CN1529840A - Electronic article comprising loudspeaker & touch pad - Google Patents

Abstract

A touch pad assembly (202) for use in an electronic article (190), the assembly comprising a touch pad (202), a coupler for mechanically coupling the touch pad (202) to casing (198) of the electronic article and a transducer (108) which is mounted by coupling means (66) on the coupler or the touch pad to drive the casing as an acoustic radiator. An electronic article incorporating the same. An electronic article (190) comprising a body in or on which a bending wave loudspeaker is mounted, the loudspeaker comprising a bending wave acoustic radiator (204) and an electromechanical force transducer (108) mounted to the radiator (204) to vibrate the radiator to produce an acoustic output characterised in that the transducer (108) has an intended operative frequency range and comprises a resonant element having a frequency distribution of modes in the operative frequency range and coupling means (66) for mounting the transducer (108) to the radiator.

Description

The electronic product that comprises loudspeaker and touch pad

Technical field

The present invention relates to electronic product, particularly low energy consumption or self-energizing article, those electronic products that use for the individual for example, as: mobile phone, personal organizer and pocket radio set.

Background technology

International Patent Application WO 00/69212 provides a kind of personal portable electronic product with main body or housing, on main body or housing or bending wave loudspeaker of interior installation.Bending wave loudspeaker comprises that an acoustic radiator and is installed on the radiator so that the radiator vibration produces the vibration exciter of voice output.Whole integratedly formation as one sprayed casting mold and limits main body or a sub regions of housing for described radiator and main body or housing.To such an extent as to the personal portable electronic product just means that this article are enough little and can hand.

Radiator can be a distribution pattern sound radiation loudspeaker, for example the sort of described in the International Application No. WO 97/09842.

Usually, the personal portable electronic product is the device or the self-energizing device of low energy consumption.

Summary of the invention

According to the present invention, one electronic product has a main body or housing, on main body or housing or bending wave loudspeaker of interior installation, described loudspeaker comprises a flexural wave acoustic radiator and an electromechanical power transducer, described transducer is installed on the radiator so that the radiator vibration produces voice output, it is characterized in that transducer has an expection operating frequency range, and comprise that one has a mode frequency resonant element that distributes and the coupling arrangement that is used for transducer is installed to radiator in the expection operating frequency range.Coupling arrangement can be installed on the resonant element.

Electronic product can be the long-range article that energy is provided, and for example has light or has the article of infrared ray power supply.Electronic product can be selected from wireless battery plate, individual PA or solar panel like this.Electronic product can be the low energy consumption article, for example there is not rope device, as: pocket radio set, walkman, personal digital assistant (PDA), electronic toy, hummer, multifrequency or single frequency tone Chinese percussion instrument, clock, electronics new product, notebook computer, computer mouse, keyboard, display, personal computer, monitor or television.Electronic product can also be the article of disposable (disposable), for example disposable loudspeaker or hummer, low-cost communicator, credit card, new product, book or card.

Acoustic radiator can be with main body or housing integral installation or molded.Radiator can be transparent, for example can be the zone that limits a display screen.

Acoustic radiator can be a touch pad.Acoustic radiator can be around the whole housing of touch pad or a part of housing.Coupling arrangement can comprise a touch pad, for example uses a frame around the touch pad periphery to be connected with shell sound.Transducer promptly can directly be installed on the touch pad, also can be installed on the frame and by the transducer drive shell.Touch pad can or separate locking element by whole locker, and for example screw, bolt or bayonet fixing are connected on the housing.Replacedly, touch pad can be installed on the shell with the friction mode.

Like this, the black box that comprises touch pad and transducer can be used to drive acoustic radiator.Because shell is as elementary acoustic radiator, touch pad and can be used as acoustic radiator around the shell of touch pad.If wish, at least one additional transducer can be installed on the described elementary acoustic radiator.In any electronics, for example notebook computer or personal digital assistant, described touch pad component can be replaced a standard touch pad.

Wipe the element that shakes and to be initiatively, for example can be piezoelectric transducer and can be the strip piezoelectric.Replacedly, resonant element can be passive, and transducer may further include an active transducer, for example inertia or ground vibration transducer (grounded vibration transducer), actuator or driver, for example moving coil transducer.Active transducer can be transducer crooked or that reverse (as the type described at WO00/13464).In addition, transducer can comprise initiatively and the combination of passive device, to form a mixing transducer.

Developed manyly, applied transducer, driver or the actuator structure of power as the structure of loudspeaker to acoustic radiator.These transducer architectures have many different forms, for example moving coil, moving magnet, piezoelectricity or magnetostriction type.Typically, generate heat with 99% of their intakes of the electrodynamics loudspeaker of coil and magnet type transducer loss, yet piezoelectric transducer only loses 1% energy.Like this, because the high-level efficiency of piezoelectric transducer, piezoelectric transducer is popular.

Several like this problems are arranged for piezoelectric transducer, and for example, if compare with filtter gold, they are stone inherently, and they are quite difficult with the acoustic radiator coupling like this, particularly with air.The rigidity that improves transducer can make basic mode of resonance reach higher frequency.Piezoelectric transducer has been considered to two working ranges like this.First working range is the basic resonance that is lower than transducer.This is " controlled rigidity " scope, and speed can increase along with frequency in this scope, and the output response need be carried out equilibrium usually.This just causes the loss of availability of efficient.Second scope is the resonance range outside range in stiffness, because resonance is quite violent, so this scope will be avoided usually.

Also have, general guidance is the resonance that suppresses in the transducer, and piezoelectric transducer only uses usually in the frequency range of being less than or equal to transducer basis resonance like this.When piezoelectric transducer is used to be higher than basic resonance frequency,, be necessary to apply damping for suppressing resonance peak.

These problems relevant with piezoelectric transducer similarly are applicable to the transducer that those comprise other " shrewdness " materials, " shrewdness " material promptly: magnetostriction, electrostriction and electret bulk material.Known have a multiple different piezoelectric transducer, and for example the publication number of Shinsei Corporation company is that the publication number of EP0993231A, Shinsei Corporation company is that the publication number of EP0881856A, MurataManufacturing company limited is that the publication number of US4593160, Sanyo Electric company limited is that the publication number of US4401857, Altec Corporation company is that the publication number of US4481663 and Sawafuji is the transducer described in the UK Patent Application of GB166022A.Yet, an object of the present invention is the transducer of application enhancements.

