Lamp and housing assembly

Claim 2

In combination with a lamp having an envelope including an elongated lead-seal extending externally of a bulb portion of the envelope, the improvement comprising a heat-confining member positioned at least partially around and spaced from said leadseal thereby defining a heat-confining airspace along said leadseal, said heat-confining airspace being substantially devoid of any matter except air and thereby being adapted to increase the uniformity of temperature gradient along said lead-seal when said lamp is operating.

Claim 3

A combination as claimed in claim 1, in which said heat-confining member is of hollow cylindrical configuration and is positioned around said lead-seal.

Claim 4

In a lamp and mounting arrangement wherein said mounting comprises a member having an opening therein and said lamp comprises an envelope including an elonGated lead-seal extending externally of a bulb portion of the envelope and positioned axially with respect to said opening, the improvement comprising a heat-confining member of substantially hollow cylindrical shape positioned in said opening and extending therefrom so as to be spaced from and at least partly surround said elongated lead-seal of the lamp thereby defining a heat-confining airspace along said lead-seal, said heat-confining airspace being substantially devoid of any matter except air and thereby being adapted to increase the uniformity of temperature gradient along said lead-seal when said lamp is operating.

Claim 5

In a lamp and mounting arrangement wherein said mounting comprises a member having an opening therein and said lamp comprises an envelope including an elonGated lead-seal extending externally of a bulb portion of the envelope and positioned axially with respect to said opening, the improvement comprising a heat-confining member of substantially hollow cylindrical shape positioned in said opening and extending therefrom so as to be spaced from and at least partly surround said elongated lead-seal of the lamp thereby defining a heat-confining airspace along said lead-seal, said heat-confining airspace being substantially devoid of any matter except air and thereby being adapted to increase the uniformity of temperature gradient along said lead-seal when said lamp is operating.

Claim 6

An arrangement as claimed in claim 3, in which a portion of said mounting member extends substantially parallel to and spaced from said elongated lead-seal, and in which said heat-confining member comprises a resilient split sleeve fitted resiliently in said opening, said split sleeve being oriented so that the split thereof faces toward and is adjacent to said portion of the mounting member whereby said portion of the mounting member aids in confining heat at said split.

Claim 7

An arrangement as claimed in claim 4, in which said split sleeve is provided with one or more tabs extending laterally outwardly at an end thereof and seated against said mounting member adjacent to said opening thereby positioning said split sleeve axially in said opening.

Claim 8

An arrangement as claimed in claim 3, in which a portion of said mounting member extends substantially parallel to and spaced from said elongated lead-seal and in which said heat-confining member is beveled at the end thereof extending from said opening, said heat-confining member and the bevel thereof being oriented so that the shorter length of said heat-confining member faces toward and is adjacent to said extending portion of the mounting member whereby said portion of the mounting member aids in confining heat at said beveled end of the heat-confining member.

Claim 9

An arrangement as claimed in claim 6, in which said heat-confining member comprises a resilient split sleeve having a split in the wall thereof along the shorter length thereof whereby said portion of the mounting member aids in confining heat at said split.

Claim 10

An arrangement as claimed in claim 6, in which said heat-confining member is provided with one or more tabs extending laterally outwardly at the end thereof opposite from said beveled end and seated against said mounting member adjacent to said opening thereby positioning said heat-confining member axially in said opening.

Claim 11

An arrangement as claimed in claim 8, including cement interposed in the space between said lead-seal region and the inside of said heat-confining member at the region of said opening in the housing member.

Claim 12

In a lamp and reflector arrangement comprising a concave reflector provided with a pair of opposed lateral anode and cathode openings in the wall thereof on a line normal to the optical axis and passing substantially through its focus, and an elongated lamp comprising a bulb portion and anode and cathode stems extending from said bulb portion on opposite sides thereof and terminating in anode and cathode lead-seals, respectively, said lamp being positioned in said reflector along said line and attached to said reflector at said openings, said anode stem comprising a lead-seal region located at least partly within said reflector and outside of the confines of the reflector anode opening, the improvement comprising a hollow cylindrical heat-confining member mounted in said anode opening and extending within said reflector and spaced from and substantially surrounding said anode lead-seal region thereby defining a heat-confining space along said lead-seal region adapted to increase the uniformity of temperature gradient along said lead-seal region when said lamp is operating.

Claim 13

In a lamp and reflector arrangement comprising a concave reflector provided with a pair of opposed lateral anode and cathode openings in the wall thereof on a line normal to the optical axis and passing substantially through its focus, and an elongated lamp comprising a bulb portion and anode and cathode stems extending from said bulb portion on opposite sides thereof and terminating in anode and cathode lead-seals, respectively, said lamp being positioned in said reflector along said line and attached to said reflector at said openings, said anode stem comprising a lead-seal region located at least partly within said reflector and outside of the confines of the reflector anode opening, the improvement comprising a hollow cylindrical heat-confining member mounted in said anode opening and extending within said reflector and spaced from and substantially surrounding said anode lead-seal region thereby defining a heat-confining space along said lead-seal region adapted to increase the uniformity of temperature gradient along said lead-seal region when said lamp is operating.

Claim 14

An arrangement as claimed in claim 10, in which said heat-confining member comprises a split sleeve oriented with the split thereof toward the back of the reflector whereby said reflector aids in confining heat at said split.

Claim 15

An arrangement as claimed in claim 10, in which the end of said heat-confining member within said reflector is beveled, said beveled heat-confining member being oriented so that the short side thereof is toward the back of the reflector whereby said reflector aids in confining heat at said beveled end of the heat-confining member.