TWI409406B - Led lamp - Google Patents

Abstract

An LED lamp includes a base, a lampshade, a substrate and a light distribution board. A number of light emitting diodes are mounted on the substrate. The lampshade, the substrate and the light distribution board are all fixed to the base. Two sides of the light distribution board respectively face the lampshade and the substrate. The light distribution board is formed with a number of protrusions. The protrusions are configured for totally reflecting the incident light beams with incident angle within a preset range from the light emitting diodes.

Description

Light-emitting diode lamp

The invention relates to a lighting device, in particular to a light-emitting diode lamp suitable for indoor lighting.

Compared with traditional light sources, light-emitting diodes have the advantages of small size, long life, low driving voltage, fast start-up, environmental protection, shock resistance and compression resistance, and are now widely used in daily indoor lighting. However, due to the small light-emitting point and beam angle of the light-emitting diode, the light intensity of the light-emitting diode is generally concentrated, which easily causes glare to the observer, causing adverse reactions such as visual fatigue and headache of the observer.

In view of the above, the present invention provides a light-emitting diode lamp with high uniformity of light emission and reduced glare.

A light-emitting diode lamp includes a base and a lamp cover and a light source substrate fixed on the base, the light-emitting substrate is mounted with a light-emitting diode, and further comprises a light distribution plate fixed on the base, wherein the light distribution plate The two sides are respectively opposite to the lamp cover and the light source substrate, and the light distribution plate is formed with a plurality of protrusions for totally reflecting the light from the light-emitting diode incident on the light distribution plate at a predetermined incident angle.

The above-mentioned light-emitting diode lamp changes the light emission direction through the light distribution plate to make the light More uniform, thus reducing glare.

100‧‧‧Lighting diode lamps

10‧‧‧ Pedestal

20‧‧‧shade

30‧‧‧Power connector

40‧‧‧Light source substrate

50‧‧‧Lighting board

42‧‧‧Lighting diode

12‧‧‧ Heat sink fins

14‧‧‧ card slot

22‧‧‧Snaps

16‧‧‧First containment chamber

18‧‧‧Second containment chamber

44‧‧‧reflective layer

52‧‧‧ bumps

54‧‧‧ Peak

24‧‧‧ lens array

1 is a schematic view of a light-emitting diode lamp according to an embodiment of the present invention.

2 is a schematic cross-sectional view of the light emitting diode lamp of FIG. 1.

FIG. 3 is a schematic diagram of the optical path of the light emitted by the light-emitting diode lamp of FIG.

4 is a schematic view showing the optical path of the obliquely emitted light of the light-emitting diode lamp of FIG. 2.

FIG. 5 is a schematic cross-sectional view of a light-emitting diode lamp according to another embodiment of the present invention.

Referring to FIG. 1 and FIG. 2 simultaneously, the LED device 100 has a substantially elongated tubular structure, and includes a base 10, a lamp cover 20, a power connector 30, a light source substrate 40, and a light distribution plate 50. The globe 20, the light source substrate 40, and the light distribution plate 50 are both fixed to the susceptor 10. The power connector 30 is disposed at both ends of the light emitting diode lamp 100, and the power connector 30 is electrically connected to a power source (not shown). The light source substrate 40 is electrically connected to the power connector 30, and a light-emitting diode 42 is mounted thereon. The light distribution plate 50 is for changing the direction of light emitted from the light-emitting diode 42.

The susceptor 10 is made of an aluminum alloy substrate with good heat dissipation, and can dissipate the heat generated when the illuminating diode lamp 100 operates. The bottom of the base 10 is provided with a plurality of heat dissipation fins 12 spaced apart from each other, and the heat dissipation fins 12 are used to increase the surface area of the base 10 to accelerate air circulation and heat dissipation efficiency. The edge of the base 10 is formed with a card slot 14 . The edge of the lamp cover 20 extends toward the latching portion 22 , and the latching portion 22 is engaged in the slot 14 to fix the lamp cover 20 to the base 10 . The base 10 is also formed with The second receiving cavity 18 of the lamp cover 20 is adjacent to the first receiving cavity 16 away from the lamp cover 20.

The light source substrate 40 is received in the first receiving cavity 16 , and the light source substrate 40 and the susceptor 10 are bonded together by a high thermal conductivity thermal conductive tape, and the thermal conductive tape can better transfer the heat generated by the light source substrate 40 to the pedestal 10 . Then, heat exchange is performed with the air through the fins 12. The light source substrate 40 is coated with a reflective layer 44 on the surface where the light emitting diode 42 is located.

