Patent Publication Number: US-11662073-B2

Title: Lamp for vehicle with different lenses

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application claims the benefits of priorities to Korean Patent Application Nos. 10-2020-0173769 and 10-2020-0173770, filed in the Korean Intellectual Property Office on Dec. 11, 2020, the entire contents of which are incorporated herein by reference. 
     TECHNICAL FIELD 
     The present disclosure relates to a lamp for a vehicle, and more particularly, to a lamp for a vehicle that satisfies rules and performances for implementing a low beam pattern. 
     BACKGROUND 
     In general, a vehicle is equipped with various kinds of lamps having a lighting function for allowing a user to easily identify an object located around a vehicle during nighttime driving and a signal function for informing other vehicles or road users of a driving state of the vehicle. 
     For example, the vehicle includes headlamps and fog lamps (headlights or front lamps) that mainly perform a lighting function, and turn signal lamps, tail lamps, brake lamps, and side markers that mainly perform a signal function, installation references and standards of the lamps for vehicles are ruled by laws such that the lamps sufficiently show their functions. 
     Among the headlamps, a projection optical system for making the lamp itself as a unit is applied to a projection headlamp. 
       FIG.  10    illustrates a lamp  1  for a vehicle that implements a low beam by using a conventional protection optical system. 
     Referring to  FIG.  10   , the conventional lamp for a vehicle includes a light source  2 , a reflector  3  having a reflection surface that reflects light irradiated from the light source, a shield  4  that shields a portion of the light reflected by the reflector, and an aspheric lens  5  that transmits and outputs the irradiated light. The light generated by the light source  2  is reflected by the reflector  3 , and the reflected light passes through the aspheric lens  5 . 
     However, because the conventional lamp for a vehicle that uses the projection optical system forms a light distributing pattern by applying an aspheric lens having a single focus, the rules for implementing a low beam or a high beam may not be satisfied due to a small horizontal diffusion angle. 
     Furthermore, in the conventional lamp for a vehicle using the projection optical system, light may be primarily lost in a process of reflecting the light from the light source  2  to the reflector  3 . Furthermore, in recent years, because the light reflected by the reflector  3  has failed to be input to the aspheric lens  6  while a height of the lens is reduced due to slimness, the light may be secondarily lost (see a dotted line of  FIG.  10   ). 
     The optical efficiency of the conventional lamp for a vehicle using the projection optical system decreases, and thus, optical performance decreases. Accordingly, it is necessary to improve a structure of a lamp for a vehicle to minimize loss of light while satisfying rules and performances. 
     SUMMARY 
     The present disclosure has been made to solve the above-mentioned problems occurring in the prior art while advantages achieved by the prior art are maintained intact. 
     An aspect of the present disclosure provides a lamp for a vehicle that realizes a beam pattern that is dispersed horizontally to satisfy all of rules and performances for implementing a low beam pattern. 
     Another aspect of the present disclosure provides a lamp for a vehicle that forms a cutoff line without providing a separate shield member by modifying a shape of a lens structure. 
     Another aspect of the present disclosure provides a lamp for a vehicle that may minimize loss of light that occurs in an optical system and may compensate for optical efficiency even when a height of tan output surface is decreased. 
     The technical problems to be solved by the present disclosure are not limited to the aforementioned problems, and any other technical problems not mentioned herein will be clearly understood from the following description by those skilled in the art to which the present disclosure pertains. 
     According to an aspect of the present disclosure, a lamp for a vehicle includes a first lamp module including a first light source part, and a first lens structure that forms a first light distribution pattern with light irradiated from the first light source part, and a second lamp module including a second light source part, and a second lens structure that forms a second light distribution pattern having characteristics that are different from those of the first light distribution pattern with light irradiated from the second light source part, the first light distribution pattern and the second light distribution pattern overlap each other to form a low beam pattern, and shapes of input surfaces of the first lens structure and the second lens structure, to which the light is input, are different. 
     The first lens structure may include a first body part disposed on a front side of the first light source part, a first input surface provided on a surface of the first body part, to which the light is input, such that the light irradiated from the first light source part is input to the first body part, and a first output surface provided on a surface of the first body part, from which the light is output, such that the light input to the first body part is output to a front side of the first body part, and a horizontal shape of the first input surface, which is viewed from an upper side, and a vertical shape of the first input surface, which is viewed from a lateral side, may be convexly curved in a direction that faces the first light source part. 
