Window, notably automobile vehicle windscreen, including an inte

Details Window, notably automobile vehicle windscreen, including an inte Window, notably automobile vehicle windscreen, including an inte

1994-08-08

1995-07-25

Ryan, Patrick J.

Stock material or miscellaneous articles

Structurally defined web or sheet

Discontinuous or differential coating, impregnation or bond

428 344, 428 34, 428 45, 367188, 310322, B32B 900

Patent

active

054360609

ABSTRACT:
The invention concerns a window including at least a first sheet (16), a second sheet (18), said sheets being joined together by a connecting layer (20), characterised in that it also includes an ultrasonic device (12) placed between said sheets (16,18) and co-operating directly with a first face (24) of said first sheet (16) to detect the presence of foreign bodies on a second face (26) of said first sheet (16) opposite said first face (24), said device (12) comprising a transducer (28) able to emit, via a transmitting/receiving face, an incidental ultrasonic signal of wavelength .lambda. in said first sheet (16), the thickness of said first sheet being equal to K..lambda./2, where K is an integral number, and said transducer being able to receive, via said transmitting/receiving face a reflected ultrasonic signal representative of the presence or absence of said foreign bodies to generate a detection signal.

REFERENCES:
patent: 4827198 (1989-05-01), Mueller et al.
patent: 4867561 (1989-09-01), Fujii
patent: 4935723 (1990-06-01), Vallance
patent: 5266873 (1993-11-01), Arditi et al.

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