Patent ID: 8641213
Filing Date: 2014-02-04
Classification: A45D,G02B

Abstract:
1. A mirror comprising a shallow dish-like base, a mirror sheet and a back sheet both capable of varying their curvature, a mirror holder received rotatively within the base for air-tightly retaining the mirror sheet and the back sheet parallel to each other in a spaced-apart relation at peripheral edges of the mirror and back sheets to define an air-tight space between the mirror and back sheets, means for connecting the back sheet at its center to the base, and means for moving upwardly the mirror holder relative to the base, the moving means comprising threadedly engaging means between the mirror holder and the base, the connecting means including a tension plate secured at its one end to the back sheet and mounted at its other end in the base for rotation, actuation of the threadedly engaging means permitting the mirror holder to be moved outwardly relative to the base, thereby deforming the back sheet from its center so as to reduce the pressure in the air-tight space so that the difference between the reduced pressure and the atmospheric pressure permits the mirror sheet to be depressed into a curved surface, thereby providing a concave mirror.