JP5060468B2 - Rotating hinge unit and portable terminal equipped with the same - Google Patents

Description

  The present invention relates to a rotary hinge unit used for a portable terminal, and more particularly to a rotary hinge unit capable of realizing a reduction in the size of a rotary shaft while maintaining a sufficient torque value, and a portable terminal including the rotary hinge unit.

In a rotary hinge used for a portable terminal, it is common to obtain sliding torque, click torque, and the like by using elastic force generated in the rotation axis direction.
Such an elastic force is generally obtained by bringing a fixed cam and a rotating cam into contact with each other by incorporating an elastic material such as a coil spring.

  Many technologies have also been created from the viewpoint of reducing the size of the rotary hinge. The technical barriers in reducing the size of the rotating hinge were the viewpoints of reducing the number of parts from a cost standpoint, maintaining a constant torque value, durability during repeated use, and securing space for harness wiring. .

FIG. 8 is an exploded perspective view showing an example of a general rotary hinge unit currently used. FIG. 9 is a front view showing a state in which the rotary hinge unit shown in FIG. 8 is assembled. The rotary hinge unit shown in FIG. 8 has a base angle 81 and an LCD plate 84 having a bracket for fixing a monitor or the like, four disc springs 86 between the base angle 81 and the LCD plate, and both ends thereof. A fixed cam 82 and a rotating ring 83 are arranged. These and the ring 88 are inserted through the rotary shaft 85. Further, the stopper 88 is fixed to the base angle 81 and regulates the rotation angle.
Such a rotary hinge unit is one of the most realistic mechanisms because it maintains a constant torque value while minimizing the number of components and enables wiring of the harness.

  However, the rotating hinge unit shown in FIG. 8 has a constant torque value, durability in repeated use, and harness wiring for obtaining a hinge unit that is smaller than the conventional torque unit and durability of the hinge part. There was a limit from the viewpoint of securing space. That is, in order to reduce the diameter of the rotating shaft, it is necessary to reduce the diameter of the disc spring, and it is also necessary to reduce the contact surface of the fixed cam 82. Here, since the torque value depends on the contact area of the fixed cam 82 in addition to the elastic force of the spring, the conventional torque value cannot be maintained if the contact area is reduced as the size is reduced. In addition, it has been difficult to reduce the diameter of the rotary shaft from the viewpoint of maintaining durability by repeated use and securing the space for harness wiring.

JP 2002-155923 A JP 2004-360758 A JP 2003-304316 A JP 2005-54891 A WO2003 / 78854

  An object of the present invention is to realize a reduction in the diameter of a rotary shaft while maintaining a conventional torque value in a rotary hinge unit used in a portable terminal.

The present invention employs the following configuration in order to solve the above problems.
(1) The present invention is a rotary hinge unit used for a portable terminal, and includes at least a base angle, a cam holder case, a cam holder fitted in the cam holder case, and a plate, Each of the members is inserted through a rotating shaft in order through a through hole formed in the center of the plan view, the base angle is rotatable with respect to the rotating shaft, and the cam holder case, the cam holder and the plate are connected to the rotating shaft. The cam holder is fitted in the cam holder case, and a torque generating mechanism using two or more leaf springs is divided with the rotational axis being axially symmetrical at the contact portion between the cam holder and the plate. It is arranged.

(2) The cam holder has a concave groove for accommodating the leaf spring, and the concave groove is arranged on the contact surface side with the plate and the rotational axis is axisymmetric. (1) It is a rotation hinge unit as described.
(3) The rotating hinge unit according to (1) or (2), wherein at least the basic shape of the base angle, the cam holder case, and the cam holder is a plate-like body.

(4) A cylindrical member is formed on the outer periphery of the through-hole on the rotating shaft base side of the cam holder case and the cam holder, and a convex portion is formed on one or more portions on the tip peripheral surface of any one of the cylindrical members. The rotating hinge unit according to any one of the above (1) to (3), wherein one or more concave portions that engage with the convex portions are formed on the plane of the base angle that abuts. is there.
(5) A portable terminal including the rotary hinge unit described in any one of (1) to (4) above.

  By arranging the leaf springs so that the rotational axis is axisymmetric and stress is generated in the axial direction, there is an effect that the diameter of the rotational shaft is reduced while maintaining the conventional torque value.

  Hereinafter, a rotary hinge unit according to an embodiment of the present invention will be described with reference to the drawings. The embodiment described below is an example of the present invention, and the configuration of the present invention is not limited to the following.

FIG. 1 is an exploded perspective view showing a rotary hinge unit according to the present embodiment.
As shown in FIG. 1, the rotary hinge unit according to this embodiment includes a base angle 30, a cam holder case 40, a cam holder 50, and a plate 70. The basic shape of each member is a plate-like body, and a through hole is formed in the center in plan view, and is inserted through the rotary shaft 20 through the through hole.

