JP6934622B2 - lighting equipment - Google Patents

Description

The present disclosure relates to luminaires.

Conventionally, a ceiling-embedded lighting fixture having a fixture body for accommodating a light source and being inserted into a ceiling-embedded hole with the opening of the fixture body facing vertically downward is widely known. Such luminaires are commonly referred to as downlights. For example, Patent Document 1 discloses a lighting fixture provided with a heat sink ASSY in which a plurality of plate-shaped heat radiation fins are inserted into each slit of a base plate having slits, and each heat radiation fin is sandwiched between two base plates. .. This lighting fixture has a structure in which a heat sink ASSY is mounted on a fixture body that houses a light source.

Japanese Unexamined Patent Publication No. 2014-22314

By the way, in a lighting fixture, since the light source generates heat when it is lit, it is an important issue to improve the heat dissipation of the fixture in order to suppress the temperature rise of the fixture. In particular, it is desired to improve heat dissipation without increasing the weight and size of the lighting equipment. The lighting fixture of Patent Document 1 still has room for improvement in heat dissipation.

The lighting fixture according to one aspect of the present disclosure is a light source, a celestial cylinder-shaped accommodating portion accommodating the light source, and at least a top portion of the accommodating portion, which is erected along the axial direction of the accommodating portion. Fixed to an instrument body having a plurality of plate-shaped heat radiation fins formed in one direction and a plurality of plate-shaped heat radiation fins formed along a second direction orthogonal to the direction, and one end of the instrument body located on the opening side of the accommodating portion in the first direction. At least a part of the plurality of heat radiation fins extends in a predetermined direction, which is one of the second directions, and projects outward from both ends of the predetermined direction of the accommodating portion. One end of the instrument body in the first direction is reduced in that direction at least on both sides of the predetermined direction, and at least a part of the gaps between adjacent heat radiation fins are open at both ends in the first direction. And.

According to the lighting fixture which is one aspect of the present disclosure, good heat dissipation can be obtained and the temperature rise of the fixture can be suppressed.

It is a perspective view which looked at the lighting fixture which is an example of Embodiment from above. It is a perspective view which looked at the lighting fixture which is an example of Embodiment from below. FIG. 5 is a cross-sectional view taken along the line AA in FIG. It is a perspective view which shows the upper part of the luminaire which is an example of an embodiment. It is a perspective view which shows the lower part of the luminaire which is an example of an embodiment. It is a perspective view which looked at the apparatus main body which is an example of an embodiment from above. It is a perspective view which looked at the apparatus main body which is an example of an embodiment from the bottom. It is an exploded perspective view of the upper part of the luminaire which is an example of an embodiment. It is an enlarged view of the portion where the slit of the instrument body which is an example of an embodiment is formed, and the vicinity thereof. It is a perspective view of the packing which is an example of an embodiment.

Hereinafter, an example of an embodiment of the lighting fixture according to the present disclosure will be described in detail with reference to the drawings. In the description of the embodiment, for convenience of explanation, the vertical upper side of the luminaire is "upper" and the vertical lower side is "lower" in a state where the luminaire is mounted on a horizontal ceiling, and the direction in which the luminaire body and the frame are lined up. (Axial direction of the accommodating part) is defined as "vertical direction". In addition, in this specification, the description of "abbreviated to" is intended to include a state of being completely parallel and a state of being substantially parallel, to explain by taking substantially parallel as an example.

The lighting fixtures according to this disclosure are mounted on horizontal ceilings in public facilities such as libraries and stations, commercial facilities such as department stores, stores, offices, residences, factories and other indoors, passageways, etc., but in the horizontal and vertical directions. On the other hand, it can be mounted on a sloping ceiling. The ceiling to which the lighting fixture is attached may be a portion that divides the upper part of the building space, and may be, for example, a ceiling such as an entrance porch or a terrace.

FIG. 1 is a perspective view of the entire lighting fixture 10 as an example of the embodiment as viewed from above. FIG. 2 is a perspective view of the entire lighting fixture 10 as viewed from below. FIG. 3 is a cross-sectional view taken along the line AA in FIG. FIG. 4 is a perspective view of the upper portion of the luminaire 10, and FIG. 5 is a perspective view of the lower portion of the luminaire 10. In FIGS. 1 to 4, the lead wire 17 is not shown. Hereinafter, for convenience of explanation, the first direction along the axial direction of the accommodating portion 20 is referred to as the “Z direction or the vertical direction”, and the second direction orthogonal to the first direction is referred to as the “XY plane direction”.

As shown in FIGS. 1 to 5, the lighting fixture 10 includes a light source 11, a fixture main body 12 having a topped cylinder-shaped accommodating portion 20 accommodating the light source 11, and a plate-shaped heat radiating fin 30, and accommodating portion 20. A frame body 13 fixed to a lower end portion (one end portion in the first direction) of the instrument main body 12 located on the opening side is provided. A plurality of heat radiation fins 30 are erected on at least the top portion 22 of the accommodating portion 20 and are formed along the vertical direction (Z direction) and the XY plane direction. At least a part of the plurality of heat radiating fins 30 extends in a predetermined direction, which is one of the XY plane directions, and projects outward from both ends in the predetermined direction of the accommodating portion 20.

