KR102116249B1 - Linear Actuator - Google Patents

Abstract

The present invention relates to a linear actuator capable of improving acoustic characteristics by transferring vibration only to a front side of a case. The linear actuator comprises: a yoke having a core protruding from a center of a yoke plate; a case coupled to the yoke to form a mounting space therein; a magnet arranged on the yoke plate; a voice coil arranged around the core and generating a magnetic field with direction and intensity changed depending on a current signal flowing; a vibration member arranged to face the voice coil and the magnet, and magnetized by the magnet to be vibrated by the magnetic field with direction and intensity changed; a spring plate for elastically supporting the vibration member to the case; and a vibration carrier for carrying a vibration force of the vibration member to a front surface of the case. The linear actuator allows the vibration member to directly vibrate the front surface of the case (that is, a display panel contact surface) so as to transfer a vibration force generated in the vibration member to a display panel of a mobile phone without loss, thereby improving acoustic performance of the linear actuator.

Description

Linear Actuator {Linear Actuator}

The present invention relates to a linear actuator, and more particularly, to a linear actuator capable of improving sound characteristics by transmitting vibration only to the front of the case.

Generally, a receiver or a speaker device is mounted in a portable terminal for a call or multimedia reproduction. Traditional receivers or speakers use sound waves transmitted through the air, so the sound can be heard from outside, and users with hearing loss have restrictions on use. To this end, a bone conduction type receiver or speaker device has been proposed. The bone conduction receiver or speaker transmits vibrations directly through the skin or bones to the auditory nerve, so it does not require air and does not need to be used directly against the ear.

Moreover, with the introduction of full screens in mobile phones, there is an increasing tendency to use linear actuators in place of receivers that reproduce song sounds.

No. 10-2014-0128525 published in the Republic of Korea Patent Application Publication No. 10 has a permanent magnet, a coil, and a printed circuit board inside the case, and when power is input from the outside through the printed circuit board, it acts between the coil and the permanent magnet. In a linear actuator in which a weight vertically vibrates due to the electromagnetic force to be used, a clearance can be utilized in a narrow shape, so that a linear actuator having a high mountability and high vibration force is disclosed. Such a conventional linear actuator is intended to transmit vibration to a large-sized smartphone or tablet by increasing the vibration force by a weight, and is limited to a low frequency band and is not suitable for a receiver.

In addition, the receiver module announced with the registration number 10-1635021 and the portable terminal having the same are related to the bone conduction receiver of the mobile terminal, a plurality of contact plates arranged in different areas that are divided, and a plurality of contacts corresponding to each contact plate Includes a vibrator, each vibrator comprises a multi-stage vibrating body configured to vibrate the contact plate specified among the plurality of contact plates stepwise according to a frequency band, and an actuator formed to generate vibration of the multi-stage vibrating body. Includes. However, such a conventional bone conduction receiver is a structure in which a multi-stage vibrating body is arranged in a circle, and is used as a structure independent of an object such as a display.

In addition, the bone conduction device and its diaphragm announced in Japanese Patent Office No. 4118863 are magnetic-type acoustic conversion devices having a magnetic structure with a voice coil mounted on the central magnetic pole of the yoke and a magnet placed outside the voice coil. The central magnetic pole is a longitudinal structure in which magnets are arranged on both side short sides of the yoke, and diaphragm fixing parts are disposed on the outside of each magnet on the magnetic placement axis. In such a conventional bone conduction device, the vibration member is fixed to the spring, and the spring is fixed to the bottom plate, and the vibration force of the vibration member is excited through the spring and indirectly to the front of the case. It is a structure that is transmitted.

 Therefore, when a conventional linear actuator is applied to a mobile phone or the like, a loss occurs in the process of transmitting the vibration force of the vibrating member to the front of the case, and the fixing part of the spring is disposed on the bottom plate to activate the actuator. Since vibration occurs in the whole, it causes vibration in parts other than the display panel of the mobile phone, which causes inconvenience to the user during a call.

The present invention has been proposed to solve the above problems, the object of the present invention is the vibration member of the actuator (Actuator) to the front of the case (Display Panel contact surface) or the object to directly vibrate the vibration force generated by the vibration member It is to provide a linear actuator capable of improving sound performance by transferring it to a display panel of a mobile phone without loss.

