Patent EP0084934A1 successfully refreshed from Google Patents.
EP0084934A1
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EP
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Lamp reflector
Assignee: ZF International UK Ltd
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Filing: 1983-01-10
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Granted: —
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Expires: 2003-01-10
Abstract
Abstract To provide an increase horizontal spread of light compared with a paraboloidal reflector, the lamp reflector comprises a dished body (10) having an internal reflective surface defined at least partly by a series of troughs (1 5) whose surfaces are generated by movement of a parabola so that the tangent at the apex thereof moves parallel to itself along a polygonal line whose sides are tangents to a parabola which has the same focal length as that of the first-mentioned parabola and which is perpendicular to the latter. In an alternative embodiment, only one such trough is provided between a pair of paraboloidal reflective portions each of which has its focus coincident with the second-mentioned parabola.
Inventors
- 👤 Kenneth James Jones
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 09:36
CPC Classifications
F; F21; F21S; F21S41/00; F21S41/30; F21S41/32; F21S41/33; F21S41/334; F21S41/336
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
106 words
A lamp reflector comprising a dished body (10, 110, 210, 310) having an internal reflective surface, said internal reflective surface including at least one surface portion formed of a plurality of side-by-side troughs (15, 118 or 119, 218 or 219, 318) characterized in that the surfaces of said troughs (15, 118 or 119, 218 or 219, 318) are generated by movement of a parabola so that the tangent at the apex thereof moves parallel to itself along a polygonal line whose sides are tangents to a parabola which has the same focal length as that of the first-mentioned parabola and which is perpendicular to the latter.
Claim 2
Dependent Claim
106 words
A lamp reflector comprising a dished body (10, 110, 210, 310) having an internal reflective surface, said internal reflective surface including at least one surface portion formed of a plurality of side-by-side troughs (15, 118 or 119, 218 or 219, 318) characterized in that the surfaces of said troughs (15, 118 or 119, 218 or 219, 318) are generated by movement of a parabola so that the tangent at the apex thereof moves parallel to itself along a polygonal line whose sides are tangents to a parabola which has the same focal length as that of the first-mentioned parabola and which is perpendicular to the latter.
Claim 3
Dependent Claim
30 words
A lamp relfector as claimed in claim 1, wherein substantially the whole of the reflective surface of the reflector is defined by one of said at least one surface portion.
Claim 4
Dependent Claim
18 words
A lamp reflector as claimed in claim 1, wherein more than one of said surface portions is provided.
Claim 5
Dependent Claim
48 words
A lamp reflector as claimed in claim 3, including a first and second of said surface portions being disposed above the second and being displaced therefrom so that the focus of the second surface portion is spaced forwardly of the focus of the first internal reflective surface portion.
Claim 6
Dependent Claim
26 words
A lamp reflector as claimed in any preceding claim, including at least one paraboloidal surface portion having its focus coincident with that of the second-mentioned parabola.
Claim 7
Dependent Claim
102 words
A lamp reflector comprising a dished body (410) having an internal reflective surface, said reflective surface including a pair of paraboloidal portions (430), characterised in that the paraboloidal portions (430) are separated by a trough (418), the trough being defined by a surface generated by movement of a parabola so that the tangent at the apex thereof moves parallel to itself along a line which is a tangent to a parabola which has the same focal length as that of the first-mentioned parabola and which is perpendicular to the latter each paraboloidal portion (430) having its focus coincident with the second-mentioned parabola.
Claim 8
Dependent Claim
102 words
A lamp reflector comprising a dished body (410) having an internal reflective surface, said reflective surface including a pair of paraboloidal portions (430), characterised in that the paraboloidal portions (430) are separated by a trough (418), the trough being defined by a surface generated by movement of a parabola so that the tangent at the apex thereof moves parallel to itself along a line which is a tangent to a parabola which has the same focal length as that of the first-mentioned parabola and which is perpendicular to the latter each paraboloidal portion (430) having its focus coincident with the second-mentioned parabola.
Claim 9
Dependent Claim
48 words
A lamp reflector as claimed in claim 6, having upper and lower sets of said paraboloidal portions and trough, the sets being displaced so that the focus of the paraboloidal portions of the lower set is disposed forwardly of that of the paraboloidal portions of the upper set.
References Cited (Backward Citations)
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