WO2016091066A1 - Voice coil and speaker - Google Patents

Voice coil and speaker Download PDF

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Publication number
WO2016091066A1
WO2016091066A1 PCT/CN2015/095497 CN2015095497W WO2016091066A1 WO 2016091066 A1 WO2016091066 A1 WO 2016091066A1 CN 2015095497 W CN2015095497 W CN 2015095497W WO 2016091066 A1 WO2016091066 A1 WO 2016091066A1
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WO
WIPO (PCT)
Prior art keywords
voice coil
winding
winding layer
winding part
layer
Prior art date
Application number
PCT/CN2015/095497
Other languages
French (fr)
Inventor
Jing Shi
Guimin WU
Bing Wang
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Knowles Ipc (M) Sdn. Bhd.
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Publication date
Application filed by Knowles Ipc (M) Sdn. Bhd. filed Critical Knowles Ipc (M) Sdn. Bhd.
Publication of WO2016091066A1 publication Critical patent/WO2016091066A1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/02—Details
    • H04R9/04—Construction, mounting, or centering of coil
    • H04R9/046—Construction
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/06—Loudspeakers

Definitions

  • the present invention relates to a coil, more particularly, relates to a voice coil and a speaker comprising the voice coil.
  • a speaker is an apparatus for outputting a voice.
  • the speaker comprises a voice coil, a vibration membrane (or referred as paper basin) disposed above the top of the voice coil, and a magnet disposed near the bottom of the voice coil.
  • the voice coil vibrates under an action of a magnetic field of the magnet and drives the vibration membrane to vibrate with it, and then the vibration membrane resonates with surrounding air to output a voice.
  • Fig. 2 is an illustrative axial cross section view of a 3.5 layer voice coil 10 of a speaker in prior art.
  • the voice coil 10 comprises a first winding layer 1 as an innermost winding layer, a second winding layer 2 wound on the first winding layer 1, a third winding layer 3 wound on the second winding layer 2, and an outermost winding layer 4 wound on the third winding layer 3.
  • the first, second and third winding layers 1, 2 and 3 all extend the entire height of the voice coil 10, but the outermost winding layer 4 only extends from the bottom to a middle position of the voice coil 10. That is, the first, second and third winding layers 1, 2 and 3 have a height equal to a total height H of the voice coil 10, but the outermost winding layer 4 has a height equal to about half of the total height H of the voice coil 10. For this reason, such voice coil 10 is referred as 3.5 layer coil in the prior art.
  • an end of the innermost winding layer 1 functions as an input termination 11 of the voice coil 10
  • an end of the outermost winding layer 4 functions as an output termination 12.
  • the input termination 11 and the output termination 12 are configured to connect an external circuit, so as to form a closed loop.
  • Fig. 1 is an illustrative front view of a 3.5 layer voice coil 10 of a speaker in prior art, in which a magnet is shown.
  • Fig. 3 is an illustrative view of the outermost winding layer 4 of the voice coil 10 of Fig. 1.
  • the outermost winding layer 4 is wound from the bottom to only about half height position of the 3.5 layer voice coil 10. Thereby, the end (the output termination 12) of the outermost winding layer 4 extends upward from the half height position of the 3.5 layer voice coil 10. Consequently, as clearly shown in Fig. 1, a lower portion 12a of the output termination 12 of the outermost winding layer 4 is very close to the magnet 20 disposed near the bottom of the voice coil 10. Thereby, when voice coil 10 vibrates up and down, the lower portion 12a of the output termination 12 of the outermost winding layer 4 likely contacts or hits the magnet 20, and it may interfere the vibration of the voice coil 10 and produce a noise, disadvantageously affecting the sound quality and reliability of the speaker.
  • the present invention has been made to overcome or alleviate at least one aspect of the above mentioned disadvantages.
  • a voice coil capable of improving sound quality and reliability of a speaker.
  • the present invention may be implemented by the following embodiments.
  • a voice coil wound by a wire having a predetermined length is composed of a plurality of layers of coils, the innermost winding layer of which has an end as an input termination of the voice coil, the outermost winding layer of which has an end as an output termination of the voice coil.
  • the voice coil defines a top and a bottom, and the input termination is introduced in from the top of the voice coil.
  • the outermost winding layer is wound from the bottom to the top of the voice coil, so that the output termination is introduced out from the top of the voice coil.
  • the outer most winding layer comprises a first winding part with a first pitch and a second winding part with a second pitch in a height direction of the voice coil, and the first pitch is less than the second pitch.
  • the first winding part of the outermost winding layer has a height within a range of 0.1 ⁇ 0.9 times of a total height of the voice coil.
  • the height of the first winding part of the outermost winding layer is substantially equal to 0.5 times of the total height of the voice coil.
  • the voice coil includes a first winding layer as the innermost winding layer, a second winding layer wound on the first winding layer, a third winding layer wound on the second winding layer, and the outermost winding layer.
  • the first winding part is arranged near the bottom of the voice coil, and the second winding part is arranged near the top of the voice coil.
  • the first winding part is arranged near the top of the voice coil, and the second winding part is arranged near the bottom of the voice coil.
  • the first winding part is arranged in a middle region of the voice coil in the height direction; and the second winding part comprises two second sub-winding part arranged near the top and the bottom of the voice coil, respectively.
