TWI584977B - Vehicle headlight lamp module, vehicle headlights, and vehicles - Google Patents

Description

Vehicle headlight lamp module, vehicle headlight, and vehicle

The present invention relates to a lamp module for a headlight of a vehicle, a headlight of a vehicle, and a vehicle.

Conventionally, as a lamp module for a headlight of a vehicle, a direct type lamp module including a light emitting diode (hereinafter referred to as an LED) has been known. A lamp module using an LED as a light source has a characteristic of consuming less power. The direct-type lamp module includes an LED and a lens disposed in front of the LED to refract light from the LED. Light from the LED is incident on the lens without being reflected by a reflector or the like. Light incident on the lens is refracted as it passes through the lens, and is projected from the lens toward the front.

Patent Document 1 describes a direct-type lamp module including an LED and a convex lens disposed in front of the LED. The direct light module is used together with a projection or parabolic lamp module. The low-beam light distribution pattern is formed by combining a basic light distribution pattern formed by a projection type or a parabolic lamp module with a light distribution pattern formed by a direct-type lamp module. According to the direct light module with LED, the light beam can be concentrated near the cut-off line. Therefore, it is easy to ensure visibility in the distance.

[Previous Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open Publication No. 2007-335301

However, in the direct type lamp module disclosed in Patent Document 1, in order to form a light distribution pattern necessary for low beam, it is necessary to use it together with a projection type or parabolic type lamp module. Therefore, in the technique disclosed in Patent Document 1, it is necessary to provide the same number of projection type or parabolic type lamp modules as the direct type lamp module to the vehicle. The size of the headlights cannot be avoided. Depending on the size or type of the vehicle, there is a case where a large headlight is difficult to be mounted on the vehicle. Moreover, depending on the design of the vehicle, etc., there is a case where the mounting of a large headlight is poor. As described above, depending on the vehicle, it is difficult to mount a large headlight in the vehicle.

In view of the above problems, the object of the present invention is as follows.

Preferably, the direct type lamp module can appropriately form a light distribution pattern required for the headlight regardless of whether it is used together with a projection type or a multi-reflector type lamp module. According to such a direct type lamp module, the size of the headlight can be suppressed by omitting the projection type or the multi-reflector type lamp module. Further, according to such a direct type lamp module, by using it together with a projection type or multi-reflector type lamp module, the degree of freedom in designing the light distribution pattern can be improved. Thereby, for example, a wider light distribution pattern can be formed. Moreover, a light distribution pattern more suitable for a vehicle can be formed.

That is, an object of the present invention is to provide a light module in which a direct light type lamp module using an LED as a light source and a light distribution pattern required for a headlight can be formed. Another object of the present invention is to provide a headlight having a direct light type lamp module using an LED as a light source and capable of forming a preferred light distribution pattern.

A lamp module for a headlight of a vehicle according to the present invention includes: a light emitting diode; and a lens that is disposed in front of the light emitting diode to transmit light from the light emitting diode. The lens has a first refractive portion and a first diffusion portion. When the lens is viewed from the front, the first refractive portion is positioned above the light-emitting diode, and is configured to refract light from the light-emitting diode and guide forward. The first diffusion portion has a diffusion permeability higher than that of the first refractive portion, and is located below the light-emitting diode when the lens is viewed from the front, so that the light-emitting diode is derived from the light-emitting diode. Light diffusion And the way to guide forward.

According to the lamp module described above, light from the first refracting portion of the lens which is high in directivity from the light-emitting diode is projected forward while maintaining high directivity. Among the light having high directivity of the light-emitting diode, the light that has passed through the first diffusing portion of the lens is diffused and projected forward. When the lens is viewed from the front, the first refractive portion is located above the light emitting diode. The first diffusion portion is located below the light-emitting diode. Therefore, the light having a high directivity through the first refractive portion illuminates the road surface farther away. The light diffused widely through the first diffusing portion illuminates the road surface that is closer. Therefore, according to the above lamp module, it is possible to brightly illuminate a far road surface and to illuminate a relatively close road surface in a wide range. The lamp module can form a light distribution pattern required by the headlight regardless of whether it is used together with a projection type or a multi-reflector type lamp module. Therefore, according to the above-described lamp module, by omitting the projection type or multi-reflector type lamp module, it is possible to suppress the enlargement of the headlight and to form the light distribution pattern required for the headlight. Further, according to the above-described lamp module, by using it together with a projection type or multi-reflector type lamp module, the degree of freedom in designing the light distribution pattern can be improved.

According to a preferred aspect of the present invention, when the lens is viewed from the front, the first diffusion portion is located below the first refractive portion passing through a vertical line of the light-emitting diode.

