KR20230144350A - Lighting apparatus preventing light from being spread - Google Patents

Abstract

The present invention relates to a light-emitting device that can prevent light from spreading. A groove formed on the outer periphery of a lens member having a half dome shape capable of controlling the beam angle and a guide having a shape corresponding to the groove in a cover member fastened to the lens member are aligned and combined. This has the excellent effect of improving visibility and preventing light from spreading by physically blocking the light emitted from the light emitting device in the lateral direction rather than the vertical direction of the light emitting surface.

Description

Lighting apparatus preventing light from being spread}

The present invention relates to a light-emitting device that can prevent light from spreading. More specifically, a groove formed on the outer periphery of a lens member having a half dome shape capable of controlling the beam angle, and a shape corresponding to the groove in a cover member fastened to the lens member. It relates to a light-emitting device that can prevent light from spreading by physically blocking light emitted from a light-emitting device in a lateral direction rather than perpendicular to the light-emitting surface by aligning and combining guides.

As described above, the main feature is that the display characteristics of the light-emitting device using this can be further improved because light spreading can be prevented by physically blocking the light emitted from the light-emitting device in the side direction.

In general, a light emitting device package is a light emitting device in which a light emitting device chip such as a light emitting diode (LED) is mounted on a support member made of a substrate or lead frame, and the top of the light emitting device chip is covered with a dome-shaped lens, etc. A device package is being used.

When using such a typical dome-shaped lens, there are limitations in controlling the beam angle. For this reason, the present applicant has found that, as shown in Patent Document 001 below, a lens member having a half dome shape is combined with a beam angle control member to control the light emission characteristics so as to have a desired beam angle, as well as to prevent unnecessary light radiation from occurring. A light-emitting device package that can reduce light pollution and a light-emitting device using it have been presented.

However, although the light emitting device of the prior art is capable of controlling the beam angle, a problem may occur in which the light emitted in the side direction of the light emitting device chip spreads.

In consideration of the above problem, the present invention requires a light emitting device capable of adjusting the beam angle, and an appropriate structure of the light emitting device that can prevent light emitted toward the side of the internal light emitting device chip from spreading.

Korean Patent Publication No. 10-2305219 (registered on September 16, 2021)

The present invention was conceived to solve the problem described above, and is designed to control the beam angle of light emitted from a light emitting device chip and to prevent blurring and unnecessary overlap of light emitted in the side direction of the light emitting device chip. The purpose is to provide a device.

Another purpose is to provide a light emitting device that can improve the quality of light emitted from a light emitting device chip and efficiently control the beam angle in a specific direction, thus improving visibility and reducing light pollution.

As an embodiment for solving the above-described problem, there is a light emitting device capable of preventing light from spreading, comprising: a light emitting device package 210 including a light emitting device chip mounted on a support member; a lens member 220 that refracts the light emitted from the light emitting device package 210 to form a beam angle; Includes a cover member 230 coupled on the lens member 220, wherein a plurality of the light emitting device packages 210 are arranged to be spaced apart from each other, and the lens member 220 is located between adjacent light emitting device packages 210. It includes a groove 222 formed on the outer periphery of the lens member 220 in the connection area, and the cover member 230 has a shape corresponding to the groove 222 and has a guide ( 232) is formed, and the guide 232 is integrally fitted and coupled to the groove 222, thereby preventing the light emitted in the side direction of the light emitting device package 210 from spreading.

Meanwhile, means for solving other specific problems according to the present invention are described in the detailed description of the invention.

According to the light emitting device according to the present invention, by adopting a structure related to the lens member and the cover member linked to the beam angle control member, blurring and unnecessary overlap of light can be prevented, and thus the overall quality of light output can be improved.

In addition, beam angle control in a specific direction can be efficiently performed, which has the effect of improving visibility and reducing light pollution.

Figure 1 is a schematic cross-sectional view of a light-emitting device 100 corresponding to the prior art, in which a lens member 120 and a cover member 130 are sequentially combined on a light-emitting device package 110. This is a cross-sectional view of .
Figure 2 shows an embodiment of the present invention, in which the groove 222 of the lens member 220 and the guide 232 of the cover member 230 are integrally fitted to prevent light from spreading between adjacent light emitting device packages 210. This is a cross-sectional view of the light emitting device 200.
Figure 3 is an enlarged cross-sectional view of the lens member 220 and the light-emitting device package 210 in the light-emitting device 200 according to an embodiment of the present invention.
Figure 4 is a diagram illustrating the lens member 220 and the cover member 230 that are aligned immediately before being combined with the light emitting device 200 according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in more detail with reference to the attached drawings. The embodiments of the present invention may be modified in various forms, and the scope of the present invention should not be construed as limited by the examples below. This embodiment is provided to more completely explain the present invention to those with average knowledge in the relevant technical field. Therefore, the shapes and detailed configurations of elements in the drawings have been simplified for explanation. It should be noted that the terms used in this specification are terms used to appropriately express preferred embodiments of the present invention.

In addition, when describing with reference to the attached drawings, components of the same embodiment are given the same reference numerals regardless of the reference numerals, and duplicate descriptions related thereto are omitted. In explaining the present invention, if a detailed description of the known technology may unnecessarily obscure the gist of the present invention, the description thereof will be omitted.

