CN111063324A - Tommy type antique speaker system - Google Patents
Tommy type antique speaker system Download PDFInfo
- Publication number
- CN111063324A CN111063324A CN201911343666.6A CN201911343666A CN111063324A CN 111063324 A CN111063324 A CN 111063324A CN 201911343666 A CN201911343666 A CN 201911343666A CN 111063324 A CN111063324 A CN 111063324A
- Authority
- CN
- China
- Prior art keywords
- loudspeaker
- voice coil
- magnet
- magnetizer
- loudspeakers
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- 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
- H04R9/025—Magnetic circuit
-
- 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
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
Abstract
The invention discloses a castrated drum type antique loudspeaker system which comprises two loudspeakers with opposite phases, wherein the two loudspeakers are arranged back to back and fixedly connected through a middle connecting piece. The advantages of this kind of novel tommy drum formula archaize speaker system include: the structure is novel, and the transmission can be well carried out in the direction of 360 degrees in space; if two loudspeakers adopt two related big and small voice coils to work, both low-frequency response and high-frequency response can be considered.
Description
Technical Field
The invention relates to the technical field of loudspeakers, in particular to a tomcat drum type antique loudspeaker system.
Background
The tomcat drum is a drum in ancient China. The tomcat is called tomcat because the tomcat is covered on two sides and has a thin waist, the tomcat is used as the drum skin, the two drum skins are connected by an elastic rope and are knocked by a drumstick to vibrate and sound. Ancient times, residents of Tortoise, Gao Chang, Shu le, Tian Zhu, etc. all use tomcat. A common type of tomcat drum is shown in figure 1 in shape and configuration.
The sounds emitted from the drum of castrated tomcat are mainly the second degree of yang rhythm in the twelve temperaments of ancient times. The castrated tomcat has loud and penetrating tone, and is suitable for showing the fierce and cheerful songs.
Disclosure of Invention
The invention aims to provide a novel drum type antique loudspeaker system.
First aspect provides a tomcat antique speaker system, includes two speakers opposite in phase, two speakers set up back to back, through middle connecting piece fixed connection.
Optionally, the system further includes a capacitance shunt circuit, configured to shunt an input signal and then input the signal to the two speakers, so that each speaker mainly operates in a specific frequency band.
Optionally, the voice coils of the two speakers are different in size, such that: the two loudspeakers work simultaneously in the low frequency band, and the loudspeaker with the small voice coil works in the high frequency band.
Optionally, the magnetic circuit system of the speaker includes: encircle the magnetic ring that the voice coil loudspeaker voice coil set up, be located the magnet at voice coil loudspeaker voice coil center, be located the magnetizer at speaker back, the magnet is fixed on the magnetizer, the magnetizer is fixed on the intermediate junction spare.
Optionally, the magnet is a halbach array magnet.
Optionally, the magnetic circuit system includes a magnetic steel ring and a T-iron, the magnetic steel ring surrounds the voice coil, and the T-iron includes an iron core located at the center of the voice coil and a T-iron plate located at the back of the speaker and connected to the iron core.
In a second aspect, there is provided a tomcat-drum antique speaker system comprising a moving coil speaker and a passive radiator; the moving coil loudspeaker and the passive radiator are connected back to back and are fixedly connected through a middle connecting piece.
Optionally, the magnetic circuit system of the speaker includes: encircle the magnetic ring that the voice coil loudspeaker voice coil set up, be located the magnet at voice coil loudspeaker voice coil center, be located the magnetizer at speaker back, the magnet is fixed on the magnetizer, the magnetizer is fixed on the intermediate junction spare.
Optionally, the magnet is a halbach array magnet.
Optionally, the cavity of the speaker and the cavity of the passive radiator are communicated through a channel provided on the intermediate connecting member.
According to the technical scheme, the embodiment of the invention has the following advantages:
the castrated drum type antique loudspeaker system is formed by connecting two loudspeakers with different (or same) sizes and different (or same) parameters but opposite phases back to back, and forming a structure similar to a castrated drum by two voice coils with different (or same) sizes, so that a loudspeaker system with good frequency response is assembled. This kind of novel tommy drum formula loudspeaker system modelled after an antique, its advantage is: the structure is novel, and the transmission can be well carried out in the direction of 360 degrees in space; if two loudspeakers adopt two related big and small voice coils to work, both low-frequency response and high-frequency response can be considered.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the embodiments and the drawings used in the description of the prior art, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
FIG. 1 is a schematic illustration of a common tomcat;
fig. 2 is a schematic structural diagram of a tomcat antique speaker system according to an embodiment of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terms "first," "second," "third," and the like in the description and in the claims, and in the above-described drawings, are used for distinguishing between different objects and not for describing a particular order. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.
