side in a posture, and this magnet is arranged on the apparatus main body side.

  Therefore, according to the present invention, the same effect as in the first aspect can be obtained, but when the magnetization direction sensitive element is arranged on the image display unit side, the circuit board installed in parallel with the liquid crystal screen of the image display unit, for example. As the magnetism direction sensitive element is attached to the device body and the magnet is installed on the apparatus main body side, it is not necessary to take out the signal line from the contact type switch in the hinge mechanism as in Patent Document 1, so an expensive FPC is used. This eliminates the need to use the FPC and eliminates the cost of using the FPC, further reducing the assembly cost of the rotation detection mechanism.

  According to the rotation detection mechanism of the third aspect, in addition to the same configuration as the rotation detection mechanism of the first aspect, the magnetization direction sensitive element is disposed on the apparatus main body side in a posture parallel to the radial direction of the hinge shaft. A part of the hinge shaft is magnetized to form a magnetic field generating member.

  Therefore, according to the present invention, the same effect as in the first aspect can be obtained, but further, if a predetermined part of the hinge shaft is magnetized and this part is used as a magnetic field generating member which is a source of the external magnetic field vector. In addition, it is possible to detect the rotation state of the image display unit relative to the apparatus main body with the magnetization direction sensitive element without attaching a magnet and without a bias magnet. Accordingly, the number of parts of the rotation detection mechanism is reduced, and the assembly cost of the rotation detection mechanism is further reduced.

  According to the rotation detection mechanism of the fourth aspect, in addition to the same configuration as the rotation detection mechanism of the first aspect, the magnetization direction sensitive element is disposed on the apparatus main body side in a posture parallel to the radial direction of the hinge shaft. The magnetic field generating member is attached to a part of the hinge shaft.

  Therefore, according to the present invention, the same effect as in the first aspect can be obtained. Further, for example, a screw screwed to the hinge shaft is magnetized, and this screw is used as a magnetic field generating member to generate an external magnetic field vector. If this is the case, there is no need to attach another magnet, and the rotation state of the image display unit relative to the apparatus main body can be detected by the magnetization direction sensitive element without a bias magnet. Accordingly, the number of parts of the rotation detection mechanism is reduced as in the third aspect, and the assembly cost of the rotation detection mechanism is further reduced.

  According to the rotation detection mechanism of the fifth aspect, in addition to the configuration similar to that of the rotation detection mechanism of the first to fourth aspects, the magnetic field generating member and the magnetization direction can be used during face-to-face photography and when the image display unit is stored outward. The magnetic field generating member and the magnetization direction sensitive element are arranged in a positional relationship where the sensitive elements are close to each other.

  Therefore, according to the present invention, the same effects as those of the first to fourth aspects are achieved, but the magnetic field generating member and the magnetization are in close proximity to each other during the face-to-face photography and when the image display unit is stored outward. Since the direction sensitive element is arranged, it is possible to invert the image in the image display section reliably at these times.

  According to the rotation detection mechanism of the sixth aspect, in addition to the same configuration as the rotation detection mechanism of the first aspect, the magnetization direction sensitive element is configured to be a sensitive part of a spin valve type GMR element. Yes. Therefore, according to the present claim, since the magnetization direction sensitive element is the sensitive part of the spin valve type GMR element, it is possible to reliably detect the change in the magnetic flux direction due to the relative displacement with the magnetic field generating member. Thus, the effect of claim 1 can be achieved more reliably.

An apparatus with an image display unit according to claim 7 includes an image display unit for displaying an image,
An apparatus body that rotatably supports the image display unit via a hinge shaft;
A magnetic field generating member disposed on the apparatus main body side or on the hinge shaft and generating an external magnetic field;
A magnetization direction sensitive element that is arranged on the image display unit side or the apparatus main body side and detects the rotation state of the image display unit relative to the apparatus main body in response to a change in the magnetic flux direction;
It is characterized by having.

