Lamp and headlighting arrangement for obtaining a color appearance in an automotive headlight

Patent metadata

Field	Value
Publication number	US-2016148798-A1
Application number	US-201414901660-A
Country	US
Kind code	A1
Filing date	Jun 26, 2014
Priority date	Jun 27, 2013
Publication date	May 26, 2016
Grant date	—

Abstract

A lamp 10 is described which may be used in an automotive headlight 12. The lamp 10 comprises at least one filament 20 within a transparent lamp vessel 16. A color filter portion 30 is provided through which light is emitted with a color change. The lamp vessel 16 further comprises a color transparent portion, through which light is emitted without a color change. The color transparent portion is arranged such that an illumination beam of light 40 is emitted through the color transparent portion to achieve a non-colored illumination. The color filter portion 30 is arranged such that only peripheral and/or scattered portions of light are emitted through the color filter portion to achieve a color appearance of the headlight 12 in operation of the lamp 10.

First claim

1 . Lamp suitable for use in an automotive headlight, comprising:
at least one filament arranged within a transparent lamp vessel, the lamp vessel being bounded at one axial end by a top end and at another axial end by a lower end portion, where said lamp vessel comprises a color filter portion through which light is emitted with a color change, and a color transparent portion, through which light is emitted without a color change, where said color transparent portion is arranged such that an illumination beam of light is emitted from said filament through said color transparent portion to achieve a non-colored illumination,
wherein
said color transparent portion, at least for part of the circumference of the lamp vessel, extends between the top end and the lower end portion, and
said color filter portion is arranged such that a peripheral and/or a
scattered portion of light from said filament is emitted through said color filter portion to achieve a color appearance.

2 . Lamp according to claim 1 , wherein:
the top end of the vessel is covered by an opaque top cover, wherein a surface of said top cover is of a color corresponding to the color of the light emitted through said color filter portion.

3 . Lamp according to claim 1 , wherein:
at least one shield is arranged adjacent to said filament to partly block light emitted from said filament into radial directions within an angular shielded region, and where at least a part of said color filter portion is arranged within said angular shielded region.

4 . Lamp according to claim 3 , wherein:
said color filter portion covers, in a central plane, an angular region that is at least as wide as the angular shielded region.

5 . Lamp according to claim 4 , wherein:
said color filter portion has an angular width which is 120-160% of the width of the angular shielded region.

6 . Lamp according to claim 3 , wherein:
said color filter portion has a longitudinal extension along a longitudinal axis L of said lamp which is 50-200% of the longitudinal extension of said shield.

7 . Lamp according to claim 3 , wherein:
said color filter portion is arranged non-symmetrically relative to said shield.

8 . Lamp according to claim 1 , wherein:
said illumination beam of light emitted in vertical directions forming angles of at least +/−30° with a central plane (A) in which a center of the filament is arranged, which central plane (A) is oriented perpendicular to a longitudinal axis (L) of the lamp.

9 . Lamp according to claim 1 , wherein:
said illumination beam of light is emitted in radial directions in a plane (A) oriented perpendicular to a longitudinal axis (L) of said lamp over an angular range of at least 120°.

10 . Lamp according to claim 1 , wherein:
a second filament is arranged within said lamp vessel for emitting a high-beam illumination beam of light into all radial directions through said color transparent.

11 . Lamp according claim 1 , wherein:
said color filter portion comprises a color filter coating provided on said lamp vessel.

12 . Headlighting arrangement for a motor vehicle, comprising:
a lamp according to claim 1 , and a reflector, where said reflector reflects said illumination beam of said lamp to form a non-colored illumination beam pattern projected along an optical axis (O), and where said scattered and/or peripheral portions of light are reflected in said reflector into peripheral directions to achieve a color appearance.

Assignees

• Koninkl Philips Nv

Inventors

• Kowalski Jacek Maciej
• Plawski Miktor
• Mamenas Tomasz Michal
• Kozar Piotr Jerzy
• Marek Mateusz Wojciech
• Kuepper Lukas
• Dohmen Hans-Alo
• Zydorczyk Anna Justyna

Classifications

• H01K1/26 Primary

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

• F21S41/125

  Coloured light · CPC title

• F21S41/435

  Hoods or cap-shaped · CPC title

• H01K9/08

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

• F21S41/60

  characterised by a variable light distribution · CPC title