  • the second pitch of the second winding part is larger than 2 times of the first pitch of the first winding part.
  • the wire is coated with an adhesive, and adjacent winding layers of the voice coil are bonded with each other by means of the adhesive.
  • a speaker comprising: a magnet configured to generate a magnetic field; the voice coil, according to any one of above embodiments, provided in the magnetic field; and a vibration membrane fixed to the voice coil.
  • the input termination and the output termination of the voice coil are configured to connect an external circuit, and the magnet is disposed near the bottom of the voice coil and far away from the top of the voice coil.
  • the vibration membrane is disposed above the top of the voice coil.
  • the output termination of the voice coil since the input termination and the output termination of the voice coil are introduced in and out from the top of the voice coil, the output termination of the voice coil unlikely contacts or hits the magnet disposed near the bottom of the voice coil during the voice coil vibrates up and down. Thereby, it can effectively prevent a noise from being occurred in the voice output from the speaker, improving the sound quality and reliability of the speaker.
  • Fig. 1 is an illustrative front view of a 3.5 layer voice coil of a speaker in prior art
  • Fig. 2 is an illustrative axial cross section view of a 3.5 layer voice coil of a speaker in prior art
  • Fig. 3 is an illustrative view of an outermost winding layer of the voice coil of Figs. 1-2;
  • Fig. 4 is an illustrative front view of a voice coil according to a first exemplary embodiment of the present invention
  • Fig. 5 is an illustrative axial cross section view of a voice coil according to a first exemplary embodiment of the present invention
  • Fig. 6 is an illustrative view of an outermost winding layer of the voice coil of Figs. 4-5;
  • Fig. 7 is an illustrative front view of an outermost winding layer of a voice coil according to a second exemplary embodiment of the present invention.
  • Fig. 8 is an illustrative front view of an outermost winding layer of a voice coil according to a third exemplary embodiment of the present invention.
  • a voice coil wound by a wire having a predetermined length is composed of a plurality of layers of coils, the innermost winding layer of which has an end as an input termination of the voice coil, the outermost winding layer of which has an end as an output termination of the voice coil.
  • the voice coil defines a top and a bottom, and the input termination is introduced in from the top of the voice coil.
  • the outermost winding layer is wound from the bottom to the top of the voice coil, so that the output termination is introduced out from the top of the voice coil.
  • the outer most winding layer comprises a first winding part with a first pitch and a second winding part with a second pitch in a height direction of the voice coil, and the first pitch is less than the second pitch.
  • a speaker comprising the above voice coil.
  • Fig. 5 is an illustrative axial cross section view of a voice coil 100 according to a first exemplary embodiment of the present invention.
  • a voice coil 100 for a speaker may be wound by a wire having a predetermined length.
  • the voice coil 100 is composed of a plurality of winding layers101, 102, 103, 104.
  • the includes a first winding layer 101 as an innermost winding layer, a second winding layer 102 wound on the first winding layer 101, a third winding layer 103 wound on the second winding layer 103, and an outermost winding layer 104.
  • an end of the innermost winding layer 101 functions as an input termination 110 of the voice coil 100
  • an end of the outermost winding layer 104 functions as an output termination 120 of the voice coil 100.
  • the input termination 110 and the output termination 120 are configured to connect an external circuit, so as to form a closed loop. In this way, a sound signal current may flow through the voice coil 100 via the input termination 110 and the output termination 120.
  • the voice coil 100 has a top and a bottom, and the input termination 110 is introduced in from the top of the voice coil 100.
  • Fig. 4 is an illustrative front view of the voice coil 100 according to the first exemplary embodiment of the present invention
  • Fig. 6 is an illustrative view of the outermost winding layer 104 of the voice coil 100 of Figs. 4-5.
  • the outermost winding layer 104 is wound from the bottom to the top of the voice coil 100, so that the output termination 120 is introduced out from the top of the voice coil 100.
  • the outer most winding layer 104 comprises a first winding part (or referred as a densely winding part) A with a first pitch and a second winding part (or referred as a loosely winding part) B with a second pitch in a height direction of the voice coil 100, and the first pitch is less than the second pitch.
  • the output termination 120 of the voice coil 100 unlikely contacts or hits the magnet 20 disposed near the bottom of the voice coil 100 during the voice coil 100 vibrates up and down. Thereby, it can effectively prevent a noise from being occurred in the voice output from the speaker, improving the sound quality and reliability of the speaker.
  • the first winding layer 101, the second winding layer 102, the third winding layer 103 are all densely wound in the total height H of the voice coil 100 with a pitch equal to the first pitch of the first winding part A of the outermost winding layer 104.
  • the outermost winding layer 104 comprises the densely winding part A and the loosely winding part B, the height of the densely winding part A is less than the total height H of the voice coil 100.
  • the densely winding part A of the outermost winding layer 104 may have a height within a range of 0.1 ⁇ 0.9 times of the total height H of the voice coil 100.
