US-20260129325-A1 - VIBRATION TRANSMISSION PLATES, LOUDSPEAKER ASSEMBLIES, AND BONE-CONDUCTION EARPHONES

US20260129325A1US 20260129325 A1US20260129325 A1US 20260129325A1US-20260129325-A1

Abstract

The present disclosure relates to a vibration transmission plate, a loudspeaker assembly, and a bone-conduction earphone. The vibration transmission plate includes an inner ring body, an outer ring body, a first connecting rod, and a second connecting rod. The inner ring body includes a first inner ring edge including two first straight line segments and two first curved segments. The outer ring body includes a first outer ring edge including two second straight line segments and two second curved segments. The first connecting rod includes a first inner connecting portion, a first outer connecting portion, and a straight extending portion located within a straight gap. The second connecting rod includes a second inner connecting portion, a second outer connecting portion, and a curved extending portion located within a curved gap.

Inventors

Junjiang FU
SHUAI LIU

Assignees

Shenzhen Shokz Co., Ltd.

Dates

Publication Date: 20260507
Application Date: 20251228

Claims (20)

1 . A vibration transmission plate, comprising an inner ring body, an outer ring body surrounding the inner ring body, and a first connecting rod and a second connecting rod connected between the inner ring body and the outer ring body, wherein the inner ring body includes a first inner ring edge adjacent to the outer ring body, the first inner ring edge includes two first straight line segments and two first curved segments, the two first straight line segments are arranged side by side and opposite to each other, and the two first curved segments are respectively connected to adjacent ends of the two first straight line segments and protrude toward an outside of the vibration transmission plate; the outer ring body includes a first outer ring edge adjacent to the inner ring body, the first outer ring edge includes two second straight line segments respectively located outside the two first straight line segments and two second curved segments respectively located outside the two first curved segments, such that a straight gap is formed between each pair of adjacent first straight line segment and second straight line segment, and a curved gap is formed between each pair of adjacent first curved segment and second curved segment; the first connecting rod includes a first inner connecting portion connected to the first inner ring edge, a first outer connecting portion connected to the first outer ring edge, and a straight extending portion connected between the first inner connecting portion and the first outer connecting portion and located within the straight gap; and the second connecting rod includes a second inner connecting portion connected to the first inner ring edge, a second outer connecting portion connected to the first outer ring edge, and a curved extending portion connected between the second inner connecting portion and the second outer connecting portion and located within the curved gap.
2 . The vibration transmission plate of claim 1 , wherein there are two first connecting rods and two second connecting rods, and the two first connecting rods and the two second connecting rods are 180 degrees rotationally symmetrical relative to a centroid or center of mass of the inner ring body.
3 . The vibration transmission plate of claim 1 , wherein the first inner connecting portion is adjacent to the second outer connecting portion, and the first outer connecting portion is adjacent to the second inner connecting portion.
4 . The vibration transmission plate of claim 1 , wherein the first curved segment, the second curved segment, and an inner edge and an outer edge of the curved extending portion are arranged in circular arc shapes with a common center of a circle, and the first straight line segment, the second straight line segment, and an inner edge and an outer edge of the straight extending portion are arranged parallel to each other.
5 . The vibration transmission plate of claim 1 , wherein an inner edge of the curved extending portion is arranged in a circular arc shape, an inner edge of the second inner connecting portion includes a first circular arc segment connected to the first inner ring edge and a second circular arc segment that connects the first circular arc segment and the inner edge of the curved extending portion, a ratio of a diameter of the first circular arc segment to a diameter of the inner edge of the curved extending portion is in a range of 0.02 to 0.03, a ratio of a diameter of the second circular arc segment to the diameter of the inner edge of the curved extending portion is in a range of 0.11 to 0.14, and the first circular arc segment and the second circular arc segment are concave arcs.
6 . The vibration transmission plate of claim 5 , wherein an outer edge of the second inner connecting portion includes a third circular arc segment connected to the first inner ring edge and a fourth circular arc segment that connects the third circular arc segment and an outer edge of the curved extending portion, a ratio of a diameter of the third circular arc segment to the diameter of the inner edge of the curved extending portion is in a range of 0.16 to 0.2, a ratio of a diameter of the fourth circular arc segment to the diameter of the inner edge of the curved extending portion is in a range of 0.16 to 0.2, the third circular arc segment is a concave arc, and the fourth circular arc segment is a convex arc.
7 . The vibration transmission plate of claim 6 , wherein the diameter of the fourth circular arc segment is the same as the diameter of the third circular arc segment.
