Lamp for vehicle

Abstract

To provide a lamp for a vehicle that improves light distribution performance and maximizes uniformity of a lighting image.SOLUTION: A lamp for a vehicle comprising a light source part 20 to emit light and a light guide part 100 to receive light emitted from the light source part and to output the light, the light guide part comprising a guide body 110 to which light irradiated from the light source part is input, an input surface formed at at least one of both ends of the guide body in an extension direction of the guide body and through which light is input, a reflective surface formed on a rear surface of the guide body and having a reflective optic part configured to reflect, to a front side, the light input through the input surface, and an output surface provided to output the light, the reflective optic part comprising a plurality of first reflective optics that reflect at least a part of the input light to the front side, and second reflective optics formed in shapes different from the first reflective optics and arranged between the plurality of the first reflective optics.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a vehicle lamp. [Background technology]

[0002] Recently, vehicle lamps have been developed in various forms to enhance the aesthetics of vehicle exteriors in response to the needs of design-conscious users. In particular, light guides that reflect light transmitted from a light source to provide indirect lighting effects without directly exposing the light source have been widely adopted in vehicles. The light guide can guide incident light forward using an optic formed at the rear.

[0003] However, conventionally, the optics of a light guide are formed in a repeated shape and are formed only on the reflective surface at the rear side of the light guide, which causes hot spots and shadows when the lamp is turned on, resulting in an uneven lighting image.In particular, in the case of a light guide that is bent in a free shape for aesthetic reasons, it is difficult to achieve a uniform lighting image with only the optics formed at the rear side.

[0004] Therefore, there is a need to develop a light guide that can ensure design freedom and improve both light distribution performance and lighting uniformity. Summary of the Invention [Problem to be solved by the invention]

[0005] SUMMARY OF THE INVENTION The present invention has been developed to solve the above problems, and an object of the present invention is to provide a vehicle lamp that improves light distribution performance and maximizes the uniformity of the lighting image. [Means for solving the problem]

[0006] In order to achieve the above object, the vehicle lamp according to the present invention includes a light source unit that emits light, and a light guide unit that guides and outputs the light incident from the light source unit. When the direction in which light is emitted from the light guide unit is defined as the forward direction and the opposite direction to the forward direction is defined as the rearward direction, the light guide unit includes a guide body into which the light irradiated from the light source unit is incident, an incident surface formed on at least one of an end portion on one side and an end portion on the other side in the extension direction of the guide body, into which the light is incident, a reflective surface formed on the rear surface of the guide body, and having a reflective optic unit that reflects the light incident through the incident surface forward, and an exit surface that is a surface on the outer surface of the guide body other than the incident surface and the reflective surface and is configured to output light, and the reflective optic unit includes a plurality of first reflective optics that reflect at least a portion of the incident light forward, and second reflective optics that reflect at least a portion of the incident light forward, are formed in a shape different from the first reflective optics, and are disposed between the plurality of first reflective optics.

[0007] Each of the first and second reflective optics may be formed concavely toward the front on the reflective surface and extend in a direction perpendicular to the extension direction of the light guide portion, and the cross-sectional shape of the first reflective optic in a direction perpendicular to the extension direction of the first reflective optic may be formed in the shape of a part of a circle, and the cross-sectional shape of the second reflective optic in a direction perpendicular to the extension direction of the second reflective optic may be formed in a shape including a first inclined line and a second inclined line that contacts the first inclined line at a front end.

[0008] An angle formed between the reflecting surface and the first inclined line and an angle formed between the reflecting surface and the second inclined line may be different from each other.

[0009] The reflective optic unit may include first and second reflective optics alternately arranged along an extension direction of the light guide unit.

[0010] The reflective optic portion is formed in two stages on the reflective surface in a direction intersecting the direction in which the light guide portion extends, and when one of the two stages of the reflective optic portion is a first stage reflective optic portion and the other is a second stage reflective optic portion, the second reflective optic provided in the second stage reflective optic portion can be arranged at a position corresponding to the first reflective optic provided in the first stage reflective optic portion, and the first reflective optic provided in the second stage reflective optic portion can be arranged at a position corresponding to the second reflective optic provided in the first stage reflective optic portion.

[0011] The first and second reflective optic sections may be spaced apart from each other.

[0012] The guide body includes a first part, which is a region that extends in a forward direction from one end to the other end based on the extension direction of the light guide part, a bent part, which is a region that connects to the other end of the first part, and a second part, which is a region that extends from the bent part and extends in a backward direction as it approaches the other end, and the exit surface provided in the bent part is curved to connect the exit surface of the first part and the exit surface of the second part, and may include a plurality of optical optics that are formed concavely toward the rear.

