Method and apparatus for adjusting the focal length of a optical

Details Method and apparatus for adjusting the focal length of a optical Method and apparatus for adjusting the focal length of a optical

1989-10-19

1992-02-25

Arnold, Bruce Y.

Optical: systems and elements

Lens

Fluid

G02B 106, G02B 314

Patent

active

050918010

ABSTRACT:
A nearly index matched (NIM) optic is formed from at least two elements having indices of refraction that are substantially the same over a given range of wavelengths. The optical cell can have matched solid and fluid lenses in which the solid has at least one curved interface in contact with the fluid. The solid and fluid share a boundary with equal but opposite curvature at each point over the aperture of the NIM optic. The effective optical curvature of the boundary is reduced by the difference in the index of refraction between the two elements of the NIM optic. This difference in the index of refraction can be controlled by changing the index of refraction of at least one of the elements so as to change the difference in the index of refraction across the optical boundary.

REFERENCES:
patent: 4331388 (1982-05-01), McCrobie et al.
patent: 4497544 (1985-02-01), Mitchell et al.
patent: 4582398 (1986-04-01), Roberts et al.
patent: 4732458 (1988-03-01), Zambelli
patent: 4758072 (1988-07-01), Harrigan
patent: 4872743 (1989-10-01), Baba et al.

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