JP2013149404A - Lighting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lighting device 1 that is excellent in heat radiation efficiency, has a light widening in a ceiling direction and can restrain axial deflection to small.SOLUTION: In a straight tube type lighting device 1 including light-emitting elements 8 arranged in a straight tube 4, a plurality of boards 7 for mounting the light-emitting elements 8, a heat sink 13 for supporting the boards 7, and a lamp cover 14 arranged at a light-emitting face side, the heat sink 13 has a contact plate 14a come in contact with back faces of the boards 7, a heat radiation plate 14b exposed to the air and radiating heat generated from the light-emitting elements 8 to the air, and a plurality of heat transfer plates 14c, 14d come in contact with the contact plate 14a and the heat radiation plate 14b and transmitting the heat generated from the light-emitting elements 8 from the contact plate 14a to the heat radiation plate 14b. The plurality of heat transfer plates 14c, 14d are approximately in parallel with each other, and are respectively connected with the contact plate 14a at an approximately right angle.

Description

  The present invention relates to a lighting device in which a light emitting element is housed in a linear tube.

  As a lighting device provided with a straight tube, a straight tube fluorescent lamp is conventionally known. However, from the viewpoint of extending the life and saving energy, an LED (Light Emitting Diode) or organic electroluminescence (organic EL) is used. Etc.) has been proposed (see, for example, Patent Document 1).

  Further, Patent Document 2 discloses a straight tube type LED lamp in which a substrate on which a light emitting element (LED) is mounted is disposed inside a cover formed in a light-transmitting substantially cylindrical shape.

JP 2011-108378 A JP 2011-29051 A

  In the illuminating device described in Patent Document 2 and the like, the substrate on which the LED is mounted is sealed inside a light-transmitting cover formed in a substantially cylindrical shape, and thus heat generated from the LED is difficult to escape. As a temperature characteristic of the LED, there is a risk that the light emission efficiency is lowered when the temperature rises.

  Further, in order to efficiently dissipate the heat generated from the LED in the straight tube type LED lighting device, the heat radiating member (heat sink) is generally made by extrusion molding of aluminum. While the weight of the conventional fluorescent lamp is heavier than that of the fluorescent lamp, the cover of the conventional fluorescent lamp is made of rigid glass, so that there is a risk that the straight-tube LED lamp has a large deflection.

  Therefore, the problem to be solved by the present invention is to provide an illuminating device that is excellent in heat dissipation efficiency and can suppress axial deflection.

  A straight tube type having a light emitting element provided in a straight tube, a plurality of substrates on which the light emitting elements are mounted, a heat sink supporting the substrate, and a lamp cover provided on the light emitting surface side In the lighting device, the heat sink is in contact with the back side of the substrate, a heat radiating plate that is exposed to the outside air and emits heat generated in the light emitting element, and is in contact with the contact plate and the heat radiating plate. A plurality of heat transfer plates for transferring heat from the contact plate to the heat radiating plate, wherein the plurality of heat transfer plates are substantially parallel to each other and connected to the contact plate at a substantially right angle. .

  Further, the heat radiating plate has an arc-shaped curved surface, and the plurality of heat transfer plates and the contact plate have a substantially box-shaped cross-sectional shape.

  Further, the ratio of the height of the heat transfer plate and the width dimension of the contact plate is between 1: 3 and 1: 1.

  Further, the height of the upper end of the contact plate is not less than 1/3 and not more than 2/3 of the straight pipe outer diameter from the heat radiating plate side facing the outside toward the inner diameter.

  Further, at least one of the plurality of heat transfer plates connecting the contact plate and the heat radiating plate is provided with a curved reinforcing portion.

  ADVANTAGE OF THE INVENTION According to this invention, while being excellent in heat dissipation efficiency, the illuminating device which can suppress the axial deflection | deviation small can be provided.

  The plurality of heat transfer plates are parallel to each other and connected to the contact plate at right angles, or the heat radiating plate has an arc-shaped curved surface, and the plurality of heat transfer plates, the contact plate, And at least one of the plurality of heat transfer plates connecting the contact plate and the heat radiating plate is provided with a curved reinforcing portion. Therefore, it is possible to provide an illuminating device that can suppress the axial deflection to be small.

