Lamp for vehicle

Provided is a lamp for a vehicle to prevent light efficiency from being deteriorated while being embodied in a slim form factor. The lamp for a vehicle includes a light emission portion to generate light; a first optical portion disposed in front of the light emission portion to allow the light generated from the light emission portion to be incident thereto; and a second optical portion disposed between the light emission portion and the first optical portion. The second optical portion refracts the light in a direction different from a light refracting direction of the first optical portion.

CROSS-REFERENCE TO RELATED APPLICATION

This application claims priority to Korean Patent Application No. 10-2020-0127573 filed on Sep. 29, 2020, which application is herein incorporated by reference in its entirety.

BACKGROUND

1. Technical Field

The present disclosure relates to a lamp for a vehicle, and more particularly, to a lamp for a vehicle that may prevent light efficiency from being deteriorated while embodying a slim form factor.

2. Description of the Related Art

Generally, a vehicle is equipped with various lamps having an illumination function for more easily recognizing an object positioned in the vicinity of the vehicle during low light conditions (e.g., nighttime driving), and a signaling function for informing a nearby vehicle or pedestrian of a driving state of the vehicle. Installation criteria and specifications for the lamps for a vehicle are regulated by law so that each lamp may adequately perform its function.

For example, a main purpose of a head lamp and a fog lamp is the illumination function, and a main purpose of a turn-signal lamp, a tail lamp, a brake lamp, or the like is the signaling function.

The lamp for a vehicle includes a light source as well as a lens configured to form a beam pattern suitable for functions of the lamp for a vehicle by irradiating light generated from the light source to the outside, and a lamp image is formed by the light irradiated to the outside through the lens. The light source generates light having a predetermined light irradiation angle with respect to a light axis, and the lens is formed to have a size that allows the light generated from the light source to be incident thereto with as little loss as possible.

While the lamp for a vehicle has traditionally been only a means for an illumination function and a signaling function, the significance of the lamp has been recently increased in view of design. That is, in addition to a functional aspect of helping a driver to safely drive a vehicle by ensuring the driver's visibility, which is a basic role of the lamp for a vehicle, an aesthetic aspect through design improvement, perceived by a consumer, makes a significant influence on the consumer's decision in buying a vehicle.

To this end, studies for improving an exterior design by allowing a lamp for a vehicle to have a slimmer form factor have been actively ongoing. However, when a size of a lens is reduced to embody a slim form factor, light loss increases due to the light failing to enter the lens among lights generated from the light source, whereby light efficiency may be deteriorated.

Therefore, a method for preventing light efficiency from being deteriorated while embodying a slim form factor has been required.

SUMMARY

The present disclosure has been devised to solve the above-mentioned problems, and an object of the present disclosure is to provide a lamp for a vehicle, which may prevent light efficiency from being deteriorated while embodying a slim form factor by using a plurality of lenses that refract light in different directions.

Another object of the present disclosure is to provide a lamp for a vehicle, which may emit parallel light even in the case that both sides of at least one of a plurality of lenses are formed to be asymmetric to each other in at least one direction.

The objects of the present disclosure are not limited to those mentioned above, and additional objects of the present disclosure, which are not mentioned herein, will be clearly understood by those skilled in the art from the following description of the present disclosure.

According to an aspect of the present disclosure, a lamp for a vehicle may include a light emission portion to generate light; a first optical portion disposed in front of the light emission portion to allow the light generated from the light emission portion to be incident thereto; and a second optical portion disposed between the light emission portion and the first optical portion, the second optical portion configured to refract the light in a direction different from a light refracting direction of the first optical portion.

The second optical portion may refract the light toward a same side as the light refracting direction of the first optical portion. The second optical portion may refract the light toward an opposite side of the light refracting direction of the first optical portion. The second optical portion may refract the light at a refractive angle different from a refractive angle of the first optical portion.

Further, an emission surface of the first optical portion may form a portion of a contour of an exterior of the vehicle.

Both sides of the emission surface of the first optical portion may be formed to be asymmetrical to each other along at least one direction with respect to a center line that passes through a center of the first optical portion in a front and back direction.

A rear focal point of the first optical portion may be formed at a position spaced apart from the center line by a predetermined interval.

Both sides of at least one of an incident surface of the first optical portion, an incident surface of the second optical portion, or an emission surface of the second optical portion may be formed to be asymmetrical to each other along at least one direction with respect to the center line to allow the light to be emitted from the first optical portion in a direction substantially parallel with the center line. Both sides of at least one of an incident surface of the first optical portion, an incident surface of the second optical portion, or an emission surface of the second optical portion may be different from one another in terms of at least one of their forming angles or curvatures along at least one direction with respect to the center line.