     The first body part may include a first recessed part having a shape that is curved toward a middle area of the first body part in an upward/downward direction. 
     The first recessed part may shield the light that is output from the first light source part and reaches the first recessed part. 
     The first recessed part may include a first shielding layer formed on a surface of the first recessed part, and that shields a portion of the light input to the first body part, and a first cutoff edge formed at an upper end of the first recessed part, and that forms a cutoff line of the lower beam pattern. 
     The first shielding layer may extend to be further inclined downwards in a direction that faces the first light source part as it goes from the first cutoff edge to a lower side, and may shield the light input to a lower end of the first cutoff edge. 
     The first recessed part may include a first surface provided adjacent to the first input surface, and a second surface extending from the first surface and provided adjacent to the first output surface, the first shielding layer may be formed on the first surface, and the first cutoff edge may be formed in an area, in which the first surface and the second surface meet each other. 
     An upward/downward size of the first input surface may be larger than or equal to an upward/downward size of the first output surface. 
     The second lens structure may include a second body part disposed on a front side of the second light source part, a second input surface provided on a surface of the second body part, to which the light is input, such that the light irradiated from the second light source part is input to the second body part, and a second output surface provided on a surface of the second body part, from which the light is output, such that the light input to the second body part is output to a front side of the second body part, and a horizontal shape of the second input surface, which is viewed from an upper side, may be concavely curved in a direction that is opposite to a direction that faces the second light source part, or is flat, and a vertical shape of the second input surface, which is viewed from a lateral side, may be convexly curved in the direction that faces the second light source part. 
     The second body part may include a second recessed part having a shape that is curved toward a middle area of the second body part in an upward/downward direction. 
     The second recessed part may shield the light that is output from the second light source part and reaches the second recessed part. 
     The second recessed part may include a second shielding layer formed on a surface of the second recessed part, and that shields a portion of the light input to the second body part, and a second cutoff edge formed at an upper end of the second recessed part, and that forms a cutoff line of the lower beam pattern. 
     The second shielding layer may extend to be further inclined downwards in a direction that faces the second light source part as it goes from the second cutoff edge to a lower side, and may shield the light input to a lower end of the second cutoff edge. 
     The second recessed part may include a third surface provided adjacent to the second input surface, and a fourth surface extending from the third surface and provided adjacent to the second output surface, the second shielding layer may be formed on the third surface, and the second cutoff edge may be formed in an area, in which the third surface and the fourth surface meet each other. 
     An upward/downward size of the second input surface may be larger than or equal to an upward/downward size of the second output surface. 
     A plurality of first lamp modules and a plurality of second modules may be provided. 
     The plurality of first lamp modules and the plurality of second lamp modules may be alternately disposed along one direction. 
     The first light source part may include a first light source that generates light, and a first collimator provided on a front side of the first light source, and that converts the light radiated from the first light source to parallel light that is parallel to an optical axis of the first lens structure to input the parallel light to the first lens structure. 
     The second light source part may include a second light source that generates light, and a second collimator provided on a front side of the second light source, and that converts the light radiated from the second light source to parallel light that is parallel to an optical axis of the second lens structure to input the parallel light to the second lens structure. 
     According to another aspect of the present disclosure, a lamp for a vehicle may include a light source part that irradiates light, and a lens structure disposed on a front side of the light source part, and that transmits the light irradiated from the light source part to form a specific beam pattern, the lens structure includes body part, an input surface formed on a surface of the body part, to which the light is input, and that inputs the light irradiated from the light source part to the body part, and an output surface formed on a surface of the body part, from which the light is output, and that outputs the light input to the body part to a front side, and the body part may include a recessed part having a shape that is recessed toward a middle area of the body part in an upward/downward direction, and the recessed part may shield the light that is output from the light source part and reaches the recessed part. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The above and other objects, features and advantages of the present disclosure will be more apparent from the following detailed description taken in conjunction with the accompanying drawings: 
         FIG.  1    is a top view illustrating a lamp for a vehicle according to an embodiment of the present disclosure; 
         FIG.  2    is a perspective view of a first lamp module according to an embodiment of the present disclosure; 
         FIG.  3    is a top view of the first lamp module according to an embodiment of the present disclosure; 
         FIG.  4    is a side view of the first lamp module according to an embodiment of the present disclosure; 
         FIG.  5    is a perspective view of a second lamp module according to an embodiment of the present disclosure; 
         FIG.  6    is a top view of the second lamp module according to an embodiment of the present disclosure; 
         FIG.  7    is a side view of the second lamp module according to an embodiment of the present disclosure; 
         FIG.  8    is a view illustrating a light distribution pattern of the first lamp module according to an embodiment of the present disclosure; 
         FIG.  9    is a view illustrating a light distribution pattern of the second lamp module according to an embodiment of the present disclosure; and 
         FIG.  10    is a view schematically illustrating a configuration of a lamp for a vehicle according to the related art. 
