JP2012221764A - Straight-tube type lamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a straight-tube type lamp capable of restraining deflection of a cylindrical case due to change of a total length by thermal expansion, and capable of reducing manufacturing cost with a simple structure.SOLUTION: The straight-tube type lamp is provided with a rod-like heat radiation member 20 for mounting an LED light source substrate 40, a cylindrical case 50 housing the heat radiation member 20 inside and equipped with a case end part 51 at either side in a length direction, a tea-caddy-lid-shaped cap part 60b on a ground side equipped with a disk part 63b and a side wall part 61b, fixed to the case end part 51b of the cylindrical case 50 so as to cover that 51b and with a surface of an inner side of the disk part 63b fixed to a member end surface 22b of the heat radiation member 20, and a tea-caddy-lid-shaped cap part 60a on a power-feeding side equipped with a disk part 63a and a side wall part 61a, with a surface of an inner side of the disk part 63a fixed to a member end surface 22a of the heat radiation member 20, and with a gap part 210 of a desired length formed between the case end part 51a and the surface of the inner side of the disk part 63a.

Description

  The present invention relates to a straight tube lamp using, for example, an LED as a light source.

  A straight tube lamp using an LED as a light source is composed of a rod-shaped heat radiating member to which a plurality of LEDs are attached, and a circular tube made of transparent resin or glass that houses the heat radiating member. Since the heat dissipating member and the circular tube are made of different materials, a difference occurs between the total length of the heat dissipating member and the total length of the circular tube due to the difference in the coefficient of thermal expansion that occurs when the LED generates heat. In particular, since the circular tube of the resin member greatly expands thermally, the entire length of the lamp becomes long, which may exceed the standard value. For example, there is a standard that the change in the total length of the lamp at an ambient temperature difference of 50 ° C. is 2 mm or less. Further, there is a risk that the straight tube lamp will bend due to heat shrinkage.

JP 2010-177441 A

  In the conventional straight tube LED lamp, there is a problem that the total length may exceed a standard value (change in the total length of the lamp at an ambient temperature difference of 50 ° C. is 2 mm or less) due to thermal expansion.

  Further, in the prior art, there is a technique such as slitting a circular tube in order to absorb the deflection of the straight tube type LED lamp due to the difference in coefficient of thermal expansion due to the difference in material (see Patent Document 1). Techniques such as making a slit in a circular pipe have a problem that dust and insects enter through the slit.

  The present invention has been made, for example, in order to solve the above-described problems, and it is possible to suppress a change in the total length due to thermal expansion within a standard value, and also to suppress deflection, and a structure is simple. It is possible to provide a straight tube LED lamp that is inexpensive to manufacture.

  A straight tube lamp according to the present invention is a rod-shaped heat radiating member to which a long LED substrate is attached, and a heat radiating member having end faces on both sides in the longitudinal direction, and a cylinder that houses at least a part of the heat radiating member therein. A tea tube comprising a cylindrical case having a cylindrical end provided with case end portions on both sides in the longitudinal direction, and a first disc portion and a first side wall portion provided on the periphery of the first disc portion. A lid-shaped first base part, which is fixed to the one case end so as to cover one case end of the cylindrical case, and an inner surface of the first disk part is A tea tube lid-shaped second comprising a first base portion fixed to one end surface of the heat radiating member, a second disc portion, and a second side wall portion provided at the periphery of the second disc portion. The inner surface of the second disk portion is fixed to the other end surface of the heat radiating member. And a second base part in which a gap of a predetermined length is formed between the other case end of the cylindrical case and the inner surface of the second disc part. And

  A straight tube lamp according to the present invention is a rod-shaped heat radiating member to which a long LED substrate is attached, and a heat radiating member having end faces on both sides in the longitudinal direction, and a cylinder that houses at least a part of the heat radiating member therein. A tea tube comprising a cylindrical case having a cylindrical end provided with case end portions on both sides in the longitudinal direction, and a first disc portion and a first side wall portion provided on the periphery of the first disc portion. A lid-shaped first base part, which is fixed to the one case end so as to cover one case end of the cylindrical case, and an inner surface of the first disk part is A tea tube lid-shaped second comprising a first base portion fixed to one end surface of the heat radiating member, a second disc portion, and a second side wall portion provided at the periphery of the second disc portion. The inner surface of the second disk portion is fixed to the other end surface of the heat radiating member. And a second base part in which a gap of a predetermined length is formed between the other case end of the cylindrical case and the inner surface of the second disc part. Deflection of the cylindrical case due to a change in the total length due to expansion can be suppressed, the structure is simple, and the manufacturing cost can be reduced.

