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US 8,475,008 B2Granted
Integrated sleeve and cap unit optically screens light source and intercepts light rays in a lighting unit with a reflector
AssigneeKoninklijke Philips Electronics N.V.
InventorRalph Hubert Peters
Life of this patent
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Abstract
The invention relates to a lighting unit (1) having a concave reflector (2) with an axis of symmetry (3) and a light emission window 21) bounded by a circumferential edge (20) transverse to the axis, an elongate light source (30) extending substantially along the axis of symmetry (3), which light source (30) is accommodated in a holder (4) opposite the light emission window (21), and an axially positioned cap (5), which cap partly surrounds the light source (30) and forms an optical screening means to intercept unreflected light rays. According to the invention, the cap (5) forms part of a sleeve (60) surrounding the light source (30).
Claims12
A lighting unit comprising
- a concave reflector having an axis of symmetry
- a light emission window bounded by an edge of the reflector which surrounds the axis transversely thereto,
- an elongate light source which is axially arranged substantially on the axis of symmetry and which is accommodated in a holder opposite the light emission window, and
- an axially positioned cap serving as an optical screening means that partly surrounds the light source for intercepting unreflected light rays, the cap forming part of a sleeve surrounding the light source.
- characterized in that the cap is surrounded at a distance d by a screening ring which is impermeable to light and which extends over a height h in the direction of the light emission window.
2 more elements
A lighting unit comprising
- a concave reflector defining an axis of symmetry and having an edge surrounding the axis, the edge being adapted to accommodate a light emission window at a position traverse to the axis;
- an elongate light source arranged substantially along the axis;
- an integral sleeve and cap unit formed into from a single piece of material and surrounding the light source, a cap portion of the sleeve and cap unit being at an end facing the position, the cap portion being adapted to act as an optical screening means that partly surrounds the light source and intercepts unreflected light rays, wherein the single piece of material also forms a screening ring around the axis, the screening ring enhancing the screening properties of the sleeve and cap unit.
A lighting unit comprising
- a concave reflector defining an axis of symmetry and having an edge surrounding the axis, the edge being adapted to accommodate a light emission window at a position traverse to the axis;
- an elongate light source arranged substantially along the axis;
- wherein
- an integral sleeve and cap unit formed into from a single piece of material and surrounding the light source, a cap portion of the sleeve and cap unit being at an end facing the position, the cap portion being adapted to act as an optical screening means that partly surrounds the light source and intercepts unreflected light rays;
- the single piece of material also forms a screening ring around the axis, the screening ring enhancing the screening properties of the sleeve and cap unit;
- the screening ring includes a boundary closer to the axis and an edge more distant from the axis, and
- a sleeve portion of the sleeve and cap unit extends from an edge of the screening ring which is more distant from the axis.
4 more elements
A lighting unit comprising
- a concave reflector defining an axis of symmetry and having an edge surrounding the axis, the edge being adapted to accommodate a light emission window at a position traverse to the axis;
- an elongate light source arranged substantially along the axis;
- an integral sleeve and cap unit formed into from a single piece of material and surrounding the light source, a cap portion of the sleeve and cap unit being at an end facing the position, the cap portion being adapted to act as an optical screening means that partly surrounds the light source and intercepts unreflected light rays,
- wherein the sleeve and cap unit comprises an integrally formed conical ring surface with a maximum apex angle of 10°, the apex angle being at the side of the position, a conical ring surface on the sleeve and cap unit defining a screening ring for forming a converging beam.
1 more element
A method for manufacturing a lighting unit comprising
- integrally forming a sleeve and cap unit from a single piece of material, the cap portion of the sleeve and cap unit being for optically screening light rays and intercepting unreflected light rays;
- assembling the sleeve and cap unit together with a reflector and light source, the reflector defining an axis of symmetry and having an edge adapted to hold a light emission window at a position traverse to the axis, the assembling being such that the light source is substantially along the axis and the sleeve and cap unit is around the light source with the cap facing the position, and
- forming a screening ring portion of the sleeve and cap unit from the same single piece of material, the screening ring also having optical screening and reflecting properties.
Dependencies are inferred from the claim text.