CN1672457A - Sound transducer comprising a small rear volume chamber - Google Patents
Sound transducer comprising a small rear volume chamber Download PDFInfo
- Publication number
- CN1672457A CN1672457A CN 03817973 CN03817973A CN1672457A CN 1672457 A CN1672457 A CN 1672457A CN 03817973 CN03817973 CN 03817973 CN 03817973 A CN03817973 A CN 03817973A CN 1672457 A CN1672457 A CN 1672457A
- Authority
- CN
- China
- Prior art keywords
- diaphragm
- converter
- rear volume
- acoustic transformer
- volume
- 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
- 230000005540 biological transmission Effects 0.000 claims abstract description 11
- 239000012528 membrane Substances 0.000 claims abstract description 11
- 238000004891 communication Methods 0.000 claims description 19
- 238000007789 sealing Methods 0.000 claims description 10
- 238000005452 bending Methods 0.000 claims description 5
- 230000003068 static effect Effects 0.000 claims description 2
- 239000012080 ambient air Substances 0.000 claims 1
- 238000005516 engineering process Methods 0.000 description 6
- 239000000463 material Substances 0.000 description 3
- 230000035945 sensitivity Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000033001 locomotion Effects 0.000 description 2
- 238000012536 packaging technology Methods 0.000 description 2
- 229920000742 Cotton Polymers 0.000 description 1
- 241000255925 Diptera Species 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000002788 crimping Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000000116 mitigating effect Effects 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/02—Constructional features of telephone sets
- H04M1/03—Constructional features of telephone transmitters or receivers, e.g. telephone hand-sets
- H04M1/035—Improving the acoustic characteristics by means of constructional features of the housing, e.g. ribs, walls, resonating chambers or cavities
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K13/00—Cones, diaphragms, or the like, for emitting or receiving sound in general
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K9/00—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers
- G10K9/12—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers electrically operated
- G10K9/13—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers electrically operated using electromagnetic driving means
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
- H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only
- H04R1/225—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only for telephonic receivers
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Multimedia (AREA)
- Health & Medical Sciences (AREA)
- Otolaryngology (AREA)
- Electromagnetism (AREA)
- Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
- Diaphragms For Electromechanical Transducers (AREA)
- Obtaining Desirable Characteristics In Audible-Bandwidth Transducers (AREA)
- Details Of Audible-Bandwidth Transducers (AREA)
Abstract
The electroacoustic transducer has a mechanical transducer structure with an oscillating membrane and a relatively small enclosed rear volume acting as a functional part of the transducer, the ratio between the membrane mass and the rear volume selected for ensuring that a given lower limit for the required transmission range is attained. The spring rigidity of the membrane is below the spring rigidity of the enclosed rear volume, the membrane having a greater rigidity in its centre than in the surrounding outer area.
Description
The present invention relates to a kind of playback acoustic transformer that is used for communication terminal device.
In a kind of communication terminal device, the playback acoustic transformer is used to answer, raise one's voice answer/hands-free and be used to send semiotic function.
The known scheme that is used to solve this task has been used special converter respectively: earphone, ringer and hand-free loudspeaker (standard scheme).Known in addition this task of solution has been used conventional communication scaling device, and this converter satisfies the requirement of a plurality of functions simultaneously.
Just can be used above-mentioned two kinds of known solutions conditionally by greatly microminiaturized communication terminal device now.
The microminiaturized prerequisite of communication terminal device (especially for radio telephone and mobile phone) is to reduce component count and microminiaturized each single component.If also consider manufacturing cost, it is more important to reduce component count.Therefore, ringer and earphone (function that all needs in each communication terminal device), hands-free and raising one's voice of amusement function (for example: broadcast receiver are answered, the MP3 player) combination is an important dimension criteria and cost standard, thereby the how special converter of use is uneconomic.
In order to satisfy all requirements, mentioned function combinations is required a back volume (Rueckvolume) big relatively, sealing in the acoustic transformer of a known technology.The back volume that is closed can be understood as the volume in the converter back, and the inflation of this volume is dwindled by dynamic motion of membrane and expanded, and at this, air does not leak out from housing or be harmonious with the air movement before diaphragm.If converter-back volume is formed by an air chamber in the communication terminal device housing, so, volume does not have or has just realized with limitation after the big sealing.At first, because the required shell nozzle (sleeve, battery cover board) of multiple arrangement and do not take the common housing technologies of complicated addition thereto not realize sufficient air-tightness usually.In addition, existing non-tight performance is because the mechanical tolerance of packaging technology all is different for each communication terminal device almost.At last, the microminiaturization of communication terminal device causes the air chamber that keeps between the assembly greatly to reduce.Therefore, required big, the airtight back volume of Chang Gui communication scaling device can not adapt to the packaging technology of modern communications terminal equipment.
