TWI438367B - Led lamp - Google Patents

Description

LED light fixture

The invention relates to an LED lamp, in particular to an LED lamp having a heat dissipation structure.

Compared with traditional light sources, light-emitting diodes (LEDs) have higher luminous efficiency (light source temperature is lower than general bulbs), low radiation, low power consumption, long life, low voltage, fast start-up, environmental protection, anti-seismic compression, The luminaire can be miniaturized, and the illuminating device using LED as a light source is currently widely used in various lighting devices, such as indoor lighting, outdoor lighting, portable lighting (such as flashlight), and situational lighting. However, since the LED itself is a point light source and the illuminating characteristic has a strong directionality, the illuminating angle is much smaller than that of a conventional light source (such as an incandescent lamp, an energy saving lamp, etc.).

Referring to FIG. 1 , in order to improve the problem of insufficient light divergence angle of an ordinary LED light bulb, a plurality of sets of LED light source substrates can be joined into a ring-shaped light-emitting module, which can greatly improve the light divergence angle of the LED lighting device, but The bonding between the multiple light source substrates makes the electrical connection complicated, and the heat energy (indicated by the arrow) generated by the LED cannot be effectively discharged naturally, and the heat dissipation effect is not good.

In view of this, the present invention provides an LED lamp having a wide light divergence angle and good heat dissipation.

An LED lamp includes a lamp holder, a heat dissipating body mounted on the lamp holder, a light source substrate attached to the end of the heat dissipating body, and a connector electrically connected to the light source substrate and the lamp holder, the heat dissipating body having opposite to each other along the axial direction a first end portion and a second end portion, the diameter of the first end portion is larger than the diameter of the second end portion; the surface of the heat dissipating body is spaced apart from the heat dissipating fin, and the radial dimension of the heat dissipating fin is from the second end portion One end portion gradually increases; the first light source substrate is locked to the first end portion, and the second light source substrate is locked to the second end portion, and the first light source substrate and the second light source substrate are on a plane perpendicular to the axial direction of the heat sink body The projections do not coincide.

The first light source substrate and the second light source substrate are disposed parallel to each other and are not coincident with each other in a direction parallel to the light source substrate. In use, the first light source substrate is disposed at the near ground end, and the cold air flows downward due to the upward flow of the hot air. The heat generated by the LED light source on the first light source substrate does not accumulate to generate secondary heating on the second light source substrate, and the heat dissipation performance is good. The second light source substrate may provide an illumination direction different from the first light source substrate, thereby expanding the light emission angle of the LED light fixture.

111, 121‧‧‧ first light source substrate

112, 122‧‧‧ second light source substrate

21, 22‧‧‧LED bulbs

31, 32‧‧‧ heat sink

311, 321‧‧‧ first end

312, 322‧‧‧ second end

313, 323‧‧ ‧ heat sink fins

411, 421‧‧‧ first heat conducting plate

412, 422‧‧‧second heat conducting plate

51, 52‧‧‧ connectors

61, 62‧‧‧ lamp holder

711, 721‧‧‧ first lampshade

712, 722‧‧‧ second lampshade

7121, 7211‧‧‧ cover

7122, 7212‧‧‧ Connections

81, 82‧‧‧Insulation parts

911, 921‧‧‧ first lighting direction

912, 922‧‧‧second lighting direction

FIG. 1 is a schematic diagram of a heat dissipation mode of a ring-shaped LED lighting module.

Fig. 2 is a view showing a state of use of the LED lighting device of the first embodiment of the present invention.

3 is an exploded view showing the structure of an LED lighting fixture according to a first embodiment of the present invention.

4 is a light distribution graph of an LED lighting fixture according to a first embodiment of the present invention.

Fig. 5 is a view showing a state of use of the LED lighting device of the second embodiment of the present invention.

Fig. 6 is an exploded view showing the structure of an LED lighting fixture according to a second embodiment of the present invention.

Fig. 7 is a light distribution graph of an LED lighting fixture according to a second embodiment of the present invention.

Referring to FIG. 2 and FIG. 3 together, the LED lamp of the first embodiment of the present invention is disclosed. The LED lamp includes a lamp holder 61, a connector 51, a heat sink 31, a first light source substrate 111, and a second light source substrate. 112.

The heat radiating body 31 is axially mounted on the socket 61. The heat radiating body 31 has a first end portion 311 and a second end portion 312 which are opposite to each other in the axial direction. The first end portion 311 has a first diameter, and the second end portion 312 There is a second diameter that is greater than the second diameter. The heat dissipating body 31 has a cage shape, and is provided with a heat dissipating fin 313 at a surface thereof. The radial dimension of the heat dissipating fin 313 is gradually increased from one end of the second end portion 312 toward one end of the first end portion 311.

The first light source substrate 111 is locked to the first end portion 311 of the heat sink 31 , and a first heat conducting plate 411 is disposed between the first light source substrate 111 and the heat sink 31 . The first lamp cover 711 is mounted on the first light source substrate 111, and the first lamp cover 711 and the first light source substrate 111 form a casing. A plurality of LED bulbs (not shown) having different illumination directions are located in the housing and mounted on the first light source substrate 111. The first lamp cover 711 may be a transparent lamp cover, or may be a reflector cover with a reflective element or the like.

The second light source substrate 112 is locked to the second end portion 312 of the heat sink 31 , and a second heat conducting plate 412 is disposed between the second light source substrate 112 and the heat sink 31 .

The first light source substrate 111 and the second light source substrate 112 are both annular structures, and the outer diameter of the outer ring of the second light source substrate 112 is smaller than the inner diameter of the inner ring of the first light source substrate 111, and the first light source substrate 111 and the second The light source substrates 112 are disposed in parallel to each other and do not coincide with each other in a direction parallel to the light source substrate.

The second lamp cover 712 is mounted on the second light source substrate 112, and the second lamp cover 712 has a cover. The body 7121 and a connecting portion 7122. The cover body 7121 and the second light source substrate 112 form a casing, and a plurality of LED bulbs 21 having different illumination directions are located in the casing and mounted on the second light source substrate 112. An insulating member 81 is sleeved on the connecting portion 7122 and connected to the socket 61 to connect the second lamp cover 712, the second light source substrate 112, the heat sink 31, and the first light source substrate 111 to each other. The second lamp cover 712 may be a transparent lamp cover, or may be a reflector cover with a reflective element or the like.

The connector 51 is mounted on the second end portion 312 of the heat sink 31 through the second light source substrate 112 and the second lamp cover 712, and is electrically connected to the first light source substrate 111, the second light source substrate 112, and the socket 61. .

Referring to FIG. 2, the LED lamp of the first embodiment of the present invention can be mounted on the ceiling when in use. In the preferred use, the first end portion 311 of the heat sink 31 is placed near the ground end, and the cold air flows upward due to the hot air. The characteristic of the downward flow is that the heat generated by the LED bulb 21 on the first light source substrate 111 does not accumulate and the secondary heating is generated on the second light source substrate 112, and the heat dissipation performance is good. 4, in the light distribution graph of the LED lamp of the first embodiment of the present invention, the first light source substrate 111 provides a first illumination direction 911, and the second light source substrate 112 provides a second illumination direction different from the first light source substrate 111. 912, expanding the light emission angle of the LED lighting fixture.

In the present solution, the two light source substrates are arranged parallel to each other and are not overlapped with each other in a direction parallel to the light source substrate, and a cage-shaped heat sink is added between the light source substrates to increase the distance between the light source substrates, thereby contributing to heat dissipation. Improvement. The use of the fin-shaped fins can improve the circulation of air and increase the effective heat-dissipating area. The two terminals of the cage-shaped heat sink have different diameters to avoid repeated heating of the light source substrate.

Referring to FIG. 5 and FIG. 6 together, the LED lamp of the second embodiment of the present invention is disclosed. The LED lamp of the embodiment is similar in structure to the LED lamp of the first embodiment, and includes a second lamp cover 722 and a second light source. The substrate 122, the LED bulb 22, the second heat conducting plate 422, the heat sink 32 having the heat radiating fins 323, the first heat conducting plate 421, the first light source substrate 121, the first lamp cover 721, the connector 52, and the socket 62. The first light source substrate 121 is a circular ring structure, and the second light source substrate 122 has a disk diameter smaller than the first light source substrate 121 ring. Inner ring diameter. The lamp holder 62 is mounted on the first end portion 321 of the heat sink 32 having a larger diameter, and the connector 52 is mounted on the first end portion 321 of the heat sink 32 through the first light source substrate 121 and the first lamp cover 721, and The first light source substrate 121, the second light source substrate 122, and the socket 62 are electrically connected. The first lamp cover 721 and the insulating member 82 having the cover body 7211 and the connecting portion 7212 are also mounted on the first end portion 321 of the heat radiating body 32 having a larger diameter, and the second lamp cover 722 is mounted on the heat radiating body 32 having a smaller diameter. Second end 322.

Referring to FIG. 5, the LED lamp of the second embodiment of the present invention can be mounted on the lamp holder in use. In the preferred use, the first end portion 321 of the heat sink 32 is placed at the near-ground end, and the hot air flows upward due to the upward flow. The characteristic that the air flows downward, the heat generated by the LED bulb 22 on the first light source substrate 121 does not accumulate, and the second light source substrate 122 is reheated twice, and the heat dissipation performance is good. Referring to FIG. 7 , in the light distribution graph of the LED lamp of the second embodiment of the present invention, the first light source substrate 121 provides a first illumination direction 921 , and the second light source substrate 122 provides a second illumination direction different from the first light source substrate 121 . 922, expanding the light emission angle of the LED lighting fixture.

One of ordinary skill in the art will recognize that the above embodiments are only used The present invention is not limited by the scope of the invention, and it is intended to be within the scope of the invention.

31‧‧‧ Heat sink

61‧‧‧ lamp holder

711‧‧‧First lampshade

712‧‧‧second lampshade

Claims (10)

An LED lamp comprises a lamp holder, a heat sink mounted on the lamp holder, a light source substrate locked to the end of the heat sink body, and a connector electrically connected to the light source substrate and the lamp holder, wherein the heat sink has along the heat sink body a first end portion and a second end portion axially opposite to each other, the diameter of the first end portion being larger than the diameter of the second end portion; the surface of the heat dissipating body is provided with heat dissipating fins, and the radial dimension of the heat dissipating fin is from The two end portions gradually increase toward the first end portion; the first light source substrate is locked to the first end portion, the second light source substrate is locked to the second end portion, and the first light source substrate and the second light source substrate are perpendicular to the heat sink body The projections on the axial plane do not coincide. The LED lamp of claim 1, wherein the first light source substrate and the second light source substrate are disposed in parallel with each other. The LED lamp of claim 1, wherein the first light source substrate has a larger diameter than the second light source substrate. The LED lamp of claim 3, wherein the first light source substrate and the second light source substrate are annular structures, and the outer diameter of the second light source substrate is smaller than the inner ring diameter of the first light source substrate. The LED lamp of claim 4, wherein the connector is mounted on the second end of the heat sink through the second light source substrate, and is coupled to the first light source substrate, the second light source substrate, and the lamp holder. Electrical connection. The LED lamp of claim 3, wherein the first light source substrate is a ring structure, the second light source substrate is a disk structure, and the second light source substrate has a diameter smaller than an inner ring diameter of the first light source substrate. . The LED lamp of claim 6, wherein the connector is mounted on the first end of the heat sink through the first light source substrate, and is coupled to the first light source substrate, the second light source substrate, and the lamp holder. Electrical connection. The LED lamp of claim 1, wherein the first light source substrate and the second light source substrate are mounted with a lamp cover. The LED lamp of claim 8, wherein the lampshade is a transparent lampshade. The LED lamp of claim 1, wherein a heat conducting plate is disposed between the first light source substrate and the second light source substrate and the heat sink.