In the lighting fixture 10, the lower end portion of the fixture body 12 is reduced in that direction at least on both sides in the predetermined direction, and at least a part of the gaps 36 of the adjacent heat radiation fins 30 are open at both ends in the vertical direction. By reducing the lower end of the instrument body 12 so that the heat radiating fins 30 project outward, a gap 36 of the heat radiating fins 30 having both ends open in the vertical direction is formed, and the space is perpendicular to the fins below the heat radiating fins 30. A space that communicates in various directions is formed. That is, since there are no obstacles above and below the heat radiating fin 30, air easily flows into the gap 36 of the heat radiating fin 30, convection occurs efficiently, and a high heat radiating effect can be obtained.

The luminaire 10 is inserted into an embedded hole formed in the ceiling and attached to the ceiling with the opening of the accommodating portion 20 facing vertically downward. The lighting fixture 10 is a ceiling-embedded fixture and is generally called a downlight. The method of attaching the luminaire 10 is not particularly limited, and one example is a method of using a hanging metal fitting installed in the space behind the ceiling into which the luminaire 10 is inserted. The hanging metal fitting is, for example, a rod-shaped metal fitting having a threaded tip portion, and is fixed to the frame body 13.

In the lighting fixture 10, the light of the light source 11 is emitted from the opening of the accommodating portion 20 formed at the lower end of the fixture main body 12. A reflector 27 (see FIG. 3 and FIG. 8 described later) is installed in the accommodating portion 20, and a part of the light of the light source 11 is reflected by the reflector 27 and emitted downward from the opening. The reflector 27 has a substantially perfect circular cross section perpendicular to the axial direction, and both ends (upper and lower ends) in the axial direction are open, and the reflector 27 has a divergent shape whose diameter increases as it approaches the lower end. A metal layer may be formed on the inner surface of the reflector 27 by vapor deposition, plating, sputtering or the like, or may be mirror-finished by polishing or the like. Alternatively, a white coating film containing a white pigment may be formed.

The luminaire 10 includes a tubular body 14 fixed to the frame body 13. The tubular body 14 is arranged in the frame body 13 so that the axial direction is along the vertical direction of the lighting fixture 10. Like the reflector 27, the tubular body 14 has a substantially perfect circular cross section perpendicular to the axial direction, and the diameter increases toward the lower end. The illumination light emitted from the opening of the accommodating portion 20 is introduced into the cylinder 14 from the upper end opening of the cylinder 14, and is emitted from the lower end opening of the cylinder 14. The tubular body 14 preferably functions as an auxiliary reflector. In this case, a reflective surface similar to that of the reflector 27 is formed on the inner surface of the tubular body 14.

The tubular body 14 is fixed to the frame body 13 by using a ring-shaped tubular body support member 48 and at least two engaging springs 49 fixed to the member. In the luminaire 10, the tubular body support member 48 engages with the peripheral edge of the upper end opening of the tubular body 14, and the engaging spring 49 is inserted into the through hole 45 formed in the upper frame 40 of the frame body 13. The tubular body 14 is fixed to the frame body 13. For the engaging spring 49, for example, a torsion spring is used.

It is preferable that the light source 11 is fixed to the top portion 22 in the accommodating portion 20 of the instrument main body 12. The light emitting element constituting the light source 11 is preferably a semiconductor light emitting element, and among them, an LED (Light Emitting Diode) is particularly preferable. The light emitting element may be sealed with a sealing layer containing a phosphor. In this case, the light source 11 emits white light by converting a part of the light of the light emitting element into light having a longer wavelength by the phosphor. A plurality of light sources 11 are mounted on, for example, a circuit board 18 to form a light emitting module 19.

The luminaire 10 includes a lead wire 17 (see FIG. 8) connected to the light source 11. In this embodiment, the lead wire 17 is connected to the light source 11 via the circuit board 18 of the light emitting module 19. The luminaire 10 generally includes a power supply device (not shown) that controls the electric power supplied to the light emitting module 19. The power supply device controls the supplied power based on, for example, an operation signal of a switch, a remote controller, or the like, or a detection signal of a motion sensor, an illuminance sensor, or the like. The lead wire 17 is pulled out from the accommodating portion 20 and connected to the power supply device.

It is preferable that the lighting fixture 10 further includes a translucent cover 15 that closes the opening of the accommodating portion 20 of the fixture body 12, and a support member 16 that is fixed to the fixture body 12 and supports the translucent cover 15. The translucent cover 15 has a substantially disk shape larger than the lower end opening of the reflector 27, and is arranged between the reflector 27 and the support member 16. The luminaire 10 is provided with a rubber member 28 having the same shape as the reflector 27, which is mounted on the outside of the reflector 27, and rubber is provided between the peripheral edge of the translucent cover 15 and the support member 16. A member 28 is interposed. The rubber member 28 is made of, for example, silicone rubber.

The translucent cover 15 is a transparent member such as a glass plate or a resin plate. The translucent cover 15 may be a milky white translucent member containing a filler or void for light diffusion, or may have a lens function of forming light on an incident surface and an emitted surface. good. The translucent cover 15 has a function of covering and protecting the light emitting module 19 housed in the accommodating portion 20 and transmitting or diffusing the light emitted from the light source 11 of the light emitting module 19.

As shown in FIGS. 3 and 4, the support member 16 is fixed to the accommodating portion 20 formed in the lower part of the instrument main body 12. The support member 16 is a ring-shaped member having a larger outer diameter and a slightly smaller inner diameter than the translucent cover 15. In the present embodiment, a flange 23 projecting outward is formed on the peripheral edge of the opening of the accommodating portion 20, and the support member 16 is screwed to the lower surface of the flange 23. By fixing the support member 16 to the accommodating portion 20, the translucent cover 15 and the like are supported, and the packing 50 that closes the slit 24 described later is supported.

