JP6397195B2 - Biaxial hinge device - Google Patents

Description

  The present invention relates to a biaxial hinge device used in a folding electronic device such as a notebook personal computer, a portable information terminal, an electronic notebook, an electronic dictionary, a portable game machine, and a mobile phone.

  Conventionally, a foldable electronic device has been developed that is easy to carry by users and does not take up space during storage. For example, in a notebook personal computer, a cover portion provided with a liquid crystal display or the like is attached to a main body portion provided with a CPU, a magnetic disk, a memory, a keyboard and the like so as to be freely opened and closed. The liquid crystal display and the keyboard are exposed and opened by opening the cover. The entire electronic device is folded compactly by closing the cover.

  In recent years, electronic devices in which a touch panel is added to a liquid crystal display have been developed. The user can operate the electronic device using a touch panel in addition to the keyboard. In an electronic device to which a touch panel is added, usage methods in which the opening angle of the cover part is different are considered. In the same way as before, the main body is placed on a desk and the keyboard is operated with the cover opened about 130 °, as well as the touch panel mainly opened with the cover opened about 180 °, 315 °, 360 °. It is also possible to use it to operate.

  In the foldable electronic device, when the cover part can be opened and closed up to 360 ° beyond 180 °, the first shaft member is attached to the housing of the cover part, and the second shaft member is attached to the housing of the main body part, A biaxial hinge device in which both shaft members are arranged in parallel is used. From the viewpoint of operation, the biaxial hinge device includes an asynchronous type in which the rotation by the first shaft member and the rotation by the second shaft member are not synchronized, and a synchronous type in which the rotation is synchronized. For example, Patent Literature 1 discloses an asynchronous biaxial hinge device, and Patent Literature 2 and Patent Literature 3 disclose a synchronous biaxial hinge device.

  The biaxial hinge device described in Patent Literature 1 includes a first shaft member attached to the first housing, a second shaft member attached to the second housing, a first shaft member, and a connecting member that connects the second shaft member. And a regulating member that is disposed between the first shaft member and the second shaft member and selectively regulates rotation. The restriction member restricts the other shaft from rotating when either one of the first shaft member and the second shaft member rotates.

  The biaxial hinge device described in Patent Literature 2 includes gears on the peripheral side portions of the first shaft member and the second shaft member, and includes two connecting gears that connect the gears in series. When one of the first shaft member and the second shaft member rotates, the rotation is transmitted by the connecting gear, and the other rotates in synchronization.

  The biaxial hinge device described in Patent Document 3 is an annular first hinge body that is attached to a first housing and an annular second hinge that is attached to a second housing and is disposed on the side of the first hinge body. A pair of cords or belt-like interlocking belts are provided so as to extend along the peripheral side portions of the body, the first hinge body, and the second hinge body. The first hinge body and the second hinge body are interlocked so as to rotate in opposite directions due to the tension of the pair of interlocking bands.

JP 2013-249855 A JP 2008-121795 A JP 2004-316382 A

  However, in the biaxial hinge device described in Patent Literature 1, when the first housing is opened 180 degrees with respect to the second housing, the first shaft member and the second shaft member are restricted by the restriction member. Only one of them rotates. Since the first housing and the second housing have a thickness, even if only one of the first shaft member and the second shaft member rotates 180 ° to make the whole flat, the first housing and the second housing A step corresponding to the thickness of the second housing is generated. For example, even if the first casing on which the liquid crystal display with a built-in touch panel is mounted is rotated by 180 ° with respect to the second casing to make it flat, the difference in the thickness according to the thickness of the second casing There is a problem that play occurs when an input operation is performed by pressing the touch panel.

  In addition, since the two-shaft hinge device described in Patent Document 2 incorporates two connecting gears, the number of parts such as a shaft part and a bracket that supports the shaft part is increased in addition to the connecting gear. Since gears are provided on the peripheral side portions of the shaft member and the second shaft member, the cost is increased. Further, since the two connecting gears are fitted to the gears provided on the peripheral side portions of the first shaft member and the second shaft member, the backlash generated at three locations causes the first housing and the second housing to There is a problem that an angle shift occurs.

  Further, in the biaxial hinge device described in Patent Document 3, excessive stress is generated in the string or the belt-like interlocking band, and the durability may be lowered. With respect to the size of the electronic device, the dimension from the axial center of the first hinge body and the second hinge body of the biaxial hinge device to the connection point of the interlocking band is very small. For this reason, the force applied to the electronic device when opening and closing is amplified by the lever principle, and a large stress is generated in the interlocking band. There is a possibility that the interlocking band is damaged particularly when the electronic device is opened and closed vigorously.

  The present invention has been made in view of such circumstances, and an object of the present invention is a biaxial shaft that can rotate the two shafts synchronously, hardly generate backlash, and can further improve durability. It is to provide a hinge device.

The biaxial hinge device according to the present invention is provided with a first shaft member provided with a first guide portion on a peripheral side portion, and in parallel with the first shaft member, and a second guide portion provided on the peripheral side portion. A second shaft member, and a slide member that has a fitting portion that fits into the first guide portion and the second guide portion, and is supported so as to be slidable in the axial direction of the first shaft member. In the biaxial hinge device, the first guide portion and the second guide portion are formed in a spiral shape that is reversely wound.

