KR101236737B1 - Aspherical lens for a light emitting diode and light source assembly including the same - Google Patents

Abstract

PURPOSE: An aspherical lens for an LED and a light source assembly including the same are provided to control light distribution by refraction of light by lens and hence, concentrate light in a desired part on the ground, thereby increasing luminance efficiency of a lamp. CONSTITUTION: An aspherical lens(100) refracts light output from an LED. The LED is installed in the center of an arrangement plane(150) or an adjacent region. The aspherical lens includes an incident plane, an exit plane(110) and a single hump unit(130). The incident plane is defined by a shape of a groove accommodating the LED. The exit plane outputs light input from the incident plane. The single hump unit connects the exit plane and the bottom surface. [Reference numerals] (AA) Second direction; (BB) First direction

Description

Aspheric lens for LEDs and light source assembly including the same {ASPHERICAL LENS FOR A LIGHT EMITTING DIODE AND LIGHT SOURCE ASSEMBLY INCLUDING THE SAME}

The present invention relates to an aspherical lens, and more particularly to an aspherical lens for LEDs and a light source assembly including the same.

In general, lamps are classified into street lamps, tunnel lamps, pedestrian crossing lamps, security lamps, and the like depending on where they are installed. The lamp is installed to have an appropriate light distribution according to the lighting use in each place. For example, street lights provided in the center lane of the road are installed so that the light emitted from the light source such as the illumination is diffused downward so as to illuminate all road surfaces of both lanes with a certain level or more of brightness. In addition, streetlights installed near the road where the driveway and the sidewalks face light only on one side by the external reflector so that the light emitted from the light source is less directed toward the sidewalk so as to shine light on the roadway and relatively dark on the sidewalk. It is installed to be distributed downward.

On the other hand, in terms of space, the road has a characteristic of extending in one direction. However, in the case of using a lamp installed in the center of the road to illuminate the road surface, a lamp that simply distributes the light distribution of the light emitted from the light source as in the prior art (Korea Patent Registration 10-0806598 (2008.02.18 published), Republic of Korea Patent Publication Publication 10-2011-0064771 (published on June 15, 2011), etc., does not reflect the spatial characteristics of such a road, and thus there is a problem in that light cannot be concentrated to a desired portion of the ground. In addition, in the case where a reflecting plate is separately provided to the outside to focus the light to a desired part of the ground, the light emitted first from the light source is partially lost while passing through the lens covering the light source, and the other part is reflected by the reflecting plate. By further loss, the light efficiency of the lamp is lowered. In particular, when a metal halide lamp having low light efficiency, which is commonly used for road lighting, is installed in the center of a road, it is more difficult to efficiently concentrate light on both road surfaces of the road.

On the other hand, in recent years, attempts have been made to implement a lamp using a light-emitting diode (LED), which has low power and excellent brightness. However, there is a limitation in which a lens for an LED suitable for a lamp using a light emitting diode is not disclosed.

Accordingly, the technical problem of the present invention has been conceived in this respect, and an object of the present invention is to provide an aspherical lens for an LED capable of realizing a light distribution distribution suitable for illuminating a linear space.

Another object of the present invention is to provide a light source assembly including the aspherical lens for the LED.

Aspheric lens for LED according to an embodiment for realizing the object of the present invention, the aspherical lens for LED that has a groove for accommodating the LED, and refracting the light emitted from the LED, the light from the LED Is incident, the light incident surface defined according to the shape of the groove; And a light exit surface through which light incident through the light incident surface exits, wherein a width in a first direction of the lens is smaller than a width in a second direction perpendicular to a plane with the first direction. The width in the first direction is greater than the width in the second direction.

In one embodiment of the present invention, the light exit surface is the first direction or the second direction with respect to the center of the light exit surface defined as the point of the shortest light path that the light emitted from the center of the lens reaches the light exit surface It may have a symmetrical shape along the direction.

In one embodiment of the present invention, in the light exit surface, a first area including a light exit surface center defined as a point of the shortest light path through which light emitted from the center of the lens reaches the light exit surface is the first area. The curvature may be smaller than the second area surrounding the space.

In one embodiment of the present invention, in the light exit surface, the first area including the light exit surface center defined as the point of the shortest light path through which light emitted from the center of the lens reaches the light exit surface has a flat shape, The second region surrounding the first region may have a round shape to have a predetermined curvature.

