TW201418626A - Light emitting apparatus - Google Patents

Abstract

A light emitting apparatus includes a light emitting unit and a lens. The lens includes an accommodating part, a hollow part, and a first part. The light emitting unit is disposed in the accommodating part. The hollow part connects to the accommodating part. The first part adjacently connects to the hollow part. The first part has a reflecting surface. The present invention is advantageous for emitting wide range of light from light source including the light emitting diodes.

Description

Illuminating device

The present invention relates to a light-emitting device, and more particularly to a light-emitting device that emits a large-angle light distribution.

Light Emitting Diode (LED) is a light source with small volume, low heat generation, low power consumption and long service life. With the recent advancement in manufacturing technology, its brightness is continuously improved and its manufacturing is improved. The cost has also gradually decreased, and it has been gradually applied to various lighting equipment. In the future, light-emitting diodes are more likely to replace the existing lighting equipment and become the most important light-emitting elements in lighting equipment.

Among them, the traditional incandescent bulb has an illumination range close to 360 degrees. However, when the light-emitting diode is used as a light source in the bulb, there is a problem. Since the light emitted by the single light-emitting diode has a direction limitation, that is, the light emitted by the light-emitting diode has high directivity and the scattering angle is not large enough, the light-emitting diode is generally matched with the secondary lens (in the case of This is also referred to as a back light lens to increase the viewing angle of the light emitting diode.

In addition, when the light-emitting diode is used as the light source in the bulb, it is more necessary to provide a base for heat dissipation at the base, and the heat-dissipating base shields the light irradiation path under the bulb, so that the light-emitting angle of the bulb becomes small.

Therefore, how to provide a light-emitting device having a wide range of light distribution has become one of the important topics.

In view of the above problems, it is an object of the present invention to provide a light-emitting device having a wide range of light distribution.

To achieve the above object, a light-emitting device according to the present invention includes a light-emitting unit and a lens. The lens includes a receiving portion, a hollow portion and a first portion. The light emitting unit is disposed in the receiving portion. The hollow portion is in communication with the accommodating portion. The first portion abuts the hollow portion and has a reflecting surface.

In one embodiment, the light emitting unit has at least one light emitting diode die or at least one light emitting diode package.

In one embodiment, a portion of the light emitted by the light emitting unit is directly emitted through the hollow portion.

In an embodiment, the illumination device further includes a second portion. The second portion is coupled to the first portion of the lens and has a side.

In one embodiment, a portion of the light emitted by the illumination unit is reflected by the reflective surface and exits the lens from the side.

In an embodiment, the first portion and the second portion have a refractive surface at the interface, and the side surface and the reflecting surface are coupled via the refracting surface.

In one embodiment, a portion of the light emitted by the illumination unit is emitted by the refractive surface.

In one embodiment, the sides further have a plurality of convex lenses, concave lenses or irregular lenses.

In an embodiment, the second portion has a bottom surface. The bottom surface has a chamfer and the chamfer is located at the boundary between the bottom surface and the side surface. A portion of the light emitted by the illumination unit is refracted or reflected by the side via chamfer reflection.

According to the above description, a light-emitting device provided by the present invention has a lens, and the lens is designed to have a hollow portion and a total reflection region, so that light emitted from the light-emitting unit is refracted through the lens at different angles or The reflection can not only reduce the material cost of the lens by the design of the hollow portion, but also allow the light-emitting device to emit a large angle of light. In addition, when the light-emitting device is applied to the light bulb as a light source, the dark area caused by the light partition and the distance between the lens tip and the bulb is brightened, thereby improving the shadow problem of the bulb.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a light-emitting device according to a preferred embodiment of the present invention will be described with reference to the accompanying drawings, wherein the same elements will be described with the same reference numerals.

