Hydrogen discharge ultraviolet light source or lamp, and method of its manufacture
First Claim
1. A hydrogen-type discharge lamp havinga lamp bulb (2) of quartz glass defining a bulb axis (1);
- electrodes (6) located in said bulb, at least one of the electrodes including an emitter material comprising an alkaline earth oxide or an alkaline earth oxide mixture;
electrode retention means (3) for retaining the electrodes in said bulb, and formed with a radiation emission window (4) for emission of radiation along a radiation beam axis (10,
310);
a fill including hydrogen, or deuterium, or a mixture of hydrogen and deuterium retained within said bulb (2),and comprising,means for preventing attack on the quartz glass of the lamp bulb by alkaline earth oxides emitted from said at least one electrode in operation of the lamp and for preventing reduction of transmissivity of ultraviolet radiation through said quartz glass, comprisingan element (4, 4'"'"', 37, 37A,
47) having a surface region of borosilicate glass or a glass-like aluminum oxide or a mixture of borosilicate glass and a glass-like aluminum oxide, with a surface region thickness of between about 50 nanometers and 10 micrometers positioned in the path of emission of radiation along said radiation beam axis between said electrodes
96) and said lamp bulb (2) of quartz glass, with said surface region facing the electrodes.
3 Assignments
0 Petitions
Accused Products
Abstract
To protect the quartz of a quartz glass bulb (2) from attack by alkaline earth oxides emitted from electrodes (6) of the lamp, and prevent deterioration of the quartz in use of the lamp with respect to transmission of ultraviolet (UV) radiation, particularly in the short wave length range of 200 nm to 250 nm, boron silicate glass or glass-like aluminum oxide, or a mixture of boron silicate glass and glass-like aluminum oxide is interposed between the quartz bulb (2) and the electrodes. Boron oxide can be applied to the interior of the quartz bulb, and fired thereon to form, for example, a boron silicate glass layer (4) or diffuse into the quartz glass to form a diffusion layer (4'"'"') by suitable selection of firing temperatures. Alternatively, an aperture support element (35, 45) can retain a disk of boron silicate glass or glass-like aluminum oxide positioned between the electrodes and the quartz glass bulb. Such disk elements may be planar or of lensetic shape, positioned transverse to the radiation beam axis (10, 310) or at an angle thereto, to provide for partial transmission and reflection, for example in a dual-beam control or measuring system.
14 Citations
21 Claims
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1. A hydrogen-type discharge lamp having
a lamp bulb (2) of quartz glass defining a bulb axis (1); -
electrodes (6) located in said bulb, at least one of the electrodes including an emitter material comprising an alkaline earth oxide or an alkaline earth oxide mixture; electrode retention means (3) for retaining the electrodes in said bulb, and formed with a radiation emission window (4) for emission of radiation along a radiation beam axis (10,
310);a fill including hydrogen, or deuterium, or a mixture of hydrogen and deuterium retained within said bulb (2), and comprising, means for preventing attack on the quartz glass of the lamp bulb by alkaline earth oxides emitted from said at least one electrode in operation of the lamp and for preventing reduction of transmissivity of ultraviolet radiation through said quartz glass, comprising an element (4, 4'"'"', 37, 37A,
47) having a surface region of borosilicate glass or a glass-like aluminum oxide or a mixture of borosilicate glass and a glass-like aluminum oxide, with a surface region thickness of between about 50 nanometers and 10 micrometers positioned in the path of emission of radiation along said radiation beam axis between said electrodes
96) and said lamp bulb (2) of quartz glass, with said surface region facing the electrodes. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A hydrogen-type discharge lamp having
a lamp bulb (2) of quartz glass defining a bulb axis (1); -
electrodes (6) located in said bulb, at least one of the electrodes including an emitter material comprising an alkaline earth oxide or an alkaline earth oxide mixture; electrode retention means (3) for retaining the electrodes in said bulb, and formed with a radiation emission window (4) for emission of radiation along a radiation beam axis (10,
310);a fill including hydrogen, or deuterium, or a mixture of hydrogen and deuterium retained within said bulb (2), and further comprising means for preventing attack on the quartz glass of the lamp bulb by alkaline earth oxides emitted from said at least one electrode in operation of the lamp and for preventing reduction of transmissivity of ultraviolet radiation through said quartz glass including an element (4, 4'"'"', 37, 37A,
47) having a surface region of borosilicate glass or a glass-like aluminum oxide or a mixture of borosilicate glass and a glass-like aluminum oxide, positioned in the path of emission of radiation along said radiation beam axis between said electrodes
96) and said lamp bulb (2) of quartz glass, with said surface region facing the electrodes;an aperture structure (35,
45) positioned inside the bulb (2) and formed with means permitting passage of emitted radiation along said radiation beam axis (310);and wherein said element comprises a boron silicate glass or a glass-like aluminum oxide essentially disk-like part (37) retained in said structure, and located within said radiation passage means, and including said surface region facing the electrodes (6). - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification