KR102651168B1 - LED lamp for vehicles - Google Patents

Abstract

An LED lamp for a vehicle includes a plurality of light-emitting surfaces, each of which has LEDs arranged in the circumferential direction centered on the longitudinal direction, and is disposed in a boundary area between the plurality of light-emitting surfaces to limit the circumferential travel angle of the light emitted from the LEDs. An optical shield member having a plurality of optical shield units, an end cap configured to block light emitted from the LED from proceeding directly forward, and an end cap configured to reflect some of the light emitted from the LED forward. It includes a reflector ring configured.

Description

LED lamp for vehicles

The present invention relates to LED lamps for vehicles.

LED lamps for vehicles using LEDs are being used to replace existing halogen lamps for vehicles. LED lamps for vehicles need to meet standards such as the UN's ECE (Economic Commission for Europe) standards (UN Regulations No. 37). However, for example, multi-faceted LED lamps with LEDs arranged on four sides do not meet these ECE light distribution standards.

In particular, unlike existing halogen lamps, when applying LEDs, there is a problem of hot spots with too high illuminus intensity due to non-uniform light distribution and light overlap due to the diffusion angle of the LED. Additionally, there is a problem that the luminous intensity decreases due to light deviation in a specific angle area.

Republic of Korea registered patent 10-1577999 (2015.12.10.) Republic of Korea Public Patent No. 10-2020-0091754 (2020.07.31.)

The problem to be solved by the present invention is to provide a vehicle LED lamp with improved light distribution characteristics.

An LED lamp for a vehicle according to an embodiment of the present invention has a plurality of light-emitting surfaces in which LEDs are each disposed and arranged in the circumferential direction centered on the longitudinal direction, and is disposed in a boundary area between the plurality of light-emitting surfaces, so that the circumference of the light emitted from the LEDs is An optical shield member having a plurality of optical shield units each configured to limit the directional propagation angle, an end cap configured to block light emitted from the LED from proceeding directly forward, and a portion of the light emitted from the LED It includes a reflector ring configured to reflect forward. The end cap is disposed in front of the light shield portion and includes a first light reflecting surface configured to reflect light backward, and the reflector ring is disposed behind the light shield portion and is configured to reflect light forward. It includes a second light reflecting surface configured to. The first light reflecting surface includes a front depression that is depressed forward, and the second light reflecting surface includes a rear depression that is depressed backward. The front depression and the rear depression are each formed at circumferential positions corresponding to the light shield portion. The front recessed portion is formed to be inclined toward the outside of the end cap at the front end of the light shield portion, and the rear recessed portion is formed to be inclined toward the outside of the reflector ring at the rear end of the light shield portion. The angle formed between the line perpendicular to the longitudinal direction of the light emitting surface and the first light reflecting surface is smaller than the angle formed between the line perpendicular to the longitudinal direction of the light emitting surface and the second light reflecting surface.

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The angle formed by the line perpendicular to the longitudinal direction of the light-emitting surface and the first light reflecting surface may be in the range of 3 degrees ± 10 degrees, and the line perpendicular to the longitudinal direction of the light-emitting surface and the second light reflecting surface may be The angle formed can range between 14 degrees ± 10 degrees.

According to the present invention, not only can the hot spot phenomenon be reduced by the optical shield unit, but also the problem of reduced luminous intensity due to insufficient LED diffusion angle can be solved through light reflection by the light reflecting surface of the end cap and reflector ring. The side effect of reduced brightness that may be caused by the shield part can be reduced.

Figure 1 is a perspective view of an LED lamp for a vehicle according to an embodiment of the present invention.
Figure 2 is a rear perspective view of an LED lamp for a vehicle according to an embodiment of the present invention.
Figure 3 is a side view of an LED lamp for a vehicle according to an embodiment of the present invention.
Figure 4 is a cross-sectional view taken along line IV-IV of Figure 1 of an LED lamp for a vehicle according to an embodiment of the present invention.
Figure 5 is a cross-sectional view taken along line V-V of Figure 1 of an LED lamp for a vehicle according to an embodiment of the present invention.
Figure 6 is a perspective cross-sectional view taken along line V-V of Figure 1 of an LED lamp for a vehicle according to an embodiment of the present invention.
Figure 7 is a diagram showing a light shield member of an LED lamp for a vehicle according to an embodiment of the present invention and an LED arranged to pass through it.
Figure 8 is a diagram for explaining the light incidence and reflection angles of the end cap and reflector ring of the LED lamp for a vehicle according to an embodiment of the present invention.

Below, with reference to the attached drawings, embodiments of the present invention will be described in detail so that those skilled in the art can easily implement the present invention. However, the present invention may be implemented in many different forms and is not limited to the described embodiments.