Cross-sectional views of the completed state of the light-emitting device capable of preventing light spread according to the present invention and the aligned state immediately before the lens member and the cover member are combined are shown in Figures 2 and 4, and the light-emitting device An enlarged cross-sectional view of the lens member 220 and the light emitting device package 210 at 200 is shown in FIG. 3.

First, as shown in FIGS. 2 and 3, the light emitting device 200 capable of preventing light spread, which is a preferred embodiment of the present invention, is designed to control the beam angle of light emitted from the light emitting device chip 212. A lens member 220 formed to have a half-dome shape on the light emitting device package 210 including the beam angle control member 214, and a grill formed on the light emitting device package 210 to physically protect the lens member 220. It includes a cover member 230.

Specifically, as shown in Figure 3, the light emitting device package 210, which can adjust the beam angle, reflects the light emitted from the light emitting device chip 212 mounted on a support member such as a printed circuit board or lead frame and directs it. Surrounding the light emitting device chip 212 in the space between the reflecting member 215 and the beam angle control member 214, which act to form an angle, and the reflection member 215 and the beam angle control member 214. It includes a formed molding member 218, and a lens member 220 formed on the upper side thereof. Here, the right side of the molding member 218 and the left side 216 of the beam angle control member 214 may be formed in close contact. However, taking note of the fact that luminance deviation occurs due to the surface tension of the resin injected when forming the molding member 218, it is also possible to form the molding member 218 at a certain distance apart. For example, the separation distance d1 is at least about 0.05 mm. It is desirable to maintain and form it. In addition, considering the contraction and expansion of the lens member 220 and the beam angle control member 214, the reflective surface 216 of the beam angle control member 214 is extended to form a virtual surface that meets the uppermost surface of the lens member 220. The surface is relatively to the left of the vertical surface extending downward from the boundary surface where the first and second regions meet on the uppermost surface of the lens member 220, and the separation distance (d2) between these virtual surfaces and the vertical surface is approximately 0.3 mm. It is most desirable to form it (based on module 300 mm x 300 mm).

At least one light emitting device chip 212 may be mounted on a support member in the internal mounting space of the light emitting device package 210. Here, the light emitting device chip 212 is selectively selected from among various light emitting devices including red (R), green (G), and blue (B), which are the three primary colors of light, to suit the required use, and is mounted spaced apart in plural numbers, or is mounted as needed. Accordingly, at least one light emitting device chip, including a white (W) light emitting device chip, may be included.

In addition, the lens member 220 formed to have a half-dome shape on the light-emitting device package 210 includes a first region having a cross-sectional shape with a specific curvature to correspond to the position where light is emitted from the light-emitting device chip 212, and It has a second area that has a curvature different from that of the half dome or has a straight line shape with a specific angle or multiple angles. Here, among the plurality of semiconductor packages 210, a lens member 220 is formed between adjacent semiconductor packages 210 to prevent light from spreading through the lens member 220 formed between adjacent semiconductor packages 210. ) is characterized in that a groove 222 is formed on the outer periphery. This groove 222 is formed to have a shape corresponding to that of the guide 232 of the cover member 230, which will be described later, so that it can be integrated with it (see Figure 4).

The grooves 222 may be formed only at a specific location in the connection area between the lens member 220 and the semiconductor package 210, but may be formed singly or in plurality at locations as close as possible to each semiconductor package 210. And, in another embodiment, the groove 222 may be formed only at the location where the reflective member 215 is formed in the connection area. As another embodiment, if the strength of the lens member 220 is sufficient, the groove 222 may be formed over most of the upper surface of the connection area. Additionally, the cross-sectional shape of the groove 222 formed in the lens member 220 can be selected from various examples such as square and trapezoid.

Meanwhile, the groove 222 formed to prevent light from spreading is located on the uppermost surface of the lens member 220 at a specific location in the connection area to prevent problems such as bending or breaking in the connection area of the lens member 220. It is preferable that it is formed to a depth of at least 1 mm. For example, when the thickness of the lens member 220 in the connection area is about 2.75 mm, the depth of the groove 222 may be about 1 mm. In addition, the top surface of the lens member 220 in the connection area may be formed to match the top surface of the reflection member 215 included in the light emitting device package 210 to some extent, and the lowest point surface formed inside the groove 222 It is preferable that it be formed deeper than the uppermost surface of the reflective member 215.

The cover member 230 formed by being coupled to the lens member 220 to physically protect the lens member 220 is as shown in FIG. 2 so that at least the light emitted from the light emitting device package 210 can be sufficiently emitted. formed together. A guide 232 is formed at the lower part of the cover member 230 having a position and shape corresponding to the groove 222 of the lens member 220 to prevent light from spreading through the lens member 220, and The guide 232 is integrally fitted and coupled to the groove 222.

