CN1303522A - Resonant piezoelectric alering device - Google Patents
Resonant piezoelectric alering device Download PDFInfo
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- CN1303522A CN1303522A CN99806807A CN99806807A CN1303522A CN 1303522 A CN1303522 A CN 1303522A CN 99806807 A CN99806807 A CN 99806807A CN 99806807 A CN99806807 A CN 99806807A CN 1303522 A CN1303522 A CN 1303522A
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- piezoelectric
- alering
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- 238000013016 damping Methods 0.000 claims abstract description 12
- 239000000758 substrate Substances 0.000 claims description 12
- 239000000696 magnetic material Substances 0.000 claims description 7
- 238000004519 manufacturing process Methods 0.000 claims description 7
- 238000006073 displacement reaction Methods 0.000 claims description 6
- 239000002184 metal Substances 0.000 claims description 5
- 229910052751 metal Inorganic materials 0.000 claims description 5
- 230000005284 excitation Effects 0.000 claims description 3
- 239000003302 ferromagnetic material Substances 0.000 claims description 3
- 230000005291 magnetic effect Effects 0.000 claims 1
- 238000007789 sealing Methods 0.000 claims 1
- 239000011241 protective layer Substances 0.000 description 8
- 230000003068 static effect Effects 0.000 description 7
- 230000010355 oscillation Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 238000004891 communication Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 210000000707 wrist Anatomy 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000000638 stimulation Effects 0.000 description 1
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Classifications
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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
- G10K9/12—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers electrically operated
- G10K9/122—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers electrically operated using piezoelectric driving means
-
- G—PHYSICS
- G04—HOROLOGY
- G04G—ELECTRONIC TIME-PIECES
- G04G13/00—Producing acoustic time signals
- G04G13/02—Producing acoustic time signals at preselected times, e.g. alarm clocks
- G04G13/021—Details
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Apparatuses For Generation Of Mechanical Vibrations (AREA)
- General Electrical Machinery Utilizing Piezoelectricity, Electrostriction Or Magnetostriction (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
A resonant piezoelectric alerting device (600) includes a motional mass (130) and a piezoelectric actuator (100) constrained to an actuator mount (132) at a first end and coupled to the motional mass (130) at a second end. The piezoelectric actuator (100) responds to a control signal (108,110) to generate an alternating out-of-plane movement (812,814) of the motional mass (130) having an amplitude (412,414). The alternating out-of-plane movement (812,814) of the motional mass (130) is transformed into tactile energy to provide a tactile alert about a resonant frequency (608). The resonant piezoelectric alerting device further includes a damping element (136,156) magnetically coupled to the motional mass (130). The amplitude (412,414) is controlled by the damping element (136,156). The alternating out-of-plane movement (812,814) of the motional mass (130) is also transformed into acoustic energy to provide an audible alert above the resonant frequency (608).
Description
The present invention relates generally to alarm equipment, relate in particular to a kind of resonant piezoelectric alering device.
The sense of touch alarm equipment has been widely used in the electronic equipment so that a kind of sense of touch alarm is provided, it gives the alarm to the user of this electronic equipment sensitively, an incident has taken place, and for example the information of an incident for example is received in a kind of selectable call receiver in the alarm clock.Prior art sense of touch alarm equipment adopts several forms, and the most significant is a kind of motor that the skew balance weight is housed.When these motors were used continuously, they will absorb the power of quite big quantity usually, therefore will limit the working life of this equipment when using battery pack.Motor also takies significant spatial volume, and when the size of this motor can reduce, it was cost with the level of sacrificing issuable sense of touch energy output often that this size reduces.
Non-linear sense of touch alarm equipment is used to replace the motor that resembles the sense of touch alarm equipment.This non-linear sense of touch alarm equipment reduces desired energy significantly so that produce a kind of sense of touch energy of the preset level that is produced, and the result increases the life-span of battery pack.When non-linear sense of touch alarm equipment was modified on motor significantly, this non-linear sense of touch alarm equipment still needed a needed many like that same space of motor.
Need a kind of needs significantly less than the sense of touch alarm equipment in the space of prior art sense of touch alarm equipment.
Need a kind of sense of touch alarm equipment that carries out work with the power consumption that is reduced significantly.
