The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 17, 2002
Filed:
Jan. 10, 2002
John Whiteside, Lenexa, KS (US);
Craig Mehan, Overland Park, KS (US);
Garmin Corporation, Shijr, TW;
Abstract
An ultrasonic sonar transducer ( ) for facilitating transmission and reception of sonar signals, particularly at high speeds. The sonar transducer includes a transducer element ( ) and a transducer housing ( ). The housing includes a bottom wall ( ) that is continuously curved with no major portion thereof parallel to the bottom face of the element. The bottom wall has a recessed portion ( ) that partially forms an acoustic window for facilitating the transmission and reception of acoustic energy, with the acoustic window having a thickness approximately equal to one half or an integer multiple of one half of the wavelength of the acoustic energy. The bottom is preferably bow-shaped to create a positive angle of attack relative to the oncoming water, thereby promoting a laminar flow that reduces turbulence and cavitation and therefore nearly eliminates undesirable attenuation and reflection of transmitted and received energy.