An embodiment of the present invention discloses a linear actuator capable of improving acoustic characteristics by transmitting vibration only to the front of the case.

The disclosed linear actuator includes a yoke having a core structure protruding from the center of the yoke plate, a case coupled to the yoke to form a mounting space therein, a magnet disposed on the yoke plate, and disposed around the core , A vibration of a voice coil that generates a magnetic field whose direction and intensity change according to a current signal flowing, and vibrations vibrated by a magnetic field that is disposed opposite the voice coil and magnet and is magnetized by the magnet to change the direction and intensity It includes a member, a spring plate for elastically supporting the vibration member to the case, and a vibration transmission body for transmitting the vibration force of the vibration member to the front surface of the case.

A coupling hole is formed on the front surface of the case, and both ends of the spring plate are formed with coupling protrusions in a vertical direction to be fitted with the coupling hole.

Another embodiment of the present invention discloses a linear actuator capable of directly transmitting vibration force to an object to improve acoustic characteristics.

Another disclosed linear actuator includes a yoke having a structure in which a core protrudes in the center of a yoke plate, a case having a through hole of a predetermined shape formed on the front surface, a case forming a mounting space therein by engaging with the yoke, and disposed on the yoke plate A magnet to be disposed, a voice coil that is disposed around the core and generates a magnetic field whose direction and intensity are changed according to a current signal flowing therethrough, and is disposed opposite to the voice coil and the magnet, and magnetized by the magnet to rotate in the direction A vibration member vibrated by a magnetic field whose intensity is changed, a spring plate elastically supporting the vibration member to the case, and projecting through a through hole of the case to directly transmit the vibration force of the vibration member to an object For vibration transmission.

Two through-holes are formed in the case, and the vibration transmission body is separated into two and then protrudes through the two through-holes to transmit the vibration force of the vibrating member to each object.

In addition, a locking jaw is formed in the case, and both ends of the spring plate are joined to the locking jaw to fix the spring plate to the case.

The linear actuator according to the embodiment of the present invention allows the vibrating member to directly vibrate the case front (ie, the display panel contact surface), thereby transmitting the vibration force generated by the vibrating member to the display panel of the mobile phone without loss, and thus the linear actuator. There is an effect that can improve the acoustic performance of.

In addition, according to an embodiment of the present invention, there is an advantage that it is easy to use during a call by concentrating the vibration direction on a display panel of a mobile phone and suppressing vibrations in parts other than the display panel.

1 is an exploded perspective view of a linear actuator according to a first embodiment of the present invention,
Figure 2 is an assembly cross-sectional view of the linear actuator according to the first embodiment of the present invention,
3 is a conceptual diagram of vibration transmission of the linear actuator according to the first embodiment of the present invention,
Figure 4 is an exploded perspective view of a linear actuator according to a second embodiment of the present invention,
Figure 5 is a cross-sectional view of the assembly of the linear actuator according to the second embodiment of the present invention,
6 is a conceptual diagram of vibration transmission of a linear actuator according to a second embodiment of the present invention,
7 is an exploded perspective view of a linear actuator according to a third embodiment of the present invention,
8 is a cross-sectional view of the assembly of the linear actuator according to the third embodiment of the present invention,
9 is a conceptual diagram of vibration transmission of a linear actuator according to a third embodiment of the present invention.

The technical problems achieved by the present invention and the practice of the present invention will be made clear by preferred embodiments of the present invention described below. The following examples are only illustrated to illustrate the present invention, and are not intended to limit the scope of the present invention.

The embodiment of the present invention discloses the linear actuator of the first embodiment in which the vibrating member vibrates the object through the case, and the linear actuators of the second and third embodiments in which the object is vibrated directly through the through hole of the case.

<First Example>

1 is an exploded perspective view of a linear actuator according to a first embodiment of the present invention, FIG. 2 is a cross-sectional view of an assembly of a linear actuator according to a first embodiment of the present invention, and FIG. 3 is according to a first embodiment of the present invention It is a conceptual diagram of vibration transmission of a linear actuator.

The linear actuator 100 according to the first embodiment of the present invention, as shown in Figures 1 to 3, yoke 110, PCB 120, a pair of magnets (130-1,130-2), voice coil ( 140), a vibration member 150, a spring plate 160, a vibration transmission body 170, and a case 180.

