Rain drop detecting device

Details Rain drop detecting device Rain drop detecting device

1998-02-12

2000-01-18

Williams, Hezron

Specialized metallurgical processes, compositions for use therei

Processes

Producing or treating free metal

7317017, 318483, 318DIG2, 340602, G01N 2920, B06B 302

Patent

active

060154497

ABSTRACT:
A rain drop detecting device includes an oscillation element disposed on a plate member such as a windshield for generating an ultrasonic wave on the plate member, an ultrasonic wave receiving element disposed on the plate member for receiving the ultrasonic wave generated by the oscillation element, a detecting device connected to the ultrasonic wave receiving element for detecting an amplitude of the ultrasonic wave, and an ultrasonic wave absorbing member disposed on the plate member. The absorbing member is designed to absorb a portion of the ultrasonic wave generated by the oscillation element to prevent the downwardly travelling portion of the ultrasonic wave from travelling beyond a desired region of the plate member. In the case of a windshield, the absorbing member can be used to prevent the ultrasonic wave from travelling to the resting location of the wiper so that inadvertent rain drop detection does not occur.

REFERENCES:
patent: 4584508 (1986-04-01), Kobayashi et al.
patent: 4604612 (1986-08-01), Watkins et al.
patent: 5187980 (1993-02-01), Blair et al.
patent: 5203207 (1993-04-01), Sugiyama
patent: 5432415 (1995-07-01), Ittah et al.
patent: 5539289 (1996-07-01), Wiget

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