CN112804615B - Method for reducing resonant frequency of bending beam transducer and structure thereof - Google Patents
Method for reducing resonant frequency of bending beam transducer and structure thereof Download PDFInfo
- Publication number
- CN112804615B CN112804615B CN202011603178.7A CN202011603178A CN112804615B CN 112804615 B CN112804615 B CN 112804615B CN 202011603178 A CN202011603178 A CN 202011603178A CN 112804615 B CN112804615 B CN 112804615B
- Authority
- CN
- China
- Prior art keywords
- bending beam
- beam transducer
- rectangular groove
- resonant frequency
- groove
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000005452 bending Methods 0.000 title claims abstract description 61
- 238000000034 method Methods 0.000 title claims abstract description 18
- 239000002184 metal Substances 0.000 claims abstract description 31
- 238000003754 machining Methods 0.000 claims abstract description 20
- 238000011282 treatment Methods 0.000 claims abstract description 15
- 239000011149 active material Substances 0.000 claims abstract description 10
- 238000009434 installation Methods 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
- H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only
- H04R1/28—Transducer mountings or enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means
- H04R1/2807—Enclosures comprising vibrating or resonating arrangements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
- H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only
- H04R1/28—Transducer mountings or enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/44—Special adaptations for subaqueous use, e.g. for hydrophone
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R31/00—Apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2201/00—Details of transducers, loudspeakers or microphones covered by H04R1/00 but not provided for in any of its subgroups
- H04R2201/02—Details casings, cabinets or mounting therein for transducers covered by H04R1/02 but not provided for in any of its subgroups
- H04R2201/029—Manufacturing aspects of enclosures transducers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2231/00—Details of apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor covered by H04R31/00, not provided for in its subgroups
Abstract
The invention belongs to the technical field of resonant frequency of transducers, and particularly relates to a method for reducing resonant frequency of a bending beam transducer and a structure thereof, which are performed under the condition that the external dimension and active material of the bending beam transducer are unchanged, and can cut and buckle a metal vibrating shell in the bending beam transducer; the machining treatment comprises the following specific contents: cutting and buckling groove machining treatment are carried out on the front side wall and the rear side wall of the metal vibration shell to form notch rectangular grooves formed by symmetrical machining treatment on the left side and the right side, a narrow-side connecting shell is formed between the rectangular grooves on the left side and the right side, the following principle is adopted when the cutting part is selected for the metal vibration shell, and under the condition that the external dimension of the energy converter is unchanged from an active material, the metal vibration part in the bending beam energy converter can be subjected to machining treatment such as cutting and buckling groove and the like, so that the compliance of the metal vibration part is greatly improved, and the resonant frequency is reduced.
Description
Technical Field
The invention belongs to the technical field of resonant frequency of transducers, and particularly relates to a method for reducing resonant frequency of a bending beam transducer and a structure thereof.
Background
As a bending beam type transducer widely used in the field of underwater low frequency emission, the main technical problem that limits its development is geometry. The operating frequency of a typical resonant transducer is inversely proportional to the geometry, i.e., the lower the resonant frequency of the transducer, the greater its geometry.
Therefore, when the bending beam transducer is limited by factors such as loading, limiting or high voltage of the mounting platform, and the external dimension and the active material cannot be changed, the resonant frequency of the bending beam transducer still needs to be further reduced, so that the vibration structure of the bending beam transducer needs to be changed.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a method for reducing the resonant frequency of a bending beam transducer and a structure thereof, wherein the resonant frequency of the bending beam transducer depends on the equivalent compliance and the equivalent mass, and the higher the equivalent compliance is, the lower the resonant frequency is. Therefore, under the condition that the external dimension of the transducer is unchanged from that of the active material, the metal vibration part in the bending beam transducer can be subjected to cutting, buckling groove and other machining treatments, so that the compliance of the bending beam transducer is greatly improved, and the resonance frequency is reduced.
