CN106199615A - Piezoelectric ceramic piece and there is the ultrasonic sensor of this piezoelectric ceramic piece - Google Patents
Piezoelectric ceramic piece and there is the ultrasonic sensor of this piezoelectric ceramic piece Download PDFInfo
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- CN106199615A CN106199615A CN201610818217.2A CN201610818217A CN106199615A CN 106199615 A CN106199615 A CN 106199615A CN 201610818217 A CN201610818217 A CN 201610818217A CN 106199615 A CN106199615 A CN 106199615A
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- piezoelectric ceramic
- ceramic piece
- ultrasonic sensor
- metal shell
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- 239000000919 ceramic Substances 0.000 title claims abstract description 48
- 229910052751 metal Inorganic materials 0.000 claims description 31
- 239000002184 metal Substances 0.000 claims description 31
- 230000001953 sensory effect Effects 0.000 claims description 28
- 230000002093 peripheral effect Effects 0.000 claims description 20
- 230000010412 perfusion Effects 0.000 claims description 10
- 241000237983 Trochidae Species 0.000 claims description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 3
- 239000000741 silica gel Substances 0.000 claims description 3
- 229910002027 silica gel Inorganic materials 0.000 claims description 3
- 230000005611 electricity Effects 0.000 claims description 2
- 238000009434 installation Methods 0.000 claims 1
- 230000000630 rising effect Effects 0.000 claims 1
- 238000007789 sealing Methods 0.000 claims 1
- 230000035945 sensitivity Effects 0.000 abstract description 11
- 238000002604 ultrasonography Methods 0.000 description 18
- 238000001514 detection method Methods 0.000 description 11
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 229910052709 silver Inorganic materials 0.000 description 2
- 239000004332 silver Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 241001465754 Metazoa Species 0.000 description 1
- 229920002472 Starch Polymers 0.000 description 1
- 238000003854 Surface Print Methods 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 230000030279 gene silencing Effects 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 210000003739 neck Anatomy 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 239000011236 particulate material Substances 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 229910052573 porcelain Inorganic materials 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000009417 prefabrication Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 235000019698 starch Nutrition 0.000 description 1
- 230000002463 transducing effect Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S15/00—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
- G01S15/88—Sonar systems specially adapted for specific applications
- G01S15/93—Sonar systems specially adapted for specific applications for anti-collision purposes
- G01S15/931—Sonar systems specially adapted for specific applications for anti-collision purposes of land vehicles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
- B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
- B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
- B06B1/02—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy
- B06B1/06—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/52—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S15/00
- G01S7/521—Constructional features
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N30/00—Piezoelectric or electrostrictive devices
- H10N30/80—Constructional details
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S15/00—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
- G01S15/88—Sonar systems specially adapted for specific applications
- G01S15/93—Sonar systems specially adapted for specific applications for anti-collision purposes
- G01S15/931—Sonar systems specially adapted for specific applications for anti-collision purposes of land vehicles
- G01S2015/932—Sonar systems specially adapted for specific applications for anti-collision purposes of land vehicles for parking operations
Landscapes
- Engineering & Computer Science (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Physics & Mathematics (AREA)
- Computer Networks & Wireless Communication (AREA)
- General Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Acoustics & Sound (AREA)
- Transducers For Ultrasonic Waves (AREA)
Abstract
The present invention provides a kind of piezoelectric ceramic piece, including plate body, described plate body is rectangle laminated structure, and a length of 6mm 7mm of plate body, width be 5mm 6mm, thickness be 0.1mm 0.15mm, it is formed with anelectrode and negative electrode on the surface of described plate body, between described anelectrode and described negative electrode, is provided with insulating tape.The present invention also provides for the ultrasonic sensor with described piezoelectric ceramic piece.Ultrasonic sensor of the present invention by being designed as rectangle laminated structure by piezoelectric ceramic piece, improve the sensitivity of sensor, ensure that the normal range finding of sensor is the most disturbed, secondly, two electrodes in this ultrasonic sensor are both formed on piezoelectric ceramic piece, and be connected with power supply by electrode pin, to improve the stability of sensor.
Description
Technical field
The present invention relates to a kind of detection device, particularly relate to a kind of piezoelectric ceramic piece and there is the ultrasonic of this piezoelectric ceramic piece
Wave sensor.
