Browse Prior Art Database

Adjustable Oblique Illumination Ringlight

IP.com Disclosure Number: IPCOM000110288D
Original Publication Date: 1992-Nov-01
Included in the Prior Art Database: 2005-Mar-25
Document File: 3 page(s) / 133K

Publishing Venue

IBM

Related People

Adams, EM: AUTHOR [+3]

Abstract

Described is a hardware implementation for an adjustable oblique illumination ringlight. The adjustability of the oblique illumination provides uniform, as well as a variable, angle of illumination to enable the user to have the capability of adjusting the angle of incident light striking the target without changing the working distance.

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This is the abbreviated version, containing approximately 52% of the total text.

Adjustable Oblique Illumination Ringlight

       Described is a hardware implementation for an adjustable
oblique illumination ringlight.  The adjustability of the oblique
illumination provides uniform, as well as a variable, angle of
illumination to enable the user to have the capability of adjusting
the angle of incident light striking the target without changing the
working distance.

      In prior art, fiber-optic ringlights consisted of hundreds of
fiber-optic fibers arranged in a circular pattern with its output
beam fixed at an oblique angle.  This fixed angle was not always the
desired angle of illumination.  Other ringlights consisted of several
optic probes which were angled in any orientation.  However, these
were awkward to adjust and did not provide uniform illumination.

      The concept described herein is intended for use in oblique
illumination applications with the capability of adjusting the output
beam so as to provide uniform illumination as well as a variable
angle of illumination.  The adjustable oblique illumination ringlight
is similar to the prior-art version that had all of the fibers
mounted at a fixed angle, but enabled the user to vary the angle of
illumination.

      Fig. 1 shows a cut-away view of the ringlight, and Fig. 2 is a
cross-sectional view of the circular ringlight showing the relative
position of the various elements.  The ringlight, as shown in both
figures, consists of circular fibers 1 mounted perpendicular to
circular ringlight housing assembly 2.  Highly reflective circular
band 3 is mounted inside the ringlight at a fixed angle of 45 degrees
with respect to the optical path of the light source.  Multi-faceted
mirrors 4 are in a circular arrangement with a mechanical adjustment
that will change the angle with respect to the beam reflected from
reflective circular band 3 so that it will alter the angle of
reflection of the output beam.  If the faces of reflective circular
band 3 and multi-faceted mirrors 4 are parallel, the resulting beam
will be deflected in a vertical direction.  Therefore, any oblique
angle of illumination is obtained simply by adjusting the angle of
multi-faceted mirror 4.

      There are several methods that can be used to implement the
adjustable oblique illumination ringlight.  One method would be to
take the...