Sealed beam high intensity xenon lamp with cooling structure

Claim 2

In combination a high intensity lamp and a housing therefore, said housing comprising a light transmissive shell and a metallic reflector shell, said lamp being mounted in a central position between said two shells, the outer rims of said shells being sealed together, said reflector shell having an enclosed central tubular neck and a plurality of external ducts, said ducts including a plurality of thermally conductive fins protruding from the exterior of said reflector shell and extending radially and outwardly from said central neck toward said outer rims, an outer shell engaging and covering said plurality of protruding fins and having a central tubular opening concentric with said tubular neck providing an inlet for a coolant and a peripheral opening around said outer rims providing an outlet for said coolant, said fins providing substantially uniform passages for said coolant extending radially between said reflector and outer shells from said neck to said rims.

Claim 3

The combination of a lamp and a housing in accordance with claim 1, wherein each said light transmissive shell and said reflector shell respectively has a tubular neck at the central portion thereof, said high intensity lamp is a short arc xenon gas discharge lamp having two end sections mounted within opposite central tubular neck portions and an elongated tubular quartz envelope having a central gaseous discharge section between said end sections, a cathode electrode mounted in the end section within said light transmissive shell and extending into said tubular quartz envelope, an anode electrode mounted in the opposite end section within said reflector shell and extending into said tubular quartz envelope, said electrodes being spaced from each other within said envelope to form an arc discharge gap therebetween, a tubular conductive cap covering the neck portion of said reflector shell and connected to said anode electrode and a cathode connection extending externally through said neck portion of said light transmissive shell.

Claim 4

The combination of a lamp and a housing in accordance with claim 2 wherein said reflector and outer shells are of substantially parabolic shape, said arc discharge gap being positioned at the focal point of said parabolic reflector.

Claim 5

In combination a high intensity lamp and a housing in accordance with claim 2, including a spacer interposed between the protruding neck portion of said reflector shell and the end section of said tubular quartz envelope, said spacer being resilient to allow thermal contraction and expansion of said quartz envelope and said tubular conductive cap.

Claim 6

In combination a high intensity lamp and a housing in accordance with claim 4, including means for directing cooling fluid into and through said plurality of ducts from the protruding neck toward the outer rim.

Claim 7

In combination a high intensity lamp and a housing in accordance with claim 5, wherein said reflector shell is of a thermally conductive sheet metal, and said plurality of fins are made of a thermally conductive metal; said fins being jointed to the exterior of said reflector with aluminum seams for increasing thermal heat dissipation.

Claim 8

In combination a high intensity lamp and a housing therefor in accordance with claim 6, wherein said fins are integral parts of said reflector shell.

Claim 9

In combination a high intensity lamp and a housing in accordance with claim 7, wherein said light transmissive shell is a relatively heavy clear glass lens with a ground outer rim, and an epoxy cement hermetically sealing said outer rim of said glass to the outer rim of said parabolic reflector shell.

Claim 10

In combination a high intensity lamp and a housing in accordance with claim 8 wherein the interior surface of said reflector shell includes a layer of vaporized silver deposited thereon for providing a high reflective surface.

Claim 11

In combination a high intensity lamp and a housing in accordance with claIm 8, including a multi-layer interference filter disposed on the interior surface of said reflector shell for focusing the visible spectrum of the light being emitted from said lamp toward said light transmissive shell and for transmitting infra-red radiant heat through said reflector shell.

Claim 12

In combination a high intensity lamp and a housing in accordance with claim 8, wherein the space between said housing and said lamp envelope is filled with an inert gas below atmospheric pressure.