Lamp for vehicle

Abstract

A lamp for a vehicle includes: a first optical module forming a first light distribution pattern and including a first light source portion and a first output lens portion outputting light input from the first light source portion; and a second optical module forming a second light distribution pattern having a light distribution characteristic different from that of the first light distribution pattern, and including a second light source portion and a second output lens portion outputting light input from the second light source portion. The first optical module and the second optical module are arranged in an upward / downward direction, and the first light distribution pattern and the second light distribution pattern overlap each other to implement low beams. According to the vehicle lamp disclosed by the utility model, the design differentiation is ensured, and thus the competitiveness of a product is increased.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Korean Patent Application No. 10-2023-010797 filed on August 17, 2023 with the Korean Intellectual Property Office, the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present disclosure relates to a lamp for a vehicle. Background Art

[0004] Generally, a vehicle is equipped with various types of lamps having a lighting function for helping to easily identify objects located around the vehicle when driving at night, and a signaling function for notifying other vehicles or road users of the driving state of the vehicle.

[0005] Among vehicle lights, headlights that form a low beam mode or a high beam mode to ensure the driver's forward vision when driving at night play an important role in safe driving. In addition, in recent years, the importance of differentiation in headlight design is increasing.

[0006] In recent years, in order to differentiate the design of a vehicle lamp, a vehicle lamp for realizing a linear illumination image rather than an illumination image in a shape in which a plurality of dots are arranged has been developed.

[0007] However, there are limitations in implementing a linear illumination image using conventional separate optical modules and structures. In particular, when conventional techniques are used, it is difficult to implement an optical system that has a continuous image without intermittent texture under illumination.

[0008] In particular, depending on the optical module that realizes the wide low beam area, it may be difficult to simultaneously realize the light distribution performance and the uniform light emission image of the light output surface. Then, when designing to satisfy the light distribution performance, the light emission image is not uniform, thereby possibly causing a discontinuous texture in the entire area of ​​the output surface of the vehicle lamp. Therefore, it is necessary to improve the technology for enhancing the uniformity of the light emission distribution of the light output surface while satisfying the optical performance. Summary of the invention

[0009] The present disclosure aims to solve the above-mentioned problems occurring in the prior art while maintaining the advantages achieved by the prior art unchanged.

[0010] One aspect of the present disclosure provides a lamp for a vehicle which forms a lighting image having a continuous image with an uninterrupted texture in a lighting state.

[0011] Another aspect of the present disclosure provides a lamp for a vehicle, which ensures differentiation in design and thus increases competitiveness of a product.

[0012] The technical problems to be solved by the present disclosure are not limited to the above-mentioned problems, and those skilled in the art to which the present disclosure belongs will clearly understand any other technical problems not mentioned herein through the following description.

[0013] According to one aspect of the present disclosure, a lamp for a vehicle includes: a first optical module, which forms a first light distribution pattern, and the first optical module includes a first light source part and a first output lens part, the first output lens part outputs light input from the first light source part; and a second optical module, which forms a second light distribution pattern having a light distribution characteristic different from the light distribution characteristic of the first light distribution pattern, and the second optical module includes a second light source part and a second output lens part, the second output lens part outputs light input from the second light source part, the first optical module and the second optical module are arranged in an upward / downward direction, the first light distribution pattern and the second light distribution pattern overlap with each other to achieve low beam, and the distance from the second output lens part to the vertical focus of the second output lens part is less than the distance from the first output lens part to the vertical focus of the first output lens part.

[0014] The first output lens portion may include a first input surface and a first output surface, light is input to the first input surface, and the light is output from the first output surface, the second output lens portion may include a second input surface and a second output surface, light is input to the second input surface, and the light is output from the second output surface, the first output lens portion and the second output lens portion may be integrally formed in an upward / downward direction, and the first output surface and the second output surface may respectively include multi-facet lenses.

[0015] A horizontal focal point of the second output lens section may be formed inside the second output lens section.

[0016] The second input surface may include a plurality of unit input surfaces, which may be arranged in a left / right direction, and in a horizontal cross-section of the second output lens portion, each unit input surface may have a convex (convex) curved shape in a direction facing the second light source portion.

[0017] Multiple cell input surfaces can have the same shape.

[0018] The curvature of the unit input surface may be formed such that an output angle of light output from the second output surface is within a range of 30 degrees to 90 degrees.

[0019] The first optical module may further include a first shielding portion, which is disposed between the first light source portion and the first output lens portion and blocks a portion of the light, and the second optical module may further include a second shielding portion, which is disposed between the second light source portion and the second output lens portion and blocks a portion of the light, and each of the first shielding portion and the second shielding portion may have a shape corresponding to a cut-off line of the low beam.