  Further, the ratio of the height of the heat transfer plate and the width dimension of the contact plate is between 1: 3 and 1: 1, or the heat radiating plate in which the height of the upper end of the contact plate faces the outside. From the side toward the inner diameter, it is possible to provide an illuminating device that spreads light also in the ceiling direction by being 1/3 or more and 2/3 or less of the outer diameter of the straight pipe.

(A) is a bottom view of the lighting device according to the embodiment of the present invention, (b) is a bottom view of the lighting device with the wiring cover removed, and (c) is a bottom view of the lighting device seen through the lamp cover. It is. (A) is the bottom view which expanded a part of illuminating device which concerns on embodiment of this invention, and saw through the lamp cover, (b) is the board | substrate connector provided on the board | substrate of an illuminating device, and wiring between board | substrates It is a schematic diagram which shows the connection method with the wiring side connector connected to both ends. It is the enlarged view which expanded and saw the periphery of the dummy base (state which removed the wiring cover) of the electric power feeding side of the illuminating device which concerns on embodiment of this invention. It is arrow sectional drawing of the AA direction of FIG. It is arrow sectional drawing of the BB direction of FIG. It is a schematic diagram which shows the state before fitting a lamp cover to a heat sink. It is a schematic diagram which shows the state immediately before a lamp cover fits into a heat sink. It is a schematic diagram which shows the state which pinched the lamp cover in the radial direction trying to remove the lamp cover from the heat sink. The lighting device according to the embodiment of the present invention is locked to a dual-purpose socket provided in an existing instrument, and the power supply cable is housed in a groove provided in a dummy base on the power supply side, and the lighting device (device-side connector) It is a schematic diagram which shows the state by which the power supply side connector is not connected to. It is a schematic diagram which shows the state which the power supply side connector connected to the illuminating device (apparatus side connector) further from the state shown to FIG. 7A. It is a schematic diagram which shows the state which attached the wiring cover from the state shown to FIG. 7B. It is sectional drawing which cut | disconnected the illuminating device in the position of the wiring cover of FIG. 7C. It is a schematic diagram (the 1) of the existing fixture which mounts 2 lighting apparatuses which concern on embodiment of this invention. It is a schematic diagram (the 2) of the existing fixture which mounts 2 lighting apparatuses which concern on embodiment of this invention.

  Next, embodiments of the present invention will be described in detail with reference to the drawings as appropriate. In each figure, common portions are denoted by the same reference numerals, and redundant description is omitted.

  FIG. 1A shows a bottom view of the lighting device 1 according to the embodiment of the present invention. Normally, the lighting device 1 is installed at a position higher than the height of human eyes, such as the ceiling of a building, and the bottom surface of the lighting device 1 is visible to humans. Therefore, in FIG. 1A, the bottom side of the surface normally visible to humans is shown. As shown in FIG. 1A, the lighting device 1 includes a linear tube 4 from which illumination light is radiated, and a pair of bottomed cylindrical portions 2c and 3a that close both ends of the linear tube 4. ing. A locking portion 3b is provided on the bottom surface of the bottomed cylindrical portion 3a, and a dummy base (non-power feeding side) 3 is configured by the bottomed cylindrical portion 3a and the locking portion 3b. A locking portion 2d is provided on the bottom surface of the bottomed cylindrical portion 2c, and a dummy base (feeding side) 2 is constituted by the bottomed cylindrical portion 2c, the locking portion 2d, and the wiring cover 2a. The locking part 2d of the dummy base (power supply side) 2 and the locking part 3b of the dummy base (non-power supply side) 3 can be attached to an existing instrument to which a conventional straight tube fluorescent lamp can be attached. .

  FIG. 1B shows a bottom view of the lighting device 1 in a state where the wiring cover 2a (see FIG. 1A) is removed from the dummy base (feeding side) 2. FIG. The device-side connector 6 is provided on the side of the bottomed cylindrical portion 2 c of the dummy base (power feeding side) 2. The apparatus-side connector 6 is provided with power supply terminals 6a and 6b, and is connected to a power supply-side connector that supplies power from an external power supply. Although details will be described later, the power supply side connector can be connected to the apparatus side connector 6 by being inserted from the radial direction of the bottomed cylindrical portion 2c. Grooves 5a and 5b are provided along the circumferential direction on the side portion of the bottomed cylindrical portion 2c of the dummy base (feeding side) 2. The grooves 5 a and 5 b are provided on both sides of the device-side connector 6.

