KR101664538B1 - Lamp for automobile - Google Patents
Lamp for automobile Download PDFInfo
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- KR101664538B1 KR101664538B1 KR1020140017152A KR20140017152A KR101664538B1 KR 101664538 B1 KR101664538 B1 KR 101664538B1 KR 1020140017152 A KR1020140017152 A KR 1020140017152A KR 20140017152 A KR20140017152 A KR 20140017152A KR 101664538 B1 KR101664538 B1 KR 101664538B1
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- light
- lens
- light emitting
- diffusion lens
- emitting diodes
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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
BACKGROUND OF THE
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
2 is a view schematically showing a state in which light emitted from an
2, the
As is known, in the case of the
3 (a) shows a narrow spot region where light is diffused in the
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
The
When spreading the width of light emitted from the
In addition, when the diffusing
5, the
In this case, the incident angle, which is the angle at which the light emitted from the
7 is a view schematically showing a state in which light emitted from the
When the light passes through the
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
8 to 10 are sectional views showing a main configuration of a lamp according to an embodiment of the present invention. The
Here, the
FIG. 8 shows an embodiment using an
The diffusing
In the embodiment of Fig. 9, when the
The diffusing
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
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
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
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
At this time, the
Particularly, the
Due to the combination of the
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
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
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:
13-1, 13-2: Lens layer 13 ': Notch
20: light transmitting body (inner lens) 21:
Claims (9)
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.
Wherein the light transmitting body is a light diffusing transmission for diffusing light that has passed through the diffusion lens.
Wherein the light transmitting body is an inner lens, and an outer lens is disposed in front of the inner lens.
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.
Wherein one diffusion lens is separately provided for each of the light emitting diodes.
And a plurality of diffusion lenses are integrally provided for the plurality of LEDs.
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.
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.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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KR1020140017152A KR101664538B1 (en) | 2014-02-14 | 2014-02-14 | Lamp for automobile |
Applications Claiming Priority (1)
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KR1020140017152A KR101664538B1 (en) | 2014-02-14 | 2014-02-14 | Lamp for automobile |
Publications (2)
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KR20150096121A KR20150096121A (en) | 2015-08-24 |
KR101664538B1 true KR101664538B1 (en) | 2016-10-11 |
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KR1020140017152A KR101664538B1 (en) | 2014-02-14 | 2014-02-14 | Lamp for automobile |
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KR102600152B1 (en) * | 2018-09-07 | 2023-11-09 | 엘지이노텍 주식회사 | Lighting apparatus and rear lamp having the same |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
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KR101299529B1 (en) * | 2012-08-06 | 2013-08-23 | (주)애니캐스팅 | Lens for light emitting diode, back light unit and display device including the same |
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KR101425588B1 (en) * | 2012-05-31 | 2014-07-31 | 리엔리하이테크(주) | Method of manufacturing led |
US9194566B2 (en) * | 2012-06-08 | 2015-11-24 | Lg Innotek Co., Ltd. | Lamp unit and vehicle lamp apparatus using the same |
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KR101299529B1 (en) * | 2012-08-06 | 2013-08-23 | (주)애니캐스팅 | Lens for light emitting diode, back light unit and display device including the same |
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