KR20180010851A - down light - Google Patents

Abstract

A downlight having a replaceable light guide is provided. A downlight having a replaceable light guide according to an exemplary embodiment of the present invention includes: a holder; a heat sink rotatably coupled to the holder; an LED module including at least one LED for generating light and fixed to one surface of the heat sink; a storage member storing an optical lens and detachably coupled to the heat sink; and a light guide detachably coupled to the storage member and provided in a hollow shape having the predetermined length so as to condense light generated by the LED or prevent glare.

Description

Down light with replaceable light guide {down light}

The present invention relates to a lighting apparatus, and more particularly, to a down light embedded in a ceiling.

Generally, the illumination can be largely divided into indoor illumination and outdoor illumination. Among them, as an example of a lighting device for indoor lighting, a down light which is embedded in a ceiling of a building such as a living room or a museum is used.

Particularly, LED downlights, which are energy efficient and have a longer life than fluorescent lamps and incandescent lamps, are used as light sources.

Such a down light includes a housing having a storage space therein, an LED module provided inside the housing to generate light, and a light guide for collecting light generated by the LED according to the purpose of use.

However, in the conventional down light, when the light guide and the housing are integrated, it is inconvenient to purchase a separate down light having a suitable light guide when it is necessary to collect or spread the light according to the purpose of use.

Further, in order to separate the diffusion optical lens disposed in front of the LED in the conventional general down light, it is necessary to separate the diffusion optical lens module from the housing and then to separate the diffusion optical lens again. There is a problem.

KR 10-1050524 B1

SUMMARY OF THE INVENTION It is an object of the present invention to provide a downlight capable of replacing a light guide which can be easily replaced with a light guide of a suitable type according to the purpose of use.

Another object of the present invention is to provide a downlight capable of easily replacing an optical lens disposed on the front side of the LED module through a simple assembling structure and capable of replacing the optical guide.

In order to solve the above-mentioned problems, A heat sink rotatably coupled to the holder; An LED module including at least one LED for generating light and fixed to one surface of the heat sink; A housing member having an optical lens therein and detachably coupled to the heat sink; And a light guide detachably coupled to the receiving member, the light guide being provided in a hollow shape having a predetermined length so as to condense light generated by the LED or to prevent glare. do.

In addition, the receiving member may have an engagement portion formed on an inner surface thereof to protrude inwardly along the circumferential direction by a predetermined length, so as to support the edge of the optical lens.

In addition, an illuminating filter member for light generated by the LED is disposed inside the housing member, and the illuminating filter member is supported by the engaging portion and the end of the light guide when the housing member and the light guide are coupled .

In addition, a lighting filter member for light generated by the LED is disposed inside the light guide, and the light guide has a hook portion formed on the inner surface thereof so as to protrude a predetermined length inward along the circumferential direction, The optical lens and the illumination filter member can be supported by the engaging portion when the accommodating member and the light guide are coupled.

Further, the heat sink may include a first portion having at least one radiating fin and a second portion having a curved surface, and the curved surface of the second portion may be coupled to the holder.

In addition, the light guide may be formed at one end side at a predetermined slope with respect to the longitudinal direction.

The ratio of the diameter and the maximum length of the light guide may satisfy the following range. 0.7? L / D? 1.19 (where L is the maximum length of the light guide and D is the diameter of the light guide)

In addition, a hollow airtight member may be disposed on the contact surface of the holder and the heat sink.

In addition, the heat sink may be formed with a receiving groove which is drawn inwardly from one surface to a certain depth so as to accommodate a length of the receiving member.

Further, the heat sink may have a hollow protrusion protruding outward from one surface thereof, and one end of the housing member may be detachably coupled to the protrusion.

According to the present invention, it is possible to easily change the light guide of a suitable shape according to the purpose of use, thereby preventing glare and producing various lights, thereby improving the usability.

Further, since the optical lens disposed on the front side of the LED module can be replaced, maintenance is easy.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an external view showing a form of a downlight capable of replacing a light guide according to the present invention;
FIG. 2 is a sectional view of FIG. 1,
Fig. 3 is a sectional view of Fig. 1,
FIG. 4 is an external view showing another embodiment of a downlight capable of replacing a light guide according to the present invention.
FIG. 5 is an illustration of the separation of FIG. 4,
Fig. 6 is a sectional view of Fig. 4,
FIG. 7 is a view showing various forms of a light guide applied to a downlight capable of replacing a light guide according to the present invention,
8 is an explanatory diagram for deriving a relationship between a maximum length of a light guide and a diameter of a light guide in a light guide applied to a down light capable of replacing the light guide according to the present invention,
FIG. 9 is an external view showing another embodiment of a downlight capable of replacing a light guide according to the present invention. FIG.
10 is a sectional view of Fig. 9,
Fig. 11 is an external view showing a state in which an adapter member is applied to Fig. 10,
Fig. 12 is a sectional view of Fig. 11,
13 is a view showing another form of the light guide applied to Fig. 12, Fig.
FIG. 14 is an external view of another embodiment of a downlight capable of replacing a light guide according to the present invention;
Fig. 15 is a sectional view of Fig. 14,
FIG. 16 is a cross-sectional view showing a state in which a light guide is coupled to FIG. 14,
17 is a modification of Fig.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art to which the present invention pertains. The present invention may be embodied in many different forms and is not limited to the embodiments described herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and the same reference numerals are assigned to the same or similar components throughout the specification.

