TW201400757A - Light emitting device - Google Patents

Abstract

A light emitting device comprises an optical lens and a light-emitting diode (LED). The optical lens has a recess, a lower surface, an outer light-emitting surface and a heat dissipating channel. The recess is extended forward the outer light-emitting surface from the lower surface to form an inner light-entering surface, and the heat dissipating channel is extended to the inner light-entering surface from the outer light-emitting surface. The LED is disposed corresponding to the recess.

Description

Illuminating device

The present invention relates to a light-emitting device, and more particularly to a light-emitting device having a heat-dissipating passage.

A conventional light-emitting device includes a light-emitting diode. In order to make the light output of the light-emitting device conform to a desired light color, a layer of fluorescent glue is usually coated around the light-emitting diode.

However, the fluorescent glue will hinder the heat dissipation of the light-emitting diode, and when the heat dissipation design of the light-emitting diode is poor, the temperature of the light-emitting diode will be too high to affect the light color.

The invention relates to a light-emitting device which has a good heat-dissipating effect and can reduce the temperature of the light-emitting device.

According to an embodiment of the invention, a lighting device is proposed. The light emitting device includes an optical lens and a light emitting diode. The optical lens has a concave portion, a lower surface, an outgoing light surface and a heat dissipation channel. The concave portion extends from the lower surface to the outer light-emitting surface to form an inner light-incident surface, and the heat dissipation passage extends from the outer light-emitting surface to the inner light-incident surface. The light-emitting diode is disposed corresponding to the concave portion.

In order to provide a better understanding of the above and other aspects of the present invention, the following detailed description of the embodiments and the accompanying drawings

Referring to FIG. 1A, an external view of a light emitting device according to an embodiment of the present invention is shown. The light-emitting device 100 can be applied to various light-receiving devices such as a light box, a street light, and a desk lamp.

The light emitting device 100 includes at least one optical lens 110, at least one light emitting diode 120, and a circuit board 130.

The optical lens 110 is disposed on the circuit board 130 in pairs with the light emitting diode 120. In another example, the plurality of light emitting diodes 120 may be disposed corresponding to the same optical lens 110. In other embodiments, the number of the light emitting diodes 120 and the optical lenses 110 of the light emitting device 100 may each be a single.

The optical lens 110 has a concave portion 110r, a lower surface 110b, an outgoing light surface 110s1, and a heat dissipation channel 111. The concave portion 110r extends from the lower surface 110b toward the outgoing light surface 110s1 to form an inner light incident surface 110s2, and the heat dissipation passage 111 is formed from the light exit surface. 110s1 extends to the inner entrance surface 110s2. Due to the design of the heat dissipation channel 111, the heat generated by the light-emitting diode 120 can be quickly radiated to the outside through the heat dissipation channel 111. According to the simulation results, the temperature drop directly above (higher or highest temperature) of the light-emitting diode 120 in this example can be about 2.5 to 8% compared to the design of omitting the heat dissipation channel 111.

The material of the optical lens 110 is, for example, glass, polycarbonate (PC), polymethylmethacrylate (PMMA) or silicone.

The light emitting diode 120 is disposed at a position corresponding to the concave portion 110r. For example, the light emitting diode 120 is disposed directly under the concave portion 110r. In another embodiment, at least a portion of the light emitting diode 120 is disposed in the recess 110r to reduce the overall thickness of the light emitting device 100.

Referring to Fig. 1B, a cross-sectional view taken along line 1B-1B' in Fig. 1A is shown. The light L emitted from the light-emitting diode 120 is incident on the inner light incident surface 110s2, enters the optical lens 110, and is then emitted from the outgoing light surface 110s1.

The outgoing light surface 110s1 is a curved surface, for example, a curved surface that is convex and has a concave portion in the intermediate portion, and diffuses the light L emitted from the outgoing light surface 110s1. In another embodiment, the outgoing light surface 110s1 may be formed by a plane, a curved surface, or a combination thereof. The outgoing light surface 110s1 of different geometric contours can cause the light to condense, expand, and change the light exiting angle and/or range of the light.

The inner light entrance surface 110s2 is, for example, a curved surface, such as a concave curved surface, but it may also be a surface composed of a plane, a curved surface, or a combination thereof.

