Projection unit including glass reflector with insulative cap member
First Claim
1. A projection unit for being positioned within a holder adapted for being electrically connected to the electrical circuitry associated with a projection system, said projection unit comprising:
- a glass reflector having a forward reflecting portion including an internal, substantially concave reflecting surface and an apex portion having an opening therein;
an incandescent lamp including an envelope portion having a filament structure therein and a sealed end portion adjacent said envelope portion and including a pair of spaced-apart lead-in wires projection therefrom, said incandescent lamp positioned within said glass reflector such that said envelope portion of said lamp is located substantially within said forward reflecting portion relative to said concave reflecting surface, and said sealed end portion of said lamp is located substantially within said rear opening within said apex portion; and
a plastic cap member for being positioned within said holder and including an aperture therein, said cap member being fixedly secured to an external surface of said reflecting portion of said glass reflector in an abutting manner immediately adjacent said opening within said apex portion such that said aperture of said plastic cap member is coaxially aligned with the optical axis of said glass reflector to thereby align said plastic cap member in a predetermined manner with said internal substantially concave reflecting surface of said reflector, said sealed end portion of said lamp being centrally disposed within said aperture of said plastic cap member in a fixed manner prior to said fixedly securing of said plastic cap member to said glass reflector and thereby oriented relative to the surfaces of said cap member which abut said glass reflector and also to said internal, substantially concave reflecting surface of said glass reflector so as to be precisely oriented with respect to said reflector, said cap member including a pair of electrical contacts spacedly located therein, each of said electrical contacts electrically connected to a respective one of said lead-in wires projecting from said sealed end portion of said incandescent lamp, said reflecting surface of said glass reflector including a dichroic coating thereon which enables infrared radiation to pass therethrough while reflecting visible light whereby heat from said lamp will pass through said reflecting portion of said reflector.
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Accused Products
Abstract
An improved projection unit including a glass reflector having a forward reflecting portion which includes an internal substantially concave reflecting surface and an apex portion with an opening therein. An incandescent lamp is oriented such that its envelope portion is arranged relative to the reflecting surface of the reflector and its sealed end portion having a pair of spaced apart lead-in wires projecting therefrom is arranged within the reflector'"'"'s opening. An electrically insulative cap member is fixedly secured to an external surface of a glass reflector immediately adjacent the reflector'"'"'s rear opening. The cap member includes a pair of contacts spacedly located therein, each of these contacts being joined electrically to a respective one of the projecting lead-in wires from the incandescent lamp. In a further embodiment of the invention, a holder is provided for providing electrical connection between the projection system'"'"'s circuitry and the incandescent lamp.
40 Citations
28 Claims
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1. A projection unit for being positioned within a holder adapted for being electrically connected to the electrical circuitry associated with a projection system, said projection unit comprising:
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a glass reflector having a forward reflecting portion including an internal, substantially concave reflecting surface and an apex portion having an opening therein; an incandescent lamp including an envelope portion having a filament structure therein and a sealed end portion adjacent said envelope portion and including a pair of spaced-apart lead-in wires projection therefrom, said incandescent lamp positioned within said glass reflector such that said envelope portion of said lamp is located substantially within said forward reflecting portion relative to said concave reflecting surface, and said sealed end portion of said lamp is located substantially within said rear opening within said apex portion; and a plastic cap member for being positioned within said holder and including an aperture therein, said cap member being fixedly secured to an external surface of said reflecting portion of said glass reflector in an abutting manner immediately adjacent said opening within said apex portion such that said aperture of said plastic cap member is coaxially aligned with the optical axis of said glass reflector to thereby align said plastic cap member in a predetermined manner with said internal substantially concave reflecting surface of said reflector, said sealed end portion of said lamp being centrally disposed within said aperture of said plastic cap member in a fixed manner prior to said fixedly securing of said plastic cap member to said glass reflector and thereby oriented relative to the surfaces of said cap member which abut said glass reflector and also to said internal, substantially concave reflecting surface of said glass reflector so as to be precisely oriented with respect to said reflector, said cap member including a pair of electrical contacts spacedly located therein, each of said electrical contacts electrically connected to a respective one of said lead-in wires projecting from said sealed end portion of said incandescent lamp, said reflecting surface of said glass reflector including a dichroic coating thereon which enables infrared radiation to pass therethrough while reflecting visible light whereby heat from said lamp will pass through said reflecting portion of said reflector. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A projection unit for being positioned within a holder adapted for being electrically connected to the electrical circuitry associated with a projection system, said projection unit comprising:
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a glass reflector having a forward reflecting portion including an internal, substantially concave reflecting surface and an extending neck portion having an opening therein; an incandescent lamp including an envelope portion having a filament structure therein and a sealed end portion adjacent said envelope portion and including a pair of spaced-apart lead-in wires projecting therefrom, said incandescent lamp positioned within said glass reflector such that said envelope portion of said lamp is located substantially within said forward reflecting portion relative to said concave reflecting surface, and said sealed end portion of said lamp is located substantially within said opening within said extending neck portion; a plastic cap member for being positioned within said holder and including an aperture therein, said plastic cap member being fixedly secured to an external surface of said reflecting portion of said glass reflector in an abutting manner immediately adjacent said opening within said extending neck portion such that said aperture of said plastic cap member is coaxially aligned with the optical axis of said glass reflector to thereby align said plastic cap member in a predetermined manner with said internal, substantially concave reflecting surface of said reflector, said sealed end portion of said lamp being centrally disposed within said opening within said extending neck portion of said reflector in a fixed manner prior to said fixedly securing of said plastic cap member to said reflecting portion of said glass reflector such that said lamp will be oriented relative to said external surface of said reflector, said plastic cap member thereby being precisely oriented with respect to both said reflector and said lamp during said fixedly securing of said cap member to said reflector, said cap member including a pair of electrical contacts spacedly located therein, each of said electrical contacts electrically connected to a respective one of said lead-in wires projecting from said sealed end portion of said incandescent lamp, said reflecting surface of said glass reflector including a dichroic coating thereon which enables infrared radiation to pass therethrough while reflecting visible light whereby heat from said lamp will pass through said reflecting portion of said reflector. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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Specification