KR20230052645A - LED lamp for vehicles - Google Patents

Abstract

The present invention relates to a vehicle LED lamp, which includes: a plurality of light-emitting surfaces in which 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 LEDs; an end cap configured to block the light emitted from the LEDs from proceeding directly forward; and a reflector ring configured to reflect some of the light emitted from the LEDs forward. Therefore, it is possible to reduce side effects of light attenuation caused by the light shield unit.

Description

LED lamp for vehicles {LED lamp for vehicles}

The present invention relates to an LED lamp for a vehicle.

An LED lamp for a vehicle using an LED replacing an existing halogen lamp for a vehicle is being used. LED lamps for vehicles need to meet standards such as the standards (UN Regulations No. 37) of the UN's Economic Commission for Europe (ECE). However, multi-faceted LED lamps, such as those in which LEDs are disposed on four sides, do not meet the ECE light distribution standards.

In particular, unlike conventional halogen lamps, there is a problem in that hot spots having too high illuminus intensity due to non-uniformity of light distribution and overlapping light due to the diffusion angle of LEDs when LEDs are applied. In addition, there is a problem in that light intensity is lowered due to light deviation in a specific angular region.

Republic of Korea Patent No. 10-1577999 (2015.12.10.) Republic of Korea Patent Publication 10-2020-0091754 (2020.07.31.)

An object to be solved by the present invention is to provide a vehicle LED lamp having improved light distribution characteristics.

In the vehicle LED lamp according to an embodiment of the present invention, each LED is disposed and a plurality of light emitting surfaces arranged in a circumferential direction centered on a longitudinal direction, and disposed in a boundary area between the plurality of light emitting surfaces, so that the circumference of the light emitted from the LEDs A light shield member having a plurality of light shield units each configured to limit a direction propagation angle, an end cap configured to block direct forward propagation of light emitted from the LEDs, and some of the light emitted from the LEDs. It includes a reflector ring configured to reflect the forwardly.

The end cap may include a first light reflecting surface disposed in front of the light shield unit and configured to reflect light backward, and the reflector ring disposed behind the light shield unit and reflected light forward. It may include a second light reflecting surface configured to be able to.

The first light reflecting surface may include a front recessed portion that is recessed forward, and the second light reflecting surface may include a rear recessed portion that is recessed backward.

The front concave portion and the rear concave portion may be respectively formed at positions in a circumferential direction corresponding to the light shield portion.

An angle formed between a line perpendicular to the longitudinal direction of the light emitting surface and the first light reflecting surface may be smaller than an angle formed between a line perpendicular to the longitudinal direction of the light emitting surface and the second light reflecting surface.

An angle formed between a 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 a line perpendicular to the longitudinal direction of the light emitting surface and the second light reflecting surface The angle formed may be in the range of between 14 degrees ± 10 degrees.

According to the present invention, not only can the hot spot phenomenon be reduced by the light shield part, but also the problem of lowering the light intensity due to the lack of the LED diffusion angle can be solved through light reflection by the light reflecting surface of the end cap and the reflector ring. It is possible to reduce side effects of light intensity reduction that may be caused by the shield unit.

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

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

Referring to FIGS. 1 and 2 , a plurality of LEDs 11 are arranged to form a multi-sided light emitting structure. For example, in FIGS. 1 and 2, LEDs 11 are disposed 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. In the drawings, a case in which one LED 11 is installed on each surface is illustratively shown, but a plurality of LEDs may be installed on each surface. 4 to 6, a heat pipe 13 having a substantially rectangular cross-sectional profile is supported on a heat sink 27, and a substrate 12 to which an LED 11 is fixed is a four-way heat pipe 13. It may be disposed on the outer circumferential surface of the dog. One end of the heat pipe 13 is exposed to the space where the heat radiation fan 29 of the heat sink 27 is installed, and the heat generated from the LED 11 by the air flow by the operation of the heat radiation fan 29 is transferred to 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 a vehicle through a fastening protrusion 23 provided on an outer circumferential 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 on an outer circumferential surface of the focus ring 21 along a circumferential direction. Meanwhile, a sealing ring 25 for sealing between the focus ring 21 and the lamp housing may be provided on an outer circumferential surface of the focus ring 21 .

An end cap 17 and a reflector ring 19 may be respectively disposed on both sides of the LED 11 . 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 disposed along the X-axis direction, that is, the longitudinal direction, respectively. A cap 17 may be disposed at the tip. The end cap 17 includes a light reflecting surface 171 configured to block light emitted from the LED 11 from directly traveling forward and to reflect the light emitted from the LED 11 backward. The reflector ring 19 is formed in a ring shape to reflect the light emitted from the LED 11 radially outwardly and forwardly. To this end, the end cap 17 may include a ring-shaped light reflecting surface 171 provided on a rear side where the LED 11 is disposed, that is, a surface facing the right side in FIG. 4 , and a reflector ring 19 ) may include a ring-shaped light reflecting surface 191 provided on a front surface where the LED 11 is disposed, that is, a surface 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 reflection surface 171 of the end cap 17 includes a forward recessed portion 172, and the front recessed portion 172 has a circumference corresponding to the light shield unit 15. formed in a directional position. Similarly, the light reflecting surface 191 of the reflector ring 19 includes a rear recessed portion 192 that is recessed backward, and the rear recessed portion 192 is at a circumferential position corresponding to the light shield portion 15. is formed The front and rear recessed portions 172 and 192 formed adjacent to the front and rear ends of the light shield unit 15 allow the light reflected by the light reflecting surfaces 171 and 181 to pass through the front portion (50 degrees from the front to the rear). part) and the rear part (150 degree part from front to back) in the circumferential direction (45 degree, 135 degree, 225 degree, 315 degree part) can prevent hot spots. In addition, the front concave portion 172 secures a forward path of light to prevent a reduction in light intensity.

