Light emitting module

Patent metadata

Field	Value
Publication number	US-9982861-B2
Application number	US-201615136241-A
Country	US
Kind code	B2
Filing date	Apr 22, 2016
Priority date	Apr 23, 2015
Publication date	May 29, 2018
Grant date	May 29, 2018

Abstract

A light-emitting module is disclosed. The light-emitting module includes a condensing lens for condensing incident light into a space, a light source for providing first light to pass through the condensing lens, a first optical path conversion member for reflecting the first light to provide first reflected light to pass through the condensing lens, a second optical path conversion member for reflecting the first reflected light to provide second reflected light to pass through the condensing lens and a wavelength conversion unit for receiving the second reflected light, converting a wavelength of the received second reflected light, and radiating light the wavelength of which has been converted.

First claim

What is claimed is:

1. A light emitting module comprising:
a condensing lens for condensing incident light into a space;
a light source for providing first light to pass through the condensing lens;
a first optical path conversion member for reflecting the first light to provide first reflected light to pass through the condensing lens;
a second optical path conversion member for reflecting the first reflected light to provide second reflected light to pass through the condensing lens; and
a wavelength conversion unit for receiving the second reflected light, converting a wavelength of the received second reflected light, and radiating light the wavelength of which has been converted,
wherein the condensing lens is divided into a first region and a second region by a section cut along a central axis of the condensing lens, and
wherein the first light is incident on the first region, the first reflected light is incident on the second region, and the second reflected light is incident on the second region.

2. The light emitting module according to claim 1 , wherein the wavelength conversion unit is disposed between the second optical path conversion member and the condensing lens.

3. The light emitting module according to claim 2 , wherein the wavelength conversion unit is positioned on a central axis of the condensing lens.

4. The light emitting module according to claim 2 , wherein the wavelength conversion unit is positioned so as to be decentered with respect to a central axis of the condensing lens.

5. The light emitting module according to claim 1 , further comprising an auxiliary condensing lens for condensing the second reflected light.

6. The light emitting module according to claim 5 , wherein the wavelength conversion unit is disposed between the condensing lens and the auxiliary condensing lens.

7. The light emitting module according to claim 5 , wherein the auxiliary condensing lens is positioned so as to be decentered with respect to a central axis of the condensing lens.

8. The light emitting module according to claim 5 , wherein the auxiliary condensing lens is configured such that a central axis of the auxiliary condensing lens is aligned with a central axis of the condensing lens.

9. The light emitting module according to claim 1 , wherein the wavelength conversion unit is positioned on one surface of the condensing lens.

10. The light emitting module according to claim 1 , wherein the wavelength conversion unit comprises:
an incidence surface on which the second reflected light is incident;
an emission surface from which the incident second reflected light is emitted, the emission surface facing the incidence surface; and
side surfaces, each having a smaller area than the incidence surface and the emission surface.

11. The light emitting module according to claim 10 , further comprising a heat sink disposed on the side surfaces of the wavelength conversion unit in a contact fashion.

12. The light emitting module according to claim 10 , wherein the incidence surface and the emission surface of the wavelength conversion unit are arranged so as to intersect a central axis of the condensing lens.

13. The light emitting module according to claim 1 , wherein the light source and the first optical path conversion member are positioned so as to be decentered with respect to a central axis of the condensing lens.

14. The light emitting module according to claim 13 , wherein the second optical path conversion member is positioned so as to be decentered with respect to the central axis of the condensing lens.

15. The light emitting module according to claim 14 , wherein the light source and the second optical path conversion member are arranged so as to be opposite to each other with respect to the central axis of the condensing lens.

16. The light emitting module according to claim 1 , wherein the first light is incident parallel to the central axis of the condensing lens.

17. The light emitting module according to claim 1 , wherein the second reflected light emitted from the second optical path conversion member passes through a central axis of the condensing lens.

18. The light emitting module according to claim 1 , wherein the first optical path conversion member is disposed on a front surface of the condensing lens.

19. The light emitting module according to claim 18 , wherein the first optical path conversion member comprises a plurality of dielectric layers having different refractive indices.

20. A light emitting module comprising:
a condensing lens for condensing incident light into a space;
a light source for providing first light to pass through the condensing lens;
a first optical path conversion member for reflecting the first light to provide first reflected light to pass through the condensing lens;
a second optical path conversion member for reflecting the first reflected light to provide second reflected light to pass through the condensing lens; and
a wavelength conversion unit for receiving the second reflected light, converting a wavelength of the received second reflected light, and radiating light the wavelength of which has been converted,
wherein the wavelength conversion unit comprises:
an incidence surface on which the second reflected light is incident,
an emission surface from which the incident second reflected light is emitted, the emission surface facing the incidence surface, and
side surfaces, each having a smaller area than the incidence surface and the emission surface.

Assignees

• Lg Electronics Inc

Inventors

• Park Jun
• Jeoung Byungwoo
• Yeo Sangok

Classifications

• F21V13/12

  Combinations of only three kinds of elements · CPC title

• F21S41/176

  Light sources where the light is generated by photoluminescent material spaced from a primary light generating element · CPC title

• F21V5/04

  of lens shape · CPC title

• F21S41/172

  High-intensity discharge light sources · CPC title

• F21S41/295

  specially adapted to projection lenses · CPC title