In the present invention, the first guide member is provided on the peripheral side portion of the first shaft member, and the second guide portion is provided on the peripheral side portion of the second shaft member, and the first shaft member and the second shaft member are provided. Are arranged in parallel. A slide member having a fitting portion fitted to the first guide portion and the second guide portion slides in the axial direction of the first shaft member. The 1st guide part and the 2nd guide part are formed in the mutually spiral spiral shape. When the first shaft member is rotated, the fitting portion is guided by the spiral first guide portion, and the slide member slides in the axial direction of the first shaft member. When the sliding member slides, the fitting portion that fits into the second guide portion formed in the reversely wound spiral shape slides in the axial direction of the first shaft member. It rotates in synchronization with the rotation.

  The biaxial hinge device according to the present invention is characterized in that the first guide portion and the second guide portion are provided in a groove shape.

  In the present invention, since the first guide portion and the second guide portion are groove-shaped and the fitting portion is fitted to the groove-shaped first guide portion and second guide portion, the connecting gear is used. As compared with the backlash that occurs in the conventional mechanism, play is less likely to occur. Further, by increasing the groove width, the outer dimensions of the fitting portion are increased and the strength of the fitting portion is increased, so that the durability can be improved.

  The biaxial hinge device according to the present invention is characterized in that the first guide portion and the second guide portion are provided in a convex shape.

  In the present invention, the first guide portion and the second guide portion are provided in a convex shape, and the fitting portion is fitted to the first guide portion and the second guide portion of the convex shape, The backlash is less likely to occur compared to the backlash generated in the mechanism using the connecting gear. Moreover, by setting it as a wide protruding item | line shape, the intensity | strength of a 1st guide part and a 2nd guide part increases, and durability can be improved.

  The biaxial hinge device according to the present invention is inserted into the shaft body of the first shaft member, and is inserted into the shaft body of the second shaft member and the first cylinder body having the first guide portion formed on the peripheral surface thereof. And a second cylinder having the second guide portion formed on the peripheral surface.

  In this invention, the 1st cylinder which formed the 1st guide part in the peripheral surface is inserted in the shaft of the 1st axis member, and the 2nd cylinder which formed the 2nd guide part in the peripheral surface is The shaft is inserted into the second shaft member. Separately from the first shaft member and the second shaft member, by providing a first cylinder having a first guide portion formed on the peripheral surface, and a second cylinder having a second guide portion formed on the peripheral surface, Each part can be easily processed, and the manufacturing cost can be reduced.

  The biaxial hinge device according to the present invention includes a connecting member that rotatably supports and connects the first shaft member and the second shaft member, and is supported by the connecting member so that the slide member can slide. And a third shaft member to be supported.

  In the present invention, the connecting member supports the first shaft member and the second shaft member rotatably, and further supports the third shaft member slidably supporting the slide member. Is simplified.

  The biaxial hinge device according to the present invention is characterized in that the first guide portion and the second guide portion have a spiral lead angle of 20 ° to 45 °.

  In the present invention, since the lead angle of the spiral of the first guide part and the second guide part is 20 ° to 45 °, the shift of the rotation angle of the first shaft member and the second shaft member is suppressed, Resistance during rotation of the first shaft member and the second shaft member is suppressed.

According to the present invention, the first guide portion is provided on the peripheral side portion of the first shaft member, and the second guide portion is provided on the peripheral side portion of the second shaft member, and the first shaft member and the second shaft member are They are arranged in parallel. A slide member having a fitting portion fitted to the first guide portion and the second guide portion slides in the axial direction of the first shaft member. The 1st guide part and the 2nd guide part are formed in the mutually spiral spiral shape. When the first shaft member is rotated, the fitting portion is guided by the spiral first guide portion, and the slide member slides in the axial direction of the first shaft member. When the sliding member slides, the fitting portion that fits into the second guide portion formed in the reversely wound spiral shape slides in the axial direction of the first shaft member , so that the second shaft member is moved to the first shaft member. It can be rotated in synchronization with the rotation.

It is a perspective view which shows the external appearance of the electronic device using the biaxial hinge apparatus which concerns on Embodiment 1 of this invention. It is a perspective view which shows the external appearance in the state which opened and closed the electronic device using the biaxial hinge apparatus which concerns on Embodiment 1 of this invention to each predetermined angle. It is a perspective view which shows the external appearance of the biaxial hinge apparatus which concerns on Embodiment 1 of this invention. It is a disassembled perspective view of a biaxial hinge apparatus. It is a front view of a biaxial hinge device. It is a perspective view which shows the external appearance of a slide member. It is a perspective view which shows the external appearance in the state which rotated the biaxial hinge apparatus to each predetermined angle. It is a perspective view which shows the external appearance in the state which opened the electronic device using the biaxial hinge apparatus 1 315 degrees. It is a perspective view which shows the external appearance of the 1st cam cylinder and 2nd cam cylinder of the biaxial hinge apparatus which concerns on Embodiment 2 of this invention. It is a front view of the biaxial hinge apparatus which concerns on Embodiment 3 of this invention. It is a perspective view which shows the external appearance of a slide member.

  Embodiments of a biaxial hinge device according to the present invention will be described below with reference to the drawings.

(Embodiment 1)
FIG. 1 is a perspective view showing an external appearance of an electronic apparatus 100 using a biaxial hinge device 1 according to Embodiment 1 of the present invention, and FIG. 2 shows the biaxial hinge device 1 according to Embodiment 1 of the present invention. It is a perspective view which shows the external appearance in the state which opened and closed the used electronic device 100 to each predetermined angle. The electronic device 100 is, for example, a notebook personal computer, and may be other foldable devices such as a portable information terminal, an electronic notebook, an electronic dictionary, a portable game machine, and a mobile phone.

  The electronic device 100 includes a cover part 110, a main body part 120, and the biaxial hinge device 1. The cover unit 110 includes a liquid crystal display 111 and a cover unit housing 113 on which the liquid crystal display 111 is mounted. The liquid crystal display 111 includes a liquid crystal panel that displays processed data, characters, images, and the like on the display surface 112, a touch panel that can perform an input operation by touching the display surface 112, and the like (not shown). The cover housing 113 has a rectangular shape and covers the peripheral edge of the liquid crystal display 111 and the surface opposite to the display surface 112.

  The main body 120 includes a keyboard 121, a touch pad 122, and a main body housing 123. The keyboard 121 and the touch pad 122 are attached to the main body housing 123 so that the operation part is exposed. The main body housing 123 has a rectangular shape and houses a CPU, a magnetic disk, a memory, and the like (not shown) inside. One biaxial hinge device 1 is attached to each of both ends of one side corresponding to the cover housing 113 and the main body housing 123. The cover part 110 can be opened and closed with respect to the main body part 120 from 0 ° to 360 ° by the biaxial hinge device 1.

  FIG. 1 shows a state where the opening angle of the cover part 110 is set to 135 °. In general, in this state, the user visually recognizes the display surface 112 of the liquid crystal display 111 and performs an input operation using the keyboard 121 and the touch pad 122. FIG. 2A shows a state where the opening angle of the cover part 110 is set to 0 °, that is, a state where the cover part 110 is closed. In this state, the liquid crystal display 111 is shielded and protected from the outside, and the electronic device 100 is folded compactly, so that the electronic device 100 can be easily stored.

  FIG. 2B shows a state where the opening angle of the cover part 110 is set to 180 °. In this state, by placing both the cover part 110 and the main body part 120 flat on the desk, the backlash of the electronic device 100 at the time of an input operation to the touch panel provided on the liquid crystal display 111 is suppressed. Therefore, the state in which the opening angle of the cover part 110 is set to 180 ° is suitable for a method of using the electronic device 100 by an input operation to the touch panel provided on the liquid crystal display 111.

  FIG. 2C shows a state where the opening angle of the cover part 110 is set to 315 °. In this state, the liquid crystal is placed on the desk by placing one side of each of the cover part 110 and the main body part 120 provided with the biaxial hinge device 1 on top and the opposite side of each of the cover part 110 and the main body part 120 facing down. Falling during an input operation to the touch panel provided on the display 111 is suppressed. Therefore, when the opening angle of the cover unit 110 is set to 315 °, the usage method of the electronic device 100 that performs an input operation to the touch panel provided on the liquid crystal display 111, and the moving image displayed on the liquid crystal display 111 are appreciated. It is suitable for the usage method of the electronic device 100.

  FIG. 2D shows a state where the opening angle of the cover part 110 is set to 360 °. In this state, by placing the cover unit 110 on the top and the main body unit 120 on the desk, the input operation to the touch panel provided on the liquid crystal display 111 becomes easy. Therefore, the state in which the opening angle of the cover unit 110 is set to 360 ° is suitable for a method of using the electronic device 100 that performs an input operation to the touch panel provided on the liquid crystal display 111.

  3 is a perspective view showing an appearance of the biaxial hinge device 1 according to Embodiment 1 of the present invention, FIG. 4 is an exploded perspective view of the biaxial hinge device 1, and FIG. 5 is a front view of the biaxial hinge device 1. 6 is a perspective view showing an external appearance of the slide member 33. In FIG. 5, the slide member 33 is shown in an axial cross section. The biaxial hinge device 1 includes brackets 11 and 21, a first shaft member 12, a second shaft member 22, a first cam tube 13, a second cam tube 23, connecting members 31 and 34, a third shaft member 32, and a slide. The member 33 etc. are provided. The bracket 11 has a rectangular plate shape, and has a seat portion 11a to which the end portion of the first shaft member 12 is attached. The plate surface 11b is brought into contact with the contact portion of the cover portion housing 113, and a screw or the like is fastened. It is attached to the cover part housing | casing 113 with a tool. The bracket 21 has an L-shaped plate shape, and has a seat portion 21a to which the end portion of the second shaft member 22 is attached. The plate surface 21b is brought into contact with the contact portion of the main body housing 123, and a screw or the like. It attaches to the main-body part housing | casing 123 with a fastener.

  The first shaft member 12 has an attachment portion 12a at one end of the shaft body 12b. The attachment portion 12a is brought into contact with the seat portion 11a of the bracket 11, and is attached to the bracket 11 with a fastener such as a screw. The first shaft member 12 is restricted from rotating around the axis with respect to the bracket 11. The shaft body 12b has a flat surface in which a part of the peripheral surface is cut from one end side where the mounting portion 12a is provided to the tip portion 12c. The component inserted into the shaft body 12b is prevented from rotating by forming a flat surface that contacts the flat surface.

  The second shaft member 22 has a columnar attachment portion 22a at one end of the shaft body 22b. The attachment portion 22a is inserted into an attachment hole provided in the seat portion 21a of the bracket 21, and the tip of the attachment portion 22a is caulked. Attached to the bracket 21. Flat surfaces that are in contact with each other are formed on the peripheral surface of the mounting portion 22a and the inner peripheral surface of the mounting hole provided in the seat portion 21a, and the second shaft member 22 rotates about the axis with respect to the bracket 21. It is restrained. The shaft body 22b has a flat surface in which a part of the peripheral surface is cut from one end side where the attachment portion 22a is provided to the tip portion 22c. The components inserted into the shaft body 22b are prevented from rotating by forming a flat surface that comes into contact with the flat surface.

