WO2013105160A1

WO2013105160A1 - Lamp

Info

Publication number: WO2013105160A1
Application number: PCT/JP2012/006627
Authority: WO
Inventors: 隆在植本; 三貴　政弘; 永井　秀男; 美都子首藤; 高橋　健治
Original assignee: パナソニック株式会社
Priority date: 2012-01-11
Filing date: 2012-10-17
Publication date: 2013-07-18
Also published as: JPWO2013105160A1; JP5347085B1; CN107076367A

Abstract

This lamp (1) is provided with: light-emitting units (11); an elongated heat transmission member (21) that transmits heat generated at the light-emitting units (11); and an elongated cover (31) that houses the light-emitting units (11) and the heat transmission member (21). Also, the heat transmission member (21) has: a flat plate section (22) that is formed into a slender flat plate, and that is such that the light-emitting units (11) are disposed at a disposing surface (22a) side in the thickness direction; a curved plate section (23) that, at the reverse side from the disposing surface (22a) of the flat plate section (22), bridges between the two edges in the widthwise direction of the flat plate section (22), and is curved in a manner so as to contact along the inner peripheral surface of the cover (31); and a bridge section (thermal coupling section) (25) that is positioned within the space enclosed by the flat plate section (22) and the curved plate section (23), and that thermally couples the flat plate section (22) and the curved plate section (23).

Description

lamp

The present invention relates to a lamp, and more particularly to heat dissipation improvement.

In recent years, in order to reduce the frequency of replacement due to the lifetime and to save power, a straight tube type lamp using an LED that has a longer life and consumes less power than a straight tube fluorescent lamp has been developed (see Patent Document 1) ).

FIG. 17 shows an example of a straight tube lamp 2001 using this type of LED. FIG. 17 is a cross-sectional view of the lamp 2001 taken along a plane orthogonal to the longitudinal direction.

In the lamp 2001, the light emitting unit 2011 having the LED mounted thereon is disposed on the outer peripheral surface of the heat transfer member 2021 formed of a metal cylindrical member, and the heat transfer member 2021 having the light emitting unit 2011 disposed therein is a cylindrical cover 2031. It is the composition stored inside. Here, the heat transfer member 2021 is a flat portion 2022 having a flat surface 2022 a on which the light emitting portion 2011 is placed, and a flat portion 2022 at both ends (both ends in the horizontal direction in FIG. 17) of the flat portion 2022. And a curved plate-like portion 2023 of arc-shaped cross section which is bent along the inner peripheral surface of the cover 2031.

Then, as shown by the arrows in FIG. 17, the heat generated in the light emitting unit 2011 is transmitted along the flat portion 2022 to both end portions (both end portions in the left and right direction in FIG. 17) of the flat portion 2022. After being transmitted to the curved plate portion 2023, the light is discharged to the outside through the cover 2031.

JP, 2009-266432, A

However, in the lamp 2001 having the configuration shown in FIG. 17, the heat generated by the light emitting unit 2011 is not sufficiently dissipated, and the temperature of the light emitting unit 2011 rises to lower the light emission efficiency of the LED mounted on the light emitting unit 2011 May lead to

The present invention has been made in view of the above, and it is an object of the present invention to provide a lamp capable of improving heat dissipation.

In order to achieve the above object, the lamp according to one aspect of the present invention is generated by the light emitting unit, the long envelope enclosing the light emitting unit, the light emitting unit, and the light emitting unit. A flat plate-like portion having a long flat heat transfer member for transferring heat to the envelope, the heat transfer member being formed in a long flat plate shape, and having a light emitting portion disposed on one side thereof; A curved plate-like portion which is bridged between the widthwise end portions of the flat plate portion on the other surface and is bent along the inner circumferential surface of the envelope so as to contact the envelope, the flat plate portion and the curved plate The thermal coupling part is located in a space surrounded by the part and which thermally couples the flat part and the curved part.

According to this configuration, in the heat transfer member, the thermal coupling portion thermally couples the flat plate-like portion in which the light emitting portion is disposed and the curved plate-like portion in contact with the inner peripheral surface of the envelope. There is. Thus, the heat coupling portion is secured by securing a path from the flat portion to the curved plate portion through the thermal coupling portion as a heat radiation path by heat conduction of heat generated in the light emitting portion and transmitted to the flat portion. The heat radiation of heat generated in the light emitting portion can be improved as compared to a lamp provided with a heat transfer member having a configuration without the light.

1 is an exploded perspective view of a lamp according to Embodiment 1. FIG. The lamp | ramp which concerns on Embodiment 1 is shown, (a) is sectional drawing which fractured | ruptured partially, (b) shows the sectional view seen from the direction orthogonal to the direction which looks at (a). 5 is a circuit diagram showing a circuit including a rectifying unit in the lamp according to Embodiment 1. FIG. The lamp which concerns on Embodiment 1 is shown, (a) is the sectional view fractured along the AA line in FIG.2 (b), (b) is the fragmentary sectional view fractured along the BB line in FIG.2 (b) It is. FIG. 5 is a perspective view of the main part (heat transfer member) of the lamp according to the first embodiment. FIG. 10 is a perspective view after the main manufacturing steps of the heat transfer member according to the first embodiment. FIG. 7 is a cross-sectional view of a lamp in accordance with a second embodiment. FIG. 8 is a cross-sectional view showing a lamp according to a second embodiment and broken along a line CC in FIG. 7; It is a perspective view of the principal part (heat-transfer member) of the lamp | ramp which concerns on Embodiment 2. FIG. It is a fragmentary sectional view of the lamp concerning a modification. It is a perspective view after the main manufacturing processes of the heat transfer member concerning a modification. It is a fragmentary sectional view of the lamp concerning a modification. About the lamp | ramp which concerns on a modification, (a) is sectional drawing of a lamp | ramp, (b) is a disassembled perspective view of a heat-transfer member. About the lamp | ramp which concerns on a modification, (a) is sectional drawing of a lamp | ramp, (b) is a disassembled perspective view of a heat-transfer member. It is sectional drawing of the lamp | ramp which concerns on a modification. It is a perspective view of the heat-transfer member to which the light emission part which concerns on a modification was attached. It is sectional drawing of the lamp | ramp which concerns on a prior art example.

Embodiment 1
<1> Configuration FIG. 1 shows an exploded perspective view of a lamp 1 according to the present embodiment, and FIG. 2 (a) is a partially broken sectional view of the lamp 1 according to the present embodiment, FIG. 2 shows a cross-sectional view as seen from a direction orthogonal to the direction in which FIG. 2 (a) is viewed. In FIG. 1, a part of the heat transfer member 21 is a cross-sectional view showing an internal structure.

As shown in FIG. 1, the lamp 1 includes 20 light emitting units 11, a heat transfer member 21 for transferring heat generated by the light emitting units 11, and a long cover for containing the light emitting units 11 and the heat transfer member 21. 31, a pair of

bases

41 and 42 attached to both ends of the cover 31 in the longitudinal direction, and a rectifying unit 51 disposed inside the base 41 and rectifying alternating current received by the

bases

41 and 42 to direct current. And The cover 31 and the

caps

41 and 42 constitute a long envelope that accommodates the light emitting unit 11 and the heat transfer member 21. Here, the reason why the lamp 1 is provided with the rectifying unit 51 is to be attached and used as it is to a luminaire corresponding to a conventional straight tube fluorescent lamp.

<1-1> Light Emitting Unit The light emitting unit 11 has an LED chip (not shown) and a conductor pattern (not shown) for supplying power to the LED chip on one surface side, and the LED chip on the one surface side And a rectangular plate-shaped mounting substrate 1120 mounted thereon. In addition, the light emitting unit 11 is provided with a dome-shaped color conversion member 1170 made of a phosphor and a translucent material that is excited by the light emitted from the LED chip and emits light of a color different from the light emission color of the LED chip. ing. Here, the color conversion member 1170 is disposed on the one surface side of the mounting substrate 1120 so as to surround the LED chip with the mounting substrate 1120. The LED chip is a GaN-based blue LED chip that emits blue light.

<1-2> Cover The cover 31 is formed in a cylindrical shape, and a pair of first ribs 32 and a pair of second ribs 33 are provided in a projecting manner on the peripheral wall thereof.

The first rib 32 and the second rib 33 are for fixing the heat transfer member 21 to the inner wall of the cover 31. In the present embodiment, the first rib 32 and the second rib 33 are both convex toward the radial center of the cover 31 and extend along the longitudinal direction of the cover 31 (FIG. 2 (a )reference). The cover 31 is formed of a resin material such as a light transmitting acrylic resin. The cover 31 is not limited to a resin material, and may be a translucent material, and may be made of, for example, glass, ceramics, or the like. When the cover 31 formed of a resin material is employed, it is preferable to use a material having a small thermal expansion coefficient. As in the case of the lamp 1, in the case of a lamp employing an LED chip as a light source, the light emitting portion 11 generates heat when lit. Therefore, if the cover 31 is formed of a material having a large thermal expansion coefficient, the size of the cover 31 may change and distortion may occur in the lamp 1 due to the temperature difference between the lighting time and the lighting time. In particular, when the length in the longitudinal direction of the lamp 1 expands and contracts, the alignment between the lamp 1 and the lighting fixture to which the lamp 1 is attached is reduced, and as a result, the lamp may be dropped. In the present embodiment, the heat transfer member 21 is fixed to the cover 31 by the

ribs

32 and 33 which are convex toward the center of the cover 31 in the radial direction. The means for fixing to the cover 31 is not limited to the one using the

ribs

32 and 33. For example, the heat transfer member 21 may be fixed to the cover 31 by providing a recess on the inner wall of the cover 31 and fitting the peripheral portion of the heat transfer member 21 to the recess.

<1-3> Bases The

base

41 and 42 are each composed of a

cylindrical base body

41a and 42a with a bottom and a pair of

base pins

41b and 42b. As shown in FIG. 2B, in the

base body

41a, 42a,

insertion holes

41c, 42c are formed for inserting fixing

screws

43, 44 for fixing the

base body

41a, 42a to the heat transfer member 21. It is set up. The

base body

41a, 42a is fixed to the heat transfer member 21 by screwing the tip of the fixing

screw

43, 44 inserted in each of the

insertion holes

41c, 42c to the heat transfer member 21. Further, in the bottom wall of the

base body

41a, 42a, a lower hole (not shown) for implanting the

base pin

41b, 42b is formed, and the

base pin

41b, 42b passes through the lower hole It is planted by being press-fitted in the Here, the die

main bodies

41a and 42a are formed of a highly heat-resistant resin material, and the die pins 41b and 42b are formed of a metal such as aluminum or copper. The

caps

41 and 42 conform to, for example, the G13 standard. The

caps

41 and 42 are attached to a pair of sockets disposed in the existing luminaire for straight tube fluorescent lamps. Then, power is supplied from an external power source to each light emitting unit 11 through the socket and the

caps

41 and 42.

In addition, the

caps

41 and 42 are not limited to the above-mentioned structure, and may use a cap of other structure used as a cap for a straight tube type LED lamp. For example, it may be a base of G13 type conventionally used for a straight tube fluorescent lamp, or alternatively, it is fed from only one of the straight tube LED lamps in the longitudinal direction as defined in the JEL 801 standard. It may be a possible type of cap.

