Illumination system with inclined light source
AssigneeKoninklijke Philips N.V.
InventorsPetrus Adrianus Josephus Holten, Vincent Fabriek, Giorgia Tordini
Life of this patent
Estimating the term…
Abstract
The illumination system includes a light source, a diffusing element and a specular back reflector. The light source is configured to emit light towards the specular back reflector reflecting at least part of the light emitted by the light source so as to illuminate the diffusing element. The specular back reflector is shaped to generate a substantially homogeneous distribution across the diffusing element of a light flux impinging on the diffusing element.
Claims13
An illumination system comprising a light source, a diffusing element and a specular back reflector, the light source being configured to emit light towards the specular back reflector reflecting at least part of the light emitted by the light source so as to illuminate the diffusing element, a shape of the specular back reflector generating a substantially homogeneous distribution across the diffusing element of a light flux impinging on the diffusing element, wherein the diffusing element comprises a first edge near the light source and a second edge away from the light source, the first edge and the second edge defining an imaginary planar surface having a normal axis, an axis of symmetry of the light source defining a further angle (β) to the normal axis, the further angle (β) being within a range of plus or minus 30°.
An illumination system, comprising:
- a light source defining an axis of symmetry,
- a diffusing element including a first edge near the light source and a second edge away from the light source, the first edge and the second edge defining an imaginary planar surface having a normal axis, the axis of symmetry of the light source defining an angle β to the normal axis, the angle β being within a range of about plus or minus 30 degrees;
- and
- a specular back reflector;
- wherein the light source is configured to emit light towards the specular back reflector to reflect at least part of the light emitted by the light source on as to illuminate the diffusing element, a shape of the specular back reflector generating a substantially homogeneous distribution of a light flux impinging across the diffusing element;
- wherein the diffusing element includes a structured surface for preventing reflection of the impinging light from the diffusing element back towards the specular back reflector.
An illumination system, comprising:
- a light source defining an axis of symmetry;
- a diffusing element including a first edge near the light source and a second edge away from the light source, the first edge and the second edge defining an imaginary planar surface having a normal axis, the axis of symmetry of the light source defining an angle β to the normal axis, the angle β being within a range of about plus or minus 30 degrees;
- a specular back reflector;
- wherein the light source is configured to emit light towards the specular back reflector to reflect at least part of the light emitted by the light source to illuminate the diffusing element, a shape of the specular back reflector generating a substantially homogeneous distribution of a light flux impinging across the diffusing element;
- and,
- wherein the specular back reflector is partially transmissive to part of the impinging light.
An illumination system, comprising:
- a light source defining an axis of symmetry,
- a diffusing element including a first edge near the light source and a second edge away from the light source, the first edge and the second edge defining an imaginary planar surface having a normal axis, the axis of symmetry of the light source defining an angle β to the normal axis, the angle β being within a range of about plus or minus 30 degrees;
- a specular back reflector;
- wherein the light source is configured to emit light towards the specular back reflector to reflect at least part of the light emitted by the light source to illuminate the diffusing element, a shape of the specular back reflector generating a substantially homogeneous distribution of a light flux impinging across the diffusing element;
- and
- wherein the diffusing element comprises a luminescent material for converting at least part of the light emitted by the light source into light having a different color.
Dependencies are inferred from the claim text.