     
    
    
     DETAILED DESCRIPTION 
     Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. 
     First, the embodiments described herein are embodiments that are suitable for understanding the technical features of a lamp for a vehicle according to the present disclosure. However, the present disclosure is not limited to the embodiment described below or the technical features of the present disclosure are not limited by the described embodiments, and the present disclosure may be variously modified without departing from the technical scope of the present disclosure. 
       FIG.  1    is a top view illustrating a lamp for a vehicle according to an embodiment of the present disclosure.  FIG.  2    is a perspective view of a first lamp module according to an embodiment of the present disclosure.  FIG.  3    is a top view of the first lamp module according to an embodiment of the present disclosure.  FIG.  4    is a side view of the first lamp module according to an embodiment of the present disclosure. 
       FIG.  5    is a perspective view of a second lamp module according to an embodiment of the present disclosure.  FIG.  6    is a top view of the second lamp module according to an embodiment of the present disclosure.  FIG.  7    is a side view of the second lamp module according to an embodiment of the present disclosure.  FIG.  8    is a view illustrating a light distribution pattern of the first lamp module according to an embodiment of the present disclosure.  FIG.  9    is a view illustrating a light distribution pattern of the second lamp module according to an embodiment of the present disclosure. 
     Referring to  FIGS.  1  to  7   , a lamp  10  for a vehicle according to an embodiment of the present disclosure includes a first lamp module  100  and a second lamp module  200 . 
     The first lamp module  100  includes a first light source part  110  and a first lens structure  150 . 
     The first light source part  110  is configured to generate and irradiate light. Here, various elements or devices that may emit light may be used for the first light source part  110 . The first light source part  110  may include a first light source  111  that generates light, and the first light source  111 , for example, may be a light emitting diode (hereinafter, referred to as an LED). However, the first light source  111  is not limited to an LED. 
     For example, the first light source part  110  may be configured to irradiate parallel light to a front side that faces the first lens structure  150 . In detail, the first light source part  110  may further include a first collimator  113 . The first collimator  113  may be provided in a direction that faces the first lens structure  150  of the first light source  111 , and may be configured to convert the light radiated from the first light source  111  to parallel light that is parallel to an optical axis AX of the first lens structure  150  and input the parallel light to the first lens structure  150 . 
     The first lens structure  150  forms a first light distribution pattern with the light irradiated from the first light source part  110 . 
     In detail, the first lens structure  150  may be disposed on a front side of the first light source part  110 , and may be configured to transmit the light irradiated from the first light source part  110  to form the first light distribution pattern. For example, the first lamp module  100  may include a first base  101 , in which the first light source part  110  and the first lens structure  150  are installed. Hereinafter, a direction, in which the light is irradiated, and which faces the first lens structure  150  from the first light source  111 , will be referred to as a front side, and an opposite direction to the front side will be a rear side, for convenience of description. 
     The first lens structure  150  may include a first body part  160 , a first input surface  180 , and a first output surface  190 . 
     The first body part  160  forms a body of the first lens structure  150 , and may be formed of a material that transmits the input light. The first body part  160  may be disposed on a front side of the first light source part  110 . 
     The first input surface  180  may be provided on a surface of the first body part  160  such that the light irradiated from the first light source part  110  is input to the first body part  160 . Furthermore, the first output surface  190  may be provided on a surface of the first body part  160 , from which the light is output, such that the light input to the first body part  160  is output to a front side of the first body part  160 . 
     In detail, the first body part  160 , the first input surface  180 , and the first output surface  190  may be integrally formed, the first input surface  180  may be formed on a surface of the first body part  160 , which faces the rear side, and the first output surface  190  may be formed on a surface of the first body part  160 , which faces the front side. The first input surface  180  may be configured to condense the light irradiated from the first light source part  110  to an interior of the first body part  160 . 