The invention is realized by the following technical scheme:
a method for reducing resonance frequency of bending beam transducer, based on the appearance size of the bending beam transducer and active material unchanged, can cut the metal vibration shell in the bending beam transducer, the processing of the buckling groove machine;
the machining treatment comprises the following specific contents:
cutting the front and rear side walls of the metal vibration shell, carrying out buckling groove machining treatment to form a notch rectangular groove symmetrically machined on the left and right sides, forming a narrow-side connecting shell between the rectangular grooves on the left and right sides,
when the metal vibration shell is selected to be cut, the following principle is adopted:
when the rectangular groove is opened, the bottom of the rectangular groove is 10-15cm away from the bottom end installation part of the metal vibration shell, the rectangular groove is cut along the direction from the bottom to the top, the height of the rectangular groove of the buckling groove is 20-30cm, and the width of the rectangular groove is 12-17cm.
Preferably, when the height of the rectangular groove which is formed after the rectangular groove is cut and the groove is machined is 30cm,
wherein,
when the width of the opening is 12cm, the resonance frequency of the bending beam transducer is reduced to 1.30kHz from the original 2kHz, and the emission energy is 93dB.
Preferably, when the height of the rectangular groove which is formed after the rectangular groove is cut and the groove is machined is 30cm,
wherein,
when the width of the opening is 15cm, the resonance frequency of the bending beam transducer is reduced to 1.16kHz from the original 2kHz, and the emission energy is 101dB.
Preferably, when the height of the rectangular groove which is formed after the rectangular groove is cut and the groove is machined is 30cm,
wherein,
when the width of the opening is 17cm, the resonance frequency of the bending beam transducer is reduced to 1.15kHz from the original 2kHz, and the emission energy is 107dB.
Preferably, when the width of the rectangular groove which is formed after the cutting and the groove buckling machining is specifically 17cm,
wherein,
when the opened height is 20cm, the resonance frequency of the bending beam transducer is reduced to 1.10kHz from the original 2kHz, and the emission energy is 101.5dB.
Preferably, when the width of the rectangular groove which is formed after the cutting and the groove buckling machining is specifically 17cm,
wherein,
when the height of the bending beam transducer is 26cm, the resonant frequency of the bending beam transducer is reduced to 1.10kHz from the original 2kHz, and the emission energy is 106.7dB.
The structure for reducing the resonance frequency of the bending beam transducer is a metal vibrating shell structure obtained by the method.
The beneficial effects of the invention are as follows:
the resonance frequency of the bending beam transducer in the invention depends on the equivalent compliance and the equivalent mass, and the higher the equivalent compliance, the lower the resonance frequency. Therefore, under the condition that the external dimension of the transducer is unchanged from that of the active material, the metal vibration part in the bending beam transducer can be subjected to cutting, buckling groove and other machining treatments, so that the compliance of the bending beam transducer is greatly improved, and the resonance frequency is reduced.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a prior art original block diagram of a metal vibration shell of a bending beam transducer in accordance with the present invention;
fig. 2 is a diagram showing the structure of a metal vibration shell of a bending beam transducer after machining.
In the figure: 101-metal vibration shell, 102-rectangular slot, 103-narrow side connection shell, 104-bottom mounting part.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The technical scheme of the invention specifically discloses a method for reducing the resonant frequency of a bending beam transducer, which is based on the fact that the overall dimension and active materials of the bending beam transducer are unchanged, and can be used for cutting and buckling groove machining the metal vibration shell 101 in the bending beam transducer;
the machining treatment comprises the following specific contents:
cutting and buckling groove machining treatment is carried out on the front side wall and the rear side wall of the metal vibration shell 101 to form a notch rectangular groove 102 which is symmetrically machined on the left side and the right side, a narrow-side connecting shell 103 is formed between the rectangular groove 102 on the left side and the right side,
the following principle is adopted when the metal vibration shell 101 is selected to be cut:
when the rectangular groove 102 is opened, the bottom of the rectangular groove 102 is 10 cm to 15cm away from the bottom end mounting part 104 of the metal vibration shell 101, the rectangular groove 102 is cut along the direction from bottom to top, the height of the rectangular groove 102 is 20cm to 30cm, and the width of the rectangular groove is 12cm to 17cm.
Please refer to fig. 2: the technical scheme of the invention also specifically discloses a structure for reducing the resonant frequency of the bending beam transducer, which is a metal vibration shell 101 structure obtained by the method.
