Variable focal length lens, and focal length adjusting device, and imaging apparatus that use the same
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United States of America Patent
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May 1, 2012
Grant Date -
Dec 10, 2009
app pub date -
Aug 23, 2006
filing date -
Aug 23, 2005
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A variable focal length lens, as well as a focal length adjusting device and an imaging device using the same. A variable focal length lens has a lens, a positive electrode, and a negative electrode. A second layer and a first layer constituting the lens are formed from polyvinyl chloride with which a plasticizer has been mixed. The hardness of these layers is adjusted by adjusting the mixing quantity, plasticizer type, etc. The second layer is formed so as so cover at least a light transmission region of the first layer. When a voltage is applied between the positive electrode and the negative electrode, the second layer and first layer are deformed to be pulled to the positive electrode, and thereby the curvature of the variable focal length lens is varied to vary the focal length.
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