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Bimorph

About: Bimorph is a research topic. Over the lifetime, 3339 publications have been published within this topic receiving 51880 citations.


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Patent
22 Apr 1987
TL;DR: An apparatus for driving a magnetic head including a monolithic bimorph member is described in this paper, which consists of a piezoelectric ceramic sintered body formed from a plurality of electrodes stacked alternately with ceramic layers.
Abstract: An apparatus for driving a magnetic head including a monolithic bimorph member. A first end of the monolithic bimorph member has the magnetic head fixed thereto, and the other end thereof is fixed to a support member to be supported by the support member. The monolithic bimorph member comprises a piezoelectric ceramic sintered body formed from a plurality of electrodes stacked alternately with ceramic layers. The plurality of electrodes includes first and second electrode groups which are electrically connected with each other by conductors in through holes. The through holes are provided in portions of the sintered body close to the end fixed to the support member.

15 citations

Patent
01 Dec 2005
TL;DR: In this article, the authors proposed a method to secure the acoustic characteristics of a piezoelectric sounding body by setting the total sum of side surface areas of the sound releasing holes to a value from 1.5 mm to 60 mm.
Abstract: An enclosure of a cellular phone is formed with a plurality of sound releasing holes. The inside of a portion where the sound releasing holes are provided defines an air chamber formed with a receiving portion for mounting a piezoelectric sounding element. The piezoelectric sounding element is of bimorph structure formed by adhering piezoelectric elements on both surfaces of a diaphragm, and serves as a speaker by hermetically fixing a peripheral edge of the diaphragm to the receiving portion. Acoustic characteristics of such a piezoelectric sounding body relates to the total sum S of side surface areas of the sound releasing holes. Therefore, by setting the total sum to a value from 1.5 mm to 60 mm 2 , variations in resonant frequency and lowering of the sound pressure are prevented, and hence the required acoustic characteristics can be secured while realizing reduction of the thickness of the wall of the enclosure.

15 citations

Patent
23 Mar 2001
TL;DR: In this article, a thin-film bimorph structure was proposed to suppress the variation of the sensitivity or displacement of a piezoelectric element to a low level and downsize it.
Abstract: PROBLEM TO BE SOLVED: To suppress the variation of the sensitivity or of displacement of a piezoelectric element to a low level and downsize it. SOLUTION: This piezoelectric element comprises a lower electrode 102, a first and second piezoelectric films 104 of 3 μm thickness each, and an upper electrode 105 formed on a (100)MgO single-crystal film-formed substrate 101. The first and second piezoelectric films 103, 104 are formed continuously by sputtering at mutually different substrate temps., such that, e.g. their polarization directions are mutually reverse, as shown by arrow marks A, B on the drawing, thus forming a piezoelectric element having a thin-film bimorph structure.

15 citations

Journal ArticleDOI
TL;DR: In this article, an improved theoretical approach is presented that combines a comprehensive composite theory analysis of the bending with a detailed analytical approach for the gradual stress transfer from the edges of the piezoceramic induced by a deformational misfit between the layers.
Abstract: The stimulation of controlled deformation in lightweight constructions by means of actuator units as an integrated part of the structure currently represents an attractive subject in engineering. A common design uses a piezoelectric film that is bonded to a shell component by an adhesive layer and induces a bending deformation in the structure. A simplified beam design has been used as a test set-up to characterize the actuator performance of a given system under practical conditions. The bimorph configuration consists of an actuator unit, the bonding adhesive and the substrate material from which the lateral bending deflection of the free end, induced by actuation of the piezoelectric film, is measured. An improved theoretical approach is presented that combines a comprehensive composite theory analysis of the bending with a detailed analytical approach for the gradual stress transfer from the edges of the piezoceramic induced by a deformational misfit between the layers. The results are validated by a finite element analysis of the system. They reveal a substantial influence of the assumptions for the transverse (width direction) state of deformation for which free bending appears to be the most realistic for the test geometry. The study is completed by an experimental analysis that investigates the influence of adhesive stiffness and layer thickness on the actuator performance of a system consisting of a steel substrate and a carbon fibre reinforced substrate and a prototypic PZT actuator module. The results are correlated to the model providing a confirmation of the essential trends.

15 citations

Journal ArticleDOI
29 Sep 2016-Sensors
TL;DR: A Fourier transform spectrometer (FTS) that incorporates a closed-loop controlled, electrothermally actuated microelectromechanical systems (MEMS) micromirror is proposed and experimentally verified, achieving a significant improvement compared to the prior work.
Abstract: A Fourier transform spectrometer (FTS) that incorporates a closed-loop controlled, electrothermally actuated microelectromechanical systems (MEMS) micromirror is proposed and experimentally verified. The scan range and the tilting angle of the mirror plate are the two critical parameters for MEMS-based FTS. In this work, the MEMS mirror with a footprint of 4.3 mm × 3.1 mm is based on a modified lateral-shift-free (LSF) bimorph actuator design with large piston and reduced tilting. Combined with a position-sensitive device (PSD) for tilt angle sensing, the feedback controlled MEMS mirror generates a 430 µm stable linear piston scan with the mirror plate tilting angle less than ±0.002°. The usable piston scan range is increased to 78% of the MEMS mirror's full scan capability, and a spectral resolution of 0.55 nm at 531.9 nm wavelength, has been achieved. It is a significant improvement compared to the prior work.

15 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202358
2022116
202191
202090
2019123
2018117