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:
Apr. 20, 1993
Filed:
Oct. 26, 1990
Applicant:
Inventor:
Masanori Sugiyama, Nishio, JP;
Assignee:
Aisin Seiki K.K., Kariya, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01N / ; G08B / ;
U.S. Cl.
CPC ...
7317017 ; 340602 ;
Abstract
A raindrop sensor attached to a plate such as a windshield of a car. A first piezoelectric element as an ultrasonic generator is fitted to the plate via a first coupler. The coupler fixes the first element in an inclined state by a predetermined angle relative to the plate. Thereby, elastic waves or ultrasonic waves from the first element are transmitted while being repeatedly reflected in the plate. A second piezoelectric element as an electro-acoustic transducer is fitted to the plate via a second coupler. The second element detects amplitude of the ultrasonic waves transmitted in the plate.