     The first output surface  190  may be configured to output the light that passes through the first body part  160  of the first lens structure  150  to the front side. For example, the first output surface  190  may be formed to be curved toward the front side, and may be provided in a form of a aspheric surface. However, the first output surface  190  is not limited to the form of an aspheric lens, but various forms of lenses may be applied. As an example, the first output surface  190  may be provided in a form of a Fresnel lens that may decrease thickness for a degree of freedom of design. 
     Here, an optical axis AX of the first output surface  190  and an optical axis of the first input surface  180  may be the same. In an embodiment of the present disclosure, an optical axis AX of the first lens structure  150  means the optical axis AX of the first output surface  190  or the first input surface  180 . 
     The light radiated from the first light source  111  may be converted to the parallel light through the first collimator  113  to be input to the first input surface  180 , and the input light may be condensed in the interior of the first body part  160  by the first input surface  180 . In detail, the first input surface  180  may condense the light input from the first light source part  110  to a vicinity of a focus of the first output surface  190 . Here, the first light source  111 , the first collimator  113 , and the first lens structure  150  may be arranged along a direction of the optical axis AX of the lens structure  150 . 
     The second lamp module  200  includes a second light source part  210  and a second lens structure  250 . 
     The second light source part  210  is configured to generate and irradiate light. Here, various elements or devices that may emit light may be used for the second light source part  210 . The second light source part  210  may include a second light source  211  that generates light, and the second light source  211 , for example, may be an LED but the second light source  211  is not limited to an LED. 
     For example, the second light source part  210  may be configured to irradiate parallel light to a front side that faces the second lens structure  250 . In detail, the second light source part  210  may further include a second collimator  213 . The second collimator  213  may be provided in a direction that faces the second lens structure  250  of the second light source  211 , and may be configured to convert the light radiated from the second light source  211  to parallel light that is parallel to an optical axis AX of the second lens structure  250  and input the parallel light to the second lens structure  250 . 
     The second lens structure  250  forms a second light distribution pattern having characteristics that are different from those of the first light distribution pattern with the light irradiated from the first light source part  210 . 
     In detail, the second lens structure  250  may be disposed on a front side of the second light source part  210 , and may be configured to transmit the light irradiated from the second light source part  210  to form the second light distribution pattern. For example, the second lamp module  200  may include a second base  201 , in which the second light source part  210  and the second lens structure  250  are installed. Hereinafter, a direction, in which the light is irradiated, and which faces the second lens structure  250  from the second light source  211 , will be referred to as a front side, and an opposite direction to the front side will be a rear side, for convenience of description. 
     The second lens structure  250  may include a second body part  260 , a second input surface  280 , and a second output surface  290 . 
     The second body part  260  forms a body of the second lens structure  250 , and may be formed of a material that transmits the input light. The second body part  260  may be disposed on a front side of the second light source part  210 . 
     The second input surface  280  may be provided on a surface of the second body part  260  such that the light irradiated from the second light source part  210  is input to the second body part  260 . Furthermore, the second output surface  290  may be provided on a surface of the second body part  260 , from which the light is output, such that the light input to the second body part  260  is output to a front side of the second body part  260 . 
     In detail, the second body part  260 , the second input surface  280 , and the second output surface  290  may be integrally formed, the second input surface  280  may be formed on a surface of the second body part  260 , which faces the rear side, and the second output surface  290  may be formed on a surface of the second body part  260 , which faces the front side. The second input surface  280  may be configured to condense the light irradiated from the second light source part  210  to an interior of the second body part  260 . Here, a shape and a lens form of the second output surface  290  may be the same as those of the first output surface  190 . 
     The first light distribution pattern and the second light distribution pattern may have different characteristics. Furthermore, the first light distribution pattern and the second light distribution pattern may overlap each other to form a low beam pattern. 
     Here, an aspect that the first light distribution pattern and the second light distribution pattern have different characteristic means that the pattern images of the light transmitted by the first lens structure  150  and the second lens structure  250  are different. For example, this may be implemented by a difference between the shapes of the first lens structure  150  and the second lens structure  250 . 
     For example, the first light distribution pattern formed by the first light sources  150  may be a light distribution pattern (a hot zone) for securing a field of view of a central area of a front side (see  FIG.  8   ). Furthermore, the second light distribution pattern formed by the second light sources  250  may be a light distribution pattern (a wide zone) for securing a field of view of a peripheral area of a front side and a visibility during rotation (see  FIG.  9   ). Furthermore, the first light distribution pattern and the second light distribution pattern may form the low beam pattern that is a pattern that projected to the front side to be integrated. 
     Shapes of the input surfaces of the first lens structure  150  and the second lens structure  250 , to which the light is input, may be different. That is, the first input surface  180  and the second input surface  280  may have different shapes. 
     A horizontal shape of the first input surface  180 , which is viewed from an upper side, and a vertical shape of the first input surface, which is viewed from a lateral side, may have shapes that are convexly curved in a direction that toward the first light source part  110 . That is, both of the horizontal shape and the vertical shape of the first input surface  180  may be convex toward the first light source part  110 . 
     Because the horizontal shape of the first input surface  180  is convex, the horizontal light input to the first input surface  180  may be condensed to the interior of the first body part  160 . Because the vertical shape of the first input surface  180  is convex, the vertical light input to the first input surface  180  may be condensed to the interior of the first body part  160 . 
     In this way, because the first input surface  180  is configured to condense the horizontal light and the vertical light irradiated from the first light source part  110  to the first body part  160  maximally, loss of the light may be minimized, and thus optical efficiency may be increased. The first lamp module  100  may effectively form the first light distribution pattern (the hot zone) that is advantageous in far-distance irradiation for securing a field of view of a central area. 
     A horizontal shape of the second input surface  280 , which is viewed from an upper side, may be formed to have a shape that is concavely curved in a direction that is opposite to a direction that faces the second light source part  210 , or to be flat, and a vertical shape of the second input surface, which is viewed from a lateral side, may have a shape that is convexly curved in the direction that faces the second light source part  210 . The second input surface  280  may be formed such that a magnification in a horizontal direction and a magnification in a vertical direction may be different in an anamorphic lens. 
     Because the horizontal shape of the second input surface  280  may have a concave or flat shape, the horizontal light input to the second input surface  280  may diverge. Meanwhile, because the vertical shape of the second input surface  280  is convex, the vertical light input to the second input surface  280  may be condensed to the interior of the first body part  160 . 
     In this way, because the second input surface  280  is configured to condense the vertical light irradiated from the second light source part  210  to the interior of the first body part  160  and disperse the horizontal light, the light output through the second lens structure  250  may form a light pattern that spreads out horizontally widely. Accordingly, the second lamp module  200  may effectively form the second light distribution pattern (the wide zone) that is advantageous for securing visibility for a peripheral area of a front side and visibility during turning. 
     As an example, both of the first input surface  180  and the second input surface  280  have the same shape (for example, a convex shape), it is advantageous for light condensing and may minimize loss of light, but a horizontal diffusion angle of the light output through the lamp may be formed narrowly. Conditions of the beam pattern are ruled such that the lamp  10  for a vehicle may sufficiently show the functions, and when both of the first input surface  180  and the second input surface  280  have the same shape, this may fail to satisfy the rules that define diffusion angle conditions of a low beam pattern defined by the rules. 
     To solve the problem, in the embodiment of the present disclosure, the light input to the second input surface  280  is diffused horizontally by forming the horizontal shape of the second input surface  280  in a concave or flat shape, whereby all the rules and performance for implementing the low beam pattern may be satisfied. 
     Meanwhile, the first body part  160  may include a first recessed part  170  having a shape that is curved toward a middle area of the first body part  160  in an upward/downward direction. The first recessed part  170  may be configured to shield the light that is output from the first light source part  110  and reaches the first recessed part  170 . 
     In detail, the first recessed part  170  may have a shape that is recessed toward the middle area from the lower surface of the first body part  160 . Then, the first recessed part  170  may be disposed on a path, along which the light input to the first body part  160  travels. Furthermore, the first recessed part  170  may be configured to shield a portion of the light. 
     In detail, according to the lamp  10  for a vehicle according to the embodiment of the present disclosure, a focus of the first output surface  190  may be located in the first body part  160  of the first lens structure  150 , and the first recessed part  170  may be formed at a location corresponding to the focus of the first output surface  190 . Accordingly, the first recessed part  170  may shield a portion of the light at the location corresponding to the focus of the first output surface  190 . 
