KR101040317B1 - Lighting apparatus - Google Patents

Abstract

PURPOSE: An indirect lighting apparatus is provided to receive effectively a plurality of LED modules and radiators within a cylindrical radiator and to improve a heat-radiating function. CONSTITUTION: A lighting apparatus(100) comprises first and second LED modules(120a,120b), first and second radiators(110a,110b), and a reflector(140). The first and second LED modules are arranged on one surface of a substrate. The first and second radiators radiate the heat from the LEDs and have a plurality of inner walls for defining reception spaces to receive the first and second LED modules. The other surface of the substrate is installed on at least one inner wall of the inner walls to form a coupling body. The coupling body has a cylindrical structure having an opening through which the light emitted from the LEDs of the first and second LED modules passes. The reflector is fixed to the inside of the coupling body and reflects the light emitted from the LEDs of the first and second LED modules to the opening.

Description

Lighting device {LIGHTING APPARATUS}

The present invention relates to a lighting device, and more particularly to an indirect lighting device using an LED.

Light emitting diode (LED) is an energy device that converts electrical energy into light energy, and has an advantage of high conversion efficiency, low power consumption, and long life compared to incandescent bulbs. As these advantages are widely known, interest in lighting devices using LEDs is increasing. Reflecting this concern, lighting companies are releasing lighting devices using LEDs.

Lighting devices that use LEDs can be broadly divided into direct lighting devices and indirect lighting devices. The direct lighting device refers to a lighting device that is emitted without changing the path of the light emitted from the LED, and the indirect lighting device refers to a device in which the path of the light emitted from the LED is changed through a reflecting means or the like. Indirect lighting device has the advantage of protecting the eyes of the user by attenuating the strong light emitted from the LED to some extent, compared to the direct lighting device.

The present invention provides an indirect lighting device capable of effectively storing a plurality of LED modules and a reflector in a cylindrical heat sink.

In addition, the present invention provides an indirect lighting device that can improve the heat dissipation function.

Illumination apparatus according to the present invention, the first and second LED module is arranged a plurality of LED on one surface of the substrate; And a plurality of inner walls for dissipating heat from the plurality of LEDs and defining an accommodation space for accommodating the first and second LED modules therein, the other side of the substrate being one of the plurality of inner walls. It is formed on at least one inner wall, each formed integrally, the outer shape of the combined body coupled to each other has a cylindrical shape having an opening formed for the light emitted from the plurality of LEDs of the first and second LED module is emitted First and second heat sinks; And a reflector fixedly installed in the combination and reflecting light emitted from the plurality of LEDs of the first and second LED modules to the opening.

Here, a plurality of heat dissipation fins are formed on the upper and side surfaces facing the opening in the assembly, and the outermost circumference of the plurality of heat dissipation fins preferably has a cylindrical shape.

Using the lighting apparatus according to the present invention, there is an advantage that can effectively accommodate a plurality of LED modules and reflectors in the cylindrical heat sink.

In addition, there is an advantage that can improve the heat radiation function.

1 is a perspective view of a lighting apparatus according to an embodiment of the present invention,
2 is an exploded perspective view of the lighting apparatus shown in FIG.
3 is a cross-sectional view of the lighting apparatus shown in FIG.
4 is a perspective view of the lighting apparatus shown in FIG. 1 seen from below;
5 is a view for explaining the relationship between the heat sink and the LED module in the lighting device shown in FIG.
6 is another embodiment of the lighting apparatus shown in FIG.
7 (a) to 7 (b) are a perspective view and an exploded view of another embodiment of the LED module shown in FIG.
8 is a view from above of the lighting device shown in FIG. 4;
9 is another embodiment of the lighting apparatus shown in FIG.
10 is a perspective view of the optical plate shown in FIG.
11 is a perspective view of the connecting member shown in FIG.
12 is a perspective view of the reflective cover member 180 shown in FIG. 2.
13a to 13c show data relating to a first experiment,
14a to 14c show data relating to a second experiment,
15a to 15c show data relating to a third experiment,
16A-16C show data relating to a fourth experiment.

1 is a perspective view of a lighting device according to an embodiment of the present invention, Figure 2 is an exploded perspective view of a lighting device according to an embodiment of the present invention shown in Figure 1, Figure 3 is an embodiment of the invention shown in FIG. A-A 'sectional view of the lighting apparatus according to the example, Figure 4 is a perspective view of the lighting apparatus according to the embodiment of the present invention shown in FIG.

