KR102651167B1 - LED lamp for vehicles - Google Patents

Abstract

The LED lamp for a vehicle has a plurality of light-emitting surfaces in which LEDs are arranged in a 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. It includes an optical shield member having a plurality of optical shield units each configured. By disposing an optical shield that limits the circumferential propagation angle of light in the boundary area between a plurality of light-emitting surfaces, the hot spot phenomenon can be reduced and light distribution characteristics can be improved.

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. Considering the light characteristics of LEDs, it is necessary to design the light distribution of LED lamps for vehicles that meet various standards such as ECE standards.

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 to emit light emitted from the LEDs. and an optical shield member having a plurality of optical shield portions each configured to limit a circumferential propagation angle.

The plurality of optical shield units may be arranged at equal intervals along the circumferential direction centered on the longitudinal direction, and neighboring optical shield units among the plurality of optical shield units form a light transmission window provided in the area where the LED is disposed. can do.

The light shield may include a middle portion provided in the middle portion corresponding to the area where the LED is disposed, and a front side portion and a rear side portion disposed respectively in front and rear of the middle portion. The front side portion and the rear side portion may be formed to have a smaller width than the middle portion.

Edges of the front side portion and the rear side portion may be formed to be inclined in a direction parallel to the longitudinal direction.

The edge of the front side portion may be formed to have a larger inclination angle than the edge of the rear side portion.

The light shield member may include a front support portion and a rear support portion spaced apart from each other along the longitudinal direction, and the light shield portion may be respectively connected to the front support portion and the rear support portion in the form of a bridge.

An LED lamp for a vehicle according to another embodiment of the present invention may further include a heat pipe for discharging heat emitted from the LED. The light shield member may have a tubular shape, and the heat pipe may be installed to penetrate the tubular light shield member.

According to the present invention, the hot spot phenomenon can be reduced and light distribution characteristics can be improved by disposing an optical shield that limits the circumferential propagation angle of light in the boundary area between a plurality of light-emitting surfaces.

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 showing the results of simulating the light distribution characteristics of an LED lamp to which no optical shield member is applied in contrast to an embodiment of the present invention.
Figure 9 is a diagram showing the results of simulating the light distribution characteristics of an LED lamp to which a light shield member is applied according to an embodiment of the present invention.
Figures 10 to 12 are diagrams showing comparative results of simulation of circumferential light distribution characteristics when a light shield member is not applied and when a light shield member is applied 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 penetrates, 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.

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 arranged 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, light passing windows 151 corresponding to the area where the LED 11 is disposed are 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.

8 to 12 show simulation results comparing the improvement in light distribution characteristics of an embodiment of the present invention using the light shield member 5 compared to the case where the light shield member is not applied. First, Figure 8 shows the results of simulating the light distribution characteristics of a four-sided light emitting structure in which LEDs are arranged on four sides without applying a light shield member. In FIG. 8, the vertical axis represents the change in angle forward and backward in the X-axis direction in FIG. 1, and the horizontal axis represents the change in angle in the circumferential direction centered on the It is indicated in color. It can be seen that four hot spot areas with high luminance are formed in the area where the LEDs are arranged along the horizontal axis. Meanwhile, referring to FIG. 9, it can be seen that due to the application of the light shield member 5, the hot spot phenomenon is reduced and a much more uniform luminance is maintained depending on the angular position in the circumferential direction, that is, the position along the horizontal axis. .

Meanwhile, Figures 10 to 12 show three angular positions in the The luminous intensity (cd) at each angle is shown. Referring to Figures 10 to 12, it can be seen that when the light shield member is applied, the change in luminance is reduced at each angle position in the circumferential direction. In particular, when the optical shield member is not applied, the maximum light intensity is obtained at 45 degrees, 135 degrees, 225 degrees, and 315 degrees in the circumferential direction when an angle of 90 degrees is formed in the front in the When an angle of 140 degrees is formed in the front direction (Figure 12), the minimum luminance is obtained at 0 degrees in the circumferential direction, and the difference between the maximum and minimum luminance is relatively large. On the other hand, when an optical shield member is applied, the maximum luminous intensity is obtained at 0 degrees in the circumferential direction when an angle of 90 degrees is formed at the front in the (Figure 12), the minimum luminous intensity is obtained at an angle of approximately 350 degrees in the circumferential direction, so the difference between the maximum and minimum luminous intensities is relatively small. From this, it can be seen that the size of the difference between the maximum luminance and the minimum luminance is reduced by applying the light shield member, thereby achieving uniform light distribution characteristics.

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
19: Reflector ring
191: Light reflecting surface
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 (7)

A plurality of light-emitting surfaces on which LEDs are respectively arranged and arranged in the circumferential direction centered on the longitudinal direction, and
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,
The optical shield unit includes a middle portion provided in the middle portion corresponding to the area where the LED is disposed, and a front side portion and a rear side portion disposed respectively in front and rear of the middle portion,
The front side portion and the rear side portion are formed to have a smaller width than the middle portion,
Edges of the front side portion and the rear side portion are formed to be inclined in a direction parallel to the longitudinal direction,
An LED lamp for a vehicle in which an edge of the front side portion is formed to have a larger inclination angle than an edge of the rear side portion. In paragraph 1:
The plurality of optical shield units are arranged at equal intervals along the circumferential direction centered on the longitudinal direction,
Among the plurality of optical shield units, neighboring optical shield units form a light transmission window provided in the area where the LED is disposed.
LED lamps for vehicles. delete delete delete In paragraph 1:
The optical shield member includes a front support part and a rear support part arranged to be spaced apart along the longitudinal direction,
The optical shield unit is connected to the front support part and the rear support part in a bridge shape, respectively.
LED lamps for vehicles. In paragraph 1:
Further comprising a heat pipe for dissipating heat emitted from the LED,
The light shield member has a tubular shape,
The heat pipe is installed to penetrate the tubular light shield member.
LED lamps for vehicles.

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