     According to the present disclosure, because a portion of the light is shielded by the first recessed part  170 , the light output from the first output surface  190  may form a cutoff line of the lower beam pattern. That is, according to the present disclosure, because the first recessed part  170  is formed by modifying the shape of the first body part  160  to form a cutoff line in a structure for minimizing loss of light, the cutoff line may be formed without providing a separate shield member. 
     The first body part  160  may include an upper surface that connects the first input surface  180  and the first output surface  190 , a lower surface disposed to face the upper surface, a side surface disposed between the upper surface and the lower surface. Here, total reflection of the light output from the first light source  111  may not occur on the upper surface, the lower surface, and the side surface of the first body part  160 . 
     The first recessed part  170  may be recessed toward a central portion of the first body part  160  in a partial area of a lower surface thereof. In more detail, the first recessed part  170  may include a first surface  171  provided adjacent to the first input surface  180 , and a second surface  174  that is bent from the first surface  171  at a specific angle and is adjacent to the first output surface  190 . 
     Here, an inclination of the second surface  174  may be steeper than an inclination of the first surface  171 . As an example, the first surface  171  may be inclined upwards on the lower surface, and the second surface  174  may extend from an upper end of the first surface  171  in a vertical direction toward a lower side. However, the shapes of the first surface  171  and the second surface  174  are not limited to the above-described ones. 
     The first recessed part  170  may include a first shielding layer  172  and a first cutoff edge  173 . 
     The first shielding layer  172  may be formed on a surface of the first recessed part  170 , and may be configured to shield a portion of the light input to the first body part  160 . Furthermore, the first cutoff edge  173  may be formed at an upper end of the first recessed part  170 , and may be configured to form a cutoff line of the lower beam pattern. 
     In detail, the first shielding layer  172  may be formed on the first surface  171 . Furthermore, the first shielding layer  172  may extend to be inclined downwards in a direction that faces the first light source part  110  as it goes from the first cutoff edge  173  to the lower side, and may be configured to shield the light input to a lower end of the first cutoff edge  173 . 
     For example, the first shielding layer  172  may be formed on the first surface  171  through deposition, and the first shielding layer  172  may be formed of various materials that may shield light. As an example, the first shielding layer  172  may be formed through deposition of aluminum such that the light is reflected on the first surface  171 . The second surface  174  is a part for connecting the upper end of the first surface  171  and the lower surface that is adjacent to the first output surface  190 . 
     However, the material and forming method of the first shielding layer  172  are not limited to the above-described ones, and various materials and schemes may be applied as long as the first shielding layer  172  may shield light. 
     The first cutoff edge  173  is formed at an upper end of the first shielding layer  172 , and is configured to form the cutoff line of the lower beam pattern. 
     In detail, the first cutoff edge  173  may be provided at a location corresponding to the focus of the first output surface  190 . As an example, the first cutoff edge  173  may on the focus of the first output surface  190 . In detail, the first cutoff edge  173  may be formed in an area, in which the first surface  171  and the second surface  174  meet each other. Here, the shape of the first cutoff edge  173  is not limited, and may be variously determined according to a design specification for forming the low beam pattern. 
     In this way, the lamp  10  for a vehicle according to the embodiment of the present disclosure may form the cutoff line without providing a separate shield member by modifying the shape of the first body part  160  provided in the first lens structure  150  to form the first recessed part  170 . 
     Meanwhile, an upward/downward size of the first input surface  180  may be larger than or equal to an upward/downward size of the first output surface  190 . 
     In detail, the first output surface  190  is a portion exposed to the outside and thus the size of the first output surface  190  is limited by a design or the rules of the lamp, but the first input surface  180  is disposed inside the vehicle body and is not exposed to the outside, and thus the relative size of the first input surface  180  is not limited. Accordingly, the size of the first input surface  180  may be the same as or equal to that of the first output surface  190 . Accordingly, the light irradiated from the first light source part  110  may be maximally condensed to minimize loss of light. 
     To implement the shape, for example, referring to  FIG.  4   , the upper surface of the first body part  160  may be inclined downward to the front side. Furthermore, the lower surface may be formed horizontally or inclined downwards to the front side, and may be inclined less or may be inclined upwards to the front side. 
     Meanwhile, the first body part  260  may include a second recessed part  270  having a shape that is curved toward a middle area of the second body part  260  in an upward/downward direction. The second recessed part  270  may be configured to shield the light that is output from the second light source part  210  and reaches the second recessed part  270 . The second recessed part  270  may have the same shape as that of the first recessed part  170 , or may be modified within a specific range according to a design specification. 