  • the second pitch of the loosely winding part B may be larger than 2 times of the first pitch of the densely winding part A.
  • the second pitch of the loosely winding part B may be equal to 3, 4, 5 or more times of the first pitch of the densely winding part A.
  • the height of the densely winding part A is substantially equal to 0.5 times of the total height H of the voice coil 100. Therefore, the voice coil 100 shown in Figs. 4-6 may be referred as the 3.5 layer voice coil. But the present invention is not limited to the embodiments shown in Figs. 4-6, the densely winding part A of the outermost winding layer 104 may have a height larger than 0 and less than the total height H of the voice coil 100. In this way, in a case where the voice coil 100 is wound by the wire having the predetermined length, the total height H of the entire voice coil 100 can be changed by adjusting the height of the densely winding part A of the outermost winding layer 104. For example, the total height H of the entire voice coil 100 can be increased by reducing the height of the densely winding part A of the outermost winding layer 104. Thereby, various voice coils with different total heights may be produced by using the predetermined length of wire.
  • the first winding part A is arranged near the bottom of the voice coil 100, and the second winding part B is arranged near the top of the voice coil 100.
  • the wire may be coated with an adhesive, and adjacent winding layers 101, 102, 103, 104 of the voice coil 100 are bonded with each other by means of the adhesive. In this way, it can simplify the manufacture of the voice coil 100.
  • Fig. 7 is an illustrative front view of an outermost winding layer 204 of a voice coil 200 according to a second exemplary embodiment of the present invention.
  • the voice coil 200 of the second embodiment shown in Fig. 7 is different only in that the outermost winding layer 204 is wound in a different manner.
  • the first winding part A is arranged near the top of the voice coil 100, and the second winding part B is arranged near the bottom of the voice coil 100. Except for this, the voice coil 200 of the second embodiment shown in Fig. 7 is substantially same as the voice coil 100 of the first embodiment shown in Figs. 4-6. On the purpose of concise, the descriptions about them herein are omitted.
  • the output termination 120 of the voice coil 200 unlikely contacts or hits the magnet 20 (see Fig. 4) disposed near the bottom of the voice coil 200 during the voice coil 200 vibrates up and down. Thereby, it can effectively prevent a noise from being occurred in the voice output from the speaker, improving the sound quality and reliability of the speaker.
  • Fig. 8 is an illustrative front view of an outermost winding layer 304 of a voice coil 300 according to a third exemplary embodiment of the present invention.
  • the voice coil 300 of the third embodiment shown in Fig. 8 is different only in that the outermost winding layer 304 is wound in a different manner.
  • the first winding part A is arranged in a middle region of the voice coil 300 in the height direction
  • the second winding part B comprises two second sub-winding part B1, B2 arranged near the top and the bottom of the voice coil 300, respectively.
  • the voice coil 300 of the third embodiment shown in Fig. 8 is substantially same as the voice coil 100 of the first embodiment shown in Figs. 4-6. On the purpose of concise, the descriptions about them herein are omitted.
  • the output termination 320 of the voice coil 300 unlikely contacts or hits the magnet 20 (see Fig. 4) disposed near the bottom of the voice coil 300 during the voice coil 300 vibrates up and down. Thereby, it can effectively prevent a noise from being occurred in the voice output from the speaker, improving the sound quality and reliability of the speaker.
  • a speaker mainly comprises a case (not shown) , a magnet 20 (see Fig. 4) , a vibration membrane (not shown) and a voice coil 100, 200, 300 according to any one of above embodiments.
  • the magnet 20, the vibration membrane and the voice coil 100, 200, 300 are mounted in the case.
  • the input termination 110 and the output termination 120 of the voice coil 100 are configured to connect an external circuit (not shown) , so as to form a closed loop.
  • an external circuit not shown
  • the voice coil 100 vibrates under an action of a magnetic field of the magnet 20 and drives the vibration membrane to vibrate with it, so that the vibration membrane resonates with surrounding air to output a voice.
  • the magnet 20 is disposed near the bottom of the voice coil 100 and far away from the top of the voice coil 100.
  • the vibration membrane is disposed above the top of the voice coil 100.
  • the output termination 120 of the voice coil 100 unlikely contacts or hits the magnet 20 disposed near the bottom of the voice coil 100 during the voice coil 100 vibrates up and down. Thereby, it can effectively prevent a noise from being occurred in the voice output from the speaker, improving the sound quality and reliability of the speaker.
  • the voice coil 100 of the speaker is a 3.5 layer voice coil, that is, the voice coil 100 comprises four winding layers 101, 102, 103, 104 from the inside toward the outside, and the densely winding part A of the outermost winding layer 104 has a height substantially equal to 0.5 times of the total height H of the entire voice coil 100.
  • the 3.5 layer voice coil according to embodiments of the present invention has a height much larger than that of the traditional 4 layer voice coil.
  • the 3.5 layer voice coil according to embodiments of the present invention can greatly improve various performances of the voice coil without increasing the weight and the resistance.
  • the natural frequency of the 3.5 layer voice coil can be increased by about 10HZ than the traditional 4 layer voice coil, and the sensitivity of 3.5 layer voice coil can be increased by about 0.2dB than the traditional 4 layer voice coil.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)

