JP2010112541A - Hinge device and electronic device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hinge device quickly resetting a lock body without using a cam. <P>SOLUTION: When a movable body 6 is at a first position, an engaging part 7b of the lock body 7 and an engaging part 6d of the movable body 6 are engaged with each other. When rotating the movable body 6 positioning at the first position, a lock support 9 is rotated, resisting the rotating force of a compression-torsion spring 11, to move the lock body 7 toward the lock support 9, and the engagement of the engaging part 7b of the lock body 7 with the engaging part 6d of the movable body 6 is released, and the engaging part 6d of the movable body 6 slides on a cam surface 8a of a fixed body 8. On the other hand, after the engaging part 6d of the movable body 6 passed through the engaging part 7b of the lock body 7, the compression-torsion spring 11 moves the lock body 7 toward the movable body 6 and rotates the lock body 7 relative to the lock support 9, and the lock body 7 is thereby supported by the lock support 9. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a hinge device incorporated in an electronic device such as a mobile phone, a game machine, or a personal computer.

  In an electronic device such as a mobile phone, a foldable device that can open and close the second housing with respect to the first housing is often used. One type of hinge device is known as a one-touch open type hinge device that can open a mobile phone by hand, and can automatically open a mobile phone by turning a knob or pressing a button. Yes.

  FIG. 16 is an exploded perspective view of a conventional one-touch open type hinge device. The hinge device includes a fixed body 31 fixed to the first housing and a movable case 32 fixed to the second housing. When the second casing is opened or closed with respect to the first casing, the movable case 32 rotates in the opening / closing direction with respect to the fixed body 31. A reverse body 33 is fixed to the fixed body 31. A sliding body 34 is provided around the reversing body 33 so as to be slidable in the axial direction. A cam surface 34 a is formed on the side surface of the sliding body 34. A movable cam 35 is accommodated in the movable case 32 so as to be slidable in the axial direction and not rotatable around the axial line. The movable cam 35 is urged against the cam surface 34 a of the sliding body 34 by a coil spring 36. The movable cam 35 slides on the cam surface 34a of the sliding body 34 by the urging force of the coil spring 36, and torque in the opening / closing direction is applied to the movable cam 35.

  FIG. 17 shows an operation diagram of the movable cam 35, the sliding body 34 and the reversing body 33. As shown in FIG. 17A, when the movable cam 35 is closed, the movable cam 35 contacts the right inclined surface of the mountain-shaped cam surface 34 a of the sliding body 34. In this state, the urging force is applied to the movable cam 35 by the coil spring 36 and the sliding body 34 in the further closing direction (right direction G in the figure). Next, as shown in FIG. 17B, when the knob portion 37 (see FIG. 16) is twisted against the biasing force of the torsion spring 39 and the release body 38 engaged with the knob portion 37 is rotated, the release body is rotated. As a result of the cam action of the cam 38 a of 38 and the support cam 34 b of the sliding body 34, the sliding body 34 is lowered, and the sliding body 34 becomes lower than the cam surface 33 a of the reversing body 33. As a result, the movable cam 35 is transferred from the cam surface 34 a of the sliding body 34 to the cam surface 33 a of the reversing body 33. Since the cam surface 33a of the reversing body 33 is formed with an inclined surface that biases the movable cam 35 in the opening direction, the movable cam 35 rotates in the opening direction H. As shown in FIG. 17 (c), while the movable cam 35 slides on the cam surface 33 a of the reversing body 33, the release body 38 is rotated and returned to the original position by the restoring force of the torsion spring 39. Accordingly, the sliding body 34 is raised and returned to the original position by the cam action of the release body 38 and the sliding body 34. As shown in FIG. 17D, in a state where the movable cam 35 is opened, the movable cam 35 comes into contact with the end portion of the left inclined surface of the cam surface 34a of the returned sliding body 34. In this state, a biasing force in the further opening direction (left direction H in the drawing) is applied to the movable cam 35 by the coil spring 36 and the sliding body 34.

The above is an explanation of the operation of each component when the mobile phone is automatically opened. When the cellular phone is opened by hand, the position of the sliding body 34 does not change in the vertical direction. By moving the movable cam 35 over the top of the cam surface 34a of the sliding body 34, the movable cam 35 slides on the left inclined surface of the sliding body 34, and the movable cam 35 is opened.
JP 2003-214423 A

  However, in the conventional hinge device, since the cam action of the supporting cam of the sliding body and the release cam of the releasing body is used to return the sliding body, there is a problem that the sliding body cannot be returned quickly. is there.