According to one or more exemplary embodiments, a light source assembly includes: a support member; A light source unit disposed on an upper surface of the support member and including a light source; An aspherical lens having a groove for accommodating the light source and disposed on the light source unit; And a lid member coupled to the support member to fix the aspherical lens to the support member, wherein the aspherical lens comprises: a light incident surface on which light is incident from the light source and defined according to the shape of the groove; A light exit surface through which light incident through the light incident surface exits; A bottom surface in contact with the light source unit; And a step portion connecting the bottom surface and the light exit surface and contacting the cover member, wherein a width in a first direction of the aspherical lens is smaller than a width in a second direction perpendicular to the first direction in a plane. The width in the first direction of the groove is larger than the width in the second direction.

In an embodiment of the invention, the light source may comprise a light emitting diode.

In one embodiment of the present invention, the upper surface of the support member may include a groove for receiving the waterproof member between the cover member and the coupling.

According to such an aspherical lens for LEDs and a light source assembly including the same, a light distribution in one direction is perpendicular to the one direction in order to illuminate a linear illumination space such as a road without having a separate reflector on the outside. The light distribution may be adjusted to be wider than the light distribution in one direction. In addition, by adjusting the distribution of the light distribution only by the refraction of the light by the lens, it is possible to implement a lamp having a high light efficiency and illuminance by concentrating the light on the desired portion of the ground.

1 is a perspective view of an aspherical lens for LEDs according to an embodiment of the present invention.
FIG. 2 is a bottom perspective view of the aspherical lens for LED of FIG. 1. FIG.
3A is a cross-sectional view taken along the line II ′ of the aspherical lens of FIG. 1.
3B is a cross-sectional view taken along the line II-II ′ of the aspherical lens of FIG. 1.
FIG. 4A is a plan view of light distribution distributed by the aspherical lens for LED of FIG. 1. FIG.
4B is a cross-sectional view of a light distribution distribution implemented by the aspherical lens for LED of FIG. 1.
5 is a perspective view of a light source assembly according to an embodiment of the present invention.
6 is an exploded perspective view of a light source assembly according to an embodiment of the present invention.
7 is a perspective view of a virtual light distribution distribution implemented when a lamp including a light source assembly according to an embodiment of the present invention is disposed along a central row of roads.

Hereinafter, with reference to the drawings will be described in detail preferred embodiments of the light source device of the present invention.

The present invention is capable of various modifications and various forms, and specific embodiments are illustrated in the drawings and described in detail in the text. It should be understood, however, that the invention is not intended to be limited to the particular forms disclosed, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. Like reference numerals are used for like elements in describing each drawing. In the accompanying drawings, the dimensions of the structures are enlarged from the actual size in order to clarify the present invention. The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component. Singular expressions include plural expressions unless the context clearly indicates otherwise.

In this application, the terms "comprise" or "have" are intended to indicate that there is a feature, number, step, action, component, part, or combination thereof described on the specification, and one or more other features. It is to be understood that the present invention does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, parts, or combinations thereof. In addition, unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.

1 is a perspective view of an aspherical lens for LEDs according to an embodiment of the present invention. FIG. 2 is a bottom perspective view of the aspherical lens for LED of FIG. 1. FIG.

1 and 2, the aspherical lens 100 according to the present exemplary embodiment has a groove 160 for accommodating the LED and refracts the light emitted from the LED. The aspheric lens 100 has light incident from the LED and a light incident surface 120 defined according to the shape of the groove 160, and a light exit surface from which light incident through the light incident surface 120 is emitted to the outside. 110 may be included. The width in the first direction of the aspherical lens 100 is smaller than the width in the second direction perpendicular to the first direction and the width in the first direction of the groove 160 is in the second direction. It can be greater than the width of. The light incident surface 120 and the light emitting surface 110 will be described in more detail with reference to FIGS. 3A and 3B.

Aspheric lens 100 may accommodate the LED to refracted the light emitted from the LED. The aspherical lens 100 may be made of a transparent material such as glass, plastic, or the like, which may transmit light.

The placement surface 150 is a virtual surface on which the aspherical lens 100 is disposed, and the LED is disposed in a portion of the placement surface 150, and the aspherical lens 100 may be arranged to receive the LED. have. For example, the LED may be disposed at the center OP or an adjacent area of the placement surface 150. For example, the LED may be disposed on the placement surface 150 within a boundary E where the incident surface 120 of the aspherical lens 100 and the placement surface 150 meet. Hereinafter, the center OP of the placement surface 150 is referred to as the center of the lens.

The aspherical lens 100 according to the present exemplary embodiment may further include a bottom surface 140 and a stepped portion 130. The bottom surface 140 contacts the placement surface 150 of the aspherical lens 100 and may have a ring shape. The stepped portion 130 is a portion in contact with the cover member (220 of FIG. 6) to be described later, and may connect the light exit surface 110 and the bottom surface 140.

