Optical lens for differential correction

• US 4,174,156 A
• Filed: 10/31/1977
• Issued: 11/13/1979
• Est. Priority Date: 11/02/1976
• Status: Expired due to Term

• Current Assignee: Gilbert Glorieux
• Original Assignee: Gilbert Glorieux
• Inventors: Glorieux, Gilbert
• Primary Examiner(s): Corbin, John K.
• Assistant Examiner(s): Sugarman, Scott J.
• Application Number:
  US05/847,102
• Time in Patent Office: 743 Days
• Field of Search: 350/179, 350/180, 351/161, 351/168, 351/169
• US Class Current: 351/168
• CPC Class Codes: G02B 3/14 of variable focal length
• CPC Class Codes: G02C 7/041 bifocal; multifocal
• CPC Class Codes: G02C 7/06 bifocal; multifocal ; progressive G02C7/041 takes precedence
• CPC Class Codes: G02C 7/085 Fluid-filled lenses, e.g. electro-wetting lenses

Abstract

An optical lens for differential correction comprising two transparent walls defining an enclosed space having therein a quantity of a transparent liquid with a predetermined optical index; the walls are so formed as to provide at the optical center a capillary space into which the liquid is aspirated when the lens is tilted at a predetermined angle for changing the power of the lens.

Claims

1. A convergent optical correction lens comprising a pair of transparent walls defining a closed internal space therebetween, at least one transparent liquid of predetermined index of refraction in a portion of said internal space, said walls being configured so as to establish in said internal space a zone having a reduced thickness, said zone surrounding the optical axis of said lens and having a capillary volume, said liquid being present in the lower part of said internal space when the optical axis is substantially horizontal, and said liquid filling said capillary volume by capillary action when said lens is tilted in relation to the vertical by at least a predetermined angle.

2. A convergent optical lens as in claim 1, wherein said capillary volume is formed by an interior extra thickness provided on at least one of said walls and extending over said zone.

3. A convergent optical lens as in claim 1, wherein said two walls have a form adapted to the exterior of said zone for defining an internal space with a greater peripheral thickness in order to reduce the effect of the capillary forces at the area of greater peripheral thickness and to form a liquid reservoir at the bottom of the internal space.

4. A convergent optical lens as in claim 1, wherein the form of said walls and the quantity of liquid are adjusted such that said predetermined angle is on the order of approximately 30°

to 40°

.

5. A convergent optical lens as in claim 1, intended for an eye which necessitates an optical power P₁ for distance vision and a greater optical power P₂ for near vision, wherein the curvature of the walls in said zone and the index of refraction of the liquid being such that the lens has a power P₁ in said zone without liquid in the capillary volume and a power P₂ in the presence of said liquid in said capillary volume.