Light emitting module and optical wavelength converting member

1. A light emitting module comprising:

a light emitting element; and

an optical wavelength converting member,

wherein the optical wavelength converting member includes a light incident plane facing the light emitting element, a light output plane, and an outer plane which is a plane except for said light incident plane and said light output plane,

wherein the optical wavelength converting member is adapted to convert a wavelength of light emitted from the light emitting element and entered from the light incident plane into the optical wavelength converting member and to output the wavelength-converted light from the light output plane,

wherein an average roughness “Ra” of the light output plane is larger than 0.3 micrometers,

wherein an average roughness “Ra” of at least a portion of the outer plane is lower than an average roughness of the light output plane,

wherein said average roughness “Ra” of said portion of the outer plane is smaller than, or equal to 0.3 micrometers, and larger than or equal to 0.020 micrometers, and

wherein a photon ratio between the light output plane and the outer plane exceeds 0.5.

2. The light emitting module according to claim 1 , wherein the optical wavelength converting member has a shore-D-hardness which is larger than, or equal to 60.

3. A light emitting module comprising:

a light emitting element; and

an optical wavelength converting member,

wherein the optical wavelength converting member includes a light incident plane facing the light emitting element, a light output plane, and an outer plane which is a plane except for said light incident plane and said light output plane,

wherein the optical wavelength converting member is adapted to convert a wavelength of light emitted from the light emitting element and entered from the light incident plane into the optical wavelength converting member and to output the wavelength-converted light from the light output plane,

wherein an average roughness “Ra” of the light output plane is larger than 0.3 micrometers,

wherein an average roughness “Ra” of at least a portion of the outer plane is lower than an average roughness of the light output plane,

wherein said average roughness “Ra” of said portion of the outer plane is smaller than, or equal to ¼ of a central wavelength of said wavelength-converted light, and larger than or equal to 0.020 micrometers, and

wherein a photon ratio between the light output plane and the outer plane exceeds 0.5.

4. The light emitting module according to claim 3 , wherein the optical wavelength converting member has a shore-D-hardness which is larger than, or equal to 60.

5. An optical wavelength converting member comprising:

a light incident plane;

a light output plane, and

an outer plane which is a plane except for said light incident plane and said light output plane,

wherein the optical wavelength converting member is adapted to convert a wavelength of light entered from the light incident plane into the optical wavelength converting member and to output the wavelength-converted light from the light output plane,

wherein an average roughness “Ra” of the light output plane is larger than 0.3 micrometers.

wherein an average roughness “Ra” of at least a portion of the outer plane is lower than an average roughness of the light output plane, and

wherein said average roughness “Ra” of said portion of the outer plane is smaller than, or equal to 0.3 micrometers, and larger than or equal to 0.020 micrometers, and

wherein a photon ratio between the light output plane and the outer plane exceeds 0.5.

6. The light emitting module according to claim 1 , wherein a ratio of said average roughness of the light output plane divided by said average roughness of said portion of the outer plane is greater than or equal to 2 and less than or equal to 30.

7. The light emitting module according to claim 3 , wherein a ratio of said average roughness of the light output plane divided by said average roughness of said portion of the outer plane is greater than or equal to 2 and less than or equal to 30.

8. The optical wavelength converting member according to claim 5 , wherein a ratio of said average roughness of the light output plane divided by said average roughness of said portion of the outer plane is greater than or equal to 2 and less than or equal to 30.

9. The light emitting module according to claim 1 , wherein the light output plane comprises a plurality of projected portions, and

wherein an arranging interval of the projection portion is shorter than a repetition interval of patterns in electrode patterns to which currents for emitting light are supplied.

10. The light emitting module according to claim 3 , wherein the light output plane comprises a plurality of projected portions, and

wherein an arranging interval of the projection portion is shorter than a repetition interval of patterns in electrode patterns to which currents for emitting light are supplied.

11. The optical wavelength converting member according to claim 5 , wherein the light output plane comprises a plurality of projected portions, and

wherein an arranging interval of the projection portion is shorter than a repetition interval of patterns in electrode patterns to which currents for emitting light are supplied.

12. The light emitting module according to claim 1 , wherein the optical wavelength converting member is a plate shape member having a substantially the same size with a light emitting plane of the light emitting element.

13. The light emitting module according to claim 3 , wherein the optical wavelength converting member is a plate shape member having a substantially the same size with a light emitting plane of the light emitting element.

14. The optical wavelength converting member according to claim 5 , wherein the optical wavelength converting member is a plate shape member having a substantially the same size with a light emitting plane of the light emitting element.