KR101894041B1 - Light emitting device and light emitting module comprising the same - Google Patents

Abstract

A light emitting module is disclosed. The light emitting module includes a PCB (Printed Circuit Board), a light emitting element mounted on the PCB, and an optical lens having a lens portion. The lens portion of the optical lens is located above the light emitting element. The optical lens further includes a plurality of legs coupled to the PCB along with the lens portion. The light emitting element includes a plurality of fitting grooves formed in correspondence with the plurality of leg portions.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a light emitting device,

The present invention relates to a light emitting device based on a light emitting diode and a light emitting module including the same.

Generally, the light emitting device includes a package body having a lead frame and a light emitting diode chip mounted on the package body. The light emitting diode chip is electrically connected to the terminals of the lead frame on the package body. Typically, the package body includes a cavity for receiving the light emitting diode chip, and the light emitting diode chip is mounted on the cavity bottom. The cavity may be filled with an encapsulating material containing a transparent resin.

Typically, the light emitting module includes a light emitting element and a printed circuit board (PCB) on which the light emitting element is mounted. Also, as a conventional light emitting module, there is a light emitting module in which an optical lens, commonly referred to as a 'secondary optical lens', is mounted on a PCB to cover the top of the light emitting device.

In the conventional light emitting module, the optical lens includes a lens portion and a plurality of leg portions formed on the bottom surface of the lens portion. The upper portion of the lens portion is formed into a specific shape that diffuses light or improves the light distribution characteristic of light. The plurality of lens portions are coupled onto the PCB to separate the lens portion from the PCB. Since the lens portion is spaced apart from the PCB, the reflection film on the PCB contributes to widening the directivity angle by spreading the light advancing toward the back of the light emitting element forward and forward, thereby causing stain caused by heat at the contact surface caused when the lens portion comes into direct contact with the PCB And the like can be prevented.

After the light emitting device is mounted on the PCB, the optical lens is coupled to the PCB corresponding to the light emitting device to manufacture the light emitting module. To attach the optical lens to the PCB, the bottom of the legs is bonded Or a method in which a leg portion is fitted to a hole formed in a PCB is adopted. When the adhesive is used, the adhesive is applied with a dispenser, and then the optical lens is bonded using a mounter. At this time, there is a limit to precisely align the center of the optical lens and the light emitting element due to the tolerance of the mount equipment. Also, in the method of fitting the optical lens by inserting the leg portion into the hole formed in the PCB, it is difficult to precisely match the center of the optical lens and the light emitting element due to the PCB router tolerance.

It is an object of the present invention to provide a light emitting module in which the positional accuracy of the optical lens with respect to the light emitting element is further improved.

Another problem to be solved by the present invention is to provide a light emitting device including shapes corresponding to the legs of an optical lens so as to enhance the accuracy of mounting position of the optical lens.

A light emitting module according to an aspect of the present invention includes: a printed circuit board (PCB); A light emitting device mounted on the PCB; And a lens portion, wherein the lens portion is located on the light emitting element. The optical lens further includes a plurality of legs coupled to the PCB, and the light emitting device includes a plurality of fitting grooves formed in correspondence with the plurality of legs.

According to one embodiment, each of the plurality of fitting grooves is formed in each of four corners of a square or a rectangle, and the plurality of legs may be arranged in a square or a rectangle so as to correspond to the plurality of fitting grooves.

According to one embodiment, each of the plurality of fitting grooves includes a pair of fitting surfaces, and each of the plurality of leg portions can be fitted to the fitting groove so as to contact the pair of fitting surfaces.

According to one embodiment, each of the legs includes a cylindrical shape having a circular outer circumferential surface, and the fitting groove includes a pair of fitting surfaces perpendicular to each other, and the pair of fitting surfaces are formed on an outer peripheral surface In the form of a tangent line.

According to one embodiment, the pair of mating surfaces may comprise an inclined surface.

According to an embodiment of the present invention, a light incidence groove is formed at the center of the bottom of the lens unit so as to be positioned directly on the light emitting device, and the upper surface of the lens unit is formed with a concave portion having a curved surface at a central region, And a side surface of the lens portion may be a cylindrical surface.

According to one embodiment, a scattering pattern may be formed on a side surface of the lens portion.

According to an embodiment, a plurality of light emitting element-optical lens sets, in which the light emitting element and the optical lens are paired, may be arranged in a predetermined array on the PCB.

According to an embodiment, the light emitting device includes a package body, a light emitting diode chip mounted on the package body, first and second light emitting diode chips supported on the package body and electrically connected to the light emitting diode chip on the package body, 2 terminals.

According to one embodiment, each of the plurality of fitting grooves may be formed vertically from the upper surface of the package body at the four corners of the package body to the bottom surface of the package body.

According to another aspect of the present invention, there is provided a light emitting element for use in an optical lens having a plurality of leg portions. The light emitting device includes a light emitting diode chip and a package body on which the light emitting diode chip is mounted. The package body includes a plurality of fitting grooves that are fitted to each of the plurality of leg portions. According to one embodiment, each of the plurality of aligned grooves is formed in each of the four corners of the package body. According to one embodiment, each of the plurality of fitting grooves includes a pair of fitting surfaces that abut the leg portions. According to one embodiment, the pair of mating surfaces may be at right angles to each other. According to one embodiment, a round surface may be formed between the pair of mating surfaces. According to one embodiment, each of said pair of mating surfaces may comprise an inclined surface. The fitting groove may be formed vertically from an upper surface of the package body to a bottom surface of the package body.

According to the present invention, when a light emitting element and an optical lens including a plurality of leg portions are used together, the light emitting element is provided with fitting holes that fit into the plurality of leg portions, The positional accuracy of the optical lens with respect to the light emitting element can be further improved.

1 is a perspective view illustrating a light emitting module according to an exemplary embodiment of the present invention.
FIG. 2 is an exploded perspective view of the light emitting module shown in FIG. 1; FIG.
FIG. 3 is a bottom view of the light emitting module shown in FIGS. 1 and 2, with the PCB omitted. FIG.
Fig. 4 is a side view showing the light emitting module shown in Figs. 1 to 3, and is a side view showing part of the invisible components in a hidden line. Fig.
FIG. 5 is a perspective view illustrating a light emitting device applied to the light emitting module shown in FIGS. 1 to 4. FIG.
6 is a plan view showing a state in which a fitting groove of the light emitting element and a fitting groove of the optical lens are aligned with each other;
7 is a view for explaining another embodiment of the present invention.
8 is a plan view showing a light emitting module according to an embodiment of the present invention in which a plurality of light emitting devices and a plurality of optical lenses are arranged on a PCB.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The following embodiments are provided by way of example so that those skilled in the art can fully understand the spirit of the present invention. Therefore, the present invention is not limited to the embodiments described below, but may be embodied in other forms. In the drawings, the width, length, thickness, and the like of the components may be exaggerated for convenience. Like reference numerals designate like elements throughout the specification.

FIG. 1 is an exploded perspective view illustrating a light emitting module according to an embodiment of the present invention, FIG. 2 is an exploded perspective view illustrating the light emitting module shown in FIG. 1, and FIG. 3 is a cross- FIG. 4 is a side view showing the light emitting module shown in FIGS. 1 to 3, and FIG. 5 is a cross-sectional view of the light emitting module shown in FIGS. 1 to 4 And FIG. 6 is a perspective view showing the applied light emitting device.

1 to 4, a light emitting module according to an embodiment of the present invention includes a PCB 2, a light emitting device 4 mounted on the PCB 2, And an optical lens 6 mounted on the light emitting element 4 to cover the upper portion of the light emitting element 4. [

The PCB 2 includes conductive land patterns to which the terminals of the light emitting device 4 are bonded on the upper surface. In addition, the PCB 2 may include a reflective film on the upper surface thereof. The PCB 2 may be a metal core PCB (MCPCB) based on a metal having good thermal conductivity. Also, the PCB 2 may be based on an insulating substrate material such as FR4. Although not shown, a heat sink may be installed under the PCB 2.

The light emitting device 4 includes a package body 42 and a light emitting diode chip 44 mounted on the package body 42 as best shown in FIG. The light emitting device 4 includes first and second terminals 43a and 43b supported by the package body 42. [ The package body 42 may be formed by injection molding a plastic resin such as PA or PPA. In this case, the package body 42 can be formed in a state of supporting the first and second terminals 43a and 43b by the injection molding process.

The first and second terminals 43a and 43b are spaced apart from each other in the package body 42. The first and second terminals 43a and 43b extend outside the package body 42 and are bonded to a land pattern on the PCB 2 (see FIGS. 1, 2 and 4) from the outside of the package body 42 .

A cavity 420 for exposing the first and second terminals 43a and 43b in the upper direction is formed at the center of the upper surface of the package body 42. [ The light emitting diode chip 44 is located at the bottom of the cavity. In order to protect the light emitting diode chip 44 and the wirings connected to the light emitting diode chip 44, a light transmitting encapsulant 45 may be formed in the cavity. The encapsulation material 45 may serve as a primary optical lens. The encapsulant 45 may have a top surface on which light is emitted, for example, a flat surface or a convex surface.

A phosphor for wavelength conversion of the light emitted from the light emitting diode chip 44 may be provided inside or outside the sealing material 45 or on the light emitting diode chip 44.

The light emitting device 4 includes four fitting grooves 422 formed on the outer side surface of the package body 42. The four fitting grooves 422 are formed at the four corners of the package body 42. Each of the four fitting grooves 422 is vertically formed over the entire height of the package body 42 from the upper surface of the package body 42 to the bottom surface of the package body 42. In this embodiment, the four fitting grooves 422 are located at the four corners of a rectangle, more preferably a square. Therefore, one fitting groove 422 faces the other fitting groove 422 in both the diagonal direction, the back-and-forth direction, and the left-right direction.

Referring again to Figs. 1 to 4, the optical lens 6 includes a lens portion 62 and four leg portions 64. The optical lens 6 may have various functions and various characteristics depending on the shape of the lens part 62. [ In this embodiment, the optical lens 6 is composed of a diffusion lens that diffuses and emits light of the light emitting element 4 widely and uniformly.

The bottom surface of the lens portion 2 is formed in a substantially circular plane. 4, the optical lens 6 has a substantially concave, horn-like or semi-spherical concave shape at the position corresponding to the light emitting element 4 at the center of the bottom of the lens portion 62 Incident groove 621 is included. The vertex of the light incident groove 621 passes the center axis of the optical lens 6. A fresnel pattern or a concavo-convex pattern 623 for optical purpose is formed on the bottom surface of the lens portion 62.

The upper surface of the lens portion 62 is a portion that becomes a light output surface and has a substantially circular planar shape. A concave portion 624 having a gentle curved surface is formed in a central region near the central axis, A convex portion 625 having a curved surface is formed around the whole 360 degrees around the portion 624. The shape of the upper surface of the lens unit 62 as described above reduces light quantity and brightness in the vicinity of the central axis line and increases the amount of light to the outside, thereby allowing light to be emitted in a uniformly distributed light distribution as a whole. The side surface 626 of the lens portion 62 is formed of a cylindrical surface. Although not shown, a light scattering pattern having a convex-concave structure may be formed on the side surface 626 of the lens portion 62, for example. When the set of the light emitting element 4 and the set of the optical lens 6 are adjacent to the set of the light emitting element 4 and the optical lens 6 on the PCB 2, This relatively small dark area may occur. By applying the light scattering pattern, the above-mentioned dark area can be reduced or eliminated.

Referring again to FIGS. 1 to 4, when the optical lens 6 is mounted on the PCB 2, the four legs 64 are coupled to the upper surface of the PCB 2. The coupling is done in such a way that the tips of each of the legs 64 are glued onto the PCB 2, for example, with an adhesive, or each of the legs 64 is fitted into a hole formed in the PCB 2. At this time, the lens portion 62 of the optical lens 6 is positioned directly on the light emitting element 4. Furthermore, the center of the optical lens 6 and the center of the light emitting element 4 coincide with each other on the optical axis or the central axis.

As described above, one light emitting element 4 and one optical lens 6 constitute one set, and the optical lens 6 is located at an exact corresponding position with respect to the light emitting element 4, Are mounted on the PCB (2) such that the centers are in coincident positions. To this end, the optical lens 6 is attached to the PCB 42 (see Fig. 5) so that each of the four legs 64 of the optical lens 6 is fitted into each of the four fitting grooves 422 of the package body 42 (2). When all of the legs 64 are aligned with all of the four fitting grooves 422 and the outer shape of the package body 42 is aligned with the legs 64 of the optical lens 6, And the center of the optical lens 6 coincide with each other.

6, the legs 64 have a cylindrical shape with a circular outer circumferential surface 642. As shown in FIG. In addition, the fitting groove 422 includes a pair of fitting surfaces 4222 and 4222 perpendicular to each other. A round surface 4223 having a predetermined curvature is formed at a corner where the pair of alignment surfaces 4222 and 4222 intersect. In this embodiment, when the leg portion 64 is fitted into the fitting groove 422, the two fitting surfaces 4222 abut on the outer peripheral surface 642 of the leg portion 64 in a tangential manner. The number of the leg portions 64 and the number of the fitting grooves 422 can be adjusted so long as the plurality of leg portions 64 are aligned with the plurality of fitting grooves 422 to enable accurate positioning between the light emitting element 4 and the optical lens 6. [ , The arrangement and the shape can be variously modified.

Fig. 7 is a view for explaining another embodiment of the present invention. Referring to Fig. 7, a fitting surface 4222 of the fitting groove 422 includes an inclined surface 4222a inclined downward from the top. When the leg portion 64 is fitted into the fitting groove 422, the inclined surface 4222a may be deformed due to an error of the mounter equipment, which may be present in the fitting groove 422 The sloped surface 4222a guides the leg portion 64 into the intended position.

8 is a plan view of a light emitting module according to a preferred embodiment of the present invention. Referring to FIG. 8, a plurality of light emitting devices 4 and a set of optical lenses 6 are arranged on a single PCB 2, May be arranged in an array. The light diffused and emitted from one set of the light emitting element 4 and the optical lens 6 is emitted together with the diffused light of the neighboring light emitting element 4 and the optical lens 6. As mentioned above, the dark region which may occur at the boundary between the adjacent sets of the light emitting element 4 and the optical lens 6 can effectively reduce or eliminate the scattering pattern on the side surface of the optical lens 6. [

Claims (17)

PCB (Printed Circuit Board);
A light emitting device mounted on the PCB; And
And an optical lens including a lens portion, wherein the lens portion is located above the light emitting element,
Wherein the optical lens includes a plurality of legs coupled to the PCB,
Wherein the light emitting element includes a plurality of fitting grooves formed in correspondence with the plurality of leg portions,
Wherein each of the plurality of fitting grooves includes a pair of fitting surfaces, each of the plurality of leg portions is fitted to the fitting groove so as to contact the pair of fitting surfaces,
Wherein the pair of mating surfaces includes an inclined surface.
The light emitting module according to claim 1, wherein each of the plurality of fitting grooves is formed at four corners of a square or a rectangle, and the plurality of leg portions are arranged in a square or rectangular shape corresponding to the plurality of fitting grooves. The leg according to claim 1, wherein each of the legs includes a cylindrical shape having a circular outer circumferential surface, the fitting groove includes a pair of fitting surfaces perpendicular to each other, and the pair of fitting surfaces are formed on an outer peripheral surface of the leg portion Wherein the light emitting module is tangential.
PCB (Printed Circuit Board);
A light emitting device mounted on the PCB; And
And an optical lens including a lens portion, wherein the lens portion is located above the light emitting element,
Wherein the optical lens includes a plurality of legs coupled to the PCB,
Wherein the light emitting element includes a plurality of fitting grooves formed in correspondence with the plurality of leg portions,
A light incidence groove is formed at the center of the bottom surface of the lens portion so as to be positioned directly on the light emitting element, the upper surface of the lens portion is formed with a concave portion having a curved surface in a central region, Wherein a side surface of the lens portion is formed of a cylindrical surface,
And a scattering pattern is formed on a side surface of the lens unit.
The light emitting module according to any one of claims 1 to 4, wherein a plurality of light emitting element-optical lens sets in which the light emitting element and the optical lens are paired are arranged in a predetermined array on the PCB.
The light emitting device according to any one of claims 1 to 4, wherein the light emitting element comprises: a package body; a light emitting diode chip mounted on the package body; a light emitting diode chip supported on the package body, And the first and second terminals are connected to each other.
7. The light emitting module of claim 6, wherein each of the plurality of fitting grooves is formed vertically from the upper surface of the package body at the four corners of the package body to the bottom surface of the package body.
A light emitting device for use in an optical lens having a plurality of leg portions,
A light emitting diode chip; And
And a package body on which the light emitting diode chip is mounted,
Wherein the package body includes a plurality of fitting grooves adapted to each of the plurality of leg portions,
Wherein each of the plurality of fitting grooves includes a pair of fitting surfaces in contact with the leg portions,
And each of the pair of fitting surfaces includes an inclined surface.
The light emitting device according to claim 8, wherein each of the plurality of fitting grooves is formed in each of four corners of the package body.
The light emitting device according to claim 8, wherein the pair of fitting surfaces are perpendicular to each other.
11. The light emitting device according to claim 10, wherein a round surface is formed between the pair of fitting surfaces.
The light emitting device according to any one of claims 8 to 11, wherein the fitting groove is formed vertically from an upper surface of the package body to a bottom surface of the package body.
delete delete delete delete delete

Images