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Two Mirror Light Condenser

IP.com Disclosure Number: IPCOM000082113D
Original Publication Date: 1974-Oct-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 2 page(s) / 31K

Publishing Venue

IBM

Related People

Ludden, RC: AUTHOR

Abstract

An improved condenser for ultraviolet light can be made by using orthogonally arranged mirrors and a beam splitter. The arrangement eliminates the need for quartz lenses, avoids chromatic aberrations and provides an output convergent beam free of obstructional shadows.

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Two Mirror Light Condenser

An improved condenser for ultraviolet light can be made by using orthogonally arranged mirrors and a beam splitter. The arrangement eliminates the need for quartz lenses, avoids chromatic aberrations and provides an output convergent beam free of obstructional shadows.

Light from source lamp 1 is trimmed through a stop 2 to a cone sufficient to cover concave spheroid mirror 3. An interposed beam splitter 4 redirects about 50% of the illumination to a second concave spheroid mirror 5. All emergent light from source 1 finds a mirror but in the reflected light path, the beam splitter transmits 50% of the light from mirror 3 and reflects 50% of the light from mirror 5 toward the source and is therefore lost.

The net efficiency of usefully directed light in the system is about 50%, neglecting absorption losses in the elements. An art work plate 6 and imaging lens 7 can be positioned in the emergent beam.

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