CN102157143A - Electronic piano sound box device - Google Patents
Electronic piano sound box device Download PDFInfo
- Publication number
- CN102157143A CN102157143A CN 201110045278 CN201110045278A CN102157143A CN 102157143 A CN102157143 A CN 102157143A CN 201110045278 CN201110045278 CN 201110045278 CN 201110045278 A CN201110045278 A CN 201110045278A CN 102157143 A CN102157143 A CN 102157143A
- Authority
- CN
- China
- Prior art keywords
- lower gear
- pianotron
- loudspeaker
- audio amplifier
- plate
- 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
Abstract
The invention relates to an electronic piano sound box device, which is characterized by comprising a long groove body formed by splicing three long plates which are a lower crosspiece front plate, a lower crosspiece panel and a lower crosspiece rear plate; wherein two ends of the groove body are provided with edge supporting plates; the middle part of the groove body is provided with two middle supporting plates; a pedal set is connected between the two middle supporting plates; and two cover plates are arranged to respectively close a space formed by the edge supporting plates at the left and the right sides of the groove body, the middle supporting plates and the groove body so as to form two symmetrical sound box cavities which take the pedal set as the center. A certain inclined angle is formed between the lower crosspiece panel and the horizontal plane; the two ends of the lower crosspiece panel are symmetrically provided with loudspeaker holes and phase reversing holes; loudspeakers are respectively arranged on the loudspeaker holes on the lower crosspiece panel corresponding to the two sound box cavities; a short partition and a long partition are arranged to divide a phase reversing pipe in each loudspeaker cavity; and the phase reversing holes are communicated with the sound box cavities through the phase reversing pipe. Compared with the prior art, the electronic piano sound box device is novel and practical, and is capable of improving the loudspeaker effect and extending the function of the electronic piano as the active sound box.
Description
Technical field
The present invention relates to technical field is the musical instrument class, relates to a kind of pianotron loudspeaker box device specifically, particularly is arranged on the loudspeaker acoustic enclosure device of the pedal structure left and right sides, pianotron lower end.
Background technology
Mellotron and pianotron are a kind of by the pronunciation of electronics source of sound, export the electronic musical instrument of loudspeaker plays after circuit amplifies to, and the setting of loudspeaker and mounting structure thereof directly affect the tonequality and the acoustics of electronic musical instrument.
The mounting structure of loudspeaker can reduce two kinds in mellotron and the pianotron at present: most of is non-loudspeaker box structure, and small part is a loudspeaker box structure.Non-loudspeaker box structure refers to loudspeaker is directly installed in the same qin case that keyboard is set, and promptly the left and right acoustic channels loudspeaker is installed in same bigger, the unsealed resonating body, can not give full expression to the sound field range and the audio of left and right acoustic channels; Most of pianotrons are easy for installation and visual appearance, directly the left and right acoustic channels loudspeaker are installed on the qin box plate of perforate, make the loudspeaker radiation direction down, sound is transmitted to people's ear through ground return, since the absorption of ground materials, acoustic attenuation, and acoustic efficiency is very poor; Producer is also arranged for improving tonequality, less high pitch loudspeaker is installed on player's panel, and big slightly woofer still is installed on the qin box plate of perforate by volume restrictions, low frequency can not get promoting, and acoustic efficiency is barely satisfactory.Loudspeaker box structure refer in electronics (steel) qin is provided with the qin case of keyboard or outside additional independently audio amplifier, promptly surround audio amplifier together with sheet material and casing, the lifting acoustic efficiency particularly improves low frequency tonequality; But owing to be subjected to space constraint, general cavity is less attached to the audio amplifier in the qin case, and woofer is installed on the qin box plate of perforate, the sound downward radiation, and audio is also undesirable; And big slightly attached to the outer general cavity of audio amplifier of qin case, be the volume that has extended out the qin case in fact, both expended sheet material, influence visual effect again.
It is the sound signal amplification output of source of sound that the power amplifier of common pianotron and loudspeaker only are used for the pianotron mainboard, because acoustics is not fully up to expectations, rarely have the purposes that amplifies and play as other source of sound sound signal, the use value and the efficient of pianotron power amplifier and loudspeaker have been subjected to limitation.