Be used for transducer of the present invention and can think the transducer of an Anticipation Mode.Coupling arrangement is connected on the resonant element in the position that helps the mode effect of resonant element is coupled on the interface.Can select the parameter of these resonant elements, for example aspect ratio, bending stiffness, thickness and geometric figure are to strengthen the mode profile at operating frequency range interior resonance element.The bending stiffness of resonant element and thickness can selectedly be isotropy or anisotropy.For strengthening the mode profile in the resonant element, can select the bending stiffness and/or the thickness that change.More available analytical approachs are selected parameter, and these analytical approachs are for example used finite element FEA or modeled computer simulation.

Strengthen this distribution by first pattern of guaranteeing active member near the lowest operating frequency that needs.Also can be gratifying by in operating frequency range, guaranteeing one, strengthen this distribution as high pattern density.Pattern density preferably enough provides with frequency concerning active member and is essentially an average power.Good NE BY ENERGY TRANSFER can provide the smoothing of useful mode resonance.Selectively, perhaps in addition, can pass through distributed resonance flexural wave pattern, the basic evenly enhancement mode on frequency distributes, promptly to response by " pack (bunching) " of pattern or the crest of the frequency that causes of clustering carry out smoothing.Therefore this transducer is known as distribution pattern transducer or DMT.

This Anticipation Mode or distribution pattern transducer are described in International Patent Application WO 01/54450.

Transducer can comprise a plurality of resonant elements, and each resonant element has a mode profile, and resonant element is crisscross arranged in operating frequency range, strengthens the mode profile as the transducer of a whole device.Resonant element can have different base frequencies, and these parameters of weight, geometric jacquard patterning unit surface or bending stiffness such as resonant element also can be different like this.

Resonant element can be by coupling arrangement in any mode easily, as connecting between two elements with hard short column (stub) usually.Resonant element is preferably in those mode that strengthen transducer and/or strengthens those Coupling point places that are coupled in the position that applies power and is coupled.The parameter that can select coupling arrangement is to strengthen the model profile in the resonant element.Resonant element can be positioned to one and fold.Tie point can be to axially align.

Resonant element can be a plate-like, or crooked on-plane surface.The plate-like resonant element can be made and have a plurality of slits or discontinuous, to form a multi resonant vibrating system.Resonant element can be the beam shape, trapezoidal, oval-shaped or plate-like roughly.Can be selectively, resonant element can be rectangular and can form around the bending along an axle of rectangle plane symmetry minor axis.

Resonant element can be the mode along two rectangular substantially axles, and each has a relevant base frequency.Be best modal distribution, the ratio of two base frequencies can be adjusted, for example 9: 7 (～1.286: 1).

For example, being provided with of this mode transducer can be in following any: flat piezoceramic disk, at least two or preferably combination, two similar piezoelectric beams, the combination of a plurality of similar piezoelectric beam, the combination of crooked piezoceramic disk, a plurality of crooked piezoceramic disk or two similar crooked piezoelectric beams of at least three flat piezoceramic disks.

By optimizing the frequency ratio of resonant element, i.e. the basic resonance frequency ratio of each of each resonant element, the staggered of the mode profile on each resonant element is enhanced.Like this, the parameter of each resonant element can be changed with respect to another, to strengthen all modal distribution of transducer.

When with the active resonant element of two beam shape forms, these two beams can have a frequency ratio of 1.27: 1 (be base frequency than).For the transducer that comprises three beams, frequency ratio can be 1.315: 1.147: 1.For the transducer that comprises two dishes, for optimizing high-order model density, frequency ratio can be 1.1+/-0.02 to 1, and perhaps, for optimizing lower-order model density, frequency ratio can be 3.2: 1.For the transducer that comprises three dishes, frequency ratio can be 3.03: 1.63: 1, or 8.19: 3.20: 1.

Can select the parameter of coupling arrangement, to strengthen the mode profile in operating frequency range interior resonance element.Coupling arrangement can be residual, for example the controllable layer of glue.

Coupling arrangement can be located with respect to panel asymmetricly, is connected with transducer asymmetricly.It is this asymmetric to have several modes to obtain, for example by regulating position and the direction of transducer with respect to the axis of symmetry of panel or transducer.

Coupling arrangement can form the line of a strip connector.Selectively, coupling arrangement can form the little regional area of a point or connector, and in this zone, the connector zone is very little with respect to the size of resonant element.Coupling arrangement can be the form of short column and little diameter is arranged that for example 3 to 4mm.Coupling arrangement can be the little material of quality.

Coupling arrangement can comprise the tie point more than, and can comprise the combination of connector point and/or the combination of connector line.For example, can use two points or two little regional areas of connector, one is positioned near the center, and another is positioned at the edge of active member.This mode is useful to the plate-like transducer that in general those have rigidity and high natural resonance frequency.

Replacedly, also a tie point can only be set.Under multi resonant shook the situation of element arrays, this can have such benefit, that is: lump together by the output of a Connection Element with all resonant elements, can no longer by load they be lumped together concerning output like this.Can select coupling arrangement to be positioned at the antinode of a resonant element, also can select to impose a constant mean force with frequency.Coupling arrangement can be positioned at the position away from the resonant element center.

Can select the position and/or the direction of connector line, to optimize the model density of resonant element.Preferably, the connector line does not overlap with the line of symmetry of resonant element.For example, for the rectangle resonant element, the short axis of symmetry (or center line) that the connector line can the off-resonance element.The direction of connector line can be parallel to the axis of symmetry of panel.

Shape that can the selective resonance element, so that the line of eccentricity of a connector to be provided, this line of eccentricity is the mass centre of resonant element normally.The benefit of this embodiment is that transducer is connected at mass centre's point, does not so just have intrinsic imbalance.This can obtain by the resonant element of a symmetric shape, and the resonant element of this symmetric shape can be trapezoidal or irregular quadrilateral.

For the transducer that comprises a beam shape or common rectangle resonant element, the connector line can extend on the whole width of resonant element.The area of resonant element is little with respect to the area of acoustic radiator.

Acoustic radiator can be the panel shape.Panel can be flat with lightweight.The material of acoustic radiator can be an anisotropy or isotropic.

Acoustic radiator can have one as said the sort of resonance flexural wave mode profile among the WO97/09842, and can select the acoustic radiator characteristic with basic evenly distributed resonance flexural wave pattern on frequency, that is: smoothly the resonance frequency place by " pack " of pattern or the crest that clusters and cause.

