VARIABLE FOCUS LIQUID LENSES

• US 3,598,479 A
• Filed: 03/10/1969
• Issued: 08/10/1971
• Est. Priority Date: 03/11/1968
• Status: Expired due to Term

• Current Assignee: Wright Basil Martin
• Original Assignee: Wright Basil Martin
• Inventors: WRIGHT BASIL MARTIN
• Application Number:
  US04/805,717
• Time in Patent Office: 883 Days
• US Class Current: 351/159.04
• CPC Class Codes: G02B 3/14 of variable focal length
• CPC Class Codes: G02C 7/085 Fluid-filled lenses, e.g. electro-wetting lenses

Abstract

An ophthalmic lens has components respectively in the form of a meniscus and a thin resilient sheet, which are secured together so as to provide between them a cell filled with transparent liquid, the volume of liquid in the cell being variable to change the curvature of the sheet and thereby provide a continuous variation in the focus of the lens.

Claims

1. A variable focus lens suitable for ophthalmic purposes comprising a first component in the form of a rigid simple lens having at least one concave face, a second component comprising a resilient sheet of glass, an interlayer made from polyvinyl butyral sandwiched between and adherent to the concave face of said first component and to said second component, said interlayer being formed with a circular substantially aperture to provide between said concave face and one face of said second component a substantially centrally disposed cell, a duct formed in said first component and communicating with said cell, a transparent liquid having substantially the same refractive index as said first and second components filling said cell, said transparent liquid being a saturated aqueous solution of calcium bromide with glycerol, and a piston-cylinder assembly communicating with said duct for varying the volume of transparent liquid contained in said cell so as to vary the curvature of the second component in such a manner that the focusing power of said lens may be varied more than one diopter.