Therefore, task of the present invention is only to realize multi-functional (earphone, ringer, hand-free loudspeaker) with an acoustic transformer.At this, in such housing form, realize integratedly, it is little, unencapsulated or can use with regard to seal aspect volume unqualified, that be positioned at the converter back that these housing forms have only.
According to the present invention, this task solves by means of a kind of acoustic transformer, this acoustic transformer is characterised in that, its mechanical transformer configuration have one with converter proportional, little with the sealing rear volume chamber (R ü ckvolumcnkammer), this rear volume chamber is the significant components of the function of acoustic transformer, wherein selective membrane tablet quality and the back proportionate relationship between the volume makes it to realize the predetermined lower bound of the transmission band of an expectation, and wherein the rigidity of diaphragm clamping is lower, makes this rigidity be significantly less than the rigidity of the back volume of closing.
Conventional known transducer is not considered design and is coordinated purpose-assembling-back volume.When converter was coupled to the volume of air that exists in the housing of communication terminal device, acoustic characteristic had greatly been changed, and particularly the lower frequency limit of transmission band has been enhanced.In addition, the unsettled sealing property of volume afterwards that is caused by common housing technologies produces not desired frequency characteristic variations.
Required stabilized frequency characteristic is fixedly attached troops to a unit in the rear volume chamber generation of converter by one in according to converter of the present invention.In similar structure technology, the volume of air that wherein comprises is less than existing air chamber volume sum in communication terminal device.When using conventional converter technology, the lower frequency limit of the transmission band that causes thus raises in a unacceptable scope.
In contrast, design its physical dimension according to converter of the present invention and be used for back volume stable coupling, little.Suitable tuning prerequisite right and wrong improve diaphragm quality routinely, and greatly reduce the rigidity (referring to the 4th page, the 24th row) that diaphragm clamps.Finally, the air-rigidity that causes the back volume of the installation effect of not expecting in known technology becomes the chief component according to quality elastic system in the converter of the present invention.The diaphragm that plays a major role in the converter of routine clamps rigidity and has been substituted by the air-rigidity of the little converter that plays a major role-back volume in according to converter of the present invention.
Other suitable structure of the present invention and physical background of the present invention are drawn by dependent claims and following explanation and embodiment by accompanying drawing to prior art.
Shown in the accompanying drawing:
Fig. 1 be an acoustic transformer known in the prior art schematic cross section and
Fig. 2 is a schematic cross section according to the acoustic transformer of the present invention's structure.
The sensitivity of a playback acoustic transformer (sound intensity of the sound of radiation is with respect to supplying with electrical power) the mainly volume vibration velocity by diaphragm determines.In order to realize a higher sensitivity, big as far as possible diaphragm portion must be moved with high as far as possible amplitude.
Conventional DYN dynamic miniature converter (for example being used for communication terminal device) is used as diaphragm material with the film of a deep drawn, and this film flexibly is shaped on central area bending resistance ground (for example segment) and edge region by its profile.
The conventional converter of a this form schematically illustrates in Fig. 1.Described diaphragm 1,2 is made of zone 1 and a flexible clamping region 2 of a bending resistance.Herein, diaphragm clamps the architectural characteristic in the zone 2 that is interpreted as diaphragm 1,2, and its form with a spring function produces the reset force towards the diaphragm original position.
Dynamically move by a solenoid 3 and a permanent magnet in bending resistance zone 1 in the centre.The amplitude of diaphragm skew reduces in Hookean region 2 gradually along with becoming big diameter.Thus, as above-mentionedly have diaphragm that the radial deflection amount reduces gradually when carrying out identical volume vibration velocity, estimate an effective diaphragm area.
Raise one's voice answer and send the required sound pressure level regulation of semiotic function diaphragm a minimum rigidity to avoid harmonic wave (glitch-free sound reproduction).If expect that transmission frequency zone limit inferior is lower, the rigidity that diaphragm clamps must be lower and diaphragm 1,2 therefore integral type use wide band for strain.Thus, have only relatively little diaphragm portion with complete magnitude shift, this causes membrane surface efficient not high.
