CN1083300A - The temperature compensation of the sound pressure characteristic of electroacoustic transducer - Google Patents

The temperature compensation of the sound pressure characteristic of electroacoustic transducer Download PDF

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CN1083300A
CN1083300A CN 93107429 CN93107429A CN1083300A CN 1083300 A CN1083300 A CN 1083300A CN 93107429 CN93107429 CN 93107429 CN 93107429 A CN93107429 A CN 93107429A CN 1083300 A CN1083300 A CN 1083300A
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mentioned
resonance frequency
oscillating plate
temperature
sound pressure
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CN1038095C (en
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铃木和词
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Star Micronics Co Ltd
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Star Micronics Co Ltd
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    • 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
    • G10K9/18—Details, e.g. bulbs, pumps, pistons, switches or casings

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  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
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  • Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
  • Obtaining Desirable Characteristics In Audible-Bandwidth Transducers (AREA)

Abstract

The present invention utilizes resonance frequency f o, f vWith the variation of temperature tendency, provide a kind of temperature compensation of sound pressure characteristic of electroacoustic transducer, to compensate sound pressure characteristic with variation of temperature.The temperature compensation of the sound pressure characteristic of electroacoustic transducer of the present invention is the resonance frequency (f with resonant chamber v) set less than the resonance frequency (f of oscillating plate o) (f o＞f v).Promptly, by the resonance frequency of resonant chamber being set less than the resonance frequency of oscillating plate, can improve the magnetic actuating force of above-mentioned drive source during high temperature, the compensation acoustic pressure reduces, can reduce the magnetic actuating force of above-mentioned drive source during low temperature, suppress acoustic pressure and rise, thereby can compensate sound pressure characteristic with variation of temperature.