As described above, the lighting fixture 10 has a structure in which the frame body 13 for holding the tubular body 14 is fixed to the lower end portion of the fixture main body 12 having the accommodating portion 20 and the plurality of heat radiation fins 30. In the lighting fixture 10, the frame body 13 is screwed to the lower surface of the flange 23 of the accommodating portion 20 via the support member 16. The lower portion of the instrument body 12 is smaller than the diameter of the frame body 13 and is connected to the frame body 13 in a state of being inserted into the frame body 13.

The accommodating portion 20 of the instrument main body 12 has a tubular wall 21 and a top portion 22, and has a shape in which the other end (upper end) in the axial direction is closed by the top portion 22. One end (lower end) in the axial direction of the accommodating portion 20 is opened as described above, and a flange 23 is formed on the peripheral edge of the opening. Further, a slit 24 for inserting a lead wire is formed in the cylinder wall 21. The luminaire 10 is attached to the cylinder wall 21 and includes a packing 50 that closes the slit 24 leaving a space for the lead wire 17 to pass through.

The accommodating portion 20 is formed in a substantially cylindrical shape, and has the maximum diameter at the lower end portion where the flange 23 is formed. That is, the tip (outer end) of the flange 23 is the outer end of the accommodating portion 20 in the XY plane direction. Most of the tip of the flange 23 is formed in an arc shape, but a part is formed in a straight line (see FIG. 4). This linearly formed portion is used for positioning when connecting the instrument main body 12 and the frame body 13.

In the present embodiment, the light emitting module 19 including the light source 11 is fixed to the top portion 22 in the accommodating portion 20. The top portion 22 is thickly formed at least in a part of the range in which the light emitting module 19 is fixed (see FIG. 3). In this case, the heat capacity of the top 22 can be increased. Since the upper fin 31 and the center fin 33, which will be described later, are connected to the thick portion, the heat generated by the light source 11 can be efficiently transferred to the fins.

At least one of the plurality of heat radiating fins 30 extends in a predetermined direction (hereinafter referred to as "X direction"), which is one of the XY plane directions, and projects outward from both ends of the accommodating portion 20 in the X direction. There is. The lower end of the instrument body 12 is reduced in that direction at least on both sides in the X direction. Further, at least a part of the gaps 36 of the adjacent heat radiation fins 30 are open at both ends in the vertical direction.

In this case, a space communicating in the direction orthogonal to the X direction (hereinafter referred to as the "Y direction") is formed below the portion of the heat radiation fin 30 protruding outward in the X direction. Therefore, air easily flows into the gap 36 of the heat radiating fin 30 from under the overhanging portion, and convection occurs efficiently to obtain excellent heat radiating characteristics.

It is preferable that the portion of the fixture body 12 located closer to the frame 13 than the light emitting module 19 including the light source 11 is reduced in that direction at least on both sides in the X direction. The instrument main body 12 has a plurality of upper fins 31 and a plurality of lower fins 32 as heat radiation fins 30. The upper fin 31 is formed at least above the light source 11 (the other end side in the first direction), and projects from the end of the accommodating portion 20 in the XY plane direction. The lower fin 32 is formed at least below the light source 11 (one end side in the first direction), and has a shorter length in the XY plane direction than the upper fin 31.

In the instrument body 12, each of the upper fin 31 and the lower fin 32 is formed along the X direction. Then, by making the length of the lower fin 32 in the X direction shorter than the length of the upper fin 31 in the X direction, the portion of the fixture body 12 located closer to the frame 13 than the light emitting module 19 is reduced in the X direction. ing. Further, each of the upper fins 31 is erected on the top portion 22 of the accommodating portion 20, and each of the lower fins 32 projects outward from the tubular wall 21 of the accommodating portion 20.

The appliance main body 12 has center fins 33 that are erected on the top portion 22 of the accommodating portion 20 and extend in the Y direction as heat radiation fins 30, and each of the upper fins 31 is connected by the center fins 33. preferable. In this case, a part of the heat generated by the light source 11 is diffused to the tip end side (X direction end side) of the upper fin 31 via the center fin 33. The upper fin 31 and the center fin 33 are connected to the thick portion of the top portion 22 as described above. By providing the center fin 33, the heat dissipation of the instrument main body 12 can be improved.

The heat radiation fins 30 may be formed along a plurality of directions in the XY plane direction. For example, a plurality of heat radiation fins 30 may be formed radially around the central axis of the accommodating portion 20. Also in this case, the heat radiation fins 30 project outward from at least both ends in the predetermined direction of the accommodating portion 20, and the lower end portions of the appliance main body 12 are reduced in the relevant direction at least on both sides in the predetermined direction.

The frame body 13 holds the tubular body 14 and is used when the lighting fixture 10 is attached to the ceiling. In the present embodiment, the upper frame 40 of the frame body 13 is formed with a through hole 46 through which the tip end portion of the hanging metal fitting can be inserted. For example, the frame body 13 can be fixed to the hanging metal fitting by attaching a nut to the tip of the hanging metal fitting inserted through the through hole 46. Further, in the frame body 13, the accommodating portion 20 and the tubular body 14 are arranged side by side in the vertical direction in a state where the accommodating portion 20 of the instrument main body 12 and the tubular body 14 are in the same axial direction. As a result, the reflector 27 arranged in the accommodating portion 20 and the tubular body 14 are connected to form a conduction path for the illumination light.

