WO2010101405A2

WO2010101405A2 - Luminescent device

Info

Publication number: WO2010101405A2
Application number: PCT/KR2010/001320
Authority: WO
Inventors: Chul Sub Lee; Byung Hee Cho
Original assignee: Tyco Electronics Amp Korea Ltd.
Priority date: 2009-03-05
Filing date: 2010-03-03
Publication date: 2010-09-10
Also published as: WO2010101405A3; KR101496473B1; KR20100100169A; CN102369609A

Abstract

Disclosed is a luminescent device using LEDs which detachably fixes the LEDs to a target object, such as a streetlamp head, without soldering. The luminescent device includes a LED module on which circuit patterns electrically connected with LEDs mounted on the LED module are extended to an insertion hole formed through the LED module, and a joint connector including connection leads electrically connected with the circuit patterns to supply external power, and separably fixed to the insertion hole. Thereby, power is supplied to the LED module through the joint connector without soldering, and the LED module is fixed to a holding panel through assembly, thus facilitating replacement and repair of components.

Description

LUMINESCENT DEVICE

The present invention relates to a luminescent device using LEDs, and more particularly to a luminescent device in which LEDs are detachably fixed to a target object, such as a streetlamp head, without soldering.

Light emitting diodes (LEDs) are light sources having low power consumption and a long lifespan. Recently, as high brightness LEDs have been developed, the LEDs have gradually been used in a wide variety of fields.

FIG. 14 illustrates a module M using these LEDs which is mounted on a streetlamp head. Such a conventional module M uses a plurality LED lamps 100 so as to obtain sufficient brightness at night, and a lighting angle of some LED lamps 100 deviate from that of other LED lamps 100 so as to concentrate light emitted from the LED lamps 100. Further, a plurality of LEDs may be mounted in each LED lamp 100 so as to obtain a sufficient intensity of illumination.

FIG. 15 is partially cross-sectional view of a portion of the streetlamp head of FIG. 14. The unit LED lamp 100 including the LEDs is fixed onto a heat emission plate P1, and a circuit board P2 to turn on the LEDs is provided on the rear surface of the heat emission plate P1.

Here, the LED lamp 100 includes a body 110 formed in an approximately cylindrical shape and provided with a transparent window 111 on the upper surface thereof, and a circular plate 120 having a larger diameter than that of the body 110 and connected to the lower surface of the body 110. Electrode planes 121 to receive power supplied from the outside are formed symmetrically at the edge of the circular plate 120.

That is, the unit LED lamp 100 is treated as a unit in which the LEDs are turned on when power is supplied to the electrode planes 121 provided on the circular plate 120. Such a unit LED lamp 100 may be installed at any position of the light emission plate P1 or directly on the circuit board P2 as long as power can be supplied to both electrode planes 121. However, in order to protect the circuit board P2 from heat generated from the LEDs due to the turning-on of the LEDs, the heat emission plate P1 is generally interposed between the unit LED lamp 100 and the circuit board P2. Here, the heat emission plate P1 also serves as a supporter to firmly fix the unit LED lamp 100.

In the above conventional LED module M, in order to supply power to the LED lamp 100, holes are formed through the heat emission plate P1 at positions corresponding to the electrode planes 121 of the circular plate 120, electrodes (or electric wires) P21, each of which has one end mounted on the circuit board P2, are extended such that the other ends of the electrodes P21 are connected to lower parts of bolts B1 under bolt heads so as to contact the electrode planes 121, or are connected directly to the electrode planes 121 using soldering.

In this case, when the unit LED lamp 100 is replaced with a new one or the circuit board P2 is replaced with a new one, connection between the plural electrode planes 121 of the unit LED lamp 100 and the electrodes (or the electric wires) P21 are released, thereby causing inconvenience and thus requiring a long time and a great effort in maintenance and repair. Particularly, when the LED module M is used in a streetlamp, the streetlamp is located at a high position from the ground, and thus removal of solder parts and new soldering after replacement are inconvenient, and the hot solder parts may fall upon a worker's face and thus may cause work safety hazards.