Especially, can select the acoustic radiator characteristic with basic evenly distribution lower frequency resonance flexural wave pattern on frequency.Lower frequency resonance flexural wave pattern is 10 to 20 minimum frequency resonance flexural wave patterns of acoustic radiator preferably.

Lower frequency resonance flexural wave pattern particularly is coupled to be coupled to resonance flexural wave pattern substantially equably in acoustic radiator in the position that can select transducer.In other words, transducer can be installed in the initiatively high relatively place of resonance antinode number of acoustic radiator internal vibration, is the resonant section low relatively place of counting out on the contrary.Any this position can be used, but the position of most convenient is to be positioned at along near the position center of the length of acoustic radiator and wide 38% to 62%, except the center.Special or preferred positions be along wheelbase from 3/7,4/9 or 5/13 position; Ratio to length axle and width axes carries out preferred different.Preferably aspect ratio is 4/9 a length of the isotropy panel of 1: 1.13 or 1: 1.41,3/7 width place.

Operating frequency range can be to spread all over a wide relatively frequency range, can be audiorange and/or ultrasonic range.Because the usefulness of distribution pattern transducer can also be applied in sonar and sound ranging and the imaging, and these all have been to use the bandwidth of broad and/or the situation of energy that may be higher.Therefore, operate spreading all over a scope, promptly, can obtain the natural resonance of transducer greater than by accounting for dominant frequency institute restricted portion separately.

Low-limit frequency preferably is higher than a predetermined low frequency that limits in the operating frequency range, and this limits the basic resonance that frequency is approximately transducer.

For example, for beam shape resonant element initiatively, this power can obtain from the center of beam, and and the pattern form of the acoustic radiator accompanying with it be complementary.Like this, action and reaction can be cooperated to provide a constant frequency output.Because the antinode at resonant element is connected to acoustic radiator with resonant element, low impedance can appear in first resonance of resonant element.Like this, acoustic radiator does not amplify the resonance of resonant element.

According to a second aspect of the invention, a touch pad component that is used for electronic product is provided, for example notebook computer or PDA, this assembly comprises a touch pad, be used for touch pad is mechanically connected to coupling arrangement on the electronic product casing, and transducer, this transducer be installed on the coupling arrangement or on the touch pad to drive housing as acoustic radiator.

Coupling arrangement can be the form around the frame of touch pad periphery.Transducer can be installed on the touch pad or on the described frame.Touch pad can or separate locking element (for example screw, bolt or bayonet fixing) by whole locker and be connected on the housing.Replacedly, touch pad can be installed on the shell with the friction mode.

Description of drawings

In the mode of example, in relevant drawings, the present invention is carried out the explanation of figure tabular form, wherein:

Figure 1A represents the front perspective view of disposable loudspeaker of the present invention;

Figure 1B is the sectional view along the line AA among Figure 1A;

Fig. 2 A and Fig. 2 B represent the front perspective view and the side perspective view of loudspeaker of the present invention;

Fig. 3 represents the mouse of personal computer or the sectional view of pointing device of being used for of the present invention;

Fig. 4 represents the sectional view that is installed on the loudspeaker in the shell of the present invention;

Fig. 5 represents the sectional view of personal digital assistant of the present invention or other pocket computers;

Fig. 6 A and 6B represent the side and the planimetric map of speaker system of the present invention;

Fig. 7 represents the skeleton view of notebook computer of the present invention;

Fig. 8 represents along the sectional view of the line AA (shown in Fig. 7) of second notebook computer of the present invention's use;

Fig. 9 A and 9B are the plane and the sectional views of touch pad component;

Partial cross section figure behind the touch pad component that is installed on electronic equipment shown in Fig. 9 C presentation graphs 9A and the 9B;

Fig. 9 D represents the part skeleton view of the notebook computer casing inside of the touch pad component shown in installation diagram 9A and the 9B;

Figure 10 A and 10B represent a kind of known notebook computer respectively and have used the voice output curve map with respect to frequency of the notebook computer of touch pad component shown in Fig. 9 A;

Figure 10 C has represented to use the space average with respect to frequency of second notebook computer of touch pad component shown in Fig. 9 B to transmit the dB function curve diagram;

Figure 11 A represents the front view of PDA(Personal Digital Assistant) of the present invention;

The side cross-sectional view of PDA shown in Figure 11 B presentation graphs 11A;

Figure 12 A represents the skeleton view of visual display unit of the present invention (VDU);

The sectional view of the part of the VDU shown in Figure 12 B presentation graphs 12A;

Figure 13 A represents the front view of credit card of the present invention;

The side cross-sectional view of credit card A-A along the line shown in Figure 13 B presentation graphs 13A;

The side cross-sectional view of credit card B-B along the line shown in Figure 13 C presentation graphs 13A;

Figure 14 represents the skeleton view of greeting card of the present invention;

Figure 15 A represents the front view of PDA(Personal Digital Assistant) of the present invention;

The side cross-sectional view of PDA shown in Figure 15 B presentation graphs 15A;

But Figure 16 to 22 expression is used for the side view of preference pattern transducer of the present invention;

But Figure 23 represents to be used for the planimetric map of a preference pattern transducer of the present invention;

Figure 24 a represents to be used for the transducer modal parameter diagram planimetric map of use of the present invention;

Sectional view shown in Figure 24 b presentation graphs 24a perpendicular to the transducer connecting line;

Figure 25 a represents to be used for the diagram planimetric map of use transducer modal parameter of the present invention

The graphic planimetric map of the transducer shown in Figure 25 b presentation graphs 25a.

Embodiment

Figure 1A and 1B show a kind of disposable loudspeaker, for example: multifrequency loudspeaker, disposable hummer, credit card or other new-type loudspeakers.Loudspeaker comprises that can be supported a bending wave vibration, and preferably the panel 60 of resonance bending wave vibration is installed to the transducer of exporting with excitation bending wave vibration and generation sound on the panel 60 62 with one by being connected short column.Transducer 62 be the expection the mode transducer or as before this at the sort of distribution mode transducer described in the WO01/54450.Transducer 62 comprises a piezoceramic disk element 64.Article two, flexibly connect line 68 and provide electricity output to element 64.

Fig. 2 shows the loudspeaker 58 that is similar to shown in Figure 1A and the 1B, and those total elements have identical Reference numeral.Loudspeaker 58 is installed to along on the support frame 84 of loudspeaker periphery extension by the peripheral thing 86 of flexibility.Support frame 84 that loudspeaker is installed on the surface easily or additional support on.