When given frequency, the volume vibration velocity of diaphragm 1,2 depends on the operation amplitude except effective membrane surface.This amplitude is proportional and inversely proportional with the quality of diaphragm with the rigidity that clamps again.Therefore conventional miniature converter uses light as far as possible diaphragm 1,2 in order to realize bigger operation amplitude, and this diaphragm drives by light coil 3.
Only when the sound upward pressure on the diaphragm front side can not disappear with produced simultaneously sound downforce (acoustic short circuit) on the diaphragm rear side, sound just can be launched.Do not change under the situation of downconverter one resonance frequency, this situation can only have in large-sized acoustic screen with respect to wave length of sound and to realize by being installed to one.Because this situation is impossible for relevant terminal equipment, people must be installed in converter in the housing of a closure for fear of acoustic short circuit.
But, the characteristic changing of this housing the acoustic characteristic of converter.Particularly the volume of air of closing later at converter is applied on the diaphragm as additional rigidity.For the lower limit that makes transmission frequency characteristic does not raise significantly, conventional miniature converter needs a little volume of air rigidity and a big back volume 4.The effect of terminal equipment overall dimension is that big back volume 4 is with good conditionsi and can not realizes with a chest that is converter keeps.In fact, in device, have only the air chamber (space of antenna integrated, close electronic unit) that under any circumstance keeps to use.
If the volume of air of closing of back volume 4 is dispersed into little chamber or local unsealing (if any indeterminate part, referring to the leakage hole among Fig. 1 5), consequence is to produce uncontrollable resonance and vibration in the transmission frequency characteristic of sound.This situation not only appears to raise one's voice and answers or in the ringer pattern, and also appears in the headset mode in the communication scaling device.
But field of telecommunications has been formulated the acoustic characteristic of installing with the form of standard, has particularly formulated the acoustic characteristic (sound intensity, frequency characteristic or the like) of headset mode in detail.Because this reason, the communication scaling device with above-mentioned characteristic is not used in modern communication terminal device or is very restricted.
Next an example according to acoustic transformer of the present invention is described, it schematically illustrates in Fig. 2.
The structure of acoustic transformer is characterised in that, realizes a kind of tuning (Abstimmung) by a special converter principle, although the little sound reproduction that can realize the broadband of back volume.
Converter is tuning to be characterised in that, can realize a following resonance frequency in the time of in converter being integrated into a common back volume, and this resonance frequency is positioned on the bottom of the actual transmission frequency characteristic lower limit of the striving for position far away.In case the back volume 8 of little sealing is used the converter rear side, promptly produces the lower limit of desired transmission frequency characteristic.
This can the very soft and very high realization of diaphragm quality by the suspension that makes diaphragm 5,6.
Soft diaphragm hangs and for example realizes by a split type diaphragm.As in the big woofer of recreational electronic equipment, evenly the interior diaphragm surface 5 that drives has used the material (cardboard, plastics) and the outer crimping 6 of a special bending resistance to use soft especially material such as rubber or silicones.Thus, Hookean region (radially always being offset) is reduced on the narrow edge and therefore effective membrane surface is maximized lessly.Mainly improved the sensitivity of converter by big effective membrane surface.
In addition, this structure make diaphragm quality realize desired raising.But, reduced portion convertor-sensitivity again by improving diaphragm quality.In addition, this and not existing together of traditional miniature converter are come balance by big coil 7 and magnet system.Big coil is used for further improving diaphragm quality.Another scheme, a soft diaphragm hangs (having bigger effective diaphragm area) and realizes by diaphragm structure multilayer or that greatly be stretched at the edge.
In according to acoustic transformer of the present invention, used the transformer configuration of a machinery, this structure tuning mainly by one little, sealing, determine in the rigidity of the volume of air 8 of converter rear side.
Compare with conventional art the less back volume 8 of overall dimension can use a sealing, special configuration is in the rear volume chamber of converter.In order to prevent acoustic short circuit, the back volume that has been coupled must be sealed as much as possible.In addition, suitably adopt and have or do not have opening (hole, slit, pipeline, conduit or analog) tuning on the impact mitigation measure acoustics (fluid (Fliess), cotton, mechanical constriction device), little not only can carry out static pressure compensation (outer＜-interior) but also additionally influence frequency characteristic and distortion.Therefore a little acoustic module occurred, it has realized stable frequency characteristics, and this frequency characteristic has the lower limit of low transmission band, and does not claim on the structure of device volume and sealing.
