To provide a liquid lens that has a low modulus of volume change due to liquid swelling of a deformation film, has no liquid exudation, is chemically stable, and is capable of securing a large variable-focus range.
The lens has a pair of transparent members 2 and 3, at least one of which is formed of a deformation film which is capable of deformation, and a transparent liquid 4, which fills a sealed space 5 sandwiched between the pair of transparent members 2 and 3, with the deformation film 3 and the liquid 4 which is configured with the following combination of materials. (1) A fluorine-based elastomer film and silicone oil which does not have affinity for the fluorine-based elastomer film. (2) Preferably, a fluorine-based elastomer film and a silicone oil with a molecular weight of 500 or higher and a viscosity of 50 (25C mm2/s) or greater. (3) Preferably, a fluorine-based elastomer film and a methylphenyl-based silicone oil or a dimethyl-based silicone oil with a molecular weight of 500 or higher and a viscosity of 50 (25C mm2/s) or greater. (4) A polyurethane-based elastomer film and a dimethyl-based silicone oil.
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