Fig. 3 shows the cross section of the mouse 88 that is used as pointing device in the computer system (not shown).Mouse 88 comprises standard component, for example: ball 90, lower case 92 and cover 94.Lid 94 is designed to support bending wave vibration, preferably supports the resonance bending wave vibration.A kind of transducer 108 of Anticipation Mode is installed to by connection short column 66 and covers on 94 with excitation bending wave vibration and the output of generation sound.

Transducer comprises upper and lower bimorph beam 112 and 110, and last piezoelectric crystal beam 112 is connected to by the short column 66 that extends on the whole width of beam and covers on 94.Wide and the height of short column can be 1-2mm, can be made by duroplasts and/or metal, and have the suitable insulation layer to prevent electrical short.

Put the beams in place 112 than underbeam 110 length, these two beams are installed short column 152 by the centre and are connected.Each beam is formed by three layers, i.e. the skin of two piezoceramic materials, and for example: PZT 5H, the centre accompanies center brass blade.Outer be typically 10 to 15 microns adhesive coating by thickness and be connected with latten(-tin).

Fig. 4 shows and can support bending wave vibration, preferably the panel 60 of resonance bending wave vibration.Panel 60 is installed in the fully sheathed case 154 by the compliance suspension 156 that extends at panel 60 peripheries.One transducer 108 that is similar to Anticipation Mode used among Fig. 3 is installed on the panel 60 by a connection short column 66, with excitation bending wave vibration and the output of generation sound.

Fully sheathed case 154 can prevent that substantially the sound generating that the sound that gives off from the back side 155 of panel 60 and front 157 from panel give off from interfering.Case 154 is used as baffle to prevent the counteracting of sound like this.Can charge into suitable absorber in the case 154.

Fig. 5 shows personal digital assistant (PDA) 158, and it comprises conventional element, that is: support the shell 176 of keyboard 170 and one to be pivotally attached to lid 180 on the shell 176 with rotating shaft 178.Lid 180 is supported a display 172, and display can be LCD (LCD) or thin film transistor (TFT) (TFT) and the selectable front window 174 that can be installed in the display front.Cover 180 and be designed to support bending wave vibration, preferably the resonance bending wave vibration.The transducer 62 of Anticipation Mode, the transducer shown in Figure 1A and the 1B 62 for example is installed to and cover on 180 by connecting short column 66, exports with excitation bending wave vibration and generation sound.

Transducer 62 has a mechanical sources impedance and the mechanical sources impedance phase coupling of covering 180, thereby can obtain maximum transmission energy.As interchangeable or other, transducer can be installed on the shell 176.

Fig. 6 A and 6B show and comprise and can support bending wave vibration, preferably the transducer 62 of the panel 60 of resonance bending wave vibration and Anticipation Mode, for example transducer shown in Figure 1A and the 1B 62.Transducer 62 is installed on the panel 60 by connecting short column 66, to encourage bending wave vibration and to produce voice output.

Provide signal by an amplifier 182 that is installed on the panel 60 for transducer 62.This system also is included as the power supply 184 that amplifier provides energy, for example battery, solar cell or direct current infrared couplings.Like this, speaker system 186 is suitable for as a wireless device job, and it can be used for wireless panel/individual PA, self energizing solar panel, wireless device or portable radio/walkman.Light/red place the power supply of can be the fully remote energizing quantity of system 186-for example.

Fig. 7 and 8 shows notebook computer 190, and it comprises following standard component, that is: support the pedestal 198 of keyboard 200 and touch pad 202 and be pivotally attached to lid 194 on the pedestal by rotating shaft 196.Display screen 192 is installed to and covers in 194.Keyboard 200 is towards display screen 192.Be positioned at as the touch pad 202 of fixed point function near the center on the limit 201 of close user's pedestal 198.

In Fig. 7, two for example those are used for the mode transducer 62 of Figure 1A and 1B, are installed to the upper surface of pedestal by the short column 66 that is positioned at pedestal.Replacedly, as shown in Figure 8, also can use as being used for the mode transducer 108 of Fig. 3.The upper surface of pedestal is designed to have all or part of that can cover pedestal, and can supports bending wave vibration, preferably the zone 204 of resonance bending wave vibration.In arbitrary embodiment, transducer is installed to two such zones with excitation bending wave vibration and the output of generation sound.Transducer designs becomes to drive the impedance of local loop base tool, to obtain a high-caliber mechanical couplings efficient.

Fig. 9 A and 9B show touch pad component 203, and it can be used for replacing the touch pad of Fig. 7 and 8, or replace the touch pad among other embodiment of the present invention.Frames 205 that touch pad component 203 comprises touch pad 202, extend along touch pad 202 periphery and be installed to transducer 207 on the frame.Slot on the frame, frame has the cross section that is as general as U-shaped thus.Touch pad 202 and transducer 207 all are installed in the groove, but they are separated by an air groove 213.

Touch pad 202 is made by glass fiber reinforced plastics wiring board material (glass fibre reinforcedplastics circuit board material), and the impedance of about 3.59Ns/m is arranged.202 about 0.4mm are thick for touch pad, and one 170 microns plastic tab adheres on the front surface of touch pad 202.Plastic tab provides the skin of an ornamental or protectiveness.

As shown in Fig. 9 C, the frame 205 of touch pad component 203 is installed on the shell 209 of electronic equipment, these electronic equipments such as notebook computer or personal digital assistant.Transducer 207 drives bending wave vibration in frame 205.Frame 205 mechanically with acoustics be connected on the shell, the vibration transfer of frame is to shell 209 thus.Shell forms the elementary acoustic radiator of electronic equipment.

Impedance phase coupling after the combination of selection transducer 207 and touch pad and wrist pad.Transducer is DMT preferably, but interchangeablely also can be inertia or land vibration transducer (grounded vibrationtransducer), actuator or driver, for example moving coil transducer, piezoelectric transducer, magnetostriction driver or transducer crooked or that reverse (as the type described at WO00/13464).

Fig. 9 D shows the section of an inside of the notebook computer that touch pad component is installed.Fig. 9 D shows shell surface top end view downwards.Touch pad 202 is supported in and forms the wrist frame in the shell 209, and described shell has the zone 240 on the both sides that are positioned at touch pad 202.Shell 209 also comprises an inner hole 241 that embeds keyboard, and molded sept 242 separates hole and wrist frame zone 240.Thickness is that the polystyrene batten 243 of 1.5mm is attached to downwards on the edge of wrist seat to help the boundary condition of panel.The second batten (not shown) attaches on the wrist seat at the another side of touch pad.Batten extends between the front wall 244 of shell 209 and molded separator 242.