Embodiment one:
the embodiment of the invention specifically discloses a method for reducing the resonant frequency of a bending beam transducer, which is based on the fact that the overall dimension and active material of the bending beam transducer are unchanged, and can be used for cutting and buckling a groove in a metal vibration shell 101 in the bending beam transducer;
the machining treatment comprises the following specific contents:
cutting and buckling groove machining treatment is carried out on the front side wall and the rear side wall of the metal vibration shell 101 to form a notch rectangular groove 102 which is symmetrically machined on the left side and the right side, a narrow-side connecting shell 103 is formed between the rectangular groove 102 on the left side and the right side,
the following principle is adopted when the metal vibration shell 101 is selected to be cut:
when the rectangular groove 102 is opened, the bottom of the rectangular groove 102 is 10 cm to 15cm away from the bottom end mounting part 104 of the metal vibration shell 101, the rectangular groove 102 is cut along the direction from bottom to top, the height of the rectangular groove 102 is 20cm to 30cm, and the width of the rectangular groove is 12cm to 17cm.
Please refer to fig. 2: an embodiment of the present invention specifically discloses a structure for reducing the resonant frequency of a bending beam transducer, which is a metal vibration shell 101 structure obtained by the above method.
Specifically, when the height of the rectangular slot 102 is specifically 30cm after the rectangular slot is cut and the slot is machined, and when the width of the rectangular slot is specifically 12cm, the resonant frequency of the bending beam transducer is reduced from original 2kHz to 1.30kHz, and the emission energy is 93dB.
Embodiment two:
in the embodiment, the part which is not described in detail is the same as the first embodiment, when the height of the rectangular slot 102 is 30cm after the rectangular slot is cut and the slot is machined, wherein when the width of the rectangular slot is 15cm, the resonant frequency of the bending beam transducer is reduced from original 2kHz to 1.16kHz, and the emission energy is 101dB.
Embodiment III:
in the embodiment, the parts not described in detail are the same as those of the first embodiment, specifically, when the height of the rectangular slot 102 is specifically 30cm after the rectangular slot is cut and machined, and when the width of the rectangular slot is specifically 17cm, the resonant frequency of the bending beam transducer is reduced from the original 2kHz to 1.15kHz, and the emission energy is 107dB.
Embodiment four:
in the embodiment, the part not described in detail is the same as the first embodiment, specifically, when the width of the rectangular slot 102 is specifically 17cm after the rectangular slot is cut and machined, and when the height of the rectangular slot is specifically 20cm, the resonant frequency of the bending beam transducer is reduced from the original 2kHz to 1.10kHz, and the emission energy is 101.5dB.
Fifth embodiment:
in the embodiment, the part not described in detail is the same as the first embodiment, specifically, when the width of the rectangular slot 102 is specifically 17cm after the rectangular slot is cut and machined, and when the height of the rectangular slot is specifically 26cm, the resonant frequency of the bending beam transducer is reduced from the original 2kHz to 1.10kHz, and the emission energy is 106.7dB.
As can be seen from the specific data of the test resonant frequency and the emission energy of the metal vibration shell 101 structure obtained in the first to fifth embodiments, the resonant frequency of the bending beam transducer in the present invention depends on the equivalent compliance and the equivalent mass, and the higher the equivalent compliance, the lower the resonant frequency. Therefore, under the condition that the external dimension of the transducer is unchanged from that of the active material, the metal vibration part in the bending beam transducer can be subjected to cutting, buckling groove and other machining treatments, so that the compliance of the bending beam transducer is greatly improved, and the resonance frequency is reduced.
The above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (7)
1. A method for reducing the resonance frequency of a bending beam transducer, which is characterized in that the metal vibration shell in the bending beam transducer can be cut and buckled by a groove machining process based on the condition that the external dimension of the bending beam transducer and an active material are unchanged;
the machining treatment comprises the following specific contents:
cutting the front and rear side walls of the metal vibration shell, carrying out buckling groove machining treatment to form a notch rectangular groove symmetrically machined on the left and right sides, forming a narrow-side connecting shell between the rectangular grooves on the left and right sides,
when the metal vibration shell is selected to be cut, the following principle is adopted:
when the rectangular groove is opened, the bottom of the rectangular groove is 10-15cm away from the bottom end installation part of the metal vibration shell, the rectangular groove is cut along the direction from the bottom to the top, the height of the rectangular groove of the buckling groove is 20-30cm, and the width of the rectangular groove is 12-17cm.
