JP5719607B2 - LED lamp and manufacturing method of LED lamp - Google Patents

Description

  The present invention relates to an LED lamp and a method for manufacturing the LED lamp.

  FIG. 32 is a cross-sectional view showing an example of a conventional LED lamp. The LED lamp 900 shown in the figure includes a substrate 91, a plurality of LED modules 92, a heat dissipation member 95, a tube 93, caps 961 and 962, and a terminal 94. Each LED module 92 is mounted on the substrate 91. A substrate 91 is attached to the heat dissipation member 95. The tube 93 has a cylindrical shape and houses a substrate 91, an LED module 92, and a heat dissipation member 95. Each cap 961 and 962 closes the opening of the tube 93. The terminal 94 is fitted into the insertion port of the straight tube type fluorescent lamp socket. A wiring pattern (not shown) connected to the plurality of LED modules 92 and the terminals 94 is formed on the substrate 91. The LED lamp is described in Patent Document 1, for example.

  When the LED lamp 900 is used, heat is generated in the LED module 92. The heat is transmitted to the heat radiating member 95 through the substrate 91. The heat transmitted to the heat radiating member 95 is released from the heat radiating member 95 to the space inside the tube 93. If it does so, heat will remain in the space inside the tube 93 and there exists a possibility that the temperature of the said space may rise excessively.

  The caps 961 and 962 may be made of resin. When the resin is white, for example, light easily passes through the caps 961 and 962. Therefore, when the LED lamp 900 is used, the cap 961 may gradually become darker from the right side to the left side in FIG. The cap 961 gradually darkens from the right side to the left side in the figure, which is an appearance that is not often seen with conventional straight tube fluorescent lamps. Therefore, when the LED lamp 900 is used as an alternative to the straight tube type fluorescent lamp that has been conventionally used, the user may feel uncomfortable.

Japanese Utility Model Publication No. 6-54103

  The present invention has been conceived under the above circumstances, and its main object is to provide an LED lamp capable of efficiently discharging heat to the outside.

  The LED lamp provided by the first aspect of the present invention includes a tube, a heat dissipation member extending in the axial direction of the tube, a support member accommodated in the tube, and accommodated in the tube and attached to the support member. A plurality of supported LED chips, and an adhesive layer that is interposed between the heat dissipation member and the tube and adheres the heat dissipation member and the tube.

  In a preferred embodiment of the present invention, the tube is made of a material having a linear expansion coefficient larger than that of the material constituting the heat radiating member.

  In a preferred embodiment of the present invention, the plurality of LED chips, the heat dissipation member, and the adhesive layer are all surrounded by the tube and out of the space defined by the tube. It is accommodated in one of two spaces partitioned by a virtual plane passing through the axis.

  In a preferred embodiment of the present invention, the adhesive layer has a shape extending along the axial direction.

  In a preferred embodiment of the present invention, the heat dissipation member is formed with a first groove extending along the axial direction, and the adhesive layer is formed in the first groove.

  In a preferred embodiment of the present invention, the heat dissipation member has a first outer surface along a circumferential direction of the tube and the axial direction, the adhesive layer is in contact with the first outer surface, and the first groove Is recessed from the first outer surface.

  In a preferred embodiment of the present invention, the heat radiating member is formed with a second groove that is recessed from the first outer surface and extends along the axial direction, and the first groove is formed in the circumferential direction of the tube. Separated from the second groove, the adhesive layer is formed in the second groove.

  In a preferred embodiment of the present invention, the heat radiating member has a second outer surface connected to the second groove, and the second outer surface is located on the opposite side of the first surface with respect to the second groove. In addition, the entire surface is exposed from the adhesive layer.

  In a preferred embodiment of the present invention, the heat radiating member has a groove surface that defines the first groove, and the groove surface has a portion that is separated from the adhesive layer via a gap.

  In a preferred embodiment of the present invention, the heat radiating member is formed with a hollow portion extending in the axial direction.

  In a preferred embodiment of the present invention, the hollow portion opens in the axial direction.

  In a preferred embodiment of the present invention, the cavity has a long rectangular cross-sectional shape by a surface orthogonal to the axial direction, and the cavity is formed from the tube axis to the adhesive layer when viewed in the axial direction. It is the shape extended in the direction which goes to.

  In preferable embodiment of this invention, the said contact bonding layer contains the resin part and the filler mixed in the said resin part, and the said filler is larger than the heat conductivity of the material which comprises the said resin part. It consists of a material with thermal conductivity.

  In a preferred embodiment of the present invention, the resin portion is made of a silicone material.

  In a preferred embodiment of the present invention, the tube includes an outer cylindrical portion having a circular cross section and a protruding portion protruding from the outer cylindrical portion, and the protruding portion fits into the first groove. The adhesive layer is interposed between the protruding portion and the first groove.

  In a preferred embodiment of the present invention, the projecting portion has a plurality of strips spaced apart along the axial direction.

  In a preferred embodiment of the present invention, a cap including a first semi-cylindrical part and a second semi-cylindrical part is further provided, and the tube allows light to pass through the light emitted from each LED chip. A space is formed, the first semi-cylindrical part surrounds the tube together with the second semi-cylindrical part, and the cap is arranged in the axial direction of the tube toward the axis of the tube. The first light-shielding wall rises from the tubular portion, the first light-shielding wall faces the light passage space, and overlaps the support member in the axial direction.

  In a preferred embodiment of the present invention, the first semi-cylindrical portion has a first end located at an end in the circumferential direction of the tube, and the second semi-cylindrical portion is in the circumferential direction. A second end portion located at the end is provided, and the first end portion faces the second end portion.

  In a preferred embodiment of the present invention, the cap has a second light shielding wall that faces the light passage space and overlaps the first end and the second end in the circumferential direction.

  In a preferred embodiment of the present invention, the cap includes a third semi-cylindrical portion connected to the first semi-cylindrical portion and a fourth semi-cylindrical portion connected to the second semi-cylindrical portion. The third semi-cylindrical part has a third end located at the end in the circumferential direction, and the fourth semi-cylindrical part has a fourth end located at the end in the circumferential direction. The third end portion faces the fourth end portion.

  In a preferred embodiment of the present invention, the cap includes a first projecting portion connected to the third semi-cylindrical portion and projecting from the third semi-cylindrical portion toward the support member, and the support member Is sandwiched between the first projecting portion and the fourth semi-cylindrical portion.

  In a preferred embodiment of the present invention, the cap includes a second projecting portion connected to the fourth semi-cylindrical portion and projecting from the fourth semi-cylindrical portion toward the support member. A through hole is formed, the first projecting portion is formed with a first hole opening toward the through hole, and the second projecting portion is opened with respect to the first hole. A second hole is formed.

  In a preferred embodiment of the present invention, the second protrusion is fitted in the through hole.

  In a preferred embodiment of the present invention, the cap includes a contact portion that contacts the support member, and the contact portion extends from the first light shielding wall to the plurality of LED chips in the axial direction of the tube. Is away from the first protrusion in the direction toward either of the above.

  In a preferred embodiment of the present invention, the cap has a third light shielding wall that overlaps the third end and the fourth end in the circumferential direction, and the third semi-cylindrical portion and the fourth end. Each of the semi-cylindrical portions is thicker than any thickness of the first semi-cylindrical portion and the second semi-cylindrical portion, and the third light shielding wall is the third semi-cylindrical shape in the radial direction of the tube. And any one of the fourth semi-cylindrical parts.

  In a preferred embodiment of the present invention, each of the third semi-cylindrical portion and the fourth semi-cylindrical portion is thicker than any thickness of the first semi-cylindrical portion and the second semi-cylindrical portion. The fourth semi-cylindrical portion is formed with a recess in which the support member is fitted.

  In a preferred embodiment of the present invention, the circuit component further includes a circuit component housed in the cap, and the circuit component is provided between a diode bridge having two input terminals and two output terminals, and the two input terminals. The plurality of LED chips are electrically interposed between the two output terminals.

  In a preferred embodiment of the present invention, the circuit component includes an AC / DC converter that converts an input commercial AC voltage into a DC voltage.