Need a kind of method that is used for controlling the sense of touch energy output that transmits by this sense of touch alarm equipment.
Need a kind of sense of touch alarm equipment that can produce aural warning.
Fig. 1 is a kind of valve that is used for producing by the electronic circuit excitation, switch, the top plan view of the prior art piezoelectric actuator of relay and pump;
Fig. 2 is the sectional drawing of the prior art piezoelectric actuator of claim 1;
Fig. 3 is a kind of illustration of prior art electromechanical work of the piezoelectric actuator that claim 1 is described;
Fig. 4 is the machine drawing of prior art electromechanical work of the piezoelectric actuator of explanation claim 1;
Fig. 5 is the electronic block diagram of drive circuit of the prior art electromechanical work of the explanation piezoelectric actuator that is used for driving claim 1;
Fig. 6 is the plane graph according to resonant piezoelectric alering device of the present invention;
Fig. 7 is the end view according to resonant piezoelectric alering device of the present invention;
Fig. 8 is the work sheet of explanation according to resonant piezoelectric alering device of the present invention;
Fig. 9 is the machine drawing that the work of resonant piezoelectric alering device according to another embodiment of the invention is described;
Figure 10 is the machine drawing of explanation another embodiment of the present invention;
Figure 11 is the machine drawing of explanation another embodiment of the present invention;
Figure 12 is to use the electronic block diagram according to the electronic equipment of resonant piezoelectric alering device of the present invention.
Fig. 1 is used for producing the valve that resembles with electric power excitation, switch, relay, and the top plan view of the prior art piezoelectric actuator 100 of the such equipment of pump.This piezoelectric actuator is here by explaining among the U.S. Patent number NO.5687462 that is published in November, 1997 with reference to the people such as Lazarus that insert.Piezoelectric actuator 100 comprise one 116, one of the flexible substrate shown in the sectional drawing of Fig. 2 have an electronics input 110 that on flexible substrate 116, forms ' first electrode mode 114.First piezoelectric element 104 that is bonded on first electrode mode 114 and the flexible substrate 116.The electronic circuit that this bonding mode is provided between first electrode mode 114 and first piezoelectric element 104 connects.Second electrode mode 106 with an electronics input 110 is formed on the first pliable and tough protective layer 102, and this protective layer provides the electronic circuit ways of connecting also to be bonded in above first piezoelectric element 104 with a kind of being used between second electrode mode 106 and first piezoelectric element 104.Flexible substrate 116, the first electrode modes 114, the second electrode modes 106, the first piezoelectric elements 104, and the first pliable and tough protective layer 102 forms first piezoelectric actuator element 150 of prior art piezoelectric actuator 100.
One have electronics input 108 ' third electrode pattern 118 also on flexible substrate 116, be formed.One second piezoelectric element 120 is bonded in third electrode pattern 118 and above the flexible substrate 116.This adhesive method provides electronic circuit to connect between the third electrode pattern 118 and second piezoelectric element 120.The 4th electrode mode 122 with an electronics input 108 is formed on the second pliable and tough protective layer 124, and this protective layer provides the electronic circuit ways of connecting also to be bonded in above second piezoelectric element 120 with a kind of between the 4th electrode mode 122 and second piezoelectric element 120.Flexible substrate 116, third electrode pattern 118, the four electrode modes 122, the second piezoelectric elements 120, and the second pliable and tough protective layer forms second piezoelectric actuator element 152 of a prior art piezoelectric actuator 100.
Get back to Fig. 1, several installing holes 112 (illustrating wherein two) can make piezoelectric actuator 100 be held onto tightly by an actuator support that will illustrate below 132.For example, as shown in Figure 3, use a control signal first piezoelectric actuator element 150 is bent through overcompression, and second piezoelectric actuator element, 152 stretched being bent.The polarity of control signal can change to such degree, makes that the piezoelectric actuator element of winning is stretched to be bent.And second piezoelectric actuator element resembles with being illustrated in more detail below and is bent through overcompression.
