Bone conduction loudspeaker for improving tone quality of bone conduction loudspeaker

Abstract

The invention relates to the field of bone conduction earphones, in particular to a bone conduction loudspeaker capable of improving the tone quality of the bone conduction loudspeaker, which comprises a first earphone with an opening on one side and a hearing aid chip body inside, and a chip connector is fixedly connected inside the first earphone. A slot is formed in the side, close to the opening, of the chip connector, vibration rods are fixedly connected to the two ends of the chip connector, and a push wheel, a bearing and a first screw are arranged so that a vibration piece can be conveniently and rapidly driven to ascend and descend under the sliding limiting effect of a second sliding groove and a first sliding block; therefore, a chip can be stably clamped under the sliding limiting action of an electric telescopic rod, a sliding rod and a fourth sliding groove, and meanwhile, automatic lifting, moving, clamping and replacing can be automatically carried out when the vibration chip is replaced under the sliding limiting action of a driving motor, a second threaded sleeve, a second threaded rod, a second sliding block and a third sliding groove; the automation degree is high, the internal vibration sheet can be rapidly replaced, and the maintenance efficiency is improved.

Description

Technical Field

[0001] The invention relates to the field of bone conduction earphones, in particular to a bone conduction speaker for improving the sound quality of the bone conduction speaker. Background Art

[0002] Bone conduction headphones are also called bone conduction headphones, bone-sensing headphones, bone conduction headphones and bone sensor headphones. They are headphones made using bone conduction technology. Compared with the classic sound conduction method that generates sound waves through the diaphragm, bone conduction can achieve clear sound restoration in a noisy environment, and the sound waves will not affect others because they diffuse in the air. When the wearer of a traditional bone conduction headset sends an audio signal to the command center, the wearer blocks his ears and shouts loudly to "amplify" the wearer's voice, while reducing the interference of the surrounding environment, so as to achieve the purpose of effective communication with the command center. Bone conduction speakers are also a type of bone conduction headphones, and have the same function as bone conduction headphones.

[0003] In the existing market, bone conduction technology is mostly used in the military market. At the same time, with the continuous in-depth research on the technology, it is gradually moving towards people's daily life. Because its sound conduction is achieved by vibration transmission, it has strong anti-interference ability and does not need to receive sound through the external auditory canal for transmission. In daily life, you can receive information from the outside world while freeing your ears. Existing bone conduction speakers (bone conduction vibrators with a moving iron structure in the military field) cannot have the same frequency response curve as traditional speakers due to the constraints of their structure and material properties, which makes it difficult for them to have a place in the civilian market. The use scenarios are greatly limited. In addition, the current bone conduction speakers convert external sounds into bone conduction signals for transmission through the vibration chip inside the sound wave converter inside the earphone. However, when the vibration piece inside the bone conduction speaker is damaged and replaced, the earphone needs to be disassembled and repaired as a whole. In addition, manual repair increases the replacement time of the vibration piece, which is inconvenient to use. In addition, the bone conduction speaker transmits sound through the bones when in use, but there is no bone conduction transmission inside the ear, which leads to unclear sound wave transmission during use, low sound, inconvenient use, and cannot significantly improve the sound quality of the bone conduction speaker. Summary of the invention

[0004] In view of the problems in the prior art, the present invention provides a bone conduction speaker which improves the sound quality of the bone conduction speaker.

