Zoom lens

Details Zoom lens Zoom lens

1994-11-10

1997-04-01

Epps, Georgia Y.

Optical: systems and elements

Lens

With variable magnification

359690, 359687, 359688, G02B 1514

Patent

active

056172532

ABSTRACT:
A zoom lens system using inexpensive plastic lens materials and having a good aberration performance and good optical performance includes a first lens group having a positive refractive power and a second lens group having a negative refractive power, a distance between the first lens group and the second lens group being variable during zooming, wherein 37<(F.sub.I .multidot.f.sub.bT /D.sub.T .multidot.f.sub.bW)<48; and 2.5<D.sub.T /N.sub.nI <3.5 where f.sub.I is focal length of the first lens group, f.sub.bT is back focus distance at a telephoto position, f.sub.bW is back focus distance at a wide angle position, D.sub.T is distance between the first lens group and the second lens group at a telephoto position, and N.sub.nI is refractive ratio of the lens having a negative refractive power in the first lens group.

REFERENCES:
patent: 4838669 (1989-06-01), Ogata et al.
patent: 5109299 (1992-04-01), Kato
patent: 5398135 (1995-03-01), Ohashi

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