Description

The temperature compensation of the sound pressure characteristic of electroacoustic transducer
The present invention relates to award the temperature compensation of the sound pressure characteristic of the electroacoustic transducer that mixer uses as buzzer that with converting electrical signal is sound equipment etc.
Electroacoustic transducer is to be converting electrical signal the electricity-acoustic transducer of sound equipment.This electroacoustic transducer can obtain and the output of the sound equipment of input electrical signal correspondence, so, can be used as buzzer etc. and award mixer and be used for equipment such as electronic instrument.In addition, this electroacoustic transducer has by structure and sound pressure characteristic that material determined, but this sound pressure characteristic is subjected to Temperature Influence, and variations in temperature is influential to sound equipment output.
Before, in drive source, use the electromagnetic type electroacoustic transducer of solenoid, for example shown in the image pattern 6 like that, at the inwall of the cylindrical circular shell 2 that forms by synthetic resin, a plurality of fins 3 are set vertically, are provided with the oscillating plate vertical 4 with the central shaft of shell 2 at the downside of this fin 3.In the front of this oscillating plate 4, be provided with resonant chamber 6, at its back side, be provided with and make oscillating plate 4 vibrative drive sources 8.In resonant chamber, on the inaccessible wall of the shell 2 parallel, form and be louver 10 cylindraceous with oscillating plate 4.This louver 10 is formed by the interior side-prominent cylinder to resonant chamber 6, and to extraneous atmosphere opening, the sound equipment that resonant chamber 6 obtains when being used for oscillating plate 4 vibrations is emitted to the outside with resonant chamber 6.
Drive source 8 is to make oscillating plate 4 produce the device of sound vibration, receives the outside drive current of supplying with by terminal 12,14, produces alternating magnetic field, and under the effect of this alternating magnetic field, oscillating plate 4 produces sound vibration.Oscillating plate 4 usefulness by these drive source 8 excitings can form by magnetized metal sheet, and magnetic piece in the form of annular discs 16 is equipped with at the position in the central.Because oscillating plate 4 is metal sheets, so this magnetic piece 16 is the quality that are used for increasing oscillating plate 4, at this moment, in order to constitute magnetic circuit together, so form with magnetic material with oscillating plate 4.In addition, oscillating plate 4 be fixed on be installed on shell 2 inside be magnet 18 cylindraceous above, its edge is magnetized state.That is, oscillating plate 4 is subjected to the magneticaction of magnet 18 and magnetizes, and is fixed under attraction force acts.In addition, magnet 18 is securely fixed in the inside of shell 2 by the base 20 that is closed by the back side with shell 2 that can magnetized metal forms.And, fixing the substrate 22 that terminal 12,14 is set at the back side of this base 20, at the central part of this substrate 22 and base 20, on the central shaft of magnet 18, be provided with unshakable in one's determination 24.Iron core 24 is cylindric, between its end face and oscillating plate 4, forms space 26, and this space 26 is to allow the space of carrying out magnetic coupling and vibration.On unshakable in one's determination 24, be wound with coil 30 by coil rack 28, terminal 12,14 is connected with coil 30, by terminal 12,14 input drive currents, as vibrative input current.
In this acoustic converter, sound pressure characteristic is structurally mainly by oscillating plate 4 and resonant chamber 6 decisions.The natural reonant frequency of oscillating plate 4 is f o, the fixedly resonance frequency of resonant chamber 6 is f vResonance frequency f oBy the size of the backside space 32 of the magnetic force of the size in the shape of the material of oscillating plate 4 and shape, magnetic piece 16 and quality, space 26, magnet 18, oscillating plate 4, many physical factor decisions such as diameter of unshakable in one's determination 24.Resonance frequency f vDetermine by following formula.Promptly
f v = CD 4 1/πV(L+0.75D)
（1）
This (1) formula is Helmholtz's relational expression.V is the volume of resonant chamber, and D is the diameter of louver 10, and L is the length of louver 10, and C is the velocity of sound (about 344000mm/sec).Therefore, resonance frequency f vDetermine by the diameter of louver 10 and the volume V of length and resonant chamber 6 thereof.But, if make the diameter of louver 10 and length certain, resonance frequency f then vJust the volume V that only is decided by resonant chamber 6.
