JP2013196790A - Lighting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently transfer to a chassis heat generated at a light source.SOLUTION: An angle part 20 for retaining a light source unit 10 is integrally formed with a chassis 2 by folding a part of a platy member constituting the chassis 2.

Description

  The present invention relates to an illuminating device including a light source that emits light from a central portion of an apparatus main body toward an outer edge portion.

  2. Description of the Related Art Conventionally, an illumination device having a light source made of a semiconductor light emitting element such as a light emitting diode (LED) is used.

  For example, Patent Document 1 discloses an illuminating device that includes an LED light source that is provided at the center of the apparatus main body and emits light toward the outer edge of the apparatus main body.

  In the technique of Patent Document 1, eight light source holding portions having a U-shaped cross section for fixing the LED substrate are prepared, and these eight light source holding portions are provided with a regular octagonal peripheral wall at the center of the lighting device. It is fixed to the chassis of the lighting device. Further, in the technique of Patent Document 1, adjacent light source holding portions are fixed and connected with screws or the like. Patent Document 1 describes that heat from an LED module provided on an LED substrate is transmitted to a chassis via a light source holding unit, and the chassis is used as a heat sink.

JP 2011-204700 A (released on October 13, 2011)

  However, in the technique of Patent Document 1, since the chassis of the lighting device and the light source holding unit are provided separately, the heat transfer efficiency is poor, and the heat from the LED module may not be appropriately transferred to the chassis.

  Moreover, in the technique of patent document 1, the area | region where a chassis and a light source holding part overlap is produced in the attachment part of the light source holding part with respect to the chassis of an illuminating device. For this reason, there also exists a problem that the thickness of the direction perpendicular | vertical to the chassis in an illuminating device will increase.

  The present invention has been made in view of the above problems, and its purpose is to reduce the heat generated by a light source in a lighting device including a light source that emits light from the central portion of the device body toward the outer edge portion. It is to efficiently transmit the light to the chassis and to reduce the thickness of the lighting device.

  The illuminating device of the present invention is arranged in a plurality of light source units, a chassis made of plate-like members, and a central portion of the chassis, so that light from each of the light source units is emitted toward the outer edge side of the chassis. A plurality of light source holding portions for holding the light source unit, wherein each of the light source holding portions is integrated with the chassis by bending a part of a plate-like member constituting the chassis. It is formed, and it is characterized by being arranged mutually independently in the central part of the chassis.

  According to the above configuration, since the light source holding part is formed integrally with the chassis by bending a part of the plate-like member constituting the chassis, the light source holding part and the chassis have an integrated structure. Heat transfer characteristics can be improved as compared with the case where the member is provided separately. Therefore, the heat generated in the light source unit can be efficiently transferred to the chassis via the light source holding part.

  Further, unlike the case where the light source holding part is provided separately from the chassis, there is no region where the light source holding part and the chassis overlap, and the light source holding part is erected directly from the surface of the chassis by bending a part of the chassis. Therefore, the thickness of the lighting device can be reduced.

  Moreover, since the light source holding part is formed by bending a part of the plate-like member constituting the chassis, the bent part can be formed in a square shape with a small curvature radius. That is, for example, when the light source holding part is erected by bending a part of the chassis by drawing or the like, the standing part of the light source holding part with respect to the chassis has a curved surface shape with a large radius of curvature. By bending a part of the plate-like member constituting the chassis by mold bending), the bent portion can be formed into a square shape (L-shaped or V-shaped) with a small radius of curvature. Therefore, the light source unit can be held at a position closer to the chassis, and the height of the light source holding part from the chassis can be reduced, so that the thickness of the lighting device can be further reduced.

  In addition, by adopting a configuration in which each light source holding part is arranged independently, when part of the chassis is bent to form each light source holding part, the light source holding parts are notched between each other. Each light source holding part can be bent after being made independent. Therefore, the bending process can be easily performed. Moreover, even if the heat transfer efficiency between the light source unit and the light source holding part is reduced by cutting out the space between the light source holding parts and the contact area between the light source unit and the light source holding part is reduced, the light source holding part and This can be offset by the effect of improving the heat transfer efficiency due to the integral structure with the chassis, and the heat generated in the light source unit can be appropriately transferred to the chassis.

  The plurality of light source holding portions include a plurality of cutout portions cut out from the periphery of the through hole formed in the central portion of the plate-like member toward the outer edge side of the plate-like member along the periphery of the through-hole. It may be formed by bending a part of the plate-like member provided at predetermined intervals and sandwiched between the adjacent notches.

  According to the above configuration, by providing a plurality of cutout portions around the through hole, a part of the plate-like member sandwiched between adjacent cutout portions can be easily bent, so the light source holding portion can be easily Can be formed.

  Further, the light source holding portion includes a standing portion obtained by bending a part of a plate-like member constituting the chassis with respect to the main surface of the chassis, and an end portion of the standing portion opposite to the main surface. It is good also as a structure which has the front-end | tip part bent in the direction facing the said main surface, and hold | maintains the said light source unit by pinching | interposing the said light source unit with the said main surface and the said front-end | tip part.

  According to the above configuration, since the light source unit is sandwiched and supported by the main surface of the chassis and the tip portion of the light source holding portion, the position in the direction perpendicular to the main surface of the light source unit can be stabilized.

  The light source unit includes one of an engaging portion and an engaged portion on a surface facing the main surface and a surface facing the tip portion, and the light source holding portion includes the main surface and the tip. The light source unit may include the other of the engaging portion and the engaged portion, and the light source unit may be held by the light source holding portion by engaging the engaging portion and the engaging portion.

  According to said structure, a light source unit can be stably hold | maintained by a light source holding part by engaging an engaging part and a to-be-engaged part. Moreover, since each light source holding part is arrange | positioned mutually independently, when engaging an engaging part and a to-be-engaged part, a light source holding part can be elastically deformed easily and a light source unit is light-source-held. It can be easily inserted into the part.

  Further, the light source unit includes a substrate provided with a light source and a lens disposed to face the light source, and the light source unit of the engaging portion and the engaged portion is provided as described above. The substrate is provided with an elastic sheet made of an elastic body having thermal conductivity on a surface opposite to the surface facing the lens, and the engagement portion and the engagement portion are provided on the substrate. In the engaged state, the substrate may be configured such that the elastic sheet is in contact with the standing portion and at least a part of the substrate is relatively movable in at least one direction with respect to the lens. Good.

  According to said structure, since the board | substrate can be hold | maintained in the state which made the elastic sheet which has the heat conductivity with which the board | substrate was equipped contact | abutted to the light source holding part, the heat | fever which generate | occur | produced in the light source unit was passed through the light source holding part. Heat can be efficiently transferred to the chassis. In addition, since at least a part of the substrate is held in a state that is relatively movable in at least one direction with respect to the lens, even if a difference in thermal expansion occurs between the substrate and the lens, It is possible to prevent the load from being applied to both the members, and to prevent the noise and the member from being damaged.

  In addition, the main surface of the chassis includes a reflective surface that reflects light, and includes a cover member that covers the main surface so that the light source unit is disposed between the main surface of the chassis and has light transmittance. The upright portion may have a configuration in which an angle formed with the main surface of the chassis is smaller than 90 degrees.

  According to the above configuration, since the optical axis of the light source can be directed to the reflecting surface side, incident light that is directly incident on the cover member without passing through the reflecting surface can be reduced, and the luminance on the light emitting surface of the cover member can be reduced. Generation of unevenness can be suppressed. In addition, since the light source holding part is formed by bending a part of the chassis, it is easy to configure the angle between the standing part and the main surface of the chassis to be 90 degrees or less simply by adjusting the bending angle. realizable.

  As described above, according to the lighting device of the present invention, the heat generated in the light source unit can be efficiently transferred to the chassis via the light source holding part. In addition, the lighting device can be thinned.

It is explanatory drawing which shows the whole structure of the illuminating device concerning one Embodiment of this invention. It is explanatory drawing which shows the state which decomposed | disassembled the main member of the illuminating device shown in FIG. It is explanatory drawing which shows the structure of the chassis with which the illuminating device shown in FIG. 1 is equipped. It is the perspective view, front view, and side view of a light source unit with which the illuminating device shown in FIG. 1 is equipped. It is the front view, side view, and bottom view of the board | substrate with which the light source unit shown in FIG. 4 is equipped. It is a top view of the light source unit shown in FIG. It is explanatory drawing which shows the state which attached the light source unit shown in FIG. 4 to the chassis shown in FIG. It is sectional drawing of the illuminating device concerning the comparative example of this invention. It is explanatory drawing which shows the structure of the lens with which the light source unit shown in FIG. 4 is equipped. (A) And (b) is explanatory drawing which showed typically the locus | trajectory of the light radiate | emitted from the light source unit shown in FIG. (A) is explanatory drawing which showed typically the locus | trajectory of the light radiate | emitted from the said lens at the time of using the lens concerning the comparative example of this invention. (B) is explanatory drawing which showed typically the locus | trajectory of the light radiate | emitted from the said lens at the time of using the lens shown in FIG. (A) is explanatory drawing which showed typically the range of the light condensed on the outer edge part vicinity of an illuminating device with the said lens at the time of using the lens concerning the comparative example of this invention. FIG. 10B is an explanatory diagram schematically showing a range of light condensed by the lens in the vicinity of the outer edge portion of the illumination device when the lens shown in FIG. 9 is used. (A) is explanatory drawing which showed the luminance distribution obtained when the lens concerning the comparative example of this invention is used. (B) is explanatory drawing which showed the luminance distribution obtained when the lens shown in FIG. 9 was used. (A) is explanatory drawing which shows the relationship between the lenses arrange | positioned adjacently, when using the lens concerning the comparative example of this invention. (B) is explanatory drawing which shows the relationship between the lenses arrange | positioned adjacent when the lens shown in FIG. 9 is used. (A) is explanatory drawing which shows the stripe-shaped brightness | luminance unevenness which arises in the vicinity of the adjacent part of lenses when the lens concerning the comparative example of this invention is used. (A) is explanatory drawing which shows the stripe-shaped brightness | luminance unevenness which arises in the vicinity of the adjacent part of lenses when the lens shown in FIG. 9 is used. It is explanatory drawing which shows the state before attaching the reflective sheet in the illuminating device shown in FIG. 1 to a chassis. It is explanatory drawing which shows the operation | work process for attaching a reflective sheet to the chassis of the illuminating device shown in FIG. It is explanatory drawing which shows the structure of the clip for attachment used when attaching a reflective sheet to the chassis of the illuminating device shown in FIG. It is explanatory drawing which shows the state which attached the reflective sheet to the chassis in the illuminating device shown in FIG. (A) is explanatory drawing which shows the modification of the attachment method with respect to the chassis of the reflective sheet in the illuminating device shown in FIG. (B) is explanatory drawing which shows the structure of the fastener used in the attachment method shown to (a). (C) is explanatory drawing which shows the detail of the attaching part in the attachment method shown to (a). It is explanatory drawing which shows the structure of the division unit shown in FIG. 1, and the nightlight light source unit and reflector before attaching to the said division unit. It is a perspective view, a top view, a side view, and a bottom view of the partition unit shown in FIG. It is the top view and sectional drawing of a subillumination unit with which the nightlight light source unit and the reflecting plate were attached to the division unit shown in FIG. FIG. 22 is a front view, a bottom view, and a side view of the nightlight light source unit shown in FIG. 21. It is explanatory drawing which showed typically the locus | trajectory of the light radiate | emitted from the light source shown in FIG. It is explanatory drawing which showed typically the locus | trajectory of the light radiate | emitted from the light source shown in FIG. It is explanatory drawing which shows the luminance distribution in the sub illumination area which the sub illumination unit shown in FIG. 23 illuminates. FIG. 24 is a top view and a cross-sectional view of a modification of the sub-illumination unit in which the nightlight light source unit and the reflector are attached to the partition unit shown in FIG. 23. It is the perspective view and enlarged view which show the whole structure of the illuminating device shown in FIG. It is the upper side figure and sectional drawing of the division unit shown in FIG. FIG. 2 is a top view, a cross-sectional view, and an enlarged view of a ring cover and a center cover shown in FIG. 1.

  An embodiment of the present invention will be described. In addition, although this embodiment demonstrates the case where this invention is applied to the ceiling light attached to ceilings, such as a house, the application object of this invention is not restricted to this.

(1-1. Overall Configuration of Lighting Device 1)
FIG. 1 is an explanatory diagram showing the overall configuration of the lighting device 1 according to the present embodiment, and is a cross-sectional view taken along the line AA shown in the front view (the view seen from the floor side), the side view, and the plan view. Includes figures. Moreover, FIG. 2 is explanatory drawing which shows the state which decomposed | disassembled the main member of the illuminating device 1. FIG.

  As shown in FIGS. 1 and 2, the lighting device 1 includes a chassis 2, a reflection sheet 3, a partition unit 4, a ring cover (cover member) 5, a center cover (cover member) 6, a power supply board 7, and a power supply cover 8. , And an adapter 9.

  The chassis 2 is a disk-shaped member for supporting each part provided in the lighting device 1 and is made of a metal material such as aluminum or iron. The shape and material of the chassis 2 are not limited to this, but have sufficient strength to support each part of the lighting device 1 and dissipate heat generated by the light source unit 10 described later to the outside. Therefore, it is preferable that the material has high thermal conductivity.

  An opening that penetrates from the front side (floor side) to the back side (ceiling side) is provided at the center of the chassis 2, and a part (inner edge) of the chassis 2 is surfaced around the opening. Eight angle portions (support portions) 20 formed by bending to the side (floor surface side) are provided. That is, the angle portion 20 is formed integrally with the chassis 2 by bending a part of the chassis 2. In addition, each angle portion 20 has substantially the same shape, and the ridge formed by the above-described bending (a line segment of two surfaces) is substantially the same as the radiation passing through the center of the circle that forms the outer edge of the chassis 2. They are provided point-symmetrically with respect to the center so as to be orthogonal. Thereby, each angle part 20 is arrange | positioned around the said opening part so that it may comprise a substantially regular octagon when it sees from the floor surface side.

  Moreover, the light source unit 10 is attached to the surface on the outer edge side of the chassis 2 in each angle portion 20. Each light source unit 10 is attached to the angle portion 20 so that the light emission surface faces the outer edge side of the chassis 2. The light emitted from each light source unit 10 mainly enters the reflection sheet 3, is reflected by the reflection sheet 3, enters the ring cover 5, is diffused by the ring cover 5, and is outside the illumination device 1. The light is emitted. A configuration of the light source unit 10 and a method of attaching the light source unit 10 to the angle portion 20 will be described later.

  Moreover, in the area | region between the area | region in which each angle part 20 is provided in the chassis 2, and an outer edge part, the groove part 2a hollowed in the back surface side (ceiling side) and the some groove part 2b connected to the groove part 2a are comprised. Is provided. The groove 2a is provided in a substantially square shape so as to surround the area where each angle portion 20 is provided, and each groove 2b is formed in a direction from the side of the square shape formed by the groove 2a toward the outer edge side of the chassis 2. It is provided in communication with the groove 2a so as to extend. These groove portions 2a and the respective groove portions 2b are for increasing the strength of the chassis 2, and are formed, for example, by drawing the plate-shaped chassis 2. By providing the groove 2a and the groove 2b, the strength of the chassis 2 can be increased, so that the thickness of the chassis 2 can be reduced to reduce the weight of the lighting device 1. In addition, the groove part 2a and the groove part 2b are not essential structures, You may use the chassis 2 which is not provided with these each part.

  The reflection sheet 3 is a sheet-like member for reflecting the light emitted from the light source unit 10, and is a connecting portion (chassis 2 and angle portion 20 between the chassis 2 and each angle portion 20 from the outer edge portion of the chassis 2. Is attached to the chassis 2 so as to cover the area up to the bent portion (the ridge). The reflection sheet 3 is attached to the chassis 2 so that the reflection surface is substantially flat. The configuration of the reflection sheet 3 is not particularly limited, and various conventionally known reflection sheets can be used, for example. The details of the shape of the reflection sheet 3 and the method of attaching to the chassis 2 will be described later.

  The partition unit 4 is made of a material having light reflectivity, and is attached to the chassis 2 so as to be accommodated inside the eight angle portions 20 (on the center side of a circle formed by the outer edge of the chassis 2). Thereby, the partition unit 4 partitions the main illumination area, which is an area illuminated by the light emitted from the light source unit 10, and the sub-illumination area (nightlight area) formed inside the main illumination area. The light of the illumination area is prevented from entering the sub illumination area, and the light of the sub illumination area is prevented from entering the main illumination area. Further, the partition unit 4 prevents stray light caused by a corner portion (end portion in the longitudinal direction) of the lens 11 described later from being directly irradiated to the ring cover 5 or the center cover 6. A light source (nightlight light source) for illuminating the sub-illumination area is provided inside the partition unit 4. The compartment unit 4 and the configuration inside the compartment unit 4 will be described later.

  The ring cover 5 is a ring-shaped cover member having a circular opening at the center, and has a function of diffusing the light emitted from the light source unit 10 and emitting it to the outside of the illumination device 1. The material of the ring cover 5 is not particularly limited as long as it has light diffusibility. For example, a conventionally known material can be used. In this embodiment, the ring cover 5 made of milky white polycarbonate resin is used.

  The center cover 6 includes a disc portion 6 a made of a disc-shaped member having light diffusibility and a ring-shaped light shielding portion (light shielding member) 6 b having a light shielding property, and is provided at the center of the ring cover 5. It is attached to the ring cover 5 so as to cover the formed opening. As the disc portion 6a, for example, a material similar to that of the ring cover 5 can be used. In this embodiment, the disc part 6a which consists of milky white polycarbonate resin was used. The light shielding part 6b is not particularly limited as long as it is a material having a light shielding property. For example, a metal member such as aluminum or iron, or a resin ring member that does not transmit light can be used. . In addition, a hole 6c is provided in a part of the light shielding portion 6b. An optical sensor (not shown) for detecting the brightness around the illumination device 1 is disposed at a position corresponding to the hole 6c.

  In addition, the light-shielding part 6b has a shape and a size that can reduce luminance unevenness and the like generated in the outer edge part of the partition unit 4, the angle part 20, the light source unit 10, and the adjacent part of the light source units 10 from the floor surface side. Is formed. When the lighting device 1 is viewed from the floor side, the main illumination area and the sub-illumination area (nightlight area) are separated from each other with the center cover 6 as a boundary. The disc portion 6a is a sub-illumination area (nightlight area). In the present embodiment, as shown in FIG. 1, the inner diameter of the light shielding portion 6b is 149 mm, the outer diameter is 187 mm, and the outer diameter of the disc portion 6a is 205.6 mm. The outer diameter of the ring cover 5 is 650 mm, and the distance in the direction parallel to the reflection surface of the reflection sheet 3 from the outer edge of the ring cover 5 to the opening provided at the center is 244.2 mm. The outer edge of the center cover 6 and the inner edge of the ring cover 5 are attached so as to partially overlap. In the present embodiment, the light shielding portion 6b is positioned inside the center cover 6 so that the disc portion 6a is also positioned outside the light shielding portion 6b. However, the light shielding portion 6b is provided at the outer edge of the center cover 6. The disc portion 6a may be positioned only inside the light shielding portion 6b.

  The power supply board 7 is a circuit board for receiving power supplied from the outside of the lighting device 1 and supplying the power to each part of the lighting device 1. Further, the power supply board 7 is provided with a control unit (not shown) for controlling the light emission state of each light source in accordance with an instruction from the user, a detection result of the above-described optical sensor, or the like.

  The power supply cover 8 is a member for protecting the power supply board 7 and is attached to the chassis 2 so as to cover the power supply board 7. In the present embodiment, as shown in FIG. 1, the thickness of the lighting device 1 (the height from the floor surface side surface of the center cover 6 to the ceiling surface side surface of the power supply cover 8) is 78.3 mm. It is. The height from the floor side surface of the center cover 6 to the reflecting surface of the reflecting sheet 3 is 33.8 mm.

  The adapter 9 is for attaching the lighting device 1 to the ceiling, and is provided on the ceiling through the openings provided in the power supply cover 8, the power supply substrate 7, the chassis 2, the reflection sheet 3, and the partition unit 4. It is attached to a ceiling-side mounting member (not shown) (so-called hook ceiling or hook rosette), and fixes the lighting device 1 to the ceiling.

  Specifically, at both ends in the diametrical direction of the adapter 9, there are provided movable portions 9a urged by an elastic member (not shown) such as a spring toward the diametrically outer side. And after attaching the adapter 9 to a ceiling side attachment member, the opening part provided in the center part of these members in the state which assembled the power supply cover 8, the power supply board 7, the chassis 2, the reflective sheet 3, and the division unit 4 When these members are pushed up to the ceiling side so that the adapter 9 is inserted into the (through hole), the movable portion 9a of the adapter 9 comes into contact with the inner edge of the partition unit 4 and is pushed inward in the diameter direction. When the above members are further pushed up to the ceiling side, the inner edge portion of the partition unit 4 passes through the contact portion with the movable portion 9a of the adapter 9, and the state where the movable portion 9a is pushed inward in the diameter direction is released. The Accordingly, the partition unit 4 is held in a state of being sandwiched between the ceiling and the movable portion 9a of the adapter 9, and thereby the lighting device 1 is fixed to the ceiling.

  Further, the adapter 9 has an electrical connection part electrically connected to a power supply part provided in the ceiling side mounting member, and a power supply for supplying the power supplied through the power supply part to the power supply board 7. Cable (not shown). When the adapter 9 is attached to the ceiling side mounting member, the electrical connection portion of the adapter 9 is electrically connected to the power supply unit provided on the ceiling side mounting member. Then, by connecting the power cable of the adapter 9 to a connection portion (not shown) provided on the power supply board 7, the power supply portion of the ceiling side mounting member, the electrical connection portion of the adapter 9, and the power cable are used. Power is supplied to the power supply board 7. In addition, although mentioned later for details, in this embodiment, after connecting the power cable of the adapter 9 to the power supply board 7, this power cable is accommodated between the adapter 9 and the partition unit 4 along the outer periphery of the adapter 9. It can be done. Details of the power cable housing will be described later.

(1-2. Configuration of Angle Unit 20 and Light Source Unit 10)
FIG. 3 is an explanatory diagram showing the configuration of the floor surface side of the chassis 2 and the configuration of the light source unit 10 before being attached to the angle portion 20 of the chassis 2. In FIG. 3, the reflection sheet 3 is not shown.

  As shown in FIG. 3, each angle portion 20 is substantially perpendicular to the inner edge side of the chassis 2 with respect to the plane portion of the chassis 2 (a surface installed in parallel to the ceiling in the chassis 2, a top surface portion, a main surface). In a direction substantially perpendicular to the standing portion 21 such that the standing portion 21 formed by bending so as to form a sharp ridge angle (pointed corner) and the tip of the standing portion 21 face the outer edge side of the chassis 2 And a front end portion (bottom surface portion) 22 formed so as to face the plane portion of the chassis 2 substantially in parallel. In other words, each angle portion 20 is erected from a planar portion (front surface) of the chassis 2, and an end portion of the erected portion 21 on the opposite side of the planar portion of the chassis 2 to the outer edge side of the chassis 2. And an extended distal end portion 22.

  The standing portion 21 has a trapezoidal shape whose width becomes narrower from the chassis 2 side toward the distal end portion 22. The distal end portion 22 has a trapezoidal shape with a width that decreases as the distance from the standing portion 21 increases, and a corner portion of the end portion farther from the standing portion 21 is chamfered. Therefore, the angle portions 20 are notched between each other, and each angle portion 20 has a space between the other angle portions 20 adjacent to each other, and is erected on the inner edge portion of the chassis 2 independently of each other. ing.

  In the present embodiment, when forming the angle portion 20, first, an opening (through hole) 25 for inserting the adapter 0 is formed by cutting the center portion of the plate-like chassis 2, and each The angle portion 20 is formed with portions that become the standing portion 21 and the tip portion 22. Specifically, a plurality of cutouts 26 cut out from the peripheral edge of the opening 25 toward the outer edge side of the chassis 2 are formed around the opening 25 at predetermined intervals. Thereby, the notch part 26 is formed between the parts used as the adjacent standing part 21 and the front-end | tip part 22. FIG. After that, the portion that becomes the standing portion 21 (a part of the chassis 2 sandwiched between the adjacent notches 26 and 26) is bent in a direction substantially perpendicular to the plane portion of the chassis 2, and the tip portion 22 is further raised. It is bent in a direction substantially perpendicular to the installation portion 21. Note that the tip portion 22 may be bent first with respect to the standing portion 21 and then the standing portion 21 may be bent with respect to the flat portion of the chassis 2.

  Thus, the above-mentioned ridge angle can be formed by forming the upright portion 21 with respect to the flat portion of the chassis 2 and then standing up by bending. By forming such a ridge angle, the light source unit 10 can be stably held, and the height of the standing portion 21 from the chassis 2 can be reduced to make the lighting device 1 thinner. Further, since the chassis 2 and the angle portion 20 are integrally formed, the thermal conductivity between the chassis 2 and the angle portion 20 can be improved, so that the heat generated in the light source unit 10 is transmitted through the angle portion. Can be efficiently transmitted to the chassis 2 and dissipated.

  In addition, although it is conceivable to form the angle portion 20 by drawing or the like, in that case, it is difficult to make the bent portion of the standing portion 21 to have the ridge angle as described above. A corner portion between the angle portion 20 and the standing portion 21 becomes a curved surface having a large curvature radius. As a result, the height of the angle portion 20 is increased in order to obtain a flat portion for attaching the light source unit 10 to the standing portion 21, and the thickness of the lighting device 1 is increased.

  In addition, it is conceivable that the angle portion 20 is formed separately from the chassis 2 and attached to the chassis 2, but in that case, heat transfer characteristics from the light source unit 10 to the chassis 2 are reduced, and the light source unit 10 The generated heat may not be dissipated sufficiently. Moreover, when the screw etc. for attaching the angle part 20 to the chassis 2 protrude on the reflective surface of the chassis 2, an optical characteristic may be adversely affected. Further, in order to improve the heat transfer characteristics, it is conceivable to sandwich a heat transfer sheet with high thermal conductivity between the angle portion 20 and the chassis 2, but in that case, the number of parts and work process increase, Manufacturing cost will increase.

  Moreover, in this embodiment, when forming the angle part 20, as mentioned above, the center part of the plate-shaped chassis 2 is cut and the part which becomes the standing part 21 and the front-end | tip part 22 in each angle part 20 is used. Bending is performed after forming. Therefore, the adjacent angle portions 20 are separated from each other, and are erected on the inner edge portion of the chassis 2 independently of each other. As a result, when the light source unit 10 is attached to the angle portion 20 such that the light source unit 10 is sandwiched between the flat portion of the chassis 2 (the portion facing the tip portion 22) and the tip portion 22 of the angle portion 20, the angle portion The light source unit 10 can be easily attached by elastically deforming 20.

  In the prior art, it is common to increase the contact area between the angle portion and the light source unit as much as possible in order to more efficiently transmit the heat generated in the light source unit to the chassis for heat dissipation. It was. For this reason, it is general that each angle portion is connected to each other. In order to realize this configuration, the angle portion 20 is formed separately from the chassis 2 and attached to the chassis 2. Therefore, in the conventional technique, since the elastic deformation of the angle portion is hindered by the adjacent angle portion, the light source unit is held in the angle portion by sandwiching the light source unit between the tip portion of the angle portion and the flat portion of the chassis 2. It was difficult to attach to.

  On the other hand, in this embodiment, the standing portion 21 of the angle portion 20 has a trapezoidal shape, and each angle portion 20 stands independently from each other. For this reason, when attaching the light source unit 10 to the angle part 20, the angle part 20 can be easily elastically deformed, and the light source unit 10 can be attached easily.

  In the present embodiment, there is a region where the angle portion 20 is not provided in a region facing the substrate 12 at both ends in the longitudinal direction of the substrate 12. For this reason, the heat transfer efficiency between the board | substrate 12 and an angle part falls compared with the case where an angle part is provided in the whole region of the opposing part of the board | substrate 12. FIG. However, in this embodiment, since the effect of improving the heat dissipation characteristics can be obtained by integrating the angle portion 20 and the chassis 2, the angle portion 20 is formed in the region facing the both ends in the longitudinal direction of the substrate 12 as described above. Even when there is a region where no is provided, heat generated by the light sources L1 to L3 can be transferred from the substrate 12 to the chassis 2 via the angle portion 20 to be appropriately dissipated.

  As shown in FIG. 3, engagement holes (engaged portions) 23 a and 23 b are provided at the distal end portion 22 of each angle portion 20, and in the vicinity of each angle portion 20 in the planar portion of the chassis 2 ( Two engaging hole portions (engaged portions) 23c and 23d are provided in a portion facing the tip portion 22. Further, insertion holes 23e and 23f are provided in the standing portion 21 in each angle portion 20.

  4 is a perspective view of the light source unit 10, a front view (a plan view seen from the floor surface side), and a side view (a plan view seen from the light emitting side surface of the lens 11 provided in the light source unit 10). As shown in this figure, the light source unit 10 includes a lens 11 and a substrate 12 having a shape extending in one direction (first direction).

  The lens 11 is for refracting light emitted from a light source provided on the substrate 12 and emitting the light in a predetermined direction. The material of the lens 11 is not particularly limited. For example, a lens made of a transparent acrylic resin can be used. In addition, although mentioned later for details, the lens 11 has the optical characteristic which mainly condenses the light which injected from the light source to the area | region close | similar to the outer edge part in the reflective sheet 3, Thereby, substantially the whole area of the reflective sheet 3 is made. A substantially uniform illuminance distribution can be formed over substantially the entire area of the ring cover 5 by the light irradiated with substantially uniform illuminance and reflected by the reflecting sheet 3.

  As shown in FIG. 4, ribs 14 a and 14 b are provided on one end surface (surface disposed on the floor surface side) parallel to the longitudinal direction of the lens 11, and the width direction of the lens 11 in the ribs 14 a and 14 b ( Engagement claw parts (engagement convex parts) 13a and 13b are provided on the outer end face in the short direction. Also, ribs 14c to 14g are provided on the other end surface (surface disposed on the ceiling side) opposite to the one end surface, and the end surfaces on the outer side in the width direction (short direction) of the ribs 14c and 14d are related. Joint claw portions (engagement convex portions) 13c and 13d are provided. The engaging claw portions 13a and 13b are provided at positions corresponding to the engaging hole portions 23a and 23b provided in the tip portion 22 of the angle portion 20, and the engaging claw portions 13c and 13d are provided in the chassis 2. It is provided at a position corresponding to the engagement holes 23c and 23d. The ribs 14e and 14f are provided at positions corresponding to the connectors C1 and C2 provided on the substrate 12. As shown in FIGS. 3 and 4, the light source unit 10 has protrusions 13 e and 13 f that protrude toward the angle portion 20 on the surface disposed on the angle portion 20 side.

  5 is a front view of the substrate 12 (a plan view of the surface facing the lens 11), a bottom view (a plan view of a surface disposed on the floor surface side), and a side view (from the horizontal direction to the longitudinal direction on the ceiling surface). It is the top view which looked at the end surface).

  As shown in FIG. 5, the substrate 12 includes a substrate body 12a, and an elastic sheet (sheet-like member) 12b made of an elastic body attached to the back surface (surface disposed on the angle portion 20 side) of the substrate body 12a. It has. The material of the substrate main body 12a and the elastic sheet 12b is not particularly limited, but heat generated by the light source provided in the substrate main body 12a is transferred to the chassis 2 through the substrate main body 12a and the elastic sheet 12b to be dissipated. Therefore, it is preferable to use a material having high thermal conductivity (for example, a silicone resin). In this embodiment, an elastic sheet 12b having a thickness of 0.3 mm is used.

  On the light emitting surface side of the substrate body 12a, five light sources (LED) L1 that emit white light, five light sources (LED) L2 that emit light bulb-colored light, and red light are emitted. Connectors C1 and C2 for connecting two light sources (LEDs) L3 and connection terminals of electrical wiring (electrical wiring for connecting each substrate 12 to another adjacent substrate 12 or power supply substrate 7) to the substrate 12 And. The connection terminals of the electrical wiring are detachable from the connectors C1 and C2 in the normal direction of the substrate surface of the substrate 12.

  In the present embodiment, the ring cover 5 can emit light in white, light bulb color, and cherry blossom (orange pink) color by controlling the light emission state of the light source of each color. The light sources L1 to L3 are arranged in the order of L1, L2, L3, L1, L2, L1, L2, L1, L2, L3, L1, L2 along the length direction (longitudinal direction) of the substrate 12. Yes. The light sources L <b> 1 to L <b> 3 are provided so that the principal axis direction (optical axis direction) of light emitted from each of the light sources is perpendicular to the substrate surface of the substrate 12. The light sources L <b> 1 to L <b> 3 are provided such that the emission centers are arranged on the same straight line along the length direction (longitudinal direction) of the substrate 12. In the light source L2, the position of the wiring connection portion (not shown) is turned upside down in the width direction (short direction) of the substrate 12 with respect to the position of the wiring connection portion (not shown) of the light sources L1 and L3. Is arranged. With this arrangement, in the substrate 12 in which the plurality of light sources L1 to L3 are arranged only on one side, the wiring connected to the light sources L1 to L3 is patterned in a space-saving manner without intersecting in the substrate 12. Can do. Further, even when the lens 11 having a shape extending along the longitudinal direction of the substrate 12 is used, the light emission method according to the type of the light source can be made equal. However, the arrangement position and the number of the light sources L1 to L3, the color of the emitted light of each light source, the type of the light source (number of colors), etc. are not limited to this, and the size and shape of each part of the lighting device 1 are required. You may change suitably according to an optical characteristic etc. Further, by controlling the light emission states of the light sources L1 to L3, in addition to the respective colors, it may be possible to adjust to other colors (for example, intermediate colors of the respective colors).

  In addition, insertion holes 12c and 12d penetrating the substrate body 12a and the elastic sheet 12b are provided at positions corresponding to the protruding portions 13e and 13f of the lens 11 on the substrate 12.

  FIG. 6 is a plan view of the lens 11 and the surface of the substrate 12 that are disposed on the ceiling side in a state where the protruding portions 13e and 13f of the lens 11 are inserted into the insertion holes 12c and 12d of the substrate 12, respectively. As shown in this figure, the heights of the protruding portions 13e and 13f of the lens 11 are higher than the thickness of the substrate 12, and when the protruding portions 13e and 13f are inserted into the insertion holes 12c and 12d of the substrate 12, the protruding portions 13e. , 13f protrudes to the back surface side of the substrate 12 (the surface facing the angle portion 20).

  Further, the above-described ribs (second rib members) 14e and 14f are provided at positions corresponding to the connectors C1 and C2 of the substrate 12 in the lens 11. Thus, when the lens 11 and the substrate 12 are attached to the angle portion 20, the ribs 14e and 14f abut against the connection terminals t1 and t2 of the electrical wiring connected to the connectors C1 and C2, and the connection terminals t1 and t2 are connected to the connector. Pressing in the direction of C1, C2. At this time, since the elastic sheet 12b is provided on the back side of the substrate 12, the connection terminals t1, t2 and the connectors C1, C2 are elastically pressed by the elastic force of the elastic sheet 12b. In the present embodiment, the ribs 14e and 14f of the lens 11 are in contact with the connection terminals t1 and t2 of the electrical wiring. However, the present invention is not limited to this. For example, the connection terminals t1 and t2 are in contact with the connectors C1 and C2. It is good also as a structure which presses connector C1, C2.

  Some conventional connectors for connecting electrical wiring include a locking mechanism for preventing the connected electrical wiring from falling out of the connector. However, such a locking mechanism is provided. The connector is larger in size and more expensive than a connector without a locking mechanism. For this reason, when such a connector is used, the optical characteristics of the light source unit are reduced, the light source unit is enlarged, and the manufacturing cost of the lighting device 1 is increased.

  On the other hand, in this embodiment, small and inexpensive connectors that do not include a lock mechanism are used as the connectors C1 and C2. As described above, the ribs 14e and 14f of the lens 11 abut against the connection terminals t1 and t2 of the electric wiring connected to the connectors C1 and C2, and press the connection terminals t1 and t2 against the connectors C1 and C2. The connection terminals t1 and t2 are prevented from being disconnected from the connectors C1 and C2. Thereby, since the board | substrate 12 can be reduced in size by using small connector C1, C2 rather than the case where the connector provided with the lock function is used, the optical characteristic of the light source unit 10 is not deteriorated, The lighting device 1 can be thinned by narrowing the width (length in the short direction).

  In order to prevent the connection terminal of the electrical wiring from being detached from the connector, it is conceivable to fix the connection terminal and the connector with an adhesive. There is a risk of causing contact failure due to adhesion to the electrical connection portion. In addition, it is conceivable to fix the end portion of the electrical wiring on the substrate by soldering without using a connector, but in that case, the work process increases and the manufacturing cost increases.

  In addition, the light source unit 10 is attached to the angle portion 20 on the surfaces of the ribs 14c and 14d except for the engaging claws 13c and 13d among the surfaces disposed on the flat surface portion (opposite portion of the tip portion 22) of the chassis 2. Then, it is formed so as to come into contact with the flat portion of the chassis 2 via the reflection sheet 3 (contact with the reflection sheet 3 and press against the flat portion of the chassis 2). Further, the portions of the ribs 14a and 14b other than the engaging claw portions 13a and 13b in the surface disposed on the distal end portion 22 side of the angle portion 20 are formed on the angle portion 20 when the light source unit 10 is attached to the angle portion 20. It is formed so as to abut on the tip portion 22. Thereby, the light source unit 10 can be sandwiched between the flat portion of the chassis 2 and the tip portion 22 of the angle portion 20 and can be stably held, and the position in the direction perpendicular to the flat portion of the chassis 2 is accurately defined. Can be done.

  Further, the surfaces of the ribs (first rib members) 14 a to 14 d and 14 g on the substrate 12 side are formed so as to abut on the substrate surface of the substrate 12 when the light source unit 10 is mounted on the angle portion 20. Thereby, the relative position of the lens 11 and the substrate 12 in the normal direction of the substrate surface can be accurately defined. In the present embodiment, the substrate-side surfaces of the five ribs 14 a to 14 d and 14 g are in surface contact with the substrate 12. Thereby, the contact area between the substrate 12 and the lens 11 is made larger than when the contact area is smaller than that or when the lens and the substrate are fixed with screws or the like, and the pressure generated between the substrate 12 and the lens 11 is reduced. Can be small. Therefore, it is possible to more appropriately prevent the generation of sound and damage.

  7 is a plan view showing the light source unit 10 attached to the angle part 20 (viewed from the floor side), an enlarged view of the F part shown in the plan view, a perspective view of the F part, and the enlarged view. It is sectional drawing of the B1-B1 cross section shown in the figure, the B2-B2 cross section, and the B3-B3 cross section.

  When the light source unit 10 is attached to the angle portion 20, the lens 11 is pushed into the standing portion 21 side of the angle portion 20 with the substrate 12 being sandwiched between the lens 11 and the standing portion 21 of the angle portion 20. At this time, the angle portion 20 is elastically deformed and pushed in a direction in which the distance between the tip portion 22 and the planar portion of the chassis 2 (a portion facing the tip portion 22) increases as the lens 11 contacts the tip portion 22. .

  When the lens 11 is pushed to a predetermined mounting position, the engaging claws 13a, 13b, 13c, 13d of the lens 11 are fitted into the engaging holes 23a, 23b, 23c, 23d, respectively (B2-B2 in FIG. 7). The elastic deformation of the angle portion 20 is released, and the original shape is restored. More specifically, the engaging claws 13a and 13b of the lens 11 disposed on the flat surface side of the chassis 2 that is less elastically deformed than the angle portion 20 are first fitted into the engaging holes 23a and 23b, and then the chassis. The engaging claw portions 13c and 13d disposed on the distal end portion 22 side of the angle portion 20 that is more easily elastically deformed than the two flat portions are fitted into the engaging hole portions 23c and 23d. Further, as shown in FIG. 4, the surface on the exit surface side of the lens 11 in the engaging claw portions 13 a to 13 d is substantially parallel to the substrate surface of the substrate 12, and the lens 11 in the engaging claw portions 13 a to 13 d. The end face in the short direction is inclined with respect to the substrate surface. Thereby, in a state where the engaging claw portions 13a to 13d are fitted in the engaging hole portions 23a to 23d, the lens 11 is moved away from the standing portion 21 of the angle portion 20 by the elastic force of the elastic sheet 12b provided on the substrate 12. The surface on the exit surface side of the lens 11 in the engaging claws 13a to 13d is pressed against the surface on the exit surface side of the lens 11 in the engagement holes 23a to 23d. Thereby, the light source unit 10 is held by the angle portion 20. When the light source unit 10 is held by the angle portion 20, the surfaces of the ribs 14 a, 14 b, 14 c, 14 d, and 14 g of the lens 11 on the side of the substrate 12 come into contact with the substrate 12, thereby Press against the standing part 21 side. Thus, the elastic sheet 12b attached to the back surface of the substrate 12 is in close contact with the standing portion 21 while being elastically deformed by being sandwiched between the substrate body 12a and the standing portion 21 of the angle portion 20, and the substrate 12 is angled. It is elastically held between the standing part 21 of the part 20 and the lens 11. Further, in this state, the protruding portions 13e and 13f of the lens 11 pass through the insertion holes 12c and 12d of the substrate 12 and are accommodated in the insertion holes 23e and 23f provided in the standing portion 21 of the angle portion 20, respectively. (See B2-B2 cross-sectional view in FIG. 7). Further, in this state, the ribs 14e and 14f of the lens 11 abut against the connection terminals t1 and t2 of the electric wiring, and the connection terminals t1 and t2 are pressed against the connectors C1 and C2 (see the section B1-B1 in FIG. 7).

  The conventional technology only considers fixing the lens to the lens holding portion attached to the chassis with a screw or the like. Generally, in order to give the lens holding portion sufficient strength and from the substrate In order to improve the heat transfer characteristics to the chassis, the lens holding portions were connected to each other. For this reason, it is difficult for the conventional technique to mount the lens so as to be sandwiched between the lens holding portion (angle portion 20) and the chassis 2 as in the present embodiment. On the other hand, in this embodiment, the angle part 20 is formed by bending a part of the chassis 2, and the angle part 20 is formed in a trapezoidal shape whose width becomes narrower toward the tip part 22 side. The angle portions 20 are notched between each other. For this reason, by pushing the lens 11 between the front end portion 22 of the angle portion 20 and the flat portion of the chassis 2, the angle portion 20 can be easily elastically deformed, and the lens 11 is placed in a predetermined mounting position (engaged). Since the claw portions 13a, 13b, 13c, and 13d can be easily attached to positions where the claw portions 13a, 13b, 13c, and 13d are fitted into the engagement holes 23a, 23b, 23c, and 23d, the work of attaching the light source unit 10 to the angle portion 20 is facilitated. .

  In the present embodiment, the longitudinal width of the lens 11 in the engagement hole portions 23a, 23b, and 23d is the portion inserted into the engagement hole portions 23a, 23b, and 23d in the engagement claw portions 13a, 13b, and 13d. Is set to be sufficiently wider than the width in this direction. Further, the width in the length direction (longitudinal direction) of the lens 11 in the insertion hole 12 c provided in the substrate 12 and the insertion hole 23 e provided in the angle portion 20 is larger than the width of the protruding portion 13 e of the lens 11 in that direction. It is set wide enough. Further, the width in the longitudinal direction of the lens 11 in the engagement hole 23c is set to a width corresponding to the width in the direction of the portion inserted into the engagement hole 23c in the engagement claw 13c (both They are set to the same width, or the difference between the two is set to a minute difference that allows the engagement claw portion 13c to be inserted). Further, the width in the longitudinal direction of the lens 11 in the insertion hole 12d provided in the substrate 12 is set to a width corresponding to the width in the direction of the protruding portion 13f of the lens 11 (whether both are set to the same width). Alternatively, the difference between the two is set to a minute difference that allows the protrusion 13f to be inserted).

  Thereby, when the lens 11 is thermally expanded, the lens 11 can move relative to the substrate 12 and the angle portion 20 in the longitudinal direction of the lens 11 and the substrate 12. Further, the substrate 12 is movable relative to the lens 11 in the longitudinal direction of the substrate 12. Therefore, even if a difference in thermal expansion amount in the longitudinal direction occurs between the angle portion 20, the lens 11, and the substrate 12 due to heat generated by the light sources L <b> 1 to L <b> 3, Since the displacement is not constrained, the application of thermal stress between these members is reduced, and the lens 11 is thermally expanded to cause noise and damage to the members due to the force applied between the substrate 12 and the angle portion 20. It can be prevented from occurring.

  The longitudinal width of the lens 11 in the engagement hole 23c is set to a width corresponding to the width in the direction of the portion of the engagement claw 13c inserted into the engagement hole 23c. 11 expands or contracts in the longitudinal direction with the portion of the engaging claw 13c mounted in the engaging hole 23c as a reference position (a position where the relative position with respect to the angle portion 20 does not change). Further, the width in the longitudinal direction of the lens 11 in the insertion hole 12d provided in the substrate 12 is set to a width corresponding to the width in the direction of the protruding portion 13f of the lens 11, so that the substrate 12 has the insertion hole 12d. The lens 11 expands or contracts relative to the lens 11 in the longitudinal direction as a reference position (a position where the relative position with respect to the lens 11 does not change). This allows the lens 11 and the substrate 12 to move relative to the angle portion 20 in the longitudinal direction, and allows the lens 11 to move relative to the substrate 12 in the longitudinal direction. In addition, the reference position in the longitudinal direction of the substrate 12 can be defined to suppress the relative positional deviation between the lens 11 and the light sources L1 to L3. The engagement claw portion as the reference position is not limited to the engagement claw portion 13c, but in order to reduce the deviation of the light irradiation range in the lens longitudinal direction by the light source unit 10, the longitudinal direction of the lens 11 is used. It is more preferable to select an engagement claw portion that is close to the center.

  In this embodiment, the width of the engagement hole 23a, 23b, 23c, 23d in the thickness direction of the lens 11 (the direction in which the standing portion 21 of the angle portion 20 faces the lens 11) is set to the engagement claw portion. 13a, 13b, 13c, 13d is set to a width corresponding to the width in the direction of the portion inserted into the engagement holes 23a, 23b, 23c, 23d (both are set to the same width, or The difference between the two is set to such a minute difference that the engaging claws 13a, 13b, 13c, and 13d can be inserted). Further, a substrate 12 having an elastic sheet 12b on the contact surface with the angle portion 20 is sandwiched between the lens 11 and the angle portion 20. Further, the amount of thermal expansion in the thickness direction of the lens 11 is relatively small compared to the amount of thermal expansion in the longitudinal direction of the lens 11. For this reason, even if thermal expansion in the thickness direction occurs in the lens 11 due to heat generated in the light sources L1 to L3, the thermal expansion can be absorbed by elastic deformation of the elastic sheet 12b. The relative position and the relative angle of the lens 11 and the angle portion 20 in the thickness direction of the lens 11 can be kept substantially constant. Further, since the stress acting between the lens 11 and the angle portion 20 due to thermal expansion in the thickness direction of the lens 11 is reduced by the elastic sheet 12b, the lens 11 is damaged by the stress acting in the direction. And the generation of noise.

  Further, since the lens 11 is elastically held by the elastic force of the angle portion 20 between the tip portion 22 of the angle portion 20 and the flat portion of the chassis 2 (a portion facing the tip portion 22), the light sources L1 to L1. Due to the heat generated in L3, thermal expansion of the lens 11 in the width direction (a direction parallel to the substrate surface of the substrate 12 and perpendicular to the longitudinal direction of the substrate 12; a direction perpendicular to the plane portion of the chassis 2). Even if it occurs, this thermal expansion can be absorbed by the elastic deformation of the angle portion 20, and the relative movement amount of the lens 11 and the angle portion 20 in the width direction of the lens 11 is determined by the elastic deformation of the angle portion 20. Can be limited within the range.

  Further, the width in the width direction (short direction) of the lens 11 in the insertion holes 12c and 12d provided in the substrate 12 is set to a width corresponding to the width of the protrusions 13e and 13f of the lens 11 in the direction. . In addition, the width in the width direction (short direction) of the lens 11 in the insertion holes 23e and 23f provided in the angle portion 20 is set wider than the width of the protrusions 13e and 13f of the lens 11 in the corresponding direction. Has been. Thereby, the relative position in the width direction between the substrate 12 and the lens 11 is maintained substantially constant regardless of the presence or absence of thermal expansion. Further, since the protruding portions 13e and 13f are gently inserted into the insertion holes 23e and 23f, the lens 11 and the substrate 12 can move in a direction perpendicular to the surface of the chassis 2 with respect to the angle portion 20. That is, the substrate 12 and the lens 11 are positioned so that the relative positions of the lens 11 and the substrate 12 in the width direction are not changed by the fitting of the insertion holes 12c and 12d and the protruding portions 13e and 13f. It moves substantially integrally with the part 20. Thereby, the shift | offset | difference of the optical axis about the width direction of the lens 11 can be prevented. Even if a difference in thermal expansion occurs between the lens 11 and the angle portion 20, the lens 11 is elastically held between the chassis 2 and the tip portion 22, and the angle portion Since it can move relative to 20, it is possible to prevent or suppress the occurrence of noise and damage. Note that the insertion holes 23e and 23f are not essential, and the position of the lens 11 in the vertical direction with respect to the substrate 12 can be defined as long as at least the protruding portions 13e and 13f are inserted into the insertion holes 12c and 12d.

  As described above, the lens 11 and the substrate 12 are relatively movable with respect to the angle portion 20 in the longitudinal direction of each member, while the relative movement in the thickness direction and the width direction is limited. . Further, the lens 11 and the substrate 12 move integrally in the width direction of these members. That is, the lens 11 and the substrate 12 are restricted from moving in a direction perpendicular to the reflecting surface of the reflecting sheet 3 and in a direction parallel to the reflecting surface of the reflecting sheet 3 and perpendicular to the substrate surface of the substrate 12. The relative angles of the lens 11 and the substrate 12 with respect to the reflecting surface of the reflecting sheet 3 are maintained substantially constant. Therefore, even when the light source unit 10 (the lens 11 and the substrate 12) moves in a direction parallel to the reflection surface of the reflection sheet 3 (longitudinal direction of the light source unit 10), the light emitted from the light source unit 10 is reflected. Since the condensing characteristic in the radial direction of the reflection sheet 3 with respect to the reflection surface of the sheet 3 can be kept substantially constant, the entire area of the ring cover 5 can be illuminated with substantially uniform luminance.

  In the present embodiment, the standing portion 21 of the angle portion 20 is bent substantially perpendicularly to the planar portion of the chassis 2, but the inclination angle of the standing portion 21 with respect to the planar portion of the chassis 2 is limited to this. is not. It is sufficient that the plane portion of the chassis 2 and the standing portion 21 of the angle portion 20 intersect each other. For example, the inclination angle of the standing portion 21 with respect to the plane portion of the chassis 2 is an acute angle, and the optical axes of the light sources L1 to L3 The substrate surface of the substrate 12 may be directed to the reflection surface side rather than the direction perpendicular to the reflection surface of the reflection sheet 3 so that the surface of the substrate 12 faces the flat surface side. That is, the angle formed by the standing portion 21 and the main surface of the chassis 2 may be smaller than 90 degrees.

  By making the angle between the standing portion 21 and the main surface of the chassis 2 smaller than 90 degrees, the optical axis of the light source can be directed to the main surface side (reflective surface side) of the chassis 2, Light incident directly on the ring cover 5 without being interposed can be reduced, and the occurrence of uneven brightness on the light emitting surface of the ring cover 5 can be suppressed. Since the standing portion 21 is formed by bending a part of the chassis 2, the angle formed by the standing portion 21 and the main surface of the chassis 2 is smaller than 90 degrees simply by adjusting the bending angle. Can be easily formed at an angle.

  In this embodiment, the lens 11 is provided with engagement claw portions (engagement portions) 13 a to 13 d, engagement holes (engaged portions) 23 a and 23 b at the tip portion 22 of the angle portion 20, and the chassis 2. Although the engagement hole portions (engaged portions) 23c and 23d are provided in the vicinity of the angle portion 20 in the plane portion, the present invention is not limited to this. For example, engagement claw portions (engagement portions) are provided on the tip portion 22 of the angle portion 20 and the flat portion of the chassis 2, and engagement holes (engaged portions) that engage the lens 11 with the engagement claw portions. ) May be provided.

  Moreover, in this embodiment, although the angle part 20 is formed by bending the inner edge part of the chassis 2, it is not restricted to this. For example, the angle portion 20 may be provided separately from the chassis 2 and attached to the chassis 2, or the angle portion 20 may be formed by standing the inner edge portion of the chassis 2 by drawing.

(1-3. Configuration and Optical Characteristics of Lens 11 Provided in Light Source Unit 10)
(1-3-1. Prevention of luminance reduction in the vicinity of the outer edge of the lighting device 1)
As shown in FIG. 1, in this embodiment, the chassis 2 is formed in a substantially disc shape, and a flat reflection sheet 3 is attached to the surface of the chassis 2. Thereby, for example, the thickness of the lighting device 1 can be reduced compared to the case of using the chassis 1002 having a shape curved toward the floor side toward the outer edge as in the lighting device 1000 according to the comparative example shown in FIG. It is like that.

By the way, in order to emit light over substantially the entire area of the ring cover 5 with substantially uniform luminance, it is necessary to form a uniform illuminance distribution over the substantially entire area of the reflection sheet 3 by the light emitted from the light source unit 10. However, when the illuminating device 1 is thinned using the flat reflection sheet 3 as in the present embodiment, the distance from the light source unit 10 to the reflection sheet increases toward the outer edge side of the reflection sheet 3. Illuminance particularly tends to decrease on the outer edge side of the reflection sheet 3. Specifically, the illuminance E is an index indicating the luminous flux per unit area, and is proportional to the luminous intensity I of light emitted from the light source and inversely proportional to the square of the distance x from the light source to the light incident position of the reflection sheet 3. , Cos ² θ (θ is an incident angle of the light emitted from the light source with respect to the surface of the reflection sheet 3) (E∝ (I · cos ² θ) / x ² ). For this reason, the illuminance I tends to become smaller toward the outer edge side of the reflection sheet 3.

  Therefore, in the conventional lighting device, like the lighting device 1000 according to the comparative example shown in FIG. 8, the chassis 1002 having a shape curved toward the floor side toward the outer edge side is used, so that the chassis 1002 can be changed from the light source. The illuminance distribution is made uniform by reducing the change in the distance connecting the light source and the light incident surface of the chassis 1002 according to the change in the light emission angle toward each position.

  However, when the chassis 1002 is curved toward the floor side toward the outer edge as in the lighting device 1000 according to the comparative example, the thickness of the lighting device (the height in the direction perpendicular to the ceiling surface) is increased. Since it becomes thick, the utilization efficiency of indoor space falls and gives a user a feeling of oppression. In general, it is known that the illumination device provided on the ceiling can make the room feel brighter by illuminating the ceiling surface. In the illumination device 1000 according to the comparative example, the outer edge portion of the illumination device 1000 is known. The amount of light emitted from the ceiling in the direction horizontal to the ceiling or the ceiling is reduced, and the ceiling surface cannot be illuminated brightly.

  Therefore, in the present embodiment, by using the flat reflection sheet 3 and using the lens 11 having optical characteristics that mainly collects the light emitted from the light sources L1 to L3 in the vicinity of the outer edge portion of the reflection sheet 3. The luminous intensity I of the light emitted toward the outer edge of the reflection sheet 3 is increased to form a substantially uniform illuminance distribution over substantially the entire reflection surface of the reflection sheet 3. Thereby, in the illuminating device 1 concerning this embodiment, the substantially whole area (substantially whole area of the main illumination area | region) of the ring cover 5 can be light-emitted with substantially uniform brightness | luminance, and a ceiling surface can be illuminated brightly, and The lighting device 1 can be made thinner so that the indoor space can be felt wider.

  FIG. 9 is a plan view of the lens 11 viewed from the short side (side disposed on the floor surface side), a side view viewed from the longitudinal direction, a cross-sectional view of the central portion in the longitudinal direction (CC cross-sectional view), and It is sectional drawing (DD sectional drawing) of the longitudinal direction edge part vicinity. As shown in this figure, the light source unit 10 has a length (length in the longitudinal direction) of 66 mm. The width of the light source unit 10 (the length from the contact surface of the ribs 14a, 14b with the tip 22 of the angle portion 20 to the contact surface of the ribs 14c, 14d, 14g with the flat surface of the chassis 2) is 27. 0.7 mm, which is substantially equal to the height of the angle portion 20. The height of the engaging claws 13a and 13b (the height from the contact surface of the angle portion 20 with the tip 22 of the ribs 14a and 14b) is 1.2 mm, and the engaging claws 13c and 13d The height (height from the contact surface of the ribs 14c and 14d with the flat portion of the chassis 2) is 0.9 mm.

  The lens 11 includes light incident surfaces 11a to 11c arranged to face the light sources L1 to L3, total reflection surfaces 11d and 11e that substantially totally reflect light incident into the lens 11 from the light incident surfaces 11a to 11c, and And light exit surfaces 11f to 11g.

  The light incident surfaces 11a to 11c have curved surfaces that are convex toward the light sources L1 to L3. In the present embodiment, the light sources L1 to L3 are arranged at positions facing the substantially central portion of the light incident surface 11b in the width direction of the lens 11 (direction perpendicular to the ceiling surface).

  The total reflection surfaces 11 d and 11 e have a curved surface shape that is convex toward the outside of the lens 11. The total reflection surface (second total reflection surface) 11d and the total reflection surface (first total reflection surface) 11e are asymmetric with respect to a straight line perpendicular to the substrate surface of the substrate 12. Specifically, the total reflection surface 11d and the total reflection surface 11e are such that the angle formed between the tangent of the curved surface formed by both the total reflection surfaces and a straight line perpendicular to the substrate surface is the total reflection surface 11d. It is smaller than 11e.

  The light exit surfaces 11 f and 11 h have a curved surface shape that is concave on the inside of the lens 11, and the light exit surface 11 g has a curved surface shape that is convex on the outside of the lens 11. Further, the connecting portion between the light emitting surface (second concave surface) 11f and the light emitting surface (first convex surface) 11g and the connecting portion between the light emitting surface 11g and the light emitting surface (first concave surface) 11h have continuous curvature. It has become a smooth curved surface.

  Further, the vertex (center of the convex surface) of the light emitting surface 11g in the direction perpendicular to the extending direction of the lens 11 is more toward the vertex β at the longitudinal end portion of the lens 11 than the vertex α at the longitudinal center portion of the lens 11. Is located on the reflection sheet 3 side (reflection surface side). Thereby, the light incident on the lens 11 from the light source located at both ends in the extending direction of the substrate 12 is compared with the light incident on the lens 11 from the light source located in the center in the extending direction of the substrate 12. Irradiates to the center of the direction. As a result, it is possible to more appropriately prevent light emitted from both ends of the lens 11 in the extending direction from overlapping at the outer edge of the reflecting surface.

  FIG. 10A and FIG. 10B are explanatory diagrams schematically showing the trajectory of light emitted from the light sources L1 to L3.

  As shown in these figures, the light incident on the light incident surface 11a from the light sources L1 to L3 is refracted by the light incident surface 11a, enters the total reflection surface 11d, is totally reflected by the total reflection surface 11d, and is a light emission surface. It is incident on 11f. Further, the light incident on the light incident surface 11b from the light sources L1 to L3 is refracted by the light incident surface 11b and enters the light emitting surface 11g. In addition, the light incident on the light incident surface 11c from the light sources L1 to L3 is refracted by the light incident surface 11c, is incident on the total reflection surface 11e, is totally reflected on the total reflection surface 11e, and is incident on the light emission surface 11h.

  Then, these lights incident on the light emitting surfaces 11 f to 11 g are refracted at each light emitting surface, emitted to the outside of the lens 11, and mainly focused on a region near the outer edge portion of the reflection sheet 3. Accordingly, in the present embodiment, a substantially uniform illuminance distribution can be formed over substantially the entire area of the ring cover 5.

  In addition, the structure of the lens 11 for mainly condensing the light radiate | emitted from the light source to the area | region of the outer edge part of the reflective sheet 3 is not restricted to the structure mentioned above. For example, the total reflection surface 11d and the total reflection surface 11e are symmetrical with respect to a straight line perpendicular to the substrate surface of the substrate 12, and the light sources L1 to L3 are arranged in the width direction of the lens 11 on the light incident surface 11b (perpendicular to the ceiling surface). It is good also as a structure arrange | positioned in the position which opposes the position of the light-incidence surface 11c side (ceiling surface side) rather than the center of a (right direction). However, in this configuration, the influence on the optical characteristics of the light source unit 10 when the relative position or relative angle between the lens 11 and the light sources L1 to L3 slightly deviates due to manufacturing errors or the like causes the light sources L1 to L3 to change to the light incident surface 11b. It becomes larger than the case where it arrange | positions in the position facing the center of the width direction (direction perpendicular | vertical to a ceiling surface) of the lens 11 in. For this reason, in order to prevent variation in the optical characteristics of the light source unit 10, the light sources L1 to L3 are approximately in the width direction of the lens 11 (direction perpendicular to the ceiling surface) on the light incident surface 11b as in the configuration described above. More preferably, the total reflection surface 11d and the total reflection surface 11e are arranged in a position opposite to the central portion and asymmetric with respect to a straight line perpendicular to the substrate surface of the substrate 12. That is, by making the distances from the light sources L1 to L3 to the light incident surfaces 11a and 11c of the lens 11 longer, it is possible to more appropriately prevent the deterioration of the optical characteristics due to the positional deviation of the lens 11.

(1-3-2. Prevention of uneven brightness in the vicinity of the outer edge of the lighting device 1)
As described above, particularly when the reflecting surface is a plane like the reflecting sheet 13 of the present embodiment, in order to cause the ring cover 5 to emit light uniformly uniformly, the light emitted from the lens 11 is reflected by the reflecting sheet 3. Therefore, it is necessary to design the lens 11 so that the light is mainly focused on a region in the vicinity of the outer edge. When condensing light in a region in the vicinity of the outer edge of the reflection sheet 13, the outer edge of the reflection sheet 3 is obtained by making the shape of the light exit surface of the lens 11 uniform in the longitudinal direction of the lens 11 as in the conventional illumination device. In a region near the part, a region where a condensing region of light emitted from the adjacent lens 11 is superimposed may be recognized as luminance unevenness.

  On the other hand, in this embodiment, as shown in FIG. 9, the shape of the light emitting surface 11 g of the lens 11 is arranged along the longitudinal direction of the lens 11 with the center portion in the longitudinal direction facing the outside of the lens 11. It has a curved surface that is convex. Thereby, the outgoing angle to the direction parallel to the reflective surface of the reflective sheet 3 of the light emitted from the light sources L1 to L3 can be narrowed down. Therefore, the condensing region of the light emitted from the light source unit 10 arranged adjacent to the region near the outer edge portion on the reflecting surface of the reflecting sheet 3 is prevented or reduced, and the luminance unevenness is visually recognized. Can be prevented.

  This point will be described in more detail with reference to FIGS. FIG. 11A shows the lens 1011 when the lens 1011 according to the comparative example in which the shape of the light emitting surface of the lens 11 according to the present embodiment is changed to a uniform shape along the longitudinal direction of the lens 11 is used. It is explanatory drawing which showed typically the locus | trajectory of the light radiate | emitted from. FIG. 11B is an explanatory diagram schematically showing the locus of light emitted from the lens 11 according to the present embodiment. FIG. 12A is an explanatory diagram schematically showing the range of light condensed near the outer edge of the reflection sheet 3 by the lens 1011 according to the comparative example, and FIG. It is explanatory drawing shown typically which showed the range of the light condensed on the outer edge part vicinity of the reflective sheet 3 by the lens 11 concerning. FIG. 13A is an explanatory diagram showing the luminance distribution in each region of the ring cover 5 when the lens 1011 according to the comparative example is used, and FIG. 13B uses the lens 11 according to the present embodiment. It is explanatory drawing which shows the luminance distribution in each area | region of the ring cover 5 in the case of being.

  As shown in FIG. 11A, in the case of the lens 1011 according to the comparative example, the light exit surface of the lens 1011 is uniform along the longitudinal direction of the lens 1011. The light distribution angle in the longitudinal direction of 1011 becomes relatively wide. As a result, as shown in FIG. 12A, when the lens 1011 according to the comparative example is used, the condensing region of the light emitted from the adjacent lens 1011 in the vicinity of the outer edge of the reflection sheet 3 is superimposed. An area to be generated occurs. For this reason, as shown to Fig.13 (a), the brightness | luminance of the area | region where the condensing area | region of the light radiate | emitted from the adjacent lens 1011 overlaps becomes higher than a surrounding area | region, and it will be visually recognized as brightness irregularity.

  On the other hand, as shown in FIG. 11B, the lens 11 according to the present embodiment has a curved shape in which the central portion in the longitudinal direction is convex toward the outside of the lens 11, so that reflection is possible. The emission angle in the direction parallel to the reflection surface of the sheet 3 can be reduced, and the light distribution angle of the light emitted from the lens 11 in the longitudinal direction of the lens 11 can be made relatively narrow. As a result, as shown in FIG. 12B, when the lens 11 according to the present embodiment is used, the condensing region of the light emitted from the adjacent lens 11 in the vicinity of the outer edge portion of the reflective sheet 3 is Superposition can be prevented or reduced. Thereby, as shown in FIG.13 (b), it can prevent or reduce that the brightness nonuniformity arises in the substantially whole region of the ring cover 5. FIG.

  When the reflecting surface is formed in a flat plate shape as in this embodiment, in order to cause the ring cover 5 to emit light uniformly, each lens is configured so that light is mainly condensed near the outer edge of the reflecting surface. 11 need to be designed. In addition, when the light is mainly collected in the vicinity of the outer edge portion of the reflecting surface by each lens 11 as described above, the emitted light from the lenses 11 arranged adjacent to each other in the vicinity of the outer edge portion of the reflecting surface is superimposed. When a region is generated, the luminance of the region is particularly high, and the luminance unevenness is easily manifested. On the other hand, as in the present embodiment, the shape of the light exit surface 11g of the lens 11 is a curved shape in which the central portion in the longitudinal direction is convex toward the outside of the lens 11 along the longitudinal direction of the lens 11. Thus, it is possible to prevent or suppress the superimposition of light from the lenses 11 arranged adjacent to each other in the vicinity of the outer edge portion of the reflecting surface, thereby preventing uneven brightness. That is, the above-mentioned effect obtained by making the shape of the light emitting surface 11g of the lens 11 the above shape is particularly effective in the configuration including the planar reflecting surface as in this embodiment.

(1-3-3. Prevention of luminance unevenness in adjacent portions of light source units 10)
Further, in the embodiment, the shape of both end portions in the longitudinal direction of the lenses 11 provided in each light source unit 10 is the angle formed by the opposing surfaces of the end portions of the adjacent lenses 11 (or the tangent of the opposing surfaces is The angle formed by θ is an angle larger than 0 °. As a result, in the present embodiment, streak-like luminance unevenness is prevented from occurring in the vicinity of the opposing portion of the end portions of the lenses 11 arranged adjacent to each other.

  This point will be described in more detail with reference to FIGS. 14 and 15. FIG. 14A illustrates the relationship between adjacent lenses when the lens 1011 according to the comparative example formed so that the opposing surfaces of adjacent lenses are parallel to each other is used. FIG. FIG. 14B is an explanatory diagram showing the relationship between adjacent lenses when the lens 11 according to the present embodiment is used. FIG. 15A is an explanatory diagram showing streaky luminance unevenness X generated in the vicinity of adjacent portions of the lenses 1011 when the lens 1011 according to the comparative example is used. FIG. 15B is an explanatory diagram showing a state of stripe-like luminance unevenness Y generated in the vicinity of adjacent lenses 11 when the lens 11 according to the present embodiment is used.

  As shown in FIG. 14A, when the lens 1011 according to the comparative example is used, the opposing surfaces 1011s of the adjacent lenses 1011 are arranged so as to be parallel to each other. For this reason, as indicated by a broken line in FIG. 14A, the light that has reached the facing surface 1011s of each adjacent lens 1011 facing the other lens 1011 is reflected by the facing surface 1011s and is the diameter of the illumination device. The light is emitted in a direction close to the direction. As a result, streaky bright lines are generated by light emitted in substantially the same direction in the vicinity of the facing portion between the adjacent lenses 1011. As a result, as shown in FIG. 15A, the ring cover 5 is visually recognized as stripe-like luminance unevenness in the adjacent portion to the center cover 6. In the area where the lenses face each other, the amount of light emitted from the light source and reaching the area is less than that in the central part in the longitudinal direction of the lens 11, so it is slightly darker than in the central part in the longitudinal direction. For this reason, when the streak-like bright line as described above is generated, it is particularly easy to visually recognize luminance unevenness.

  On the other hand, when the lens 11 according to the present embodiment is used, the distance between the facing surfaces 11s of the adjacent lenses 11 becomes wider toward the outer edge side of the lighting device 1, and the facing surfaces 11s of the adjacent lenses 11 are increased. Is set to an angle larger than 0 °, that is, an angle at which the opposing surfaces 11s are not parallel to each other (shown in FIG. 14B). In the example, θ = 45 °).

  As a result, as indicated by a broken line in FIG. 14B, the light reflected by the facing surface 11 s of each adjacent lens 11 facing the other lens 11 is emitted in a direction close to the longitudinal direction of each lens 11. The Thereby, the emission direction of the light radiate | emitted in the adjacent part of adjacent lenses 11 can be made into the direction which leaves | separates mutually. Therefore, as shown in FIG. 15B, it is possible to suppress the occurrence of stripe-like luminance unevenness due to light emitted from both end portions of both adjacent lenses.

  Further, as shown in FIG. 15B, the light emitted through the facing surface 11 s of each adjacent lens 11 with the other lens 11 is close to the light emitting surface along the longitudinal direction of each lens 11. Since it can radiate | emit in the direction (direction close | similar to the circumferential direction of the illuminating device 1), the range where a brightness | luminance becomes high can be shortened in the radial direction of an illuminating device. Thereby, the range in which the luminance is increased is shielded by the light shielding portion 6b of the center cover 6 disposed in the vicinity of the light emitting surface along the longitudinal direction of the lens 11 so as not to be emitted to the outside of the illumination device 1. can do. Further, even if the above-described range in which the luminance is increased slightly outside the light shielding portion 6 b, the translucent disc portion 6 a located in the region outside the light shielding portion 6 b overlaps the ring cover 5. The light emitted from this region can be sufficiently diffused by the disc portion 6a and the ring cover 5. Accordingly, it is possible to more surely prevent streaky luminance unevenness from being visually recognized in the main illumination area (area where the ring cover 5 is disposed).

  In other words, the light that is reflected and emitted from the facing surface 11 s of each adjacent lens 11 facing the other lens 11 is a direction close to the light emitting surface along the longitudinal direction of the lens 11 (in the circumferential direction of the illumination device 1). Therefore, it is possible to limit a region where luminance unevenness may occur to a region close to the light source unit 10. Therefore, it is possible to reduce the area of the center cover 6 for covering a region where uneven brightness may occur, and to increase the area of the ring cover 5 accordingly, the range of the main illumination region can be expanded.

  In the present embodiment, it is sufficient that the angle θ is larger than 0 °. However, in order to obtain a sufficient effect of suppressing streaky luminance unevenness, the angle θ should be 30 degrees or more. Is preferable, and it is more preferably about 45 degrees.

  However, if the angle θ is too large, the light emitted from the light source is emitted from the end face without being reflected by the end face in the longitudinal direction of the lens 11, and directly to the ring cover 5 without passing through the reflecting face of the reflecting sheet 3. Irradiation may cause uneven brightness. In addition, if the angle θ is too large, the area of the light exit surface along the longitudinal direction of the lens 11 becomes small, so that it is difficult to form a uniform illuminance distribution over the entire circumferential direction of the reflective sheet 3. There is.

  For this reason, the angle θ is the incident angle of the light emitted from the light source disposed at the position closest to the facing surface of the lens 11 with the adjacent lens 11 (the normal of the facing surface and the light). Is an angle that makes the critical angle (minimum angle at which total reflection occurs) equal to or greater than the critical angle. That is, as described above, each light source is arranged so that the principal axis direction of the light emitted from each light source is perpendicular to the substrate surface of the substrate 12, and thus is emitted in the normal direction of the substrate surface. As the amount of light is the largest and the angle of inclination with respect to the normal direction of the substrate surface increases, the amount of emitted light decreases. For this reason, the amount of light emitted from each light source that reaches the end of the lens 11 in the longitudinal direction becomes stronger as the light emitted from the light source near the end. Therefore, by setting the end face in the longitudinal direction of the lens 11 to an angle at which the light emitted from the light source closest to the end face is totally reflected, the light emitted from the light source is emitted in the direction of the adjacent lens 11. This can prevent brightness unevenness more appropriately.

  The angle θ is emitted from the end surface of the lens 11 when viewed from a direction perpendicular to the reflecting surface of the reflecting sheet 3 (opposite direction of the ring cover 5 (or the center cover 6) and the light source unit 10). It is preferable to set the angle formed by the bright line formed when light enters the ring cover 5 (or the center cover 6) and the tangent to the light exit surface of the lens 11 to be 45 degrees or less. In the case of the substantially circular illumination device 1 as in the present embodiment, the angle θ is an emission line formed by the light emitted from the end face of the lens 11 entering the ring cover 5 (or the center cover 6). And the angle formed by the radial direction of the circular shape formed by the lighting device 1 is preferably set to be greater than 45 °. As a result, the area of the center cover 6 for covering the area where the uneven brightness may occur can be further reduced, and accordingly, the area of the ring cover 5 can be increased to broaden the range of the main illumination area. it can.

(1-4. Configuration and Mounting Method of Reflective Sheet 3)
Next, a method for attaching the reflection sheet 3 to the chassis 2 will be described.

  In the present embodiment, as described above, the chassis 2 has a substantially flat plate shape, and the planar reflection sheet 3 is attached to the substantially flat plate-like chassis 2. In a conventional ceiling light using an LED as a light source, in order to make the luminance of the light emitting surface uniform, the reflecting surface is generally curved as in the comparative example shown in FIG. Further, among the conventionally known reflection sheets, there are special ones that can be attached to a curved attachment surface, but they are very expensive for a reflection sheet attached to a flat surface. For this reason, in general ceiling lights, a curved chassis is used, and the surface of the chassis is generally coated with a white paint without using a reflective sheet to form a reflective surface. Only rate was obtained. On the other hand, in this embodiment, it is set as the structure which attaches the reflective sheet 3 to the chassis 2 planarly, thereby enabling to use a relatively inexpensive planar reflective sheet 3 and 99% or more. High reflectivity is obtained. However, the present invention is not limited to the configuration using the reflection sheet 3, and the surface of the chassis 2 is used as a reflection surface by applying a light-reflecting paint (white paint or the like) to the surface of the chassis 2. May be.

  FIG. 16 is an explanatory view showing a state before the reflection sheet 3 is attached to the chassis 2. As shown in this figure, the outer edge portion of the reflection sheet 3 has a substantially circular shape corresponding to the outer edge portion of the chassis 2.

  Further, the end portion 3g on the inner edge side of the reflection sheet 3 has a shape corresponding to a bent portion of each angle portion 20 (a bent portion between each angle portion 20 and the chassis 2). That is, the end portion 3 g on the inner edge side of the reflection sheet 3 has a shape corresponding to the substantially octagonal shape formed by each angle portion 20. Further, in each corner portion of the substantially octagonal shape at the inner edge portion of the reflection sheet 3 (positions corresponding to both end portions of the tip portion 22 in each angle portion 20, that is, positions corresponding to between the angle portions 20), A slit 3 a cut into a groove shape is provided along the radial direction of the circle formed by the outer edge of the reflection sheet 3. Further, at a position corresponding to the engagement hole portions 23c and 23d provided in the chassis 2 on the inner edge side of the reflection sheet 3, a notch portion in which the end portion 3g is cut out in a shape corresponding to the engagement hole portions 23c and 23d. 3b and 3c are provided.

  In addition, an insertion hole 3d for inserting a mounting clip (mounting member) 31a is provided at a position (first region) facing the outer side in the radial direction of the reflecting sheet 3 with respect to each of the slits 3a in the reflecting sheet 3. Is provided. Further, on the radiation of a circle formed by the outer edge portion of the chassis 2 passing through the midpoint of the line segment (ridge line) formed by the bent portion between each angle portion 20 and the chassis 2 and outside the insertion hole 3d in the reflection sheet 3 The insertion hole 3e for inserting the attachment clip (attachment member) 31b is provided at the position (second region). That is, each insertion hole 3e is provided radially outward from each insertion hole 3d, and each insertion hole 3d and each insertion hole 3e are alternately provided in the circumferential direction.

  FIG. 17 is an explanatory diagram showing a state when the reflection sheet 3 is installed on the surface of the chassis 2. As shown in this figure, when the reflection sheet 3 is placed on the surface of the chassis 2, the end portion 3 g on the inner edge side of the reflection sheet 3 comes into contact with the front end portion 22 of the angle portion 20 and gets on. However, since the slits 3a are provided at positions corresponding to both ends of each angle portion 20 in the reflection sheet 3, when the portion of the reflection sheet 3 that has landed on the tip portion 22 of the angle portion 20 is lightly pressed toward the chassis 2 side, The portion between the slits 3 a in the reflection sheet 3 is bent and passes through the contact portion with the tip portion 22. Thereby, the entirety of the reflection sheet 3 is arranged on the chassis 2 in a planar shape.

  As described above, in the present embodiment, since the angle portion 20 is formed by bending a part of the chassis 2, there is no step even in the vicinity of the angle portion 20 on the surface of the chassis 2. 3 can be installed flat. That is, when the angle portion 20 is provided separately from the chassis 2, a portion where the chassis 2 and the angle portion 20 overlap is generated, so that a step corresponding to the plate thickness of the angle portion 20 and the angle portion 20 are fixed to the chassis 2. However, in the present embodiment, the angle portion 20 and the chassis 2 are an integrated structure in which a single plate member is bent, so that such a step does not occur.

  Further, when the angle portion 20 and the chassis 2 are integrated as in the present embodiment, the angle portion cannot be attached to the chassis after the reflection sheet is attached to the surface of the chassis as in the conventional lighting device. It is necessary to attach the reflection sheet 3 to the chassis 2 from above the angle portion 20. On the other hand, according to the configuration of the present embodiment, since the reflection sheet 3 has slits at positions corresponding to both ends of the tip portion 22 of the angle portion 20, the reflection sheet 3 is partially attached at the time of attachment. Can be bent. Accordingly, it is possible to prevent the angle portion 20 from interfering with the attachment of the reflection sheet 3 and to easily attach the reflection sheet 3 so as to cover a region facing the tip portion 22 of the angle portion 20 on the surface of the chassis 2. .

  In addition, the end portion 3g on the inner edge side of the reflection sheet 3 is provided with cutout portions 3b and 3c cut out in a shape corresponding to the engagement hole portions 23c and 23d. When the light source unit 10 is attached to the angle portion 20 after the reflection sheet 3 is installed, the engagement claw portions 13c and 13d of the light source unit 10 are engaged with the engagement hole portions of the chassis 2 through the cutout portions 3b and 3c. 23c and 23d are inserted and engaged. Thereby, the reflection sheet 3 is pressed against the chassis 2 by the ribs 14 c and 14 d of the lens 11. The reflection sheet 3 is disposed in a planar shape in a region from the outer edge side end portion of the chassis 2 through a region between the light source unit 10 and the chassis 2 to a bent portion between the angle portion 20 and the chassis 2. The As a result, even when there is light leaking from the total reflection surface 11e of the lens 11 to the chassis 2 side, the light is reflected by the reflecting sheet 3 arranged so as to extend to the facing portion between the lens 11 and the chassis 2 and effective. Can be used.

  And after arrange | positioning the reflective sheet 3 on the chassis 2 as mentioned above, the clip 31a, 31b for attachment is provided in the position corresponding to each insertion hole 3d, 3e in the chassis 2 via each insertion hole 3d, 3e. The reflective sheet 3 is fixed to the chassis 2 by being inserted into the insertion holes 24a and 24b.

  FIG. 18 is an explanatory view showing a state in which the mounting clips 31 a and 31 b are inserted into the insertion holes 24 a and 24 b of the chassis 2 through the insertion holes 3 d and 3 e of the reflection sheet 3. As shown in this figure, the mounting clips 31a and 31b include a head portion 32, an insertion portion 33, and a slit portion 34 in which the tip of the insertion portion 33 is cut out in the radial direction. The inserted portion 33 has a tip portion having an outer diameter longer than the inner diameters of the insertion holes 3d and 3e and a root portion having an outer diameter narrower than the inner diameters of the insertion holes 3d and 3e. In the present embodiment, the thickness of the reflection sheet 3 is 0.5 mm, the thickness of the chassis 2 is 1.5 mm, and the length of the root portion is 2.0 mm.

  When the distal end portion of the insertion portion 33 in the mounting clips 31a and 31b is pushed into the insertion holes 3d and 3e of the reflection sheet 3, the outer peripheral side of the distal end portion of the insertion portion 33 comes into contact with the insertion holes 3d and 3e and the slit portion 34 is obtained. The distal end portion of the insertion portion 33 is elastically deformed in the direction in which the width of the insertion portion 33 decreases. When the mounting clips 31a and 31b are further pushed in, the distal end portion of the inserted portion 33 passes through the insertion holes 3d and 3e of the reflection sheet 3 to release the elastic deformation of the distal end portion, and the outer diameter of the distal end portion is the insertion hole. It is wider than the inner diameters of 3d and 3e. Thereby, the attachment clips 31a and 31b restrict the movement of the reflection sheet 3 in the direction perpendicular to the reflection surface so as to sandwich the chassis 2 and the reflection sheet 3. Thereby, it is possible to prevent uneven brightness from occurring in the ring cover 5 (main illumination region) due to the reflection sheet 3 expanding and contracting due to thermal expansion and the like, and the reflection surface of the reflection sheet 3 undulating.

  As described above, the 0 outer diameters of the base portions of the mounting clips 31a and 31b are narrower than the inner diameters of the insertion holes 3d and 3e. Thereby, the attachment clips 31a and 31b prevent the reflection sheet 3 from lifting from the chassis 2, and the attachment clips 31a and 31b even when the reflection sheet 3 expands and contracts due to thermal deformation in the in-plane direction. The reflection sheet 3 is allowed to move within the range of the difference between the outer diameter of the base portion of the lens and the inner diameters of the insertion holes 3d and 3e.

  FIG. 19 is an explanatory view showing a state where the reflection sheet 3 is attached to the chassis 2. As shown in this figure, the reflection sheet 3 is attached to the chassis 2 by attachment clips 31a and 31b inserted into the insertion holes 3d and 3e.

  Further, as shown in FIG. 19, the surface on the chassis 2 side in the vicinity of the outer edge portion (third region) of the reflection sheet 3 is fixed to the chassis 2 by the double-sided tape 35. Note that the double-sided tape 35 is preferably thin enough that the double-sided tape 35 does not cause a step that affects the reflection characteristics of the reflective sheet 3.

  As described above, in the present embodiment, the relatively thick reflective sheet 3 having a thickness of 0.5 mm is used, and the thermal deformation of the reflective sheet 3 occurs due to the strength of the waist of the reflective sheet 3 itself. Even if it exists, the reflective sheet 3 becomes difficult to wave.

  In the present embodiment, a region in the vicinity of the inner edge side end portion 3 g of the reflection sheet 3 is attached to the chassis 2 by the lens 11, the attachment clip 31 a, and the screw 36. Thereby, although the vicinity of the inner edge side end portion 3g of the reflection sheet 3 is likely to be thermally deformed by the heat transferred from the substrate 12, it is possible to appropriately prevent the reflection sheet 3 from undulating due to the heat deformation.

  In addition, although it is also conceivable to attach the substantially entire region of the reflection sheet 3 to the chassis 2 with a double-sided tape, in that case, particularly in the region close to the inner edge side (region close to the angle portion 20), for example, the reflection sheet 3 and the chassis As a result, the air confined between the two is thermally expanded or the reflective sheet 3 is thermally deformed. Moreover, when the reflection sheet 3 is wavy, the luminance distribution in the ring cover 5 may become non-uniform and may be visually recognized as luminance unevenness.

  Further, since each insertion hole 3d is arranged in a region between each light source unit 10, that is, a region where the light emitted from the light source unit 10 is not easily collected, the mounting clip 31a attached to each insertion hole 3d. Can be prevented from affecting the optical characteristics of the illumination device 1.

  Moreover, each insertion hole 3e is provided in the radial direction outer side than each insertion hole 3d, and each insertion hole 3d and each insertion hole 3e are provided alternately along the circumferential direction. As a result, the mounting positions of the mounting clips 31a and 31b are dispersed along the circumferential direction, and the mounting positions of the mounting clips 31a and 31b are evenly arranged on the reflecting sheet 3 without being partially biased. It is possible to more suitably prevent the sheet 3 from undulating.

  When the position of each insertion hole 3e in the radial direction of the reflection sheet 3 is too radially outside, the distance to the ring cover 5 at that position becomes too short, and the mounting clip inserted into each insertion hole 3e. Luminance unevenness caused by light reflected by 31b or the mounting clip 31b may be visually recognized through the ring cover 5. That is, the illumination device 1 is thinner toward the outer edge side, and the distance between the reflection sheet 3 and the ring cover 5 is shorter toward the outer extension side. For this reason, if there is a member (for example, the head of the mounting clips 31a and 31b) that protrudes from the reflection surface of the reflection sheet 3 to the ring cover 5 side in the vicinity of the outer edge side of the reflection sheet 3, the protrusion or the protrusion In some cases, the luminance unevenness caused by the phenomenon is visually recognized through the ring cover 5. For this reason, the position of each insertion hole 3e in the radial direction of the reflection sheet 3 is such that the interval between the attachment clip 31b inserted into each insertion hole 3e and the ring cover 5 is determined by the attachment clip 31b or the attachment clip 31b. It is preferable that the brightness unevenness caused by the reflected light is disposed within a range that is not visible through the ring cover 5.

  In the present embodiment, the insertion holes 3 d and 3 e are arranged point-symmetrically with respect to the center of the circle formed by the outer edge of the reflection sheet 3. Thereby, when the unevenness in brightness caused by the light reflected by the mounting clips 31a and 31b or the mounting clips 31a and 31b inserted into the respective insertion holes 3d and 3e is visually recognized through the ring cover 5. Even if it exists, it is the structure where an observer is hard to memorize discomfort.

  In the present embodiment, the surface on the chassis 2 side in the vicinity of the outer edge portion of the reflection sheet 3 is fixed to the chassis 2 with the double-sided tape 35. This eliminates the need to use a member that protrudes from the reflection surface of the reflection sheet 3, so that the luminance unevenness due to the member or the member is prevented from being visually recognized through the ring cover 5, and the outer edge of the reflection sheet 3. The part can be prevented from turning up from the chassis 2. In addition, in the vicinity of the outer edge portion of the reflection sheet 3, the influence of the heat generated in the light source unit 10 is small, and the amount of thermal deformation of the reflection sheet 3 is relatively small. However, undulation due to thermal deformation of the reflection sheet 3 hardly occurs.

  In this embodiment, since the reflection sheet 3 is attached to the surface of the chassis 2, after the reflection sheet 3 is attached to the chassis 2, another member (for example, the power supply cover 7 or the ring cover 5) is attached to the chassis 2. Can be prevented from entering between the reflection surface for reflecting the light emitted from the light source unit 10 and the ring cover 5 (for example, chips generated when screws are attached). Thereby, since the process of removing the dust which entered between the reflective surface and the ring cover 5 can be omitted, the manufacturing process can be simplified and the cost can be reduced. In the case of a configuration in which the surface of the chassis 2 is painted and used as a reflective surface without using a reflective sheet as in the comparative example described above, after the ring cover is attached, In order to remove the dust (such as chips generated when screws are attached), it was necessary to remove the ring cover once attached, clean the inside, and reattach the ring cover.

  In the present embodiment, the vicinity of the outer edge portion of the reflection sheet 3 is fixed to the chassis 2 by the double-sided tape 35, but is not limited thereto. For example, the outer edge of the reflection sheet 3 may be fixed to the outer edge of the chassis 2 by sandwiching the outer edge of the reflection sheet 3 and the outer edge of the chassis 2 with a fastener. Further, as the fastener, for example, a sealing member for preventing insects and dust from entering the ring cover 5 (the space between the chassis 3 and the ring cover 5 is shielded from the outside of the lighting device 1. It is also possible to use one that also functions as a shielding member). FIG. 20A to FIG. 20C are explanatory views showing the configuration and attachment method of the fastener 37 when the fastener 37 having such a function is used.

  As shown in FIG. 20A, the fastener 37 is an annular member having a shape corresponding to a circle formed by the outer edges of the chassis 2 and the reflection sheet 3, and is made of, for example, elastic rubber or resin. Further, as shown in FIG. 20B, the fastener 37 has a substantially S-shaped cross-sectional shape having a first groove portion 37a that opens radially inward and a second groove portion that opens radially outward. doing. In addition, the inner diameter of the deepest part of the 1st groove part 37a is set substantially the same as the outer diameter of the chassis 2 and the reflective sheet 3 (633.4 mm in this embodiment). Moreover, in this embodiment, the width | variety of the radial direction of the fastener 37 in the state before mounting | wearing with the fastener 37 to the illuminating device 1 is 6 mm, and a perpendicular | vertical direction (the chassis 2 and the reflective sheet 3 are provided). The width in the direction perpendicular to the surface is 5 mm.

  When attaching the fastener 37, first, as shown in FIG.20 (c), the chassis 2 and the perimeter of the reflective sheet 3 are inserted | pinched in the 1st groove part 37a of the fastener 37 first. At this time, the second groove 37b side of the fastener 37 is arranged on the opposite side of the chassis 2 from the side where the reflection sheet 3 is arranged. Thereafter, the outer edge of the ring cover 5 is attached to the side of the chassis 2 opposite to the side where the reflection sheet 3 is disposed. As shown in FIG. 20C, the outer edge portion of the ring cover 5 has a substantially U-shaped cross section in which the tip portion is folded back to the inner diameter side of the lighting device 1. And the front-end | tip part of this ring cover 5 is made to contact | abut to the surface on the opposite side to the side in which the reflective sheet 3 is arrange | positioned in the fastener 37, and a fastener is made in the direction which reduces the width | variety of the 2nd groove part 37b of the fastener 37. The ring cover 5 is attached to the chassis 2 so as to press 37. A part of the ring cover 5 may be attached to the chassis 2 with screws or the like. Thus, the ring cover 5 and the chassis 2 are sealed with the fasteners 37 to prevent insects and dust from entering the ring cover 5 and the outer edge of the reflection sheet 3 is attached to the outer edge of the chassis 2. be able to.

(1-5. Configuration of partition unit 4)
Next, the configuration of the partition unit (reflecting member) 4 will be described. FIG. 21 is an explanatory diagram showing the configuration of the partition unit 4 and the nightlight light source unit (first light source, light source) 101 and the reflector 102 before being attached to the partition unit 4. FIG. 22 is a perspective view, a top view, a side view, and a bottom view of the partition unit 4. Hereinafter, the unit in which the nightlight light source unit 101 and the reflector 102 are attached to the partition unit 4 is referred to as a sub-illumination unit 100.

  As shown in FIGS. 21 and 22, the partition unit 4 is provided with a light source storage portion 103 that stores the nightlight light source unit 101. The light source storage unit 103 includes a light passage port (passage unit) 103-1 that opens toward the center of the partition unit 4 and allows light to pass through. The light of the light source unit 101 is emitted toward the peripheral portion of the partition unit 4 or toward the central portion from the peripheral portion. The partition unit 4 is provided with four light source storage portions 103, and the light source storage portions 103 are arranged at substantially equal intervals along the periphery of the circular opening provided in the partition unit 4. Yes.

  Of course, the number of the light source storage units 103 is not limited to four. As described above, the partition unit 4 includes the main illumination area (second light emitting surface) that is an area illuminated by the light emitted from the light source unit (second light source) 10 and the sub-light formed on the inner side of the main illumination area. The illumination area (first light emitting surface) is separated. The sub-illumination area is an area illuminated by light emitted from the nightlight light source unit 101 stored in the light source storage unit 103. The number of light source storage units 103, that is, the number of nightlight light source units 101, is determined according to the luminance required for the sub-illumination area, the uniformity of the luminance within the sub-illumination area, and the like. Therefore, the number of the light source storage units 103 may be four or more, or may be four or less. Further, the intervals between the light source storage units 103 are preferably the above-described substantially equal intervals from the viewpoint of uniformity of luminance in the sub-illumination area.

  As shown in FIGS. 21 and 22, the partition unit 4 is further provided with a cylindrical rib 104 and three holding claws 105 described later. The cylindrical rib 104 is provided with a bullet-shaped light source (not shown) resin-molded at its bottom, and guides light emitted from the bullet-shaped light source from the bottom toward the tip. Is. The three holding claws 105 include a ceiling-side mounting member provided on the ceiling by the adapter 9 through openings provided in the power supply cover 8, the power supply substrate 7, the chassis 2, the reflection sheet 3, and the partition unit 4. When the adapter 9 is attached, the power cable of the adapter 9 is held along the periphery of the adapter 9. The cylindrical rib 104 and the three holding claws 105 will be described later.

  The partition unit 4 can be integrally molded using, for example, a mold. The partition unit 4 may be molded by pouring resin or the like into a mold that defines the shape of the partition unit 4. Here, the partition unit 4 reflects the light emitted from the light passage port 103-1 of each light source storage unit 103 toward the center of the partition unit 4 on the inner surface (reflection surface) of itself. The center cover (cover) 6 faces the inner surface. Moreover, in each light source storage part 103, the light of the nightlight light source unit 101 is reflected by the inner surface of the shade part 103-2 and the inner surfaces of the two side wall parts 103-3 and directed toward the light passage port 103-1. It is something to make. Further, as described above, since each light source storage portion 103 is arranged at substantially equal intervals along the periphery of the circular opening provided in the partition unit 4, each light passage port 103-1 is provided in the partition unit 4. It can be said that they are arranged at substantially equal intervals along the periphery of the inner surface.

  Therefore, the resin or the like for molding the partition unit 4 has at least non-light-transmitting properties that do not transmit light. Furthermore, from the viewpoint of increasing the above-described reflection efficiency, it is preferable to have light reflectivity for reflecting light. From such a point, for example, uniform white polycarbonate can be used as the resin for molding the partition unit 4.

  As described above, the light passage port 103-1 of each light source storage unit 103 directs the light of the nightlight light source unit 101 stored by the light source storage unit 103 toward the peripheral part of the partition unit 4 or the central part side of the peripheral part. Exit. As a result, the light from the nightlight light source unit 101 is once reflected on the inner surface of the partition unit 4 and then irradiated to the center cover 6. This is because the center cover 6 is disposed to face the inner surface of the partition unit 4, and the light passage port 103-1 is disposed between the inner surface and the center cover 6.

  Such a light emission method, that is, a light distribution restriction method of the light passage port 103-1, is that the light passing through the light passage port 103-1 is directly irradiated on the center cover 6 described above. The purpose is to prevent. This is because if the light that has passed through the light passage port 103-1 is directly applied to the center cover 6, luminance unevenness occurs in the light emitted from the center cover 6 due to the directivity of the light.

(1-6. Configuration of Sub Illumination Unit 100)
FIG. 23 is a top view of the sub-illumination unit 100 in which the nightlight light source unit 101 and the reflector 102 are attached to the partition unit 4, and each of the GG cross section and the HH cross section shown in the top view.

  As shown in FIG. 23, the light source storage part 103 is surrounded by the shade part 103-2 and the two side wall parts 103-3, and is reflected by the light source accommodation part 103 from the opposite side to the shade part 103-2. A plate 102 is mounted. The shade portion 103-2, the two side wall portions 103-3, and the reflecting plate 102 form a storage space for storing the nightlight light source unit 101. The nightlight light source unit 101 is inserted into the storage space thus formed from the side opposite to the light passage port 103-1. From this insertion, it can be said that the night light source unit 101 is disposed on the peripheral side of the partition unit 4 (the inner surface thereof) as viewed from the light passage port 103-1.

  FIG. 24 is a front view of the night light source unit 101 (a plan view of the night light source unit 101 viewed from the light passage port 103-1) and a bottom view (a plane of the night light source unit 101 viewed from the reflector 102 side). FIG. 4B is a side view of the night light source unit 101 viewed from the side wall 103-3 side.

  As shown in FIG. 24, the nightlight source unit 101 includes a support substrate B101, a light source (LED) L101, a connector C101, and a connector C102. The support substrate B101 is mounted on the light source storage unit 103 so that the light source L101, the connector C101, and the connector C102 are disposed in the light source storage unit 103. In order to realize this mounting, the shape of the support substrate B101 is a shape that can be fitted into the light source storage portion 103 from the bottom surface side in FIG. The light can be emitted only from the light passage port 103-1 by covering with the reflecting plate 102 after being stored in the light source storage unit 103. In addition, the material of the support substrate B101 is not particularly limited, but generally, heat generated by the light source L101 via the support substrate B101 can be transferred to the partition unit 4 and dissipated. It is preferable to use a material having high thermal conductivity. In the present embodiment, the light source L101 is used as sub-illumination (that is, a nightlight), and therefore, the power input to the light source L101 is usually smaller than that in the case of main illumination. For this reason, since the emitted-heat amount from the light source L101 becomes small, you may use the material with low heat conductivity.

  Further, the support substrate B101 preferably has a non-light-transmitting property that does not transmit light so that the light from the light source L101 can be directed to the light passage port 103-1, and has a light-reflecting property that reflects light. More preferably.

  The light source L101 emits sub illumination light that is a night light. The color of the light emitted from the light source L101 and the type (number of colors) of the light source are appropriately changed according to the size and shape of the sub-illumination area of the lighting device 1 and the luminance required for the sub-illumination light emitted from the sub-illumination area. It is what is done. As the light source L101, low-power LEDs can be used as compared with the light source light sources L1 to L3 provided in the light source unit 10. The light source L101 uses, for example, a light bulb color LED, but the light color of the LED used for the light source L101 is not limited to the light bulb color, and other light color LEDs such as daylight color and blue color may be used.

  The connector C101 and the connector C102 are for connecting connection terminals of electrical wiring (electrical wiring for connecting to the power supply board 7) to the nightlight light source unit 101.

  The reflection plate 102 forms a storage space for storing the night light source unit 101 together with the shade portion 103-2 of the light source storage portion 103 and the two side wall portions 103-3. The reflection plate 102 is mounted on the light source storage portion 103 from the side opposite to the shade portion 103-2 of the light source storage portion 103. In other words, the reflection plate 102 constitutes the bottom (surface on the ceiling side) of the light source storage portion 103. Yes. The reflection plate 102 reflects the light of the nightlight light source unit 101 together with the inner surface of the shade portion 103-2 and the inner surfaces of the two side wall portions 103-3, and directs the light toward the light passage port 103-1. Therefore, it is preferable that the reflecting plate 102 has a non-light transmitting property that does not transmit light, and more preferably has a light reflecting property that reflects light. The reflective plate 102 preferably has a high reflectance, and the reflective plate 102 is preferably a reflective sheet having a reflectance of 99% or more in order to reduce the thickness of the lighting device 1. Moreover, the shape of the reflecting plate 102 is a shape that can be fitted into the light source housing 103 from the side opposite to the shade portion 103-2 of the light source housing 103.

(1-7. Function of Sub-lighting Unit 100)
25 and 26 are explanatory diagrams schematically showing the locus of light emitted from the light source L101. Specifically, in FIGS. 25 and 26, after the light emitted from the light source L101 is reflected in the light source storage portion 103 of the partition unit 4, the light passing port 103-1 is directed into the partition unit 4. The trajectory is shown. First, the light emitted from the light source L101 is reflected only by the shade portion 103-2, the two side wall portions 103-3, and the reflection plate 102 inside the light source storage portion 103, and only the light passing through the light passage port 103-1. Advances into the compartment unit 4.

  Here, the I part shown in FIG. 25 is the side of the cap 103-2 on the light passing port 103-1 side (the side on the cover side), and the shape of the cap 103-2 (particularly the side The shape) is defined as a concave shape that is recessed toward the inner surface side of the partition unit 4 so that light passing through the light passage port 103-1 is not directly irradiated onto the center cover 6. In other words, the shape of the cap portion 103-2 is such that the light passing through the light passage port 103-1 is once reflected on the inner surface of the partition unit 4 and then irradiated to the center cover 6 above. It is defined as a concave shape recessed on the inner surface side. In short, it is only necessary to satisfy the condition that a straight line connecting the light source L101 of the nightlight light source unit 101 and any point on the side of the light passage port 103-1 passes through the inner surface of the partition unit 4. In addition, it is more preferable that the straight line connecting the light source L101 and the arbitrary point on the side of the light passage port 103-1 passes through the peripheral edge of the partition unit 4 in order for the center cover 6 to emit light uniformly. In this case, the light passing through the light passage port 103-1 always reaches the inner surface of the partition unit 4 and is reflected. Of course, a straight line connecting the light source L101 and an arbitrary point included in the remaining side excluding the side of the light passage port 103-1 also needs to pass through the inner surface. However, if the above-mentioned condition is satisfied with respect to the above-mentioned side on the light passage port 103-1, the above-described condition is also satisfied with respect to the remaining side in the present embodiment.

  Specifically, as shown in the cross-sectional view of the GG cross section of FIG. 23, the shape of the shade portion 103-2 changes from the nightlight source unit 101 side to the light passage port 103-1 side as the ceiling side ( That is, it is inclined to the side opposite to the center cover 6 side. Due to this inclination, the light emitted from the light source L101 of the nightlight light source unit 101 is gradually converged on the ceiling side as it travels toward the light passage 103-1 while being reflected by the shade 103-2. . For this reason, the light passing through the light passage port 103-1 is not directly irradiated to the center cover 6, but is once reflected on the inner surface of the partition unit 4 and then irradiated to the center cover 6.

  Further, the shade portion 103-2 has a width direction (a direction orthogonal to the bottom surface (reflecting plate 102). A direction orthogonal to a direction from the nightlight light source unit 101 side to the light passage port 103-1 side (hereinafter referred to as “length”). The cross-sectional shape along the direction))) is concave. As shown in the cross-sectional view of the HH cross section of FIG. 23, the center along the length direction of the cap portion 103-2 is recessed on the ceiling side as compared with the two side wall portions 103-3 side. It has become. The reason for this shape is as follows.

  The light emitted from the light source L101 gradually spreads and passes through the light passage port 103-1. For example, among the light emitted from one light source storage unit 103, the light traveling toward the opposite light source storage unit 103 (referred to herein as “first light”) and the adjacent light source storage unit 103 side The light traveling toward the light (referred to herein as “second light”) looks up the peripheral portion of the partition unit 4 from the light source storage portion 103 for allowing the light to reach the vicinity of the peripheral portion of the partition unit 4. The angle (elevation angle) is different. Specifically, the latter is larger than the former. In addition, when the light emitted from the light source storage unit 103 travels to the center cover 6 side with respect to the peripheral portion of the partition unit 4, the center cover 6 is directly irradiated.

  The first light is reflected at the center along the length direction of the cap portion 103-2, and the second light is reflected at the two side wall portions 103-3 side of the cap portion 103-2. To do. For this reason, in order to make each of 1st light and 2nd light reach the vicinity of the peripheral part of the division unit 4, according to the angle which looks up the peripheral part of the division unit 4 from the light source storage part 103, the cap part 103 It is necessary to adjust the cross-sectional shape along the width direction of -2. Since the partition unit 4 has a circular shape, as shown in the cross-sectional view of the HH cross section of FIG. 23, the cross-sectional shape along the width direction of the cap portion 103-2 has two side wall portions 103 from the center. The concave shape is continuously inclined toward the -3 side.

  As shown in FIGS. 25 and 26, the light emitted from the light source storage unit 103 is reflected in the partition unit 4 and can reach the vicinity of the peripheral edge of the partition unit 4.

  FIG. 27 is an explanatory diagram showing the luminance distribution in the sub illumination area illuminated by the sub illumination unit 100. FIG. As shown in FIG. 27, the luminance distribution in the sub illumination area is made uniform.

  As described above, the sub-illumination unit 100 temporarily irradiates the inner surface of the partition unit 4 without directly irradiating the center cover 6 with the light emitted from the nightlight light source unit 101 using the light source storage portion 103 of the partition unit 4. After the reflection, the center cover 6 can be irradiated. Thereby, the light emitted from each light source storage unit 103 is made uniform in the partition unit 4, and the luminance of the sub illumination area can be made uniform. Further, it is not necessary to increase the distance between the light emitted from the nightlight light source unit 101 and the center cover 6. Thereby, thickness reduction of the illuminating device 1 can be achieved.

  The partition unit 4 is not limited to a circular shape, and may be a rectangular shape as shown in FIG. 28, for example. FIG. 28 is a top view of the sub-illumination unit 100a in which the nightlight light source unit 101 and the reflector 102 are attached to the rectangular partition unit 4a, and each of the JJ cross section and the KK cross section shown in the top view. It is.

  The difference between the partition unit 4a and the partition unit 4 is that the shape of the shade portion 103-2a of the light source storage portion 103a and the shape of the shade portion 103-2 of the light source storage portion 103 are different. The partition unit 4a has a rectangular shape. Therefore, the peripheral portion of the partition unit 4a is not an arc like the peripheral portion of the partition unit 4, but is a straight line. For this reason, the angle (elevation angle) for looking up the partition unit 4a from the light source storage portion 103a does not change continuously unlike the circular partition unit 4. This is because, in the case of a rectangular shape, the elevation angle changes greatly from one side across one vertex to the other side, with that vertex as a boundary.

  For this reason, as shown in the cross-sectional view of the KK cross section of FIG. 28, the cross-sectional shape along the width direction of the cap portion 103-2a of the light source storage portion 103a is the same as the cap portion 103-2 of the light source storage portion 103. Similarly, although it becomes a concave shape recessed on the ceiling side, it has a concave shape having a vertex at the center along the length direction of the shade portion 103-2a.

  Furthermore, as described above, the peripheral portion of the partition unit 4a is not an arc like the peripheral portion of the partition unit 4, but is a straight line. For this reason, the cross-sectional shape along the width direction of the shade portion 103-2a of the light source storage portion 103a changes to a linear shape.

  Of course, the shape of the partition unit 4 can be various shapes other than the rectangular shape like the partition unit 4a. The shape of the shade portion 103-2 of the light source storage portion 103 may be appropriately adjusted according to the shape of the partition unit 4. In short, the emitted light of each light source storage portion 103 of the partition unit 4 reaches the vicinity of the periphery of the partition unit 4 and does not directly irradiate the center cover 6 on the ceiling side of the periphery of the partition unit 4. In addition, the shape of the shade portion 103-2 of the light source storage portion 103 may be adjusted as appropriate.

(1-8. Function of holding claw portion 105 of partition unit 4)
Next, the function of the holding claw part (holding part) 105 of the partition unit 4 will be described. FIG. 29 is a perspective view showing the overall configuration of the lighting device 1 and an enlarged view of the L portion shown in the perspective view. FIG. 30 is a top view of the partition unit 4 and a cross-sectional view of the MM cross section shown in the top view. FIG. 31 is a top view of the ring cover 5 and the center cover 6, a cross-sectional view of the NN cross section shown in the top view, and an enlarged view of the O portion shown in the cross-sectional view.

  As shown in FIGS. 29 to 31, the partition unit 4 is provided with three holding claws 105. As described above, these three holding claws 105 are provided on the ceiling with the adapter 9 through the openings provided in the power supply cover 8, the power supply board 7, the chassis 2, the reflection sheet 3, and the partition unit 4. The power cable 107 of the adapter 9 is held along the periphery of the adapter 9 when attached to the ceiling-side mounting member (so-called hook ceiling or hook rosette).

  The arrangement of the power cable 107 of the adapter 9 is important. Normally, the power cable 107 is disposed between the inner surface (reflection surface) inside the partition unit 4 and the center cover (cover) 6 facing the inner surface. In other words, it can be said that the power cable 107 is disposed in a space formed between the inner surface of the partition unit 4 and the center cover 6.

  Since the position of the sub-illumination area and the adapter 9 overlap, when the power cable 107 of the adapter 9 is arranged at a position that blocks the light emitted from the light source storage unit 103, a shadow is generated by the power cable 107, and the lighting device 1 This is because the appearance is impaired.

  In consideration of the convenience of the user when connecting the adapter 9 to the opening provided in the power supply cover 8, the power supply board 7, etc., it is usual to make the power cable 107 with a certain margin. This is because in order to insert the power connector 106 at the tip of the power cable 107 into the connecting portion 108 provided on the power supply board 7, it is necessary to move the power cable 107 to some extent.

  Therefore, in order to improve the appearance of the sub-illumination area, it is not possible to devise a method for housing the power cable 107 so that the power cable 107 is disposed at a position where the light emitted from the light source housing portion 103 is not blocked. Required.

  Specifically, as shown in FIG. 30, the movable portion 9a of the adapter 9 is connected to the first hooking member 9b or the second hooking member 9c as the adapter mounting portion according to the height of the above-described ceiling side mounting member. The lighting device 1 is hooked and fixed to the ceiling side mounting member. For example, if the ceiling side mounting member is high, the movable portion 9a of the adapter 9 is hooked on the first hooking member 9b. On the other hand, if the ceiling side attachment member is low, the movable portion 9a of the adapter 9 (corresponding to the adapter 9 'in the figure) is hooked on the second hooking member 9c.

  In this way, the adapter 9 is mounted in the opening of the partition unit 4, and as shown in FIG. 31, the power cable 107 led out from the adapter 9 is attached to the power supply board 7 using the power connector 106 at the tip. It is inserted into the provided connection part 108.

  In the present embodiment, the partition unit 4 is provided with three holding claws 105, and the holding cables 105 are used to hold the power cable 107 arranged as described above around the adapter 9 along the periphery. .

  As shown in FIG. 29, the three holding claws 105 are located closer to the ceiling than the light passage port 103-1 of the light source housing 103. Due to the three holding claws 105, the power cable 107 is located closer to the partition unit 4 than the light passage port 103-1 (that is, the nightlight light source unit 101) of the light source storage unit 103 in the direction perpendicular to the center cover 6. It is hold | maintained so that it may be located in an internal inner surface side. That is, it is not arranged at a position that blocks light passing through the light passage port 103-1. For this reason, the power cable 107 held while being wound around the periphery of the adapter 9 using the three holding claws 105 can be surely excluded from the position where the light emitted from the light source housing 103 is blocked. .

  The holding claw portion 105 is provided around the opening of the partition unit 4. Usually, the opening of the partition unit 4 is a large opening compared to the size of the adapter 9 in consideration of convenience when the user inserts the adapter 9 into the opening of the partition unit 4. As described above, when the user inserts the adapter 9 into the opening of the partition unit 4, the user must press the movable portion 9 a of the adapter 9 inward in the diametrical direction while abutting the movable portion 9 a on the inner edge of the partition unit 4. For this reason, a gap space for ensuring the movable range of the movable portion 9 a is required between the opening and the adapter 9.

  In the present embodiment, the holding claw portion 105 is provided around the opening of the partition unit 4 in order to effectively use the gap space. Accordingly, the power cable 107 of the adapter 9 can be arranged along the periphery of the adapter 9 while being pushed into the gap space.

  In this way, the power cable 107 of the adapter 9 can be excluded from the position where the light emitted from the light source storage unit 103 is blocked, so that it is possible to prevent the power cable 107 from being shaded in the sub illumination area. . Thereby, it can avoid impairing the appearance of the sub-illumination area.

  Further, since the power cable 107 can be disposed along the periphery of the adapter 9 using the gap space between the partition unit 4 and the adapter 9, it is necessary to prepare a space for storing the power cable 107 separately. Nor. Therefore, the partition unit 4 is not increased in size, and hence the illumination device 1 is not increased in size.

  Note that the number of the holding claw portions 105 is not limited to three. By providing the holding claws 105 at a plurality of locations around the opening of the partition unit 4, the adapter 9 is mounted on the opening of the partition unit 4 regardless of the position (orientation) of the main body of the lighting device 1 with respect to the adapter 9. It becomes easy for the holding claw portion 105 to come near the connection position between the adapter 9 and the power cable 107. This leads to facilitating the operation of hooking the power cable 107 on the holding claw portion 105, and the power cable 107 can be shortened accordingly. Thereby, the shortening of the power cable 107 can reduce the chance that the power cable 107 blocks the light emitted from the light source storage unit 103.

(1-9. Function of the cylindrical rib 104 of the partition unit 4)
Next, the function of the cylindrical rib 104 of the partition unit 4 will be described. FIG. 30 is a top view of the partition unit 4 and a cross-sectional view of the MM cross section shown in the top view. FIG. 31 is a top view of the ring cover 5 and the center cover 6, a cross-sectional view of the NN cross section shown in the top view, and an enlarged view of the O portion shown in the cross-sectional view.

  As shown in FIG. 30, the cylindrical rib 104 has a bullet-shaped light source L102 that is resin-molded at the bottom thereof. The bullet-type light source L102 is a so-called indicator for indicating to the user whether or not various modes preset in the illumination device 1 are operating.

  Such an indicator usually uses green light with high visibility by the user, and the bullet-type light source L102 can use, for example, a green LED.

  By the way, when such an indicator is provided in the partition unit 4 of the present embodiment, the light emitted from the indicator is mixed with the light radiated from the partition unit 4 to the floor side as sub-illumination light. Function may be lost.

  In order to improve the visibility of the indicator, it can be considered that the bullet light source L102 is brought close to the center cover 6. However, in that case, the parts attached to the bullet light source L102 (for example, the board B102 that supports the bullet light source L102 and the electric wire led out from the board B102) block the light emitted from the light source storage unit 103, and thereby the bullet Shadows due to the light source L102 and its components are generated, and the appearance of the sub-illumination area is impaired.

  In the present embodiment, the partition unit 4 is provided with a cylindrical rib 104, and the bullet-type light source L <b> 102 is disposed at the bottom of the cylindrical rib 104. Since the cylindrical rib 104 is integrally formed with the partition unit 4, it has at least non-light transmission, preferably light reflection.

  Therefore, the light emitted from the bullet-type light source L102 disposed at the bottom of the cylindrical rib 104 travels toward the tip on the center cover 6 side while being reflected inside the cylindrical rib 104. As a result, the light emitted from the bullet-type light source L102 is condensed until it reaches the vicinity of the center cover 6, so that the user can output the bullet-type light source L102 even in the sub illumination light of the partition unit 4. The incident light can be visually recognized.

  The presence of the cylindrical rib 104 is generally a hindrance to the uniform emission of the sub-illumination light, and is therefore a factor that reduces the uniformity of the light. Therefore, it is important to define the height of the cylindrical rib 104 so that the uniformity of the sub-illumination light is not hindered and the visibility of the bullet-type light source L102 can be ensured.

  The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope shown in the claims. That is, embodiments obtained by combining technical means appropriately modified within the scope of the claims are also included in the technical scope of the present invention.

  The present invention can be applied to a lighting device including a light source formed on a substrate and a lens that refracts light emitted from the light source.

1 Lighting device 2 Chassis (top surface)
2a Groove 2b Groove 3 Reflective sheet (top surface)
3a Slit 3b, 3c Notch 3d, 3e Insertion hole 3f Insertion hole 3g End part 4 Compartment unit 5 Ring cover 6 Center cover 6a Disc part 6b Shading part 6c Hole part 7 Power supply board 8 Power supply cover 9 Adapter 9a Movable part 10 Light source Unit (second light source, light source)
11 Lens 11a-11c Light incident surface 11d, 11e Total reflection surface 11f-11h Light output surface 11s Opposing surface 12 Substrate 12a Substrate body 12a, 12b Insertion hole (engaging recess)
12b Elastic sheet (sheet-like member)
12c Insertion hole (first insertion hole)
12d Insertion hole (second insertion hole)
13a-13d Engagement claw part (engagement part)
13e Protruding part (first projecting part)
13f Protruding part (second projecting part)
14a-14d, 14g rib (first rib member)
14e, 14f rib (second rib member)
20 Angle part (support part)
21 standing part 22 tip part (bottom part)
23a-23d engagement hole (engaged part)
23e, 23f Insertion holes 24a, 24b Insertion hole 25 Opening (through hole)
26 Notch portions 31a, 31b Mounting clip 32 Head 33 Inserted portion 34 Slit portion 35 Double-sided tape 36 Screw 37 Fastener 37a First groove portion 37b Second groove portions C1, C2 Connector L1 Light source (white light source)
L2 light source (light bulb color light source)
L3 light source (red light source)
t1, t2 Electrical wiring connection terminal 100 Sub-lighting unit 101 Nightlight light source unit (first light source, light source)
102 Reflecting plate 103 Light source storage portion 104 Cylindrical rib 105 Holding claw portion (holding portion)
106 power connector 107 power cable 108 connection portion 103-1 light passage (passage portion)
103-2 Shade part 103-3 Side wall part L101 Light source B101 Support substrate C101, C102 Connector

Claims (6)

A plurality of light source units, a chassis made of plate-like members, and a central portion of the chassis, the light source units are held so that light from each of the light source units is emitted toward the outer edge side of the chassis. A lighting device comprising a plurality of light source holding parts,
Each of the light source holding portions is formed integrally with the chassis by bending a part of a plate-like member constituting the chassis, and is disposed independently of each other at a central portion of the chassis. A lighting device.   The plurality of light source holding portions have a plurality of cutout portions that are notched from the periphery of the through-hole formed in the central portion of the plate-shaped member to the outer edge side of the plate-shaped member along the periphery of the through-hole. 2. The lighting device according to claim 1, wherein the lighting device is formed by bending a part of the plate-like member provided at intervals and sandwiched between the adjacent notch portions. The light source holding part includes a standing part obtained by bending a part of a plate member constituting the chassis with respect to the main surface of the chassis, and an end part of the standing part opposite to the main surface. Having a tip bent in a direction opposite to the surface,
The lighting device according to claim 1, wherein the light source unit is held by sandwiching the light source unit between the main surface and the tip portion. The light source unit includes one of an engaging portion and an engaged portion on a surface facing the main surface and a surface facing the tip.
The light source holding part includes the other of the engaging part and the engaged part on the main surface and the tip part,
The lighting device according to claim 3, wherein the light source unit is held by the light source holding part by engaging the engaging part and the engaged part. The light source unit includes a substrate provided with a light source, and a lens disposed opposite to the light source,
Of the engaging portion and the engaged portion, the one provided in the light source unit is provided in the lens.
The substrate includes an elastic sheet made of an elastic body having thermal conductivity on a surface opposite to a surface facing the lens.
In the state where the engaging portion and the engaged portion are engaged, the substrate has the elastic sheet in contact with the standing portion, and at least a part of the substrate is at least one with respect to the lens. The lighting device according to claim 4, wherein the lighting device is relatively movable in a direction. The main surface of the chassis consists of a reflective surface that reflects light,
Covering the main surface so that the light source unit is disposed between the main surface of the chassis, comprising a cover member having light transmittance,
The lighting device according to any one of claims 3 to 5, wherein an angle between the standing portion and the main surface of the chassis is smaller than 90 degrees.