Patent
1981-04-30
1983-06-14
Henry, Jon W.
350295, G02B 718
Patent
active
043879730
ABSTRACT:
A self-cleaning optical device, suitable for use in dirty process environments has a composite, multi-layered structure. A protective outer layer, exposed to the process environment, is a transparent plastic film which is resistant to the adhesion of contaminants to its surface. A light-interactive layer, either light-transmissive or light-reflective depending on the intended function of the optical device, is disposed beneath the protective plastic film layer. A semi-rigid plastic material forms a support layer to give the device structural integrity. The optical device is vibrated to shake loose collected particles from the protective plastic film. The vibrational motion is generated either externally or by excitation of piezoelectric materials incorporated into the device construction.
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Sato et al,, Takuso, Applied Optics, vol. 19, No. 9, May 1, 1980, pp. 1430-1434.
Henry Jon W.
Paglierani Ronald J.
The Foxboro Company
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