In addition, in this electroacoustic transducer, in the past, as strengthening resonance frequency f oThe countermeasure of acoustic pressure, taked two kinds of methods, as shown in Figure 7 a kind of, with resonance frequency f vBe set at resonance frequency f o2 times of (f v=2f o), another kind is the frequency band for the broadening sound pressure characteristic, as shown in Figure 8, and with resonance frequency f vSet a little more than resonance frequency f o(f v＞f o).For preceding a kind of method, regeneration frequency f wAdopt resonance frequency f o, for second method, regeneration frequency f wBe set in f o～f vScope in.
Yet the sound pressure characteristic of this electroacoustic transducer is very big with variation of temperature, the main cause of characteristic variations have following some:
A. because the critical component of drive source 8 is coil 30 usefulness copper cash etc. turns to, so internal resistance increases during high temperature, electric current is reduced, the field weakening that electric current produces causes the actuating force of oscillating plate 4 to reduce.During low temperature, situation of change is opposite.
B. during high temperature because and change around the overall dimension that the iron core 24 of coil 30 has the magnet 18 of magnetic coupling relation, so, the space 26 that constitutes the part of magnetic circuit increases, magnetic efficiency is reduced, and when particularly using plastic magnet as magnet 18, the reduction of magnetic efficiency is more remarkable.During low temperature, situation is opposite, and magnetic efficiency increases.
E. the magnetic force of magnet 18 has the tendency of reduction when high temperature, and the tendency of increase is arranged when low temperature.
Therefore, during high temperature, resonance frequency f oReduce; During low temperature, the reason owing to high temperature the time is opposite, resonance frequency f oRise.
In addition, for resonance frequency f v, owing to the shape and size of shell 2 change with temperature, so, resonance frequency f vAlso have the characteristic that changes with temperature, that is, rise during high temperature, descend during low temperature.
For frequency setting (f shown in Figure 7 v=2f o), this resonance frequency f o, f vWith variation of temperature as shown in Figure 9, (T during high temperature H=85 ℃), normal temperature (T s=25 ℃) time resonance frequency f oMove to f OH(＜f o), the resonance frequency f during normal temperature vMove to f VH(＞f v).At this moment, the frequency interval f during normal temperature OvExpand as f OVH(＞f Ov), simultaneously, and since above-mentioned a, the main cause of b and c, and acoustic pressure significantly reduces.In addition, (T during low temperature L=-40 ℃), the resonance frequency f during normal temperature oMove to f OL(＞f o), the resonance frequency f during normal temperature vMove to f VL(＜f v).At this moment, the frequency interval f during normal temperature OVBe reduced into f OVL(＜f Ov), simultaneously, acoustic pressure significantly rises.At this moment, regeneration frequency f wAcoustic pressure the above significant sound pressure variations of 10dB takes place, thereby, can not obtain necessity and enough sound equipment output sometimes.
In addition, same under the situation of frequency setting shown in Figure 8, resonance frequency f o, f vVary with temperature as shown in figure 10 (T during high temperature H=85 ℃), the resonance frequency f during normal temperature oMove to f OH(＜f o), normal temperature (T s=25 ℃) time resonance frequency f vMove to f VH(＞f v).So, frequency interval f OvExpand as f OVH(＞f Ov), acoustic pressure significantly reduces.In addition, (T during low temperature L=-40 ℃), the resonance frequency f during normal temperature oMove to f OL(＞f o), the resonance frequency f during normal temperature vMove to f VL(＜f v).So, the frequency interval f during normal temperature OVBe reduced into f OVL(＜f Ov), simultaneously, acoustic pressure significantly rises.At this moment, regeneration frequency f wAcoustic pressure the above significant sound pressure variations of 10dB equally also takes place.
Figure 11 shows the sound pressure characteristic of the electroacoustic transducer that has earlier, T s, T H, T LSound pressure characteristic when being 25 ℃, 85 ℃ ,-40 ℃ respectively.In addition, Figure 12 is the coil current characteristic under these situations, T s, T H, T LCharacteristic when being 25 ℃, 85 ℃ ,-40 ℃ respectively.At this moment, at regeneration frequency f w(under the 2KHz～3KHz), the acoustic pressure change is about 10dB during the variations in temperature of-40 ℃ and 85 ℃.
Like this, the acoustic converter that has earlier, owing to sound pressure characteristic changes with temperature, so, acoustically can feel to change with environment for use and changes of seasons.
Therefore, the objective of the invention is to utilize this resonance frequency f o, f vTemperature variant tendency provides a kind of temperature compensation that can compensate the sound pressure characteristic of the temperature variant electroacoustic transducer of sound pressure characteristic.
In addition, another object of the present invention is the basic structure of the electroacoustic transducer that has earlier not to be done too cataclysm and compensated sound pressure characteristic with variation of temperature.