[0013] The exit surface of the guide body has the shape of a portion of a cylindrical pipe, and when the radius of curvature of the exit surface of the bent part is taken as the radius of curvature of the bent portion on an imaginary plane including the central axis of the first part and the central axis of the second part, and the diameter of the exit surface is taken as twice the radius of curvature of the exit surface on a cross section perpendicular to the central axis of the guide body, the radius of curvature of the bent portion can be formed to be 1 to 5 times or less the diameter of the exit surface.

[0014] The optical optic may be formed on the light exit surface to extend in a direction perpendicular to the extension direction of the guide body, and a plurality of the optical optics may be formed spaced apart along the extension direction of the guide body.

[0015] The guide body may further include a third part extending from the other end of the second part in a direction perpendicular to the forward direction, the reflective optic portion provided in the first part may consist of the first reflective optic, and the reflective optic portions provided in each of the second part and the third part may include the first reflective optic and the second reflective optic arranged alternately along the extension direction of the light guide portion. [Effects of the Invention]

[0016] According to an embodiment of the present invention, reflective optics having different shapes are alternately arranged on the reflective surface of the light guide portion, thereby improving light distribution performance and maximizing the uniformity of the lighting image. [Brief explanation of the drawings]

[0017] [Figure 1] 1 is a side view illustrating a vehicle lamp according to a first embodiment of the present invention. [Figure 2] 1 is a front view of a vehicle lamp according to a first embodiment of the present invention, showing a light guide portion viewed from the front. [Figure 3] 1 is a top view of a vehicle lamp according to a first embodiment of the present invention, showing a light guide portion viewed from above. [Figure 4] 3 is an enlarged perspective view of a portion of the light guide unit according to the first embodiment of the present invention, as viewed from the rear. FIG. [Figure 5] 1A and 1B are a side view and an enlarged view of a light guide unit according to a first embodiment of the present invention, as viewed from the side; [Figure 6] FIG. 10 is an enlarged perspective view of a portion of a light guide according to a second embodiment of the present invention, as viewed from the rear. [Figure 7]7 is a partial side view of the light guide unit of FIG. 6, showing a light guide unit according to a second embodiment of the present invention; FIG. [Figure 8] FIG. 10 is a rear view illustrating a reflective surface of the light guide portion according to a modified example of the second embodiment of the present invention. [Figure 9] 3 is a side view illustrating a portion of a first part of a light guide according to an embodiment of the present invention. FIG. [Figure 10] 4 is a side view illustrating a portion of a second part of a light guide according to an embodiment of the present invention. FIG. [Figure 11] 10 is a side view illustrating a portion of a third part of a light guide according to an embodiment of the present invention. FIG. [Figure 12] 1 is a side view illustrating a part of a light guide unit according to an embodiment of the present invention, illustrating a first part, a bent part, and a light path. FIG. [Figure 13] 1 is a side view illustrating a portion of a light guide unit according to an embodiment of the present invention, illustrating an optical optic; [Figure 14] 10 is a diagram showing an image of a lighting state of a vehicle lamp according to a comparative example of the present invention; FIG. [Figure 15] 1 is a diagram showing an image of a vehicle lamp according to an embodiment of the present invention when it is turned on; [Figure 16a] 10 is a side view illustrating a light guide unit according to a comparative example of the present invention; [Figure 16b] These are iso-luminosity curves (upper diagram), an image of the lamp when lit as seen from the front (middle diagram), and an image of the lamp when lit as seen from the side (lower diagram). [Figure 17a] 10 is a side view illustrating a light guide unit according to a comparative example of the present invention; FIG. [Figure 17b] These are iso-luminosity curves (upper diagram), an image of the lamp when lit as seen from the front (middle diagram), and an image of the lamp when lit as seen from the side (lower diagram). [Figure 18a] 1 is a side view illustrating a light guide unit according to an embodiment of the present invention; [Figure 18b]These are iso-luminosity curves (upper diagram), an image of the lamp when lit as seen from the front (middle diagram), and an image of the lamp when lit as seen from the side (lower diagram). DETAILED DESCRIPTION OF THE INVENTION

[0018] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0019] First, the embodiments described below are suitable for understanding the technical features of the vehicle lamp of the present invention. However, the present invention is not limited to the embodiments described below, and the technical features of the present invention are not limited to the embodiments described below. Various modifications are possible within the technical scope of the present invention.

[0020] Fig. 1 is a side view of a vehicle lamp according to a first embodiment of the present invention, Fig. 2 is a front view of the vehicle lamp according to the first embodiment of the present invention, showing the light guide unit from the front, Fig. 3 is a top view of the vehicle lamp according to the first embodiment of the present invention, showing the light guide unit from the top, Fig. 4 is an enlarged perspective view of a portion of the light guide unit according to the first embodiment of the present invention, seen from the rear, Fig. 5 is a side view of the light guide unit according to the first embodiment of the present invention, and an enlarged view thereof, Fig. 6 is an enlarged perspective view of a portion of the light guide unit according to a second embodiment of the present invention, seen from the rear, Fig. 7 is a side view of the light guide unit according to the second embodiment of the present invention, showing a portion of the side view of the light guide unit of Fig. 6, and Fig. 8 is a rear view illustrating a reflective surface of a light guide unit according to a modified example of the second embodiment of the present invention.

