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REFLECTION TYPE MICROSCOPE OBJECTIVE LENS, PROJECTING AND VERTICAL ILLUMINATING DEVICE FOR REFLECTION TYPE MICROSCOPE HAVING THIS OBJECTIVE LENS AND REFLECTION TYPE MICROSCOPE SYSTEM HAVING THIS OBJECTIVE LENS
REFLECTION TYPE MICROSCOPE OBJECTIVE LENS, PROJECTING AND VERTICAL ILLUMINATING DEVICE FOR REFLECTION TYPE MICROSCOPE HAVING THIS OBJECTIVE LENS AND REFLECTION TYPE MICROSCOPE SYSTEM HAVING THIS OBJECTIVE LENS
PURPOSE:To obtain the lens which has a large numerical aperture, a small central shielding rate and a high resolution by constituting the objective lens of two concave mirrors, a plane mirror and a convex mirror and forming this lens so as to satisfy prescribed conditions. CONSTITUTION:The reflected light from an object surface is reflected by the concave mirror L14, the plane mirror L13, the concave mirror L12, and the con cave mirror L11 in this order, by which images are formed. These mirrors are so formed as to satisfy the conditions to attain ¦u¦¦u'¦ when the angle formed by the incident ray on the concave mirror L14 with the optical axis is designated as u and the angle formed by the reflected ray with the optical axis as u'. The large numerical aperture is, therefore, obtd. with the reflecting mirror having a large F-number and since the resolving power of the lens is inversely proportional to the numerical aperture, the high resolving power is obtd. The central shielding rate epsilon is decreased to =20% as against 40 to 50% of the conventional lenses by adequately selecting the lens diameter and spacing.
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