1974-03-15
1976-02-03
Smith, Alfred E.
350288, G02B 508
Patent
active
039361594
ABSTRACT:
A plastic film mirror is formed by attaching a highly reflective, metallized polyester film to a frame having a rigid base section and a resilient upper section capable of bending inwardly towards the interior of the mirror, and subjecting said film to an elevated temperature for a specific period of time to cause the film to shrink in at least one direction. The shrinking of the film urges the resilient upper section of the frame inwardly thereby causing said film to be maintained in a state of constant tension by the restoring tendency of the resilient upper section. The plastic film mirror may be further provided with a means for modifying the reflective characteristics of a portion of the mirror. The means preferably comprises a shallow dish located behind the mirror which when evacuated draws the reflective film inward and thereby causes a concave indentation. Conversely, a pressure greater than ambient atmospheric pressure may be applied to the shallow dish and a portion of the film will be caused to become convex.
REFERENCES:
patent: 1632236 (1927-06-01), Kirk-Schneider
patent: 1849708 (1932-03-01), Colbert et al.
patent: 2952189 (1960-09-01), Pajes
patent: 3552835 (1971-01-01), Benzies
patent: 3733116 (1973-05-01), Hutchinson
Henry Jon W.
New Age Mirror & Tile Industries
Smith Alfred E.
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