JP6944704B2 - LED lighting device - Google Patents

Description

The present invention relates to an LED lighting device including an LED element as a light source.

As LED lighting devices, there are high-brightness lighting devices that are used indoors in large stores, warehouses, factories, etc., or outdoors to illuminate buildings and objects.
For example, the LED lamp described in Patent Document 1 is provided with a substrate on which a light emitting element is mounted, a light source holding portion for mounting and holding the substrate on the front surface, and a base extending from the back surface of the light source holding portion at the end. A flange portion provided in the light source holding portion with a through hole for penetrating the front and back, the tubular portion is inserted into the through hole, and the tubular portion is provided at the edge of the through hole. Is fixed, the central portion of the surface of the light source holding portion is recessed, a recess is provided integrally with the light source holding portion, and the through hole is provided at the bottom of the recess.
Here, since the high-luminance LED lamp generates a large amount of heat, the heat dissipation structure for heat dissipation becomes heavy. Since the heat dissipation structure is generally provided by being connected to the light source holding portion, a load is applied to the fixed portion between the light source holding portion and the cylindrical portion. However, according to the above structure, the light source holding portion and the tubular portion are separated. Can be firmly fixed.

Japanese Patent No. 6167744

In the LED lamp of Patent Document 1, the surface of the light source holding portion is recessed to provide a recess, but in order to form such a recess, a flat metal plate is generally recessed by drawing. Is. However, in the process of drawing, the light source holding portion may be warped or distorted, resulting in poor contact between the LED substrate and the light source holding portion. Therefore, there is a problem that the heat generated from the light emitting element cannot be sufficiently transmitted to the light source holding portion, and the heat dissipation efficiency is lowered.
An object of the present invention is to provide an LED lighting device having high heat dissipation efficiency while firmly fixing a light source holding portion and a cylindrical portion.

The LED lighting device according to the present invention includes an LED module in which a plurality of LED elements are mounted on a substrate, a translucent cover that covers the LED module, a cylinder with a base having a base at one end, and the LED. In addition to the flat metal base plate on which the module and the translucent cover are mounted on the front side and the cylinder with a base is mounted on the back side, and the cylinder on the front side of the metal base plate and the base with a base. It is characterized by including a connecting body for fixing the end to the metal base plate.

According to the above configuration, since the metal base plate is flat, the contact area with the LED substrate can be increased and the heat dissipation efficiency can be improved. Further, since the drawing process for forming the concave portion is not required, the metal base plate is not warped or distorted, and the adhesion rate between the metal base plate and the LED substrate is increased. As a result, the heat dissipation efficiency can be further increased. Further, according to the above configuration, the metal base plate and the cylinder with a base can be firmly fixed by using the connecting body.

(A) is a perspective view of the LED lighting device viewed from the front side, and (b) is a perspective view of the LED lighting device viewed from the back side. It is a perspective view which looked at the disassembled LED lighting apparatus from the front side. It is a perspective view which looked at the disassembled LED lighting apparatus from the back side. (A) It is an enlarged view of the front side of a heat sink. (B) It is an enlarged view of the back side of a heat sink. It is a perspective view which looked at the connected body from the front side. It is a perspective view which looked at the cylinder with a mouthpiece from the front side. It is a figure for demonstrating the connection between a cylinder with a mouthpiece and a connecting body. It is a figure for demonstrating the fixing structure of a heat sink by a cylinder with a mouthpiece and a connecting body. It is a perspective view of the LED lighting device with the translucent cover removed. It is a partial cross-sectional view of an LED lighting device.

<Overview>
The LED lighting device according to one embodiment includes an LED module in which a plurality of LED elements are mounted on a substrate, a translucent cover that covers the LED module, and a cylinder with a base having a base at one end. A flat metal base plate in which the LED module and the translucent cover are mounted on the front side and the cylinder with a base is mounted on the back side, and a cylinder arranged on the front side of the metal base plate and having a base. It is characterized by including a connecting body for fixing the other end of the body to the metal base plate.
Since the metal base plate is flat, the contact area with the LED substrate can be increased to improve heat dissipation efficiency. Further, since the drawing process for forming the concave portion is not required, the metal base plate is not warped, and the adhesion rate between the metal base plate and the LED substrate is increased. As a result, the heat dissipation efficiency can be further increased.

Further, when the metal base plate is provided with the recess, a product in which the LED substrate partially floats from the metal base plate may be manufactured. However, since it is no longer necessary to provide a recess, there is an effect that manufacturing becomes easier and the yield is increased.
In the LED lighting device according to another aspect of the embodiment, the tubular body with a mouthpiece has a flange portion extending outward in the radial direction at the other end, and the connecting body is in contact with the metal base plate. It has a contact portion, and is characterized in that a flat portion of the metal base plate is sandwiched between the flange portion of the tubular body with a mouthpiece and the contact portion of the connecting body.
As a result, the metal base plate and the cylinder with a base can be firmly fixed.

In the LED lighting device according to another aspect of the embodiment, the claw portion protruding from the flange portion of the tubular body with a mouthpiece is formed into a through hole provided in the metal base plate and the contact portion of the connecting body. It is characterized in that it is inserted into a provided locking hole and locked and fixed.
As a result, the metal base plate and the cylinder with the base can be more firmly fixed.
In the LED lighting device according to another aspect of the embodiment, the substrate of the LED module is a donut shape having a through hole formed in the center of a circular shape, and the connecting body is arranged in the through hole of the LED module. It is characterized by being.
As a result, the optimum LED module can be mounted on the flat metal base plate.
In the LED lighting device according to another aspect of the embodiment, the LED module has a plurality of substrates, and the donut shape is formed by the plurality of substrates.
As a result, the optimum LED module can be mounted on the flat metal base plate.

<Embodiment>
1. 1. Outline The LED lighting device (hereinafter, simply referred to as “lighting device”) 1 according to the embodiment is used indoors in a large store, warehouse, factory, etc. by being mounted on a socket (not shown), and has a so-called base. It is a high-intensity lamp.
As shown in FIGS. 1 to 3, the lighting device 1 includes a translucent cover 17, an LED module 13, a connecting body 14, a heat sink 15, a tubular body with a base 19, and a fin cover body 16. Each part will be described below.

2. Configuration of Each Part (1) Heat Sink The heat sink 15 will be described with reference to FIG. The heat sink 15 is composed of a metal base plate 151 and a plurality of fins 153. The metal base plate 151 and the fin 153 are formed by pressing a metal plate having a thickness of 5 [mm] or less. Therefore, the fin 153 can be said to be a sheet metal type fin. The material of the metal base plate 151 and the fins 153 is aluminum. However, the material of the metal base plate 151 and the fin 153 is not limited to aluminum, and an iron plate or a copper plate may be used. If an iron plate is used, it can be manufactured at a lower cost than aluminum. Further, when a copper plate is used, a heat sink having a higher thermal conductivity than aluminum can be manufactured.

(1-1) Metal base plate The metal base plate 151 has a flat circular shape corresponding to the shape of the LED substrate 133. The metal base plate 151 has a module support portion 151a on which the LED module 13 is mounted on the surface.
The metal base plate 151 has a module mounting portion 151j for mounting the LED module 13 on the module supporting portion 151a. The module mounting portion 151j allows the LED module 13 to be mounted on the module support portion 151a without providing a through hole in the metal plate constituting the metal base plate 151.

As an example, the module mounting portion 151j is formed of a metal rod-like body having a male screw on the outer peripheral surface. The module mounting portion 151j is fixed to the surface of the module supporting portion 151a by driving or welding, and is integrated with the metal plate constituting the metal base plate 151. As a result, the module mounting portion 151j becomes a screw portion provided on the surface of the metal plate (module support portion 151a).
A plurality of screw portions (9 in this case) are provided at an intermediate portion in the radial direction and a portion near the outer periphery of the circular metal base plate 151 at intervals in the circumferential direction. The module mounting portion 151j corresponds to the module mounting portions 133b and 133c of the LED module 13 (see FIG. 9). The threaded portion is inserted through the through hole or chip which is the module mounting portion 133b and 133c of the LED substrate 133, and is screwed with the nut body 139a (see FIG. 2) on the front side of the LED substrate 133.

The metal base plate 151 has a flat tubular body connecting portion 151b connected to the tubular body 19 with a base near the center thereof. Further, the tubular connecting portion 151b has one or a plurality (here, one) through holes 151c and one or a plurality (here, three) through holes 151d. A connecting body 14 is used for connecting the tubular body 19 with a base, and the tubular body connecting portion 151b is sandwiched between the tubular body 19 with a base and the connecting body 14.
Specifically, in a state where the tubular body 19 with a base is in contact with the back surface of the metal base plate 151, the extension piece 193e of the tubular body 19 with a base extending outward from the through hole 151d of the metal base plate 151 (see FIG. 6). ) Engage with the engaging portion 143b (see FIG. 5) of the connecting body 14 that abuts on the surface of the metal base plate 151. The extension piece 193e of the tubular body 19 with a base passes through the through hole 151d in a state where the tubular body connecting portion 151b is in contact with the tubular body 19 with a base on the back surface and is in contact with the connecting body 14 on the front surface. Further, a fixed body 139b is used to fix the engaged state between the tubular body 19 with a base and the connecting body 14. The fixed body 139b is screwed into the screw hole 193d of the tubular body 19 with a mouthpiece shown in FIG. 6 by inserting the through hole 145 of the connecting body 14 and the through hole 151c of the metal base plate 151 from the front side.
Further, the metal base plate 151 has an opening 151e in the center. The opening 151e is a hole for passing an electric cable connected to the base 195 side. The peripheral edge of the opening 151e has an inner flange portion extending from the inner peripheral edge of the metal base plate 151 in a direction parallel to the tubular axial direction of the tubular body 19 with a base. Here, the inner collar extends to the back side. As a result, the end faces forming the opening 151e of the metal base plate 151 are easily exposed, and the safety of the connection work between the LED module 13 and the circuit side is improved. The opening diameter of the opening 151e is smaller than the outer diameter of the tubular body 191 described later.

The metal base plate 151 has a cover mounting portion 151f for mounting the translucent cover 17. The cover mounting portion 151f allows the translucent cover 17 to be mounted without providing a through hole in the metal plate constituting the metal base plate 151.
As an example, the cover mounting portion 151f is formed of a screw hole or a metal cylinder having a screw hole. Here, a metal cylinder having a female screw on the inner peripheral surface is used. The cover mounting portion 151f is fixed to the metal plate constituting the metal base plate 151 by driving or welding to be integrated with the metal plate. As a result, the cover mounting portion 151f becomes a boss and a screw hole provided on the surface of the metal plate. A plurality of cover mounting portions 151f (here, six) are provided at a portion close to the outer peripheral edge of the metal base plate 151 at equal intervals in the circumferential direction. A screw body 139c with a washer is screwed into the screw hole of the cover mounting portion 151f.

The outer peripheral edge of the metal base plate 151 is a front collar portion 151k extending to the front side. The front flange portion 151k has a function as a rib for mechanically strengthening the metal base plate 151. The inner peripheral surface of the front flange portion 151k is in contact with or close to the outer peripheral surface of the translucent cover 17.
The metal base plate 151 has a plurality of elongated groove portions 151i extending from the center of the module support portion 151a toward the outer periphery. The plurality of groove portions 151i are formed radially at equal intervals in the circumferential direction. As a result, the metal base plate 151 is reinforced.
As described above, the metal base plate 151 of the lighting device 1 has a flat plate shape. Compared with the conventional metal base plate having a recess, the flat metal base plate 151 has an increased contact area with the LED module 13, so that the heat dissipation efficiency is improved. Further, since the drawing process for forming the concave portion is not required, the metal base plate 151 is less likely to be warped. As a result, the adhesion rate between the metal base plate 151 and the LED module 13 is increased, and the heat dissipation efficiency is further increased.

(1-2) Fins Fins 153 are formed by pressing a metal plate into, for example, a "U" shape. The fin 153 has a pair of fin portions 153a and 153a extending to the back side and a connecting portion 153b connecting the front side ends of the pair of fin portions 153a and 153a. The connecting portion 153b here is connected in a state orthogonal to the pair of fin portions 153a and 153a.
The connecting portion 153b has an elongated equal leg base shape when viewed from the back side. A plurality of fins 153 are arranged radially at equal angles in the circumferential direction so that the short base is located on the center side of the metal base plate 151.
The connecting portion 153b has through holes 153c at a plurality of locations (here, two locations) spaced apart from each other in the radial direction of the metal base plate 151. The through hole 153c fits with the convex portion 151g of the metal base plate 151. The convex portion 151g protrudes to the back side, and the front side is slightly recessed.
The connecting portions 153b are fixed to the metal base plate 151 at a plurality of locations (here, two locations) spaced apart from each other in the radial direction of the metal base plate 151. Welding is used for fixing here. The metal base plate 151 and the connecting portion 153b may be fixed by soldering. In FIG. 4A, the welded portion of the metal base plate 151 is indicated by the reference numeral “151h”, and in FIG. 4B, the welded portion of the connecting portion 153b is indicated by the reference numeral “153d”. In the state where the connecting portion 153b is fixed to the metal base plate 151, the fin portion 153a is erected on the back side with respect to the metal base plate 151.

(2) Connection The connection 14 will be described with reference to FIG.
When connecting the heat sink 15 and the cylinder with a base 19, the connecting body 14 rotates relative to the heat sink 15 and the cylinder with a base 19 and engages with the extension piece 193e of the cylinder with a base 19. do. Therefore, the connecting body 14 has a rotatable shape and, for example, a circular shape when viewed from the front side. Here, it has an annular shape with an opening 141a in the center.
The connecting body 14 has a plate-shaped annular portion 141. The back surface side of the annulus 141 is a flush surface, and is a contact portion that abuts on the metal base plate 151. The connecting body 14 has a through hole 143a, an engaging portion 143b, and a stopper portion 143c for connecting to the tubular body 19 with a mouthpiece in the annular portion 141. There are a plurality of through holes 143a, engaging portions 143b, and stopper portions 143c (three in this case) at intervals in the circumferential direction.

The through hole 143a has a receiving port 143d that allows the extension piece 193e (see FIG. 6) of the tubular body 19 with a mouthpiece to pass through, and a rotation hole 143e that allows the relative rotation of the extension piece 193e. The shape of the receiving port 143d seen from the front side is, for example, the same triangular shape as the laterally stretched portion 193 g of the stretched piece 193e (see FIG. 7). The shape of the rotary hole 143e seen from the front side is, for example, the same arc shape as the vertically stretched portion 193f of the stretched piece 193e (see FIG. 7).
The engaging portion 143b projects in a streak shape on the front side so that the laterally stretched portion 193g of the stretched piece 193e that has rotated relative to the rotation hole 143e can engage. That is, since there is a gap between the surface of the annular portion 141 and the laterally stretched portion 193 g, the engaging portion 143b projects to the front side so that the stretched piece 193e can engage. The engaging portion 143b is provided inside the rotation hole 143e in an arc shape along the rotation hole 143e. The receiving port 143d side of the engaging portion 143b is an inclined surface in which the amount of protrusion increases as the distance from the receiving port 143d increases. As a result, the coupling body 14 can be smoothly rotated.

The stopper portion 143c regulates that the connecting body 14 when connecting the tubular body 19 with the mouthpiece rotates beyond the engaging portion 143b. The stopper portion 143c is provided so as to come into contact with the end portion of the laterally stretched portion 193g opposite to the receiving port 143d when the laterally stretched portion 193g of the tubular body 19 with a mouthpiece engages with the engaging portion 143b. .. The stopper portion 143c is composed of ribs that connect the inner flange portion 147a and the outer flange portion 147b, which will be described later, and extend to the front side. The stopper portion 143c also serves as a knob (grip portion) of the connecting body 14 when the connecting body 14 is manually rotated to engage with the tubular body 19 with a mouthpiece.
The connecting body 14 has a through hole 145 in the annular portion 141 that functions as a rotation stopping portion for stopping the rotational movement of the connecting body 14. As shown in FIG. 10, a screw body 139b, which is a fixed body, is used for the rotation stopper. A rotation stop portion is formed by inserting the screw body 139b into the through hole 145.

The connecting body 14 has an inner flange portion 147a extending from the inner peripheral edge of the annular portion 141 to the front side. Further, the connecting body 14 has an outer flange portion 147b extending from the outer peripheral edge of the annular portion 141 to the front side. The connector 14 has a circuit fixing portion 149 for fixing the circuit board 181 shown in FIG. The circuit fixing portion 149 is composed of two "U" pieces provided on the inner peripheral side of the annular portion 141. The "U" piece extends in the front and back directions, and the circuit board 181 is inserted into the groove of the "U" piece. The circuit board 181 is mounted with electronic components such as fuses and diodes for preventing the inrush current input to the LED module 13.

(3) Cylinder with clasp The cylinder with clasp 19 will be described with reference to FIGS. 1 to 3, 6 to 8 and 10.
As shown in FIGS. 1 to 3, the tubular body 19 with a base is composed of a cylindrical body 191 that is nearly cylindrical and a base 195 provided at one end thereof. The base 195 is an Edison type, specifically an E39 type. The other end of the cylinder 191 is mounted on the heat sink 15.
Here, the tubular body 191 will be mainly described. The tubular body 191 has a bottomed tubular shape with an elongated flange, and as shown in FIG. 6, a circuit board 181 in which electronic components for protecting the LED element 131 are arranged is housed therein. An electric cable 182 is connected to the circuit board 181 and a connector 183 is provided at the tip of the electric cable 182. This connector 183 is connected to the power receiving connector 135 of the LED module 13 described later.

The other end of the tubular body 191 has a flange portion 193 protruding outward. The collar portion 193 includes an outer collar portion 193a, a groove portion 193b, and an inner collar portion 193c.
The outer flange portion 193a and the inner flange portion 193c come into contact with the back surface of the metal base plate 151. The inner flange portion 193c has an extension piece 193e that engages with the engaging portion 143b of the connecting body 14. The stretched piece 193e corresponds to a claw portion projecting from the collar portion 193. There are a plurality of stretched pieces 193e (three in this case) at intervals in the circumferential direction. As shown in FIG. 6, the stretched piece 193e includes a longitudinally stretched portion 193f that stretches in a direction parallel to the central axis of the tubular body 191 and a transversely stretched portion 193g that stretches from the stretched tip of the longitudinally stretched portion 193f toward the central axis. And have.

FIG. 7 is a view of the state in which the tubular body 19 with a base is connected to the connecting body 14 as viewed from the front side of the lighting device 1. Here, all the configurations other than the connecting body 14 and the tubular body 19 with the base are omitted. As shown in FIG. 7, when the stretched piece 193e is viewed from the front side, the stretched piece 193e has a triangular shape. The triangle here is a right-angled triangle, and the right-angled portion is at the extension tip (center axis side). The side facing the right-angled portion has an arc shape. As shown in FIG. 10, the stretching amount of the vertically stretched portion 193f is such that when the front end of the outer flange portion 193a and the inner flange portion 193c abuts on the back surface of the metal base plate 151, the through hole 151d of the metal base plate 151 The amount is such that the extension piece 193e can insert the drawing piece 193e and the receiving port 143d of the connecting body 14 and engage with the engaging portion 143b around the through hole 143a of the connecting body 14.

A groove portion 193b for inserting the packing 12b shown in FIG. 10 is provided between the outer flange portion 193a and the inner flange portion 193c. When viewed from the front side, the groove portion 193b has a circular shape centered on the central axis of the tubular body 191. As shown in FIG. 10, the packing 12b is for ensuring airtightness between the tubular body 191 and the metal base plate 151 of the heat sink 15. The depth of the groove portion 193b is smaller than the thickness of the packing 12b on which no load is applied.
Further, the inner flange portion 193c has a screw hole 193d. The screw hole 193d is for a screw body 139b for fixing the connecting body 14.
FIG. 8 is a diagram showing a state in which the metal base plate 15 of the heat sink 15 is fixed by the connecting body 14 and the tubular body 19 with a base. Here, all the configurations other than the connecting body 14, the heat sink 15, and the tubular body 19 with the base are omitted. As shown in FIG. 8, the stretched piece 193e (claw portion) projecting from the flange portion 193 of the tubular body 19 with a mouthpiece is penetrated through the through hole 151d provided in the metal base plate 15 and the connecting body 14. It is inserted into the hole 143a (locking hole) to lock and fix it. Further, as shown in FIG. 10, the connecting body 14 is in a state where the back surface of the annular portion 141 is in contact with the metal base plate 151, and the tubular body 19 with a mouthpiece is the outer flange portion 193a and the inner flange portion 193c. Holds the metal base plate 151 in a state of being in contact with the metal base plate 151.
As a result, the metal base plate 151 and the tubular body 19 with a base can be firmly fixed.

Further, the tubular body 191 has rib portions 196, and as shown in FIGS. 2 and 3, a plurality of rib portions 196 are spaced apart in the circumferential direction (here, there are six). Further, the tubular body 191 has a cover body mounting portion 197 for mounting the fin cover body 16 (see FIG. 6). When the fin cover body 16 is attached to the tubular body 191, the fixed body 139d shown in FIGS. 2 and 3 is used. The fixed body 139d is a screw body, and is inserted into a screw hole provided on the back side of the cover body mounting portion 197. It should be noted that there are three cover body mounting portions 197 at intervals in the circumferential direction, and the cover body mounting portions 197 are provided on the rib portions 196, which are skipped by one with respect to the six rib portions 196. If the outer flange portion 193a is deformed in the axial direction of the tubular portion 191, the metal base plate 151 is fixed in a state of being tilted from the direction orthogonal to the axial direction of the tubular portion 191. Therefore, the rib portion 196 supports the outer collar portion 193a from the back side to prevent the outer collar portion 193a from being deformed.

(4) LED Module The LED module 13 will be described mainly with reference to FIG.
The LED module 13 is composed of a plurality of LED elements 131 and an LED substrate 133 on which the plurality of LED elements 131 are mounted.
The LED element 131 is a so-called "Middle Power" type in which the power consumption of one LED element 131 at the time of rated lighting is set to 0.1 [W] or more and 1 [W] or less. The power consumption of one LED element 131 here is 0.2 [W].

By using the Middle Power type having high luminous efficiency as the LED element 131, it is possible to suppress the amount of heat generated by the entire LED element 131. Further, by setting the power consumption of each LED element 131 to 0.1 [W] or more and 1 [W] or less, the amount of heat generated can be reduced, and the LED element 131 can be mounted on the LED substrate 133 at a high density. Further, by suppressing the amount of heat generated by each LED element 131, so-called sheet metal fins formed by press-molding a thin metal plate can be used. For example, when using the so-called High Power type whose power consumption per unit is larger than 1 [W], a thick-walled material in which a support member for mounting an LED module and fins are integrated with a material having excellent thermal conductivity. It is necessary to use a heat sink (aluminum die cast product). However, in the present embodiment, this is not necessary, and the weight can be significantly reduced.

The LED substrate 133 is a donut shape in which a through hole 133a is formed in the center of a circular shape. The through hole 133a is a hole for passing the electric cable 182 connected to the base 195 side. Further, the LED module 13 has a connector 135 for receiving power (see FIG. 3). The connector 135 is detachably connected to the connector 183 on the power supply side shown in FIG.
The LED substrate 133 has module mounting portions 133b and 133c for mounting on the metal base plate 151 of the heat sink 15. For mounting here, a screw body (a module mounting portion 151j) extending from the heat sink 15 and a nut body 139a are used. The module mounting portion 133b is composed of through holes, is an intermediate portion in the radial direction of the donut-shaped LED substrate 133, and has a plurality of modules (three in this case) at intervals in the circumferential direction. The module mounting portions 133c are formed by chips, and are the outer peripheral edges of the circular LED substrate 133, and a plurality of module mounting portions 133c (here, six) are spaced apart in the circumferential direction. The chip extends from the outer periphery toward the center. The module mounting portion 133c may be configured by a through hole.
Although a donut-shaped LED substrate 133 having a through hole 133a formed in the center is illustrated here, the LED substrate used in the present invention is not limited to this. For example, although not shown, a plurality of LED substrates may be arranged in a donut shape so as to surround the opening 151e of the metal base plate 151.

(5) Translucent cover The translucent cover 17 will be described with reference to FIGS. 2 and 3.
The translucent cover 17 is made of a translucent resin material. For example, polycarbonate is used as the resin material, but other resins may be used. The translucent cover 17 has an annular portion 171 located on the outer peripheral side of the LED module 13 and a covering portion 173 that covers the LED module 13.
The annular portion 171 has an external shape corresponding to the outer shape of the LED substrate 133. Here, since the LED substrate 133 has a circular shape, the annular portion 171 has an annular shape.
The annular portion 171 has a plurality of arcuate flat portions arranged in the circumferential direction, and a recessed portion provided between the flat portions adjacent in the circumferential direction and recessed on the front side. Further, it has a groove portion 171c provided inside the flat portion. The packing 12a is housed in the groove portion 171c.

The annular portion 171 has a through hole 171b at the bottom of the recessed portion. The size of the through hole 171b is such that when the metal base plate 151 is covered with the translucent cover 17, the boss, which is the cover mounting portion 151f of the metal base plate 151, fits into the through hole 171b. The depth of the recessed portion is such that when the metal base plate 151 is covered with the translucent cover 17, the surface of the boss coincides with the bottom surface of the recessed portion or is located slightly behind the bottom surface. Depth.
The covering portion 173 bulges from the inner peripheral side to the front side of the annular portion 171. The covering portion 173 has a tubular portion whose diameter decreases as it moves to the front side, and a dome-shaped portion that bulges in a dome shape from the front end of the tubular portion. The back end of the tubular portion is an inner portion (inner side wall) that constitutes a recess in the groove portion 171c of the annular portion 171. The covering portion 173 may have a light diffusion processing surface on either the front or the back surface. However, if the installation position of the lighting device 1 and the area where a person exists are sufficiently separated, the light diffusion processing surface may not be provided.

When the translucent cover 17 is attached to the metal base plate 151, the boss of the metal base plate 151 is inserted into the through hole 171b of the translucent cover 17 with the packing 12a accommodated in the groove portion 171c of the translucent cover 17. The translucent cover 17 is put on the metal base plate 151 so that the metal base plate 151 is fitted, and the screw body 139c with a washer, which is the fixed body 139c, is screwed into the screw hole of the metal base plate 151.
(6) Fin Cover Body The fin cover body 16 will be described with reference to FIGS. 1 to 3.
As shown in FIG. 1B, the fin cover body 16 protects the back side portion of the fin 153 of the heat sink 15. The fin cover body 16 is made of a resin material. By protecting the fins 153 with the fin cover body 16, the thickness of the metal plate constituting the fins 153 can be reduced.
The fin cover body 16 has, for example, an inner annular portion 161, an outer annular portion 163, a connecting portion 165, a leg portion 167, and a cover portion 169.

The inner annular portion 161 has a through hole for mounting the fin cover body 16 on the tubular body 19 with a mouthpiece. Further, the inner annular portion 161 has a regulating portion that regulates the movement of the fin 153 in the circumferential direction. This regulation portion also functions as a support portion for supporting the fin 153. The outer annular portion 163 regulates the circumferential movement of the fin 153. The connecting portion 165 connects the inner annular portion 161 and the outer annular portion 163. The connecting portion 165 extends in the radial direction to connect the inner annular portion 161 and the outer annular portion 163. The connecting portions 165 are connected at a plurality of locations (here, 6 locations) at intervals in the circumferential direction. This makes it possible to reduce the weight. The leg portion 167 is provided so as to straddle the outer annular portion 163 side portion of the outer annular portion 163 and the connecting portion 165. The leg 167 extends to the front side. The leg portion 167 has a "U" -shaped cross section orthogonal to the stretching direction. The legs 167 are arranged between the fins 153. The cover portion 169 is the outer peripheral side of the fin 153 and covers the back side. The cover portion 169 extends outwardly from the outer peripheral edge of the outer annular portion 163 to the front side.

Although the embodiment has been described above, the embodiment is not limited to this embodiment, and for example, the following modification may be used. Further, the embodiment, the modified example, and the modified example may be combined with each other.
Further, even if there is an example not described in the embodiment or the modified example, or a design change within a range not deviating from the gist, it is included in the present invention.
<Modification example>
(1) Metal Base Plate The metal base plate 151 according to the embodiment is composed of a flat metal plate having an opening 151e in the center. Here, the peripheral edge of the opening 151e has an inner flange portion extending from the inner peripheral edge of the metal base plate 151 to the back side, but the inner flange portion has a structure extending from the inner peripheral edge of the metal base plate 151 to the front side. It may be. Even in this case, the metal base plate can be reinforced.
The inner flange portion is preferably extended to the back side in consideration of the infiltration of water adhering to the back side of the metal base plate 151.
The opening 151e of the metal base plate 151 according to the embodiment has a circular shape when viewed from the front side, but may have another shape such as a polygonal shape such as a quadrangle or an elliptical shape. However, considering the stress during processing, the circular shape is preferable.

(2) Connecting body The connecting body 14 has an annular shape having an opening 141a in the center, but it may have an opening for wiring, and other shapes such as a polygonal shape such as a square shape and an elliptical shape. It may be an opening of.
The connecting body 14 has an inner flange portion 147a and an outer flange portion 147b, but it is not necessary to have either one or both. However, considering the alignment of the LED module 13 with the metal base plate 151, it is preferable to have the outer flange portion 147b. Further, considering the fixing of the circuit (circuit fixing portion 149), it is preferable to have the inner flange portion 147a.
The inner flange portion 147a of the connecting body 14 extends cylindrically toward the LED module 13. However, the inner flange portion 147a may be extended in a cylindrical shape toward the cylinder body 19 side with a mouthpiece. In this case, the alignment can be facilitated by fitting the metal base plate 151 into the inner flange portion.

(3) Coupling of the connecting body and the cylinder with a base In the embodiment, in the connection between the connecting body 14 and the cylinder with a base 19, the connecting body 14 is rotated relative to the cylinder with a base 19. Although an engaging structure is adopted, other coupling structures may be used. Other bonding structures include a screwing structure that connects with screws and the like, a fastening structure that connects with rivets and the like, and a fixing structure that connects with an adhesive or the like.
In the embodiment, the connecting body 14 and the tubular body 19 with a base are connected so as to sandwich the metal base plate 151. However, for example, the LED substrate 133 of the LED module 13 and the metal base plate 151 may be connected in a sandwiched state.

1 Lighting device 13 LED module 14 Connecting body 15 Heat sink 16 Fin cover body 17 Translucent cover 19 Tube with base 151 Metal base plate

Claims (5)

An LED module in which a plurality of LED elements are mounted on a substrate,
A translucent cover that covers the LED module and
A cylinder with a mouthpiece with a mouthpiece at one end,
A flat metal base plate on which the LED module and the translucent cover are mounted on the front side and the cylinder with a base is mounted on the back side.
An LED lighting device which is arranged on the front side of the metal base plate and includes a connecting body for fixing the other end of the cylinder with a mouthpiece to the metal base plate. The tubular body with a mouthpiece has a flange portion extending outward in the radial direction at the other end.
The connecting body has a contact portion that comes into contact with the metal base plate, and has a contact portion.
The LED lighting device according to claim 1, wherein a flat portion of the metal base plate is sandwiched between the flange portion of the tubular body with a base and the contact portion of the connecting body. A claw portion projecting from the flange portion of the tubular body with a mouthpiece is inserted into a through hole provided in the metal base plate and a locking hole provided in the contact portion of the connecting body to lock the cylinder. The LED lighting device according to claim 2, which is fixed. The LED lighting device according to claim 1, wherein the substrate of the LED module is a donut shape having a through hole formed in the center of a circular shape, and the connector is arranged in the through hole of the LED module. The LED lighting device according to claim 4, wherein the LED module has a plurality of substrates, and the donut shape is formed by the plurality of substrates.

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