  In the apparatus with an image display unit according to a seventh aspect, the image display unit for displaying an image has a structure that is rotatably supported by the apparatus main body via a hinge shaft. In addition, a magnetic field generating member that generates an external magnetic field is disposed on the apparatus main body side or on the hinge axis, and a magnetization direction sensitive element that detects the rotation state of the image display unit with respect to the apparatus main body in response to a change in the magnetic flux direction, It is also arranged on the image display unit side or the apparatus main body side.

  Therefore, as the image display unit rotates with respect to the apparatus main body, the relative positional relationship between the magnetic field generating member and the magnetization direction sensitive element changes, and accordingly, the magnetization direction changes to the change in the magnetic flux direction. The sensitive element can sense and detect the rotation state of the image display unit. As a result of detecting the rotation state of the image display unit by the magnetization direction sensitive element, for example, the screen inversion of the image display unit can be easily and accurately performed. As described above, according to the apparatus with an image display unit according to the present invention, the rotation state associated with the rotation operation of the image display unit can be detected easily and with high accuracy at a low cost as in the case of the first aspect.

  According to the present invention, it is possible to obtain a rotation detection mechanism and an apparatus with an image display unit that can detect a rotation state associated with the rotation operation of the image display unit easily and with high accuracy at low cost. As a result of detecting the rotation state of the image display unit as described above, the screen inversion of the image display unit can be easily and accurately performed.

A first embodiment of a rotation detection mechanism and an apparatus with an image display unit according to the present invention is shown in FIGS. 1 to 9, and this embodiment will be described based on these drawings.
As shown in FIGS. 1 and 6, a device body 12 constitutes a body portion of a video camera recorder 10 which is a device with an image display unit according to the present embodiment. The apparatus main body 12 is provided with a photographing lens 14 and an image recording / reproducing magnetic head (not shown).

  As shown in FIGS. 2 to 5, both ends of the first hinge shaft 16 extending along the vertical direction of the apparatus main body 12 are rotatably attached to a position in the middle of the apparatus main body 12 in the vertical direction. The base end side of the rectangular link member 18 is supported through the first hinge shaft 16 so as to be rotatable around the first hinge shaft 16. And the magnet 20 which is a magnetic field generation member which generates an external magnetic field is installed in the location near the upper end side in the link member 18.

  Further, one end of a second hinge shaft 22 extending along a direction orthogonal to the first hinge shaft 16 is rotatably attached to a position in the middle in the vertical direction of the distal end side of the link member 18. An image display unit 24 for displaying an image is supported via the hinge shaft 22 so as to be rotatable around the second hinge shaft 22.

  That is, the image display unit 24 is rotatably supported by the apparatus main body 12 via the first hinge shaft 16, the link member 18, and the second hinge shaft 22. The magnet 20 is disposed in the link member 18 that is a member on the apparatus main body 12 side with the hinge shaft 22 interposed therebetween.

  The image display unit 24 includes a liquid crystal screen 26 serving as an image display portion, and a circuit board 28 for operating the liquid crystal screen 26 is built in. An image signal sent from the apparatus main body 12 is provided. Are processed on the circuit board 28 and displayed on the liquid crystal screen 26.

  A sensitive portion 30A of a spin valve type GMR element 30 which is a magnetization direction sensitive element capable of being sensitive to changes in the direction of magnetic flux is installed in a position parallel to the circuit board 28 in a portion near the link member 18 of the circuit board 28. Has been. That is, in the present embodiment, the sensitive unit 30A that can detect a change in the direction of the magnetic flux of the magnet 20 is mounted on the substrate 30B shown in FIG. 7 and arranged on the image display unit 24 side.

  That is, as shown in FIG. 7, the sensitive portion 30A is formed in a zigzag manner on the substrate 30B, and a pair of terminals 30C are connected to the sensitive portion 30A. Then, a pair of terminals 30C respectively connected to the sensitive part 30A is connected to the circuit board 28, and accordingly, necessary detection data is provided from the sensitive part 30A to the circuit board 28 via the pair of terminals 30C. It can be sent to a control unit (not shown).

