TW201319233A - Precoated aluminum alloy plate for heat dissipation members, and heat dissipation member using same - Google Patents

Abstract

A precoated aluminum alloy plate (1) for heat dissipation members, which comprises an aluminum alloy plate (10), a first coating film (11) that is formed on one surface of the aluminum alloy plate (10), and a second coating film (12) that is formed on the other surface of the aluminum alloy plate (10); and a heat dissipation member (5) which uses the precoated aluminum alloy plate (1). The coating film (11) has heat dissipation properties more excellent than those of the surface of the aluminum alloy plate (10); and the second coating film (12) has a bonding function of forming an adhesive by being melted or softened when heated. The first coating film (11) may have a configuration which is achieved by having a first base resin contain a heat dissipating substance, said first base resin having a softening point higher than 150 DEG C and being composed of at least one resin that is selected from among urethane resins, polyolefin resins, epoxy resins, fluororesins and polyester resins.

Description

Precoated aluminum alloy plate for heat dissipating member and heat dissipating member using the precoated aluminum alloy plate

The present invention relates to a pre-coated aluminum alloy plate for a heat dissipating member which is suitable as a material for a heat dissipating member for promoting heat dissipation of an electric device such as a lighting fixture, and a heat dissipating member produced using the same.

For example, with the improvement of the performance of LEDs, lighting devices using LEDs as light sources have been put into practical use. In such a lighting fixture, for example, in order to promote heat dissipation, a heat dissipating member in which fins are integrally formed is provided. In the heat-dissipating member of the prior art, for example, a forged product of an aluminum alloy having a heat-dissipating fin, which is generally disclosed in Patent Document 1, or a cast product, is used.

[prior technical literature] [Patent Document]

[Patent Document 1] Japanese Patent Laid-Open Publication No. 2010-73654

The prior art heat dissipating member made of a forged or cast product of an aluminum alloy can ensure a certain degree of heat dissipation, but the weight is heavy and the productivity is low, and it becomes a costly thing. Therefore, it is desirable to develop a heat dissipating member which can achieve a heat dissipation of equal to or higher than that of the heat dissipating member of the prior art and which is lightweight and low in cost.

The present invention has been made in view of such a background, and an object thereof is to provide a material capable of forming a heat dissipating member which is excellent in heat dissipation and lightweight, and which is lightweight and low in cost by using the material. Heat sink component.

One aspect of the present invention is a pre-coated aluminum alloy plate for a heat dissipating member, the pre-coated aluminum alloy plate for the heat dissipating member, comprising an aluminum alloy plate and a first coating film formed on one of the surfaces thereof And a second coating film formed on the other surface, the pre-coated aluminum alloy plate for the heat dissipating member, wherein the first coating film has a heat dissipation superior to that of the surface of the aluminum alloy plate In the second coating film, the second coating film is provided with a function of melting or softening by heating to form an adhesive (Application 1).

According to still another aspect of the present invention, a heat dissipating member includes: a bottom surface portion having a joint surface to be joined to another member; and a fin portion that is erected from the bottom surface portion, the heat dissipating member The bottom surface portion and the fin portion are formed by bending a pre-coated aluminum alloy plate for the heat dissipating member, and the bonding surface of the bottom surface portion is provided with the second coating film. The composition of the face (application 10).

Still another aspect of the present invention is a heat dissipating member which is a heat dissipating member which is formed by bending a precoated aluminum alloy sheet for a heat dissipating member along a plurality of bending starting points and forming a wave shape. The member is characterized in that the one end side of the forming direction of the bending starting line is provided with a joint end portion for bonding to another member (Application 13).

The precoated aluminum alloy sheet for a heat dissipating member is a first coating film having excellent heat dissipation properties as described above and a second coating film having the following function. Therefore, by bringing the surface having the second coating film into contact with and heating the other member, the second coating film functions as an adhesive, and the pre-coated aluminum alloy sheet for the heat dissipating member can be used. The heat radiating member is easily integrated with the other members described above. In this way, the heat generated by the other members can efficiently dissipate heat by utilizing the excellent heat dissipation property of the first coating film in the heat dissipating member formed of the pre-coated aluminum alloy plate for the heat dissipating member.

In addition, since the aluminum alloy sheet is used as the base material, the pre-coated aluminum alloy sheet for the heat dissipating member is excellent in workability and can be easily processed into a desired shape. Therefore, it can be easily processed into an optimum shape for another member (a member such as a lighting fixture or another electric device) that is an object that enhances heat dissipation characteristics.

Further, the pre-coated aluminum alloy sheet for the heat dissipating member can be applied to the first coating film and the second coating film in a large amount and efficiently using a continuous production line. Therefore, it is possible to perform processing that is very efficient and inexpensive.

Further, the pre-coated aluminum alloy sheet for the heat dissipating member can also be used as it is attached to the surface of the object while being maintained in a plate shape. In this case, the above-mentioned 1 The excellent heat dissipation of the coating film is effective for dissipating heat from the heat transmitted from other members.

Further, the heat dissipating member in the form of the bottom surface portion and the fin portion is formed by bending the pre-coated aluminum alloy sheet for the heat dissipating member, and the surface of the second coating film is provided as described above. To form the joint surface at the bottom portion. By using the subsequent function of the second coating film described above, the other members and the bottom surface portion can be easily integrated, and the fin portion can be easily erected. Further, by the presence of the fins, the surface area of the first coating film can be increased, and excellent heat dissipation properties can be obtained.

Further, in the heat dissipating member in which the pre-coated aluminum alloy sheet for a heat dissipating member is bent along a plurality of bending starting line lines and formed into a wave shape, the surface area of the first coating film can be increased. , and can get excellent heat dissipation. Further, a heat dissipating member having a joint end portion joined to another member is provided at one end side in the direction in which the bending starting line is formed, and the surface area of the wavy side surface is increased, and the side surface can be dissipated. Sexual improvement.

Further, when joining with another member, for example, the joint end portion of the heat dissipating member is placed on another member and heated. Thereby, at least a part of the second coating film of the heat dissipating member is melted or softened, and the second coating film which is melted or softened is expanded by other members by its own weight. Further, by cooling it, the second coating film which is melted or softened is cured, and the other member and the heat dissipating member can be easily joined.

As the material of the aluminum alloy plate of the base material of the pre-coated aluminum alloy plate for the heat radiating member, a material suitable for forming processing such as a 1000-series, a 3000-series, a 5000-series, or a 6000-series can be used. For example, there are 1050, 8021, 3003, 3004, 3104, 5052, 5182, 5N01, and the like. Although the thickness of the aluminum alloy plate is not particularly limited, it is preferably from 0.3 mm to 1.5 mm from the viewpoint of easiness of production and ease of processing.

In the pre-coated aluminum alloy sheet for a heat dissipating member, the first coating film may have a softening point of more than 150 ° C and an average number of particles from the fluorocarbon resin. At least 1 selected from the group consisting of urethane resin having a molecular weight of 10,000 to 40000, a polyolefin resin having a number average molecular weight of 10,000 to 40000, an epoxy resin having a number average molecular weight of 1,000 to 15,000, and a polyester resin having a number average molecular weight of 10,000 to 40000. Among the first base resins, the heat-generating material is contained (application 2).

