Automotive lamp

1. An automotive lamp comprising:

a semiconductor light emitting device as a light source;

a heatsink which radiates heat produced by the semiconductor light emitting device, the heatsink including a plurality of plate fins installed upright on a base part and a plurality of ventilation passages formed between the plate fins;

a centrifugal fan which performs a forced air cooling of the plate fins by sending air through the ventilation passages of the heatsink, the centrifugal fan having air inlets open in an axial direction thereof for drawing air in and a plurality of air outlets for discharging air in a plurality of directions perpendicular to the axial direction thereof; and

a lamp housing which houses the semiconductor light emitting device, heatsink, and centrifugal fan,

wherein the plate fins of the heatsink are formed such that an entrance of at least one of the plurality of ventilation passages faces each of the air outlets of the centrifugal fan, and

wherein the heatsink further includes a plurality of fins in the axial direction of the centrifugal fan, and the plurality of fins are subjected to a forced air cooling by an intake of air caused by the centrifugal fan.

2. An automotive lamp according to claim 1 , wherein each ventilation passage whose entrance faces each of the air outlets of the centrifugal fan extends in a direction parallel to an air discharge direction of each of the air outlets.

3. An automotive lamp according to claim 1 , wherein a cover used to prevent air sent from the centrifugal fan from being leaked along the ventilation passages is provided at upper ends of the plate fins.

4. An automotive lamp comprising:

a semiconductor light emitting device as a light source;

a heatsink which radiates heat produced by the semiconductor light emitting device, the heatsink including a plurality of plate fins installed upright on a base part and a plurality of ventilation passages formed between the plate fins;

a centrifugal fan which performs a forced air cooling of the plate fins by sending air through the ventilation passages of the heatsink, the centrifugal fan having air inlets open in an axial direction thereof for drawing air in and a plurality of air outlets for discharging air in a plurality of directions perpendicular to the axial direction thereof; and

a lamp housing which houses the semiconductor light emitting device, heatsink, and centrifugal fan,

wherein the plate fins of the heatsink are formed such that an entrance of at least one of the plurality of ventilation passages faces each of the air outlets of the centrifugal fan,

the heatsink further includes a plurality of fins in the axial direction of the centrifugal fan, and the plurality of fins are subjected to a forced air cooling by an intake of air caused by the centrifugal fan,

wherein the fins which are subjected to a forced air cooling by an intake of air caused by the centrifugal fan are plate fins, and

the plate fins extend in a direction perpendicular to a direction in which the plate fins, which are subjected to a forced air cooling by a discharge of air caused by the centrifugal fan, extend.

5. An automotive lamp according to claim 4 , wherein the plate fins which are subjected to a forced air cooling by an intake of air caused by the centrifugal fan are formed in a manner such that the height thereof is lower than that of the plate fins which are subjected to a forced air cooling by a discharge of air caused by the centrifugal fan.

6. An automotive lamp according to claim 5 , wherein the centrifugal fan is installed on the plate fins which are subjected to a forced cooling air by an intake of air caused by the centrifugal fan.

7. An automotive lamp comprising:

a semiconductor light emitting device as a light source;

a heatsink which radiates heat produced by the semiconductor light emitting device, the heatsink including a plurality of plate fins installed upright on a base part and a plurality of ventilation passages formed between the plate fins;

a centrifugal fan which performs a forced air cooling of the plate fins by sending air through the ventilation passages of the heatsink, the centrifugal fan having air inlets open in an axial direction thereof for drawing air in and a plurality of air outlets for discharging air in a plurality of directions perpendicular to the axial direction thereof; and

a lamp housing which houses the semiconductor light emitting device, heatsink, and centrifugal fan,

wherein the plate fins of the heatsink are formed such that an entrance of at least one of the plurality of ventilation passages faces each of the air outlets of the centrifugal fan,

wherein the centrifugal fan is structured such that air drawn in from one axial direction is dischargeable in a plurality of directions perpendicular to the axial direction and is dischargeable in the other axial direction, and

wherein regions of the heatsink in the other axial direction of the centrifugal fan are subject to a forced air cooling by a discharge of air caused by the centrifugal fan in the other axial direction.

8. An automotive lamp according to claim 7 , wherein a plurality of pin fins are provided on the regions of the heatsink in the other axial direction of the centrifugal fan.

9. An automotive lamp according to claim 8 , wherein the pin fins are formed in a manner such that the height thereof is lower than that of the plate fins which are subjected to a forced air cooling by a discharge of air in a direction perpendicular to the axial direction of the centrifugal fan.

10. An automotive lamp according to claim 9 , wherein the centrifugal fan is installed on the pin fins.