<1-4> Rectifying Unit As shown in FIG. 1, the rectifying unit 51 is disposed inside the mouthpiece main body 41a. Further, as shown in FIG. 2, the rectifying unit 51 is composed of a circuit board 52 and circuit elements 53 mounted on the circuit board 52. Here, the circuit board 52 is fixed to the bottom wall of the mouthpiece main body 41 a by an adhesive. Then, the cap pins 41 b and 42 b and the conductive pattern (not shown) formed on the circuit board 52 are electrically connected via a covering wiring (not shown).

A circuit diagram of a circuit including the rectifying unit 51 in the lamp 1 according to the present embodiment is shown in FIG.

As shown in FIG. 3, the rectifying unit 51 corresponds to a diode bridge configured of four diodes 55. The rectifying unit 51 has the input end 57A and the base pin 41b electrically connected, and the input end 57B and the base pin 42b electrically connected.

Further, the output end 57C of the rectification unit 51 is electrically connected to the high potential side input end of the series circuit in which the plurality of light emitting units 11 are connected in series, and the output end 57D of the rectification unit 51 is the series It is electrically connected to the input terminal on the low potential side of the circuit.

<1-5> Heat Transfer Member FIG. 4 (a) is a cross-sectional view taken along line AA in FIG. 2 (b), and FIG. 4 (b) is a line BB in FIG. 2 (b). And FIG.

As shown to FIG. 1 and FIG. 4 (a), the heat-transfer member 21 is provided with the flat part 22, the curved plate part 23, and the two bridge | crosslinking parts 25. As shown in FIG. Also, the two bridge portions 25 are located in the space surrounded by the flat plate portion 22 and the curved plate portion 23, and are a thermal coupling portion that thermally couples the flat portion 22 and the curved plate portion 23. It corresponds to The flat portion 22 is formed in an elongated flat shape, and the light emitting portion 11 is disposed on the disposition surface 22 a side in the thickness direction. The curved plate-like portion 23 is bridged between both widthwise end portions of the flat plate-like portion 22 on the side opposite to the disposition surface 22 a side of the flat plate-like portion 22 and is curved to contact along the inner peripheral surface of the cover 31 doing. The heat transfer member 21 is formed of a metal such as an aluminum alloy. The heat transfer member 21 is not limited to a metal, and may be, for example, a material having a high thermal conductivity, such as a ceramic or a heat conductive resin. In the present invention, “thermally coupled” refers to a state in which thermally coupled members are in contact with each other, or another thermally coupled member. It also includes the case where the member is interposed.

Further, as shown in FIG. 4A, the disposition surface 22 a of the flat plate portion 22 is located closer to the curved plate portion 23 than the central axis of the cover 31.

At both end portions in the vicinity of the flat plate-like portion 22 in the curved plate-like portion 23, groove portions 24 extended in the entire longitudinal direction of the heat transfer member 21 are formed. The groove portion 24 is formed in a substantially rectangular shape in cross section, and the depth direction thereof is the short direction of the flat portion 22 and coincides with the direction along the disposition surface 22 a of the flat portion 22. . That is, the bottom surface of the groove portion 24 is orthogonal to the disposition surface 22 a of the flat portion 22, and the inner circumferential side surface is parallel to the disposition surface 22 a. Further, the distance between the disposition surface 22 a of the light emitting portion 11 in the flat plate portion 22 of the heat transfer member 21 and the inner peripheral side surface on the light emitting portion 11 side in the groove portion 24 is the first rib 32 and the second rib of the cover 31. It is substantially the same as the distance between the two. Here, the heat transfer member 21 is fixed to the cover 31 in a state of being sandwiched between the inner peripheral surface of the cover 31 and the first rib 32.

Further, as shown in FIG. 4 (b), the two bridge portions 25 have an elongated shape substantially the same as the length of the flat portion 22, and extend across the entire heat transfer member 21 in the longitudinal direction. It has been extended. Thus, the rigidity of the heat transfer member 21 to the force applied in the direction of bending the heat transfer member 21 can be improved as compared with the lamp 2001 having the configuration shown in FIG. Further, by bringing the heat transfer member 21 provided with the bridging portion 25 extending in the longitudinal direction of the heat transfer member 21 into contact with the inner wall surface of the cover 31, the rigidity of the cover 31 itself is also improved. Nevertheless, the deflection of the lamp 1 due to its own weight is reduced.

Further, a length L2 between two portions in which each of the two bridge portions 25 is continuous to the flat plate portion 22 is shorter than a length L1 in the short direction of the heat transfer member 21 of the light emitting portion 11. That is, when viewed in the thickness direction of the flat plate portion 22, the two bridge portions 25 are continuously formed on the flat portion 22 in a region overlapping the light emitting portion 11. Thereby, the transfer efficiency of the heat generated by the light emitting unit 11 to the bridge portion 25 is increased. In addition, the said structure comprised continuously says the state which the member has joined so that heat transfer may be performed continuously. Therefore, the flat plate portion 22 and the bridge portion 25 may be integrally formed of the same material, or members in which the flat portion 22 and the bridge portion 25 are separately connected and integrated May be.

Here, the perspective view of the heat-transfer member 21 which is the principal part of the lamp | ramp 1 is shown in FIG.

As shown in FIG. 5, the flat plate-like portion 22 is formed in an elongated rectangular plate shape, and twenty light emitting portions 11 are disposed on the disposition surface 22 a. Further, at both end portions in the longitudinal direction of the heat transfer member 21, a mouthpiece fixing portion 26 in which screw holes 27 for fixing the

mouthpieces

41 and 42 to the heat conduction member 21 are provided is provided.

The width of the base fixing portion 26 in the short direction of the heat transfer member 21 is substantially the same as the distance between the end portions of the pair of first ribs 32 of the cover 31, and the pair of second ribs of the cover 31 The same applies to the distance between the end portions of 33. And the nozzle | cap | die fixing | fixed part 26 is arrange | positioned in the area | region between the front-end | tip parts of a pair of 2nd ribs 33 of the cover 31 in the state fixed to the inside of the cover 31. FIG. Then, the tip end portions of fixing

screws

43 and 44 inserted into the insertion holes 41c and 42c of the mouthpiece

main bodies

41a and 42a are screwed into the screw holes 27, respectively.

One end of the heat transfer member 21 is electrically connected to the cap pin 42 b of the cap 42 in the space surrounded by the flat portion 22, the curved plate portion 23 and the two bridge portions 25. A feeder line (not shown) is wired, the other end of which is electrically connected to the rectifying unit 51 disposed inside the mouthpiece main body 41a. As described above, when the feed line is wired in the air gap formed in the heat transfer member 21, the eddy current generated around the feed line is caused as compared with the configuration in which the feed line is embedded in the heat transfer member. Since the impedance can be reduced, the power efficiency can be improved.

Next, a method of fixing the heat transfer member 21 to the cover 31 will be described.

First, the heat transfer member 21 is inserted from one end side of the cover 31 in a state where the mouthpiece fixing portion 26 is positioned between the pair of first ribs 32 and the pair of second ribs 33 of the cover 31 (see FIG. 1). Then, the second rib 33 is inserted into the groove 24 of the heat transfer member 21, and the heat transfer member 21 is the first rib of the cover 31 in a state where the first rib 32 abuts on the disposition surface 22 a of the heat transfer member 21. The heat transfer member 21 is fixed to the cover 31 by sliding the cover 31 along the longitudinal direction 32 and the second rib 33 in the longitudinal direction.

As described above, when the heat transfer member 21 is fixed to the cover 31, a fixing material such as an adhesive is not necessary, so that the member cost can be reduced. Further, since the first rib 32 and the second rib 33 are extended over the entire longitudinal direction of the cover 31, the fixing strength of the heat transfer member 21 to the cover 31 is increased accordingly. Furthermore, as described above, the heat transfer member 21 is fixed to the cover 31 in a state in which the pair of second ribs 33 provided on the cover 31 is fitted in the groove 24. Thus, the contact area between the curved plate-like portion 23 and the cover 31 can be enlarged, so that the heat transfer efficiency from the curved plate-like portion 23 to the cover 31 can be improved. Further, the heat transfer member 21 is fixed to the inside of the cover 31 with the second rib 33 of the cover 31 fitted in the groove 24 of the heat transfer member 21, so that the heat transfer member 21 has a central axis of the cover 31. Movement in the direction of rotation around is restricted.

Next, the heat radiation route of the lamp 1 according to the present embodiment will be described with reference to FIG. 4 (a).

The heat radiation path of the heat generated in the light emitting portion 11 is transmitted along the flat plate portion 22 to both ends in the short side direction of the flat plate portion 22 (see arrow AR11 in FIG. 4A). It transmits to the part 23 (see arrow AR12 in FIG. 4 (a)) and then reaches the cover 31 via the contact portion between the curved plate-like part 23 and the cover 31 (arrow AR3 in FIG. 4 (a)). In addition to the above, there is a path (see an arrow AR2 in FIG. 4A) for transmitting from the bridge portion 25 to the curved plate portion 23 after being transmitted from the flat plate portion 22 to the bridge portion 25. That is, since the number of heat radiation paths is increased as compared with the lamp 2001 having the configuration described with reference to FIG. 17, the heat radiation performance can be improved accordingly.

<3> Manufacturing Method of Heat Transfer Member FIG. 6 is a perspective view after the main manufacturing steps of the heat transfer member 21 according to the present embodiment. Here, the case where the heat transfer member 21 is formed of an aluminum alloy will be described as an example.

The heat transfer member 21 according to the present embodiment is manufactured by a so-called die casting method.

First, an elongated portion (hereinafter referred to as “rod-shaped portion”) which is equal to the outer shape of each region formed by dividing the region surrounded by the flat plate portion 22 and the curved plate portion 23 in the heat transfer member 21 by two bridge portions 25 And the hollow 71a having a shape along the outer shape of the flat plate-like portion 22 and the curved plate-like portion 23, and the longitudinal direction of the rod-like portion 72a with respect to the fixed die 72. A movable mold 71 movable in the direction is prepared (see FIG. 6A). Here, the movable mold 71 and the fixed mold 72 seal the cavity 71 a of the movable mold 71 while the rod-like portion 72 a of the fixed mold 72 is disposed in the cavity 71 a of the movable mold 71. It has a shape that can be done. Here, the movable mold 71 and the fixed mold 72 are formed of, for example, a heat-resistant steel such as carbon steel. Also. In a part of the movable mold 71, an injection hole (shown in the drawing) for injecting the molten aluminum alloy into a space formed by the cavity 71a of the movable mold 71 and the rod-like portion 72a of the fixed mold 72 by a die casting machine. Is formed.

Next, in a state where the rod-like portion 72a of the fixed mold 72 is disposed in the cavity 71a of the movable mold 71 and the cavity 71a is sealed, the die casting machine injects the molten aluminum alloy from the injection hole by the die casting machine The space formed by the cavity 71 a of the mold 71 and the rod-like portion 72 a of the fixed mold 72 is filled with an aluminum alloy.

Thereafter, when the aluminum alloy solidifies, as shown by the arrows in FIG. 6A, the movable mold 71 is pulled out from the fixed mold 72 along the longitudinal direction of the rod-like portion 72a, as shown in FIG. A first member 61 as shown in FIG. Here, the first member 61 is fixed to the movable mold 71 side. Then, after the movable mold 71 is pulled out of the fixed mold 72, the first member 61 is pushed out of the movable mold 71 by a pushing mechanism (not shown) provided in the movable mold 71.

