Cleaning apparatus for a mirror

Details Cleaning apparatus for a mirror Cleaning apparatus for a mirror

1989-02-27

1991-08-06

Arnold, Bruce Y.

Optical: systems and elements

Protection from moisture or foreign particle

G02B 510

Patent

active

050371894

ABSTRACT:
Ultrasonic vibrators, attached to the back of a mirror, are vibrated according to an A.C. signal pattern which is selected from various A.C. signal patterns for the removal of water, frost and/or ice from the surface of the mirror. Further included is a temperature detecting device attached to the back of the mirror for inhibiting operation of the ultrasonic vibrators when the temperature of the mirror exceeds a predetermined temperature, to thus avoid thermally-induced damage to the mirror.

REFERENCES:
patent: 3453049 (1969-07-01), Wager, Jr.
patent: 4277672 (1981-07-01), Jones
patent: 4445063 (1984-04-01), Smith
patent: 4550988 (1985-11-01), Harder et al.
patent: 4833373 (1989-05-01), Doi et al.
patent: 4864100 (1989-09-01), Cicak
patent: 4929072 (1990-05-01), Fujie et al.

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