JP2014071981A - Lighting device and lighting system using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lighting device etc. which extends fan's life.SOLUTION: A lighting device has a structure formed by attaching an axial flow fan 29 for facilitating heat radiation of a heat radiation part to a device body, which has the heat radiation part for radiating heat emitted from a light source during lighting, through an attachment member 141. The axial flow fan 29 has a frame placed on the attachment member 141 and a base (a holding part) 115 holding a bearing 123 and located at the rotation center. The base 115 contacts with the attachment member 141.

Description

  The present invention relates to a lighting apparatus and a lighting device that include a heat radiating part that radiates heat from a light source that is lit and an axial fan that promotes heat release from the heat radiating part.

A lighting fixture that uses an LED, which is one of semiconductor light emitting elements, as a light source has been proposed. In addition, although LED has the characteristic excellent in the point of efficiency and lifetime compared with an incandescent lamp, the said characteristic will worsen when temperature rises self-heating at the time of light emission.
In recent years, lighting fixtures that respond to demands for higher output have been studied that include fins (heat dissipating parts) for releasing the heat of LEDs during lighting and axial fans that allow the air around the fins to flow. (For example, Patent Document 1).

The lighting fixture described in Patent Document 1 is a so-called downlight type, and includes a fixture body, a light emitting module, and an axial fan. The instrument body is mounted on a ceiling or the like, and has a mounting portion for mounting a light emitting module including LEDs on the front side, and has a fin portion in which a plurality of fins are formed on the back side. An axial fan is attached to the fin portion.
The heat generated from the light emitting module (LED) at the time of lighting is conducted to the fin portion through the mounting portion and is released from the fin portion to the surrounding air. At this time, the air around the fin portion flows due to the rotation of the blades of the axial fan, and heat exchange between the fin and the ambient air is promoted.

Utility Model Registration No. 3163266

In the lighting fixture of the said structure, there exists a subject that a lifetime will become short.
The blades of the axial fan rotate constantly to suppress the temperature rise of the LED while the LED is emitting light. For this reason, the temperature between the rotating shaft of the axial fan and the bearing becomes higher due to these frictions. As a result, the wear of the bearing becomes severe, and long-term use becomes difficult.

Such a problem is not limited to the downlight type lighting fixture and the lighting device, but may be generated if the lighting fixture and the lighting device have an axial fan.
This invention is made | formed in view of the said subject, and it aims at providing the lighting fixture and the illuminating device which can lengthen the lifetime of an axial flow fan.

  In order to solve the above-described problem, the lighting apparatus according to one aspect of the present invention is an axial fan that promotes heat release of the heat dissipating part with respect to the apparatus main body having a heat dissipating part that releases heat generated from the light source during lighting. However, in the lighting fixture that is mounted via a mounting member, the axial fan has a frame mounted on the mounting member and a holding portion that holds a bearing on the center of rotation. The holding portion is in contact with the mounting member.

  In order to solve the above problems, a lighting device according to one embodiment of the present invention includes a lighting device including a light source and a power supply unit that turns on the light source, and the lighting device has the above-described configuration. It is characterized by being.

  Since the holding | maintenance part is contacting the mounting member, the lighting fixture and lighting apparatus of this invention which have the said structure can suppress the temperature rise of the holding | maintenance part holding the bearing of an axial fan. Thereby, the life of the axial fan can be extended.

It is a perspective view of the illuminating device which concerns on embodiment. It is the perspective view which looked at the lighting fixture from the light emission part side. It is sectional drawing of a lighting fixture. It is a disassembled perspective view of a lighting fixture. It is an expanded sectional view around the rotating shaft of an axial fan. It is sectional drawing of the lighting fixture which concerns on the modification 1. FIG. It is explanatory drawing of the axial fan which concerns on the modification 2, (a) is the figure seen from upper direction, (b) is the figure seen from the downward direction. It is sectional drawing of the axial fan which concerns on the modification 3. It is sectional drawing of the axial fan which concerns on the modification 4. It is the schematic of the lighting fixture which concerns on the modification 5. It is a planar view of the fin which concerns on a modification, (a) is a fin which concerns on the modification 6, (b) is a fin which concerns on the modification 7. FIG. It is sectional drawing of the illuminating device which has the fin which concerns on the modification 8. It is a top view of the damping member concerning modifications 9-11. (A) is a damping member according to Modification 9, (b) is a damping member according to Modification 10, and (c) is a damping member according to Modification 11.

<Outline of One Embodiment of the Present Invention>
In the lighting fixture according to one aspect of the present invention, an axial fan that promotes heat release of the heat radiating portion is provided via a mounting member with respect to a fixture main body having a heat radiating portion that emits heat generated from a light source during lighting. The axial flow fan has a frame mounted on the mounting member and a holding portion for holding a bearing on the rotation center, and the holding portion is the mounting member. In contact with.

In addition, a damping member having higher vibration absorption than the mounting member is interposed between the mounting member and the heat radiating portion, and the mounting member is in contact with the damping member. Thereby, even if the vibration of the bearing of the axial fan increases, the generation of noise due to the vibration can be suppressed.
Further, the mounting member is plate-shaped and has a vent hole for the axial fan, and a portion of the mounting member that contacts the holding portion is the vent hole when the mounting member is viewed in plan view. It is constructed from the outer part of the air vent and is located in the vent hole. Thereby, it is possible to reduce the obstruction of the air flow generated by the axial fan.

The mounting member is plate-shaped and has a plurality of vent holes for the axial fan, and the plurality of vent holes are portions that come into contact with the holding portion when the mounting member is viewed in plan view. Go. Thereby, it is possible to reduce the obstruction of the air flow generated by the axial fan.
Furthermore, the projected area of the mounting member is larger than the projected area of the axial fan. Thereby, the amount of heat conduction from the holding part to the mounting member can be increased.