[0005] The technical solution adopted by the present invention to solve its technical problem is: a bone conduction speaker for improving the sound quality of a bone conduction speaker, comprising a first earphone with an opening on one side and a hearing aid chip body inside, a chip connector fixedly connected inside the first earphone, a slot is provided on the side of the chip connector close to the opening, vibration rods are fixedly connected at both ends of the chip connector, both ends of the vibration rods extend to the outside of the first earphone and are fixedly connected to vibration plates, a connecting line is fixedly connected at the other side of the first earphone, the connecting line is electrically connected to the chip connector, and a second earphone is fixedly connected at the lower end of the connecting line, a mounting shell is fixedly connected at the side of the first earphone close to the opening, a first through-opening is provided through the side of the mounting shell close to the first earphone, first sliding grooves are symmetrically provided on the outer side walls of the mounting shell at both ends of the first through-opening, a second through-opening is provided through the bottom end of the mounting shell, a second sliding groove is provided on the inner wall of the mounting shell on the side away from the first earphone, and a mounting The side wall of the shell is penetrated by a third through-hole, and the inner walls of both ends of the side of the mounting shell near the second sliding groove are rotatably connected to the first screw through the bearing, and the rod wall near the upper end of the first screw is fixedly sleeved with a push wheel, and one side of the push wheel extends into the inside of the third through-hole, and the rod wall at the lower end of the first screw is threadedly connected to the first screw sleeve, and the side of the first screw sleeve near the second sliding groove is fixedly connected to the first sliding block, and the first sliding block is slidably connected to the second sliding block, and the first sliding block is fixedly connected to the mounting bracket on the side away from the second sliding groove. The third sliding groove is opened in the top of the mounting bracket, and the inner wall of one side of the mounting bracket is fixedly connected to the driving motor, and the driving motor output end is fixedly connected to the second screw, and the other side of the second screw is rotatably connected to the mounting bracket through the bearing, the second screw stem is threadedly connected to the second screw sleeve, the upper end of the second screw sleeve is fixedly connected to the second sliding block, and the upper end of the second sliding block is slidably connected in the third sliding groove, and one side of the lower surface of the second screw sleeve is fixedly connected to a support rod, and the lower end of the support rod is fixedly connected to a clamping mechanism.

[0006] Specifically, the clamping mechanism includes a U-shaped plate, which is fixedly connected to the lower end of the support rod, and a fourth slide groove is provided on the inner wall of one side of the U-shaped plate, and electric telescopic rods are fixedly connected to both ends of the U-shaped plate in a symmetrical manner, and the output ends of the electric telescopic rods are fixedly connected to clamp plates, and a sliding rod is fixedly connected to one side of the clamp plate close to the fourth slide groove, and the sliding rod is slidably connected in the fourth slide groove, and clamping grooves are provided at opposite ends of the clamp plates, and the clamping grooves jointly clamp the vibration chip.

[0007] Specifically, a third slider is slidably connected in the first sliding groove, a shielding ring is fixedly connected to the side of the third slider away from the mounting shell, a sealing groove is provided on the side of the shielding ring away from the mounting shell, a mounting groove is provided at one end of the shielding ring close to the first earphone, and a magnetic block is fixedly connected in the mounting groove.

[0008] Specifically, a card block is movably connected in the third through-hole, a through groove is provided on the side of the card block close to the push wheel, the through groove is sleeved on the outside of the push wheel, a side of the card block away from the mounting shell is fixedly connected to a side plate, and a pull ring is fixedly connected to the side of the side plate away from the mounting shell.

[0009] Specifically, a corresponding soft cover is fixedly connected to the lower end of the second through-hole.

[0010] Specifically, a limiting block is fixedly connected to the top of the mounting shell, and the limiting block and the slot are arranged in corresponding heights.

[0011] Specifically, an arc-shaped ring is fixedly connected to one side of the upper end of the mounting shell, and the arc-shaped ring fits the human ear.

[0012] Beneficial effects of the present invention: (1) The bone conduction speaker for improving the sound quality of the bone conduction speaker described in the present invention can be easily moved up and down by setting a push wheel, a bearing and a first screw rod when the vibration plate needs to be replaced under the sliding limit function of the second slide groove and the first slider, so that the chip can be stably clamped under the sliding limit function of the electric telescopic rod, the slide rod and the fourth slide groove. At the same time, the vibration chip can be automatically lifted, moved and clamped under the sliding limit function of the driving motor, the second screw sleeve, the second screw rod, the second slider and the third slide groove when the vibration chip is replaced. The automation level is high, and the internal vibration plate can be quickly replaced, thereby increasing maintenance efficiency.