  The LED lamp manufacturing method provided by the second aspect of the present invention includes a step of disposing a plurality of LED chips on a heat dissipation member, a step of accommodating the heat dissipation member and the plurality of LED chips in a tube, and the heat dissipation. Bonding the member and the tube with an adhesive, and in the bonding step, the nozzle opening is moved along the axial direction of the tube between the heat dissipation member and the tube. The adhesive is discharged from the opening.

  Other features and advantages of the present invention will become more apparent from the detailed description given below with reference to the accompanying drawings.

It is a front view of the LED lamp concerning 1st Embodiment of this invention. It is a bottom view of the LED lamp concerning 1st Embodiment of this invention. FIG. 3 is an exploded sectional view taken along line III-III in FIG. 2. It is sectional drawing which follows the IV-IV line of FIG. FIG. 4 is a partially enlarged view of FIG. 3. It is sectional drawing which follows the VI-VI line of FIG. It is sectional drawing which follows the VII-VII line of FIG. It is a disassembled perspective view of the cap shown on the left side of FIG. It is a top view of the 1st member of the cap shown in FIG. It is a top view of the 2nd member of the cap shown in FIG. FIG. 4 is a partially enlarged view of FIG. 3. It is sectional drawing which follows the XII-XII line | wire of FIG. It is sectional drawing which follows the XIII-XIII line | wire of FIG. It is a disassembled perspective view of the cap shown on the right side of FIG. It is a top view of the 1st member of the cap shown in FIG. It is a top view of the 2nd member of the cap shown in FIG. It is a circuit diagram in an LED lamp. It is principal part sectional drawing which shows the specific structure of an LED module. It is sectional drawing which shows 1 process of the manufacturing method of the LED lamp concerning 1st Embodiment of this invention. It is sectional drawing which follows the XX-XX line of FIG. It is a bottom view of the LED lamp concerning 2nd Embodiment of this invention. It is sectional drawing which follows the XXII-XXII line | wire shown in FIG. It is sectional drawing of the LED lamp concerning 3rd Embodiment of this invention. It is an exploded sectional view of the LED lamp concerning a 4th embodiment of the present invention. It is sectional drawing which follows the XXV-XXV line | wire of FIG. It is a bottom view of the LED lamp concerning 5th Embodiment of this invention. It is sectional drawing which follows the XXVII-XXVII line of FIG. It is a bottom view of the LED lamp concerning 6th Embodiment of this invention. It is a disassembled perspective view which shows the cap of the LED lamp concerning 7th Embodiment of this invention. It is sectional drawing of the LED lamp concerning 7th Embodiment of this invention. It is a disassembled perspective view which shows the cap of the LED lamp concerning 7th Embodiment of this invention. It is sectional drawing which shows an example of the conventional LED lamp.

  Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings.

<First Embodiment>
1st Embodiment of this invention is described using FIGS.

  FIG. 1 is a front view of an LED lamp according to the present embodiment. FIG. 2 is a bottom view of the LED lamp according to the present embodiment. 3 is an exploded cross-sectional view taken along line III-III in FIG. 4 is a cross-sectional view taken along line IV-IV in FIG.

  The LED lamp 101 shown in these drawings includes a support member 1, an LED module 2, a circuit component 31, a ground terminal 32, a tube 4, an adhesive layer 5, and caps 7 and 8. The LED lamp 101 is used as an alternative to a straight tube fluorescent lamp.

  FIG. 18 is a cross-sectional view of a principal part showing a specific configuration of the LED module 2.

  Each of the plurality of LED modules 2 shown in FIGS. 3 and 4 includes an LED chip 21, a sealing resin 22, leads 25A and 25B, and a reflector 26, as shown in FIG. The LED module 2 has a width of 4.0 mm, a length of 2.0 mm, and a thickness of about 0.6 mm. The LED module 2 is small and very thin.

  Each of the leads 25A and 25B is a plate-like member made of, for example, a Cu—Ni alloy. Each of the leads 25A and 25B is used as a mounting terminal for surface mounting the LED module 2. The reflector 26 is made of, for example, white resin.

  The LED chip 21 is a light source of the LED module 2 and emits visible light, for example. The LED chip 21 is mounted on the lead 25B via, for example, silver paste. The LED chip 21 is electrically connected to the lead 25B. The LED chip 21 is electrically connected to the lead 25A through a wire. When current flows through the LED chip 21, light is emitted from the LED chip 21, and heat is generated in the LED chip 21 (LED module 2).

  The sealing resin 22 is for protecting the LED chip 21. The sealing resin 22 is made of, for example, an epoxy resin that transmits light emitted from the LED chip 21. Or sealing resin 22 consists of translucent resin containing the fluorescent substance which emits the light of a different wavelength, when excited by the light which LED chip 21 emitted, for example. When the blue light from the LED chip 21 and the yellow light from the fluorescent material contained in the sealing resin 22 are mixed, the LED module 2 can emit white light.

  A support member 1 shown in FIGS. 3 and 4 supports a plurality of LED modules 2. The support member 1 includes a substrate 11, a wiring pattern (not shown), and a heat dissipation member 13. The substrate 11 is made of, for example, a glass epoxy resin. The substrate 11 has a long rectangular shape extending along a plane including a direction X (a direction in which an axis Ox of a tube 4 described later extends). On the substrate 11, a plurality of LED modules 2 are arranged along the direction X. The wiring pattern is formed on the substrate 11 and is made of a conductive material. The wiring pattern is for supplying power to each LED module 2.

  The heat radiating member 13 is for efficiently discharging the heat generated in each LED module 2 to the outside of the LED lamp 101. The heat dissipating member 13 extends along the direction X. The substrate 11 is bonded to the heat dissipation member 13. The heat dissipation member 13 supports the substrate 11 and the plurality of LED modules 2. The heat radiating member 13 is made of a material having a relatively high thermal conductivity. The thermal conductivity of the material constituting the heat radiating member 13 is larger than the thermal conductivity of the material constituting the substrate 11. The heat radiating member 13 is made of Al, for example.

  As shown in FIG. 4, the heat dissipation member 13 includes a base portion 13 a and convex portions 13 b and 13 c. The base portion 13a has a shape extending along the direction X. Each convex portion 13 b protrudes from the base portion 13 a along the substrate 11. Each convex portion 13 b extends along the direction X. The base portion 13 a and the convex portion 13 b support the substrate 11. Each convex portion 13 c protrudes from the base portion 11 a so as to be separated from the LED module 2. Each convex portion 13 c extends along the direction X. A plurality of first grooves 131 (two in this embodiment) are formed in the heat dissipation member 13. Each groove 131 is located between two adjacent convex portions 13c. Each groove 131 extends along the direction X. In the present embodiment, each groove 131 is formed from one end to the other end in the direction X of the heat dissipation member 13. Each groove 131 is defined by a groove surface 132. As shown in FIG. 3, the heat dissipation member 13 is formed with through holes 139 a and 139 b. The through hole 139 a is located at one end in the direction X of the heat radiating member 13, and the through hole 139 b is located at the other end in the direction X of the heat radiating member 13.

  FIG. 17 shows a circuit diagram of the LED lamp 101.

  The circuit component 31 shown in FIGS. 3 and 17 includes a substrate 311, a diode bridge 312, a resistor 313, a fuse 314, an AC / DC converter 315 (not shown except for FIG. 17), and two terminals 316. Including. The substrate 311 is made of, for example, a glass epoxy resin. Each terminal 316 is for supplying electric power to the LED chip 21 from the outside of the LED lamp 101. Each terminal 316 is inserted into one of two insertion ports formed in a socket for installing the LED lamp 101.

  The diode bridge 312 has two input terminals 312a and 312b and two output terminals 312c and 312d. A plurality of LED chips 21 are electrically interposed between the output terminals 312c and 312d. The diode bridge 312 outputs the absolute value of the voltage of the input terminal 312a with respect to the input terminal 312b as the voltage of the output terminal 312c with respect to the output terminal 312d. Therefore, when the LED lamp 101 is used, the diode bridge 312 can always flow current toward the anode side of the LED chip 21. Therefore, it is not necessary to consider which of the terminals 316 should be inserted into which of the two insertion ports in the socket. A resistor 313 is electrically interposed between the two input terminals 312a and 312b. The resistor 313 is for a circuit (not shown) to detect whether or not the LED lamp 101 is mounted in the socket.