  FIG. 1C shows a bottom view of the lighting device 1 in a state where the lamp cover 13 of the straight tube 4 is seen through. A lamp cover 13 is provided on the bottom side of the straight tube 4. The lamp cover 13 transmits illumination light. The illumination light is emitted from a light emitting element 8 such as an LED or an organic electroluminescence. In the example of this embodiment, an LED is used as the light emitting element 8. The light emitting element 8 is provided on the surface of a plurality (four in the example of FIG. 1C) of the substrates 7 (71, 72, 73, 74). The plurality of substrates 7 (71, 72, 73, 74) are supported by the heat sink 14 and arranged in a line along the longitudinal direction of the linear tube 4. The plurality of substrates 7 (71, 72, 73, 74) have a rectangular shape with long sides along the longitudinal direction of the linear tubular body 4 in a bottom view (corresponding to the bottom view), and The rectangular short sides of the adjacent substrates 7 (71, 72, 73, 74) face each other. Each of the plurality of substrates 7 (71, 72, 73, 74) includes a plurality of light emitting elements 8 and on-board connectors 9 (91, 92, 93, 94, 95, 96) connected to the light emitting elements 8. Is provided. The on-board connector 9 (91, 92, 93, 94, 95, 96) is provided in the vicinity of the short side. On-board connectors 9 (91, 92, 93, 94) of adjacent boards 7 (71, 72, 73, 74) are connected by inter-board wirings 10a, 10b. Thereby, all the several light emitting elements 8 on the some board | substrate 7 (71, 72, 73, 74) can be connected to the connection form which connected in series or parallel or those. The on-board connectors 9 (95, 96) of the board 7 (71) are connected to the power supply terminals 6a, 6b of the apparatus-side connector 6 by the inter-board connector wirings 11a, 11b. Thereby, all the light emitting elements 8 on the plurality of substrates 7 (71) and further the substrates 7 (72, 73, 74) can be connected to the apparatus-side connector 6.

  FIG. 2A is a bottom view in which a part of the illumination device 1 according to the embodiment of the present invention is enlarged and the lamp cover 13 is seen through. As shown in FIGS. 2A and 1C, the majority of the plurality of light emitting elements 8 are centered on the central axis along the longitudinal direction of the rectangle of the substrate 7 (71, 72, 73, 74). It is arranged to come. However, as an exception, the light emitting element 8 (81, 82, 83, 84) provided in the vicinity (side) of the on-board connector 9 (91, 92, 93, 94) is located on a straight line of the central axis. It's off. Specifically, as shown in FIG. 2A, the on-board connectors 91 and 93 are connected by the inter-board wiring 10a. The on-board connectors 91 and 93 are disposed on the same side with respect to the light emitting elements 81 and 83 (upper side in the example of FIG. 2A). The centers of the light-emitting elements 81 and 83 are shifted from a straight line of the central axis along the longitudinal direction of the rectangle of the substrate 7 (71 and 72), and are arranged below the central axis in the example of FIG. Has been. On the other hand, the on-board connectors 92 and 94 are connected by the inter-board wiring 10b. The on-board connectors 92 and 94 are arranged on the same side with respect to the light emitting elements 82 and 84 (lower side in the example of FIG. 2A). The centers of the light-emitting elements 82 and 84 are shifted from the straight line of the central axis along the longitudinal direction of the rectangle of the substrate 7 (71 and 72), and are arranged above the central axis in the example of FIG. ing. The pair of on-board connectors 91 and 92 and 93 and 94 arranged opposite to each other with the longitudinal center axis therebetween are shifted in the longitudinal direction. Further, the arrangement of the on-board connectors 91 and 93 and 92 and 94 provided in the vicinity of both ends of the board 7 (72, 73) is shifted from that of the on-board connectors 91 and 92, 93 and 94, respectively. It arrange | positions so that arrangement | positioning may become the substantially same positional relationship in the same direction with respect to a longitudinal direction. By arranging as described above, the heat sink 14 (the end face (long side) of the substrate 7 (71, 72, 73, 74)) is made without increasing the short side of the substrate 7 (71, 72, 73, 74). The distance from the on-board connector 9 (91, 92, 93, 94) to a predetermined value or more can be secured, and the on-board connector 9 (91, 92, 93) from the light emitting element 8 (81, 82, 83, 84) can be secured. , 94) can be secured above a predetermined value.