[0021] Fig. 9 is a side view of a portion of a first part of a light guide unit according to an embodiment of the present invention, Fig. 10 is a side view of a portion of a second part of a light guide unit according to an embodiment of the present invention, Fig. 11 is a side view of a portion of a third part of a light guide unit according to an embodiment of the present invention, Fig. 12 is a side view of a portion of a light guide unit according to an embodiment of the present invention, illustrating the first part, the bending part, and the light path, Fig. 13 is a side view of a portion of a light guide unit according to an embodiment of the present invention, illustrating the optical optics, Fig. 14 is a diagram illustrating an image of a vehicular lamp according to a comparative example of the present invention when lit, and Fig. 15 is a diagram illustrating an image of a vehicular lamp according to an embodiment of the present invention when lit.

[0022] 16a is a side view illustrating a light guide unit according to a comparative example to the present invention, FIG. 16b is a diagram illustrating isoluminous intensity curves (upper view), an image of the lamp when lit viewed from the front (middle view), and an image of the lamp when lit viewed from the side (lower view), FIG. 17a is a side view illustrating a light guide unit according to a comparative example to the present invention, FIG. 17b is a diagram illustrating isoluminous intensity curves (upper view), an image of the lamp when lit viewed from the front (middle view), and an image of the lamp when lit viewed from the side (lower view), FIG. 18a is a side view illustrating a light guide unit according to an embodiment of the present invention, and FIG. 18b is a diagram illustrating isoluminous intensity curves (upper view), an image of the lamp when lit viewed from the front (middle view), and an image of the lamp when lit viewed from the side (lower view).

[0023] 1 to 13, 15, 18a and 18b, a vehicle lamp 10 according to an embodiment of the present invention includes a light source unit 20 and a light guide unit 100. As shown in FIG.

[0024] The light source unit 20 generates and emits light.

[0025] Specifically, various elements or devices capable of emitting light may be used for the light source unit 20. The light source unit 20 may include a light source that generates light, and the light source may be, for example, an LED (Light Emitting Diode).

[0026] The light guide unit 100 is configured to guide and emit light incident from the light source unit 20. Specifically, the light guide unit 100 may be configured to guide the light incident from the light source unit 20 by total reflection or to emit the light forward D1.

[0027] Here, the extension direction of the light guide unit 100 may have various shapes depending on the design of the vehicle lamp 10 or the vehicle. For example, as in the illustrated embodiment, the light guide unit 100 may extend to have one or more bent portions, and the extension direction of the light guide unit 100 may be changed. In this specification, the direction in which the light guide unit 100 extends is defined as the extension direction of the light guide unit 100.

[0028] In addition, for convenience of explanation, the direction in which light is emitted from the light guide section 100 is defined as a forward direction D1, and the direction opposite to the forward direction D1 is defined as a backward direction D2 in this specification.

[0029] The light guide 100 includes a guide body 110 , an entrance surface 120 , a reflection surface 130 , and an exit surface 150 .

[0030] The guide body 110 forms the main body of the light guide unit 100, and can receive light emitted from the light source unit 20. The incident surface 120, the reflecting surface 130, and the exit surface 150 can be surfaces formed on the outer surface of the guide body 110.

[0031] The incident surface 120 is formed on at least one of one end and the other end in the extension direction of the guide body 110, and light can be incident thereon. The light incident from the light source unit 20 can be guided inside the guide body 110 by total reflection, etc.

[0032] The reflecting surface 130 is formed on the rear surface D2 of the guide body 110, and may have a reflecting optic portion 131 formed thereon, which reflects light incident through the incident surface 120 to the front surface D1.

[0033] The exit surface 150 may be a surface other than the incident surface 120 and the reflecting surface 130 among the outer surfaces of the guide body 110 that is provided to emit light. Here, the exit surface 150 is a side surface of the front D1 of the guide body 110, and the direction in which the exit surface 150 faces may not coincide with the front D1. That is, as long as the light emitted from the exit surface 150 can be emitted in the forward direction D1, the direction in which the exit surface 150 faces is not limited.

[0034] Specifically, referring to the illustrated embodiment, light traveling inside the guide body 110 may reach the reflective surface 130, be reflected, and then be emitted through the emission surface 150. The reflective surface 130 may be formed on a side surface of the guide body 110 at a rear D2. Here, the direction in which the reflective surface 130 faces (a direction perpendicular to the reflective surface 130) does not necessarily coincide with the rear D2. This is because the light-guide unit 100 may be designed to have a shape including one or more bends rather than a rod shape depending on the design of the vehicle lamp 10.