1 is an overall perspective view of an LED lamp 200 showing Embodiment 1. FIG. 2 is a cross-sectional view of the LED lamp 200 taken along the line AA showing Embodiment 1. FIG. It is BB sectional drawing of the LED lamp 200 which concerns on Embodiment 1. FIG. 6 is a cross-sectional view of an LED lamp 201 according to Embodiment 2. FIG. 6 is an exploded perspective view of an LED lamp 201 according to Embodiment 2. FIG.

Embodiment 1 FIG.
FIG. 1 is an overall perspective view of an LED lamp 200 showing the present embodiment. FIG. 2 is a cross-sectional view of the LED lamp 200 taken along the line AA showing the present embodiment. FIG. 3 is a cross-sectional view of the LED lamp 200 according to the present embodiment taken along the line BB.

  As shown in FIG. 1, the LED lamp 200 includes a cylindrical case 50 (also referred to as a hollow circular tube), a power supply-side base portion 60a, and a ground-side base portion 60b. The base portion 60 a includes an L-shaped terminal 70 for supplying power to the LED module 100 inside the cylindrical case 50. The base portion 60b includes a T-shaped pin 80 that is a terminal for grounding.

  As shown in FIG. 2, the LED lamp 200 houses the heat radiating member 20 and the LED module 100 attached to the heat radiating member 20 in a cylindrical case 50. In addition, the LED lamp 200 is attached to the end of the heat dissipation member 20 and has a base part 60a and a base part 60b provided so as to close both ends of the cylindrical case 50, an L-shaped terminal 70 provided in the base part 60a, a base T-pins 80 provided on the portion 60b, and packings 90a and 90b that close the gap between the cap portions 60a and 60b and the cylindrical case 50 are provided.

  The LED lamp 200 is a rod-shaped heat radiating member 20 to which a long LED module 100 (LED substrate) is attached. The heat radiating member 20 includes member end faces 22 (22a, 22b) on both sides in the longitudinal direction. A cylindrical cylindrical case 50 that houses at least a part thereof, and includes a cylindrical case 50 having case end portions 51 (51a, 51b) on both sides in the longitudinal direction.

  The heat dissipating member 20 is formed of a material having high thermal conductivity such as aluminum in order to dissipate heat generated from the LED light source 30. As shown in FIG. 3, the heat radiating member 20 has a substantially semicircular bar shape in cross section, is provided with heat radiating fins 24 on the semicircular arc-shaped side, and the board mounting surface 23, which is a flat portion, has an LED module 100. Is attached.

  As shown in FIG. 2, the base portion 60 a is fixed to the member end surface 22 a of the heat radiating member 20 with screws or an adhesive. Further, the base portion 60b is fixed to the member end surface 22b of the heat radiating member 20 with screws or an adhesive.

  The LED module 100 includes an LED light source 30 and an LED light source substrate 40 on which the LED light source 30 is mounted.

  The LED light source 30 is a light emitting diode that emits white light (illumination light) such as daylight white, daylight color, and light bulb color. The LED light source substrate 40 has an elongated rectangular shape, and a plurality of LED light sources 30 are mounted in a straight line.

  The cylindrical case 50 is made of transparent or translucent resin or glass.

  The base part 60a has a tea tube lid shape including a disk part 63a and a side wall part 61a provided on the periphery of the disk part 63a. The base part 60b has a tea tube lid shape including a disk part 63b and a side wall part 61b provided on the periphery of the disk part 63b. The shapes of the base part 60a and the base part 60b are different in the shape of the terminals provided on the surfaces of the disk parts 63a and 63b, but the other parts are substantially the same shape. The cap portion 60a and the cap portion 60b have a cap shape with a “U” cross section and a circular disc portion 63 (bottom surface).