The base angle 30 is rotatable with respect to the rotating shaft 20. The cam holder case 40, the cam holder 50, and the plate 70 rotate in synchronization with the rotation shaft.
The cam holder 50 is formed with concave grooves on the left and right in axial symmetry, and a total of four leaf springs 60 are divided and arranged in the concave groove.
A stopper 7 is fixed to the cam holder case 40, and the stopper 7 comes into contact with a protruding portion formed at the base portion of the rotating shaft 20, thereby limiting the rotation angle of the rotary hinge.

FIG. 2 is a view for explaining the rotary shaft 20 used in the rotary hinge unit. (A) is a top view, (b) is a front view, (c) shows CC sectional view taken on the line in (a).
As shown in FIG. 2A, the upper end of the rotating shaft 20 used in the present embodiment has a deformed octagonal shape. The upper end is caulked to the through hole of the plate 70.
As shown in FIG. 2B, the central portion 24 of the rotating shaft 20 has an oval cross section. The central portion 24 is fitted around the through holes of the cam holder case 40 and the cam holder 50.

Further, a protrusion 23 is formed at one end of the base 25 of the rotating shaft. The protrusion 23 comes into contact with the stopper 7. Such a mechanism will be described later.
As shown in FIG. 2C, the shaft center of the rotating shaft 20 is a hollow portion 22. This is a space for harness wiring. For example, when this product is used as a biaxial hinge of a cellular phone, a harness for electrically connecting the battery of the main body and the monitor can be disposed in the hollow portion 22.

FIG. 3 is a view for explaining a base angle 30 used in the rotary hinge unit. (A) is a front view, (b) is a bottom view, and (c) is a plan view.
As shown in FIGS. 3A and 3B, the base angle 30 used in this embodiment is a plate-like body. As shown in FIGS. 3B and 3C, a through hole is formed in the center in plan view.

As shown in FIG. 3C, a contact surface with a cam holder 50 described later is formed on the outer periphery of the through hole. Concave portions 33 are formed at two locations on the contact surface, and click torque is generated by fitting with concave portions formed on the cam holder 50 described later. In the flat portion 34, sliding torque is generated when the cam holder 50 is pressed by a leaf spring. An inclined surface 35 is formed between the flat portion 34 and the concave portion 33.
Further, as shown in FIGS. 3B and 3C, the base angle 30 is formed with a through hole 36 for fixing the stopper 7.

FIG. 4 is a view for explaining a cam holder case 40 used in the rotary hinge unit. (A) is a top view, (b) is a front view, (c) is CC sectional view taken on the line of Fig.4 (a).
As shown in FIG. 4A, the basic shape of the cam holder case 40 used in this embodiment is a plate-like body. As shown in FIGS. 4A and 4C, a through hole 42 is formed in the center in plan view.

4B and 4C, the periphery of the through hole on the rotating shaft base side of the cam holder case 40 protrudes in a cylindrical shape. By taking such a structure, a clearance can be provided between the base angle 30 and the storage portion 41 of the cam holder case 40.
Further, as shown in FIG. 4C, the inside of the cam holder case 40 is a housing portion 41 of a cam holder 50 formed hollow. The storage portion 41 is formed to have a size that allows the cam holder 50 to be fitted and the cam holder 50 to operate in the direction of the rotation axis.

FIG. 5 is a view for explaining a cam holder 50 used in the rotary hinge unit. (A) is a top view, (b) is CC sectional view taken on the line, (c) is a bottom view.
As shown in FIG. 5A, the basic shape of the cam holder 50 used in this embodiment is a plate-like body. As shown in FIGS. 5A to 5C, a through hole 52 is formed in the center in plan view. The cross-sectional shape of the through hole is formed in a shape that fits the cross-section of the center portion 24 of the oval shape on the rotary shaft 20. By exhibiting such a shape, it rotates in synchronization with the rotating shaft 20. Further, when the cam holder 50 rotates in synchronization with the rotary shaft 20, the above-described cam holder case 40 fitted on the cam holder 50 also rotates in synchronization.

Further, as shown in FIG. 5B, a cylindrical member 56 is formed around the through hole on the rotating shaft base side of the cam holder 50.
Further, as shown in FIGS. 5A and 5B, concave leaf spring accommodating portions 51, 51 are formed on the left and right of the through hole 52 on the plane of the cam holder 50. In the leaf spring accommodating portion 51, a leaf spring 60 (not shown) is divided and arranged.