Comprise flexible substrate 116; first electrode mode 114; first piezoelectric element 104; second electrode mode 106; and first piezoelectric actuator element 150 of the first pliable and tough protective layer can encourage by a control signal 110 shown in Figure 5 individually, and this signal has one first polarity so that provide one first to exceed the plane and move 404 at the first direction 412 with respect to static or unperturbed position 402 as shown in Figure 4.First piezoelectric actuator element 150 also can be encouraged by a control signal 110 individually, this signal have one second opposite polarity in case as shown in Figure 4 at one with respect to the second direction 414 of static or unperturbed position 402 or provide one second to exceed the plane and move 408.First exceeds the plane moves 404 and second and exceeds the plane to move 408 be that the straight line of first piezoelectric actuator element moves.
Equally; comprise flexible substrate 116; third electrode pattern 118; second piezoelectric element 120; the 4th electrode mode 122; and second piezoelectric actuator element 152 of the second pliable and tough protective layer 124 can encourage by a control signal 108 as shown in Figure 5 individually, and this signal has one first polarity so that provide one first to exceed the plane and move 404 at the first direction 412 with respect to static or unperturbed position 402 as shown in Figure 4.Second piezoelectric actuator element 152 also can be encouraged by a control signal 108 individually, and this signal has one second opposite polarity so that provide one second to exceed the plane and move 408 in the second direction 414 with respect to static or unperturbed position 402 as shown in Figure 4.First exceeds the plane moves 404 and second and exceeds the plane to move 408 also be that the straight line of second piezoelectric actuator element moves.
When first piezoelectric actuator element 150 is encouraged by a control signal with first polarity, and second piezoelectric actuator element 152 is when being encouraged by a control signal with second opposite polarity simultaneously, produces the 3rd at the first direction 412 with respect to static or unperturbed position 402 as shown in Figure 4 and exceeds the plane and move 406.
When first piezoelectric actuator element 150 is encouraged by a control signal 110 with second opposite polarity and second piezoelectric actuator element 152 when being encouraged by a control signal 108 with first polarity simultaneously, as shown in Figure 4, producing the 4th in the second direction with respect to static or unperturbed position 402 exceeds the plane and moves 410.Should be noted that, as mentioned above, when first piezoelectric actuator element 150 and second piezoelectric actuator element 152 were energized simultaneously, the amplitude that the straight line of the piezoelectric actuator 100 of comparing with first piezoelectric actuator element 150 of independent drive or second piezoelectric actuator element 152 moves was increased.
Fig. 5 is the electronics block diagram of drive circuit 500 of the prior art electromechanical work of the explanation piezoelectric actuator that is used for driving claim 1.Piezoelectric actuator 100 by two independently voltage source drive, first voltage source 502 and second voltage source 506 are placed by series connection.First voltage source 502 and second voltage source 506 are exported about 100 volts of voltages usually so that produce moving of piezoelectric actuator 100.First voltage source 502 and the coupling of first piezoelectric actuator element 150 and produce control signal 110 and reference signal 110 '.Second voltage source 506 and the coupling of second piezoelectric actuator element 152 and produce control signal 108 and reference signal 108 '.The polarity 504 of first voltage source 502 can be oppositely so that in the opposite direction 414 produce moving of first piezoelectric actuator element 150.The polarity of second voltage source 506 can be oppositely so that in the opposite direction 414 produce moving of second piezoelectric actuator element 152.
Fig. 6 is the plane graph according to resonant piezoelectric alering device of the present invention.As shown in Figure 6, this piezoelectric actuator 100 can be modified by additional moving mass expediently.At work, 600 pairs of resonant piezoelectric alering devices by produce be used for forming another described moving mass to exceed the control signal that moves on the plane very sensitive.As will being illustrated below, the plane that exceeds of another moving mass moves through actuator support 132 and is transformed into can be used to provide a sense of touch energy easily in a kind of electronic equipment.This moving mass is metal preferably, for example iron or steel, and kirsite, or plumbous.Obviously other metals also can utilize.The geometry of piezoelectric actuator 100 and moving mass 130 is selected to provide resonance in preset frequency, and this frequency is that the mobile range of moving mass 130 reaches maximum.When this resonant piezoelectric alering device 600 was used in the electronic equipment on a kind of user's of being fixed on the belt, what make moving mass 130 mobilely reached the preset frequency that maximum and sense of touch pulse be passed to user's wrist and is approximately 100Hertz.Use for other, for example when electronic equipment was fixed on user's the wrist, preset frequency usually will be than higher so that pass to the user with identical corresponding sense of touch stimulation.