1 to 4 to describe the lighting device 100 according to an embodiment of the present invention in detail.

1 to 3, the heat sink 110 is formed by the combination of the first heat sink 110a and the second heat sink 110b. The first heat sink 110a and the second heat sink 110b may be easily coupled by the combination of the first screw 115 and the first female screw 119. When the first heat sink 110a and the second heat sink 110b are combined to form a cylindrical heat sink 110.

1 to 3, the top and side surfaces of the cylindrical heat sink 110 have a plurality of heat dissipation fins for dissipating heat generated from the first and second LED modules 120a and 120b to the outside. The plurality of heat sink fins widen the cross-sectional area of the heat sink 110 to improve heat dissipation characteristics. When a plurality of heat radiation fins are formed, the surface connecting the outermost circumference of the plurality of heat radiation fins is cylindrical.

Here, the cylindrical heat sink 110 may be a heat sink without a plurality of heat radiation fins. In this case, although the heat dissipation effect may be somewhat lower than the heat dissipator 110 shown in FIGS. 1 to 3, it should be noted that the present invention may be implemented even without the heat dissipation fin.

Referring to FIG. 4, the heat sink 110 houses the first and second LED modules 120a and 120b, the first and second fixing plates 130a and 130b, and the reflector 140 therein. The storage space in which the first and second LED modules 120a and 120b, the first and second fixing plates 130a and 130b, and the reflector 140 are accommodated is a cube defined by an inner wall of the heat sink 110. The opening 117 of the heat sink 110 is formed by opening one surface of the cube defined by the inner wall, and has a rectangular shape. In summary, the heat sink 110 is cylindrical, but the storage space inside the heat sink 110 has a hexahedron shape.

Each of the first heat sink 110a and the second heat sink 110b has a body formed integrally. Each of the first heat sink 110a and the second heat sink 110b is made of a material having excellent heat transfer. Such materials may include aluminum, copper, and the like.

The first LED module 120a, which is a heating element, is installed on an inner wall of the first heat sink 110a, and the second LED module 120b, which is a heat generating element, is installed on an inner wall of the second heat sink 110b. The integral formation of the first heat sink 110a helps to efficiently transfer heat generated from the first LED module 120a which is a heating element. That is, once the heat generated from the first LED module 120a is transferred to the first heat sink 110a, heat is transferred through the entire body of the first heat sink 110a integrally formed. At this time, since the first heat sink 110a is integrally formed, there is no portion that prevents or blocks heat transfer, and thus high heat dissipation effect can be achieved.

Like the first heat sink 110a, the second heat sink 110b efficiently radiates heat generated from the second LED module 120b, which is a heat generating element. Providing the first and second heat sinks 110a and 110b to the first and second LED modules 120a and 120b as heating elements respectively provides heat dissipation means dedicated to the heat dissipation of each of the heat generating elements. Is to increase. That is, the number or arrangement of the heating element is determined to provide a heat dissipation means according to this is part of the inventors of the present invention, through which high heat dissipation effect was seen. This will be described in detail with reference to FIGS. 5 and 6.

5 is a view for explaining the relationship between the heat sink 110 and the LED module 120 in the lighting apparatus according to the embodiment of the present invention shown in FIG. 5 is a top view of the lighting apparatus illustrated in FIG. 4 as viewed from above of FIG. 4, showing only the heat sink 110 and the LED module 120.

Referring to FIG. 5, the heat sink 110 has a circular shape, and the opening 117 of the heat sink 110 has a rectangular shape. The inner wall of the heat sink 110 is composed of five surfaces. Five inner surfaces and the openings 117 define storage spaces for accommodating the first and second LED modules 120a and 120b, the first and second fixing plates 130a and 130b, and the reflector 140.

The first heat sink 110a and the second heat sink 110b constituting the heat sink 110 each have a semi-cylindrical shape. The two combine with respect to the first reference line 1-1 ′ to form one cylindrical heat sink 110. However, the joining boundary does not have to coincide with the first reference line 1-1 ′. For example, a position spaced apart from the first reference line 1-1 ′ by the same degree in the upper and lower portions of FIG. 5 may be the boundary.

Since one cylindrical heat sink 110 has a cylindrical shape, the cylindrical heat sink 110 can be inserted into a circular hole in which an existing lighting device is installed, such as a ceiling, and thus is easily installed. In addition, it is easy to replace the conventional lighting device that is already in use.

As shown in FIG. 5, in the four inner walls except for the ceiling inner wall facing the opening surface 117 of the five inner walls of the heat sink 110, the LED module may be installed on two inner walls facing each other. have.

The first LED module 120a is installed on the inner wall of the first heat sink 110a. In addition to the inner wall on which the first LED module 120a is installed, the first heat sink 110a further includes three inner walls. Therefore, the heat generated from the first LED module 120a, which is a heating element, may be radiated through not only the inner wall on which the first LED module 120a is installed, but the remaining three inner walls.

The second LED module 120b is installed on the inner wall of the second heat sink 110b. In addition to the inner wall on which the second LED module 120b is installed, the second heat sink 110b further includes three inner walls. Therefore, heat generated from the second LED module 120b, which is a heating element, may be radiated through not only the inner wall on which the second LED module 120b is installed, but the remaining three inner walls.

The first and second LED modules 120a and 120b, which are heat generating elements, emit light toward the center of the cylindrical heat sink while the first heat sink 110a and the second heat sink 110b are coupled to each other. The first and second radiators 110a and 110b are disposed on circumferences opposite to the center, respectively. As a result, heat dissipation is performed from the centrifugal direction in the circumferential direction and in all directions constituting the circumference when viewed in the entire cylindrical heat dissipator 110, so that the heat dissipation effect is excellent. In addition, a space in which a heat dissipation member, such as a heat dissipation fin formed on the heat dissipation member, can be installed is located at the outer periphery of the cylinder, thereby securing a large space, so that the degree of freedom in designing the heat dissipation member is high.

6 is a view for explaining the relationship between the heat sink and the LED module according to another embodiment of the present invention.

Referring to FIG. 6, as shown in FIG. 5, the heat sink 110 has a circular shape, and the opening 117 of the heat sink 110 has a rectangular shape.

The heat sink 110 may be separated into four heat sinks 110A, 110B 110C, and 110D based on the second reference axis 2-2 ′ and the third reference axis 3-3 ′. That is, one cylindrical radiator 110 is formed by the combination of four radiators 110A, 110B 110C, and 110D.

Four LED modules 120a, 120b, 120c, and 120d are disposed on each of the four inner walls except for the inner wall facing the opening 117 among the five inner walls of the heat sink 110.

 As described above, in the lighting apparatus illustrated in FIGS. 5 and 6, a plurality of heat sinks exist as many as the number of LED modules which are heating elements. In addition, first and second heat sinks 110a and 110b integrally formed with respect to each of the first LED module 120a and the second LED module 120b as heating elements are prepared. Here, the first and second heat sinks 110a and 110b may be integrally formed in the same manner as casting. The integrally molded first and second heat sinks 110a and 110b have no seams or coupling portions, and thus, transfer of heat generated from the heating element is not disturbed or blocked.

In addition, since there is an inner wall to which the LED module is attached, in addition to an inner wall to which the LED module is attached, a single inner wall of the cylindrical heat sink 110 to which the first and second radiators 110a and 110b are coupled, the conventional LED module It is superior to the heat radiation effect of the lighting device having a heat sink attached only below.

In addition, as described above with reference to FIG. 5, light from the LED module is emitted in the direction of the center of the cylindrical heat sink, while heat generated in the LED module is generated through the heat sink installed in the circumference opposite to the center. As a result, heat dissipation is performed from the centrifugal direction in the circumferential direction and in all directions constituting the circumference, so that the heat dissipation effect is excellent. In addition, a space in which a heat dissipation member, such as a heat dissipation fin formed on the heat dissipation member, can be installed is located at the outer periphery of the cylinder, thereby securing a large space, so that the degree of freedom in designing the heat dissipation member is high.

Hereinafter, the devices accommodated in the inner storage space of the cylindrical heat sink 110 will be described in detail with reference to FIGS. 2 to 4. Here, the first LED module 120a and the second LED module 120b, the first fixing plate 130a, and the second fixing plate 130b facing each other based on the reflector 140 have the same shape. Therefore, hereinafter, detailed descriptions of the second LED module 120b and the second fixing plate 130b will be omitted.

The first LED module 120a may include a substrate 121a, a plurality of LEDs 123a, a plurality of focusing lenses 125a, a protrusion 127a, and a holder. Here, the holder will be described later in the description of Figures 7a to 7b.

A plurality of LEDs 123a and a plurality of focusing lenses 125a are disposed on one surface of the substrate 121a. The other surface of the substrate 121a is tightly fixed to the inner wall of the first heat sink 110a.

The plurality of LEDs 123a are spaced apart from each other and arranged in a novel shape on one surface of the substrate 121a. That is, the plurality of LEDs 123a are arranged in two rows. Two LEDs are arranged in the first row and three LEDs in the second row. An arrangement feature of the plurality of LEDs 123a will be described later with reference to FIGS. 8 to 9.

The focusing lens 125a collects light emitted in all directions from the LED 123a in a predetermined direction. The focusing lens 125a is formed on one surface of the substrate 121a and is formed to surround the LED 123a. The shape of the focusing lens 125a has a funnel shape with a solid filling. Therefore, the cross section of the focusing lens 125a has a trapezoid. On the other hand, a groove for accommodating the LED 123a is formed on one surface of the focusing lens 125a that is in contact with the substrate 121a.

The focusing lens 125a has a one-to-one correspondence with the LED 123a. Therefore, the number of focusing lenses 125a is equal to the number of LEDs 123a. Here, the height of the focusing lens 125a is preferably formed to be higher than the height of the LED 123a.

The focusing lens 125a collects light emitted in all directions from the LED 123a to the reflector 140. In addition, since the focusing lens 125a surrounds the LED 123a, the user may not directly see the strong light emitted from the LED 123a. To this end, the outer surface of the focusing lens 125a may be made of an opaque material.

The inside of the focusing lens 125a illustrated in FIG. 2 may be a material that is transparent and filled with a material having a predetermined refractive index. Such materials may include acrylic, PMMA, and the like. In addition, it may further include a fluorescent material therein.

The protruding portion 127a is accommodated in the receiving portion 133a of the first fixing plate 130a, and then the rear surface of the receiving portion 133a of the first fixing plate 130a has a protruding shape and a catching portion of the reflector 140 ( 141a). Embodiments without the first fixing plate 130a or without the receiving portion 133a in the first fixing plate 130a may be possible. In this case, the protrusion 127a may be directly received by the catching portion 141a of the reflector 140. have. The protrusion 127a may serve as a male screw of the snap button, and the receiving portion 133a and the locking portion 141a may serve as a female screw of the snap button.

When the protrusion 127a is coupled through the receiving portion 133a of the fixing plate 130a or directly in contact with the locking portion 141a, the reflector 140 is fixed to the fixing plate 130a or the first LED module 120a. . Therefore, the reflector 140 is limited to the movement in the opening 117 direction (light emission direction). In addition, the movement in the direction perpendicular to the light emission direction from the LED modules 120a and 120b among the directions perpendicular to the light emission direction of the reflector 140 is limited by the inner wall of the heat sink 110. In addition, the movement in the light emitting direction from the LED modules 120a and 120b in the direction perpendicular to the light output direction of the reflector 140 may be performed by the LED modules 120a and 120b or the fixed plate 130a fixed to the heat sink 110. , 130b).

Therefore, it is not necessary to fix the reflector 140 to the inner wall of the first LED module 120a or the first heat sink 110a by using a separate fixing means such as a screw. In addition, a separate fixing means for fixing the reflector 140 to the inner walls of the first and second radiators 110a and 110b is not required. As described above, since the reflector 140 does not have an additional portion such as a through hole for penetrating a separate fixing means, the reflector 140 may be formed to a minimum size to secure the size of the inclined reflective region. Here, being able to be formed with a minimum size to secure the reflecting region of the reflector 140 means that the total size of the lighting apparatus can be miniaturized compared to the amount of light emitted.

7A to 7B are perspective views and exploded views showing another embodiment of the LED module according to the embodiment of the present invention shown in FIG. 2.

In the LED module 120a according to another exemplary embodiment illustrated in FIGS. 7A to 7B, a holder 129a is further added to the LED module 120a illustrated in FIG. 2.

The holder 129a has a hollow cylindrical shape, and the upper and lower surfaces thereof are opened. The holder 129a is formed to surround the focusing lens 127a on the substrate 121a. The holder 129a serves to fix the focusing lens 125a.

2 to 3, the first fixing plate 130a may include a plurality of through holes 131a, a receiving portion 133a, and a plurality of second male threads 135a. The shape of the first fixing plate 130a is preferably the same as or similar to the shape of the substrate 121a.

One focusing lens 125a is inserted into one through hole 131a. The through hole 131a may have a shape through which the focusing lens 125a may pass.

The accommodating part 133a may accommodate the protrusion 127a of the first LED module 120a. When the protrusion 127a is accommodated in the accommodating part 133a, the first LED module 120a and the first fixing plate 130a may be fixed in close contact with each other. When the protrusion 127a is detached from the accommodating part 133a, the first fixing plate 130a and the first LED module 120a may be easily detached.

The plurality of second male threads 135a penetrate the first fixing plate 130a and the first LED module 120a and insert a plurality of second female screws (not shown) formed on the inner wall of the first heat sink 110a. Can be fixed. The first fixing plate 130a and the first LED module 120a may be easily attached to and fixed to an inner surface of the first heat sink 110a by the plurality of second male threads 135a, and the first heat sink may be fixed. It can be easily detached from the inner surface of (110a).

The reflector 140 changes the path of the light emitted from the first and second LED modules 120a and 120b. Referring to FIG. 4, the reflector 140 reflects light emitted from the first and second LEDs 123a and 123b into the opening 117. As shown in FIG. 2, the reflector 140 has a hollow hexahedron shape, but one side and the bottom of one pair of two pairs of sides facing each other are opened, and the upper surface having a function of reflection is 'V'. It has a shape of a child. Here, the bottom surface is an opening 117.

The first and second fixing plates 130a and 130b and the first and second LED modules 120a and 120b are inserted into the pair of open sides. By inserting the first and second fixing plates 130a and 130b and the first and second LED modules 120a and 120b, the two side surfaces of the reflector 140 in the open state are closed. Here, the reflector 140 is coupled to the projected portion formed on the rear surface of the receiving surface in which the protrusions 127a and 127b are accommodated in the receiving portions 133a and 133b of the first and second fixing plates 130a and 130b. By forming engaging grooves 141a and 141b, the first and second fixing plates 130a and 130b may be firmly fixed to the reflector 140. Here, as described above, when there is no first fixing plate 130a or no receiving portion 133a in the first fixing plate 130a, the protrusion 127a may be directly received in the locking groove 141a.

The reflector 140 has a shape corresponding to the storage space of the heat sink 110. That is, the reflector 140 is formed to exactly fit in the storage space defined by the inner walls of the heat sink 110. Therefore, when the first and second heat sinks 110a and 110b are coupled to each other, the reflector 140 is precisely fitted into the storage space, and thus cannot move inside the heat sink 110.

As described above, the reflector 140 has limited movement in the direction of the opening 117 (light emission direction) by the protrusions 127a and 127b of the first and second LED modules 120a and 120b. In addition, since the reflector 140 has a shape that fits into the storage space of the heat sink 110, when the first and second heat sinks 110a and 110b are coupled to each other, the first and second heat sinks ( 110a and 110b press the reflector 140. Therefore, the reflector 140 is limited to the movement in the direction perpendicular to the light exit direction as well as the light exit direction.

Therefore, the lighting apparatus of the present invention does not require any additional fixing means, for example, screws or the like, for fixing the reflector 140 to the inside of the heat sink 110. In addition, the reflector 140 may be formed to a minimum size to secure the size of the inclined reflecting region, it is possible to miniaturize the overall size of the lighting device compared to the amount of light emission.

In addition, the protrusions 127a and 127b of the first and second LED modules 121a and 121b are fitted into the receiving portions 133a and 133b of the first and second fixing plates 130a and 130b, respectively, After fixing to the inner walls of the second heat dissipator (110a, 110b), respectively, the receiving portion (133a, 133b) is positioned so as to be in contact with the engaging portions (141a, 141b) with the reflector 140 therebetween, the first And when the second radiator (110a, 110b) is coupled in the direction in which the reflector 140 is located, the reflector 140 is fixed to the inner storage space of the radiator (110). Accordingly, assembling ease can be obtained, such as no additional screw operation is required for fixing the reflector 140 to the heat sink 110 in which the opening 117 is formed in only one direction.

Referring back to FIGS. 2 and 3, the 'V'-shaped upper surface of the reflector 140 (hereinafter referred to as a “reflection surface”) reflects light emitted from the first and second LED modules 120a and 120b. The path of the light is changed to the opening 117.

The light incident from the first and second LED modules 120a and 120b formed on both sides of the reflecting surface to the reflecting surface of the reflector 140 is reflected from the reflecting surface of the reflector 140 to be used in the opening direction (light emission direction). 1 will be directed downward. At this time, the distribution of phases formed on the reflecting surface of the reflector 140 is due to the characteristics of the arrangement of the LEDs of the first and second LED module (120a, 120b). For a detailed description thereof, the LEDs of the first and second LED modules 120a and 120b will be described with reference to FIGS. 8 and 9.

FIG. 8 is a view from above of the lighting apparatus according to the embodiment of the present invention illustrated in FIG. 4, wherein light emitted from the plurality of LEDs 123a and 123b of the first and second LED modules 120a and 120b is emitted. When the incident surface of the reflector 140 is incident, the distribution of the images 141a and 141b formed on the reflective surface is illustrated. Here, when it is assumed that the reflecting surface of the reflector 140 shown in FIGS. 8 to 9 is a mirror surface, FIGS. 8 to 9 show a state observed through the opening 117. In practice, the reflecting surface does not necessarily need to be a mirror surface, and a surface of a material capable of reflecting incident light in the light exit direction is sufficient.

Referring to FIG. 8, when light emitted from each of the plurality of LEDs 123a and 123b of the first and second LED modules 120a and 120b is incident on the reflecting surface of the reflector 140, an image is formed on the reflecting surface. The eight outermost images of 141a and 141b draw the circumference 145. The remaining two phases are evenly distributed in the circumference 145. The eight images located at the outermost side may be positioned at a uniform distance on the circumference 145.

9 is another example in which the number of LEDs is increased in the lighting apparatus according to the embodiment of the present invention.

FIG. 9 shows that the arrangement of the LEDs arranged in the first LED module 120a illustrated in FIGS. 1 to 4 includes four LEDs in the first row and three LEDs in the second row. The same applies to the second LED module 120b. Therefore, the total number of LEDs of the first and second LED modules 120a and 120b is fourteen.

In the illuminating device shown in FIG. 9, like the illuminating device shown in FIG. 8, the 14 images 141a and 141b are uniformly distributed in the circumference 145, and the eight images located at the outermost portion are arranged in the circumference 145. To form.

As shown in FIGS. 8 to 9, the plurality of LEDs 123a and 123b of the first and second LED modules 120a and 120b are mirror surfaces of light emitted from each of the plurality of LEDs 123a and 123b. When the image is formed on the reflective surface of the phosphor reflector 140, the combined images are arranged to form a circle. Therefore, even if the first and second LED modules 120a and 120b are arranged to face each other, the light emitted from the lighting device of the present invention may form a circle on the irradiation surface. Detailed description thereof will be described later with reference to FIGS. 13A through 16C.

The optical sheet 150 collects or diffuses the light reflected by the reflecting surface of the reflector 140. That is, the optical sheet 150 may be an optical sheet for collecting light according to a designer's selection, and may be an optical sheet for diffusing light.

As shown in FIGS. 2 to 3, the optical plate 160 accommodates the optical sheet 150 to prevent the optical sheet 150 from being deformed by heat. In addition, the optical plate 160 prevents a user from directly seeing the light emitted from the LED 123a through the reflective cover member 180. This optical plate 160 will be described in detail with reference to FIGS. 3 and 10.

10 is a perspective view of the optical plate 160.

3 and 10, the optical plate 160 includes a first edge 161 for preventing the movement of the optical sheet 150, a second edge 163 and a second edge for mounting the optical sheet 150. It is fitted to the 163, the optical sheet 150 includes a glass plate 165 to prevent the bending in the light output direction by heat.

The first edge 161 has a structure that can surround each corner of the optical sheet 150, and has a predetermined width (D) from the outer end to the inner end.

The second edge 163 extends by a predetermined length toward the center of the optical plate 160 at the lower end of the inner end of the first edge 161 so that the optical sheet 150 can be seated.

The first and second edges 161 and 163 not only accommodate or fix the optical sheet 150, but also the connection member 170 and the user to receive the light emitted from the LED 123a to the reflective cover member 180. Prevents direct eye contact.

The glass plate 165 is fitted to the second edge 163 and prevents the optical sheet 150 from being bent in the light output direction by heat.

2, 3, and 10 illustrate the optical sheet 150 and the optical plate 160 as separate components, the function of the optical sheet 150 is applied to the glass plate 165 of the optical plate 160. May be included. That is, the optical plate 160 itself may collect or diffuse incident light.

The connection member 170 is coupled to the radiator 110 and the reflective cover member 180, respectively, so that the radiator 110 and the reflective cover member 180 are connected to each other. In addition, the optical plate 160 is accommodated, and the received optical plate 160 is fixed so as not to fall out of the reflective cover member 180. In addition, the connection member 170, together with the optical plate 160, prevents a user from directly seeing the light emitted from the LED 123a through the reflective cover member 180. 3 and 11 to look at the connecting member 170 in detail.

11 is a perspective view of the connection member 170.

3 and 11, when the optical member 160 accommodates the optical plate 160, the connection member 170 seats the third edge 171 and the optical plate 160 to prevent the optical plate 160 from moving. The plate 160 may include a fourth edge 173 that prevents the plate 160 from falling into the reflective cover member 180.

The third edge 171 is formed to surround the first edge 161 of the optical plate 160, each hole of the third edge 171 is a hole in which the first coupling screw 175 can be inserted Is formed. When the first coupling screw 175 is inserted into the holes formed at the corners of the third edge 171, the radiator 110 and the connection member 170 may be firmly fixed.

The fourth edge 173 extends by a predetermined length toward the center of the connection member 170 at the lower end of the inner end of the third edge 171 so that the first edge 161 of the optical plate 160 can be seated. . The fourth edge 173 extends by a predetermined length in the direction in which the fourth edge 173 is coupled to the reflective cover member 180.

The third and fourth edges 171 and 173 not only accommodate or fix the optical plate 160, but also prevent the user from directly seeing the light emitted from the LED 123a through the reflective cover member 180. You can stop it.

12 is a perspective view of the reflective cover member 180.

Referring to FIG. 12, the reflective cover member 180 is emitted from the first and second LED modules and reflected by the reflector 140, and then guides the light passing through the optical sheet 150 and the glass plate 165. The reflective cover member 180 prevents light passing through the optical sheet 150 and the glass plate 165 from spreading in all directions. That is, the reflective cover member 180 allows the light to be collected in a predetermined direction toward the downward direction.

The reflective cover member 180 is formed to surround the fourth edge 173 of the connection member 170 and the fifth edge 181 and the optical to tightly contact the reflective cover member 180 and the connection member 170. It includes a cover 183 for collecting the light passing through the sheet 150 and the glass plate 165 in the downward direction.

The fifth edge 181 and the fourth edge 173 may be more firmly coupled by the second coupling screw 185.

Cover 183 is a hollow cylindrical shape, the top and bottom are open. The radius of the upper surface is smaller than the radius of the lower surface, and the side surface has a predetermined curvature.

Hereinafter, the effect of the lighting device according to an embodiment of the present invention to be described through various experiments.

13A to 13C show data relating to the first experiment.

As shown in FIG. 13A, the first experiment uses a reflector 140 having a 96% specular reflectance and a focusing lens 129a having a 92% efficiency. In addition, the radiator 110 was used to have a diameter of 3 inches, and the substrates 121a and 121b of the first and second LED modules 120a and 120b were covered with white paint.

13B is a graph of luminous intensity of the first experiment.

Referring to FIG. 13B, it can be seen that the directing angle of the light emitted from the lighting apparatus of the first experiment is approximately 23 degrees, and the light is concentrated in the vertical direction (0 degrees).

13C is an illumination graph of the first experiment.

Referring to FIG. 13C, 10 dots are evenly distributed on the irradiated surface due to the characteristics of the arrangement of 10 LEDs, and the dots located at the outermost sides may show a circle. And it can be seen that the center of each dot reaches 600,000 lux (LUX).

As a result of the first experiment shown in FIGS. 13A to 13C, the efficiency of the lighting device of the first experiment was approximately 82%.

14A to 14C show data relating to the second experiment.

The second experiment is to add the optical sheet 150 for diffusing light to the first experiment shown in Figs. 13A to 13B.

14B is a graph of luminous intensity of the second experiment.

Referring to FIG. 14B, it can be seen that the directivity angle of the light emitted from the lighting device of the second experiment is approximately 30 degrees, and the light is concentrated in the vertical direction (0 degrees).

14C is an illumination graph of the second experiment.

Referring to FIG. 14C, 10 dots are evenly distributed on the irradiation surface due to the characteristics of the arrangement of the 10 LEDs, and the dots located at the outermost sides may show a circle. And the center of each dot can be seen that reaches 500,000 lux (LUX). When the second experiment was compared with the first experiment, it was confirmed that the second experiment was more diffused than the first experiment because the optical sheet 150 for diffusing the light was added.

As a result of the second experiment shown in FIGS. 14A to 14C, the efficiency of the lighting apparatus of the second experiment was about 75%, indicating that the efficiency was lower than that of the first experiment.

15A to 15C show data relating to the third experiment.

The third experiment further uses the optical sheet 150 for collecting light in the first experiment shown in FIGS. 13A to 13B.

15B is a graph of luminous intensity of the third experiment.

Referring to FIG. 15B, it can be seen that the directivity angle of the light emitted from the lighting apparatus of the third experiment is approximately 30 degrees, and the light is concentrated in the vertical direction (0 degrees).

15C is an illumination graph of the third experiment.

Referring to FIG. 15C, 10 dots are evenly distributed on the irradiated surface due to the characteristics of the arrangement of 10 LEDs, and the dots located at the outermost sides may show a circle. And the center of each dot can be seen that reaches 500,000 lux (LUX). In the third experiment, since the optical sheet 150 was added, it was confirmed that more light was collected than in the second experiment.

As a result of the third experiment illustrated in FIGS. 15A to 15C, the efficiency of the lighting apparatus of the third experiment was about 71%, indicating that the efficiency was lower than that of the first experiment.

16A to 16C show data relating to the fourth experiment.

In the fourth experiment, the optical plate 160 equipped with the glass plate 165 having the diffuser function is added to the first experiment shown in FIGS. 13A to 13B.

16B is a graph of luminous intensity of the fourth experiment.

Referring to FIG. 16B, it can be seen that the directing angle of the light emitted from the lighting apparatus of the fourth experiment is about 30 degrees, and the light is concentrated in the vertical direction (0 degrees).

16C is an illumination graph of the fourth experiment.

Referring to FIG. 16C, 10 dots are evenly distributed on the irradiated surface due to the characteristics of the arrangement of 10 LEDs, and the dots located at the outermost sides may show a circle. And the center of each dot can be seen that reaches approximately 450,000 lux (LUX). In the fourth experiment, since the glass plate 165 having the diffuser function was added, it was confirmed that light was more diffused than in the first experiment.

As a result of the fourth experiment illustrated in FIGS. 16A to 16C, the efficiency of the lighting apparatus of the fourth experiment was about 70%, indicating that the efficiency was lower than that of the first experiment.

110: heat sink, 110a: first heat sink, 110b: second heat sink
120a: first LED module, 120b: second LED module
130a: first fixing plate 130b: second fixing plate
140: reflector
150: optical sheet
160: optical plate
170: connecting member
180: reflective cover member

Claims (4)

First and second LED modules on which a plurality of LEDs are disposed on one surface of a substrate; And
A plurality of inner walls for dissipating heat from the plurality of LEDs and defining an accommodation space for accommodating the first and second LED modules therein, the other side of the substrate being at least one of the plurality of inner walls A first shape having a cylindrical shape, which is installed on one inner wall, each of which is integrally formed, and the outer shape of the combined body coupled to each other has an opening for outputting light emitted from the plurality of LEDs of the first and second LED modules. And a second heat sink; And
A reflector fixed inside the assembly and reflecting light emitted from the plurality of LEDs of the first and second LED modules into the opening;
Lighting device comprising a.
The method of claim 1,
A plurality of heat dissipation fins are formed on the upper and side surfaces facing the opening in the assembly, and the outermost circumference of the plurality of heat dissipation fins has a cylindrical shape.
N LED modules in which a plurality of LEDs are disposed on one surface of a substrate; And
A plurality of inner walls for dissipating heat from the plurality of LEDs and defining an accommodation space for accommodating the n LED modules therein, the other side of the substrate having an inner wall of at least one of the plurality of inner walls N heat sinks each of which is integrally formed and integrally coupled to each other, the outer shape of the combined body having a cylindrical shape having openings for emitting light emitted from the plurality of LEDs of the n LED modules;
A reflector fixedly installed inside the combination and reflecting light emitted from the plurality of LED furnaces of the n LED modules to the opening;
Lighting device comprising a.
The method of claim 3, wherein
A plurality of heat dissipation fins are formed on the upper and side surfaces facing the opening in the assembly, and the outermost circumference of the plurality of heat dissipation fins has a cylindrical shape.

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