EP0572326A2
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EP
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Heat sink for cooling a heat producing element and application
Assignee: Fujitsu Ltd
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Filing: 1993-05-28
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Granted: —
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Expires: 2013-05-28
Abstract
Abstract The heat sink has a heat sink body (1) made of a good heat conductive material and a fan assembly (2) installed inside the heat sink body. The heat sink body is efficiently air-cooled by a cooling air generated by the rotation of the fan assembly. The cooling air forcibly cools a base and a fixing wall of the base adjacent to the heat producing element and plate-like radiating fins or a pin-like radiating fins are protruded on the heat sink body to radiate the heat effectively. The position of the fan assembly is as the center of the heat sink body or is at the offset position from the center of the heat sink body. The heat sink of the present invention can be installed in a portable electronic apparatus such as a portable computer.
Inventors
- 👤 Tadashi C/O Fujitsu Limited Katsui
- 👤 Katsuhiko C/O Fujitsu Limited Nakata
- 👤 Takeshi c/o FUJITSU LIMITED Koga
- 👤 Tadanobu c/o Fujitsu Limited Matsumura
- 👤 Yoshimi c/o FUJITSU LIMITED Tanaka
- 👤 Yasuaki c/o FUJITSU LIMITED Sugimoto
- 👤 Takayuki c/o FUJITSU LIMITED Horininishi
- 👤 Takashi Kitahara
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 01:41
CPC Classifications
H; H10; H10W; H10W40/00; H10W40/40; H10W40/43; F; F28; F28F; F28F3/00; F28F3/02; F28F3/022; G; G06; G06F; G06F1/00; G06F1/16; G06F1/20; G06F1/203; G06F1/206; H10W40/60; H10W40/611
Claims Analysis
Total Claims: 30
Claim 1
Independent Claim
127 words
A heat sink (H) for cooling a heat producing element (3) mounted on a printed board (17) as a circuit parts of the electronic apparatus, producing a large amount of heat during the operation comprising a heat sink body (1) made of a material having a good heat conductivity, including a fixing wall (4) directly mounted on the heat producing element (3), characterized in that a fan assembly (2) is installed in an internal space of the heat sink body (1), including a drive (2b) and a fan blade (2a) fixed on the rotating shaft of the drive (2b); and the fixing wall (4) is forcibly cooled by a cooling air (10) generated by the rotation of the fan blade (2a) when the device (2b) is operated.
Claim 2
Dependent Claim
94 words
A heat sink (H) for cooling the heat producing element (3) as set forth in claim 1, wherein the heat sink body (1) further includes a top plate (29) supported by the fixing wall (4) or upright bars (7a) protruding from four corners of the fixing wall (4), a ventilation path (5) formed between the top plate (29) and the fixing wall (4) opening to the side of the heat sink body (1), and a circular recess (30) for receiving the fan assembly (2) formed at the center part of the top plate (29).
Claim 3
Dependent Claim
43 words
A heat sink (H) for cooling the heat producing element (3) as set forth in claim 2, wherein a plurality of comb-like heat radiating fins (6) are disposed on the top face of the fixing wall (4) and of the top plate (29).
Claim 4
Dependent Claim
102 words
A heat sink (H) for cooling the heat producing element (3) as set forth in claim 2, wherein the top plate (29) is divided into four rectangular sections, a diagonally facing pair among the four sections is opened with square openings (29a), the other pair is closed with lids (29b), each edge of the top plate (29) are extended to a lower direction along the periphery of a fixing wall (4) to form a side wall (29d), and a pair of corners corresponding to the closed sections with the lids (29b) have each a opening (29c) opens into the ventilation path (5).
Claim 5
Dependent Claim
120 words
A heat sink (H) for cooling the heat producing element (3) as set forth in claim 1, wherein the heat sink body (1) includes a base (7) and a cover (8), a fan assembly (2) is disposed on the center of the base (7), pin-like radiating fins 6 are disposed upright around a center space for the fan assembly (2), bars (7a) for supporting the cover (8) are disposed at four corners of the base (7) respectively, a center hole (8a) is disposed at the center of the cover (8), and a vertical partition (9) extended downward from a periphery of the hole (8a) for surrounding the fan assembly (2) when the cover (8) is fixed on the base (7).
Claim 6
Dependent Claim
50 words
A heat sink (H) for cooling the heat producing element (3) as set forth in claim 5, wherein a lead hole (33) and a lead groove (33a) are pormed on the bottom of the base (7) for receiving a lead (34) for supplying a power to the fan assembly (2).