The second optical portion may allow the light directed to outside of the incident surface of the first optical portion to be refracted and incident to the incident surface of the first optical portion.

A shield portion may be further provided for shielding at least a portion of the light proceeding from the light emission portion to the second optical portion.

The shield portion may include a reflective surface formed on a surface for shielding at least a portion of the light generated from the light emission portion to reflect the shielded light toward the first optical portion. The reflective surface may be formed such that a rear end thereof is spaced apart farther from the center line that passes through the center of the first optical portion than a front end thereof.

The light emission portion may include a first light source portion disposed above the shield portion, and a second light source portion disposed below the shield portion. Further, a reflective surface configured to reflect at least a portion of the light shielded by the shield portion toward the first optical portion may be formed on at least one of an upper surface or a lower surface of the shield portion.

The aforementioned lamp for a vehicle of the present disclosure may provide one or more advantageous effects as follows. Even in the case that a first optical portion and a second optical portion, which are disposed in a front and back direction, refract light in different directions, and an emission surface of the first optical portion is formed to be asymmetrical with respect to a center line that passes through a center in parallel with the front and back direction, since a light path of the second optical portion is corrected, the light may be emitted from the first optical portion in a direction substantially parallel with the center line, whereby an undesired beam pattern may be prevented from being formed.

Also, since the light exiting the first optical portion may be refracted by the second optical portion and then may enter the first optical portion, even in the case that the first optical portion has a slim form factor, the light efficiency may be prevented from being deteriorated.

The effects according to the embodiment of the present disclosure are not limited to those mentioned above, and more various effects are included in the following description of the present disclosure.

DETAILED DESCRIPTION

In some embodiments, well-known steps, structures and techniques will not be described in detail to avoid obscuring the invention.

Embodiments of the invention are described herein with reference to plan and cross-section illustrations that are schematic illustrations of idealized embodiments of the invention. As such, variations from the shapes of the illustrations as a result, for example, of manufacturing techniques and/or tolerances, are to be expected. Thus, embodiments of the invention should not be construed as limited to the particular shapes of regions illustrated herein but are to include deviations in shapes that result, for example, from manufacturing. In the drawings, respective components may be enlarged or reduced in size for convenience of explanation.

Hereinafter, the embodiments of the present disclosure will be described with reference to the accompanying drawings illustrating a lamp for a vehicle.

FIG.1is a perspective view illustrating a lamp for a vehicle according to an embodiment of the present disclosure,FIG.2is a side view illustrating a lamp for a vehicle according to an embodiment of the present disclosure, andFIG.3is a plan view illustrating a lamp for a vehicle according to an embodiment of the present disclosure. Referring toFIGS.1to3, a lamp1for a vehicle according to an embodiment of the present disclosure may include a light emission portion100, a first optical portion200, and a second optical portion300.

The lamp1for a vehicle of the present disclosure will be described based on a configuration to be used as headlamp for securing a front field of vision of a driver by irradiating light in a driving direction of the vehicle when the vehicle operates in low light conditions (e.g., at night time), but the present disclosure is not limited thereto. The lamp1for a vehicle of the present disclosure may be used not only as a headlamp but also as any of a variety of lamps installed in a vehicle, such as a tail lamp, a brake lamp, a fog lamp, a daytime running lamp, a turn-signal lamp, a backup lamp, and the like.

The light emission portion100may generate light having light amount and/or color suitable for a purpose of the lamp1for a vehicle of the present disclosure, and a shield portion400configured to shield a portion of the light generated from the light emission portion100may be disposed at the front of the light emission portion100to form a low beam pattern having a predetermined cut-off line. However, the present disclosure is not limited thereto, and the shield portion400may be omitted in accordance with the beam pattern formed by the lamp1for a vehicle of the present disclosure.

The light emission portion100may include a plurality of light source modules101arranged in a left and right direction, and in the embodiment of the present disclosure, an example where the plurality of light source modules101are disposed above the shield portion400to form a low beam pattern having a predetermined cut-off line by the light generated from the light emission portion100will be described by way of example. Each of the plurality of light source modules101may include a light source101aand a reflector101bthat reflects the light generated from the light source101atoward the forward direction.

