Small imaging lens and imaging apparatus

Details Small imaging lens and imaging apparatus Small imaging lens and imaging apparatus

2006-09-19

2006-09-19

Harrington, Alicia M (Department: 2873)

Optical: systems and elements

Lens

Including a nonspherical surface

C359S753000, C359S754000

Reexamination Certificate

active

07110188

ABSTRACT:
An imaging lens includes sequentially, from an object side, a first lens group, a second lens group, a third lens group, and a fourth lens group. The first lens group includes only a first lens having a meniscus shape with a concave surface facing the object side. The second lens group has positive refracting power as a whole and includes sequentially, from the object side, a second-first lens having positive refracting power and a second-second lens cemented to or separated from the second-first lens and having negative refracting power. The third lens group includes only a third lens having a meniscus shape with a concave surface facing the object side. The fourth lens group includes only a fourth lens.

REFERENCES:
patent: 5726810 (1998-03-01), Meyers
patent: RE35775 (1998-04-01), Betensky et al.
patent: 6476982 (2002-11-01), Kawakami
patent: 2002-228922 (2002-08-01), None

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