[0020] The lamp may further include a third optical module that forms a third light distribution pattern, the third optical module including a third light source portion and a third output lens portion, the third output lens portion outputting light input from the third light source portion, the third light distribution pattern may have light distribution characteristics different from those of the first light distribution pattern and the second light distribution pattern and realize high beam, the third optical module may be arranged in an upward / downward direction together with the first optical module and the second optical module, and the third output lens portion may be integrally formed with the first output lens portion and the second output lens portion. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above and other objects, features and advantages of the present disclosure will become more apparent from the following detailed description taken in conjunction with the accompanying drawings:

[0022] Figure 1 is a perspective view showing a vehicle lamp according to an embodiment of the present disclosure;

[0023] Figure 2 A vehicle lamp according to an embodiment of the present disclosure is shown, and a side surface of the vehicle lamp is shown;

[0024] Figure 3 is a side view of a first output lens portion, a second output lens portion, and a third output lens portion when viewed from one side in a leftward / rightward direction according to an embodiment of the present disclosure;

[0025] Figure 4 is a perspective view showing a first optical module and a second optical module according to an embodiment of the present disclosure;

[0026] Figure 5 is a side view of a first optical module and an optical path when viewed from one side in a leftward / rightward direction according to an embodiment of the present disclosure;

[0027] Figure 6 is a side view of a second optical module and an optical path when viewed from one side in a leftward / rightward direction according to an embodiment of the present disclosure;

[0028] Figure 7 A second output lens portion of a second output lens portion according to an embodiment of the present disclosure is shown, and is a view showing a unit input surface and a vertical optical path;

[0029] Figure 8 is a view showing a plan view and an optical path of a first optical module when viewed from the top according to an embodiment of the present disclosure;

[0030] Fig. 9 is a view showing a plan view and an optical path of a second optical module when viewed from the top according to an embodiment of the present disclosure;

[0031] Fig.10 is a plan view of a second output lens portion and a light path through a unit input surface when viewed from the top according to an embodiment of the present disclosure;

[0032] Fig.11 is a view showing a light distribution image (upper side) of a first optical module and a light emitting image (lower side) of a first output lens part according to an embodiment of the present disclosure;

[0033] Fig.12 is a table representing ray tracing, a light distribution image, and a second light emitting surface image according to the second vertical focal length f2;

[0034] Fig.13 is a table representing ray tracing, a second light emitting surface image, and a light distribution image according to the shape of the second input surface;

[0035] Fig.14A is a view showing a light emitting image of a first output surface and a light emitting image of a second output surface according to an embodiment of the present disclosure;

[0036] Fig. 14B is a view showing a light distribution image of a first optical module and a light distribution image of a second optical module according to an embodiment of the present disclosure; and

[0037] Fig. 14C 2 is a view illustrating a road surface pattern image of a first optical module and a second optical module according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0038] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

[0039] First, the embodiments described below are embodiments suitable for helping to understand the technical features of the vehicle lamp according to the present disclosure. However, the present disclosure is neither limited to the application of the embodiments described below, nor is the technical features of the present disclosure limited to the described implementation modes, and various modifications can be made to the present disclosure within the technical scope of the present disclosure.

[0040] Figure 1 is a perspective view showing a vehicle lamp according to an embodiment of the present disclosure; Figure 2 A vehicle lamp according to an embodiment of the present disclosure is shown, and a side surface of the vehicle lamp is shown; Figure 3 is a side view of a first output lens portion, a second output lens portion, and a third output lens portion when viewed from one side in a leftward / rightward direction according to an embodiment of the present disclosure; Figure 4 is a perspective view showing a first optical module and a second optical module according to an embodiment of the present disclosure; Figure 5 is a side view of a first optical module and an optical path when viewed from one side in a leftward / rightward direction according to an embodiment of the present disclosure; Figure 6 is a side view of a second optical module and an optical path when viewed from one side in a leftward / rightward direction according to an embodiment of the present disclosure; Figure 7 A second output lens portion of a second output lens portion according to an embodiment of the present disclosure is shown, and is a view showing a unit input surface and a vertical optical path; Figure 8 is a view showing a plan view and an optical path of a first optical module when viewed from the top according to an embodiment of the present disclosure; Fig. 9 is a view showing a plan view and an optical path of a second optical module when viewed from the top according to an embodiment of the present disclosure; Fig.10 is a plan view of a second output lens portion when viewed from the top and a light path through a unit input surface according to an embodiment of the present disclosure.