The following are detailed descriptions of the respective embodiments.
The embodiment of the invention provides a tomcat antique loudspeaker system (loudspeaker system for short), which is characterized in that two loudspeakers with different (or same) sizes and different (or same) parameters but opposite phases (or phases) are arranged back to back and fixedly connected through a middle connecting piece. The loudspeaker can adopt a moving coil type loudspeaker, each loudspeaker comprises a voice coil, and two different (or same) voice coils are elastically connected and are in circuit connection. Thereby forming a structure similar to a tomcat drum.
Alternatively, the loudspeaker system may be provided with a capacitor CEThe input signal is divided into two signals to form a capacitance dividing circuit (namely a capacitance frequency dividing circuit) which is used for dividing the input signal and then respectively inputting the divided signals to the two loudspeakers, so that each loudspeaker mainly works in a specific frequency band.
In some embodiments, it is assumed that the respective voice coils of the two speakers are different in size. Suppose that the inductance L of the voice coil (large voice coil) of the first loudspeaker1Resistance rE1(ii) a Inductance L of the voice coil (small voice coil) of the second loudspeaker2Resistance rE2(ii) a In the mechanical circuit m1Mass of the large voice coil, m2Is the mass of the small voice coil. Assuming a capacitance C at low frequenciesEInductance L of the voice coil with large reactance ratio1And a resistance rE1Large, if the current flowing through the two voice coils is the same, the force C dividing the voice coil into two partsMForce ratio m1Force impedance zm1Large and therefore both voice coils are in a low frequency state. Capacitance C at high frequencyEHas a reactance higher than that of the inductance L of the large voice coil1And a resistance rE1Small, smaller voice coil inductance L2And a resistance rE2Small, then all current will flow into the small voice coil force CMForce ratio m1Force impedance zm1Therefore, the small voice coil is urged at a high frequency, and the large voice coil does not substantially operate.
As above, the voice coils of the two speakers are different in size, so that: the two loudspeakers work simultaneously in the low frequency band, and the loudspeaker with the small voice coil works in the high frequency band. Wherein, the high frequency is higher than 2KHz or 2.5KHz, and the low frequency is lower than 500Hz or 1 KHz.
To sum up, this kind of neotype tommy drum formula loudspeaker system modelled after an antique, its advantage includes: two connected large and small voice coils work, both low-frequency and high-frequency responses can be considered, and the frequency is 360 DEG0Has good propagation in the direction of (2).
Fig. 2 is an exploded schematic view of a speaker system according to an embodiment of the present invention.
The loudspeaker system comprises two loudspeakers, a first loudspeaker Y1 and a second loudspeaker Y2, which are arranged back-to-back and fixedly connected by means of a middle connecting piece L.
Taking the first speaker Y1 as an example, the speaker structurally includes a vibration system and a magnetic circuit system. The vibration system may include: the cone 1 bears the basin frame 2 of cone 1, hangs the voice coil loudspeaker voice coil 3 of connecting in cone 1 bottom to and, be used for supporting the centering brace of voice coil loudspeaker voice coil 3. The magnetic circuit system may include: encircle the magnetic ring 4, 5 that voice coil 3 set up are located the magnet 7 at 3 centers of voice coil, are located the magnetizer 8 at speaker back, magnet 7 is fixed on magnetizer 8, magnetizer 8 is fixed on intermediate junction spare L.
Similarly, the vibration system of the second speaker Y2 includes: the voice coil loudspeaker comprises a cone 18, a cone frame 17 for bearing the cone 18, a voice coil 15 which is connected to the bottom of the cone 18 in a hanging mode, and a centering support piece 16 for supporting the voice coil 15. The magnetic circuit system of the second speaker Y2 includes: encircle magnetic conductive rings 14, 13 that voice coil 15 set up, be located the magnet 11 at voice coil 15 center, be located the magnetizer 10 at speaker back, magnet 11 is fixed on magnetizer 10, magnetizer 10 is fixed on intermediate junction spare L.
Wherein the magnets 7, 11 may be halbach array magnets.
The middle connecting piece L can be a connecting disc 9 made of hard plastic plates and the like.