The frame body 13 is composed of an upper frame 40, a lower frame 41, and a connecting frame 42 that connects these two frames. The upper frame 40 and the lower frame 41 both have a substantially annular shape, and are formed in a size capable of accommodating the tubular body 14 inside the upper frame 40 and the lower frame 41. The lower frame 41 is located on substantially the same XY plane as the lower end portion of the tubular body 14, and supports the lower end portion of the tubular body 14 from the outside. A plurality of connecting frames 42 are provided, for example, at a substantially constant interval in the circumferential direction of the upper frame 40 and the lower frame 41. The vertical length of each connecting frame 42 is longer than the vertical length of the tubular body 14, and a distance capable of accommodating the tubular body 14 is secured between the upper frame 40 and the lower frame 41.

The upper frame 40 has a substantially annular base portion 43 having an inner diameter larger than that of the flange 23 of the accommodating portion 20, and a plurality of fixing pieces 44 fixed to the lower surface of the flange 23 via a support member 16. As shown in FIG. 5, the base portion 43 is formed with two through holes 45 into which the engaging spring 49 is inserted and two through holes 46 into which the tip end portion of the hanging metal fitting is inserted. The through holes 45 and 46 are preferably formed side by side in the radial direction of the base 43, respectively.

The upper frame 40 is formed with two fixing pieces 44 arranged in the radial direction of the base 43. Each of the fixing pieces 44 has a substantially L-shape extending from the base 43 toward the lower frame 41 and bent inward in the radial direction of the base 43 in the middle. The fixing piece 44 supports the instrument main body 12 from below, and is screwed to the flange 23 of the accommodating portion 20 via the support member 16. In the present embodiment, a ring-shaped cover 47 is provided between the fixed piece 44 and the tubular body 14. The ring-shaped cover 47 covers the lower surface of the flange 23 to which the support member 16 and the fixing piece 44 are screwed, and hides the screws and the like so that they cannot be seen from below. The ring-shaped cover 47 has a substantially annular shape and is fixed to the fixing piece 44 from below.

The frame body 13 is not limited to the one having the above-mentioned structure. For example, there may be three or more fixing pieces 44 and through holes 45 and 46. Further, the upper frame 40 and the lower frame 41 may be formed in a rectangular frame shape. The shapes of the upper frame 40 and the lower frame 41 can be changed according to the shape of the instrument main body 12 or the shape of the tubular body 14.

Hereinafter, the instrument main body 12 will be described in more detail with reference to FIGS. 6 to 8. FIG. 6 is a perspective view of the instrument body 12 as viewed from above, and FIG. 7 is a perspective view of the instrument body 12 as viewed from below. FIG. 8 is an exploded perspective view of the upper portion of the luminaire 10, showing a lead wire 17 drawn from the accommodating portion 20.

As shown in FIGS. 6 to 8, the instrument main body 12 includes a plurality of upper fins 31 extending in the vertical direction longer than the accommodating portion 20. The upper fin 31 projects in the X direction beyond the tip of the flange 23 of the accommodating portion 20. Further, a plurality of lower fins 32 that are shorter in the vertical direction and the X direction than the upper fins 31 are formed in the lower part of the instrument main body 12. The upper fins 31 and the lower fins 32 are preferably arranged side by side in the vertical direction. In this case, the lower end opening of the gap 36 of the adjacent upper fins 31 is widened so that air can easily flow into the gap 36, and the heat dissipation is further improved. The instrument body 12 can be molded by, for example, a die casting method.

The vertical length of the upper fin 31 is, for example, 1.5 to 5 times, preferably 2 to 4 times, the vertical length of the accommodating portion 20, and is 60% to 60% of the vertical length of the instrument body 12. It accounts for 85%. The lower fin 32 is preferably formed over substantially the entire length of the accommodating portion 20 in the vertical direction, and has, for example, substantially the same vertical length as the tubular wall 21. In the present embodiment, each lower fin 32 is formed with a length in the X direction so as not to project outward from the tip of the flange 23.

In the instrument body 12, the heat generated by the light source 11 is likely to be propagated to the upper fin 31 side. For example, most of the heat generated by the light source 11 is dissipated by the upper fins 31 that are formed large in the vertical direction and the X direction. However, by providing the lower fin 32 that projects from the cylinder wall 21 in the X direction, the heat dissipation of the appliance main body 12 is further improved. The plurality of lower fins 32 form a plurality of irregularities around the tubular wall 21 to increase the surface area and improve the heat dissipation of the portion close to the light source 11.

It is also possible to increase the thickness of the cylinder wall 21 so that there are no recesses without forming the lower fins 32 around the cylinder wall 21, but from the viewpoint of heat dissipation, light weight, etc., the lower portion It is preferable to form fins 32.

As described above, the instrument main body 12 preferably has a center fin 33 that stands upright on the top portion 22 of the accommodating portion 20 and connects each of the upper fins 31. The center fin 33 extends in the Y direction through the center of the top portion 22, for example, and is formed substantially perpendicular to each upper fin 31. Further, the center fin 33 projects in the Y direction from the end of the top portion 22. It is preferable that the center fins 33 project from both ends of the top portion 22 in the Y direction beyond the tips of the flanges 23 on both sides in the Y direction.

Further, the appliance main body 12 has auxiliary fins 34 extending from the overhanging portion (a portion protruding in the Y direction from the end of the top portion 22) of the center fin 33 to both sides in the X direction as the heat radiation fins 30. In the present embodiment, a total of six auxiliary fins 34 are formed, three at each end of the instrument main body 12 in the Y direction. Further, the instrument body 12 has a substantially T-shape or a substantially T-shape having a portion extending outward from the cylinder wall 21 along the center fin 33 (Y direction) and a portion extending from the tip portion to both sides in the X direction. A cross-shaped lower auxiliary fin 35 is formed.

Of the plurality of auxiliary fins 34, the two auxiliary fins 34a formed on the most central side in the Y direction at each of both ends of the center fin 33 in the Y direction are formed on the lower auxiliary fin 35. That is, the auxiliary fins 34a are arranged on the flange 23 via the lower auxiliary fins 35. On the other hand, the remaining four auxiliary fins 34b are formed outside the flange 23 in the Y direction. Of the two auxiliary fins 34a formed side by side in the X direction, one fin located on the through hole 46 side has a shorter length in the X direction than the other fin. As a result, it is possible to avoid interference between the auxiliary fin 34a and the hanging metal fitting inserted into the through hole 46 of the upper frame 40.

It is preferable that at least the lower end portion of the instrument main body 12 is reduced in the X direction and the Y direction. In the instrument body 12, the range in which the accommodating portion 20 is formed (for example, the range from the lower end of the instrument body 12 to 15% to 40% of the vertical length of the instrument body 12) is reduced in the X direction and the Y direction. .. In other words, the upper portion of the instrument body 12 on which the upper fin 31, the center fin 33, and the auxiliary fin 34 are formed projects in the XY plane direction. The diameter of the circumscribed circle at the lower end of the instrument body 12 (the circumscribed circle along the XY plane direction) is smaller than the diameter of the upper circumscribed circle of the instrument body 12 on which the upper fins 31 and the like are formed. It is about 1/3 to 2/3 of the diameter of.

Each of the upper fins 31 is formed substantially parallel to each other along the X direction at intervals in the Y direction in which the center fin 33 extends. The distance between the upper fins 31 may be the same, or may be gradually widened toward both ends in the Y direction of the instrument main body 12. That is, the widths (lengths in the Y direction) of the gaps 36 of the adjacent upper fins 31 may be the same, or may gradually widen as they approach both ends of the instrument body 12 in the Y direction. As described above, since the lower fins 32 are preferably formed side by side with the upper fins 31 in the vertical direction, the lower fins 32 are also formed substantially parallel to each other along the X direction.

Similar to the upper fins 31, the auxiliary fins 34 are also formed substantially parallel to each other along the X direction at intervals in the Y direction. Therefore, the upper fin 31 and the auxiliary fin 34 are arranged substantially in parallel. The gap 36 between the adjacent auxiliary fins 34 may be wider than the gap 36 between the adjacent upper fins 31, and may gradually widen as it approaches both ends in the Y direction. The gap 36 of the auxiliary fin 34 is open at both ends in the vertical direction, as in the case of the upper fin 31.

Each of the upper fin 31 and the auxiliary fin 34 extends from the center fin 33 to both sides in the X direction. Further, on both sides of the center fin 33, the two upper fins 31 and the two auxiliary fins 34 are formed on the same straight line along the X direction, respectively. In this case, the heat dissipation characteristics tend to be uniform on both sides of the center fin 33. However, the positions of the upper fin 31 and the auxiliary fin 34 may be displaced in the Y direction on both sides of the center fin 33. That is, each fin does not have to be formed on the same straight line along the X direction.

Each of the upper fin 31 and the auxiliary fin 34 may have substantially the same vertical length from each other, and the upper end of each fin may be located on substantially the same XY plane. On the other hand, it is preferable that the lengths of the upper fins 31 and the auxiliary fins 34 in the X direction are shorter for the auxiliary fins 34 and gradually become shorter as they approach both ends of the instrument body 12 in the Y direction. For example, the fins near both ends in the Y direction have a smaller temperature rise than the fins near the center in the Y direction, so even if the length in the X direction is shortened, heat dissipation is not impaired. Leads to a reduction in The vertical length of the fins may be gradually shortened as the device main body 12 approaches both ends in the Y direction.

It is preferable that at least one of the plurality of heat radiating fins 30 is formed thinner on the outer end side in the XY plane direction than the portion located on the central side of the accommodating portion 20. In particular, it is preferable that the thickness of the fin gradually decreases as it approaches the outer end in the XY plane direction. In the present embodiment, each of the upper fin 31 and the auxiliary fin 34 has a tapered shape, which is the thickest at the connection portion with the center fin 33 and gradually becomes thinner as it approaches the outer end in the X direction.

Since the temperature rise of the upper fin 31 and the auxiliary fin 34 is smaller toward the outer end, the heat dissipation is not impaired even if the thickness of the portion is reduced, which leads to weight reduction and material cost reduction. Similarly, the lower fin 32 may have a tapered shape that is thinned toward the outer end in the X direction. On the other hand, the center fin 33 is preferably formed to have a constant thickness so that heat can be easily transferred to the auxiliary fins 34 at both ends in the Y direction.

The lower end portions of the upper fin 31 and the auxiliary fin 34 may be formed to be thicker than the other portions. In this case, since the heat capacity of the lower end of each fin near the light source 11 is increased, heat can be quickly diffused to the outside of each fin in the X direction, for example. Further, since the instrument main body 12 is molded by the die casting method, the lower end portion thereof can be used as a contact portion of the extrusion pin when the molded product is extruded from the mold.