The vibration damping member is plate-shaped, and the outer peripheral shape of the vibration damping member is substantially the same as the outer peripheral shape of the mounting member. Thereby, it can suppress that the vibration of an axial flow fan is transmitted from a mounting member to an instrument main body.
Furthermore, the thermal conductivity of the damping member is lower than the thermal conductivity of the mounting member. Thereby, it can suppress that the heat | fever of a holding | maintenance part is transmitted to the instrument main body side, or can suppress that the heat | fever of an instrument main body is transmitted to the attachment member side.

Moreover, the said mounting member contacts the said holding | maintenance part via a thermal radiation sheet or thermal radiation grease. Thereby, the amount of heat conduction from the holding part to the mounting member can be increased.
In a lighting device including a lighting fixture having a light source and a power supply unit that turns on the light source, the lighting fixture is the lighting fixture having the above configuration. Thereby, the same effect as the effect obtained with the said lighting fixture is acquired also in an illuminating device.

<Embodiment>
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1. Overall Configuration FIG. 1 is a perspective view of a lighting device 1 according to an embodiment.
The lighting device 1 includes a power supply unit 3 and a lighting fixture 5. The power supply unit 3 is electrically connected to a commercial power supply via a wiring cable 7. The power supply unit 3 and the lighting fixture 5 are electrically connected via a wiring cable 9.

The power supply unit 3 converts the received commercial power into power for causing the light emitting unit 15 of the lighting fixture 5 to emit light. The lighting fixture 5 receives the power converted by the power supply unit 3 and the light emitting unit 15 emits light. Here, the light emission part 15 is comprised by LED which is a semiconductor light emitting element, and the power supply unit 3 converts into direct-current power.
2. Each unit (1) Power supply unit The power supply unit 3 is disposed behind the ceiling because the lighting device 1 is a downlight. The power supply unit 3 includes a housing 11 and a circuit unit. The housing 11 has a function of accommodating a circuit unit therein. For this reason, the circuit part is accommodated in the housing | casing 11, and does not appear in FIG.

The casing 11 has a box shape, specifically, a rectangular parallelepiped shape.
The circuit unit includes, for example, a rectifier circuit that rectifies received commercial power (AC power) into DC power, a conversion circuit that converts the rectified power into power for causing the light emitting unit 15 to emit light, and the like.
Specifically, the circuit unit includes a circuit board and a plurality of electronic components mounted on the circuit board. In the housing 11, the circuit board is fixed by, for example, a screw member.
(2) Lighting fixture FIG. 2: is the perspective view which looked at the lighting fixture 5 from the light emission part 15 side, FIG. 3 is sectional drawing of the lighting fixture 5. As shown in FIG. FIG. 4 is an exploded perspective view of the lighting fixture 5.

The lighting fixture 5 includes a light emitting unit 15, a reflecting unit 17, and a heat emitting unit 19.
The light emitting unit 15 is composed of a plurality of LEDs and has a function as a light source of the illumination device 1. The reflection unit 17 has a function of reflecting light emitted from the light emitting unit 15 in a desired direction. The heat release unit 19 has a function of releasing heat generated when the light emitting unit 15 emits light.
As shown in FIG. 3, the lighting fixture 5 includes a fixture main body 23 having a plurality of heat radiating fins (hereinafter simply referred to as “fins”) 21, a light emitting means 25 attached to the fixture main body 23, and a fixture main body 23. And the axial flow fan 29 attached to the instrument main body 23.

Here, the light emitting unit 15 is mainly composed of the light emitting means 25. The reflecting portion 17 is mainly constituted by the reflecting means 27, and the heat emitting portion 19 is constituted by the fins 21 of the instrument main body 23 and the axial fan 29.
Hereinafter, each part will be described.
(2-1) Instrument Main Body The instrument main body 23 has a mounting part 35 for mounting the light emitting means 25 and a fin part 37 composed of a plurality of fins 21. The fin portion corresponds to the “heat radiating portion” of the present invention.

The instrument body 23 has a substantially lower half-like shape, and this portion is a mounting portion 35. The plurality of fins 21 are provided outside the bottom 35 a of the bowl-shaped mounting portion 35. Here, the side with the opening of the heel portion is the front side, and the side opposite to the opening of the heel portion (or the side with the fins 21) is the back side.
The light emitting means 25 is mounted on the inner side of the mounting portion 35, more specifically, on the bottom 35a thereof, and the surface of the bottom 35a becomes the mounting area 35b. A plurality of fins 21 extend from the back surface of the bottom 35a to the back side (upward in FIG. 3). Thereby, the heat at the time of lighting is thermally conducted from the mounting portion to the heat radiating portion.

The shape of one fin 21 is rectangular as seen from the back side as shown in FIG. Here, the direction in which the rectangular short side extends is referred to as a lateral direction or a short direction, and the direction in which the long side extends is referred to as a vertical direction or a longitudinal direction.
Here, there are 20 fins 21. The 20 fins 21 are provided in two rows except for both ends in the short direction. As shown in FIG. 4, the height of the plurality of fins 21a in the central portion in the short direction is lower than the height of the fins 21b on both sides thereof.

The fins 21b located at both ends in the short direction are provided with a part of the structure for mounting the axial fan 29. As a mounting method, for example, screwing means is employed, and a part of the configuration is a screw hole 21c.
(2-2) Light Emitting Unit The light emitting unit 25 includes a plurality of LEDs. As shown in FIG. 3, the plurality of LEDs are mounted on the instrument main body 23 as a module 45 mounted on the mounting substrate 43. That is, the module 45 includes a mounting substrate 43, a plurality of LEDs (not shown) mounted on the mounting substrate 43, and a sealing member 47 that covers the plurality of LEDs and seals the LEDs.

A through hole 43 a is formed in the central portion of the mounting substrate 43, and the wiring 92 of the wiring cable 9 that passes through the through hole 43 a from the back side to the front side is connected to the wiring pattern formed on the mounting substrate 43. ing. The connection is made by solder.
In the present embodiment, for example, as shown in FIG. 2, the plurality of LEDs are divided into six groups, and each group corresponds to the position of a hexagonal corner, so that the disk-shaped mounting substrate 43 is formed. It is arranged. Here, the sealing member 47 covers all the LEDs constituting each group together (that is, in units of groups). A sealing member 47 appears in FIG.

  In the present embodiment, the light emitting means 25 includes a reflection plate 51 in addition to the module 45 as shown in FIG. The reflecting plate 51 is for reflecting the light emitted from the LED to the front side. Specifically, the reflecting plate 51 has a recess 53 that is recessed in a bowl shape corresponding to each group of LEDs. The concave portion 53 has an opening 53 a at the concave insertion tip, and the circumferential surface is a reflective surface 63. The LED (sealing member 47) is positioned in the opening 53b of the recess 53.

In the present embodiment, the light emitting means 25 has a front panel 55. The front panel 55 mainly has a function of protecting the module 45 and the reflection plate 51. The front panel 55 is made of a light transmissive material (for example, a resin material).
Members constituting the light emitting means 25, here, the module 45, the reflecting plate 51, and the front panel 55 are fixed to the instrument main body 23. As a fixing method, for example, engagement means is adopted.

That is, the convex part 57 provided in the reflecting plate 51 engages with the groove 56 formed in the instrument main body 23. Further, the peripheral edge of an annular pressing plate 59 that presses the front panel 55 toward the module 45 is engaged with the groove 58 formed in the instrument main body 23.
(2-3) Reflecting means The reflecting means 27 has a reflecting surface 63. The reflection means 27 includes a cylindrical body 65 and a reflection plate 67.

  The inner peripheral surface of the cylindrical body 65 has a bowl shape whose inner peripheral diameter decreases as it moves from the front surface to the rear surface of the lighting fixture. A reflecting plate 67 corresponding to the shape of the inner peripheral surface is provided on the inner peripheral surface. The reflecting plate 67 has a reflecting surface 63 on the surface (inner peripheral surface) opposite to the surface facing the inner peripheral surface of the cylindrical body 65. The reflection surface 63 is obtained by forming a reflection film or mirror finishing, for example.

As a method for attaching the reflecting plate 67 to the cylindrical body 65, for example, an engaging means is employed. Specifically, the front-side end 67a and the rear-side end 67b of the reflecting plate 67 are engaged with each other by curving the front-side end 65a and the rear-side end 65b of the cylindrical body 65. Yes.
The cylindrical body 65 is attached to the front side of the instrument main body 23. For this reason, on the back surface side of the cylindrical body 65, a part of the configuration for mounting the cylindrical body 65 and the instrument main body 23 is provided. Here, a screwing means is employed as a mounting method, and is constituted by a screw member 69 (see FIG. 1), a through hole of the instrument main body 23, and a screw hole of the cylindrical body 65.

The cylindrical body 65 has a flange portion 93 that projects outward in the radial direction of the cylindrical body 65 at an end portion 65a on the front surface side. Thereby, when the lighting fixture 5 is mounted on the ceiling opening, the gap between the lighting fixture 5 and the ceiling opening is hidden.
The cylindrical body 65 has fixing means for fixing the lighting fixture 5 to the ceiling side when inserted into the opening of the ceiling. As the fixing means, a leaf spring 95 as shown in FIG. 2 is used. When the leaf spring 95 is inserted into the ceiling, the leaf spring 95 tends to spread outward and presses the peripheral surface of the opening of the ceiling by this restoring force.
(2-4) Axial Flow Fan The axial flow fan 29 is for accelerating the heat radiation from the fins 21. The axial fan 29 is mounted on the instrument main body 23 via the mounting member 141. The axial fan 29 causes the air near the fins 21 to flow by the rotation of the blades 103, and promotes heat exchange of the fins 21.

The axial fan 29 includes a frame 105 (see FIG. 3), a fixed portion 107, and a rotating portion 109 as a basic configuration. The plurality of blades 103 are provided in the rotating unit 109.
FIG. 5 is an enlarged sectional view around the rotating shaft of the axial fan 29.
As shown in FIGS. 3 and 5, the frame 105 supports the fixed portion 107, and the rotating portion 109 is rotatably supported with respect to the fixed portion 107, and rotates by being given a rotational force by the fixed portion 107. . The rotational force here uses a magnetic field and a Lorentz force of current.

The frame 105 has a cylindrical shape, and here, the cross-sectional shape is a square (square) shape. A blade 103 and the like are accommodated inside the frame 105. The frame 105 has an extending portion 113 extending from the inner peripheral surface toward the central axis.
Here, there are a plurality of (four) extending portions 113, which are end portions on the instrument body 23 side and extend from four corners (corners). The extended portion 113 is connected to the fixed portion 107 in the vicinity of the central axis (a region including the central axis). Thereby, the fixing portion 107 is supported by the extending portion 113.

The fixed portion 107 includes a flange-shaped base 115 and a coil 117 provided on the base 115. The base 115 includes a tube portion 115a and a flange portion 115b extending radially outward from an end portion of the tube portion 115a on the instrument body 23 side.
A plurality of coils 117 are provided on the cylindrical portion 115a of the base 115 at intervals in the circumferential direction. The flange portion 115 b is connected to the extending portion 113. Actually, the base 115, the extended portion, and the frame 105 are integrally formed.

The base 115 holds a bearing 123 that rotatably supports the rotating unit 109. Specifically, the base 115 holds the two bearings 123 on the inner peripheral side of the cylindrical portion 115a. The two bearings 123 are arranged at intervals in the extending direction of the rotation center. Here, a ball bearing is used as the bearing 123.
The central axis of the cylinder portion 115a of the base 115 and the rotation center of the rotating portion 109 coincide with each other. That is, the base 115 is located on the center of rotation.

The rotating unit 109 has a rotating shaft 119 disposed in the cylindrical portion 115 a of the base 115. The rotating shaft 119 is attached to the fixed portion 107 via a bearing 123. As a result, the rotating unit 109 is rotatably supported with respect to the fixed unit 107.
The rotating unit 109 includes a housing 125 that covers the coil 117 in a state of being spaced from the coil 117 of the fixed unit 107, and a plurality of blades 103.

  The housing 125 has a bottomed cylindrical shape, and a rotating shaft 119 is attached to the cylindrical portion. The rotating shaft 119 is mounted in a state where the central axis thereof coincides with the central axis of the housing 125. The housing 125 is provided with a permanent magnet 127 so as to face the coil on the fixed portion 107 side. A plurality of permanent magnets 127 are provided on the inner peripheral surface of the cylindrical portion 125 a of the housing 125 at intervals in the circumferential direction.

The permanent magnet 127 of the rotating unit 109 and the coil 117 of the fixed unit 107 constitute a so-called electric motor. That is, the permanent magnet 127 of the rotating unit 109 is attracted by the magnetic force generated by the coil 117 of the fixed unit 107, and the rotating unit 109 rotates.
As shown in FIGS. 1 and 4, the frame 105 has a flange portion 131 projecting outward on the outer peripheral surface thereof. The flange portions 131 are provided at positions facing each other with respect to the central axis of the frame 105. The flange portion 131 has a through-hole penetrating in the thickness direction (the axial direction of the frame 105).

A finger guard 133 is provided on the upper surface of the frame 105 (the end surface opposite to the instrument body 23), as shown in FIGS. The finger guard 133 is for preventing foreign matter from entering the frame 105 and interfering between the blade 103 and the foreign matter, or preventing a finger from entering the frame 105.
Here, the finger guard 133 extends in the radial direction, with a circular plate 135 disposed on the rotating shaft 119 of the axial fan 29, a plurality of circular rings 137 disposed on the outer peripheral side of the circular plate 135 and having different diameters. And a connecting line 139 for connecting the disc 135 and the annular ring 137.

The finger guard 133 is attached to the axial fan 29 by inserting the end of the connecting line 139 opposite to the disk 135 into the hole on the upper surface of the frame 105.
As shown in FIG. 4, the axial fan 29 is attached to the instrument body 23 by attaching the axial fan 29 to the attachment member 141 and attaching the attachment member 141 to the instrument body 23. A vibration damping member 143 is interposed between the mounting member 141 and the instrument main body 23.
(3) Mounting member and damping member The mounting member 141 is made of a material having higher thermal conductivity than the frame 105 of the axial fan 29. The damping member 143 is made of a material having higher vibration absorption than the mounting member 141.

Here, the mounting member 141 and the vibration damping member 143 have a flat plate shape. The projected areas of the mounting member 141 and the damping member 143 are larger than the projected area of the axial fan 29.
Here, the axial fan 29 is mounted on the mounting member 141 by a screwing method. Specifically, as shown in FIG. 1, a screw member 145 is used. The screw member 145 passes through the through hole of the flange portion 131 of the axial fan 29 and is screwed into the screw hole 141a (see FIG. 4) of the mounting member 141.

The through hole 143a (see FIG. 4) of the vibration damping member 143 accommodates the tip of the screw member 145 that is screwed into the screw hole 141a of the mounting member 141 when the tip of the screw member 145 protrudes from the mounting member 141. Is for.
A screwing method is employed here for mounting the mounting member 141 to the instrument body 23. Specifically, as shown in FIG. 1, a screw member 147 is used. The screw member 147 includes a through-hole 141b of the mounting member 141 and a through-hole 143b of the vibration suppression member 143 in a state in which the vibration suppression member 143 is sandwiched between the mounting member 141 and the instrument body 23. The screw 21 is screwed into the screw hole 21 c provided in the fin 21.

The mounting member 141 and the damping member 143 are configured to pass air that flows from the fin 21 side of the instrument body 23 to the axial fan 29 side or air that flows from the axial fan 29 side to the fin 21 side of the instrument body 23. It has pores 151 and 153. In addition, the code | symbol of the ventilation hole of the mounting member 141 is "151", and the code | symbol of the ventilation hole of the damping member 143 is "153".
The opening shape of the ventilation hole 151 of the mounting member 141 is the extension portion 113 and the fixed portion in the frame 105 when the axial flow fan 29 is viewed from the instrument body 23 side (so-called planar view). The region substantially matches the region other than the portion corresponding to 107.

That is, the ventilation hole 151 is formed in the mounting member 141 such that the contact portion 141c is positioned in the ventilation hole 151 when the mounting member 141 is viewed in plan. The contact portion 141c is a portion that contacts the base 115 of the axial fan 29 in the mounting member 141.
The vent hole 151 is a vent hole for the axial fan 29 and can be said to be composed of a plurality of through holes (the vent holes of the present invention). In this case, when the mounting member 141 is viewed in plan, a plurality of through holes are provided so as to surround the contact portion 141c.

The contact portion 141c is located substantially at the center of the vent hole 151 and has a circular shape in plan view. Here, the air vent 151 has a square shape, and the intersection of the diagonal lines substantially coincides with the rotation center of the axial fan 29 and the center of the circular contact portion.
As shown in FIG. 4, the contact portion 141c is constructed from the outer portion 141d of the vent hole 151 via the bridge portion 141e. The bridge portion 141e goes from the four corners of the vent hole 151 to the contact portion 141c. The bridge portion 141e overlaps with the extended portion 113 of the axial fan 29 in plan view.

Therefore, in a state where the axial fan 29 is mounted on the mounting member 141, the bridge portion 141 e contacts the extending portion 113 of the frame 105, and the contact portion 141 c contacts the flange portion 115 b of the base 115.
The vent hole 153 of the vibration damping member 143 is provided so as to coincide with a region corresponding to the frame 105 when the axial fan 29 is viewed from the instrument body 23 side. The vent hole 153 has a square shape in plan view.
3. About the heat dissipation of an axial fan The rotating part 109 provided with the blades 103 has a rotating shaft 119, and the rotating shaft 119 is rotatably attached to the fixed part 107 via a bearing 123. The rotating unit 109 rotates while the plurality of LEDs that are the light emitting means 25 emit light, that is, while the lighting device 1 is lit.

  As the rotating portion 109 rotates, the frictional heat generated in the bearing 123 is conducted to the mounting member 141 via the base 115 of the fixed portion 107. At this time, since the mounting member 141 is made of a metal material having high thermal conductivity, the frictional heat transmitted through the flange portion 115b of the base 115 passes through the bridge portion 141e from the contact portion 141c and the mounting member 141. Conduct to the whole. Thereby, the heat generated in the bearing 123 is less likely to be accumulated inside, and the temperature rise of the bearing 123 and the rotating shaft 119 can be suppressed.

As shown in FIGS. 1 and 4, the axial fan 29 is provided in the central portion of the mounting member 141. For this reason, the heat generated in the bearing 123 can be uniformly conducted radially from the contact portion 141c, which is the central portion of the mounting member 141, to the entire region, and the temperature rise between the rotating shaft 119 and the bearing 123 is efficiently performed. Can be suppressed.
Since the mounting member 141 has a vent hole 151 that matches the extended shape 113 of the frame 105 and the bottom shape of the fixing portion 107, the contact area with the fixing portion 107 is maximized, and the amount of heat received from the axial fan 29 is increased. be able to.

Further, when the damping member 143 has a plate shape and the outer shape is substantially the same as that of the mounting member 141, and the thermal conductivity of the damping member 143 is lower than the thermal conductivity of the mounting member 141, the damping member 143 is warmed around the radiating fin 21. It can suppress that the temperature of the mounting member 141 rises with the produced air. Thereby, the temperature rise of the rotating shaft 119 and the bearing 123 can be suppressed more efficiently.
Thus, in the illuminating device 1 according to the present embodiment, by releasing the heat of the axial fan 29 via the mounting member 141, the temperature rise between the rotating shaft 119 and the bearing 123 can be suppressed, and the axial fan 29 The lifetime can be extended.
4). End-of-life lighting device In the lighting device 1, the rotating portion 109 of the axial fan 29 rotates at a high speed. The rotating part 109 and the blades 103 are designed and manufactured so as not to cause excessive vibration during rotation. However, a slight deviation of the center of gravity generates minute vibrations and noise.

Further, when the lighting device 1 is used for a long period of time, in the axial fan 29, wear of the friction portion in the bearing 123 connected to the fixed portion 107 and the rotating portion 109 becomes intense, and the play becomes large. Due to the rattling, the vibration of the axial fan increases, or it resonates with the mounting member 141 and the instrument body 23 to generate abnormal noise and noise.
However, the lighting device 1 according to the embodiment includes the vibration damping member 143 between the mounting member 141 and the instrument main body 23. The vibration damping member 143 is a material having excellent vibration absorption characteristics, and absorbs vibrations of the axial fan 29 and the mounting member 141. Thereby, the noise by a vibration can be made small from the beginning, and the lifetime of the illuminating device 1 can be lengthened.
<Modification>
1. Type of Axial Fan (1) Bearing In the embodiment, a ball bearing has been described as an example of the bearing 123 of the rotating shaft 119, but other bearings may be used. As another bearing, for example, a sliding bearing such as a sintered oil-impregnated bearing or a fluid dynamic pressure bearing can be used.

  For example, in the case of a slide bearing, lubricating oil is interposed between the bearing and the rotating shaft, so that direct contact is avoided, but part of the rotational energy becomes heat and is generated from surrounding coils and the like. Heat increases the temperature of the bearing and the rotating shaft. When the temperature of the contact portion between the bearing and the rotating shaft rises, evaporation or deterioration of the lubricating oil that is an organic substance is caused. As a result, the bearing and the rotating shaft come into direct contact with each other, a frictional noise is generated, and finally smooth rotation cannot be performed.

Therefore, the frictional heat generated between the rotating shaft and the bearing is actively conducted to the mounting member to prevent the temperature of the contact portion from rising from the viewpoint of durability and quietness between the rotating shaft and the bearing. desirable.
(2) Position In the embodiment, the axial fan 29 is mounted on the upper surface of the fin 21 of the instrument body 23. That is, the axial fan 29 is provided so as to protrude upward from the instrument body 23.

However, the axial fan only has to flow air around the fins, and the mounting position of the axial fan is not particularly limited. Hereinafter, an example in which an axial fan is mounted in a manner different from the embodiment will be described as a first modification.
FIG. 6 is a cross-sectional view of a lighting fixture according to the first modification.
A lighting fixture 201 according to Modification 1 includes a fixture body 23, a light emitting means 25, a reflecting means 27, and an axial fan 205. Here, the instrument main body 23, the light emitting means 25, and the reflecting means 27 have the same configuration as the instrument main body 23, the light emitting means 25, and the reflecting means 27 in the embodiment, and the same reference numerals are used.

The upper part of the instrument body 23 is a fin portion 37 provided with a plurality of fins 21. The central portion of the fin portion 37 is recessed.
The axial fan 205 is mounted on the instrument main body 23 via the mounting member 209 and the vibration damping member 211. The axial fan 205 has the same configuration as that obtained by removing the finger guard 133 from the axial fan 29 of the embodiment.

The axial fan 205 is fixed to the mounting member 209 via, for example, a screw member 213. The mounting member 209 on which the axial fan 205 is mounted is fixed to the fins 21 with screw members 215 as shown in FIG. At this time, the axial fan 205 is fitted into a recessed portion formed by the fin 21 a having a short height at the center of the instrument body 23.
The damping member 211 is provided in a state of being interposed between the mounting member 209 and the instrument main body 23 as in the embodiment. Further, the vibration damping member 211 is approximately the same size as the fin portion 37 in plan view.

Also in the lighting fixture 201 according to the first modification, the central portion 209a of the mounting member 209 is in contact with the fixing portion 217 of the axial fan 205. That is, the mounting member 209 according to Modification 1 also has a contact portion (corresponding to the central portion 209a) that comes into contact with the fixing portion 217.
Here, the mounting member 209 and the vibration damping member 211 have a flat plate shape, and the mounting member 209 is larger in size in plan view than the vibration damping member 211.
(3) Frame In the embodiment, the frame 105 of the axial fan 29 has a square shape in plan view, but may have other shapes. Hereinafter, an example of an axial fan having a frame shape different from that of the embodiment will be described as a second modification.

FIGS. 7A and 7B are explanatory views of an axial fan according to the second modification, where FIG. 7A is a diagram viewed from above, and FIG. 7B is a diagram viewed from below.
An axial fan 251 according to Modification 2 includes a bottomed cylindrical frame 253 having a circular cross section. On the outer peripheral side of the frame 253, there is a flange portion 255 at a position opposite to the center axis, and a through hole 255a through which a screw member is inserted when the axial fan 251 is attached to the instrument body is formed in the flange portion 255. Yes.

Also in the second modification, a finger guard 257 is attached to the upper surface of the frame 253 as shown in FIG.
As shown in FIG. 7B, the bottom of the frame 253 has a base 261 that constitutes a fixed portion. The base 261 is supported by a plurality of extending portions 263 extending from the inner peripheral surface of the frame 253 toward the central axis.

In addition, although the cross-sectional shape of the frame 253 in the modified example 2 is a circular shape, other shapes may be used. Other shapes include an elliptical shape and a polygonal shape. However, considering the rotating blade trajectory and the size of the frame, the cross-sectional shape is preferably a regular polygonal shape such as a circular shape or a square shape.
(4) Structure of Axial Flow Fan In the axial flow fan 29 of the embodiment, the rotating unit 109 has a rotating shaft 119. The rotating shaft 119 has a solid cylindrical shape and is attached to the housing 125 of the rotating unit 109.

However, the axial fan may have a structure that does not have a rotating shaft that is a separate member from the housing. Hereinafter, an axial fan that does not have a rotating shaft as a separate member will be described as a third modification.
In the embodiment, a so-called outer rotor type axial fan in which the permanent magnet 127 of the rotating portion is located outside the coil 117 of the fixed portion 107 is described. However, the axial fan may be a so-called inner rotor type. Hereinafter, an inner rotor type axial fan will be described as a fourth modification.

FIG. 8 is a cross-sectional view of an axial fan according to the third modification.
An axial fan 271 according to Modification 3 includes a fixed portion 107 and a rotating portion 273. The rotating part 273 is rotatably supported by the fixed part 107 via a bearing 275.
The rotating unit 273 includes a bottomed cylindrical housing 277 and a permanent magnet 279 provided on the housing 277. The housing 277 has a cylindrical portion 277a extending cylindrically from the center of the bottom. The cylindrical portion 277a is fitted in the bearing 275 and functions as the rotation shaft 119 of the axial fan 29 in the embodiment.

FIG. 9 is a cross-sectional view of an axial fan according to the fourth modification.
An axial fan 281 according to Modification 4 includes a fixed part 283 and a rotating part 285. The rotating part 285 is rotatably supported by the fixed part 283 via a bearing 287.
The fixing portion 283 includes a housing 289 supported by an extending portion extending from the frame, and a coil 291 provided in the housing 289. The housing 289 has a bottomed cylindrical shape, and a coil 291 is mounted on the inner peripheral surface of the cylindrical portion 289a. The housing 289 has a cylindrical portion 289b extending in a cylindrical shape from the center of the bottom.

The cylindrical portion 289b is fitted in the bearing 287 and functions as a fixed shaft. The cylindrical portion 289b holds the bearing 287, and the housing 289 corresponds to the holding portion of the present invention.
The rotating unit 285 includes a base 293 and a permanent magnet 295 provided on the base 293. The base 293 has a cylindrical portion 293a extending cylindrically from the center. The permanent magnet 295 is provided on the outer periphery of the cylindrical portion 293a.
(5) Rotation direction of blades In the embodiment, the rotation direction of the blades 103 is not particularly described, but the rotation direction is not particularly limited. That is, the air may flow from the outside to the inside of the fin portion 37 or the air may flow from the inside to the outside of the fin portion 37 by rotating the blade 103. Either way, air flows around the fins 21 and heat exchange of the fins 21 is promoted.

However, the heat exchange characteristics are better when the wind is blown from the axial fan to the fins. Accordingly, the rotation direction of the blades is preferably a rotation direction that causes a wind to blow against the fins.
(6) Others In the embodiment, the extending portion 113 connected to the fixed portion 107 of the axial fan 29 is provided at the end of the frame 105 on the side close to the fin 21. The position of the extended portion with respect to the frame is not particularly limited.

  However, the position of the stretched portion is preferably on the positive pressure side when the blade is rotated. More specifically, in the embodiment, when the axial fan 29 rotates so as to send the wind blown against the fins 21, the pressure from the blades 103 to the fins 21 is positive. In the case of such rotation, as shown in the embodiment, the extending portion 113 is preferably located between the blade 103 and the fin 21.

This is because if there is an extended portion on the negative pressure side, a wind noise is generated during suction.
In the embodiment and the modification 1, the number of the axial flow fans 29 and 205 is one. However, the number of the axial flow fins is not limited to one, and for example, a plurality of axial flow fins may be provided. Further, the number of blades is not limited to four, but may be two, three, five or more, or may be a multistage axial fan.
2. Instrument Main Body In the embodiment, the plurality of fins 21 are provided as a part of the instrument main body 23, but a structure that is attached to an attachment member to which the light emitting means 25 is attached may be used. That is, the plurality of fins and the mounting member for the light emitting means 25 may be configured as separate members. In the case of such a lighting fixture, the mounting member on which the light emitting means 25 is mounted is the fixture main body.

As a configuration in which the plurality of fins and the mounting member are separate members, for example, a fin member integrally including a plate-like base and a plurality of fins extending from the base is used as the mounting member for the light emitting means 25. There is something to attach.
In the embodiment, the instrument main body 23 and the reflection means 27 are configured as separate members (separate members), and the reflection means 27 is attached to the instrument main body 23.

However, the instrument body and the reflecting means may be configured as one member (integral), or the member for mounting the light emitting means and the reflecting means are configured as one member and the fin member is mounted. May be.
3. Fins In the embodiment, the plurality of fins 21 extend in the thickness direction of the instrument body 23, and each fin 21 has a rectangular shape when viewed from the extending direction. That is, each fin 21 has a rectangular cross-sectional shape orthogonal to the thickness direction of the instrument body 23 and extends in the thickness direction.

However, the shape of the fin is not particularly limited as long as the heat at the time of light emission of the light emitting means can be released to the surrounding air by conduction, radiation, and convection.
Hereinafter, modified examples of the fin shape and structure will be described.
FIG. 10 is a schematic diagram of a lighting fixture according to Modification 5.
A lighting fixture 301 according to Modification 5 includes a fixture main body 303, a light emitting means 25, a reflecting means 27, and an axial fan 29. Here, the light emitting means 25 (not shown in the figure), the reflecting means 27, and the axial fan 29 have the same configuration as those in the embodiment, and the same reference numerals are used.

The upper part of the instrument body 303 is a fin portion 307 made up of a plurality of fins 305. The plurality of fins 305 extend in the thickness direction of the instrument body 303.
The plurality of fins 305 are all equal in height. This is different from the plurality of fins 21 in the embodiment.
The plurality of fins 305 are arranged in the same manner as the plurality of fins 21 of the embodiment. That is, the plurality of fins 305 have a rectangular cross-sectional shape and are arranged in a plurality of rows (here, two rows) in the longitudinal direction, and there are gaps between the rows. . Thereby, the air around the plurality of fins 305 can be caused to flow by the axial fan 29.

FIG. 11 is a plan view of a fin according to the modification, where (a) is a fin according to modification 6, and (b) is a fin according to modification 7.
The plurality of fins 351 according to the modification 6 extend in the thickness direction of the instrument main body 353 (the direction perpendicular to the paper surface in the drawing). Each of the plurality of fins 351 is provided in the circumferential direction at a predetermined interval around the central portion 355 of the instrument main body 353 except for the central portion 355 thereof. That is, the plurality of fins 351 are arranged radially in plan view.

The heights of the plurality of fins 351 are all the same here, but a height difference may be given in the radial direction, or fins having different heights in the circumferential direction may be alternately arranged. Further, fins having a low height may be provided radially in the central portion 355 of the instrument main body 353.
The plurality of fins 371 according to the modification 7 extend in the thickness direction of the instrument main body 373 (the direction perpendicular to the paper surface in the drawing). Each of the plurality of fins 371 has a circular cross section orthogonal to the thickness direction, and is provided concentrically.

Each fin 371 has a through hole 375 penetrating in the radial direction. As a result, air flow is generated by the axial fan around all the fins 371.
The heights of the plurality of fins 371 are all the same here, but need not be unified to all the same.

FIG. 12 is a cross-sectional view of an illumination device 401 having fins according to Modification 8.
The plurality of fins 403 according to the modification 8 extend in a direction perpendicular to the thickness direction of the instrument body 405 (the left-right direction in the figure). Each of the plurality of fins 403 is formed in a flat plate shape in the direction orthogonal to the circumference except for the central portion 407 of the instrument main body 405, and is provided at a predetermined interval in the thickness direction of the instrument main body 405.

That is, the fin portion 409 including the plurality of fins 403 includes a cylindrical region 411 extending in the thickness direction, and a plurality of fins 403 extending in a plate shape from the outer periphery of the cylindrical region 411 in a direction orthogonal to the central axis of the cylindrical region 411. It has.
The cylinder region 411 has a through hole 413 that penetrates the cylinder region 411. Thereby, the air flow is generated by the axial fan 29 around all the fins 403.
4). Mounting member In the embodiment, the mounting member 141 has a flat plate shape. However, in the axial fan, as long as it has a contact portion that comes into contact with a portion that easily rises in temperature due to rotation, the mounting member 141 has another shape / structure. Also good.

Other shapes include a bottomed cylindrical shape having a contact portion with the axial fan at the bottom, and a box shape having a hollow portion inside and a contact portion with the axial fan on the outer peripheral surface.
As another structure, a structure having a contact portion with the axial fan in a flat portion and fins in a region other than the flat portion may be used.
In the embodiment, the mounting member 141 has a flat plate shape and a uniform thickness. The axial fan support portion extends from the end of the frame 105 on the fin 21 side and is connected to the extended portion. For this reason, the end surface of the frame 105 on the fin 21 side is substantially flush with the end surface of the support portion.

In such a case, even if the mounting member 141 has a flat plate shape, it can come into contact with the support portion of the axial fan.
However, when the support portion of the axial fan is connected to the extending portion at a position recessed in the center axis direction of the frame, it is difficult to use the support member with a flat mounting member.

In such a case, the mounting member and the support portion can be brought into contact with each other by increasing the thickness of the portion to be in contact with the support portion of the mounting member or by indenting the portion to be in contact with a press or the like. .
Further, in the embodiment, the mounting member 141 and the support portion of the axial fan 29 are in direct contact, but for example, heat dissipation grease with high thermal conductivity (silicone, chemical synthetic oil and metal oxide blended, etc.) Or a heat radiating sheet (for example, silicone rubber, acrylic rubber, ethylene propylene rubber, etc.).

In the embodiment, the mounting member 141 is in contact with one surface of the support portion of the axial fan 29. For example, when the support portion is cylindrical, the attachment member 141 is in contact with the bottom portion and a part of the tube portion. You may make it do.
5. Damping member In the embodiment, the damping member 143 has the same shape and size as the mounting member 141, but the shape and size may not be the same. For example, the mounting member may be larger than the damping member, or the damping member may be larger than the mounting member.

Hereinafter, modified examples of the shape and the like of the damping member will be described.
FIG. 13 is a plan view of a vibration damping member according to Modifications 9 to 11. (A) is a damping member according to Modification 9, (b) is a damping member according to Modification 10, and (c) is a damping member according to Modification 11. In addition, these figures are the figures which looked at the state which mounted the damping member on the upper surface of the instrument main body 23 which concerns on embodiment from the upper direction.

There are a plurality of damping members 503 according to the modification 9, four here. Each damping member 503 has a circular shape in plan view, as shown in FIG. Each vibration damping member 503 has a plate shape in the same manner as the vibration damping member 143 according to the embodiment.
There are a plurality of damping members 523 and 525 according to the modified example 10, two here. As shown in FIG. 13B, each damping member 523, 525 has an annular shape in plan view.

Here, the damping members 523 and 525 have an annular shape with different diameters. The vibration damping members 523 and 525 have a plate shape as in the vibration damping member 143 according to the embodiment. The vibration damping members according to the modified examples 9 and 10 are made of a silicone-based resin material or the like, as in the embodiment.
As shown in FIG. 13C, there are a plurality of damping members 553 according to the eleventh modification, here eight. The eight damping members are arranged at intervals in the circumferential direction with respect to the fin portions 37 (fins 21) of the instrument body 23, here, at equal intervals.

Each damping member 553 is made of an elastic body and is sandwiched between the mounting member and the instrument body 23. As a material of the damping member 553, for example, there is a silicone-based resin material.
The vibration damping member mainly has a function of preventing vibration during rotation of the axial fan from being transmitted to the instrument body. Therefore, the shape, size, structure, and the like of the vibration damping member are not particularly limited as long as it is possible to suppress contact between the mounting member on which the axial fan is mounted and the instrument main body (fin portion). Furthermore, the thermal conductivity of the vibration damping member is lower than that of the mounting member, and it is preferable that the temperature of the mounting member can be prevented from rising due to direct heat conduction from the radiating fin or heat from the heated air around the radiating fin. .
6). Mounting member and damping member In the embodiment and the modification, the mounting member and the damping member are separate members. For example, if the material has high thermal conductivity and high vibration absorption (damping property), A single member may be used. Alternatively, the mounting member and the damping member may be attached and integrated.
7). Light-Emitting Means In the embodiment, a description has been given of the case where an LED is used as the light source of the light-emitting means 25. This is because the life of the axial fan is shorter than the life of the LED in the luminaire using the LED.

However, the present invention can also be applied to an illuminating device provided with a replaceable light source such as a fluorescent lamp. That is, even if the life of the light source is shorter than the life of the axial fan, the life of the axial fan becomes a problem when the light source can be replaced without removing the luminaire from the installation position.
Accordingly, the light emitting means is not limited to a semiconductor light emitting element such as an LED, but may be a conventional light bulb or fluorescent lamp as a light source.
8). In the embodiment, as shown in FIG. 3, the light emitting means 25 is arranged at a position entering the back side of the ceiling from the opening of the reflecting means 27, but for example, near the ceiling opening, that is, on the ceiling In the case where the light emitting means 25 is disposed at a position that does not enter the back side, or when the lighting device is a spotlight downlight, the reflecting means is not necessarily provided.
9. Illumination fixture In the embodiment, the illumination fixture 5 is described as an example of a type in which the light emitting portion 15 is integrated. However, for example, the light emission portion is a type that can be detachably attached to the fixture body (replaceable). There may be.

The detachable structure can be implemented by connecting the wiring connected to the light emitting unit and the wiring connected to the power supply unit using, for example, connectors that are detachable from each other.
10. Illumination Device In the embodiment, the illumination device 1 has been described by taking a downlight type as an example, but other types may be used. Other types may include lighting fixtures having fins and axial fans. For example, an embedded type in which part or all of the fixture body is embedded in the ceiling may be used, or one of the fixture bodies may be embedded in the wall. A bracket type for inserting the part may be used.

  Moreover, although embodiment demonstrated the thing comprised from two units in which the lighting fixture 5 and the power supply unit 3 became a different body as the illuminating device 1, one unit with which the power supply unit was integrated in the lighting fixture. It may be configured from the following.

DESCRIPTION OF SYMBOLS 1 Illuminating device 3 Power supply unit 5 Lighting fixture 21 Fin 23 Appliance main body 29 Axial fan 115 Base (holding part)
141 Mounting member 141c Contact portion 141d Outer portion 141e Bridge portion 143 Damping member 151 Ventilation hole

Claims (9)

In the lighting fixture in which an axial fan that promotes heat release of the heat radiating portion is mounted via a mounting member with respect to the fixture main body having a heat radiating portion that emits heat emitted from the light source during lighting,
The axial fan has a frame on the mounting member and a holding portion for holding the bearing on the center of rotation.
The said holding | maintenance part is contacting the said mounting member. The lighting fixture characterized by the above-mentioned. Between the mounting member and the heat radiating portion, a vibration damping member having higher vibration absorption than the mounting member is interposed,
The lighting apparatus according to claim 1, wherein the mounting member is in contact with the vibration damping member. The mounting member has a plate shape and a vent hole for the axial fan,
The portion of the mounting member that comes into contact with the holding portion is constructed from the outer portion of the vent hole and is located in the vent hole when the mounting member is viewed in plan. The lighting fixture as described in. The mounting member has a plate shape and a plurality of vent holes for the axial fan,
The lighting device according to claim 1, wherein the plurality of vent holes surround a portion that contacts the holding portion when the mounting member is viewed in plan. The lighting apparatus according to claim 3 or 4, wherein a projected area of the mounting member is larger than a projected area of the axial fan. The vibration damping member is plate-shaped,
The lighting fixture according to any one of claims 2 to 5, wherein an outer peripheral shape of the vibration damping member is substantially the same as an outer peripheral shape of the mounting member. The lighting device according to claim 6, wherein a thermal conductivity of the vibration damping member is lower than a thermal conductivity of the mounting member. The lighting device according to claim 1, wherein the mounting member is in contact with the holding portion via a heat dissipation sheet or heat dissipation grease. In a lighting device comprising a lighting fixture having a light source and a power supply unit that turns on the light source,
The said lighting fixture is a lighting fixture of any one of Claims 1-8. The illuminating device characterized by the above-mentioned.

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