A light shield member 5 is provided to limit the propagation angle in the circumferential direction of the light emitted from the LEDs 11 disposed on a plurality of surfaces. The light shield member 5 is disposed between the surfaces on which the LEDs 11 are arranged to block light from traveling beyond a certain angular range in the circumferential direction, thereby limiting the propagation angle of the light in the circumferential direction. Referring to light intensity 4, the light shield member 5 may have a tubular shape through which the heat pipe 13 passes, and is disposed between adjacent surfaces on which the LEDs 11 are respectively disposed in the longitudinal direction, That is, an optical shield unit 15 extending in a direction parallel to the forward and backward directions may be provided. For example, as shown in FIG. 5 , when the LEDs 11 are disposed on each of the four surfaces to form a four-sided light-diffusing structure, four light shield units 15 are adjacent to the LEDs 11 are disposed. It is disposed in an area corresponding to a vertex where the light emitting surfaces meet, and at this time, light passage 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 positioned radially outside the LED 11 . The 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 , lines L1 and L2 connecting the upper outer ends of the light shield unit 15 disposed on both sides of the corresponding LED 11 from the center of the upper surface of the LED 11 are the surface of the LED 11. It may be configured to form a predetermined angle (C) with the normal line (L3) of. At this time, the predetermined angle (C) may be an angle of 48 degrees ± 10 degrees. Accordingly, 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 part 152 and a rear support part 153 disposed to face each other so as to be spaced apart from each other in the front-back direction, that is, in the X-axis direction in FIG. The shield unit 15 may be formed in a bridge shape connecting the front support unit 152 and the rear support unit 153 . Meanwhile, the end cap 17 may be fastened to the front support part 152 and the reflector ring 19 and the focus ring 21 may be fastened to the rear support part 153 .

The light shield unit 15 is provided in a central portion corresponding to the LED 11 and has a relatively large width, that is, a central portion 155 having a length in the circumferential direction, and is disposed on both sides of the central portion 155 and has a relatively small A front side part 156 and a rear side part 157 having a width may be provided. 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 portion 156 and the rear side portion 157 means an increase in the size of the light transmission window 151 in these areas, which is 50 degrees from the front of the X axis due to the existence of the light shield portion 15. and to compensate for excessive reduction in luminous intensity in the region of 140 degrees. At this time, as shown in FIG. 7 , the inclination angle (angle with respect to the direction parallel to the X-axis direction) of the edge of the front side part 156 (A) is the inclination angle (B) of the edge of the rear side part 157 can be made larger. For example, the angle of inclination (A) of the edge of the front side portion 156 may be 65 degrees ± 10 degrees, and the angle of inclination (B) of the edge of the rear side portion 157 may be 40 degrees ± 10 degrees. Light emitted from the LED 11 is overlapped in the circumferential direction through the light shield unit 15 of this shape to prevent formation of a hot spot having an excessively high luminous intensity, while securing desired light distribution characteristics.

Referring to FIG. 8, the angle between a line V1 perpendicular to the longitudinal direction (transverse 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 an angle IA2 between a line V2 perpendicular to the longitudinal direction of the light emitting surface and an extension line L6 of the second light reflecting surface 191 . As a specific example, the angle IA1 formed by 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 within a range of 3 degrees ± 10 degrees, and the light emitting surface The angle IA2 formed by the line V2 perpendicular to the line V2 and the extension line L6 of the second light reflection surface 191 may be an angle within a range of 14 degrees ± 10 degrees. The combination of these angles can reduce the decrease in light intensity caused by the existence of the light shield unit 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 of those skilled in the art using the basic concept of the present invention defined in the following claims are also within the scope of the present invention. belong

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: light shield member
15: optical shield unit
151: light transmission 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 arranged in the circumferential direction with the LEDs respectively disposed,
a light shield member disposed in a boundary region between the plurality of light emitting surfaces and having a plurality of light shield parts 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 directly traveling forward, and
A reflector ring configured to reflect some of the light emitted from the LED forward
A vehicle LED lamp comprising a. In paragraph 1,
The end cap includes a first light reflecting surface disposed in front of the light shield unit and configured to reflect light backward,
The reflector ring is disposed behind the light shield unit and includes a second light reflecting surface configured to reflect light forward.
LED lamps for vehicles. In paragraph 2,
The first light reflecting surface includes a front recessed portion that is recessed forward,
The second light reflecting surface includes a rear recessed portion that is recessed backward.
LED lamps for vehicles. In paragraph 3,
The first recessed reflective surface and the second recessed reflective surface are respectively formed at positions in a circumferential direction corresponding to the light shield unit. In paragraph 2,
An angle formed between a line perpendicular to the longitudinal direction of the light emitting surface and the first light reflecting surface is smaller than an angle formed between a line perpendicular to the longitudinal direction of the light emitting surface and the second light reflecting surface. In paragraph 5,
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 LED lamps for vehicles in the range between 14 degrees ± 10 degrees.

Images