- First Embodiment

1 to 6, the downlights 100 and 100 'capable of replacing the light guide according to the first embodiment of the present invention include the holders 110 and 210, the heat sinks 120 and 220, the LED module 130, (140, 240) and a light guide (150, 250).

The holders 110 and 210 are for fixing the downlights 100 and 100 'according to the present invention to a mounting surface (for example, a ceiling). The holders 110 and 210 may include hollow bodies 112 and 212 having upper and lower openings to allow the heat sinks 120 and 220 to be inserted therein. A wing portion 114 protruding outward from the main body 112 and 212 may be formed along the direction of the wing.

Accordingly, the holders 110 and 210 can be fixed to the mounting surface by inserting the wings 114 into the mounting holes formed on the mounting surfaces of the main bodies 112 and 212 with a predetermined area, and by inserting the wings 114 on the mounting surfaces.

At this time, the holder 110 is formed such that the nut member 116 screwed to the main body 112 is brought into contact with the opposite surface of the mounting surface through which the wing portion 114 is inserted, (See FIGS. 1 to 3), a pair of fixing portions 216 pivotally coupled to the main body 212 may be provided on the opposite side of the mounting surface where the wing portion 114 is contacted, So that it can be prevented from being disengaged from the installation hole (refer to Figs. 4 to 6).

The heat sinks 120 and 220 are for releasing heat generated from the LED module 130 to the outside and may be detachably coupled to the holders 110 and 210 in a state where the LED module 130 is disposed on one side. have.

For this purpose, the heat sinks 120 and 220 may be formed of a metal having excellent thermal conductivity in consideration of heat dissipation performance. For example, the heat sinks 120 and 220 may be formed of aluminum or an aluminum alloy.

In this case, the heat sinks 120 and 220 are rotatably coupled to the holders 110 and 210, thereby adjusting the direction of the light emitted from the LED module 130 and emitted to the outside.

The heat sinks 120 and 220 may include first portions 121 and 221 having at least one heat radiating fin 123 and second portions 122 and 222 having curved surfaces. May be coupled to the holders 110 and 210 (see FIGS. 3 and 6).

That is, the second portions 122 and 222 are inserted into the hollow portions of the holders 110 and 210, and the curved portions directly contact the inner surfaces of the holders 110 and 210, so that the heat sinks 120 and 220 are inserted into the holders 110 and 210 And can be freely rotated in the forward, backward, left, and right directions by the curved surface in the inserted state.

The heat sink 120 may be formed such that the curved surface of the second portion 122 is in direct contact with the inner surface of the main body 112 of the holder 110, To the side of the extension portion 218 protruding a predetermined length inward along the direction of the arrow. Here, the first portions 121 and 221 and the second portions 122 and 222 may be integrally formed, but may be detachably coupled.

The heat radiating fins 123 may protrude outward from the body of the first portions 121 and 221 so as to increase the heat radiation efficiency of the heat sinks 120 and 220. The height direction of the first portions 121 and 221 And a plurality of them may be spaced apart. That is, by enlarging the contact area with the outside air through the radiating fin 123, the heat radiating area is widened, so that the heat radiating performance can be improved.

A hermetic member 180 such as an O-ring is disposed on the contact surfaces of the heat sinks 120 and 220 and the holders 110 and 210 so that the heat sinks 120 and 220 are rotated by the hermetic member 180 when the heat sinks 120 and 220 are rotated relative to the holders 110 and 210. [ A smooth rotation is achieved and the position changed by rotation can be fixed so as not to change. For example, the hermetic member 180 may be made of a rubber material having elasticity.

The LED module 130 includes a circuit board 132 disposed on one side of the heat sinks 120 and 220 and at least one LED 134 mounted on the circuit board 132.

At this time, the circuit board 132 may be attached to one surface of the heat sinks 120 and 220 via a fastening member such as a bolt member, or may be attached via a bonding member such as a double-sided tape having thermal conductivity. Accordingly, the heat generated during the light emission of the LED 134 is transmitted to the heat sinks 120 and 220 through the circuit board 132, thereby being easily discharged to the outside. The circuit board 132 is inserted into at least one cable arrangement hole 124 formed in the height direction of the heat sinks 120 and 220, The cable 10 can be supplied with power.

The housing members 140 and 240 are hollow and have a predetermined length, and one side of the housing member 140 is detachably coupled to the heat sinks 120 and 220.

At this time, the accommodating members 140 and 240 may be partially inserted into the heat sink 120, and may have a protrusion 226 protruding from the one surface of the heat sink 220 by a predetermined length It may also be in a combined form.

3, the heat sink 120 may be formed such that a portion of the second portion 122 protrudes downward from one surface of the first portion 121 to which the LED module 130 is fixed The entire part of the receiving member 140 is formed on one side of the first portion 121 and on the side of the receiving groove 126 formed by the inner surface of the second portion 122 protruded from one surface of the first portion 121 A portion of the length may be inserted to engage the outer surface of the receiving member 140 with the inner surface of the second portion 122. [

As another example, the heat sink 220 may have a hollow protrusion 226 extending from the lower edge of the second portion 222 downward to a predetermined length, as shown in FIG. 6, And the inner surface of the receiving member 240 are coupled to each other.

The housing member 140 and 240 may accommodate the optical lens 160 such that the optical lens 160 is positioned on the front side of the LED 134. [

The optical lens 160 is disposed at a position corresponding to the LED 134 to concentrate or diffuse the light generated by the LED 134 to control the light distribution.

The illuminating filter member 170 may be disposed on the front side of the optical lens 160 for various effects of the light emitted from the LED 134. The illuminating filter member 170 may be disposed on the front side of the optical lens 160, 250 may be disposed inside or within the light guides 150 and 250 when the illumination filter member 170 is disposed in the light guides 150 and 250, And may be disposed at either one of the opposite ends of the light guide 150 or 250. [

Here, the illumination filter member 170 may perform various functions such as diffusing the light generated from the LED, reducing the amount of light to prevent glare, or softening the light. For example, the illumination filter member 170 may be a known glass filter or a known mesh screen such as a light block screen.

Accordingly, the downlights 100 and 100 'according to the present invention can smoothly emit light or reduce the brightness of light through the illuminating filter member 170, thereby making it possible to produce various effects and colors and adjust the amount of light according to the use environment.

At this time, the optical lens 160 can be prevented from deviating to the outside through the engaging portions 142 and 152 in a state where the optical lens 160 is disposed inside the accommodating members 140 and 240.

In this embodiment, the engaging portions 142 and 152 may be formed on the inner side of the receiving member 140 or 240 or the light guide 150 or 250. [

For example, the latching portion 142 may protrude from the inner surface of the receiving member 140 by a predetermined length in the circumferential direction (see FIG. 3). The optical lens 160 is received in the housing member 140 when the housing member 140 and the heat sink 120 are coupled to each other, And can be prevented from being released to the outside. Therefore, when the optical lens 160 is to be replaced, if the housing member 140 is detached from the heat sink 120, the optical lens 160 can be easily separated from the outside, .

In addition, when the locking part 142 is formed on the inner surface of the receiving member 140, the lighting filter member 170 may be disposed on the opposite side of the optical lens 160 from the locking part 142 have. When the receiving member 140 and the light guide 150 are coupled to each other, the illuminating filter member 170 is disposed between the engaging part 142 and the end of the light guide 150, And the end of the light guide 150, thereby preventing the receiving member 140 from being separated from the outside or being separated from the outside by fastening and separating the light guide 150.

As another example, the latching part 152 may protrude from the inner surface of the light guide 150 along the circumferential direction for a predetermined length (see FIG. 6). The optical lens 160 is received in the receiving member 240 when the receiving member 240 and the optical guide 250 are coupled with each other, 152 to be prevented from being released to the outside. Therefore, when the optical lens 160 is to be replaced, the optical lens 160 can be easily separated from the optical lens 160 by separating the optical guide 250 from the housing member 240 .

In addition, if the latching part 152 is formed on the inner surface of the light guide 250, the latching part 152 may be spaced downwardly from the end of the latching part 152 which is fastened to the receiving member 240, The illuminating filter member 170 may be disposed between the engaging portion 152 and the optical lens 160 (see FIG. 6). When the receiving member 240 and the light guide 250 are coupled to each other, the edge of the illuminating filter member 170 is supported by the engaging portion 152, The detachable member 170 can be prevented from being released to the outside. When the optical lens 160 and / or the illumination filter member 170 are required to be replaced, the optical guide 250 is separated from the housing member 240 and the optical lens 160 and / 170 can be easily replaced by releasing the restraining force.

The light guides 150 and 250 are hollow and open at both ends with a predetermined length, and are connected to the receiving members 140 and 240.

The light guides 150 and 250 guide the path of light generated by the LEDs 134 and collect light. In addition, the light guides 150 and 250 have a predetermined length and are connected to the receiving members 140 and 240, so that light emitted from the LEDs 134 can be prevented from being directly emitted to a wide range. The downlights 100 and 100 'according to the present invention are configured such that the angle of emission of the light generated by the LEDs 134 is limited through the light guides 150 and 250 so that a person positioned around the downlights 100 and 100' It can prevent the snow from bruising.

At this time, the light guides 150 and 250 may be detachably coupled to the receiving members 140 and 240. Accordingly, the light guides 150 and 250 having various lengths can be easily replaced according to the installation place and use of the down lights 100 and 100 'according to the present invention, so that the light guides 150 and 250 can be flexibly coped with the purpose of use or installation place. When the optical lens 160 and / or the illumination filter member 170 are required to be replaced as described above, the optical guide 160 and / or the illumination filter 160 can be separated by separating the optical guides 150 and 250 from the receiving members 140 and 240. [ The member 170 can be easily replaced.

 For example, threaded portions corresponding to the light guides 150 and 250 and the receiving members 140 and 240 may be detachably coupled to each other by screwing them. However, the coupling structure of the light guides 150 and 250 and the receiving members 140 and 240 is not limited thereto, and various known attachment and detachment methods such as an indentation method and the like can be applied.

The maximum length L of the optical guides 150 and 250 may be 0.7 to 1.19 times the diameter D of the optical guides 150 and 250. [

This is to minimize the glare caused by the light emitted from the ends of the light guides 150 and 250 when a person around the down lights 100 and 100 'is raised at a predetermined angle with respect to the horizontal plane in order to observe the exhibition objects or objects on the front side .

Normally, when viewing a forward object located at a relatively higher position than a human eye, a person can see the object in a relaxed state when the viewing angle is upward from 35 degrees to 50 degrees.

In the present invention, when the maximum length L of the light guide is set to 0.7 to 1.19 times the diameter D of the light guides 150 and 250, even if the user looks upwards from 35 degrees to 50 degrees, It is confirmed that the glare caused by the light emitted from the light guides 150 and 250 is minimized.

This is because the angle? Of the eye of the person looking upward with respect to the horizontal plane, the vertical distance h 'from the end of the light guides 150 and 250 to the eye level, Can be derived using the trigonometric function and the similarity ratio from the correlation between the central axis of the guide and the horizontal distance (x ') to the human eye (see FIG. 8).

Specifically, when the downlights 100 and 100 'are manufactured in a small size, the vertical distance h' from the end of the light guides 150 and 250 to the human eye level is from the eye level of the person to the ceiling where the downlights 100 and 100 ' And the horizontal distance x 'from the central axis of the light guide to the human eye is assumed to be equal to the horizontal distance x from the outer surface of the light guide to the human eye .

로 표현될 수 있다.From this relationship, it is possible to derive the relational expression of the maximum length L of the light guide required = h x D / x. At this time, h / x =

. ≪ / RTI >

In order to minimize the glare caused by light emitted from the light guides 150 and 250 even if the person looks upwards from 35 degrees to 50 degrees from this relationship, the maximum length L of the light guide may be smaller than the diameter of the light guides 150 and 250 It should be set to have a magnitude of 0.7 to 1.19 times as large as the diameter D of the light guide plate.

Meanwhile, the light guides 150 'and 250' applied to the present invention may be formed so that one end side has a predetermined slope with respect to the longitudinal direction (see FIG. 7). Accordingly, the light emitted from the LED 134 can be emitted directly through the incision so that light can be emitted to a wider area forward of the incision. For example, the downlights 100 and 100 'according to the present invention are installed such that the incisions are directed toward the exhibition side disposed at the front, thereby illuminating the space between the downlights 100 and 100' '), The irradiation range may be limited by the light guides 150 and 250 in the rear direction.

- Embodiment 2

9 to 13, the downlights 200 and 200 'capable of replacing the light guide according to the second embodiment of the present invention include a holder 310, a heat sink 320, an LED module 130, (340) and a light guide (350).

The holder 310 is for fixing the downlights 200 and 200 'according to the present invention to an installation surface (for example, a ceiling). The holder 310 may include a hollow main body 312 having upper and lower openings to allow the heat sink 320 to be inserted therein. A wing portion 314 protruding outward from the main body 312 may be formed.

Accordingly, the main body 312 can be fixed to the mounting surface by inserting the wing portion 314 into the mounting hole formed in a predetermined area on the mounting surface, and by inserting the wing portion 314 into the mounting surface.

At this time, the holder 310 supports a pair of fixing portions 316, which are rotatably coupled to the main body 312, by an elastic force to the opposite surface of the mounting surface where the wing portions 314 are contacted, The deviation from the ball can be prevented (see Figs. 9 and 11).

In addition, the structure of FIG. 1 in which the holder 310 is prevented from being separated from the installation hole through a nut member screwed to the main body 312 may be employed.

The heat sink 320 discharges the heat generated from the LED module 130 to the outside.

For this purpose, the heat sink 320 may be formed of a metal having excellent thermal conductivity in consideration of heat radiation performance. For example, the heat sink 320 may be formed of aluminum or an aluminum alloy.

The heat sink 320 may be detachably coupled to the holder 310 in a state where the heat sink 320 is fastened to the housing member 340.

The heat sink 320 fastened to the receiving member 340 is rotatably coupled to the holder 310 to adjust the direction of light emitted from the LED module 130 and emitted to the outside.

The heat sink 320 may include a first portion 321 having at least one heat radiating fin 123 and a second portion 322 coupled to the receiving member 340, A portion of the portion 322 may be formed as a curved surface. Here, the receiving member 340 coupled to the second portion 322 may be formed to include a curved surface, and may be formed to have the same curved surface as the curved surface formed on the second portion 322 (see FIG. 10) ).

Accordingly, when the second portion 322 and the receiving member 340 are coupled, the curved portions are connected to each other to form a substantially spherical shape, and the second portion 322 and the receiving member 340 are connected to each other The holder 310 can be inserted into the hollow portion of the holder 310. [ At this time, since the curved surface portion is in direct contact with the inner surface of the holder 310, the second portion 322 of the heat sink 320 and a part of the housing member 340 are inserted into the holder 310 And can be freely rotated in the forward, backward, left, and right directions by the curved surface.

The heat dissipation fins 123 may protrude outward from the body of the first portion 321 so as to increase the heat radiation efficiency of the heat sink 320. The height direction of the first portion 321 may be defined as And a plurality of them may be spaced apart. That is, by enlarging the contact area with the outside air through the radiating fin 123, the heat dissipating area is widened, so that the heat dissipating performance can be improved (see FIG. 10).

A hermetic member 180 such as an O-ring may be disposed on the contact surface between the housing member 340 and the holder 310. The hermetic member 180 is rotated by the hermetic member 180 when the housing 310 and the heat sink 320 are rotated with respect to the holder 310, Can be fixed so as not to be changed. For example, the hermetic member 180 may be made of a rubber material having elasticity.

The LED module 130 includes a circuit board 132 disposed on one side of the heat sink 320 and at least one LED 134 mounted on the circuit board 132.

At this time, the circuit board 132 may be attached to one side of the heat sink 320 via a fastening member such as a bolt member, or may be attached via a bonding member such as a double-sided tape having thermal conductivity. Accordingly, the heat generated when the LED 134 emits light is transmitted to the heat sink 320 through the circuit board 132, so that it can be easily discharged to the outside. The circuit board 132 may be inserted into at least one cable arrangement hole 124 formed in the height direction of the heat sink 320, The cable 10 can be supplied with power.

The housing member 340 includes a receiving portion 342 having an internal space in which the optical lens 160 is disposed and a fastening portion 344 fastened to the second portion 322 of the heat sink 320 And is detachably coupled to the heat sink 320 through the coupling part 344.

The coupling portion 344 may have a curved outer surface to allow the coupling portion 344 to rotate in the forward, backward, left, and right directions with respect to the holder 310 when coupled with the holder 310, as described above.

For example, the coupling portion 344 may be coupled to the second portion 322 of the heat sink 320 so as to surround the heat sink 320 by being provided in a hollow shape protruding upward from the receiving portion 342 by a predetermined length.

Thread portions corresponding to the inner surface of the coupling portion 344 and the outer surface of the second portion 322 may be respectively formed and screwed together.

The housing member 340 may accommodate the optical lens 160 so that the optical lens 160 may be positioned on the front side of the LED 134.

The optical lens 160 is disposed at a position corresponding to the LED 134 to concentrate or diffuse the light generated by the LED 134 to control the light distribution.

At this time, the optical lens 160 may be prevented from deviating to the outside through the latching part 352 in a state where the optical lens 160 is disposed inside the accommodating part 342.

For this purpose, the latching part 352 may be formed to protrude inwardly along the circumferential direction on the inner surface of the light guide 350 (see FIG. 10). The optical lens 160 is held by the receiving portion 342 when the receiving member 340 and the optical guide 350 are coupled to each other so that the lower edge of the optical lens 160 is coupled to the coupling portion 352 So that the deviation to the outside can be prevented. Therefore, if the optical lens 160 needs to be replaced, the optical lens 160 can be separated from the optical fiber 160 by separating the optical guide 350 from the housing member 340, Can be replaced.

The light guide 350 is hollow and has a predetermined length and is open at both ends, and is connected to the receiving member 340.

The light guide 350 guides the path of the light generated by the LED 134 and collects the light. In addition, the light guide 350 may have a predetermined length and may be connected to the receiving member 340 to limit light emitted from the LED 134 to a wide range immediately. Accordingly, the downlight 200 and 200 'according to the present invention can prevent a person located around the downlights 200 and 200' from being disturbed by the light by limiting the emission angle of the light generated from the LEDs 134 through the light guide 350 It can prevent the snow from bruising.

At this time, the light guide 350 may be detachably coupled to the receiving member 340. Accordingly, the light guide 350 having various lengths can be easily replaced according to the installation place and use of the downlights 200 and 200 'according to the present invention, so that the light guide 350 can be flexibly coped with the purpose of use or installation place. In addition, when the optical lens 160 needs to be replaced as described above, the optical lens 160 can be easily replaced by separating the light guide 350 from the housing member 340. [

For example, threaded portions corresponding to the inner surface of the light guide 350 and the outer surface of the receiving member 340 may be respectively formed and screwed to be detachably coupled. However, the coupling structure of the light guide 350 and the housing member 340 is not limited thereto, and various known attachment and detachment methods such as an indentation method can be applied.

The illuminating filter member 170 may be disposed on the front side of the optical lens 160 for various effects of the light emitted from the LED 134. The illuminating filter member 170 may be disposed on the front side of the optical lens 160, The illumination filter member 170 may be disposed in the middle of the length of the light guide 350 or may be disposed at either one of the opposite ends of the light guide 350 .

For example, the illumination filter member 170 may be disposed at one end of the light guide 350 (see FIG. 10), and may be a hollow support member detachably coupled to the end of the light guide 350 And the rim side is supported by the ribs 172.

However, the position of the illuminating filter member 170 is not limited thereto. As described in the first embodiment, the light guide 350 may have an engagement portion formed on the inner surface thereof at a predetermined distance from the end portion thereof, 170 are supported by the latching portions (see FIG. 6).

Here, the illumination filter member 170 may perform various functions such as diffusing the light generated from the LED, reducing the amount of light to prevent glare, or softening the light. For example, the illumination filter member 170 may be a known glass filter or a known mesh screen such as a light block screen.

Accordingly, the downlights 200 and 200 'according to the present invention can smoothly emit light or reduce the brightness of light through the illuminating filter member 170, thereby making it possible to produce various effects and colors and adjust the amount of light according to the use environment.

The maximum length L of the light guide 350 may be 0.7 to 1.19 times the diameter D of the light guide 350.

This is to minimize the glare caused by the light emitted from the end of the light guide 350 when a person around the down lights 200 and 200 'is raised at a predetermined angle with respect to the horizontal plane in order to observe the exhibit or object on the front side (See FIG. 8).

In addition, the light guide 350 'applied to the present invention may be formed in such a manner that a cut portion having one end side has a predetermined slope with respect to the longitudinal direction (see FIG. 13).

Here, the correlation between the maximum length L of the light guide and the diameter D of the light guide, and the effect of the cutout portion are the same as those of the first embodiment described above, and thus a detailed description thereof will be omitted.

The downlights 200 and 200 'according to the second embodiment of the present invention may include an adapter member 190 disposed between the light guide 350 and the receiving member 340 13).

That is, the adapter member 190 has one end coupled to the light guide 350 and the other end detachably coupled to the receiving member 340 to interconnect the light guide 350 and the receiving member 340 Can play a role.

For example, the adapter member 190 may be provided in the form of a hollow tube having a predetermined length, and fastening means for fastening the light guide 350 and the receiving member 340 may be formed on both end sides thereof And the fastening means may be a threaded portion corresponding to the threaded portion formed in the light guide 350 and the receiving member 340, respectively.

At this time, the adapter member 190 may have a latching portion 192 protruding inwardly along the circumferential direction on the inner surface thereof (see FIGS. 12 and 13).

The coupling member 192 formed on the adapter member 190 can support the lower edge of the optical lens 160 by fastening the adapter member 190 and the housing member 340 . In other words, the latching part 192 formed on the adapter member 190 has the same function as the latching part 352 formed on the inner surface of the light guide 350 described above.

Even if the light guide 350 fastened to the end of the adapter member 190 is separated from the adapter member 190, the optical lens 160 is supported by the fastening portion 352 formed on the adapter member 190, The detachment of the light guide 350 from the adapter member 190 can be freely performed.

Therefore, when the light guide 350 needs to be replaced according to the installation place or the use purpose, only the light guide 350 is easily separated from the adapter member 190, and another light guide to be used is simply fastened, can do.

 In addition, when the adapter member 190 is applied to the downlights 200 and 200 'capable of replacing the light guide according to the present invention, the maximum length L of the light guide, which is related to the diameter D of the light guide, And the length of the adapter member 190 together with the length of the adapter member 190.

- Third Embodiment

The downlights 300 and 300 'capable of replacing the light guide according to the third embodiment of the present invention are formed by a holder 310, a heat sink 320, an LED module 130, (440, 440 ').

The holder 310 is for fixing the downlights 300 and 300 'according to the present invention to a mounting surface (for example, a ceiling). The holder 310 may include a hollow main body 312 having upper and lower openings to allow the heat sink 320 to be inserted therein. A wing portion 314 protruding outward from the main body 312 may be formed.

Accordingly, the main body 312 can be fixed to the mounting surface by inserting the wing portion 314 into an installation hole (not shown) formed on the mounting surface with a predetermined area, and by inserting the wing portion 314 into the mounting surface.

At this time, the holder 310 supports a pair of fixing portions 316, which are rotatably coupled to the main body 312, by an elastic force to the opposite surface of the mounting surface where the wing portions 314 are contacted, The deviation from the ball can be prevented (see Fig. 14). In addition, the structure of FIG. 1 in which the holder 310 is prevented from being separated from the installation hole through a nut member screwed to the main body 312 may be employed.

The heat sink 320 discharges the heat generated from the LED module 130 to the outside.

For this purpose, the heat sink 320 may be formed of a metal having excellent thermal conductivity in consideration of heat radiation performance. For example, the heat sink 320 may be formed of aluminum or an aluminum alloy.

The heat sink 320 may be detachably coupled to the holder 310 while being coupled to the receiving members 440 and 440 '.

At this time, the heat sink 320 fastened to the receiving members 440 and 440 'is rotatably coupled to the holder 310, so that the direction of the light generated from the LED module 130 can be adjusted.

To this end, the heat sink 320 may include a first portion 321 having at least one heat radiating fin 123 and a second portion 322 coupled to the receiving member 440 and 440 ' 2 part 322 may be formed as a curved surface. Here, the receiving members 440 and 440 'fastened to the second portion 322 may also be formed to include curved surfaces and have the same curved surfaces as the curved surfaces formed on the second portions 322 Reference).

Accordingly, when the second portion 322 and the receiving member 440 and 440 'are fastened together, the curved portions are connected to each other to form a substantially spherical shape, and the second portion 322 and the receiving member 440 and 440' And may be inserted into the hollow portion of the holder 310 in a state where they are engaged with each other. At this time, the second portion 322 of the heat sink 320 and the part of the receiving member 440 and 440 ', which are coupled to each other by the direct contact of the curved surface portion with the inner surface of the holder 310, Rearward, leftward and rightward directions by the curved surface in a state in which the front surface is in a state of being rotated.

The heat dissipation fins 123 may protrude outward from the body of the first portion 321 so as to increase the heat radiation efficiency of the heat sink 320. The height direction of the first portion 321 may be defined as And a plurality of them may be spaced apart. That is, by increasing the contact area with the outside air through the radiating fin 123, the heat dissipating area is widened, so that the heat dissipating performance can be improved (refer to FIG. 15).

A hermetic member 180 such as an O-ring may be disposed on the contact surface between the housing member 440 and 440 'and the holder 310. The hermetic member 180 is rotated by the hermetic member 180 when the heat sink 320 and the housing member 440 and 440 'coupled to the holder 310 are rotated, The position can be fixed so as not to be changed. For example, the hermetic member 180 may be made of a rubber material having elasticity.

The LED module 130 includes a circuit board 132 disposed on one side of the heat sink 320 and at least one LED 134 mounted on the circuit board 132.

At this time, the circuit board 132 may be attached to one side of the heat sink 320 via a fastening member such as a bolt member, or may be attached via a bonding member such as a double-sided tape having thermal conductivity. Accordingly, the heat generated when the LED 134 emits light is transmitted to the heat sink 320 through the circuit board 132, so that it can be easily discharged to the outside. The circuit board 132 may be inserted into at least one cable arrangement hole 124 formed in the height direction of the heat sink 320, The cable 10 can be supplied with power.

The housing member 440 and 440 'accommodates the optical lens 160 coupled to the heat sink 320 and disposed in front of the LED 134 and guides the path of light generated by the LED 134 And to concentrate it.

The optical lens 160 is disposed at a position corresponding to the LED 134 to concentrate or diffuse the light generated by the LED 134 to control the light distribution.

The accommodating members 440 and 440 'may include a receiving portion 441 having an internal space in which the optical lens 160 is disposed, a fastening portion 442 fastened to the second portion 322 of the heat sink 320, And a hollow guide portion 443 extending downward from the receiving portion 441 by a predetermined length and may be detachably coupled to the heat sink 320 through the coupling portion 442 .

For example, the receiving portion 441 and the coupling portion 442 may be hollow, and the coupling portion 442 may extend upward from the end of the receiving portion 441 in which the optical lens 160 is received And may be coupled to enclose the second portion 322 of the heat sink 320 by a predetermined length.

The inner surface of the coupling portion 442 and the outer surface of the second portion 322 may be formed with threaded portions corresponding to each other and may be threadedly coupled to the hollow portion of the coupling portion 442, (130) may be disposed.

The coupling portion 442 and the receiving portion 441 are formed so that the outer surface is curved so as to be rotatable in the forward, backward, left, and right directions with respect to the holder 310 when the holder 310 is coupled with the holder 310, As shown in FIG.

Meanwhile, the optical lens 160 may be inserted into the coupling part 442 to prevent the optical lens 160 from being released to the outside in a state where the optical lens 160 is disposed in the receiving part 441.

To this end, the receiving members 440 and 440 'have a step portion 444 formed on the inner surface thereof, thereby restricting the moving direction of the optical lens 160 inserted into the receiving members 440 and 440'.

For example, the accommodating members 440 and 440 'are provided such that the inner diameter of the accommodating portion 441 and the inner diameter of the guide portion 443 extending downward from the accommodating portion 441 by a predetermined length have different diameters, The stepped portion 444 can be formed by forming the inner surface of the portion 441 and the inner surface of the guide portion 443 so as to be stepped with respect to each other. Preferably, the inside diameter of the accommodating portion 441 may be larger than the inside diameter of the guide portion 443 (see FIG. 15).

Accordingly, when the optical lens 160 is inserted into the receiving member 440 and 440 ', the edge of the optical lens 160 is supported by the end portion of the guide portion 443, Movement can be constrained.

Accordingly, when the optical lens 160 needs to be replaced, the housing member 440 and 440 'are separated from the heat sink 320, so that the optical lens 160 inserted into the housing members 440 and 440' The optical lens 160 can be replaced by being able to be released to the outside through the open end of the optical lens 442.

The guide part 443 is hollow and has both ends opened. The guide part 443 may extend a predetermined length in one direction from the end of the receiving part 441.

The guide part 443 guides the path of the light generated by the LED 134 and concentrates the light. In addition, the guide portion 443 has a predetermined length and is extended from the receiving portion 441 in which the optical lens 160 is accommodated, so that light emitted from the LED 134 is prevented from being directly emitted to a wide range . Accordingly, the downlight 300 or 300 'according to the present invention is configured such that the angle at which the light emitted from the LED 134 is emitted through the guide portion 443 is limited, whereby a person positioned around the downlights 300 and 300' It can prevent the snow from bruising.

The illuminating filter member 170 may be disposed on the front side of the optical lens 160 for various effects of the light emitted from the LED 134. The illuminating filter member 170 may be disposed on the front side of the optical lens 160, The illuminating filter member 170 may be disposed in the middle of the length of the guide portion 443 or may be disposed on the end side of the guide portion 443.

For example, the illumination filter member 170 may be disposed on an end side of the guide portion 443 (refer to FIG. 15), and a hollow support member And the rim side is supported by the ribs 172.

Here, a separate latching portion 443a for limiting the insertion depth of the illumination filter member 170 and supporting the illumination filter member 170 may be formed at the end of the guide portion 443.

For example, the latching portion 443a is formed on the inner surface of the guide portion 443 to protrude inwardly along the circumferential direction for a predetermined length, so that the latching portion 443a is inserted into the end portion of the guide portion 443, The position of the illumination filter member 170 can be fixed.

However, the position of the illuminating filter member 170 is not limited to this, and the illumination filter member 170 may be received in the accommodating portion 441 so that the stepped portion formed on the inner surface of the accommodating members 440 and 440 ' And the illumination filter member 170 disposed in front of the optical lens 160 through the step portion 444 is supported through the step portion 444. [

Here, the illumination filter member 170 may perform various functions such as diffusing the light generated from the LED, reducing the amount of light to prevent glare, or softening the light. For example, the illumination filter member 170 may be a known glass filter or a known mesh screen such as a light block screen.

Accordingly, the downlights 300 and 300 'according to the present invention can smoothly emit light or reduce the brightness of light through the illumination filter member 170, thereby making it possible to produce various effects and colors and adjust the amount of light according to the use environment.

The guide portion 443 may have a maximum length L of 0.7 to 1.19 times the diameter D of the guide portion 443.

This is to minimize the glare caused by the light emitted from the end of the guide portion 443 when a person around the down lights 300 and 300 'is raised at a predetermined angle with respect to the horizontal plane in order to see the exhibition object or object in front (See FIG. 8).

In addition, the accommodating member 440 'applied to the present embodiment may be formed so that one end of the guide portion 443 is formed with a cut portion having a predetermined slope with respect to the longitudinal direction (see FIG. 17).

Here, the correlation between the maximum length L of the guide portion and the diameter D of the guide portion, and the effect of the cutout portion are the same as those of the first embodiment, and therefore, detailed description thereof will be omitted.

Meanwhile, in the present embodiment, the guide part 443 may be detachably coupled with a separate light guide 450 having a predetermined length on the end side (see FIG. 16). Here, the light guide 450 plays the same role as the guide part 443.

Accordingly, the down light 300 according to the present invention can easily attach or remove the light guide 450 having various lengths, thereby flexibly adjusting the overall length guiding the light traveling direction according to the purpose of use or installation place .

The light guide 450 has an engaging portion 452 protruding inwardly along the circumferential direction on its inner surface so that the engaging portion 452 is disposed on the end side of the guide portion 443 when engaged with the guide portion 443, It is possible to support the rim of the filter member 170 to prevent the illumination filter member 170 from being deviated to the outside.

In addition, the light guide 450 may have a cylindrical shape having the same maximum length, or may have a shape in which one end side is formed so as to have a predetermined slope with respect to the longitudinal direction.

In the present embodiment, when a separate light guide 450 is further coupled to the end of the guide portion 443, the maximum length L of the guide portion, which is related to the diameter D of the guide portion, And the maximum length of the light guide 450 along with the length of the light guide 450.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

100,100 ', 200,200', 300,300 ': Downlight with replaceable light guide
110, 210, 310: Holders 112, 212, 312:
114, 114: wing portion 116: nut member
216, 166: Fixing portion 218: Extension portion
120, 220, 320: heat sink 121, 221, 321:
122, 222, 322: second part 123:
124: cable arrangement hole 126: receiving groove
226: protrusion 130: LED module
132: circuit board 134: LED
140, 240, 340, 440, 440 ': Housing member 150, 250, 350, 450:
152, 352, 452: engaging portion 160: optical lens
170: illumination filter member 180: airtight member
190: Adapter member 192:

Claims (10)

holder;
A heat sink rotatably coupled to the holder;
An LED module including at least one LED for generating light and fixed to one surface of the heat sink;
A housing member having an optical lens therein and detachably coupled to the heat sink; And
And a light guide detachably coupled to the receiving member, the light guide having a predetermined length so as to condense light generated by the LED or to prevent glare. The method according to claim 1,
Wherein the housing member is provided with a latching portion protruding a predetermined length inwardly along the circumferential direction on the inner surface thereof so that the light guide can be replaced to support the rim side of the optical lens. 3. The method of claim 2,
An illumination filter member for light generated by the LED is disposed inside the housing member,
Wherein the illumination filter member is replaceable with a light guide supported by the engagement portion and the end portion of the light guide when the accommodating member is coupled with the light guide. The method according to claim 1,
An illuminating filter member for light generated by the LED is disposed inside the light guide,
Wherein the light guide has an inner surface formed with an engaging portion protruding a predetermined length inward along the circumferential direction so as to support the edge of the illuminating filter member so that the optical lens and the illuminating filter member, The light guide can be replaced. The method according to claim 1,
Wherein the heat sink includes a first portion having at least one heat radiating fin and a second portion having a curved surface, the curved surface of the second portion being coupled to the holder so that the light guide can be replaced. The method according to claim 1,
Wherein the light guide can be replaced with a light guide whose one end is cut at a predetermined slope with respect to the longitudinal direction. The method according to claim 1,
Wherein the ratio of the diameter and the maximum length of the light guide satisfies the following range:
0.7? L / D? 1.19 (where L is the maximum length of the light guide and D is the diameter of the light guide) The method according to claim 1,
A downlight capable of replacing a light guide in which a hollow airtight member is disposed on a contact surface of the holder and the heat sink. The method according to claim 1,
Wherein the heat sink includes a receiving groove formed at a predetermined depth inwardly from one side so as to accommodate a length of the receiving member. The method according to claim 1,
Wherein the heat sink is provided with a hollow protrusion protruding outwardly from one surface thereof, and one end of the housing member is detachably coupled to the protrusion.

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