The light distribution plate 50 is housed in the second receiving cavity 18, and both sides of the light distribution plate 50 are disposed opposite to the light source substrate 40 and the lamp cover 20, respectively. The surface of the light distribution plate 50 opposite to the lamp cover 20 forms a plurality of protrusions 52 which are connected end to end to form a zigzag shape. Each of the protrusions 52 has an isosceles triangle in cross section, and the angle of the peaks 54 is set such that the protrusions 52 can totally illuminate the light from the light-emitting diode 42 near the forward emission.

Referring to FIG. 3, the light emitted from the light-emitting diode 42 in the forward or near-forward direction is projected onto the protrusion 52 at the center position and is totally reflected by the protrusion 52. The light is totally reflected and projected onto the reflective layer 44. The reflective layer 44 reflects the light again to the peripheral projection 52, the angle of incidence of which decreases relative to the first time. Here, the "peripheral projection 52" refers to a projection 52 located on both sides of the central position. After the light is totally reflected by one or more times, the incident angle will be less than a critical angle, and can be emitted after being refracted to the lamp cover 20 by the protrusion 52 at the periphery. In this way, the light emitted by the light-emitting diode 42 in the forward or near-forward direction is reflected and refracted by the light distribution plate 50, and can be partially emitted from the protrusion 52 at the periphery, so that the central light is reduced and the astigmatism effect is generated, so that the illumination is more uniform. The lighting effect is softer, reducing glare.

Referring to FIG. 4, the obliquely emitted light of the LED 42 is reflected by the protrusion 52, and the scattering angle of the light converges, so that the distribution density of the peripheral light is closer to the central distribution density, so that the illumination is more uniform.

Referring to FIG. 5, in another embodiment, the outer surface of the lamp cover 20 is formed with a curved lens array 24, which has a diverging effect on the light emitted to the lamp cover 20, thereby increasing the light output of the light-emitting diode 42. The angle makes the lighting effect softer. An arcuate lens array 24 may also be formed on the inner surface of the globe 20.

10‧‧‧ Pedestal

20‧‧‧shade

40‧‧‧Light source substrate

50‧‧‧Lighting board

42‧‧‧Lighting diode

12‧‧‧ Heat sink fins

14‧‧‧ card slot

22‧‧‧Snaps

16‧‧‧First containment chamber

18‧‧‧Second containment chamber

44‧‧‧reflective layer

52‧‧‧ bumps

54‧‧‧ Peak

Claims (8)

A light-emitting diode lamp includes a base and a lamp cover and a light source substrate fixed on the base, wherein the light source substrate is mounted with a light-emitting diode, and the improvement thereof comprises: a light distribution plate fixed on the base, The two sides of the light distribution plate are respectively opposite to the lamp cover and the light source substrate. The surface of the light source substrate is coated with a reflective layer on the surface of the light emitting diode, and the light distribution plate is formed with a plurality of protrusions, and the light emitting diode is convex. The light from the light-emitting diode incident on the light distribution plate at a predetermined incident angle is totally reflected, so that the totally reflected light is projected onto the reflective layer; the reflective layer is used to reflect the light incident on the reflective layer To the periphery of the bulge, the light is refracted by the protrusion at the periphery to the lampshade and then ejected. The illuminating diode lamp of claim 1, wherein the outer surface of the lampshade is formed with an arcuate lens array that diverges light incident on the lampshade. The illuminating diode lamp of claim 1, wherein the inner surface of the lampshade is formed with an arcuate lens array that diverges light incident on the lampshade. The illuminating diode lamp of claim 1, wherein the plurality of protrusions are connected to form a zigzag. The light-emitting diode lamp of claim 1, wherein the base is formed with a card slot, and the lamp cover is formed with a buckle portion facing the opposite side, the buckle portion is locked in the card slot, and the lamp cover is fixed at the lamp cover. On the pedestal. The illuminating diode lamp of claim 1, wherein the The pedestal also includes a plurality of spaced fins. The light-emitting diode lamp of claim 1, wherein the base is formed with a second receiving cavity adjacent to the lamp cover and a first receiving cavity away from the lamp cover, and the light source substrate is locked in the first receiving cavity. The light distribution plate is disposed in the second receiving cavity. The illuminating diode lamp according to claim 1, wherein the light source substrate and the susceptor are bonded together by a thermally conductive tape having high thermal conductivity.