Abstract

The present invention discloses a voice coil wound by a wire having a predetermined length. The voice coil is composed of a plurality of layers of coils, the innermost winding layer of which has an end as an input termination of the voice coil, the outermost winding layer of which has an end as an output termination of the voice coil. The voice coil defines a top and a bottom, and the input termination is introduced in from the top of the voice coil. The outermost winding layer is wound from the bottom to the top of the voice coil, so that the output termination is introduced out from the top of the voice coil. The outer most winding layer comprises a first winding part with a first pitch and a second winding part with a second pitch in a height direction of the voice coil, and the first pitch is less than the second pitch. In addition, the present invention also discloses a speaker comprising the voice coil.

Description

VOICE COIL AND SPEAKER TECHNICAL FIELD
The present invention relates to a coil， more particularly， relates to a voice coil and a speaker comprising the voice coil.
BACKGROUND
A speaker is an apparatus for outputting a voice. Generally， the speaker comprises a voice coil， a vibration membrane (or referred as paper basin) disposed above the top of the voice coil， and a magnet disposed near the bottom of the voice coil. Upon sound signal current flows through the voice coil via an input termination and an output termination of the voice coil， the voice coil vibrates under an action of a magnetic field of the magnet and drives the vibration membrane to vibrate with it， and then the vibration membrane resonates with surrounding air to output a voice.
Fig. 2 is an illustrative axial cross section view of a 3.5 layer voice coil 10 of a speaker in prior art.
As shown in Fig. 2， in the prior art， the voice coil 10 comprises a first winding layer 1 as an innermost winding layer， a second winding layer 2 wound on the first winding layer 1， a third winding layer 3 wound on the second winding layer 2， and an outermost winding layer 4 wound on the third winding layer 3.
Referring to Fig. 2， the first， second and third  winding layers  1， 2 and 3 all extend the entire height of the voice coil 10， but the outermost winding layer 4 only extends from the bottom to a middle position of the voice coil 10. That is， the first， second and third  winding layers  1， 2 and 3 have a height equal to a total height H of the voice coil 10， but the outermost winding layer 4 has a height equal to about half of the total height H of the voice coil 10. For this reason， such voice coil 10 is referred as 3.5 layer coil in the prior art. As shown in Fig. 2， an end of the innermost winding layer 1 functions as an input termination 11 of the voice coil 10， and an end of the outermost winding layer 4 functions as an output termination 12. The input termination 11 and the output termination 12 are configured to connect an external circuit， so as to form a closed loop.
Fig. 1 is an illustrative front view of a 3.5 layer voice coil 10 of a speaker in prior art， in which a magnet is shown. Fig. 3 is an illustrative view of the outermost winding layer 4 of the voice coil 10 of Fig. 1.
As shown in Figs. 1-3， in the prior art， the outermost winding layer 4 is wound from the bottom to only about half height position of the 3.5 layer voice coil 10. Thereby， the end (the output termination 12) of the outermost winding layer 4 extends upward from the half height position of the 3.5 layer voice coil 10. Consequently， as clearly shown in Fig. 1， a lower portion 12a of the output termination 12 of the outermost winding layer 4 is very close to the magnet 20 disposed near the bottom of the voice coil 10. Thereby， when voice coil 10 vibrates up and down， the lower portion 12a of the output termination 12 of the outermost winding layer 4 likely contacts or hits the magnet 20， and it may interfere the vibration of the voice coil 10 and produce a noise， disadvantageously affecting the sound quality and reliability of the speaker.
SUMMARY
The present invention has been made to overcome or alleviate at least one aspect of the above mentioned disadvantages.
According to an object of the present invention， there is provided a voice coil capable of improving sound quality and reliability of a speaker.
The present invention may be implemented by the following embodiments.
According to an aspect of the present invention， there is provided a voice coil wound by a wire having a predetermined length. The voice coil is composed of a plurality of layers of coils， the innermost winding layer of which has an end as an input termination of the voice coil， the outermost winding layer of which has an end as an output termination of the voice coil. The voice coil defines a top and a bottom， and the input termination is introduced in from the top of the voice coil. The outermost winding layer is wound from the bottom to the top of the voice coil， so that the output termination is introduced out from the top of the voice coil. The outer most winding layer comprises a first winding part with a first pitch and a second winding part with a second pitch in a height direction of the voice coil， and the first pitch is less than the second pitch.
According to an exemplary embodiment of the present invention， the first winding part of the outermost winding layer has a height within a range of 0.1～0.9 times of a total height of the voice coil.
According to another exemplary embodiment of the present invention， the height of the first winding part of the outermost winding layer is substantially equal to 0.5 times of the total height of the voice coil.
According to another exemplary embodiment of the present invention， the voice coil includes a first winding layer as the innermost winding layer， a second winding layer wound on the first winding layer， a third winding layer wound on the second winding layer， and the outermost winding layer.