[0013] (2) The bone conduction speaker for improving the sound quality of the bone conduction speaker described in the present invention is convenient and quick to move the shielding ring by providing the first sliding groove and the third sliding block, so that when in use, it can cooperate with the magnetic block to form a limit to increase the sealing performance inside the ear, thereby improving the sound quality of the bone conduction speaker. At the same time, the first earphone and the vibration plate are used to perform bone conduction inside the ear, and the second earphone is used to perform bone conduction outside the ear, thereby further improving the sound quality of the bone conduction speaker and transmitting sound more clearly. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0015] Figure 1 A schematic diagram of the overall internal structure of a bone conduction speaker for improving the sound quality of a bone conduction speaker provided by the present invention; Figure 2 A schematic diagram of the structure of a clamping mechanism in a bone conduction speaker for improving the sound quality of the bone conduction speaker provided by the present invention; Figure 3 A bone conduction speaker for improving the sound quality of a bone conduction speaker provided by the present invention Figure 1 A schematic diagram of the enlarged structure of part A; Figure 4 A schematic diagram of the side structure of a mounting shell of a bone conduction speaker for improving the sound quality of the bone conduction speaker provided by the present invention; Figure 5 A schematic diagram of the three-dimensional structure of a first screw in a bone conduction speaker for improving the sound quality of a bone conduction speaker provided by the present invention; Figure 6 A schematic diagram of the side structure of a U-shaped plate in a bone conduction speaker for improving the sound quality of the bone conduction speaker provided by the present invention; Figure 7 This is a schematic diagram of the bottom-up structure of a first screw and a push wheel in a bone conduction speaker for improving the sound quality of the bone conduction speaker provided by the present invention.

[0016] In the figure: 1, mounting shell; 2, third through-hole; 3, second slide groove; 4, second through-hole; 5, first slide groove; 6, first through-hole; 7, first screw rod; 8, push wheel; 9, first screw sleeve; 10, first slider; 11, clamping block; 12, through-hole; 13, side plate; 14, pull ring; 15, mounting frame; 16, third slide groove; 17, driving motor; 18, second screw rod; 19, second screw sleeve; 20, second slider; 21, support rod; 22, clamping machine Structure; 221, U-shaped plate; 222, fourth slide groove; 223, electric telescopic rod; 224, splint; 225, slide rod; 226, clamping groove; 23, first earphone; 24, chip connector; 25, slot; 26, vibration rod; 27, vibration sheet; 28, third slider; 29, shielding ring; 30, sealing groove; 31, mounting groove; 32, magnetic block; 33, soft cover; 34, limit block; 35, arc ring; 36, connecting line; 37, second earphone. Implementation

[0017] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0018] like Figure 1-Figure 7As shown, a bone conduction speaker for improving the sound quality of a bone conduction speaker according to the present invention comprises a first earphone 23 with an opening on one side and a hearing aid chip body inside, a chip connector 24 is fixedly connected inside the first earphone 23, a slot 25 is provided on the side of the chip connector 24 close to the opening, a vibration rod 26 is fixedly connected to both ends of the chip connector 24, both ends of the vibration rod 26 extend to the outside of the first earphone 23 and are fixedly connected to a vibration plate 27, a connecting wire 36 is fixedly connected to the other side of the first earphone 23, the connecting wire 36 is electrically connected to the chip connector 24, and a second earphone 37 is fixedly connected to the lower end of the connecting wire 36, a mounting shell 1 is fixedly connected to the side of the first earphone 23 close to the opening, a first through-opening 6 is penetrated through the side of the mounting shell 1 close to the first earphone 23, first sliding grooves 5 are symmetrically arranged on the outer wall of the mounting shell 1 at both ends of the first through-opening 6, a second through-opening 4 is penetrated through the bottom end of the mounting shell 1, a second sliding groove 3 is provided on the inner wall of the side of the mounting shell 1 away from the first earphone 23, and a side wall of the mounting shell 1 at the upper end of the second sliding groove 3 is penetrated A third through-hole 2 is provided, and the inner walls at both ends of the side of the mounting shell 1 close to the second slide groove 3 are rotatably connected with the first screw rod 7 through bearings, and the rod wall of the first screw rod 7 close to the upper end is fixedly sleeved with a push wheel 8, and one side of the push wheel 8 extends to the inside of the third through-hole 2, and the rod wall at the lower end of the first screw rod 7 is threadedly connected with a first screw sleeve 9, and the side of the first screw sleeve 9 close to the second slide groove 3 is fixedly connected with a first slider 10, and the first slider 10 is slidably connected in the second slide groove 3, and the side of the first screw sleeve 9 away from the second slide groove 3 is fixedly connected with a mounting frame 15, and the top of the mounting frame 15 A third slide groove 16 is provided inside, and a driving motor 17 is fixedly connected to the inner wall of one side of the mounting frame 15, a second screw rod 18 is fixedly connected to the output end of the driving motor 17, the other side of the second screw rod 18 is rotatably connected to the mounting frame 15 through a bearing, a second screw sleeve 19 is threadedly connected to the stem of the second screw rod 18, a second slider 20 is fixedly connected to the upper end of the second screw sleeve 19, the upper end of the second slider 20 is slidably connected to the third slide groove 16, a support rod 21 is fixedly connected to one side of the lower surface of the second screw sleeve 19, and a clamping mechanism 22 is fixedly connected to the lower end of the support rod 21; The clamping mechanism 22 includes a U-shaped plate 221, which is fixedly connected to the lower end of the support rod 21. A fourth slide groove 222 is provided on the inner wall of one side of the U-shaped plate 221. Electric telescopic rods 223 are fixedly connected to both ends of the U-shaped plate 221 in a symmetrical manner. The output ends of the electric telescopic rods 223 are fixedly connected to clamp plates 224. The sides of the clamp plates 224 close to the fourth slide groove 222 are fixedly connected to sliding rods 225. The sliding rods 225 are slidably connected in the fourth slide groove 222, and clamping grooves 226 are provided on the opposite ends of the clamp plates 224. The clamping grooves 226 jointly clamp the vibration chip.