1A is a schematic cross-sectional view of a light emitting device according to a preferred embodiment of the present invention, and FIG. 1B is a cross-sectional view of a light emitting device of FIG. 1A. Referring to FIG. 1A and FIG. 1B simultaneously, the light-emitting device M includes at least one light-emitting unit 1 and a lens 2, and the lens 2 covers the light-emitting unit 1. In the present embodiment, the illuminating device M is exemplified by including a illuminating unit 1. However, in practical applications, the illuminating device M may further include two or even more illuminating units 1 to increase the overall Brightness. In addition, the light-emitting device M of the present invention is applied to a light bulb as an example. In this embodiment, the light-emitting unit M is disposed on the circuit board P, and the appearance of the light-emitting device M is substantially a disc type. The configuration is taken as an example. However, in practical applications, as shown in FIG. 1C, the light-emitting device M may also be a long strip. The present invention is not limited thereto. Hereinafter, each structural feature of the light-emitting device M will be described one by one.

The light-emitting unit 1 is a surface mount device (SMD) light-emitting diode package. However, in practical applications, the light-emitting unit 1 can also be a light-emitting diode die (die). This is not limited. In addition, in the embodiment, the light-emitting unit 1 is a surface-adhesive light-emitting diode package having a single light-emitting diode chip. However, the number of the light-emitting diode chips is not limited, and the number of the light-emitting diode chips may be two crystals. The tri-crystal or even the multi-wafer package is used depending on the illuminating effect required for the illuminating device M.

The lens 2 is formed by an injection process, and has a receiving portion 24, and the receiving portion 24 is a concave structure, and the light emitting unit 1 is disposed in the receiving portion 24. The lens 2 further has a hollow portion 21 which is provided corresponding to the accommodating portion 24, for example, oppositely, so that the hollow portion 21 and the accommodating portion 24 can communicate with each other. For example, the hollow portion 21 may have a round hole in a plan view. In this way, part of the light emitted by the light-emitting unit 1 can be directly emitted from the hollow portion 21. In the present embodiment, the accommodating portion 24 is configured to receive and dispose the illuminating unit 1 , and the side wall 211 of the hollow portion 21 is in the shape of a plane. However, in the practical application, the side wall 211 may also be The shape of the end light-emitting device M is required to be matched with a pointed or curved shape, and the present invention is not limited thereto.

The main function of the lens 2 is to cause the light from the light-emitting unit 1 to be reflected or refracted through different regions of the lens 2, and then emitted by the lens 2, thereby adjusting the light shape. In detail, the light-emitting device M of the present invention includes the first portion 22 and the second portion 23 in addition to the hollow portion 21 described above, wherein the first portion 22 abuts the hollow portion 21 and the second portion 23 connects the first portion twenty two. Hereinafter, the light-emitting device M is placed in one of the bulbs G, and each region of the lens 2 will be described in detail. It should be noted that there may be a plurality of light-emitting devices M in the bulb, and one is taken as an example.

1D is a schematic view showing a light path of light incident on a hollow portion of a light-emitting unit in a light-emitting device according to a preferred embodiment of the present invention. Referring to FIG. 1D, since the lens 2 has the hollow portion 21, part of the light from the light-emitting unit 1 can be directly emitted through the hollow portion 21. In detail, part of the light from the light-emitting unit 1 is directly emitted through the hollow portion 21 to the upper region of the lens 2, as in the tapered region covered by the broken lines T1 and T2 in FIG. 1D. Through the design of the hollow portion 21, the material of the lens 2 can be reduced to reduce the cost.

1E is a schematic view showing a light path of a light-emitting unit in which a light is incident on a first portion in a light-emitting device according to a preferred embodiment of the present invention. Referring to FIG. 1E, the first portion 22 has a reflecting surface 221, and the reflecting surface 221 is connected to the sidewall 211 of the hollow portion 21. A part of the light from the light-emitting unit 1 is refracted through a first light-incident surface 241 located in the accommodating portion 24, and internal total reflection is generated via the reflecting surface 221 of the first portion 22, and is then refracted through the side surface 231. The first light incident surface 241 is adjacent to the hollow portion 21 . The first portion 22 can totally reflect part of the light emitted by the light-emitting unit 1 and emit it in the direction of the two sides, thereby expanding the illumination angle of the light-emitting unit 1. The light-emitting device M can meet the requirement of a large viewing angle for product specifications. .