Summary of the invention
Provide a kind of improved pianotron loudspeaker box device order of the present invention, particularly pianotron structure and the appearance effects to common is little, and the audio amplifier cavity is bigger, acoustic efficiency is good, be fit to use as the active audio amplifier of other source of sound sound signal, simple in structure, and cost is low, produces simple installation.
The technical solution used in the present invention is as follows: the lower gear that utilizes pianotron installation foot pedal group, with the recess sealing down of two ends, pedal group left and right sides lower gear, the two ends, the left and right sides that are supported on the pedal group together with lower gear form two symmetrical casings with the two boards material; The woofer hole of symmetry is set at the two ends, the left and right sides on lower gear surface, and promptly the inside top surface at two symmetrical casings of lower gear is provided with woofer; The paraphase hole of symmetry is set at the two ends, the left and right sides on lower gear surface, and in two symmetrical casings of lower gear, corresponding paraphase hole, respectively be separated out phase-reversing tube with sheet material, the opposite low frequency wave of phase place that the woofer back side is produced, the phase-reversing tube resonance in casing, derive and allow the resonance air communication cross paraphase hole, the resonance air-flow after the paraphase and the low frequency wave in woofer front can obviously promote loudspeaker low frequency radiation acoustic energy and efficient, the expansion low-frequency characteristic with superimposed.
For realizing technique scheme, design a kind of pianotron loudspeaker box device, comprise speaker hole, loudspeaker, guard, paraphase hole, breviseptum, long dividing plate, the lower gear panel, the lower gear header board, plate behind the lower gear, cover plate, the pedal group, intermediate support plate, marginal branch fagging and qin pin, about two groups of qin pin connect the bottom surface of piano key board casees, and be connected with lower cross plate, it is characterized in that by three block length bar sheet material lower gear header boards, the long recess body that plate is spliced into behind lower gear panel and the lower gear, the lower gear panel is the groove base, plate is both sides behind lower gear header board and the lower gear, two end regions at the groove body are respectively established the marginal branch fagging, respectively with the lower gear header board, plate connects behind lower gear panel and the lower gear, the middle part of groove body establish two intermediate support plates respectively with the lower gear header board, plate connects behind lower gear panel and the lower gear, connecting pin pedal group between two intermediate support plates, two cover plates difference closed recess body the right and left is set by the marginal branch fagging, the space that intermediate support plate and groove body constitute, forming two is centrosymmetric audio amplifier cavity with the pedal group.
The two ends of described lower gear panel are arranged with speaker hole, and the speaker hole in two audio amplifier cavitys on the corresponding lower gear panel is provided with loudspeaker respectively.
The left and right paraphase hole that is arranged with of described lower gear panel.
Described breviseptum and long dividing plate are partitioned into a phase-reversing tube in each audio amplifier cavity, paraphase hole is communicated with through phase-reversing tube and audio amplifier cavity.
The left and right symmetry of described lower gear panel upper surface is established the guard that connects speaker hole or paraphase hole.
The lower gear header board of described connection lower gear panel is low, and plate hight behind the lower gear, lower gear panel inclination angle scope 0-45 °, are arranged on loudspeaker axle center and surface level out of plumb in the audio amplifier cavity horizontal by certain inclination angle.
Described two audio amplifier cavitys are positioned at the below of lower cross plate, and the marginal branch fagging that constitutes the audio amplifier cavity is connected with the qin pin.
A kind of pianotron loudspeaker box device of the present invention, utilize the lower gear of pianotron installation foot pedal group and the cover plate of increase, also can obtain the sealing audio amplifier cavity of a pair of lifting audio, promptly remove breviseptum and the long dividing plate of cutting apart phase-reversing tube in the audio amplifier cavity, not establish paraphase hole and guard thereof.
The acoustical cotton material can be pasted or fill to a kind of pianotron loudspeaker box device of the present invention in the audio amplifier cavity, to absorb the acoustic wave segment radiation at the loudspeaker back side, weakens the influence that the standing wave interference waits other harmful reflection wave, improves the quality factor q value of audio amplifier.
A kind of pianotron loudspeaker box device of the present invention, the audio amplifier cavity is except that built-in woofer, can built-in middle pitch and high pitch loudspeaker, also middle pitch that can shape is less or high pitch loudspeaker are arranged in the keyboard casing on pianotron top, make acoustic radiating directly to the player.
A kind of pianotron loudspeaker box device of the present invention, the guard of speaker hole and paraphase hole can be provided with separately, also can be wholely set; Can be knitting guard, also can be metal or plastics guard; Guard can be arranged to fixed, also can be arranged to detachable.
The present invention compared with prior art, and is practical, novel in design, simple in structure, uses reliable, the acoustic radiating direction is reasonable, has promoted sound radiation pressure, has strengthened the sound field range, expanded low frequency characteristic, improved acoustics, extension the function of pianotron as active audio amplifier.
Description of drawings
The present invention is further described below in conjunction with drawings and Examples.
Fig. 1 is a forward synoptic diagram of the present invention.
Fig. 2 is a side-looking diagrammatic cross-section of the present invention.
Fig. 3 is the schematic top plan view of embodiment of the invention lower gear audio amplifier cavity.
Fig. 4 is the audio amplifier guard diagrammatic cross-section of the embodiment of the invention.
1. piano key board casees among the figure, 2. lower gear panel, 3. lower gear header board, 4. pedal group, 5. lower cross plate, 6. high pitch loudspeaker guard, 7. paraphase hole guard, 8. woofer guard, 9. qin pin, 10. infrared pair of control optoelectronic switch, 11. plate behind the lower gear, 12. marginal branch faggings, 13. cover plates, 14. long dividing plate, 15. breviseptum, 16. woofers, 17. high pitch loudspeakers, 18. intermediate support plate, 19. the high pitch loudspeaker hole, 20. paraphase holes, 21. woofer holes, 22. audio amplifier cloth, 23. woofer guard inner rings.
Embodiment
The present invention will be further described in conjunction with the accompanying drawings, and the manufacturing technology of this device is very clearly concerning this professional people.
In Fig. 1, piano key board case (1) is the first half of pianotron, and the structure below it is the latter half of pianotron.Two groups of qin pin (9) about the left and right sides of piano key board case (1) bottom surface connects respectively, about two groups of qin pin (9) connect the both sides of lower cross plate (5) respectively, and be connected with the lower gear two ends of forming by lower gear panel (2) and lower gear header board (3) etc., the middle part of lower gear is provided with pedal group (4), and the and arranged on left and right sides symmetry on lower gear panel (2) surface is established woofer guard (8).
Among the embodiment, paraphase hole and the guard (7) establishing high pitch loudspeaker and hole, guard (6) and establish for the expansion low-frequency response in the and arranged on left and right sides symmetry on lower gear panel (2) surface; In order to bring into play the range of sound field, woofer and hole, guard (8) are located at the outside of high pitch loudspeaker and hole, guard (6) and paraphase hole and guard (7), make the distance between the left and right sound channels woofer maximum.
Fig. 2 illustrates that lower gear header board (3) is low, plate behind the lower gear (11) height, plate (11) is formed the downward skewed slot body of recess behind lower gear header board (3), lower gear panel (2) and the lower gear, constitute lower gear audio amplifier cavity together with cover plate (13) and marginal branch fagging (12) etc., in establish woofer (16), high pitch loudspeaker (17), and the phase-reversing tube that constitutes by long dividing plate (14) and breviseptum (15).Among the embodiment, lower gear panel (2) both can promote lower gear audio amplifier cavity volume towards player's lopsidedness, strengthened bass effect, can make the audio frequency radiation direction facing to the player or the interior space again, and under the occasion, pianotron is placed on indoor the foot of a wall place mostly.Unless be necessary, lower gear panel (2) can level not tilt yet, or tilts in the opposite direction.
The present invention is to learn from other's strong points to offset one's weaknesses in conjunction with the patent " a kind of electrooptical device of musical instrument Dynamics keyboard " (number of patent application 201020108312.1) of having applied for, and Fig. 2 has illustrated the combination of two kinds of inventions.Key among Fig. 2 in the piano key board case (1) is wooden piano key, key afterbody below is provided with the infrared pair of control optoelectronic switch (10) that is used for the action of non-contact detecting key, but wooden piano key exists key to grow, account for the too much deficiency of keyboard casing area, leaves abundant leeway for the bigger medium and low spectrum loudspeaker of bore; The present invention is arranged on woofer (16) in the lower gear audio amplifier cavity of piano key board case (1) below, is electrically connected by the circuit in lead and the piano key board case (1), has remedied above-mentioned deficiency, has promoted acoustic characteristic.