Background technology
Ultrasonic sensor is the sensor utilizing the characteristic of ultrasound wave to develop.Ultrasound wave is that a kind of frequency of vibration is high
In the mechanical wave of sound wave, transducing wafer occur vibration to produce under the excitation of voltage, it has, and frequency is high, wavelength is short, around
Penetrate phenomenon little, particularly good directionality, ray can be become and the features such as direction propagation.Liquid, solid are penetrated by ultrasound wave
Ability is very big, and especially in the opaque solid of sunlight, it can penetrate the degree of depth of tens meters.Ultrasound wave encounters impurity or boundary
Face can produce significantly to reflect to form and be reflected into echo, encounters live animal physical ability and produces Doppler effect.Ultrasound examination extensively should
It is used in the aspects such as industry, national defence, biomedicine, is particularly useful for automobile automated parking system.Using ultrasound wave as detection means, must
Must produce ultrasound wave and receive ultrasound wave, the device completing this function is exactly ultrasonic sensor, the most ultrasonic changes
Energy device, or ultrasonic probe, ultrasonic sensor mainly includes metal shell and the piezoelectric chip being arranged in metal shell
(i.e. piezoelectric ceramic piece), piezoelectric chip both can launch ultrasound wave, it is also possible to receives ultrasound wave.
Piezoelectric ceramic piece many employings disc-shaped structure in existing ultrasonic sensor, Oscillation Amplitude when producing ultrasound wave
And frequency of vibration is more weak, and then the sensitivity of reduction ultrasonic sensor, affect this ultrasonic sensor and be applied to automobile certainly
The detection degree of accuracy of dynamic parking system detection range；Secondly, the electrode in existing ultrasonic sensor and piezoelectric ceramic piece
Connect, another electrode is connected with metal shell, and this structural stability is poor, generation ultrasound wave time, interference free performance is weak, noise relatively
Greatly, so reduce ultrasonic sensor sensitivity.Existing ultrasonic sensor can meet to be applied when reversing automobile, passes through
Ultrasonic sensor sensing detection reversing safe distance.But for when automobile lane change, for the nearest automobile in rear due to
There is a visual angle blind zone in rearview mirror, is difficult to observe that the vehicle pressed close to is driven fast very much at rear, so, easily causes two car collisions and occur
Security incident, therefore, vapour window side is installed a high sensing that is used for of detection sensitivity and is pressed close to vehicle to remind lane change safety
Ultrasonic sensor is a practical product of real need.
Summary of the invention
In view of the above, the present invention is necessary that providing a kind of improves the piezoelectric ceramic piece that detection sensitivity is high.
The technical scheme that the present invention provides is as follows: a kind of piezoelectric ceramic piece, including plate body, described plate body is rectangle lamellar
Structure, and a length of 6mm-7mm of plate body, width be 5mm-6mm, thickness be 0.1mm-0.15mm, on the surface of described plate body
It is formed with anelectrode and negative electrode, between described anelectrode and described negative electrode, is provided with insulating tape.
Further, a length of 6.5mm of described plate body, width be 5.5mm, thickness be 0.12mm.
It addition, the present invention is necessary to provide a kind of ultrasonic sensor with described piezoelectric ceramic piece.
A kind of ultrasonic sensor, including housing and the sensory package that is arranged in housing, described sensory package includes
Metal shell, the piezoelectric ceramic piece being arranged in metal-back, two electrode pins being connected on piezoelectric ceramic piece, it is arranged on metal
The perfusion layer that noise reduction layer in housing and envelope are filled in metal shell.
Further, described noise reduction layer is arranged in metal shell, and covers on piezoelectric ceramic piece, and noise reduction layer is noise reduction
Sponge.
Further, described housing is formed with a containing cavity, and sensory package is arranged on described accommodating by a rubber washer
Intracavity, metal shell includes diapire and the sidewall being formed on diapire, and it is protruding that side wall ends is formed with two clampings, described rubber cushion
Circle is arranged on two clamping high spots of metal shell, and each described clamping projection extends the most laterally along side wall ends, two cards
Hold the protruding centrage about sidewall symmetrical.
Further, described diapire is discoideus structure, diapire is formed clamping chamber, is fastened on for piezoelectric ceramic piece
On diapire.
Further, described perfusion layer envelope is filled in metal shell, and seals up described noise reduction layer, and described perfusion layer uses
Silica gel, and irrigate the outer surface of layer and the side wall ends keeping parallelism of metal shell.
