Moving coil loudspeaker
By optimizing the volume ratio of the front cavity and the rear cavity in the dynamic coil speaker, and combining the design of the magnetic circuit mechanism and voice coil, the problem of poor sound effects in the medium and high frequency of the existing speakers is solved, and better sound compatibility is achieved.
Patent Information
- Application Number
- CN202421659369.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-12
- Publication Date
- 2025-05-27
- Estimated Expiration
- 2034-07-12
AI Technical Summary
The existing speakers have poor sound effects in the mid-to-high frequency range, which affects the sound quality and is difficult to compatible with a variety of headphones.
A dynamic coil horn is designed, with a volume ratio of the front cavity to the rear cavity of 0.4-0.7. The magnetic circuit mechanism is installed in the rear cavity, the voice coil is connected to the diaphragm, and extends into the magnetic gap to enhance the effect of the magnetic field.
The mid-to-high-frequency sound effect of the speaker is significantly improved within the 1k-20kHz range, and can be more widely compatible with a variety of headphones and improve sound quality.
Smart Images
Figure CN222916188U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of moving coil speakers, and particularly relates to a moving coil speaker. Background Art
[0002] The natural sound wave frequency audible to the human ear is between 20 Hz and 20 kHz; among them, the range of 200 Hz - 700 Hz belongs to low-frequency sounds, and the range of 1 kHz - 20 kHz belongs to medium-high frequency sounds. When using external devices such as headphones to receive audio, the low frequency will affect the strength of the singing voice, and the high frequency will affect the brightness of the timbre. Therefore, the external playback capabilities of these two audio frequencies are considered an important factor in judging the sound quality of external devices.
[0003] In the speaker component, a sound cavity is usually arranged inside the housing, and a diaphragm is arranged in the sound cavity; during use, the voice coil on the diaphragm is energized, and the voice coil reciprocates in the magnetic field, thereby driving the diaphragm to reciprocate and generate sound waves; when the electrical signal changes rapidly, the diaphragm will vibrate at a high speed to generate sound waves, and the sound waves are transmitted outward for the user to hear the audio sound; when the diaphragm vibrates, the diaphragm will reciprocally compress the front cavity and the rear cavity, and the volume ratio of the front cavity and the rear cavity will affect the frequency and amplitude of the diaphragm, thereby affecting the sound quality of the speaker. Therefore, there is an urgent need for a speaker with a louder sound and better sound effect in the medium-high frequency range, which can be widely compatible with more headphones. Summary of the Utility Model
[0004] The purpose of the utility model is to provide a moving coil speaker, aiming to solve one of the technical problems existing in the prior art.
[0005] To achieve the above purpose, a moving coil speaker provided by an embodiment of the utility model includes:
[0006] A housing, in which a receiving cavity is provided;
[0007] A diaphragm, which is arranged in the receiving cavity and its periphery is fixedly connected to the inner wall of the receiving cavity. The diaphragm divides the receiving cavity into a front cavity and a rear cavity, and the volume ratio of the front cavity to the rear cavity is 0.4 - 0.7;
[0008] A magnetic circuit mechanism, which is arranged in the rear cavity, and a magnetic gap is formed between the magnetic circuit mechanism and the housing; and
[0009] A voice coil, which is arranged in the rear cavity. One end of the voice coil is connected to the diaphragm, and the other end of the voice coil extends into the magnetic gap;
[0010] An audio outlet communicating with the front cavity is provided at one end of the housing, and at least one first air hole communicating with the rear cavity is provided at the other end of the housing.
[0011] Optionally, the rear cavity includes a first cavity and a second cavity; the diameter of the first cavity is greater than that of the second cavity, and the periphery of the diaphragm is fixedly connected to the inner wall of the first cavity; the magnetic circuit mechanism is installed in the second cavity.
[0012] Optionally, a second air hole communicating with the first cavity is formed in the outer wall of the housing.
[0013] Optionally, the diameter of the second cavity is 6-7 mm, and the height of the second cavity is 1.7-2.1 mm; the width of the magnetic gap is 0.6-0.7 mm; the height of the voice coil is 1-1.5 mm, and the length of the voice coil extending into the magnetic gap is 0.7-1 mm.