  In the description of the present embodiment, when the subscripts a and b are added to the disk portion 63, the side wall portion 61, the cylindrical case 50, the case end portion 51, and the like, the structure provided with a is the base portion 60a. It is assumed that it is a part on the side, and the configuration provided with b is a part on the base part 60b side.

  The base part 60b (first base part) is fixed to one case end part 51b so as to cover one case end part 51b of the cylindrical case 50, and a disk part 63b (first disk part). Is fixed to the member end surface 22 b of the heat dissipation member 20.

  The base part 60 a (second base part) is configured such that the inner surface of the disk part 63 a (second disk part) is fixed to the member end surface 22 a of the heat radiating member 20 and the other case end of the cylindrical case 50. A gap 210 having a predetermined length L1 is formed between the portion 51a and the inner surface of the disc portion 63a.

  As described above, the member end surface 22 of the heat radiating member 20 is fixed to the inner surface of the disc portion 63 with an adhesive or a screw. The LED lamp 200 includes a fixing portion 220 (220a, 220b) that fixes the inner surface of the disk portion 63 (63a, 63b) and the member end surface 22 (22a, 22b) of the heat dissipation member 20.

  As shown in FIG. 3, the heat radiating member 20 has a semicircular bar shape, and the member end face 22 has a substantially semicircular shape. As shown in FIG. 3, the heat radiating member 20 is arranged in the cylindrical case 50 so that the arc-shaped portion (heat radiating fin 24 portion) of the heat radiating member 20 is along the inner surface of the cylindrical case 50. That is, the member end surface 22 is disposed and fixed closer to the peripheral frame portion than the center of the disc portion 63.

  As shown in FIG. 2, in the cylindrical case 50, the case end portion 51b on the cap portion 60b side is fixed to the inner surface of the disc portion 63b with an adhesive or the like. A case fixing portion 230 for fixing the case end portion 51b is provided on the inner surface of the disc portion 63b of the base portion 60b. That is, the cylindrical case 50 and the heat radiating member 20 are fixed to the disc part 63b on the base part 60b side.

  Further, a packing 90b is provided on the outer periphery of the cylindrical case 50 in the vicinity of the annular base end surface 64b, which is the end of the side wall portion 61b of the base portion 60b, to close the space between the side wall portion 61b and the outer periphery of the cylindrical case 50.

  As shown in FIG. 2, the case end 51a on the base 61a side is not fixed to the base 61a. A gap portion 210 having a predetermined length L1 is formed between the other case end portion 51a of the cylindrical case 50 and the inner surface of the disc portion 63a. The case end 51a is housed in a space 240a formed between the side wall 61a and the outer peripheral surface of the heat dissipation member 20.

  As described above, the base portion 60 a is fixed to the heat radiating member 20 with an adhesive or a screw, and is in a state where a gap of the dimension L1 is opened between the case end portion 51 a of the cylindrical case 50. The height of the side wall portion 61a of the base portion 60a is defined as a dimension L2.

  As shown in FIG. 2, in the cylindrical case 50, the case end 51b is fixed to the base 60b, but the case end 51a is not fixed to the base 60a.

  As described above, the base portion 60b is fixed to the heat radiating member 20 and is fixed to one end (case end portion 51b) of the cylindrical case 50. However, the base portion 60a is connected to the other end (case end portion 51a) of the cylindrical case 50. ), The cylindrical case 50 can be contracted (expanded / contracted) without being affected by the contraction (expansion / contraction) of the heat dissipation member 20. It becomes.

  For example, when the cylindrical case 50 expands due to an increase in temperature, the case end 51a that is not fixed can extend the gap 210 in the P1 direction. Therefore, the cylindrical case 50 is not bent.

  When the cylindrical case 50 contracts due to a decrease in temperature, the case end portion 51a contracts toward the P2 side at the portion where the side wall portion 61a and the case end portion 51a vicinity of the cylindrical case 50 overlap (overlapping portion 250). be able to. Therefore, the cylindrical case 50 does not warp.

For example, it is assumed that the cylindrical case 50 is made of polycarbonate. The linear expansion coefficient of polycarbonate is 7.0 × 10 ⁻⁵ cm / ° C. (that is, 0.007 mm / ° C.). It is assumed that the temperature of the LED lamp 200 during normal operation is 25 ° C., and the lamp length of the LED lamp 200 is 1198 mm at 25 ° C.

  When the temperature of the LED lamp 200 rises to 85 ° C. from the normal time (25 ° C.) due to heat generated by the LED light source 30, the temperature rises to 85 ° C.−25 ° C. = 60 ° C. In this case, the polycarbonate cylindrical case 50 extends 0.007 mm / ° C. × 60 ° C. = 0.42 mm.

  Further, when the temperature of the LED lamp 200 is lowered to −20 ° C. due to environmental change or the like from the normal time (25 ° C.), it is lowered by 25 ° C .− (− 20 ° C.) = 45 ° C. In this case, the polycarbonate cylindrical case 50 contracts by 0.007 mm / ° C. × 45 ° C. = 0.315 mm.

  Here, the maximum width in which the cylindrical case 50 extends is LM1, and the successive width in which the cylindrical case 50 contracts is LM2. As described above, it is assumed that the cylindrical case 50 extends at a maximum of 0.42 mm (LM1 = 0.42 mm) and contracts at a maximum of 0.315 mm (LM2 = 0.315 mm). In the LED lamp 200 according to the present embodiment, even when the cylindrical case 50 extends up to 0.42 mm, the case end 51a does not collide with the inner surface of the disc part 63a of the base part 60a, and the cylindrical case 50 It is necessary to form the case end 51a so that it does not come off the base end face 64a portion of the base part 60a even when it is shrunk by a maximum of 0.315 mm.

  Specifically, the state of the LED lamp 200 in FIG. 2 is a state where the temperature is 25 ° C. At this time, the width L1 of the gap portion 210 is set to satisfy L1> LM1 (= 0.42 mm), and the width L3 of the overlapping portion 250 is set to satisfy L3> LM2 (0.315 mm). Then, the height L2 of the side wall part 61a becomes larger than the length obtained by adding LM1 and LM2. That is, L2> LM1 (0.42 mm) + LM2 (0.315 mm).

  By forming the LED lamp 200 in this way, even when the cylindrical case 50 expands due to thermal expansion, the cylindrical case 50 does not collide with the base 60a and bends, and even when it is shortest due to thermal contraction, it is detached from the base 60a. There is no end.

  As described above, the LED lamp 200 is designed in consideration of the length of the cylindrical case 50, the height of the side wall portion 61, the size of the gap portion 210, the size of the overlapping portion 250, the thermal expansion coefficient of the heat radiating member 20, and the like. .

  The L-shaped terminal 70 is fixed to the base 60 a by press-fitting or bonding, and the LED light source 30 can be turned on by being connected by the LED light source substrate 40 and the lead wire 71.

  The T-shaped pin 80 is fixed to the base portion 60b by press-fitting or bonding, and is a terminal that is connected to the heat dissipation member 20 or the like and grounds the LED lamp 200.

  The packings 90 a and 90 b are sandwiched between the side wall parts 61 a and 61 b of the base parts 60 a and 60 b and the outer peripheral surface of the cylindrical case 50, and prevent insects and dust from entering the LED lamp 200.

  As described above, in the LED lamp 200 according to the present embodiment, at least one of the base part 60a or the base part 60b is not directly fixed to the cylindrical case 50 that covers the LED module 100, and the distance (gap between the cylindrical case 50 and the gap) It was attached to the heat dissipation member 20 so as to keep the portion 210). Therefore, when the cylindrical case 50 expands and contracts (particularly expands), it is possible to extend in the longitudinal direction, and to prevent the ring shape of the cylindrical case 50 from being deformed or deformed by bending in the longitudinal direction. Can do.

  Further, if the heat dissipating member 20 is made of aluminum, the change in the overall length at an ambient temperature difference of 50 ° C. is 2 mm or less, exceeding the standard value (the change in the overall lamp length at an ambient temperature difference of 50 ° C. is 2 mm or less). There is no end. Further, as described above, the cylindrical case 50 is configured to be extendable and contractable without causing bending or warping regardless of the change in the overall length of the heat dissipation member 20. Therefore, the LED lamp 200 according to the present embodiment has a standard length of the lamp regardless of the thermal expansion and contraction of the cylindrical case 50 (change in the total length of the lamp at an ambient temperature difference of 50 ° C. is 2 mm or less. ) There is no change.

