| 摘要 |
PURPOSE:To make the focuses of right and left lenses coincident with each other so that the change rate of the focal length with respect to the same impressed voltage does not change with the right and left lenses by incorporating liquid crystal lenses into a frame in such a manner that the directors of the liquid crystal molecules are made symmetrical with the center line of the spectacle frame. CONSTITUTION:The directions nL, nR of the directors of the liquid crystal molecules in the right and left liquid crystal lenses 2, 3 are symmetrical with the center of the spectacles. More specifically, the liquid crystal lenses 2, 3 are incorporated into the spectacle frame 4 in such a manner that the directors of the liquid crystal molecules are made symmetrical with the center line of the frame 4 and therefore, the relation of the liquid crystal molecules 6, 7 in the liquid crystal lenses 2, 3 and the incident light is thetaL=thetaR on the right and left and the refractive indices of the right and left liquid crystal lenses 2, 3 are equal. The changes of the refractive index when the voltage from a driving power source 5 is successively impressed are also symmetrical with the center. Infeasibility of focusing is thus obviated.
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