Topic
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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29 Jul 1977TL;DR: In this article, a shutter control device is described, which includes a shutter which is openable to permit scene light to pass through a camera aperture, an electronic circuit for controlling the shutter to automatically establish exposure duration in accordance with the level of scene illumination, and piezoelectric means such as a bimorph for providing electrical power to the circuit when stressed, and means for repeatedly stressing the piezo-electric means during each exposure cycle.
Abstract: A shutter control device is disclosed which includes a shutter which is openable to permit scene light to pass through a camera aperture, an electronic circuit for controlling the shutter to automatically establish exposure duration in accordance with the level of scene illumination, piezoelectric means such as a bimorph for providing electrical power to the circuit when stressed, and means for repeatedly stressing the piezoelectric means during each exposure cycle.
14 citations
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21 Jul 2013TL;DR: In this article, a PZT bimorph technology for integrated chip-scale in-plane nano-motion actuators is demonstrated, where the actuators are micro-machined to define beams by laser-cutting through a pZT-4 plate while also defining arbitrary 2D electrode patterns on top and bottom surface of the beams by using a commercial laser cutting tool.
Abstract: We demonstrate a PZT bimorph technology for integrated chip-scale in-plane nano-motion actuators. Bulk PZT actuators are micro-machined to define beams by laser-cutting through a PZT-4 plate while also defining arbitrary 2D electrode patterns on top and bottom surface of the beams by using a commercial laser cutting tool with backside alignment capability. Lateral actuators that are 5, 10 and 20 mm long, 0.45 mm wide, and 0.5 mm thick were characterized with single and dual side laser patterned electrodes. The in-plane bimorph displacements are in the range of 0.02 to 0.64 microns/volt. The out of plane displacement sensitivity of these actuators were simulated to be ~ 100's ppm/V compared to the desired in plane actuation. We also report doubling of the actuator tip displacement for the same applied voltages in the dual side electrode actuators, when compared to the single sided actuators.
14 citations
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TL;DR: In this paper, the constitutive equations for an induced-strain bimorph were derived for a transducer with a substrate that has a variable thickness and variable modulus.
Abstract: The constitutive equations for an induced-strain bimorph are derived for a transducer with a substrate that has a variable thickness and variable modulus. The constitutive equations for sensing and...
14 citations
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TL;DR: In this article, a solution is given to the problem of determining the optimal parameters of a bimorph drive in optical measuring systems with feedback, and experimental data are presented to evaluate the performance of the drive.
Abstract: The problem is considered of improving a bimorph drive used in optical measuring systems with feedback. In particular, a solution is given to the problem of determining the optimal parameters of a bimorph drive in a system. Experimental data are presented. Advantages and deficiencies of the drive are considered.
14 citations
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28 May 1997TL;DR: In this paper, a system of two-dimensional first-order equations for electroded piezoelectric crystal plates with general symmetry and thickness-graded material properties was recently deduced from the three-dimensional equations of linear piezolectricity.
Abstract: A system of two-dimensional first-order equations for electroded piezoelectric crystal plates with general symmetry and thickness-graded material properties was recently deduced from the three-dimensional equations of linear piezoelectricity. These equations are much simplified for the two limiting cases of thickness-graded piezoelectric properties, i.e., the homogeneous plate and bimorph of piezoelectric ceramics. Closed form solutions are obtained from these reduced equations for the flexural and thickness-shear vibrations and static response of bimorph disks as well as for the extensional and thickness-stretch vibrations of homogeneous disks. Frequency spectra and modes are computed and examined. Resonance frequencies for both homogeneous and bimorph disks of PZT-857 are computed and measured. The comparison of the results shows that the agreement is close.
14 citations