The light emitting device 100 further includes at least one positioning post 112 disposed on the lower surface 110b of the optical lens 110. One end of the optical lens 110 is positioned through the positioning post 112 to the positioning hole 131 on the circuit board 130. In addition, the optical lens 110 and the positioning post 112 may be integrally formed, or may be separately fabricated and bonded together by, for example, bonding or snapping.

The optical lens 110 has a geometrically symmetric center C1 whose geometric profile is symmetrical with respect to this geometrically symmetric center C1. The heat dissipating channel 111 passes through the geometric symmetry center C1 of the optical lens 110. However, the heat dissipating channel 111 may extend from any portion of the egress light surface 110s1 to the inner light incident surface 110s2 of the recess 110r. In addition, the optical lens 110 can be disposed on the circuit board 130 in such a manner that the geometric center of symmetry C1 is almost overlapped with the optical axis S1 of the light-emitting diode 120. However, the geometric center symmetry C1 can also be separated from the left and right sides of the optical axis S1 by a distance.

As shown in the enlarged view of FIG. 1B, the heat dissipation channel 111 is inside the light incident surface. 110s2 exposes the opening 111a1, the light-emitting diode 120 has a light-emitting surface 120u, and the light-emitting surface 120u and the optical axis S1 of the light-emitting diode 120 intersect at an intersection RP, and the intersection RP and the edge 111a3 of the lower opening 111a1 are connected to the optical axis. The angle A1 between S1 is preferably less than 5 degrees, but may be greater than 5 degrees. In detail, if the angle A1 is too small, the heat dissipation effect is lowered; if the angle A1 is too large, although the heat dissipation effect is improved, the heat dissipation channel 111 may cause the generation of the optical dark band. When the angle A1 is about 5 degrees, both the heat dissipation effect and the optical quality can be considered. However, the value of the angle A1 may be determined according to actual needs, and is not limited by the embodiment of the present invention.

Please refer to FIG. 2, which is a cross-sectional view of an optical lens according to another embodiment of the present invention. The junction 110s3 of the heat dissipation passage 111 and the inner entrance surface 110s2 is smooth, that is, the inner wall surface 111s of the heat dissipation passage 111 is smoothly connected with the inner light entrance surface 110s2, and the joint 110s3 is geometrically tangent or nearly tangent.

In the above embodiment, the heat dissipation channel 111 is a cylindrical hole, which is not intended to limit the embodiments of the present invention, and is exemplified below.

Please refer to FIG. 3, which is a cross-sectional view of a heat dissipation channel according to another embodiment of the present invention. In this example, the heat dissipation channel 111 is a tapered column hole. The heat dissipation channel 111 exposes an upper opening 111a2 on the outgoing light surface 110s1, and exposes the opening 111a1 on the inner light incident surface 110s2. The area of the upper opening 111a2 is larger than the area of the lower opening 111a1. The cross-sectional area of the heat dissipation passage 111 is tapered or any other form of change from the upper opening 111a2 toward the lower opening 111a1.

Please refer to FIG. 4, which is a cross-sectional view of a heat dissipation channel according to another embodiment of the present invention. In this embodiment, the opening 111a2 above the heat dissipation channel 111 The area is smaller than the area of the lower opening 111a1. The cross-sectional area of the heat dissipation passage 111 is divergent or any other form of change from the upper opening 111a2 to the lower opening 111a1.

In addition, although the cross-sectional shape of the heat dissipation channel 111 is illustrated by a circular shape, it may be a shape composed of a straight line, a curved line, or a combination thereof, such as a polygon, an arc, or an ellipse.

Referring to FIG. 5, an external view of a light emitting device according to another embodiment of the present invention is shown. The light emitting device 200 includes an optical lens 210, a plurality of light emitting diodes 120, and a circuit board 130. The optical lens 210 is a long optical lens, and has a plurality of heat dissipation channels 111 and a long and laterally extending concave portion 210r. Each of the heat dissipation channels 111 extends from the outgoing light surface 110s1 to the inner light incident surface 110s2. The pole body 120 is provided corresponding to the recess 210r. The material of the optical lens 210 is similar to that of the optical lens 110 described above, and will not be described again. In addition, the embodiment of the present invention does not limit the number of the LEDs 120.

