Automotive lamp

• US 8,118,462 B2
• Filed: 06/23/2009
• Issued: 02/21/2012
• Est. Priority Date: 06/23/2008
• Status: Active Grant

• Current Assignee: Koito Manufacturing Company Limited
• Original Assignee: Koito Manufacturing Company Limited
• Inventors: Inoue, Takashi, Yasuda, Yuji
• Primary Examiner(s): Ward, John A
• Application Number:
  US12/490,058
• Publication Number:
  US 20090316425A1
• Time in Patent Office: 973 Days
• Field of Search: 362/249.02, 362/294, 362/373, 362/546, 362/547
• US Class Current: 362/547
• CPC Class Codes: F21S 41/148 the main emission direction of the LED being perpendicular to the optical axis
• CPC Class Codes: F21S 45/435 circulating the gas within a closed system
• CPC Class Codes: F21V 29/67 characterised by the arrangement of fans
• CPC Class Codes: F21V 29/763 the planes containing the fins or blades having the direction of the light emitting axis
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]

Abstract

An automotive lamp includes an LED as a light source, a heatsink for radiating heat produced by the LED, the heatsink including a plurality of plate fins installed upright on base parts and a plurality of ventilation passages formed between the plate fins, a centrifugal fan for performing the forced air cooling of the plate fins by sending air through the ventilation passages of the heatsink, the centrifugal fan having air inlets in an axial direction for drawing air in, a left-side air outlet and a right-side air outlet for discharging air in left-right directions perpendicular to the axial direction, and a lamp housing for housing the LED, heatsink and centrifugal fan. The plate fins of the heatsink are formed such that the entrance of at least one of a plurality of ventilation passages faces the left-side air outlet and the right-side outlet of the centrifugal fan.

Claims

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.