[0041] Fig.11 is a view showing a light distribution image (upper side) of a first optical module and a light emitting image (lower side) of a first output lens part according to an embodiment of the present disclosure; Fig.12 is a table representing ray tracing, a light distribution image, and a second light emitting surface image according to the second vertical focal length f2; Fig.13 is a table representing ray tracing, a second light emitting surface image, and a light distribution image according to the shape of the second input surface; Fig.14A is a view showing a light emitting image of a first output surface and a light emitting image of a second output surface according to an embodiment of the present disclosure; Fig. 14B is a view showing a light distribution image of a first optical module and a light distribution image of a second optical module according to an embodiment of the present disclosure; and Fig. 14C 2 is a view illustrating a road surface pattern image of a first optical module and a second optical module according to an embodiment of the present disclosure.

[0042] The vehicle lamp 10 according to an embodiment may be used for the purpose of a lighting function (e.g., a headlamp or a fog lamp), or may be used for the purpose of a signal function (e.g., a turn signal lamp, a tail lamp, a brake lamp, or a side marker), and the present disclosure is not limited or restricted by these purposes. For example, the vehicle lamp 10 according to an embodiment of the present disclosure may be used as a headlamp for a vehicle mounted on the left front side and the right front side of the vehicle. The embodiment of the present disclosure may correspond to a headlamp that is capable of irradiating a low beam, or capable of irradiating a low beam and a high beam simultaneously or individually.

[0043] refer to Figure 1 to Figure 1 4. The vehicle lamp according to the embodiment of the present disclosure includes a first optical module and a second optical module. In addition, the embodiment of the present disclosure may further include a third optical module.

[0044] The embodiments of the present disclosure may include the first optical module 100 and the second optical module 200, or may include all of the first optical module 100, the second optical module 200, and the third optical module 300. Hereinafter, in the illustrated embodiments, an example of the present disclosure including all of the first optical module 100, the second optical module 200, and the third optical module 300 will be described. However, the embodiments of the present disclosure are not limited.

[0045] The first optical module 100 is configured to form a first light distribution pattern, and includes a first light source part 110 and a first output lens part 140, and the first output lens part 140 is configured to output the light input from the first light source part 100. In addition, the second optical module 200 is configured to form a second light distribution pattern having a light distribution characteristic different from the light distribution characteristic of the first light distribution pattern, and includes a second light source part 210 and a second output lens part 240, and the second output lens part 240 is configured to output the light input from the second light source part 210.

[0046] In addition, the third optical module 300 is configured to form a third light distribution pattern, and includes a third light source part 310 and a third output lens part 340 configured to output light input from the third light source part 310 .

[0047] Herein, the first optical module 100, the second optical module 200, and the third optical module 300 may be arranged in an upward / downward direction, and the first output lens part 140, the second output lens part 240, and the third output lens part 340 may be arranged in a downward / upward direction and may be integrally formed. Figures 1 to 9 In the diagram, "V" represents a vertical direction (upward / downward direction) relative to the ground, and "H" represents a horizontal direction (leftward / rightward direction).

[0048] At the same time, the first light distribution pattern and the second light distribution pattern may overlap each other to form a low-beam light distribution pattern. In addition, the third light distribution pattern may be configured to form a high-beam light distribution pattern.

[0049] For example, in the low-beam light distribution pattern, the first light distribution pattern may be a hot-zone light distribution pattern for ensuring the field of view of the central area in front of the vehicle. In addition, in the low-beam light distribution pattern, the second light distribution pattern may be a wide-zone light distribution pattern for ensuring the field of view of the surrounding area in front of the vehicle and ensuring visibility when turning.

[0050] Furthermore, the third light distribution pattern may be a high-beam light distribution pattern, which is a high-beam that irradiates light far to the front side of the vehicle.

[0051] In detail, the first optical module 100 is configured to form a first light distribution pattern, and includes a first light source part 110 , a first output lens part 140 , and a first condensing lens part 120 .

[0052] Various elements or devices capable of emitting light may be used as the first light source part 110. For example, the first light source part 110 may include a light source and a substrate. For example, the light source may be a light emitting diode (hereinafter, referred to as an LED (light emitting diode), and the substrate may be a printed circuit board (PCB). However, the configuration of the first light source part 110 is not limited thereto.

[0053] The first output lens part 140 may be configured to output the light input from the first light source part 110. The first output lens part 140 may be configured to project the light irradiated from the first light source part 110 to form a first light distribution pattern.

[0054] The first condensing lens part 120 may be configured to condense light emitted from the first light source part 110. The light irradiated from the first light source part 110 may be condensed by the first condensing lens part 120, pass through the first output lens part 140, and then be output to the front side.

[0055] The second optical module 200 is configured to form a second light distribution pattern, and includes a second light source part 210 , a second output lens part 240 , and a second condensing lens part 220 .

[0056] The second light source part 210 may include, for example, a light source and a substrate. For example, the light source may be a light emitting diode (hereinafter, referred to as an LED), and the substrate may be a printed circuit board (PCB). However, the configuration of the second light source part 210 is not limited thereto.

[0057] The second output lens part 240 may be configured to output the light input from the second light source part 210. The second output lens part 240 may be configured to form a second light distribution pattern using the light emitted from the second light source part 210.

[0058] The second condensing lens part 220 may be configured to condense light emitted from the second light source part 210. It may be configured to condense light emitted from the second light source part 210. Light irradiated from the second light source part 210 may be condensed by the second condensing lens part 220, pass through the second output lens part 240, and then be output.

[0059] The third optical module 300 is configured to form a third light distribution pattern, and includes a third light source part 310 , a third output lens part 340 , and a third condensing lens part 320 .

[0060] The third light source part 310 may include, for example, a light source and a substrate. For example, the light source may be a light emitting diode (hereinafter, referred to as an LED), and the substrate may be a printed circuit board (PCB). However, the configuration of the third light source part 310 is not limited thereto.

[0061] The third output lens part 340 may be configured to output the light input from the third light source part 310. The third output lens part 340 may be configured to form a third light distribution pattern using the light emitted from the third light source part 310.

[0062] The third condensing lens part 320 may be configured to condense light emitted from the third light source part 310. It is configured to condense light emitted from the third light source part 310. Light irradiated from the third light source part 310 may be condensed by the third condensing lens part 320, pass through the third output lens part 340, and then be output.

[0063] As described above, the first optical module 100, the second optical module 200, and the third optical module 300 may be arranged in the upward / downward direction, and the first output lens part 140, the second output lens part 240, and the third output lens part 340 may be integrally formed in the upward / downward direction.

[0064] The vehicle lamp 10 according to the embodiment of the present disclosure is an optical system extending in the upward / downward direction, and can realize both the high beam light distribution mode and the low beam light distribution mode. According to the present disclosure, the first output lens part 140, the second output lens part 240 and the third output lens part 340 are formed integrally, so in the lighting state, a lighting image of a continuous linear image with no discontinuity can be formed.

[0065] Therefore, according to the embodiments of the present disclosure, the design of the lamp can be differentiated, so that the competitiveness of the product can be improved.

[0066] Meanwhile, the first optical module 100 may further include a first shielding portion 130, which is disposed between the first condensing lens portion 120 and the first output lens portion 140 and is configured to shield a portion of light. In addition, the second optical module 200 may further include a second shielding portion 230, which is disposed between the second condensing lens portion 220 and the second output lens portion 240 and is configured to shield a portion of light.

[0067] The first shielding portion 130 and the second shielding portion 230 may include a stepped cut-off area having a shape corresponding to a cut-off line of a low beam mode.

[0068] In detail, the first shielding portion 130 may include a cutoff region at an upper end thereof, and may be configured to form a cutoff line in the first light distribution pattern by limiting the light irradiated from the first light source portion 110. In addition, the second shielding portion 230 may include a cutoff region at an upper end thereof, and may be configured to form a cutoff line in the second light distribution pattern by limiting the light irradiated from the second light source portion 210.

[0069] Meanwhile, the first optical module 100 may further include a first heat dissipation portion 150. The first light source portion 110 may be mounted on the first heat dissipation portion 150, and the first heat dissipation portion 150 may be configured to dissipate heat generated by the first light source portion 100. The first light source portion 110 may include one or more light sources, and when the number of the light sources is plural, the light sources may be arranged on the front surface of the first heat dissipation portion 150 in an upward / downward direction.

[0070] The second optical module 200 may further include a second heat dissipation portion 250. The second light source portion 210 may be mounted on the second heat dissipation portion 250, and the second heat dissipation portion 250 may be configured to dissipate heat generated by the second light source portion 210. The second light source portion 210 may include one or more light sources, and when the number of the light sources is plural, the light sources may be arranged on the front surface of the second heat dissipation portion 250 in an upward / downward direction.

[0071] The third optical module 300 may further include a third heat dissipation portion 350. The third light source portion 310 may be mounted on the third heat dissipation portion 350, and the third heat dissipation portion 350 may be configured to dissipate heat generated by the third light source portion 310. The third light source portion 310 may include one or more light sources, and when the number of the light sources is plural, the light sources may be arranged on the front surface of the third heat dissipation portion 350 in an upward / downward direction.

[0072] Here, the first heat dissipation part 150, the second heat dissipation part 250 and the third heat dissipation part 350 may be arranged in the upward / downward direction and may be integrally formed. Therefore, the present disclosure may realize an optical system extending in the upward / downward direction to form an illumination image having a longitudinal shape.

[0073] As described above, this can be allowed by the first condensing lens section 120, the second condensing lens section 220, and the third condensing lens section 320 that condense the light irradiated to the front side. For example, when the scheme of converging the light irradiated from the light source and directing the light to the front side is a conventional technology using an elliptical reflecting surface, the light source does not irradiate the light to the front side but irradiates the light to the upper side, etc., and in this case, the first light source section, the second light source section, and the heat dissipation member (in which the second light source section is installed) cannot adopt a heat sink having a longitudinally long shape.

[0074] The present disclosure includes first, second, and third condensing lens parts 120, 220, and 320, which simultaneously perform functions of a refractive lens and a condensing lens and can condense light irradiated from a light source to the front side of a carline and direct the light to the front side.

[0075] Therefore, according to the present disclosure, as shown, such a type can be applied in which the first heat dissipation portion 150, the second heat dissipation portion 250, and the third heat dissipation portion 350 extend in the upward / downward direction and are integrally formed. In addition, the heat dissipation fins provided in the first heat dissipation portion 150, the second heat dissipation portion 250, and the third heat dissipation portion 350 can be designed in the direction of the vehicle line. Here, the vehicle line refers to the forward / rearward line of the vehicle relative to the driving direction of the vehicle.

[0076] However, the present disclosure is not limited to the case where the first heat dissipation portion 150, the second heat dissipation portion 250, and the third heat dissipation portion 350 are integrally formed, and the first heat dissipation portion 150, the second heat dissipation portion 250, and the third heat dissipation portion 350 may be arranged in the longitudinal direction after being separately formed and assembled (see Figure 2 ).

[0077] The first output lens portion 140 may include: a first input surface 141 into which light is input; and a first output surface 143 from which light is output, the second output lens portion 240 may include: a second input surface 241 into which light is input; and a second output surface 243 from which light is output, and the third output lens portion 340 may include: a third input surface 341 into which light is input; and a third output surface 343 from which light is output.

[0078] Here, the first output surface 143, the second output surface 243, and the third output surface 343 may be multi-facet lenses (MFS). Therefore, the vehicle lamp 10 may improve light diffusion efficiency and achieve surface luminescence.

[0079] In addition, the first output surface 143 , the second output surface 243 , and the third output surface 343 may have corresponding shapes.

[0080] In detail, a plurality of first optical modules 100, a plurality of second optical modules 200, and a plurality of third optical modules 300 may be provided. Figure 3 In the illustrated embodiment, two first optical modules 100 and two second optical modules 200 are provided, and four third optical modules 300 are provided, and the first output lens part 140, the second output lens part 240 and the third output lens part 340 may be formed such that eight lenses are integrally formed.

[0081] Then, when the first output surface 143, the second output surface 243, and the third output surface 343 all have different shapes, when the light is turned off, a different texture of the module may be felt, and when the light is turned on, a discontinuous texture may appear.

[0082] Therefore, according to an embodiment of the present disclosure, the first output surface 143, the second output surface 243, and the third output surface 343 may have corresponding shapes. Here, the aspect that the first output surface 143, the second output surface 243, and the third output surface 343 have corresponding shapes means that the first output surface 143, the second output surface 243, and the third output surface 343 have the same shape or are formed to have extremely similar shapes, so that a person of ordinary skill in the art to which the present disclosure belongs determines that they have substantially the same shape.

[0083] In this case, when the light is turned on or off, the discontinuous texture between the optical modules can be minimized. In addition, by differently designing the shapes of the first input surface 141, the second input surface 241, and the third input surface 341, light distribution patterns with different light distribution characteristics can be achieved.

[0084] In detail, the first input surface 141 , the second input surface 241 , and the third input surface 341 may have different shapes.

[0085] Therefore, the optical characteristics of the optical module may become different. The difference between the characteristics of the first output lens part 140, the second output lens part 240 and the third output lens part 340 described below (e.g., focus) may be caused by the difference between the shapes of the first input surface 141, the second input surface 241 and the third input surface 341. In addition, the optical performance of the optical module may be different according to the focus positions of the first to third condensing lens parts 120, 220 and 320 and the first to third output lens parts 140, 240 and 340.

[0086] In order to optimize the optical design of the vehicle lamp, the light uniformity of the first to third output surfaces 143, 243 and 343, the distance between modules, etc. may become important factors. However, according to the first optical module 100 and the second optical module 200 forming the low beam, the second output lens part 240 may be difficult to simultaneously satisfy the optical performance and uniformity of the second output surface compared to the first output lens part 140.

[0087] This is because when the distribution of the light source is designed to satisfy the optical performance of a wide area in the second optical module, it becomes difficult to achieve a uniform light emission image in the second output surface. Since the first optical module realizes a hot zone with a small light distribution area, it is easy to satisfy the design of light distribution while ensuring the uniformity of the first output surface (see Fig.11 ), and because the second optical module has a wide light distribution area, it is difficult to design the second output surface to simultaneously meet the light distribution and uniformity requirements (see Fig.12 ).

[0088] In this way, when the light uniformity of the second output surface as the output surface in the lamp in which the output lens portion is integrally formed in the upward / downward direction is insufficient, when the lamp is turned on, the light output surface of the vehicle lamp may have a discontinuous texture, and thus, the competitiveness of the product in design may be weakened. Therefore, it is necessary to improve the technology for enhancing the light distribution uniformity of the second output surface while satisfying the optical performance of the second optical module.

[0089] First, refer to Figures 5 to 8 , a configuration for improving a vertical light emission image of the second output lens part 240 will be described.

[0090] In the present disclosure, a distance f2 from the second output lens part 240 to a vertical focus Fv2 of the second output lens part 240 is smaller than a distance f1 from the first output lens part 140 to a vertical focus Fv1 of the first output lens part 140 (f1>f2).

[0091] For ease of description, the distance from the imaginary reference plane RF1 of the first output lens part 140 to the vertical focus Fv1 of the first output lens part 140 is referred to as the first vertical focal length f1, and the distance from the imaginary reference plane RF2 of the second output lens part 240 to the vertical focus Fv2 of the second output lens part 240 is referred to as the second vertical focal length f2.

[0092] Here, the imaginary reference plane RF1 of the first output lens portion 140 may be a plane obtained by extending a line (string) connecting the upper end and the lower end of the first input surface 141 in a vertical cross section including the center of the first output lens portion 140 in the left / right direction of the first output lens portion 140 (see Figure 5 ). In addition, the imaginary reference plane RF2 of the second output lens portion 240 may be a plane obtained by extending a line connecting the upper end and the lower end of the second input surface 241 in a vertical cross section including the center of the second output lens portion 240 in the leftward / rightward direction of the second output lens portion 240 (see Figure 6 ).

[0093] When the second vertical focal length f2 is designed to be shorter, the distribution of light input to the second input surface 241 can become wider and more uniform. In this case, a uniform light emission image can be achieved because the light output from the second output surface 243 is also uniformly emitted from the second output surface 243.

[0094] Therefore, the embodiments of the present disclosure can supplement the uniformity of the second output surface 243 by designing the second vertical focal length f2 so that the second vertical focal length f2 is shorter than the first vertical focal length f1, thereby achieving a continuous light-emitting image without discontinuity between the first output surface 143 and the second output surface 243.

[0095] Here, considering both performance and light distribution image, the range of the second vertical focal length f2 can be considered as a suitable range compared with the first vertical focal length f1. That is, the second vertical focal length f2 needs to be designed so that the second vertical focal length f2 is shorter than the first vertical focal length f1, and the light distribution image is uniform while satisfying the performance for realizing a wide area of ​​low beam.

[0096] Fig.12is a table representing ray tracing, light distribution images, and an image of the second output surface 243 according to the second vertical focal length f2.

[0097] In A1, the second vertical focal length f2 is 25 mm, in A2, the second vertical focal length f2 is 25 mm, in A3, the second vertical focal length f2 is 20 mm, and in A4, the second vertical focal length f2 is 15 mm. In addition, in A1, the light is distributed in the upward direction of the focus to meet the downward distribution of the light distribution image.

[0098] In A1, the light distribution performance is satisfied, but the light emitting image of the second output surface 243 is not uniform, and in A2, where the light is concentrated at the focus, the uniformity of the light emitting image is satisfied, but the light intensity in the lower area of ​​the light distribution image is insufficient, so the performance is not satisfied. In A4, it is determined that the light distribution performance is satisfied, but the uniformity of the light emitting image is insufficient. As a result, it is determined that when the second vertical focal length f2 is 20 mm, the uniformity is satisfied while satisfying the light distribution performance.

[0099] Next, refer to Figure 7 , 9 10, a configuration for improving a horizontal (leftward / rightward) direction light emitting image of the second output lens portion 240 will be described.

[0100] The horizontal focal point F of the second output lens section 240 H 2 can be formed inside the second output lens portion 240 (see Fig.10 ).

[0101] In detail, the second output lens portion 240 may be designed so that the horizontal focus F H 2 is formed between the second input surface 241 and the second output surface 243. A structure may be designed in which light input to the second input surface 241 is diffused after forming a focus inside the second output lens portion 240 with respect to the horizontal direction of the second optical module 200. Due to this structure, the light may be uniformly distributed on the second output surface 243 to achieve a uniform light emission image.

[0102] However, for example, when the focus of the light input to the input surface is formed outside the output surface, the light may be narrowly distributed on the output surface. In detail, the light input to the input surface may be refracted by the curvature of the input surface so that the focus is formed outside in the output direction of the output surface, and in this case, because the light is not diffused on the output surface, the light is narrowly distributed on the output surface. In this case, since the light is not limited by the left / right periphery of the output surface, it is difficult to achieve a uniform light emitting image.

[0103] Therefore, because the horizontal focus FH 2 is formed inside the second output lens part 240, when the light is diffused on the second output surface 243, the second output lens part 240 according to the embodiment of the present disclosure can realize a uniform light emission image.

[0104] In this way, the curvature of the second input surface 241 must be formed small to form a focus inside the second output lens portion 240. In an embodiment of the present disclosure, the second input surface 241 may be implemented by a plurality of unit input surfaces 241a to form an input surface having a small curvature.

[0105] In detail, the second input surface 241 includes a plurality of unit input surfaces 241a, and the plurality of unit input surfaces 241a may be arranged in a leftward / rightward direction. Figure 7 One unit input surface 241a is shown in the perspective view shown.

[0106] In addition, in a horizontal cross-section of the second output lens part 240 , each of the unit input surfaces 241 a may have a curved shape convex in a direction facing the second light source part 210 .

[0107] In detail, the second input surface 241 may include a unit input surface 241 a protruding in a direction facing the second light source part 210 with respect to a horizontal direction, and a plurality of unit input surfaces 241 a may be repeatedly formed in a left / right direction.

[0108] Due to this structure, the lights input to the cell input surface 241a and output through the second output surface 243 may overlap each other. Therefore, since the light is uniformly distributed on the second output surface 243, a uniform light emission image may be achieved.

[0109] For example, refer to Fig. 9 and Fig.10 , the plurality of unit input surfaces 241a may have the same shape. That is, the second input surface 241 may have a structure in which the plurality of unit input surfaces 241a having the same shape are continuous in the left / right direction.

[0110] However, the shape of the second input surface 241 is not limited to the present embodiment, in which the plurality of unit input surfaces 241a have the same shape, and the plurality of unit input surfaces 241a may be formed differently as long as the technical features of the present disclosure can be achieved.

[0111] Meanwhile, the curvature of each unit input surface 241a may be formed so that the output angle (θ) of the light output from the second output surface 243 is within a range of 30 to 90 degrees. In detail, the curvature of each unit input surface 241a may be designed so that the output angle (θ) of the light output after forming a focus inside the second output lens portion 240 is 30 degrees or more (see Fig.10 ).

[0112] In this manner, since the output angle (θ) of the light output from the second output surface 243 is designed to be 30 degrees or more, the light can be diffused more on the second output surface 243. Therefore, the amount of overlap of the light input through the plurality of unit input surfaces 241a can be increased, and thus, a uniform light emission image can be achieved on the second output surface 243.

[0113] Fig.13 is a table representing ray tracing, a light emitting surface of the second output surface 243 , and a light distribution image according to the shape of the second input surface 241 .

[0114] B1 is a comparative example and corresponds to a case where the second input surface includes one input surface, and B2 to B5 illustrate various embodiments of the present disclosure and correspond to a case where the second input surface 241 includes a plurality of unit input surfaces 241 a.

[0115] The radius of curvature of the second input surface of B1 is 10 mm, and the cone constant is -1. B2 corresponds to the case where the second input surface 241 includes five unit input surfaces 241a, and the radius of curvature of the unit input surface 241a is 2 mm and the cone constant is 0. B3 corresponds to the case where the second input surface 241 includes nine unit input surfaces 241a, and the radius of curvature of the unit input surface 241a is 1.2 mm and the cone constant is 0. B4 corresponds to the case where the second input surface 241 includes eleven unit input surfaces 241a, and the radius of curvature of the unit input surface 241a is 1.1 mm and the cone constant is 0. B5 corresponds to the case where the second input surface 241 includes fifteen unit input surfaces 241a, and the radius of curvature of the unit input surface 241a is 1.1 mm and the cone constant is -1.

