Apparatus for Vibration Generating

Abstract

The present invention relates to a vibration generating device comprising: a frame forming the outer shape of the vibration generating device; a voice coil coupled to the frame; a magnetic circuit section forming a magnetic circuit; and a weight positioned spaced apart from the magnetic circuit section in the height direction, wherein the magnetic circuit section comprises a first magnet generating a magnetic field, a second magnet forming a magnetic field at a position spaced apart from the first magnet, and a pole piece positioned between the first magnet and the second magnet, wherein the magnetic poles of the first magnet and the second magnet are positioned facing each other so that the magnetic field is concentrated toward the pole piece.

Description

Technology Field

[0001] The present invention relates to a vibration generating device for generating vibration. Background Technology

[0002] A vibration generating device is a device that generates vibration. The above vibration generating device is installed in devices that implement haptics. For example, vibration motors, vibration elements, haptic actuators, and linear resonant actuators (LRAs) are examples of vibration generating devices. Such vibration generating devices are mounted on mobile phones and used to transmit incoming call signals via vibration or to notify of a signal via vibration when the phone screen is touched.

[0003] FIG. 1 is a schematic cross-sectional view of a vibration generating device (100) according to the prior art.

[0004] A vibration generating device (100) according to the prior art may include a frame (110) forming the outer shape of the vibration generating device, a magnetic circuit part (120) forming a magnetic circuit, a voice coil (130) disposed on a magnetic gap (120a) formed by the magnetic circuit part (120), and an elastic part (140) coupled to each of the magnetic circuit part (120) and the frame (110). Additionally, a vibration generating device (100) according to the prior art may include cover parts (150) coupled to the upper and lower sides of the frame (110). In this case, the voice coil (130) may be coupled to be fixed to the cover part (150). Accordingly, when power is applied to the voice coil (130), the vibration generating device (100) according to the prior art can generate a vibration force in the vertical direction through interaction with the magnetic field formed within the magnetic gap (120a). Accordingly, in the vibration generating device (100) according to the prior art, the magnetic circuit part (120) can vibrate in the up and down direction on the elastic part (140) by means of vibration force. However, the resonance frequency is determined by the total weight of the magnetic circuit part (120) and the elastic modulus of the elastic part (140), and the vibration generating device (100) according to the prior art is implemented so that the resonance frequency has a single frequency. Accordingly, the vibration generating device (100) according to the prior art has a problem in that it cannot implement various vibration intensities as it vibrates at a single vibration frequency. The problem to be solved

[0005] The present invention was devised to solve the problems described above and is intended to provide a vibration generating device having various vibration frequencies. means of solving the problem

[0006] In order to solve the above problems, the present invention may include the following configuration.

[0007] It may include a frame forming the outer shape of a vibration generating device; a voice coil coupled to the frame; a magnetic circuit section forming a magnetic circuit; and a weight positioned spaced apart from the magnetic circuit section in the height direction. The magnetic circuit section may include a first magnet forming a magnetic field, a second magnet forming a magnetic field at a position spaced apart from the first magnet, and a pole piece positioned between the first magnet and the second magnet. The magnetic poles of the first magnet and the second magnet may be positioned facing each other so that the magnetic field is concentrated toward the pole piece. Effects of the invention

[0008] According to the present invention, the following effects can be achieved.

[0009] In the present invention, a magnetic field can be strongly concentrated or emitted from the pole piece positioned between the first magnet and the second magnet. Accordingly, the present invention can generate a strong vibrational force through the magnetic field concentrated by the first magnet and the second magnet.

[0010] In addition, the present invention can be vibrated to have various vibration frequencies through a magnetic circuit and a weight. Brief explanation of the drawing

[0011] FIG. 1 is a schematic cross-sectional view of a vibration generating device according to the prior art. FIG. 2 is a schematic cross-sectional view of a vibration generating device according to the present invention. FIG. 3 is a schematic cross-sectional view of a magnetic circuit portion vibrated upward in a vibration generating device according to the present invention. FIG. 4 is a schematic cross-sectional view of a magnetic circuit portion vibrated downward in a vibration generating device according to the present invention. FIG. 5 is a schematic cross-sectional view of a weight body vibrating upward in a vibration generating device according to the present invention. FIG. 6 is a schematic cross-sectional view of a weight body vibrating downward in a vibration generating device according to the present invention. FIG. 7 is a schematic cross-sectional view of a weight according to another embodiment of a vibration generating device according to the present invention. FIG. 8 is a schematic cross-sectional view of a weight according to another embodiment of a vibration generating device according to the present invention. Specific details for implementing the invention

[0012] Hereinafter, an embodiment of the vibration generating device according to the present invention will be described in detail with reference to the attached drawings.

[0013] Referring to FIG. 2, the vibration generating device (1) according to the present invention comprises a frame (10) forming the outer shape of the vibration generating device (1), a voice coil (20) coupled to the frame (10), a magnetic circuit section (30) forming a magnetic circuit, and a weight (40) positioned so as to be spaced apart from the magnetic circuit section (30) along the height direction (HD arrow direction). The magnetic circuit section (30) comprises a first magnet (31) forming a magnetic field, a second magnet (32) forming a magnetic field at a position spaced apart from the first magnet (31), and a pole piece (33) positioned between the first magnet (31) and the second magnet (32). In this case, the first magnet (31) and the second magnet (32) are arranged so that their magnetic poles face each other, so that the magnetism is concentrated toward the pole piece (33). Accordingly, the vibration generating device (1) according to the present invention can be implemented so that a strong magnetic field is concentrated or emitted toward the pole piece (33) positioned between the first magnet (31) and the second magnet (32). Therefore, the vibration generating device (1) according to the present invention can generate a strong vibration force through the magnetic field concentrated by the first magnet (31) and the second magnet (32).

[0014] The above frame (10), the voice coil (20), and the magnetic circuit part (30) will be described in detail below with reference to the attached drawings.

[0015] Referring to FIG. 2, the frame (10) forms the outer shape of the vibration generating device (1). Components of the vibration generating device (1) according to the present invention may be attached to the frame (10). Components of the vibration generating device (1) according to the present invention may be installed inside the frame (10). For example, the voice coil (20), the magnetic circuit part (30), the weight body (40), etc. may be installed inside the frame (10).

[0016] Referring to FIG. 2, the voice coil (20) is coupled to the frame (10). The voice coil (20) may be coupled to the frame (10) so as to be placed on the magnetic circuit formed by the magnetic circuit section (30). Specifically, the voice coil (20) may be placed on the path of movement of the magnetic field formed by the first magnet (31) or the second magnet (32). When power is applied to the voice coil (20), the vibration generating device (1) according to the present invention can generate a force up and down based on the height direction (HD arrow direction) through interaction with the magnetic field formed by the first magnet (31) or the second magnet (32).

[0017] Referring to FIG. 2, the magnetic circuit section (30) forms a magnetic circuit. The magnetic circuit section (30) can form a magnetic circuit on the inside of the frame (10). The magnetic circuit section (30) can be installed on the frame (10). In this case, the magnetic circuit section (30) can be installed on the frame (10) so as to be spaced apart from the inner wall of the frame (10). The magnetic circuit section (30) may include the first magnet (31), the second magnet (32), and the pole piece (33) to form a magnetic circuit.

[0018] Referring to FIG. 2, the first magnet (31) forms a magnetic field. The first magnet (31) can be installed inside the frame (10) to form a magnetic field inside the frame (10). The first magnet (31) can be positioned above the pole piece (33) with respect to the height direction (HD arrow direction). The first magnet (31) can form a magnetic circuit together with the second magnet (32) and the pole piece (33).

[0019] Referring to FIG. 2, the second magnet (32) forms a magnetic field at a position spaced apart from the first magnet (31). The second magnet (32) can be installed on the frame (10) so as to be spaced apart from the first magnet (31). Accordingly, the second magnet (32) can form a magnetic field at a position spaced apart from the magnetic field formed by the first magnet (31). The first magnet (31) and the second magnet (32) can be arranged spaced apart from each other. The second magnet (32) can be placed on the lower side of the pole piece (33) with respect to the height direction (HD arrow direction). The pole piece (33) can be placed between the first magnet (31) and the second magnet (32). The second magnet (32) may be positioned so that its magnetic poles face the first magnet (31). Accordingly, the vibration generating device (1) according to the present invention may concentrate a magnetic field in the direction where the first magnet (31) and the second magnet (32) face each other. For example, with respect to the height direction (HD arrow direction), the N pole may be positioned on the lower side of the first magnet (31) and the N pole may be positioned on the upper side of the second magnet (32). Conversely, with respect to the height direction (HD arrow direction), the S pole may be positioned on the lower side of the first magnet (31) and the S pole may be positioned on the upper side of the second magnet (32). Accordingly, the vibration generating device (1) according to the present invention can concentrate the magnetic field formed by the first magnet (31) and the second magnet (32) on the pole piece (33).

[0020] Referring to FIG. 2, the pole piece (33) is positioned between the first magnet (31) and the second magnet. The pole piece (33) can be positioned between the first magnet (31) and the second magnet (32) with respect to the height direction (HD arrow direction). The first magnet (31) can be positioned on the upper side of the pole piece (33) with respect to the height direction (HD arrow direction). The second magnet (32) can be positioned on the lower side of the pole piece (33) with respect to the height direction (HD arrow direction). In this way, the first magnet (31) and the second magnet (32) can be positioned on both sides of the pole piece (33) with respect to the height direction (HD arrow direction). The pole piece (33) can be positioned so as to be spaced apart from the inner wall of the frame (10). In this case, the pole piece (33) may be positioned so as to be spaced apart from the inner wall of the frame (10) along the width direction (WD arrow direction) perpendicular to the height direction (HD arrow direction). Accordingly, the vibration generating device (1) according to the present invention may form a magnetic gap (30a) for distributing a magnetic field between the pole piece (33) and the inner wall of the frame (10) along the width direction (WD arrow direction). The pole piece (33) may distribute the magnetic field formed by the first magnet (31) and the second magnet (32) into the magnetic gap (30a). The pole piece (33) may be positioned at the same height as the voice coil (20) with respect to the height direction (HD arrow direction). Accordingly, the pole piece (33) may be positioned to overlap with the voice coil (20) with respect to the width direction (WD arrow direction) perpendicular to the height direction (HD arrow direction). The above pole piece (33) can radiate the magnetic field concentrated by the first magnet (31) and the second magnet (32) toward the voice coil (20).Through this, the magnetic field emitted in the vibration generating device (1) according to the present invention interacts with the voice coil (20). For example, the magnetic field formed by the first magnet (31) and the second magnet (32) can be emitted outwardly from the pole piece (33) toward the frame (10). In this case, when power is applied to the voice coil (20), a force exerted by the magnetic field acts on the voice coil (20). When the direction of the current flowing through the voice coil (20) is clockwise with respect to the center (C) of the frame (10), the direction of action of the force exerted by the magnetic field is directed upward (direction of arrow DD) with respect to the height direction (direction of arrow HD) according to Fleming's left-hand rule. On the other hand, if the direction of the current flowing through the voice coil (20) is counterclockwise relative to the frame (10), the direction of action of the force exerted by the magnetic field is directed downward (direction of the DD arrow) relative to the height direction (direction of the HD arrow) according to Fleming's left-hand rule. In this way, the vibration generating device (1) according to the present invention can generate an upward and downward vibration force through the interaction between the voice coil (20) and the magnetic circuit part (30). Accordingly, the vibration generating device (1) according to the present invention can cause the force generated by the voice coil (20) to vibrate the magnetic circuit part (30). In this case, the magnetic circuit part (30) can vibrate to have a first vibration frequency along the height direction (direction of the HD arrow). Accordingly, the vibration generating device (1) according to the present invention can vibrate at a first vibration frequency through the magnetic circuit part (30).

[0021] Referring to FIG. 2, the voice coil (20) can be positioned to overlap the pole piece (33) along the width direction (WD arrow direction) so that a magnetic field radiating outward from the pole piece (33) acts on the voice coil (20) with respect to the width direction (WD arrow direction). With respect to the width direction (WD arrow direction), the voice coil (20) can be positioned between the pole piece (33) and the inner wall of the frame (10). That is, the voice coil (20) can be positioned in the magnetic gap (30a). Accordingly, the vibration generating device (1) according to the present invention can interact with the magnetic field distributed in the magnetic gap (30a) through the voice coil (20). The voice coil (20) can be positioned at approximately the same height as the pole piece (33) with respect to the height direction (HD arrow direction). Specifically, the bottom of the voice coil (20) may be positioned lower than the bottom of the pole piece (33) with respect to the height direction (HD arrow direction), and the top of the voice coil (20) may be positioned higher than the top of the pole piece (33) with respect to the height direction (HD arrow direction). The voice coil (20) may have a longer length than the pole piece (33) with respect to the height direction (HD arrow direction).

[0022] Referring to FIG. 2, the vibration generating device (1) according to the present invention may include a weight (40).

[0023] The weight (40) is positioned so as to be spaced apart from the magnetic circuit (30) along the height direction (HD arrow direction). The weight (40) may be positioned so as to be spaced downward from the magnetic circuit (30) with respect to the height direction (HD arrow direction). The weight (40) may vibrate as the magnetic circuit (30) vibrates. In this case, the weight (40) may vibrate at a second resonant frequency different from the first resonant frequency. Accordingly, the vibration generating device (1) according to the present invention can generate vibrations at different frequencies through the magnetic circuit (30) and the weight (40). Therefore, the vibration generating device (1) according to the present invention can generate vibrations of various intensities by adjusting the intensity of the vibration at the first resonant frequency and the second resonant frequency.

[0024] Referring to FIG. 2, the vibration generating device (1) according to the present invention may include a fixed part (50).

[0025] The above fixing part (50) is intended to fix the voice coil (20). The above fixing part (50) can be coupled to the inner wall of the frame (10) to support the voice coil (20). In this case, the above fixing part (50) can support the voice coil (20) from the upper and lower sides with respect to the height direction (HD arrow direction). Accordingly, the vibration generating device (1) according to the present invention can position the voice coil (20) at a position overlapping with the pole piece (33) with respect to the width direction (WD arrow direction). The above fixing part (50) can be positioned between the frame (10) and the magnetic circuit part (30). The above fixing part (50) can be positioned between the inner wall of the frame (10) and the magnetic circuit part (30) with respect to the width direction (WD arrow direction).

[0026] Referring to FIG. 2, the vibration generating device (1) according to the present invention may include a first support member (60).

[0027] The first support member (60) is intended to support the magnetic circuit member (30). The first support member (60) can support the magnetic circuit member (30) from the upper side of the magnetic circuit member (30) based on the height direction (HD arrow direction). The first support member (60) may include a first elastic member (61) and a first bracket (62) to support the magnetic circuit member (30).

[0028] The first elastic member (61) is positioned so as to be spaced apart from the upper side of the magnetic circuit section (30) along the height direction (HD arrow direction). The first elastic member (61) may be coupled to the inner wall of the frame (10). The first elastic member (61) may be coupled to be fixed to the frame (10). The first elastic member (61) may be made of an elastic body having elasticity. For example, a spring, a leaf spring, etc. may correspond to the elastic body.

[0029] The first bracket (62) can connect the magnetic circuit section (30) and the first elastic member (61) respectively. Accordingly, the vibration generating device (1) according to the present invention can transmit the vibration force generated in the magnetic circuit section (30) to the first elastic member (61) by the first bracket (62). Therefore, the vibration generating device (1) according to the present invention can cushion the vibration transmitted as the magnetic circuit section (30) vibrates through the first elastic member (61). As shown in FIG. 3, the vibration generating device (1) according to the present invention can be implemented so that the first elastic member (61) cushions the vibration when the magnetic circuit section (30) vibrates in the upward direction (DD arrow direction) relative to the height direction (HD arrow direction). The first bracket (62) can be positioned between the first elastic member (61) and the magnetic circuit part (30) based on the height direction (HD arrow direction).

[0030] Referring to FIG. 2, the vibration generating device (1) according to the present invention may include a second support member (70).

[0031] The second support member (70) supports the magnetic circuit member (30) at a position spaced apart from the first support member (60) based on the height direction (HD arrow direction). The second support member (70) may support the magnetic circuit member (30) from the lower side of the magnetic circuit member (30) based on the height direction (HD arrow direction). The second support member (70) may be positioned between the magnetic circuit member (30) and the weight body (40) based on the height direction (HD arrow direction). The second support member (70) may include a second elastic member (71) and a second bracket (72) to support the magnetic circuit member (30).

[0032] The second elastic member (71) is positioned so as to be spaced downward from the magnetic circuit section (30) along the height direction (HD arrow direction). The second elastic member (71) may be coupled to the inner wall of the frame (10). The second elastic member (71) may be coupled to be fixed to the frame (10). The second elastic member (71) may be made of an elastic body having elasticity. For example, a spring, a leaf spring, etc. may be the elastic body.