1 and 2, the yoke 110 includes a rectangular yoke plate 112 for installing a pair of magnets 130-1 and 130-2, and a core 114 protruding in the center of the yoke plate 112. ; Pole), a groove 116 for mounting the PCB 120 is formed on one side of the short side of the yoke plate 112. In addition, protruding portions 118 for fastening with the case 180 are formed on both sides of the long side of the yoke plate 112. In this way, the shape of the yoke of the embodiment is a pole (POLE) integral structure for fixing the voice coil 140 in the center and forming a magnetic force.

The PCB 120 is mounted in the groove 116 to receive an audio signal from the outside and transmit it to the voice coil 140. A connection pad and an electric pattern are formed, and a pair of magnets 130-1 and 130-2 are It is for magnetizing the vibrating member 150 by forming a fixed magnetic field in the form of a square bar. The PCB 120 may be implemented as a flexible PCB (FPCB), and the magnets 130-1, 130-2, the yoke 110, and the vibration member 150 constitute a closed loop magnetic circuit of a fixed magnetic field.

The voice coil 140 is wound around the core 114 and generates a variable magnetic field in which the magnetization direction and intensity are changed according to the audio signal applied through the PCB 120, and the vibration member 150 is generated by the variable magnetic field. ) And an attractive force or repulsive force is generated to vibrate the vibrating member 150.

The spring plate 160 is made of a non-magnetic material (for example, stainless steel (SUS)), and a through hole 166 and a vibration member 150 for mounting the vibration member 150 on a rectangular elastic plate 162 ) Is coupled to the wing 164 is formed, both ends of the elastic plate short sides are bent in the vertical direction toward the case 180 to form a bent portion, the end of the bent portion is fastened to fasten the case 180 The projection 168 is formed.

The vibrating member 150 is made of a magnetic material (eg, steel (SPCC)) that is easily magnetized by the magnets 130-1 and 130-2, and has a long shape according to the shape of the through hole 166 of the spring plate 160. In the center portion, a coupling groove 152 for coupling with the wing 164 of the spring plate is formed. In addition, a forging part for seating the vibration transmission body 170 is formed on one surface of the vibration member 150.

The vibration transmission body 170 is made of a material having a slight elasticity and non-magnetic material (for example, urethane, silicon, plastic, etc.), and transmits the vibration force of the vibration member 150 to the case 180 side.

The case 180 has a rectangular box shape with one surface open, and a coupling hole 182 for coupling with the fastening protrusion 168 of the spring plate is formed on the opposite side of the opening surface, and the protruding portion of the yoke ( 118) and a fastening portion 184 for fastening.

The components of the first embodiment are completed with the linear actuator assembly 100 as shown in FIG. 2 through the following assembly procedure.

First, after the PCB 120 is seated in the groove 116 of the yoke plate, the voice coil 140 is fitted to the core 114 of the yoke, and a pair of magnets 130- are placed on the yoke plate 112 on both sides of the core. 1,130-2) are arranged in parallel to assemble the bottom side sub-assembly.

In addition, after the vibration member 150 is coupled to the spring plate 160, the vibration transmission body 170 is seated on the forging part of the vibration member 150, and the fastening protrusion 168 of the spring plate is coupled to the coupling hole 182 of the case. The case-side subassembly is assembled by sandwiching and laser welding.

Subsequently, the assembly is completed by combining the bottom-side sub-assembly and the case-side sub-assembly, and after mounting the completed assembly 100 of the first embodiment on an object 10 such as a mobile phone as shown in FIG. 3, the PCB 120 ), The audio signal is applied to the connection pad.

Referring to FIG. 3, the audio signal input through the PCB 120 generates a variable magnetic field while flowing through the voice coil 140 to vibrate the vibrating member 150, and the vibration force of the vibrating member 150 is a vibration transmission body. It is transferred to the front of the case 180 through 170, and the case 180 again applies a vibration force to the object 10. Accordingly, as the object 10 is vibrated, functions such as a bone conduction receiver are performed.

Thus, according to the first embodiment of the present invention, the spring plate 160 supporting the vibration member 150 is fastened to the front side of the case 180 to transmit the vibration force of the vibration member 150 to the vibration transmission body 170 By focusing with the front of the case together, the vibration force of the vibration member 150 can be prevented from being lost in the process of being transferred to the object 10, and abnormal vibration of the object occurring in an unwanted part can be suppressed. That is, since the spring plate 160 is connected to the case 180, the vibration generated by the vibration member 150 is directly transmitted to the case 180, and at the same time, it is transmitted to the case 180 through the spring plate 160 and lost. Can be reduced.

<Second Example>

4 is an exploded perspective view of a linear actuator according to a second embodiment of the present invention, FIG. 5 is an assembled cross-sectional view of a linear actuator according to a second embodiment of the present invention, and FIG. 6 is according to a second embodiment of the present invention It is a conceptual diagram of vibration transmission of a linear actuator.

The linear actuator 200 according to the second embodiment of the present invention, as shown in Figures 4 to 6, yoke 210, PCB 220, a pair of magnets (230-1,230-2), voice coil ( 240), a vibrating member 250, a spring plate 260, a vibration transmitting body 270-1,270-2, and a case 280.

4 and 5, the yoke 210 has a rectangular yoke plate 212 for installing a pair of magnets 230-1 and 230-2, and a core 214 protruding in the center of the yoke plate 212 ; Pole), and a groove 216 for mounting the PCB 220 is formed on one side of the yoke plate 212. In addition, protrusions 218 for fastening with the case 280 are formed on both sides of the long side of the yoke plate 212.

The PCB 220 is mounted in the groove 216 to receive an audio signal from the outside and transmit it to the voice coil 240. A connection pad and an electric pattern are formed, and a pair of magnets 230-1 and 230-2 It is for magnetizing the vibrating member 250 by forming a fixed magnetic field in the form of a square bar. The magnets 230-1, 230-2, the yoke 210, and the vibrating member 250 constitute a closed loop magnetic circuit of a fixed magnetic field.

The voice coil 240 is wound around the core 214 and generates a variable magnetic field in which the magnetization direction and intensity are changed according to the audio signal applied through the PCB 220, and the vibration member 250 is generated by the variable magnetic field. ) And an attractive force or repulsive force is generated to vibrate the vibrating member 250.

The spring plate 260 is made of a non-magnetic material (for example, stainless steel (SUS)), and a through hole 266 and a vibration member 250 for mounting the vibration member 250 on the rectangular elastic plate 262 ) Is coupled to the wing 264 is formed, and both ends of the short side of the elastic plate is flat so that the locking jaw 284 of the case 280 can be rough.

The vibrating member 250 is made of a magnetic material (eg, steel (SPCC)) that is easily magnetized by the magnets 230-1 and 230-2, and has a rectangular shape according to the shape of the through hole 266 of the spring plate 260. The coupling groove 252 for coupling with the wing 264 of the spring plate is formed in the center portion, and a forging part for seating the two vibration transmission bodies 270-1 and 270-2 is formed.

The vibration transmission bodies 270-1 and 270-2 are made of a material having a slightly elastic nonmagnetic material (for example, urethane, silicon, plastic, etc.), and the object (through the through holes 282-1 and 282-2) of the case ( 10) is in direct contact with the vibration member 250 transmits the vibration force directly to the object (10).

The case 280 has a rectangular box shape with one surface open, and two through-holes 282-1,282 so that the vibration transmission bodies 270-1 and 270-2 protrude on the opposite side of the opening surface to directly contact the object 10. -2) is formed, the side of the long side is formed with a fastening portion 286 for fastening with the protrusion 218 of the yoke. In addition, both ends of the front of the case are concave locking jaws 284 are formed so that both ends of the short sides of the spring plate 260 can be supported, respectively.

The components of the second embodiment are completed with the linear actuator assembly 200 shown in FIG. 5 through the following assembly procedure.

First, after the PCB 220 is seated in the groove 216 of the yoke plate, the voice coil 240 is fitted to the core 214 of the yoke, and a pair of magnets 230- are placed on the yoke plate 212 on both sides of the core. 1,230-2) are arranged in parallel to assemble the bottom side sub-assembly. These bottom-side sub-assemblies have the same structure as each other in the first to third embodiments.

In addition, after the vibration member 250 is coupled to the spring plate 260, the vibration transmission bodies 270-1 and 270-2 are respectively seated in the forging portions of the vibration member 250, and both ends of the spring plate 260 are locked to the case. The case side subassembly is assembled by laser welding to 284.

Subsequently, the assembly is completed by combining the bottom-side sub-assembly and the case-side sub-assembly, and after mounting the completed assembly 200 of the second embodiment on the object 10 such as a mobile phone, the PCB 220 ), The audio signal is applied to the connection pad.

Referring to FIG. 6, the audio signal input through the PCB 220 generates a variable magnetic field while flowing through the voice coil 240 to vibrate the vibrating member 250, and the vibrating force of the vibrating member 250 is two. It protrudes through the through-holes of the case 280 through the vibration transmission bodies 270-1 and 270-2, and is directly transmitted to the object. Accordingly, as the object 10 is vibrated, it functions as a bone conduction receiver.

As described above, according to the second embodiment of the present invention, the spring plate 260 supporting the vibration member 250 is fastened to the locking jaw 284 of the case 280 to transmit the vibration force of the vibration member 250 to the vibration transmission body. By focusing on the object 10 together with the 270, the vibration force of the vibration member 250 can be prevented from being lost in the process of being transferred to the object 10, and the abnormal vibration of the object occurring in an unwanted part can be suppressed. Can be. That is, since the spring plate 260 is connected to the locking jaw 284 of the case 280, the vibration force generated by the vibration member 250 is transmitted indirectly through the case 280, and at the same time, the vibration transmission bodies 170-1,270- 2) is in close contact with the object 10 can transmit the vibration force directly to the object 10.

As described above, in the second embodiment of the present invention, a plurality of vibration transmission bodies 270-1 and 270-2 protrude to the outside of the case 280 and directly contact the object 10, thereby losing vibration generated by the vibration member 250. It is possible to improve the acoustic performance of the display panel by directly transferring the display panel without a signal.

<Third Example>

7 is an exploded perspective view of the linear actuator according to the third embodiment of the present invention, FIG. 8 is an assembly cross-sectional view of the linear actuator according to the third embodiment of the present invention, and FIG. 9 is according to the third embodiment of the present invention It is a conceptual diagram of vibration transmission of a linear actuator.

Linear actuator 300 according to the third embodiment of the present invention, as shown in Figures 7 to 9, yoke 310, PCB 320, a pair of magnets (330-1,330-2), voice coil ( 340), a vibration member 350, a spring plate 360, a vibration transmission body 370, and a case 380.

7 to 9, one through-hole 382 is formed on the front surface of the case 380 so that one vibration transmission body 370 protrudes out of the case 380 to vibrate the object 10 ( Except for directly transmitting the vibration force of 350), most of the configuration is the same as that of the second embodiment, so further description will be omitted.

Thus, in the case of the third embodiment, since one vibration transmission body 370 is used, assembly of parts is convenient.

In the above, the present invention has been described with reference to one embodiment shown in the drawings, but those skilled in the art will understand that various modifications and other equivalent embodiments are possible therefrom.

100,200,300: Linear actuator 110,210,310: York
120,220,320: PCB 130-1 / 2,230-1 / 2,330-1 / 2: Magnet
140,240,340: Voice coil 150,250,350: Vibration member
160,260,360: Spring plate 170,270-1,270-2,370: Vibration carrier
180,280,380: case

Claims (5)

delete delete A yoke having a core protruding in the center of a rectangular yoke plate, and having a groove for mounting a PCB on one side of the yoke plate;
A case in which a through hole having a predetermined shape is formed on the front surface and is fastened to the yoke to form a mounting space therein;
PCB for seating in the groove of the yoke to receive an audio signal from the outside;
A pair of magnets disposed on one side of the yoke plate and on the upper side of the PCB;
A voice coil disposed around the core and connected to a connection pad of the PCB to generate a magnetic field in which direction and intensity are changed according to a current of an input audio signal;
A vibrating member disposed opposite the voice coil and the magnet and vibrated by a magnetic field in which the direction and intensity are changed by being magnetized by the magnet;
A spring plate for elastically supporting the vibrating member to the case; And
A linear actuator including a vibration transmitting body protruding through a through hole of the case to directly transmit the vibration force of the vibration member to an object. The method of claim 3, wherein the case is formed with two through-holes, and the vibration transmission body is separated into two and then protrudes through the two through-holes, respectively, to transmit the vibration force of the vibrating member to each object. Linear actuator to be made. The linear actuator according to claim 3 or 4, wherein a locking jaw is formed in the case, and both ends of the spring plate are joined to the locking jaw to fix the spring plate to the case.

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