Bifocal lens and bifocal glasses

摘要

Disclosed is a bifocal lens constructed such that the lens is not easily damaged when hit by flying fragments and, moreover, able to obtain a consistent focal length with a simple construction. The lens is equipped with a transparent substrate having transparency and rigidity, a transparent resilient body having transparency and elasticity, a transparent fluid enclosed in the space between the aforementioned transparent substrate and the aforementioned transparent resilient body, and a mechanism that induces changes in the shape of the aforementioned transparent resilient body. Changes are induced in the shape of the transparent resilient body to form the desired shape in the two states of the lens which comprises the transparent fluid enclosed in the space between the transparent substrate and the transparent resilient body, making it possible to obtain the desired characteristics (accurate optical characteristics) in either of the two states.

主权项

1. A bifocal lens comprising:
a transparent substrate having transparency and rigidity; a transparent rigid-elastic body having transparency and elasticity, and whose periphery is sealed to the transparent substrate; a transparent fluid confined only to an area between the transparent substrate and the transparent rigid-elastic body; and a drive mechanism driven by an electrical circuit inducing a discrete change in shape of the transparent rigid-elastic body, wherein the transparent rigid-elastic body has a portion having two stable shapes which are convex and concave, and wherein the drive mechanism is for changing shape of the portion from the convex shape to the concave shape or vice versa.