Fig. 3 signal be lower gear audio amplifier cavity when not settling loudspeaker, structure is extremely simple.Usually the pianotron lower gear that contains pedal, for reaching requirement firm in structure, reliable, the lower gear operated by rotary motion polylith back up pad of spill, pedal is installed between back up pad.Fig. 3 illustrates the present invention on the basis of common down mark structure, has increased cover plate (13), plate (11), lower gear header board (3) and lower gear panel (2) formation audio amplifier cavity promptly and behind the intermediate support plate (18), marginal branch fagging (12), lower gear; And phase-reversing tube has also just increased long dividing plate (14) and breviseptum (15), promptly and cover plate (13), lower gear header board (3) and lower gear panel (2) are common constitutes.Be used to be provided with pedal group (4) between the intermediate support plate (18) of Fig. 3 lower gear middle part symmetry, embodiment is two pedal structures, also can be made as three pedal structures if desired.
For enlarging the radiation scope of sound box inverted tube resonance wave, prevent the air-flow noise, paraphase hole also can be export-oriented hydraucone, and fairshaped other materials body perhaps is set in the lower gear audio amplifier cavity, as PVC pipe etc., perhaps phase-reversing tube and paraphase hole being integrated is arranged in the lower gear audio amplifier cavity.Because the low-frequency resonant wave frequency is low in the phase-reversing tube, wavelength is longer, has several meters at least, can ignore and woofer positive with the mistiming between the sound wave and the influence of displacement frequently, and paraphase hole is arranged on any surface of audio amplifier cavity.Consider under many occasions, pianotron is placed in angle, indoor wall border district, adjacent other article of furniture, the back side, bottom surface and the side of lower gear audio amplifier cavity all are unfavorable for low frequency radiation, among the embodiment, paraphase hole (20) is located on the lower gear panel (2), and near the audio amplifier cavity stenosis of being convenient to form tubulose, promptly near lower gear header board (3) on one side.
According to the helmholtz resonance principle, phase-reversing tube is the air resonance chamber, the phase-reversing tube cross section is generally 0.1～0.4 times of woofer and effectively vibrates area, and value is big more, and the efficient of low frequency radiation is high more, embodiment selects 5 inches of bores for use, but phase-reversing tube cross section value 30 then, the angle of inclination of the height of known lower gear header board (3) and lower gear panel (2) can be calculated the area and the size dimension of trapezoidal breviseptum (15) thus, and the height of long dividing plate (14), phase-reversing tube length can be tried to achieve by following formula:
L is a phase-reversing tube length in the formula, and f0 is a woofer resonance frequency parameter, and c=34400cm/s is an acoustic velocity, and π=3.14 are circular constant, and S is phase-reversing tube sectional area (embodiment S ≈ 30cm
2), phase-reversing tube bore d ≈ √ S (the approximate square in embodiment phase-reversing tube cross section, d ≈ 5.5cm), V is an audio amplifier cavity useful volume.
Intermediate support plate (18) is apart from the height of the long dividing plate of distance=S/ (14) of long dividing plate (14) near-end.
So, the length ≈ l-of long dividing plate (14) (height of the long dividing plate of S/ (14)).
Embodiment is for asking vision, auditory effect and simplified manufacturing technique, high pitch loudspeaker hole (19) are designed to and the same bore of paraphase hole (20), promptly slightly less than the circular hole of phase-reversing tube bore, the two guard is identical, and woofer hole (21) symmetry is located at the left and right two ends of lower gear panel (2), occupies between said two devices and the marginal branch fagging (12).