8 . The vibration transmission plate of claim 6 , wherein a ratio of a straight-line distance from a connection point between the first circular arc segment and the first inner ring edge to a connection point between the third circular arc segment and the first inner ring edge to a width of the curved extending portion is in a range of 2.65 to 3.25.
9 . The vibration transmission plate of claim 6 , wherein the second inner connecting portion is adjacent to the first outer connecting portion, an outer edge of the first outer connecting portion includes a fifth circular arc segment connected to the first outer ring edge and a sixth circular arc segment that connects the fifth circular arc segment and an outer edge of the straight extending portion, a ratio of a diameter of the fifth circular arc segment to the diameter of the inner edge of the curved extending portion is in a range of 0.02 to 0.03, a ratio of a diameter of the sixth circular arc segment to the diameter of the inner edge of the curved extending portion is in a range of 0.11 to 0.14, and the fifth circular arc segment and the sixth circular arc segment are concave arcs.
10 . The vibration transmission plate of claim 9 , wherein the diameter of the fifth circular arc segment is the same as the diameter of the first circular arc segment, and the diameter of the sixth circular arc segment is the same as the diameter of the second circular arc segment.
11 . The vibration transmission plate of claim 9 , wherein an inner edge of the first outer connecting portion includes a seventh circular arc segment connected to the first outer ring edge and an eighth circular arc segment that connects the seventh circular arc segment and an inner edge of the straight extending portion, a connection line between a center of a circle of the fourth circular arc segment and a center of a circle of the eighth circular arc segment has a midpoint, an angle formed between a connection line between the midpoint and a center of a circle of the inner edge of the curved extending portion and a spacing direction between the two first straight line segments is in a range of 8 degrees to 18 degrees, the seventh circular arc segment is a concave arc, and the eighth circular arc segment is a convex arc.
12 . The vibration transmission plate of claim 11 , wherein a ratio of a connection length between the center of the circle of the fourth circular arc segment and the center of the circle of the eighth circular arc segment to a width of the curved extending portion or a width of the straight extending portion is in a range of 3.71 to 4.54, or a ratio of a diameter of the seventh circular arc segment to the diameter of the inner edge of the curved extending portion is in a range of 0.16 to 0.2, and a ratio of a diameter of the eighth circular arc segment to the diameter of the inner edge of the curved extending portion is in a range of 0.16 to 0.2.
13 . The vibration transmission plate of claim 11 , wherein a straight-line distance from a connection point between the fifth circular arc segment and the first outer ring edge to a connection point between the seventh circular arc segment and the first outer ring edge is greater than a straight-line distance from a connection point between the first circular arc segment and the first inner ring edge to a connection point between the third circular arc segment and the first inner ring edge.
14 . The vibration transmission plate of claim 1 , wherein a connection between the first connecting rod and the first inner ring edge and a connection between the first connecting rod and the first outer ring edge are smooth transition connections; and a connection between the second connecting rod and the first inner ring edge and a connection between the second connecting rod and the first outer ring edge are smooth transition connections.
15 . The vibration transmission plate of claim 1 , wherein the outer ring body includes the first outer ring edge adjacent to the inner ring body and a second outer ring edge away from the inner ring body; and a positioning protrusion is arranged on the second outer ring edge, and the positioning protrusion protrudes toward the outside of the vibration transmission plate.
16 . The vibration transmission plate of claim 15 , wherein the second outer ring edge includes two first sub-straight line segments and two first sub-curved segments, the two first sub-straight line segments are arranged side by side and opposite to each other, the two first sub-curved segments are respectively connected to adjacent ends of the two first sub-straight line segments and protrude toward the outside of the vibration transmission plate; and the positioning protrusion is arranged on the first sub-straight line segments.
17 . The vibration transmission plate of claim 16 , wherein a first sub-straight line segment of the first sub-straight line segments is further provided with a positioning groove recessed toward the inner ring body; and the positioning groove and the positioning protrusion are staggered from each other along a circumferential direction of the second outer ring edge.
18 . The vibration transmission plate of claim 15 , wherein a protrusion length of each positioning protrusion relative to the second outer ring edge is in a range of 0.315 mm to 0.385 mm, and a protrusion width of each positioning protrusion relative to the second outer ring edge is in a range of 0.378 mm to 0.462 mm.
19 . A loudspeaker assembly, comprising a transducer device, wherein the transducer device includes a voice coil, a bracket, a magnetic circuit system, and the vibration transmission plate of claim 1 , the inner ring body of the vibration transmission plate is connected to the bracket, the outer ring body of the vibration transmission plate is connected to the magnetic circuit system to elastically suspend the magnetic circuit system on a periphery of the bracket, and the voice coil is arranged on the bracket.
20 . A bone-conduction earphone, comprising the vibration transmission plate of claim 1 .

