Zoom lens

Details Zoom lens Zoom lens

1993-07-01

1995-06-13

Sugarman, Scott J.

Optical: systems and elements

Lens

With variable magnification

359713, G02B 1514

Patent

active

054248698

ABSTRACT:
An inner focus type zoom lens is a nine lens system including third, fourth and seventh lenses which are plastic lenses including aspherical surfaces, and first, second, fifth, sixth, eighth and ninth lenses which are spherical glass lenses. This zoom lens system can reduce the manufacturing cost by employing the plastic lenses and eliminating aspherical glass surfaces. Moreover, this zoom lens system is superior in correction of aberrations and less susceptible to temperature changes.

REFERENCES:
patent: 5100223 (1992-03-01), Ono et al.
patent: 5221994 (1993-06-01), Nishio
patent: 5321552 (1994-06-01), Horiuchi et al.
patent: 5353157 (1994-10-01), Horiuchi

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