Further, after the replacement has been carried out several times, the electrodes (or the electric wires) P21 are separated from the circuit board P2, thereby shortening product lifespan.

Therefore, the present invention has been made in view of the above problems, and it is an object of the present invention to provide a luminescent device which allows replacement of a LED lamp to repair the LED lamp to be smoothly carried out.

More concretely, the LED lamp is simply replaced with new one without soldering in installation of the new LED lamp and power connection.

It is a further object of the present invention to provide a luminescent device in which an LED lamp is firmly fixed to a target object, i.e., a holding panel, while supplying power to the LED lamp.

It is another object of the present invention to provide a luminescent device which allows a connector for replacement of an LED lamp to be easily separated.

It is another object of the present invention to provide a luminescent device which stably connects power to LEDs through a connector.

It is another object of the present invention to provide a luminescent device which includes a heat emission unit to increase heat emission effects.

It is another object of the present invention to provide a luminescent device which more firmly fixes an LED lamp through assembly with another sub-connector.

It is yet another object of the present invention to provide a luminescent device which stably fixes LED lamps, assembled from various components, to a holding panel.

In accordance with an aspect of the present invention, the above and other objects can be accomplished by the provision of a luminescent device including an LED module on which circuit patterns electrically connected with LEDs mounted on the LED module are extended to an insertion hole formed through the LED module, and a joint connector including connection leads electrically connected with the circuit patterns to supply external power, and separably fixed to the insertion hole.

The joint connector may further include a flange part caught by the insertion hole, and a body part formed under the flange part, and provided with elastic protrusion pieces formed at the side surface thereof, elastically protruded to the outside and fixedly inserted into the insertion hole.

Each connection lead may include an elastic connection piece elastically sagging below the lower surface of the flange part, and a vertical connection piece extended from the elastic connection piece and formed along the body part.

The luminescent device may further include a heat emission member contacting the rear surface of the LED module to emit heat generated from the LEDs.

The heat emission member may include a heat sink provided with a through hole provided with the inner circumferential surface, from which radially arranged ribs are protruded, and contacting the rear surface of the LED module, and a holding panel contacting the rear surface of the heat sink.

Through holes to which screws to fix the LED module are connected may be formed through the LED module.

The luminescent device may further include a socket connector including electric leads electrically connected with the connection leads, and coupled with the joint connector.

Latching protrusion pieces fixed to protrusions formed on the lower part of the joint connector may be formed at the inside of a connection hole of the socket connector, and radially arranged coupling flanges may be formed on the outer circumferential surface of the upper part of the socket connector and a protrusion part may be formed on the outer surface of the socket connector.

The luminescent device may further include a lens unit seated on the upper surface of the LED module, and a lens unit housing fixedly surrounding the outer circumferential surface of the lens unit and connected to the heat sink 31 so as to allow the lens unit to apply pressure to the LED module.

As described above, in the luminescent device in accordance with one embodiment of the present invention, power is supplied to the LED module through the joint connector without soldering and the LED module is fixed to the holding panel through assembly, thus facilitating replacement and repair of components.

Further, if the luminescent device further includes a separation lever, a worker can more easily remove the joint connector.

Further, the joint connector is closely attached to the circuit patterns of the LED module by restoring force of the elastic connection pieces, thus allowing power to be stably supplied to the LEDs.

If the luminescent device further includes the heat sink, the heat sink absorbs and emits heat generated from the LEDs, thus preventing damage to the LEDs due to heat accumulation.

If the luminescent device further includes the socket connector, the heavy heat sink is stably fixed to the holding panel. Moreover, by coupling the socket connector and the joint connector, power is supplied to the LEDs through the electric leads.

If the luminescent device further includes the lens unit and the lens unit housing, the LED module is more firmly fixed to the heat sink.

Further, if screws to fix the LED module are used, the LED module is more firmly fixed.