Fig. 7 is the end view according to resonant piezoelectric alering device 600 of the present invention.Piezoelectric actuator 100 is fixed on the actuator support 132 securely by a retaining element, for example, and a screw 134 that is used for compressing a compressive plate 154.Other fixing means are rivet for example, the nut of engagement bolt, and the hot press law technology also can utilize.
Fig. 8 is the figure of explanation according to the work of resonant piezoelectric alering device 600 of the present invention.When using a kind of piezoelectric actuator of routine, according to the mobile frequency 808 that is limited in being lower than preset frequency 806 of piezoelectric actuator 100 of the present invention.Along with the frequency that drives resonant piezoelectric alering device 600 when the resonance frequency of resonant piezoelectric alering device 600 increases, the mobile range of moving mass will be increased to maximum in preset frequency.Not as conventional piezoelectric actuator, in this exciter,, driving frequency will weaken significantly along with surpassing moving of preset frequency 806 piezoelectric actuators, and the second favourable working method will appear shown in curve 804 like that.Piezoelectric actuator 100 according to the present invention begins to resemble and reacts a kind of diaphragm, makes to produce according to resonant piezoelectric alering device 600 of the present invention to be higher than the frequency of preset frequency so that acoustic energy is provided again.Another kind of working method according to resonant piezoelectric alering device 600 of the present invention will explain below.
Fig. 9 is the machine drawing that the work of resonant piezoelectric alering device according to another embodiment of the invention is described.Be higher than preset frequency or resonance frequency, moving mass 130 plays a part a kind of mechanical box that is connected to actual rigid surface 912, thereby makes the mobile arrival of piezoelectric actuator 100 minimum at free end.Be higher than preset frequency, move on the plane that exceeds that occurs piezoelectric actuator 100 between actuator support 132 and moving mass 130.When not having control signal to be added to the piezoelectric actuator 100 and first piezoelectric actuator element 150 or second piezoelectric actuator element 152 when being energized individually static 902, piezoelectric actuator exceeds in-plane 904 or second first and exceeds in-plane 908 and produce and move.When first piezoelectric actuator element 150 and second piezoelectric actuator element 152 were energized simultaneously, piezoelectric actuator exceeded in-plane 906 or the 4th the 3rd and exceeds in-plane 910 and produce and move.Obviously, the actual mobile range of piezoelectric actuator 100 depends on the amplitude of the control signal that is added.
Figure 10 is the machine drawing of explanation according to a kind of damped harmonic oscillation piezoelectric alering device 1000 of the present invention.Different with resonant piezoelectric alering device discussed above 600, a damping element 136 of the work utilization control piezoelectric actuator 100 of this damped harmonic oscillation piezoelectric alering device 1000 and the relative displacement of moving mass 130, thereby control is exported by the sense of touch energy that damped harmonic oscillation piezoelectric alering device 100 is produced.When moving mass 130 was a ferromagnet, this damping element 136 can be a conventional magnet.The displacement of piezoelectric actuator 100 and moving mass 130 can be controlled by the energy product of magnetic material, and by 138 controls of the spacing between magnet 136 and moving mass 130.Damping element 136 can be utilized to be controlled at the variation in the output of sense of touch energy valuably, and this variation is because the change of parts produces by damped harmonic oscillation piezoelectric alering device 1000.
Obviously, this moving mass 130 can be replaced by a kind of magnetic material, and damping element 136 can be replaced by a kind of ferromagnetic material so, for example seals the inwall of a kind of shell of resonant piezoelectric alering device 1000.
Figure 11 is the electromechanical diagram of another embodiment of explanation damped harmonic oscillation piezoelectric alering device 1000 of the present invention.As shown in figure 11, damping element 136 is replaced by a solenoid 156, and this coil is driven by a signal generator 138.In this case, a kind of magnetic material manufacturing of moving mass 130 usefulness.Resemble discussed abovely, therefore the relative displacement of damping element 136 control piezoelectric actuators 100 and moving mass 130 is controlling the sense of touch energy output that is produced by damped harmonic oscillation piezoelectric alering device 1000.The displacement of piezoelectric actuator 1000 and moving mass 130 is subjected to the control of the energy product of magnetic material, be subjected to the control of the spacing 142 between moving mass 130 and the solenoid 156, and the control that is subjected to signal amplitude, this signal amplitude is the measuring of electric current 140 of solenoid 156 of flowing through.