     In detail, the second recessed part  270  may have a shape that is recessed toward the middle area from the lower surface of the second body part  260 . Then, the second recessed part  270  may be disposed on a path, along which the light input to the second body part  260  travels. For example, the second recessed part  270  may be formed in a middle area of the second body part  260 , and may shield a portion of the light at a location corresponding to the focus of the second output surface  290 . 
     In detail, according to the lamp  10  for a vehicle according to the embodiment of the present disclosure, a focus of the second output surface  290  may be located in the second body part  260  of the second lens structure  250 , and the second recessed part  270  may be formed at a location corresponding to the focus of the second output surface  290 . Accordingly, the second recessed part  270  may shield a portion of the light at the location corresponding to the focus of the second output surface  290 . 
     According to the present disclosure, because a portion of the light is shielded by the second recessed part  270 , the light output from the second output surface  290  may form a cutoff line of the lower beam pattern. Accordingly, the present disclosure may form the cutoff line without providing a separate shield member. 
     The second body part  260  may include an upper surface that connects the second input surface  280  and the second output surface  290 , a lower surface disposed to face the upper surface, a side surface disposed between the upper surface and the lower surface. Here, total reflection of the light output from the first light source  211  may not occur on the upper surface, the lower surface, and the side surface of the second body part  260 . 
     The second recessed part  270  may be recessed toward a central portion of the second body part  260  in a partial area of a lower surface thereof. In more detail, the second recessed part  270  may include a third surface  271  provided adjacent to the second input surface  280 , and a fourth surface  274  that is bent from the third surface  271  at a specific angle and is adjacent to the second output surface  290 . 
     Here, an inclination of the fourth surface  274  may be steeper than an inclination of the third surface  271 . As an example, the third surface  271  may be inclined upwards on the lower surface, and the fourth surface  274  may extend from an upper end of the third surface  271  in a vertical direction toward a lower side. However, the shapes of the third surface  271  and the fourth surface  274  are not limited to the above-described ones. 
     The second recessed part  270  may include a second shielding layer  272  and a second cutoff edge  273 . 
     The second shielding layer  272  may be formed on a surface of the second recessed part  270 , and may be configured to shield a portion of the light input to the second body part  260 . Furthermore, the second cutoff edge  273  may be formed at an upper end of the second recessed part  270 , and may be configured to form a cutoff line of the lower beam pattern. 
     In detail, the second shielding layer  272  may be formed on the third surface  271 . Furthermore, the second shielding layer  272  may extend to be inclined downwards in a direction that faces the second light source part  210  as it goes from the second cutoff edge  273  to the lower side, and may be configured to shield the light input to a lower end of the second cutoff edge  273 . 
     For example, the second shielding layer  272  may be formed on the third surface  271  through deposition, and the second shielding layer  272  may be formed of various materials that may shield light. As an example, the second shielding layer  272  may be formed through deposition of aluminum such that the light is reflected on the third surface  271 . 
     The second cutoff edge  273  is formed at an upper end of the second shielding layer  272 , and is configured to form the cutoff line of the lower beam pattern. 
     In detail, the second cutoff edge  273  may be provided at a location corresponding to the focus of the second output surface  290 . As an example, the second cutoff edge  273  may on the focus of the second output surface  290 . In detail, the second cutoff edge  273  may be formed in an area, in which the third surface  271  and the fourth surface  274  meet each other. Here, the shape of the second cutoff edge  273  is not limited, and may be variously determined according to a design specification for forming the low beam pattern. 
     In this way, to the embodiment of the present disclosure may form the cutoff line without providing a separate shield member by modifying the shape of the second body part  260  provided in the second lens structure  250  to form the second recessed part  270 . 
     Meanwhile, an upward/downward size of the second input surface  280  may be larger than or equal to an upward/downward size of the second output surface  290 . Accordingly, the light irradiated from the second light source part  210  may be maximally condensed to minimize loss of light. 
     As described above, because the first lamp module  100  and the second lamp module  200  according to the embodiment of the present disclosure are designed such that a light waveguide path is disposed in the optical axis AX and a reflector is deleted, loss of light in the optical system may be minimized. Furthermore, according to the embodiment of the present disclosure, even when a height of the first output surface  190  or the second output surface  290  is decreased for slimness of the lamp, lowering of the optical efficiency may be prevented. 