[0035] The reflective optic portion 131 provided on the reflective surface 130 includes a first reflective optic 132 and a second reflective optic 133 .

[0036] The first reflecting optic 132 may be formed to reflect at least a portion of incident light forward D1, and a plurality of first reflecting optics 132 may be provided. Also, the second reflecting optic 133 may be formed to reflect at least a portion of incident light forward D1, and a plurality of second reflecting optics 133 may be provided.

[0037] In addition, the second reflecting optics 133 may be formed in a shape different from that of the first reflecting optics 132 and may be disposed between a plurality of the first reflecting optics 132 .

[0038] For example, as in the embodiment shown in Figures 4 to 8, each of the first reflective optic 132 and the second reflective optic 133 may be formed concavely toward the front D1 on the reflective surface 130 and extend in a direction perpendicular to the extension direction of the light guide unit 100.

[0039] Also, for example, the cross section of the first reflecting optic 132 in a direction perpendicular to the extension direction of the first reflecting optic 132 may be formed in the shape of a part of a circle. More specifically, the first reflecting optic 132 may be an arc-shaped groove having an arc-shaped cross section.

[0040] The arc-shaped groove-shaped first reflective optic 132 can be advantageous for diffusing light. Specifically, light reaching the first reflective optic 132 can be diffused over a wide range and totally reflected. As a result, the first reflective optic 132 has the advantage of making the lighting image of the vehicle lamp 10 uniform, but has the disadvantage of low luminous intensity.

[0041] Furthermore, for example, the cross-sectional shape of the second reflecting optic 133 in a direction perpendicular to the extension direction of the second reflecting optic 133 may be formed to have a shape including a first inclined line 1331 and a second inclined line 1332 that contacts the first inclined line 1331 at the end of the front D1. Specifically, the cross-sectional shape of the second reflecting optic 133 may be formed to have a shape including an apex formed by the contact of the first inclined line 1331 and the second inclined line 1332. In other words, the second reflecting optic 133 may be a rectangular groove including a first inclined surface including the first inclined line 1331, a second inclined surface including the second inclined line 1332, and a corner where the first inclined surface and the second inclined surface contact each other.

[0042] The rectangular groove-shaped second reflecting optic 133 has the advantage of being able to concentrate and reflect high-intensity light in a desired direction. Specifically, the light that reaches the second reflecting optic 133 can be concentrated and emitted in a specific direction. As a result, the second reflecting optic 133 has the advantage of being able to concentrate and reflect high-intensity light, but has the disadvantage of reducing the light uniformity of the lighting image and causing large differences in the lighting image depending on the viewing angle.

[0043] As a comparative example of the present invention, Figure 16a illustrates the light path when the reflective optic portion 131a of the reflective surface 130a of the light guide portion consists solely of the first reflective optic 132a with an arc-shaped groove. Figure 16b also illustrates iso-luminosity curves (top view), an image of the lamp when lit as viewed from the front D1 (middle view), and an image of the lamp when lit as viewed from the side (bottom view). As in the comparative example shown, light totally reflected by the first reflective optic 132a is diffused in a wide direction, creating a uniform lit image, but the brightness of the light may be low. Reference numeral 110a, unexplained, denotes the guide body, and reference numeral 150a denotes the exit surface.

[0044] As a comparative example of the present invention, FIG. 17a illustrates the light path when the reflective optic portion 131b of the reflective surface 130b of the light guide portion is composed only of the second reflective optic 133b with a rectangular groove shape. FIG. 17b also illustrates iso-luminosity curves (top view), an image of the lamp when lit as viewed from the front D1 side (middle view), and an image of the lamp when lit as viewed from the side (bottom view). As in the comparative example shown, light totally reflected by the second reflective optics 133b is concentrated and totally reflected from the center of each second reflective optic 133b, which can emit strong light from the center, but the lit image may be uneven. Reference numeral 110b, which is an unexplained reference character, denotes the guide body, and reference numeral 150b denotes the exit surface.

[0045] Fig. 18a illustrates an embodiment of the present invention, showing the light path when the reflective optic portion 131 of the reflective surface 130 of the light guide portion is a combination of a first reflective optic 132 with an arc-shaped groove and a second reflective optic 133 with a square-shaped groove. Fig. 18b also illustrates iso-luminosity curves (upper view), an image of the lamp when turned on as seen from the front D1 side (middle view), and an image of the lamp when turned on as seen from the side (lower view).

[0046] As in the illustrated embodiment, when the arc-shaped first reflective optic 132 and the square-shaped second reflective optic 133 are alternately arranged and combined, it can be seen that light of appropriate intensity is uniformly dispersed and totally reflected. Accordingly, the light totally reflected by the reflective optic unit 131 is diffused over a wide range, ensuring the uniformity of the lighting image and increasing brightness, thereby improving light distribution performance.