According to another exemplary embodiment of the present invention， the first winding part is arranged near the bottom of the voice coil， and the second winding part is arranged near the top of the voice coil.
According to another exemplary embodiment of the present invention， the first winding part is arranged near the top of the voice coil， and the second winding part is arranged near the bottom of the voice coil.
According to another exemplary embodiment of the present invention， the first winding part is arranged in a middle region of the voice coil in the height direction； and the second winding part comprises two second sub-winding part arranged near the top and the bottom of the voice coil， respectively.
According to another exemplary embodiment of the present invention， the second pitch of the second winding part is larger than 2 times of the first pitch of the first winding part.
According to another exemplary embodiment of the present invention， the wire is coated with an adhesive， and adjacent winding layers of the voice coil are bonded with each other by means of the adhesive.
According to an aspect of the present invention， there is provided a speaker， comprising： a magnet configured to generate a magnetic field； the voice coil， according to any one of above embodiments， provided in the magnetic field； and a vibration membrane fixed to the voice coil. The input termination and the output termination of the voice coil are configured to connect an external circuit， and the magnet is disposed near the bottom of the voice coil and far away from the top of the voice coil.
According to another exemplary embodiment of the present invention， the vibration membrane is disposed above the top of the voice coil.
In the above exemplary embodiments， since the input termination and the output termination of the voice coil are introduced in and out from the top of the voice coil， the output termination of the voice coil unlikely contacts or hits the magnet disposed near the bottom of the voice coil during the voice coil vibrates up and down. Thereby， it can effectively prevent a noise from being occurred in the voice output from the speaker， improving the sound quality and reliability of the speaker.
BRIEF DESCRIPTION OF THE DRAWINGS
The above and other features of the present invention will become more apparent by describing in detail exemplary embodiments thereof with reference to the accompanying drawings， in which：
Fig. 1 is an illustrative front view of a 3.5 layer voice coil of a speaker in prior art；
Fig. 2 is an illustrative axial cross section view of a 3.5 layer voice coil of a speaker in prior art；
Fig. 3 is an illustrative view of an outermost winding layer of the voice coil of Figs. 1-2；
Fig. 4 is an illustrative front view of a voice coil according to a first exemplary embodiment of the present invention；
Fig. 5 is an illustrative axial cross section view of a voice coil according to a first exemplary embodiment of the present invention；
Fig. 6 is an illustrative view of an outermost winding layer of the voice coil of Figs. 4-5；
Fig. 7 is an illustrative front view of an outermost winding layer of a voice coil according to a second exemplary embodiment of the present invention； and
Fig. 8 is an illustrative front view of an outermost winding layer of a voice coil according to a third exemplary embodiment of the present invention.
DETAILED DESCRIPTION
Exemplary embodiments of the present disclosure will be described hereinafter in detail with reference to the attached drawings， wherein the like reference numerals refer to the like elements. The present disclosure may， however， be embodied in many different forms and should not be construed as being limited to the embodiment set forth herein； rather， these embodiments are provided so that the  present disclosure will be thorough and complete， and will fully convey the concept of the disclosure to those skilled in the art.
In the following detailed description， for purposes of explanation， numerous specific details are set forth in order to provide a thorough understanding of the disclosed embodiments. It will be apparent， however， that one or more embodiments may be practiced without these specific details. In other instances， well-known structures and devices are schematically shown in order to simplify the drawing.
According to a general concept of the present invention， there is provided a voice coil wound by a wire having a predetermined length. The voice coil is composed of a plurality of layers of coils， the innermost winding layer of which has an end as an input termination of the voice coil， the outermost winding layer of which has an end as an output termination of the voice coil. The voice coil defines a top and a bottom， and the input termination is introduced in from the top of the voice coil. The outermost winding layer is wound from the bottom to the top of the voice coil， so that the output termination is introduced out from the top of the voice coil. The outer most winding layer comprises a first winding part with a first pitch and a second winding part with a second pitch in a height direction of the voice coil， and the first pitch is less than the second pitch.
According to another general concept of the present invention， there is provided a speaker comprising the above voice coil.
First Embodiment of Voice Coil
Fig. 5 is an illustrative axial cross section view of a voice coil 100 according to a first exemplary embodiment of the present invention.
According to an embodiment， as shown in Fig. 5， there is disclosed a voice coil 100 for a speaker. The voice coil 100 may be wound by a wire having a predetermined length.
As clearly shown in Fig. 5， the voice coil 100 is composed of a plurality of winding layers101， 102， 103， 104. In the illustrated embodiment， the includes a first winding layer 101 as an innermost winding layer， a second winding layer 102 wound on the first winding layer 101， a third winding layer 103 wound on the second winding layer 103， and an outermost winding layer 104.