  The connecting member 31 has an oval shape, and has through holes at both ends in the longitudinal direction. In the connecting member 31, the shaft body 12 b of the first shaft member 12 is inserted into one through hole, and the shaft body 22 b of the second shaft member 22 is inserted into the other through hole, so that the first shaft member 12 and the second shaft member 22 are inserted. Are connected. Further, the distance between the axes of the first shaft member 12 and the second shaft member 22 is determined by the dimension between the centers of both through holes, and is kept constant. The first shaft member 12 and the second shaft member 22 are supported by the connecting member 31 so as to be rotatable around the axis. The connecting member 31 has a mounting hole for mounting the third shaft member 32 at the center, and a flat surface 31a is formed on the inner peripheral surface of the mounting hole. The two friction washers 41 are inserted into the shaft body 12 b so as to sandwich both surfaces of the connecting member 31. Similarly, the two friction washers 51 are inserted into the shaft body 22b so as to sandwich both surfaces of the connecting member 31. The friction washers 41 and 51 have a flat surface for preventing rotation on the inner peripheral surface.

  The first cam cylinder 13 has a cylindrical shape, and a U-shaped groove-shaped cam groove 13b is formed on the peripheral surface 13a. The cam groove 13b has a shape in which the peripheral surface 13a is wound in a spiral shape, and is provided over an angle slightly larger than a half circumference (180 ° around the central axis when viewed from the cylinder end). The first cam cylinder 13 is provided with a flat surface 13c on the inner peripheral surface, and when it is inserted into the shaft body 12b of the first shaft member 12, rotation around the axis is constrained by the shaft body 12b. And rotate around the axis. A cam groove 13b of the first cam cylinder 13 is provided on the peripheral side portion of the shaft body 12b in the first shaft member 12, and the cam groove 13b also rotates as the first shaft member 12 rotates about the axis. The cam groove 13b corresponds to the first guide portion of the present invention. The first cam cylinder 13 corresponds to the first cylinder of the present invention.

  Like the first cam cylinder 13, the second cam cylinder 23 has a cylindrical shape, and a U-shaped groove-shaped cam groove 23b is formed on the peripheral surface 23a. The cam groove 23b has a shape in which the peripheral surface 23a is wound spirally, and is provided over an angle slightly larger than a half circumference (180 ° around the central axis when viewed from the cylinder end). The second cam cylinder 23 is provided with a flat surface 23c on the inner peripheral surface, and when it is inserted into the shaft body 22b of the second shaft member 22, rotation around the axis is constrained by the shaft body 22b. And rotate around the axis. A cam groove 23b of the second cam cylinder 23 is provided on the peripheral side portion of the shaft body 22b in the second shaft member 22, and the cam groove 23b also rotates as the second shaft member 22 rotates about the axis. The cam groove 23b corresponds to the second guide portion of the present invention. The second cam cylinder 23 corresponds to the second cylinder of the present invention.

  The cam groove 13b and the cam groove 23b will be described in detail with reference to FIG. The cam groove 13b and the cam groove 23b are provided in a shape in which the circumferential surface 13a and the circumferential surface 23a are spirally wound in a reverse manner. Further, the lead and the lead angle of the cam groove 13b and the cam groove 23b are the same. The lead is the distance in the axial direction when the spiral makes one turn, and the lead angle is the angle of inclination of the spiral from the axial vertical section. With the first cam cylinder 13 inserted into the shaft body 12b of the first shaft member 12 and the second cam cylinder 23 inserted into the shaft body 22b of the second shaft member 22, the positive cam groove 13b and the cam groove 23b The distance L1 and the distance L2 from the cylinder end of each location are made equal.

  The lead angle of the cam groove 13b and the cam groove 23b may be provided in the range of 20 ° to 45 °, for example, and is preferably about 30 °. As will be described later, the protrusion 33c and the protrusion 33d of the slide member 33 are fitted in the cam groove 13b and the cam groove 23b, respectively, and the first cam cylinder 13 and the second cam cylinder 23 have a fitting tolerance. Play in the circumferential direction occurs. When the lead angle is smaller than 20 °, the play increases and the shift of the rotation angle between the first shaft member 12 and the second shaft member 22 increases. By setting the lead angle to 20 ° or more, the play is reduced, and the shift of the rotation angle between the first shaft member 12 and the second shaft member 22 can be suppressed to a small value. On the other hand, when the lead angle is larger than 45 °, the resistance generated when the protrusion 33c and the protrusion 33d move through the cam groove 13b and the cam groove 23b increases, and the cover 110 is difficult to open. By setting the lead angle to 45 ° or less, resistance during rotation of the first shaft member 12 and the second shaft member 22 is suppressed, and the cover portion 110 can be opened smoothly. Considering the tolerance of the rotational angle deviation of the first shaft member 12 and the second shaft member 22 and the ease of opening the cover portion 110, the lead angle of the cam groove 13b and the cam groove 23b should be about 30 °. Is preferred.