[0014] Optionally, the magnetic circuit mechanism includes a magnet and a washer; the magnet is disposed in the middle of the second cavity, and the washer is disposed at one end of the magnet close to the diaphragm.
[0015] Optionally, air channels are respectively formed through the centers of the magnet and the washer, and both ends of the air channels are respectively communicated with the rear cavity and the first air hole.
[0016] Optionally, the diameter of the magnet is 4.6-5.8 mm, and the height of the magnet is 1.3-1.8 mm; the diameter of the washer is 4.6-5.8 mm, and the height of the washer is 0.3-0.6 mm.
[0017] Optionally, the volume of the front cavity is 30-42 mm 3 and the volume of the rear cavity is 60-75 mm 3 .
[0018] Optionally, the housing includes a U-shaped iron and a cover; the cover is disposed on the opening of the U-shaped iron cavity, and the accommodation cavity is formed between the cover and the U-shaped iron, and the diaphragm is located between the cover and the U-shaped iron; the magnetic gap is formed between the magnetic circuit mechanism and the U-shaped iron.
[0019] Optionally, the first air hole is covered with a filter screen.
[0020] Compared with the prior art, one or more of the above technical solutions in the moving coil loudspeaker provided by the embodiment of the present invention at least have one of the following technical effects:
[0021] Taking the frequency (Hz) as the abscissa and the decibel value (dB) as the ordinate, the acoustic wave curve generated by the vibration of the diaphragm is tested. Curve A is the experimental group, and curve B is the control group. Among them, curve A is the acoustic wave curve with the volume ratio of the front cavity to the rear cavity of 0.55 of the present invention, and curve B is the acoustic wave curve with the volume ratio of the conventional front cavity to the rear cavity in the prior art. It can be seen from the comparison of curve A and curve B that at the same frequency, the decibel of the sound of curve A is greater, especially in the range of 1k - 20kHz, improving the high-frequency sound effect of the speaker and being widely compatible with more earphones. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.
[0023] Figure 1 It is a schematic structural diagram of the moving coil speaker of the present invention.
[0024] Figure 2 It is a sectional view of the moving coil speaker of the present invention.
[0025] Figure 3 It is an acoustic wave curve diagram of the moving coil speaker of the present invention.
[0026] Among them, the reference numerals in the drawings are as follows:
[0027] 100, housing; 110, front cavity; 120, rear cavity; 121, first cavity; 122, second cavity; 130, sound outlet; 140, first air hole; 150, second air hole; 160, U-shaped iron; 161, stepped platform; 170, cover body; 171, extended ring; 172, annular groove; 180, filter net;
[0028] 200, diaphragm; 210, voice coil;
[0029] 300, magnetic circuit mechanism; 310, magnetic gap; 320, magnet; 330, washer; 340, air channel. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0030] The following will describe in detail the embodiments of the present invention. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions from beginning to end. The embodiments described below by referring to the drawings are exemplary and are intended to explain the embodiments of the present invention and should not be construed as limiting the present invention.
[0031] In the description of the embodiments of the present utility model, it should be understood that the orientation or positional relationships indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings. These are only for the convenience of describing the embodiments of the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation on the present utility model.
[0032] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the embodiments of the present utility model, the meaning of "a plurality" is two or more, unless otherwise specifically defined.
[0033] In the embodiments of the present utility model, unless otherwise clearly specified and limited, the terms "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present utility model can be understood according to specific circumstances.
[0034] In one embodiment of the present utility model, referring to Figures 1 - 3 , a moving coil loudspeaker is provided, which includes a housing 100, a diaphragm 200, a magnetic circuit mechanism 300, and a voice coil 210.
[0035] Among them, referring to Figure 1 and Figure 2 , the housing 100 is provided with a receiving cavity.
[0036] Among them, referring to Figure 1 and Figure 2 , the diaphragm 200 is arranged in the receiving cavity and its periphery is fixedly connected to the inner wall of the receiving cavity. The diaphragm 200 divides the receiving cavity into a front cavity 110 and a rear cavity 120, and the volume ratio of the front cavity 110 to the rear cavity 120 is 0.4 - 0.7. The volume ratio of the front cavity 110 to the rear cavity 120 can be 0.4, 0.55, or 0.7, and preferably 0.55.