  At this time, the sensitive part 30A of the spin valve type GMR element 30 whose impedance changes with a slight change in the angle of the magnetic flux direction is a magnetization direction sensitive element. The sensitive part 30A is particularly sensitive to changes in the magnetic flux direction. Is the direction indicated by the arrow A in FIGS. 2 to 5 and FIG. As shown in FIG. 8A, the sensitive portion 30A of the spin valve GMR element 30 shown in FIG. 7 includes a ferromagnetic pinned layer 31 and a nonmagnetic intermediate layer 32 whose magnetization directions are fixed. In addition, a ferromagnetic free layer 33 whose magnetization direction freely changes in the plane is formed by being laminated.

  The magnetization direction E of the free layer 33 changes according to the external magnetic field direction B, and the free layer 33 has a magnetization direction D with respect to the magnetization direction D of the pinned layer 31 as shown in FIG. When the magnetization direction E changes within the plane of the free layer 33 so as to be opposite, the resistance becomes maximum, and the magnetization direction E is free with respect to the magnetization direction D of the pinned layer 31 as shown in FIG. When the magnetization direction E of the layer 33 is changed in the plane of the free layer 33 so as to coincide with each other, the resistance is minimized. Thus, the sensitive unit 30A of the spin valve GMR element 30 can detect a change in the surrounding magnetic field direction.

  As described above, in the video camera recorder 10 according to the present embodiment, the image display unit 24 is rotatably supported by the apparatus body 12 via the first hinge shaft 16, the link member 18, and the second hinge shaft 22. By rotating the link member 18 around the first hinge shaft 16, the image display unit 24 is opened and closed with respect to the apparatus main body 12. Further, the link member 18 is rotated 90 degrees around the first hinge shaft 16 from the closed state where the image display unit 24 shown in FIG. 1 is positioned along the apparatus main body 12 to open the image display unit 24 shown in FIG. When the image display unit 24 rotates around the second hinge shaft 22 in the open state, the image display unit 24 can rotate with respect to the apparatus main body 12.

  Of the rotation states of the image display unit 24, the rotation state shown in FIG. 2 is the normal shooting at an angle of 0 degrees, and the state rotated from the normal shooting by +90 degrees as shown in FIG. 3 is the high angle shooting. As shown in FIG. 4, the state rotated by −90 degrees from the normal shooting is defined as low angle shooting. However, in these states, since the sensitive part 30A of the spin valve type GMR element 30 is separated from the magnet 20, the magnetic field vector due to the external magnetic field of the magnet 20 does not affect the sensitive part 30A, as shown in the graph of FIG. The resistance value of the sensitive part 30A becomes small.

  In this way, as a result of the sensing unit 30A detecting the rotation state of the image display unit 24 with respect to the apparatus main body 12, the control unit in the circuit board 28 is in the normal shooting, high angle shooting, and low angle shooting. The image signal is controlled so that the image is displayed on the normal screen in the liquid crystal screen 26 of the image display unit 24.

  Then, as shown in FIG. 5, the state rotated 180 degrees from the standard 0 degree angle is the face-to-face shooting, and the image display unit 24 is rotated 90 degrees around the second hinge shaft 22 from the high angle shooting or the low angle shooting. Thus, the sensitive part 30A comes close to the north pole of the magnet 20 at a predetermined angle at which the transition to the face-to-face shooting starts.

  As described above, the sensitive portion 30A of the spin valve type GMR element 30 faces the north pole of the magnet 20, so that the magnetic field vector component due to the external magnetic field and the magnetization direction of the pinned layer 31 shown in FIG. As the direction is reversed, the resistance value of the sensitive portion 30A increases as shown in the graph of FIG. Therefore, as a result of the sensing unit 30A detecting the rotation state of the image display unit 24 with respect to the apparatus main body 12, the control unit in the circuit board 28 flips the image upside down in the liquid crystal screen 26 during the face-to-face shooting. The image signal is controlled so as to be displayed as an image.