  The connecting member 34 has an oval shape and has through holes at both ends in the longitudinal direction. In the connecting member 34, the shaft body 12b of the first shaft member 12 is inserted into one through hole, and the shaft body 22b of the second shaft member 22 is inserted into the other through hole, so that the first shaft member 12 and the second shaft member 22 are inserted. Are connected. Further, the distance between the axes of the first shaft member 12 and the second shaft member 22 is determined by the dimension between the centers of both through holes, and is kept constant. The dimension between the centers of the through holes provided at both ends in the longitudinal direction of the connecting member 34 is the same as the dimension between the centers of the through holes provided at both ends in the longitudinal direction of the connecting member 31, and the first shaft member 12. And the 2nd shaft member 22 is arrange | positioned so that each axis line may become parallel.

  The first shaft member 12 and the second shaft member 22 are supported by the connecting member 34 so as to be rotatable around the axis. The connecting member 34 has a mounting hole for mounting the third shaft member 32 at the center, and a flat surface 34a is formed on the inner peripheral surface of the mounting hole. A friction washer 42 equivalent to the friction washer 41 is inserted into the shaft body 12b on the first cam cylinder 13 side of the connecting member 34. Similarly, a friction washer 52 equivalent to the friction washer 51 is provided in the shaft body. 22b is inserted. On the opposite side of the connecting member 34 from the first cam cylinder 13, a positioning washer 43, a plurality of disc springs 44, and a washer 45 are inserted into the shaft body 12b. A positioning washer 53, a plurality of disc springs 54, and a washer 55 are inserted into the shaft body. 22b is inserted. The first shaft member 12 and the second shaft member 22 retain their tip portions 12c and tip portions 22c in a hook shape to prevent them from coming off.

  The third shaft member 32 has a flat surface 32a having a peripheral surface cut out over substantially the entire length in the axial direction. The end portion of the third shaft member 32 is attached by being attached to an attachment hole provided in the center of each of the connecting member 31 and the connecting member 34. The third shaft member 32 has its flat surface 32a abutting against the flat surface 31a on the connecting member 31 side and the flat surface 34a on the connecting member 34 side, so that rotation about the axis is constrained with respect to the connecting member 31 and the connecting member 34. Is done. The third shaft member 32 is disposed in the center between the axes of the first shaft member 12 and the second shaft member 22 in parallel with the first shaft member 12 and the second shaft member 22.

  The slide member 33 has a cylindrical shape, and has a protrusion 33c on the peripheral surface 33a and a protrusion 33d (see FIG. 6) on the peripheral surface 33b. The peripheral surface 33 a has a curved concave shape along the peripheral surface 13 a of the first cam cylinder 13. Similarly, the peripheral surface 33 b has a curved concave shape along the peripheral surface 23 a of the second cam cylinder 23. The protrusion 33c has a truncated cone shape and is fitted in the cam groove 13b. Similarly, the protrusion 33d has a truncated cone shape and is fitted into the cam groove 23b. The slide member 33 is inserted into the third shaft member 32, and a flat surface 33 e provided on the inner peripheral surface abuts on the flat surface 32 a of the third shaft member 32, and is about the axis with respect to the third shaft member 32. Rotation is constrained. The slide member 33 is slidably supported by the shaft body of the third shaft member 32 along the first shaft member 12 and the second shaft member 22. In addition, the protrusion part 33c and the protrusion part 33d are equivalent to the fitting part of this invention.

  The positioning washer 43 and the positioning washer 53 have a flat surface for preventing rotation on the inner peripheral surface, and a convex portion is formed on the surface facing the connecting member 34. At the edges of the through holes provided at both ends in the longitudinal direction of the connecting member 34, there are provided recesses into which the protrusions fit. The convex portions provided on the positioning washer 43 and the positioning washer 53 begin to fit into the concave portions provided on the connecting member 34 at an angle immediately before setting the opening angle of the cover portion 110 to 0 ° (for example, an angle of about 5 °). . Further, the convex portion provided in the positioning washer 43 and the positioning washer 53 is another concave portion provided in the connecting member 34 at an angle immediately before setting the opening angle of the cover portion 110 to 360 ° (for example, an angle of about 355 °). Begin to fit in. The cover part 110 and the main body part 120 receive a biasing force in a direction in which the opening angle becomes 0 ° or 360 ° based on the pressing force of the disc springs 44 and 54.

  Next, the operation of the biaxial hinge device 1 will be described. FIG. 7 is a perspective view showing an appearance of the biaxial hinge device 1 in a state where the biaxial hinge device 1 is rotated at predetermined angles.

  FIG. 7A shows a state in which the rotation angle of the first shaft member 12 and the second shaft member 22 is 0 °. In this state, the electronic device 100 using the biaxial hinge device 1 is in a state where the opening angle of the cover portion 110 is set to 0 °, that is, the cover portion 110 is closed. The slide member 33 is positioned on the distal end portion 12c side of the first shaft member 12 on the third shaft member 32, and moves toward the flange 11 when the cover portion 110 is opened. When the first cam cylinder 13 and the second cam cylinder 23 are assembled so that both cylinder ends are positioned oppositely, the slide member 33 is positioned on the flange 11 side on the third shaft member 32, and the cover portion 110. As the opening is opened, the first shaft member 12 moves toward the tip 12c side.

  FIG. 7B shows a state in which the rotation angles of the first shaft member 12 and the second shaft member 22 are 67.5 degrees each and are opened 135 degrees as a whole. The slide member 33 is in a position slid on the third shaft member 32 from the distal end portion 12c side of the first shaft member 12 to the flange 11 side. As described above, the cam groove 13b provided in the first shaft member 12 and the cam groove 23b provided in the second shaft member 22 are spirally wound around the circumferential surface 13a and the circumferential surface 23a, respectively. The pitch is the same. For this reason, the rotation angles of the first shaft member 12 and the second shaft member 22 are synchronized and rotate by the same angle. In this state, the electronic device 100 using the biaxial hinge device 1 is in a state where the opening angle of the cover 110 is set to 135 °.