[0037] Among them, referring to Figure 1 and Figure 2, the magnetic circuit mechanism 300 is disposed in the rear cavity 120, and a magnetic gap 310 is formed between the magnetic circuit mechanism 300 and the housing 100. And
[0038] Among them, referring to Figure 1 and Figure 2 , the voice coil 210 is disposed in the rear cavity 120. One end of the voice coil 210 is connected to the diaphragm 200, and the other end of the voice coil 210 extends into the magnetic gap 310.
[0039] Among them, referring to Figure 1 and Figure 2 , one end of the housing 100 is provided with a sound outlet 130 communicating with the front cavity 110, and the other end of the housing 100 is provided with a first air hole 140 communicating with the rear cavity 120.
[0040] Compared with the prior art, one or more of the above technical solutions in the moving coil loudspeaker provided by the embodiment of the present invention have at least one of the following technical effects:
[0041] Referring to Figure 1 and Figure 2 , in use, the magnetic circuit mechanism 300 forms a magnetic field in the magnetic gap 310. When the voice coil 210 is energized, the voice coil 210 reciprocates in the magnetic field of the magnetic gap 310, thereby driving the diaphragm 200 to reciprocate and generate sound waves. The sound waves perform movements such as reflection and diffraction in the accommodating cavity, and then pass through the sound outlet 130 to reach the outside of the housing 100, so that the sound distortion is small.
[0042] Referring to Figure 2 and Figure 3 , when the volume ratio of the front cavity 110 to the rear cavity 120 is 0.55, through experimental tests, referring to Figure 3 , with the frequency (Hz) as the abscissa and the decibel value (dB) as the ordinate, the sound wave curve generated by the vibration of the diaphragm 200 is tested. Curve A is the experimental group, and curve B is the control group; among them, curve A is the sound wave curve of the present invention with the volume ratio of the front cavity 110 to the rear cavity 120 being 0.55, and curve B is the sound wave curve of the conventional volume ratio of the front cavity 110 to the rear cavity 120 in the prior art; it can be seen from the comparison of curve A and curve B that at the same frequency, the decibel of the sound of curve A is greater, especially in the range of 1k - 20kHz, improving the high-frequency sound effect of the loudspeaker and being widely compatible with more earphones.
[0043] Further, referring to Figure 1 and Figure 2, the rear cavity 120 includes a first cavity 121 and a second cavity 122. The diameter of the first cavity 121 is larger than that of the second cavity 122. The periphery of the diaphragm 200 is fixedly connected to the inner wall of the first cavity 121. By arranging the diaphragm 200 in the larger first cavity 121, the vibration amplitude of the diaphragm 200 is increased. The magnetic circuit mechanism 300 is installed in the second cavity 122, and the magnetic circuit mechanism 300 provides a stable magnetic field for the magnetic gap 310.
[0044] Further, referring to Figure 1 and Figure 2 , the diameter of the second cavity 122 is 6 - 7 mm. Among them, the diameter of the second cavity 122 can be 6 mm, 6.3 mm or 7 mm, preferably 3.2 mm; the height of the second cavity 122 is 1.7 - 2.1 mm. Among them, the height of the second cavity 122 can be 1.7 mm, 1.9 mm or 2.1 mm, preferably 1.9 mm. The width of the magnetic gap 310 is 0.6 - 0.7 mm. Among them, the width of the magnetic gap 310 can be 0.6 mm, 0.65 mm or 0.7 mm, preferably 0.65 mm. The height of the voice coil 210 is 1 - 1.5 mm. Among them, the height of the voice coil 210 can be 1 mm, 1.25 mm or 1.5 mm, preferably 1.25 mm; the length of the voice coil 210 extending into the magnetic gap 310 is 0.7 - 1 mm. Among them, the length of the voice coil 210 extending into the magnetic gap 310 can be 0.7 mm, 0.85 mm or 1 mm, preferably 0.85 mm.
