초록 ▼

A discharge lamp is disclosed, which comprises a discharge vessel sealed in a tubular envelope. The lamp has a lamp base covering an end part of the envelope, and fixing means for providing a substantially rigid fixing of the envelope to the lamp base. The fixing means comprises a metal clamp ring,

A discharge lamp is disclosed, which comprises a discharge vessel sealed in a tubular envelope. The lamp has a lamp base covering an end part of the envelope, and fixing means for providing a substantially rigid fixing of the envelope to the lamp base. The fixing means comprises a metal clamp ring, which surrounds a part of the envelope external to the lamp base. A melt plastic lining is provided between the clamp ring and the envelope. The melt plastic lining substantially completely fills a space between the envelope and the clamp ring. A method is also provided for manufacturing a discharge lamp as above. The method comprises the steps of providing a space between the clamp ring and the envelope, and providing a hot-melt plastic lining in the space between the clamp ring and the envelope. Subsequently, the plastic lining is melted, and substantially completely fills the space between the clamp ring and the envelope, establishing a tight and stable mechanical connection between the clamp ring and the envelope.

대표청구항 ▼

What is claimed is: 1. A discharge lamp, comprising: a discharge vessel sealed in a tubular envelope; a lamp base covering an end part of the envelope; and fixing means for providing a substantially rigid fixing of the envelope to the lamp base, the fixing means comprising: a metal clamp ring surro

What is claimed is: 1. A discharge lamp, comprising: a discharge vessel sealed in a tubular envelope; a lamp base covering an end part of the envelope; and fixing means for providing a substantially rigid fixing of the envelope to the lamp base, the fixing means comprising: a metal clamp ring surrounding a part of the envelope external to an outer surface of the lamp base, an internal surface of the clamp ring and an external surface portion of the envelope defining a surrounding space between the envelope and the clamp ring, the inner diameter of the clamp ring being positively larger than the corresponding outer diameter of the envelope, so that the space between the envelope and the clamp ring substantially completely surrounds the envelope, and a melt plastic lining external to the outer surface of the lamp base between the internal surface of the clamp ring and the external surface portion of the envelope, the melt plastic lining substantially completely filling the space between the envelope and the clamp ring. 2. The discharge lamp of claim 1, in which softening temperature of the plastic lining is higher than 260째 C. 3. The discharge lamp of claim 1, in which the plastic lining is made of a polyether-ether-ketone (PEEK) material. 4. The discharge lamp of claim 1, in which the clamp ring is fixed to the lamp base with metal legs. 5. The discharge lamp of claim 4, in which the legs are welded to an external surface portion of the clamp ring. 6. The discharge lamp of claim 4, in which the legs are integral with the clamp ring. 7. The discharge lamp of claim 4, in which an end of the metal legs are pressed into corresponding receiving slots of the lamp base. 8. The discharge lamp of claim 4, in which the lamp base is molded around an end of the metal legs. 9. A method for manufacturing a discharge lamp, the discharge lamp comprising: a discharge vessel sealed in a tubular envelope, a lamp base covering an end part of the envelope, fixing means for providing an essentially rigid fixing of the envelope to the lamp base, the fixing means comprising a metal clamp ring surrounding a part of the envelope external to an outer surface of the lamp base, the clamp ring and the envelope defining a surrounding space between the envelope and the clamp ring, the inner diameter of the clamp ring being positively larger than the corresponding outer diameter of the envelope, so that the space between the envelope and the clamp ring substantially completely surrounds the envelope, the method comprising the steps of: providing a hot-melt plastic lining external to the outer surface of the lamp base in the space between the clamp ring and the envelope, melting the plastic lining and substantially completely filling the space between the clamp ring and the envelope. 10. The method of claim 9, further comprising the steps of: inserting the plastic lining in the clamp ring, and thereafter inserting the envelope in the clamp ring. 11. The method of claim 9, further comprising the steps of: adjusting a position of the envelope relative to the lamp base before melting the plastic lining, and after the melting of the plastic lining, retaining the adjusted position of the envelope relative to the lamp base during a cooling period of the plastic lining. 12. The method of claim 9, in which the melting of the plastic lining is effected with at least one of (i) infrared radiation (ii) heating flame or (iii) HF electromagnetic field. 13. A fixture arrangement for fixing an envelope of a discharge lamp to a lamp base, comprising: a metal clamp ring external to an outer surface of the lamp base for surrounding a part of a tubular envelope external to the outer surface of the lamp base, an internal surface of the clamp ring being concentrically spaced from an external surface portion of the envelope thereby defining a concentric space between the envelope and the clamp ring, the space substantially completely surrounds the envelope, the clamp ring comprising a hot-melt plastic lining which when melted substantially completely filling the space between the envelope and the clamp ring; and legs attached to the clamp ring with a first end and a second end of the legs extending away from the clamp ring, for insertion into the lamp base, the second ends of the legs being secured to an inner surface of the lamp base. 14. The fixture arrangement of claim 13, in which the legs are welded to an external surface portion of the clamp ring. 15. The fixture arrangement of claim 13, in which the legs are integral with the clamp ring.