2. A method of reducing the resonant frequency of a bending beam transducer according to claim 1,
when the height of the rectangular groove which is formed after the rectangular groove is cut and the buckling groove is machined is 30cm,
wherein,
when the width of the opening is 12cm, the resonance frequency of the bending beam transducer is reduced to 1.30kHz from the original 2kHz, and the emission energy is 93dB.
3. A method of reducing the resonant frequency of a bending beam transducer according to claim 1,
when the height of the rectangular groove which is formed after the rectangular groove is cut and the buckling groove is machined is 30cm,
wherein,
when the width of the opening is 15cm, the resonance frequency of the bending beam transducer is reduced to 1.16kHz from the original 2kHz, and the emission energy is 101dB.
4. A method of reducing the resonant frequency of a bending beam transducer according to claim 1,
when the height of the rectangular groove which is formed after the rectangular groove is cut and the buckling groove is machined is 30cm,
wherein,
when the width of the opening is 17cm, the resonance frequency of the bending beam transducer is reduced to 1.15kHz from the original 2kHz, and the emission energy is 107dB.
5. A method of reducing the resonant frequency of a bending beam transducer according to claim 1,
when the width of the rectangular groove which is formed after the rectangular groove is cut and the buckling groove is machined is 17cm,
wherein,
when the opened height is 20cm, the resonance frequency of the bending beam transducer is reduced to 1.10kHz from the original 2kHz, and the emission energy is 101.5dB.
6. A method of reducing the resonant frequency of a bending beam transducer according to claim 1,
when the width of the rectangular groove which is formed after the rectangular groove is cut and the buckling groove is machined is 17cm,
wherein,
when the height of the bending beam transducer is 26cm, the resonant frequency of the bending beam transducer is reduced to 1.10kHz from the original 2kHz, and the emission energy is 106.7dB.
7. A structure for reducing the resonant frequency of a bending beam transducer, characterized by a metallic vibrating shell structure obtained by the method of any one of claims 1-6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011603178.7A CN112804615B (en) | 2020-12-29 | 2020-12-29 | Method for reducing resonant frequency of bending beam transducer and structure thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011603178.7A CN112804615B (en) | 2020-12-29 | 2020-12-29 | Method for reducing resonant frequency of bending beam transducer and structure thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112804615A CN112804615A (en) | 2021-05-14 |
| CN112804615B true CN112804615B (en) | 2024-02-13 |
Family
ID=75804225
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011603178.7A Active CN112804615B (en) | 2020-12-29 | 2020-12-29 | Method for reducing resonant frequency of bending beam transducer and structure thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112804615B (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002005953A (en) * | 2000-06-22 | 2002-01-09 | Matsushita Electric Ind Co Ltd | Manufacturing method of vibrator for piezoelectric transduction and acceleration sensor equipped with vibrator |
| AT5237U1 (en) * | 2001-05-17 | 2002-04-25 | Avl List Gmbh | BENDING ROCKERS, PREFERABLY TUNING FORK ROCKERS, AND LENGTH EXTENSION ROCKERS FROM A PIEZOELECTRIC MATERIAL |
| CN102169685A (en) * | 2011-03-29 | 2011-08-31 | 哈尔滨工程大学 | Small sized deepwater underwater sound energy transducer with low frequency and broad band |
| CN202135281U (en) * | 2011-07-01 | 2012-02-01 | 歌尔声学股份有限公司 | Electro-acoustic conversion device |
| CN107221316A (en) * | 2017-06-06 | 2017-09-29 | 哈尔滨工程大学 | A kind of broad band low frequency Helmholtz underwater acoustic transducers |
| CN206620277U (en) * | 2016-08-02 | 2017-11-07 | 常州阿木奇声学科技有限公司 | A kind of vibrating diaphragm and the electroacoustic transducer including the vibrating diaphragm |
| CN108493328A (en) * | 2018-01-29 | 2018-09-04 | 北京信息科技大学 | Piezoelectric vibrator, flextensional transducer based on scissoring vibration and flextensional vibration and preparation method thereof |