  The fuse 314 is in contact with the terminal 316 and the output terminal 312a, and is electrically interposed between the terminal 316 and the output terminal 312a. Note that the circuit component 31 is not necessarily required to have the fuse 314. The AC / DC converter 315 is electrically interposed between the two terminals 316 and the two input terminals 312a and 312b. The AC / DC converter 315 converts an alternating current supplied via the two terminals 316 into a direct current constant current. The circuit component 31 is not necessarily required to include the AC / DC converter 315.

  The grounding terminal 32 shown in FIGS. 1 to 3 and the like is electrically connected to the heat radiating member 13. When the LED lamp 101 is used, the grounding terminal 32 is grounded. Therefore, when the heat radiating member 13 is made of a conductive material, there is no risk of electric shock even if a human hand touches the heat radiating member 13 during use of the LED lamp 101 in which current flows through the LED chip 21.

  The tube 4 is for protecting the support member 1 and the plurality of LED modules 2. The tube 4 accommodates the support member 1 and the plurality of LED modules 2. The tube 4 extends in the direction X. The tube 4 is made of a resin such as polycarbonate. The tube 4 is formed by extrusion molding. The tube 4 may be made of glass. The coefficient of linear expansion of the material constituting the tube 4 is often larger than the coefficient of linear expansion of the material constituting the heat dissipation member 13. In the present embodiment, the dimension of the tube 4 in the direction X is smaller than the dimension of the support member 1 in the direction X. The tube 4 opens to the direction X1 side in the direction X, and opens to the direction X2 (direction opposite to the direction X1) side of the direction X. The support member 1 protrudes in the direction X1 from the opening on the direction X1 side of the tube 4. Similarly, the support member 1 protrudes in the direction X2 from the opening of the tube 4 on the direction X2 side. The tube 4 is formed with a light passage space 45 through which the light emitted from the LED chip 21 passes. In the present embodiment, the light passage space 45 is a space on the side where the axis Ox is located with respect to the support member 1 in the internal space of the tube 4.

  As shown in FIG. 4, in the present embodiment, the plurality of LED modules 2 (including the LED chip 21), the heat dissipation member 13, and the adhesive layer 5 described later are all surrounded by the tube 4 and the tube. 4 is accommodated in any one of two spaces defined by a virtual plane 891 passing through the axis Ox of the tube 4 among the spaces defined by 4 (spaces having a circular cross section in the present embodiment). In the drawing, a portion of the tube 4 that faces one of the two spaces described above (a lower portion in the drawing) is a portion 48. In the drawing, a portion (upper portion in the drawing) facing the other of the above-described two spaces in the tube 4 is a portion 49.

  As shown in FIG. 4, the tube 4 includes an outer cylinder portion 41 and a plurality of protruding pieces 42 and 43. The outer cylinder portion 41 is cylindrical and has a circular cross-sectional shape by a plane perpendicular to the direction X. Each protruding piece 42, 43 extends from the outer cylinder portion 41 along the direction in which the substrate 11 spreads. The protruding pieces 42 and 43 have a shape extending along the direction X. Each protruding piece 42 is in contact with the upper side of FIG. Each protruding piece 43 is in contact with the convex portion 13 b of the heat radiating member 13. The protruding pieces 42 and 43 are for preventing the support member 1 from being displaced in the tube 4.

  As shown in FIG. 4, the adhesive layer 5 bonds the heat radiating member 13 of the support member 1 and the tube 4. The adhesive layer 5 is interposed between the heat dissipation member 13 and the tube 4. The adhesive layer 5 is in direct contact with the heat dissipation member 13 and the tube 4. In the present embodiment, the adhesive layer 5 is formed in each groove 131. The adhesive layer 5 has a shape extending along the direction X. The adhesive layer 5 is in contact with the groove surface 132 from one end to the other end in the direction X of the groove surface 132. Similarly, the adhesive layer 5 is in contact with the tube 4 from one end to the other end in the direction X of the tube 4. As shown in FIGS. 2 and 4, the adhesive layer 5 has an edge 53 that extends along the direction X.

  As shown in FIG. 4, the adhesive layer 5 includes a resin part 51 and a filler 52. The resin portion 51 is made of, for example, a silicone resin or an epoxy resin. The fillers 52 are scattered in the resin part 51. The filler 52 is made of a material having a higher thermal conductivity than the material constituting the resin portion 51. An example of such a material is titanium oxide. As the adhesive layer 5, for example, rubber of product number KE3467 manufactured by Shin-Etsu Silicone may be used.

  As shown in FIGS. 1 to 3, the cap 7 is located at the end of the tube 4 on the direction X <b> 1 side. The cap 7 closes the opening of the tube 4 on the direction X1 side. The cap 7 is fixed to the support member 1. On the other hand, there is a slight gap between the cap 7 and the tube 4. Therefore, the cap 7 is partially in contact with the tube 4 but is not fixed to the tube 4. The cap 7 is made of, for example, resin, ceramic, or metal. In the present embodiment, the cap 7 is made of resin. The cap 7 accommodates the circuit component 31. A terminal 316 protrudes from the cap 7. In the present embodiment, the cap 7 includes a first member 71 and a second member 72. The first member 71 and the second member 72 are each integrally molded. Unlike the present embodiment, the entire cap 7 may be integrally molded.

  FIG. 5 is a partially enlarged view of FIG. 6 is a cross-sectional view taken along the line VI-VI in FIG. 7 is a cross-sectional view taken along line VII-VII in FIG. FIG. 8 is an exploded perspective view of the cap 7 shown on the left side of FIG. FIG. 9 is a plan view of the first member 71 of the cap 7 shown in FIG. FIG. 10 is a plan view of the second member 72 of the cap 7 shown in FIG.

  As shown in FIGS. 5 to 9, the first member 71 includes a semi-cylindrical part 711 (first semi-cylindrical part), a semi-cylindrical part 713 (third semi-cylindrical part), and a light shielding wall 715 ( A first light shielding wall), a projecting portion 717 (first projecting portion), and a support wall 718;

  The cross-sectional shape of the semi-cylindrical portion 711 is a concave shape that opens in one direction. In the present embodiment, the semi-cylindrical portion 711 has a semi-cylindrical shape. The semi-cylindrical portion 711 has an end portion 711a. Each end portion 711a is a first end portion, and is located at the end of the semi-cylindrical portion 711 in the circumferential direction of the tube 4 (the rotation direction about the axis Ox). The end portions 711a face in the same direction (downward direction in FIG. 7). The semi-cylindrical part 713 is connected to the semi-cylindrical part 711. As shown in FIG. 5, the semi-cylindrical portion 713 is located on the direction X1 side with respect to the semi-cylindrical portion 711 in the direction X. The cross-sectional shape of the semi-cylindrical part 713 is a concave shape opened in one direction. In the present embodiment, the semi-cylindrical portion 713 has a semi-cylindrical shape. The thickness of the semi-cylindrical part 713 (the dimension in the radial direction of the tube 4) is larger than the thickness of the semi-cylindrical part 711 (the dimension in the radial direction of the tube 4). The semi-cylindrical part 713 has an end part 713a. Each end portion 713 a is a third end portion and is located at an end in the circumferential direction of the tube 4. The end portions 713a face in the same direction (downward direction in FIG. 6).

  The light shielding wall 715 shown in FIGS. 7 to 9 stands up from the semi-cylindrical portion 711 toward the axis Ox when viewed in the direction X. The light shielding wall 715 faces the light passage space 45. As shown in FIG. 5, the light shielding wall 715 overlaps the support member 1 in the direction X. The light shielding wall 715 extends along a plane perpendicular to the axis Ox. As shown in FIG. 8, in the present embodiment, the light shielding wall 715 is connected to the semi-cylindrical portion 711 over the entire inner surface of the semi-cylindrical portion 711 in the circumferential direction of the tube 4.

  As shown in FIG. 5, the protruding portion 717 is connected to the semi-cylindrical portion 713. The protruding portion 717 protrudes from the semi-cylindrical portion 713 toward the support member 1. The protruding portion 717 is in direct contact with the support member 1.

  As shown in FIG. 5, a hole 717 a and a hole 717 b are formed in the first member 71 of the cap 7. The hole 717 a is a first hole and is formed in the protruding portion 717. The hole 717 a opens toward the through hole 139 a of the heat dissipation member 13. The hole 717 b is formed in the protruding portion 717 and the semi-cylindrical portion 713. The hole 717b is open toward the side opposite to the side where the support member 1 is located and communicates with the hole 717a.

  As shown in FIG. 5, the support wall 718 is connected to the light shielding wall 715. The support wall 718 has an abutting portion 718a that abuts against the support member 1 (in this embodiment, the heat dissipation member 13). The contact portion 718a is separated from the protruding portion 717 in the direction X from the light shielding wall 715 toward one of the plurality of LED chips 21. That is, as shown in FIG. 5, the contact portion 718 a is located on the direction X <b> 2 side with respect to the protruding portion 717.

  As shown in FIGS. 5 to 8 and 10, the second member 72 includes a semi-cylindrical portion 721 (second semi-cylindrical portion), a semi-cylindrical portion 723 (fourth semi-cylindrical portion), and light shielding. It has a wall 726 (third light shielding wall) and a protrusion 727 (second protrusion).

  The cross-sectional shape of the semi-cylindrical portion 721 is a concave shape that opens in one direction. In the present embodiment, the semi-cylindrical portion 721 has a semi-cylindrical shape. The semi-cylindrical part 721 has an end part 721a. Each end 721 a is a second end, and is located at the end of the semi-cylindrical portion 721 in the circumferential direction of the tube 4. The end portions 721a face in the same direction (upward direction in FIG. 7). The end portion 721a faces the end portion 711a. A semi-cylindrical part 711 surrounds the tube 4 together with the semi-cylindrical part 721. The semi-cylindrical part 723 is connected to the semi-cylindrical part 721. As shown in FIG. 5, the semi-cylindrical part 723 is located in the direction X <b> 1 side with respect to the semi-cylindrical part 721 in the direction X. The cross-sectional shape of the semi-cylindrical part 723 is a concave shape opened in one direction. In the present embodiment, the semi-cylindrical portion 723 has a semi-cylindrical shape. The thickness of the semi-cylindrical part 723 (dimension in the radial direction of the tube 4) is larger than the thickness of the semi-cylindrical part 721 (dimension in the radial direction of the tube 4). The semi-cylindrical part 723 is in contact with the support member 1 (in this embodiment, the heat dissipation member 13). The semi-cylindrical part 723 has an end part 723a. Each end 723a is located at the end of the tube 4 in the circumferential direction. Each end portion 723a faces in the same direction (upward direction in FIG. 6). The end 723a faces the end 713a. The circuit component 31 is surrounded by the semi-cylindrical part 713 and the semi-cylindrical part 723. The semi-cylindrical portion 723 is formed with a recess 723b. The support member 1 (in this embodiment, the heat radiating member 13) is fitted in each recess 723b. Thereby, it can prevent that the supporting member 1 shifts | deviates to the horizontal direction of FIG. 6, FIG.

  The light shielding wall 726 shown in FIG. 8 is connected to the semi-cylindrical portion 723. The light shielding wall 726 overlaps the end portion 713a and the end portion 723a in the circumferential direction of the tube 4. Unlike the present embodiment, the light shielding wall 726 may not be connected to the semi-cylindrical part 723 but may be connected to the semi-cylindrical part 713.

  As shown in FIG. 5, the protruding portion 727 is connected to the semi-cylindrical portion 723. The protruding portion 727 protrudes from the semi-cylindrical portion 723 toward the support member 1. In the present embodiment, the protruding portion 727 is fitted in the through hole 139 a of the heat radiating member 13.

  As shown in FIG. 5, a hole 727 a is formed in the second member 72 of the cap 7. The hole 727 a is a second hole and is formed in the protruding portion 727. The hole 727a opens toward the hole 717a of the protrusion 717. The hole 727 a communicates with the hole 717 a of the protrusion 717.

  As shown in FIG. 5, the screw 61 is inserted into the holes 717a and 727a. As a result, the first member 71 is fixed to the second member 72. As described above, the support member 1 (heat radiating member 13) is in contact with the protruding portion 717 of the first member 71. Therefore, a force directed from the protrusion 717 to the support member 1 toward the second member 72 acts. As described above, the support member 1 (heat radiating member 13) is in contact with the semi-cylindrical portion 723 of the second member. Therefore, a force from the semi-cylindrical portion 723 toward the first member 71 acts on the support member 1. As described above, the force directed from the protruding portion 717 toward the second member 72 acts on the support member 1 and the force directed from the semi-cylindrical portion 723 toward the first member 71 acts on the support member 1. Is sandwiched between the protruding portion 717 and the semi-cylindrical portion 723.

  As shown in FIGS. 1 to 3, the cap 8 is located at the end of the tube 4 on the direction X <b> 2 side. The cap 8 has a configuration substantially similar to the configuration of the cap 7. The cap 8 closes the opening of the tube 4 on the direction X2 side. The cap 8 is fixed to the support member 1. On the other hand, there is a slight gap between the cap 8 and the tube 4. Therefore, the cap 8 is in partial contact with the tube 4 but is not fixed to the tube 4. The cap 8 is made of, for example, resin, ceramic, or metal. In the present embodiment, the cap 8 is made of resin. A grounding terminal 32 protrudes from the cap 8. In the present embodiment, the cap 8 includes a first member 81 and a second member 82. The first member 81 and the second member 82 are each integrally molded. Unlike the present embodiment, the entire cap 8 may be integrally molded.

  FIG. 11 is a partially enlarged view of FIG. 12 is a cross-sectional view taken along line XII-XII in FIG. 13 is a cross-sectional view taken along line XIII-XIII in FIG. FIG. 14 is an exploded perspective view of the cap 8 shown on the right side of FIG. FIG. 15 is a plan view of the first member 81 of the cap 8 shown in FIG. FIG. 16 is a plan view of the second member 82 of the cap 8 shown in FIG.

  As shown in FIGS. 11 to 15, the first member 81 includes a semi-cylindrical part 811 (first semi-cylindrical part), a semi-cylindrical part 813 (third semi-cylindrical part), and a light shielding wall 815 ( A first light shielding wall), a protrusion 817 (first protrusion), and a support wall 818;

  The cross-sectional shape of the semi-cylindrical portion 811 is a concave shape that opens in one direction. In the present embodiment, the semi-cylindrical portion 811 has a semi-cylindrical shape. The semi-cylindrical portion 811 has an end portion 811a. Each end portion 811 a is a first end portion, and is located at the end in the circumferential direction of the tube 4 in the semi-cylindrical portion 811. The end portions 811a face in the same direction (downward direction in FIG. 13). The semi-cylindrical part 813 is connected to the semi-cylindrical part 811. As shown in FIG. 11, the semi-cylindrical portion 813 is located on the direction X2 side with respect to the semi-cylindrical portion 811 in the direction X. The cross-sectional shape of the semi-cylindrical portion 813 is a concave shape that opens in one direction. In the present embodiment, the semi-cylindrical portion 813 has a semi-cylindrical shape. The thickness of the semi-cylindrical portion 813 (dimension in the radial direction of the tube 4) is larger than the thickness of the semi-cylindrical portion 811 (dimension in the radial direction of the tube 4). The semi-cylindrical portion 813 has an end portion 813a. Each end 813 a is a third end, and is located at the end of the tube 4 in the circumferential direction. The end portions 813a face in the same direction (downward direction in FIG. 12).

  The light shielding wall 815 stands up from the semi-cylindrical portion 811 toward the axis Ox when viewed in the direction X. The light shielding wall 815 faces the light passage space 45. As shown in FIG. 11, the light shielding wall 815 overlaps the support member 1 in the direction X. The light shielding wall 815 extends along a plane perpendicular to the axis Ox. As shown in FIG. 14, in this embodiment, the light shielding wall 815 is connected to the semi-cylindrical portion 811 over the entire inner surface of the semi-cylindrical portion 811 in the circumferential direction of the tube 4.

  As shown in FIG. 11, the protruding portion 817 is connected to the semi-cylindrical portion 813. The protruding portion 817 protrudes from the semi-cylindrical portion 813 toward the support member 1. The protruding portion 817 is in direct contact with the support member 1.

  As shown in FIG. 11, a hole 817 a and a hole 817 b are formed in the first member 81 of the cap 8. The hole 817 a is a first hole and is formed in the protruding portion 817. The hole 817a opens toward the through hole 139b of the heat dissipation member 13. The hole 817 b is formed in the protruding portion 817 and the semi-cylindrical portion 813. The hole 817b communicates with the hole 817a and opens toward the side opposite to the side where the support member 1 is located.

  As shown in FIG. 11, the support wall 818 is connected to the light shielding wall 815. The support wall 818 has an abutting portion 818a that abuts against the support member 1 (in this embodiment, the heat dissipation member 13). The contact portion 818a is separated from the protruding portion 817 in the direction X in the direction from the light shielding wall 815 to any of the plurality of LED chips 21. That is, as shown in FIG. 11, the contact portion 818a is located on the direction X1 side with respect to the protruding portion 817.

  As shown in FIGS. 11 to 14 and 16, the second member 82 includes a semi-cylindrical portion 821 (second semi-cylindrical portion), a semi-cylindrical portion 824 (fourth semi-cylindrical portion), and a light shielding. It has a wall 826 (third light shielding wall) and a protruding portion 827 (second protruding portion).

  The cross-sectional shape of the semi-cylindrical portion 821 is a concave shape that opens in one direction. In the present embodiment, the semi-cylindrical portion 821 has a semi-cylindrical shape. The semi-cylindrical part 821 has an end part 821a. Each end portion 821 a is a second end portion, and is located at the end of the semi-cylindrical portion 821 in the circumferential direction of the tube 4. The end portions 821a face in the same direction (upward direction in FIG. 13). The end portion 821a faces the end portion 811a. A semi-cylindrical part 811 surrounds the tube 4 together with the semi-cylindrical part 821. The semi-cylindrical part 823 is connected to the semi-cylindrical part 821. As shown in FIG. 11, the semi-cylindrical portion 823 is located on the direction X2 side with respect to the semi-cylindrical portion 821 in the direction X. The cross-sectional shape of the semi-cylindrical portion 823 is a concave shape that opens in one direction. In the present embodiment, the semi-cylindrical portion 823 has a semi-cylindrical shape. The thickness of the semi-cylindrical portion 823 (dimension in the radial direction of the tube 4) is larger than the thickness of the semi-cylindrical portion 821 (dimension in the radial direction of the tube 4). The semi-cylindrical portion 823 is in contact with the support member 1 (the heat radiating member 13 in the present embodiment). The semi-cylindrical portion 823 has an end portion 823a. Each end portion 823a is located at an end of the tube 4 in the circumferential direction. The end portions 823a face in the same direction (upward direction in FIG. 12). The end portion 823a faces the end portion 813a. The semi-cylindrical portion 823 is formed with a recess 823b. The support member 1 (in this embodiment, the heat radiating member 13) is fitted in each recess 823b. Thereby, it can prevent that the supporting member 1 shifts | deviates to the horizontal direction of FIG. 12, FIG.

  The light shielding wall 826 is connected to the semi-cylindrical portion 823. The light shielding wall 826 overlaps the end portion 813 a and the end portion 823 a in the circumferential direction of the tube 4. Unlike the present embodiment, the light shielding wall 826 may not be connected to the semi-cylindrical part 823 but may be connected to the semi-cylindrical part 813.

  As shown in FIG. 11, the protruding portion 827 is connected to the semi-cylindrical portion 823. The protruding portion 827 protrudes from the semi-cylindrical portion 823 toward the support member 1. In the present embodiment, the protruding portion 827 is fitted in the through hole 139 b of the heat radiating member 13.

  As shown in FIG. 11, a hole 827 a is formed in the second member 82 of the cap 8. The hole 827 a is a second hole and is formed in the protruding portion 827. The hole 827a opens toward the hole 817a of the protrusion 817. The hole 827 a communicates with the hole 817 a of the protrusion 817.

  As shown in FIG. 11, screws 62 are inserted into the holes 817a and 827a. As a result, the first member 81 is fixed to the second member 82. As described above, the support member 1 (heat radiating member 13) is in contact with the protruding portion 817 of the first member 81. Therefore, a force directed from the protruding portion 817 toward the second member 82 acts on the support member 1. As described above, the support member 1 (heat radiating member 13) is in contact with the semi-cylindrical portion 823 of the second member. Therefore, a force from the semi-cylindrical portion 823 toward the first member 81 acts on the support member 1. As described above, the force directed from the protruding portion 817 toward the second member 82 acts on the support member 1, and the force directed from the semi-cylindrical portion 823 toward the first member 81 acts on the support member 1. Is sandwiched between the protruding portion 817 and the semi-cylindrical portion 823.

  Next, a manufacturing method of the LED lamp 101 will be briefly described with reference to FIGS.

  First, the LED module 2 including the plurality of LED chips 21 shown in FIG. Next, the substrate 11 and the LED module 2 are disposed on the heat dissipation member 13. Next, the LED module 2, the substrate 11, and the heat dissipation member 13 are accommodated in the tube 4. Next, the heat dissipation member 13 and the tube 4 are bonded. Adhesion between the heat radiating member 13 and the tube 4 is achieved by moving the opening 631 of at least one nozzle 63 between the heat radiating member 13 and the tube 4 along the direction X in the left direction in FIG. The adhesive 59 is discharged from the container. As shown in FIG. 20, in this embodiment, the opening 631 is moved in a state where each nozzle 63 is fitted in one of the plurality of grooves 131 formed in the heat radiating member 13. After the heat dissipation member 13 and the tube 4 are bonded, the caps 7 and 8 are attached to the tube 4. The LED lamp 101 is manufactured through the above steps.

  When the LED lamp 101 is used, a current flows through the LED chip 21 via the circuit component 31. When an electric current flows through the LED chip 21, the LED chip 21 emits light. The light emitted from the LED chip 21 passes through the light passage space 45 in the tube 4 and reaches the tube 4 and the caps 7 and 8. Then, light is emitted from the tube 4 and the caps 7 and 8. On the other hand, when a current flows through the LED chip 21, heat is generated in the LED chip 21. The heat generated in the LED chip 21 is mainly transmitted to the tube 4 via the substrate 11, the heat radiating member 13, and the adhesive layer 5. The heat transmitted to the tube 4 is released to the outside of the tube 4. In this way, the heat generated in the LED chip 21 is released to the outside of the LED lamp 101.

  Next, the function and effect of this embodiment will be described.

  The LED lamp 101 includes an adhesive layer 5. The adhesive layer 5 is interposed between the heat dissipation member 13 and the tube 4 and adheres the heat dissipation member 13 and the tube 4. According to such a configuration, heat can be transmitted from the heat dissipation member 13 to the tube 4 via the adhesive layer 5. Generally, the thermal conductivity of the material constituting the adhesive layer 5 is larger than the thermal conductivity of air, which is a gas. Therefore, the LED lamp 101 is suitable for efficiently transferring heat from the heat radiating member 13 to the tube 4. Therefore, the heat generated in the LED chip 21 can be efficiently discharged to the outside of the LED lamp 101 without being excessively retained in the heat radiating member 13 or in the space between the heat radiating member 13 and the tube 4. it can.

  When a certain amount of time elapses after the LED chip 21 is energized, the temperature of the portion of the heat dissipation member 13 that contacts the adhesive layer 5 and the temperature of the portion of the tube 4 that contacts the adhesive layer 5 become substantially the same. That is, the temperature increased from the start of energization of the LED chip 21 is substantially the same in the portion of the heat dissipation member 13 where the adhesive layer 5 contacts and the portion of the tube 4 where the adhesive layer 5 contacts. In the LED lamp 101, the tube 4 is made of a material having a linear expansion coefficient larger than the linear expansion coefficient of the material constituting the heat dissipation member 13. That is, the linear expansion coefficient of the material forming the heat dissipation member 13 is smaller than the linear expansion coefficient of the material forming the tube 4. Therefore, when the LED lamp 101 is used, the heat dissipation member 13 is less likely to expand than the tube 4. Therefore, even if the tube 4 is about to expand, the tube 4 is pulled from the adhesive layer 5 that is in contact with the heat radiating member 13 that is difficult to expand, and thus is difficult to expand. Therefore, the expansion | swelling of the site | part which the contact bonding layer 5 contacts among the tubes 4 can be suppressed.

  In the LED lamp 101, the plurality of LED chips 21, the heat radiating member 13, and the adhesive layer 5 are all surrounded by the tube 4 and a virtual plane 891 passing through the axis Ox in the space defined by the tube 4. It is accommodated in any one of the two spaces partitioned by. According to such a configuration, since the adhesive layer 5 is in contact with the portion 48 in FIG. 4, much heat is easily transmitted through the adhesive layer 5, and not much heat is transmitted to the portion 49 in FIG. 4. If it does so, the temperature of the site | part 48 will become very high compared with the temperature of the site | part 49. FIG. As a result, the temperatures of the portions 48 and 49 on the opposite sides across the axis Ox in the tube 4 are greatly different. In the present embodiment, since the adhesive layer 5 is in contact with the part 48, the expansion of the part 48 in the direction X is suppressed. Therefore, even if the temperature of the part 48 is much higher than the temperature of the part 49, the degree of expansion of the parts 48 and 49 in the direction X is not so different. Therefore, according to the LED lamp 101, the deflection of the tube 4 can be suppressed.

  In the LED lamp 101, a groove 131 extending along the direction X is formed in the heat dissipation member 13. An adhesive layer 5 is formed in the groove 131. When manufacturing such an LED lamp 101, as described with reference to FIGS. 19 and 20, the groove 131 can be used as a space in which the nozzle 63 is disposed. Then, the nozzle 63 can be moved along the groove 131, and the opening 631 of the nozzle 63 can be easily moved along the direction X. Moving the opening 631 along the direction X is suitable for forming the adhesive layer 5 in a shape extending along the direction X.

  In the LED lamp 101, the cap 7 has a light shielding wall 715 that stands up from the semi-cylindrical portion 711 toward the axis Ox of the tube 4 in the direction X. The light shielding wall 715 faces the light passage space 45 through which the light emitted from the LED chip 21 passes. According to such a configuration, when the LED lamp 101 is used, light that has passed through the light passage space 45 is emitted from a portion of the cap 7 that is located on the direction X2 side with respect to the light shielding wall 715. Therefore, when the LED lamp 101 is used, a portion of the cap 7 that is located on the direction X2 side with respect to the light shielding wall 715 is relatively bright. On the other hand, the light that has passed through the light passage space 45 is blocked by the light shielding wall 715 before reaching the portion of the cap 7 that is located on the direction X1 side with respect to the light shielding wall 715. Therefore, when the LED lamp 101 is used, it is difficult for light to be emitted from a portion of the cap 7 located on the direction X1 side with respect to the light shielding wall 715, and the portion is extremely dark. That is, when the LED lamp 101 is used, a portion of the cap 7 that is located on the direction X2 side with respect to the light shielding wall 715 is relatively bright, and a portion that is located on the direction X1 side with respect to the light shielding wall 715 is extremely dark. As described above, the boundary between the bright part and the dark part in the cap 7 when the LED lamp 101 is used can be clarified. If the boundary between the bright part and the dark part in the cap 7 is clear, even if the LED lamp 101 is used as an alternative to the straight tube type fluorescent lamp that has been conventionally used, it is difficult for the user to feel uncomfortable.

  In the LED lamp 101, the cap 7 includes a protruding portion 717 that is connected to the semi-cylindrical portion 713 and protrudes from the semi-cylindrical portion 713 toward the support member 1. The support member 1 is sandwiched between the protruding portion 717 and the semi-cylindrical portion 723. According to such a structure, it can suppress that the supporting member 1 shifts | deviates to the up-down direction of FIG.

  In the LED lamp 101, the cap 7 includes a protruding portion 727 that is connected to the semi-cylindrical portion 723 and protrudes from the semi-cylindrical portion 723 toward the support member 1. A hole 717 a that opens toward the through hole 139 a is formed in the protruding portion 717. A hole 727a that opens toward the hole 717a is formed in the protruding portion 727. In such a configuration, the holes 717 a and 727 a are used as screw holes for inserting the screws 61. When the screw 61 is inserted into the hole 717a and the hole 727a, the protrusion 717 in which the hole 717a is formed can be firmly fixed to the protrusion 727 in which the hole 727a is formed. Then, the protruding portion 717 can be firmly fixed to the semi-cylindrical portion 723 connected to the protruding portion 727. Therefore, the protruding portion 717 and the semi-cylindrical portion 723 can firmly hold the support member 1. This is more suitable for suppressing the support member 1 from shifting in the vertical direction of FIG.

  In the LED lamp 101, the protruding portion 727 is fitted in the through hole 139a. According to such a configuration, the protruding portion 727 can be used as a positioning member for defining the position of the support member 1 in the cap 7.

  In the LED lamp 101, the cap 7 includes a contact portion 718 a that contacts the support member 1. The contact portion 718a is separated from the protruding portion 717 in the direction X from the light shielding wall 715 toward one of the plurality of LED chips 21. According to such a structure, it can suppress that the right end part of FIG. 3 in the supporting member 1 inclines to the upper side of the figure.

  The cap 7 includes a light shielding wall 726 that overlaps the end 713a and the end 723a in the circumferential direction of the tube 4. Each of the semi-cylindrical parts 713 and 723 is thicker than each thickness of the semi-cylindrical parts 711 and 721. The light shielding wall 726 overlaps one of the semi-cylindrical portions 713 and 723 in the radial direction of the tube. According to such a configuration, the light emitted from the LED chip 21 is blocked by the light shielding wall 726 before reaching the gap between the end portion 713a and the end portion 723a. Therefore, light can be prevented from leaking out of the cap 7 through the gap between the end 713a and the end 723a.

  The advantages obtained with the cap 7 are also obtained with the cap 8.

  21 to 31 show another embodiment of the present invention. In these drawings, the same or similar elements as those in the above embodiment are denoted by the same reference numerals as those in the above embodiment.

Second Embodiment
Next, a second embodiment of the present invention will be described with reference to FIGS.

  FIG. 21 is a bottom view of the LED lamp according to the present embodiment. 22 is a cross-sectional view taken along line XXII-XXII shown in FIG.

  The LED lamp 102 shown in these drawings includes a support member 1, an LED module 2, a circuit component 31, a ground terminal 32, a tube 4, an adhesive layer 5, and caps 7 and 8. In the LED lamp 102, except for the support member 1, the configurations of the LED module 2, the circuit component 31, the ground terminal 32, the tube 4, the adhesive layer 5, and the caps 7 and 8 are the same as those in the LED lamp 101. The description will be omitted.

  The support member 1 includes a substrate 11, a wiring pattern (not shown), and a heat dissipation member 13. Since the substrate 11 and the wiring pattern are the same as those in the above-described embodiment, description thereof is omitted. The heat dissipating member 13 has outer surfaces 136 and 137. A groove 131 and two grooves 134 are formed in the heat dissipation member 13.

  The outer surface 136 is a first outer surface, and is along the circumferential direction and the axial direction (direction X) of the tube 4. The grooves 131 and 134 are recessed from the outer surface 136. Each outer surface 137 is a second outer surface, and is along the circumferential direction and the axial direction (direction X) of the tube 4. Each outer surface 137 is connected to one of the two grooves 134. A groove 134 is located between the outer surface 137 and the outer surface 136. That is, each outer surface 137 is located on the opposite side to the outer surface 136 with respect to any one of the two grooves 134.

  The groove 131 is a first groove and extends along the direction X. In the present embodiment, the groove 131 is formed from one end to the other end in the direction X of the heat dissipation member 13. The groove 131 is defined by the groove surface 132. Each groove 134 is a second groove and extends along the direction X. In the circumferential direction of the tube 4, the groove 131 is located between the two grooves 134. Further, the grooves 131 are separated from the grooves 134 in the circumferential direction of the tube 4. In the present embodiment, each groove 134 is formed from one end to the other end in the direction X of the heat dissipation member 13. The dimension of the groove 134 in the circumferential direction of the tube 4 is smaller than the dimension of the groove 131 in the circumferential direction of the tube 4. Each groove 134 is defined by a groove surface 135.

  An adhesive layer 5 is formed in the grooves 131 and 134 and the outer surface 136. That is, the groove surfaces 132 and 135 and the outer surface 136 are in direct contact with the adhesive layer 5. On the other hand, the adhesive layer 5 is not formed on the outer surface 137. The outer surface 137 is exposed from the adhesive layer 5 throughout. The edge 53 of the adhesive layer 5 overlaps the groove 134 in the circumferential direction of the tube 4.

