Field-customizable variable focal length lens
First Claim
Patent Images
1. A liquid-filled variable focus lens unit which comprises:
- a liquid-filled variable focus capsule having a first set of predetermined optical characteristics and comprised of;
i) a transparent wall member;
ii) a transparent distensible membrane; and
iii) a layer of transparent liquid filling the volume between said wall member and said distensible membrane; and
a fixed-focus rigid lens exterior of and attached to said liquid-filled variable focus capsule and abutting said wall member, whereby said liquid-filled variable focus lens unit comprised of said liquid-filled variable focus capsule and said fixed-focus rigid lens possesses a second set of predetermined optical characteristics.
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Accused Products
Abstract
A liquid-filled variable focus lens unit, particularly useful in eyeglasses, comprised of a generic variable focus capsule to which a fixed-focus rigid lens is attached. The capsule has a preestablished optical power at its distance setting, which may be the same for all capsules of a given style, and a variable optical addition. The rigid lens, which is attached to a completed capsule, includes a surface having a shape related to the visual acuity of an intended user so that the combination of a generic capsule and the rigid lens results in a lens unit having a net optical power which matches the refractive prescription of the intended user at all distances.
221 Citations
14 Claims
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1. A liquid-filled variable focus lens unit which comprises:
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a liquid-filled variable focus capsule having a first set of predetermined optical characteristics and comprised of; i) a transparent wall member; ii) a transparent distensible membrane; and iii) a layer of transparent liquid filling the volume between said wall member and said distensible membrane; and a fixed-focus rigid lens exterior of and attached to said liquid-filled variable focus capsule and abutting said wall member, whereby said liquid-filled variable focus lens unit comprised of said liquid-filled variable focus capsule and said fixed-focus rigid lens possesses a second set of predetermined optical characteristics. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A liquid-filled variable focus lens unit which comprises:
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a closed chamber having opposed exterior walls, said opposed exterior walls of said chamber comprising a transparent wall member and a distensible membrane; a transparent liquid filling said chamber; means for varying the pressure of said transparent liquid in said chamber; and a fixed-focus rigid lens exterior of said chamber and abutting said transparent wall member. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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Specification