  FIG. 2B shows a method for connecting the on-board connector 9 (91, 92, 93, 94) and the inter-board wiring 10b (10a). Wiring-side connectors 10c are connected to both ends of the inter-substrate wirings 10a and 10b. The wiring-side connector 10c is inserted into the opening 9a of the on-board connector 9 (91, 92, 93, 94) and slid in the longitudinal direction (arrow direction) of the on-board connector 9 so that the on-board connector 9 (91, 92 , 93, 94) and the inter-substrate wirings 10a, 10b are connected. Thereby, the electrical connection of the board | substrates 7 (71, 72, 73, 74) can be performed simply and rapidly. The longitudinal direction of the on-board connector 9 (91, 92, 93, 94) is parallel to the rectangular longitudinal direction of the substrate 7 (71, 72, 73, 74).

  FIG. 3 shows an enlarged view of the periphery of the dummy base 2 on the power supply side with the wiring cover 2a (see FIG. 1A) removed. As shown in FIG. 3 and FIG. 1 (c), most of the plurality of light emitting elements 8 are arranged so that their centers are on the central axis along the longitudinal direction of the rectangle of the substrate 7 (71). However, as an exception, the light emitting element 8 (85) provided in the vicinity (side) of the on-board connector 9 (95) is deviated from the straight line of the central axis. Specifically, as shown in FIG. 3, the on-board connector 95 and the power supply terminal 6b of the apparatus-side connector 6 are connected by the inter-board connector wiring 11b. The center of the light emitting element 85 is displaced from a straight line of the central axis along the longitudinal direction of the rectangle of the substrate 7 (71), and is arranged above the central axis in the example of FIG. By arranging as described above, the distance from the heat sink 14 (the end surface (long side) of the substrate 7 (71)) to the on-board connector 9 (95) can be increased without increasing the short side of the substrate 7 (71). The distance from the light emitting element 8 (85) to the on-board connector 9 (95) can be secured above a predetermined value.

  The on-board connector 96 and the power supply terminal 6a of the apparatus-side connector 6 are connected by the inter-board connector wiring 11a. The on-board connector 9 (95, 96) and the inter-board connector wiring 11b (11a) are connected by the on-board connector 9 (91, 92, 93, 94) shown in FIG. Similarly to the connection method 10b (10a), the wiring-side connector 10c connected to one end of the inter-board connector wiring 11b (11a) is inserted into the opening 9a of the on-board connector 9 (95, 96), and the on-board connector 9 ( 95) slide in the longitudinal direction. Thereby, the electrical connection of the apparatus side connector 6 and the board | substrate 7 (71) can be performed simply and rapidly. The longitudinal direction of the on-board connector 9 (95) is parallel to the rectangular longitudinal direction of the substrate 7 (71). On the other hand, the longitudinal direction of the on-board connector 9 (96) is not parallel to the rectangular longitudinal direction of the board 7 (71) but is inclined. Furthermore, it may be a right angle or may be tilted beyond a right angle. More preferably, as shown in FIG. 3, the direction in which the board connector 9 (96) is inserted is opposed to the apparatus-side connector 6 and is inclined in the outward direction with respect to the longitudinal direction of the board. By providing in, the inter-connector wiring 11a connected from the apparatus-side connector 6 can be more easily inserted. The on-board connector 9 (96) is disposed closer to the rectangular short side of the board 7 (71) than the on-board connector 9 (95) and the light emitting element 8 (85). The internal space of the linear tube 4 in which the substrate 7 (71, 72, 73, 74) is disposed and the space in which the apparatus-side connector 6 is disposed are partitioned by a partition wall 12. For this reason, the board connector wirings 11 a and 11 b are passed through the wiring guide holes 12 a and 12 b provided in the peripheral part of the partition wall 12. Since the longitudinal direction of the on-board connector 9 (96) is not parallel to the rectangular longitudinal direction of the substrate 7 (71) and is inclined, the on-board connector 9 ( 96). In addition, the inclination allows the light emitting element 8 (85) to be disposed close to the rectangular short side of the substrate 7 (71), and the range in which the light emitting element 8 can be disposed on the substrate 7 (71) is widened. it can.

