Lens system with switchable soft focus

Details Lens system with switchable soft focus Lens system with switchable soft focus

1996-08-12

1998-08-18

Font, Frank G.

Optical: systems and elements

Lens

Multiple component lenses

359694, 359683, 359692, G02B 918

Patent

active

057965307

ABSTRACT:
A lens system is disclosed that can be used in either a normal sharp-focus configuration or in any of several soft-focus configurations for obtaining, for example, sharply focused or soft-focus photographic images of an object. The lens system has simple construction and axially comprises, in the normal sharp-focus configuration and from the object side, a first lens group having positive refractive power, an aperture stop, and a rear lens group having negative refractive power. To obtain a sharp-focus image, light passes through both lens groups and the aperture stop. For obtaining a soft-focus image, the second lens group is retracted (i.e., displaced from the optical axis such that light from the object does not pass through the second lens group), and light passes only through the first lens group and the aperture stop.

REFERENCES:
patent: 4273424 (1981-06-01), Nanjoh
patent: 4310221 (1982-01-01), Momiyama et al.
patent: 4825235 (1989-04-01), Wakabayashi et al.
patent: 4826301 (1989-05-01), Ikemori
patent: 4948236 (1990-08-01), Hirano

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