  In the present embodiment, a case has been described in which a plurality of LED light sources 30 are mounted in a straight line on the LED light source substrate 40. However, the arrangement positions of the LED light sources 30 and the quantity of the LED light sources 30 are the LED lamps. It can be determined as appropriate according to the light distribution characteristics of 200, the light output characteristics, and the like.

  In the present embodiment, the case where the base part 60b is fixed to the cylindrical case 50 and the base part 60a is not fixed to the cylindrical case 50 (the base part 60a is fixed only to the heat radiating member 20) has been described. 60a may be fixed to the cylindrical case 50, and the base part 60b may not be fixed to the cylindrical case 50 (the base part 60b is fixed only to the heat dissipation member 20). Alternatively, the base parts 60 a and 60 b may be fixed to the heat radiating member 20 without being fixed to the cylindrical case 50.

  According to the LED lamp 200 according to the present embodiment, in the straight tube LED lamp using a light emitting diode (LED light source 30) as a light source, the heat radiating member 20 and the cap portions 60a, 60b at both ends are fixed. A gap portion 210 is positively provided between the cylindrical case 50 (circular tube) that houses the heat radiating member 20 and the base portions 60a and 60b. Thereby, even if the cylindrical case 50 is thermally expanded due to the heat generated by the LED light source 30, the total length of the LED lamp 200 is not changed more than the regulation due to the gap provided in the cylindrical case 50 and the base part 60. Deflection of the LED lamp 200 due to the difference in thermal expansion coefficient between the heat dissipation member 20 and the cylindrical case 50 can be suppressed.

Embodiment 2. FIG.
In the present embodiment, the shape of the base portion 60 of the first embodiment is changed. FIG. 4 is a cross-sectional view of the LED lamp 201 according to the present embodiment. FIG. 5 is an exploded perspective view of the LED lamp 201 according to the present embodiment, showing the cylindrical case 50 and the base parts 60a and 60b. In FIG. 5, the internal configuration of the cylindrical case 50 is omitted.

  FIG. 4 is a diagram corresponding to FIG. 2 described in the first embodiment. The same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted. The configuration different from that of the first embodiment, particularly the configuration and shape of the base 60 will be described.

  The LED lamp 201 includes a heat radiating member 20, an LED module 100 attached to the heat radiating member 20, and a cylindrical case 50 that houses the heat radiating member 20 and the LED module 100. Moreover, it is provided with base parts 601a and 601b that are attached to the member end faces 22 (22a and 22b) of the heat radiation member 20 and are provided so as to close both ends (case end parts 51a and 51b) of the cylindrical case 50.

  The base portion 601a has a tea tube lid shape including a disc portion 63a and a side wall portion 61a provided on the periphery of the disc portion 63a. The base portion 600b has a tea tube lid shape including a disc portion 63b and a side wall portion 61b provided on the periphery of the disc portion 63b. The shapes of the base part 601a and the base part 601b are different in the shape of the terminals provided on the surfaces of the disk parts 63a and 63b, but the other parts are substantially the same shape. The shapes of the base part 601a and the base part 601b are cap-shaped with a “U” cross section and a circular disk part 63 (bottom surface).

  As shown in FIG. 5, the base part 601 includes a groove part 67 cut out from the base end face 64, which is the upper end face of the side wall part 61, toward the disc part 63. The groove portion 67 includes an annular opening 68 formed along the annular base end face 64 of the side wall portion 61, and includes a space portion 280 inside the side wall portion 61 from the opening 68 toward the disc portion 63. The case end 51 of the cylindrical case 50 is inserted into the space 280.

  As shown in FIG. 4, the base part 601b is bonded to the inner surface of the disk part 63b by fixing the member end face 22b of the heat radiating member 20 with an adhesive or screws, and the case end 51b is inserted into the groove part 67b. It is fixed with agents.

  In the base portion 601a, the member end surface 22a of the heat radiating member 20 is fixed to the inner surface of the disc portion 63a with an adhesive or a screw, and the case end portion 51a is inserted into the groove portion 67a. However, the case end 51a inserted into the groove 67a is not fixed, and the case end 51a can move (slide) in the space 280a in the groove 67a. Further, a gap portion 210 having a dimension L1 is formed between the inner surface of the disc portion 63a and the case end portion 51a.