Next, as shown in FIG. 6 (c), a second member 62 serving as a base of the mouthpiece fixing portion 26 is welded to both ends in the longitudinal direction of the first member, and screw holes 27 are formed in each of the second members 62. By setting, the heat transfer member 21 is formed.

The present manufacturing method is not limited to the case where the heat transfer member 21 is formed of an aluminum alloy. For example, even when the heat transfer member 21 is formed of a magnesium alloy, a zinc alloy or a copper alloy, the same method is used. can do.

Second Embodiment
FIG. 7 shows a cross-sectional view of the lamp 2 according to the present embodiment. FIG. 8 is a cross-sectional view taken along line CC in FIG.

The lamp 2 according to the present embodiment has substantially the same configuration as the lamp 1 according to the first embodiment, and the shapes of the cover 231 and the heat transfer member 221 are different from the lamp 1 according to the first embodiment. The same components as those of the first embodiment are denoted by the same reference numerals, and the description will not be repeated.

As shown in FIG. 8, the cover 231 includes a curved plate-like portion 231 a formed in a curved plate shape having an arc-shaped cross section, and a flat plate-shaped portion 231 b formed in a flat plate shape. Here, a pair of ribs 232 extended along the longitudinal direction of the cover 231 is provided on the curved plate-like portion 231a, that is, on the inner peripheral surface of the cover 231 other than the flat plate-like portion 231b. The ribs 232 are parallel to one surface of the flat portion 231b on which the light emitting portion 11 is disposed, and protrude in a direction approaching each other. Further, the rib 232 is extended over the entire longitudinal direction of the cover 231.

The heat transfer member 221 includes a main piece 221a and a side piece 221b. The thickness of the main piece 221 a is substantially equal to the distance between the flat portion 231 b of the cover 231 and the rib 232. Further, the main piece 221 a is disposed in surface contact with the flat portion 231 b of the cover 231. Thereby, the heat transmitted to the main piece 221 a is transmitted to the cover 231 through the portion in surface contact, and is released from the outer surface of the cover 231 to the outside air. Further, both end portions in the short side direction on the surface side on which the light emitting portion 11 of the main piece 221 a is disposed are in contact with the rib 232 of the cover 231. As a result, the contact area between the main piece 221a and the cover 231 can be expanded, so the heat transfer efficiency from the main piece 221a to the cover 231 can be improved. The heat transfer member 221 is formed of a metal such as aluminum. The heat transfer member 221 is not limited to a metal, and may be, for example, a material having high thermal conductivity, such as a ceramic or a heat conductive resin. Further, a convex portion (not shown) is formed on one of a portion of the heat transfer member 221 in contact with the flat portion 231 b and a portion of the flat portion 231 b in contact with the heat transfer member 221. The other may have a fitting portion (not shown) fitted to the convex portion.

Here, a perspective view of the heat transfer member 221 which is a main part of the lamp 2 is shown in FIG.

As shown in FIG. 9, the main piece 221a is formed in an elongated rectangular plate shape, and the side pieces 221b are extended in the thickness direction of the main piece 221a from both ends in the longitudinal direction of the main piece 221a. Further, screw holes 221c for fixing the

caps

41, 42 to the heat transfer member 221 are bored in each side piece 221b. The length of the side piece 221 b in the lateral direction of the heat transfer member 221 is smaller than the distance between the tip end portions of the pair of ribs 232 of the cover 231.

In the lamp 2 according to the present embodiment, the entire other surface of the main piece 221 a opposite to the surface on which the light emitting portion 11 is disposed is in surface contact with the flat portion 231 b of the cover 231. As a result, the heat radiation path until the heat generated by the light emitting unit 11 reaches the cover 231 can be shortened to the thickness of the main piece 221a. Therefore, by designing the main piece 221a to be thinner, the heat dissipation can be further improved.

Next, a method of fixing the heat transfer member 221 to the cover 231 will be described.

First, the heat transfer member 221 is inserted from one end side of the cover 231 with the side piece 221 b positioned between the pair of ribs 232 of the cover 231. The surface of the main piece 221a opposite to the surface on which the light emitting portion 11 is disposed is in contact with the flat portion 231b of the cover 231, and both ends in the lateral direction of the main piece 221a are rib 232 and flat portion The heat transfer member 221 is fixed to the cover 231 by being slid in the longitudinal direction of the cover 231 in a state of being inserted between the heat transfer member 231 and the heat transfer member 231 b. As a result, the work of fixing the heat transfer member 221 to the cover 231 becomes easy, and a fixing material such as an adhesive becomes unnecessary, so that the member cost can be reduced. Further, the rib 232 is extended over the entire longitudinal direction of the cover 231, and both ends in the end hand direction are held between the rib 232 and the flat portion 231b over the entire longitudinal direction of the main piece 221a. Because the heat transfer member 221 is fixed in the state, the fixing strength of the heat transfer member 221 to the cover 231 can be increased.

<Modification>
(1) In the first embodiment, the two bridge portions 25 have an elongated shape substantially the same as the length of the flat plate portion 22 and are extended over the whole of the heat transfer member 21 in the longitudinal direction. However, the present invention is not limited to this.

FIG. 10A shows a partial cross-sectional view of the lamp 3 according to the present modification.

As shown to Fig.10 (a), the lamp | ramp 3 by which the some bridge | crosslinking part 325 is provided in 2 rows along the longitudinal direction of the heat-transfer member 321 may be used. According to the present modification, the total weight of the bridge portion 325 can be reduced as compared to the heat transfer member 21 according to the first embodiment, so that the weight of the lamp 3 can be reduced. Further, parts of two bridge portions 325 adjacent to each other in the longitudinal direction of the heat transfer member 321 are arranged to overlap with each other in the lateral direction of the heat transfer member 321. Thus, compared to the configuration in which a part of the two bridge portions 325 adjacent in the longitudinal direction of the heat transfer member 321 do not overlap in the lateral direction of the heat transfer member 321, a force applied in the direction to bend the heat transfer member 321. The rigidity against can be improved.

Here, a method of manufacturing the heat transfer member 321 will be described.

FIG. 11 shows a perspective view after the main manufacturing steps of the heat transfer member 321 according to the present embodiment. Here, the case where the heat transfer member 321 is formed of an aluminum alloy will be described as an example.

First, an elongated protrusion having the same shape as the shape of a portion excluding a plurality of (14 in FIG. 11A) bridge portions 325 from the region surrounded by the flat plate portion 322 and the curved plate portion 323 of the heat transfer member 321 Fixed mold (hereinafter referred to as "fixed mold") 272 having a strip (hereinafter referred to as "projected part") 272a, flat plate part 322 of heat transfer member 321, curved plate part 323, and It has a cavity 271a equal to the outer shape of the third member 361 composed of 14 bridge portions 325, and can be moved in the projecting direction of the ridge portion 272a (see the arrow in FIG. 11A) with respect to the fixed mold 272 A movable mold (hereinafter referred to as "movable mold") 271 is prepared (see FIG. 11A). Here, the cavity 271a of the movable mold 271 can be in a sealed state in a state in which the ridge portion 272a of the fixed mold 272 is disposed in the cavity 271a of the movable mold 271. Here, the movable mold 271 and the fixed mold 272 are formed of, for example, carbon steel or the like. Also. A part of the movable mold 271 is an injection hole for injecting the molten aluminum alloy into a space formed by the cavity 271a of the movable mold 271 and the projected streak portion 272a of the fixed mold 272 by a die casting machine (see FIG. Not shown) is formed.

Next, with the ridge portion 272a of the fixed mold 272 disposed in the cavity 271a of the movable mold 271 and the cavity 271a sealed, the aluminum alloy is injected from the injection hole by the die casting machine to move the movable The space formed by the cavity 271 a of the mold 271 and the protruding portion 272 a of the fixed mold 272 is filled with an aluminum alloy.

After that, when the aluminum alloy solidifies, as shown by the arrow in FIG. 11A, the movable mold 271 is pulled out with respect to the fixed mold 272 along the projecting direction of the protruding portion 272a, as shown in FIG. The third member 361 is formed as shown in FIG. Here, the third member 361 is fixed to the movable mold 271 side. Then, after the movable mold 271 is pulled out of the fixed mold 272, the third member 361 is pushed out of the movable mold 271 by a pushing mechanism (not shown) provided in the movable mold 271.

Thereafter, after an elongated rectangular plate-like fourth member 363 to be a base of the flat plate portion 322 is covered on the opening 361 a of the third member 361 (see the arrow in FIG. 11B), the fourth member 363 is resistance welded. Is joined to the third member 361.

Thereafter, similar to the example described with reference to FIG. 6 in the first embodiment, the second member 62 is joined by resistance welding to both end sides in the longitudinal direction of the structure including the third member 361 and the fourth member 363. Thus, the heat transfer member 321 can be formed.

(2) In the first embodiment, an example in which the two heat transfer members 21 are provided with the two bridge portions 25 has been described, but the present invention is not limited to this.

10 (b) and 12 show partial cross-sectional views of the

lamps

4 and 5 according to the present modification.

As shown in FIG. 10B, the lamp 4 may be formed by providing three bridge portions 425 extended in the entire longitudinal direction of the heat transfer member 421. According to the present modification, the flat plate-like portion 422 in which the light emitting portion 11 is disposed and the curved plate-like portion 423 in surface contact with the cover 31 are thermally coupled by the three bridging portions 425. Since the number of heat radiation paths can be further increased as compared with the lamp 1 according to mode 1, the heat radiation performance can be further improved. The heat transfer member 421 can be manufactured by the same manufacturing method as the manufacturing method described in the first embodiment.

Alternatively, as shown in FIG. 12, the lamp 5 is provided with a heat transfer member 521 in which two bridge portions 525 are provided in each of the portions of the flat plate portion 522 corresponding to the portions where the light emitting portions 11 are disposed. It may be. According to this modification, the flat plate-like portion 522 in which the light emitting portion 11 is disposed and the curved plate-like portion 523 in surface contact with the cover 31 are provided via the bridging portion 525 provided in the portion corresponding to each light emitting portion 11. And thermally coupled. Therefore, the heat generated at each light emitting portion 11 and transferred to the flat plate portion 522 can be efficiently transferred to the curved plate portion 523 and, compared with the heat transfer member 21 according to the first embodiment, the bridge portion Since the total weight of 525 can be reduced, the weight of the lamp 5 can be reduced. In addition, the heat transfer member 521 which concerns on this modification can be manufactured by the manufacturing method similar to the heat transfer member 321 of the structure shown to Fig.10 (a).

(3) In the first embodiment, the example of the lamp 1 including the heat transfer member 21 in which the flat plate portion 22, the curved plate portion 23, and the bridge portion 25 are integrally formed has been described, but the present invention is limited thereto. It is not a thing.

A cross-sectional view of the lamp 6 according to the present modification is shown in FIG. 13 (a), and an exploded perspective view of the heat transfer member 621 is shown in FIG. 13 (b).

