Automotive front lighting lamp with baffle

Patent metadata

Field	Value
Publication number	US-9613793-B2
Application number	US-201414889600-A
Country	US
Kind code	B2
Filing date	May 6, 2014
Priority date	May 7, 2013
Publication date	Apr 4, 2017
Grant date	Apr 4, 2017

Abstract

A lamp for automotive vehicle front lighting is described. The lamp 10 comprises a base 12 for mechanical and electrical connection to an automotive headlight 50 and a burner 14 fixed to the base 12 . The burner 14 comprises an enclosed transparent vessel 22 . A first and a second filament 34, 36 are arranged within the vessel 22 . A baffle 40 is arranged proximate to the first filament 34 to shield the second filament 36 from the first filament 34 . The baffle 40 is of concave shape and includes a bottom surface 41 and side surfaces 45 terminating in side edges 48 . The baffle 40 further includes a front surface 43 arranged between the first and second filaments 34, 36 to shield the second filament 36 from light emitted from the first filament 34 . The side edges 48 each comprise a central portion 54 extending, in side view, straight and in parallel to the longitudinal axis X. The straight central portions 54 have an axial length of at least 3.5 mm. An edge height H E is defined as a distance between the bottom surface 41 and the plane defined between the central portions 54 of the side edges 48 . The edge height is more than 2.8 mm.

First claim

The invention claimed is:

1. Lamp for automotive vehicle front lighting, comprising
a base for mechanical and electrical connection to an automotive headlight, said base having a longitudinal axis,
a burner fixed to said base, said burner comprising an enclosed transparent vessel,
at least a first and a second filament arranged within said vessel,
and a baffle arranged proximate to said first filament to partially shield light emitted from said first filament,
wherein said baffle is of concave shape and includes at least a bottom surface and side surfaces, said side surfaces terminating in side edges,
and wherein said baffle further includes a front surface arranged at an axial front end of said baffle, the axial front end being the axial end of said baffle closest to the second filament, where at least a part of said front surface is arranged between said first and second filaments to shield said second filament from light emitted from said first filament,
wherein the front surface extends higher than the side edges of the baffle,
and wherein the front surface and the side edges form a sloping transition,
wherein said side edges each comprise a central portion extending, in a side view, at least straight and in parallel to said longitudinal axis, said straight central portions starting, in a side view, at a distance (a) along said longitudinal axis from said front end of no more than 2.8 mm,
and wherein an edge height is defined as a distance between said bottom surface and a plane defined between said straight central portions of said side edges, where said edge height is more than 2.8 mm.

2. Lamp according to claim 1 , where
said straight central portions of said side edges start, in side view, at a distance parallel to said longitudinal axis within an axial range of 1.4-2.8 mm from said front end of said baffle.

3. Lamp according to claim 2 , where
said straight central portions start within an axial range of 1.7-2.5 mm from said first end.

4. Lamp according to claim 1 , where
said straight central portions extend, in side view, straight and in parallel to said longitudinal axis over an axial length of at least 3.5 mm.

5. Lamp according to claim 1 , where
said baffle comprises, at a back end located opposite to said front end, a flat attachment member oriented in parallel to said bottom surface,
where said attachment member is arranged in a plane distant from a plane of said bottom surface by an attachment member height,
where said attachment member height is less than said edge height.

6. Lamp according to claim 1 , where
said front surface extends up to a front height defined as a distance from said bottom surface,
where said front height is more than 3.5 mm.

7. Lamp according to claim 1 , where
said first filament is provided as a winding structure around a first filament axis which is oriented in parallel to said longitudinal axis,
where a first filament distance is defined as a distance between an upper edge of said first filament and said plane defined by said straight central portions of said side edges,
where said first filament distance is less than 0.75 mm.

8. Lamp according to claim 1 , where
said first filament extends over a first axial filament length parallel to said longitudinal axis,
where said straight central portions of said side edges are arranged over at least 70% of said first axial filament length.

9. Lamp according to claim 1 , where
said second filament is provided as a winding structure around a second filament axis which is oriented in parallel to said longitudinal axis,
where a second filament height is defined as a distance between said second filament axis and said plane of said bottom surface of said baffle,
where said second filament height is less than said edge height.

10. Lamp according to claim 1 , where
said base comprises a reference protrusion defining a radial reference direction,
where said filaments and said baffle are symmetrical to a symmetry plane defined by said longitudinal axis and said radial reference direction.

11. Vehicle headlight comprising
a reflector,
and a lamp according to claim 1 .

Assignees

• Koninklijke Philips Nv

Inventors

• Schoenfelder Bernd
• Moeller Johannes Gerhard

Classifications

• H01K1/26 Primary

  Screens; Filters (associated with envelope H01K1/28) · CPC title

• H01K9/08

  to provide selectively different light effects, e.g. for automobile headlamp · CPC title

• F21S48/1172

  Mechanical Engineering · mapped topic

• F21S41/164

  having two or more filaments · CPC title