Lamp and end cap for a lamp

• US 20130021809A1
• Filed: 04/08/2011
• Published: 01/24/2013
• Est. Priority Date: 04/08/2010
• Status: Active Grant

• Current Assignee: LEDVANCE GmbH (MLS Co. Ltd.)
• Original Assignee: OSRAM Licht AG (Ams-Osram AG)
• Inventors: Dellian, Harald, Otzen, Stefan
• Granted Patent: US 8,636,391 B2
• Time in Patent Office: Days
• US Class Current: 362/457
• CPC Class Codes: F21K 9/272 Details of end parts, i.e. the parts that connect the light source to a fitting; Arrangement of components within end parts F21K9/278 takes precedence
• CPC Class Codes: F21V 23/06 the elements being coupling devices , e.g. connectors
• CPC Class Codes: F21V 25/04 breaking the electric circuit
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: H01R 33/96 with switch operated by engagement or disengagement of coupling

Abstract

A rod-shaped retrofit lamp may have a mechanical sensing unit, and a current path has a plurality of electrically conductive sub-segments of which a first sub-segment is connected to the associated pin and of which a sub-segment is connected to the lamp'"'"'s electronics unit, wherein the mechanical sensing unit is elastically pushed in counter to its projection direction from a released condition into an engaged condition and interacting with two current paths in such a way that the respective current path'"'"'s first and second sub-segment will have been galvanically mutually coupled when the sensing unit is in the engaged condition so that the respective current path will have been closed and associated pin thereby electrically connected to the internal electronics unit.

Claims

1. A rod-shaped retrofit lamp for replacing a fluorescent lamp, having an end face from which two pins project, with the two pins being connected to an internal electronics unit located in the lamp via a respective current path extending between the respective pin and the lamp'"'"'s electronics unit,

wherein the retrofit lamp furthermore has a mechanical sensing unit, and the respective current path has a plurality of electrically conductive sub-segments of which a first sub-segment is electrically connected to the associated pin and of which a second sub-segment is electrically connected to the lamp'"'"'s electronics unit,

wherein the mechanical sensing unit is capable of being elastically pushed in counter to its projection direction from a released condition into an engaged condition and interacting with the two current paths in such a way that

the respective current path'"'"'s first and second sub-segment will have been galvanically mutually coupled when the sensing unit is in the engaged condition so that the respective current path will have been closed and the associated pin thereby electrically connected to the internal electronics unit,

whereas when the sensing unit is in the released condition the respective current path'"'"'s first sub-segment will have been galvanically decoupled from the respective current path'"'"'s second sub-segment so that the respective current path will have been interrupted and the associated pin thereby galvanically decoupled from the lamp'"'"'s electronics unit,

wherein the sensing unit for galvanically separating the two pins and hence for protecting users from shock hazards is taken from its released to its engaged condition in order to couple the lamp'"'"'s internal electronics unit to the supply voltage only when the retrofit lamp has been completely fitted into a luminaire.

2. The lamp as claimed in claim 1,

having a second end face which correspondingly to the one end face is furnished with two pins and a mechanical sensing unit.

3. The lamp as claimed in claim 1,

wherein the respective sensing unit is located partially or completely in the circumferential region of the respective end face.

4. The lamp as claimed in claim 1,

wherein the respective sensing unit pushes in its engaged condition against an elastically bendable electrically conductive sub-segment of the current path.

5. The lamp as claimed in claim 1,

wherein the respective sensing unit has a plurality of sensing segments which project from the respective end face and can each be elastically pushed in counter to their projection direction from a released condition into an engaged condition, with the sensing segments interacting with the two current paths in such a way that

the respective current path'"'"'s first and second sub-segment will have been galvanically mutually coupled when all the sensing segments are simultaneously in the engaged condition,

wherein the respective current path'"'"'s first sub-segment has been galvanically decoupled from the respective current path'"'"'s second sub-segment if at least one of the sensing segments is in the released condition.

6. The lamp as claimed in claim 5,

wherein the respective sensing unit has at least three sensing segments that are distributed among three 120°

front face sectors or at least or precisely four sensing segments that are distributed among four 90°

front face sectors.

