Apparatus for dark field illumination

Details Apparatus for dark field illumination Apparatus for dark field illumination

1979-11-30

1981-09-29

Corbin, John K.

350 84, G02B 2106

Patent

active

042919380

ABSTRACT:
Apparatus for dark field illumination consisting of light conducting fibers having end faces arranged within an annular region which is coaxial with the optical axis of an optical assembly, such as a microscope objective. The annular region is within the numerical aperture of the optical assembly and is positioned in the rear focal plane thereof so that light emitted by the fibers becomes dark field illumination for the object plane of the optical assembly when viewed through the central aperture of the annular region. Illumination of the object plane through the central aperture also dark field illuminates the object plane when viewed through the fibers. This is true even when the object plane is illuminated in only a small area by forcussing an illumination source through the central aperture and onto the object plane.

REFERENCES:
Green et al., "Magneto-Optic Detection of Ferromagnetic Domains Using Vertical Illumination", J. of Sci. Inst., vol, 39, No. 5, pp. 244-245, 5/62.
H. Appelt, Einfuhrung In Die Mikroskopischen Untersuchungsmethoden, 4th Ed. (Akademische Verlagsgesellschaft Geest & Portig K.-G. Leipsig 1959, pp. 103-108.
H. Naumann, Optik Ur Konstrukteure, (Wilhelm Knapp Verlag, Dusseldorf 1960) pp. 128-135.

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