  Further, in the face-to-face shooting state where the sensitive unit 30A and the magnet 20 are close to each other, the link member 18 is rotated 90 degrees around the first hinge shaft 16 so that the image display unit 24 is positioned along the apparatus main body 12. In this state, the sensitive unit 30A and the magnet 20 can be stored in the apparatus main body 12 with the image display unit 24 facing outward as shown in FIG. An image that is an inverted image continues to be displayed in 26.

Next, the operation of the video camera recorder 10 according to the present embodiment will be described.
In the rotation detection mechanism according to the present embodiment and the video camera recorder 10 including the rotation detection mechanism, the image display unit 24 that displays an image is provided via the first hinge shaft 16, the link member 18, and the second hinge shaft 22. The apparatus main body 12 is rotatably supported, and rotates around the first hinge shaft 16 so that the image display unit 24 is brought into the open state shown in FIG.

  In this open state, the image display unit 24 is rotated 180 degrees around the second hinge shaft 22 with respect to the apparatus main body 12 to be in the state shown in FIG. The sensitive unit 30A arranged on the image display unit 24 side in a posture parallel to the circuit board 28 in the image display unit 24 is sensitive to a change in the magnetic flux direction of the external magnetic field generated by the magnet 20. Accordingly, the rotational state of the image display unit 24 relative to the apparatus main body 12 can be detected by the sensitive unit 30A.

  Therefore, since the rotation state of the image display unit 24 can be detected by the sensitive unit 30A of the spin valve type GMR element 30 that is a non-contact type switch, the video camera recorder 10 of the present embodiment has no failure due to contact wear, Increases durability. Accordingly, in the present embodiment, since the sensitive portion 30A is sensitive to changes in the direction of the magnetic flux caused by the external magnetic field generated by the magnet 20, the mounting accuracy of the sensitive portion 30A and the magnet 20 may be lowered, and as a result. The assembly cost of the video camera recorder 10 according to the present embodiment is reduced.

  On the other hand, in the present embodiment, as described above, the sensitive portion 30A that can be sensitive to changes in the direction of the magnetic flux is adopted, so the sensitive portion 30A is attached in a posture parallel to the circuit board 28 installed in parallel to the liquid crystal screen 26. It will be possible. Therefore, the assembling work becomes easy, and this also reduces the assembling cost of the video camera recorder 10.

  On the other hand, the rotational state of the image display unit 24 can be detected by the sensitive unit 30A of the spin valve GMR element 30 that does not depend on the gap change with the magnet 20. That is, as long as the magnetic field vector changes with respect to the pinned layer 31 shown in FIG. 8 of the sensitive unit 30A accompanying the rotation of the image display unit 24, the resistance change amount of the sensitive unit 30A increases even if the gap increases. 12, the rotation state of the image display unit 24 with respect to 12 can be reliably detected.

  As a result, a sufficient margin of sensitivity arises in the positional accuracy at the time of attaching the sensitive unit 30A, the temperature change of the surrounding environment, and the like, and the rotational state of the image display unit 24 can be reliably detected at low cost. As a result of detecting the rotation state of the image display unit 24, the image in the liquid crystal screen 26 of the image display unit 24 can be reversed easily and with high accuracy.

  As described above, according to the rotation detection mechanism and the video camera recorder 10 according to the present embodiment, the rotation state associated with the rotation operation of the image display unit 24 can be detected easily and accurately at a low cost. The image in the liquid crystal screen 26 can be reversed at an appropriate timing.