  Further, in the conventional hinge device, the movable cam and the cam surface of the sliding body are brought into contact with each other when the movable cam is open and closed. In addition, a double cam structure in which a reversing body having a cam surface approximating the cam surface of the sliding body is arranged inside the sliding body is employed, and is temporarily movable only when the knob is turned or the push button is pressed. The cam slides on the cam surface of the reversing body. However, there is a demand for downsizing the hinge device incorporated in a portable device, and the thickness of the cam surface of the sliding body in the radial direction has to be reduced by the amount of the inverted body disposed inside the sliding body. . When the thickness of the cam surface of the sliding body is reduced, there arises a problem that durability is deteriorated.

  Furthermore, there is also a problem that the sliding body cannot be returned to the original position unless the movable cam is rotated close to the open state. That is, there is a problem that even if the second casing is closed again in a state where the second casing is not completely opened, the sliding body is not locked and the second casing is opened again. This is because a cam surface approximate to the cam surface of the sliding body is formed on the reversing body.

  The present invention solves such a problem of the conventional hinge device, and is capable of quickly returning the lock body without using a cam and improving the durability of the hinge device. An object is to provide an electronic device used.

  In order to solve the above-mentioned problem, the invention according to claim 1 is a fixed body having a cam surface, a movable body rotating with respect to the fixed body, and urging the movable body against the cam surface of the fixed body. An urging member, a lock body provided so as not to rotate with respect to the fixed body, a lock support body supporting the lock body, and a compression / twist provided between the lock body and the lock support body And when the movable body is in a first position with respect to the fixed body, the engaging portion of the lock body and the engaging portion of the movable body are engaged, and the first position When the movable body is rotated with respect to the fixed body, the lock body moves toward the lock support body by rotating the lock support body against the rotational force of the compression / torsion spring. The engagement portion of the lock body and the engagement of the movable body The engagement portion of the movable body slides on the cam surface of the fixed body, while the engagement portion of the movable body passes through the engagement portion of the lock body, and then the compression / torsion spring is released. Is a hinge device in which the lock support body supports the lock body by moving the lock body toward the movable body and rotating the lock body relative to the lock support body.

  According to a second aspect of the present invention, in the hinge device according to the first aspect, a part of the lock body can be projected and retracted from a cam surface of the fixed body, and the movable body is in the first position. When the engaging part of the lock body protruding from the cam surface of the fixed body engages with the engaging part of the movable body, the movable body at the first position rotates with respect to the fixed body. When the engaging portion of the lock body falls from the cam surface of the fixed body, the engaging portion of the movable body and the engaging portion of the lock body are disengaged, and the engaging portion of the movable body is engaged. The part slides on the cam surface of the fixed body, and after the engaging part of the movable body passes through the engaging part of the lock body, the engaging part of the lock body projects again from the cam surface of the fixed body, While the movable body rotates from the first position with respect to the fixed body, the movable body Engaging portion, characterized in that contacts the cam surface of the fixed body.

  According to a third aspect of the present invention, in the hinge device according to the first or second aspect, a guide groove is formed on the inner peripheral surface of the fixed body to guide the movement of the lock body. To do.

  According to a fourth aspect of the present invention, there is provided the hinge device according to any one of the first to third aspects, a first housing to which the fixed body of the hinge device is mounted, and the movable body of the hinge device. And an electronic device that folds or opens the second housing relative to the first housing.

  According to the first aspect of the present invention, since the axial force / rotational force applying spring interposed between the lock body and the lock support body directly returns the lock body, the lock body can be moved without using a cam. It can be returned quickly.

  According to the second aspect of the present invention, since the cam surface of the fixed body is always slid while the movable body is rotating, it is not necessary to provide an inversion body on which the movable body slides inside the fixed body. . Since the cam surface of the fixed body can be made larger as long as the reversing body is not provided, the durability of the cam surface of the fixed body can be improved. Furthermore, since the lock body can be returned immediately after the movable body passes through the lock body, the lock body can be returned at a stage where the opening angle of the movable body does not become so large.

  According to the third aspect of the present invention, the lock body can be disposed on the outer side in the radial direction of the fixed member by the amount of the guide groove formed on the inner peripheral surface of the fixed body. The biasing force that biases the closed movable body in the closing direction is proportional to the product of the force by which the biasing member presses the movable body against the lock body and the radial position of the lock body. By forming a guide groove on the inner peripheral surface of the fixed body and disposing the lock body on the outer side in the radial direction of the fixed member, the urging force for keeping the closed state can be increased.