Referring to Figures 1 and 2, a plurality of LEDs 11 are arranged to form a multi-faceted light emission structure. For example, in Figures 1 and 2, the LEDs 11 are arranged on four surfaces arranged at 90-degree intervals along the circumferential direction around the X-axis, that is, the longitudinal axis of the LED lamp, to form four light-emitting surfaces. It can be. The drawing shows an example in which one LED 11 is installed on each side, but multiple LEDs may be installed on each side. Referring to FIGS. 4 to 6, a heat pipe 13 having an approximately square cross-sectional profile is supported on a heat sink 27, and the substrate 12 on which the LED 11 is fixed is located on the four sides of the heat pipe 13. Each can be placed on the outer peripheral surface of the dog. One end of the heat pipe 13 is exposed to the space where the heat dissipation fan 29 of the heat sink 27 is installed, and the heat generated from the LED 11 by the air flow caused by the operation of the heat dissipation fan 29 is transmitted through the heat pipe. It can be discharged through (13).

The focus ring 21 is fixed to the heat sink 27, and the focus ring 21 may be fastened to a lamp housing (not shown) of the vehicle through a fastening protrusion 23 provided on the outer peripheral surface. The focus ring 21 may have a ring shape through which the heat pipe 13 passes, and three fastening protrusions 23 may be arranged along the circumferential direction on the outer peripheral surface of the focus ring 21. Meanwhile, a sealing ring 25 for sealing between the focus ring 21 and the lamp housing may be provided on the outer peripheral surface of the focus ring 21.

An end cap 17 and a reflector ring 19 may be disposed on both sides of the LED 11, respectively. As shown in FIGS. 1 to 4, the end cap 17 and the reflector ring 19 may be disposed on both sides of the area where the LED 11 is arranged along the X-axis direction, that is, the longitudinal direction, and the end cap 17 A cap 17 may be placed at the tip. The end cap 17 has a light reflection surface 171 configured to block the light emitted from the LED 11 from proceeding directly to the front and to reflect the light emitted from the LED 11 backward. The reflector ring 19 is formed in a ring shape to reflect light emitted from the LED 11 radially outward and forward. For this purpose, the end cap 17 may be provided with a ring-shaped light reflection surface 171 provided on the rear side where the LED 11 is disposed, that is, on the side facing the right direction in FIG. 4, and a reflector ring 19 ) may be provided with a ring-shaped light reflection surface 191 provided in front of the LED 11, that is, on the side facing the left direction in FIG. 4. The light reflecting surface 191 of the reflector ring 19 is configured to reflect the light emitted from the LED 11 forward.

Referring to FIG. 3, the light reflecting surface 171 of the end cap 17 includes a front depression 172 that is depressed forward, and the front depression 172 has a circumference corresponding to the light shield portion 15. It is formed in a directional position. Similarly, the light reflecting surface 191 of the reflector ring 19 includes a rear depression 192 that is depressed backwards, and the rear depression 192 is located at a circumferential position corresponding to the light shield portion 15. is formed The front and rear depressions 172 and 192 formed adjacent to the front and rear ends of the light shield portion 15 allow the light reflected by the light reflection surfaces 171 and 181 to pass through the front portion (50 degrees from the front to the rear). It can prevent the hot spot phenomenon in specific parts (45 degrees, 135 degrees, 225 degrees, and 315 degrees) in the circumferential direction from the rear part (150 degrees from front to back). Additionally, the front depression 172 secures the front path of light and can prevent a decrease in light intensity.

A light shield member 5 is provided to limit the propagation angle in the circumferential direction of light emitted from the LEDs 11 disposed on a plurality of surfaces. The light shield member 5 is disposed between each surface on which the LED 11 is disposed and is configured to block light from traveling beyond a certain angle range in the circumferential direction, thereby limiting the propagation angle of light in the circumferential direction. Referring to luminous intensity 4, the light shield member 5 may have a tube shape through which the heat pipe 13 can pass, and is disposed between adjacent surfaces on which the LEDs 11 are disposed, in the longitudinal direction, That is, it may be provided with an optical shield portion 15 extending in a direction parallel to the front-to-back direction. For example, as shown in FIG. 5, when the LED 11 is disposed on each of the four sides to form a four-sided light dissipation structure, the four light shield parts 15 are adjacent to the LED 11. It is disposed in an area corresponding to the vertex where the light-emitting surfaces meet, and at this time, a light passing window 151 corresponding to the area where the LED 11 is disposed is provided between the light shield parts 15, respectively. At this time, the light shield unit 15 may be arranged to be located radially outward from the LED 11. Four light passing windows 151 may be arranged at intervals of 90 degrees in the circumferential direction corresponding to the area where the four LEDs 11 are disposed.

Referring to FIG. 5, the lines (L1, L2) connecting the center of the upper surface of the LED 11 to the outer tops of the light shield portion 15 disposed on both sides of the LED 11 are the surfaces of the LED 11. It may be configured to form a predetermined angle (C) with the normal line (L3). At this time, the predetermined angle C may be an angle of 48 degrees ± 10 degrees. As a result, it is possible to secure uniform light distribution characteristics while reducing the hot spot phenomenon.

