JP5479642B1 - LED lighting device - Google Patents

Abstract

A thin LED illuminating device capable of uniformly irradiating not only the irradiation target surface but also the surroundings is provided.
An LED lamp main body having an LED substrate on which an LED element is mounted, a lighting unit on which an electronic component constituting a lighting circuit for driving the LED element is mounted, and an LED lamp main body. 2 is provided with a mounting plate 1 that can be mounted on a mounted portion on a vertical surface. The mounting plate 1 is fixed to the mounted portion by fixing means 6. The LED irradiation part of the LED lamp main body 2 has a translucent cover 24, and diffuses and irradiates the lower surface direction and the front surface direction of the translucent cover 24. The LED irradiation part of the LED lamp body 2 is provided in the front part of the LED lamp body 2, and the rear part 21 h of the LED lamp body 2 can be attached to the mounting plate 1.
[Selection] Figure 3

Description

  The present invention relates to an LED lighting device using an LED element as a light source, and more particularly to a direct-mounted LED lighting device that is directly attached to a top plate or a side wall.

  2. Description of the Related Art In recent years, due to an increase in environmental awareness, a self-powered light bulb type LED lamp using an LED element excellent in power saving as a light source has been widespread. More recently, lighting devices using LED elements have been developed and introduced into the market for ceiling-mounted downlights and ceiling-mounted ceiling lights.

  The direct-attached type LED lighting device that is directly attached to the ceiling surface or side wall, depending on the structure of the translucent member of the cover of the lighting device, light is directly irradiated to the operator's eyes, and the operator is very dazzling I had to think. Therefore, an illumination device that is easy on the operator's eyes and can illuminate an appropriate range and is easy to operate has been studied (for example, see Patent Document 1).

  In the illuminating device described in Patent Document 1, the portion covered with the light-shielding member blocks forward light and irradiates only downward, so that only the work top that is the object to be illuminated is illuminated brightly. As a result, there is a problem that a difference in illuminance from the surroundings occurs.

JP 2001-202819 A

  The problem to be solved by the present invention is proposed in order to solve the above-mentioned problems, and provides a thin LED lighting device capable of uniformly irradiating not only the irradiation target surface but also the surroundings. There is.

In order to solve the above-described problem, in the invention according to claim 1, the LED board on which the LED element is mounted, and the lighting on which the electronic component constituting the lighting circuit for driving the LED element to be mounted is mounted. An LED lamp body having a unit;
The LED lamp main body is fixed to a mounted portion on a vertical surface by a fixing means , and includes a mounting plate having a power passage hole for inserting an external electric wire. The mounting plate has an L-shaped side at the upper and lower ends. A fitting plate for the LED lamp main body by fitting the L-shaped side portion into an extension portion formed on the upper and lower end portions on the mounting plate mounting surface side of the LED lamp main body. A space is formed between the mounting surface and
Inside the housing constituting the LED lamp main body, an LED irradiating part in which the LED substrate is arranged on an upper surface part, and a storage part of the lighting unit are partitioned by a central surface part,
The LED irradiation portion side of the central surface portion is a light reflecting surface,
The LED irradiation unit performs diffusion irradiation in at least two plane directions.

  In the invention according to claim 2, the LED irradiating portion of the LED lamp body has a translucent cover, and the diffuse irradiation is performed in the lower surface direction and the front surface direction of the translucent cover. Features.

The invention according to claim 3 is characterized in that the central surface portion is arranged in a direction perpendicular to the LED substrate.

According to a fourth aspect of the present invention, the LED element is arranged at a position closer to the central surface portion than the central portion of the LED substrate.

According to the first to fourth aspects of the present invention, there is provided a thin LED lighting device that can be easily attached to the attached portion and can uniformly irradiate not only the irradiation target surface but also the surroundings. can do.

External perspective view of LED lighting device according to the present embodiment The exploded perspective view of the LED lighting device concerning this embodiment Sectional drawing of the LED lighting apparatus concerning this embodiment External perspective view of the mounting plate according to this embodiment External perspective view of the housing according to the present embodiment The exploded perspective view of the lighting unit concerning this embodiment The exploded perspective view of the sensor unit concerning this embodiment External perspective view of sensor unit cover according to this embodiment

  DESCRIPTION OF EMBODIMENTS Hereinafter, a preferred embodiment when the present invention is applied to a kitchen hand lamp will be described in detail with reference to the drawings. This embodiment is an example, and the present invention is not limited to this.

  1 to 3 show one embodiment of an LED lighting device 100 according to the present invention, and the LED lighting device 100 according to this embodiment has a ceiling surface near a kitchen as shown in FIGS. And an attachment plate 1 attached to the attached portion 5 such as a side wall, and an LED lamp main body 2 fixed to the attachment plate 1. The mounting plate 1 is used particularly when the LED lighting device is mounted on a vertical surface such as a side wall.

  As shown in FIG. 1, the LED lighting device 100 includes a 15 mm diameter through-hole 5 a through which an external power supply line (F cable) 4 of a mounted portion 5 such as a ceiling surface or a side wall protrudes, and power of the mounting plate 1. The through holes 11 are aligned, the mounting plate 1 is fixed to the mounted portion 5 by fixing means described below, and the LED lamp body 2 is fixed to the mounting plate 1. When the LED lamp body 2 is fixed to the mounting plate 1, the LED lamp body 2 and the external power line 4 are connected, and the LED lighting device 100 can be used. By the fixing means of the mounting plate 1 and the LED lamp main body 2, the positional relationship between the mounting plate 1 and the LED lamp main body 2 directly mounted on the mounted portion 5 can be easily changed.

(1. Mounting plate)
The mounting plate 1 is made by punching, pressing, and bending using a stainless steel plate. The mounting plate 1 has a rectangular shape, and as shown in FIG. 4, a circular power through hole 11 for sending the external power line 4 to the LED lamp body 2 is opened at a position near the central portion in the longitudinal direction. A pair of attachment holes 12 through which fixing screws 6 (fixing means) for fixing to the attached portion 5 are inserted at both ends in the longitudinal direction. Here, both the mounting holes 12 are elongated holes whose directions are changed from each other, but one of the mounting holes 12 may be a dull hole so that the fixing work can be easily performed. In addition, the upper and lower end portions of the mounting plate 1 in the width direction are bent in the same direction to form an L-shaped side portion 14 formed so as to be entirely U-shaped and extend in the same direction as the L-shaped side portion 14. A pair of fixing bolts 13 for fixing and fixing the LED lamp main body 2 is fixed to the mounting plate 1 in advance.

The L-shaped side portion 14 of the mounting plate 1 is located with respect to the flat portion of the mounting plate 1 so that the head of the fixing screw does not hit the LED lamp body 2 when the mounting plate 1 is fixed to the mounted portion 5. Projecting at a substantially right angle. As a result, the position can be determined by the L-shaped side portion 14 and the back surface 21h of the LED lamp main body 2, so that stable fixation is possible. The pair of fixing bolts 13 are fixed so as to be perpendicular to the flat portion of the mounting plate 1 and can be screwed into a nut (not shown) in order to fix the mounting plate 1 and the LED lamp body 2. The screw is cut.
Further, the mounting plate 1 is made shorter than the fixed end face of the LED lamp main body 2. Even when the LED lamp main body 2 is fixed to the mounting plate 1 by changing the positional relationship, it is viewed from the LED lamp main body 2 side. The mounting plate 1 is hidden behind the LED lamp body 2 and cannot be seen from the outside.

(2. LED lamp body)
As shown in FIGS. 1 to 3, the LED lamp main body 2 includes various types of lighting circuits that connect the casing 21 and the external power supply line 4 housed in the casing 21 to light the LED element 23. A lighting unit 27 equipped with a lighting board 27e on which electronic components are mounted, a sensor unit 28 on which switches and sensor units are installed, an LED board 22 on which a plurality of LED elements 23 are mounted, and a lighting unit 27 The lighting unit cover 25 covers the LED board 22, and the translucent cover 24 covers the LED substrate 22 and the opening of the housing 21.

(2-1 Case)
As shown in FIGS. 2 to 3 and 5, the housing 21 is formed by integral molding by aluminum extrusion. The casing 21 has a rectangular upper surface portion 21i, a rear surface portion 21h extending vertically from one side in the width direction of the upper surface portion 21i, and a vertical portion extending from the central portion of the upper surface portion 21i so as to face the rear surface portion 21h. The main surface portion 21f (becomes a light reflecting surface portion) and a substantially U-shaped front end portion 21d formed on the other side in the width direction of the upper surface portion 21i are roughly configured.
A power supply hole 21b through which the external power supply line 4 is inserted is opened in the back surface portion 21k, and an extending portion 21k extending outward is formed at both upper and lower ends. In addition, the front part from the central surface part 21f of the housing 21 is an LED irradiation part, and the rear part is a lighting unit storage part.

  A convex portion 21j formed at a position corresponding to the front end portion 21d, the top surface portion of the extending portion 21k, and the central surface portion 21f is protruded from the upper surface portion 21i of the LED lamp body 2 on the housing side. Thereby, when fixing to the to-be-attached parts 5, such as a ceiling surface and a side wall, the uneven | corrugated | grooved part of the to-be-attached part 5 can be absorbed and fixed. Further, the extension portion 21k of the back surface portion 21h is fitted to the L-shaped side portion 14 of the mounting plate 1, whereby the fixing bolt 13 is inserted into the fixing hole 21a of the housing 21, and the nut is formed inside the back surface portion 21h. Etc. (not shown). The two fixing holes 21a of the housing 21 are extended in the longitudinal direction of the housing 21, and the positional relationship between the mounting plate 1 and the LED lamp body 2 can be easily changed.

A concave substrate mounting portion 21e for mounting the LED substrate 22 is provided on the upper surface 21i side inside the housing of the central surface portion 21f and the front end portion 21d, and the LED substrate 22 is slid and mounted. . Similarly, a pair of concave translucent cover mounting portions 21m for mounting the translucent cover 24 is provided on the open end side of the central surface portion 21f and the front end portion 21d. It is inserted by sliding. Further, a pair of concave and convex mounting portions 21n for mounting the lighting unit cover 25 and the sensor unit cover 29 is provided on the open end side of the central surface portion 21f and the back surface portion 21h. The unit cover 29 is inserted by sliding.
Further, by making the central surface portion 21f of the housing 21 on the mounting surface side of the LED element 23 a glossy surface, pasting a highly reflective sheet, or applying a highly reflective resin, the light reflection efficiency. And the light extraction efficiency can be improved.

  A convex positioning portion 21g (FIG. 3) is provided inside the upper surface portion 21i of the casing 21 that houses the lighting unit 27 in parallel with the longitudinal direction of the casing 21, and is fitted to the concave shape of the lighting unit 27. By combining, positioning can be performed. Since the positioning portion 21g has a convex shape, the thickness of aluminum is thick, so that it can be fixed by cutting a screw groove in the positioning portion 21g and directly inserting a screw for fixing the lighting unit 27 into the positioning portion 21g. It has become. Similarly, an end cover 26 (FIG. 2), which will be described later, is fitted to both side surfaces of the casing 21 in the longitudinal direction, and aluminum is used so that screws can be inserted into a plurality of locations of the fitting portion. By forming a recess (not shown) according to the above, it is possible to directly insert and fix a fixing screw. Thereby, it can be easily fitted, workability is improved, and it is possible to reduce the man-hours and the cost of providing the screw insertion portion.

  With the L-shaped side portion 14 of the mounting plate 1 fitted between the extending portions 21k of the rear surface portion 21h of the housing 21, a space is formed between the housing rear surface portion 21h and the mounting plate 1 as shown in FIG. The part 21o is formed. The space 21o can be used to fix the mounting plate 1 and the mounted portion 5 with the fixing screw 6, and the head of the fixing screw 6 is placed in the space 21o. Further, the heat generated by the lighting unit 27 and the LED element can be radiated from the space 21 o through the housing 21.

(2-2 LED substrate)
As shown in FIGS. 2 to 3, the LED substrate 22 has a rectangular shape, and is inserted and fixed to the substrate mounting portion 21 e of the housing 21 by sliding. Thereby, since the LED substrate 22 is in contact with the housing 21, it is possible to dissipate heat generated by the LED element 23. An LED element 23 is mounted on the lower surface portion of the LED substrate 22. In this embodiment, the LED elements 23 are positioned closer to the central surface portion 21f than the central portion in the width direction of the LED substrate 22, and are arranged in a line along the longitudinal direction of the LED substrate. A connection terminal is provided at one end in the longitudinal direction of the LED substrate 22 and is electrically connected to the lighting unit 27. At this time, since the LED board 22 is in contact with the board mounting portion 21 e of the housing 21, the heat generated from the LED elements 23 can be radiated from the housing 21 through the LED board 22.

  Thus, LED light is emitted from the LED element 23 toward the lower side of the translucent cover 24 at a predetermined irradiation angle, and a part of the light is reflected by the central surface portion 21f and also toward the front surface of the translucent cover 24. In this way, the entire surface including the lower surface direction and the front surface direction of the translucent cover 24 is uniformly irradiated. The arrangement of the LED elements 23 is not limited to this embodiment, and the arrangement of the LED elements 23 is arbitrary as long as it can be uniformly irradiated from the translucent cover 24 in at least two directions. Further, an insulating sheet or the like may be interposed between the LED substrate 22 and the inner surface of the housing 22.

Moreover, light extraction efficiency can be improved by bonding a highly reflective sheet to the mounting surface side of the LED element 23 or applying a highly reflective resin.
In addition, as LED element 23 mounted in this LED board 22, well-known various LED elements, organic EL elements, etc. can be used. In the illustrated embodiment, a high-luminance LED element that emits white light for illumination is used.

(2-3 Translucent cover)
The translucent cover 24 is molded into a substantially curved L-shape using polycarbonate. As shown in FIGS. 2 to 3, the translucent cover 24 is provided with a translucent cover mounting portion 21 m provided at the front end portion 21 d and the end portion of the central surface portion 21 f of the housing 21, and an end portion in the longitudinal direction. The slide is inserted and attached. Further, both side portions of the translucent cover 24 in the longitudinal direction are fitted and fixed by end covers 26.

As shown in FIGS. 2 to 3, the translucent cover 24 is formed by forming the translucent cover 24 into a continuous curved surface, or embossing that forms a high-density light diffusion surface on the translucent cover 24. Irradiation can be performed uniformly by processing or adding a diffusing agent to the material. In addition, the light reflected by the translucent cover 24 is diffusely reflected and further reflected by the central surface portion 21f of the casing 21, and this can be repeated to illuminate the entire surface of the translucent cover 24, which is uniform as a light source. Is irradiating light.
This makes it possible to uniformly irradiate light from the LED elements on the entire surface of the translucent cover 24.

(2.-4 lighting unit)
As shown in FIGS. 2 to 3 and 6, the lighting unit 27 is installed on the positioning portion 21 g inside the upper surface portion 21 i of the housing 21. The lighting unit 27 includes a lighting circuit 27d for lighting the LED element 23, an insulating cover 27c that protects the lighting circuit 27d, and a metal cover 27a. The lighting circuit 27d includes a lighting substrate 27e on which various electronic components 27f are mounted, and is connected to the external power supply line 4. The lighting circuit 27d is covered with an insulating cover 27c made of polycarbonate in order to insulate it from the casing 21. The electronic component 27f constituting the lighting circuit 27d is a known electronic component such as various diodes, capacitors, ICs, resistors for performing overcurrent protection, noise cut, rectification, smoothing, dimming control, and the like. Reference numeral 27i denotes a power terminal block.

  Furthermore, the insulating cover 27c is covered with a metal cover 27a for blocking unnecessary noise outside. A concave portion 27h (FIG. 6) formed on the bottom surface of the extending portion 27b of the metal cover 27a is fitted to the positioning portion 21g of the housing 21, and extends from both longitudinal ends of the upper surface portion of the metal cover 27a. The protruding L-shaped metal extension portion 27b is fixed to the positioning portion 21g of the housing 21 with screws or the like. When the metal extension 27 b is fixed to the casing 21, the ground line from the lighting unit 27 is fixed to the casing 21 together. Thereby, the noise generated from the lighting unit 27 can be attenuated. An extraction hole 27g and an insertion hole 27j into which the external power supply line 4 is inserted are opened at one end surface portion in the length direction of the metal cover 27a and the insulating cover 27c.

  Further, as a method of fixing the lighting unit 27 to the casing 21, in addition to the above-described fixing method using screws, the lighting unit 27 is slid into the casing 21 and is connected to the rear portion 21h of the casing 21. It is also possible to arrange and fix a spring.

(2.-5 lighting unit cover)
The lighting unit cover 25 is molded into a rectangular shape using polycarbonate. As shown in FIGS. 2 to 3, the lighting unit cover 25 is bent and inserted between the back surface portion 21 h and the central surface portion 21 f of the housing 21 so as to cover the lighting unit 27 fixed to the housing 21. To attach. Thereby, it is possible to make the lighting unit 27 and its wiring invisible from the outside.

(2.-6 sensor unit)
As shown in FIGS. 2 and 7, the sensor unit 28 has one side opened, and a sensor board 28c is sandwiched and fixed to a rectangular sensor cover member 28a made of polycarbonate. Yes. The sensor cover member 28a has switch insulation for insulating the sensor window 28i that transmits light from the outside, the slide switch window 28j for bringing the operation part of the slide switch 28f to the outside, and the terminal of the switch 29a. A portion 28k is provided. An LED 28d, a light receiving element 28e, a slide switch 28f, and a sensor connection terminal 28g are mounted on the front surface of the sensor substrate 28c, and an electronic component 28h (detailed illustration is omitted) is mounted on the back surface of the sensor substrate 28c. . Further, the LED 28d and the light receiving element 28e are separated by a sensor protective cover 28b made of black silicon so that the light from the LED 28d does not leak to the light receiving element 28e and malfunction. A sensor connection terminal 28g is provided on the sensor board 28c and is electrically connected to the lighting unit 27.

  The light output from the LED 28d is output to the outside through the sensor window 28i, and the light reflected by the reflecting material such as the hand is input to the light receiving element 28e again through the sensor window 28i, Reflection is determined by the substrate 28c. Thereby, it has the structure which controls ON / OFF of the LED lamp main body 2. FIG. The slide switch 28f is a switch that can be set in three settings, and is used in three modes in the present embodiment. The first mode is OFF (no sensor control), the second mode is ON (sensor control is performed but the sensor detection distance is short), and the third mode is ON (sensor control). Although the sensor detection distance is long).

(2.-7 Sensor unit cover)
As shown in FIGS. 2 and 8, the sensor unit cover 29 is molded into a rectangular shape. The sensor cover member 28a of the sensor unit 28 is fixed to the sensor unit cover 29, and the sensor unit cover 29 is inserted between the back surface portion 21h and the central surface portion 21f of the housing 21 by sliding. Thereby, it is possible to make the sensor unit 28 invisible from the outside.
The sensor unit cover 29 is provided with a switch 29a for turning on and off the LED lamp body 2, a sensor opening 29b corresponding to the sensor window 28i, and an opening 29c corresponding to the slide switch 29f.

(2.-8 end cover)
As shown in FIGS. 2 to 3, the end cover 26 is a pair and covers both ends of the casing 21 to constitute the LED lamp body 2. The end cover 26 is fitted and covered with each end face of the housing 21, the LED substrate 22, the translucent cover 24, and the lighting unit cover 25, and is fixed to the housing 21 with screws. Thereby, LED lamp main body 2 becomes a structure fixed except lighting unit cover 25 used when attaching, and also produces the effect which prevents dust, an insect, etc. invading LED lamp main body 2 together. Can do.

(3. Operation)
The attachment method and operation method of the LED lighting apparatus 100 of this invention are demonstrated. First, the mounting plate 1 is fixed to the mounted portion 5 by inserting the external power line 4 into the power through hole 11 and inserting the mounting screw 6 into the mounting hole 12. Next, the lighting unit cover 25 of the LED lamp body 2 is removed, and the external power supply line 4 is inserted into the power supply hole 21 b to connect to the lighting unit 27. The fixing hole 21a of the LED lamp main body 2 is inserted into the fixing bolt 13 of the mounting plate 1, and the LED lamp main body 2 is fixed to the mounting plate 1 with a nut (not shown). At this time, the positional relationship between the mounting plate 1 and the LED lamp body 2 can be optimally adjusted. Thereafter, the lighting unit cover 25 is fitted into the housing 21, and the attachment of the LED lighting device 100 is completed.
The LED illumination device 100 is turned ON / OFF by the switch 29a of the sensor unit cover 29. The sensor detection mode can be switched by a slide switch 28f operated from the slide switch opening 29c of the sensor unit cover 29. By turning on the detection mode by the sensor, the light from the LED 28 d passes through the sensor cover member 28 a and is irradiated from the sensor opening 29 b of the sensor unit cover 29. The irradiated light is reflected by a hand or the like and is transmitted from the sensor opening 29b of the sensor unit cover 29 through the sensor cover member 28a and input to the light receiving element 28e. The ON / OFF operation of the LED lighting device 100 is performed according to the intensity of the input light.

(4. Other)
The LED lighting device 100 of the present invention has been described with respect to the form of fixing to the mounted portion 5 on the side wall surface (including a vertical surface or an inclined surface close to the vertical surface) using the mounting plate 1, but as shown in FIG. By opening the power supply hole 21b in the upper surface portion 21i of the housing 21 and forming the directly attached screw holes 21c at a plurality of locations in the longitudinal direction of the upper surface portion 21i. It can be attached directly to the mounted portion on the ceiling wall (horizontal wall) or the like. Thereby, it sets so that a user can select the attachment place of LED lighting apparatus 100 freely according to a use.

  As described above, the present embodiment includes a mounting plate that is fixed to the mounted portion and on which the LED lamp main body is mounted, and the mounting plate and the LED lamp main body can be fixed by fixing means. By these, the positional relationship between the mounting plate directly mounted on the mounted portion and the LED lamp main body can be easily changed, and an LED lighting device that can be thinned is provided, and exhibits good design properties. .

  As mentioned above, although embodiment of this invention was described, this invention is not restricted to these embodiment, Even if there is a design change of the range which does not deviate from the summary of this invention, it is included in this invention. That is, various changes and modifications that can be made by those skilled in the art are also included in the present invention.

  INDUSTRIAL APPLICABILITY The present invention can be widely applied as an LED lighting device installed along a kitchen, a closet, a top plate such as a sink, a shelf bottom, a wall side surface, or the like.

1: Mounting plate 11: Power through hole 12: Mounting hole 13: Fixing bolt 14: L-shaped side part 2: LED lamp body 21: Housing 21a: Fixing hole 21b: Power supply hole 21c: Directly attached screw hole 21d: Front end Part 21e: Substrate mounting part 21f: Center surface part 21g: Positioning part 21h: Back part 21i: Upper surface part 21j: Protruding part 21k: Extension part 21m: Translucent cover mounting part 21n: Mounting part 21o: Space part 22: LED substrate
23: LED element 24: Translucent cover 25: Lighting unit cover 26: End cover 27: Lighting unit 27a: Metal cover 27b: Metal extension part 27c: Insulation cover 27d: Lighting circuit 27e: Lighting substrate 27f: Electronic component 27 g: extraction hole 27 h: concave portion 27 i: power terminal block 27 j: insertion hole 28: sensor unit 28a: sensor cover member 28b: sensor protection cover 28c: sensor substrate 28d: LED
28e: light receiving element 28f: slide switch 28g: sensor connection terminal 28h: electronic component 28i: sensor window 28j: slide switch window 28k: switch insulating part 29: sensor unit cover 29a: switch 29b: sensor opening 29c: slide switch opening 4: External power supply line 5: Mounted portion 5a: Through hole 6: Fixing screw (fixing means)
100: LED lighting device

Claims (4)

An LED lamp body having an LED board on which an LED element is mounted, and a lighting unit on which an electronic component constituting a lighting circuit for lighting the LED element is mounted;
The LED lamp main body is fixed to a mounted portion on a vertical surface by a fixing means , and includes a mounting plate having a power passage hole for inserting an external electric wire. The mounting plate has an L-shaped side at the upper and lower ends. A fitting plate for the LED lamp main body by fitting the L-shaped side portion into an extension portion formed on the upper and lower end portions on the mounting plate mounting surface side of the LED lamp main body. A space is formed between the mounting surface and
Inside the housing constituting the LED lamp main body, an LED irradiating part in which the LED substrate is arranged on an upper surface part, and a storage part of the lighting unit are partitioned by a central surface part,
The LED irradiation portion side of the central surface portion is a light reflecting surface,
The LED illumination device irradiates and diffuses light in at least two directions.   The LED illumination device according to claim 1, wherein the LED irradiation unit of the LED lamp main body has a translucent cover, and diffuses and irradiates the lower surface direction and the front surface direction of the translucent cover. The LED lighting device according to claim 1 , wherein the central surface portion is arranged in a direction perpendicular to the LED substrate. 4. The LED lighting device according to claim 1 , wherein the LED element is disposed at a position closer to the central surface portion than a central portion of the LED substrate. 5.