According to the above aspect, the light distribution pattern required for the headlight can be formed more appropriately.

According to still another preferred aspect of the present invention, the lens includes a second refractive portion and a second diffusion portion. When viewed from the front side of the lens, the second refractive portion is located at a position different from the first refractive portion in the vertical direction, and is configured to refract light from the light-emitting diode and guide forward. The second diffusion portion has a higher diffusion permeability than the second refractive portion, and when viewed from the front, the second diffusion portion is located closer to the second refractive portion than the second refractive portion on the horizontal line passing through the second refractive portion. The outer side of the direction is configured such that the light from the light-emitting diode is diffused and guided forward.

In the headlights of vehicles, there is a need to brightly illuminate the left and right direction of the vehicle. The center of the vehicle is irradiated to the outside of the left and right directions of the vehicle in a wide range. In this case, the outer side in the left-right direction of the vehicle may be made darker than the center in the left-right direction of the vehicle. According to the above aspect, the light having a high directivity through the second refracting portion is irradiated to the center of the vehicle in the left-right direction, and the light diffused widely through the second diffusing portion is irradiated to the outside of the vehicle in the left-right direction. . Therefore, the light distribution pattern required for the headlight can be formed more appropriately.

According to still another preferred aspect of the present invention, the lens has a third diffusing portion. The third diffusing portion has a diffuse permeability higher than that of the first refracting portion. When the lens is viewed from the front, the third diffusing portion is located closer to the vehicle than the first refracting portion passing through the horizontal line of the first refracting portion. The outer side in the left-right direction is configured to guide the light from the light-emitting diode to be guided forward.

According to the above aspect, the front side of the vehicle is irradiated with light having a high directivity through the first refracting portion, and the light diffused widely through the third diffusing portion is irradiated to the outside of the vehicle in the left-right direction. Therefore, the light distribution pattern required for the headlight can be formed more appropriately.

According to a further preferred aspect of the invention, the lens has a refractive region and a diffusion region. The refractive region includes at least the first refractive portion, and is configured to refract light from the light-emitting diode and guide it forward. The diffusion region includes at least the first diffusion portion, and is configured to diffuse light from the light-emitting diode and guide it forward. When the lens is viewed from the front, the diffusion region is formed in a substantially U shape.

According to the above aspect, the far road surface can be illuminated brightly, and the road surface can be illuminated widely. Therefore, the light distribution pattern required for the headlight can be formed more appropriately.

According to still another preferred aspect of the present invention, the diffusion region has a fourth diffusion portion. When the lens is viewed from the front, the fourth diffusion portion is located further to the left or right than the light-emitting diode and above the light-emitting diode.

According to the above aspect, a wider range of the outer side in the left-right direction of the vehicle can be irradiated. Therefore, the light distribution pattern required for the headlight can be formed more appropriately.

According to still another preferred aspect of the present invention, the diffusion region has a first region and a second region. When the lens is viewed from the front, the first region is located in a vertical section passing through the light-emitting diode. The second region is located on the outer side in the left-right direction from the first region. The length of the upper and lower directions of the second region is longer than the length of the first region in the upper and lower directions.

According to the above aspect, a wider range can be irradiated on the outer side in the left-right direction of the vehicle. Therefore, the light distribution pattern required for the headlight can be formed more appropriately.

According to still another preferred aspect of the present invention, the lens has a convex front surface facing forward and a back surface facing the light emitting diode. The first diffusion portion is formed by subjecting one of the front surface of the lens or one of the back surfaces to wrinkle processing.

According to the above aspect, the first diffusion portion can be formed inexpensively and easily.

According to still another preferred aspect of the present invention, the lens has a convex front surface facing forward and a back surface facing the light emitting diode. The first diffusion portion is formed by attaching a diffusion plate that diffuses the transmitted light to one of the front surface of the lens or one of the back surfaces.

According to the above aspect, the first diffusion portion can be formed inexpensively and easily.

The headlight of the vehicle of the present invention includes the lamp module of any of the above.

According to the above headlight, a better light distribution pattern can be formed.

Another headlight of the vehicle of the present invention includes a light emitting diode, a lens, a cover, and a diffuser. The lens is disposed in front of the light-emitting diode, and refracts light from the light-emitting diode to transmit. The cover is disposed in front of the lens to transmit light transmitted through the lens. The diffusion system is configured such that one of the light transmitted through the lens is diffused below the other portion of the light transmitted through the lens, and is guided toward the front of the cover.

