Patent ID: 7213460
Filing Date: 2007-05-08
Classification: G01H,G01S

Abstract:
1. An ultrasonic sensor, comprising: conversion devices for at least one of: wherein sizes of the conversion devices are uneven and primary resonance frequencies of the conversion devices are uneven, wherein each conversion device of the conversion devices has a shape of a flat rectangular plate having a certain surface which functions as at least one of a reception surface for receiving the first ultrasonic signal and a transmission surface for transmitting the second ultrasonic signal; wherein the conversion devices are arranged one-dimensionally on a plane so that: wherein widths of the conversion devices are even and thickness of the conversion devices are even; wherein longitudes of the conversion devices are uneven; wherein both longitudinal ends of every conversion devices are fixed to prevent the longitudinal ends from vibrating; wherein resonance values Q of the conversion devices are the same; wherein a first primary resonance frequency f wherein the coefficient n is either of 7 and 8.