Indicator element

• US 5,349,509 A
• Filed: 02/18/1993
• Issued: 09/20/1994
• Est. Priority Date: 02/28/1992
• Status: Expired due to Term

• Current Assignee: EBT Licht-Technik GmbH
• Original Assignee: EBT Licht-Technik GmbH
• Inventors: Klug, Georg
• Primary Examiner(s): Lazarus, Ira S.
• Assistant Examiner(s): HEYMAN, LEONARD
• Application Number:
  US08/019,434
• Time in Patent Office: 579 Days
• Field of Search: 362/800, 362/310, 362/308, 362/327, 362/329, 362/362, 362/364, 362/365, 362/368
• US Class Current: 362/362
• CPC Class Codes: F21W 2111/00 Use or application of lighting devices or systems for signalling, marking or indicating, not provided for in codes F21W2102/00 – F21W2107/00
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: G09F 9/307 being incandescent filaments G09F9/302 takes precedence; incandescent panels comprising a number of separate incandescent bodies, per se H01K9/00
• CPC Class Codes: G09F 9/33 being semiconductor devices, e.g. diodes
• CPC Class Codes: H01L 25/13 the devices being of a type provided for in group H01L33/00
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/0002 Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
• CPC Class Codes: H01L 33/483 Containers
• CPC Class Codes: H01L 33/58 Optical field-shaping elements

Abstract

An indicator element comprising a light permeable cap (6) having a light source (26, 50) at least partially disposed therein, and a protective sleeve (32) with connecting conductors (54, 55) for the light source (26, 50) disposed in the interior thereof, the cap (6) and the protective sleeve (32) being at least partially surrounded by and fastened in a sleeve (2) in such a way that with a compact construction, a reliably operating signal of sufficient brightness is assured and the safety requirements for direct connection to line voltage are satisfied.

Claims

1. An indicator element comprising a light permeable cap (6), a light source (26, 50) arranged to direct light through said cap, a protective sleeve (32) axially arranged with respect to said cap in an inner chamber of which connecting conductors (54, 55) for said light source (26, 50) extend, an outer sleeve (2) at least partially surrounding said cap (6) and said protective sleeve (32), said cap (6) and said protective sleeve (32) being fastened in said outer sleeve (2);

wherein said outer sleeve is provided with an external thread (16) and has a radially outwardly extending, rearwardly facing contact surface (14), said external thread directly adjoining said contact surface.

2. An indicator element comprising:

a light permeable cap (6);

a light source (26,

     50) arranged to direct light through said cap;

a protective sleeve axially arranged with respect to said cap in an inner chamber of which connecting conductors (54,

     55) for said light source extend;

a fitting in which said light source is mounted, said fitting having a radial flange;

an outer sleeve provided with an annular step in the interior thereof a surface of which is directed radially outward, said outer sleeve substantially surrounding said cap and at least partially surrounding said protective sleeve;

wherein said radial flange of said fitting is axially fastened between said annular step and an axial front end face of said protective sleeve; and

wherein an annular contact surface having an axial length is provided between said fitting and an interior surface of said protective sleeve, said annular contact surface extending along its axial length between said inner chamber and said axial front end face of said protective sleeve.

3. An indicator element according to claim 2, wherein the light source is at least partially disposed in said cap.

4. An indicator element according to claim 2, wherein said outer sleeve (2) is configured as a reflector.

5. An indicator element according to claim 2, wherein said outer sleeve (2) is substantially cylindrical having front and rear ends both of which are open, the rear end having an inside diameter (21) which is enlarged compared to the front end diameter (19).

6. An indicator element according to claim 5, wherein said cap (6) is provided with a forwardly facing contact surface which abuts said step when said cap is inserted into said sleeve through the rear end thereof, and at least a front part of said protective sleeve (32) has an outside diameter which is substantially the same size as said enlarged inside diameter (21) of said outer sleeve (2).

7. An indicator element according to claim 2, wherein said flange (30) of said fitting (24) is disposed between said axial front end face (44) of said protective sleeve (32) and a rear end surface (27) of said cap (6).

8. An indicator element according to claim 2, wherein said light source is one of a glow discharge lamp (50) and a multiple light emitting diode (26) with at least four LED chips.

9. An indicator element according to claim 2, wherein the protective sleeve (36) is formed of plastic and is configured as a guard against electrical contact with said connecting conductors (28, 29).

10. An indicator element according to claim 2, wherein said protective sleeve (32) has openings (40, 41) in its bottom (38) for means for establishing electrical contact between said connecting conductors and a source of electrical energy.

11. An indicator element according to claim 2, further wherein said fitting (24) is configured as a plastic reflector which extends at least partially into the cap (6).

12. An indicator element according to claim 11, wherein said fitting (24) has a cup-like configuration with a forwardly open conical reflective inside surface (10) and a bottom through which the light source (26, 50) or the connecting conductors (28, 29) extend carried into the interior (34) of said protective sleeve (32).

13. An indicator element according to claim 2, wherein said fitting is formed by a rear end portion of said cap.

14. An indicator element according to claim 13, wherein said protective sleeve (32) lies with said axial front end face (44) directly axially abutting a rear end surface (27) of the cap (6).

15. An indicator element comprising a light permeable cap (6), a light source (26, 50) arranged to direct light through said cap, a protective sleeve (32) axially arranged with respect to said cap in an inner chamber of which connecting conductors (54, 55) for said light source (26, 50) extend, an outer sleeve (2) at least partially surrounding said cap (6) and said protective sleeve (32), said cap (6) and said protective sleeve (32) being fastened in said outer sleeve (2), wherein said cap is provided with a rearwardly extending annular axial extension (57), and the front end of said protective sleeve (32) is provided with a mating recess (58) in which said extension is received in overlapping relation with the front end of the protective sleeve.