Therefore, have the following advantages according to acoustic transformer of the present invention:
* by using a communication scaling device to save expense and volume
* by using one to save volume with the proportional rear volume little, sealing of converter
* attach troops to a unit in the rear volume chamber of converter by one, with regard to assembling condition, do not have size to want Ask (in order to realize controllable frequency characteristic).
Claims (4)
1. the acoustic transformer that is used for communication terminal device, it is characterized in that one have one with the converter mechanical converter structure of rear volume chamber proportional, little, sealing, this rear volume chamber is the significant components of the function of acoustic transformer, wherein thereby selective membrane tablet quality and the back proportionate relationship between the volume can realize the predetermined lower bound of a desired transmission band, and wherein the rigidity that clamps of diaphragm is low makes it be significantly less than the back volume rigidity of closing.
2. by the acoustic transformer of claim 1, it is characterized by, the diaphragm of loud speaker is made of interior zone and narrow, a very soft perimeter that surrounds this interior zone of a big bending resistance.
3. by claim 1 or 2 acoustic transformer, it is characterized by, rear volume chamber is a module of independently, fixedlying connected with acoustic transformer.
4. by claim 1,2 or 3 acoustic transformer, it is characterized by, rear volume chamber is by the opening that is used for the static pressure compensation suitable on the acoustics, and links to each other with ambient air for the acoustic characteristic that influences loud speaker.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10234169.9 | 2002-07-26 | ||
| DE10234169 | 2002-07-26 | ||
| DE10328380A DE10328380A1 (en) | 2002-07-26 | 2003-06-24 | Electroacoustic transducer for communications terminal has relatively small enclosed rear volume for allowing increased miniaturization |
| DE10328380.3 | 2003-06-24 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1672457A true CN1672457A (en) | 2005-09-21 |
Family
ID=31889083
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03817973 Pending CN1672457A (en) | 2002-07-26 | 2003-07-15 | Sound transducer comprising a small rear volume chamber |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP1525774A1 (en) |
| JP (1) | JP2005534266A (en) |
| KR (1) | KR20050030212A (en) |
| CN (1) | CN1672457A (en) |
| WO (1) | WO2004017672A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102006058369B4 (en) | 2006-12-08 | 2014-01-23 | Sennheiser Electronic Gmbh & Co. Kg | Electroacoustic transducer |
| US20180139540A1 (en) | 2015-04-30 | 2018-05-17 | Ole Wolff Elektronik A/S | Deep-drawn foil-based miniature diaphragm assembly |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2714134A (en) * | 1951-02-27 | 1955-07-26 | Martin L Touger | Headset receiver |
| US3324966A (en) * | 1966-10-12 | 1967-06-13 | Stephen L Heidrich | Electro-acoustic transducers |
| US3555206A (en) * | 1967-09-15 | 1971-01-12 | Astatic Corp | Microphone diaphragm assembly |
| JPS58166897A (en) * | 1982-03-26 | 1983-10-03 | Matsushita Electric Ind Co Ltd | Receiver |
| NO169210C (en) * | 1989-07-06 | 1992-05-20 | Nha As | ELECTRODYNAMIC AUDIO FOR HEARING DEVICE. |
| US5729605A (en) * | 1995-06-19 | 1998-03-17 | Plantronics, Inc. | Headset with user adjustable frequency response |
-
2003
- 2003-07-15 EP EP03787671A patent/EP1525774A1/en not_active Withdrawn
- 2003-07-15 WO PCT/DE2003/002382 patent/WO2004017672A1/en not_active Application Discontinuation
- 2003-07-15 CN CN 03817973 patent/CN1672457A/en active Pending
- 2003-07-15 KR KR1020057001353A patent/KR20050030212A/en not_active Application Discontinuation
- 2003-07-15 JP JP2004528378A patent/JP2005534266A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| WO2004017672A1 (en) | 2004-02-26 |
| KR20050030212A (en) | 2005-03-29 |
| JP2005534266A (en) | 2005-11-10 |
| EP1525774A1 (en) | 2005-04-27 |
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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 |