Beam shaping light emitting module

• US 9,423,085 B2
• Filed: 12/03/2012
• Issued: 08/23/2016
• Est. Priority Date: 12/07/2011
• Status: Expired due to Fees

• Current Assignee: Philips Lighting BV (Koninklijke Philips N.V.)
• Original Assignee: Koninklijke Philips N.V.
• Inventors: Zahn, Fritz Helmut, Goldbach, Susanne Lina, Peeters, Martinus Petrus Joseph, Broersma, Rmy Cyrille, Weijers, Aldegonda Lucia
• Primary Examiner(s): Hines, Anne
• Assistant Examiner(s): DIAZ, JOSE
• Application Number:
  US14/362,156
• Publication Number:
  US 20140355239A1
• Time in Patent Office: 1,359 Days
• Field of Search: 362/84, 362 971- 972, 362/510, 362/166, 362/169, 362230-231, 362/239
• US Class Current: 1/1
• CPC Class Codes: F21K 9/64 using wavelength conversion means distinct or spaced from the light-generating element, e.g. a remote phosphor layer
• CPC Class Codes: H01L 33/60 Reflective elements

Abstract

There is provided a light emitting module (1) having at least one light emitting element (3) which is arranged to emit light of a primary wavelength, and a wavelength converting element (5) arranged at a distance from the at least one light emitting element (3). The wavelength converting element (5) is arranged to convert at least part of the light of a primary wavelength into light of a secondary wavelength. Further the module (1) comprises a first optical component (7) having surface structures (11) on a surface facing away from the light emitting element (3). Light rays incident on the first optical component (7) at small angles are reflected and light rays incident on the first optical component (7) at large angles are transmitted and bent towards a normal of the first optical component (7). The invention is advantageous in that it provides a compact and efficient light-directing module.

Claims

1. Light emitting module comprising:

at least one light emitting element which is arranged to emit light of a primary wavelength, each of the at least one light emitting element having a light emitting area;

a wavelength converting element arranged at a distance from the at least one light emitting element of at least a width of the smallest light emitting area of the at least one light emitting element, the wavelength converting element being arranged to convert at least part of the light of the primary wavelength into light of a secondary wavelength; and

a first optical component being positioned such that the wavelength converting element is located between the at least one light emitting element and the first optical component,

wherein the first optical component has surface structures on a surface facing away from the at least one light emitting element,

wherein the surface structures are arranged such that light rays incident on the first optical component at angles falling inside of a predetermined incidence cone centered about a normal of the first optical component are reflected, and light rays incident on the first optical component at angles falling outside of the predetermined incidence cone are at least partially transmitted and bent towards the normal to fall inside an emission cone which is centered about an optical axis of the light emitting module, the light emitting module further comprising a second optical component positioned on a side of the first optical component facing away from the wavelength converting element, wherein the second optical component has surface structures on a surface facing away from the wavelength converting element, and wherein the surface structures of the first and second optical components comprise ridges extending in a first direction and a second direction, respectively, wherein the ridges of the first and second optical components are arranged at an angle relative to each other, wherein said at least one light emitting element is arranged substantially perpendicular to said surface of said first optical component, and wherein the first optical component, the wavelength converting element and the at least one light emitting element are configured such that the percentage of the light of the primary wavelength reflected by the first optical component is larger than the percentage of the light of the secondary wavelength reflected by the first optical component.

2. Light emitting module according to claim 1, wherein at least one of the first optical component and the second optical component is rotatably mounted.

3. Light emitting module according to claim 1, wherein the surface structures are less than 100 um in height.

4. Light emitting module according to claim 1, wherein a top angle of the ridges is about 90 degrees.

5. Light emitting module according to claim 1, wherein the wavelength converting element is a phosphor layer on a carrier.

6. Light emitting module comprising:

at least one light emitting element which is arranged to emit light of a primary wavelength, each of the at least one light emitting element having a light emitting area;

a wavelength converting element arranged at a distance from the at least one light emitting element, the wavelength converting element being arranged to convert at least part of the light of the primary wavelength into light of a secondary wavelength; and

a first optical component being positioned such that the wavelength converting element is located between the at least one light emitting element and the first optical component,

wherein the first optical component has surface structures on a surface facing away from the at least one light emitting element,

wherein the surface structures are arranged such that light rays incident on the first optical component at angles falling inside of a predetermined incidence cone centered about a normal of the first optical component are reflected, and light rays incident on the first optical component at angles falling outside of the predetermined incidence cone are at least partially transmitted and bent towards the normal to fall inside an emission cone which is centered about an optical axis of the light emitting module, wherein the surface structures are further arranged so that the first optical component reflects light rays of ambient light incident on the first optical component on a side facing away from the light emitting element at angles falling outside of the emission cone such that the wavelength converting element is invisible from viewing angles falling outside of the emission cone.

7. Light emitting module comprising:

at least one light emitting element which is arranged to emit light of a primary wavelength, each of the at least one light emitting element having a light emitting area;

a wavelength converting element arranged at a distance from the at least one light emitting element, the wavelength converting element being arranged to convert at least part of the light of the primary wavelength into light of a secondary wavelength; and

a first optical component being positioned such that the wavelength converting element is located between the at least one light emitting element and the first optical component,

wherein the first optical component has surface structures on a surface facing away from the at least one light emitting element,

wherein the surface structures are arranged such that light rays incident on the first optical component at angles falling inside of a predetermined incidence cone centered about a normal of the first optical component are reflected, and light rays incident on the first optical component at angles falling outside of the predetermined incidence cone are at least partially transmitted and bent towards the normal to fall inside an emission cone which is centered about an optical axis of the light emitting module, wherein the wavelength converting element has a curved shape and wherein the first optical component is arranged on the wavelength converting element.

8. Light emitting module comprising:

at least one light emitting element which is arranged to emit light of a primary wavelength, each of the at least one light emitting element having a light emitting area;

a wavelength converting element arranged at a distance from the at least one light emitting element, the wavelength converting element being arranged to convert at least part of the light of the primary wavelength into light of a secondary wavelength; and

a first optical component being positioned such that the wavelength converting element is located between the at least one light emitting element and the first optical component,

wherein the first optical component has surface structures on a surface facing away from the at least one light emitting element,

wherein the surface structures are arranged such that light rays incident on the first optical component at angles falling inside of a predetermined incidence cone centered about a normal of the first optical component are reflected, and light rays incident on the first optical component at angles falling outside of the predetermined incidence cone are at least partially transmitted and bent towards the normal to fall inside an emission cone which is centered about an optical axis of the light emitting module, wherein the surface structures further are arranged such that a reflected light ray originating from an incident light ray incident on the first optical component at an angle falling inside of the incidence cone is shifted a distance with respect to the incident light ray, wherein the distance with respect to the incident light ray is larger than a geometrical extent of the light emitting area of the at least one light emitting element.

9. Light emitting module according to claim 8, wherein the smallest geometrical dimension of the surface structures is larger than the geometrical extent of the light emitting area of the at least one light emitting element.