In another embodiment, the optical lens 210 has a plurality of concave portions 110r, and each of the heat dissipation channels 111 extends from the outgoing light surface 110s1 to the inner light incident surface 110s2 of the corresponding concave portion 110r, and each of the light emitting diodes 120 is located below the corresponding concave portion 110r. .

Please refer to FIG. 6, which is a perspective view of a light emitting device according to another embodiment of the present invention. The light emitting device 300 includes an optical lens 310, a plurality of light emitting diodes 120, and a circuit board 130.

The optical lens 310 includes a first sub-optical lens 312 and a second sub-optical lens 313, wherein the second sub-optical lens 313 is adjacent to but separated from the first sub-optical lens 312, and the first sub-optical lens 312 and the second sub-optical lens are transparent. The gap between the mirrors 313 defines a heat dissipation channel 311, wherein the heat dissipation channel 311 is a long heat dissipation channel extending laterally. In this example, the first sub-optical lens 312 is completely isolated from the second sub-optical lens 313; in another example, the partial sub-optical lens 312 may be partially connected together, and the portion may not be connected, for example, the first directly above the light-emitting diode 120. The sub-optical lens 312 and the second sub-optical lens 313 are not connected with a gap therebetween. In addition, the material of the optical lens 310 can be similar to the optical lens 110 described above, and thus will not be described again.

Referring to FIG. 7, an external view of a light emitting device according to another embodiment of the present invention is shown. The light emitting device 400 includes an optical lens 410, a plurality of light emitting diodes 120, and a circuit board 130. In this example, the plurality of optical lenses 110 can be integrally formed, bonded, assembled, or otherwise formed into an optical lens 410.

8A and 8B, FIG. 8A is an external view of a light-emitting device according to another embodiment of the present invention, and FIG. 8B is a cross-sectional view of the direction 8B-8B' in FIG. 8A. The light emitting device 500 includes a plurality of optical lenses 510, a plurality of light emitting diodes 120, and a circuit board 130.

The optical lens 510 is disposed on the circuit board 130 in pairs with the light emitting diode 120. In another example, the plurality of light emitting diodes 120 may be disposed corresponding to the same optical lens 510. In other embodiments, the number of the light emitting diodes 120 and the optical lenses 510 of the light emitting device 500 are each individual.

The optical lens 510 has a concave portion 510r, a lower surface 110b, an outgoing light surface 510s1, and a heat dissipation channel 111. The concave portion 510r extends from the lower surface 110b to the outgoing light surface 510s1 to form an inner light incident surface 110s2, and the heat dissipation passage 111 is outgoing. The smooth surface 510s1 extends to the inner light incident surface 510s2. In this example, the outgoing surface 510s1 includes upper surfaces 510s1a, 510s1b and outer sides. 510s1c. In one embodiment, the upper surface 510s1a is an upwardly convex curved surface; the upper surface 510s1b is a flat surface; and the outer side surface 510s1c is a convex curved surface, or a tapered cylindrical surface or a cylindrical surface; In another example, the outgoing light surface 510s1 may also be composed of a flat surface or a curved surface (this curved surface includes a convex curved surface, a concave curved surface, or a combination thereof).

The inner surface 510s2 includes an upper surface 510s2a and an outer surface 510s2b. The upper surface 510s2a is a downwardly concave curved surface, but may be a flat or upwardly convex curved surface, and the outer surface 510s2b is a tapered cylinder. It is a cylindrical surface or a plane.

In conclusion, the present invention has been disclosed in the above embodiments, but it is not intended to limit the present invention. A person skilled in the art can make various changes and modifications without departing from the spirit and scope of the invention. Therefore, the scope of the invention is defined by the scope of the appended claims.

100, 200, 300, 400, 500‧‧‧ illuminating devices

110, 210, 310, 410, 510‧‧‧ optical lenses

111, 311‧‧ ‧ heat dissipation channel

110b‧‧‧ lower surface

110r, 210r, 310r, 510r‧‧‧ recess

110s1, 510s1‧‧‧Out of the glossy

110s2, 510s2‧‧‧Into the glossy

110s3‧‧‧ Connection

111a1‧‧‧ opening

111a2‧‧‧Opening

111a3‧‧‧ edge

111s‧‧‧ inner wall

112‧‧‧Positioning column

113‧‧‧Positioning holes

120‧‧‧Lighting diode

120u‧‧‧Glossy

130‧‧‧ boards

312‧‧‧First sub-optical lens

313‧‧‧Second sub-optical lens

510s1a, 510s1b, 510s2a‧‧‧ upper surface

510s1c, 510s2b‧‧‧ outside side

A1‧‧‧ angle

C1‧‧‧Geometric Symmetric Center

S1‧‧‧ optical axis

RP‧‧‧ intersection

FIG. 1A is a perspective view of a light emitting device according to an embodiment of the invention.

Fig. 1B is a cross-sectional view taken along line 1B-1B' in Fig. 1A.

2 is a cross-sectional view of an optical lens in accordance with another embodiment of the present invention.

3 is a cross-sectional view of a heat dissipation channel in accordance with another embodiment of the present invention.

4 is a cross-sectional view of a heat dissipation channel in accordance with another embodiment of the present invention.

FIG. 5 is a perspective view of a light emitting device according to another embodiment of the present invention.

FIG. 6 is a perspective view of a light emitting device according to another embodiment of the present invention.

FIG. 7 is a perspective view of a light emitting device according to another embodiment of the present invention.

8A is a perspective view of a light emitting device according to another embodiment of the present invention.

Fig. 8B is a cross-sectional view showing the direction 8B-8B' in Fig. 8A.

100‧‧‧Lighting device

110‧‧‧ optical lens

111‧‧‧Solution channel

110r‧‧‧ recess

110b‧‧‧ lower surface

110s1‧‧‧Out of the glossy

110s2‧‧‧Into the glossy

120‧‧‧Lighting diode

130‧‧‧ boards

Claims (14)

An illuminating device comprising: an optical lens having a concave portion, a lower surface, an outgoing light surface and a heat dissipating passage, the concave portion extending from the lower surface toward the outgoing light surface to form an inner light incident surface, the heat dissipation The channel extends from the outgoing light surface to the inner light incident surface; and a light emitting diode is disposed corresponding to the concave portion. The illuminating device of claim 1, wherein the structure of the optical lens is symmetrical with respect to a geometrically symmetric center, and the heat dissipating passage passes through the geometric symmetry center. The illuminating device of claim 1, wherein the heat dissipation channel is a cylindrical hole or a tapered column hole. The illuminating device of claim 1, wherein the optical lens comprises: a first sub-optical lens; and a second sub-optical lens adjacent to the first sub-optical lens configuration, the first sub-optical lens and The gap between the second sub-optical lenses defines the heat dissipation channel. The illuminating device of claim 4, wherein the first sub-optical lens is completely isolated from the second sub-optical lens system. The illuminating device of claim 4, wherein the heat dissipation channel is a long heat dissipation channel extending laterally. The illuminating device of claim 1, wherein the heat dissipating channel exposes an opening on the inner light incident surface, the light emitting diode has a light emitting surface, and the light emitting surface and the optical axis of the light emitting diode At an intersection, the angle between the intersection of the intersection to the edge of the lower opening and the optical axis is substantially equal to or less than 5 degrees. The illuminating device of claim 1, wherein the optical lens is a long optical lens, the illuminating device has a plurality of the heat dissipating channels, and the heat dissipating channels extend from the ejecting surface to the inside of the recess In the light incident surface, the light emitting device includes a plurality of the light emitting diodes, and the light emitting diodes are disposed corresponding to the concave portions. The illuminating device of claim 1, wherein the optical lens is a long optical lens, the illuminating device has a plurality of the heat dissipation channels and a plurality of the concave portions, and the heat dissipation channels extend from the outgoing light surface to Corresponding to the inner light incident surface of the concave portion, the light emitting device comprises a plurality of the light emitting diodes, and the light emitting diodes are disposed corresponding to the concave portions. The illuminating device of claim 1, wherein the connection between the heat dissipation channel and the inner light entrance surface is smooth. The illuminating device of claim 1, wherein the illuminating device The middle portion of the outgoing glossy surface is recessed. The illuminating device of claim 1, wherein the illuminating surface is formed by a curved surface, a plane, or a combination thereof. The illuminating device of claim 1, further comprising: a positioning post disposed on the lower surface of the optical lens. The illuminating device of claim 13, further comprising: a circuit board, wherein the optical lens is disposed on the circuit board through the positioning post.