منابع مشابه
Micro Piezoelectric Ultrasonic Motors
This paper reviews recent developments of micro ultrasonic rotary motors using piezoelectric resonant vibrations. Following the historical background, four ultrasonic motors recently developed at Penn State University are introduced; windmill, PZT tube, metal tube, and shear-type motors. Driving principles and motor characteristics are described in comparison with the conventional ultrasonic mo...
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A growing demand for actuators with a volume of less than 1 mm3 has driven researchers to produce a varied range of micro/milli-scale designs. By examining the underlying physics of the actuator operation we are able to demonstrate why piezoelectric ultrasonic actuators have the greatest potential to meet this need. Moreover, it allows us to create a new classification system for piezoelectric ...
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This paper describes the work done in an attempt to integrate ultrasonic sensors in micro-fluidic channels. We have developed a system with fluidic channels having embedded zinc oxide transducers. A zinc oxide film is deposited on a glass substrate and is sandwiched between two electrodes. The transducers made are found to resonate at 400 MHz in thickness mode. The channels are made both from P...
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Micro-forming is a miniaturization technology with great potential for high productivity. Some technical challenges, however, need to be addressed before micro-forming becomes a commercially viable manufacturing process. These challenges include severe tribological conditions, difficulty in achieving desired tolerances, and short tool-life due to inability of available die materials to withstan...
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The cornea, the window of the eye, provides approximately two-thirds of the total refractive power. The unique set of corneal biomechanical properties determined by its complex structure plays an important role in maintaining corneal function and human vision system [1]. Many factors, like ageing, trauma, diseases or clinical refractive surgery would affect the corneal biomechanics and finally ...
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ژورنال
عنوان ژورنال: Journal of the Japan Society for Precision Engineering
سال: 1989
ISSN: 1882-675X,0912-0289
DOI: 10.2493/jjspe.55.1350