Light source apparatus and vehicular headlight

1. A light source apparatus comprising:

a laser light source capable of emitting a laser beam;

a fluorescent material plate including a laser beam irradiation region and being capable of emitting light that is generated by irradiating the laser beam irradiation region with a laser beam to convert the light in wavelength in response to the laser beam irradiation;

a light scanning mechanism capable of scanning the laser beam irradiation region with the laser beam;

a first transparent conductive film pattern disposed on the fluorescent material plate in the laser beam irradiation region;

a second transparent conductive film pattern disposed on the fluorescent material plate outside the laser beam irradiation region and connected to the first transparent conductive film pattern to constitute a continuous series connection wiring; and

an electric circuit configured to be electrically connected to the second transparent conductive film pattern, detect a change in a resistance value of the series connection wiring, and function to stop driving of the laser light source when the resistance value falls outside a predetermined range.

2. The light source apparatus according to claim 1 , wherein

the first transparent conductive film pattern includes a line-and-space pattern constituted by parallel line sections with a predetermined space between adjacent parallel line sections, the line-and-space pattern being disposed and distributed in the laser beam irradiation region.

3. The light source apparatus according to claim 1 , wherein the first transparent conductive film pattern includes a pattern constituted by line sections, the line sections of the first transparent conductive film pattern extend in a first direction, and the light scanning mechanism scans in a scanning direction along a second direction crossing the first direction.

4. The light source apparatus according to claim 2 , wherein the line sections of the first transparent conductive film pattern extend in a first direction, and the light scanning mechanism scans in a scanning direction along a second direction crossing the first direction.

5. The light source apparatus according to claim 3 , wherein the laser light source emits the laser beam forming an elliptical spot with a major axis and a miner axis in the laser beam irradiation region with the miner axis extending in the first direction.

6. The light source apparatus according to claim 4 , wherein the laser light source emits the laser beam forming an elliptical spot with a major axis and a miner axis in the laser beam irradiation region with the miner axis extending in the first direction.

7. The light source apparatus according to claim 2 , wherein

when a width of the parallel line section is denoted by L and a distance of the space between the adjacent parallel line sections is denoted by S,

a value of (2L+S) is set to a predetermined value or less.

8. The light source apparatus according to claim 4 , wherein

when a width of the parallel line section is denoted by L and a distance of the space between the adjacent parallel line sections is denoted by S,

a value of (2L+S) is set to a predetermined value or less.

9. The light source apparatus according to claim 6 , wherein

when a width of the parallel line section is denoted by L and a distance of the space between the adjacent parallel line sections is denoted by S,

a value of (2L+S) is set to a predetermined value or less.

10. A vehicular headlamp comprising:

the light source apparatus according to claim 1 ; and

a projection lens configured to project light emitted from the fluorescent material plate forward.

11. The vehicular headlamp according to claim 10 , wherein

the first transparent conductive film pattern includes a line-and-space pattern constituted by parallel line sections with a predetermined space between adjacent parallel line sections, the line-and-space pattern being disposed and distributed in the laser beam irradiation region.

12. The vehicular headlamp according to claim 10 , wherein the first transparent conductive film pattern includes a pattern constituted by line sections, the line sections of the first transparent conductive film pattern extend in a first direction, and the light scanning mechanism scans in a scanning direction along a second direction crossing the first direction.

13. The vehicular headlamp according to claim 11 , wherein the line sections of the first transparent conductive film pattern extend in a first direction, and the light scanning mechanism scans in a scanning direction along a second direction crossing the first direction.

14. The vehicular headlamp according to claim 12 , wherein the laser light source emits the laser beam forming an elliptical spot with a major axis and a miner axis in the laser beam irradiation region with the miner axis extending in the first direction.

15. The vehicular headlamp according to claim 13 , wherein the laser light source emits the laser beam forming an elliptical spot with a major axis and a miner axis in the laser beam irradiation region with the miner axis extending in the first direction.

16. The vehicular headlamp according to claim 11 , wherein

when a width of the parallel line section is denoted by L and a distance of the space between the adjacent parallel line sections is denoted by S,

a value of (2L+S) is set to a predetermined value or less.

17. The vehicular headlamp according to claim 13 , wherein

when a width of the parallel line section is denoted by L and a distance of the space between the adjacent parallel line sections is denoted by S,

a value of (2L+S) is set to a predetermined value or less.