  FIG. 4 is a cross-sectional view taken along the line AA in FIG. The device-side connector 6 is provided with the ground direction facing up and down. The device-side connector 6 is disposed on the inner side of the dummy base outermost peripheral surface 2b. Grooves 5 a and 5 b are provided on both sides of the device-side connector 6. The groove bottom surfaces 5c of the grooves 5a and 5b are convexly curved outward in the radial direction. The depths of the grooves 5a and 5b become shallower as the distance from the device-side connector 6 increases. One end of each of the grooves 5a and 5b is disposed in the vicinity of the device-side connector 6, and the other end of each of the grooves 5a and 5b is the ceiling side on the outermost peripheral surface 2b of the dummy base (the side of the bottomed cylindrical portion 2c). And facing each other on the ceiling side.

  FIG. 5 shows a cross-sectional view in the direction of arrows BB in FIG. The straight tubular body 4 includes a lamp cover 13 provided on the ground side in the top-and-bottom direction and a heat sink 14 provided on the ceiling side. A substrate 7 having a light emitting element 8 provided on the surface side is disposed in the straight tube 4. The substrate 7 is supported by the heat sink 14 with the front side facing down. The lamp cover 13 irradiates the illumination light emitted from the light emitting element 8 while allowing a part of the illumination light to be reflected and scattered while being uniformly dispersed outside. The lamp cover 13 includes an arc portion 13c having a curved surface in an arc shape on the ground side, an abutment portion 13b provided at both ends of the arc portion 13c and abutting against the tip end portion of the flange portion 14g of the heat sink 14, and a contact thereof. A flange portion 13a that is provided at the inner end of the contact portion 13b and engages with the flange portion 14g of the heat sink 14 is formed.

  The lamp cover 13 may be irradiated with the irradiation light emitted from the light emitting element 8 to the outside. Increasing the transparency of the lamp cover 13 (making it more transparent) increases the luminous flux as a lamp. On the contrary, when the transparency of the lamp cover 13 is lowered, the irradiation range is expanded.

  The heat sink 14 is provided on the back side of the substrate 7. The heat sink 14 is in contact with the contact plate 14a that is in contact with the entire back surface of the substrate 7, the heat radiating plate 14b that is exposed to the outside air and releases the heat generated in the light emitting element 8, and the contact plate 14a and the heat radiating plate 14b. 8 includes a plurality of heat transfer plates 14c, 14d, and 14e that transmit heat generated at 8 to the heat dissipation plate 14b from the contact plate 14a. Both ends of the contact plate 14a are bent and support both ends of the substrate 7. The heat sink 14b has a surface curved in an arc shape on the ceiling in the vertical direction. On this surface, irregularities are formed such that a plurality of ridges (grooves) are continuous in the circumferential direction, and the exposed area to the outside air is increased to increase the heat radiation efficiency. The plurality of heat transfer plates 14c, 14d, and 14e are parallel to each other and are connected to the contact plate 14a at a right angle. Since the contact plate 14a, the heat radiating plate 14b, and the heat transfer plates 14c and 14d form a substantially box-shaped cylindrical shape, the axial deflection of the linear tubular body 4 can be suppressed. And the heat-transfer plate 14e provided inside this cylindrical shape functions as a beam, and can further suppress the deflection in the axial direction of the linear tubular body 4. The heat transfer plate 14e is provided with a curved reinforcing portion 14f, and the axial deflection of the linear tubular body 4 can be further suppressed. However, the plurality of heat transfer plates 14c, 14d, and 14e and the contact plate 14a do not have to be perpendicular as long as they are connected so as to suppress deflection.

  The flanges 14g are provided at both ends of the heat radiating plate 14b. The flange portions 13a are provided at both ends of the lamp cover. The flange portion 13a of the lamp cover 13 protrudes outward, and the flange portion 14g of the heat sink 14 protrudes inward. The lamp cover 13 and the heat sink 14 are locked to each other by engaging the flange part 13a of the lamp cover 13 with the flange part 14g of the heat sink 14 from the inside. The protruding width W3 of the flange portion 13a of the lamp cover 13 is substantially equal to the protruding width W4 of the flange portion 14g of the heat sink 14 (W3≈W4). The side of the lamp cover 13 where the flange 13a does not protrude is opposed to the heat transfer plates 14c and 14d, and a protrusion 14h is provided on the surface of the heat transfer plates 14c and 14d on the flange 13a side. ing. The width (height) W1 of the protrusion 14h is substantially equal to the width W2 of the gap between the flange 13a and the heat transfer plates 14c and 14d (W1≈W2), and the protrusion 13a of the lamp cover 13 protrudes. The width W3 is substantially equal to the protruding width W4 of the flange 14g of the heat sink 14 (W1≈W2≈W3≈W4). The protrusion 14h is provided at a height H1 between the height of the lower end of the flange portion 14g and the height H3 of the upper end of the contact plate 14a (H1> H3). More specifically, the height H1 of the upper end of the protrusion 14h is equal to or lower than the height H2 of the lower end of the contact portion 13b (H1 ≦ H2). According to this protrusion 14h, it is possible to prevent the engagement of the flanges 13a and 14g from being disengaged.

  Further, the height H2 of the lower end of the contact portion 13b is higher than the height H3 of the upper end of the contact plate 14a (H2> H3). And a part of protrusion 14h vicinity of the heat exchanger plates 14c and 14d has opposed a part of circular arc part 13c. As a result, a space 15 sandwiched between a part of the heat transfer plates 14c and 14d near the protrusion 14h and a part of the arc part 13c is generated. With this space 15, the illumination light can be irradiated in a direction closer to the ceiling in the vertical direction. And the tendency of this irradiation can be strengthened by reducing the height H3 of the upper end of the contact plate 14a, that is, by reducing the height of the substrate 7 (closer to the ground). If 8 is too close to the lamp cover 13, a sufficient light diffusion effect cannot be obtained by the lamp cover 13, and each light of the light emitting element 8 is emphasized. Instead of shining, it becomes a way of shining. Therefore, by adjusting the height of the substrate 7 in the straight tube 4, the illumination intensity profile of illumination light can be changed to a desired profile, but the light in the ceiling direction that makes the room feel brighter In order to make the lamp cover 13 light properly, the height H3 of the upper end of the contact plate 14a is desirably 1/3 or more or 2/3 or less of the straight pipe outer diameter. When the height H3 of the upper end of the contact plate 14a is 1/3 or more or 2/3 or less of the straight pipe outer diameter, the light toward the ceiling that makes the room feel bright and the way the lamp cover 13 shines are made suitable. There is an effect that can be.

  In addition, the space 15 sandwiched between a part of the heat transfer plates 14c and 14d in the vicinity of the protrusion 14h and a part of the arc part 13c is also an important factor in the spread of light in the ceiling direction. In order to configure the space 15 for obtaining the spread of light to the surface, the ratio of the height of the heat transfer plates 14c and 14d and the width dimension of the contact plate 14a is between 1: 3 and 1: 1. Is desirable. When the ratio of the height of the heat transfer plates 14c and 14d and the width dimension of the contact plate 14a is between 1: 3 and 1: 1, a space 15 for obtaining a suitable spread of light in the ceiling direction is formed. There is an effect that can be.

  FIG. 6A shows a state before the lamp cover 13 is fitted to the heat sink 14. FIG. 6B shows a state immediately before the lamp cover 13 is fitted into the heat sink 14. By pressing the lamp cover 13 against the heat sink 14, the flange 13a is pushed between the flange 14g and the protrusion 14h while being rubbed by both the flange 14g and the protrusion 14h. Then, as shown in FIG. 5, the flange portion 13 a and the flange portion 14 g are engaged with each other, and the lamp cover 13 is attached to the heat sink 14. In addition, with the lamp cover 13 and the heat sink 14 shifted in the axial direction, the end faces are engaged with each other, and the lamp cover 13 and the heat sink 14 are slid in the axial direction while engaging the lamp cover 13 so that the lamp cover 13 is moved to the heat sink 14. May be fitted. However, for example, a straight tube illuminating device corresponding to a 110 W type straight tube fluorescent lamp has a length (full length) of about 2400 mm, so it is not easy to fit by sliding. Therefore, in this way, it can be said that the lamp cover 13 can be attached with a single touch of pushing into the heat sink 14 in the production and assembly of the lighting device 1.

  As described above, the light emitting element 8 provided in the linear tube 4, the plurality of substrates 7 on which the light emitting elements 8 are mounted, the heat sink 14 supporting the substrate 7, and the lamp provided on the light emitting surface side. In the straight tube illuminating device 1 having the cover 13 and forming the linear tube 4 by the combination of the heat sink 14 and the lamp cover 13, first flange portions 14 g are provided at both ends of the heat sink 14. Engagement with the second eaves part 13a, which is provided at both ends of the lamp cover 13 and engages from the inside of the first eaves part 14g in the space provided between the provided heat transfer plates 14c, 14d and the first eaves part 14g Thus, since the heat sink 14 and the lamp cover 13 are locked, the heat radiation efficiency is excellent, and the engagement assembly between the heat sink 14 and the lamp cover 13 can be facilitated. And an effect of preventing the edge of the lamp cover 13.

  FIG. 6C shows a state in which the lamp cover 13 is pinched in the radial direction in an attempt to remove the flange portion 13a of the lamp cover 13 from the flange portion 14g of the heat sink 14. The collar part 13a is detached from the collar part 14g. However, the flange 13a (contact portion 13b) contacts the heat transfer plate 14d. Even if the lamp cover 13 and the heat sink 14 are separated from each other and the flange 13a (abutting portion 13b) is slid on the heat transfer plate 14d while being in contact with the heat transfer plate 14d, the lamp cover 13 and the heat sink 14 are slid against the protrusion 14h. I can not let you. As described above, the lamp cover 13 cannot be easily removed from the heat sink 14, and is not accidentally removed.

  FIG. 7A shows a state in which the lighting device 1 according to the embodiment of the present invention is locked to a combined socket 16 provided in an existing fixture 22 (trough type) that is also used as a straight tube fluorescent lamp. The dual-purpose socket 16 is attached to the top plate 17. A top plate hole 17a is provided on the lighting device 1 side of the dual-purpose socket 16 of the top plate 17. A power supply cable 18 for supplying power from an external power source is passed through the top plate hole 17a. The top plate hole 17a is provided in the vicinity immediately above the groove 5b. The power supply cable 18 is guided directly below the power supply terminals 6a and 6b (device-side connector 6) through the groove 5b. The power supply terminals 6 a and 6 b (device-side connector 6) are provided on the side not facing (not facing) the top plate 17. A power supply side connector 19 is connected to the power supply cable 18. The power supply side connector 19 can be led to the vicinity of the power supply terminals 6a and 6b (device side connector 6).

  Next, as shown as a transition from FIG. 7A to FIG. 7B, the power supply side connector 19 is connected to the power supply terminals 6a and 6b (device side connector 6). Since the power supply terminals 6a and 6b (device-side connector 6) are provided on the side not facing (not facing) the top plate 17, the power-side connector 19 can be easily connected.

  Finally, as shown in FIG. 7C, the wiring cover 2a is attached to the main body of the dummy base (power feeding side). The power supply side connector 19 is completely hidden by the wiring cover 2a. In addition, the power supply cable 18 can be completely hidden as far as it is viewed from directly below the lighting device 1, and even when viewed from an obliquely lower side of the lighting device 1, only a part of the upper part of the power supply cable 18 is looked into, so that a neat aesthetic appearance is achieved. Can keep.

  FIG. 8 shows a cross-sectional view of the lighting device 1 cut at the position of the wiring cover 2a in FIG. 7C. Although the power feeding cable 18 passes through the groove 5b, it can also pass through the groove 5a like the power feeding cable 18a.

  FIG. 9A shows a schematic diagram of an existing fixture 20 on which two lighting devices 1 (1a, 1b) according to an embodiment of the present invention are mounted. The existing instrument 20 is a so-called inverted Fuji type existing instrument. An existing instrument 20 is attached to the ceiling 23. Since the center part of the existing instrument 20 is lower than the end part, disposing the power supply cable 18 on the center part side of the existing instrument 20 rather than disposing the power supply cable 18 on the end part side of the existing instrument 20. The power supply cable 18 can be made inconspicuous. That is, in the lighting device 1 (1a), the feeding cable 18 is passed through the groove 5a, and in the lighting device 1 (1b), the feeding cable 18 is passed through the groove 5b. Can keep.

  FIG. 9B shows a schematic diagram of an existing fixture 21 on which two lighting devices 1 (1a, 1b) according to an embodiment of the present invention are mounted. The existing instrument 21 is an existing instrument having a so-called umbrella. The existing instrument 21 is attached to the ceiling 23. An umbrella is attached to the end of the existing device 21, and the umbrella is lowered from the top plate (ceiling) 17. For this reason, the power feeding cable 18 can be made inconspicuous by arranging the power feeding cable 18 on the end side of the existing instrument 21 as compared with the case where the power feeding cable 18 is arranged on the center side of the existing instrument 21. That is, in the lighting device 1 (1a), the feeding cable 18 is passed through the groove 5b, and in the lighting device 1 (1b), the feeding cable 18 is passed through the groove 5a. Can keep.

1 Lighting device 2 Dummy base (power supply side)
2a Wiring cover 2b Dummy base outermost peripheral surface 2c, 3a Bottomed cylindrical part 2d, 3b Locking part 3 Dummy base (non-feeding side)
4 Straight tube 5a, 5b Groove 5c Groove bottom 6 Device side connector (male connector)
6a, 6b Feed terminals 7, 71, 72, 73, 74 Substrate 8 Light emitting element (LED)
9, 91, 92, 93, 94, 95, 96 On-board connectors 10a, 10b Inter-board wiring 10c Wiring-side connectors 11a, 11b Inter-board connector wiring 12 Bulkheads 12a, 12b Wiring guide holes 13 Lamp covers 13a, 14g Gutter 13b Contact portion 13c Arc portion 14 Heat sink 14a Contact plate 14b Heat sink 14c, 14d, 14e Heat transfer plate 14f Reinforcement portion 14h Protrusion 15 Space 16 Combined socket 17 Top plate 17a Top plate hole 18 Power supply cable 19 Power connector (female connector) )
20, 21, 22 Existing equipment 23 Ceiling

Claims (5)

  A straight tube type having a light emitting element provided in a straight tube, a plurality of substrates on which the light emitting elements are mounted, a heat sink supporting the substrate, and a lamp cover provided on the light emitting surface side In the lighting device, the heat sink is in contact with the back side of the substrate, a heat radiating plate that is exposed to the outside air and emits heat generated in the light emitting element, and is in contact with the contact plate and the heat radiating plate. A plurality of heat transfer plates that transmit the heat from the contact plate to the heat radiating plate, and the plurality of heat transfer plates are substantially parallel to each other and connected to the contact plates at substantially right angles, respectively. .   The heat radiating plate has an arc-shaped curved surface, and the plurality of heat transfer plates and the contact plate have a substantially box-shaped cross-sectional shape. Lighting device.   The lighting device according to claim 1 or 2, wherein a ratio of a height of the heat transfer plate and a width dimension of the contact plate is between 1: 3 and 1: 1.   The height of the upper end of the contact plate is 1/3 or more and 2/3 or less of the straight pipe outer diameter from the heat radiating plate side facing the outside toward the inner diameter. The lighting device according to claim 2.   The curved reinforcing portion is provided in at least one of the plurality of heat transfer plates connecting the contact plate and the heat radiating plate. Item 3. The lighting device according to Item 2.