Reading lens

Details Reading lens Reading lens

1998-07-30

2000-02-22

Epps, Georgia

Optical: systems and elements

Lens

359784, G02B 300

Patent

active

06028711&

ABSTRACT:
Disclosed is a reading lens consisting of one glass lens and first and second plastic lenses. A positive diffraction lens structure being is formed on one surface of the surfaces of the first and second plastic lenses. The positive diffraction lens structure functions at least to compensate a longitudinal chromatic aberration which is caused by refractive power of the glass lens and the first and second plastic lenses.

REFERENCES:
patent: 4863250 (1989-09-01), Ishizuka
patent: 4943146 (1990-07-01), Iizuka
patent: 4974948 (1990-12-01), Arai et al.
patent: 5412510 (1995-05-01), Iizuka et al.
patent: 5629799 (1997-05-01), Maruyama et al.
patent: 5691835 (1997-11-01), Iizuka
patent: 5706141 (1998-01-01), Abe
patent: 5715090 (1998-02-01), Meyers
patent: 5737112 (1998-04-01), Iizuka

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