Lighting method and apparatus having a variable illuminated fiel

Details Lighting method and apparatus having a variable illuminated fiel Lighting method and apparatus having a variable illuminated fiel

1994-03-18

1996-12-17

Thorpe, Timothy

Illumination

Light source and modifier

Plural serial lens elements or components

362277, 362319, 359794, F21M 100

Patent

active

055845681

ABSTRACT:
A lighting apparatus has a lighting filament (3), a first lens (1) disposed at a fixed distance from the filament (3), divergent light from the filament falling directly on the first lens (1) which reduces but does not eliminate the divergence of the light in all directions about the optical axis upon passage of light through the first lens, and a sleeve (12) carrying a second lens (2) mounted for sliding movement relative to the box. The second lens (2) receives divergent light directly from the first lens (1) and reduces the divergence of the light upon passage of the light through the second lens, the focal length of the second lens being greater than 1 1/2 times the focal length of the first lens and the distance between the lenses being less than 1 1/2 times the focal length of the first lens. The illumination pattern is high-intensity but does not have a sharp contour so that it may be used in a surgical operating room.

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