  In the LED lamp 102, the heat radiating member 13 has an outer surface 136 along the circumferential direction and the axial direction of the tube 4. The adhesive layer 5 is in contact with the outer surface 136, and the groove 131 is recessed from the outer surface 136. Such a configuration is suitable for increasing the area of the heat dissipation member 13 that is close to the inner surface of the tube 4. This is suitable for facilitating the transfer of heat from the heat dissipation member 13 to the tube 4.

  In the LED lamp 102, a groove 134 that is recessed from the outer surface 136 and extends in the direction X is formed. The groove 131 is separated from the groove 134 in the circumferential direction of the tube 4. The adhesive layer 5 is formed in the groove 134. The adhesive layer 5 of the LED lamp 102 having such a configuration is formed by applying the adhesive 59 to the outer surface 136 and the groove 131. When the adhesive 59 is applied to the outer surface 136 and the groove 131, the adhesive 59 enters the groove 134. Therefore, the adhesive layer 5 is formed over the entire outer surface 136, but is difficult to form on the outer surface 137. Therefore, the edge 53 of the adhesive layer 5 can be formed straight along the direction X. The adhesive layer 5 may be slightly visible from the outside of the tube 4. Therefore, when the edge 53 is straight, an impression that the appearance is good can be given.

<Third Embodiment>
Next, a third embodiment of the present invention will be described with reference to FIG.

  FIG. 23 is a cross-sectional view of the LED lamp according to the present embodiment.

  The LED lamp 103 shown in the figure is different from that in the LED lamp 102 in the cross-sectional shape of the groove 131. In the LED lamp 103, the groove surface 132 has a portion that is separated from the adhesive layer 5 via a gap. Such a configuration is suitable for reducing the heat radiation member 13.

<Fourth embodiment>
Next, a fourth embodiment of the present invention will be described with reference to FIGS.

  FIG. 24 is an exploded cross-sectional view of the LED lamp according to the present embodiment. 25 is a cross-sectional view taken along line XXV-XXV in FIG.

  The LED lamp 104 shown in these drawings is different from the LED lamp 101 in that a plurality of hollow portions 138 are formed in the heat dissipation member 13. Each cavity 138 extends along the direction X. In the present embodiment, each cavity 138 opens to the direction X1 side and the direction X2 side. Each cavity 138 has a long rectangular cross-sectional shape by a plane orthogonal to the axis Ox. Each cavity 138 has a shape extending in a direction from the axis Ox toward the adhesive layer 5 in the direction X. The plurality of cavities 138 are arranged along a direction perpendicular to the direction X from the axis Ox toward the adhesive layer 5 and the direction X. The heat radiating member 13 has a dimension in a direction orthogonal to the direction X from the axis Ox toward the adhesive layer 5 and the direction X rather than a dimension in a direction from the axis Ox toward the adhesive layer 5.

  Forming the plurality of hollow portions 138 in the heat dissipation member 13 with the LED lamp 104 is suitable for making the heat dissipation member 13 lighter.

  In the LED lamp 104, each cavity 138 has a shape extending in a direction from the axis Ox toward the adhesive layer 5 in the direction X. According to such a configuration, the heat generated in the LED chip 21 can be transmitted to the adhesive layer 5 with almost no bypass of the cavity 138. Thereby, the heat generated in the LED chip 21 can be efficiently transmitted to the adhesive layer 5. Therefore, the heat generated in the LED chip 21 can be efficiently discharged to the outside of the LED lamp 104.

  In this embodiment, although the cavity part 138 showed the example formed in the heat radiating member 13 of the LED lamp 101, the cavity part 138 may be formed in the heat radiating member 13 in LED lamp 102,103.

<Fifth Embodiment>
Next, a fifth embodiment of the present invention will be described with reference to FIGS.

  FIG. 26 is a bottom view of the LED lamp according to the present embodiment. 27 is a cross-sectional view taken along line XXVII-XXVII in FIG.

  The LED lamp 105 shown in these drawings is different from the above-described LED lamp 102 in that the tube 4 includes the protruding portion 44. The protruding portion 44 protrudes from the outer cylinder portion 41 toward the axis Ox. The protrusion 44 has a shape extending along the direction X. The protruding portion 44 is fitted in the groove 131. The adhesive layer 5 is interposed between the protruding portion 44 and the groove 131 (or the groove surface 132).

  Such a configuration is suitable for increasing the area where the tube 4 and the adhesive layer 5 are in contact with each other. When the area where the tube 4 and the adhesive layer 5 are in contact with each other is large, the adhesive force between the tube 4 and the adhesive layer 5 is increased. Therefore, even if the tube 4 expands, the adhesive layer 5 is difficult to peel off from the tube 4. This is suitable for improving the reliability of the LED lamp 105.

<Sixth Embodiment>
Next, a sixth embodiment of the present invention will be described with reference to FIG.

  FIG. 28 is a bottom view of the LED lamp according to the present embodiment.

    The LED lamp 106 shown in the figure is different from the above-described LED lamp 105 in that the protrusion 44 has a plurality of strips 441. The strips 441 are spaced apart from each other along the direction X.

  According to such a configuration, the thickness (the dimension in the radial direction of the tube 4) of the portion of the adhesive layer 5 where the strip 131 is not present in the groove 131 is relatively large. Therefore, even when the tube 4 expands and the adhesive layer 5 is pulled by the heat radiating member 13 and the tube 4, the adhesive layer 5 is not easily divided. This is suitable for improving the reliability of the LED lamp 106.

<Seventh embodiment>
Next, a seventh embodiment of the present invention will be described with reference to FIGS.

  FIG. 29 is an exploded perspective view showing the cap 7 of the LED lamp according to the present embodiment. FIG. 30 is a cross-sectional view of the LED lamp according to the present embodiment. FIG. 31 is an exploded perspective view showing the cap 8 of the LED lamp according to the present embodiment. FIG. 30 corresponds to FIG.

  In the LED lamp of the present embodiment, the first member 71 of the cap 7 has a light shielding wall 716 (second light shielding wall), and the first member 81 of the cap 8 has a light shielding wall 816 (second light shielding wall). , Different from the LED lamp 101 described above.

  The light shielding walls 716 and 816 face the above-described light passage space 45 formed in the tube 4. The light shielding wall 716 overlaps the end portion 711 a and the end portion 721 a in the circumferential direction of the tube 4. In the present embodiment, the light shielding wall 716 is connected to the support wall 718. Unlike the present embodiment, the light shielding wall 716 may be connected to the light shielding wall 715 instead of being connected to the support wall 718.

  According to such a configuration, the light emitted from the LED chip 21 is blocked by the light shielding wall 716 before reaching the gap between the end portion 711a and the end portion 721a. Therefore, light can be prevented from leaking out of the cap 7 from the gap between the end 711a and the end 721a. Similarly, light can be prevented from leaking out of the cap 8 from the gap between the end portion 811a and the end portion 821a.

  The present invention is not limited to the embodiment described above. The specific configuration of each part of the present invention can be changed in various ways.

101 to 107 LED lamp 1 support member 11 substrate 13 heat radiating member 13a base portion 13b, 13c convex portion 131 (first) groove 132 groove surface 134 (second) groove 135 groove surface 136 (first) outer surface 137 (second) outer surface 138 Cavity 139a, 139b Through-hole 2 LED module 21 LED chip 22 Sealing resin 25A, 25B Lead 26 Reflector 31 Circuit component 311 Substrate 312 Diode bridge 312a, 312b Input terminal 312c, 312d Output terminal 313 Resistance 314 Fuse 315 AC / DC Converter 316 Terminal 32 Ground terminal 4 Tube 41 Outer cylinder part 42, 43 Projection piece 44 Projection part 441 Strip-like piece 45 Light passage space 5 Adhesive layer 51 Resin part 52 Filler 53 Edge 59 Adhesive 61, 62 Screw 63 Nozzle 631 Opening 7 Cap 71 Part 1 711 (first) semi-cylindrical portion 711a (first) end 713 (third) semi-cylindrical portion 713a (third) end 715 (first) light shielding wall 716 (second) light shielding wall 717 (first ) Protruding portion 717a (First) hole 717b Hole 718 Support wall 718a Abutting portion 72 (Second) member 721 (Second) Semi-cylindrical portion 721a (Second) End portion 723 (Fourth) Semi-cylindrical portion 723a (Fourth) end 723b dent 726 (third) light shielding wall 727 (second) protrusion 727a (second) hole 8 cap 81 first member 811 (first) semi-cylindrical portion 811a (first) end 813 (third) semi-cylindrical portion 813a (third) end 815 (first) light shielding wall 816 (second) light shielding wall 817 (first) protrusion 817a (first) hole 817b hole 818 support wall 818a Contact part 82 (second) member (lower side)
821 (second) semi-cylindrical part 821a (second) end 823 (fourth) semi-cylindrical part 823a (fourth) end 823b dent 826 (third) light shielding wall 827 (second) projecting part 827a ( 2) Hole