  FIG. 7C shows a state in which the rotation angles of the first shaft member 12 and the second shaft member 22 are 90 degrees each and are opened 180 degrees as a whole. The slide member 33 is in a position where it is slid further on the third shaft member 32 toward the flange 11 side. The rotation angles of the first shaft member 12 and the second shaft member 22 are synchronized and rotate by the same angle. In this state, the electronic device 100 using the biaxial hinge device 1 is in a state where the opening angle of the cover part 110 is set to 180 °, and the cover part 110 and the main body part 120 become flat.

  FIG. 7D shows a state where the rotation angles of the first shaft member 12 and the second shaft member 22 are 157.5 ° each and are opened 315 ° as a whole. The slide member 33 is in a position where it is slid further on the third shaft member 32 toward the flange 11 side. The rotation angles of the first shaft member 12 and the second shaft member 22 are synchronized and rotate by the same angle. In this state, the electronic device 100 using the biaxial hinge device 1 is in a state where the opening angle of the cover portion 110 is set to 315 °.

  FIG. 7E shows a state in which the rotation angles of the first shaft member 12 and the second shaft member 22 are 180 degrees each and are opened 360 degrees as a whole. The slide member 33 is in a position where it is slid further on the third shaft member 32 toward the flange 11 side. The rotation angles of the first shaft member 12 and the second shaft member 22 are synchronized and rotate by the same angle. In this state, the electronic device 100 using the biaxial hinge device 1 is in a state where the opening angle of the cover portion 110 is set to 360 °, and the cover portion 110 and the main body portion 120 are completely folded back.

  7A to 7E, the frictional force between the connecting member 31 and the friction washer 41 generated based on the pressing force of the disc spring 44 and the frictional force between the connecting member 34 and the friction washer 42 are generated. The rotation angle of the first shaft member 12 is held at an arbitrary angle. Similarly, the rotation angle of the second shaft member 22 is determined by the frictional force between the connecting member 31 and the friction washer 51 generated based on the pressing force of the disc spring 54 and the frictional force between the connecting member 34 and the friction washer 52. Is held at an arbitrary angle.

  FIG. 8 is a perspective view showing an appearance of the electronic device 100 using the biaxial hinge device 1 in a state where the electronic device 100 is opened by 315 °. When placing the biaxial hinge device 1 on the desk with the cover 110 and the main body 120 on one side facing up and the cover 110 and the main body 120 facing opposite sides, the connecting member 31 and the connecting member The longitudinal direction of 34 becomes horizontal, and the inclination angles of the cover part 110 and the main body part 120 become the same. For this reason, it becomes difficult for the electronic device 100 to fall down, the appearance is stable, and the design is good.

  As described above, according to the present embodiment, the cam groove 13 b of the first cam cylinder 13 is provided on the peripheral side portion of the first shaft member 12, and the second cam cylinder 23 is provided on the peripheral side portion of the second shaft member 22. A cam groove 23b is provided, and the first shaft member 12 and the second shaft member 22 are arranged in parallel. The slide member 33 having the projection 33c and the projection 33d fitted in the cam groove 13b and the cam groove 23b slides along the first shaft member 12. The cam groove 13b and the cam groove 23b are formed in a spiral shape reversely wound. When the first shaft member 12 is rotated, the protrusion 33c is guided by the spiral cam groove 13b, and the slide member 33 slides along the first shaft member 12. By sliding the slide member 33, the projection 33 d fitted into the cam groove 23 b formed in the reversely wound spiral shape slides along the first shaft member 12, thereby synchronizing with the rotation of the first shaft member 12. Thus, the second shaft member 22 can be rotated.

  Further, since the projection 33c is fitted in the spiral cam groove 13b and the projection 33d is fitted in the cam groove 23b, it is less likely to cause backlash compared to backlash caused by the connection using the connection gear. . Further, by widening the groove widths of the cam groove 13b and the cam groove 23b, the outer dimensions of the protrusion 33c and the protrusion 33d are increased and the strength is increased, so that the durability can be improved.

  Further, by providing the first cam cylinder 13 and the second cam cylinder 23 having cam grooves formed on the peripheral surface separately from the first shaft member 12 and the second shaft member 22, each part can be easily processed. Thus, the manufacturing cost can be reduced.

  In addition, the connecting member 31 and the connecting member 34 support the first shaft member 12 and the second shaft member 22 rotatably, and also support the third shaft member 32 that supports the slide member 33 slidably. The structure of the mechanism part is simplified.

(Embodiment 2)
In the first embodiment, the case where the cam grooves are formed about 180 ° in the first cam cylinder 13 and the second cam cylinder 23 is shown, but in the second embodiment, the cam grooves are formed about 90 °. FIG. 9 is a perspective view showing the appearance of the first cam cylinder 13 and the second cam cylinder 23 of the biaxial hinge device 1 according to Embodiment 2 of the present invention. The configuration and operation of the biaxial hinge device 1 other than the first cam barrel 13 and the second cam barrel 23 in the second embodiment are the same as the configuration and operation of the biaxial hinge device 1 in the first embodiment. Description is omitted for the sake of brevity.