Figure 12 is the electronics block diagram of utilizing according to a kind of electronic equipment of resonant piezoelectric alering device 600 of the present invention.This electronic equipment 1200 can be any electronic equipment that requires the sense of touch alarm equipment, and is any electronic equipment that requires aural warning equipment.When electronic equipment 1200 is a kind of communication equipment, pager for example, cell phone, or the communication equipment of other forms communications, a receiver 1206 is used to receive the information that sends to this equipment.This receiver 1206 can be used to receive radio frequency signals, and infrared or UV signal perhaps is connected to wired.Any radio signal agreement or wire signal agreement can be utilized, and this depends on the type of employed receiver.A controller 1202 is coupled to receiver 1206, and be used to control the work of electronic equipment 1200, the result provides the function of decoding as to received information, make received information stores, and produce necessary control information so that make the generation of a kind of sense of touch or aural warning effective.Controller 1202 is coupled to a piezoelectric actuator circuit 1204, and this circuit produces the signal of suitable amplitude so that drive above-mentioned resonant piezoelectric alering device 600.The work of this electronic equipment 1200 also can be controlled 1208 by the user and carry out, and this user's control can be used for the alarm that is produced is resetted, or is used for setup parameter, for example alarm time that will produce.
Claims (16)
1. a resonant piezoelectric alering device comprises:
A moving mass; And
A piezoelectric actuator, first end are fixed on the actuator support, and second end is coupled to described moving mass;
Described piezoelectric actuator is very sensitive to a control signal, moves so that produce the plane that alternately exceeds of described moving mass,
Therefore, alternately moving of described moving mass is converted into the sense of touch energy so that an alarm is provided.
2. the resonant piezoelectric alering device of claim 1 comprises that further one is coupled to the damping element of described moving mass with magnetic force, and wherein, the plane that alternately exceeds of described moving mass is moved and had a displacement amplitude, and wherein
The displacement amplitude that moves on the plane that exceeds of described moving mass is controlled to control the sense of touch energy that is transmitted.
3. the resonant piezoelectric alering device of claim 1, wherein said control signal is checker between first polarity and second reversed polarity.
4. the resonant piezoelectric alering device of claim 1, wherein said piezoelectric actuator comprises:
A flexible substrate; And
One first planar piezoelectric element is fixed on first side of described flexible substrate, and has second end that is fixed on the end of first on the described actuator support and is coupled to described moving mass,
Wherein, described first planar piezoelectric element is very sensitive to control signal, moves so that produce the plane that exceeds of a described moving mass.
5. the resonant piezoelectric alering device of claim 3, wherein said piezoelectric actuator further comprises:
Second planar piezoelectric element that is fixed on second side of described flexible substrate, and have first end that is fixed on described actuator support and second end that is coupled to described moving mass,
Wherein, described second planar piezoelectric element is very sensitive so that also being used for producing of described second end of described second planar piezoelectric element exceeds the plane and move to control signal,
Wherein, move on the excitation of described first planar piezoelectric element and described second planar piezoelectric element plane that exceeds that will produce and increase described moving mass.
6. the resonant piezoelectric alering device of claim 5, wherein, described control signal is checker between first polarity and second opposite polarity, and, the first direction that the sensing response has the control signal of first polarity is moved on the described plane that exceeds of wherein said first planar piezoelectric element and described second planar piezoelectric element, and points to second rightabout that response has the control signal of second opposite polarity.
7. the resonant piezoelectric alering device of claim 1, wherein, described moving mass is with a kind of metal manufacturing.
8. the resonant piezoelectric alering device of claim 1, wherein, the described plane that exceeds is moved a straight line that produces described movable block and is moved.
9. the resonant piezoelectric alering device of claim 1, wherein, it is a maximum that described another of described moving mass exceeds the preset frequency that moves in control signal on the plane.