7. The lamp as claimed in claim 5,

wherein the respective current path is formed by a plurality of electrically conductive sub-segments arranged one behind the other,

wherein mutually adjacent sub-segments overlap in a spaced-apart manner when the sensing segments are in the released condition, and

wherein the sub-segments in the overlapping regions have in the spacing direction been brought into electric contact by the pushed-down sensing segments when the sensing segments are in the engaged position.

8. The lamp as claimed in claim 7,

wherein the respective current path'"'"'s electrically conductive sub-segments are embodied as strips,

wherein a plurality of pairs of strips each consist of a top electrically conductive strip and a bottom electrically conductive strip being arranged one behind the other,

wherein the top strips of mutually adjacent pairs of strips overlap in a spaced-apart manner with a top current path being formed, and

wherein the bottom strips of mutually adjacent pairs of strips overlap in a spaced-apart manner with a bottom current path being formed.

9. The lamp as claimed in claim 7,

wherein the respective current path has a plurality of ring arcs arranged one behind the other,

wherein mutually adjacent ring arcs of the respective current path overlap in a spaced-apart manner and each being bent upward in the overlapping region.

10. The lamp as claimed in claim 7,

wherein the respective current path has a plurality of ring arcs that are arranged one behind the other in a spaced-apart manner and which will have been connected in series via electrically conductive sub-segments attached to the sensing segments when the sensing segments are in the engaged condition.

11. The lamp as claimed in claim 1,

wherein the galvanic coupling of the respective current path'"'"'s first and second electrically conductive sub-segment is achieved either directly through the sensing unit'"'"'s being pushed in or by means of a relative rotational movement between the mechanical sensing unit and the electrically conductive sub-segments following the push-in action.

12. The lamp as claimed in claim 5,

wherein the galvanic coupling of the respective current path'"'"'s first and second electrically conductive sub-segment is achieved either directly through the sensing unit'"'"'s being pushed in or by means of a relative rotational movement between the mechanical sensing unit and the electrically conductive sub-segments following the push-in action,

wherein each of the sensing segments blocks the relative rotational movement in its released condition and enables it in its engaged condition so that the sensing segments first all have to be pushed down for the respective current path'"'"'s first and second sub-segment to be galvanically coupled by means of the relative rotational movement.

13. An end cap for a lamp rod-shaped retrofit lamp for replacing a fluorescent lamp,

having an end face from which two pins project,

with the two pins being connected to an internal electronics unit located in the lamp via a respective current path extending between the respective pin and the lamp'"'"'s electronics unit,

wherein the retrofit lamp furthermore has a mechanical sensing unit,

and the respective current path has a plurality of electrically conductive sub-segments of which a first sub-segment is electrically connected to the associated pin and of which a second sub-segment is electrically connected to the lamp'"'"'s electronics unit,

wherein the mechanical sensing unit is capable of being elastically pushed in counter to its projection direction from a released condition into an engaged condition and interacting with the two current paths in such a way that

the respective current path'"'"'s first and second sub-segment will have been galvanically mutually coupled when the sensing unit is in the engaged condition so that the respective current path will have been closed and the associated pin thereby electrically connected to the internal electronics unit,

whereas when the sensing unit is in the released condition the respective current path'"'"'s first sub-segment will have been galvanically decoupled from the respective current path'"'"'s second sub-segment so that the respective current path will have been interrupted and the associated pin thereby galvanically decoupled from the lamp'"'"'s electronics unit,

wherein the sensing unit for galvanically separating the two pins and hence for protecting users from shock hazards is taken from its released to its engaged condition in order to couple the lamp'"'"'s internal electronics unit to the supply voltage only when the retrofit lamp has been completely fitted into a luminaire,

the end cap having an end face from which the two pins and the mechanical sensing unit project, and two current paths each consisting of a plurality of electrically conductive sub-segments for respectively connecting the pins to the lamp'"'"'s electronics unit, with the mechanical sensing unit being capable of being elastically pushed in counter to its projection direction from a released condition into an engaged condition and interacting with the two current paths in such a way that the respective current path'"'"'s first and second sub-segment will have been galvanically mutually coupled when the sensing unit is in the engaged condition whereas when the sensing unit is in the released condition the respective current path'"'"'s first sub-segment will have been galvanically decoupled from the respective current path'"'"'s second sub-segment.