[0047] As described above, according to an embodiment of the present invention, by alternately arranging reflective optics of different shapes on the reflective surface 130 of the light guide unit 100, it is possible to improve light distribution performance and maximize the uniformity of the lighting image in all directions.

[0048] Meanwhile, referring to the enlarged view of the second reflecting optic 133 shown in FIG. 5, the angle θ between the reflecting surface 130 and the first inclined line 1331 is A and the angle θ between the reflecting surface 130 and the second inclined line 1332. B can be formed to be different from each other. C ) is the angle at which the first inclined line 1331 and the second inclined line 1332 meet.

[0049] Specifically, the first inclined line 1331 is an inclined line in a direction opposite to the traveling light, and serves to totally reflect the light forward D1 and guide the light forward D1. The angle θ between the reflecting surface 130 and the first inclined line 1331 is A The travel path of the light can be determined depending on the angle θ formed between the reflecting surface 130 and the second inclined line 1332. Bis the angle θ between the reflecting surface 130 and the first inclined line 1331. A The angle θ formed by the reflecting surface 130 and the first inclined line 1331 is A The height of the second reflecting optic 133 can be determined depending on the angle θ A The smaller θ is, that is, the higher the height of the second reflecting optic 133 is, the higher the light intensity can be. A and θ B The magnitudes of may be the same as each other or may be different from each other.

[0050] According to the design specifications of the vehicle lamp 10, the spacing between the multiple second reflective optics 133, the height and inclination angle of the second reflective optics 133, etc. can be adjusted to appropriately adjust the light distribution performance and lighting image uniformity.

[0051] 4 and 5, the reflective optic unit 131 may be formed such that first reflective optics 132 and second reflective optics 133 are alternately arranged along the extension direction of the light guide unit 100.

[0052] Specifically, a plurality of first reflective optics 132 and a plurality of second reflective optics 133 may be provided, and may be alternately arranged along the extension direction of the light guide unit 100. That is, the second reflective optics 133 may be arranged between a plurality of first reflective optics 132. As described above, a plurality of first reflective optics 132 and a plurality of second reflective optics 133 are arranged spaced apart from each other along the extension direction and alternately arranged, thereby maximizing the advantages of the first reflective optics 132 and the second reflective optics 133. Therefore, according to the embodiment of the present invention, both light distribution performance and lighting image uniformity can be ensured.

[0053] Meanwhile, a light guide unit 100 according to a second embodiment is shown in Figures 6 and 7. The light guide unit 100 according to the second embodiment of the present invention differs in the arrangement of the reflective optic portion 131'.

[0054] 6 and 7, the reflective optic unit 131' according to the second embodiment of the present invention may be formed in two stages on the reflective surface 130' in a direction crossing the direction in which the light guide unit 100 extends.

[0055] Furthermore, when one of the two-stage reflective optic portions 131' is a first-stage reflective optic portion (see area I in Figure 6) and the other is a second-stage reflective optic portion (see area II in Figure 6), the second reflective optic 133' provided in the second-stage reflective optic portion 131' can be arranged at a position corresponding to the first reflective optic 132' provided in the first-stage reflective optic portion 131', and the first reflective optic 132' provided in the second-stage reflective optic portion 131' can be arranged at a position corresponding to the second reflective optic 133' provided in the first-stage reflective optic portion 131'.

[0056] Specifically, each of the first and second stage reflecting optic portions 131' and 131' may be a group of reflecting optics in which the first and second reflecting optics 132' and 133' are alternately arranged. The first and second stage reflecting optic portions 131' and 131' are arranged in two stages, and the reflecting optics of the first and second stage reflecting optic portions 131' arranged at corresponding positions may have different shapes. Also, for example, the reflecting optics of the first and second stage reflecting optic portions 131' and 131' may be arranged in a direction perpendicular to the extension direction of the reflecting surface 130'.

[0057] Therefore, for example, when the direction from the first stage reflective optic portion 131' to the second stage reflective optic portion 131' is defined as the facing direction, the second reflective optic 133' of the second stage reflective optic portion 131' can be arranged in the facing direction of the first reflective optic 132' of the first stage reflective optic portion 131'. Also, the first reflective optic 132' of the second stage reflective optic portion 131' can be arranged in the facing direction of the second reflective optic 133' of the first stage reflective optic portion 131'.

[0058] However, the arrangement of the reflective optic unit 131' is not limited to this, and a group of reflective optics in which the first reflective optics 132' and the second reflective optics 133' are alternately arranged may be arranged in three or more stages. Meanwhile, Figures 6 and 7 show how the first reflective optics 132' and the second reflective optics 133' provided in the reflective optic unit 131' of each stage are connected to each other.

[0059] Meanwhile, a modified example of the second embodiment of the present invention is shown in Figure 8. The modified example of the second embodiment of the present invention differs from the second embodiment described above in the arrangement of the reflective optic portion 131''.

[0060] According to a modified example of the second embodiment of the present invention, the first stage reflective optic portion 131'' (see area I in FIG. 8) and the second stage reflective optic portion 131'' (see area II in FIG. 8) may be formed spaced apart from each other.

[0061] Here, the arrangement of the first stage reflective optic portion 131'' and the second stage reflective optic portion 131'' may be such that, as in the second embodiment described above, the second reflective optic 133'' provided in the second stage reflective optic portion 131'' is disposed at a position corresponding to the first reflective optic 132'' provided in the first stage reflective optic portion 131'', and the first reflective optic 132'' provided in the second stage reflective optic portion 131'' is disposed at a position corresponding to the second reflective optic 133'' provided in the first stage reflective optic portion 131''.

[0062] In a modification of the second embodiment of the present invention, the first and second reflecting optic portions 131'' and 131'' may be spaced apart from each other to adjust the length of the first and second reflecting optic portions 132'' and 133'' in the opposing direction. Specifically, the lengths of the first and second reflecting optics 132'', 133'' provided in the first reflecting optic portion 131'' and the first and second reflecting optics 132'', 133'' provided in the second reflecting optic portion 131'' in the opposing direction can be adjusted depending on the degree to which the first and second reflecting optic portions 131'' and 131'' are spaced apart from each other.

[0063] This allows the light pattern and the degree of uniformity of the light intensity to be adjusted according to the design specifications of the vehicle lamp 10.

[0064] Also, for example, although not shown, each of the plurality of first reflecting optics 132'' and second reflecting optics 133'' can have different lengths. Specifically, for example, by increasing or decreasing the length of the first reflecting optic 132'', which is an arc-shaped optic, the uniformity of the illuminated image can be increased or decreased. Alternatively, by increasing or decreasing the length of the second reflecting optic 133'', which is a rectangular optic, the brightness of the illuminated image can be increased or decreased.

[0065] According to a modified example of the second embodiment of the present invention, the effect of adjusting the light pattern and brightness in various ways can be obtained by adjusting the distance between the two-tiered reflective optic portion 131'' in the opposing direction and the length of the first reflective optic 132'' or the second reflective optic 133''.

[0066] 1 to 3 and 9 to 13, the light guide unit 100 according to the present invention may include at least two bent portions. Specifically, the guide body 110 may include a first part 110a (see area I in FIGS. 1 to 3), a bent part 110d, and a second part 110b (see area II in FIGS. 1 to 3). This may be applied to all of the light guide units 100 according to the first and second embodiments described above.

[0067] The first part 110a may be a region that extends inclined forward D1 from one end to the other end based on the extension direction of the light-guiding unit 100. The curved part 110d may be a region that is connected to the other end of the first part 110a. The second part 110b may be a region that extends from the curved part 110d and extends inclined backward D2 toward the other end.

[0068] Here, the exit surface 150 provided on the curved part 110d may be curved to connect the exit surface 150 of the first part 110a and the exit surface 150 of the second part 110b. In addition, the exit surface 150 provided on the curved part 110d may include a plurality of optical optics 151. The optical optics 151 may be formed concave toward the rear D2.

[0069] Specifically, the first part 110a and the second part 110b of the guide body 110 may extend in different directions, and the bent part 110d is a bent part connecting them. Here, the first part 110a may be a part that extends at an incline toward the bent part 110d, i.e., toward the output direction D1. The second part 110b is a part that extends at an incline in the opposite direction from the bent part 110d, as it extends away from the bent part 110d.

[0070] When the light guide unit 100 has a bent portion that curves toward the forward direction D1, hot spots where light concentrates or dark areas may occur even if the reflective surface 130 has the reflective optic 131. This may result in an uneven lighting image. When the light guide unit 100 has a free design including a bent portion, the reflective optic formed on the reflective surface 130 alone may have limitations in ensuring the uniformity of the lighting image. The light guide unit 100 according to the embodiment of the present invention can solve this problem by further forming the optical optic 151 on the exit surface 150 of the bent part 110d.

[0071] Specifically, the optical optics 151 may be formed on the light exit surface 150 of the bent part 110d of the guide body 110, which is bent convexly toward the forward direction D1, and a plurality of the optical optics 151 may be formed spaced apart from each other. For example, the optical optics 151 may be formed in a groove shape recessed into the light exit surface 150. Furthermore, the plurality of optical optics 151 may be arranged spaced apart from each other along the extension direction of the light guide unit 100. However, the shape and arrangement of the optical optics 151 are not limited to those described above.

[0072] According to an embodiment of the present invention, by further providing such an optical optic 151 on the exit surface 150, even in the case of a light guide including a curved portion, it is possible to achieve a uniform lighting image by minimizing hot spot areas and shadow zones when the vehicle lamp 10 is turned on.