In other words, as the first coating film, a synthetic resin having a softening point of more than 150 ° C can be used as the base resin. Thereby, when the second coating film is heated and melted or softened, the first coating film can be easily prevented from being melted or softened. More preferably, the softening point of the base resin of the first coating film is 170 ° C or higher, and more preferably 200 ° C or higher. Moreover, from the viewpoint of the ease of obtaining, a synthetic resin having a softening point of 300 ° C or less can be used as the base resin of the first coating film.

Further, as the first coating film, a synthetic resin having a range of the above-described number average molecular weight can be used. By using the number with this range The synthetic resin having a quantitative average molecular weight is easy to ensure the formability of the coating film. When the number average molecular weight of each synthetic resin is less than the lower limit of the formula, the coating film may become hard and the formability may deteriorate. On the other hand, when the value of the upper limit is exceeded, there may be The coating film becomes too soft and the scratch resistance is lowered.

In addition, as the first coating film, a fluorocarbon resin can be used as described above, and the molecular weight of the fluorocarbon resin is not particularly limited, and it can be industrially easily obtained. From the viewpoint of easy availability, the molecular weight of the fluororesin is preferably 50,000 to 10,000,000.

Further, as the polyolefin resin, for example, a polyethylene resin, a polypropylene resin, or the like can be used.

In addition, the first coating film may contain one or two or more kinds of titanium oxide, carbon, cerium oxide, aluminum oxide, and zirconium oxide as the heat-dissipating material (Application No. 3). By using such a substance as the heat-dissipating substance, the heat dissipation property of the first coating film can be easily improved.

The heat dissipation property of the first coating film can be evaluated by the integrated radiance of infrared rays. For example, the first coating film is preferably adjusted so that the integrated radiance of infrared rays is 70% or more. By this, stable heat dissipation characteristics can be obtained. The integrated radiance of infrared rays can be measured by comparing the amount of infrared radiation between the sample and the ideal black body by FT-IR. In addition, in general, the integral radiance of infrared rays of an aluminum alloy plate is 15 to 18%.

Further, the first coating film may contain oxidation from an average particle diameter of 0.1 to 100 μm with respect to the weight portion of the first base resin 100. At least one selected from the group consisting of 0.5 to 200 parts by weight of titanium, 0.5 to 25 parts by weight of fine powder, 0.5 to 200 parts by weight of yttrium oxide, 0.5 to 200 parts by weight of alumina, and 0.5 to 200 parts by weight of zirconia. Application 4).

In other words, when titanium oxide is contained in the first coating film, the average particle diameter is preferably in the range of 0.1 to 100 μm. Thereby, the problem that the particles of titanium oxide are separated and separated from the first coating film can be suppressed, and the heat dissipation improving effect of stability can be obtained.

In addition, when the titanium oxide is contained in the first coating film, the content thereof is preferably 0.5 to 200 parts by weight with respect to 100 parts by weight of the first base resin. Thereby, the problem that the particles of titanium oxide are separated and peeled off from the first coating film can be suppressed, and the heat dissipation improving effect of stability can be obtained.

Further, as the carbon of the fine powder, carbon having an average particle diameter of 1 nm to 500 nm can be used. Further, when carbon is contained in the first coating film, the content thereof is preferably 0.5 to 25 parts by weight. Thereby, it is possible to suppress the problem that the carbon particles are separated and detached from the first coating film, and the heat dissipation improving effect of the stability can be obtained.

Further, as the cerium oxide, for example, those having an average particle diameter of 0.1 to 100 μm can be used. Further, when the first coating film contains cerium oxide, the content thereof is preferably 0.5 to 200 parts by weight. As a result, it is possible to suppress the problem that the particles of cerium oxide are separated and detached from the first coating film, and to obtain a stable heat dissipation improving effect.

Further, as the alumina, for example, those having an average particle diameter of 0.1 to 100 μm can be used. Further, when the first coating film contains alumina In the case of the case, the content is preferably 0.5 to 200 parts by weight. Thereby, the problem that the particles of alumina are separated and peeled off from the first coating film can be suppressed, and the heat dissipation improving effect of stability can be obtained.

Further, as the zirconia, for example, those having an average particle diameter of 0.1 to 100 μm can be used. In the case where the first coating film contains zirconia, the content thereof is preferably 0.5 to 200 parts by weight. Thereby, the problem that the particles of zirconia are separated and detached from the first coating film can be suppressed, and the heat dissipation improving effect of stability can be obtained.

Further, the film thickness of the first coating film can be, for example, 0.5 to 100 μm.

Further, the second coating film may include a second base resin having a softening point of 150 ° C or less and comprising an acrylic resin, a urethane resin, an ionic polymer resin, and a poly One type or two or more types of an olefin resin, an epoxy resin, and a polyester resin (application 5). In this case, by setting the softening point to 150 ° C or lower, the heating performed when the subsequent function of the second coating film is exhibited can be performed at a relatively low temperature. The adjustment of the softening point can be easily performed by adjusting the number average molecular weight of each resin or the like. More preferably, the softening point of the second coating film is 140 ° C or lower. In addition, the lower limit of the softening point is preferably 50 ° C or more, and more preferably 70 ° C or more, from the viewpoint of suppressing the reaction when the precoated aluminum alloy sheet for a heat dissipating member is stored.

The polyolefin resin in the second coating film is the same as the first coating film, and for example, a polyethylene resin or a polypropylene resin can be used.

Further, the second coating film may be in the second base resin Contains a thermally conductive substance (Application 6). The heat conductive material is a material which is more excellent in thermal conductivity than the second base resin and which can improve the thermal conductivity of the entire second coating film. By including the above-mentioned thermally conductive material, the heat transfer efficiency of the second coating film from the other members can be improved, and the heat radiation member using the heat dissipating member made of the pre-coated aluminum alloy plate for the heat dissipating member can be obtained. Sexuality is further improved.

Further, the thermally conductive material may contain aluminum oxide, titanium oxide, cerium oxide, carbon or nickel (Application 7). These materials are excellent in thermal conductivity and are suitable as those contained in the above second coating film. Further, the aluminum oxide, titanium oxide, cerium oxide, carbon or nickel is preferably in the form of a pellet or a powder. The particle size or content of the substances is not particularly limited, and can be selected within a range that does not impair the coating properties of the second coating film. For example, the average particle diameter of alumina, titania, cerium oxide or nickel may be 0.1 to 100 μm, and the content may be 0.5 to 200 parts by weight with respect to 100 parts by weight of the second base resin. In addition, the average particle diameter of carbon may be 10 to 100 nm, and the content may be 0.5 to 25 parts by weight with respect to the weight portion of the second base resin 100.

In the case where the thermally conductive material contained in the second coating film is made of nickel, for example, a Ni spherical filler having an average particle diameter of 0.3 to 100 μm which is easily obtained can be selected and 0.2 to be provided. At least one of a squamous NI filler having a thickness of 5 μm and a long diameter of 2 to 50 μm.

Further, in the heat dissipating portion material precoated aluminum alloy sheet, if the softening point of the first coating film is Tm ₁ ° C and the softening point of the second coating film is Tm ₂ ° C, Tm ₁ -Tm ₂ ≧20 is ideal (application 8).

When Tm ₁ -Tm ₂ <20, when the second coating film is heated and melted or softened, it is difficult to melt or soften the second coating film without softening the first coating film. . More preferably, it is Tm ₁ -Tm ₂ ≧40, and more preferably, it is Tm ₁ -Tm ₂ ≧800.

Further, at least one of the first coating film and the second coating film may contain one or two kinds of inner waxes of carnauba wax, polyethylene, microcrystalline wax, and lanolin ( Application 9). As a result, the effect of improving the workability and the improvement of the adhesion resistance can be increased.

The content of the inner wax may be, for example, 0.05 to 3 parts by weight with respect to 100 parts by weight of each base resin. By selecting this range, the effect of improving the workability and the scratch resistance can be easily obtained, and the occurrence of a so-called agglomeration phenomenon in which the precoated aluminum alloy sheets are attached to each other and becomes inseparable can be suppressed. .

Further, the first coating film and the second coating film are preferably a coating type or a reactive type chromic acid-treated or non-chromic acid-treated layer formed on the surface of the aluminum alloy sheet. In this case, the adhesion between the aluminum alloy sheet and the precoat layer can be improved, and workability, durability, and the like can be further improved. Further, the first coating film and the second coating film may each be composed of only one layer, and another synthetic resin coating film may be disposed as a base coating film in the lower layer.

Further, in the first coating film and the second coating film, pigments and dyes may be added to enhance the design insofar as the properties such as heat dissipation, workability, and adhesion are not hindered. Sex.

Then, the heat dissipating member including the bottom surface portion and the fin portion formed by bending the pre-coated aluminum alloy sheet for the heat dissipating member is not limited to the embodiment described later, and may be used and Various shapes corresponding to the shape or function of other members to be applied. In addition, it is preferable that the pre-coated aluminum alloy plate for a heat radiating member used for the manufacture of a heat radiating member is only one piece, However, you may combine a plurality of pieces.

In addition, the fin portion may be formed by bending a pre-coated aluminum alloy plate for the heat dissipating member so that the first coating film is positioned on the surface, and is formed by two overlaps (application) 11). Specifically, for example, it is also shown in the second embodiment to be described later. Generally, one pre-coated aluminum alloy plate for a heat dissipating member can be used, and the bending of 90 degrees and the bending of 180 degrees are plural. In the second combination, the bottom portion and the fins formed by the two folded layers are alternately formed, and the bottom portions are arranged side by side so as to be slightly flush with each other.

Further, in the fin portion formed by the 180-degree bending, since the second coating films of the two layers are in contact with each other, the second coating layer is formed on the bottom surface portion. When the bonding surface formed by the film is heated by the other members, the second coating film at the fin portion is also melted or softened to function as a bonding function. Therefore, the two overlapping fin portions can be integrated, and the rigidity can be improved.

Moreover, the fin portion may be a precoated aluminum alloy for the heat dissipating member. The plate is formed by bending into a wave shape in a state in which it is not overlapped (application 12). Specifically, for example, in the first embodiment to be described later, a pre-coated aluminum alloy plate for a heat dissipating member can be used, and a 90-degree bending combination can be used in combination of plural times. The bottom portion and the fin portion formed by the one surface facing each other with the gap are formed in a zigzag shape, and the bottom surface portions are arranged side by side so as to be slightly flush with each other.

Further, in the above-described heat dissipating member having the bottom surface portion and the fin portion, when a plurality of fin portions are provided, the interval between the fins is preferably 5 mm or more in order to improve the air permeability. It is more ideal to set it to 8mm or more. When the interval between the fins is not uniform, it is preferable that the shortest interval is 5 mm or more as described above, and more preferably 8 mm or more.

Further, in the heat dissipating member having the bottom surface portion and the fin portion, the fin portion formed of the pre-coated aluminum alloy plate for the heat dissipating member may be formed in the thickness direction and penetrate the fin portion. Through hole. In this case, the air permeability of the heat dissipating member is improved, and the heat dissipation property can be further improved.

Further, in the heat dissipating member in which the pre-coated aluminum alloy plate for the heat dissipating member is bent into a wave shape in a state of not overlapping, the fin portion can be formed by the convex body The convex body is a rising surface that rises in a direction perpendicular to the vertical direction from the bottom surface portion, and a top surface that extends from the rising surface in a direction slightly parallel to the bottom surface portion, and from the top plate The face is lowered toward the bottom surface portion and is lowered slightly in the vertical direction Falling face, formed. The through hole may be formed in any one of a rising surface, a top surface, and a lower surface of the fin portion.

Further, in the heat dissipating member which is bent and formed in a wave shape along a plurality of bending starting line lines, one end side of the forming direction of the bending starting line may be used as a joint for joining other members. The joint end.

Specifically, it is preferable that the heat dissipating member has a configuration in which the entire shape of the bending starting line is aligned in a state in which the bending starting line is aligned in the axial direction. The joint end portion (application 14) is provided at one end of the cylindrical shape in the axial direction.

In this case, the surface area of the side surface of the heat dissipating member having a cylindrical shape can be increased, and the heat dissipation of the side surface can be improved. Moreover, since the space is formed in the inside of the cylindrical heat radiating member, the air cooling performance can be improved.

Further, in the heat dissipating member having the end portion formed at one end side of the forming direction of the bending starting line, when a plurality of fins are provided, the interval between the fins is to be ventilated. Sexual improvement is ideal for setting it to 3mm or more. When the interval between the fins is not uniform, it is preferable that the shortest interval is 3 mm or more as described above, and more preferably 5 mm or more.

It is preferable that the heat dissipating member has a cylindrical shape as a whole shape (Application 15).

In this case, the pre-coated aluminum alloy plate for the heat dissipating member is bent and formed into a corrugated shape along a plurality of bending starting line lines, and is formed into a cylindrical shape. Shaped heat sink. also, It is easy to apply to a heat dissipating member for a lighting fixture such as a lamp having a cylindrical shape.

Moreover, it is preferable that the heat dissipating member has a configuration in which a plurality of fins arranged in a radial shape are provided in the radial direction of the cylindrical shape, and the above-mentioned fins are adjacent to each other. The fins are alternately connected to each other on the inner circumferential side and the outer circumferential side of the cylindrical shape, and the connecting portions on the inner circumferential side and the outer circumferential side of the fin portions are arranged in the circle A plane in the circumferential direction of the cylinder shape or a curved surface is formed (application 16).

In this case, the surface area of the first coating film can be increased by the presence of the fin portion, and excellent heat dissipation properties can be obtained. Moreover, in the fin portion disposed in the radial direction and the joint portion disposed in the circumferential direction, a surface having excellent heat dissipation properties is formed. Therefore, it is possible to promote heat dissipation in multiple directions.

Further, it is preferable that a through hole is formed in the connecting portion (Application 17).

In this case, the air permeability of the cylindrical heat dissipating member can be improved.

The connecting portion on the inner peripheral side constitutes an inner surface portion of the cylindrical heat dissipating member, and the connecting portion on the outer peripheral side constitutes an outer surface portion of the cylindrical heat dissipating member. By forming the through holes as described above in the inner surface portion and the outer surface portion as described above, the air permeability of the side surface of the cylindrical heat dissipating member is improved as described above, and the air cooling performance can be further improved.

The through hole, specifically, the heat dissipating member constituting the heat dissipating member A through hole is formed in the thickness direction of the precoated aluminum alloy sheet. One or more of the through holes can be provided. Preferably, the through hole is provided in the connection portion on the outer peripheral side and/or the connection portion on the inner peripheral side.

Further, from the viewpoint of securing the heat dissipating surface at the joint portion, it is preferable that even when a through hole is formed in the joint portion, at least a portion or a curved surface remains at the joint portion. The part consisting of pre-coated aluminum alloy sheets.

The through-hole can be formed in the connecting portion by forming the connecting portion as a planar or curved surface as described above. However, the connecting portion may be formed by a line parallel to the axial direction of the cylindrical shape. It. In other words, the pre-coated aluminum alloy sheet which is bent into a zigzag shape may be configured to have a cylindrical heat dissipating member in a state in which a plurality of bending starting points are aligned in the axial direction. In this case, the connecting portion is not a flat surface or a curved surface, but has a linear shape parallel to the axial direction, and a protruding corner portion having an acute angle is formed at the connecting portion.

When the above-described first heat-dissipating member for the heat-dissipating member is formed on the back surface of the front and back surfaces, the first heat-dissipating member for the heat-dissipating member is formed, and the first heat-dissipating member is formed. The coating film may be disposed on either the outer peripheral side or the inner peripheral side of the tubular shape. The second coating film is also the same.

Preferably, the first coating film of the heat dissipating portion material precoated aluminum alloy sheet is located on the outer peripheral side of the cylindrical shape, and the second coating film is located on the inner peripheral side of the cylindrical shape (application) 18).

In this case, since it is easy to contact with the outside atmosphere Since the side of the first coating film having excellent heat dissipation properties is disposed on the side, the heat dissipation property can be further improved.

Further, in the heat dissipating member in which the entire body is bent into a cylindrical shape, one end of the cylindrical shape in the axial direction is a joint end portion to be joined to another member. When joining with another member, if one end of the heat dissipating member in the axial direction is disposed on another member and heated, the second coating film is at least partially melted or softened, and is melted or softened. The second coating film is spread over other members and hardened by standing cooling. In this case, when the second coating film is disposed on the inner peripheral side of the cylindrical shape as described above, the succeeding portion of the second coating film can be formed into a cylinder that is difficult to visually recognize from the outside. The inside of the shape. Therefore, it is possible to improve the aesthetics after joining.

[Examples] (Example 1)

An example of a heat sink member produced by using a precoated aluminum alloy sheet for a heat dissipating member is shown as an example of a downlight that is applied to one of the lighting fixtures. The heat radiating member 5 of the present embodiment is generally provided as shown in FIG. 2, and has a bottom surface portion 50 having a joint surface 51 for joining to other members (base member) 81 (FIG. 4), and a bottom surface portion 50. The fins 52 are set up.

The bottom surface portion 50 and the fin portion 52 are formed by bending the heat-dissipating member shown in FIG. 1 by the pre-coated aluminum alloy sheet 1. As shown in the figure, the pre-coated aluminum alloy plate 1 for the heat dissipating member is provided with an aluminum alloy plate. 10. The first coating film 11 formed on one of the faces of the first coating film 11 and the second coating film 12 formed on the other surface. The first coating film 11 is provided with a more excellent heat dissipation property than the surface of the aluminum alloy plate. The second coating film has a function of melting or softening by heating to form an adhesive. On the other hand, the joint surface 51 (FIG. 2) at the bottom surface portion 50 is formed by the surface including the second coating film 12.

The precoated aluminum alloy sheet 1 for the heat radiating member was produced as follows. First, as the aluminum alloy plate 10 which is a base material, a material of A1050-O material and a thickness of 0.5 mm is used. The both sides of the aluminum alloy plate 10 were degreased by an alkaline degreaser, and then immersed in a phosphoric acid chromate bath to carry out a chemical conversion treatment. The obtained chemical conversion film (chromate chromate film) 105 was contained in the range of 20 ± 5 mg/m ² as the Cr content in the film.

Next, on the one surface of the aluminum alloy plate 10, the first coating film 11 is formed. As the coating material, a polyester resin having a melting point of more than 200 ° C (softening point: 240 ° C) and a number average molecular weight of 16,000 is used as the first base resin, and in the solid content ratio, 100 weight relative to the first base resin is used. In the heat-dissipating material, the titanium oxide having an average particle diameter of 0.3 μm contains 100 parts by weight, and the polyethylene wax as the inner wax contains 1 part by weight. The coating was carried out using a bar coater, and the film thickness of the first coating film 11 was set to 50 μm. In addition, the baking conditions of the first coating film 11 were maintained in an oven at 240 ° C for 60 seconds so that the surface temperature became 230 ° C.

Next, on the other side of the aluminum alloy plate 10, a second coating is formed. Membrane 12. As a coating, it is used in a 40% aqueous solution of a bisphenol A type epoxy resin having a number average molecular weight of 10,000, and a blocked isocyanate: fixative #212 manufactured by Murakami Chemical Research Co., Ltd. (7:3). The proportion is made by the blender. The coating was carried out using a bar coater, and the film thickness of the second coating film 12 was set to 20 μm. In addition, the baking conditions of the second coating film 12 were maintained in an oven at 240 ° C for 60 seconds so that the surface temperature became 230 ° C. The obtained second coating film 12 had a melting point of 170 ° C and a softening point of 85 ° C. Further, when the first coating film 11 and the second coating film 12 are mass-produced, they can be coated using a continuous coating line.

Using the precoated aluminum alloy sheet 1 for a heat dissipating member thus obtained, the heat dissipating member 5 was generally produced as follows. First, the pre-coated aluminum alloy sheet 1 for the heat dissipating member is formed into a material (not shown) corresponding to the shape in which the heat dissipating member 5 having the final shape shown in FIGS. 2 and 3 is developed into a flat shape.

Next, as shown in FIG. 2 and FIG. 3, the material is repeatedly bent at 90 degrees to form a wave shape, and the bottom surface portion 50 which is arranged in a horizontally horizontal direction and the bottom surface portion 50 are provided. The fins 52 are provided. Further, the surface of the bottom surface portion 50 on the side opposite to the side on which the fin portion 52 is provided is the joint surface 51 and is a surface including the second coating film 12.

Moreover, as shown in FIG. 3, the heat radiating member 5 is formed in such a manner that the outline in a state of being viewed from above is rounded. Further, as shown in FIG. 2, each of the fin portions 52 is formed by only one pre-coated aluminum alloy plate, and the interval D1 between adjacent fin portions 52 is set. It is 8mm.

The obtained heat radiating member 5 can be used in a state of being integrally joined to other members by bringing the bottom surface portion 50 into contact with another member and heating it. As a specific configuration of the downlight 8 applied to one of the lighting fixtures, as shown in FIG. 4, the heat radiating member 5 can be joined to the base plate 81 as the other member. . It is also possible to regard the entire base member 81 and the heat radiating member 5 as a heat radiating member.

The base member 81 is made of a disc made of an aluminum alloy (having a diameter of 85 mm and a thickness of 3 mm). The joining between the base member 81 and the heat radiating member 5 is performed by placing the joint surface 51 of the bottom surface portion 50 of the heat radiating member 5 on the base member 81 and applying the substrate with a certain degree of load. The entire member 81 and the heat dissipating member 5 were heated to 170 ° C, and then left to stand and cooled. By the heating, the second coating film 12 of the pre-coated aluminum alloy sheet 1 for the heat dissipating member constituting the heat dissipating member 5 is melted or softened, and the second coating film 12 is cured by the subsequent cooling to exhibit the next function. Thereby, as shown in FIGS. 4 and 5, the base member 81 and the heat radiating member 5 are integrated. Further, when the second coating film 12 is melted or softened, there is a certain flow, and a portion 127 which is widened so as to cover the surface of the base member 81 is formed.

Further, as shown in the figure, in general, a combination of a substrate 83 on which a light source 82 made of an LED element is mounted and a reflector 84 for reflecting light emitted from the light source 82 in a desired direction are combined. The downlight body portion 80. Thereafter, the base member integrated with the heat dissipating member 5 81 is disposed on the substrate 83 of the downlight main body 80 and joined by an insulating film 85. Thereby, the lamp 8 having the heat radiating member 5 is completed.

When the backlight 8 is turned on, the light source 82 is heated. This heat is transmitted to the heat radiating member 5 through the substrate 83, the insulating film 85, and the base member 81. At the heat radiating member 5, the heat transmitted to the aluminum alloy plate 10 is efficiently dissipated by the action of the first coating film 11 having excellent heat dissipation properties. Therefore, it is possible to suppress an excessive rise in the temperature of the light source 82 at the downlights 8, and it is possible to prevent the deterioration of the life and the maintenance of the light-emitting performance.

(Example 2)

The heat radiating member 6 of this example is the same as that of the first embodiment and can be applied to a lighting fixture of a downlight type.

The heat radiating member 6 of the present embodiment is generally provided as shown in Fig. 6, and has a bottom surface portion 60 having a joint surface 61 for joining to other members (base member) 81 (Fig. 8), and a bottom surface portion 60. The fins 62 are set up.

The bottom surface portion 60 and the fin portion 62 are formed by bending a preheated aluminum alloy sheet 1 having the same configuration as that of the first embodiment. In the production of the heat dissipating member 6, first, the pre-coated aluminum alloy sheet 1 for the heat dissipating member is formed into a material corresponding to the flat shape of the heat dissipating member 6 having the final shape shown in FIGS. 6 and 7 ( Omit the illustration).

Next, as shown in FIG. 6 and FIG. 7, generally, the above materials are appropriate. The 90-degree bending and the 180-degree bending are repeatedly performed, and the bottom surface portion 60 which is arranged in a horizontally horizontal direction and the fin portion 62 which is provided from the bottom surface portion 60 are provided. Further, the surface of the bottom surface portion 60 on the side opposite to the side on which the fin portion 62 is provided is the joint surface 61 and is a surface including the second coating film 12.

Further, the heat radiating member 6 is generally formed as shown in Fig. 7 so that the contour in a state of being viewed from above is rounded. Further, as shown in FIG. 6, each of the fin portions 62 is formed by bending a 180 degree portion so that the first coating film 11 is placed on the surface of the heat-dissipating member for the heat-dissipating member. The overlap constitutes the person. Further, the interval D2 between the adjacent fin portions 62 is set to 8 mm.

The obtained heat radiating member 6 can be used in a state of being integrally joined to other members by bringing the bottom surface portion 60 into contact with other members and heating them. As a specific configuration of the downlight to be applied to the same configuration as that of the first embodiment, as shown in Fig. 8, the heat dissipating member 6 is joined to the base plate 81 as the other member. It is also possible to regard the entire base member 81 and the heat radiating member 6 as a heat radiating member.

The joining between the base member 81 and the heat radiating member 6 is performed by placing the joint surface 61 of the bottom surface portion 60 of the heat radiating member 6 on the base member 81 and applying the substrate to a certain degree of load. The entire member 81 and the heat dissipating member 6 were heated to 170 ° C, and then left to stand and cooled. By the heating, the second coating film 12 of the pre-coated aluminum alloy sheet 1 for the heat dissipating member constituting the heat dissipating member 6 is melted or softened, and the second coating film 12 is cured by the subsequent cooling to exhibit the function. Thereby, as shown in FIG. 9, generally, the base member 81 and the heat radiating member 6 are integrated, and the two overlapping parts of each fin part 62 are integrally joined.

Further, as shown in Fig. 8, a base member integrated with the heat radiating member 6 is interposed by the insulating film 85 by the downlight main body portion 80 which is separately prepared in the same manner as in the first embodiment. 81 is engaged to complete the downlight 802.

Also in this example, the heat emitted from the light source 82 when the downlight 802 is turned on is transmitted to the heat radiating member 6 through the substrate 83, the insulating film 85, and the base member 81. At the heat radiating member 6, the heat transmitted to the aluminum alloy plate 10 is efficiently radiated by the action of the first coating film 11 having excellent heat dissipation properties. Therefore, it is possible to suppress an excessive rise in the temperature of the light source 82 at the downlight 802, and it is possible to prevent the decrease in the life and the maintenance of the light-emitting performance.

Further, in the heat dissipating member 6 of the present embodiment, since the fin portion 62 has two overlapping structures as shown in Fig. 9, the rigidity of the fin portion 62 is higher than that in the first embodiment. Further, the area of the joint surface 61 of the bottom portion 60 is also larger than that in the first embodiment, and therefore the joint stability is also high.

Further, in the first and second embodiments, the shape of the heat radiating members 5 and 6 is circular, but it may of course be changed to a square shape, an octagonal shape or the like, and the area of the base member 81 may be changed. Change the shape inside.

(Comparative Example 1)

As shown in Fig. 10, in order to quantitatively evaluate the effectiveness of the heat dissipating members of the above-described Embodiments 1 and 2, as a comparative example, it is prepared to make the base member 81 and the heat dissipating member 5 or 6 as described above. The integrated part is changed to a cast heat sink member 95 under the aluminum alloy of the material ADC12.

<Evaluation>

As the evaluation test, the headlights 8 (Example 1), the downlight 802 (Example 2), and the downlight 809 (Comparative Example 1) were prepared as the test materials 1, 2, and 3, and These were respectively placed in a constant temperature chamber at an ambient temperature of 25 ° C, and a test was performed for measuring the temperature of each portion at the time point after lighting for 1 hour. Moreover, in order to measure the temperature stably, the test materials 1, 2, and 3 were placed in a vinyl chloride-made corner cylinder (not shown) and turned on. The temperature measurement position is generally shown in FIG. 4, FIG. 8, and FIG. 10, and is point A (substrate outer peripheral end), point B (base portion outer peripheral end), point C (lower heat radiating member lower portion), and D point (heat radiating member). Six places of the upper part, the E point (the lower part of the corner tube), and the F point (the upper part of the corner tube).

Moreover, the weight of the heat radiating member in each test material was measured. The weight of the heat radiating members 5, 6 of Examples 1 and 2 does not include the weight of the base member 81.

In Table 1, the results of the temperature measurement and the weight of the heat dissipating member are shown. Further, in Fig. 11, the measurement results of the above point A are made. Show. In the figure, the type of the measurement target material is displayed on the horizontal axis, and the temperature of the point A is displayed on the left vertical axis, and the weight of the heat dissipation member is displayed on the right vertical axis, and the temperature of the point A is displayed as a bar graph, and The weight of the heat dissipating member is shown by a dot (○).

As can be seen from Table 1 and FIG. 11, in general, the weight of the heat dissipating member 5 of the first embodiment and the heat dissipating member 6 of the second embodiment is lighter than that of the prior art casting heat dissipating member 95, and the heat dissipating effect is More improved.

(Examples 3 to 11)

In the first and second embodiments described above, an example of a precoated aluminum alloy sheet for a heat dissipating member in which a first coating film and a second coating film having a specific composition are formed is shown. However, this example is An example of a precoated aluminum alloy sheet for a heat dissipating member in which a first coating film having a composition different from those of Examples 1 and 2 and a second coating film are formed.

The composition of the first coating film and the second coating film formed in this example is They are shown in Table 2 and Table 3 which will be described later. In the examples 3 to 11, the precoated aluminum alloy sheet for a heat dissipating member having the same configuration as that of the first embodiment was used except that the first coating film and the second coating film were different. The specific method of forming the first coating film and the second coating film is the same as in the first embodiment.

In addition, in Table 2 and Table 3, as the titanium oxide, an average particle diameter of 0.3 μm is used, and as the carbon black, an average particle diameter of 24 nm is used, and as the alumina filler, an average particle diameter of 4 μm is used.

In addition, in the acrylic resin of the second base resin, "JURYMER AT613" manufactured by Toagosei Co., Ltd. is used as the urethane resin, which is manufactured by Mitsui Chemicals Co., Ltd. "TAKELAC W615", which is a polyester resin, uses "PES375S40" manufactured by Toagosei Co., Ltd. as a blocked isocyanate, and is used as a "fixing agent #212" manufactured by Murayama Chemical Research Institute. .

Further, in Table 2, the emissivity (%) and the softening point Tm ₁ (°C) of the first coating film are shown.

The emissivity of the first coating film can be measured by the integrated emissivity of infrared rays. In addition, the emissivity of the aluminum alloy plate (material A1050-O material, thickness 0.5 mm) in this example was 15%.

Further, in Table 3, the softening point Tm ₂ (° C.) and the peel strength (kg/0.5 cm ² ) of the second coating film were displayed.

The peeling strength of the second coating film was measured in accordance with JIS-K6854-3 "Adhesive-peeling strength test method: T-type peeling".

Specifically, first, the aluminum alloy sheet on which the second coating film is formed is cut. Broken to 10mm width × 100mm length. Thereafter, the coated surface of the second coating film on which the aluminum alloy sheet of the second coating film is formed and the uncoated aluminum alloy sheet are superposed so that the joint surface becomes a length of 50 mm, and the metal clip is used. And fixed. Next, heating was carried out for 20 minutes at a temperature of 150 °C. The measurement was carried out by a tensile test at a tensile speed of 50 mm/min by a tensile tester, and the peel strength at this time was measured. The test temperature was set to 25 °C.

Further, the softening points Tm ₁ and Tm ₂ in Table 2 and Table 3 were based on the Fica softening temperature (VST) test method of the plastic-thermoplastic plastic specified in JIS-K7206 (1999). Determination.

Then, the first coating film and the second coating film shown in Tables 2 and 3 were formed by the combination shown in Table 4, and nine types of precoated aluminum alloy sheets for heat dissipating members were produced ( Examples 3 to 11). The specific method of forming the first coating film and the second coating film is the same as in the first embodiment.

Next, a wave-shaped heat dissipating member was produced in the same manner as in Example 1 except that the pre-coated aluminum alloy sheets for the heat dissipating members were used. Thereafter, using these heat dissipating members, the downlights were constructed in the same manner as in the first embodiment, and the downlights were respectively placed in a constant temperature chamber at an ambient temperature of 25 ° C, and were the same as the evaluation test described above. The temperature at the outer peripheral end of the substrate (point A) at the time point after the lighting for 1 hour was measured. The results are shown in Table 4. Further, in Table 4, the results of Comparative Example 1 are collectively described for comparison. Further, in Table 4, the difference (Tm _{1 -} Tm ₂ ) between the softening points of the first coating film and the second coating film is shown.

As can be seen from Table 4, the heat dissipating members using the precoated aluminum alloy sheets of Examples 3 to 11 can exhibit excellent heat dissipation effects compared to the cast heat dissipating members of the prior art (Comparative Example 1). . Further, as shown in Table 3, the precoated aluminum alloy sheets of Examples 3 to 11 were provided with a second coating film which was excellent in peel strength. Therefore, when used as a heat dissipating member, it can be adhered to other members such as a base member of a downlight with excellent adhesion.

Further, in this example, the wave-shaped heat dissipating members similar to those in the first embodiment were produced by using the precoated aluminum alloy sheets for heat dissipating members of Examples 3 to 11, but they were also produced in the same manner as in the second embodiment. Two heat dissipating members that are overlapped.

(Embodiment 12)

This example is an example of a heat dissipating member having a shape different from that of the first and second embodiments. The heat dissipating member 7 of the present embodiment is the same as those of the first and second embodiments and can be applied to a lighting fixture of a downlight type (refer to Fig. 12).

In the heat dissipating member 7 of this example, as shown in Figs. 12 to 14, the pre-coated aluminum alloy sheet 1 for the heat dissipating member is bent along a plurality of bending starting points 71 and formed into a wave shape. The heat radiating member 7 is provided at one end side 715 of the direction in which the bending starting line 71 is formed, and has an engaging end portion 72 that is joined to the other member 81. The heat dissipating member 7 has a cylindrical shape in a state in which the bending starting line 71 is aligned in the axial direction X, and is provided at one end 715 of the axial direction X of the cylindrical shape. There is a joint end 72. The heat radiating member 7 can be used by joining the joint end portion 72 to the other member 81.

The heat radiating member 7 is provided with a plurality of fins 73 that are arranged in a radial direction in the radial direction of the cylindrical shape. In the heat radiating member 7, the adjacent fins 73 are alternately connected to each other at the inner circumferential side 701 and the outer circumferential side 702 of the cylindrical shape. The connecting portions 74 and 75 of the inner peripheral side 701 and the outer peripheral side 702 of the fin portions 73 are formed by being arranged on a plane in the circumferential direction of the cylindrical shape. Hereinafter, the connecting portion of the inner circumferential side 701 is referred to as an inner surface portion 74 as appropriate, and the connecting portion of the outer circumferential side 702 is referred to as an outer surface portion 75.

As shown in FIG. 13, generally, in this example, the intervals between the adjacent fins 73 are different from each other in the radial direction, and the interval is increased from the inner peripheral side 701 toward the outer peripheral side 702. . Adjacent fins 73 between each other The partition is the smallest at the inner peripheral side 701. In this example, the interval D3, D4 of the inner peripheral side 701 is set to be the same either at the portion where the inner surface portion 74 of the joint portion of the inner peripheral side 701 is present or where it does not exist. , and both are 5mm. That is, the interval between the fin portions 73 on the inner peripheral side 701 is all uniform and becomes 5 mm.

Further, the interval between the adjacent outer peripheral sides 702 of the fin portions 73 is also uniform regardless of whether or not the outer surface portion 75 of the connecting portion of the outer peripheral side 702 is present, and is uniformly set in this example. 8mm.

Further, in this example, the interval between the inner peripheral sides 701 of the adjacent fin portions 73 and the interval between the outer peripheral sides 702 are uniform, respectively, but the interval may be changed. From the viewpoint of heat dissipation, the shortest interval between the adjacent fin portions 73 is preferably set to 3 mm or more.

Further, as shown in FIG. 12 and FIG. 14, in the joint portion, that is, at the flat inner surface portion 74 and the outer surface portion 75, the pre-coated aluminum alloy sheets constituting the heat radiating member 7 are respectively formed in the thickness. Through holes 740, 750 are formed in the direction. In this example, through holes 740 and 750 are provided in all of the inner surface portion 74 and the outer surface portion 75. Further, a through hole may be formed in the fin portion 73. In the inner surface portion 74, two through holes 740a and 740b which are arranged in series in the axial direction X of the cylindrical shape are disposed. Similarly, the outer surface portion 75 is also provided with two through holes 750a and 750b which are arranged in series in the axial direction X. Between the through holes 740a, 740b, 750a, and 750b, the portion composed of the precoated aluminum alloy sheet 1 remains.

The heat dissipating member 7 is formed by bending one precoated aluminum alloy sheet 1 into The wave shape is formed by bending the entire shape into a cylindrical shape in a state in which the bending starting point lines are aligned in the axial direction. As the precoated aluminum alloy sheet 1, the precoated aluminum alloy sheet 1 for the heat radiating member shown in the first embodiment was used. Therefore, the heat radiating member 7 is generally provided with an aluminum alloy plate 10 and a first coating film 11 formed on one of the faces of the aluminum alloy plate 10, and is formed on the other surface. The second coating film 12. Further, of course, the heat dissipating members having the same configuration as that of the present embodiment can be formed by using the precoated aluminum alloy sheets for heat dissipating members of the above-described Examples 3 to 11.

In the formation of the heat dissipating member 7 of the present embodiment, first, a precoated aluminum alloy sheet 1 (material) for a heat dissipating member having the same configuration as that of the first embodiment is prepared, and thereafter, the precoated aluminum alloy sheet 1 is not overlapped. In the state of one piece, it is bent into a wave shape along the bending starting line 71 of the plural number. Next, in the precoated aluminum alloy sheet 1 which is bent into a wave shape, through holes 740 and 750 are formed in advance at the portions of the joint portions 74 and 75 which are final shapes (refer to FIGS. 12 to 14). Next, in a state in which the bending starting line 71 is aligned in the axial direction X, the entire shape is bent into a cylindrical shape (diameter: 85 mm, height: 5 cm). At this time, the end portions in the circumferential direction can be joined by using an adhesive or the like. In addition, in the state in which the entire shape is bent into a cylindrical shape, the second coating film of the pre-coated aluminum alloy sheet 1 for heat dissipation member can be softened or melted by heating, and then hardened by standing cooling. And the overall shape is fixed to a cylindrical shape.

In this example, as shown in FIG. 15, the first coating film 11 of the precoated aluminum alloy sheet 1 for a heat radiating member is formed into a cylindrical outer peripheral side. In 702, the second coating film 12 is formed into a cylindrical inner circumferential side 701. In addition, in FIGS. 12 to 14 and FIG. 16 which will be described later, the first coating film and the second coating film are omitted for convenience of drawing, but actually, as shown in FIG. Generally, the first coating film 11 and the second coating film 12 are formed on the surface of the aluminum alloy plate 10, respectively.

As shown in FIGS. 12 to 14, generally, the cylindrical heat dissipating member 7 can have one end of the axial direction X as the joint end portion 72 with respect to the other members 81. By heating the joint end portion 72 of the heat radiating member 7 in contact with the other member 81, it can be used in a state of being integrally joined to the other member 81. As a specific configuration of a downlight suitable for use as one of the lighting fixtures, as shown in FIG. 16, a configuration in which the heat radiating member 7 is joined to the base plate 81 as the other member can be employed. . It is also possible to regard the entire base member 81 and the heat radiating member 7 as a heat radiating member. In addition, in Fig. 16, the heat radiating member 7 disposed on the headlight main body portion 80 is shown in Fig. 13 and is shown in the A-A line arrow direction cross-sectional view.

The base member 81 is made of a disc made of an aluminum alloy (having a diameter of 85 mm and a thickness of 3 mm), and the joint between the base member 81 and the heat radiating member 7 is 85 mm in diameter and 5 cm in height by the base member 81. The cylindrical heat dissipating member 7 is placed such that one end (joining end portion 72) of the axial direction X is placed in contact with each other, and a certain degree of load is applied thereto. Example 1 is heated and placed in the same manner. Set it to cool and proceed. As shown in Fig. 17, in general, the second coating film 12 of the pre-coated aluminum alloy sheet 1 for the heat dissipating member constituting the heat dissipating member 7 is melted or softened by heating, and is expanded on the other member 81 by its own weight. wide. The second coating film 12 is cured by the subsequent cooling, and functions as a function of the next. Thereby, as shown in FIGS. 16 and 17, the base member 81 and the heat radiating member 7 are integrated. In addition, after the integration, the surface of the base member 81 is covered, and a portion 127 in which the constituent components of the second coating film are expanded is formed (refer to FIG. 17).

Further, as shown in FIG. 16, generally, the base member 81 integrated with the heat radiating member 7 is formed by the insulating film 85 in the same manner as in the first embodiment. The bonding is performed, whereby the backlight 803 provided with the heat dissipating member 7 is completed.

When the downlight 803 is turned on, the light source 82 is heated. This heat is transmitted to the heat radiating member 7 through the substrate 83, the insulating film 85, and the base member 81. At the heat radiating member 7, the heat transmitted to the aluminum alloy plate 10 is efficiently radiated by the action of the first coating film 11 having excellent heat dissipation properties. Therefore, it is possible to suppress an excessive rise in the temperature of the light source 82 at the downlight 803, and it is possible to prevent the deterioration of the life and the maintenance of the luminescent performance.

Further, the heat dissipating member 7 of the present embodiment is provided at one end side in the direction in which the bending starting line is formed, and has a joint end portion 72 for joining to another member. Therefore, the surface area of the cylindrical side surface can be increased, and the heat dissipation of the side surface can be improved.

Further, at the heat radiating member 7, the fin portions 73 are on the inner peripheral side 701 of each other The connecting portions 74 and 75 of the outer peripheral side 702 are formed by a plane or a curved surface disposed in the circumferential direction of the cylindrical shape. Further, through holes 740 and 750 are formed in the joint portions 74 and 75. Therefore, the air permeability of the side surface of the cylindrical heat dissipating member 7 can be improved. Therefore, it is able to exert excellent heat dissipation performance. The other operational effects of the heat dissipating member 7 of this example are the same as those of the first embodiment.

1‧‧‧Pre-coated aluminum alloy plate for heat dissipation components

10‧‧‧Aluminum alloy plate

11‧‧‧1st coating film

115‧‧‧Heat-dissipating substances

12‧‧‧2nd film

125‧‧‧Hot conductive substances

5, 6, 7‧‧‧ Heat-dissipating components

50, 60‧‧‧ bottom part

51, 61‧‧‧ joint surface

52, 62, 73‧‧‧ Fin

8, 802, 803, 809‧‧‧ downlights

80‧‧‧downlight body

81‧‧‧Base member

Fig. 1 is an explanatory view showing a configuration of a precoated aluminum alloy sheet for a heat dissipating member in the first embodiment.

Fig. 2 is an explanatory view showing a bent shape of a fin portion and a bottom surface portion of the heat dissipating member in the first embodiment.

3 is an explanatory view showing a state in which the bottom surface portion of the heat dissipating member is viewed from the opposite side in the first embodiment.

Fig. 4 is an explanatory view showing a configuration of a downlight in which a heat dissipating member is mounted in the first embodiment.

Fig. 5 is an explanatory view showing a heat dissipating member in a state of being followed by another member in the first embodiment.

Fig. 6 is an explanatory view showing a bent shape of a fin portion and a bottom surface portion of the heat dissipating member in the second embodiment.

FIG. 7 is an explanatory view showing a state in which the bottom surface portion of the heat dissipating member is viewed from the second embodiment.

Fig. 8 is an explanatory view showing a configuration of a downlight in which a heat dissipating member is mounted in the second embodiment.

Fig. 9 is an explanatory view showing a heat dissipating member in a state of being followed by another member in the second embodiment.

FIG. 10 is an explanatory view showing a configuration of a downlight in which a heat dissipating member is mounted in Comparative Example 1. FIG.

Fig. 11 is an explanatory view showing the evaluation results of Examples 1, 2 and Comparative Example 1.

Fig. 12 is a perspective view of a heat dissipating member to which a base plate is bonded in the twelfth embodiment.

Fig. 13 is a top view of a heat dissipating member to which a base plate is bonded in the twelfth embodiment.

Fig. 14 is a side view showing a heat dissipating member to which a base plate is bonded in the twelfth embodiment.

Fig. 15 is an enlarged explanatory view showing a partial cross section of a cylindrical heat dissipating member in the radial direction in the embodiment 12.

Fig. 16 is an explanatory view showing a configuration of a downlight in which a heat dissipating member is mounted in the twelfth embodiment.

Fig. 17 is an explanatory view showing a heat dissipating member in a state in which it is attached to another member in the twelfth embodiment in a cross-sectional structure.

1‧‧‧Pre-coated aluminum alloy plate for heat dissipation components

10‧‧‧Aluminum alloy plate

11‧‧‧1st coating film

12‧‧‧2nd film

5‧‧‧heating components

50‧‧‧ bottom part

51‧‧‧ joint surface

52‧‧‧Fin

Claims (18)

A precoated aluminum alloy plate for a heat dissipating member, comprising: an aluminum alloy plate; and a first coating film formed on one surface thereof and a second coating film formed on the other surface thereof, the heat dissipating member The precoated aluminum alloy sheet is characterized in that the first coating film is provided with more excellent heat dissipation properties than the surface of the aluminum alloy sheet, and the second coating film is provided with melting or softening by heating. And become the next function of the adhesive. The precoated aluminum alloy sheet for a heat dissipating member according to the first aspect of the invention, wherein the first coating film has a softening point of more than 150 ° C and a number average molecular weight of 10,000 Å from the fluorocarbon resin. 4000 urethane resin, a olefin resin having a number average molecular weight of 10,000 to 40000, an epoxy resin having a number average molecular weight of 1,000 to 15,000, and at least one selected from the group consisting of polyester resins having a number average molecular weight of 10,000 to 40000 The first base resin contains a heat-dissipating substance. The precoated aluminum alloy sheet for a heat radiating member according to the second aspect of the invention, wherein the first coating film contains titanium oxide, carbon, cerium oxide, aluminum oxide, or zirconium oxide as the heat dissipating material. One or two or more. The precoated aluminum alloy sheet for a heat dissipating member according to the second or third aspect of the invention, wherein the first coating film contains the average particle from the weight portion of the first base resin 100. 0.1~100μm titanium oxide 0.5~200 weight, micro powder carbon 0.5~25 weight At least one selected from the group of parts, 0.5 to 200 parts by weight of yttrium oxide, 0.5 to 200 parts by weight of alumina, and 0.5 to 200 parts by weight of zirconia. The precoated aluminum alloy sheet for a heat dissipating member according to any one of claims 1 to 4, wherein the second coating film contains a second base resin, and the second base resin softens The dot system is 150° C. or less, and is one or more selected from the group consisting of an acrylic resin, a urethane resin, an ionic polymer resin, a polyolefin resin, an epoxy resin, and a polyester resin. The precoated aluminum alloy sheet for a heat radiating member according to the fifth aspect of the invention, wherein the second coating film contains a thermally conductive material in the second base resin. The precoated aluminum alloy sheet for a heat dissipating member according to claim 6, wherein the thermally conductive material contains aluminum oxide, titanium oxide, cerium oxide, carbon or nickel. The precoated aluminum alloy sheet for a heat dissipating member according to any one of claims 1 to 3, wherein the second coating film is formed by setting a softening point of the first coating film to Tm ₁ °C. When the softening point is Tm ₂ °C, it is Tm ₁ -Tm ₂ ≧20. The precoated aluminum alloy sheet for a heat radiating member according to any one of the first to third aspect of the invention, wherein at least one of the first coating film and the second coating film includes Brazil. One or two internal waxes of palm wax, polyethylene, microcrystalline wax, and lanolin. A heat dissipating member is provided with: for bonding to other a bottom surface portion of the joint surface of the member and a fin portion that is erected from the bottom surface portion, wherein the heat sink member is characterized in that: the bottom surface portion and the fin portion are as claimed in claims 1 to 9 The heat dissipating member described in any one of the heat dissipating members is formed by bending a precoated aluminum alloy sheet, and the joint surface of the bottom surface portion is formed by a surface including the second coating film. The heat dissipating member according to claim 10, wherein the fin portion is formed by bending a pre-coated aluminum alloy plate for the heat dissipating member so that the first coating film is positioned on a surface thereof. It is composed of two overlapping pieces. The heat dissipating member according to claim 10, wherein the fin portion is formed by bending a precoated aluminum alloy sheet for the heat dissipating member in a state of being unfolded The composition of the shape. A heat dissipating member is formed by bending a pre-coated aluminum alloy sheet for a heat dissipating member according to any one of claims 1 to 9 along a plurality of bending starting points and forming a wave shape. The heat dissipating member is characterized in that the one end side of the forming direction of the bending starting line is provided with a joint end portion for bonding to another member. The heat dissipating member according to claim 13, wherein the heat dissipating member has a cylindrical shape in a state in which the bending starting line is aligned in the axial direction, and the cylindrical shape is in the cylindrical shape. It One of the joint ends is provided at one end of the axial direction. The heat dissipating member according to claim 14, wherein the heat dissipating member has a cylindrical shape as a whole. The heat dissipating member according to claim 15, wherein in the radial direction of the cylindrical shape, a plurality of fin portions arranged in a radial shape are provided, and the fin portions adjacent to each other are attached to the above-mentioned fin portion. The inner circumferential side and the outer circumferential side of the cylindrical shape are alternately connected to each other, and the inner peripheral side and the outer peripheral side connecting portion of the fin portions are arranged in the circumferential direction of the cylindrical shape. The plane is formed by a curved surface. The heat radiating member according to claim 16, wherein the connecting portion is formed with a through hole. The heat-dissipating member according to any one of the first aspect of the invention, wherein the first coating film of the pre-coated aluminum alloy plate for a heat dissipating member is an outer peripheral side of the cylindrical shape, and the first The coating film is the inner peripheral side of the above cylindrical shape.