Locking portions 55 for hooking the leaf springs 60 are formed on the left and right central sidewalls of the leaf spring storage portion 51.
Further, as shown in FIG. 5C, convex portions 54 and 54 are formed at two axially symmetrical positions on the peripheral surface of the tip of the cylindrical member 56 of the cam holder 50. Further, flat portions 53 are formed on the peripheral surface of the tip of the cylindrical member 56. An inclined surface 57 is formed between the flat portion 53 and the convex portion 54.

  The inside of the protrusion is a storage portion 41 of a cam holder 50 formed in a hollow shape. The storage portion 41 is formed to have a size that allows the cam holder 50 to be fitted and the cam holder 50 to operate in the direction of the rotation axis.

  FIG. 6 is a plan view showing a leaf spring 60 used in the rotary hinge unit. As shown in FIG. 6, notches 61 and 61 are formed in the center of the side surface of the leaf spring 60, and are structured to be hooked on the locking portion 55 of the cam holder 50. In this embodiment, four leaf springs are divided and arranged, but the number can be changed according to a desired torque value. The elastic material is not limited to a leaf spring. For example, a coil spring or a disc spring may be used.

  The cam holder 50 is always pressed toward the rotating shaft base by the leaf spring 60. By rotating the rotating shaft from the state in which the concave portion 33 of the base angle 30 and the convex portion 54 of the cam holder 50 are fitted, the convex portion 54 of the cam holder 50 rotates and moves on the flat portion 34 of the base angle 30. A sliding torque is generated by pressing. Thereafter, the convex portion 54 of the cam holder 50 is sucked by the inclined surface 35 of the base angle 30, and the concave portion 33 of the base angle 30 and the convex portion 54 of the cam holder 50 are fitted with a click feeling at a rotation angle of 180 degrees. Match.

FIG. 7 is a front view of the rotary hinge unit in which the above-described members, that is, the base angle 30, the cam holder case 40, the cam holder 50, the leaf spring 60, and the plate 70 are assembled.
The shaft diameter (l) of the rotating shaft in the rotating hinge unit according to the present embodiment is φ4.9 mm, which is smaller than the shaft diameter 5.6 mm of the conventional rotating hinge unit. Further, the generated torque values are substantially the same, and an equal pressing force can be generated on the left and right of the rotating shaft, so that the occurrence of shaft shake or the like can be suppressed.

It is a disassembled perspective view which shows the rotation hinge unit which concerns on this embodiment. It is a figure for demonstrating the rotating shaft used for the said rotation hinge unit. (A) is a top view, (b) is a front view, (c) shows CC sectional view taken on the line in (a). It is a figure for demonstrating the base angle used for the said rotation hinge unit. (A) is a front view, (b) is a bottom view, and (c) is a plan view. It is a figure for demonstrating the cam holder case used for the rotation hinge unit which concerns on this embodiment. (A) is a top view, (b) is a front view, (c) is CC sectional view taken on the line of Fig.4 (a). It is a figure for demonstrating the cam holder used for the rotation hinge unit which concerns on this embodiment. (A) is a top view, (b) is CC sectional view taken on the line, (c) is a bottom view. It is a top view which shows the leaf | plate spring used for the rotation hinge unit which concerns on this embodiment. It is a front view which shows the state which assembled the rotation hinge unit shown to this embodiment. It is a disassembled perspective view which shows an example of the conventional rotary hinge unit. It is a front view which shows the state which assembled the rotation hinge unit shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Rotating hinge unit 20 Rotating shaft 30 Base angle 33 Concave part 34 Plane part 40 Cam holder case 50 Cam holder 60 Leaf spring 70 Plate

Claims (5)

A rotary hinge unit for use in a mobile terminal, comprising at least a base angle, a cam holder case, a cam holder fitted in the cam holder case, and a plate, and the center of each member in plan view The base angle is rotatable with respect to the rotating shaft, and the cam holder case, the cam holder and the plate are rotatable in synchronization with the rotating shaft. The cam holder is fitted in the cam holder case, and a torque generating mechanism using two or more leaf springs is divided and arranged with the rotational axis as axial symmetry at the contact portion between the cam holder and the plate. Rotating hinge unit. The said cam holder has a ditch | groove which accommodates the said leaf | plate spring, This ditch | groove is a contact surface side with the said plate, and is arrange | positioned by making the rotating shaft axisymmetric. Rotating hinge unit. The rotary hinge unit according to claim 1 or 2, wherein at least a basic shape of the base angle, the cam holder case, and the cam holder is a plate-like body. A cylindrical member is formed on the outer periphery of the through hole on the rotating shaft base side of the cam holder case and the cam holder, and a convex portion is formed at one or more portions on the peripheral surface of the tip of any one of the cylindrical members and comes into contact therewith. The rotary hinge unit according to any one of claims 1 to 3, wherein one or more concave portions that engage with the convex portions are formed on a plane of a base angle. A portable terminal comprising the rotary hinge unit according to any one of claims 1 to 4.

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