Reflection type imaging optical system

Details Reflection type imaging optical system Reflection type imaging optical system

1993-06-25

1997-04-08

Shafer, Ricky D.

Optical: systems and elements

Mirror

Plural mirrors or reflecting surfaces

359859, 359366, 359584, 378 84, 378147, G02B 510, G02B 200

Patent

active

056193823

ABSTRACT:
A reflection type imaging optical system is provided with at least one reflecting mirror, whose reflecting surface is constructed of a plurality of zone areas different from each other in spectral reflectance characteristics. Further, in the optical system, the spectral reflectance characteristics of each zone area are selected so that an incident angle providing the maximum reflectance when a ray of light of a predetermined wavelength is incident on each zone area has a value between the maximum and the minimum of the incident angle in the zone area. The reflection type imaging optical system thus provides an important advantage in practical use in that the reflection efficiency of each reflecting surface is enhanced to bring about the brightness necessary for the imaging surface.

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