According to an exemplary embodiment of the present invention， as shown in Fig. 5， an end of the innermost winding layer 101 functions as an input termination 110 of the voice coil 100， and an end of the outermost winding layer 104 functions  as an output termination 120 of the voice coil 100. The input termination 110 and the output termination 120 are configured to connect an external circuit， so as to form a closed loop. In this way， a sound signal current may flow through the voice coil 100 via the input termination 110 and the output termination 120.
Referring to Fig. 5， the voice coil 100 has a top and a bottom， and the input termination 110 is introduced in from the top of the voice coil 100.
Fig. 4 is an illustrative front view of the voice coil 100 according to the first exemplary embodiment of the present invention， and Fig. 6 is an illustrative view of the outermost winding layer 104 of the voice coil 100 of Figs. 4-5.
In an exemplary embodiment， as shown in Figs. 4-6， the outermost winding layer 104 is wound from the bottom to the top of the voice coil 100， so that the output termination 120 is introduced out from the top of the voice coil 100.
As clearly shown in Fig. 6， the outer most winding layer 104 comprises a first winding part (or referred as a densely winding part) A with a first pitch and a second winding part (or referred as a loosely winding part) B with a second pitch in a height direction of the voice coil 100， and the first pitch is less than the second pitch.
Consequently， as shown in Fig. 4， since the input termination 110 and the output termination 120 of the voice coil 100 are introduced in and out from the top of the voice coil 100 far away from a magnet 20， the output termination 120 of the voice coil 100 unlikely contacts or hits the magnet 20 disposed near the bottom of the voice coil 100 during the voice coil 100 vibrates up and down. Thereby， it can effectively prevent a noise from being occurred in the voice output from the speaker， improving the sound quality and reliability of the speaker.
In an exemplary embodiment， as shown in Figs. 4-6， the first winding layer 101， the second winding layer 102， the third winding layer 103 are all densely wound in the total height H of the voice coil 100 with a pitch equal to the first pitch of the first winding part A of the outermost winding layer 104.
As shown in Figs. 4-6， since the outermost winding layer 104 comprises the densely winding part A and the loosely winding part B， the height of the densely winding part A is less than the total height H of the voice coil 100. In an embodiment， the densely winding part A of the outermost winding layer 104 may have a height within a range of 0.1～0.9 times of the total height H of the voice coil 100.
In an exemplary embodiment， the second pitch of the loosely winding part B may be larger than 2 times of the first pitch of the densely winding part A. For example，  the second pitch of the loosely winding part B may be equal to 3， 4， 5 or more times of the first pitch of the densely winding part A.
In the illustrated embodiment of Figs. 4-6， the height of the densely winding part A is substantially equal to 0.5 times of the total height H of the voice coil 100. Therefore， the voice coil 100 shown in Figs. 4-6 may be referred as the 3.5 layer voice coil. But the present invention is not limited to the embodiments shown in Figs. 4-6， the densely winding part A of the outermost winding layer 104 may have a height larger than 0 and less than the total height H of the voice coil 100. In this way， in a case where the voice coil 100 is wound by the wire having the predetermined length， the total height H of the entire voice coil 100 can be changed by adjusting the height of the densely winding part A of the outermost winding layer 104. For example， the total height H of the entire voice coil 100 can be increased by reducing the height of the densely winding part A of the outermost winding layer 104. Thereby， various voice coils with different total heights may be produced by using the predetermined length of wire.
In an exemplary embodiment， as shown in Figs. 4-6， the first winding part A is arranged near the bottom of the voice coil 100， and the second winding part B is arranged near the top of the voice coil 100.
In an exemplary embodiment， the wire may be coated with an adhesive， and adjacent winding  layers  101， 102， 103， 104 of the voice coil 100 are bonded with each other by means of the adhesive. In this way， it can simplify the manufacture of the voice coil 100.
Second Embodiment of Voice Coil
Fig. 7 is an illustrative front view of an outermost winding layer 204 of a voice coil 200 according to a second exemplary embodiment of the present invention.
Compared with the voice coil 100 of the first embodiment shown in Figs. 4-6， the voice coil 200 of the second embodiment shown in Fig. 7 is different only in that the outermost winding layer 204 is wound in a different manner.
As shown in Fig. 7， the first winding part A is arranged near the top of the voice coil 100， and the second winding part B is arranged near the bottom of the voice coil 100. Except for this， the voice coil 200 of the second embodiment shown in Fig. 7 is substantially same as the voice coil 100 of the first embodiment shown in Figs. 4-6. On the purpose of concise， the descriptions about them herein are omitted.
As shown in Fig. 7， in the second embodiment， since the input termination 210 and the output termination 220 of the voice coil 200 are introduced in and out from the  top of the voice coil 200 far away from a magnet 20， the output termination 120 of the voice coil 200 unlikely contacts or hits the magnet 20 (see Fig. 4) disposed near the bottom of the voice coil 200 during the voice coil 200 vibrates up and down. Thereby， it can effectively prevent a noise from being occurred in the voice output from the speaker， improving the sound quality and reliability of the speaker.
Third Embodiment of Voice Coil
Fig. 8 is an illustrative front view of an outermost winding layer 304 of a voice coil 300 according to a third exemplary embodiment of the present invention.
Compared with the voice coil 100 of the first embodiment shown in Figs. 4-6， the voice coil 300 of the third embodiment shown in Fig. 8 is different only in that the outermost winding layer 304 is wound in a different manner.
As shown in Fig. 8， the first winding part A is arranged in a middle region of the voice coil 300 in the height direction， and the second winding part B comprises two second sub-winding part B1， B2 arranged near the top and the bottom of the voice coil 300， respectively. Except for this， the voice coil 300 of the third embodiment shown in Fig. 8 is substantially same as the voice coil 100 of the first embodiment shown in Figs. 4-6. On the purpose of concise， the descriptions about them herein are omitted.
As shown in Fig. 8， in the third embodiment， since the input termination 310 and the output termination 320 of the voice coil 300 are introduced in and out from the top of the voice coil 300 far away from a magnet 20， the output termination 320 of the voice coil 300 unlikely contacts or hits the magnet 20 (see Fig. 4) disposed near the bottom of the voice coil 300 during the voice coil 300 vibrates up and down. Thereby， it can effectively prevent a noise from being occurred in the voice output from the speaker， improving the sound quality and reliability of the speaker.
Embodiment of Speaker
In an exemplary embodiment of the present invention， there is disclosed a speaker. The speaker mainly comprises a case (not shown) ， a magnet 20 (see Fig. 4) ， a vibration membrane (not shown) and a  voice coil  100， 200， 300 according to any one of above embodiments. The magnet 20， the vibration membrane and the  voice coil  100， 200， 300 are mounted in the case.
In an exemplary embodiment， for example， as shown in Figs. 4-6， the input termination 110 and the output termination 120 of the voice coil 100 are configured to connect an external circuit (not shown) ， so as to form a closed loop. In this way， when a sound signal current flows through the voice coil 100 via the input  termination 110 and the output termination 120， the voice coil 100 vibrates under an action of a magnetic field of the magnet 20 and drives the vibration membrane to vibrate with it， so that the vibration membrane resonates with surrounding air to output a voice.
In an exemplary embodiment， referring to Figs. 4-6 again， the magnet 20 is disposed near the bottom of the voice coil 100 and far away from the top of the voice coil 100. The vibration membrane is disposed above the top of the voice coil 100. In the illustrated embodiment， since the input termination 110 and the output termination 120 of the voice coil 100 are introduced in and out from the top of the voice coil 100 far away from a magnet 20， the output termination 120 of the voice coil 100 unlikely contacts or hits the magnet 20 disposed near the bottom of the voice coil 100 during the voice coil 100 vibrates up and down. Thereby， it can effectively prevent a noise from being occurred in the voice output from the speaker， improving the sound quality and reliability of the speaker.
In an exemplary embodiment， the voice coil 100 of the speaker is a 3.5 layer voice coil， that is， the voice coil 100 comprises four winding  layers  101， 102， 103， 104 from the inside toward the outside， and the densely winding part A of the outermost winding layer 104 has a height substantially equal to 0.5 times of the total height H of the entire voice coil 100.
If the 3.5 layer voice coil according to embodiments of the present invention and a traditional 4 layer voice coil both are wound by the same length of wires， the 3.5 layer voice coil according to embodiments of the present invention has a height much larger than that of the traditional 4 layer voice coil. Thereby， the 3.5 layer voice coil according to embodiments of the present invention can greatly improve various performances of the voice coil without increasing the weight and the resistance. For example， according to tests， the natural frequency of the 3.5 layer voice coil can be increased by about 10HZ than the traditional 4 layer voice coil， and the sensitivity of 3.5 layer voice coil can be increased by about 0.2dB than the traditional 4 layer voice coil.
It should be appreciated for those skilled in this art that the above embodiments are intended to be illustrated， and not restrictive. For example， many modifications may be made to the above embodiments by those skilled in this art， and various features described in different embodiments may be freely combined with each other without conflicting in configuration or principle.
Although several exemplary embodiments have been shown and described， it would be appreciated by those skilled in the art that various changes or  modifications may be made in these embodiments without departing from the principles and spirit of the disclosure， the scope of which is defined in the claims and their equivalents.
As used herein， an element recited in the singular and proceeded with the word ″a″ or ″an″ should be understood as not excluding plural of said elements or steps， unless such exclusion is explicitly stated. Furthermore， references to ″one embodiment″ of the present invention are not intended to be interpreted as excluding the existence of additional embodiments that also incorporate the recited features. Moreover， unless explicitly stated to the contrary， embodiments ″comprising″ or ″having″ an element or a plurality of elements having a particular property may include additional such elements not having that property.

