| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a lens configuration, the power of which changes from a plus through zero to a minus, utilizing a liquid crystal lens. Ž<P>SOLUTION: A lens group A includes a liquid crystal lens 100 and a concave lens 150 with a negative power. The liquid crystal lens 100 includes two parallel transparent plates, a transparent electrode laid along the plates and a liquid crystal layer 30 filling the space between the plates. Powder of dielectric is applied to the inside surface of the transparent electrode to have a concentric distribution of concentration so that it becomes thinner as it goes toward the outside. When a potential difference is constant, the positive power of the liquid crystal lens 100 cancels the negative power of the concave lens 150. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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