WO2013157670A1 - Haptic actuator - Google Patents

Description

Haptic actuator

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a haptic actuator, and more particularly, to a haptic actuator that is embedded in an electronic device that needs to generate vibration, such as a portable terminal, to generate vibration by interaction between a coil and a magnet.

In general, ringtones and vibrations are widely used for incoming calls in communication devices.

In order to vibrate, it is common to drive a small vibration generating device so that the driving force is transmitted to the case of the device so that the whole device can vibrate.

The vibration generating device, which is one of the receiving means that is applied to communication devices such as mobile phones, is a component that converts electrical energy into mechanical vibration by using the principle of electromagnetic force. .

Such a vibration generating device is widely used for the purpose of informing the reception of a mobile phone, etc. In recent years, it is also installed in a game device to inform the user of the progress of the game or mounted on a touch phone, etc. so that the user feels that the key has been touched. Its use is increasing for purposes.

With the rapid expansion of the mobile phone market and the addition of various functions to mobile phones, vibration generators also improve the shortcomings of the existing products and dramatically improve the quality in the situation where miniaturization and high quality of mobile phone parts are required. There is a need for a new product development with a new structure.

Conventional vibration generating apparatus mounted on a portable terminal basically uses a primary vibrometer and attaches a weight to an elastic body such as a coil spring, and has a coil for vibrating the weight.

When a current is applied to the coil, the weight vibrates according to a frequency response characteristic predetermined by the elastic modulus of the weight body and the elastic body.

Recently described portable terminals have a function of providing feedback corresponding to the input to the user by outputting voice or vibration in response to the user's touch input as described above.

In particular, in the case of a portable terminal to which haptic technology is applied, research on a vibration generating device that generates various types of vibrations in order to provide various tactile feedback in response to various inputs of a user is in progress.

However, the conventional vibration generating device is to generate the up and down driving force of the weight body by the Lorentz force generated between the coil and the stator magnet, due to the limitation of the vibration generating device structure by Lorentz force in the vibration strength and vibration frequency band It was difficult to show good characteristics.

In addition, the conventional vibration generator has a structure in which the permanent magnet contained in the weight body with respect to the fixed coil to move inside the coil, there is a high possibility of collision between the coil and the permanent magnet, causing problems such as noise generation and disconnection of the coil. Could.

In order to solve this problem, Korean Laid-Open Patent Publication No. 10-2008-0107506 uses a magnetic fluid, but the cost increases due to the addition of a magnetic fluid configuration. There is a problem that it is difficult to arrange so as to have a constant interval.

The present invention is to solve the above-mentioned problems, by mounting a core fixed in the center of the hollow coil and a permanent magnet on the upper portion so that the structure is simpler and easier to assemble and generate a strong electromagnetic force The purpose is to provide a haptic actuator that can be.

In order to achieve the above object, the haptic actuator of the present invention, the base member; A hollow cylinder-shaped coil disposed on the base member; A core formed in the base member and inserted into the center of the coil; A cover member covering an upper portion of the base member; A diaphragm disposed above the core and moving upward and downward, and having an outer portion coupled to the cover member; And a vibration part connected to the diaphragm and spaced apart from the upper surface of the core, wherein the vibration part is polarized in the vertical direction and spaced apart from the upper surface of the core. It is made to include a vibrating part side permanent magnet disposed in the, and when the direction of the current applied to the coil is changed, the magnetic field generated through the core disposed in the center of the coil and generated in the vibrating part side permanent magnet The vibrating part vibrates in the vertical direction while elastically deforming the diaphragm by the attraction or repulsive force between magnetic fields.

The vibrating part side permanent magnet is fixedly mounted to the diaphragm, and a through hole penetrating in the vertical direction is formed in the core.

At this time, the width of the vibration-side permanent magnet is larger than the width of the through-hole.

And, the width of the vibration-side permanent magnet is preferably equal to or larger than the width of the core.

The vibrating unit is formed in a hollow cylinder shape, and further comprises a weight body disposed around the vibrating unit side permanent magnet and coupled to the diaphragm, wherein the weight body is spaced apart from an outer circumferential surface of the coil. It is arranged to surround the outer circumferential surface of the.

On the other hand, the polarization in the vertical direction and is arranged in the vertical direction of the core further comprises a fixed part side permanent magnet coupled to the core, the magnetic pole of the upper part of the fixed part side permanent magnet facing each other and the vibration part side permanent The magnetic poles at the bottom of the magnet can be configured identically.

At this time, the strength of the magnetic field generated in the core is configured to be stronger than the strength of the magnetic field generated in the fixed-side permanent magnet, when a force is applied between the core and the movable-side permanent magnet when the current is applied to the coil, The force by which the core pulls the movable side permanent magnet is greater than the force by which the fixed side permanent magnet pushes the movable side permanent magnet.

The vibrating unit, and the yoke is disposed on the upper side of the fixed part side permanent magnet coupled to the diaphragm; It includes a vibration magnet side permanent magnet is fixed to the center of the yoke.

The core has a hollow shape and is formed in the center of the base member, and the fixed part side permanent magnet is inserted into the core.

In addition, a buffer member may be provided between the movable part side permanent magnet and the core.

The base member, the core, the cover member, the diaphragm is preferably made of a magnetic material to be connected to each other.

A support jaw bent downward is formed on an upper edge of the cover member, and an outer portion of the diaphragm is coupled to a lower surface of the support jaw, and the vibrating part side permanent magnet is located at the center of the diaphragm spaced apart from the support jaw. Can be arranged.

At this time, the diaphragm has a flat plate shape having the same plane.

In contrast, the diaphragm may be formed in a shape in which the central portion is bent downward, the outer side of the diaphragm may be coupled to the cover member, and the diaphragm side permanent magnet may be disposed at the central portion of the diaphragm.

The core is integrally formed with the base member, and the core is formed by bending the base member upward.

According to the haptic actuator of the present invention as described above has the following effects.

Since the core is mounted at the center of the hollow coil and the permanent magnet is disposed on the upper part of the coil, the permanent magnet is not disposed inside the coil. Therefore, there is no need to maintain a constant gap between the permanent magnet and the coil. It is simple and easy to assemble the product, it is possible to generate a strong electromagnetic force by the core.

In addition, the linear vibration generating apparatus of the present invention can improve the vibration characteristics in the strength and vibration frequency of the vibration, and can be improved by minimizing problems such as coil disconnection of the permanent magnet is moved up and down on the core.

In addition, by mounting the permanent magnet on the fixed part side, it is possible to prevent the vibrating part and the diaphragm from being pulled down by the own weight or by the attractive force of the permanent magnet on the movable part side, and ultimately, the diaphragm is struck downward for a long period of time, thereby firing The deformation can be prevented.

1 is a cross-sectional structure diagram of a haptic actuator according to Embodiment 1 of the present invention;

2 is an exploded perspective view of a haptic actuator according to Embodiment 1 of the present invention;

3 is a comparative view for explaining the structure of the haptic actuator according to the first embodiment of the present invention,

4 is a cross-sectional structure diagram of a haptic actuator according to a modification of Embodiment 1 of the present invention;

5 is a cross-sectional structure diagram of a haptic actuator according to a second embodiment of the present invention;

Example 1

1 is a cross-sectional view of a haptic actuator according to a first embodiment of the present invention, Figure 2 is an exploded perspective view of the haptic actuator according to a first embodiment of the present invention, Figure 3 is a haptic actuator according to a first embodiment of the present invention 4 is a cross-sectional view of a haptic actuator according to a modification of Embodiment 1 of the present invention.

As shown in Fig. 1 and 2, the haptic actuator of the present invention, the base member 10, the coil 20, the core 30, the cover member 40, the diaphragm 50, It includes a vibration unit 60.