Claims (27)

Tubes,
Including a heat dissipation member extending in the axial direction of the tube, and a support member accommodated in the tube;
A plurality of LED chips housed in the tube and supported by the support member;
An adhesive layer interposed between the heat dissipating member and the tube and adhering the heat dissipating member and the tube ,
The tube is ing than the material of the large linear thermal expansion coefficient than the material forming the heat radiating member, LED lamps. The plurality of LED chips, the heat dissipation member, and the adhesive layer are all surrounded by an imaginary plane passing through the axis of the tube in the space surrounded by the tube and defined by the tube. The LED lamp according to claim 1 , which is housed in any one of the two spaces. The adhesive layer is a shape extending along the axial direction, LED lamp according to claim 1 or 2. The heat dissipation member is formed with a first groove extending along the axial direction,
Above the first groove, the adhesive layer is formed, LED lamp according to any one of claims 1 to 3. The heat dissipation member has a first outer surface along the circumferential direction of the tube and the axial direction,
The LED lamp according to claim 4 , wherein the adhesive layer is in contact with the first outer surface, and the first groove is recessed from the first outer surface. Tubes,
Including a heat dissipation member extending in the axial direction of the tube, and a support member accommodated in the tube;
A plurality of LED chips housed in the tube and supported by the support member;
An adhesive layer interposed between the heat dissipating member and the tube and adhering the heat dissipating member and the tube.
The heat dissipation member is formed with a first groove extending along the axial direction,
The adhesive layer is formed in the first groove,
The heat dissipation member has a first outer surface along the circumferential direction of the tube and the axial direction,
The adhesive layer is in contact with the first outer surface, the first groove is recessed from the first outer surface,
The heat radiating member is formed with a second groove that is recessed from the first outer surface and extends along the axial direction. The first groove is separated from the second groove in the circumferential direction of the tube, and the adhesive layer is formed in the second groove, LED lamps. The heat dissipating member has a second outer surface connected to the second groove, and the second outer surface is located on the side opposite to the first surface with respect to the second groove, and the adhesive layer is entirely formed. The LED lamp according to claim 6 exposed from the above. The heat dissipation member has a groove surface that defines the first groove,
The Mizomen has a portion spaced with a gap from the adhesive layer, LED lamp according to any one of claims 4 to 7. The LED lamp according to any one of claims 1 to 8, wherein a hollow portion extending in the axial direction is formed in the heat dissipation member. Tubes,
Including a heat dissipation member extending in the axial direction of the tube, and a support member accommodated in the tube;
A plurality of LED chips housed in the tube and supported by the support member;
An adhesive layer interposed between the heat dissipating member and the tube and adhering the heat dissipating member and the tube.
The heat dissipation member is formed with a cavity extending in the axial direction,
The hollow portion is open in the axial direction , the LED lamp. The hollow portion has a long rectangular cross-sectional shape by a surface orthogonal to the axial direction, and the hollow portion has a shape extending in a direction from the axis of the tube toward the adhesive layer when viewed in the axial direction. Item 11. The LED lamp according to Item 10 . The adhesive layer includes a resin part and a filler mixed in the resin part, and the filler is made of a material having a thermal conductivity larger than a thermal conductivity of a material constituting the resin part. The LED lamp according to any one of 1 to 11 . The LED lamp according to claim 12 , wherein the resin portion is made of a silicone-based material. The tube includes an outer cylinder part having a circular cross section, and a protruding part protruding from the outer cylinder part,
The protruding portion, the first and fits into the groove, the adhesive layer is interposed between the projecting portion and the first groove, LED lamp according to any one of claims 4 to 13. The LED lamp according to claim 14 , wherein the projecting portion has a plurality of strips spaced apart along the axial direction. A cap including a first semi-cylindrical part and a second semi-cylindrical part,
The tube is formed with a light passage space through which light emitted from each LED chip passes,
The first semi-cylindrical part surrounds the tube together with the second semi-cylindrical part,
The cap has a first light shielding wall that stands up from the first semi-cylindrical portion toward the axis of the tube in the axial view of the tube,
The first light-shielding wall, faces the said light passing space, and, overlapping the support member in the axial direction, LED lamp according to any one of claims 1 to 15. The first semi-cylindrical portion has a first end located at an end in the circumferential direction of the tube, and the second semi-cylindrical portion has a second end located at an end in the circumferential direction. The LED lamp according to claim 16 , wherein the first end portion is opposed to the second end portion. The LED lamp according to claim 17 , wherein the cap has a second light shielding wall that faces the light passage space and overlaps the first end and the second end in the circumferential direction. Tubes,
Including a heat dissipation member extending in the axial direction of the tube, and a support member accommodated in the tube;
A plurality of LED chips housed in the tube and supported by the support member;
An adhesive layer interposed between the heat dissipating member and the tube and adhering the heat dissipating member and the tube.
A cap including a first semi-cylindrical part and a second semi-cylindrical part,
The tube is formed with a light passage space through which light emitted from each LED chip passes,
The first semi-cylindrical part surrounds the tube together with the second semi-cylindrical part,
The cap has a first light shielding wall that stands up from the first semi-cylindrical portion toward the axis of the tube in the axial view of the tube,
The first light shielding wall faces the light passage space and overlaps the support member in the axial direction;
The cap includes a third semi-cylindrical part connected to the first semi-cylindrical part, and a fourth semi-cylindrical part connected to the second semi-cylindrical part,
The third semi-cylindrical part has a third end located at the end in the circumferential direction, the fourth semi-cylindrical part has a fourth end located at the end in the circumferential direction, The third end portion is opposed to the fourth end portion , an LED lamp. The cap includes a first projecting portion connected to the third semi-cylindrical portion and projecting from the third semi-cylindrical portion toward the support member,
The LED lamp according to claim 19 , wherein the support member is sandwiched between the first projecting portion and the fourth semi-cylindrical portion. The cap includes a second projecting portion connected to the fourth semi-cylindrical portion and projecting from the fourth semi-cylindrical portion toward the support member,
A through hole is formed in the support member, a first hole opening toward the through hole is formed in the first projecting portion, and a first hole is formed in the second projecting portion. The LED lamp of Claim 20 in which the 2nd hole opened toward the direction is formed. The LED lamp according to claim 21 , wherein the second protrusion is fitted in the through hole. The cap includes an abutting portion that abuts on the support member, and the abutting portion is arranged in a direction from the first light shielding wall toward one of the plurality of LED chips in the axial direction of the tube. The LED lamp according to any one of claims 20 to 22 , wherein the LED lamp is separated from one protrusion. The cap has a third light shielding wall that overlaps the third end and the fourth end in the circumferential direction,
The third semi-cylindrical part and the fourth semi-cylindrical part are both thicker than the first semi-cylindrical part and the second semi-cylindrical part. The LED lamp according to any one of claims 19 to 23 , wherein the LED lamp overlaps with any one of the third semi-cylindrical part and the fourth semi-cylindrical part in a radial direction. The third semi-cylindrical part and the fourth semi-cylindrical part are both thicker than the thickness of the first semi-cylindrical part and the second semi-cylindrical part. The LED lamp according to any one of claims 19 to 23, wherein a recess into which the support member is fitted is formed. It further comprises a circuit component housed in the cap,
The circuit component includes a diode bridge having two input terminals and two output terminals, and a resistor electrically interposed between the two input terminals, and the plurality of LED chips include the two output terminals. The LED lamp according to any one of claims 16 to 25 , which is electrically interposed between the two. 27. The LED lamp according to claim 26 , wherein the circuit component includes an AC / DC converter that converts an input commercial AC voltage into a DC voltage .

Images