| CN109935223A (en) * | 2017-12-19 | 2019-06-25 | 北京长城电子装备有限责任公司 | A kind of super-small low frequencies energy converter |
-
2020
- 2020-12-29 CN CN202011603178.7A patent/CN112804615B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002005953A (en) * | 2000-06-22 | 2002-01-09 | Matsushita Electric Ind Co Ltd | Manufacturing method of vibrator for piezoelectric transduction and acceleration sensor equipped with vibrator |
| AT5237U1 (en) * | 2001-05-17 | 2002-04-25 | Avl List Gmbh | BENDING ROCKERS, PREFERABLY TUNING FORK ROCKERS, AND LENGTH EXTENSION ROCKERS FROM A PIEZOELECTRIC MATERIAL |
| CN102169685A (en) * | 2011-03-29 | 2011-08-31 | 哈尔滨工程大学 | Small sized deepwater underwater sound energy transducer with low frequency and broad band |
| CN202135281U (en) * | 2011-07-01 | 2012-02-01 | 歌尔声学股份有限公司 | Electro-acoustic conversion device |
| CN206620277U (en) * | 2016-08-02 | 2017-11-07 | 常州阿木奇声学科技有限公司 | A kind of vibrating diaphragm and the electroacoustic transducer including the vibrating diaphragm |
| CN107221316A (en) * | 2017-06-06 | 2017-09-29 | 哈尔滨工程大学 | A kind of broad band low frequency Helmholtz underwater acoustic transducers |
| CN109935223A (en) * | 2017-12-19 | 2019-06-25 | 北京长城电子装备有限责任公司 | A kind of super-small low frequencies energy converter |
| CN108493328A (en) * | 2018-01-29 | 2018-09-04 | 北京信息科技大学 | Piezoelectric vibrator, flextensional transducer based on scissoring vibration and flextensional vibration and preparation method thereof |
Non-Patent Citations (4)
| Title |
|---|
| Resonant Frequency Control of the Ultrasonic Transducer Using Simulated Inductor;H. Yokozawa et al.;16th International Conference on New Actuators;20180727;433-437 * |
| 圆盘型弯张换能器研究;莫喜平 等;《哈尔滨工程大学学报》;20100715;第31卷(第7期);963-966 * |
| 弯张换能器密排成阵性能的研究;顾汉炳 等;《声学与电子工程》;20190315;5-10 * |
| 级联式变截面压电换能器尺寸对其性能的影响;孟祥迪 等;《陕西师范大学学报(自然科学版)》;20190217;第47卷(第2期);51-56 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112804615A (en) | 2021-05-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Randall et al. | An alternative to compactification | |
| JP4572807B2 (en) | Mesa-type piezoelectric vibrating piece | |
| JP5613972B2 (en) | Unidirectional electrical steel sheet with excellent iron loss characteristics | |
| BG105261A (en) | Panel form acoustic apparatus using bending waves oscilations | |
| CN112804615B (en) | Method for reducing resonant frequency of bending beam transducer and structure thereof | |
| JP2012114496A (en) | Piezoelectric vibrating reed and piezoelectric vibrator | |
| CN209994353U (en) | High-frequency polishing quartz wafer with short H-shaped structure | |
| CN207223488U (en) | Magnetic suction disc and destressing magnetic suction disc | |
| CN109857065A (en) | Large mold depth chamber opens thick method and application | |
| CN210518236U (en) | High-frequency polishing quartz wafer with long H-shaped structure | |
| CN113556099B (en) | Piezoelectric quartz crystal oscillation piece, resonator and oscillator | |
| Karttunen et al. | Reduction of stimulated brillouin scattering by the generation of ion acoustic harmonics | |
| JPH09265966A (en) | Rectangular battery outer packaging can | |
| Shiotani et al. | Angular correlation of positron annihilation radiation in magnesium | |
| JPH07120920B2 (en) | Rectangular crystal unit for overtone | |
| CN110224683B (en) | High-frequency polished quartz wafer with long H-shaped structure | |
| JP2020076151A (en) | Microroughened electrolytic copper foil and copper-clad substrate with the same | |
| WO2013151048A1 (en) | Crystal oscillation device | |
| CN110224681B (en) | High-frequency polished quartz wafer with short H-shaped structure | |
| CN206622624U (en) | A kind of lathe spindle box structure | |
| CN209792820U (en) | Stainless steel spare aperture processing frock | |
| JP7430603B2 (en) | Manufacturing method for three-dimensional objects | |
| JP2002057019A (en) | Unidirectionally grain-oriented magnetic steel sheet for low-noise transformer | |
| JP2014143587A (en) | Crystal oscillator and production method of the same | |
| JP2001162331A (en) | Manufacturing method of laed frame |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |