KR101664538B1

KR101664538B1 - Lamp for automobile

Info

Publication number: KR101664538B1
Application number: KR1020140017152A
Authority: KR
Inventors: 진요한
Original assignee: 현대자동차주식회사
Priority date: 2014-02-14
Filing date: 2014-02-14
Publication date: 2016-10-11
Also published as: KR20150096121A

Abstract

[0001] The present invention relates to a vehicle lamp, which can expand the spot area of individual LEDs (expanding the width and light distribution area of individual LEDs) while using the LED as a light source, reducing the number of LEDs, And the like. In order to achieve the above object, the present invention provides a light emitting device comprising: a plurality of light emitting diodes arranged in a region where a surface emitting is performed; A diffusion lens disposed in front of each of the light emitting diodes and diffusing light incident from the light emitting diodes; And a light transmitting body arranged to transmit light diffused by the diffusion lens while covering the arrangement of the light emitting diodes and the front of the diffusion lens, And a convex portion extending from the concave central portion toward the outer periphery of the peripheral portion.

Description

[0001] The present invention relates to a lamp for automobile,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a vehicle lamp, and more particularly, to a vehicle lamp that uses a light emitting diode (LED) as a light source while reducing the number of light emitting diodes and achieving surface light emission with improved uniformity.

As is well known, a vehicle is provided with a lighting function that allows an object to be clearly seen during nighttime driving, a lighting function that allows a driver of a vehicle or a driver of another vehicle, a pedestrian to recognize the state of the vehicle (driving state, driving direction, And a plurality of lamps for performing a signal and information transfer function for informing the user.

For example, a high beam lamp and a low beam lamp, a turn signal lamp, a positioning lamp, a fog lamp, and the like of a head lamp assembly, Tail lamps and stop lamps, turn signal lamps, back up lamps, fog lamps, other room lamps, cluster lamps of rear combination lamps, And a ring lamp, and some lamps are legally defined in terms of brightness and color for each application.

In recent years, the use of LED lamps using a light emitting diode (LED) as a light source has been increasing in application because it can reduce the fatigue and reduce the size of a vehicle lamp instead of a conventional incandescent lamp.

The LED lamp is advantageous in that it has low power consumption, long lifetime, fast lighting speed, excellent visibility and safety as compared with conventional incandescent lamps, and has an LED module as a light source, a reflector for setting the direction of light emitted from the LED module, A lens disposed in front of the LED module for transmitting light, and the like.

Vehicle lamps using LEDs as a light source are disclosed in Korean Patent Publication No. 2002-0056534 (July 10, 2002).

On the other hand, considering the recent vehicle design, there is a tendency to expand the surface emission using the LED while designing a large area occupied by the lamp in the vehicle.

However, in the case of an LED lamp, a very large number of LEDs are required to fill a wide irradiation area and a surface emitting area of the lamp because the irradiation angle of the individual LEDs as a light source is narrow.

Although LEDs have recently been made more sophisticated, designing with a large number of LEDs is the mainstream when it comes to designing light in a large area, which is a major factor in manufacturing cost and cost of lamps.

In particular, improvements have been made to increase the number of LEDs continuously in order to uniformly emit uniform light over the entire irradiation area in vehicle lamps having various appearance forms.

FIG. 1 is a view showing an example of a tail lamp that uses an LED as a light source in a lamp for a vehicle. As shown in FIG. 1, the pitch between the LEDs 12 is set so that light can be emitted uniformly along the longitudinal direction of the tail lamp 1 A large number of LEDs are used because the interval is reduced.

2 is a view schematically showing a state in which light emitted from an LED 12 mounted on a substrate 11 of an LED module 10 as a light source in a vehicle lamp is irradiated through the lens 20, (A) of the light source, a light distribution ratio (b) of a single LED, and a light distribution ratio (c) in a state in which a plurality of LEDs are densely arranged to realize surface light emission.

2, the lens 20 may be an inner lens disposed inside the outer lens of the vehicle lamp, and the inner lens 20 may be a diffuser plate having a characteristic capable of diffusing light to some extent, Milky Lens).

As is known, in the case of the LED 12, the emitted light is mainly concentrated in the central portion of the LED as shown in Figs. 2 and 3 (b) and 3 (c) This is a shrinking feature.

3 (a) shows a narrow spot region where light is diffused in the individual LEDs 12, FIG. 3 (b) shows a Gaussian in which light is concentrated in the center of each LED, Type light distribution.

Therefore, when the pitch interval of the LED array is increased and the number of LEDs is made smaller than the proper number, the light spot appears as a spot rather than a surface light due to the individual spot image of the LED when lit.

Accordingly, a method of securing uniformity of light emission by applying a large number of LEDs densely by reducing pitch intervals of LEDs and increasing the number of LEDs is applied for uniform surface emission and spot removal on a long or wide surface.

However, LED pitch reduction ?? Increasing the number of LEDs leads to an increase in cost. When the number of LEDs is increased and the LEDs are arranged in a dense arrangement, the heat dissipation structure must be further considered due to the heat emitted from the LEDs.

Further, in the conventional LED lamp, in order to improve the uniformity, the air gap (see FIG. 2), which is the distance between the LED module and the lens, must be increased, which results in increasing the thickness of the lamp.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to overcome the above-mentioned problems, and it is an object of the present invention to provide a light emitting diode (LED) And which is capable of emitting light with a uniformity and with improved uniformity.

In order to achieve the above object, the present invention provides a light emitting device comprising: a plurality of light emitting diodes arranged in a region where a surface emitting is performed; A diffusion lens disposed in front of each of the light emitting diodes and diffusing light incident from the light emitting diodes; And a light transmitting body arranged to transmit light diffused by the diffusion lens while covering the arrangement of the light emitting diodes and the front of the diffusion lens, Is formed in a shape having a depressed concave shape and having a convex portion from the concave central portion toward the outer periphery of the periphery.

In a preferred embodiment, the light transmitting body may be a light diffusing transmitting body that diffuses light that has passed through the diffusing lens.

In the vehicle lamp of the present invention, the light transmitting body may be an inner lens, and the outer lens may be disposed in front of the inner lens.

In addition, the front surface of the diffusion lens has an angle of incidence θ1 at which the light of the light emitting diode is incident on the normal at each point with respect to the normal, And a diffusing degree? 2 /? 1, which is a ratio value between the incident angle and the outgoing angle, has a convex portion gradually increasing from the center portion to the outer periphery of the periphery, when the outgoing angle is? 2.

In addition, each of the light emitting diodes is provided with one diffused lens separately.

Further, a plurality of diffusion lenses are integrally provided for the plurality of LEDs.

And a reflective portion disposed to surround the light emitting diode and the diffusion lens along the light emitting region in which the light emitting diode is arranged and to reflect light passing through the diffusion lens and guide the light transmitting body forward, And the diffusing lens are integrally formed of a light transmitting material and a reflective material is coated on the inner surface of the reflecting portion to form a reflecting surface.

The diffusion lens is characterized in that two lens layers having different colors are integrally laminated by double injection molding for color conversion and combination of light emitted from a light emitting diode.

The plurality of light emitting diodes may be arranged as a tail lamp or a positioning lamp having a long surface emission area.

Thus, according to the vehicle lamp of the present invention, by disposing a diffusing lens for diffusing light to the outside in front of each LED, it is possible to expand the spot area of the individual LEDs (expanding the width and light distribution area of the individual LEDs) , The number of LEDs can be reduced, and surface light emission with improved uniformity can be achieved.

1 is a view showing an example of a tail lamp that uses an LED light source in a vehicle lamp.
2 is a view schematically showing a state in which light emitted from an LED is irradiated through a lens in a lamp for a vehicle.
FIG. 3 shows a light distribution ratio (c) in a state in which a spot region (a) of the LED light source, a light distribution ratio (b) of a single LED, and a plurality of LEDs are densely arranged in order to realize plane light emission.
4 is a view showing an LED and a diffusion lens in a vehicle lamp according to an embodiment of the present invention.
5 is a view illustrating a state where light emitted from an LED is emitted through a diffusion lens in a vehicle lamp according to an embodiment of the present invention.
6 is a view showing that the width of a light is expanded by a diffusion lens in a vehicle lamp according to an embodiment of the present invention.
7 is a view schematically showing a state in which light is irradiated through a diffusion lens and an inner lens in a vehicle lamp according to an embodiment of the present invention.
8 to 10 are sectional views showing a main configuration of a vehicle lamp according to an embodiment of the present invention.
11 is a view for explaining a method of manufacturing a two-color diffusion lens by a dual injection method.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art to which the present invention pertains.

The present invention can extend the spot area of individual LEDs (expanding the width and light distribution area of individual LEDs) while using LEDs (light emitting diodes) as light sources, and capable of reducing the number of LEDs, And to provide a lamp for a vehicle.

The lamp of the present invention can be applied to a vehicle lamp having a long surface emitting region by arranging a plurality of LEDs such as a tail lamp or a positioning lamp of a vehicle as shown in FIG. 1, and in addition, It is possible to apply without limit.

FIG. 4 is a view showing an LED and a diffusion lens in a vehicle lamp according to an embodiment of the present invention. FIG. 5 is a view illustrating a state in which light emitted from an LED passes through a diffusion lens in a vehicle lamp according to an embodiment of the present invention Fig.