[0033] The second bracket (72) can connect the magnetic circuit part (30) and the second elastic member (71) respectively. Accordingly, the vibration generating device (1) according to the present invention can transmit the vibration force generated in the magnetic circuit part (30) to the second elastic member (71) by the second bracket (72). Therefore, the vibration generating device (1) according to the present invention can cushion the vibration transmitted as the magnetic circuit part (30) vibrates through the second elastic member (71). As shown in FIG. 4, the vibration generating device (1) according to the present invention can be implemented so that the second elastic member (71) cushions the vibration when the magnetic circuit part (30) vibrates in the downward direction (DD arrow direction) relative to the height direction (HD arrow direction). Thus, the vibration generating device (1) according to the present invention is implemented such that the first support member (60) and the second support member (70) support the magnetic circuit member (30) from the upper and lower sides of the magnetic circuit member (30). In this case, the first vibration frequency of the magnetic circuit member (30) can be determined by the mass of the magnetic circuit member (30) and the elastic modulus of the first elastic member (61) and the second elastic member (71). The second bracket (72) can be positioned between the second bracket (72) and the magnetic circuit member (30) based on the height direction (HD arrow direction).

[0034] Referring to FIG. 2, the vibration generating device (1) according to the present invention may include a third support member (80).

[0035] The third support member (80) is intended to support the weight body (40). The third support member (80) can support the weight body (40) from the upper side of the weight body (40) with respect to the height direction (HD arrow direction). The third support member (80) can be positioned between the second support member (70) and the weight body (40) with respect to the height direction (HD arrow direction). The third support member (80) may include a third elastic member (81) and a third bracket (82) to support the weight body (40).

[0036] The third elastic member (81) is connected to the weight body (40) from the upper side along the height direction (HD arrow direction). The third elastic member (81) can be directly coupled to the weight body (40). The third elastic member (81) may be made of an elastic body having elasticity. For example, a spring, a leaf spring, etc. may be the elastic body.

[0037] The third bracket (82) can connect the second support member (70) and the third elastic member (81) respectively. Accordingly, the vibration generating device (1) according to the present invention can transmit the vibration force generated in the magnetic circuit member (30) to the third elastic member (81) by the third bracket (82). Therefore, the vibration generating device (1) according to the present invention can not only transmit the vibration transmitted as the magnetic circuit member (30) vibrates through the third elastic member (81) to the weight (40), but can also be implemented to cushion the vibration when the weight (40) vibrates in the upward direction (DD arrow direction) relative to the height direction (HD arrow direction), as shown in FIG. 5. In the vibration generating device (1) according to the present invention, the vibration generated as the magnetic circuit part (30) vibrates in the downward direction (DD arrow direction) relative to the height direction (HD arrow direction) can be transmitted to the weight body (40) through the third support part (80). The third bracket (82) can be positioned between the second elastic member (71) and the third elastic member (81) relative to the height direction (HD arrow direction).

[0038] Referring to FIG. 2, the vibration generating device (1) according to the present invention may include a fourth support member (90).

[0039] The fourth support member (90) supports the weight body (40) at a position spaced apart from the third support member (80) based on the height direction (HD arrow direction). The fourth support member (90) can support the weight body (40) from the lower side of the weight body (40) based on the height direction (HD arrow direction). The fourth support member (90) can be positioned on the lower side of the weight body (40) based on the height direction (HD arrow direction). The fourth support member (90) may include a fourth elastic member (91) to support the weight body (40).

[0040] The fourth elastic member (91) is positioned to be connected to the lower side of the weight body (40) along the height direction (HD arrow direction). The fourth elastic member (91) may be coupled to the inner wall of the frame (10). The fourth elastic member (91) may be coupled to be fixed to the frame (10). The fourth elastic member (91) may be made of an elastic body having elasticity. For example, a spring, a leaf spring, etc. may correspond to the elastic body. The vibration generating device (1) according to the present invention can cushion the vibration transmitted as the weight body (40) vibrates through the fourth elastic member (91). As illustrated in FIG. 6, the vibration generating device (1) according to the present invention can be implemented such that when the weight (40) vibrates in the downward direction (DD arrow direction) relative to the height direction (HD arrow direction), the fourth elastic member (91) cushions the vibration.

