Multi-facet lens component

Details Multi-facet lens component Multi-facet lens component

1994-11-15

1996-05-07

Epps, Georgia Y.

Optical: systems and elements

Lens

Plural focal length

359672, G02B 310, G02B 1502

Patent

active

055152066

ABSTRACT:
A multi-facet lens member for use in an optical device such as a conventional camera or a video camera, comprising: (a) a multi-facet optical lens having at least four optical surfaces arranged in at least two pairs, each pair of the optical surfaces being adapted to provide a predetermined effective focal length in a light path; and (b) a rotational member for rotating the multi-facet optical lens so as to position a desired pair of the optical surfaces in the light path and provide a desired effective focal length for the optical device. The multi-facet optical lens member can be used alone or in conjunction with other conventional optical lens to obtain optimum effect. In an example embodiment of a fouri-facet lens member, one arrangement of the optical surfaces provides an effective focal length of 25 mm, thus representing a wide-angle lens. By a simple 90 degrees rotation of the lens member, an effective length of 90 mm can be obtained, thus representing a telephoto lens, from the same optical device.

REFERENCES:
patent: 4256936 (1981-03-01), Kawaguchi
patent: 4273410 (1981-06-01), Menke
patent: 4840466 (1989-06-01), Vamada
patent: 4932732 (1990-06-01), Nakajima
patent: 5027144 (1991-06-01), Ohno

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