Varifocal lens

Details Varifocal lens Varifocal lens

1994-08-05

1996-11-12

Epps, Georgia Y.

Optical: systems and elements

Lens

Fluid

359676, G02B 106, G02B 312, G02B 1514

Patent

active

055745989

ABSTRACT:
A varifocal lens whose variable focal length can be controlled by, for example, an electric signal, and suitable for use in bar code readers, etc. A varifocal lens comprises a first pressure chamber defined between a glass substrate and a transparent elastic film. The transparent elastic film is faced to the surface of the planar glass substrate having parallel surfaces with a spacer incorporated therebetween to provide the first pressure chamber. A pump is provided adjacent to the first pressure chamber via a communicating path for charging an operating liquid to the first pressure chamber from a second pressure chamber of the pump by electrically deforming the transparent elastic film to form a lens having a variable focal length. The transparent elastic film has a film thickness distribution as such to provide a spherical plane in the central portion thereof and a third order curved surface in the periphery thereof. In this manner, a lens free of aberration can be obtained when a liquid is fed into the first pressure chamber to form a spherical plane.

REFERENCES:
patent: 3598479 (1971-08-01), Wright
patent: 4859041 (1989-08-01), Suda
patent: 5443506 (1995-08-01), Giarabet
Sato, et al: "Deformable 2-D mirror using multilayered electrostrictors"; Applied Optics, vol. 21, No. 20, Oct. 15, 1982--pp. 3669-3672.

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