The base member 10 has a flat plate shape, and a circuit board 15 for applying a current to the coil 20 is mounted on an upper surface thereof.

The coil 20 is wound in a hollow cylindrical shape and disposed at the upper center of the base member 10.

The core 30 is made of a magnetic material and fixedly coupled to an upper surface of the base member 10, and is inserted into a center of the coil 20.

The core 30 may be manufactured separately from the base member 10 and fixedly coupled to an upper surface of the base member 10, and convexly to the center of the base member 10 in the upward direction as in the present embodiment. It may be bent to form the core 30.

By bending the central portion of the base member 10 to protrude upward, as in this embodiment, the core 30 is formed integrally with the base member 10, thereby easily manufacturing the core 30. .

In addition, the core 30 is formed with a through hole 35 penetrating in the vertical direction.

At this time, the width of the vibration-side permanent magnet 61 is larger than the width of the through-hole 35.

Preferably, the width of the vibrating portion side permanent magnet 61 is equal to or larger than the width of the core 30.

By forming the through hole 35 in the core 30 as described above, the vibration part side permanent by the magnetic force generated in the vibration part side permanent magnet 61 in the state that the current is not applied to the coil 20 The magnet 61 may be lowered to prevent the magnet 61 from coming into contact with the upper surface of the core 30.

If there is no through hole 35 in the core 30 as shown in FIG. 3 (a), the area of the facing surface between the upper surface of the core 30 and the vibrating part side permanent magnet 61 is not included. As the size increases, the attraction between the vibrating part side permanent magnet 61 and the core 30 is greatly generated. The vibrating part side permanent magnet 61 descends in contact with the core 30 in a free state. As a result, the diaphragm 50 may deform for a long time.

In addition, in order to reduce the attraction between the vibrating part side permanent magnet 61 and the core 30, as shown in FIG. Although it is possible to prevent the diaphragm 50 from being deformed, the strength of the electromagnetic force generated in the core 30 is weakened when a current is applied to the coil 20, thereby lowering the vertical movement force of the vibrator 60. Let's go.

However, when the through hole 35 is formed in the core 30 while increasing the size of the core 30 as shown in FIG. 3 (c), the vibrating part side permanent magnet 61 and Since the size of the area facing each other between the cores 30 becomes smaller, the attractive force between the vibration part-side permanent magnets 61 and the cores 30 is weakly generated, and thus free current is not applied to the coils 20. In this state, the vibration part side permanent magnet 61 is minimized from falling toward the core 30, thereby preventing the vibration plate 50 from being deformed for a long time and plastically deformed.

In addition, since the core 30 is large in size, a strong electromagnetic force may be generated when a current is applied to the coil 20.

In this regard, since the through hole 35 is formed in the core 30, it may be considered that the strength of the electromagnetic force generated in the core 30 will be much weakened, but the electromagnetic force generated in the electromagnet is It is generated more strongly at the portion adjacent to the coil 20 than at the central portion. Even though the through hole 35 is formed at the central portion of the core 30, if the current is applied to the coil 20, the core 30 is strong. Generate electromagnetic force.

As described above, in the present invention, the through hole 35 is formed in the core 30, so that when the current is not applied to the coil 20, the vibrating part side permanent magnet 61 moves toward the core 30. It is possible to minimize the falling, when applying a current to the coil 20 has the effect of generating a large electromagnetic force in the core 30 to increase the shank power of the vibration unit 60.

When the vibration part side permanent magnet 61 is disposed above the core 30, the width of the vibration part side permanent magnet 61 is smaller than the width of the through hole 35. Almost no action occurs between the electromagnetic force generated at 30 and the magnetic force generated at the vibrating part side permanent magnet 61, so that the vibrating part 60 cannot smoothly move up and down.