  A hinge device according to an embodiment of the present invention will be described below with reference to the accompanying drawings. 1 and 2 show a mobile phone in which a hinge device according to an embodiment of the present invention is incorporated. FIG. 1 shows a state in which the mobile phone is opened, and FIG. 2 shows a state in which the mobile phone is closed. A key button, a battery, a microphone, and the like are arranged in the operation-side casing 1 as the first casing. A display device 2 such as a liquid crystal display device, a small speaker, and the like are disposed in the display-side housing 2 as the second housing. The operation side housing 1 is provided with two connecting cylinder portions 1a. The display-side casing 2 is provided with one connecting cylinder portion 2a sandwiched between two connecting cylinder portions 1a of the operation-side casing 1. The hinge device 4 is incorporated in the connecting cylinder portion 2 a of the display-side casing 2 and the connecting cylinder portion 1 a of the operation-side casing 1.

  When the push button 3 of the hinge device 4 is pressed, the closed cellular phone shown in FIG. 2 is automatically opened. The hinge device 4 guides the display side housing 2 to rotate relative to the operation side housing 1. Further, the hinge device 4 applies an urging force in the opening direction to the display-side housing 2 in the opened state, and further applies an urging force in the closing direction to the display-side housing 2 in the closed state. This is to stabilize the open state and the closed state of the mobile phone.

  FIG. 3 is an exploded perspective view of the hinge device 4. The hinge device 4 includes a cylindrical case 5 that is fixed to the display-side housing 2 and a fixed body 8 that is fixed to the operation-side housing 1. When the cellular phone is opened or closed, the case 5 rotates in the opening / closing direction with respect to the fixed body 8.

  The case 5 is formed in a bottomed cylindrical shape. A plurality of flat surfaces 5 a are formed on the outer peripheral surface of the case 5 so that the case 5 can be fixed to the display-side housing 2 in a non-rotatable manner.

  A movable body 6 is accommodated in the case 5 so as to be linearly movable in the axial direction. A flat surface 6 a corresponding to the flat surface 5 a of the case 5 is formed on the outer peripheral surface of the movable body 6. The movable body 6 accommodated in the case 5 cannot rotate around the axis with respect to the case 5.

  FIG. 5 shows a detailed view of the movable body 6. The movable body 6 has a main body portion 6b and a pair of claw portions 6c protruding from the main body portion 6b toward the fixed body 8. The pair of claw portions 6c are provided with an interval of 180 degrees in the circumferential direction. At the tip of the claw portion 6c, an arcuate top portion 6d is formed as an engaging portion that engages with a lock body 7 described later. The outer peripheral surface of the top portion 6d is a cam surface. The flat surface 6a described above is formed on the outer peripheral surface of the main body 6b. A through hole 6e through which the shaft body 13 (see FIG. 3) passes is formed in the main body portion 6b of the movable body 6. The movable body 6 moves linearly along the shaft body 13.

  As shown in FIG. 3, between the bottom of the case 5 and the movable body 6, inner and outer double compression springs 10 a and 10 b are arranged as biasing members. The compression springs 10 a and 10 b urge the movable body 6 toward the cam surface 8 a of the fixed body 8. An inclined surface is formed on the cam surface 8 a of the fixed body 8 so as to give a rotational force in the opening direction to the movable body 6. When the movable body 6 slides on the cam surface 8a of the fixed body 8 by the biasing force of the compression springs 10a and 10b, a rotational force in the opening direction is applied to the movable body 6. Here, since the fixed body 8 is fixed to the operation-side casing 1 and the case 5 is fixed to the display-side casing 2, a rotational force in the opening direction is given to the display-side casing 2.

  FIG. 6 shows a detailed view of the fixed body 8. The fixed body 8 includes a main body portion 8 c and a cam portion 8 b that protrudes from the main body portion 8 c toward the movable body 6. A pair of cam surfaces 8 a that contact each of the pair of top portions 6 d of the movable body 6 are formed on the end surface of the cam portion 8 b. A guide groove 21 is formed in the cam portion 8 b of the fixed body 8 to guide the movement of the lock body 7. The guide groove 21 extends in the axial direction from the cam surface 8 a of the fixed body 8 toward the inside of the fixed body 8. A pair of arc-shaped guide surfaces 22 is formed on the inner peripheral surface of the main body 8 c of the fixed body 8. The pair of guide surfaces 22 guides the lock support 9 described later to rotate relative to the fixed body 8. Further, a washer fitting groove 23 into which the washer 12 (see FIG. 3) is fitted is formed in the main body portion 8c of the fixed body 8.