[0019] Specifically, the first slide groove 5 is slidably connected with a third slider 28, the side of the third slider 28 away from the mounting shell 1 is fixedly connected with a shielding ring 29, the side of the shielding ring 29 away from the mounting shell 1 is provided with a sealing groove 30, and the end of the shielding ring 29 close to the first earphone 23 is provided with a mounting groove 31, and the mounting groove 31 is fixedly connected with a magnetic block 32, which is conducive to changing the position of the shielding ring 29 and the sealing groove 30 by sliding the third slider 28 inside the first slide groove 5, so that the magnetic blocks 32 are magnetically connected to each other under the action of the mutual magnetic connection of the ear, so that the ear forms a closed space, thereby increasing the overall bone conduction sound clarity of the first earphone 23.

[0020] Specifically, a card block 11 is movably connected in the third through-hole 2, a through-groove 12 is provided on a side of the card block 11 close to the push wheel 8, the through-groove 12 is sleeved on the outside of the push wheel 8, a side of the card block 11 away from the mounting shell 1 is fixedly connected to a side plate 13, and a side of the side plate 13 away from the mounting shell 1 is fixedly connected to a pull ring 14, which facilitates the side plate 13 and the card block 11 to be stably disassembled and assembled inside the third through-hole 2 for use through the pull ring 14.

[0021] Specifically, the lower end of the second through-hole 4 is fixedly connected with a corresponding soft cover 33 , which is conducive to opening and closing the second through-hole 4 through the soft cover 33 , and is convenient for replacing the chip in and out.

[0022] Specifically, the top of the mounting shell 1 is fixedly connected to a limit block 34, and the limit block 34 and the slot 25 are arranged at corresponding heights, which is conducive to positioning the mounting frame 15 through the limit block 34 and facilitating positioning and connecting the chip when rising.

[0023] Specifically, an arc ring 35 is fixedly connected to one side of the upper end of the mounting shell 1, and the arc ring 35 fits the human ear, which is conducive to facilitating the mounting shell 1 and the first earphone 23 to be stably carried on the ear through the arc ring 35.