As shown to Fig.13 (a), the heat-transfer member 621 consists of the flat member 621a, and the half-cylindrical member 621b which comprises the curved plate-like part 623 and the bridge | crosslinking part 625, ie, it consists of two members. It may be a lamp 6. Here, as shown in FIG. 13B, the heat transfer member 621 of the lamp 6 is configured of a rectangular plate-shaped flat member 621a and a semi-cylindrical member 621b. Here, in the semi-cylindrical member 621b, the length in the longitudinal direction is substantially the same as the length in the longitudinal direction of the flat member 621a between the two cap fixing parts 26 on the side to which the flat member 621a is attached. An equal elongated recess 623a is formed. Then, when the flat member 621a is fitted in the recess 623a, the tip end surface of the bridge portion 625 of the semicylindrical member 621b and the tip end surface of the curved plate portion 623 are arranged with the light emitting portion 11 in the flat member 621a. It abuts on the other side opposite to the one side provided. Thus, in the heat transfer member 621 formed by combining the flat member 621a and the semicylindrical member 621b, a heat transfer path from the flat member 621a to the bridge portion 625 and the curved plate portion 623 is secured. Further, a stepped portion 624 is formed in the vicinity of the tip end portion of the curved plate-like portion 623 in the semi-cylindrical member 621 b, and the second rib 33 of the cover 31 abuts on the stepped portion 624 of the semi-cylindrical member 621 b. It is fixed to the inside of the cover 31 in the state. Thus, the movement of the semicylindrical member 621 b in the direction of rotation around the central axis of the cover 31 is restricted.

Moreover, sectional drawing of the lamp | ramp 7 which concerns on another modification is shown to Fig.14 (a), and the disassembled perspective view of the heat-transfer member 721 is shown in FIG.14 (b).

As shown to Fig.14 (a), the heat-transfer member 721 may be comprised from the flat member 722 and the cylindrical member 723. As shown in FIG. Here, the cylindrical member 723 is curved along the width direction of the flat plate-like portion 723b so as to be continuous with both ends of the elongated rectangular plate-like flat plate-like portion 723b and the widthwise direction of the flat plate-like portion 723b. A lamp 7 comprising a curved plate-like portion 723a and two bridge portions 725 extending in the direction perpendicular to the flat portion 723b from the vicinity of the center of the flat portion 723b in the lateral direction. May be

Further, as shown in FIG. 14 (b), the heat transfer member 721 of the lamp 7 is long in the cylindrical member 723 between the two cap fixing parts 26 on the side to which the flat member 722 is attached. An elongated recess 723c is formed, the length of which is substantially equal to the length of the flat member 722 in the longitudinal direction. When the flat member 722 is fitted in the recess 723 c, the other surface opposite to the one surface on which the light emitting portion 11 is disposed in the flat member 722 is in surface contact with the flat portion 723 b of the cylindrical member 723. Do. Thus, in the heat transfer member 721 formed by combining the flat member 722 and the cylindrical member 723, the heat transfer efficiency from the flat member 722 to the cylindrical member 723 can be improved.

(4) In the second embodiment, the heat transfer member 221 is in a state in which both ends in the short direction of the main piece 221 a of the heat transfer member 221 are sandwiched by the flat portion 231 b of the cover 231 and the pair of ribs 232. Although the example of the lamp 2 fixed to the cover 231 has been described, the present invention is not limited to this.

A cross-sectional view of the lamp 8 according to the present modification is shown in FIG.

As shown to Fig.15 (a), the lamp | ramp 8 with which the main piece 221a of the heat-transfer member 221 adhered to the flat part 231b of the cover 831 with the adhesive agent 231c which consists of heat conductive resin may be sufficient.

(5) In the second embodiment, the example of the lamp 2 in which the surface of the main piece 221 a of the heat transfer member 221 opposite to the light emitting unit 11 is covered with the flat portion 231 b of the cover 231 has been described. It is not limited to this.

Cross-sectional views of the

lamps

9 and 10 according to this modification are shown in FIGS. 15 (b) and (c).

As shown in FIG. 15B, in a state in which both end portions in the short side direction of the main piece 221a of the heat transfer member 221 are held between the outer peripheral portion of the slit 934 in the flat portion 931b and the pair of ribs 232. The heat member 221 may be a lamp 9 fixed to the cover 931. Here, the cover 931 is provided with a cover 931 in which a pair of ribs 932 is provided on the curved plate-like portion 931 a and a slit 934 is formed on the flat portion 931 b along the longitudinal direction of the cover 931. Further, an adhesive (not shown) made of a heat conductive resin such as a silicone resin is applied between the heat transfer member 221 and the peripheral portion of the slit 934 formed in the flat portion 931b, to thereby cover the cover 931. The foreign substance can be prevented from entering the inside of the cover 931 from the outside through the slit 934. In the lamp 9, the other surface of the main piece 221 a of the heat transfer member 221 opposite to the one surface where the light emitting portion 11 is disposed is exposed to the outside of the cover 931. Therefore, the heat generated in the light emitting unit 11 and transmitted to the heat transfer member 221 is released from the other surface side of the main piece 221 a of the heat transfer member 221. Therefore, heat transfer is performed compared to the lamp 2 according to the second embodiment. Since the cover 231 does not intervene between the member 221 and the outside air, the heat dissipation can be improved.

Alternatively, as shown in FIG. 15C, both end portions of the main piece 221a of the heat transfer member 221 in the short direction are made of a heat conductive resin such as silicone resin in the outer peripheral portion of the slit 1034 in the flat portion 1031b. The lamp 10 may be fixed by an adhesive 1031 c. Here, the cover 1031 is composed of a curved plate-like portion 1031 a and a flat plate-like portion 1031 b, and includes a cover 1031 in which a slit 1034 is formed on the flat plate-like portion 1031 b along the longitudinal direction of the cover 1031.

