Light emitting module

Patent metadata

Field	Value
Publication number	US-10240739-B2
Application number	US-201615136106-A
Country	US
Kind code	B2
Filing date	Apr 22, 2016
Priority date	Apr 23, 2015
Publication date	Mar 26, 2019
Grant date	Mar 26, 2019

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 and a second optical path conversion member for providing the first reflected light as second reflected light to pass through the condensing lens.

First claim

What is claimed is:

1. A light emitting module comprising:
a lens;
a laser diode configured to provide first light that passes through the lens;
a first optical path conversion member configured to reflect the first light and provide first reflected light that passes through the lens; and
a second optical path conversion member configured to provide the first reflected light as second reflected light that passes to pass through the lens,
wherein the second optical path conversion member includes a phosphor layer configured to convert a wavelength of incident light and a reflection layer configured to provide the first reflected light as the second reflected light that passes through the lens, and
wherein the laser diode is positioned so as to be decentered with respect to a central axis of the lens; and
wherein the laser diode and the second optical path conversion member are arranged so as to be opposite each other with respect to the central axis of the lens.

2. The light emitting module according to claim 1 , wherein the first optical path conversion member is positioned so as to be decentered with respect to the central axis of the lens.

3. The light emitting module according to claim 2 , wherein an optical axis of the second optical path conversion member is positioned so as to be decentered with respect to the central axis of the lens.

4. The light emitting module according to claim 2 , wherein a first distance between the central axis of the lens and the laser diode is less than a radius of the lens.

5. The light emitting module according to claim 2 , wherein a second distance between the central axis of the lens and the first optical path conversion member is less than a radius of the lens.

6. The light emitting module according to claim 3 , wherein a third distance between the central axis of the lens and the second optical path conversion member is less than a radius of the lens.

7. The light emitting module according to claim 1 , wherein the laser diode, the second optical path conversion member, the lens, and the first optical path conversion member are arranged in a straight line in order when viewed from above.

8. The light emitting module according to claim 1 , further comprising an auxiliary condensing lens configured to condense the second reflected light having passed through the lens.

9. The light emitting module according to claim 8 , wherein the auxiliary condensing lens is positioned so as to be decentered with respect to a central axis of the lens.

10. The light emitting module according to claim 8 , wherein the auxiliary condensing lens comprises:
a first refractive surface exposed toward the lens; and
a second refractive surface opposite the first refractive surface,
the first refractive surface and the second refractive surface having different shapes.

11. The light emitting module according to claim 10 , wherein
a vertical refractive section of the auxiliary condensing lens is different from a horizontal refractive section of the auxiliary condensing lens.

12. The light emitting module according to claim 11 , wherein the vertical refractive section has a smaller radius of curvature than the horizontal refractive section.

13. The light emitting module according to claim 11 , wherein the horizontal refractive section is flat, and the vertical refractive section is curved.

14. The light emitting module according to claim 1 , wherein the second optical path conversion member is positioned on a central axis of the lens.

15. The light emitting module according to claim 14 , further comprising an auxiliary condensing lens configured to condense the second reflected light having passed through the lens.

16. The light emitting module according to claim 15 , wherein an optical axis of the auxiliary condensing lens is aligned with the central axis of the lens.

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

18. The light emitting module according to claim 17 , wherein the first optical path conversion member covers a portion of the front surface of the lens.

19. The light emitting module according to claim 17 , wherein the lens is provided with a receiving recess configured to receive the first optical path conversion member.

20. A headlight comprising:
a housing; and
a light-emitting module provided in the housing,
wherein the light-emitting module includes:
a lens;
a laser diode configured to provide first light that passes through the lens;
a first optical path conversion member configured to reflect the first light and provide first reflected light that passes through the lens; and
a second optical path conversion member configured to provide the first reflected light as second reflected light that passes to pass through the lens,
wherein the second optical path conversion member includes a phosphor layer configured to convert a wavelength of incident light and a reflection layer configured to provide the first reflected light as the second reflected light that passes through the lens, and
wherein the laser diode is positioned so as to be decentered with respect to a central axis of the lens; and wherein the laser diode and the second optical path conversion member are arranged so as to be opposite each other with respect to the central axis of the lens.

21. A vehicle comprising:
a body; and
a headlight provided at the body,
wherein the headlight includes:
a housing; and
a light-emitting module provided in the housing, the light-emitting module including:
a lens;
a laser diode configured to provide first light that passes through the lens;
a first optical path conversion member configured to reflect the first light and provide first reflected light that passes through the lens; and
a second optical path conversion member configured to provide the first reflected light as second reflected light that passes to pass through the lens,

wherein the second optical path conversion member includes a phosphor layer configured to convert a wavelength of incident light and a reflection layer configured to provide the first reflected light as the second reflected light that passes through the lens, and
wherein the laser diode is positioned so as to be decentered with respect to a central axis of the lens; and wherein the laser diode and the second optical path conversion member are arranged so as to be opposite each other with respect to the central axis of the lens.

22. A light-emitting module comprising:
a lens;
a light source disposed at a first side of the lens to emit light into the lens;
a first reflector that is disposed at a second side of the lens and that is configured to (i) change a path of the light having made a first pass through the lens and (ii) supply the light back to the lens; and
a second reflector that is disposed at the first side of the lens and that is configured to (i) change a path of the light having made a second pass through the lens and (ii) supply the light to the lens,
wherein the first reflector is positioned so as to be decentered with respect to the central axis of the lens; and wherein the light source and the second reflector are arranged so as to be opposite each other with respect to the central axis of the lens.

23. The light-emitting module of claim 22 , wherein the lens is lens configured to concentrate incident light into a first spot.

24.

Assignees

• Lg Electronics Inc

Inventors

• Park Jun
• Jeoung Byungwoo
• Yeo Sangok

Classifications

• F21V13/12

  Combinations of only three kinds of elements · CPC title

• F21V5/04

  of lens shape · CPC title

• F21S41/172

  High-intensity discharge light sources · CPC title

• F21S41/176

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

• F21S41/30

  characterised by reflectors · CPC title