Promptly, the compensation method of the variations in temperature of electroacoustic transducer of the present invention is, the oscillating plate setting in the enclosure, resonant chamber is set in the front of this oscillating plate, drive source is set at its back side, make above-mentioned oscillating plate that vibration take place and by in the electroacoustic transducer of above-mentioned resonant chamber with the outside playback of chatter of this oscillating plate, by this drive source with the resonance frequency (f of above-mentioned resonant chamber v) be provided with less than the resonance frequency (f of above-mentioned oscillating plate o) (f o＞f v).
Therefore, in the present invention, the resonance frequency f of oscillating plate oResonance frequency f with resonant chamber vMagnitude relationship (f o＞f v) be that benchmark is set during with normal temperature.In addition, resonance frequency f vThe tendency that rises, reduces during low temperature is arranged when high temperature, and resonance frequency f oThe tendency that reduces, rises during low temperature is arranged when high temperature.And because the reducing of magnetic actuating force, acoustic pressure has the tendency of reduction during high temperature, because the increase of magnetic actuating force, acoustic pressure has the tendency of rising during low temperature.If the relation that increases and decreases with variation of temperature according to this resonance frequency and acoustic pressure is with resonance frequency f vSet less than resonance frequency f oThough then frequency interval narrows down during high temperature, acoustic pressure owing to the magnetic actuating force reduce reduce,, the reduction part of this acoustic pressure and narrow down and the acoustic pressure partial enhanced that causes is cancelled out each other by frequency interval, thus can compensate the reduction of acoustic pressure.In addition, though frequency interval broadens during low temperature, acoustic pressure is owing to the enhancing of magnetic actuating force is risen,, the part that this acoustic pressure rises and broaden and the acoustic pressure that causes reduces part and cancels out each other by frequency interval, thus can compensate the rising of acoustic pressure.Promptly, it is opposite with situation about having earlier that tendency is dwindled in the expansion at the interval of resonance frequency, the sound pressure variations that causes by the variation of frequency interval and cancel out each other by the sound pressure variations that the increase and decrease of magnetic actuating force causes, so, can compensates, thus can obtain to vary with temperature little sound pressure characteristic to the degree of can ignoring.
Below, describe the present invention in detail with reference to illustrated embodiment.
Fig. 1 is an embodiment of the sound pressure characteristic temperature compensation of electroacoustic transducer of the present invention.
Fig. 2 is the sectional arrangement drawing of electroacoustic transducer, and this electroacoustic transducer is the specific embodiment of the sound pressure characteristic temperature compensation of electroacoustic transducer of the present invention shown in Figure 1.
Fig. 3 is the size profile relatively of electroacoustic transducer shown in Figure 2 and the electroacoustic transducer that has earlier.
Fig. 4 is the sound pressure characteristic that is obtained by electroacoustic transducer shown in Figure 2.
Fig. 5 is the coil current characteristic that is obtained by electroacoustic transducer shown in Figure 2.
Fig. 6 is the sectional arrangement drawing of the structure of the electroacoustic transducer that has earlier.
Fig. 7 is the sound pressure characteristic of the electroacoustic transducer that has earlier.
Fig. 8 is the sound pressure characteristic of the electroacoustic transducer that has earlier.
Fig. 9 is that the sound pressure characteristic of the electroacoustic transducer that has earlier is with variation of temperature.
Figure 10 is that the sound pressure characteristic of the electroacoustic transducer that has earlier is with variation of temperature.
Figure 11 is the sound pressure characteristic that is obtained by the electroacoustic transducer that has earlier.
Figure 12 is the coil current characteristic that is obtained by the electroacoustic transducer that has earlier.
2-shell among the figure,
The 4-oscillating plate,
The 6-resonant chamber,
The 8-drive source,
f o-resonance frequency (oscillating plate)
f v-resonance frequency (resonant chamber)
Fig. 1 is an embodiment of the sound pressure characteristic temperature compensation of electroacoustic transducer of the present invention.There is intrinsic resonance frequency f in this electroacoustic transducer oWith resonance frequency f v, still,, their magnitude relationship is set at f as the temperature compensation of sound pressure characteristic o＞f vThat is, with the resonance frequency f of resonant chamber 6 vSet less than the resonance frequency f of oscillating plate 4 o
