Optical: systems and elements – Lens – With variable magnification
Patent
1996-09-12
1998-09-15
Font, Frank G.
Optical: systems and elements
Lens
With variable magnification
359691, G02B 1514
Patent
active
058088113
ABSTRACT:
The invention relates to a zoom lens system which, albeit having a zoom ratio as high as about 3.4, is quite well corrected for aberrations from the wide-angle to telephoto end thereof, and comprises a very reduced number of lenses involved. The zoom lens system comprises a plurality of lens groups (G1 and G2) with spaces therebetween, wherein at least one of said spaces is varied for zooming. The lens group G2 having negative refracting power is located nearest to the image surface side of the system, and includes at least one lens having positive refracting power, which is made of a gradient index lens having a refractive index varying in a direction perpendicular to the optical axis of the system. This gradient index lens has an aspheric surface on at least one side, and at least one lens having negative refracting power is located on the image surface side with respect to that gradient index lens.
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Font Frank G.
Olympus Optical Co,. Ltd.
Stafira Michael P.
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