[0045] In another embodiment of the present invention, referring to Figure 1 and Figure 2 , the magnetic circuit mechanism 300 includes a magnet 320 and a washer 330. The magnet 320 is disposed in the middle of the second cavity 122, and the washer 330 is disposed at one end of the magnet 320 close to the diaphragm 200. The washer 330 is used for magnetic conduction, so that the magnet 320 provides a uniform magnetic field to the magnetic gap 310 through the washer 330, and the voice coil 210 reciprocates in the uniform magnetic field, so that the bone conduction speaker has high sensitivity and low distortion.
[0046] Further, referring to Figure 1 and Figure 2 , air channels 340 are provided through the centers of both the magnet 320 and the washer 330. The two ends of the air channels 340 are respectively communicated with the rear cavity 120 and the first air hole 140. The rear cavity 120 is in air circulation with the outside through the air channels 340 and the first air hole 140, which is used to balance the air cavity, reduce the resistance of the second cavity 122 to the vibration of the diaphragm 200, make the diaphragm 200 vibrate smoothly, and improve the sound quality.
[0047] Further, the first air hole 140 is covered with a filter net 180 which is used to filter dust in the air and prevent the dust from entering the rear cavity 120 through the first air hole 140, with a stable structure. Among them, the filter net 180 can be a nylon net.
[0048] Further, referring to Figure 1 and Figure 2 , the diameter of the magnet 320 is 4.6 - 5.8 mm. Among them, the diameter of the magnet 320 can be 4.6 mm, 5 mm or 5.8 mm, preferably 5 mm; the height of the magnet 320 is 1.3 - 1.8 mm. Among them, the height of the magnet 320 can be 1.3 mm, 1.5 mm or 1.8 mm, preferably 1.5 mm. The diameter of the washer 330 is 4.6 - 5.8 mm. Among them, the diameter of the washer 330 can be 4.6 mm, 5 mm or 5.8 mm, preferably 5 mm; the height of the washer 330 is 0.3 - 0.6 mm. Among them, the height of the washer 330 can be 0.3 mm, 0.4 mm or 0.6 mm, preferably 0.4 mm.
[0049] Further, referring to Figure 1 and Figure 2 , the volume of the front cavity 110 is 30 - 42 mm 3 , among which, the volume of the front cavity 110 is 30 mm 3 , 39 mm 3 or 42 mm 3 , preferably 39 mm 3 ; the volume of the rear cavity 120 is 60 - 75 mm 3 , among which, the volume of the rear cavity 120 can be 60 mm 3 , 66 mm 3 or 75 mm 3 , preferably 66 mm 3 .
[0050] Further, referring to Figure 1 and Figure 2 , the housing 100 includes a yoke 160 and a cover 170. The cover 170 is covered on the opening of the yoke 160, and an accommodation cavity is formed between the cover 170 and the yoke 160. The cover 170 and the yoke 160 can be fixedly connected by means of snap connection, bonding, welding or screwing, etc. The diaphragm 200 is located between the cover 170 and the yoke 160. Setting the housing 100 as a combined structure of the yoke 160 and the cover 170 facilitates the installation of the diaphragm 200, the magnetic circuit mechanism 300 and the voice coil 210 in the accommodation cavity. A magnetic gap 310 is formed between the magnetic circuit mechanism 300 and the yoke 160.
[0051] Further, referring to Figure 1 and Figure 2, at least one second air hole 150 communicating with the first cavity 121 is formed in the outer wall of the housing 100. The second air hole 150 facilitates the air circulation between the first cavity 121 and the outside, is used to balance the air cavity, reduce the resistance of the first cavity 121 to the diaphragm 200 during vibration, make the diaphragm 200 vibrate smoothly, and improve the sound quality. Preferably, a plurality of second air holes 150 communicating with the first cavity 121 are uniformly formed in the outer wall of the housing 100.
[0052] Furthermore, a stepped platform 161 is provided at one end of the U-shaped iron 160 close to the cover body 170, and the second air hole 150 is arranged at the stepped platform 161. Such a setting avoids the blockage of the second air hole 150 and ensures the air circulation between the first cavity 121 and the outside through the second air hole 150.