Referring to FIG. 7, the light shield member 5 may include a front support portion 152 and a rear support portion 153 that are disposed to face each other and be spaced apart in the front-back direction, that is, in the X-axis direction in FIG. 4, and each light The shield portion 15 may be formed in the form of a bridge connecting the front support portion 152 and the rear support portion 153. Meanwhile, the end cap 17 may be fastened to the front support 152 and the reflector ring 19 and focus ring 21 may be fastened to the rear support 153.

The light shield portion 15 is provided in the center portion corresponding to the LED 11 and has a relatively large width, that is, a length in the circumferential direction, at the center 155, and is disposed on both sides of the center 155 and has a relatively small width. It may be provided with a front side portion 156 and a rear side portion 157 having a width. The front and rear side portions 156 and 157 may be formed to have inclined edges so that the width gradually decreases as the distance from the LED 11 increases. The presence of the front side 156 and the rear side 157 means an increase in the size of the light transmission window 151 in these areas, which is 50 degrees in front of the X-axis due to the presence of the light shield 15. and to offset excessive reduction in luminous intensity in the region of 140 degrees. At this time, as shown in FIG. 7, the inclination angle (angle relative to the direction parallel to the X-axis direction) (A) of the edge of the front side portion 156 is the inclination angle (B) of the edge of the rear side portion 157 It can be formed to be larger. For example, the inclination angle A of the edge of the front side portion 156 may be 65 degrees ± 10 degrees, and the inclination angle B of the edge of the rear side portion 157 may be 40 degrees ± 10 degrees. Through the optical shield portion 15 of this shape, the light emitted from the LED 11 overlaps in the circumferential direction to prevent the formation of hot spots with excessively high luminous intensity, while securing the desired light distribution characteristics.

Referring to FIG. 8, the angle between the line V1 perpendicular to the longitudinal direction (lateral direction in FIG. 8) of the light emitting surface on which the LED 11 is disposed and the extension line L5 of the first light reflecting surface 171 ( IA1) may be smaller than the angle IA2 between the line V2 perpendicular to the longitudinal direction of the light emitting surface and the extension line L6 of the second light reflecting surface 191. As a specific example, the angle IA1 formed between the line V1 perpendicular to the light emitting surface and the extension line L5 of the first light reflecting surface 171 may be an angle in the range of 3 degrees ± 10 degrees, and the light emitting surface The angle IA2 formed by the line V2 perpendicular to and the extension line L6 of the second light reflecting surface 191 may be an angle ranging from 14 degrees ± 10 degrees. The combination of these angles can reduce the reduction in light intensity caused by the presence of the light shield portion 15.

Although the embodiments of the present invention have been described above, the scope of the present invention is not limited thereto, and various modifications and improvements made by those skilled in the art using the basic concept of the present invention defined in the following claims are also included in the scope of the present invention. It belongs.

11: LED
12: substrate
13: heat pipe
27: heat sink
29: Heat dissipation fan
21: focus ring
17: End cap
171: Light reflecting surface
172: Front depression
19: Reflector ring
191: Light reflecting surface
192: Rear depression
5: Absence of optical shield
15: Optical shield part
151: light transmitting window
152: front support
153: rear support
155: center
156: Front side part
157: rear side part

Claims (6)

A plurality of light-emitting surfaces where LEDs are each arranged and arranged in a circumferential direction centered on the longitudinal direction,
A light shield member disposed in a boundary area between the plurality of light-emitting surfaces and having a plurality of light shield units each configured to limit a circumferential propagation angle of light emitted from the LED;
An end cap configured to block the light emitted from the LED from proceeding directly forward, and
It includes a reflector ring configured to reflect some of the light emitted from the LED forward,
The end cap is disposed in front of the light shield unit and includes a first light reflecting surface configured to reflect light backward,
The reflector ring is disposed behind the light shield unit and includes a second light reflection surface configured to reflect light forward,
The first light reflecting surface includes a front depression that is depressed forward,
The second light reflecting surface includes a rear depression that is depressed backward,
The front depression and the rear depression are each formed at circumferential positions corresponding to the optical shield portion,
The front recessed portion is formed to be inclined outwardly of the end cap at the front end of the optical shield portion, and the rear recessed portion is formed to be inclined outwardly of the reflector ring at the rear end of the optical shield portion,
An LED lamp for a vehicle in which the angle formed between a line perpendicular to the longitudinal direction of the light-emitting surface and the first light reflecting surface is smaller than the angle formed between the line perpendicular to the longitudinal direction of the light-emitting surface and the second light reflecting surface. delete delete delete delete In paragraph 1:
The angle formed by the line perpendicular to the longitudinal direction of the light-emitting surface and the first light reflecting surface is in the range of 3 degrees ± 10 degrees, and the angle formed by the line perpendicular to the longitudinal direction of the light-emitting surface and the second light reflecting surface is Automotive LED lamp within the range of 14 degrees ± 10 degrees.

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