Metal halide gas discharge lamp for projection purposes
First Claim
Patent Images
1. A metal halide gas discharge lamp (1) for projection purposes, having a translucent discharge vessel (2) closed on two ends (3);
- an ionizable fill within the vessel;
two opposed electrodes (4) in the vessel, separated by an interelectrode gap, connected to power supply leads (8) carried to the outside; and
a frosting forming a strip-like portion (14) on the circumference of the outer surface of the discharge vessel (2),characterized in thatthe frosted portion (14) is located in alignment with the interelectrode gap, and has a width which is less than or at most equal to the electrode spacing defining said interelectrode gap; and
regions of clear surface of said vessel (2) adjoin each of the edges of the strip-like portion of the frosted outer surface.
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Accused Products
Abstract
A metal halide gas discharge lamp for projection purposes includes a discge vessel closed at both ends preferably has between the electrodes a central frosted partial area applied on the outer surface of the discharge vessel. The relationship 0.1<B≦1, preferably 0.4<B/d<0.8, applies to the quotients of the width B of the frosted partial area by the inter-electrode gap d. The lamp is optionally provided on one or both sides with heat build-up coatings. The lamp advantageously forms a unit with an optical reflector.
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Citations
9 Claims
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1. A metal halide gas discharge lamp (1) for projection purposes, having a translucent discharge vessel (2) closed on two ends (3);
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an ionizable fill within the vessel; two opposed electrodes (4) in the vessel, separated by an interelectrode gap, connected to power supply leads (8) carried to the outside; and a frosting forming a strip-like portion (14) on the circumference of the outer surface of the discharge vessel (2), characterized in that the frosted portion (14) is located in alignment with the interelectrode gap, and has a width which is less than or at most equal to the electrode spacing defining said interelectrode gap; and regions of clear surface of said vessel (2) adjoin each of the edges of the strip-like portion of the frosted outer surface. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification