JP2012230824A - Lighting system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lighting system of superb radiation efficiency equipped with a base and a heat sink mounting a light source part.SOLUTION: The lighting system is provided with a cover 10, a heat sink 20 mounting an LED module 60 on a loading face 21, an insulating part 30, a base 40, a lens part 50 arranged inside the cover 10, and a power supply part 70 arranged inside the insulating part 30 for supplying power to the LED module 60, among others. The insulating part 30, of a cylindrical shape with its cover 10 side closed and a base 40 side open, is inscribed in the heat sink 20. The insulating part 30 is of high thermally conductive properties and insulates the base 40 from the heat sink 20.

Description

  The present invention relates to a lighting device including a base and a heat sink on which a light source unit is mounted.

  Conventionally, with the increase in luminance of light emitting diodes (LEDs), instead of light sources such as incandescent bulbs and fluorescent lamps, LEDs having characteristics such as low power consumption and long life have come to be used as lighting sources in lighting devices and the like. For example, a bulb-type LED lamp is used instead of an incandescent bulb.

  For example, a base is provided at one end via an insulating ring, a heat radiating part that spreads in a trumpet shape toward the opening at the other end, a translucent cover attached to the opening of the heat radiating part, and the inside of the heat radiating part An LED bulb including a metal substrate on which a provided LED element is mounted is disclosed (see Patent Document 1).

Japanese Patent Laid-Open No. 2001-243809

  In the LED bulb of Patent Document 1, the heat generated in the LED element is conducted through the metal substrate and radiated from the heat radiating portion to the outside. When the heat radiating portion can be made large, heat generated by the LED element can be radiated from the heat radiating portion to the outside. On the other hand, there is a demand to reduce the size and weight of the LED bulb, but in the conventional heat dissipation structure, the heat generated from the LED element as the light source is only radiated by the heat dissipation portion, so when the heat dissipation portion is reduced in size, A sufficient heat radiation area cannot be obtained, and the heat from the LED element cannot be sufficiently radiated. For this reason, the illuminating device with better heat dissipation efficiency is desired.

  This invention is made | formed in view of such a situation, and it aims at providing the illuminating device with sufficient heat dissipation efficiency.

  The illumination device according to the present invention includes a base, a heat sink on which a light source is mounted, and an insulating portion that has high thermal conductivity and insulates the base and the heat sink.

  The present invention includes a base, a heat sink on which the light source is mounted, and an insulating portion that has high thermal conductivity and insulates the base and the heat sink. The high thermal conductivity of the insulating part means that the thermal conductivity of the insulating part is, for example, in a range of about 1 W / (m · K) to several tens W / (m · K). If it is about 3 W / (m · K), the required heat dissipation efficiency can be obtained. That is, the heat generated in the light source part is not only radiated from the heat sink, but also radiated from the base via the heat sink and the highly heat-conductive insulating part, so that the heat radiation efficiency can be improved. Further, since the heat is radiated from the base, the heat sink can be reduced in size and weight.

  In the lighting device according to the present invention, the insulating part is a synthetic resin molded product including a thermally conductive filler, and has a flow direction of the synthetic resin from the light source part side to the base side of the insulating part. It is characterized by.

  In the present invention, the insulating portion is a synthetic resin molded product including a thermally conductive filler, and has a flow direction of the synthetic resin from the light source portion side to the base side of the insulating portion. For example, carbon (carbon), graphite (graphite), alumina, iron powder, silicon nitride, or the like can be used as the thermally conductive filler, but it is not limited thereto. The flow direction of the synthetic resin means the direction in which the uncured synthetic resin flows in the injection mold when the insulating portion is formed by injection molding. In addition, the above-mentioned flow direction shall also include the direction along the light source part side from the nozzle | cap | die side of the insulation part. That is, the insulating part is injection-molded by flowing a synthetic resin before curing from the light source part side along the base side (or from the base side to the light source part side). Since the thermally conductive filler tends to be oriented along the flow direction, the thermal conductivity increases along the flow direction. As a result, the heat conductivity increases from the light source part side of the insulating part (that is, the place where the light source part is provided) toward the base side (ie where the base is provided). Can be conducted efficiently.

  In the lighting device according to the present invention, the heat sink and the insulating part are both in a cylindrical shape in which one side end of the light source part side is closed, and the one side end and a part of the side wall of the insulating part are inside the heat sink. It is in contact with each other.

  In the present invention, the heat sink and the insulating part are both in a cylindrical shape with one side end on the light source part side closed, and one side end of the insulating part and a part of the side wall are inscribed in the heat sink. A light source part is attached to one side end of the cylindrical heat sink. Since a part of the insulating part (one side end and a part of the side wall) is inscribed in the heat sink, the contact area between the insulating part and the heat sink increases, and the heat from the light source part also flows from the heat sink to the insulating part. Since it becomes easy to conduct, heat can be easily conducted to the die, and the heat radiation efficiency can be further improved.

  In the lighting device according to the present invention, the insulating unit houses a power supply unit that supplies power to the light source unit, and the thermal conductivity in the flow direction is higher than the thermal conductivity in the thickness direction of the insulating unit. It is characterized by that.

  In the present invention, the insulating part accommodates a power supply part that supplies electric power to the light source part, and the thermal conductivity in the flow direction is higher than the thermal conductivity in the thickness direction of the insulating part. By making the heat conductivity in the flow direction of the insulation part higher than the heat conductivity in the thickness direction perpendicular to the flow direction, the heat conducted through the insulation part is conducted toward the base and toward the power supply part. Thus, the temperature rise of the power supply unit can be suppressed. In order to make the thermal conductivity in the flow direction higher than the thermal conductivity in the thickness direction of the insulating part, the orientation of the thermal conductive filler should be aligned in the flow direction, or the scale-like or flat thermal conductive filler This can be realized by giving thermal conductivity anisotropy.

  The illumination device according to the present invention is characterized in that the other end side of the insulating portion is exposed from the heat sink, and the base is screwed to the other end side.

  In the present invention, the base is screwed to the other end of the insulating part exposed from the heat sink. As a result, heat is easily conducted from the insulating portion to the base, so that the heat dissipation efficiency can be further improved.

  According to the present invention, heat is also radiated from the base, so that the heat radiation efficiency can be improved.

It is an external view which shows an example of the external appearance of the illuminating device of this Embodiment. It is a principal part disassembled perspective view of the illuminating device of this Embodiment. It is an external appearance perspective view which shows the state which engaged the cover and insulating part of this Embodiment. It is an external view which shows an example of a structure of the protrusion of the cover of this Embodiment. It is an external view which shows an example of a structure of the notch part of the insulation part of this Embodiment. It is principal part sectional drawing which shows an example of the engagement state of the engagement mechanism of this Embodiment. It is principal part sectional drawing which shows the other example of the engagement state of the engagement mechanism of this Embodiment. It is principal part sectional drawing which shows an example of a structure of the illuminating device of this Embodiment.

  Hereinafter, the present invention will be described with reference to the drawings illustrating embodiments thereof. FIG. 1 is an external view showing an example of the external appearance of the illumination device 100 according to the present embodiment, and FIG. 2 is an exploded perspective view of a main part of the illumination device 100 according to the present embodiment. The illuminating device 100 is an illuminating device that can be used in place of, for example, an incandescent bulb such as 40 W or 60 W.

  As shown in FIG. 1, a lighting device 100 includes a base 40 that is fitted in an external socket and is electrically connected to a commercial power source, and a hollow (cylindrical) metal that dissipates heat generated in a light source unit described later. A heat sink 20 made of aluminum (for example, aluminum), a cylindrical insulating portion 30 that connects the base 40 and the heat sink 20 and electrically insulates the two, and a cylindrical cover that is attached to the heat sink 20 and covers the light source portion 10 and the like. Further, the main body 80 is constituted by the heat sink 20 and the insulating portion 30. That is, the light source unit and the cover 10 described later are attached to the main body unit 80.

  As shown in FIG. 1, the cover 10, the heat sink 20, the insulating portion 30, and the base 40 each have substantially the same outer diameter, and the outer diameter of the heat sink 20 is smaller than that of a conventional bulb-type shape. ing. The length of the heat sink 20 is also approximately the same as or slightly longer than the length of the base 40 and is shorter than the conventional heat sink. Note that the shapes of the cover 10, the heat sink 20, the insulating portion 30, and the base 40 are merely examples, and are not limited to the example of FIG. 1.

  More specifically, as illustrated in FIG. 2, the lighting device 100 includes a cover 10, a heat sink 20, an insulating unit 30, a base 40, a lens unit 50 disposed inside the cover 10, and a light source unit. The LED module 60 includes a power supply unit 70 that is disposed inside the insulating unit 30 and supplies power to the LED module 60. The insulating unit 30 functions as a housing unit that houses the power supply unit 70. The insulating unit 30 that houses the power supply unit 70 may be integrated with the heat sink 20, and the power supply unit 70 may be housed in the heat sink 20 instead of the insulating unit 30. In addition, a part of the power supply unit 70 can be arranged inside the base 40 according to the shape of the power supply unit 70 and the like.

  The cover 10 has a hollow cylindrical shape with one end opened. Two protrusions 11 as an engagement mechanism for attaching the cover 10 to the insulating portion 30 (main body portion 80) are provided on the peripheral end portion of the cover 10 in pairs. In addition, the number of the protrusions 11 is not limited to two. Details of the protrusion 11 will be described later.

  The cover 10 is made of glass, for example, and has translucency. By using the glass cover 10, not only can the color change due to heat generation be suppressed as compared with the synthetic resin cover, but also the lighting device 100 can have a high-class feeling and is excellent in appearance design. Has an open surface. The cover 10 is not limited to glass but may be made of synthetic resin such as acrylic or polycarbonate. By using a synthetic resin, the weight can be reduced.

  The lens unit 50 includes a substantially cylindrical lens 51 that transmits and reflects light from the LED module 60, and a disk-shaped fixing unit 52 that fixes the lens 51 to the mounting surface 21 of the heat sink 20. The lens 51 includes a solid prism (not shown) so as to cover the LED module 60, and one surface of the prism constitutes a half mirror (not shown). Thereby, the light from the LED module 60 is diffused in a wide range by the prism of the lens 51, and a wide light distribution characteristic can be obtained. The light from the LED module 60 is reflected toward the heat sink 20 and the base 40 by the half mirror. Thereby, the light distribution characteristic close | similar to the conventional incandescent lamp can be acquired.

  On the edge of the fixing portion 52, a notch 53 for inserting the protrusion 11 of the cover 10 is provided. An insertion hole may be used instead of the cut 53.

  The heat sink 20 has a cylindrical shape in which one side end (cover 10 side) is closed and the other side end (base 40 side) is open, and is made of metal having excellent thermal conductivity such as aluminum or aluminum alloy, for example. . The material of the heat sink 20 is not limited to aluminum or an aluminum alloy, and any other metal can be used as long as it is a metal having excellent thermal conductivity, but the weight can be reduced by using aluminum or the like. Can be planned.

  One end of the heat sink 20 forms a mounting surface 21. An LED module 60 is mounted on the mounting surface 21. The mounting surface 21 is provided with an insertion hole 211 through which the protrusion 11 of the cover 10 is inserted.

  The insulating portion 30 has a cylindrical shape with one end (cover 10 side) closed and the other end (cap 40 side) opened. The outer diameter dimension of the insulating part 30 is substantially equal to the inner diameter dimension of the heat sink 20, and an end surface 33 at one end of the insulating part 30 and a part of the side wall 34 are inscribed in the heat sink 20.

  The insulating part 30 is made of, for example, a synthetic resin having high thermal conductivity. Details of the high thermal conductivity will be described later.

  On the edge of the end face 33 of the insulating portion 30, a notch portion 31 as an engagement mechanism with which the protruding portion 11 of the cover 10 engages is opposed to the radial direction. Details of the engagement between the protrusion 11 and the notch 31 will be described later.

  A thread 32 for screwing the base 40 is formed at the other end of the insulating portion 30 exposed from the heat sink 20 of the insulating portion 30 inscribed in the heat sink 20.

  One end of the insulating part 30 is inserted inside the heat sink 20 on which the LED module 60 is mounted, the fixing part 52 of the lens part 50 is brought into contact with the mounting surface 21 of the heat sink 20, and a screw 91 is inserted from the inside of the insulating part 30. By fastening, the insulating part 30, the heat sink 20 (main body part 80), and the lens part 50 can be fixed. The base 40 can be attached by disposing the power supply unit 70 inside the insulating unit 30 and screwing the base 40 into the thread 32. The cover 10 can be fixed to the insulating part 30 (main body part 80) by inserting the protrusion 11 of the cover 10 into the notch 53 and the insertion hole 211 and engaging with the notch 31 of the insulating part 30.

  Next, the detail of the engagement mechanism which engages the cover 10 and the insulation part 30 (main-body part 80) is demonstrated. FIG. 3 is an external perspective view showing a state where the cover 10 and the insulating portion 30 of the present embodiment are engaged. In the example of FIG. 3, the heat sink 20 is omitted so that the engagement state of the protrusion 11 and the notch 31 as the engagement mechanism can be understood.

  As can be seen from FIG. 3, the protrusion 11 as an engagement mechanism that engages the cover 10 that covers the LED module 60 and the insulating portion 30 that houses the power supply 70 that supplies power to the LED module 60. And the notch part 31 engages in the position of the non-mounting surface side facing the mounting surface which mounts the LED module 60 of the main-body part 80. FIG. Since the protrusion 11 and the notch 31 are provided at the position on the non-mounting surface side, the position of the LED module 60 can be freely selected in order to obtain a desired light distribution. Narrowing can be prevented. Moreover, since the protrusion 11 and the notch 31 are provided at a position where the light from the LED module 60 is not blocked, the light from the LED module 60 can be prevented from being blocked, and the cover 10 It is also possible to prevent shadows from occurring.

  4 is an external view showing an example of the configuration of the protrusion 11 of the cover 10 according to the present embodiment, and FIG. 5 is an external view showing an example of the configuration of the notch 31 of the insulating portion 30 according to the present embodiment. FIG. 6 is a cross-sectional view of the main part showing an example of the engagement state of the engagement mechanism of the present embodiment. The engagement mechanism includes the protrusion 11 and the notch 31.

  As shown in FIG. 4, the protrusion 11 is provided at a peripheral end portion on one side end side of the cylindrical cover 10, and has a substantially plate shape having a length L, a width W, and a thickness D. In addition, the shape or dimension of the protrusion 11 can be determined as appropriate. The protrusion 11 is provided with a substantially rectangular locked hole 111 on a surface defined by a length L and a width W.

  As shown in FIG. 5, the notch portion 31 is provided on the edge of the end surface 33 of the insulating portion 30. The notch 31 is defined by the opposing side wall 311, the peripheral wall 314, and the bottom wall 312, and the interval W between the side walls 311 is approximately the same size as the width W of the protrusion 11. That is, when the protrusion 11 is engaged with the notch 31, the protrusion 11 is restricted from moving in the circumferential direction (rotational movement) of the cover 10 by the opposite side wall 311, so that the rotation is not shifted. .

  The end surface 33 is provided with an insertion hole 331 through which a screw 91 for fixing the insulating portion 30, the heat sink 20, and the lens portion 50 is inserted.

  The peripheral wall 314 is provided with a plate-like locking piece 313 that engages with the locked hole 111 provided in the protrusion 11 so as to be inclined outward. When the tip of the locking piece 313 engages (locks) with the locked hole 111, the protrusion 11 and the cutout 31 engage, and the cover 10 is engaged with the insulating portion 30 and attached. Can do.

  FIG. 6 shows a state where the cover 10 is attached to the insulating portion 30. As shown in FIG. 6, the insulating portion 30 is fixed in a state where it is inscribed in the heat sink 20. The protrusion 11 of the cover 10 is inserted through a notch (not shown) formed in the fixing portion 52, is inserted through an insertion hole 211 provided in the mounting surface 21 of the heat sink 20, and is engaged with the notch 31 of the insulating portion 30. Match. The locking piece 313 provided in the notch 31 is engaged (locked) in the locked hole 111 provided in the protrusion 11.

  An LED module 60 is mounted on the mounting surface 21, and the lens 51 is disposed so as to cover the LED module 60. The end surface 33 of the insulating portion 30 is in contact with the non-mounting surface 22 that faces the mounting surface 21.

  When the cover 10 is engaged with the insulating portion 30, the protrusion 11 is inserted into the notch 31 through the insertion hole 211, the locking piece 313 is pressed inward by the tip of the protrusion 11, and the protrusion 11, when the locked hole 111 provided in the protrusion 11 reaches the tip of the locking piece 313, the locking piece 313 returns to its original shape and engages with the locked hole 111 ( The locking piece 313 has a required elastic force. The dimensions and plate thickness of the locking piece 313 can be appropriately determined so as to have an appropriate elastic force.

  As described above, in the present embodiment, the protrusion 10 provided at the end portion of the cover 10 and the cutout portion 31 provided at the end portion of the insulating portion 30 are engaged with each other. The insulating part 30 is engaged. A protrusion 11 (provided to extend from or protrude from the end of the cover 10) provided at the end of the cover 10 is used as an engagement mechanism. That is, the protrusion 11 and the notch 31 are provided at a position on the non-mounting surface 22 side facing the mounting surface 21 on which the LED module 60 is mounted, and the cover 10 and the main body 80 (the heat sink 20 and the insulating portion 30) are engaged. It is supposed to match. The position on the non-mounting surface 22 side is, for example, the inside of the main body portion 80 (the heat sink 20 and the insulating portion 30). That is, the protrusion 11 and the notch 31 as an engagement mechanism are provided inside the main body 80 (heat sink 20, insulating part 30). Accordingly, the engagement mechanism does not protrude from the mounting surface 21, and the position of the LED module 60 can be freely selected on the mounting surface 21 in order to obtain a desired light distribution, and the LED module 60 can be arranged. It is possible to prevent the range from being narrowed.

  In other words, in the present embodiment, the mounting surface 21 of the heat sink 20 does not have an engagement mechanism that engages the cover 10 and the insulating portion 30 (main body portion 80). The LED module 60 can be arranged at any position (any position on the mounting surface 21) inside the cover 10 covering the light source, and the light source can be freely arranged according to the type or shape of the light source. The degree of freedom in designing the arrangement can be increased. Moreover, since there is no engagement mechanism inside the cover that covers the LED module 60, the light from the LED module 60 is not blocked.

  Further, conventionally, in order to prevent rattling between the cover and the insulating portion, it has been necessary to use a relatively large amount of adhesive on the joint surface between the cover and the heat sink. Since the protrusion 30 and the notch 31 are engaged with the portion 30, the amount of the adhesive can be reduced, and the appearance irregularity due to the light unevenness due to the adhesive and the protruding of the adhesive can be eliminated.

  Further, in this embodiment, even when a force (rotational movement force) that causes the cylindrical cover 10 or the insulating portion 30 to shift in the circumferential direction is applied, the protrusion 11 and the notch 31 are engaged. Since the mechanism, more specifically, the protrusion 11 is restricted from moving in the circumferential direction (rotational movement) of the cover 10 by the opposing side wall 311 so as not to rotate. Can be dispersed by the engagement mechanism between the protrusion 11 and the notch 31, increasing the attachment strength between the cover 10 and the insulating portion 30, and maintaining the rotational strength while suppressing the thickness of the cover 10. Can do.

  In the present embodiment, the locking piece 313 provided in the notch 31 and the locked hole 111 provided in the protrusion 11 are provided, and the locking piece 313 of the insulating portion 30 covers the cover. Since the ten engaged holes 111 are engaged, the cover 10 and the insulating portion 30 can be securely attached.

  Moreover, in this Embodiment, it has the mounting surface 21 which mounts the LED module 60, and is provided with the heat sink 20 externally fitted by the insulating part 30. FIG. The heat sink 20 includes an insertion hole 211 through which the projection 11 of the cover 10 is inserted into the mounting surface 21. That is, when the protrusion 11 of the cover 10 is engaged with the notch 31 of the insulating part 30, the protrusion 11 is inserted through the insertion hole 211 of the heat sink 20 and the notch 31 of the insulating part 30 disposed inside the heat sink 20. Therefore, the engagement mechanism is disposed inside the heat sink 20, and the engagement mechanism is not visible from the outside of the heat sink 20 (that is, the appearance of the lighting device 100). Therefore, since there is no engagement mechanism on the mounting surface 21 on which the LED module 60 is mounted, the position of the LED module 60 can be freely selected to obtain a desired light distribution. Moreover, the light from the LED module 60 can be prevented from being blocked, and the cover 10 can also be prevented from being shaded.

  Further, since the protrusion 11 is inserted into the insertion hole 211 of the heat sink 20, the attachment strength between the cover 10 and the insulating part 30 fixed to the heat sink 20 can be further increased. The strength against rotational displacement can be increased.

  Further, in the present embodiment, a notch 53 for inserting the protruding portion 11 of the cover 10 into the edge of the fixing portion 52 fixed to the heat sink 20 is provided. Since the protrusion 11 is inserted through the notch 53 of the fixed portion 52, the attachment strength between the cover 10 and the insulating portion 30 can be further increased, and the strength against rotational displacement between the cover 10 and the insulating portion 30 can be increased. .

  Moreover, in this Embodiment, the attachment intensity | strength of the cover 10 and the insulation part 30 can further be increased by providing the protrusion 11 and the notch part 31 in multiple numbers, respectively.

  FIG. 7 is a main part sectional view showing another example of the engagement state of the engagement mechanism of the present embodiment. The difference from FIG. 6 is that a locking piece 112 is provided in the protrusion 11 of the cover 10, and a locked hole 315 that engages (locks) with the locking piece 112 is provided in the notch 31. In the case of FIG. 7 as well, the same effect as in the case of FIG. 6 is obtained. Moreover, since the locking piece 112 of the cover 10 engages with the locked hole 315 of the insulating portion 30, the cover 10 and the insulating portion 30 can be securely attached.

  Next, the high thermal conductivity of the insulating unit 30 will be described. FIG. 8 is a cross-sectional view of the main part showing an example of the configuration of the illumination device 100 of the present embodiment. FIG. 8 shows an example of a heat dissipation structure for heat generated in the LED module 60.

  As shown in FIG. 8, the lighting device 100 includes the base 40 and the heat sink 20 in which the LED module 60 is mounted on the mounting surface 21, and has high thermal conductivity, and insulates the base 40 and the heat sink 20. The unit 30 is provided. In the present embodiment, the high thermal conductivity means that the thermal conductivity of the insulating portion 30 is, for example, in a range of approximately 1 W / (m · K) to several tens of W / (m · K). However, for example, if it is about 3 W / (m · K), the required heat dissipation efficiency can be obtained.

  The insulating part 30 is a synthetic resin including a thermally conductive filler, and extends from one side end side (LED module 60 side) that is the light source part side of the insulating part 30 to the other end side (base 40 side) that is the base side. The flow direction of the synthetic resin. For example, carbon (carbon), graphite (graphite), alumina, iron powder, silicon nitride, or the like can be used as the thermally conductive filler, but it is not limited thereto.

  The flow direction of the synthetic resin means, for example, a direction in which the uncured synthetic resin flows in the injection mold when the insulating portion 30 is formed by injection molding. That is, the insulating portion 30 is injected by flowing a synthetic resin before curing from one end side (the end face 33 side, that is, the LED module 60 side) to the other end side (the opening end 321 side, that is, the base 40 side). Molded. Since the thermally conductive filler tends to be oriented along the flow direction, the thermal conductivity increases along the flow direction. In addition, the flow direction is a direction of an arrow schematically indicated by a symbol A in FIG. 8, and is directed in a radial direction from the approximate center of the end surface 33 toward the peripheral edge. This is the direction from the LED module 60 side toward the other end side (the base 40 side). It should be noted that the direction opposite to the direction indicated by the arrow A, that is, from the other end side of the insulating portion 30 (opening end 321 side, ie, the base 40 side) to one side end side (end surface 33 side, ie, LED module 60 side). The direction along is also included in the flow direction described above.

  A power supply unit 70 is disposed and accommodated inside the insulating unit 30.

  The heat generated in the LED module 60 is not only radiated from the heat sink 20, but also radiated from the base 40 through the insulating portion 30 having high thermal conductivity from the heat sink 20, so that the heat radiation efficiency can be improved. Moreover, since heat is radiated from the base 40, the heat sink 20 can be reduced in size and weight.

  The lighting device 100 according to the present embodiment can be applied to a lighting device including a base such as an E26 base, an E17 base, etc. In particular, in the case of an E26 base, the base 40 has a heat dissipation effect from the base 40. The desired heat dissipation effect can be obtained even if the surface area of the heat sink 20 is reduced to about 1 to 1.5 times the surface area of the heat sink 20, so that the heat sink 20 can be reduced, and the lighting device 100 is small and lightweight. Can be achieved.

  In the present embodiment, each of the heat sink 20 and the insulating part 30 has a cylindrical shape in which one side end on the light source part side is closed, and an end surface 33 which is one side end of the insulating part 30 and a part of the side wall are formed. Inscribed in the heat sink 20. An LED module 60 is mounted on the mounting surface 21 that is one end of the cylindrical heat sink 20. And since the end surface 33 and a part of side wall of the insulation part 30 are inscribed in the heat sink 20, the contact area of the insulation part 30 and the heat sink 20 becomes large, and the heat from the LED module 60 is insulated from the heat sink 20 to the insulation part 30. Therefore, heat can be easily conducted to the base 40, and the heat radiation efficiency can be further improved.

  Further, the base 40 is screwed onto the thread of the insulating portion 30 exposed from the heat sink 20. Thereby, since heat becomes easy to conduct from the insulating part 30 to the base 40, the heat radiation efficiency can be further improved.

  Moreover, since the insulating part 30 has the flow direction of the synthetic resin from the one side end side (the LED module 60 side) to the other end side (the base 40 side), the one side end side (that is, the LED module) of the insulating part 30 Since the thermal conductivity increases from the portion provided with 60 to the other end side (that is, the portion provided with the base 40), the heat of the LED module 60 can be efficiently conducted to the base 40. .

  The insulating unit 30 houses the power supply unit 70, and the thermal conductivity in the flow direction of the insulating unit 30 is higher than the thermal conductivity in the thickness direction of the insulating unit 30. Note that the thickness direction is perpendicular to the flow direction, and is the direction of the arrow schematically shown in FIG. In order to make the thermal conductivity in the flow direction of the insulating portion 30 higher than the thermal conductivity in the thickness direction of the insulating portion 30, the orientation of the thermal conductive filler should be aligned in the flow direction, or a scale-like or flat shape, etc. It can be realized by giving thermal conductivity anisotropy using a thermally conductive filler. For example, the thermal conductivity in the thickness direction can be in the range of about 1/3 to 1/20 of the thermal conductivity in the flow direction.

  By making the thermal conductivity in the flow direction of the insulating portion 30 higher than the thermal conductivity in the thickness direction, the heat conducted through the insulating portion 30 is conducted toward the base 40 and conducted toward the power source portion 70. It can suppress and the temperature rise of the power supply part 70 can be suppressed.

  In the above-described embodiment, the lighting device including the LED module as the light source has been described. However, the light source is not limited to the LED module, and may be EL (Electro Luminescence) or the like as long as it is a light emitting element having surface emission. .

DESCRIPTION OF SYMBOLS 10 Cover 11 Protruding part 111,315 Locked hole 20 Heat sink 21 Mounting surface 211 Insertion hole 30 Insulating part 31 Notch part 313,112 Locking piece 32 Thread 33 End face 40 Base 50 Lens part 51 Lens 52 Fixed part 53 Notch LED module 70 Power supply unit 80 Main unit

Claims (5)

With a base,
A heat sink fitted with a light source,
An illuminating device comprising an insulating portion that has high thermal conductivity and insulates the base and the heat sink. The insulating part is
It is a synthetic resin molded product containing a thermally conductive filler,
2. The lighting device according to claim 1, wherein a flow direction of the synthetic resin is provided along the base side from the light source unit side of the insulating unit. Both of the heat sink and the insulating part have a cylindrical shape with one side end closed on the light source part side,
The lighting device according to claim 1, wherein the one end and a part of the side wall of the insulating portion are inscribed in the heat sink. The insulating part is
Contains a power supply for supplying power to the light source;
The lighting device according to claim 2 or 3, wherein the thermal conductivity in the flow direction is higher than the thermal conductivity in the thickness direction of the insulating portion. The other end side of the insulating part is exposed from the heat sink,
The lighting device according to claim 3, wherein the base is screwed to the other end side.

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