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This application is a Continuation of International Patent Application No. PCT/CN2024/102587, filed on Jun. 28, 2024, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD The present disclosure relates to the technical field of electronic devices, and in particular, to a vibration transmission plate, a loudspeaker assembly, and a bone-conduction earphone. BACKGROUND With the increasing prevalence of electronic devices, they have become indispensable tools for social interaction and entertainment, while user expectations for such devices continue to rise. Electronic devices such as earphones can be used in conjunction with terminal devices such as mobile phones and computers to deliver an enhanced auditory experience, and have thus become widely integrated into daily life. Conventional bone-conduction earphones are typically equipped with a magnetic circuit and an electric circuit that interact through electromagnetic induction, enabling the earphones to vibrate and achieve bone conduction. A vibration transmission plate is typically provided to couple the magnetic circuit and the electric circuit, so as to relatively constrain their positions. However, during the relative movement between the magnetic circuit and the electric circuit, the vibration transmission plate is susceptible to damage, deformation, or even fracture. SUMMARY The present disclosure provides a vibration transmission plate, a loudspeaker assembly, and a bone-conduction earphone, which can increase the stiffness of the vibration transmission plate and improve the reliability and service life of the vibration transmission plate. On the one hand, the present disclosure provides a vibration transmission plate, comprising an inner ring body, an outer ring body surrounding the inner ring body, and a first connecting rod and a second connecting rod connected between the inner ring body and the outer ring body. The inner ring body includes a first inner ring edge adjacent to the outer ring body, and the first inner ring edge includes two first straight line segments and two first curved segments, the two first straight line segments are arranged side by side and opposite to each other, and the two first curved segments are respectively connected to adjacent ends of the two first straight line segments and protrude toward an outside of the vibration transmission plate. The outer ring body includes a first outer ring edge adjacent to the inner ring body, and the first outer ring edge includes two second straight line segments respectively located outside the two first straight line segments and two second curved segments respectively located outside the two first curved segments, such that a straight gap is formed between each pair of adjacent first straight line segment and second straight line segment, and a curved gap is formed between each pair of adjacent first curved segment and second curved segment. The first connecting rod includes a first inner connecting portion connected to the first inner ring edge, a first outer connecting portion connected to the first outer ring edge, and a straight extending portion connected between the first inner connecting portion and the first outer connecting portion and located within the straight gap. The second connecting rod includes a second inner connecting portion connected to the first inner ring edge, a second outer connecting portion connected to the first outer ring edge, and a curved extending portion connected between the second inner connecting portion and the second outer connecting portion and located within the curved gap. In some embodiments, there are two first connecting rods and two second connecting rods, and the two first connecting rods and the two second connecting rods are 180 degrees rotationally symmetrical relative to a centroid or center of mass of the inner ring body. In some embodiments, the first inner connecting portion is adjacent to the second outer connecting portion, and the first outer connecting portion is adjacent to the second inner connecting portion. In some embodiments, the first curved segment, the second curved segment, and an inner edge and an outer edge of the curved extending portion are arranged in circular arc shapes with a common center of a circle, and the first straight line segment, the second straight line segment, and an inner edge and an outer edge of the straight extending portion are arranged parallel to each other. In some embodiments, an inner edge of the curved extending portion is arranged in a circular arc shape, an inner edge of the second inner connecting portion includes a first circular arc segment that connects the first inner ring edge and a second circular arc segment that connects the first circular arc segment and the inner edge of the curved extending portion, a ratio of a diameter of the first circular arc segment to a diameter of the inner edge of the curved exte