Claims
- 1. A double-enveloped arc discharge lamp comprising:
- (a) an outer envelope;
- (b) an arc tube mounted within said outer envelope, said arc tube being subject to burst on rare occasions;
- (c) a light-transmissive shield mounted within said outer envelope and substantially surrounding said arc tube, said shield being subject to being shattered by a burst of said arc tube;
- (d) containment means substantially surrounding said shield, said containment means being capable of containing shards with mass large enough to be likely to cause a rupture of the outer envelope, said containment means being capable of withstanding a temperature of approximately 300.degree. C. and a pressure of approximately 30 atmospheres, said containment means being imbedded in the body of said shield; and
- (e) means for structurally and electrically completing said lamp.
- 2. A double-enveloped arc discharge lamp comprising:
- (a) an outer envelope;
- (b) an arc tube mounted within said outer envelope, said arc tube being subject to burst on rare occasions;
- (c) a light-transmissive shield mounted within said outer envelope and substantially surrounding said arc tube, said shield being subject to being shattered by a burst of said arc tube;
- (d) containment means mounted within said outer envelope and substantially surrounding said shield, said containment means being capable of containing shards with mass large enough to be likely to cause a rupture of the outer envelope, said containment means being capable of withstanding a temperature of approximately 300.degree. C. and a pressure of approximately 30 atmsopheres;
- (e) means for structurally and electrically completing said lamp;
- (f) said containment means being a mesh formed from light-reflecting metal wire;
- (g) the diameter of said metal wire being approximately 0.005 inches or greater;
- (h) the size of said mesh ranging between eight and twenty stitches per inch inclusive; and
- (i) the luminous efficacy of said lamp is reduced by less than five percent because of the presence of said mesh.
- 3. A lamp as described in claim 2 wherein said shield has an elongated cylindrical body with a dome at one end an opening at the other end.
- 4. A lamp as described in claim 2 wherein said shield has an elongated cylindrical body with openings at both ends.
- 5. A lamp as described in claim 2 wherein said mesh is loosely woven.
- 6. A lamp as described in claim 2 wherein said loosely woven mesh is mounted on said shield by means of elastic and adhesive forces exerted on said shield by said mesh itself.
- 7. A lamp as described in claim 2 wherein said shield is formed from quartz glass.
- 8. A lamp as described in claim 2 wherein said light-reflecting metal wire is stainless steel.
- 9. A lamp as described in claim 2 wherein said arc tube is single-ended.
- 10. A lamp as described in claim 2 wherein said arc tube is double-ended.
- 11. A lamp as described in claim 2 wherein said lamp is a metal-halide arc dicharge lamp.
- 12. A lamp as described in claim 2 wherein said lamp is a high-pressure sodium arc discharge lamp.
Parent Case Info
This is a continuation of co-pending application Ser. No. 744,645 filed on June 13, 1985, which is a continuation of Ser. No. 422,312, filed on Sept. 23, 1982 now abandoned.
US Referenced Citations (4)
Continuations (2)
|
Number |
Date |
Country |
Parent |
744645 |
Jun 1985 |
|
Parent |
422312 |
Sep 1982 |
|