Scanner lens for reading

Details Scanner lens for reading Scanner lens for reading

1992-04-10

1994-02-08

Arnold, Bruce Y.

Optical: systems and elements

Lens

With light limiting or controlling means

359760, 359775, G02B 908, G02B 962

Patent

active

052853195

ABSTRACT:
A scanner lens for reading has first to fourth lens groups sequentially arranged from an object side to an image side. The first to fourth lens groups are constructed by six lenses. Each of the six lenses is constructed by a positive or negative meniscus lens having a convex or concave face directed on the object side. The scanner lens further has a diaphragm arranged between the second and third lens groups. Refractive indices N.sub.g, N.sub.F, N.sub.d and N.sub.C at respective wavelengths on lines g, F, d and C, an Abbe's number .nu. on line d, and a partial dispersion ratio .theta.=(N.sub.g -N.sub.d)/(N.sub.F -N.sub.C) satisfy the following condition,

REFERENCES:
patent: 3922071 (1975-11-01), Kitagawa et al.
patent: 4364644 (1982-12-01), Ikemori

Affiliated with

Also associated with

Rating

Scanner lens for reading does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Scanner lens for reading, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Scanner lens for reading will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-702281