JPS5576323A - Electronic spectacles - Google Patents

Abstract

PURPOSE: To eliminate defects such as aberrations and swings of images during wearing, conspicuousness of boundary lines of lenses and others by subjecting a portion of the spectacle lenses electrically to refractive index controlling.

CONSTITUTION: A small ball which is capable of controlling refractive indices is inserted in the near-vision part and intermediate-vision part of a spectacle lens. Namely, the small ball is inserted at the faying surface 3 of lenses 1, 2. The shape of the small ball for near-vision may be circle, segment, ellipse, etc. and its surface curve is preferably ellipsoid of revolution and surface of revolution of n-degrees, in order to reduce the aberrations of the lens. Transparent electrodes are coated on the lens 1 and 2 in contact with the small ball 4. These are mutually insulated and lead wires 5, 6 are led out from the respective transparent electrodes. The lead wires are connected to a power source which applies voltage and current to the small ball part and changes its refractive index. Liquid crystal is put in a cavity part 4. In this way, the refractive index may be changed continuously or stepwise.

COPYRIGHT: (C)1980,JPO&Japio