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DISCHARGE LAMP WITH FORWARD OFFSET ARC TUBE

IP.com Disclosure Number: IPCOM000024135D
Original Publication Date: 1979-Oct-31
Included in the Prior Art Database: 2004-Apr-02
Document File: 2 page(s) / 312K

Publishing Venue

Xerox Disclosure Journal

Abstract

A jacketed discharge lamp, consisting of an arc tube concentrically located within an apertured reflectorized jacket, exhibits a directed emission of energy. The purpose of the apertured reflector is to increase the forward brightness of the lamp. The resulting brightness, however, is not uniform across the aperture. It has been shown that the radiance (brightness) of the reflectorized wall is much less

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XEROX DISCLOSURE JOURNAL

DISCHARGE LAMP WITH FORWARD OFFSET ARC TUBE
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Proposed Classification U~S~CL 313/18
Int~Cl. HOlj 1/02

A

FIG. /

FIG. 2

Volume 4 Number 5 September/October 1979 633

[This page contains 1 picture or other non-text object]

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DISCHARGE LAMP WITH FORWARD OFFSET ARC TUBE (Cont'd)

A jacketed discharge lamp, consisting of an arc tube concentrically located within an apertured reflectorized jacket, exhibits a directed emission of energy. The

purpose of the apertured reflector is to increase the forward brightness of the lamp. The resulting brightness, however, is not uniform across the aperture. It has been shown that the radiance (brightness) of the reflectorized wall is much less

than the radiance of the arc tube. The influence of the apertured reflector on the radiated profile is such that an irradiated point in space, located off normal with respect to the plane of the aperture, can have its "view~of the arc tube partially or

totally obstructed by the reflector depending on its location. This has the effect of reducing the apparent brightness of the lamp aperture as the point of view moves further from the normal. Although of no consequence in some illumination systems, this effect clearly becomes a disadvantage in systems utilizing a reflector on the opposite side of the optical path for the added imaging of the source at the

document.

For such cases and others where it may be desirable to direct a greater portion of the energy fr...