| 摘要 |
PROBLEM TO BE SOLVED: To provide a liquid lens that improves transmittance and light collection efficiency. SOLUTION: In the liquid lens 101, when a switch 132 is turned on, a voltage from the power supply 131 is applied between an upper electrode 120 and a lower electrode 115. This voltage application changes the wettability of a polar liquid 119 to an insulating film 117 in a cavity 102, so that the curvature of an interface between a non-polar liquid 118 and the polar liquid 119 is changed; then, the focal length of the liquid lens 101 is varied. In this case, even when the shape of the upper side of the cavity 102 is polygonal, since a surface tension acts such that the curvature of the interface becomes approximately constant, the curvature of the interface is approximately the same at any position. This invention is applicable to the liquid lens. COPYRIGHT: (C)2007,JPO&INPIT
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