     In detail, conventionally, because the lamp  10  for a vehicle has a structure, in which light is reflected through a reflector and is input to a lens, light may be lost in a process of reflecting light from a light source to the reflector, and the light may be lost by the light that fails to be input to the lens according to an incident angle of the reflected light. In the lamp  10  for a vehicle according to the present disclosure, because the light waveguide path is disposed in the optical axis AX and the reflector is deleted as well, optical efficiency may be enhanced by solving the problem. 
     Meanwhile, referring to  FIG.  1   , a plurality of first lamp modules  100  and a plurality of second lamp modules  200  may be provided. Here, the numbers of the first lamp modules  100  and the second lamp modules  200  are not limited to the illustrated embodiment, but may be variously modified according to a condition and a design specification required by the applied vehicle. 
     Furthermore, the plurality of first lamp modules  100  and the plurality of second lamp modules  200  may be alternately disposed along one direction. For example, the first lamp modules  100  and the second lamp modules  200  may be alternately disposed one by one, and as an example, may be arranged in a horizontal direction that is parallel to a ground surface. 
     However, the arrangement of the first lamp modules  100  and the second lamp modules  200  is not limited to the above-described one, and two or more first lamp modules  100  and adjacent two or more second lamp modules  200  may be alternately disposed, and may be arranged in various directions, such as upward, downward, leftward, and rightward directions. 
     In this way, the present disclosure may implement various images while satisfying the rules and performances by properly combining the first lamp modules  100  and the second lamp modules  200  to implement the low beam pattern. 
     The lamp for a vehicle according to the embodiment of the present disclosure may satisfy all of the rules and performances for implementing the low beam pattern by forming the second input surface such that the horizontal shape of the second input surface is concave or flat to diffuse the light input to the second input surface horizontally. 
     Meanwhile, hereinafter, a lamp for a vehicle according to another aspect of the present disclosure will be described. Hereinafter, for convenience of description, the light source part  110  and the lens structure provided in the lamp  10  for a vehicle according to the another embodiment of the present disclosure are denoted by the same reference numerals as those of the first light source part  110  and the first lens structure  150  provided in the above first lamp module  100 . 
     The lamp  10  for a vehicle according to the present disclosure includes the light source part  110  that irradiates light, and the lens structure  150  that projects the light irradiated from the light source part  110  to form a specific beam pattern. 
     The lens structure  150  includes the body part  160 , the input surface that forms on a surface of the body part  160 , to which the light is input, to input the light irradiated from the light source part  110  to the body part  160 , and the output surface  190  formed on a surface of the body part  180 , to which the light is output to output the light input to the body part  160  to the front side. 
     In addition, the body part  160  may include the recessed part  170  having a shape that is recessed toward a middle area of the body part  160  in the upward/downward direction, and the recessed part  170  may be configured to shield the light that is output from the light source part  110  and reaches the recessed part  170 . 
     The lamp for a vehicle according to the embodiment of the present disclosure may form the cutoff line without providing a separate shield member by modifying the shape of the lens structure to form the recessed part. 
     The lamp for a vehicle according to the embodiment of the present disclosure may minimize loss of light generated in the optical system by disposing the light waveguide path in the optical axis, and may prevent lowering of optical efficiency even when the height of the output surface is decreased for slimness of the lamp. 
     The lamp for a vehicle according to the embodiment of the present disclosure may satisfy all of rules and performances for implementing a low beam pattern by differently forming shapes of the input surfaces of the first lens structure and the second lens structure, to which light is input and diffusing the light input by the second lens structure horizontally. 
     The lamp for a vehicle according to the embodiment of the present disclosure may form the cutoff line without providing a separate shield member by modifying the shape of the lens structure to form the recessed part. 
     The lamp for a vehicle according to the embodiment of the present disclosure may minimize loss of light generated in the optical system by disposing the light waveguide path in the optical axis, and may prevent lowering of optical efficiency even when the height of the output surface is decreased for slimness of the lamp. 
     Although the specific embodiments of the present disclosure have been described until now, the spirit and scope of the present disclosure are not limited to the specific embodiments, and may be variously corrected and modified by an ordinary person in the art, to which the present disclosure pertains, without changing the essence of the present disclosure claimed in the claims.