In the embodiment of each notebook computer, for avoiding mixed and disorderly vibration (spurious rattles), little foam spacer can be installed on any button of shell with the chassis that is connected CPU (central processing unit) to the sheet metal that the wing is arranged of heating radiator.

The benefit of She Zhiing is that touch pad and transducer can be combined as single black box like this.In addition, the additional electrical that is used for transducer connects 211 and can easily be added to the touch pad 202 that has had electrical connection for other purposes.Whole assembly can reduce complicacy, weight and cost, also occupies few space, and these all are valuable concerning portable electronic products.

Figure 10 A and 10B show the frequency response of the notebook computer that known DELL (TM) notebook computer that has a Microspeaker and inner touch pad replaced by the touch pad component shown in Fig. 9 A and the 9B.Measurement is carried out at the 25cm place above being higher than the wrist pad, notebook computer be placed on have enough weights and not to measuring on the influential flat table of output.Can obtain three times improvement level according to notebook computer of the present invention.

And notebook computer according to the present invention has a capacitive reactances loudspeaker that has basically.100ohms when especially, the mould of impedance is reduced at 10kHz from surpassing 1000ohms when the 1kHz.Like this, usually loudspeaker is along with the increase of frequency has the energy of a reduction, particularly to music.

Figure 10 C shows the performance of Compaq (TM) notebook computer, and in this notebook computer, touch pad is similar to the assembly shown in Fig. 9 A and replaces.Transducer is installed on the touch pad and drives touch pad and shell (wrist seat) at the either side of touch pad.The panel boundary condition limits as Fig. 9 D.The wrist seat is suitable for that equal mechanical impedance is arranged on arbitrary limit of touch pad.The overall impedance that the impedance design one-tenth of transducer and panel and wrist seat merge is complementary.Like this, transducer is a twin beams transducer, and it is wide than standard beam respectively, and length is 42mm and 39mm.

The low frequency that an about 400Hz is arranged as shown in Figure 10 C limits.Voice output is by the sound load control that is positioned at panel back, and if the little air groove of panel back reduce, bandwidth will obviously be reduced.For example, reduce to 200Hz for the 6mm Time Bandwidth for suitable transducer air groove, if but air groove when reducing to 2mm, low frequency limits will rise to 600Hz.

Figure 11 A shows the front view of PDA(Personal Digital Assistant), and it has touch-screen 214 usually, also is useful on the button 216 of control and data input.Sectional view among Fig. 9 illustrates in greater detail PDA.Shell 218 is made up of two parts usually, and these two parts are installed together with the display screen 220 of packing into, and electronic circuit is installed on the inner printed circuit board (PCB) on 224.The back of shell (normally casting) by short column 66 bonded transducer 108 with radiation sound.Transducer 108 comprises the longer beam 112 of a driving short column, with second beam 110 that is connected by second short column 152.Although longer in this case beam is near shell 218, these two beams can exchange without any infringement ground.Lead is set is used for electricity input connection.

Figure 12 A shows the skeleton view of visual display unit 137, and it can be made into the mode of any hope, for example cathode-ray tube (CRT) or LCD.Visual display unit 137 is included in the front case shape shell 101 of display screen 37, back and relative side 102 is housed.As clearer illustrating among Figure 12 B, the panel 2 that is as general as rectangle is limited by groove 3 on each relative side 102.Each panel 2 comprises the sandwich layer 22 that is clipped in two cortexes, 21 centres.Aforesaid twin beams transducer 108 is pasted on each panel 2, to encourage/to evoke flexural wave to panel and to cause their resonance generation sound output.

Mechanical impedance and the coupling of the side mechanical couplings that can obtain of the application of the transducer 108 of expectation mode by transducer.Like this, although panel 2 can design especially to optimize sound performance, promptly can be light and hard, this is all inessential.So just needn't fundamentally change production requirement and the method that monitor/the TV producer adopted.

Figure 13 A to 13C shows credit card 226, in credit card, single-beam transducer 62 be installed in credit card 226 main body 228 the bag 230 in.Transducer 62 is by driving credit card radiation sound by Unitarily molded short column 66 on main body 228.Bag 228 fills other parts of being permitted transducer 62 free vibrations and can not running into credit card.Credit card is by electronic circuit 230 energy supplies that embed, electronic circuit comprise power supply, storer, signal processor and amplifier and be connected to transducer 62 wire connecting 236 on.Be used to seal transducer 62 and electronic circuit 230 by suitable paper, plastics or metal thin lid 232.

Figure 14 shows greeting card or similar card (81), and the form of this card is preceding page or leaf 83 and the back page or leaf 85 with folding element.Transducer 62 is attached on one of them page or leaf by a little short column (not shown), preferably on the back page or leaf 146, can make the page or leaf vibration like this and cause that its resonance exports with generation sound.Transducer 62 is driven by a signal generator/amplifier battery unit 87, and battery unit is opened by the switch 89 of the burst that is hidden in card, like this can be when card be opened the enabling signal generator.

Figure 15 A and 15B show the PDA that is similar among Figure 11 A and the 11B, and total element is represented with identical Reference numeral.Here the different of said PDA and front are that it comprises a lid 215, and this lid can be protected touch-screen 214, and the operation of touch-screen being write or drawing at the open position of touch-screen, i.e. normal use.Twin beams transducer 108 attaches to by short column 66 and covers on 215, can make like this to cover 215 as loudspeaker.Short column 66 can integral body casts onto and covers on 215.Transducer 108 comprises that two have the beam 110,112 that different length links together with a short column 66.Utilizing electric wire to be electrically connected with the interior driving circuit of the main body 218 of PDA (not shown) is connected.

Remaining illustrates interchangeable transducer, these transducers can with the use of cooperating at the embedding loudspeaker shown in Fig. 1 to 15b.The transducer of expectation mode is compared and can reduced qualitatively with on the degree of depth with moving coil/permanent magnet design.So, use the general assembly (TW) that such transducer can reduce loudspeaker, transducer should be suitable for installing in limited space.Like this, transducer just can be suitable for those portable application shown in Fig. 1 to 15B ideally.