The back of the first speaker Y1 may be provided with a connection ring 6 made of a hard plastic plate or the like, and the back of the second speaker Y2 may be provided with a connection ring 12 made of a hard plastic plate or the like.
Optionally, the connecting disc 9, the connecting ring 6, and the connecting ring 12 may be respectively provided with circular holes at corresponding positions, and are fastened and connected by bolts.
As mentioned above, the loudspeaker system can be formed by connecting two loudspeakers with the same size back to back, wherein columnar strip-shaped magnets are respectively and vertically fixed on a connecting circular ring of a hard plastic plate in the middle of the loudspeaker system. Two speakers are connected with voice coils which are freely suspended outside the magnet on respective voice coil frameworks, the voice coils are respectively bonded with speaker cones on two sides, and the phases of the two voice coils are opposite. In order to enhance the magnetic force, the magnet may employ a halbach linear magnetic array magnet. With a hel g linear magnetic array, a much stronger magnetic force than a typical magnet can be obtained.
The loudspeaker system of the invention has certain requirements on process realization, and a special jig system can be adopted to assist processing and assembly. For example, first, coordinates are determined, and a direction facing an operator is taken as a Z-axis in a direction parallel to the ground; the connecting line direction of the left hand and the right hand of the operator is an X axis; the height direction perpendicular to the ground is the Y axis. A Z clamp capable of moving forwards or backwards can be arranged in the Z-axis direction; the left side and the right side of the Y axis are symmetrically provided with a Y clamp for assembling the loudspeaker respectively, the two Y clamps can rotate around the Z axis in the XY plane, and the assembling of the loudspeaker is carried out when one of the Y clamps is positioned on a station which can be operated by the Z axis position in front of an operator; after the loudspeaker is assembled, the loudspeaker can rotate in an XY plane by an angle of pi around a Z axis, so that the other loudspeaker symmetrical to the loudspeaker is positioned on an operable station at the Z axis position in front of an operator, and the assembly of the other loudspeaker is carried out; for two Y-clamps, it is movable in the X-axis direction to change its position from the Z-axis.
Optionally, the loudspeaker of the invention, its basin shelf is different from the commonly used loudspeaker basin shelf, it can have a "fin" on the periphery of bottom, it has 3-4 round holes for fastening the bolt symmetrically distributed on it, it connects with connecting the circular ring 6, 12 after fixing. And a clamp is arranged on the Z axis and clamps a connecting disc 9 as an intermediate connecting piece L, magnetizers 8 and 10 are respectively arranged on two sides of the center of the connecting disc, and magnets in the form of strip-shaped magnetic steels are respectively and vertically fixed on the magnetizers 8 and 10. 3-4 round holes for fixing the fastening bolts are also distributed around the connecting disc, after the two loudspeakers are assembled, the clamp in the Z-axis direction moves to a station in front of an operator, and then the positions of the two loudspeakers are adjusted to proper positions, so that 3-4 round holes for fixing the fastening bolts on the connecting rings 6 and 12 connected by the flanges on the peripheries of the two loudspeaker frames and 3-4 round holes for fixing the fastening bolts on the connecting disc clamped by the clamp in the Z-axis are positioned and superposed and then fixed by the fixing bolts.
It should be noted that the embodiment of the present invention is not limited to the structure shown in fig. 1.
In other embodiments, the magnetic circuit system of the speaker may adopt another structure, and the magnetic circuit system includes a magnetic steel ring and a T-iron, the magnetic steel ring is disposed around the voice coil, and the T-iron includes an iron core located in the center of the voice coil and a T-iron flat plate located at the back of the speaker and connected to the iron core. Wherein, the magnetic steel ring can adopt a ferrite magnetic steel ring. By freely suspending two voice coils with opposite phases in a magnet space (at the periphery of the T iron and between the T iron and the magnetic steel ring), when an audio signal is introduced into the voice coils, the voice coils are driven to produce sound. With reference to fig. 1, if the designed magnetic circuit system is formed by a magnetic steel ring and a T-iron, the magnetic rings shown by reference numerals 5 and 13 may be changed into ferrite magnetic steel rings with the same size, and the ferrite magnetic steel rings may adopt a radial magnetization mode; the magnets shown by reference numerals 7 and 11 are changed into magnetizers, and T-iron integrating the magnetizers 7 and 8 and T-iron integrating the magnetizers 11 and 10 are formed by one-time processing.