Claims (11)

  1. A voice coil (100) wound by a wire having a predetermined length，
    wherein the voice coil (100) is composed of a plurality of winding layers (101， 102， 103， 104) ， the innermost winding layer (101) of which has an end as an input termination (110) of the voice coil (100) ， the outermost winding layer (104) of which has an end as an output termination (120) of the voice coil (100) ，
    wherein the voice coil (100) defines a top and a bottom， and the input termination (110) is introduced in from the top of the voice coil (100) ，
    characterized in that：
    wherein the outermost winding layer (104) is wound from the bottom to the top of the voice coil (100) ， so that the output termination (120) is introduced out from the top of the voice coil (100) ； and
    wherein the outer most winding layer (104) comprises a first winding part (A) with a first pitch and a second winding part (B) with a second pitch in a height direction of the voice coil (100) ， and the first pitch is less than the second pitch.
  2. The voice coil according to claim 1，
    wherein the first winding part (A) of the outermost winding layer (104) has a height within a range of 0.1～0.9 times of a total height (H) of the voice coil (100) .
  3. The voice coil according to claim 2，
    wherein the height of the first winding part (A) of the outermost winding layer (104) is substantially equal to 0.5 times of the total height (H) of the voice coil (100) .
  4. The voice coil according to claim 3，
    wherein the voice coil (100) includes a first winding layer (101) as the innermost winding layer， a second winding layer (102) wound on the first winding layer (101) ， a third winding layer (103) wound on the second winding layer (103) ， and the outermost winding layer (104) .
  5. The voice coil according to any one of claims 1-4，
    wherein the first winding part (A) is arranged near the bottom of the voice coil (100) ， and the second winding part (B) is arranged near the top of the voice coil (100) .
  6. The voice coil according to any one of claims 1-4，
    wherein the first winding part (A) is arranged near the top of the voice coil (200) ， and the second winding part (B) is arranged near the bottom of the voice coil (200) .
  7. The voice coil according to any one of claims 1-4，
    wherein the first winding part (A) is arranged in a middle region of the voice coil (300) in the height direction； and
    wherein the second winding part (B) comprises two second sub-winding part (B1， B2) arranged near the top and the bottom of the voice coil (300) ， respectively.
  8. The voice coil according to any one of claims 1-4，
    wherein the second pitch of the second winding part (B) is larger than 2 times of the first pitch of the first winding part (A) .
  9. The voice coil according to any one of claims 1-4，
    wherein the wire is coated with an adhesive， and adjacent winding layers of the voice coil (100) are bonded with each other by means of the adhesive.
  10. A speaker， comprising：
    a magnet (20) configured to generate a magnetic field；
    the voice coil (100) ， according to any one of preceding claims 1-9， provided in the magnetic field； and
    a vibration membrane fixed to the voice coil (100) ，
    wherein the input termination (110) and the output termination (120) of the voice coil (100) are configured to connect an external circuit， and
    wherein the magnet (20) is disposed near the bottom of the voice coil (100) and far away from the top of the voice coil (100) .
  11. The speaker according to claim 10， wherein the vibration membrane is disposed above the top of the voice coil (100) .
PCT/CN2015/095497 2014-12-08 2015-11-25 Voice coil and speaker WO2016091066A1 (en)

Applications Claiming Priority (2)

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CN201410742126.6 2014-12-08
CN201410742126.6A CN105744445B (en) 2014-12-08 2014-12-08 Coil and loudspeaker

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WO2016091066A1 true WO2016091066A1 (en) 2016-06-16

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Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN214429708U (en) * 2020-09-22 2021-10-19 瑞声科技(新加坡)有限公司 Sound production device
CN112165677B (en) * 2020-10-29 2022-04-26 瑞声新能源发展(常州)有限公司科教城分公司 Winding method and winding device of double voice coils

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2445538Y (en) * 2000-08-25 2001-08-29 詹晏祯 Improved structure of loudspeaker voice coil
US6292079B1 (en) * 2000-09-08 2001-09-18 Yen-Chen Chan Coil assembly of speaker
JP2005184589A (en) * 2003-12-22 2005-07-07 Matsushita Electric Ind Co Ltd Voice coil for electroacoustic transducer, electroacoustic transducer employing the voice coil, and electronic device and apparatus employing electroacoustic transducer
CN102523545A (en) * 2011-12-27 2012-06-27 楼氏电子（北京）有限公司 Voice coil and formation method and application thereof
CN202435596U (en) * 2011-12-27 2012-09-12 楼氏电子（北京）有限公司 Voice coil
CN202799122U (en) * 2012-08-22 2013-03-13 歌尔声学股份有限公司 Loudspeaker device
CN204244469U (en) * 2014-12-08 2015-04-01 楼氏电子（北京）有限公司 Coil and loud speaker

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2445538Y (en) * 2000-08-25 2001-08-29 詹晏祯 Improved structure of loudspeaker voice coil
US6292079B1 (en) * 2000-09-08 2001-09-18 Yen-Chen Chan Coil assembly of speaker
JP2005184589A (en) * 2003-12-22 2005-07-07 Matsushita Electric Ind Co Ltd Voice coil for electroacoustic transducer, electroacoustic transducer employing the voice coil, and electronic device and apparatus employing electroacoustic transducer
CN102523545A (en) * 2011-12-27 2012-06-27 楼氏电子（北京）有限公司 Voice coil and formation method and application thereof
CN202435596U (en) * 2011-12-27 2012-09-12 楼氏电子（北京）有限公司 Voice coil
CN202799122U (en) * 2012-08-22 2013-03-13 歌尔声学股份有限公司 Loudspeaker device
CN204244469U (en) * 2014-12-08 2015-04-01 楼氏电子（北京）有限公司 Coil and loud speaker

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CN105744445B (en) 2019-07-12

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