3A is a cross-sectional view taken along the line II ′ of the aspherical lens of FIG. 1. 3B is a cross-sectional view taken along the line II-II ′ of the aspherical lens of FIG. 1.

Referring to FIGS. 3A and 3B, the light incident surface 120 is a surface on which light is incident from an LED disposed on the layout surface 150, and protrudes convexly in a vertical direction from the layout surface 150. The light incident surface 120 is defined according to the shape of the groove 160. Hereinafter, the point of the light incident surface 120 farthest away from the placement surface 150 in the vertical direction is referred to as the light incident surface center BP.

As shown in FIGS. 3A and 3B, the width of the groove 160 in the first direction is greater than the width of the second direction perpendicular to the first direction. That is, the length of the first curve 121 formed by the cross section cut perpendicularly to the placement surface 150 in the first direction on the placement surface 150 to include the light incident surface center BP is the light incident surface center. Longer than the length of the second curve 122 formed by a cross section perpendicular to the placement surface 150 along the second direction on the placement surface 150 that is perpendicular to the first direction to include (BP). Longer. The first curve 121 and the second curve 122 may each have a symmetrical shape with respect to the light incident surface center BP.

The light exit surface 110 is a surface through which light incident through the light incident surface 120 is emitted to the outside, and has a shape protruding convexly from the placement surface 150 in the vertical direction, like the light incident surface 120. In the light exit surface 110 when the deflection by the light incident surface 120 is ignored, that is, when it is assumed that light directly reaches the light exit surface 110 from the LED disposed on the placement surface 150, the center of the lens OP There is a point in the shortest optical path through which the light emitted from the light reaches the light exit surface 110, which is hereinafter referred to as the light exit surface center AP.

As shown in FIGS. 3A and 3B, the width of the aspherical lens 100 in the first direction is smaller than the width of the second direction perpendicular to the first direction. That is, the length of the third curve 111 formed by the cross section cut perpendicularly to the placement surface 150 along the first direction to include the light exit surface center AP includes the light exit surface center AP. It is shorter than the length of the fourth curve 112 is formed by the cross section cut perpendicular to the placement surface 150 along the second direction. In some embodiments, the light exit surface 110 may have a symmetrical shape along the first direction or the second direction based on the center of the light exit surface AP. That is, the third curve 111 and the fourth curve 112 may be symmetrical with respect to the light emitting surface center AP, respectively.

In the aspherical lens 100 according to an exemplary embodiment of the present invention, in the light exiting surface 110, the first region including the center of the light exiting surface is smaller in curvature than the second area surrounding the first area. Can be. That is, referring to FIGS. 3A and 3B, the curves formed by a cross section including the light exit surface center AP and perpendicular to the placement surface 150 may have a radius of curvature at the light exit surface center AP. It may be greater than or equal to the radius of curvature at other points on the curves. At this time, the radius of curvature has a value of 0 or more, and theoretically, the radius of curvature for a point on a plane has an infinite value. In addition, in the light exit surface 110 of the aspherical lens 100 according to an embodiment of the present invention, the first area including the light exit surface center AP has a flat shape and surrounds the first area. The region may have a round shape to have a predetermined curvature.

Referring back to FIG. 1, according to an embodiment, the light exit surface 110 may include at least four elliptic surfaces EL1, EL2, EL3, and EL4. Referring to FIG. 1, curved surfaces of the light emitting surface 110 formed diagonally with respect to the first and second directions with respect to the light emitting surface center AP may include at least four elliptical surfaces EL1 and EL2. , EL3 and EL4). According to an embodiment, for the four ellipsoids EL1, EL2, EL3, EL4, the distance from any point on the ellipsoids EL1, EL2, EL3, EL4 to the two focal points for that ellipsoid The sum may be substantially the same.

As described above, the aspherical lens 100 according to the embodiment of the present invention has a width in a first direction smaller than a width in a second direction perpendicular to the first direction and a plane, and the first direction of the groove 160. The width of is larger than the width of the second direction. When the LED is disposed adjacent to the center OP of the lens, the light distribution of the light refracted through the aspherical lens 100 as described above is emitted so that the light distribution length with respect to the second direction is different with respect to the first direction. It is formed longer than the light distribution length. Light distribution through the aspherical lens 100 will be described in more detail with reference to FIGS. 4A and 4B.

FIG. 4A is a plan view of light distribution distributed by the aspherical lens for LED of FIG. 1. FIG. 4B is a cross-sectional view of a light distribution distribution implemented by the aspherical lens for LED of FIG. 1.

Referring to FIG. 4A, when light is emitted from the LED to the outside through the aspherical lens 100 for LEDs according to an embodiment of the present invention, the light distribution is greater than the length reflected in the first direction (vertical axis). The length projected in two directions (horizontal axis) is formed longer. In addition, the area in which light is concentrated in the light distribution may appear symmetrically up, down, and / or left and right with respect to the center of the lens OP, that is, (0,0). Therefore, when illuminating with a LED a linear space extending in one direction (that is, the horizontal axis) such as a road and shortly extending in another direction (that is, the vertical axis) perpendicular to the one direction, By refracting the light of the LED through the same aspherical lens 100, it is possible to implement a light distribution distribution suitable for illuminating the linear space without having a separate reflector. In addition, the light efficiency can be increased by eliminating the possibility of light being lost by the reflecting plate.

In FIG. 4B, an aspherical surface for LEDs according to an exemplary embodiment of the present invention is based on a point at which intensity is 50% or more in a cross section of the light distribution of light emitted from the LED along the first direction (vertical axis). The case where light is emitted through the lens 100 (solid line) and the case where light is emitted through a conventional lens (dotted line) are respectively shown. Referring to FIG. 4B, when the light is emitted through the aspherical lens 100 for LEDs according to an embodiment of the present invention (solid line), the light is emitted through the conventional lens (dashed line). It can be seen that it is illuminated at a narrower angle with respect to the direction. Therefore, when implementing the lamp using the aspherical lens 100 for the LED, it is possible to illuminate so that the light is more concentrated on the road surface of the road, not the outside of the road for the road extending in the second direction.

5 is a perspective view of a light source assembly according to an embodiment of the present invention. 6 is an exploded perspective view of a light source assembly according to an embodiment of the present invention.

5 and 6, the light source assembly 200 according to an embodiment of the present invention includes a storage container 230, a light source unit 240 disposed in the storage container 230, and the light source unit 240. It includes an aspherical lens 100 disposed on). In some embodiments, an elastic member (not shown) is further included between the light source unit 240 and the aspherical lens 100, and the aspherical lens 100 is firmly disposed on the light source unit 240. Pressure applied to the aspherical lens 100 from the outside can be buffered.

The light source unit 240 includes a printed circuit board and a light source 241 that emits light to the aspheric lens 100. The printed circuit board may be electrically connected to a connector for supplying power to the light source 241 from an external power supply source. The light source 241 may include a light emitting diode (LED).

The storage container 230 includes a support member 210 and a cover member 220 coupled to the support member 210. The light source unit 240 and the aspherical lens 100 are accommodated between the support member 210 and the cover member 220. That is, the light source unit 240 and the aspherical lens 100 are disposed on the upper surface 211 of the support member 210.

According to an embodiment, a groove 213 for accommodating a waterproof member (not shown) is coupled to the lid member 220 in an area adjacent to an edge of the upper surface 211 of the support member 210. May be included. The waterproof member is formed of a material such as silicone resin, which seals coupling portions of the components of the light source assembly 200 to prevent foreign substances such as water or dust from entering the light source assembly 200. Can be.

The support member 210 may include a screw coupling part 215 to be fixed to a support member (not shown) for supporting the light source assembly 200. The screw coupling portion 215 may protrude to the outer surface of the support member 210 and have a screw coupling hole 216 penetrating in the vertical direction.

The lid member 220 is coupled to the supporting member 210 as the protrusion 223 of the locking member 221 is caught by the locking portion 217 of the supporting member 210. The flange portion 225 of the cover member 220 firmly fixes the aspherical lens 100 and the light source unit 240. The inner surface of the cover member 220 may be in contact with the stepped portion 130 of the aspherical lens 100, thereby firmly fixing the aspherical lens 100 to the support member 210.

The aspherical lens 100 has a light incident surface 120 in which light is incident from a light source and is defined according to a shape of a groove, a light emitting surface 110 through which light incident through the light incident surface is emitted to the outside, and adjacent to the light source unit. The bottom surface 140 may include a stepped portion 130 connecting the bottom surface and the light exit surface and contacting the cover member.

The aspherical lens 100 has a width in a first direction smaller than a width in a second direction perpendicular to the first direction, and the groove 160 has a width in the first direction, in the second direction. Is greater than the width.

The light incident surface 120 is perpendicular to the top surface 211 of the support member 210 along a first direction on the top surface 211 of the support member 210 to include the light incident surface center BP. The length of the first curve 121 formed by the cut section is a second direction on the upper surface 211 of the support member 210 perpendicular to the first direction to include the light incident surface center BP. Accordingly, it is longer than the length of the second curve 122 formed by the cross section cut perpendicularly to the upper surface 211 of the backing member 210. The first curve 121 and the second curve 122 may each have a symmetrical shape with respect to the center of the light incident surface BP.

The light exit surface 110 is a third curve 111 formed by a cross section perpendicular to the upper surface 211 of the support member 210 along the first direction to include the light exit surface center AP. Is longer than the length of the fourth curve 112 formed by a cross section cut perpendicularly to the upper surface 211 of the support member 210 along the second direction to include the light exit surface center AP. Shorter

The bottom surface 140 may be adjacent to the light source unit 240 and disposed on the top surface 211 of the support member 210. The stepped portion 130 may connect the bottom surface 140 and the light exit surface 110 to be in contact with the cover member 220.

7 is a perspective view of a virtual light distribution distribution implemented when a lamp including a light source assembly according to an embodiment of the present invention is disposed along a central column of a road.

Referring to FIG. 7, when lighting lamps including the light source assembly 200 according to an exemplary embodiment of the present invention are disposed at predetermined intervals along a central column of the road, the light distribution is wide in a direction in which the road extends. In the direction perpendicular to the road, light may be concentrated and irradiated to the illumination region R1 having a relatively light distribution. In addition, as the lamps are arranged at predetermined intervals, light may be irradiated with high brightness even in a region S1 overlapping the adjacent illumination region R2. In addition, light may be irradiated to road outer areas W1 and W2 located near the road so that brightness is darker than that on the road surface of the road.

As described above, according to the embodiments of the present invention, in order to illuminate a linear illumination space such as a road without having a separate reflector on the outside, the light distribution in one direction is perpendicular to the one direction. The light distribution may be adjusted to be wider than the light distribution in the other direction. In addition, by adjusting the distribution of the light distribution only by the refraction of the light by the lens, it is possible to implement a lamp having a high light efficiency and illuminance by concentrating the light on the desired portion of the ground.

Although described above with reference to preferred embodiments of the present invention, those skilled in the art or those skilled in the art without departing from the spirit and scope of the invention described in the claims to be described later It will be understood that various modifications and variations can be made within the scope of the invention.

100: aspherical lens 110: light exit surface
120: light incident surface 130: stepped portion
140: bottom 150: placement surface
160: groove of the lens
200: light source assembly 210: support member
220: cover member 230: storage container
240: light source unit

Claims (7)

An aspherical lens for an LED having a groove for accommodating an LED and refracting light emitted from the LED,
A light incident surface to which light is incident from the LED and is defined according to the shape of the groove; And
It includes a light emitting surface for the light incident through the light incident surface is emitted to the outside,
The width of the first direction of the lens is smaller than the width of the second direction perpendicular to the plane and the first direction,
An aspherical lens for LEDs having a width in the first direction of the groove greater than a width in the second direction. The method of claim 1,
The light exit surface has a symmetrical shape along the first direction or the second direction with respect to the center of the light exit surface defined as the point of the shortest light path through which light emitted from the center of the lens reaches the light exit surface. Aspheric lens for LED, characterized in that. The method of claim 1,
In the light exiting surface, a first area including a light exiting surface center defined as a point of the shortest light path through which light emitted from the center of the lens reaches the light exiting surface is, than a second area surrounding the first area. Aspheric lens for LED, characterized by low curvature. The method of claim 1,
In the light exiting surface, a first area including a light exiting surface center defined as a point of the shortest light path through which light emitted from the center of the lens reaches the light exiting surface has a flat shape and surrounds the first area. An aspherical lens for LEDs, characterized in that the second region has a round shape to have a predetermined curvature. Support member;
A light source unit disposed on an upper surface of the support member and including a light source;
An aspherical lens having a groove for accommodating the light source and disposed on the light source unit; And
A lid member coupled to the support member to fix the aspherical lens to the support member;
The aspherical lens,
A light incident surface to which light is incident from the light source and defined according to the shape of the groove;
A light exit surface through which light incident through the light incident surface exits;
A bottom surface adjacent to the light source unit; And
A stepped portion connecting the bottom surface and the light exit surface and contacting the cover member;
The width of the first direction of the aspherical lens is smaller than the width of the second direction perpendicular to the first direction and the plane,
The width of the groove in the first direction is greater than the width of the second direction. The method of claim 5,
And the light source comprises a light emitting diode. The method of claim 5,
The upper surface of the support member, the light source assembly, characterized in that it comprises a groove for accommodating the waterproof member while being coupled with the cover member.

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