Illumination – Light source and modifier – Plural serial lens elements or components
Patent
1989-12-22
1991-02-19
Husar, Stephen F.
Illumination
Light source and modifier
Plural serial lens elements or components
362226, 362293, 362294, 362804, F21V 1300
Patent
active
049949454
ABSTRACT:
A lamp for providing uniform luminosity in an area to be illuminated, such as in an operating theatre and the like. The lamp comprises a light source, an infrared filter element, a planar prism field, having a substantial number of radial sectors containing a plurality of transverse, outwardly curved prisms, and a toroidal lens system which controls the divergence of the light emanating from the light source so as to render the light substantially columnate and to direct the light onto the planar prism field, a transparent member beneath the planar prism field to protect the planar prism field from dirt, foreign material and scratches, and a handle extending downwardly from the face of the lamp by which the lamp can be manipulated. The radial sectors are held together in the planar prism field by attachment to one another. As a result, the transparent member can be thin since it is not required to support the planar prism field. The transparent member, therefor, can be removed for cleaning or replacement without disassembly of the planar prism field. The lens of the toroidal lens system is a conical Fresnel lens.
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O'Shea Donald C.
Oliver James L.
Sketo James L.
Husar Stephen F.
Kirschner Medical Corporation
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