[0073] Meanwhile, the region where the optical optic 151 is formed will be specifically described with reference to FIG.

[0074] The light exit surface 150 of the guide body 110 may be formed in a shape that has the shape of a part of a cylindrical pipe.

[0075] Furthermore, on a virtual plane including the central axis of first part 110a and the central axis of second part 110b, when the radius of curvature of exit surface 150 of bent part 110d is taken as the radius of curvature of the bent portion, and when the diameter of exit surface 150 is taken as twice the radius of curvature of exit surface 150 on a cross section perpendicular to the central axis of guide body 110, the radius of curvature of the bent portion can be formed to be 1 to 5 times or less the diameter of exit surface 150.

[0076] Specifically, the first part 110a and the second part 110b may have the shape of pipes extending in intersecting directions. Furthermore, on a virtual plane including the central axis of the first part 110a and the central axis of the second part 110b, the exit surface 150 may have an arc shape that is convex toward the forward direction D1. The radius of curvature of the exit surface 150 in this case is defined as the radius of curvature of the bent portion. Here, the radius of curvature of the bent portion is related to the angle formed between the first part 110a and the second part 110b.

[0077] Furthermore, on a plane perpendicular to the above-mentioned imaginary plane, the exit surface 150 has an arc shape with a curvature, and the diameter of the exit surface 150 is defined as twice the radius of curvature.

[0078] Here, when the radius of curvature of the bent portion of the emitting surface 150 is 1 to 5 times the diameter of the emitting surface 150, an optical optic can be formed on the emitting surface 150 of the bent part 110d. This is because when the radius of curvature of the bent portion is more than 5 times the diameter of the emitting surface 150, the degree of bending is not too large, and therefore the occurrence of shadow zones and hot spots is reduced. In other words, the optical optic 151 can play a role in improving the lighting image by being formed in the portion of the bent portion of the light guide unit 100 where the degree of bending is too large.

[0079] Specifically, the optical optic 151 is formed on the output surface 150, extending in a direction perpendicular to the extension direction of the guide body 110, and multiple optical optics 151 may be formed spaced apart along the extension direction of the guide body 110.

[0080] That is, each optical optic 151 may be formed long in a direction perpendicular to the extension direction of the guide body 110. Also, the optical optics 151 may be formed spaced apart along the extension direction of the guide body 110. Here, the interval between the optical optics 151, the number of optical optics, and the length of the optical optics 151 may vary depending on the design specifications of the vehicle lamp 10.

[0081] 1 to 3, the guide body 110 may further include a third part 110c (see area III in FIGS. 1 to 3) extending from the other end of the second part 110b and extending in a direction perpendicular to the direction toward the front D1. An unexplained reference numeral 110e denotes a bent portion connecting the second part and the third part.

[0082] The reflective optic portion 131 provided in the first part 110a consists of a first reflective optic 132, and the reflective optic portions 131 provided in each of the second part 110b and the third part 110c can include a first reflective optic 132 and a second reflective optic 133 arranged alternately along the extension direction of the light guide portion 100.

[0083] Specifically, since the first part 110a is formed to be inclined in a direction toward the forward direction D1, most of the light reaching the reflective optic part 131 inside the first part 110a can be totally reflected at an obtuse angle. Therefore, in order to secure a certain degree of luminous intensity when turned on and improve light uniformity, the reflective optic part 131 of the first part 110a may be formed of a first reflective optic 132 having an arc-shaped groove shape (see FIG. 9).

[0084] Meanwhile, since the second part 110b extends at an angle toward the rear D2 and the third part 110c extends perpendicular to the forward direction D1, most of the light reaching the reflective optic unit 131 in the second part 110b and the third part 110c is totally reflected at an acute angle. Therefore, the luminous intensity may be weak when lit. Therefore, to ensure lighting image uniformity and light distribution performance, the reflective optic units 131 of the second part 110b and the third part 110c may be arranged alternately with the first reflective optic 132 and the second reflective optic 133 interchanged (see FIGS. 10 and 11).

[0085] FIG. 14 is a diagram showing an image of lighting of the vehicle lamp 10 according to a comparative example of the present invention, and FIG. 15 is a diagram showing an image of lighting of the vehicle lamp 10 according to the embodiment of the present invention.

[0086] The comparative example of the present invention shown in Figure 14 is a lighting image when the reflective optic unit 131 and the optical optic unit 151 according to the present invention are not applied to a light guide including a bent portion. As shown in the figure, although the light distribution performance can be ensured, it can be confirmed that the shadow zone (see area A in Figure 14) and the hot spot (see area D in Figure 14) are excessively generated in each section, and the lighting uniformity is considerably reduced (see areas A, B, C, and D in Figure 14).