The light source101amay be disposed at a first focal point of the reflector101b, and the light generated from the light source101amay be reflected by the reflector101band concentrated on a second focal point in front of the reflector101b. When the light emission portion100includes the plurality of light source modules101, the first focal points of the plurality of light source modules101may be formed at their respective positions that are different from one another, and the second focal points thereof may be formed at a same position. Hereinafter, in the embodiment of the present disclosure, a second focal point of the reflector101bwill be referred to as a focal point F of the light emission portion100.

In particular, in the embodiment of the present disclosure, the case that the light generated from the light source101ais reflected toward the front by the reflector101bwill be described by way of example. However, the present disclosure is not limited to such a configuration, and not only the reflector101bbut also various types of optical elements, such as a mirror or prism, which allow the light generated from the light source101ato move toward the front, may be used.

Further, in the embodiment of the present disclosure, the case that the light emission portion100includes four light source modules101arranged in a left and right direction will be described by way of example. However, this configuration is merely exemplary to assist understanding of the present disclosure. The present disclosure is not limited thereto, and various modifications may be made in the number, arrangement direction, position, or the like of the light source modules included in the light emission portion100, depending on light distribution characteristics such as size, shape and brightness of the beam pattern formed by the lamp1for a vehicle of the present disclosure.

When the light emission portion100includes the plurality of light source modules101, the plurality of light source modules101may respectively form different regions of the low beam pattern. For example, any one of the plurality of light source modules101may form a high illumination region of the low beam pattern and another one of the plurality of light source modules101may form a spread region of the low beam pattern. Any one of the plurality of light source modules101may be positioned to be tilted at a predetermined angle with respect to the another depending on the region formed in each of the plurality of light source modules101.

The first optical portion200may be disposed in front of the light emission portion100such that incident light may be emitted from the light emission portion100to form a beam pattern suitable for the purpose of the lamp1for a vehicle of the present disclosure. The first optical portion200may include a first incident surface210and a first emission surface220, and the light irradiated from the lamp1for a vehicle of the present disclosure may be understood as the light emitted from the first emission surface220.

In order that the beam pattern suitable for the purpose of the lamp1for a vehicle of the present disclosure is formed by the light emitted from the first emission surface220, the first emission surface220may be required to be positioned at the outermost part of the vehicle. In this case, the first emission surface220may form a portion of a contour of the vehicle exterior.

The first emission surface220may be formed such that both sides thereof are symmetrical to each other with respect to a center line C that passes through the center of the first optical portion200in parallel with a forward and backward direction, depending on the contour of the vehicle exterior, or may be formed such that both sides thereof are asymmetrical to each other along at least one direction with respect to the center line C. In the examples shown inFIGS.1to3, both sides of the first emission surface220are formed to be symmetrical to each other in an up and down direction with respect to the center line C and formed to be asymmetrical to each other in a left and right direction.

In particular, the case that both sides of the first emission surface220are formed to be asymmetrical to each other along at least one direction with respect to the center line C may be understood that both sides are different from each other in at least one of their forming angles, curvatures, or sizes (lengths) with respect to the center line C.

Accordingly, when both sides of the first emission surface220are formed to be asymmetrical to each other along at least one direction with respect to the center line C, a rear focal point F′ of the first optical portion200may be formed at a position different from that of the focal point F of the light emission portion100as shown inFIG.4. In this case, the rear focal point F′ of the first optical portion200may be formed to be spaced apart from the center line C by a predetermined interval in one side direction and thus at least a portion of incident light from the light emission portion100may be emitted to be titled at a predetermined angle with respect to the center line C, whereby an undesired beam pattern may be formed.

In other words, the light emission portion100may be generally designed to concentrate light on the rear focal point of the first optical portion200when both sides of the first optical portion200are formed to be symmetrical to each other with respect to the center line C. However, when both sides of the first emission surface220are formed to be asymmetrical to each other along at least one direction with respect to the center line C, the position of the rear focal point of the first optical portion200may be varied, whereby the position on which the light generated from the light emission portion100is concentrated and the rear focal point of the first optical portion200may become different from each other. In this case, at least a portion of the light emitted from the first emission surface220may be titled at a predetermined angle with respect to the center line C.

For example, when the lamp1for a vehicle of the present disclosure is used as a headlamp, the light irradiated from the lamp1for a vehicle of the present disclosure may need to be irradiated toward the front of the vehicle. However, when both sides of the first emission surface220are formed to be asymmetrical to each other along at least one direction with respect to the center line C in order to correspond to the contour of the vehicle exterior, the light emitted from the first emission surface220may not be parallel with the center line C. Accordingly, it may be difficult to form a beam pattern that is suitable for the headlamp.

In other words, when the first emission surface220has an aspherical shape of which both sides are symmetrical to each other with respect to the center line C, incident light that transmits from the light emission portion100through the rear focal point of the first optical portion200may be emitted in a direction parallel with the center line C through the first emission surface220. On the other hand, when both sides of the first emission surface220are asymmetrical to each other along at least one direction with respect to the center line C, the position on which the light generated from the light emission portion100is concentrated and the rear focal point of the first optical portion200may become different from each other. As a result, at least a portion of the light emitted from the first optical portion200may be titled by some angle in at least one direction with respect to the center line C.

In the embodiment of the present disclosure, even in the case that both sides of the first emission surface220are formed to be asymmetrical to each other along at least one direction with respect to the center line C, a path of the light that transmits from the light emission portion100toward the first optical portion200may be corrected via a second optical portion300to allow the light emitted from the first emission surface220to be substantially parallel with the center line C.

The second optical portion300may include a second incident surface310where the light generated from the light emission portion100enters, and a second emission surface320that emits the light entering the second incident surface310to the first optical portion200. In the embodiment of the present disclosure, the case that the second optical portion300is disposed between the focal point F of the light emission portion100and the first optical portion100will be described by way of example.

The second optical portion300may correct the light emitted from the first emission surface220to be parallel with the center line C by refracting the light in a direction different from a refractive direction of the light refracted by the first optical portion200even in the case that both sides of the first emission surface220are formed to be asymmetrical to each other in at least one direction with respect to the center line C.

In the embodiment of the present disclosure, the case that the second optical portion300refracts light in a direction different from the refractive direction of light refracted by the first optical portion200may include the case that the second optical portion300refracts light toward an opposite side from the refractive direction of light refracted by the first optical portion200, the case that the second optical portion300refracts light toward a same side as the refractive direction of light refracted by the first optical portion200but has a light refractive angle different from that of the first optical portion200, and the case that the second optical portion300refracts light toward an opposite side from the refractive direction of light refracted by the first optical portion200and has a light refractive angle different from that of the first optical portion200.

FIGS.5and6are schematic views illustrating a light path of a lamp for a vehicle according to an embodiment of the present disclosure.FIG.5is an example showing a light path in a left and right side, andFIG.6is an example showing a light path in an up and down direction.

Referring toFIG.5, in the lamp1for a vehicle according to the embodiment of the present disclosure, when the light generated from the light emission portion100directly enters the first optical portion200, since both sides of the first emission surface220are formed to be asymmetrical to each other along the left and right direction with respect to the center line C, at least a portion of the light emitted from the first emission surface220may be tilted at a predetermined angle in the left and right direction with respect to the centerline C as shown in broken lines. On the other hand, when the light path is adjusted by the second optical portion300before the light generated from the light emission portion100enters the first optical portion200, the light that enters the first optical portion200may be emitted to be parallel with the center line C.

In the embodiment of the present disclosure, the case that the first emission surface220has a curved shape in which a second end disposed at an outer side of the vehicle is closer to the light emission portion100than a first end disposed at an inner side of the vehicle in the left and right direction will be described by way of example. In this case, both sides of each of the first incident surface210, the second incident surface310, and the second emission surface320may be formed to be asymmetrical to each other in a left and right direction with respect to the center line C such that the light emitted from the first emission surface220is parallel with the center line C.

For example, when the first incident surface210has a curved shape in which the second end that is disposed at the outer side of the vehicle is closer to the light emission portion100than the first end that is disposed at the inner side of the vehicle in the left and right direction, the second incident surface310may have a planar shape in which a first end that is disposed at the inner side of the vehicle is closer to the light emission portion100than a second end that is disposed at the outer side of the vehicle in the left and right direction, and the second emission surface320may have a shape in which the second side disposed at the outer side of the vehicle has a curvature greater than that of the first side disposed at the inner sider of the vehicle with respect to the center line C, whereby the light emitted from the first emission surface220may proceed in substantially parallel with the center line C even in the case that the first emission surface220is formed to be asymmetrical in the left and right direction with respect to the center line C.