FIG. 1F is a schematic view showing a light path of light incident on a refracting surface of a light-emitting unit in a light-emitting device according to a preferred embodiment of the present invention; FIG. Please refer to FIG. 1E and FIG. 1F simultaneously. In this embodiment, the first part 22 and the second part The intersection 23 has a refractive surface 27, that is, the side surface 231 and the reflection surface 221 are coupled via a refractive surface 27. A portion of the light from the light-emitting unit 1 is refracted through a second light-incident surface 242 located in the accommodating portion 24, and is refracted through the refracting surface 27. The second light-incident surface 242 is connected to the first light-incident surface 241, and the transparent surface 27 can be made brighter due to the light partition and the distance between the sharp point of the lens 2 and the bulb G, thereby improving the bubble. The shadow problem of the shell G, and through the design of the refracting surface 27, also allows the emitted light region to be close to the light emitted by the hollow portion 21. In particular, the surface of the side surface 231 can be slightly atomized to make the light scattering more uniform.

According to the above description, with the lens 2 design of the present invention, the light distribution of the light-emitting device M can be made greater than 180 degrees, even close to 360 degrees. In this way, the light-emitting device M of the present invention can have a large pitch when disposed adjacently, thereby reducing the amount of use of the light-emitting device M per unit area, and thereby greatly reducing the cost of the system using the light-emitting device M. More preferably, when the light-emitting device M of the present invention is applied to a light bulb, the range of light divergence can be effectively increased, and the light irradiation path blocked by the heat dissipation base can be compensated for.

In addition, in the prior art, in the adjacent light-emitting devices, the problem of uneven energy intensity and faint area is likely to occur at the light junction of the large-angle area. To solve the above problem, please refer to FIG. A schematic diagram of a light path of a light-emitting device M1 according to a preferred embodiment of the present invention, the lens 2a further has a bottom surface 25a and a chamfer 26a. The accommodating portion 24a is disposed on the bottom surface 25a, and the chamfer 26a is located at the intersection of the bottom surface 25a and the side surface 231a. The boundary. Through the setting of the chamfer 26a, the large-angle light emitted from the light-emitting unit 1a can be internally totally reflected by the chamfer 26a, and then refracted and/or reflected through the side surface 231a to reinforce the boundary of the adjacent light-emitting device M1. The problem of insufficient brightness. The design of the chamfer 26a can reduce the problem of uneven energy intensity and bright and dark lines at the junction of the adjacent light-emitting devices M1.

In addition, in this embodiment, the light-emitting device M1 is further provided with a column I on the bottom surface 25a, so that the light-emitting device M1 can be locked in the circuit board P, which is advantageous for the light-emitting device M1 to be elastically disassembled or replaced.

3A and 3B are respectively schematic cross-sectional views showing different aspects of a second portion of a light-emitting device according to a preferred embodiment of the present invention. Referring to FIG. 3A and FIG. 3B simultaneously, in the embodiment, the light-emitting devices M2 and M3 respectively have substantially the same structure and features as the light-emitting device of the foregoing embodiment, but the side surface 231b of the second portion 23b of the light-emitting device M2 is The side surface 231c of the second portion 23c of the light-emitting device M3 is concave and divergent. Through the above configuration, the above design can further assist the light extraction at a large angle to reduce the boundary between adjacent light-emitting devices. It is easy to produce problems with uneven energy intensity and dim areas.

4A and 4B are top views respectively showing different aspects of a light-emitting device according to a preferred embodiment of the present invention. 4A and 4B are substantially the same as the illuminating device M of the previous embodiment, except that the variation in the side structure of the illuminating device is further described. Referring to FIG. 1F at the same time, the side surface 231 of the light-emitting device M is a flat and smooth surface, and the side surface 231d of the light-emitting device M4 shown in FIG. 4A has a plurality of continuous concave lenses, and the side of the light-emitting device M5 shown in FIG. 4B 231e has complex A number of continuous convex lenses, of course, the side surface of the light-emitting device may also have a convex lens and a concave lens, and the convex lens and the concave lens may also be arranged at intervals rather than continuously.

FIG. 5 is a schematic view showing the appearance of a light bulb of a light-emitting device according to a preferred embodiment of the present invention. In the present embodiment, the structure and features of the light-emitting device M are substantially the same as those of the foregoing light-emitting device, and details are not described herein. By actually applying the light-emitting device M to the bulb B, it is possible to have the above-described effects. It should be noted that there may be a plurality of light-emitting devices in the bulb, and one is taken as an example.

