Switchable lens
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United States of America Patent
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Jan 27, 1998
Grant Date -
N/A
app pub date -
Oct 3, 1995
filing date -
Apr 7, 1993
priority date (Note) -
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Abstract
A lens assembly (1) comprises a lens (2;10,11;20) the focal length of which may be changed by application of an electric or magnetic field. A switching means (4,15) provides a drive impulse to change the focal length of the lens (2;10,11;20). An integral power source (4,15) provides power for the switching means. A lens which can be switched between near and distance vision by the user is thereby provided.
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