Imaging optical system and apparatus using the same

Details Imaging optical system and apparatus using the same Imaging optical system and apparatus using the same

2005-09-27

2005-09-27

Thompson, Timothy (Department: 2873)

Optical: systems and elements

Lens

Multiple component lenses

C359S772000, C359S773000

Reexamination Certificate

active

06950246

ABSTRACT:
The image forming optical system comprises, in order from an object side, a first lens which is positive meniscus lens having a convex surface directed toward an object side, an aperture stop, a second lens which is positive meniscus lens having a convex surface directed toward an image side, a third lens which is positive meniscus lens having a convex surface directed toward an image side, and a fourth lens which is negative lens, wherein at least one of surfaces of the fourth lens is aspherical and the following condition is satisfied:in-line-formulae description="In-line Formulae" end="lead"?−2.0<φm/φp<0in-line-formulae description="In-line Formulae" end="tail"?where φm represents the power of the fourth lens at the position of the maximum light height and φp represents the power of the fourth lens at the position of the praxis.The third lens and the fourth lens are made of plastic material and the following condition is satisfied:in-line-formulae description="In-line Formulae" end="lead"?15.0<ν3−ν4<40.0in-line-formulae description="In-line Formulae" end="tail"?where ν3represents Abbe's number of the third lens and ν4represents Abbe's number of the fourth lens.

REFERENCES:
patent: 3868173 (1975-02-01), Miles et al.
patent: 4373786 (1983-02-01), Yamada
patent: 5841590 (1998-11-01), Sato
patent: 6195210 (2001-02-01), Tochigi
patent: 58-057106 (1983-04-01), None
patent: 59-034508 (1984-02-01), None
patent: 09-258100 (1997-10-01), None

Affiliated with

Also associated with

Rating

Imaging optical system and apparatus using the same does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Imaging optical system and apparatus using the same, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Imaging optical system and apparatus using the same will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3389602