High zoom-ratio lens system for covering wide angle for compact

Details High zoom-ratio lens system for covering wide angle for compact High zoom-ratio lens system for covering wide angle for compact

1990-04-27

1991-07-23

Arnold, Bruce Y.

350423, G02B 1514

Patent

active

050338323

ABSTRACT:
A high zoom-ratio lens system covering wide angle for compact camera comprising a first lens group having a positive focal length, a second lens group having a positive focal length, and a third lens group having a negative focal length, disposed in order from the object side. When zoomed from a short focal length side to a long focal length side, all of the first lens group, the second lens group, and the third lens group being moved toward the object so that a distance between the first lens group and the second lens group increases and the distance between the second lens group and the third lens group decreases. The second lens group further comprises, in the order from the object side, a lens group IIa having a negative focal length and a lens group IIb having a positive focal length. When zoomed from the short focal length side to the long focal length, a stop diaphragm is moved along with the second lens group. The specific conditions are satisfied.

REFERENCES:
patent: 4773744 (1988-09-01), Yamanashi
patent: 4840467 (1989-06-01), Takada et al.
patent: 4978204 (1990-12-01), Ito

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