In some embodiments, the speaker system of the present invention is also not limited to the use of two speakers connected back-to-back, but may include a moving coil speaker and a passive radiator; the moving coil loudspeaker and the passive radiator are connected back to back and are fixedly connected through a middle connecting piece.
The passive radiator is similar to the moving coil loudspeaker, including a cone, a frame, but without a voice coil and magnetic circuitry. The passive radiator acts as a passive unit, similar in appearance to the loudspeaker acting as an active unit, but without the voice coil and driver magnet, and with only one cone and frame, not connected to any voice coil or circuit. The passive radiator can be used to adjust the bass sound so that the designer can adjust the timbre of the sound box as a whole. The passive radiator can be driven by the active unit to generate sound passively. The cavity of the loudspeaker is communicated with the cavity of the passive radiator through a channel arranged on the middle connecting piece.
Wherein, the magnetic circuit system of the loudspeaker can comprise: encircle the magnetic ring that the voice coil loudspeaker voice coil set up, be located the magnet at voice coil loudspeaker voice coil center, be located the magnetizer at speaker back, the magnet is fixed on the magnetizer, the magnetizer is fixed on the intermediate junction spare. The magnet may be a halbach array magnet, a neodymium iron boron magnet, or a ferrite magnet.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to the related descriptions of other embodiments.
The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; those of ordinary skill in the art will understand that: the technical solutions described in the above embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A castrated ancient imitation loudspeaker system is characterized in that,
the loudspeaker comprises two loudspeakers with opposite phases, wherein the two loudspeakers are arranged back to back and are fixedly connected through a middle connecting piece.
2. The system of claim 1,
the system also comprises a capacitance shunt circuit which is used for shunting input signals and then respectively inputting the input signals to the two loudspeakers, so that each loudspeaker mainly works in a specific frequency band.
3. The system of claim 2,
the voice coils of the two speakers are different in size so that: the two loudspeakers work simultaneously in the low frequency band, and the loudspeaker with the small voice coil works in the high frequency band.
4. The system of claim 1,
the magnetic circuit system of the loudspeaker comprises: encircle the magnetic ring that the voice coil loudspeaker voice coil set up, be located the magnet at voice coil loudspeaker voice coil center, be located the magnetizer at speaker back, the magnet is fixed on the magnetizer, the magnetizer is fixed on the intermediate junction spare.
5. The system of claim 4,
the magnet is a Halbach array magnet, a neodymium iron boron magnet or a ferrite magnet.
6. The system of claim 1,
the magnetic circuit system comprises a magnetic steel ring and T iron, the magnetic steel ring surrounds the voice coil, and the T iron comprises an iron core located at the center of the voice coil and a T iron plate located on the back of the loudspeaker and connected with the iron core.
7. A castrated ancient imitation loudspeaker system is characterized in that,
the passive radiator comprises a moving coil loudspeaker and a passive radiator;
the moving coil loudspeaker and the passive radiator are connected back to back and are fixedly connected through a middle connecting piece.
8. The system of claim 7,
the magnetic circuit system of the loudspeaker comprises: encircle the magnetic ring that the voice coil loudspeaker voice coil set up, be located the magnet at voice coil loudspeaker voice coil center, be located the magnetizer at speaker back, the magnet is fixed on the magnetizer, the magnetizer is fixed on the intermediate junction spare.
9. The system of claim 8,
the magnet is a Halbach array magnet, a neodymium iron boron magnet or a ferrite magnet.
