Field-customizable variable focal length lens
OwnerSaul Epstein, Stephen Kurtininventors
Life of this patent
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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.
Claims14
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.
A liquid-filled variable focus lens unit which comprises:
- 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.
Dependencies are inferred from the claim text.