[0024] During use, when it is necessary to replace the vibrator inside the slot 25 in the chip connector 24, first take out the soft cover 33 from the second through-hole 4, then pull the pull ring 14, the pull ring 14 is forced to pull the side plate 13, the side plate 13 takes the block 11 out of the third through-hole 2, at this time, the push wheel 8 is pushed through the third through-hole 2, the push wheel 8 is forced to drive the first screw 7 to rotate through the bearing, when the first screw 7 rotates, the first screw sleeve 9 and the mounting bracket 15 are lowered by the sliding limit action of the second slide groove 3 and the first slider 10, and when the mounting bracket 15 is lowered, the second screw sleeve 19 and the support rod 21 are used to stably drive the U The U-shaped plate 221 descends. When the U-shaped plate 221 descends and passes through the second through-hole 4 to move to the outside of the mounting shell 1, the chip to be replaced is placed in the middle of the clamping plate 224, and then the electric telescopic rod 223 is started by an external power supply. The electric telescopic rod 223 pushes the clamping plate 224, and the clamping plate 224 is stably moved under the sliding limit of the fourth slide groove 222 and the slide rod 225 to stably clamp the chip in the clamping groove 226. At this time, the third through-hole 2 is reversed, and the first screw rod 7 drives the first screw sleeve 9 to reverse and rise. The first screw sleeve 9 drives the U-shaped plate 221 to rise through the mounting frame 15 and the support rod 21. When the mounting frame 1 5 rises and contacts the bottom end of the limit block 34, the push wheel 8 stops rotating, and the drive motor 17 is started by the external power supply at this time. The output end of the drive motor 17 drives the second screw 18 to rotate through the bearing, and the second screw 18 synchronously drives the second screw sleeve 19 to rotate. The second screw sleeve 19 is forced to move under the sliding limit of the second slider 20 and the third slide groove 16. When the second screw sleeve 19 moves, it synchronously drives the U-shaped plate 221 to move through the support rod 21. When the U-shaped plate 221 drives the chip to move, when the U-shaped plate 221 drives the chip to pass through the first through-hole 6 and insert it into the slot 25 inside the chip connector 24 , then start the electric telescopic rod 223 to loosen the splint 224. At this time, the chip connector 24 conducts bone sound through the chip, and then is clamped on the ear through the arc ring 35, the first earphone 23 is clamped inside the ear, the second earphone 37 is installed outside the ear bone, and then the shielding ring 29 is pulled. The shielding ring 29 moves under the sliding limit action of the first slide groove 5 and the third slider 28. The shielding ring 29 is connected to each other under the magnetic action of the magnetic block 32 to shield and seal the inside of the ear. Closing the inside of the ear can increase the bone conduction sound quality of the first earphone 23, and at the same time, cooperate with the second earphone 37 to further increase the bone conduction sound quality.

[0025] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. A bone conduction speaker for improving the sound quality of a bone conduction speaker, characterized in that: The invention comprises a first earphone (23) with an opening on one side and a hearing aid chip body inside, the first earphone (23) being fixedly connected with a chip connector (24) inside, the chip connector (24) being provided with a slot (25) on a side close to the opening, both ends of the chip connector (24) being fixedly connected with a vibration rod (26), both ends of the vibration rod (26) extending to the outside of the first earphone (23) and both being fixedly connected with a vibration sheet (27), the other side of the first earphone (23) being fixedly connected with a connecting wire (36), the connecting wire (36) being electrically connected to the chip connector (24), and the lower end of the connecting wire (36) being fixedly connected with a The second earphone (37), the first earphone (23) is fixedly connected to a mounting shell (1) on one side close to the opening, the mounting shell (1) is provided with a first through-opening (6) through one side close to the first earphone (23), the outer wall of the mounting shell (1) at both ends of the first through-opening (6) is provided with first sliding grooves (5) symmetrically arranged, the bottom end of the mounting shell (1) is provided with a second through-opening (4), the inner wall of the mounting shell (1) on one side away from the first earphone (23) is provided with a second sliding groove (3), and the side wall of the mounting shell (1) located at the upper end of the second sliding groove (3) is provided with a third through-opening (2), the mounting shell (1) is provided with a first through-opening (6) through one side close to the first earphone (23), and the side wall of the mounting shell (1) is provided with a third through-opening (2), the mounting shell (1) is provided with a first through-opening (6) through one side close to the first earphone (23), and the first through-opening (6) through one side close to the first earphone (23) is provided with a second sliding groove (3), and the side wall of the mounting shell (1) located at the upper end of the second sliding groove (3) is provided with a third through-opening (2), the mounting shell (1) is provided with a first through-opening (6) through one side close to the first earphone (23), and the first through-opening (6) through one side close to the first earphone (23) is provided with a first through-opening (5), and the first through-opening (6) through one side close to the first earphone (23) is provided with a first through-opening (4), and the first through-opening (6) through one side close to the first earphone (23) is provided with a second sliding groove (3), and the first through-opening (6) through one side close to the first earphone (23) is provided with a first The inner walls at both ends of one side of the slide groove (3) are rotatably connected to a first screw rod (7) through bearings, a rod wall of the first screw rod (7) near the upper end is fixedly sleeved with a push wheel (8), one side of the push wheel (8) extends into the third through-hole (2), a first screw sleeve (9) is threadedly connected to the rod wall at the lower end of the first screw rod (7), a first slider (10) is fixedly connected to the side of the first screw sleeve (9) near the second slide groove (3), the first slider (10) is slidably connected in the second slide groove (3), a mounting frame (15) is fixedly connected to the side of the first screw sleeve (9) away from the second slide groove (3), and a third slide groove is provided inside the top end of the mounting frame (15). (16), and a driving motor (17) is fixedly connected to the inner wall of one side of the mounting frame (15), and a second screw rod (18) is fixedly connected to the output end of the driving motor (17), and the other side of the second screw rod (18) is rotatably connected to the mounting frame (15) through a bearing, and the second screw rod (18) is threadedly connected to a second screw sleeve (19) at the stem, and a second slider (20) is fixedly connected to the upper end of the second screw sleeve (19), and the upper end of the second slider (20) is slidably connected to the third slide groove (16), and a support rod (21) is fixedly connected to one side of the lower surface of the second screw sleeve (19), and a clamping mechanism (22) is fixedly connected to the lower end of the support rod (21).