Accordingly, the width of the vibrating part side permanent magnet 61 is larger than the width of the through hole 35, and preferably, the width of the vibrating part side permanent magnet 61 is the width of the core 30. Make it equal to or greater than

The cover member 40 is formed in a cylindrical shape with a lower portion covering the upper portion of the base member 10.

Therefore, the remaining components forming the haptic actuator of the present invention are disposed between the base member 10 and the cover member 40.

The diaphragm 50 is disposed on the upper portion of the core 30 to move in the vertical direction, and consists of a leaf spring, the outer side is coupled to the cover member 40.

At this time, the diaphragm 50 is preferably made of a flat plate shape having the same plane.

In addition, a support jaw 45 bent downward is formed on an upper edge of the cover member 40, and the diaphragm 50 having a plate shape is coupled to a lower surface of the support jaw 45.

By forming the support jaw 45 and forming the diaphragm 50 in the form of a flat plate, it is not necessary to manufacture the diaphragm 50 in a bent shape or a disc shape, and thus it is easy to manufacture and assemble.

The vibrator 60 is connected to the diaphragm 50 and is disposed above the core 30 while being spaced apart from the upper surface of the core 30.

In the present embodiment, the vibrator 60 includes a vibrator-side permanent magnet 61 and a weight body 62.

The vibrating unit side permanent magnet 61 is coupled to a lower surface of the central part of the diaphragm 50 and disposed above the core 30 in a state spaced apart from the upper surface of the core 30.

The vibrating part side permanent magnet 61 is magnetized by polarizing the N pole and the S pole in the vertical direction in which the core 30 is disposed.

The weight body 62 is formed in a hollow cylindrical shape and is disposed around the vibrating part side permanent magnet 61 and coupled to the diaphragm 50.

In addition, the weight body 62 is disposed to surround the outer circumferential surface of the coil 20 in a state spaced apart from the outer circumferential surface of the coil 20.

The weight body 62 is heavier than the vibrating part side permanent magnet 61 and serves to flow better when the vibrating part side permanent magnet 61 flows in the vertical direction.

In addition, in order to prevent the weight body 62 from becoming an obstacle when the diaphragm 50 is elastically deformed in the upward direction, the upper surface of the weight body 62 is the diaphragm in the elastic deformation section of the diaphragm 50. 50).

In addition, the lower surface of the vibrating portion side permanent magnet 61 or the upper surface of the core 30 buffer for preventing the generation of noise due to the collision with the core 30 at the same time when the vibrating portion side permanent magnet (61). A member (not shown) etc. can also be attached.

The base member 10, the core 30, the cover member 40, and the diaphragm 50 are all made of magnetic material so as to be magnetically connected to each other.

As a result, the magnetic force generated in the vibrating part side permanent magnet 61 is transmitted to the diaphragm 50, the cover member 40, the base member 10, and the core 30, and a current is transmitted to the coil 20. When is applied to the up and down movement of the diaphragm 50 can be made better.

Of course, the base member 10, the cover member 40 and the diaphragm 50 may not be made of a magnetic material.

The haptic actuator of the present invention having such a structure is generated through the core 30 disposed at the center of the coil 20 when the direction of the periodically applied current is changed while applying current to the coil 20. The attraction force or repulsive force is generated between the magnetic field and the magnetic field generated by the vibrating part side permanent magnet 61, and the vibrator 60 moves up and down while elastically deforming the vibrating plate 50.

On the other hand, as shown in Figure 4, the diaphragm 55 is formed in a shape in which the central portion is bent downward, the outer portion of the diaphragm 55 may be coupled to the inner lower surface of the cover member 40. have.

Example 2

5 is a cross-sectional view of a haptic actuator according to a second embodiment of the present invention.

As shown in FIG. 5, the haptic actuator of Embodiment 2 of the present invention includes a base member 10, a coil 20, a core 30, a cover member 40, a diaphragm 50, And a vibrator 60, a fixed part side permanent magnet 70, and a shock absorbing member 90.