  As shown in FIG. 3, in order to lock the display-side housing 2 in the closed state, the fixed body 8 is provided with a lock body 7 that can be protruded and retracted from the cam surface 8 a of the fixed body 8. When the lock body 7 is engaged with the top portion 6 d of the movable body 6, the rotation of the movable body 6 in the opening direction is locked.

  FIG. 7 shows a detailed view of the lock body 7. The lock body 7 includes a ring-shaped main body portion 7a, a pair of lock engaging portions 7b protruding in the radial direction from the main body portion 7a, and a pair of substantially rectangular protrusions protruding in the axial direction from the end surface of the main body portion 7a. 7c. The lock engaging portion 7b that contacts the top portion 6d of the movable body 6 is arc-shaped chamfered. The length of the lock engaging portion 7b in the circumferential direction is shorter than the length of the cam surface 8a of the fixed body 8 in the circumferential direction. The lock engaging portion 7b is guided in the guide groove 21 (see FIG. 6) of the fixed body 8. The lock body 7 can linearly move in the axial direction with respect to the fixed body, but cannot rotate about the axis. The pair of convex portions 7c of the lock body 7 is in contact with an end surface of a lock support body 9 to be described later. A cutout 7e (see FIG. 3) is formed in the main body portion 7a of the lock body 7. A compression / torsion spring 11 to be described later is fitted into the notch 7e. A through-hole 7 d through which the shaft body 13 passes is formed in the main body portion 7 a of the lock body 7. The linear motion in the axial direction of the lock body 7 is guided by the shaft body 13.

  As shown in FIG. 3, in order to automatically open the display-side housing 2 by pressing the push button 3, it is only necessary to disengage the movable body 6 and the lock body 7. A lock support body 9 is provided to cause the lock body 7 to fall below the cam surface 8 a of the fixed body 8.

  FIG. 8 shows a detailed view of the lock support 9. The lock support body 9 includes a bottomed cylindrical main body portion 9a accommodated inside the fixed body 8, and a pair of cam portions 9b protruding outward from the main body portion 9a in the radial direction. A pair of recesses 9c are formed on the end surface of the main body 9a. The convex part 7c of the lock body 7 fits into the concave part 9c. The outer diameter of the main body 9 a of the lock support 9 is equal to the outer diameter of the main body 7 a of the lock 7. A notch 9 d is formed in the main body 9 a of the lock support 9. The compression / torsion spring 11 is fitted into the notch 9d.

  FIG. 4 is a perspective view of the assembled hinge device 4. In the figure, (a) shows the hinge device 4 with the case 5 removed, and (b) in the figure shows a state in which the fixed body 8 is further removed. As shown in FIG. 2B, the lock support 9 supports the lock body 7 in a state where the convex portion 7c of the lock body 7 is placed on the end surface. By rotating the lock support 9 around its axis, the protrusion 7 c of the lock body 7 fits into the recess 9 c of the lock support 9. Thereby, the lock body 7 moves toward the lock support body 9, and the engagement between the top portion 6 d of the movable body 6 and the lock body 7 is released. When this happens, the movable body 6 starts to slide along the cam surface 8 a of the fixed body 8.

  In order to rotate the lock support 9, a push button 3 is provided. FIG. 9 shows a detailed view of the push button 3. The push button 3 has a disk-shaped main body 3 a and a pair of legs 3 b inserted into the fixed body 8. A cam surface 3d that contacts the cam portion 9b of the lock support 9 is formed at the tip of the leg portion 3b. The push button 3 can only move linearly in the axial direction with respect to the fixed body 8. By pushing the push button 3, the cam surface 3d of the push button 3 pushes the cam portion 9b of the lock support 9, and the lock support 9 rotates around the axis by the action of these cams.

  As shown in FIG. 4, a compression / torsion spring 11 is provided between the lock body 7 and the lock support body 9. The compression / torsion spring 11 provides an axial force for moving the lock support 9 in the axial direction and also provides a rotational force for rotating around the axis. As shown in FIG. 4B, the compression / torsion spring 11 pushes up the lock body 7 from the recess 9c of the lock support 9 and then rotates the lock body 7 so that the lock support 9 supports the lock body 7. To do.

