Optical: systems and elements – Single channel simultaneously to or from plural channels – By partial reflection at beam splitting or combining surface
Patent
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.
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Epps Georgia
Fuji Photo Optical Co., Ltd.
Mack Ricky
Snider Ronald R.
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