EP0193294A2
Expired / Lapsed
EP
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Vehicle lamp assembly
Assignee: Koito Europe Ltd
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Filing: 1986-02-05
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Granted: —
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Expires: 2006-02-05
Abstract
Abstract A vehicle lamp assembly comprises a light source ( 1 6), a light transmitting outer element (24) and a cylindrical light transmitting intermediate element (18) disposed between the light source (16) and the outer element (24) with the light source (16) on its cylinder axis. The intermediate element - (18) has elongate Fresnel prism formations (22) of uniform cross section on its outer surface which extend in respective planes perpendicular to the cylinder axis so as to collimate light from the light source (16) into said planes. A second set of elongate Fresnel prism formations (26, 28), formed on the outer element (24), is oriented parallel to the cylinder axis of the intermediate element (18).
Inventors
- 👤 Nicholas William Tysoe
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 19:58
CPC Classifications
F; F21; F21S; F21S43/00; F21S43/20; F21S43/255
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
139 words
A vehicle lamp assembly comprising a light source (16), a light transmitting outer element (24) and a cylindrical light transmitting intermediate element (18) disposed between the light source (16) and the outer element (24) with the light source ( 1 6) on its cylinder axis and having elongate Fresnel prism formations (22) of uniform cross section on one surface extending in respective planes perpendicular to the cylinder axis and arranged to collimate light from the light source (16) into said planes, characterised in that said elongate Fresnel prism formations (22) are disposed on the outer surface of the intermediate element (18) and a second set of elongate Fresnel prism formations (26, 28) is formed on the outer element (24), said second set of prism formations (26, 28) being oriented parallel to the cylinder axis of the intermediate element (18).
Claim 2
Dependent Claim
139 words
A vehicle lamp assembly comprising a light source (16), a light transmitting outer element (24) and a cylindrical light transmitting intermediate element (18) disposed between the light source (16) and the outer element (24) with the light source ( 1 6) on its cylinder axis and having elongate Fresnel prism formations (22) of uniform cross section on one surface extending in respective planes perpendicular to the cylinder axis and arranged to collimate light from the light source (16) into said planes, characterised in that said elongate Fresnel prism formations (22) are disposed on the outer surface of the intermediate element (18) and a second set of elongate Fresnel prism formations (26, 28) is formed on the outer element (24), said second set of prism formations (26, 28) being oriented parallel to the cylinder axis of the intermediate element (18).
Claim 3
Dependent Claim
39 words
A vehicle lamp assembly according to claim 1, wherein the outer element (24) is integral with the cover element of the lamp assembly and the second set of prism formations - (26, 28) are disposed on its inner surface.
Claim 4
Dependent Claim
43 words
A vehicle lamp assembly according to claim 1, having a cover element (12) outside the outer element (24) and some of the prism formations (26) of the second set are on the outer surface and others (28) are on the inner surface thereof.
Claim 5
Dependent Claim
76 words
A vehicle lamp assembly according to claim 3, wherein the outer element (24) comprises first and second plane portions, the first portion being perpendicular to the direction of the emergent light beam therefrom and having some of the the prism formations (26) of the second set on its outer surface, and the second portion being inclined to the first portion and having others of the prism formations (28) of the second set on its inner surface.
Claim 6
Dependent Claim
61 words
A vehicle lamp assembly according to any preceding claim, wherein the lamp assembly is of the type in which the perceived colour when the light source (16) is illuminated is different from that when the light source (16) is not illuminated, the intermediate element (18) is moulded from material having the colour required to be perceived when the lamp is on.
References Cited (Backward Citations)
No citation records indexed.
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