Color-corrected and temperature-compensated lens having an anoma

Details Color-corrected and temperature-compensated lens having an anoma Color-corrected and temperature-compensated lens having an anoma

1997-10-06

2000-06-27

Epps, Georgia

Optical: systems and elements

Single channel simultaneously to or from plural channels

By partial reflection at beam splitting or combining surface

359649, G02B 2714, G02B 300

Patent

active

060813849

ABSTRACT:
A lens system is constituted by a cemented lens made of anomalous dispersion glass for correcting the secondary spectrum of axial chromatic aberration, and a plastic lens having a temperature-compensating characteristic for compensating for defocusing upon change of the lens system with respect to temperature, thereby satisfactorily correcting color and compensating for temperature at the same time in a simple configuration. The imaging lens for image readout is constituted by eight sheets of lenses L.sub.1 to L.sub.8, in which the fourth lens L.sub.4 and the fifth lens L.sub.5 form a cemented lens made of anomalous dispersion glass, whereas the first lens L.sub.1 is a substantially powerless plastic lens having a temperature-compensating characteristic for compensating for defocusing upon change in the lens system with respect to temperature.

REFERENCES:
patent: 4545654 (1985-10-01), Sato
patent: 5452132 (1995-09-01), Kim
Jap.Unexamined Pat.Pub.No. 4-298709, Oct. 22, 1992, Japan and English language Abstract "Infrared Ray Optical Device".
Jap.Unexamined Pat.Pub.No. 5-34591, Feb. 12, 1993, Japan and English language Abstract "Image Forming Lens for Compensating Temperature Variation".
Jap.Unexamined Pat.Pub.No. 6-34882, Feb. 10, 1994, Japan and English language Abstract "Zoom Lens".
Jap.Unexamined Pat.Pub.No. 6-130267, May 13, 1994, Japan and English language Abstract "Temperature Compensated Optical Device".
Jap.Unexamined Pat.Pub.No. 6-186466, Jul. 8, 1994, Japan and English language Abstract,, Photographing Device Having Temperature Compensation, Jul. 8, 1994.
Jap.Unexamined Pat.Pub.No. 6-265782, Sep. 22, 1994, Japan and English language Abstract, "Projecting Lens Device".

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