In the present embodiment, the gap 36 of the heat radiation fins 30 having both ends open in the vertical direction is between adjacent upper fins 31, between adjacent upper fins 31 and auxiliary fins 34, and between adjacent auxiliary fins 34. It is formed in each. The upper fins 31 project on both sides in the X direction, the auxiliary fins 34 project on both sides in the Y direction, and the lower portion of the instrument body 12 is reduced in the XY direction to create a gap 36 between the fins with both ends open in the vertical direction. It is formed.

Further, in the instrument main body 12, a space is formed below the portions of the upper fin 31 and the auxiliary fin 34 protruding in the XY plane direction. Further, this space is formed around the accommodating portion 20 and communicates with the gap 36 between the upper fin 31 and the auxiliary fin 34. In the instrument main body 12, there are no obstacles above and below the upper fin 31 and the auxiliary fin 34, and a space is formed around the accommodating portion 20, so that air easily flows into the gap 36 of each fin. Therefore, convection occurs efficiently in the upper part of the instrument main body 12, and good heat dissipation can be obtained. Since the lower end side of the gap between the lower fins 32 is closed by the flange 23, the structure is such that convection is less likely to occur as compared with the upper fins 31 and the like.

As shown in FIG. 8, a fin slit 37, which is a notch for locking a lead wire, may be formed in the lower portion of at least one upper fin 31 from the outer end in the XY plane direction along the direction. In the instrument main body 12, a slit 24 for pulling out the lead wire 17 from the accommodating portion 20 is formed between the two upper fins 31, and a fin slit 37 is formed in one of the two upper fins 31. There is.

The fin slit 37 is formed in the lower part of the upper fin 31, for example, along the X direction from the tip of the fin. The fin slit 37 may be formed over the entire length of the upper fin 31 in the X direction or over the entire length of the portion protruding from the end of the top portion 22. The fin slit 37 is formed in the lower part of the upper fin 31 leaving, for example, a thick lower end portion. In this case, the lead wire 17 drawn from the accommodating portion 20 is inserted into the fin slit 37 and wound around the lower end portion of the upper fin 31.

Further, on the other side of the two upper fins 31, a through hole 38 through which the binding band 39 can be inserted may be formed at the tip of the fin. The through hole 38 is formed at a position facing the fin slit 37 in the Y direction, for example. In the example shown in FIG. 8, the lead wire 17 is passed under the upper fin 31 in which the through hole 38 is formed, and the lead wire 17 is fixed to the fin by a binding band 39 inserted through the through hole 38. Since the space exists below the upper fin 31, such a lead wire 17 can be fixed in the vicinity of the accommodating portion 20.

Hereinafter, in addition to FIGS. 6 to 8, FIGS. 9 and 10 will be referred to as appropriate. FIG. 9 is an enlarged view of a portion of the instrument body 12 where the slit 24 is formed and its vicinity, and FIG. 10 is a perspective view of the packing 50 that closes the slit 24.

As shown in FIGS. 6 to 9, the accommodating portion 20 has a slit 24 for inserting a lead wire that penetrates the cylinder wall 21 and extends from the lower end of the accommodating portion 20 toward the top 22 side, and a slit that is connected to the slit 24. It has accommodation grooves 25 for packing 50 formed on both sides of the 24. The packing 50 is inserted into each accommodating groove 25 and comes into contact with the lead wire 17, and closes the slit 24 leaving a space for the lead wire 17 to pass through. The lead wire 17 can be pulled out from the inside of the accommodating portion 20 by the slit 24, and the gap of the cylinder wall 21 can be closed by the packing 50 to prevent insects and the like from invading the accommodating portion 20. Further, the packing 50 functions as, for example, a tension stopper member for the lead wire 17.

The slit 24 is formed in the cylinder wall 21 of the accommodating portion 20 between two upper fins 31 and lower fins 32 adjacent to each other in the Y direction, for example. In the lighting fixture 10, since the light emitting module 19 is fixed to the inner surface of the top portion 22, the slit 24 is preferably formed over the entire length of the tubular wall 21 in the vertical direction, that is, from the lower end of the accommodating portion 20 to the top portion 22. In this case, the lead wire 17 can be easily arranged in the accommodating portion 20. The width of the slit 24 is slightly larger than the diameter of the lead wire 17, for example.

The slit 24 and the accommodating groove 25 are open on the lower surface of the flange 23. Therefore, the packing 50 can be inserted into the slit 24 and the accommodating groove 25 through the opening. Of the edges of the slit 24, the edge located on the top 22 side, that is, the upper edge of the slit 24, has a recess 26 (recess on the main body side) in which the surface of the edge is recessed along the surface of the lead wire 17. ) Is preferably formed. By providing the recess 26, the upper edge portion of the slit 24 comes into contact with the surface of the lead wire 17, and it becomes difficult to form a large gap between the lead wire 17 and the cylinder wall 21. It is also possible to sandwich the lead wire 17 from above and below using two packings.

The accommodating grooves 25 are formed side by side with the slits 24 in the circumferential direction of the tubular wall 21 on both sides of the slits 24. Further, the accommodating groove 25 communicates with the slit 24 and is formed in the cylinder wall 21. The two accommodating grooves 25 formed on both sides of the slit 24 accommodate both ends of the packing 50 in the width direction, whereby the packing 50 is held in the cylinder wall 21. For example, the accommodating groove 25 may be formed in the thick portion of the tubular wall 21 formed on both sides of the slit 24, and the accommodating groove 25 may be formed by using the lower fins 32 formed on both sides of the slit 24. May be good. In the latter case, it can be said that the accommodating groove 25 is formed in the lower fin 32.