Referring toFIG.6, it is noted that both sides of the first emission surface220are formed to be symmetrical to each other in an up and down direction with respect to the center line C. In this case, the first incident surface210, the second incident surface310, and the second emission surface320may be formed such that their respective both sides are symmetrical to each other in the up and down direction with respect to the center line C. In particular, inFIGS.5and6, F may be understood as a point on which the light generated from the light emission portion100is concentrated, that is, a focal point F of the light emission portion100, when both sides of the first optical portion100are formed to be symmetrical to each other with respect to the center line C.

In the embodiment of the present disclosure, the case that both sides of the first emission surface220are formed to be asymmetrical to each other along at least one direction with respect to the center line C and the case that both sides of each of the first incident surface210, the second incident surface310, and the second emission surface320are formed to be asymmetrical to each other along at least one direction with respect to the center line C have been described as examples. However, the present disclosure is not limited to these examples, based on the shape of the first emission surface220, both sides of at least one of the first incident surface210, the second incident surface310, or the second emission surface320may be formed to be asymmetrical to each other along at least one direction with respect to the center line C.

Further, even in the case that both sides of the first emission surface220are formed to be symmetrical to each other with respect to the center line C, both sides of at least one of the first incident surface210, the second incident surface310, or the second emission surface320may be formed to be asymmetrical to each other along at least one direction with respect to the center line C such that the light may be emitted from the first emission surface220substantially in parallel with the center line C.

Meanwhile, in addition to allowing the light emitted from the first emission surface220to be parallel with the center line C, the second optical portion300may also allow light that would otherwise proceed with an angle wider than the first optical portion200, among the light beams generated from the light emission portion100, to be bent and incident on the first optical portion200, thereby improving light efficiency.

In other words, as shown inFIGS.5and6, the second optical portion300may adjust a light path such that the light moving toward the direction that would be outside of the first optical portion200among the lights generated from the light emission portion100may enter the first optical portion200. Accordingly, the light efficiency may be improved, whereby a beam pattern of sufficient brightness may be formed even in the case that the second optical portion300has a slim form factor.

For example, when the first optical portion200has a slim form factor (i.e., a form factor that extends in the left and right direction and where the horizontal width is substantially greater than the vertical height), the amount of light entering the first optical portion200may be relatively reduced. As such, in order that the beam pattern of sufficient brightness is formed, an electrical current applied to the light emission portion100may be required to be increased, which would decrease the light efficiency. However, in the embodiment of the present disclosure, since the light that proceeds toward the direction outside of the first optical portion200among the lights generated from the light emission portion100may enter the first optical portion200due to the second optical portion300, the beam pattern of sufficient brightness may be formed without increasing the electrical current applied to the light emission portion100, whereby power consumption may be prevented from being increased.

In the lamp1for a vehicle of the present disclosure, a portion of the light generated from the light emission portion100may be shielded by the shield portion400, and at least a portion of the light shielded by the shield portion400may be reflected toward the front such that the light efficiency may be prevented from being deteriorated due to the light shielded by the shield portion400.

FIG.7is a sectional view showing a shield portion according to the embodiment of the present disclosure. More particularly,FIG.7shows an example of a light path of any one of the plurality of light source modules101. Referring toFIG.7, a front end of the shield portion400according to the embodiment of the present disclosure may be disposed at or near the focal point F of the light emission portion100to shield at least a portion of the light generated from the light emission portion100, to allow a cut-off line of a low beam pattern to be formed.

In particular, the shield portion400may include a reflective surface410formed on at least a portion of a surface by which a portion L12of lights L11and L12that are generated from the light emission portion100is shielded. Accordingly, the reflective surface410may reflect at least a portion of the light that is shielded by the shield portion400toward the front. By way of example, the reflective surface410may be formed via deposition or coating of a material, such as aluminum or chrome, which has high reflectivity.

The reflective surface410may be formed such that its rear end may be spaced apart from the center line C farther than its front end. Accordingly, at least a portion L12of the lights shielded by the shield portion400may be reflected toward the front by the reflective surface410. In the embodiment of the present disclosure, the case that the reflective surface410has a planar shape in which the reflective surface410is formed to be upwardly inclined from the front end toward the rear end will be described by way of example. However, the present disclosure is not limited to this example, and the reflective surface410may have a curved shape or a combined shape of the planar shape and the curved shape.

Further, in the embodiment of the present disclosure, the case that the reflective surface410is formed on an upper surface of the shield portion400such that the light shielded by the shield portion400is reflected on the reflective surface410to form a cut-off line of a low beam pattern will be described by way of example. However, the present disclosure is not limited to this example, and the reflective surface410may be formed on a lower surface of the shield portion400as well as the upper surface of the shield portion400depending on the beam pattern formed by the lamp1for a vehicle of the present disclosure.