Figure 16 shows transducer 42, and this transducer comprises first piezoelectric beam 43, by the short column 48 that is positioned at two beam centers second piezoelectric beam 51 is installed at the back side of first piezoelectric beam.Each beam all is a bimorph.First piezoelectric beam 43 comprises that two layers of piezoelectric material layer 44,46, second piezoelectric beam 51 comprises two-layer 50,52.The utmost point of each of piezoelectric layer is to representing with arrow 49.Each of bimorph layers 44,45 and layer 46,52 in addition have the opposite utmost point to.Bimorph can also comprise a center conductor blade, and this blade allows parallel electrical connection to add a reinforcing element as piezoelectric ceramics layer in the same way.Each layer of each beam 44,46 can be made by identical/different piezoelectric.Each layer has different length usually.

The coupling arrangement of the short column 56 of first piezoelectric beam 43 by being positioned at the first beam center is installed on the panel 54.By install first beam therein the heart have only even level pattern (even order mode) could produce output.By second beam being positioned at the first beam back, and two beams are linked together at the center by short column, they can be considered to drive identical axially aligning or identical position.

When element links together, the result of mode profile be not each component from the addition of frequency series because each element changes the pattern of other elements.Two beams are designed so that their modal distribution separately interlocks, and can strengthen the global mode of transducer like this.In the whole frequency range that relates to, two beams add together can produce useful output.Because the interaction between even level mode piezoelectric beam separately, produce local narrow recessed.

Can recently select second beam with the basic resonance of two beams.If material is identical with thickness, so frequency ratio only be the length ratio square.If when being placed on half position in the middle of f0 and the other f1 simply, also be consistent than the f3 of girder and the f4 of low beam than the higher f0 (base frequency) of crossbeam.

By being that two beams are drawn the cost function curve discovery with respect to frequency ratio, desirable ratio is 1.27: 1.That is to say cost function minimum in this.This is than " gold " aspect ratio that equals to describe among the WO97/09482 (ratio of f02: f20).The method of improving transducer mode can expand in transducer with three piezoelectric beams.Desirable ratio is 1.315: 1.147: 1.

The combination active member, for example the method for piezoelectric beam can expand to and use piezoceramic disk.With two piezoceramic disks, the size of two piezoceramic disks will consider that than relying on how many patterns determine.To high-level modal density, the base frequency of 1.1+/-0.02 to 1 can draw result preferably.To low level modal density (promptly before several or preceding 5 patterns), 3.2: 1 base frequency is than being suitable.First gap is created between second pattern and three-mode than deep bid.

Since a big gap is arranged between the first and second radius patterns of each dish, better more staggered with three dishes than just obtaining with two dishes.When the 3rd dish joined the double plate transducer, obvious first target be clog foregoing than the gap between second and the three-mode of deep bid.Yet geometric progression shows that this is not unique answer.Use f0, α .f0, α ².f0 base frequency is drawn rms (α α ²), α there are two main optimum values.These two values approximately are 1.72 and 2.90, and a back value is obviously corresponding with gap filling method.

Use f0, the base frequency of α .f0 and β .f0, making two calibrations is freely, and is worth (seed values) with top α value as the source, can obtain better optimum value.Parameter is to (α β is (1.63,3.03) and (3.20,8.19)).These optimum values are very shallow, and the variation that this means parameter value 10% or 20% is acceptable.

The interchangeable method of determining different dishes is to take all factors into consideration the cost function of the radius ratio of three dishes.Cost function is RSCD (central difference and ratio), SRCD (central difference ratio and) and SCR (center ratio with).For each group model frequency f ₀, f ₁, f _n... F _N, these functions are determined by following formula:

RSCD (R of CD summation):

$\mathrm{RSCD}=\frac{\frac{1}{N-1}\underset{n=1}{\overset{N-1}{\mathrm{\&Sigma;}}}{(f_{n+1}+f_{n-1}-2f_n)}^2}{{\mathrm{<figure-callout\; id="0"\; label="f"\; filenames="A0281431000232.png,A0281431000321.png"\; state="\{\{state\}\}">f</figure-callout>}}_0}$

SCRD (RCD summation):

$\mathrm{SRCD}=\frac{1}{N-1}\underset{n=1}{\overset{N-1}{\mathrm{\&Sigma;}}}{\left(\frac{f_{n+1}+f_{n-1}-2f_n}{f_n}\right)}^2$

CR：

$\mathrm{SCR}=\frac{1}{N-1}\underset{n=1}{\overset{N-1}{\mathrm{\&Sigma;}}}\left(\frac{f_{n+1}\&CenterDot;f_{n-1}}{{\left(f_n\right)}^2}\right)$

The optimum radius ratio, promptly the minimum place of cost function is 1.3 to all cost functions.Since radius ratio square equal frequency ratio, concerning the dish of these same materials and thickness, 1.3 * 1.3=1.69,1.67 analysis result is very consistent so.

Replacedly or in addition, passive device can be used for transducer to improve its whole mode.Active and passive device can stackedly be provided with.Figure 17 shows the multilayer plate-like transducer that comprises two active piezoelectric elements 72 that stack two passive resonant elements 74 thereon, for example thin metal dish of active and passive device interleaving mode.

Each element couples together with the coupling arrangement that is positioned at middle short column 78 forms of each active and passive device.Each element is arranged with one heart.Each element has different sizes, and the minimum dish with maximum lays respectively at top and the bottom that stacks layer.The coupling arrangement of the short column 78 at the center of the passive device of transducer 70 by being positioned at first maximum disc is installed on the load device 76, for example a panel.

The method of improving transducer mode can expand to the transducer of the active member that comprises that two piezoelectricity is board-like.Be of a size of (1 takes advantage of α) and (α takes advantage of α ²) plate (3/7,4/9) locate the coupling.So frequency ratio is approximately 1.3: 1 (1.14 * 1.14=1.2996).

As shown in figure 18, little mass 104 can be installed in the end of the piezocrystal transducer 106 with coupling arrangement 105.In Figure 19, transducer 114 is inertia electrodynamics moving coil drivers, and for example described in the WO97/09842, it has the sound coil that forms active member 115 and the passive resonant element of mode plate 118 forms.Active member 115 is installed on the mode plate 118 and the center of departing from the mode plate.