According to the above-described headlight, light having high directivity from the light-emitting diode is refracted when passing through the lens, and is projected from the lens while maintaining high directivity. One of the light transmitted through the lens is partially diffused by the diffuser below the other portion of the light transmitted through the lens, and is guided as diffused light toward the front of the cover. The other portion of the light that passes through the lens is not diffused by the diffuser but is projected toward the front of the outer cover. Therefore, light that has not been diffused by the diffuser illuminates the road surface farther away, and the light diffused by the diffuser illuminates the road surface that is closer. Therefore, according to the above-described headlight, a direct-type lamp module using an LED as a light source can be used to brightly illuminate a far road surface and widely illuminate a relatively close road surface. According to the above headlight, a better light distribution pattern can be formed.

According to still another preferred aspect of the present invention, the diffuser is disposed between the lens and the cover, and is configured to diffuse the transmitted light.

According to the above aspect, even if the lens itself is not processed, one of the light having high directivity from the light-emitting diode can be diffused and projected toward the front of the cover.

According to still another preferred aspect of the present invention, the diffuser is attached to the outer cover and configured to diffuse the transmitted light.

According to the above aspect, even if the lens itself is not processed, one of the light having high directivity from the light-emitting diode can be diffused and projected toward the front of the cover.

According to still another preferred aspect of the present invention, the diffusion system is formed by subjecting a portion of the outer cover to wrinkle processing.

According to the above aspect, even if the lens itself is not processed and the diffusion plate is not disposed between the lens and the cover, one of the light having high directivity from the light-emitting diode can be partially diffused and projected toward the front of the cover.

The vehicle of the present invention includes the above-described headlights.

According to the present invention, a vehicle that exerts the above effects can be obtained.

According to the present invention, a direct-type lamp module using an LED as a light source can be provided, and A lamp module that forms a light distribution pattern required for a headlight. Further, it is possible to provide a headlight having a direct light type lamp module using an LED as a light source and capable of forming a preferred light distribution pattern.

1‧‧‧Motorcycles (vehicles)

2‧‧‧front wheel

3‧‧‧ Front fork

4‧‧‧Front fender

5‧‧‧ front cover

6‧‧‧Hands

7‧‧‧Operation switch

10‧‧‧ headlights

11‧‧‧Light module

11B‧‧‧Light Module

12‧‧‧Light module

13‧‧‧Shell

14‧‧‧ Cover

14a‧‧‧Diffusion area

14b‧‧‧Aparts other than the diffusion area

15‧‧‧ headlight room

21‧‧‧Lighting diode

22‧‧‧Substrate

23‧‧‧ Heat sink

24‧‧‧ radiator

25‧‧‧Shell

30‧‧‧ lens

31‧‧‧ positive

32‧‧‧Back

40‧‧‧Reflecting area

41‧‧‧1st Refraction Department

42‧‧‧2nd Refractive Department

50‧‧‧Diffusion area

51‧‧‧1st Diffusion Department

52‧‧‧2nd Diffusion Department

53‧‧‧3rd Diffusion Department

54‧‧‧4th Diffusion Department

55‧‧‧Diffuser

61‧‧‧Area

62‧‧‧Area

62a‧‧‧ Bright areas

62b‧‧‧Dark area

63‧‧‧ line

A1‧‧‧ length

A2‧‧‧ length

Ax‧‧‧ optical axis

BL‧‧‧ border

C‧‧‧ center line

Under D‧‧‧

Before F‧‧‧

H1‧‧‧ horizontal line

H2‧‧‧ horizontal line

L‧‧‧Left

LE‧‧‧ lower edge

L1‧‧‧Light

L2‧‧‧Light

L3‧‧‧Light

L4‧‧‧Light

L4a‧‧‧ diffused light

R‧‧‧Right

After Re‧‧‧

R1‧‧‧1st area

R2‧‧‧2nd area

U‧‧‧

UE‧‧‧Upper edge

V1‧‧‧ plumb line

Fig. 1 is a front view of a locomotive according to a first embodiment.

Fig. 2 is a vertical cross-sectional view of the headlight of the first embodiment.

Fig. 3 is a vertical cross-sectional view showing the main part of the lamp module of the first embodiment.

Fig. 4 is a view of the lens of the lamp module of the first embodiment as seen from the front.

Fig. 5(a) is a view schematically showing a light distribution pattern of a lamp module having only a refractive region by a lens. Fig. 5(b) is a view schematically showing a light distribution pattern of the lamp module of the first embodiment.

Fig. 6 is a vertical sectional view showing a headlight of a second embodiment.

Fig. 7 is a vertical sectional view showing the main part of the lamp module of the second embodiment.