Meanwhile, in the aforementioned embodiment, the case that the lamp1for a vehicle of the present disclosure forms a low beam pattern has been described by way of example. However, the present disclosure is not limited to this example, and the lamp1for a vehicle of the present disclosure may form a plurality of different beam patterns.

FIG.8is a perspective view illustrating a lamp for a vehicle according to another embodiment of the present disclosure, andFIG.9is a side view illustrating a lamp for a vehicle according to another embodiment of the present disclosure. Referring toFIGS.8and9, the lamp1for a vehicle according to another embodiment of the present disclosure may include a light emission portion100, a first optical portion200, and a second optical portion200. In another embodiment of the present disclosure, the same reference numerals will be used for the same or similar elements as those of the aforementioned embodiment, and their detailed description will be omitted.

In another embodiment of the present disclosure, the light emission portion110may include a first light source portion110disposed above the shield portion400, and a second light source portion120disposed below the shield portion400. The first light source portion110may include a plurality of light source modules111, each of which includes a light source111aand a reflector111b, and the second light source portion120may include a plurality of light source modules121, each of which includes a light source121aand a reflector121b. The plurality of light source modules111of the first light source portion110and the plurality of light source modules121of the second light source portion120may be arranged in a left and right direction.

The first light source portion110may generate a first light beam for forming a first beam pattern, and the second light source portion120may generate a second light beam for forming a second beam pattern. In another embodiment of the present disclosure, the case that the first light source portion110and the second light source portion120respectively include the plurality of light source modules111and121arranged in the left and right direction will be described by way of example. However, this configuration is only an example to assist understanding of the present disclosure, and the present disclosure is not limited thereto. The number and arrangement direction of the light source modules included in each of the first light source portion110and the second light source portion120may be varied depending on light distribution characteristics of the beam pattern formed by the lamp1for a vehicle of the present disclosure.

In another embodiment of the present disclosure, the case that the first light source portion110forms a low beam pattern as the first beam pattern, and the second light source portion120forms a high beam pattern as the second beam pattern will be described by way of example. The second light source portion120may be illuminated together with the first light source portion110to ensure a wide viewing range and a long viewing distance in front of the vehicle.

FIG.10is a schematic view illustrating a beam pattern formed by a lamp for a vehicle according to another embodiment of the present disclosure. Referring toFIG.10, in the lamp1for a vehicle according to another embodiment of the present disclosure, a portion of the light generated from at least one of the first light source portion110and the second light source portion120may be shielded by the shield portion400such that an upper boundary of a low beam pattern P1, that is, a cut-off line CL is formed, and a lower boundary of a high beam pattern P2is formed. In this case, however, there may be a concern that the light efficiency may be deteriorated due to the light shielded by the shield portion400.

In another embodiment of the present disclosure, to prevent the light efficiency from deteriorating due to the light shielded by the shield portion400, at least a portion of the light shielded by the shield portion400may be configured to be reflected toward the front.

FIG.11is a schematic view illustrating a shield portion according to another embodiment of the present disclosure. Referring toFIG.11, the shield portion400according to another embodiment of the present disclosure may include a reflective surface420, formed on a lower surface, to reflect at least a portion of the light generated from the second light source portion120toward the front.

In another embodiment of the present disclosure, the reflective surface420may reflect the shielded light among the lights generated from the second light source portion120toward the front. Similar to the reflective surface410of the aforementioned embodiment, the reflective surface420may have a planar shape, a curved shape, or a combination thereof, in which its rear end is spaced apart farther from the center line C than its front end.

As described above, when the reflective surface420is formed on the lower surface of the shield portion400, a portion L1of the lights generated from the first light source portion110may bypass the shield portion400, and the portion L22that would otherwise be shielded by the shield portion400may be reflected toward the front by the reflective surface420, whereby the light efficiency may be improved even though the second optical portion200has a slim form factor.

In another embodiment of the present disclosure, the case that the reflective surface420is formed on the lower surface of the shield portion400has been described by way of example. However, the present disclosure is not limited to this example, the reflective surface410may be formed on the upper surface of the shield portion400similarly to the aforementioned embodiment.

In concluding the detailed description, those skilled in the art will appreciate that many variations and modifications can be made to the exemplary embodiments without substantially departing from the principles of the present invention. Therefore, the disclosed preferred embodiments of the invention are used in a generic and descriptive sense only and not for purposes of limitation.