Mode plate 118 is installed on the panel 116 by web member 120.The axle 119 of web member and active member aligns but does not align with axle (Z) perpendicular to the face of panel 116.Transducer does not overlap with panel axle (Z) like this.Active member is connected with the electric signal input by electric wire 122.Be equipped with the hole on the mode plate 118 with minimizing the sound radiation from there, the center of the position deviation mode plate 118 of active member, for example in the installation site of the best, i.e. (3/7,4/9).

Figure 20 shows transducer 124, and it comprises that the coupling arrangement 126 by the short column form is installed to the active piezoelectric resonator of panel 128.The breadth length ratio that transducer 124 and panel 128 all have is 1: 1.13.Coupling arrangement 126 not with transducer or panel the axle (130, Z) alignment.In addition, coupling arrangement is positioned at the optimum position, promptly with respect to transducer 124 and panel 128 off-centre.

Figure 21 shows the initiatively transducer 132 of piezoelectric resonator form of beam shape.Transducer 132 is connected on the panel 134 by the coupling arrangement of two short column forms.A short column is positioned at the end 138 of beam, and another short column is positioned at the center of beam.

Figure 22 shows and comprises two transducers 140 by the active resonant element 142,143 of coupling arrangement 144 connections, also comprises a peripheral thing 148 around coupling arrangement 144 and resonant element 142.Transducer can damping vibration and impact like this.Peripheral thing by low mechanical impedance rubber or can be by comparison polymkeric substance make, can not hinder the work of transducer like this.If polymkeric substance is a waterproof, transducer 140 can be made into waterproof.

Resonant element 142 is bigger than the following resonant element 143 that the coupling arrangement by the short column form is connected to panel 145.Short column is positioned at the center of resonant element 143 down.The mains connection 150 that is used for each active member has good sound to be connected from peripheral thing extension and permission with the load device (not shown).

Figure 23 shows the initiatively transducer 160 of resonant element form of a plate-like.On resonant element, form many seams 162 and limit many finger pieces 164, so just form a multi resonant vibrating system.Resonant element is installed on the panel 168 by the coupling arrangement of short column 166 forms.

In Figure 24 A and 24B, transducer 14 is rectangular and has certain on-plane surface curvature, and is the piezoelectric transducer of a precompressed, as (International Application No. WO 96/31333) described in United States Patent (USP) 5632841, it is produced by PAR technology company, and trade mark is NASDRIV.Transducer 14 is initiatively resonant elements like this.Transducer has wide (W) and the position (X) of long (L) and mounting points 16.

The flexibility of transducer 14 means that coupling arrangement 16 is connections of linear formula.When transducer was installed along the connecting line of the minor axis that passes the center, the resonance frequency of two arms of transducer was identical.Best hitch point can modelling, is 43% to 44% the connecting line that is positioned at the length of resonant element.When this is worth, cost function (or " bad " measures) minimum; This is about as much as the connection at 4/9 place of length.In addition, computation model shows that this tie point is effective in the transducer width range.Second hitch point also is suitable at 33% to 34% place of resonant element length.

By with respect to the curve map of aspect ratio (AR=W/2L), optimal aspect ratio can be defined as 1.06+/-0.01 to 1, minimum when cost function is worth at this in order to be installed in the cost drawn along its resonant element of position of length 44% (or rms center than).

Optimum embedding angle θ with respect to panel 12 can find best angle with two " bad measurement (measures ofbadness) ".For example, the standard deviation of response logarithm (dB) level is the measurement of " rough (roughness) ".This numeral is described in International Application No. WO 99/41839 with respect to advantages/disadvantages of the present invention.Be to optimize transducer, promptly use aspect ratio 1.06: 1 and tie point at 44% model, because that vicinal is put is asymmetric, the rotation that connects 16 lines will have a considerable influence.Have one to be 270 ° with reference to angle, a promptly long end face left.

Figure 25 A and 25B show the transducer 18 of a symmetric shape, and resonant element has trapezoidal cross section.Trapezoidal shape is determined that by two parameters these two parameters are AR (aspect ratio) and TR (taper ratio).AR and TR determine the 3rd parameter lambda, and more such mandatory conditions can be satisfied, and be equal as the both sides quality of line.

The equation of constraint of quality such as following formula is (or homalographic);

$\underset{0}{\overset{\mathrm{\&lambda;}}{\&Integral;}}(1+2\mathrm{TR}(\frac{1}{2}-\mathrm{\&xi;}))\mathrm{d\&xi;}=\underset{\mathrm{\&lambda;}}{\overset{1}{\&Integral;}}(1+2\mathrm{TR}(\frac{1}{2}-\mathrm{\&xi;}))\mathrm{d\&xi;}$

Following formula can be obtained non-independent variable TR or λ easily, provides:

Or

$\mathrm{TR}=\frac{1-2\mathrm{\&lambda;}}{2\mathrm{\&lambda;}(1-\mathrm{\&lambda;})}$

$\mathrm{\&lambda;}=\frac{1+\mathrm{TR}-\sqrt{1+{\mathrm{<figure-callout\; id="2"\; label="TR"\; filenames="A0281431000301.png,A0281431000343.png"\; state="\{\{state\}\}">TR</figure-callout>}}^2}}{2\mathrm{TR}}\&ap;\frac{1}{2}-\frac{\mathrm{TR}}{4}$

Equation can conveniently obtain moment of inertia and equate, or minimizes total moment of inertia.

Be used for equating that the equation of constraint of moment of inertia (or equal second area moment) is:

$\underset{0}{\overset{\mathrm{\&lambda;}}{\&Integral;}}(1+2\mathrm{TR}(\frac{1}{2}-\mathrm{\&xi;})){(\mathrm{\&lambda;}-\mathrm{\&xi;})}^2\mathrm{d\&xi;}=\underset{\mathrm{\&lambda;}}{\overset{1}{\&Integral;}}(1+2\mathrm{TR}(\frac{1}{2}-\mathrm{\&xi;})){(\mathrm{\&xi;}-\mathrm{\&lambda;})}^2\mathrm{d\&xi;}$

$\mathrm{TR}=\frac{({\mathrm{\&lambda;}}^2-\mathrm{\&lambda;}+1)(2\mathrm{\&lambda;}-1)}{2{\mathrm{\&lambda;}}^4-4{\mathrm{\&lambda;}}^3+2\mathrm{\&lambda;}-1}$

Or

$\mathrm{\&lambda;}\&ap;\frac{1}{2}-\frac{\mathrm{TR}}{8}$

The equation of constraint that is used to minimize total moment of inertia is:

$\frac{d}{\mathrm{d\&lambda;}}\left(\underset{0}{\overset{1}{\&Integral;}}(1+2\mathrm{TR}(\frac{1}{2}-\mathrm{\&xi;})){(\mathrm{\&lambda;}-\mathrm{\&xi;})}^2\mathrm{d\&xi;}\right)=0$

Or

TR＝3-6λ

$\mathrm{\&lambda;}=\frac{1}{2}-\frac{\mathrm{TR}}{6}$

The result that cost function (" bad " measure) is drawn out 40FEA is the scope from 0.9 to 1.25 at following condition: AR, the scope of TR from 0.1 to 0.5, and constraint λ equates quality.Transducer is installed in mass centre like this.The result is made into form, and demonstrates their optimum shape, wherein AR=1 and TR=0.3, and the value of λ is near 43%.