These two resonance frequency f o, f vMagnitude relationship set at normal temperatures, make that for example both magnitude relationship can be owing to variations in temperature takes a turn for the worse.That is, the present invention does not suppress each resonance frequency f o, f vOwn with variation of temperature, but according to each resonance frequency f o, f vWith the variation that temperature produces, promptly set the two value according to its change direction, and set each value when changing varying with temperature, even both values are close mutually, the magnitude relationship of both values can not take a turn for the worse and still have certain difference.Therefore, this resonance frequency f o, f vEstablishing method be the size of the backside space 32 of the size in the quality of the magnetic piece of using by the material of oscillating plate 4 and shape, as additional mass 16 and shape, space 26, the magnetic force of magnet 18, oscillating plate 4, many physical factor decision resonance frequency f such as diameter of unshakable in one's determination 24 o, utilize (1) formula decision resonance frequency f vParticularly, utilize the volume of resonant chamber 6 to adjust resonance frequency f vThat is the resonance frequency f of resonant chamber 6, vWith the volume of resonant chamber 6 much relations are arranged, so, resonance frequency f can be adjusted at an easy rate by the volume of adjusting resonant chamber 6 v
Like this, if with resonance frequency f v, f oMagnitude relationship be set at f o＞f v, resonance frequency f then v(=T when high temperature H) rise, become f VH(＞f v); (=T when low temperature L) descend, become f VL(＜f v).In addition, resonance frequency f oWhen high temperature, reduce, become f OH(＜f o), when low temperature, rise, become f OL(＞f o).Such relation, the characteristic that this exactly electroacoustic transducer has, resonance frequency f v, f oVariation as Fig. 9 and Figure 10 explanation, even with resonance frequency f v, f oBe set at f o＞f vRelation, same relation is also set up.
In addition, set f o＞f vThe time, if (=T during high temperature H) resonance frequency f vBecome f VH(＞f v), resonance frequency f oBecome f OH(＜f o), resonance frequency f then o, f vClose mutually, both frequency interval f OVHFrequency interval f when becoming less than normal temperature OV
At this moment, with reference to electroacoustic transducer shown in Figure 6, because above-mentioned a, b, the main cause of c, along with the reducing of magnetic actuating force, acoustic pressure will reduce during high temperature, still, along with resonance frequency f o, f vIncrease and decrease, both frequency intervals become f OVH, dwindle less than frequency interval f OV(f Ov＞f OVH), so, on characteristic, can strengthen acoustic pressure.In other words, dwindle the part that the acoustic pressure partial enhanced that causes and the acoustic pressure that is reduced to cause by the magnetic actuating force reduce by frequency interval and cancel out each other, so, can suppress to have earlier the significantly reduced situation of the sort of acoustic pressure.
In addition, if (=T during low temperature L) resonance frequency f vBecome f VL(＜f v), resonance frequency f oBecome f OL(＞f o), resonance frequency f then o, f vAlong with increase and decrease mutually away from, both frequency interval f OVLFrequency interval f when becoming greater than normal temperature Ov
At this moment, electroacoustic transducer shown in Figure 6 is because above-mentioned a, b, and the main cause of c, the magnetic actuating force strengthens, and the result rises acoustic pressure.Along with resonance frequency f o, f vIncrease and decrease, both frequency intervals become f OVL, become greater than frequency interval f Ov(f OV＜f OVL), so, acoustic pressure will be reduced.Enlarge the acoustic pressure reduction that causes by frequency interval and partly and by the acoustic pressure rising part that the enhancing of magnetic actuating force causes cancel out each other, so, the situation that has the sort of acoustic pressure significantly to rise earlier can be suppressed.
Like this, by resonance frequency is set at f o＞f v, can compensate acoustic pressure with variation of temperature, thereby can make the sound pressure characteristic that causes by temperature in the regeneration frequency scope change the negligible degree that is reduced to.
Fig. 2 is the electroacoustic transducer of the sound pressure characteristic temperature compensation specific embodiment of electroacoustic transducer of the present invention.This electroacoustic transducer has the structure identical with electroacoustic transducer shown in Figure 6, and identical part is marked with identical symbol.
