Imaging lens

Details Imaging lens Imaging lens

1997-04-24

1998-11-10

Dang, Hung X.

Optical: systems and elements

Lens

Multiple component lenses

359717, G02B 904

Patent

active

058352880

ABSTRACT:
In a configuration constituted by two lens sheets, the ranges of levels of refractive index n and Abbe number .nu. of the image-side lens made of a biconvex lens are specified in order to realize an imaging lens constituted by two lens sheets which can attain a long back focus, a relatively wide angle of view, a high brightness, a small size, and a lower manufacturing cost. The imaging lens comprises, successively disposed from the object side to the image side, a concave lens and a biconvex lens, while at least one surface of the concave lens is an aspheric surface. Also, assuming that the refractive index and Abbe number of the biconvex lens are respectively n and .nu., the following conditional expressions (1) and (2):

REFERENCES:
patent: 2889745 (1959-06-01), Hayes et al.
patent: 3912379 (1975-10-01), DeJager
patent: 4542961 (1985-09-01), Sato
patent: 5327291 (1994-07-01), Baker et al.
patent: 5521761 (1996-05-01), Morooka
patent: 5615051 (1997-03-01), Takato
patent: 5617255 (1997-04-01), Yamada

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