  As shown in FIG. 3, the case 5, the double compression springs 10a and 10b, the movable body 6, the lock body 7, the fixed body 8, the compression / torsion spring 11, and the push button 3 are arranged on the same axis. These parts are integrated by the shaft body 13. These components are sequentially assembled to the shaft body 13, the washer 12 is attached to the distal end portion of the shaft body 13, and the distal end portion of the shaft body 13 is caulked and fixed to the washer to integrate them.

  FIG. 10 shows a side view of the hinge device 4. The rotation angle of the movable body 6 in the closed state is set to 0 degree. In FIGS. 2A and 2B, the direction in which the hinge device 4 is viewed is rotated by 90 degrees in order to show the internal structure in an easily understandable manner. The same applies to FIGS. 11 to 15 below.

  Before the hinge device 4 is incorporated into the mobile phone, the top 6d of the movable body 6 in the closed state comes into contact with the cam surface 8a of the lock body 7 and the fixed body 8. When the hinge device 4 is incorporated in a mobile phone, the movable body 6 comes into contact with only the lock body 7. This is because the urging force is applied to the movable body 6 in the closing direction by the compression springs 10a and 10b and the lock body 7 in a state where the movable body 6 is closed.

  FIG. 11 shows a detailed view of the movable body 6 and the fixed body 8 in the closed state. As shown in FIG. 11, when the movable body 6 is in a closed state (first position), the movable body 6 contacts the lock body 7.

  As shown in FIG. 12, when the push button 3 is pressed, the lock support 9 rotates, and the lock body 7 pushed by the movable body 6 falls into the recess 9 c of the lock support 9. A compression / torsion spring 11 is interposed between the lock body 7 and the lock support body 9, but the urging force of the compression / torsion spring 11 is weaker than the urging force of the compression springs 10a, 10b. For this reason, the lock body 7 fits into the recess 9 c of the lock support 9, and the lock body 7 falls below the cam surface 8 a of the fixed body 8. When the lock body 7 falls below the cam surface 8 a of the fixed body 8, the movable body 6 and the lock body 7 are disengaged, and the movable body 6 starts to slide on the cam surface 8 a of the fixed body 8. Immediately after the movable body 6 and the lock body 7 are disengaged, the movable body 6 slides on the cam surface 8 a outside the guide groove 21 of the fixed body 8. In the state where the lock body 7 is supported by the lock support body 9, the lock body 7 does not fall even if the urging force of the compression springs 10 a and 10 b is applied.

  As shown in FIG. 13, the movable body 6 rotates while sliding on the cam surface 8 a of the fixed body 8. When the top portion 6 d of the movable body 6 passes through the lock body 7, a gap is left between the movable body 6 and the cam surface 8 a of the fixed body 8 where the lock body 7 is provided. Since the compression / torsion spring 11 always urges the lock body 7 upward toward the movable body 6, the lock body 7 is raised by the compression / torsion spring 11.

  As shown in FIG. 14, when the movable body 6 rotates 60 degrees, there is a clearance between the movable body 6 and the fixed body 8 so that the lock body 7 is completely returned. Since the urging force from the compression springs 10 a and 10 b is not applied to the lock body 7, the lock body 7 is raised to the original position by the urging force of the compression / torsion spring 11. When the lock body 7 is raised to the original position, the lock support body 9 is rotated by the rotational force of the compression / torsion spring 11. Thereby, the convex part 7c of the lock body 7 rides on the end surface of the lock support body 9, and the lock support body 9 comes to support the lock body 7 (see FIG. 4B). At this time, the compression / torsion spring 11 restores the push button to the original position.

  FIG. 15 shows a state where the movable body 6 is opened. The movable body 6 is rotated 180 degrees from the closed state to the open state. When the movable body 6 is open, the top 6 d of the movable body 6 contacts the bottom of the cam surface 8 a of the fixed body 8. Before the hinge device 4 is incorporated into a mobile phone, it is impossible to apply a biasing force in the opening direction to the movable body 6 that has fallen into the bottom of the cam surface 8a of the fixed body 8. When the hinge device 4 is incorporated in a mobile phone, the opening angle of the movable body 6 is slightly narrowed, and an urging force can be applied to the movable body 6 by the compression springs 10a and 10b and the fixed body 8 in a further opening direction.

  The above is the operation of each component when the push button 3 is pressed. When the display-side housing 2 of the cellular phone is opened by hand, the display-side housing 2 is rotated by the urging force of the compression springs 10a and 10b when the display-side housing 2 is rotated until the top 6d of the movable body 6 gets over the lock body 7. 2 automatically opens.