Claim 7
Dependent Claim
116 words
A heat sink (H) for cooling the heat producing element (3) as set forth in claim 1, wherein the heat sink body (1) includes a base (7) and a cover (8), a fan assembly (2) is attached on the bottom face of the cover (8), a vertical partition (9) is disposed on the bottom face of the cover (8) for surrounding the fan assembly (2), openings (41) for passing a cooling air generated by the fan assembly (2) are disposed on the cover (8), pin-like radiating fins 6 are disposed on the upper face of the base (7), and bars (7a) for supporting the cover (8) are disposed at four corners of the base (7) respectively.
Claim 8
Dependent Claim
38 words
A heat sink (H) for cooling the heat producing element (3) as set forth in claim 7, wherein the fan assembly (2) draws the air from the openings (41) and corners of the openings (41) are formed round.
Claim 9
Dependent Claim
39 words
A heat sink (H) for cooling the heat producing element (3) as set forth in claims 5, 6, 7, or 8, wherein the cover (8) is fixed on the bars (7a) of the base (7) by using screws (32).
Claim 10
Dependent Claim
114 words
A heat sink (H) for cooling the heat producing element (3) as set forth in claims 5, 6, 7, or 8, wherein a fasten pin (11) having a head (11a) is disposed on each of the top faces of the bars (7), a fasten hole (12) is disposed at each of the four corners of the cover (8), a guide channel (12a) having a narrow part (12b) is disposed connecting the hole (12) and one of the edge of the cover (8), and the cover (8) is fixed on the bar (7a) of the base (7) by rotating the cover (7) with entrances of the guide channels (12a) facing to the fasten pins (11).
Claim 11
Dependent Claim
206 words
A heat sink (H) for cooling the heat producing element (3) as set forth in claims 5, 6, 7, or 8, wherein a circular arc convex face (13) having the same center as the center of the cover (8) is formed at each end of the bars (7a), a guide groove (14) is disposed at each base part of the circular arc convex face (13), a hollow notch (13a) is disposed on the middle part of each circular arc convex face (13), a triangular shaped projection (42) is disposed at each bottom face of the four corners of the cover (8), one face of the projection (42) is formed as a circular arc concave face (15) having the same center as the center of the cover (8), a fastening segment (16) corresponding to the guide groove (14) is disposed at each end of the pole, a protruding portion (15a) for fitting the hollow notch (13a) of the base (7) is disposed on the middle part of each circular arc concave face (15), and the cover (8) is fixed on the bar (7a) of the base (7) by rotating the cover (7) with its protruding portion (15a) engaged to the guide groove (14) of the base (7).
Claim 12
Dependent Claim
54 words
A heat sink (H) for cooling the heat producing element (3) as set forth in claims 5, 6, 7, 8, 9, 10, or 11, wherein cooling grooves (8c) connecting the edge of the hole (8a) and one of the side of the cover (8) are disposed on the upper face of the cover (8).
Claim 13
Dependent Claim
38 words
A heat sink (H) for cooling the heat producing element (3) as set forth in claims 5, 6, 7, 8, 9, 10, or 11, wherein radiating pins (8d) are disposed on the upper face of the cover (8).
Claim 14
Dependent Claim
64 words
A heat sink (H) for cooling the heat producing element (3) as set forth in claims 5, 6, 7, 8, 9, 10, 11, 12, or 13, wherein radiating pins (8e) are disposed on the bottom face of the cover (8) so as to be positioned in the space surrounded by the radiating fins (6) when the cover (8) is fixed on the base (7).
Claim 15
Dependent Claim
58 words
A heat sink (H) for cooling the heat producing element (3) as set forth in claims 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, or 14, wherein the fan assembly (2) is installed in the heat sink body (1) whose rotating shaft is disposed at the center of the heat sink body (1).
Claim 16
Dependent Claim
59 words
A heat sink (H) for cooling the heat producing element (3) as set forth in claims 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, or 14, wherein the fan assembly (2) is installed in the heat sink body (1) whose rotating shaft is disposed offset from the center of the heat sink body (1).
Claim 17
Dependent Claim
51 words
A heat sink (H) for cooling the heat producing element (3) as set forth in claim 16, wherein the heat sink body (1) is rectangular, and the roataing shaft of the fan assembly (2) is offset in the derection perpendicular to one of the side of the heat sink body (1).
Claim 18
Dependent Claim
48 words
A heat sink (H) for cooling the heat producing element (3) as set forth in claim 17, wherein the one of the side of the heat sink body (1) to which the rotating shaft of the fan assembly (2) is offset is closed by a windbreak wall (7b).