  On the other hand, in the present embodiment, the sensitive unit 30A is arranged on the image display unit 24 side in a posture parallel to the circuit board 28 installed in parallel with the liquid crystal screen 26 as described above, and the magnet 20 which is a magnetic field generating member. Is arranged on the link member 18 on the apparatus main body 12 side. Accordingly, it becomes unnecessary to use an expensive FPC as the signal line from the contact type switch in the hinge mechanism is not required, and the cost for using the FPC is not required. The assembly cost of the video camera recorder 10 when the magnet 20 is attached is further reduced.

Next, a second embodiment of the rotation detection mechanism and the apparatus with an image display unit according to the present invention is shown in FIG. 10, and this embodiment will be described based on this drawing. In addition, the same code | symbol is attached | subjected to the member same as the member demonstrated in 1st Embodiment, and the duplicate description is abbreviate | omitted.
As shown in FIG. 10, in the present embodiment, the sensitive portion 30 </ b> A of the spin valve GMR element 30 is arranged on the apparatus body 12 side in a posture parallel to the radial direction of the second hinge shaft 22, and this second hinge shaft 22. A magnetized screw 40, which is a magnetic field generating member, is screwed to a part of the flange portion 22A provided at the end of the head.

  Therefore, according to the present embodiment, the same effect as in the first embodiment is obtained, but further, a magnetized screw 40 is attached to the flange portion 22A which is a predetermined portion of the second hinge shaft 22, By using this part as a magnetic field generating member serving as an external magnetic field vector generation source, the screw 40 rotates together with the flange 22A as the image display unit 24 rotates, and the sensitive unit 30A of the spin valve type GMR element 30 The rotation state will be detected.

  For this reason, in this embodiment, it is not necessary to attach any other magnet, and the rotational state of the image display unit 24 relative to the apparatus main body 12 can be detected by the sensitive unit 30A without a bias magnet. The number of parts of the recorder 10 is reduced, and the assembly cost of the video camera recorder 10 is further reduced. Furthermore, in the present embodiment, the magnetized screw 40 is used, but instead of the screw 40, a part of the flange portion 22A of the second hinge shaft 22 may be magnetized to be a magnetic field generating member.

  In the first embodiment, when the image display unit 24 stored in the apparatus main body 12 with the image display unit 24 facing outward is closed, an image to be reversed is displayed in the liquid crystal screen 26. Although the display is continued, in order to detect the rotation state between the apparatus main body 12 and the link member 18 with the first hinge shaft 16 interposed therebetween, it is considered that a magnetic field generating member and a magnetization direction sensitive element are further arranged. It is done.

  In this case, as shown in FIG. 1, when the image display unit 24 that stores the image display unit 24 inward in the apparatus main body 12 is closed, the sensitive unit 30 </ b> A disposed on the image display unit 24 is closed. It becomes possible to stop displaying the image in the liquid crystal screen 26 in combination with the signal. That is, in this case, the rotation detection mechanism and the device with the image display unit have a structure that can detect the opening / closing and rotation of the image display unit, respectively.

  Furthermore, in the above embodiment, the image display unit-equipped device is an image recording / reproducing device such as a video camera recorder. However, in the present invention, the digital still camera, PDA, and portable device in which the image display unit is opened and closed and rotated. It can also be applied to telephones.