The base member 10, the coil 20, the core 30, the cover member 40, the diaphragm 50 is the same as the configuration of the above-described embodiment 1 bar detailed description thereof will be omitted, the vibration unit ( 60), the fixed part side permanent magnet 70, the buffer member 90, etc. are demonstrated mainly.

Although the through hole is not formed in the base member 10 in FIG. 5, it may be formed as in the first embodiment.

The vibrator 60 includes a yoke 63 and a vibrator-side permanent magnet 61.

The yoke 63 is disposed on an upper portion of the core 30 to which the fixed part side permanent magnet 70 is coupled, and is coupled to a lower portion of the diaphragm 50.

The vibration part side permanent magnet 61 is fixedly coupled to the center of the yoke (63).

The fixed part side permanent magnet 70 is polarized in the vertical direction and is coupled to the core 30 to be disposed in the vertical direction of the core 30.

In the present embodiment, the fixed part side permanent magnet 70 is coupled to the inside of the core 30, but may be coupled to the upper portion of the core (30).

Preferably, as in the present embodiment, the core 30 is formed in a hollow shape, and the fixing part side permanent magnet 70 is inserted into and mounted inside the core 30.

Then, the magnetic poles of the upper part of the fixed part side permanent magnet 70 and the lower magnetic poles of the vibrating part side permanent magnet 61 face each other to be arranged in the same manner.

For example, as shown in FIG. 5, when the magnetic poles of the upper parts of the fixed part side permanent magnets 70 facing each other are set to the N poles, the magnetic poles of the lower part of the vibrating part side permanent magnets 61 are set to N poles. Place the pole set.

Therefore, mutual repulsive force is always generated between the fixed part side permanent magnet 70 and the vibration part side permanent magnet 61 in a state where no current is applied to the coil 20.

Thus, the vibrator 60, on which the vibrator side permanent magnet 61 is mounted, is always forced upward in a state in which no current is applied to the coil 20, so that the vibrator 60 is provided. And the diaphragm 50 can be prevented from being pulled down by its own weight or by the attractive force of the movable part side permanent magnet 61, and ultimately the plastic deformation due to the diaphragm 60 being struck downward for a long time. Can be prevented.

The vibrator 60 may further include a weight body 62 mounted around the yoke 63 as necessary.

The shock absorbing member 90 is disposed between the movable part side permanent magnet 61 and the core 30 to prevent collision and unwanted sound generation due to the collision.

In the haptic actuator of the second embodiment having such a configuration, when the direction of the current applied to the coil 30 is changed, as described in the first embodiment, the vibrator 60 and the diaphragm 50 move in the vertical direction. While generating vibration.

At this time, the strength of the magnetic field generated in the core 30 is configured to be stronger than the strength of the magnetic field generated in the fixed-side permanent magnet 70.

Therefore, when a current is applied to the coil 20 and an attractive force acts between the core 30 and the movable part permanent magnet 61, the core 30 pulls the movable part side permanent magnet 61. The force is greater than the force that the fixed-side permanent magnet 70 pushes the movable side permanent magnet 61, so that the movable-side permanent magnet 61 overcomes the repulsive force with the fixed-side permanent magnet 70 and descends. It becomes possible.

That is, in the state shown in FIG. 5, when the current is applied to the coil 20 to magnetize the upper portion of the core 30 to the S pole, the core 30 moves the permanent magnet 61 to the movable part side. The pulling force is greater than that of the fixed part side permanent magnet 70 pushing the movable part side permanent magnet 61, so that the movable part side permanent magnet 61 can move downward.

As a result, the vibrating unit 60 on which the movable part side permanent magnet 61 is mounted can move in the vertical direction while having a larger displacement to generate vibration.

Other matters are the same as those in the first embodiment, detailed description thereof will be omitted.

The haptic actuator of the present invention is not limited to the above-described embodiments, and may be variously modified and implemented within the scope of the technical idea of the present invention.