  The first cam cylinder 13 shown in FIG. 9 has a cylindrical shape like the first cam cylinder in the first embodiment, and a U-shaped groove-shaped cam groove 13b is formed on the peripheral surface 13a. The cam groove 13b has a shape in which the peripheral surface 13a is wound in a spiral shape, and is provided over an angle that is slightly larger than ¼ circumference (90 ° around the central axis when viewed from the cylinder end). The first cam cylinder 13 is provided with a flat surface 13c on the inner peripheral surface, and when it is inserted into the shaft body 12b of the first shaft member 12, rotation around the axis is constrained by the shaft body 12b. And rotate around the axis (see FIG. 4). A cam groove 13b of the first cam cylinder 13 is provided on the peripheral side portion of the shaft body 12b in the first shaft member 12, and the cam groove 13b also rotates as the first shaft member 12 rotates about the axis.

  Like the first cam cylinder 13, the second cam cylinder 23 has a cylindrical shape, and a U-shaped groove-shaped cam groove 23b is formed on the peripheral surface 23a. The cam groove 23b has a shape in which the peripheral surface 23a is spirally wound, and is provided over an angle that is slightly larger than ¼ circumference (90 ° around the central axis when viewed from the cylinder end). The second cam cylinder 23 is provided with a flat surface 23c on the inner peripheral surface, and when it is inserted into the shaft body 22b of the second shaft member 22, rotation around the axis is constrained by the shaft body 22b. And rotate around the axis (see FIG. 4). A cam groove 23b of the second cam cylinder 23 is provided on the peripheral side portion of the shaft body 22b in the second shaft member 22, and the cam groove 23b also rotates as the second shaft member 22 rotates about the axis.

  The cam groove 13b and the cam groove 23b are provided in a shape in which the circumferential surface 13a and the circumferential surface 23a are spirally wound in a reverse manner. Further, the lead and the lead angle of the cam groove 13b and the cam groove 23b are the same. Similar to the first embodiment, the lead angles of the cam groove 13b and the cam groove 23b may be provided in a range of 20 ° to 45 °, for example, and preferably about 30 °. Since the cam groove 13b and the cam groove 23b are provided for ¼ circumference, the biaxial hinge device 1 can be opened and closed from 0 ° to 180 °. Also in the electronic device 100 that uses the opening angle between the cover part 110 and the main body part 120 up to 180 °, the cam groove 13b and the cam groove 23b are provided over an angle that is slightly larger than ¼ circumference. The unit 120 can be rotated in synchronization.

(Embodiment 3)
In the first and second embodiments, the case where the cam grooves are formed in the first cam cylinder 13 and the second cam cylinder 23 has been described. However, in the third embodiment, a cam having a ridge shape is formed. FIG. 10 is a front view of the biaxial hinge device 1 according to Embodiment 3 of the present invention, and FIG. 11 is a perspective view showing the appearance of the slide member 33. In FIG. 10, the slide member 33 is shown in an axial cross section. The configuration and operation of the biaxial hinge device 1 other than the first cam barrel 13, the second cam barrel 23, and the slide member 33 in the third embodiment are the same as the configuration and operation of the biaxial hinge device 1 in the first embodiment. For the sake of brevity, the description is omitted.

  The first cam cylinder 13 has a cylindrical shape similar to the first cam cylinder in the first embodiment. The first cam cylinder 13 is formed with a convex cam 61 on the peripheral surface 13a. The cam 61 has a shape in which the circumferential surface 13a is wound in a spiral shape, and is provided over an angle slightly larger than a half circumference (180 ° around the central axis when viewed from the cylinder end). The first cam cylinder 13 is provided with a flat surface 13c on the inner peripheral surface, and when it is inserted into the shaft body 12b of the first shaft member 12, rotation around the axis is constrained by the shaft body 12b. And rotate around the axis (see FIG. 4). A cam 61 of the first cam cylinder 13 is provided on the peripheral side portion of the shaft body 12 b in the first shaft member 12, and the cam 61 rotates as the first shaft member 12 rotates about the axis. The cam 61 corresponds to the first guide portion of the present invention.

  The second cam cylinder 23 has a cylindrical shape like the second cam cylinder in the first embodiment. The second cam cylinder 23 has a ridge-shaped cam 62 formed on the peripheral surface 23a. The cam 62 has a shape in which the circumferential surface 23a is wound in a spiral shape, and is provided over an angle slightly larger than a half circumference (180 ° around the central axis when viewed from the cylinder end). The second cam cylinder 23 is provided with a flat surface 23c on the inner peripheral surface, and when it is inserted into the shaft body 22b of the second shaft member 22, rotation around the axis is constrained by the shaft body 22b. And rotate around the axis (see FIG. 4). A cam 62 of the second cam cylinder 23 is provided on the peripheral side portion of the shaft body 22 b in the second shaft member 22, and the cam 62 rotates as the second shaft member 22 rotates about the axis. The cam 62 corresponds to the second guide portion of the present invention.

  The cam 61 and the cam 62 are provided in a shape in which the peripheral surface 13a and the peripheral surface 23a are spirally wound in a reverse manner. Further, the lead and the lead angle of the cam 61 and the cam 62 are the same. As in the first embodiment, the lead angle of the cam 61 and the cam 62 may be provided in a range of 20 ° to 45 °, for example, and is preferably about 30 °. The first cam cylinder 13 is inserted into the shaft body 12b of the first shaft member 12, and the second cam cylinder 23 is inserted into the shaft body 22b of the second shaft member 22 so that the cam 61 and the cam 62 face each other. It is comprised so that the distance from each cylinder end may become equal.