6 is a view showing that the width of the light is expanded by the diffusion lens in the vehicle lamp according to the embodiment of the present invention.

As shown in the figure, the vehicle lamp according to the present invention uses an LED 12 as a light source, and a separate diffusing lens 13 for diffusing light emitted from the LEDs in front of the individual LEDs 12 to a wider width, .

The diffusion lens 13 is disposed so as to allow light emitted from each LED 12 to diffuse and pass therethrough. As shown in FIG. 4, It is used to expand the area widely.

When spreading the width of light emitted from the individual LEDs 12 by using the diffusing lens 13, it is possible to increase the pitch interval between the LEDs compared with the conventional case when the same light emitting area is prepared, .

In addition, when the diffusing lens 13 is applied, the spot by the individual LEDs 12 can be removed and uniform light emission can be achieved in the light emitting region of the entire lamp. Even in the wide range of the individual LEDs, The light emission on-off filling can be improved.

5, the diffusion lens 13 has a concave shape in which a center portion 13a of the front surface of the lens, that is, a lens center portion 13a in which the LED 12 is located immediately behind the lens, is recessed And has a gradually convex portion 13b from the concave central portion 13a to the outer periphery thereof.

In this case, the incident angle, which is the angle at which the light emitted from the LED 12 is incident on each point on the front surface of the lens 13 with reference to the normal (nomal), is? 1, The front surface shape of the diffusing lens is designed so that the value of the diffusion degree? 2 /? 1, which is a ratio value of the incident angle and the emission angle, gradually increases from the lens center portion 13a toward the outer periphery.

7 is a view schematically showing a state in which light emitted from the LED 12 is irradiated through the diffusion lens 13 and the inner lens 20 in the vehicle lamp according to the embodiment. The light emitted from the individual LEDs 12 can be diffused widely toward the outsides by the diffusing lens 13.

When the light passes through the inner lens 20 of the lamp and the outer lens (not shown) to form the surface light emission, the light can be emitted at a uniform intensity in the light emission area, And excellent uniformity of light emission on the surface can be ensured, so that the quality of the lamp can be improved and the light filling can be improved.

In addition, the pitch interval between the LEDs can be increased to reduce the number of LEDs used, the heat dissipation problem can be improved by reducing the number of LEDs, and the air gap can be reduced. Therefore, the module including the light source unit, It is possible to reduce the thickness.

The inner lens 20 is a light transmitting body arranged so as to allow light diffused by the diffusion lens to be transmitted while covering the arrangement of the LED 12 and the front of the diffusion lens 13, (Diffuser Plate, Milky Lens) having a characteristic capable of diffusing light.

8 to 10 are sectional views showing a main configuration of a lamp according to an embodiment of the present invention. The LED module 10 comprises a substrate 11 as a light source and an LED 12 mounted thereon. A diffusing lens 13 for diffusing the emitted light, a reflecting part 21 for reflecting the light passing through the diffusing lens 13 and guiding the light transmitting body 20 forward, (Inner lens) 20 provided on the front surface of the light transmitting body 21 is shown.

Here, the reflective portion 21 may be formed in a shape of a bezel disposed in front of the LED 12 and the diffusion lens 13 arranged along the light emitting region using an impermeable material that does not transmit light , And a reflective material (for example, Al) is vapor-deposited on the inner surface of the reflective portion 21 to form a reflective surface.

FIG. 8 shows an embodiment using an individual diffusion lens 13 disposed on the front surface of each LED 12, and FIG. 9 shows an embodiment using an integral diffusion lens 13 for a plurality of LEDs 12 arranged. For example.

The diffusing lens 13 is disposed in front of the LED 12 as a light source and may be fixed to the LED module 10 or fixed to the reflector 21, (See Fig. 9).

In the embodiment of Fig. 9, when the diffusion lens 13 integrally formed with the plurality of LEDs 12 is applied, the front shape of the diffusion lens 13 should have the shape of the diffusion lens described above.

The diffusing lens 13 may be integrally formed with the reflecting portion 21. In this case, the reflecting portion 21, in which the diffusing lens 13 is formed integrally using the light-transmitting material, A reflective material (for example, Al) for reflection and masking of light is deposited and coated on the inner surface of the reflective portion 21 which needs to be reflected in order to guide the front of the reflective surface 21 to form a reflective surface.

When such an integrated diffusion lens is applied, there is an advantage over the light diffusion structure having a single diffusion lens, one for each LED 12, in terms of scattering and defects in assembly, production control problems, quality problems, There is an advantage that the air flow is reduced.

FIG. 10 is a view showing that the color of light emitted through various color combinations can be variously set in the lamp of the embodiment. In the embodiments shown in FIGS. 8 and 9, a white light LED can be used. LEDs of various colors such as a red light LED may be used, and it is also possible to set the color of light through color combination as in the embodiment of FIG.

That is, the diffusion lens 13 having a structure in which the LEDs 12 of a specific color are used and the lens layers 13-1 and 13-2 of different colors are integrally laminated through the double injection are manufactured and used .

For example, a two-color diffusion lens 13 (red light LED) having a blue lens layer 13-1 and a green lens layer 13-2 is used, ) Can be used, and other combinations of colors are also possible.

The diffusion lens 13 has a diffusion function for diffusing light emitted from the LED 12 and a light conversion function for converting the color of light emitted from the LED.

FIG. 11 is a view for explaining a method of manufacturing a two-color diffusion lens by a dual injection molding method, in which two slide molds 100 and 200 in which a mold is opened and closed, and a slide movement In the mold apparatus including the slide core 300, the two color resins are injected through the individual gate runners 101 and 102 to form the lens layers 13-1 and 13-2 having the respective colors integrally.

At this time, the slide core 300 moves between the joining portions of the two slide molds 100 and 200 at the time of injection, and is tightly combined with the slide core 300 to seal the molding space (cavity) inside the mold together with the slide molds 100 and 200 in the closed state .

Particularly, the slide molds 100 and 200 prevent the color mixing caused by the mixing of the resin at the boundary of the lens layers 13-1 and 13-2 and the boundary (two-color boundary) of the lens layers 13-1 and 13-2, And the end of the slide core 300 can protrude inward along the periphery of the cavity (lens forming space) inside the slide molds 100 and 200 when the mold is closed do.

Due to the combination of the slide cores 300, a notched portion 13 'in a cross section is formed along the entire circumference of the boundary between the two lens layers 13-1 and 13-2 of the diffusion lens 13. [

At the time of molding, two kinds of resins for molding the respective lens layers 13-1 and 13-2 are simultaneously injected into the cavity through the individual gate runners 101 and 102 after the mold is closed, Can be formed.

Of course, in the case of the front lens layer 13-1 in the two lens layers 13-1 and 13-2, the shape of the front surface of the lens layer 13-1 is a concave shape in which the central portion 13a is recessed And has a shape having a gradually convex portion 13b from the concave central portion 13a to the outer periphery of the periphery.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the scope of the present invention is not limited to the disclosed exemplary embodiments. Forms are also included within the scope of the present invention.

10: LED module 11: substrate
12: LED 13: diffuse lens
13a: central portion 13b: convex portion
13-1, 13-2: Lens layer 13 ': Notch
20: light transmitting body (inner lens) 21:

Claims

A plurality of light emitting diodes arranged in a region where surface light emission is performed;
A diffusion lens disposed in front of each of the light emitting diodes and diffusing light incident from the light emitting diodes;
A light transmitting body arranged to transmit light diffused by the diffusion lens while covering an array of the light emitting diodes and a diffusion lens front; And
A reflector for reflecting the light having passed through the diffuser lens and guiding the light guide through a forward direction in which the light guide is positioned, the bezel being disposed in front of the light emitting diode and the diffusion lens along the light emission area in which the light emitting diodes are arranged;
/ RTI >
Wherein the reflective portion and the diffusing lens are integrally formed of a light transmitting material and a reflective material is coated on the inner surface of the reflective portion to form a reflective surface,
Wherein the front surface of the diffusing lens has a concave shape in which a center portion in which the light emitting diode is located is recessed right and rear, and a portion having a convex portion from the concave center portion toward the outer periphery of the periphery.

The method according to claim 1,
Wherein the light transmitting body is a light diffusing transmission for diffusing light that has passed through the diffusion lens.

The method according to claim 1 or 2,
Wherein the light transmitting body is an inner lens, and an outer lens is disposed in front of the inner lens.

The method according to claim 1,
The front surface of the diffusion lens
When an incident angle, which is the angle at which the light of the light emitting diode is incident on the normal at each point, is θ1, and an outgoing angle, which is the angle at which the light passes through the front surface after passing through the diffusion lens,
Wherein a diffusion degree? 2 /? 1, which is a ratio value between the incident angle and the emission angle, has a convex portion gradually increasing from the central portion toward the outer periphery of the periphery.

The method according to claim 1,
Wherein one diffusion lens is separately provided for each of the light emitting diodes.

The method according to claim 1,
And a plurality of diffusion lenses are integrally provided for the plurality of LEDs.

delete

The method according to claim 1,
Wherein the diffusion lens has a structure in which two lens layers of different colors are integrally laminated by double injection molding for color conversion and combination of light emitted from the light emitting diode.

The method according to claim 1,
Wherein the plurality of light emitting diodes are formed as a tail lamp or a positioning lamp having a long surface emitting region arranged long.