The accommodating groove 25 extends from the lower end of the accommodating portion 20 toward the top portion 22 side, similarly to the slit 24. The accommodating groove 25 may be shorter in the vertical direction than the slit 24, but in order to improve the adhesion to the lead wire 17, it is preferable that the accommodating groove 25 is formed to have substantially the same vertical length as the slit 24. The depth of each accommodating groove 25 (the length along the circumferential direction of the cylinder wall 21) may be substantially the same as the width of the slit 24, or may be 10% to 40% of the width of the packing 50. .. It can be said that the accommodating groove 25 is a recess formed by recessing the side wall of the slit 24 in the circumferential direction of the cylinder wall 21.

The accommodating groove 25 may be reduced in at least one of the circumferential direction and the thickness direction of the tubular wall 21 as it approaches the top portion 22 of the accommodating portion 20. Preferably, the closer to the top portion 22, the shorter the length of the accommodating groove 25 (depth, width of the accommodating groove 25) along the circumferential direction and the thickness direction of the tubular wall 21. The packing 50 has a shape corresponding to the shape of the accommodating groove 25. In this case, the packing 50 can be easily inserted into the accommodating groove 25 while ensuring good adhesion of the packing 50 to the cylinder wall 21.

As described above, the packing 50 is inserted into the slit 24 and the two accommodating grooves 25 formed on both sides thereof, whereby the slit 24 is closed leaving a space for the lead wire 17 to pass through. With the packing 50 inserted into the slit 24, the recess 26 formed on the upper edge of the slit 24 and the recess 56 described later of the packing 50 are lined up in the vertical direction to form a substantially perfect circular slit 24. A space (through hole) for passing through is formed.

In the present embodiment, the support member 16 is fixed to the lower surface of the flange 23 of the accommodating portion 20, and the packing 50 is supported by the support member 16. The packing 50 may be formed slightly longer in the vertical direction than the slit 24 and the accommodating groove 25, and the lower end portion of the packing 50 may slightly protrude from the openings of the slit 24 and the accommodating groove 25. In this case, the support member 16 compresses the packing 50 and strongly presses it against the edge of the slit 24, the wall surface of the accommodating groove 25, and the lead wire 17. Therefore, good adhesion between the packing 50 and these can be obtained.

As shown in FIG. 9, it is preferable that the lead wire 17 is provided with a stopper 60 that abuts on the inner surface of the cylinder wall 21 at the edge of the slit 24. The stopper 60 functions as a tension stopper member for the lead wire 17. For example, when the lead wire 17 is pulled, the stopper 60 is caught on the inner surface of the cylinder wall 21, so that the force acts on the inner surface, and the load applied to the connection portion between the lead wire 17 and the light emitting module 19 can be reduced. .. The packing 50 pressed against the lead wire 17 also contributes to stopping the tension of the lead wire 17, but by providing the stopper 60, it is possible to stop the tension more reliably.

A plurality of lead wires 17 may be provided, such as the lead wires 17a, 17b, and 17c. In this case, a binding band that binds a plurality of lead wires 17 may be used as the stopper 60. The lead wire 17 is a portion to which a binding band is attached, and the diameter of the lead wire 17 including the band is larger than the width of the slit 24. The binding band bundles a plurality of lead wires 17 and abuts on the inner surface of the cylinder wall 21 to function as a tension retaining member for the lead wires 17. Even when a plurality of lead wires 17 do not exist, the binding band may be used as the stopper 60.

As shown in FIG. 10, the packing 50 is preferably a flat block-shaped member, and is preferably made of a rubber member that is elastically deformed by being pressed by the support member 16. For example, a black packing 50 is used so that light does not leak through the packing 50. The packing 50 illustrated in FIG. 10 has a dimension of thickness <width <height, and the slit 24 is formed so that the thickness direction is along the thickness direction of the cylinder wall 21 and the height direction is along the vertical direction of the cylinder wall 21. And it is inserted into the accommodating groove 25.

The packing 50 may have a tapered shape in which at least one of the width and the thickness is reduced toward the upper end side arranged on the top 22 side of the accommodating portion 20. In the instrument main body 12, the length of the accommodating groove 25 along the circumferential direction and the thickness direction of the cylinder wall 21 gradually decreases as it approaches the top portion 22, so that the packing 50 is adjusted to the shape of the accommodating groove 25. The width and thickness gradually decrease toward the upper end. In this case, good adhesion between the packing 50 and the side wall of the accommodating groove 25 can be ensured, and the packing 50 can be easily inserted into the accommodating groove 25.

The packing 50 may have first convex portions 51 formed on each side surface along the thickness direction. In the example shown in FIG. 10, the first convex portion 51 is formed in a straight line over the entire length of each side surface in the vertical direction. The first convex portion 51 projects on both sides of the tubular wall 21 in the circumferential direction and abuts on the wall surface of each accommodating groove 25. By providing the first convex portions 51 on both side surfaces of the packing 50 in the width direction, good adhesion between the side surface of the packing 50 and the accommodating groove 25 can be ensured, and the packing 50 can be easily inserted into the accommodating groove 25. Further, a second convex portion 52 protruding from the central portion in the width direction to both sides in the thickness direction may be formed at the lower end portion of the packing 50. The second convex portion 52 is arranged in the slit 24 to improve the mounting stability of the packing 50.

A recess 56 (packing-side recess) is formed in the upper end of the packing 50, which is arranged on the top 22 side, so that the surface of the upper end is recessed along the surface of the lead wire 17. preferable. The recess 56 is formed in the central portion in the width direction at the upper end portion of the packing 50. By providing the recess 56, the upper end portion of the packing 50 comes into contact with the surface of the lead wire 17, and it becomes difficult to form a large gap between the lead wire 17 and the packing 50. As described above, the recess 56 is formed at a position aligned vertically with the recess 26 of the instrument main body 12, and together with the recess 26, forms a through hole through which a substantially perfect circular slit 24 passes.

As described above, in the lighting fixture 10, the upper fin 31 and the auxiliary fin 34 project outward, and the lower portion of the fixture body 12 has a shape reduced in the XY direction, so that the gap 36 between the fins opened at both ends in the vertical direction is created. It is formed and a space is formed around the lower part of the instrument body 12. Therefore, air easily flows into the gap 36 between the upper fin 31 and the auxiliary fin 34, and convection occurs efficiently in the upper part of the instrument main body 12. Therefore, according to the lighting fixture 10, good heat dissipation can be obtained and the temperature rise of the fixture can be suppressed.

Further, the slit 24 for inserting the lead wire and the accommodating groove 25 of the packing 50 are formed in the cylinder wall 21 of the accommodating portion 20, and the packing 50 is inserted into the slit 24 and the accommodating groove 25 to be brought into close contact with the lead wire 17. Then, the gap through which insects and the like can enter is closed in the accommodating portion 20. Such a seal structure is easy to assemble and has excellent airtightness. Further, by attaching the stopper 60 to the lead wire 17, it is possible to sufficiently stop the tension of the lead wire 17 while being simple. Therefore, it is not necessary to provide a tension stop structure for routing the lead wire 17 in the accommodating portion 20, and it is possible to reduce the size of the instrument main body 12. By fixing the lead wire 17 using the fin slit 37, the load applied to the connection portion between the lead wire 17 and the light emitting module 19 can be reduced.

10 Lighting equipment, 11 light source, 12 equipment body, 13 frame body, 14 cylinder body, 15 translucent cover, 16 support member, 17,17a, 17b, 17c lead wire, 18 circuit board, 19 light emitting module, 20 housing , 21 Cylinder wall, 22 Top, 23 Flange, 24 Slit, 25 Storage groove, 26, 56 Recess, 27 Reflector, 28 Rubber member, 30 Heat dissipation fin, 31 Upper fin, 32 Lower fin, 33 Center fin, 34, 34a, 34b Auxiliary fins, 35 Lower auxiliary fins, 36 gaps, 37 fin slits, 38, 45, 46 through holes, 39 binding bands, 40 upper frames, 41 lower frames, 42 connecting frames, 43 bases, 44 fixing pieces, 47 Ring-shaped cover, 48 cylinder support member, 49 engaging spring, 50 packing, 51 first convex part, 52 second convex part, 60 stopper

Claims (9)

Light source and
A top-mounted cylinder-shaped accommodating portion for accommodating the light source, and at least the top portion of the accommodating portion, along a first direction along the axial direction of the accommodating portion and a second direction orthogonal to the axial direction. An instrument body having a plurality of formed plate-shaped heat radiation fins, and
A frame body fixed to one end in the first direction of the instrument body located on the opening side of the accommodating portion, and
With
The heat radiation fin has
A plurality of upper fins erected on the top of the accommodating portion and projecting from the end of the accommodating portion in the second direction, and
A plurality of the upper fins are connected, erected on the top portion, extend in a direction orthogonal to a predetermined direction which is one of the second directions, and a center fin protruding from the end of the accommodating portion. ,
A plurality of auxiliary fins extending from the overhanging portion of the center fin to both sides in the predetermined direction,
Is included,
A lighting fixture in which both ends in the first direction are open in the gaps between the adjacent upper fins and the adjacent auxiliary fins. The lighting fixture according to claim 1, wherein a portion of the fixture body located on the one end side in the first direction with respect to the light source is reduced in that direction at least on both sides of the predetermined direction. The front Symbol heat radiating fins,
Even without least formed in the first direction end portion side of the light source, the length of the second direction includes a short plurality of lower fins than the upper fin, the lighting device according to claim 2. The light source is fixed to the top portion in the housing portion and is fixed to the top portion.
The luminaire according to claim 3, wherein each of the upper fins is erected on the top portion, and each of the lower fins projects outward from the tubular wall of the accommodating portion. Further provided with a lead wire connected to the light source
The luminaire according to claim 3 or 4, wherein a notch for locking the lead wire is formed in the lower portion of at least one upper fin from the outer end in the second direction along the direction. The luminaire according to any one of claims 3 to 5, wherein each of the upper fin and the lower fin is formed along the predetermined direction. Any one of claims 1 to 6, wherein the diameter of the circumscribed circle at the lower end of the instrument body is 1/3 to 2/3 of the diameter of the circumscribed circle at the upper part of the instrument body on which the upper fin is formed. Lighting equipment described in. The luminaire according to any one of claims 1 to 7 , wherein the upper fin and the lower end portion of the auxiliary fin are formed to be thicker than the other portion of the fin. 10. The listed luminaire.

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