Shielded luminaire

• US 3,885,150 A
• Filed: 12/03/1973
• Issued: 05/20/1975
• Est. Priority Date: 12/03/1973
• Status: Expired due to Term

• Current Assignee: John Nash Ott
• Original Assignee: John Nash Ott
• Inventors: Ott, John Nash
• Primary Examiner(s): Smith, Alfred E.
• Assistant Examiner(s): Punter, Wm. H.
• Application Number:
  US05/421,253
• Time in Patent Office: 533 Days
• Field of Search: 313/112,324,313 240/46.39,46.51,51.11R 174/35MS
• US Class Current: 362/263
• CPC Class Codes: F21V 11/06 using crossed laminae or strips , e.g. grid-shaped louvers; using lattices or honeycombs
• CPC Class Codes: F21V 23/00 Arrangement of electric circuit elements in or on lighting devices characterised by cooling arrangements F21V29/508
• CPC Class Codes: F21V 25/00 Safety devices structurally associated with lighting devices gas- tight or water-tight arrangements F21V31/00; in general F16P; protective circuit arrangements per se H02H7/00

Abstract

An improved radiation shielded luminaire utilizing gas discharge lamps. Shielding of radio frequency radiation is provided by a grounded superimposed screen and louver assembly. Additional shielding around the cathode area of the lamp shields radiation in the frequency ranges of x-ray and infrared radiation.

Claims

1. A shielded luminaire comprising:

a housing formed of conductive material having a light-emitting opening therein, a gas discharge type lamp mounted within said housing so as to project light through said opening, a light shielding louver assembly extending over said opening, said assembly comprising a plurality of crossed fins formed of conductive material which form cells through which light from said lamp passes, a mesh screen formed of crossed conductive strands extending across said opening between said lamp and said louver assembly, and connecting means electrically connecting to ground potential said housing, louver assembly and screen, the area of the screen mesh being sufficient to permit passage of light therethrough but smaller than the cell area of the louver assembly whereby RF radiation from said lamp is attenuated over an extended frequency range by action of the grounded screen and louver assembly while permitting passage of light from said lamp through the screen mesh and louver cells into the area illuminated by said lamp.

2. The shielded luminaire of claim 1 wherein the screen is supported by the louver assembly.

3. The shielded luminaire of claim 1 including radiation shields extending around the cathode areas of the lamp.

4. The shielded luminaire of claim 1 wherein the conductive strands of the screen are formed of a highly reflective material which will reflect light from the lamp without spectral distortion.

5. The shielded luminaire of claim 4 wherein the conductive strands of the screen are formed of a material comprising aluminum.