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:
Nov. 16, 1976
Filed:
Dec. 04, 1972
Joseph E Martin, Los Angeles, CA (US);
Gene Zilinskas, Van Nuys, CA (US);
The Bendix Corporation, North Hollywood, CA (US);
Abstract
An underwater transducer having both projector and hydrophone elements utilizes a new technique permitting the annular projector rings of a given piezoelectric material and resonant frequency to be tailored in diameter to accommodate various requirements, such as a need for more interior space. Where the projector rings can be expanded to the diameter of an accompanying hydrophone array, this makes possible a more compact and, in particular, a shorter structure than has been used for transducers of similar capability before. In the transducer the projector rings are positioned axially along a central support tube alternating with the hydrophones arranged in annular groups. Each projector ring is formed of a plurality of segments of alternately active material and inactive material having a sound velocity differing from (usually faster than) that of the active material. Thus the diameter of the annular elements for a given active material and a desired resonant frequency may be varied since the resonant frequency is related to the velocity of sound in the composite material used in the elements.