Lighting apparatus

• US 9,256,021 B2
• Filed: 06/22/2009
• Issued: 02/09/2016
• Est. Priority Date: 06/27/2008
• Status: Expired due to Fees

• Current Assignee: Philips Lighting Holding BV (Signify N.V.)
• Original Assignee: Koninklijke Philips N.V.
• Inventors: Hikmet, Rifat Ata Mustafa
• Primary Examiner(s): Mai, Anh
• Assistant Examiner(s): APENTENG, JESSICA MCMILLAN
• Application Number:
  US12/996,674
• Publication Number:
  US 20110085319A1
• Time in Patent Office: 2,423 Days
• Field of Search: 362/259, 362/84, 362/551, 362/553, 362/554, 362/556
• US Class Current: 1/1
• CPC Class Codes: B32B 17/10 of synthetic resin
• CPC Class Codes: G02B 6/0041 provided in the bulk of the light guide
• CPC Class Codes: G02B 6/0043 provided on the surface of the light guide
• CPC Class Codes: G02B 6/0073 Light emitting diode [LED]

Abstract

A lighting apparatus includes a laser light modification unit for modifying laser light from a laser to form a modified light. The lighting apparatus further includes a first layer and an opposing second layer, where the laser light modification unit is between the first and second layers. One of these two layers includes a transparent material being transparent to the modified light. The laser light modification unit is configured to allow the modified light to pass through the transparent material.

Claims

1. A lighting apparatus comprising:

laser light modification units configured to modify laser light to modified light, wherein a first laser light modification unit of the laser light modification units comprises a first luminescent material for emitting a first luminescent light and a second laser light modification unit of the laser light modification units comprises a second luminescent material for emitting a second luminescent light, the first luminescent light and the second luminescent light being the modified light when illuminated by the laser light;

a laser for emitting the laser light that is to be directed along a longitudinal axis of the lighting apparatus to the first and second luminescent material of the laser light modification units;

a first layer and an opposing second layer; and

an intermediate transparent layer disposed between the first layer and the second layer,

wherein the laser light modification units are arranged between the first layer and the second layer,

wherein at least one of the first layer and the second layer comprises a transparent material being transparent to the modified light,

wherein the laser light modification units are configured to allow the modified light to pass through the transparent material, said laser light modification units being arranged at different locations between the first layer and the second layer,

wherein only the first luminescent material and the second luminescent material protrude in a transverse direction transverse to the laser light and to the longitudinal axis of the lighting apparatus, and wherein a first protruding length of the first luminescent material is different from a second protruding length of the second luminescent material, the first protruding length and the second protruding length being a length of protrusion into the laser light along the transverse direction of the laser light, and

wherein the laser and the first and second luminescent material of the laser light modification units are arranged such that the laser light modification units are simultaneously illuminatable by the laser light, and

wherein the intermediate transparent layer comprises one of gas and liquid.

2. The lighting apparatus of claim 1, wherein the first and second luminescent material are different so that said laser light modification units modify the laser light differently.

3. The lighting apparatus of claim 1, wherein the first layer, the second layer and the intermediate transparent layer disposed between the first layer and the second layer form a laminate, wherein the laser light modification units are arranged in the intermediate transparent layer, and wherein the intermediate transparent layer is transparent to the laser light.

4. The lighting apparatus of claim 1, further comprising a waveguide for guiding the laser light to the laser light modification units.

5. The lighting apparatus of claim 4, wherein the first layer, the second layer and the intermediate transparent layer between the first layer and the second layer form a laminate, wherein the waveguide is arranged in the intermediate transparent layer.

6. The lighting apparatus of claim 5, wherein the waveguide is a waveguide without a cladding, and wherein a refractive index of the intermediate transparent layer is chosen such that waveguiding is enabled within the waveguide.

7. The lighting apparatus of claim 4, wherein the waveguide comprises a cladding, wherein the cladding comprises at least two openings for forming the laser light modification units for allowing the laser light to leave the waveguide and pass through the transparent material of least one of the first layer and the second layer.

8. The lighting apparatus of claim 4, wherein the waveguide comprises a cladding, where the cladding comprises at least two openings, wherein the first and second luminescent material are located at the at least two openings respectively, and the at least two openings and the first and second luminescent material form the laser light modification units, wherein the at least two openings and the first and second luminescent material are configured such that the modified light passes through the transparent material of at least one of the first layer and the second layer.

9. The lighting apparatus of claim 4, further comprising a crack detection unit for detecting a crack in at least one of the first layer and the second layer, and a control unit for controlling the laser, wherein the control unit is configured to switch the laser off if the crack detection unit has detected a crack in at least one of the first layer and the second layer, wherein the crack detection unit comprises an electrically conducting layer placed on one of the first layer and the second layer, and wherein the crack detection unit further comprises a circuit measuring a resistance of the conducting element.

