Patent
Elastic surface wave transducer
Kentaro Hanma,Hazama Takeshi +1 more
TLDR
In this article, the authors propose to suppress triple transit echo by zeroing the reflection based on the discontinity of auido impedance, through the arrangement of fingers of an inter digital transducer with a given distance.Abstract:
PURPOSE:To suppress triple transit echo, by zeroing the reflection based on the discontinity of auido impedance, through the arrangement of fingers of an inter digital transducer with a given distance.read more
Citations
More filters
PatentDOI
Ultrasonic diagnostic apparatus
TL;DR: In this article, the demodulator can be divided into two or more stages, and therefore with a circuit scale corresponding to the sum of the operation circuit numbers of two or multiple demodulators, the time side lobe reduction effect can be obtained at a level equivalent to that obtainable with the product of the operator circuit numbers.
PatentDOI
Surface Acoustic Wave Device
TL;DR: In this paper, a surface acoustic wave device consisting of a piezoelectric substrate and first and second comb-shaped electrodes each having a bus-bar portion parallel to a propagation direction of a surface acoustic wave in the substrate is described.
Patent
Surface acoustic wave filter
Yuji Fujita,Hamazaki Junichi,Murakami Satoru,Osawa Shinichiro,Takashi Shiba,眞一郎 大澤,哲 村上,淳一 浜崎,芝 隆司,勇次 藤田 +9 more
TL;DR: In this article, the authors proposed a cascaded multiplex mode surface acoustic wave filter with small insertion loss in a passband and with a wide passband, where three interdigital electrodes (IDTs) are closely provided along the propagation direction of exciting surface acoustic waves on a piezoelectric substrate, and reflectors are provided on both sides of the series of IDTs, thereby providing 3IDT cascaded duplex mode filters utilizing at least a primary or third-order oscillation mode generated by acoustic coupling among the three IDTs.
Patent
Patterned transducer apparatus for correcting spurious signals in said devices
TL;DR: In this paper, a theft resistant security system for motor vehicles is described, where a SAW (surface acoustical wave) device associated with the receptacle for relative movement is also provided.
Patent
Method and apparatus for grinding end face of steel material
Someya Masaaki,Higuchi Mitsuo +1 more
TL;DR: In this paper, a grinder frame and a touching roll arm are swingably supported about the same shaft on a strut erected on a frame 3 to improve productivity and provide an uniformly finished surface in grinding an end face of steel material by first removing the head of large burr with constant amount grinding and then residual Burr with changedover pressure grinding while bevelling.