  The base 601 a is fixed to the heat radiating member 20 with an adhesive or a screw, and is in a state where a gap of a dimension L 1 is opened between the base 601 a and the cylindrical case 50. Here, the depth of the groove of the groove portion 67a (concave portion) formed in the side wall portion 61a (circumferential frame portion) of the base portion 601a is defined as a dimension L2. The dimension of the portion (overlapping portion 250) inserted into the groove 67a in the vicinity of the case end 51a is L3.

  Similar to the first embodiment, the thermal expansion coefficient and length of the cylindrical case 50, the groove depth L2 of the groove portion 67a (corresponding to the height of the side wall portion 61), the dimension L1 of the gap portion 210, and the dimension of the overlapping portion 250. The LED lamp 201 is designed in consideration of L3, the thermal expansion coefficient of the heat radiating member 20, and the like. By designing the LED lamp 201 as described above, even if the cylindrical case 50 is thermally expanded due to the heat generated by the LED light source 30, the total length is a standard value (change in the total length of the lamp at an ambient temperature difference of 50 ° C. is 2 mm or less). It is possible to provide the LED lamp 200 that does not change as described above and does not bend.

  Thus, according to the LED lamp 201 according to the present embodiment, the base portion 601b is fixed to one end (case end portion 51b) of the cylindrical case 50 and fixed to the heat dissipation member 20 (member end surface 22b). The base part 601a is not fixed to the other end (case end part 51a) of the cylindrical case 50 with a gap of the dimension L1 open, and is attached to the heat radiating member 20 (member end face 22a). Therefore, as in the first embodiment, the cylindrical case 50 can be expanded and contracted without being affected by the expansion and contraction of the heat dissipation member 20.

  Further, according to the LED lamp 201 according to the present embodiment, the case end 51a is inserted into the groove 67a, so that it is not necessary to use the packing 90 or the like. Thereby, the case edge part 51a can be expanded-contracted within the groove part 67a more smoothly.

  Although Embodiments 1 and 2 have been described above, these two embodiments may be combined. Alternatively, one of these embodiments may be partially implemented. Alternatively, these two embodiments may be partially combined.

  20 heat radiation member, 22 member end surface, 23 substrate mounting surface, 24 heat radiation fin, 30 LED light source, 40 LED light source substrate, 50 cylindrical case, 51 case end, 60 base part, 61 side wall part, 63 disc part, 64 base End face, 67 groove part, 68 opening part, 70 L-shaped terminal, 71 lead wire, 80 T-shaped pin, 90 packing, 100 LED module, 200, 201 LED lamp, 210 gap part, 220 fixing part, 230 case fixing part, 240 Space part, 250 overlapping part, 280 space part, 601 base part.

Claims (3)

A rod-shaped heat dissipation member to which a long LED substrate is attached, and a heat dissipation member having end faces on both sides in the longitudinal direction;
A cylindrical case that houses at least a part of the heat dissipation member therein, and a cylindrical case having case ends on both sides in the longitudinal direction;
A first cap portion having a tea tube lid shape including a first disc portion and a first side wall portion provided on a periphery of the first disc portion, wherein one case end portion of the cylindrical case is A first base part fixed to the one end of the case so as to cover and an inner surface of the first disc part fixed to one end face of the heat dissipation member;
A second cap portion having a tea tube lid shape including a second disc portion and a second side wall portion provided at a peripheral edge of the second disc portion, the inner side of the second disc portion Is fixed to the other end surface of the heat dissipating member, and a gap portion having a predetermined length is formed between the other case end portion of the cylindrical case and the inner surface of the second disc portion. A straight tube lamp comprising a second base part. The other case end of the cylindrical case is
The straight tube lamp according to claim 1, wherein the straight tube lamp is housed in a space formed between the second side wall and the outer peripheral surface of the heat radiating member. The second base part is
An end surface of the second side wall portion, the annular end surface facing the second disc portion, and a groove formed from the end surface toward the second disc portion,
The straight tube lamp according to claim 1, wherein the other case end of the cylindrical case is housed in the groove.

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