  The slide member 33 has a cylindrical shape, and has a groove 71b on the peripheral surface 71a and a groove 72b on the peripheral surface 72a. The circumferential surface 71 a faces the circumferential surface 13 a of the first cam cylinder 13, and the circumferential surface 72 a faces the circumferential surface 23 a of the second cam cylinder 23. The groove portion 71 b has a U-shaped groove shape and is fitted to the cam 61. Similarly, the groove portion 72 b has a U-shaped groove shape and is fitted to the cam 62. The slide member 33 is inserted into the third shaft member 32, and a flat surface 33 e provided on the inner peripheral surface abuts on the flat surface 32 a of the third shaft member 32, and is about the axis with respect to the third shaft member 32. The rotation is constrained (see FIG. 4). The slide member 33 is slidably supported by the shaft body of the third shaft member 32 along the first shaft member 12 and the second shaft member 22. In addition, the groove part 71b and the groove part 72b are equivalent to the fitting part of this invention.

  As described above, the convex cam 61 is formed on the first cam cylinder 13, the convex cam 62 is formed on the second cam cylinder 23, and the groove 71b and the groove 72b are provided on the slide member 33. The 1 axis member 12 and the 2nd axis member 22 can be rotated synchronously, and 0 degree to 360 degree opening / closing operation | movement can be performed. Furthermore, the cam 61 and the cam 62 may be formed over an angle that is slightly larger than a quarter of a circle (90 ° around the central axis when viewed from the cylinder end), as in the second embodiment.

  In addition, since the ridge-shaped cam 61 formed on the first cam cylinder 13 and the groove 71b are fitted, and the ridge-shaped cam 62 formed on the second cam cylinder 23 and the groove 72b are fitted, The backlash is less likely to occur compared to the backlash generated in the mechanism using the connecting gear. In addition, by using a wide ridge shape, the strength of the cam 61 and the cam 62 is increased, and durability can be improved.

(Modification)
In the above-described embodiment, the third shaft member 32 is arranged in the center between the axes of the first shaft member 12 and the second shaft member 22 in parallel with the first shaft member 12 and the second shaft member 22. However, it may be arranged at a position offset from the center. When the distance between the axes of the first shaft member 12 and the second shaft member 22 is small, and the third shaft member 32 cannot be disposed between the first shaft member 12 and the second shaft member 22 due to the convenience of component dimensions and strength. Is preferred.

  Further, the cam groove 13b and the cam groove 23b in the first embodiment insert the first cam cylinder 13 into the shaft body 12b of the first shaft member 12, and the second cam cylinder 23 as the shaft body 22b of the second shaft member 22. The example in which the distance L1 and the distance L2 from the cylinder end of each of the cam groove 13b and the cam groove 23b facing each other in the cam groove 13b and the cam groove 23b are made equal is shown. Good. The first shaft member 12 and the second shaft member 22 can be synchronized by providing the slide member 33 with the projection 33c and the projection 33d fitted in the cam groove 13b and the cam groove 23b being equally offset in the axial direction. It is possible to rotate.

  In the above-described embodiment, the U-shaped groove is used as an example of the shape of each groove formed in the first cam cylinder 13, the second cam cylinder 23, and the slide member 33. Other shapes may be used. Further, the shape of the protrusion 33c and the protrusion 33d formed on the slide member 33 is a truncated cone, but the present invention is not limited to this, and other shapes such as a cylinder may be used.

  The present invention is not limited to the above-described embodiment, but covers the technical scope of the invention described in the claims and the equivalent scope thereof.

DESCRIPTION OF SYMBOLS 1 Biaxial hinge apparatus 12 1st shaft member 13 1st cam cylinder (1st cylinder)
13b Cam groove (first guide)
22 Second shaft member 23 Second cam cylinder (second cylinder)
23b Cam groove (second guide)
31 connecting member 32 third shaft member 33 slide member 33c, 33d protrusion (fitting portion)
34 connecting member 61 cam (first guide)
62 Cam (second guide)
71b, 72b Groove (fitting part)

Claims (6)

A first shaft member provided with a first guide portion on a peripheral side portion;
A second shaft member disposed in parallel with the first shaft member and provided with a second guide portion on a peripheral side portion;
In the biaxial hinge device having a fitting portion fitted to the first guide portion and the second guide portion, and a slide member supported so as to be slidable in the axial direction of the first shaft member,
The biaxial hinge device according to claim 1, wherein the first guide portion and the second guide portion are formed in a spiral shape reversely wound.   The biaxial hinge device according to claim 1, wherein the first guide part and the second guide part are provided in a groove shape.   The biaxial hinge device according to claim 1, wherein the first guide part and the second guide part are provided in a convex shape. A first cylindrical body inserted into the shaft body of the first shaft member and having the first guide portion formed on a peripheral surface thereof;
4. The apparatus according to claim 1, further comprising: a second cylindrical body that is inserted into the shaft body of the second shaft member and has the second guide portion formed on a peripheral surface thereof. 5. Biaxial hinge device. A connecting member that rotatably supports and connects the first shaft member and the second shaft member;
The biaxial hinge according to any one of claims 1 to 4, further comprising a third shaft member supported by the connecting member and slidably supporting the slide member. apparatus.   6. The biaxial hinge device according to claim 1, wherein the first guide portion and the second guide portion have a spiral lead angle of 20 ° to 45 °.

Images