In summary, the present invention provides a light-emitting device having a lens that is designed to have a hollow portion and a total reflection region, so that light emitted from the light-emitting unit is refracted at different angles through the lens. The reflection can not only reduce the material cost of the lens by the design of the hollow portion, but also allow the light-emitting device to emit a large angle of light. In addition, when the light-emitting device is applied to the light bulb as a light source, the dark area caused by the light partition and the distance between the lens tip and the bulb is brightened, thereby improving the shadow problem of the bulb.

The above is intended to be illustrative only and not limiting. Any equivalent modifications or alterations to the spirit and scope of the invention are intended to be included in the scope of the appended claims.

1, 1a‧‧‧Lighting unit

2, 2a‧‧ lens

21‧‧‧ Hollow

211‧‧‧ side wall

22‧‧‧Part 1

221‧‧‧reflecting surface

23, 23b, 23c‧‧‧ part two

231, 231a, 231b, 231c, 231d, 231e‧‧‧ side

24, 24a‧‧‧ 容 部

241‧‧‧ first light surface

242‧‧‧Second entrance

25a‧‧‧ bottom

26a‧‧‧Chamfering

27‧‧‧Refractive surface

B‧‧‧Light bulb

G‧‧‧Bubble

I‧‧‧Cylinder

M, M1, M2, M3, M4, M5‧‧‧ illuminating devices

P‧‧‧PCB

T1, T2‧‧‧ dotted line

1A is a schematic perspective cross-sectional view of a light emitting device according to a preferred embodiment of the present invention; 1B is a schematic cross-sectional view of a light-emitting device of FIG. 1A; FIG. 1C is a perspective cross-sectional view of a light-emitting device according to a preferred embodiment of the present invention; FIG. 1 is a schematic diagram of an optical path of light incident on a first portion of a light-emitting unit in a light-emitting device according to a preferred embodiment of the present invention; FIG. 1F is a schematic view of a preferred embodiment of the present invention; FIG. 2 is a schematic diagram of a light path of a light-emitting device according to a preferred embodiment of the present invention; FIG. 3A is a schematic diagram of a light-emitting device according to a preferred embodiment of the present invention; FIG. 3B is a schematic cross-sectional view showing a different aspect of a second portion of a light-emitting device according to a preferred embodiment of the present invention; FIG. 4A is a different embodiment of a light-emitting device according to a preferred embodiment of the present invention; 4B is a plan view of a different aspect of a light-emitting device according to a preferred embodiment of the present invention; and FIG. 5 is a preferred embodiment of the present invention. A schematic view of the appearance of a light bulb of a light-emitting device of the embodiment.

1‧‧‧Lighting unit

2‧‧‧ lens

21‧‧‧ Hollow

211‧‧‧ side wall

22‧‧‧Part 1

23‧‧‧Part II

24‧‧‧ 容部

M‧‧‧Lighting device

Claims (9)

A light-emitting device comprising: a light-emitting unit; and a lens comprising: a receiving portion, the light-emitting unit is disposed at the receiving portion; a hollow portion communicating with the receiving portion; and a first portion adjacent to the hollow portion And has a reflective surface. The illuminating device of claim 1, wherein the illuminating unit has at least one illuminating diode die or at least one illuminating diode package. The illuminating device of claim 1, wherein a part of the light emitted by the illuminating unit is directly emitted through the hollow portion. The illuminating device of claim 1, further comprising: a second portion coupled to the first portion of the lens and having a side surface. The illuminating device of claim 4, wherein a part of the light emitted by the illuminating unit is reflected by the reflecting surface, and the lens is emitted from the side. The illuminating device of claim 4, wherein the first portion and the second portion have a refracting surface, and the side surface is coupled to the reflecting surface via the refracting surface. The illuminating device of claim 6, wherein a part of the light emitted by the illuminating unit is emitted from the refracting surface. The illuminating device of claim 1, wherein the side More complex lens, concave lens or irregular lens. The illuminating device of claim 1, wherein the second portion has a bottom surface, the bottom surface has a chamfer, and the chamfer is located at a boundary between the bottom surface and the side surface, and a portion of the light emitting unit is emitted. Light is reflected or reflected by the side by reflection of the chamfer.