??tr	????λ	??0.9	??0.95	??1	??1.05	??1.1	??1.15	??1.2	??1.25
										??0.1	?47.51％	??2.24％	??2.16％	??2.16％	??2.24％	??2.31％	??2.19％	??2.22％	??2.34％
??0.2	?45.05％	??1.59％	??1.61％	??1.56％	??1.57％	??1.50％	??1.53％	??1.66％	??1.85％
										??0.3	?42.66％	??1.47％	??1.30％	??1.18％	??1.21％	??1.23％	??1.29％	??1.43％	??1.59％
??0.4	?40.37％	??1.32％	??1.23％	??1.24％	??1.29％	??1.25％	??1.29％	??1.38％	??1.50％
										??0.5	?38.20％	??1.48％	??1.44％	??1.48％	??1.54％	??1.56％	??1.58％	??1.60％	??1.76％

The advantage of trapezoidal transducer is that transducer can be installed along the connecting line at the center that is positioned at weight/mass, rather than installs along the connecting line that is positioned at line of symmetry.Such transducer has the advantage of improving modal distribution, and does not have the imbalance on the inertia.The methods that used two kinds in front are compared select 270 degree to 300 degree as the optimum orientation angle.

The used transducer of the present invention can be counted as relevant with the distribution pattern panel, and for example described in the WO97/09842, wherein the design object of transducer is a distribution pattern.

Claims (26)

1. the touch pad component that is used for electronic product, this assembly comprises that a touch pad, is used for touch pad is mechanically connected to the connector and a transducer of electronic product casing, described transducer be installed on this connector by a coupling arrangement or on the touch pad to drive this shell as acoustic radiator.

2. touch pad component according to claim 1 is characterized in that described connector is a form around the frame of touch pad periphery.

3. touch pad component according to claim 2 is characterized in that described transducer is installed on the described frame.

4. according to each the touch pad component in the claim 1 to 3, it is characterized in that transducer has the operating frequency range of expectation and comprises resonant element, this resonant element has a mode frequency and distributes in operating frequency range.

5. touch pad component according to claim 4 is characterized in that coupling arrangement is installed on the resonant element in the position that helps the effect of resonant element mode is coupled on connector or the touch pad.

6. according to claim 4 or 5 described touch pad components, the parameter that it is characterized in that the selective resonance element is to strengthen the mode profile of resonant element in operating frequency range.

7. touch pad component according to claim 6, it is characterized in that first pattern by guaranteeing resonant element near the lowest operating frequency of needs to strengthen described distribution.

8. according to claim 6 or 7 described touch pad components, it is characterized in that having one by the mode profile of guaranteeing described resonant element enough provides a pattern density with the substantially invariable effective mean force of frequency to strengthen the mode profile of resonant element concerning active member.

9. according to each the touch pad component in the claim 6 to 8, it is characterized in that by on frequency substantially equably distributed resonance flexural wave pattern strengthen described mode profile.

10. according to each the touch pad component in the claim 6 to 9; it is characterized in that resonant element carries out modelling along two basic vertical axles; have relevant base frequency at each, and, adjust two relevant base frequency ratios for reaching best modal distribution.

11. touch pad component according to claim 10, the ratio that it is characterized in that two base frequencies is 9: 7.

12. according to each the touch pad component in the claim 4 to 11, it is characterized in that transducer comprises a plurality of resonant elements, each resonant element has a mode profile, the pattern of resonant element is arranged to staggered in operating frequency range, strengthens the mode profile as the transducer of a single unit system.

13. touch pad component according to claim 12 is characterized in that resonant element is coupled at the Coupling point place that can strengthen the transducer pattern.

14., it is characterized in that strengthening the mode profile of each transducer by optimizing the basic resonance frequency ratio of each resonant element according to claim 12 or 13 described touch pad components.

15. each the touch pad component according in the claim 4 to 14 is characterized in that resonant element is a plate-like.

16. each the touch pad component according in the claim 4 to 15 is characterized in that the selection of the shape of resonant element is selected: beam shape, trapezoidal, oval, substantially dish type or rectangle from following one group.

17., it is characterized in that transducer comprises at least one initiatively resonant element according to each the touch pad component in the claim 4 to 16.

18., it is characterized in that transducer comprises initiatively resonant element of at least one passive resonant element and according to each the touch pad component in the claim 4 to 16.

19. an electronic product comprises a main body, and the described touch pad component of above-mentioned arbitrary claim is installed in main body or on the main body.

20. electronic product according to claim 19 is characterized in that described transducer drives touch pad simultaneously and around the main body of touch pad, main body exported as elementary acoustic radiator generation sound.

21. electronic product according to claim 20 is characterized in that comprising that at least one is installed in the additional transducers on the main body.

22. electronic product, comprise a main body, bending wave loudspeaker is installed in main body or on the main body, described loudspeaker comprises that flexural wave acoustic radiator and the motor machine power transducer that is installed on the acoustic radiator export with generation sound, it is characterized in that described transducer has the operating frequency range of an expectation, and comprise a coupling arrangement that in operating frequency range, has the resonant element of mode frequency distribution and this transducer is connected to radiator.

23. electronic product according to claim 22 is characterized in that this coupling arrangement is helping that the position that the effect of resonant element mode is coupled on the radiator is installed on the resonant element.

24., it is characterized in that this acoustic radiator and main body are Unitarily molded according to claim 22 or 23 described electronic products.

25., it is characterized in that in order to strengthen the mode profile of the resonant element in the operating frequency range, the parameter of selective resonance element according to the described electronic product of arbitrary claim in the claim 22 to 24.

26. according to the described electronic product of arbitrary claim in the claim 19 to 25, they are disposable.

Images