This electroacoustic transducer is provided with a plurality of fins 3 at the inwall of the cylindrical circular shell 2 that is formed by synthetic resin, at the downside of this fin 3, oscillating plate 4 is set, and oscillating plate 4 is vertical with the central shaft of shell 2.In the front of this oscillating plate 4, resonant chamber 6 is set, be provided with at its back side and make oscillating plate 4 vibrative drive sources 8.In resonant chamber 6, on the inaccessible wall of the shell 2 parallel, form and be louver 10 cylindraceous with oscillating plate 4.This louver 10 is the playback parts that formed by the interior side-prominent cylinder to resonant chamber 6, makes resonant chamber 6 to extraneous atmosphere opening, and the sound equipment that resonant chamber 6 obtains is emitted to the outside.
Drive source 8 is to make oscillating plate 4 produce the parts of sound vibration, receives the outside driving power of supplying with by terminal 12,14, produces alternating magnetic field, under the effect of this alternating magnetic field, makes oscillating plate 4 produce sound vibration.The oscillating plate 4 that is driven by drive source 8 can form by magnetized metal sheet.Magnetic piece in the form of annular discs 16 is equipped with at the position in the central.Because oscillating plate 4 is metal sheets, so magnetic piece 16 is to be used for quality optional feature to oscillating plate 4 additional masss.At this moment, in order to constitute magnetic circuit together with oscillating plate 4, magnetic piece 16 usefulness magnetic materials form, and still, when only being purpose with the increase quality, also can use the nonmagnetic substance sheet.
In addition, oscillating plate 4 with its edge that is magnetized state be fixed on the cylindrical circular magnet 18 in the inside that is installed on shell 2 above.That is, oscillating plate 4 is magnetized under the magneticaction of magnet 18, is fixed under attraction force acts.Magnet 18 is securely fixed in the inside of shell 2 by the base 20 that is closed by the back side with shell 2 that can magnetized metal forms.Fixing the substrate 22 that terminal 12,14 is set at the back side of this base 20,, on the central shaft of magnet 18, be provided with unshakable in one's determination 24 at the central part of this substrate 22 and base 20.Unshakable in one's determination 24 are cylindric, between its end face and oscillating plate 4, form space 26, and this space 26 constitutes allows the space of carrying out magnetic coupling and vibration.On unshakable in one's determination 24, around coil 30, this coil 30 connects with terminal 12,14 by coil rack, as input current, supplies with the AC driving electric current from terminal 12,14, the alternating magnetic field that coil 30 is produced with oscillating plate 4 interlinkages.That is, magnet 18 is cylindrical, surrounds drive source 8.In addition, in this electroacoustic transducer, form closed magnetic circuit by oscillating plate 4, magnetic piece 16, drive source 8, magnet 18 and base 20 as the quality optional feature.When using the nonmagnetic substance sheet to replace magnetic piece 16, should from closed magnetic circuit, remove the quality optional feature as the quality optional feature.
The shape of this electroacoustic transducer and the electroacoustic transducer that has earlier shown in Figure 6 is compared, then as shown in Figure 3, the diameter of shell 2 (=a) set identically, still, the height b of shell 2 1Little, the V/V that resonant chamber 6 accounts in shell 2 is big, that is, and and will height c 1Set greatly.In addition, the height d of magnet 18 1Set lowly, and its internal diameter e 1Set greatly.b 2, c 2, d 2, e 2The corresponding position of the electroacoustic transducer that expression has earlier, its magnitude relationship is b 1＜b 2, c 1＞c 2, d 1＜d 2, e 1＞e 2
Like this, by improving the V/V of resonant chamber 6 in shell 2, can make resonance frequency f vBe significantly smaller than the numerical value that has earlier, thereby can set f at an easy rate o＞f vRelation.In the electroacoustic transducer of having set this relation, can obtain the sound pressure characteristic corresponding with temperature shown in Figure 1, temperature is set at T L=-40 ℃, T S=25 ℃, T HIn the time of=85 ℃, can confirm that sound pressure variations is about 1dB, can ignore.
Fig. 4 sets f o＞f vThe sound pressure characteristic of the electroacoustic transducer of relation, Fig. 5 is its coil current characteristic.Temperature is set at T L=-40 ℃, T S=25 ℃, T HIn the time of=85 ℃, the bandwidth f of regeneration frequency w(sound pressure characteristic of=1.7KHz～2.2KHz) can suppress to be about 1dB that can ignore, hence one can see that, can compensate sound pressure characteristic with variation of temperature with variation of temperature.
As mentioned above, according to the present invention, by the resonance frequency of resonant chamber being set less than the resonance frequency of oscillating plate, the variation of the sound pressure characteristic that can compensation temperature causes, obtain temperature independent stable sound pressure characteristic, when using its characteristic to vary with temperature significant plastic magnet, also can obtain stable sound pressure characteristic.