The haptic actuator of the present invention may be mounted on a portable terminal or the like to generate vibration in a specific condition so that the user can feel the touch caused by the vibration.

Claims (15)

A base member; A hollow cylinder-shaped coil disposed on the base member; A core formed in the base member and inserted into the center of the coil; A cover member covering an upper portion of the base member; A diaphragm disposed above the core and moving upward and downward, and having an outer portion coupled to the cover member; Is made of a vibrating portion connected to the diaphragm and disposed above the core in a state spaced apart from the upper surface of the core, The vibrating part includes a vibrating part side permanent magnet which is polarized in a vertical direction and disposed above the core in a state spaced apart from the upper surface of the core, When the direction of the current applied to the coil is changed, the vibrating portion is caused by the attraction or repulsive force between the magnetic field generated through the core disposed in the center of the coil and the magnetic field generated in the permanent magnet side of the vibration part. Haptic actuator, characterized in that the oscillating in the vertical direction while elastically deforming. The method according to claim 1, The vibration part side permanent magnet is fixedly mounted to the vibration plate, The core is a haptic actuator characterized in that the through-hole penetrating in the vertical direction. The method according to claim 2, Haptic actuator, characterized in that the width of the vibration-side permanent magnet is larger than the width of the through hole. The method according to claim 3, Haptic actuator, characterized in that the width of the vibration-side permanent magnet is equal to or larger than the width of the core. The method according to claim 1, The vibrating unit is formed in a hollow cylinder shape, and further comprises a weight body disposed around the vibrating unit side permanent magnet and coupled to the diaphragm, The haptic actuator is characterized in that the weight is arranged to surround the outer peripheral surface of the coil in a state spaced apart from the outer peripheral surface. The method according to claim 1, It is made of a polarization in the up and down direction further comprises a permanent magnet side fixed to the core to be disposed in the vertical direction of the core, A haptic actuator, characterized in that the magnetic poles of the upper portion of the permanent magnets on the fixed side side and the magnetic poles of the lower portion of the vibrating portion side permanently facing each other. The method according to claim 6, The strength of the magnetic field generated in the core is configured to be stronger than the strength of the magnetic field generated in the permanent magnet side, When a current is applied to the coil and an attractive force is applied between the core and the movable part permanent magnet, the force of the core to pull the movable part permanent magnet is greater than that of the fixed part side permanent magnet to push the movable part permanent magnet. Haptic actuator, characterized in that large. The method according to claim 6, The vibrating unit, A yoke disposed on the fixing part side permanent magnet and coupled to the diaphragm; Haptic actuator characterized in that it comprises a permanent magnet on the vibrating side fixed to the center of the yoke. The method according to claim 6, The core is formed in the center of the base member made of a hollow shape, The fixed part side permanent magnet is haptic actuator, characterized in that inserted into the core. The method according to any one of claims 1 to 9, A haptic actuator, characterized in that a buffer member is provided between the movable part side permanent magnet and the core. The method according to any one of claims 1 to 9, The base member, the core, the cover member, the diaphragm is a haptic actuator, characterized in that made of a magnetic body connected to each other. The method according to any one of claims 1 to 9, The upper edge of the cover member is formed with a supporting jaw bent downwards, The outer portion of the diaphragm is coupled to the lower surface of the support jaw, the haptic actuator, characterized in that the vibration-side permanent magnet is disposed in the center of the diaphragm spaced apart from the support jaw. The method according to claim 12, The haptic actuator is characterized in that the plate made of a flat plate having the same plane. The method according to any one of claims 1 to 9, The diaphragm is formed in a shape in which the central portion is bent downward, The outer portion of the diaphragm is coupled to the cover member, the haptic actuator, characterized in that the vibrating portion side permanent magnet is disposed in the center of the diaphragm. The method according to any one of claims 1 to 9, The core is formed integrally with the base member, The core is a haptic actuator, characterized in that formed by bending the base member in the upward direction.

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