10. The system of claim 1,
the cavity of the loudspeaker is communicated with the cavity of the passive radiator through a channel arranged on the middle connecting piece.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911343666.6A CN111063324A (en) | 2019-12-24 | 2019-12-24 | Tommy type antique speaker system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911343666.6A CN111063324A (en) | 2019-12-24 | 2019-12-24 | Tommy type antique speaker system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111063324A true CN111063324A (en) | 2020-04-24 |
Family
ID=70302721
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911343666.6A Pending CN111063324A (en) | 2019-12-24 | 2019-12-24 | Tommy type antique speaker system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111063324A (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1109669A (en) * | 1994-03-31 | 1995-10-04 | 李代繁 | Full spectrum electroacoustic enery transducer |
| US20040008859A1 (en) * | 2002-07-01 | 2004-01-15 | Speaker Electronic (Jiashan) Co., Ltd. | Loudspeaker having double symmetric magnet-circuits, double voice coils and double dampers |
| CN1691836A (en) * | 2004-04-23 | 2005-11-02 | 何成郭 | Power frequency divider with complete definition and fidelity |
| CN201986139U (en) * | 2011-03-07 | 2011-09-21 | 陈忠发 | Sound box with coaxial full-range loudspeaker |
| CN102821342A (en) * | 2011-06-10 | 2012-12-12 | 宁波升亚电子有限公司 | Loudspeaker |
| CN203086702U (en) * | 2013-01-28 | 2013-07-24 | 深圳市奥尼电子工业有限公司 | Resonant sound equipment |
| CN103888878A (en) * | 2014-04-09 | 2014-06-25 | 上海依镓人电气科技有限公司 | Three-dimensional wave coaxial motor-driven loudspeaker |
| CN205105399U (en) * | 2015-11-19 | 2016-03-23 | 郑汉水 | Two unification coaxial speakers and frequency dividing circuit thereof |
| CN206413193U (en) * | 2017-02-15 | 2017-08-15 | 微鲸科技有限公司 | Bidirectional sounding loudspeaker and sound-box device |
-
2019
- 2019-12-24 CN CN201911343666.6A patent/CN111063324A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1109669A (en) * | 1994-03-31 | 1995-10-04 | 李代繁 | Full spectrum electroacoustic enery transducer |
| US20040008859A1 (en) * | 2002-07-01 | 2004-01-15 | Speaker Electronic (Jiashan) Co., Ltd. | Loudspeaker having double symmetric magnet-circuits, double voice coils and double dampers |
| CN1691836A (en) * | 2004-04-23 | 2005-11-02 | 何成郭 | Power frequency divider with complete definition and fidelity |
| CN201986139U (en) * | 2011-03-07 | 2011-09-21 | 陈忠发 | Sound box with coaxial full-range loudspeaker |
| CN102821342A (en) * | 2011-06-10 | 2012-12-12 | 宁波升亚电子有限公司 | Loudspeaker |
| CN203086702U (en) * | 2013-01-28 | 2013-07-24 | 深圳市奥尼电子工业有限公司 | Resonant sound equipment |
| CN103888878A (en) * | 2014-04-09 | 2014-06-25 | 上海依镓人电气科技有限公司 | Three-dimensional wave coaxial motor-driven loudspeaker |
| CN205105399U (en) * | 2015-11-19 | 2016-03-23 | 郑汉水 | Two unification coaxial speakers and frequency dividing circuit thereof |
| CN206413193U (en) * | 2017-02-15 | 2017-08-15 | 微鲸科技有限公司 | Bidirectional sounding loudspeaker and sound-box device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN201754614U (en) | Multifunctional mini speaker | |
| US3649776A (en) | Omnidirectional horn loudspeaker | |
| WO2020140545A1 (en) | Sound generating device | |
| EP2663092A2 (en) | Acoustic device | |
| CN104902393A (en) | Electroacoustic conversion device | |
| JPH03504310A (en) | loudspeaker | |
| CN104869508A (en) | Electroacoustic conversion device | |
| CN107071669A (en) | A kind of loudspeaker earpiece and mobile terminal | |
| CN107509142B (en) | Multifunctional loudspeaker | |
| CN209120479U (en) | More body loudspeakers | |
| US2426948A (en) | Coaxial dual-unit electrodynamic loud-speaker | |
| CN105407430A (en) | Sound effect device and manufacturing method therefor | |
| CN202035134U (en) | Loudspeaker with double suspended fringes | |
| WO2020181893A1 (en) | Sound generation device and electronic product | |
| CN111063324A (en) | Tommy type antique speaker system | |
| CN205105393U (en) | Miniature dull and stereotyped loudspeaker of spring board | |
| CN205726355U (en) | Magnetic circuit system and speaker | |
| CN2387687Y (en) | Ball top high pitch horn coaxial all-band loudspeaker | |
| WO2024045234A1 (en) | Circuit and sound production device | |
| CN101931843A (en) | Voice frequency vibrating device | |
| RU2744770C1 (en) | Electrodynamic drive for flat loudspeakers | |
| CN208798145U (en) | A kind of simple coaxial horn of structure | |
| CN2618396Y (en) | Binary body audio frequency loudspeaker | |
| CN102036150A (en) | Combined type coaxial loudspeaker | |
| CN107517430B (en) | Double-washer micro loudspeaker |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |