Automatically controlled cleaning device, notably for a motor ve

Details Automatically controlled cleaning device, notably for a motor ve Automatically controlled cleaning device, notably for a motor ve

1992-05-08

1993-11-30

Ro, Bentsu

Electricity: motive power systems

Automatic and/or with time-delay means

Moisture content or wetness

318460, 318DIG2, B60S 108, G01N 2900

Patent

active

052668738

ABSTRACT:
An automatically controlled cleaning device is adapted to remove foreign bodies such as water from the surface of a window, such as a car window, which has an inside surface and an outside surface. This device has cleaning element which define at least one predetermined area on the outside surface of this window, driving circuit for the cleaning element which operate in response to a control signal, detection element capable of supplying a detection signal representative of the presence of foreign bodies on the outside surface of the window and control device capable of supplying a control signal in response to the detection signal wherein the detection element comprise a transducer able to emit at least one incident ultrasonic signal propagating within the thickness of the window and able to receive a reflected ultrasonic signal representative of the presence of the foreign bodies to analyse the detection signal and where the transducer is fixed by a first face against the inside surface of the window.

REFERENCES:
patent: 3794866 (1974-02-01), McElroy et al.
patent: 4180886 (1980-01-01), Scherz
patent: 4542325 (1985-09-01), Kobayashi et al.
patent: 4768256 (1988-09-01), Motoda
patent: 4827198 (1989-05-01), Mueller et al.
Article entitled "Acoustic Properties of Particle/Polymer Composites for Ultrasonic Transducer Backing Applications" Grewe, et al., Nov. 1990, pp. 506-513.
Article entitled "Multipurpose Backing Materials for Piezoelectric Broadband Transducers" Bar-Cohen, et al., May 1984, vol. 75, No. 5, pp. 1629-1633.

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