Next, the light emitting device 200 including the lens member 220 and the cover member 230 is aligned and formed as shown in FIG. 4. That is, after manufacturing the lens member 220 and the cover member 230 separately, the guide 232 of the cover member 230 and the groove 222 of the lens member 220 are positioned so that they can be integrally coupled. Then, the light emitting device 200 as shown in FIG. 2 can be manufactured by fitting them together. Here, the lens member 220 and the cover member 230 are made of polycarbonate (PC) and can be manufactured using a die casting device with a mold cavity corresponding to each shape. In addition, this technology It can be manufactured using general techniques widely known in the field.

The beam angle control member 214 for beam angle control may be made of a material different from the material of the lens member 220, taking comprehensive consideration of reflection characteristics and optimal luminance characteristics. The beam angle control member 214 and the reflection member 215 are high-strength materials that are light and resistant to external shocks, have excellent heat resistance, durability and reflectivity, and can be selected from a variety of materials that are not affected by temperature changes or moisture. , for example, may be formed of polyphthalamide (PPA) or polycyclohexyleneterephthalate (PCT).

Meanwhile, the width (w) of the beam angle control member 214 is not particularly limited, but is preferably as narrow as possible (e.g., approximately 0.30 mm), and the height (h) of the beam angle control member 214 is It may be influenced by the separation distance d1 between the light emitting device chip 212 and the beam angle control member 214, and should be formed to a size larger than the thickness of the light emitting device chip 212, preferably The height (h) of the beam angle control member 214 may be at least twice the thickness of the light emitting device chip 212, and more preferably in the range of 3 to 10 times. As an example, the separation distance (d3) between the reflective surface 216 of the beam angle control member 214 and the closest surface of the light emitting device chip 212 is 0.36 mm, and the thickness of the light emitting device chip 212 is 0.1 mm. In this case, the height of the beam angle control member 214 may have a value of approximately 0.7 mm.

The light-emitting device that can prevent light from spreading as discussed above may be a light-emitting device such as various display devices such as outdoor electronic signboards and road electronic signs.

The position where the first and second regions of the lens member 220 described above meet, the material, height and shape of the beam angle control member 214, the closest surface of the light emitting device chip 212 and the half of the beam angle control member 214 It should be understood that the relative arrangement between these components, such as the separation distance (d3) between the slopes 216, can be changed in various designs depending on the optimal or optimal beam angle characteristics.

The light emitting device capable of preventing light from spreading of the present invention includes a process of optimizing the arrangement of these components, a design of the half dome of the lens member 220, and the groove 222 of the lens member and the guide 232 of the cover member. By adopting it, blurring and unnecessary overlap of light can be prevented, so the overall quality of light output can be improved, and beam angle control in a specific direction can be efficiently performed, improving visibility and reducing light pollution. have

The present invention is described with reference to the embodiments shown in the drawings, but these are illustrative, and those skilled in the art will understand that various modifications and other equivalent embodiments are possible therefrom. You will understand. And it is obvious that the true technical protection scope of the present invention is determined by the claims below.

200: light emitting device 210: light emitting device package
212: light emitting device chip 214: beam angle control member
215: reflective member 216: reflective surface
218: molding member 220: lens member
222: Groove 230: Cover member
232: Guide

Claims (7)

In the light emitting device 200 that can prevent light from spreading,
a light emitting device package 210 including a light emitting device chip mounted on a support member;
a lens member 220 that refracts the light emitted from the light emitting device package 210 to form a beam angle;
Includes a cover member 230 coupled on the lens member 220,
The light emitting device package 210 is arranged to be spaced apart from each other,
The lens member 220 includes a groove 222 formed on the outer periphery of the lens member 220 in the connection area between adjacent light emitting device packages 210,
A guide 232 is formed in the lower part of the cover member 230 in a shape corresponding to the groove 222, and
The light emitting device 200 is characterized in that the guide 232 is integrally fitted and coupled to the groove 222 to prevent light from being emitted in the side direction of the light emitting device package 210.
According to paragraph 1,
A light emitting device (200), characterized in that the depth of the groove (222) is at least 1.0 mm.
According to claim 1 or 2,
The lens member 220 has a half-dome shape on the upper side of the light-emitting device package 210 and controls the beam angle of light emitted from the light-emitting device chip 212 included in the light-emitting device package 210. A light emitting device (200) characterized in that a beam angle control member (214) is formed on the upper side of the support member to enable the light emitting device (200).
According to paragraph 3,
The light-emitting device 200 is characterized in that the reflective surface 216 of the beam angle control member 214 is arranged to be spaced apart from the nearest side of the light-emitting device chip 212.
According to paragraph 4,
The light emitting device 200 is characterized in that the light emitting device chip 212 is composed of one piece or at least two of them are arranged spaced apart from each other.
According to claim 1 or 2,
The cross-sectional shape of the second region of the lens member 220, excluding the first region where the half dome is formed, is a shape having a different radius of curvature from the half dome or a straight cross-sectional shape with a certain angle. Device (200).
According to clause 6,
The left side 216 of the beam angle control member 214 is relatively to the left of the vertical plane extending downward from the boundary formed by the meeting of the first and second regions on the uppermost surface of the lens member 220, A light emitting device (200) characterized in that the separation distance (d2) between these virtual planes and the vertical plane is at least 0.3 mm.