Loudspeaker can not established guard, but because the lower gear position is lower, near ground, embodiment is provided with dustproof guard, and is both attractive in appearance, can prevent that also foreign matter from falling into.Fig. 4 embodiment is a kind of detachable, audio amplifier cloth net cover structure synoptic diagram of cleaning, figure medium and low spectrum loudspeaker guard (8) and woofer guard inner ring (23) are all formed by plastic injection-moulded, the audio amplifier cloth (22) that the two therebetween is knitting and mutual wringing fit, but the two is again detachable, is beneficial to audio amplifier cloth (22) and cleans or change; Woofer hole (21) on woofer guard (8) and the lower gear panel (2) also is mutual wringing fit, can be firmly woofer guard (8) and inner ring (23) and audio amplifier cloth (22) assembly be extracted from woofer hole (21), tightness can not shake pine during with the high-decibel volume and be advisable yet.Embodiment high pitch loudspeaker guard, paraphase hole net cover structure are identical with the woofer net cover structure.
Claims (10)
1. pianotron loudspeaker box device, comprise speaker hole, loudspeaker, guard, paraphase hole, breviseptum, long dividing plate, the lower gear panel, the lower gear header board, plate behind the lower gear, cover plate, the pedal group, intermediate support plate, marginal branch fagging and qin pin, about two groups of qin pin connect the bottom surface of piano key board casees, and be connected with lower cross plate, it is characterized in that by three block length bar sheet material lower gear header boards, the long recess body that plate is spliced into behind lower gear panel and the lower gear, the lower gear panel is the groove base, plate is both sides behind lower gear header board and the lower gear, two end regions at the groove body are respectively established the marginal branch fagging, respectively with the lower gear header board, plate connects behind lower gear panel and the lower gear, the middle part of groove body establish two intermediate support plates respectively with the lower gear header board, plate connects behind lower gear panel and the lower gear, connecting pin pedal group between two intermediate support plates, two cover plates difference closed recess body the right and left is set by the marginal branch fagging, the space that intermediate support plate and groove body constitute, forming two is centrosymmetric audio amplifier cavity with the pedal group.
2. a kind of pianotron loudspeaker box device according to claim 1 is characterized in that the two ends of lower gear panel are arranged with speaker hole, and the speaker hole in two audio amplifier cavitys on the corresponding lower gear panel is provided with loudspeaker respectively.
3. a kind of pianotron loudspeaker box device according to claim 1 and 2 is characterized in that the left and right paraphase hole that is arranged with of lower gear panel.
4. according to claim 1 or 2 or 3 described a kind of pianotron loudspeaker box devices, it is characterized in that breviseptum and long dividing plate are partitioned into a phase-reversing tube in each audio amplifier cavity, paraphase hole is communicated with through phase-reversing tube and audio amplifier cavity.
5. according to claim 1 or 2 or 4 described a kind of pianotron loudspeaker box devices, it is characterized in that the left and right symmetry of lower gear panel upper surface establishes the guard that connects speaker hole or paraphase hole.
6. according to claim 1 or 2 or 5 described a kind of pianotron loudspeaker box devices, the lower gear header board that it is characterized in that connecting the lower gear panel is low, plate hight behind the lower gear, the lower gear panel is horizontal by certain inclination angle, inclination angle scope 0-45 °, be arranged on loudspeaker axle center and surface level out of plumb in the audio amplifier cavity.
7. according to claim 1 or 2 or 6 described a kind of pianotron loudspeaker box devices, it is characterized in that two audio amplifier cavitys are positioned at the below of lower cross plate, the marginal branch fagging that constitutes the audio amplifier cavity is connected with the qin pin.
8. a kind of pianotron loudspeaker box device according to claim 1 is characterized in that described audio amplifier cavity is made of the lower gear of pianotron installation foot pedal group and the cover plate of increase.
9. a kind of pianotron loudspeaker box device according to claim 1 is characterized in that described audio amplifier inside cavity is provided with the acoustical cotton material.
10. according to claim 1 or 2 or 3 described a kind of pianotron loudspeaker box devices, it is characterized in that the guard of described speaker hole and paraphase hole can be provided with separately or be wholely set; The guard of described speaker hole and paraphase hole replaces with knitting guard or metal or plastics guard; Described guard is arranged to fixed or detachable.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110045278 CN102157143A (en) | 2011-02-25 | 2011-02-25 | Electronic piano sound box device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110045278 CN102157143A (en) | 2011-02-25 | 2011-02-25 | Electronic piano sound box device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102157143A true CN102157143A (en) | 2011-08-17 |
Family
ID=44438612
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201110045278 Pending CN102157143A (en) | 2011-02-25 | 2011-02-25 | Electronic piano sound box device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102157143A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016033860A1 (en) * | 2014-09-01 | 2016-03-10 | 歌尔声学股份有限公司 | Speaker module |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB346536A (en) * | 1929-07-08 | 1931-04-16 | Wilhelm Zoephel | Improvements in or relating to pianos, piano players and like musical instruments |
| CN2150694Y (en) * | 1993-03-01 | 1993-12-22 | 胡虎林 | Energy-storage type phase inverting sound box |
| JPH09106278A (en) * | 1995-10-06 | 1997-04-22 | Kawai Musical Instr Mfg Co Ltd | Loudspeaker of electronic piano |
| CN2790082Y (en) * | 2005-05-06 | 2006-06-21 | 贺惠梅 | Compound loudspeaker box |
| JP2007096690A (en) * | 2005-09-28 | 2007-04-12 | Kawai Musical Instr Mfg Co Ltd | Apparatus for producing musical sound |
| CN202009484U (en) * | 2011-02-25 | 2011-10-12 | 马季平 | Sound box device for electronic musical instrument |
-
2011
- 2011-02-25 CN CN 201110045278 patent/CN102157143A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB346536A (en) * | 1929-07-08 | 1931-04-16 | Wilhelm Zoephel | Improvements in or relating to pianos, piano players and like musical instruments |
| CN2150694Y (en) * | 1993-03-01 | 1993-12-22 | 胡虎林 | Energy-storage type phase inverting sound box |
| JPH09106278A (en) * | 1995-10-06 | 1997-04-22 | Kawai Musical Instr Mfg Co Ltd | Loudspeaker of electronic piano |
| CN2790082Y (en) * | 2005-05-06 | 2006-06-21 | 贺惠梅 | Compound loudspeaker box |
| JP2007096690A (en) * | 2005-09-28 | 2007-04-12 | Kawai Musical Instr Mfg Co Ltd | Apparatus for producing musical sound |
| CN202009484U (en) * | 2011-02-25 | 2011-10-12 | 马季平 | Sound box device for electronic musical instrument |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016033860A1 (en) * | 2014-09-01 | 2016-03-10 | 歌尔声学股份有限公司 | Speaker module |
| US10158937B2 (en) | 2014-09-01 | 2018-12-18 | Goertek Inc. | Speaker module |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103220608B (en) | Speaker module | |
| CN105491474A (en) | Display device and electric device comprising same | |
| CN203984643U (en) | Passive radiator | |
| US9154863B2 (en) | Speaker enclosure and method for eliminating standing waves therein | |
| CN215166736U (en) | Porous ceramic acoustic board | |
| CN202009484U (en) | Sound box device for electronic musical instrument | |
| CN102157143A (en) | Electronic piano sound box device | |
| US8085968B2 (en) | Resonating cone transducer | |
| CN204669586U (en) | Resonance speaker | |
| CN204669583U (en) | Double horn Portable resonant sound box | |
| CN103024628B (en) | Mechanical frequency division voice box | |
| CN202043276U (en) | Combined non-directional broadband planar speaker | |
| CN206577396U (en) | Speaker unit | |
| CN206061097U (en) | Sound box and high sound quality sound box | |
| CN202435591U (en) | Integrated sound box | |
| CN207135237U (en) | A kind of Multicarity audio amplifier | |
| CN202841503U (en) | Fat plane loudspeaker | |
| CN207124717U (en) | A kind of two-sided extrusion formula passive sound box | |
| CN202406287U (en) | Ultrathin sound box | |
| CN206433107U (en) | The articulatory configuration and audio amplifier of a kind of audio amplifier | |
| US8180086B2 (en) | Speaker | |
| CN201805536U (en) | Super-bass sound box for English-reading | |
| CN208623859U (en) | A kind of independent sound equipment with stereo sound effect | |
| CN218587325U (en) | Sound cavity assembly of large projector | |
| JPS6329356Y2 (en) |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20110817 |