Heat sink

Patent metadata

Field	Value
Publication number	US-12372309-B2
Application number	US-202318459905-A
Country	US
Kind code	B2
Filing date	Sep 1, 2023
Priority date	Jun 25, 2021
Publication date	Jul 29, 2025
Grant date	Jul 29, 2025

Abstract

A heat sink including a plurality of plate-like radiating fins erected on a base plate at a predetermined erection angle θ1 with respect to an extending direction of the base plate. The radiating fins each has: a fin base portion that extends from one end to another end in a width direction of the radiating fin; a perpendicular portion that extends from one end of the fin base portion to a fin tip portion of the radiating fin on a same plane as the fin base portion; an inclined portion that extends from the perpendicular portion to the other end at a predetermined inclination angle θ2 with respect to the fin base portion and the perpendicular portion and extends from the fin tip portion to a fin intermediate portion; and a twisted portion that connects the fin base portion, the perpendicular portion, and the inclined portion.

First claim

What is claimed is:

1. A heat sink comprising:
a base plate thermally connected to a heat-generating element; and
a plurality of plate-like radiating fins erected on a main front surface of the base plate at a predetermined erection angle θ1 with respect to an extending direction of the main front surface of the base plate and thermally connected to the base plate, wherein each of the plurality of plate-like radiating fins has:
a fin base portion that is a planar surface portion that extends from one end to another end in a width direction of the radiating fin along the main front surface of the base plate and is positioned on the base plate side;
a perpendicular portion that is a planar surface portion that extends from one end of the fin base portion to a fin tip portion of the radiating fin in a height direction on a same plane as the fin base portion;
an inclined portion that is a planar surface portion that extends from the perpendicular portion to the other end of the radiating fin at a predetermined inclination angle θ2 with respect to the fin base portion and the perpendicular portion and extends from the fin tip portion to a fin intermediate portion between the fin tip portion and the fin base portion; and
a twisted portion that is a planar surface portion that connects the fin base portion, the perpendicular portion, and the inclined portion to each other.

2. The heat sink according to claim 1 , wherein the predetermined inclination angle θ2 is 2.0 degrees or more and 20 degrees or less.

3. The heat sink according to claim 2 , wherein the predetermined erection angle θ1 of the fin base portion is 70 degrees or more and 90 degrees or less.

4. The heat sink according to claim 2 , wherein a top surface portion having a planar surface shape further extends from the fin tip portion in the perpendicular portion.

5. The heat sink according to claim 4 , wherein a top surface of a radiating fin group formed by the plurality of radiating fins has an opening portion as a result of the top surface portion abutting against the fin tip portion of another adjacent one of the radiating fins.

6. The heat sink according to claim 2 , wherein a bottom surface portion having a planar surface shape further extends from a bottom portion of the fin base portion.

7. The heat sink according to claim 1 , wherein a top surface portion having a planar surface shape further extends from the fin tip portion in the perpendicular portion.

8. The heat sink according to claim 7 , wherein a top surface of a radiating fin group formed by the plurality of radiating fins has an opening portion as a result of the top surface portion abutting against the fin tip portion of another adjacent one of the radiating fins.

9. The heat sink according to claim 1 , wherein the base plate is a thermally conductive member.

10. The heat sink according to claim 1 , wherein the base plate is a thermally conductive member formed by a heat transportation member.

11. The heat sink according to claim 1 , wherein the radiating fin includes a multistage structure having a first radiating fin, and a second radiating fin stacked on the first radiating fin in a height direction of the first radiating fin, the first radiating fin is thermally connected to the base plate via a heat transportation member, and the second radiating fin is thermally connected to the heat transportation member, wherein the heat transportation member is a heat pipe having a tubular container or a vapor chamber having a planar-surface-type container.

12. The heat sink according to claim 11 , wherein a gap portion is formed between a fin tip portion of the first radiating fin and the heat transportation member.

13. The heat sink according to claim 11 , wherein a heat insulating material is interposed between a fin tip portion of the first radiating fin and the heat transportation member.

14. The heat sink according to claim 1 , wherein the predetermined erection angle θ1 of the fin base portion is 70 degrees or more and 90 degrees or less.

15. The heat sink according to claim 1 , wherein a bottom surface portion having a planar surface shape further extends from a bottom portion of the fin base portion.

16. The heat sink according to claim 1 , wherein a height of the fin base portion with respect to a height of the radiating fin is 5.0% or more and 40% or less.

17. The heat sink according to claim 1 , wherein a width of the twisted portion with respect to a width of the radiating fin is 50% or more and 90% or less.

18. The heat sink according to claim 1 , wherein a plurality of the radiating fins are disposed along a width direction of the fin base portion, and one end of the fin base portion contacts another end of the fin base portion of the adjacent radiating fin via a joining portion.

19. The heat sink according to claim 1 , wherein cooling air is supplied from a perpendicular portion side along the width direction of the radiating fin.

Assignees

• Furukawa Electric Co Ltd

Inventors

• Watanabe Yosuke

Classifications

• H10W40/73

  for cooling by change of state · CPC title

• H10W40/10

  Arrangements for heating · CPC title

• F28F1/30

  the means being attachable to the element (F28F1/32 takes precedence) · CPC title

• F28D15/0275

  Arrangements for coupling heat-pipes together or with other structures, e.g. with base blocks; Heat pipe cores · CPC title

• H05K7/20

  Modifications to facilitate cooling, ventilating, or heating · CPC title