[0087] Referring to the embodiment of the present invention illustrated in FIG. 15, it can be seen that the light distribution performance is ensured and the lighting image of the vehicle lamp 10 is uniform overall, as illustrated.

[0088] Although specific embodiments of the present invention have been described in detail above, the spirit and scope of the present invention are not limited to such specific embodiments, and various modifications and variations can be made by those skilled in the art to which the present invention pertains without departing from the spirit of the present invention as set forth in the claims. [Explanation of symbols]

[0089] 10 Vehicle lamps 20 Light source section 100 Light guide unit 110, 110' Guide body 120 Entrance plane 130, 130', 130'' reflective surface 131, 131', 131'' Reflective optics 132, 132', 132'' First Reflection Optic 133, 133', 133'' Second Reflection Optic 150, 150' exit surface 151 Optics

Claims

1. a light source unit that emits light; a light guide unit that guides and outputs the light incident from the light source unit, When the direction in which light is emitted from the light guide portion is defined as the forward direction and the direction opposite to the forward direction is defined as the backward direction, The light guide portion a guide body into which light emitted from the light source unit is incident; an incident surface formed on at least one of one end and the other end in the extension direction of the guide body, on which light is incident; a reflecting surface formed on a rear surface of the guide body, the reflecting surface having a reflecting optic portion formed thereon, the reflecting optic portion reflecting the light incident through the incident surface forward; an exit surface that is a surface provided to emit light, as a surface other than the incident surface and the reflecting surface of the outer surface of the guide body, The reflective optic portion is a plurality of first reflective optics that reflect at least a portion of incident light forward; A vehicle lamp comprising: a first reflective optic and a second reflective optic formed in a different shape from each other, the second reflective optic reflecting at least a portion of incident light forward, the second reflective optic being positioned between a plurality of the first reflective optics.

2. each of the first and second reflective optics is formed on the reflective surface in a concave shape facing forward and extending in a direction perpendicular to an extension direction of the light guide portion; The first reflecting optic has a cross section perpendicular to an extension direction of the first reflecting optic that is formed in a shape of a part of a circle, 2. The vehicle lamp according to claim 1, wherein the cross-sectional shape of the second reflective optic in a direction perpendicular to the extension direction of the second reflective optic is formed to include a first inclined line and a second inclined line that contacts the first inclined line at a front end.

3. The vehicle lamp according to claim 2 , wherein an angle formed between the reflecting surface and the first inclined line and an angle formed between the reflecting surface and the second inclined line are different from each other.

4. The vehicle lamp according to claim 1 , wherein the first and second reflective optics of the reflective optic portion are alternately arranged along an extension direction of the light guide portion.

5. The reflective optic portion is The reflecting surface is formed in two stages in a direction intersecting with the direction in which the light guide portion extends, When one of the two stages of the reflecting optic section is a first stage reflecting optic section and the other is a second stage reflecting optic section, the second reflecting optic provided in the second stage reflecting optic section is disposed at a position corresponding to the first reflecting optic provided in the first stage reflecting optic section; The vehicle lamp according to claim 4 , wherein the first reflective optic provided in the second stage reflective optic portion is disposed at a position corresponding to the second reflective optic provided in the first stage reflective optic portion.

6. The vehicle lamp according to claim 5 , wherein the first and second reflective optic portions are spaced apart from each other.

7. The guide body is a first part that is a region that extends in a forward direction from one end to the other end of the light guide portion based on the extension direction of the light guide portion; a bent part which is a region connected to the other end of the first part; a second part that is a region extending from the bent part and extending so as to be inclined rearward as it approaches the other end, The light exit surface provided on the bent part is the light emitting surface of the first part is curved to connect the light emitting surface of the second part, 10. The vehicle lamp of claim 1, comprising a plurality of rearwardly concave optics.

8. the light exit surface of the guide body has a shape of a part of a cylindrical pipe, a curvature radius of the light exit surface of the bent part is defined as a curvature radius of a bent part on a virtual plane including a central axis of the first part and a central axis of the second part; When the diameter of the exit surface is twice the radius of curvature of the exit surface on a cross section perpendicular to the central axis of the guide body, 8. The vehicle lamp according to claim 7, wherein the radius of curvature of the bent portion is set to be 1 to 5 times or less the diameter of the light exit surface.

9. The optical optic is The guide body has a guide groove formed on the light exit surface, the guide groove extending in a direction perpendicular to the extension direction of the guide body. The vehicle lamp according to claim 7 , wherein the plurality of optics are spaced apart along the extension direction of the guide body.

10. The guide body is a third part extending from the other end of the second part in a direction perpendicular to the forward direction, the reflecting optic portion provided in the first part is the first reflecting optic, 8. The vehicle lamp according to claim 7, wherein the reflective optic portions provided in each of the second part and the third part include the first reflective optic and the second reflective optic arranged alternately along the extension direction of the light guide portion.

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