Fig. 8 is a vertical sectional view showing a headlight according to a modification of the second embodiment.

Fig. 9 is a vertical cross-sectional view showing the main part of a lamp module according to another modification of the second embodiment.

Fig. 10 is a vertical sectional view showing a headlight according to a third embodiment.

The present inventors conducted intensive studies on the use of a direct-type lamp module using an LED as a light source for a headlight of a vehicle, and as a result, obtained the following findings. The directivity of light emitted from the LED is high. Therefore, the direct type lamp module using the LED as a light source has a characteristic that although the range of the light distribution is small, the light distribution is concentrated to a small range, so that sufficient brightness can be easily obtained. Therefore, in the case where a direct-type lamp module using an LED as a light source is used for a headlight of a vehicle, an advantage of being easily illuminated to a farther road surface can be obtained. On the other hand, in a direct-type lamp module in which an LED is used as a light source, the range of light distribution is small. Therefore, it is considered that it is not easy to obtain a light distribution of a road surface that requires near-light.

The inventors focused on the following situation: the headlight of the vehicle and the road surface closer to the vehicle The distance is short, so that even if the light is irradiated with a small brightness to the road surface closer to the vehicle, sufficient illumination can be obtained. The present inventors have considered the above-described characteristics of a direct-type lamp module using an LED as a light source and the above-described properties required for a headlight of a vehicle, thereby obtaining the following findings.

By diffusing the light having a high directivity from the LED of the headlight and diffusing it on the road surface closer to the vehicle, it is possible to ensure sufficient illuminance and expand the irradiation range. Thereby, it is possible to make full use of the advantages of the LED which is easily illuminated to the farther road surface, and to ensure sufficient illuminance and a wide range of illumination for the nearer road surface. Even if the direct-type lamp module is not used together with the projection type or multi-reflector type lamp module, the light distribution pattern required for the headlight can be formed. Unlike direct-type and multi-reflector type light modules, such direct-type lamp modules do not require a reflector above or below the light source. Therefore, the size in the up and down direction can be reduced. Further, by using such a direct type lamp module together with a projection type or multi-reflector type lamp module, the degree of freedom in designing the light distribution pattern can be improved. Thereby, for example, a wider light distribution pattern can be formed. Moreover, a light distribution pattern more suitable for the vehicle can be formed.

The present invention described below is based on the above findings of the present inventors.

(First embodiment)

Hereinafter, embodiments of the present invention will be described. Fig. 1 is a front view of a locomotive 1 as an example of a "vehicle". The "vehicle" is not limited to the locomotive 1. The "vehicle" may be, for example, an ATV (All Terrain Vehicle), an ROV (Recreational Off-highway Vehicle), or an automobile. A "vehicle" can also be a vehicle that turns in a tilted position. A vehicle that turns in an inclined posture is configured to be bent toward the inside of the curve when traveling on a curve. The vehicle that turns in an inclined posture is not particularly limited, and examples thereof include a straddle type vehicle such as a locomotive or a three-engine bicycle. An example of a vehicle in which the locomotive 1 of the embodiment is turned in an inclined posture. In the following description, the front, the rear, the left, the right, the upper, and the lower respectively mean that the rider of the locomotive 1 observes before, after, left, right, up, and down, unless otherwise specified. The symbols F, Re, L, R, U, and D in the drawing respectively indicate before, after, after, left, right, up, and down from the above-mentioned rider.

The locomotive 1 includes a front wheel 2, a rear wheel (not shown), and a power unit (not shown) that drives the rear wheel. The front wheel 2 is supported on the front fork 3. A front fender 4 is disposed above the front wheel 2. A front cover 5 is disposed above the front fender 4. The front cover 5 is disposed in front of a head pipe (not shown).