The above and other objects, features and other advantages of the present invention will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which:

FIG. 1 is an exploded perspective view of a luminescent device in accordance with a first embodiment of the present invention;

FIG. 2 is an exploded perspective view illustrating an LED module and a joint connector employed by the luminescent device of FIG. 1;

FIG. 3 is a cross-sectional view of the joint connector employed by the luminescent device of FIG. 1;

FIG. 4 is an exploded perspective view illustrating a heat sink and a socket connector employed by the luminescent device of FIG. 1;

FIG. 5 is a cross-sectional view of the socket connector employed by the luminescent device of FIG. 1;

FIG. 6 is a cross-sectional view of the luminescent device of FIG. 1 in an assembled state;

FIGs. 7 and 8 are top and bottom perspective views of a luminescent device in accordance with a second embodiment of the present invention, respectively;

FIGs. 9 and 10 are top and bottom perspective views of a luminescent device in accordance with a third embodiment of the present invention, respectively;

FIGs. 11 and 12 are top and bottom perspective views of a luminescent device in accordance with a fourth embodiment of the present invention, respectively;

FIG. 13 is a cross-sectional view of the luminescent device of FIGs. 11 and 12;

FIG. 14 is a view illustrating a conventional LED module; and

FIG. 15 is a partially cut-off perspective view of an LED lamp of FIG. 14.

Now, the functions, constructions, and effects of a luminescent device in accordance with preferred embodiments of the present invention will be described in detail with reference to the annexed drawings.

FIG. 1 is an exploded perspective view of a luminescent device in accordance with a first embodiment of the present invention.

A luminescent device 100 in accordance with the first preferred embodiment includes an LED module 1, a joint connector 2, a heat emission member 3, a socket connector 4, a lens unit 5, and a lens unit housing 6.

Hereinafter, a target object to which the luminescent device 100 is fixed is limited to a holding panel 32. Such a holding panel 32 has a plate shape, and if the luminescent device 100 is used in a streetlamp, the holding panel 32 may be a fixing member provided in the streetlamp. The holding panel 32 is made of metal and serves as a heat emission body to absorb heat generated from LEDs. Further, a plurality of luminescent devices may be installed on the holding panel 32.

The LED module 1 is a plate-shaped circuit board on which one LED 11 or a plurality of LEDs 11 is mounted and circuit patterns electrically connected to the LEDs 11 are formed. Here, the LED module 1 is made of non-conductive metal, and serves as a heat emission body to absorb heat generated from the LEDs 11. Further, an insertion hole 12 is vertically formed through the center of the LED module 1.

The joint connector 2 sequentially passes through the insertion hole 12 of the LED module 1, a through hole 311 of a heat sink 31 of the heat emission member 3, and an insertion hole 321 of the holding panel 32, and is connected to the socket connector 4 on the rear surface of the holding panel 32, thereby fixing the LED module 1 to the heat sink 31.

The lens unit 5 is installed such that the lower part of the lens unit 5 contacts the upper part of the LED module 1, thereby concentrating light emitted from the LEDs 11, and thus increasing the brightness of the LED module 1. Further, the lens unit housing 6 surrounds the outer circumferential surface of the lens unit 5 and is connected to the heat sink 31 so as to cause the lens unit 5 to apply pressure to the LED module 1. Here, a screw thread formed on the outer circumferential surface of the lower end of the lens unit housing 6 and a screw thread formed on the inner circumferential surface of the heat sink 31 may be connected by rotation.

In this case, the lens unit housing 6 and the lens unit 5 apply pressure to the LED module 1 toward the heat sink 31 to fix the LED module 1 to the heat sink 31, thus assisting the joint connector 2 in more firmly fixing the LED module 1 to the heat sink 31.

FIG. 2 is an exploded perspective view illustrating the LED module and the joint connector employed by the luminescent device of FIG. 1, and FIG. 3 is a cross-sectional view of the joint connector employed by the luminescent device of FIG. 1.

Circuit patterns 13 to supply power to the LEDs are formed around the insertion hole 12 of the LED module 1. If the plural LEDs are installed on the LED module 1, it is preferable that plural circuit patterns 13 are radially arranged in the same interval around the insertion hole 12.

The joint connector 2 includes connection leads 21 electrically connected to the circuit patterns 13, and is separably fixed to the insertion hole 12.

That is, the joint connector 2 has a function of supplying power to the LEDs through the connection leads 21, is inserted into the insertion hole 12 of the LED module and connected with the socket connector to have a function of fixing the LED module 1, and is separated from the LED module 1 by a worker if it is necessary to replace the LED module 1 with a new one.

The joint connector 2 includes a flange part 22 caught by the edge of the insertion hole 12, and a body part 23 formed under the flange part 22 and provided with elastic protrusion pieces 231 elastically protruded to the outside at the side surface of the joint connector 2.

Here, the flange part 22 having a greater diameter than that of the insertion hole 12 is formed above the cylindrical body part 23. Thus, when the joint connector 2 is inserted into the LED module 1, the flange part 22 supports the edge of the insertion hole 12.

The plural elastic protrusion pieces 231 are radially formed on the side surface of the body part 23. Lower parts of the elastic protrusion pieces 231 are connected to the body part 23 and both side surfaces and upper parts of the elastic protrusion pieces 231 are cut off so as to be separated from the body part 23, thereby being capable of being elastically pressed into the body part 23.

The elastic protrusion pieces 231 pass through the insertion hole 12 and are supported by the rear surface of the LED module 1, thereby allowing the LED module 1 to be fixed to the joint connector 2.

Insertion inclined planes 231a, contacting the insertion hole 12 to elastically move the elastic protrusion pieces 231 inwardly when the joint connector 2 is inserted into the insertion hole 12, are formed at the lower parts of the elastic protrusion pieces 231, and removal inclined planes 231b contacting the insertion hole 12 to elastically move again the elastic protrusion pieces 231 inwardly when the joint connector 2 is removed from the insertion hole 12, are formed at the upper parts of the elastic protrusion pieces 231.

That is, the insertion inclined planes 231a and the removal inclined planes 231b are respectively formed at the upper and lower parts of the elastic protrusion pieces 231 so as to elastically move the elastic protrusion pieces 231 inwardly when the joint connector 2 is inserted into and removed from the insertion hole 12.

An inclination of the removal inclined planes 231b is lower than an inclination of the insertion inclined planes 231a. Thus, elastic movement of the elastic protrusion pieces 231 is easily carried out when the joint connector 2 is inserted into the insertion hole 21, and greater force is required to elastically move the elastic protrusion pieces 231 when the joint connector 2 is removed from the insertion hole 21.

Therefore, a worker can easily insert the joint connector 2 into the insertion hole 21, but considerably high pulling force is required to remove the joint connector 2 from the insertion hole 21. Thereby, the joint connector 2 is not removed from the insertion hole 21 to the outside by external impact or vibration other than by force applied by the worker.

In order to allow the worker to easily remove the joint connector 2 from the insertion hole 21, the luminescent device further includes a separation lever 232. The separation lever 232 is a rod body which is connected to the upper end of the joint connector 2 or is formed integrally with the joint connector 2 by molding. The outer circumferential surface of the tip of the separation lever 232 is depressed so as to allow the worker to easily grip the tip by hand.

Each connection lead 21 includes an elastic connection piece 211 sagging below the lower surface of the flange part 22 and then elastically lifted, and a vertical connection piece 212 extended downwardly from the elastic connection piece 211 along the outer circumferential surface of the body part 23.

Here, the plural connection leads 21 are radially arranged corresponding to the circuit patterns 13 formed around the insertion hole 12, and the elastic connection pieces 211 of the connection leads 21 elastically move and contact the circuit patterns 13, when the joint connector 2 is inserted into the insertion hole 12.

In this case, since the elastic connection pieces 211 are connected to the circuit patterns 13 under the elastic connection pieces 211 apply pressure to the circuit patterns 13 at any time by means of restoring force of the elastic connection pieces 211, the connection of the elastic connection pieces 211 to the circuit patterns 13 is not released by external force, such as vibration transmitted from the outside, and thus power is stably supplied to the LEDs.

Portions of the flange part 22 located just above the elastic connection pieces 211 are cut and removed, thereby forming spaces to house the elastically moved elastic connection pieces 211. That is, when the flange part 22 is in area-contact with the edge of the insertion hole 21, the elastic connection pieces 211 are lifted to the spaces formed by partially cutting the flange part 22, and are electrically connected to the circuit patterns 13.

The vertical connection pieces 212 are fixed to the body part 23 through a stitching method, and lower end surfaces of the vertical connection pieces 212 are electrically connected to electric leads of the socket connector, which will be described later.

Further, protrusions 233 protruded from the inner wall surface of the hollowed joint connector 2 are formed at the lower part of the joint connector 2. The protrusions 233 are inserted into latching protrusion pieces 421 of the socket connector which will be described later, thereby coupling the socket connector and the joint connector 2 with each other.

FIG. 4 is an exploded perspective view illustrating the heat sink and the socket connector employed by the luminescent device of FIG. 1, and FIG. 5 is a cross-sectional view of the socket connector employed by the luminescent device of FIG. 1.

The heat emission member 3 serving as a unit to emit heat generated from the LEDs includes the heat sink 31 and the holding panel 32.

Here, the heat sink 31 is in area-contact with the holding panel 32, and the upper surface of the heat sink 31 contacts the rear surface of the LED module 1. Thus, the heat sink 31 absorbs heat generated from the LEDs to firstly emit the heat, and conducts the heat to the holding panel 32, and then the holding panel 32 secondarily emits the heat.

Further, the through hole 311 to pass the body part of the joint connector connected to the LED module is formed through the heat sink 31. Radially protruded ribs 312 are formed on the inner circumferential surface of the through hole 31. Each rib 312 has an inclined plane at one side thereof.

The socket connector 4 includes electric leads 41 electrically connected with the connection leads of the joint connector, and is connected to the joint connector 2.

Here, plural electric leads 41 are provided at the inside of the socket connector 4, i.e., within a connection hole 42 of the socket connector 4, so as to correspond to the connection leads of the joint connector, and are electrically connected with the vertical connection pieces of the respective connection leads.

Upper parts of the electric leads 41 are bent in a convex shape toward the inside of the connection hole 42 to have elasticity so as to be stably connected with the connection leads, and lower parts of the electric leads 41 are extended to the lower part of the socket connector 4 and are connected to separate IP housings H (in FIG. 12) connected with electric wires to supply power.

Further, the latching protrusion pieces 421, each of which is provided with a latching protrusion protruded from the upper end thereof, are formed on the bottom of the inside of the connection hole 42 of the socket connector 4, as shown in FIG. 5, so as to be latched onto the protrusions 233 (in FIG. 3) of the joint connector. The plural latching protrusion pieces 421 are installed such that they are separated from each other so as to pass through the lower parts of the protrusions 233 and thus elastically move to the center of the socket connector 4. Here, the lower surface of the latching protrusions of the latching protrusion pieces 421 or the protrusions of the joint connector may be gently inclined so as to assist elastic movement of the latching protrusion pieces 421 when the joint connector is removed from the insertion hole 21.

With reference to FIG. 4 again, outwardly protruded and radially arranged coupling flanges 43 are formed at the upper part of the socket connector 4, and are coupled with the ribs 312 formed on the inner circumferential surface of the through hole 311 of the heat sink 31. Further, a protrusion part 44 is formed on the outer surface of the socket connector 4, and contacts the rear surface of the holding panel 32. Here, a general sealing member 45 having elasticity is provided on the protrusion part 44, thereby causing the protrusion part 44 to contact the rear surface of the holding panel 32 in an airtight state.

Each coupling flange 43 is provided with an inclined plane at one side thereof corresponding to the inclined plane of each rib 312. Therefore, when the socket connector 4 is inserted into the through hole 311 of the heat sink 31 and then is rotated, the coupling flanges 43 move above the rib 312, and thus the socket connector 4 and the heat sink 31 are coupled.

Further, a projection 313 is formed on the upper surface of each rib 312, and a recess 431 corresponding to the projection 313 is formed on the lower surface of each coupling flange 43. Therefore, when the socket connector 4 inserted into the through hole 311 is rotated, the projections 313 of the ribs 312 are inserted into the recesses 431 of the coupling flanges 43. Thus, it may be possible to prevent the socket connector 4 from being separated from the through hole 31 due to undesired rotation of the socket connector 4.

By inserting the socket connector 4 into the insertion hole 321 of the holding panel 32 from the rear surface of the holding panel 32 and the through hole 311 of the heat sink 31 and then rotating the socket connector 4, the protrusion part 44 of the socket connector 4 and the coupling flanges 43 are respectively supported by the rear surface of the holding panel 32 and the ribs 312 of the heat sink 31, and thus the heat sink 31 is fixed to the holding panel 32.

Consequently, the construction of the luminescent device in accordance with the first preferred embodiment of the present invention to fix the LED module 1 to the holding panel 32 and the construction of the luminescent device to supply power to the LEDs will be described, as follows.

As shown in FIG. 6, the heat sink 31 is fixed to the holding panel 32 by the protrusion part 44 and the coupling flanges 43 of the socket connector 4, and the LED module 1 is fixed to the heat sink 31 by connection of the protrusions 233 of the joint connector 2 and the latching protrusion pieces 421 of the socket connector 4. Further, the LED module 1 is additionally fixed to the joint connector 2 by the flange part 22 and the elastic protrusion pieces 421 of the joint connector 2. Therefore, the LED module 1 is pressed onto the heat sink 31 by the lens unit housing 6 and the lens unit 5, thereby being more firmly fixed to the heat sink 31.

Thereby, the LED module may be fixed to the holding panel only through assembly without any additional fixing unit, such as a screw. Further, when the LED module needs to be repaired, the respective components are separated in reverse to the assembly procedure, and necessary components are replaced with new ones, thereby reducing worker's effort.

Supply of power to the LEDs 11 is achieved through the connection leads 21 of the joint connector 2 electrically connected with the circuit patterns 13 of the LED module 1, and the electric leads 41 of the socket connector 4, each of which is provided with one end electrically connected with each connection lead 21 and the other end electrically connected directly with the known electric wire to supply external power or with the electric wire by the IP housing connected with the electric wire. The respective electric connections are stably achieved through elasticity of the respective leads without separate soldering. Therefore, it may be possible to solve conventional problems due to soldering to supply power.

FIGs. 7 and 8 are top and bottom perspective views of a luminescent device in accordance with a second embodiment of the present invention, respectively.

The luminescent device in accordance with the second embodiment of the present invention includes an LED module 1, a joint connector 2, a heat sink 31, and a socket connector 4. A part of the construction and operation of the second embodiment are substantially the same as those of the first embodiment except for the description below, and a detailed description thereof will thus be omitted because it is considered to be unnecessary.

In the luminescent device in accordance with the second embodiment of the present invention, the heat sink 31 is fixed to a holding panel 32 by the socket connector 4, and the LED module 1 is fixed to the heat sink 31 through assembly of the socket connector 4 and the joint connector 2.

Here, in order to more firmly fix the LED module 1 and closely attach the LED module 1 and the heat sink 31 to each other, through holes 14 to which screws S to fix the LED module 1 are connected are formed through the LED module 1.

That is, the screws S serve to closely attach the LED module 1 to the heat sink 31, thereby allowing heat generated from the LEDs to be effectively emitted through the heat sink 31.

FIGs. 9 and 10 are top and bottom perspective views of a luminescent device in accordance with a third embodiment of the present invention, respectively.

The luminescent device in accordance with the third embodiment of the present invention includes an LED module 1, a joint connector 2, and a socket connector 4. A part of the construction and operation of the third embodiment are substantially the same as those of the first embodiment except for the description below, and a detailed description thereof will thus be omitted because it is considered to be unnecessary.

Here, a protrusion part of the socket connector 4 is supported by a holding panel 32 through contact with the rear surface of the holding panel 32 around an insertion hole of the holding panel 32, and the LED module 1 is fixed to the holding panel 32 by the joint connector 2 coupled with the socket connector 4.

Further, the LED module 1 is more firmly fixed to the holding panel 32 and closely attached to the holding panel 32 by screws S, thereby obtaining high heat emission effects.

The third embodiment may be applied to a luminescent device in which an LED module using LEDs, which do not emit a large amount of heat, is simply installed on a holding panel without a heat sink.

FIGs. 11 and 12 are top and bottom perspective views of a luminescent device in accordance with a fourth embodiment of the present invention, respectively, and FIG. 13 is a cross-sectional view of the luminescent device of FIGs. 11 and 12.

The luminescent device in accordance with the fourth embodiment of the present invention includes an LED module 1, a joint connector 2, and a heat sink 31. A part of the construction and operation of the fourth embodiment are substantially the same as those of the first embodiment except for the description below, and a detailed description thereof will thus be omitted because it is considered to be unnecessary.

Here, vertical connection pieces 212 of connection leads 21 of the joint connector 2 are extended downwardly so as to be protruded from the rear surface of the holding panel 32. Further, an IP housing H is connected to the vertical connection piece 212 of each connection lead 21 protruded from the rear surface of the holding panel 32.

Further, the vertical connection pieces 212 are formed so as to be spread out in the outward direction of an insertion hole 321 of the holding panel 32, and upper surfaces of the IP housings H inserted into the vertical connection pieces 212 support the holding panel 32 so as to fix the LED module 1 and the heat sink 31 to the holding panel 32.

The LED module 1 is more firmly fixed to the heat sink 31 by screws S, thereby obtaining high heat emission effects. Further, it is preferable that the screws S pass through the holding panel 32 so as to firmly fix the heat sink 31 to the holding panel 32.

Various embodiments have been described in the best mode for carrying out the invention.

As apparent from the above description, in the luminescent device in accordance with one embodiment of the present invention, power is supplied to the LED module through the joint connector without soldering and the LED module is fixed to the holding panel through assembly, thus facilitating replacement and repair of components.

Although the preferred embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims.

Claims

A luminescent device comprising:

an LED module on which circuit patterns electrically connected with LEDs mounted on the LED module are extended to an insertion hole formed through the LED module; and

a joint connector including connection leads electrically connected with the circuit patterns to supply external power, and separably fixed to the insertion hole.
The luminescent device according to claim 1, wherein the joint connector further includes:

a flange part caught by the insertion hole; and

a body part formed under the flange part, and provided with elastic protrusion pieces formed at the side surface thereof, elastically protruded to the outside and fixedly inserted into the insertion hole.
The luminescent device according to claim 2, wherein each connection lead includes:

an elastic connection piece elastically sagging below the lower surface of the flange part; and

a vertical connection piece extended from the elastic connection piece and formed along the body part.
The luminescent device according to any one of claims 1 to 3, further comprising a heat emission member contacting the rear surface of the LED module to emit heat generated from the LEDs.
The luminescent device according to claim 4, wherein the heat emission member includes:

a heat sink provided with a through hole provided with the inner circumferential surface, from which radially arranged ribs are protruded, and contacting the rear surface of the LED module; and

a holding panel contacting the rear surface of the heat sink.
The luminescent device according to claim 5, wherein through holes to which screws to fix the LED module are connected are formed through the LED module.
The luminescent device according to claim 5, further comprising a socket connector including electric leads electrically connected with the connection leads, and coupled with the joint connector.
The luminescent device according to claim 7, wherein latching protrusion pieces fixed to protrusions formed on the lower part of the joint connector are formed at the inside of a connection hole of the socket connector, and radially arranged coupling flanges are formed on the outer circumferential surface of the upper part of the socket connector and a protrusion part is formed on the outer surface of the socket connector.
The luminescent device according to claim 7, further comprising:

a lens unit seated on the upper surface of the LED module; and

a lens unit housing fixedly surrounding the outer circumferential surface of the lens unit and connected to the heat sink so as to allow the lens unit to apply pressure to the LED module.
The luminescent device according to claim 4, wherein the heat emission member includes a holding panel contacting the rear surface of the heat sink.
The luminescent device according to claim 10, further comprising a socket connector including electric leads electrically connected with the connection leads, and coupled with the joint connector.
The luminescent device according to claim 11, wherein through holes to which screws to fix the LED module are connected are formed through the LED module.