Further, described housing include body, body include mounting shell and be formed on mounting shell outer peripheral face insert
Joint, mounting shell is provided with jointing, and connection-peg includes that plug, plug are connected with jointing accordingly, and two electrodes draw
One end correspondence of foot is connected on anelectrode and the negative electrode of piezoelectric ceramic piece, and the other end of two electrode pins is with jointing even
Connect.
Further, described housing includes the top shell being arranged on body upper part and is removably disposed in body lower part
Drain pan, mounting shell includes assembly wall, and some buckle is equidistantly distributed on the outer peripheral face of assembly wall, in order to install described drain pan,
Drain pan includes end wall and the linking arm being formed on end wall, and linking arm offers the card matched with the buckle on assembly wall
Groove, the diapire outer face of the inner surface of end wall and sensory package against.
Further, described mounting shell includes the perisporium being formed on assembly wall and is formed at assembly wall and is connected with perisporium
Place supports wall, and assembly wall and support and form described containing cavity between wall, supports wall in order to support sensory package, supports on wall
Offering through hole, for being connected with jointing through through hole of two electrode pins in sensory package, it is right to support on wall bottom surface
Being formed with two positioning convex with claiming, in order to position sensory package, every positioning protrusion is along supporting the bottom surface of wall to assembly wall
End extends and parallel with assembly wall end.
Compared with prior art, ultrasonic sensor of the present invention is tied by piezoelectric ceramic piece is designed as rectangle lamellar
Structure, reduces the detection blind area of sensor, improves the sensitivity of sensor, it is ensured that the normal range finding of sensor is the most disturbed, secondly,
Two electrodes in this ultrasonic sensor are both formed on piezoelectric ceramic piece, and are connected with power supply by electrode pin, to improve
The stability of sensor.
Accompanying drawing explanation
Fig. 1 is the overall structure schematic diagram of ultrasonic sensor of the present invention；
Fig. 2 is the decomposition texture schematic diagram of ultrasonic sensor of the present invention；
Fig. 3 is the structural representation at another visual angle of the body in Fig. 2 middle shell；
Fig. 4 is the longitudinal cross-section view of sensory package in Fig. 1；
Fig. 5 is the topology view of piezoelectric ceramic piece in Fig. 4.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Describe, it is clear that described embodiment is only a part of embodiment of the present invention rather than whole embodiments, not wholely
In the case of conflict, the embodiment in the application and the feature in embodiment can be mutually combined, below with reference to the accompanying drawings and tie
Close embodiment and describe the present invention in detail.
Refer to shown in Fig. 1, Fig. 2, a kind of ultrasonic sensor, pacify for automobile automated parking system or lane change spacing
Entirely monitor system, to realize ultrasonic listening distance, including housing 10 and the sensory package 20 that is arranged in housing 10.
Referring to Fig. 2, Fig. 3, housing 10 includes body 11, the top shell 13 being arranged on body 11 top and is arranged on body
The drain pan 12 of 11 bottoms.Body 11 includes mounting shell 111 and is formed at the connection-peg 112 on mounting shell 111 outer peripheral face.
Mounting shell 111 is tubular structure, in order to install sensory package 20.Mounting shell 111 includes lower peripheral wall 1111, is formed at
Upper perimeter wall 1112 in lower peripheral wall 1111 and be formed at lower peripheral wall 1111 and upper perimeter wall 1112 junction support wall 1113, and
Lower peripheral wall 1111 and supporting forms a containing cavity (figure is not marked) between wall 1113, in order to accommodating sensory package 20；Lower peripheral wall 1111
Outer peripheral face on be formed with some buckles 1114, in order to install drain pan 12, in the present embodiment, buckle 1114 is 3 and equidistantly
It is distributed in lower peripheral wall 1111 on outer peripheral face；The inner peripheral surface of upper perimeter wall 1112 is provided with jointing 1117, jointing 1117
One end be connected with connection-peg 112, the other end of jointing 1117 connects for sensory package 20；Support wall 1113 in order to support
Hold sensory package 20, support and on wall 1113, offer through hole 1115, be connected with jointing 1117 for sensory package 20, support
Wall 1113 is formed with positioning convex 1116 on bottom surface, in order to position sensory package 20, prevents sensory package 20 at mounting shell 10
Inside moving back and forth, to improve the sensitivity of sensor, positioning convex 1116 is two and is symmetrically formed at and supports wall 1113 end
On face, every positioning protrusion 1116 along support the bottom surface of wall 1113 extend to lower peripheral wall 1111 end and with lower peripheral wall 1111 end
Parallel.
Connection-peg 112 forms on upper perimeter wall 1112 outer peripheral face of mounting shell 111, in order to the external circuit board even
Connecing, to ensure the normal work of sensor, specifically, connection-peg 112 includes grafting shell 1121 and is arranged on grafting shell 1121
In plug (not shown), plug jointing 1117 with upper perimeter wall 1112 inner peripheral surface accordingly is connected, plug in order to electricity
Road plate connects.
Drain pan 12 is detachably connected in the lower peripheral wall 1111 of body 11, to facilitate, sensory package 20 is encapsulated or is torn open
Under, specifically, drain pan 12 includes end wall 121 and the linking arm 122 being formed on end wall 121, linking arm 122 offers with
The draw-in groove 1221 that buckle 1114 in lower peripheral wall 1111 matches, so that the next week being arranged on body 11 bottom that drain pan 12 is compact
On wall 1111, and the outer face of the inner surface of end wall 121 and sensory package 20 against, to improve the steady of sensory package 20 further
Qualitative.
Top shell 13 lid is located at upper perimeter wall 1112 top of body 11.
Referring to Fig. 2, Fig. 4, sensory package 20 is arranged in the containing cavity of body 11, and by drain pan 12 by sensory package
20 fix, and in the present embodiment, sensory package 20 is arranged in the containing cavity of housing 10 by a rubber washer 30, to improve sensing
The shock resistance of assembly 20 and stability.Sensory package 20 penetrates ultrasound wave in order to receive and dispatch, sensory package 20 include metal shell 21,
The piezoelectric ceramic piece 22, two electrode pins 23 being connected on piezoelectric ceramic piece 22 that are arranged in metal-back 21, it is arranged on metal
The perfusion layer 25 that noise reduction layer 24 in housing 21 and envelope are filled in metal shell 21.
Metal shell 21 uses the aluminum alloy materials of corrosion resistance to make, and metal shell 21 is one end open, another end seal
The shell-like structure closed, including diapire 211 and the sidewall 212 that is formed on diapire 211, diapire 211 is discoideus structure, diapire
It is formed with clamping chamber (figure is not marked) on 211, is fastened on the clamping intracavity of diapire 211 for piezoelectric ceramic piece 22, in the present embodiment,
Clamping chamber is rectangular cavity.When being arranged in drain pan 12, the outer face of diapire 211 is resisted against at end wall 121 inner surface of drain pan 12,
To improve stability；Sidewall 212 is formed on diapire 211, is formed with two clampings protruding outside sidewall 212 end
2121, rubber gasket 30 is arranged at two clampings protruding 2121 outside metal shell 21, to facilitate rubber washer 30 to be fastened on gold
Belong on housing 21, and then metal shell 21 is held in housing 10.In the present embodiment, each clamping projection 2121 is along sidewall
212 end vertical extend laterally, and two clamping projections 2121 are symmetrical about the centrage of sidewall 212.
Piezoelectric ceramic piece 22 is attached on the surface in the clamping chamber on diapire 211, penetrates ultrasound wave in order to receive and dispatch, piezoelectric ceramics
Mechanical energy can mutually be changed by sheet 22 with electric field energy, and specifically, when loading alternating signal, piezoelectric ceramic piece 22 stretches and drives
The diapire 211 of metal shell 21 vibrates, and sends the pulse ultrasonic wave of synchronization along with the promotion of pulse signal.Incorporated by reference to refering to figure
5, piezoelectric ceramic piece 22 includes that plate body 224, plate body 224 are rectangle laminated structure, a length of 6mm-7mm of plate body 224, width
It is 0.1mm-0.15mm for 5mm-6mm, thickness, it is preferable that a length of 6.5mm of plate body 224, width are 5.5mm, thickness is
0.12mm, can improve the sensitivity of sensor；Anelectrode 221 and negative electrode 222, anelectrode it is formed with on the surface of plate body 224
Insulating tape 223 it is provided with between 221 and negative electrode 222.
Piezoelectric ceramic piece 22 is prepared via a method which:
Step 1: dispensing, weighs some raw materials by formula proportion；
Step 2: mixed grinding, by levigate for the various raw material blendings in step 1；
Step 3: granulating and forming, forms the granule of highdensity good fluidity by the powder of the mix homogeneously of step 2, and will
The particulate material pressure made forms the blank of required prefabrication size；
Step 4: sintering, blank step 3 made sinters with the elevated-temperature seal of 1200 DEG C to 1300 DEG C in batch-type furnace
Become porcelain, be incubated 50 minutes to 60 minutes, and furnace cooling；
Step 5: silver ink firing polarizes, starches the potsherd surface printing silver of step 4 sinter molding, is placed in heating furnace, rises
Temperature to 700 DEG C to 800 DEG C, insulation 9 minutes to 12 minutes, be cooled to room temperature, poling temperature is 100 DEG C, and the polarization time is 15 points
Clock, polarized electric field is 3KV/mm, to form anelectrode 221 and negative electrode 222.
Referring to Fig. 4, one end correspondence of two electrode pins 23 is connected to the anelectrode 221 of piezoelectric ceramic piece 22 with negative
On electrode 222, the other end of two electrode pins 23 is connected through through hole 1115 with jointing 1117, improves stablizing of sensor
Property, it is ensured that the normal work of piezoelectric ceramic piece 22.
Noise reduction layer 24 is arranged in metal shell 21, and covers on piezoelectric ceramic piece 22, in order to piezoelectric ceramic piece 22
Damping and silencing, specifically, after there is dither in piezoelectric ceramic piece 22, can be to radiating surface (diapire 211 of metal shell 21) side
To sending ultrasound wave, it is achieved the function of detection range, but the most also can produce ultrasonic signal to radiating surface opposite direction, in order to not
The ultrasound wave affecting radiating surface normally works, and the reciprocal ultrasound wave of radiating surface must eliminate, and this noise reduction layer 24 can absorb radiation
The reciprocal ultrasound wave in face, it is ensured that the normal range finding of sensor is the most disturbed.In the present embodiment, noise reduction layer 24 is noise reduction sponge.
Perfusion layer 25 envelope is filled in metal shell 21, and seals up noise reduction layer 24, to improve the waterproof and dustproof of sensor
Can, and improve the sensitivity of sensor further.Perfusion layer 25 uses silica gel, and irrigates outer surface and the metal shell 21 of layer 25
Sidewall 212 end keeping parallelism.
The connection-peg 112 of this ultrasonic sensor is connected with power supply, and when lane change enters blind area, sensor loads alternation letter
Number, piezoelectric ceramic piece 22 stretches and dither occurs, and then drives the diapire 211 of metal shell 21 to vibrate, and along with pulse
The promotion of signal sends the pulse ultrasonic wave of synchronization to diapire 211 direction, it is achieved the function of detection range, but simultaneously also can be the end of to
Wall 211 opposite direction produces ultrasonic signal, and this ultrasonic signal is absorbed by noise reduction layer 24, and the vibration to diapire 211 was carried out
Filter, effectively to reduce the aftershock of sensor, reduces the detection blind area of sensor, improves the sensitivity of sensor, it is ensured that sensor
Normal range finding the most disturbed, improve the security performance of automobile.
In sum, ultrasonic sensor of the present invention, by piezoelectric ceramic piece is designed as rectangle laminated structure, improves
The sensitivity of sensor, it is ensured that the normal range finding of sensor is the most disturbed, secondly, the two equal shapes of electrode in this ultrasonic sensor
Become on piezoelectric ceramic piece, and be connected with power supply, to improve the stability of sensor by electrode pin.
The foregoing is only embodiments of the invention, not thereby limit the scope of the claims of the present invention, every utilize this
Equivalent structure or equivalence flow process that bright description is made convert, or are directly or indirectly used in other relevant technology necks
Territory, is the most in like manner included in the scope of patent protection of the present invention.
Claims (10)
1. a piezoelectric ceramic piece, including plate body (224), it is characterised in that: described plate body (224) is rectangle laminated structure,
And a length of 6mm-7mm of plate body (224), width be 5mm-6mm, thickness be 0.1mm-0.15mm, the table of described plate body (224)
It is formed with anelectrode (221) and negative electrode (222) on face, is provided with between described anelectrode (221) and described negative electrode (222) absolutely
Marginal zone (223).