10. The lighting apparatus of claim 4, wherein the waveguide comprises an optical fiber and the first luminescent material and the second luminescent material are placed on the optical fiber.

11. A method of producing a lighting apparatus comprising the acts of:

providing at least two laser light modification units for modifying laser light to modified light, a laser for emitting the laser light that is to be directed along a longitudinal axis of the lighting apparatus to luminescent material of the at least two laser light modification units, a first layer and an opposing second layer, and an intermediate transparent layer disposed between the first layer and the second layer, wherein a first laser light modification unit of the at least two laser light modification units comprises a first luminescent material for emitting a first luminescent light and a second laser light modification unit of the at least two laser light modification units comprises a second luminescent material for emitting a second luminescent light, the first luminescent light and the second luminescent light being the modified light when illuminated by the laser light, wherein at least one of the first layer and the second layer comprises a transparent material being transparent to the modified light, wherein the at least two laser light modification units are configured to allow the modified light to pass through the transparent material, wherein only the first luminescent material and the second luminescent material protrude in a transverse direction transverse to the laser light and to the longitudinal axis, and wherein a first protruding length of the first luminescent material is different from a second protruding length of the second luminescent material, wherein the first length and the second protruding length are a length of protrusion into the laser light along the transverse direction of the laser light; and

arranging the first and second luminescent material of the at least two laser light modification units, the laser, the first layer and the second layer such that the laser light modification units are arranged between the first layer and the second layer, such that the at least two laser light modification units are simultaneously illuminatable by the laser light and the laser light is directable to the at least two laser light modification units for generating the modified light, and that the modified light is allowed to pass through the transparent material, wherein the intermediate transparent layer comprises one of gas and liquid.

12. The method of claim 11, further comprising the acts of:

detecting a crack in at least one of the first layer and the second layer by a crack detection unit; and

controlling the laser to switch the laser off if the crack detection unit has detected a crack in at least one of the first layer and the second layer,

wherein the crack detection unit comprises an electrically conducting layer placed on one of the first layer and the second layer, and wherein the detecting act measures a resistance of the conducting element.

13. A lighting apparatus comprising:

laser light modification units configured to modify laser light to modified light, wherein a first laser light modification unit of the laser light modification units comprises a first luminescent material for emitting a first luminescent light and a second laser light modification unit of the laser light modification units comprises a second luminescent material for emitting a second luminescent light, the first luminescent light and the second luminescent light being the modified light when illuminated by the laser light;

a laser for emitting the laser light that is to be directed along a longitudinal axis of the lighting apparatus to the first and second luminescent material of the laser light modification units;

a first layer and an opposing second layer;

an intermediate transparent layer disposed between the first layer and the second layer to form a laminate; and

a waveguide arranged in the intermediate transparent layer,

wherein the waveguide comprises a cladding and an optical fiber, and the first luminescent material and the second luminescent material are placed on the optical fiber, and

wherein the cladding comprises openings for forming the laser light modification units for allowing the laser light to leave the waveguide and pass through a transparent material of least one of the first layer and the second layer.

14. The lighting apparatus of claim 13, wherein the first luminescent material and the second luminescent material are placed on a surface of one of the first layer and the second layer.

15. The lighting apparatus of claim 13, wherein the transparent material is transparent to the modified light, and wherein the intermediate transparent layer comprises one of gas and liquid.

16. A lighting apparatus comprising:

laser light modification units configured to modify laser light to modified light, wherein a first laser light modification unit of the laser light modification units comprises a first luminescent material for emitting a first luminescent light and a second laser light modification unit of the laser light modification units comprises a second luminescent material for emitting a second luminescent light, the first luminescent light and the second luminescent light being the modified light when illuminated by the laser light;

a laser for emitting the laser light that is to be directed along a longitudinal axis of the lighting apparatus to the first and second luminescent material of the laser light modification units;

a first layer and an opposing second layer;

an intermediate transparent layer disposed between the first layer and the second layer to form a laminate;

a waveguide arranged in the intermediate transparent layer;

a further waveguide;

beam splitting elements configured to divide the laser light of the laser into two laser beams for illuminating a first group of the laser light modification units of the waveguide and a second group of the laser light modification units of the further waveguide; and

a coupling unit configured to couple the two laser beams into one the waveguide and the further waveguide such that the waveguide and the further waveguide are independently addressable,

wherein the waveguide comprises a cladding, and

wherein the cladding comprises openings for forming the laser light modification units for allowing the laser light to leave the waveguide and pass through a transparent material of least one of the first layer and the second layer.