Claims (12)

1, a kind of temperature compensation of sound pressure characteristic of electric sound device conversion, wherein, electroacoustic transducer is provided with oscillating plate in the enclosure, front at this oscillating plate is provided with resonant chamber, at its back side drive source is set, make above-mentioned oscillating plate produce vibration by this drive source, outwards run out, it is characterized in that: set the resonance frequency of above-mentioned resonant chamber less than the resonance frequency of above-mentioned oscillating plate by the chatter of above-mentioned resonant chamber with oscillating plate.
2, the feature by the temperature compensation of the sound pressure characteristic of the described electroacoustic transducer of claim 1 is: at normal temperatures, set the resonance frequency of above-mentioned resonant chamber less than the resonance frequency of above-mentioned oscillating plate; When surpassing the high temperature of above-mentioned normal temperature, the frequency interval between the resonance frequency by dwindling above-mentioned resonant chamber and the resonance frequency of above-mentioned oscillating plate and improve the magnetic actuating force of above-mentioned drive source, the reduction of acoustic pressure when compensating high temperature; During low temperature below normal temperature, frequency interval between the resonance frequency by enlarging above-mentioned resonant chamber and the resonance frequency of above-mentioned oscillating plate and reduce the magnetic actuating force of above-mentioned drive source, the rising of acoustic pressure compensates sound pressure characteristic with variation of temperature with this when suppressing low temperature.
3, the feature by the temperature compensation of the sound pressure characteristic of the described electroacoustic transducer of claim 1 is: at normal temperatures, set the resonance frequency of above-mentioned resonant chamber less than the resonance frequency of above-mentioned oscillating plate; When surpassing the high temperature of above-mentioned normal temperature, the resonance frequency of above-mentioned resonant chamber is increased, reduce the resonance frequency of above-mentioned oscillating plate simultaneously, dwindle the frequency interval between these two resonance frequencys, and increasing the magnetic actuating force of above-mentioned drive source, acoustic pressure reduces during with the part compensation high temperature of its increase; During low temperature below normal temperature, the resonance frequency of above-mentioned resonant chamber is reduced, increase the resonance frequency of above-mentioned oscillating plate simultaneously, enlarge the frequency interval between these two resonance frequencys, and reduce the magnetic actuating force of above-mentioned drive source, acoustic pressure during with its part that reduces compensation low temperature rises, and compensates sound pressure characteristic with variation of temperature with this.
4, by claim 1,2, the temperature compensation of the sound pressure characteristic of 3 described electroacoustic transducers, it is characterized in that: with the resonance frequency of above-mentioned resonant chamber set during normal temperature less than the resonance frequency of above-mentioned oscillating plate, and make to have such interval between the two, promptly both magnitude relationship can not take a turn for the worse during variations in temperature.
5, press the temperature compensation of the sound pressure characteristic of the described electroacoustic transducer of claim 1, it is characterized in that: by increasing the V/V of above-mentioned resonant chamber, set the resonance frequency of above-mentioned resonant chamber less than the resonance frequency of above-mentioned oscillating plate with respect to above-mentioned shell.
6, press the temperature compensation of the sound pressure characteristic of the described electroacoustic transducer of claim 1, it is characterized in that: above-mentioned resonant chamber forms in the inside of above-mentioned shell, be cylinder, in the centre of above-mentioned shell above-mentioned oscillating plate being set seals it, simultaneously, communicate with ambient atmosphere by the louver that on above-mentioned shell, forms.
7, press the temperature compensation of the sound pressure characteristic of the described electroacoustic transducer of claim 1, it is characterized in that: louver forms on the internal face of above-mentioned shell, is cylinder, is positioned at the inside of above-mentioned resonant chamber.
8, by the temperature compensation of the sound pressure characteristic of the described electroacoustic transducer of claim 1, it is characterized in that: above-mentioned oscillating plate is equipped with the quality optional feature for corresponding with the shape of above-mentioned shell discoideus on it.
9, press the temperature compensation of the sound pressure characteristic of the described electroacoustic transducer of claim 1, it is characterized in that: above-mentioned oscillating plate is with can magnetized plate of magnetic material forming, be arranged on the above-mentioned resonant chamber inwall in the above-mentioned shell outstanding lug, nib and be fixed between the cylindrical circular magnet of above-mentioned enclosure, simultaneously, rely on above-mentioned magnet magneticaction that its edge is fixed.
10, press the temperature compensation of the sound pressure characteristic of the described electroacoustic transducer of claim 1, it is characterized in that: in the inside of above-mentioned shell, by above-mentioned oscillating plate, be fixed on the above-mentioned quality optional feature on the above-mentioned oscillating plate, above-mentioned drive source, surround the columnar magnet of above-mentioned drive source and support the base of this magnet to constitute closed magnetic circuit.
11, press the temperature compensation of the sound pressure characteristic of the described electroacoustic transducer of claim 1, it is characterized in that: above-mentioned drive source is assemblied in coil on the iron core that is fixed on above-mentioned base, to this coil input AC drive current, produce action of alternating magnetic field from the outside in above-mentioned oscillating plate.
12, by the temperature compensation of the sound pressure characteristic of the described electroacoustic transducer of claim 1, it is characterized in that: substrate and above-mentioned base are installed in the backside openings place of above-mentioned shell together, draw terminal to above-mentioned coil power supply from aforesaid substrate.
CN 93107429 1992-06-20 1993-06-19 Temperature compensation of sound pressure characterastics of electric sound inverter Expired - Fee Related CN1038095C (en)

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JP186138/92 1992-06-20
JP18613892A JPH066899A (en) 1992-06-20 1992-06-20 Temperature compensation method for sound pressure characteristic of electroacoustic transducer

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CN1083300A true CN1083300A (en) 1994-03-02
CN1038095C CN1038095C (en) 1998-04-15

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CN112827787A (en) * 2021-01-07 2021-05-25 歌尔股份有限公司 Ultrasonic transducer

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DE69323930D1 (en) 1999-04-22
EP0576216A2 (en) 1993-12-29
EP0576216A3 (en) 1994-08-31
DE69323930T2 (en) 1999-08-26
CN1038095C (en) 1998-04-15
EP0576216B1 (en) 1999-03-17
JPH066899A (en) 1994-01-14

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