It is a perspective view which shows the video camera recorder which concerns on the 1st Embodiment of this invention, Comprising: It is a figure which shows the state which accommodated the image display part inward. It is a rear view which shows the video camera recorder which concerns on the 1st Embodiment of this invention, Comprising: It is a figure when image | photographing normally in the open state of the image display part. It is a rear view which shows the video camera recorder which concerns on the 1st Embodiment of this invention, Comprising: It is a figure when high angle imaging | photography is carried out in the open state of the image display part. It is a rear view which shows the video camera recorder which concerns on the 1st Embodiment of this invention, Comprising: It is a figure when low angle imaging | photography is carried out in the open state of the image display part. It is a front view which shows the video camera recorder which concerns on the 1st Embodiment of this invention, Comprising: It is a figure when face-to-face photography is carried out in the open state of the image display part. It is a perspective view which shows the video camera recorder which concerns on the 1st Embodiment of this invention, Comprising: It is a figure which shows the state which accommodated the image display part outward. It is a top view which shows the spin valve type | mold GMR element applied to embodiment of this invention. BRIEF DESCRIPTION OF THE DRAWINGS It is explanatory drawing which shows the structure of the sensitive part of the spin valve type | mold GMR element applied to embodiment of this invention, Comprising: (A) is explanatory drawing which shows a laminated structure, (B) is the magnetization direction of a pin layer. FIG. 6C is an explanatory diagram showing a state in which the magnetization direction of the free layer is reversed, and FIG. 8C is an explanatory diagram showing a state in which the magnetization direction of the free layer matches the magnetization direction of the pinned layer. It is a figure which shows the graph showing the relationship between the rotation state of the image display part of the video camera recorder which concerns on the 1st Embodiment of this invention, and the resistance value of a spin valve type GMR element. It is a front view which shows the video camera recorder which concerns on the 2nd Embodiment of this invention, Comprising: It is a figure when face-to-face photography is carried out in the open state of the image display part. It is a figure which shows the graph showing the relationship between the gap at the time of spin-valve type GMR element use, and the output voltage from a bridge circuit. FIG. 12 is a graph showing a relationship between a gap and an output voltage from a bridge circuit when a normal MR element is used, and the unit of the output voltage on the vertical axis is the same as the unit of the output voltage on the vertical axis in FIG. It is a graph.

Explanation of symbols

10 Video camera recorder (device with image display)
12 Device body 18 Link member 20 Magnet (magnetic field generating member)
22 Second hinge shaft 24 Image display section 28 Circuit board 30 Spin valve type GMR element 30A Sensing section (magnetization direction sensing element)
40 Screw (magnetic field generating member)

Claims (7)

A rotation detection mechanism used for a structure in which an apparatus main body rotatably supports an image display unit that displays an image via a hinge shaft,
A magnetic field generating member that generates an external magnetic field is arranged on the apparatus main body side or on the hinge shaft,
A magnetization direction sensitive element that can be sensitive to changes in the magnetic flux direction is arranged on the image display unit side or the apparatus main body side,
A rotation detection mechanism that detects a rotation state of an image display unit with respect to an apparatus main body by a magnetization direction sensitive element. The magnetic field generating member is a magnet, and the magnetization direction sensitive element is arranged on the image display unit side in a posture parallel to the circuit board in the image display unit,
The rotation detection mechanism according to claim 1, wherein the magnet is disposed on the apparatus main body side. The magnetization direction sensitive element is arranged on the apparatus main body side in a posture parallel to the radial direction of the hinge shaft,
2. The rotation detecting mechanism according to claim 1, wherein a part of the hinge shaft is magnetized to form a magnetic field generating member. The magnetization direction sensitive element is arranged on the apparatus main body side in a posture parallel to the radial direction of the hinge shaft,
The rotation detection mechanism according to claim 1, wherein a magnetic field generating member is attached to a part of the hinge shaft.   2. The magnetic field generating member and the magnetization direction sensitive element are arranged in a positional relationship in which the magnetic field generating member and the magnetization direction sensitive element are close to each other during face-to-face photography and when the image display unit is stored outward. The rotation detection mechanism according to claim 4.   The rotation detection mechanism according to claim 1, wherein the magnetization direction sensitive element is a sensitive part of a spin valve type GMR element. An image display section for displaying an image;
An apparatus body that rotatably supports the image display unit via a hinge shaft;
A magnetic field generating member disposed on the apparatus main body side or on the hinge shaft and generating an external magnetic field;
A magnetization direction sensitive element that is arranged on the image display unit side or the apparatus main body side and detects the rotation state of the image display unit relative to the apparatus main body in response to a change in the magnetic flux direction;
The apparatus with an image display part characterized by having.

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