[0041] Referring to FIG. 7, in the vibration generating device (1) according to the present invention, a weight body (40) according to one embodiment can be implemented as follows. In this case, the length of the weight body (40) may be longer than the length of the magnetic circuit part (30) with respect to the height direction (HD arrow direction). Accordingly, in the vibration generating device (1) according to the present invention, by changing the length of the weight body (40), the vibration frequency generated from the weight body (40) can be adjusted.

[0042] Referring to FIG. 8, in the vibration generating device (1) according to the present invention, a weight (40) according to another embodiment can be implemented as follows. In this case, the outer diameter of the weight (40) with respect to the center of the frame in the width direction (WD arrow direction) may be longer than the outer diameter of the magnetic circuit part (30). Accordingly, in the vibration generating device (1) according to the present invention, by changing the diameter of the weight (40), the vibration frequency generated from the weight (40) can be adjusted.

[0043] It will be obvious to those skilled in the art that the invention described above is not limited to the aforementioned embodiments and attached drawings, and that various substitutions, modifications, and changes are possible within the scope of the technical concept of the invention. Explanation of the symbols

[0044] 1: Vibration generator 10: Frame 20: Voice coil 30: Magnetic circuit section 30a: Magnetic gap 31: First magnet 32: Second Magnet 33: Pole Piece 40: Weight 50: Fixed part 60: 1st Support Section 61: First elastic member 62: First bracket 70: 2nd Support Section 71: Second elastic member 72: Second bracket 80: 3rd Support Division 81: Third elastic member 82: Third bracket 90: 4th Support Section 91: 4th elastic member

Claims

Claim 1 A frame forming the outer shape of a vibration generating device; a voice coil coupled to the frame; a magnetic circuit part forming a magnetic circuit; and includes a weight body positioned so as to be spaced apart from the magnetic circuit section based on the height direction, wherein the magnetic circuit section includes a first magnet that generates a magnetic field, a second magnet that forms a magnetic field at a position spaced apart from the first magnet, and a pole piece positioned between the first magnet and the second magnet, wherein the magnetic poles of the first magnet and the second magnet are positioned facing each other so that the magnetic field is concentrated toward the pole piece, and includes a first support member for supporting the magnetic circuit section, wherein the first support member includes a first elastic member positioned so as to be spaced apart from the upper side of the magnetic circuit section along the height direction, and a first bracket connecting each of the magnetic circuit section and the first elastic member, and includes a second support member for supporting the magnetic circuit section at a position spaced apart from the first support member based on the height direction, wherein the second support member is positioned so as to be spaced apart from the lower side of the magnetic circuit section along the height direction A vibration generating device characterized by comprising a second elastic member and a second bracket connecting the magnetic circuit and the second elastic member, and a third support member for supporting the weight, wherein the third support member includes a third elastic member connected to the weight at the upper side along the height direction and a third bracket connecting the third elastic member and the second bracket, and a fourth support member for supporting the weight at a position spaced apart from the third support member, wherein the fourth support member includes a fourth elastic member connected to the weight at the lower side along the height direction. Claim 2 A vibration generating device according to claim 1, characterized in that the voice coil is arranged so as to overlap in height with the pole piece along the width direction, such that a magnetic field radiating outward from the pole piece with respect to the height direction acts on the voice coil. Claim 3 A vibration generating device according to paragraph 2, characterized in that the lower end of the voice coil is positioned lower than the lower end of the pole piece based on the height direction, and the upper end of the voice coil is positioned higher than the upper end of the pole piece based on the height direction. Claim 4 A vibration generating device according to claim 1, wherein the voice coil includes a fixing part for fixing, and with respect to the height direction, the fixing part is coupled to the inner wall of the frame to support the voice coil from the upper and lower sides. Claim 5 delete Claim 6 delete Claim 7 delete Claim 8 delete Claim 9 A vibration generating device according to claim 1, characterized in that, based on the height direction, the length of the weight body is longer than the length of the magnetic circuit part. Claim 10 A vibration generating device according to claim 1, characterized in that, based on the width direction perpendicular to the height direction, the outer diameter of the weight body is longer than the outer diameter of the magnetic circuit part with respect to the center of the frame.

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