[0116] Through the experimental example shown, it can be determined that in B5, a uniform luminous image is achieved while satisfying the light distribution performance of the second output surface 243, wherein the curvature of the unit input surface 241a constituting the second input surface 241 is the largest and the number of unit input surfaces 241a is large.

[0117] Fig.14A1 is a view showing light emitting images of the first output surface 143 and the second output surface 243 according to an embodiment of the present disclosure. As shown in the figure, continuous light emitting images can be achieved on the first output surface 143 and the second output surface 243.

[0118] Fig. 14B is a view showing a light distribution image of a first optical module 100 and a second optical module 200 according to an embodiment of the present disclosure, and Fig. 14C 2 is a view illustrating a road surface pattern image of the first optical module 100 and the second optical module 200 according to an embodiment of the present disclosure.

[0119] As shown in the figure, according to the embodiment of the present disclosure, it can be determined that the light distribution performance for achieving low beam is met. Fig. 14B C1, C2, C3, and C4 on the light distribution image represent the same points as C1, C2, C3, and C4 of the road surface pattern image, and C1 is the point with the maximum light intensity Emax (eg, approximately 35400 cd).

[0120] According to an embodiment of the present disclosure, light distribution performance can be satisfied in a vehicle lamp extending in a vertical direction, and a uniform light-emitting image can also be achieved on a light-emitting surface.

[0121] Therefore, according to the present disclosure, the design of the vehicle lamp can be differentiated, thereby improving the competitiveness of the product.

[0122] Although specific embodiments of the present disclosure have been described above, the spirit and scope of the present disclosure are not limited thereto, and a person of ordinary skill in the art to which the present disclosure belongs may make various corrections and modifications without changing the essence of the present disclosure described in the technical solution of the present disclosure.

Claims

1. A lamp for a vehicle, comprising: a first optical module configured to form a first light distribution pattern, and the first optical module includes a first light source section and a first output lens section, the first output lens section configured to output light input from the first light source section; and a second optical module configured to form a second light distribution pattern having a light distribution characteristic different from that of the first light distribution pattern, and the second optical module includes a second light source portion and a second output lens portion, the second output lens portion being configured to output light input from the second light source portion, wherein: The first optical module and the second optical module are arranged in an upward / downward direction, The first light distribution pattern and the second light distribution pattern overlap each other to achieve low beam, and A distance from the second output lens section to a vertical focus of the second output lens section is less than a distance from the first output lens section to a vertical focus of the first output lens section.

2. The lamp according to claim 1, wherein: The first output lens portion includes a first input surface to which light is input and a first output surface from which light is output, The second output lens portion includes a second input surface to which light is input and a second output surface from which light is output, The first output lens portion and the second output lens portion are integrally formed in an upward / downward direction, and The first output surface and the second output surface include faceted lenses.

3. The lamp according to claim 2, wherein A horizontal focus of the second output lens section is formed inside the second output lens section.

4. The lamp according to claim 2, wherein: The second input surface comprises a plurality of unit input surfaces, A plurality of said unit input surfaces are arranged in a leftward / rightward direction, and In a horizontal cross section of the second output lens portion, each of the unit input surfaces has a curved shape that is convex in a direction facing the second light source portion.

5. The lamp according to claim 4, wherein The unit input surfaces have the same shape.

6. The lamp according to claim 4, wherein The curvature of the unit input surface is formed so that an output angle of light output from the second output surface is within a range of 30 degrees to 90 degrees.

7. The lamp according to claim 1, wherein The first optical module also includes: a first shielding portion, the first shielding portion being disposed between the first light source portion and the first output lens portion and configured to shield a portion of the light, The second optical module further comprises: a second shielding portion, the second shielding portion being disposed between the second light source portion and the second output lens portion and configured to shield a portion of the light, and Wherein, each of the first shielding portion and the second shielding portion has a shape corresponding to a cut-off line of the low beam.

8. The lamp of claim 2, further comprising: a third optical module configured to form a third light distribution pattern, the third optical module comprising a third light source section and a third output lens section, the third output lens section outputting light input from the third light source section, wherein: the third light distribution pattern has a light distribution characteristic different from the light distribution characteristics of the first light distribution pattern and the second light distribution pattern and implements a high beam, The third optical module is arranged in an upward / downward direction together with the first optical module and the second optical module, and The third output lens portion is integrally formed with the first output lens portion and the second output lens portion.

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