Piezoelectric ceramic piece the most according to claim 1, it is characterised in that: a length of 6.5mm of described plate body (224), width
Degree is 0.12mm for 5.5mm, thickness.
3. a ultrasonic sensor, including housing (10) and the sensory package (20) that is arranged in housing (10), described biography
Sense assembly (20) includes metal shell (21), the piezoelectric ceramic piece (22) that is arranged in metal-back (21), be connected to piezoelectric ceramics
Two electrode pins (23) on sheet (22), the noise reduction layer (24) being arranged in metal shell (21) and envelope are filled in metal shell
(21) the perfusion layer (25) in, it is characterised in that: described piezoelectric ceramic piece (22) is the pressure described in any one of claim 1 to 2
Electroceramics sheet.
Ultrasonic sensor the most according to claim 3, it is characterised in that: described noise reduction layer (24) is arranged on metal shell
(21) in, and covering on piezoelectric ceramic piece (22), noise reduction layer (24) is noise reduction sponge.
Ultrasonic sensor the most according to claim 3, it is characterised in that: described housing (10) is formed with a containing cavity,
Sensory package (20) is arranged in described containing cavity by a rubber washer (30), metal shell (21) include diapire (211) with
And the sidewall (212) being formed on diapire (211), it is protruding (2121) that sidewall (212) end is formed with two clampings, described rubber gasket
(30) being arranged on two protruding (2121) places of clampings of metal shell (21), each described clamping protruding (2121) is along sidewall (212)
End vertical extends laterally, and two clampings protruding (2121) are symmetrical about the centrage of sidewall (212).
Ultrasonic sensor the most according to claim 5, it is characterised in that: described diapire (211) is discoideus structure, the end
Wall is formed with clamping chamber on (211), is fastened on diapire (211) for piezoelectric ceramic piece (22).
Ultrasonic sensor the most according to claim 5, it is characterised in that: described perfusion layer (25) envelope is filled in metal shell
(21) in, and sealing up described noise reduction layer (24), described perfusion layer (25) uses silica gel, and the outer surface of perfusion layer (25) is with golden
Belong to sidewall (212) the end keeping parallelism of housing (21).
Ultrasonic sensor the most according to claim 5, it is characterised in that: described housing (10) includes body (11), this
Body (11) includes mounting shell (111) and the connection-peg (112) being formed on mounting shell (111) outer peripheral face, on mounting shell (111)
Being provided with jointing (1117), connection-peg (112) includes plug, and plug is connected with jointing (1117) accordingly, two electricity
One end correspondence of pole pin (23) is connected on anelectrode (221) and the negative electrode (222) of piezoelectric ceramic piece (22), and two electrodes draw
The other end of foot (23) is connected with jointing (1117).
Ultrasonic sensor the most according to claim 8, it is characterised in that: described housing (10) includes being arranged on body
(11) top shell (13) on top and be removably disposed in the drain pan (12) of body (11) bottom, mounting shell (111) includes peace
Dress wall (1111), is equidistantly distributed some buckles (1114), in order to install described drain pan on the outer peripheral face of assembly wall (1111)
(12), drain pan (12) includes end wall (121) and the linking arm (122) being formed on end wall (121), and linking arm is opened on (122)
It is provided with the draw-in groove (1221) matched with the buckle (1114) on assembly wall (1111), the inner surface of end wall (121) and sensing group
Diapire (211) outer face of part (20) against.
Ultrasonic sensor the most according to claim 9, it is characterised in that: described mounting shell (111) includes being formed at peace
Perisporium (1112) on dress wall (1111) and be formed at assembly wall (1111) and perisporium (1112) junction support wall
(1113), and assembly wall (1111) and support and form described containing cavity between wall (1113), support wall (1113) in order to support biography
Sense assembly (20), supports and offers through hole (1115) on wall (1113), for two electrode pins (23) in sensory package (20)
Be connected through through hole (1115) with jointing (1117), support and on wall (1113) bottom surface, be asymmetrically formed two convexes
Rising (1116), in order to position sensory package (20), every positioning protrusion (1116) is along supporting the bottom surface of wall (1113) to installation
Wall (1111) end extends and parallel with assembly wall (1111) end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610818217.2A CN106199615A (en) | 2016-09-12 | 2016-09-12 | Piezoelectric ceramic piece and there is the ultrasonic sensor of this piezoelectric ceramic piece |
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Application publication date: 20161207 |