10. the resonant piezoelectric alering device of claim 9, wherein, preset frequency is 100Hertz.
11. the resonant piezoelectric alering device of claim 1, wherein, in above frequency of being scheduled to, move on the additional plane that exceeds that occurs described piezoelectric actuator between described actuator support and described moving mass.
Wherein, generation acoustic energy is moved on the described additional plane that exceeds of described piezoelectric actuator.
12. the resonant piezoelectric alering device of claim 1 further comprises a shell that is used for sealing described moving mass and described piezoelectric actuator.
13. the resonant piezoelectric alering device of claim 12, wherein, described shell is with a kind of metal manufacturing.
14. the resonant piezoelectric alering device of claim 1, wherein, described damping is a shell made from metal, and wherein said moving mass is with a kind of magnetic material manufacturing.
15. the resonant piezoelectric alering device of claim 1, wherein, described moving mass is with a kind of ferromagnetic material manufacturing, and wherein said damping element is with a kind of magnetic material manufacturing.
16. the resonant piezoelectric alering device of claim 1, wherein said moving mass are a kind of magnetic materials, and wherein said damping element is with a kind of ferromagnetic material manufacturing.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US09/087,309 | 1998-05-29 | ||
| US09/087,558 US6078126A (en) | 1998-05-29 | 1998-05-29 | Resonant piezoelectric alerting device |
| US09/087,309 US5945772A (en) | 1998-05-29 | 1998-05-29 | Damped resonant piezoelectric alerting device |
| US09/087,558 | 1998-05-29 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1303522A true CN1303522A (en) | 2001-07-11 |
Family
ID=26776828
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN99806807A Pending CN1303522A (en) | 1998-05-29 | 1999-04-28 | Resonant piezoelectric alering device |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP1088352A1 (en) |
| JP (1) | JP2002517907A (en) |
| KR (1) | KR20010052439A (en) |
| CN (1) | CN1303522A (en) |
| WO (1) | WO1999063604A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102010011047A1 (en) * | 2010-03-11 | 2011-09-15 | Johnson Matthey Catalysts (Germany) Gmbh | bending transducer |
| JP6172971B2 (en) * | 2013-02-27 | 2017-08-02 | オリンパス株式会社 | Driving device and imaging device |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4342936A (en) * | 1980-12-19 | 1982-08-03 | Eastman Kodak Company | High deflection bandwidth product polymeric piezoelectric flexure mode device and method of making same |
| US4387318A (en) * | 1981-06-04 | 1983-06-07 | Piezo Electric Products, Inc. | Piezoelectric fluid-electric generator |
| JPH02240977A (en) * | 1989-03-14 | 1990-09-25 | Toshiba Corp | Displacement generating device |
| JPH039581A (en) * | 1989-06-07 | 1991-01-17 | Jgc Corp | Actuator |
| JPH039519A (en) * | 1989-06-07 | 1991-01-17 | Tosoh Corp | Bending type displacement element |
| US5068567A (en) * | 1990-10-26 | 1991-11-26 | General Electric Company | Apparatus for increasing the recoverable energy of a piezoelectric bender |
| US5514927A (en) * | 1994-02-28 | 1996-05-07 | Motorola, Inc. | Piezoelectric audio transducer |
| US5780958A (en) * | 1995-11-03 | 1998-07-14 | Aura Systems, Inc. | Piezoelectric vibrating device |
-
1999
- 1999-04-28 JP JP2000552724A patent/JP2002517907A/en active Pending
- 1999-04-28 KR KR1020007013453A patent/KR20010052439A/en not_active Application Discontinuation
- 1999-04-28 WO PCT/US1999/009241 patent/WO1999063604A1/en not_active Application Discontinuation
- 1999-04-28 CN CN99806807A patent/CN1303522A/en active Pending
- 1999-04-28 EP EP99924123A patent/EP1088352A1/en not_active Withdrawn
Also Published As
| Publication number | Publication date |
|---|---|
| JP2002517907A (en) | 2002-06-18 |
| EP1088352A1 (en) | 2001-04-04 |
| KR20010052439A (en) | 2001-06-25 |
| WO1999063604A1 (en) | 1999-12-09 |
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