2. A bone conduction speaker for improving the sound quality of a bone conduction speaker according to claim 1, characterized in that: The clamping mechanism (22) comprises a U-shaped plate (221), the U-shaped plate (221) being fixedly connected to the lower end of the support rod (21), a fourth sliding groove (222) being provided on the inner wall of one side of the U-shaped plate (221), electric telescopic rods (223) being fixedly connected to both ends of the U-shaped plate (221) in a symmetrical arrangement, the output ends of the electric telescopic rods (223) being fixedly connected to clamping plates (224), a side of the clamping plates (224) close to the fourth sliding groove (222) being fixedly connected to a sliding rod (225), the sliding rod (225) being slidably connected in the fourth sliding groove (222), and a clamping groove (226) being provided on the opposite ends of the clamping plates (224), the clamping grooves (226) jointly clamping the vibration chip.

3. A bone conduction speaker for improving the sound quality of a bone conduction speaker according to claim 1, characterized in that: A third sliding block (28) is slidably connected in the first sliding groove (5), a shielding ring (29) is fixedly connected to the side of the third sliding block (28) away from the mounting shell (1), a sealing groove (30) is provided on the side of the shielding ring (29) away from the mounting shell (1), a mounting groove (31) is provided at one end of the shielding ring (29) close to the first earphone (23), and a magnetic block (32) is fixedly connected in the mounting groove (31).

4. A bone conduction speaker for improving the sound quality of a bone conduction speaker according to claim 1, characterized in that: A clamping block (11) is movably clamped in the third through-hole (2); a through-groove (12) is provided on a side of the clamping block (11) close to the push wheel (8); the through-groove (12) is sleeved on the outside of the push wheel (8); a side of the clamping block (11) away from the mounting shell (1) is fixedly connected to a side plate (13); and a side of the side plate (13) away from the mounting shell (1) is fixedly connected to a pull ring (14).

5. A bone conduction speaker for improving the sound quality of a bone conduction speaker according to claim 1, characterized in that: A corresponding soft cover (33) is fixedly connected to the lower end of the second through-hole (4).

6. A bone conduction speaker for improving the sound quality of a bone conduction speaker according to claim 1, characterized in that: The top end of the mounting shell (1) is fixedly connected to a limiting block (34), and the limiting block (34) and the slot (25) are arranged at corresponding heights.

7. A bone conduction speaker for improving the sound quality of a bone conduction speaker according to claim 1, characterized in that: An arc-shaped ring (35) is fixedly connected to one side of the upper end of the mounting shell (1), and the arc-shaped ring (35) fits closely to the human ear.

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