[0053] Furthermore, an extended ring 171 extends from the opening periphery of the cover body 170. An annular groove 172 is formed between the extended ring 171 and the U-shaped iron 160. An annular filter screen (not shown in the figure) is adaptively accommodated in the annular groove 172. The annular filter screen is used to filter dust in the air and prevent dust from entering the second air hole 150 from the second air hole 150, and the structure is stable. Preferably, the annular filter screen can be a nylon mesh. At the same time, the extended ring 171 increases the height of the side wall of the cover body 170, so that the side wall of the cover body 170 can be firmly and tightly abutted against the wall of the speaker mounting groove, and the installation is stable.
[0054] The rest of this embodiment is the same as that of the first embodiment. For the features not explained in this embodiment, the explanations of the first embodiment are adopted and will not be elaborated here.
[0055] The above content is a further detailed description of the present invention in combination with specific preferred embodiments. It cannot be determined that the specific implementation of the present invention is only limited to these descriptions. For those of ordinary skill in the technical field to which the present invention belongs, without departing from the concept of the present invention, its architecture form can be flexible and changeable, and a series of products can be derived. Just making several simple deductions or substitutions should be regarded as belonging to the patent protection scope determined by the claims submitted for the present invention.
Claims
1. A dynamic speaker, characterized in that: include: A housing, wherein a receiving cavity is provided in the housing; A diaphragm, wherein the diaphragm is disposed in the accommodating cavity and its periphery is fixedly connected to the inner wall of the accommodating cavity, the diaphragm divides the accommodating cavity into a front cavity and a rear cavity, and the volume ratio of the front cavity to the rear cavity is 0.4-0.7; A magnetic circuit mechanism, wherein the magnetic circuit mechanism is disposed in the rear cavity, and a magnetic gap is formed between the magnetic circuit mechanism and the housing; as well as A voice coil, wherein the voice coil is disposed in the rear cavity, one end of the voice coil is connected to the diaphragm, and the other end of the voice coil extends into the magnetic gap; A sound outlet connected to the front cavity is formed at one end of the shell, and a first air hole connected to the rear cavity is formed at the other end of the shell.
2. The dynamic speaker according to claim 1, characterized in that: The rear cavity includes a first cavity and a second cavity; the diameter of the first cavity is larger than the diameter of the second cavity, the periphery of the diaphragm is fixedly connected to the inner wall of the first cavity; the magnetic circuit mechanism is installed in the second cavity.
3. The dynamic speaker according to claim 2, characterized in that: The outer wall of the shell is provided with at least one second air hole communicating with the first cavity.
4. The dynamic speaker according to claim 2, characterized in that: The diameter of the second cavity is 6-7 mm, and the height of the second cavity is 1.7-2.1 mm; the width of the magnetic gap is 0.6-0.7 mm; the height of the voice coil is 1-1.5 mm, and the length of the voice coil extending into the magnetic gap is 0.7-1 mm.
5. The dynamic speaker according to claim 2, characterized in that: The magnetic circuit mechanism includes a magnet and a washer; the magnet is arranged in the middle of the second cavity, and the washer is arranged at one end of the magnet close to the diaphragm.
6. The dynamic speaker according to claim 5, characterized in that: An air channel is provided through the center of the magnet and the washer, and two ends of the air channel are respectively connected with the rear cavity and the first air hole.
7. The dynamic speaker according to claim 5, characterized in that: The diameter of the magnet is 4.6-5.8 mm, and the height of the magnet is 1.3-1.8 mm; the diameter of the washer is 4.6-5.8 mm, and the height of the washer is 0.3-0.6 mm.
8. The dynamic speaker according to any one of claims 1 to 7, characterized in that: The volume of the front cavity is 30-42mm 3 , the volume of the rear cavity is 60-75mm 3 .
9. The dynamic speaker according to any one of claims 1 to 7, characterized in that: The shell includes a U-iron and a cover body; the cover body is arranged to cover the opening of the U-iron cavity, the accommodating cavity is formed between the cover body and the U-iron, and the diaphragm is located between the cover body and the U-iron; the magnetic gap is formed between the magnetic circuit mechanism and the U-iron.
10. The dynamic speaker according to any one of claims 1 to 7, characterized in that: The first air hole cover is provided with a filter screen.