  In addition, this invention is not limited to the said embodiment, In the range which does not change the summary of this invention, it can change variously. For example, a flat portion may be formed on the cam surface of the fixed body, and when the display-side casing is opened by hand, the display-side casing may stop at an opening angle of 90 degrees. When the push button is pushed, the top of the movable body moves over the flat part of the cam surface of the fixed body with momentum.

The figure which shows the open state of the mobile telephone in which the hinge apparatus of one Embodiment of this invention is integrated ((a) in a figure shows a side view, (b) shows a front view) The figure which shows the closed state of a mobile telephone ((a) shows a side view, (b) shows a front view in the figure) Exploded perspective view of hinge device A perspective view of the assembled hinge device ((a) in the figure shows a state where the case is removed, and (b) in the figure shows a state where the fixing body is further removed) Detailed view of movable body ((a) in the figure shows a perspective view, and (b) and (c) in the figure show side views) Detailed view of fixed body ((a) in the figure shows a perspective view, and (b) and (c) in the figure show side views) Detailed view of lock body ((a) shows perspective view, (b), (c) shows side view) Detailed view of lock support ((a) shows perspective view, (b), (c) shows side view) Detailed view of push button ((a) shows perspective view, (b), (c) shows side view) Side view of hinge device in closed state Detailed view of movable body and fixed body in closed state ((a) and (b) in the figure show side views) Detailed view of movable body and fixed body in closed state ((a) and (b) in the figure show side views) Detailed view of movable body and fixed body in 40 ° open state ((a) and (b) in the figure show side views) Detailed view of movable body and fixed body in 60 ° open state ((a) and (b) in the figure show side views) Side view of hinge device in open state Exploded perspective view of a conventional hinge device Operation diagram of conventional hinge device

Explanation of symbols

1 ... Operation side housing (first housing)
2 ... Display side housing (second housing)
3 ... push button 4 ... hinge device 5 ... case 6 ... movable body 6d ... top (engagement portion)
7: Lock body 7b: Lock engaging portion (engaging portion)
8 ... Fixed body 8a ... Cam surface 9 ... Lock support bodies 10a, 10b ... Compression spring (biasing member)
11 ... Compression / torsion spring 21 ... Guide groove

Claims (4)

A fixed body having a cam surface; a movable body that rotates relative to the fixed body; a biasing member that biases the movable body against the cam surface of the fixed body; and a rotation member that does not rotate relative to the fixed body. A lock body, a lock support body that supports the lock body, and a compression / torsion spring provided between the lock body and the lock support body,
When the movable body is in the first position with respect to the fixed body, the engaging portion of the lock body and the engaging portion of the movable body are engaged,
When the movable body in the first position is rotated with respect to the fixed body, the lock body is rotated against the rotational force of the compression / torsion spring so that the lock body supports the lock support. While moving toward the body, the engagement portion of the lock body and the engagement portion of the movable body are disengaged, and the engagement portion of the movable body slides on the cam surface of the fixed body,
After the engaging portion of the movable body passes through the engaging portion of the lock body, the compression / torsion spring moves the lock body toward the movable body and moves the lock body relative to the lock support body. A hinge device in which the lock support body supports the lock body by rotating. A part of the lock body can be freely protruded and projected from the cam surface of the fixed body,
When the movable body is in the first position, the engaging portion of the lock body that protrudes from the cam surface of the fixed body engages with the engaging portion of the movable body,
When the movable body in the first position is rotated with respect to the fixed body, the engagement portion of the lock body falls from the cam surface of the fixed body, so that the engagement portion of the movable body and the lock The engagement with the body is disengaged, and the engagement portion of the movable body slides on the cam surface of the fixed body, while the engagement portion of the movable body passes through the engagement portion of the lock body. The engaging part of the lock body protrudes again from the cam surface of the fixed body,
The engaging portion of the movable body abuts on a cam surface of the fixed body while the movable body rotates from the first position with respect to the fixed body. Hinge device.   The hinge device according to claim 1, wherein a guide groove that guides the movement of the lock body is formed on an inner peripheral surface of the fixed body.   The hinge device according to any one of claims 1 to 3, a first housing to which the fixed body of the hinge device is mounted, and a second housing to which the movable body of the hinge device is mounted. , And an electronic device that folds or opens the second housing relative to the first housing.

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