(6) In the first and second embodiments, an example in which the plurality of light emitting units 11 are disposed in the

heat transfer members

21 and 221 has been described, but the present invention is not limited to this.

The perspective view of the heat-

transfer members

21 and 221 to which the light emission part 210 which concerns on this modification was attached is shown to Fig.16 (a) and (b).

As shown in FIGS. 16A and 16B, one light emitting unit 210 having a plurality of LED chips (light emitting elements) 211 may be fixed to the heat transfer member 21. Here, the light emitting unit 210 is made of an insulating material such as polyimide, and has an elongated rectangular plate-like wiring substrate 213 patterned with a wiring pattern (not shown) on the surface on which the LED chip 211 is mounted; A plurality of LED chips 211 mounted in a row on the substrate 213 and a sealing member 212 for collectively sealing the plurality of LED chips 211 are provided.

In this modification, the LED chip 211 is directly mounted on the wiring board 213 in which the area of the mounting surface of the LED chip 211 is larger than that of the heat sink member described in the first embodiment. Thereby, the heat generated in the LED chip 211 is efficiently transmitted to the heat transfer member 21 through the wiring board 213 as compared to the

lamps

1 and 2 according to the first and second embodiments, so that the heat dissipation is improved Can be In addition, if the wiring board 213 is formed of a resin material with high thermal conductivity such as silicone resin, the heat transfer efficiency from the LED chip 211 to the heat transfer member 21 can be further improved, and the heat dissipation of the lamp is further improved. Can be

1,2,3,4,5,6,7,8,9,10

lamp

11, 210

light emitting unit

21, 221, 321, 421, 521, 621, 721

heat transfer member

22, 231 b, 322, 422, 522 , 622, 723b, 931b, 1031b

flat portions

23, 231 a, 323, 423, 523, 623, 723a, 931a, 1031a curved plate portions 24

groove portions

25, 232, 325, 425, 525, 625, 725 bridge portions ( Thermal connection part)
26

cap fixing portion

27, 221c

screw hole

31, 231 cover 32 first rib 33

second rib

41, 42

cap

41a,

42a cap body

41b, 42b cap pin 51 rectifying unit 52 circuit board 53 circuit element 61 first member 62 Two member 361 Third member 363

Fourth member

71, 271

Movable mold

72, 272 Fixed mold 211, 1110 LED chip (light emitting element)
212 sealing member 213 wiring board 221a main piece 221b

side piece

231c, 1031c adhesive 621a, 722 flat member 621b half

cylindrical member

624, 724 stepped portion 723

cylindrical member

934, 1034 slit 1120 mounting substrate 1160 optical member 1170 color Conversion member

Claims

A light emitting unit,
A long envelope for housing the light emitting unit;
And an elongated heat transfer member which is accommodated in the envelope together with the light emitting portion and which transfers the heat generated in the light emitting portion to the envelope.
The heat transfer member is
A flat portion which is formed in a long flat plate shape and on which the light emitting portion is disposed on one side;
A curved plate-like portion which is bridged between both widthwise end portions of the flat plate-like portion on the other surface of the flat plate-like portion, and which is bent along the inner circumferential surface of the envelope to come into contact with the envelope. ,
A lamp which is located in a space surrounded by the flat plate-like portion and the curved plate-like portion and which thermally couples the flat plate-like portion and the curved plate-like portion.
The thermal coupling portion is formed over the entire longitudinal direction of the heat transfer member, and thermally couples the flat plate portion and the curved plate portion over the entire longitudinal direction of the heat transfer member. The lamp according to claim 1, characterized in that:
At least a part of the thermal coupling portion is thermally coupled to a region corresponding to a region in which the light emitting portion is disposed on the one surface in the other surface of the flat plate portion. The lamp | ramp of Claim 1 or Claim 2.
The light emitting unit includes a plurality of light emitting elements and a mounting substrate on which the plurality of light emitting elements are mounted.
The lamp according to any one of claims 1 to 3, wherein the mounting substrate is fixed to the heat transfer member.
The envelope has a cover formed in a long cylindrical shape, and a lid covering each end of the cover in the longitudinal direction,
The heat transfer member is located at one side of an imaginary plane including the central axis of the cover in an area inside the cover,
The lamp according to any one of claims 1 to 4, wherein the one surface of the flat portion and the virtual plane are separated in a direction orthogonal to the virtual plane.
The envelope has a cover formed in a long cylindrical shape, and a lid covering each end of the cover in the longitudinal direction,
The inner circumferential surface of the cover is provided with a pair of ribs extending along the longitudinal direction of the cover,
The lamp according to any one of claims 1 to 4, wherein movement of the heat transfer member in the cover is restricted by being locked by the pair of ribs.
A light emitting unit,
A long envelope for housing the light emitting unit;
And a long heat transfer member housed in the envelope together with the light emitting portion and transferring heat generated in the light emitting portion to the envelope.
The heat transfer member is formed in a plate shape, and the light emitting unit is disposed on one side,
A part of the peripheral wall of the envelope is a flat plate-like portion formed in a flat plate shape, and the other surface of the heat transfer member is in surface contact with the flat plate portion.
The lamp according to claim 7, wherein a slit is formed along the longitudinal direction of the envelope in the flat portion.
The inner circumferential surface of the envelope is provided with a pair of ribs extending along the longitudinal direction of the envelope at a portion other than the flat plate portion,
The lamp according to claim 7 or 8, wherein movement of the heat transfer member in the envelope is restricted by being locked by the pair of ribs.
A protrusion is formed on one of a part of the heat transfer member in contact with the flat plate and a part of the flat member in contact with the heat transfer member, and the other protrusion is formed on the other The lamp | ramp of any one of the Claims 7 thru | or 9 in which the fitting part which fits is formed.