Vehicle headlamp
A vehicle headlamp is provided including a road surface pattern-rendering unit and a dust removal device. The road surface pattern-rendering unit is installed to a headlamp unit provided to a front end section of a vehicle, and forms a specific light distribution pattern by causing light shone from a light source to be reflected by a MEMS mirror toward a vehicle front side. The dust removal device is provided to the headlamp unit and removes dust adhering to the MEMS mirror.
1. A vehicle headlamp comprising:
a road surface pattern-rendering unit that is installed to a headlamp unit, the headlamp unit being provided to a front end section of a vehicle and the road surface pattern-rendering unit forming a specific light distribution pattern by causing light shone from a light source to be reflected by a MEMS mirror toward a vehicle front side; and
a dust removal device that is provided to the headlamp unit, the dust removal device removing dust adhering to the MEMS mirror, wherein
the MEMs mirror includes a support portion including a front face to which a mirror main body is fixed, the mirror main body reflecting the light;
the dust removal device includes an air blower that blows air directed toward the MEMS mirror, the air blower being above and perpendicular to the support portion;
the road surface pattern-rendering unit includes a light source unit including a light source and a heatsink that holds the light source; and
the light source unit is disposed below the MEMS mirror in a direction air is blown from the air blower so as to face the air blower.
2. The vehicle headlamp of claim 1 , wherein the air blower is configured as a ventilation fan or a blower including plural fins.
3. The vehicle headlamp of claim 1 , wherein the MEMS mirror reflects the light through a lens and the air blower is attached to a lens holder that holds the lens.
4. A vehicle headlamp comprising:
a road surface pattern-rendering unit that is installed to a headlamp unit, the headlamp unit being provided to a front end section of a vehicle and the road surface pattern-rendering unit forming a specific light distribution pattern by causing light shone from a light source to be reflected by a MEMS mirror toward a vehicle front side; and
a dust removal device that is provided to the headlamp unit, the dust removal device removing dust adhering to the MEMS mirror, wherein
the MEMS mirror includes a mirror main body that reflects light shone from the light source, a support portion attached to a rear side of the mirror main body, a transparent cover that covers the mirror main body from the vehicle front side, and a sealing member that elastically couples the cover to the support portion;
the dust removal device is configured by a vibrator above the support portion that causes the cover to vibrate;
the road surface pattern-rendering unit includes a light source unit including a light source and a heatsink that holds the light source; and
the light source unit is disposed below the MEMS mirror opposite the vibrator.
5. The vehicle headlamp of claim 4 , wherein an upper end portion of the cover is coupled to the vibrator.
6. The vehicle headlamp of claim 4 , wherein a vibration frequency of the vibrator is matched to a natural frequency of the cover.
7. The vehicle headlamp of claim 4 , wherein a vibration frequency of the vibrator is set to a specific frequency that reduces speckling in the specific light distribution pattern.
8. The vehicle headlamp of claim 4 , wherein the vibrator vibrates with a simple harmonic motion in a vertical direction.
9. The vehicle headlamp of claim 4 , wherein the vibrator vibrates with a random vibration.