Claim 19
Dependent Claim
50 words
A heat sink (H) for cooling the heat producing element (3) as set forth in claim 16, wherein the heat sink body (1) is rectangular, and the roataing shaft of the fan assembly (2) is offset in the derection to one of the corner of the heat sink body (1).
Claim 20
Dependent Claim
57 words
A heat sink (H) for cooling the heat producing element (3) as set forth in claim 19, wherein windbreak walls (7b) are formed for a predetermined length by extending outer faces of the bar (7a) disposed at one of the corner of the base (7) to which the rotating shaft of the fan assembly (2) is offset.
Claim 21
Dependent Claim
60 words
A heat sink (H) for cooling the heat producing element (3) as set forth in claims 18 or 20, wherein a space for decreasing an air-pressure loss under the fan assembly (2) is formed on an upper bottom face of the base (7) under the position of the fan assembly (2) by making a stage (7c,7d) having a different depth.
Claim 22
Dependent Claim
71 words
A heat sink (H) for cooling the heat producing element (3) as set forth in claims 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, or 21, wherein a arrangement of the radiating fins (6) disposed on the upper bottom face of the base (7) are dense around the center of the base (7) and are non-dense around the side of the base (7).
Claim 23
Dependent Claim
72 words
A heat sink (H) for cooling the heat producing element (3) as set forth in claims 1, 2, 3, 4, 5, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, or 22, wherein power supply terminals (18) are disposed on the lower bottom face of the heat sink body (1), and power sipply to the fan assembly (2) is executed via the power supply terminals (18).
Claim 24
Dependent Claim
75 words
A heat sink (H) for cooling the heat producing element (3) as set forth in claims 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, or 23, wherein a temperature sensor (20) is disposed on the fixing wall (4) of the heat sink body (1), and the fan assembly (2) is ON/OFF contolled by the output signal from the temperature sensor (20).
Claim 25
Dependent Claim
78 words
A heat sink (H) for cooling the heat producing element (3) as set forth in claims 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, or 23, wherein a temperature sensor (20) is disposed on the fixing wall (4) of the heat sink body (1), and a rotation speed of the fan assembly (2) is contolled by the output signal from the temperature sensor (20).
Claim 26
Dependent Claim
116 words
A heat sink (H) as set forth in claim 1, applied to a portable electronic apparatus having a keyboard assembly (23) equipped with a reinforcing plate (22) on the bottom thereof and installed in a casing (21), and a printed board (17) having a heat producing element (3) on the upper face thereof and disposed under the keyboard assembly (23), wherein a surrounding wall (24) whose upper edge contacts to a bottom face of the reinforcing plate (22) is disposed on every edge of the heat sink (H) mounted on the heat producing element (3), and ventilation holes (25) for passing a cooling air of the heat sink (H) are disposed on the reinforcing plate (22).
Claim 27
Dependent Claim
121 words
A heat sink (H) as set forth in claims 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, or 25, applied to a printed board (17) having at least one pair of L-shaped shoes (43) with its level part bent outside, and a heat producing element (3) is mounted on the printed board (17) between the pair of the shoes (43), further comprising a fixing spring bar (44) formed as a separate member, and the fixing spring bar (44) is attached to the shoes (43) overpassing the heat sink body (1) with pressure thereby the heat sink (H) is mounted on the heat producing element (3).
Claim 28
Dependent Claim
90 words
A heat sink (H) as set forth in claims 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, or 26, further comprising a U-shaped fixing spring clip (45) having contact segments (45a) at both ends formed as a separate member, wherein the heat sink (H) is mounted to the heat producing element (3) by clipping the heat sink body (1) and the heat producing element (3) with a spring force of the clip (45).
Claim 29
Dependent Claim
113 words
A heat sink (H) as set forth in claims 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, or 25, wherein a pin-like radiating fins (6) are disposed on the top face of the base (7), further comprising: a heat sink fixture (28) having a level segment (26), a fin hole (26a) for inserting the radiating fin (6), and a L-shaped pressing segment (27) extended from the level segment (26) for pressing a bottom face of the heat producing element (3) to mount the heat sink (H) on the heat producing element (3) clipping with the level segment (26) and the pressing segment (27).
Claim 30
Dependent Claim
52 words
A heat sink (H) as set forth in claim 29, wherein the level segment (26) has a notch part (26b) for opening the side of the fin hole (26) to the side space thereof, and the radiating pin (6) is inserted to the fin hole (26a) by enlarging the notch part (26b).
References Cited (Backward Citations)
No citation records indexed.
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