Illumination optical system that uses a solid-state lighting...

Details Illumination optical system that uses a solid-state lighting... Illumination optical system that uses a solid-state lighting...

2007-05-14

2010-06-29

Harrington, Alicia M (Department: 2873)

Optical: systems and elements

Single channel simultaneously to or from plural channels

By partial reflection at beam splitting or combining surface

C359S589000, C353S084000

Reexamination Certificate

active

07746560

ABSTRACT:
An illumination optical system for use in a microscope or electronic endoscope includes a solid-state lighting element that generates light having a spectral profile with peak intensities at multiple wavelengths such that the light output by said solid-state lighting element is perceived by an observer as being white in color, and a wavelength distribution conversion element having a spectral transmittance profile that includes specified wavelength regions within which the transmittance is nearly constant with increasing wavelength so as to form a step of nearly even intensity, and having specified wavelength regions within which the transmittance changes with increasing wavelength so as to form a transition region. By the combined effect of the solid-state lighting element and the wavelength distribution conversion element, the wavelength distribution of the light generated by the illumination optical system more closely resembles the wavelength distribution of daylight than the light generated by the solid-state lighting element.

REFERENCES:
patent: 6674575 (2004-01-01), Tandler et al.
patent: 7597447 (2009-10-01), Larson et al.
patent: 2002-543453 (2002-12-01), None
patent: 2005-148296 (2005-06-01), None
patent: WO 00/65398 (2000-11-01), None

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