A headlight 10 is attached to the front cover 5. However, the member for mounting the headlight 10 is not particularly limited. Although not shown, the headlight 10 can also be mounted to a bracket that supports the body frame. The headlights 10 are illuminated before the locomotive 1 is illuminated. The headlight 10 has a lamp module 11 and a lamp module 12. The lamp modules 11 and 12 are light modules in which LEDs are used as light sources. In the following description of the lamp modules 11 and 12, the front, rear, left, right, up, and down are defined with reference to the optical axis Ax (see FIGS. 2 and 3) of the LED 21 described below. That is, the front and rear directions of the lamp modules 11 and 12 are defined so as to coincide with the direction in which the optical axis Ax of the LED 21 extends. The left and right directions and the vertical direction of the lamp modules 11 and 12 are defined so as to be orthogonal to each other on a plane orthogonal to the front and rear directions of the lamp modules 11 and 12. At this time, as the left and right directions and the vertical direction of the lamp modules 11, 12, the left and right directions and the vertical direction determined in advance for the lamp modules 11 and 12 may be applied. Further, the left and right directions and the vertical direction of the lamp modules 11 and 12 may be defined by referring to the left and right direction and the vertical direction of the locomotive 1 when the lamp modules 11 and 12 are installed in the locomotive 1. Further, the "horizontal" in the description of the lamp modules 11, 12 is parallel to the left-right direction of the lamp modules 11, 12. The "vertical" in the description of the lamp modules 11, 12 is parallel to the upper and lower directions of the lamp modules 11, 12. In the present embodiment, the front and rear directions, the left and right directions, and the vertical direction of the lamp modules 11 and 12 substantially coincide with the front and rear directions, the left and right directions, and the vertical direction of the locomotive 1, respectively. Therefore, in the following description of the lamp modules 11 and 12, the front, the rear, the left, the right, the upper and the lower respectively mean that the lamp modules 11 and 12 are mounted before, after, and after the locomotive 1 Right, up, down. In other words, in the following descriptions of the lamp modules 11 and 12, the front, the rear, the left, the right, the upper and the lower respectively mean that the rider of the locomotive 1 observes the front, the rear, the left, the right, the upper and the lower. . However, in the description of the lens 30 described below, the left and right sides when the lens 30 is viewed from the front may be used. The left and right sides of the case where the lens 30 is viewed from the front correspond to the right and left of the rider's observation from the locomotive 1, respectively. Furthermore, in setting When the direction of the optical axis Ax of the lamp modules 11 and 12 of the locomotive 1 does not coincide with the direction of the front and rear of the locomotive 1, the front and rear directions of the locomotive 1 can be defined in such a manner that the front and rear directions of the locomotive 1 coincide with the front and rear directions of the lamp modules 11, 12. .

In the embodiment, the lamp module 11 is disposed below the lamp module 12. However, the arrangement of the lamp modules 11 and 12 is not particularly limited. The lamp module 11 is a low beam lamp module that lights up when the low beam is illuminated. The lamp module 12 is a high beam lamp module that lights up when the high beam is illuminated. The handle 6 of the locomotive 1 is provided with an operation switch 7 for operating the headlight 10.

As shown in FIG. 2, the headlight 10 has a housing 13 that supports the lamp modules 11 and 12, and a housing 14 that transmits light. The lamp modules 11 and 12 can be directly supported by the housing 13 or indirectly supported by the housing 13 via other components. The housing 13 is assembled with the outer cover 14. The headlight chamber 15 is formed by the casing 13 and the outer cover 14. The lamp modules 11 and 12 are disposed in the headlight chamber 15.

3 is a vertical cross-sectional view of a main portion of the lamp module 11. 3 is a vertical cross-sectional view through the optical axis Ax of the LED 21. As shown in FIG. 3, the lamp module 11 includes an LED 21 as a light source and a lens 30 that transmits light from the LED 21. 3 is a cross-sectional view, but in FIG. 3, a hatching indicating a cross section of the lens 30 is omitted. The LED 21 is arranged to illuminate the front side. The lens 30 is disposed in front of the LED 21. The LED 21 is disposed on the substrate 22. A heat sink 24 having a plurality of fins 23 is fixed to the back side of the substrate 22. However, the cooling device that cools the substrate 22 is not limited to the heat sink 24. The lamp module 11 includes a casing 25 that houses at least the LEDs 21 and the substrate 22. However, the outer casing 25 is not essential and may be omitted.

The lens 30 is constituted by a convex lens that is convex toward the front. The lens 30 has a convex front surface 31 facing forward and a rear surface 32 facing the LED 21. However, the shape of the lens 30 is not particularly limited. Here, the term "convex lens" refers to a lens having a convex shape on the front side regardless of the shape of the back surface. Therefore, the shape of the back surface of the convex lens is not particularly limited. Examples of the back surface of the convex lens include a flat surface, a concave surface having a front surface, a convex surface having a rearward direction, or a surface including a combination thereof. Further, the front surface of the convex lens is not particularly limited as long as it is convex toward the front. The lens 30 has a refractive area 40, which refracts light from the LED 21 to be guided forward; and a diffusion region 50 that diffuses light from the LED 21 and guides it toward the front. The diffusion permeability of the diffusion region 50 is higher than the diffusion permeability of the refractive region 40. The diffuse permeability refers to a property in which light is diffused and transmitted in a plurality of directions regardless of the law of refraction when viewed macroscopically. The higher the ratio of the amount of light transmitted through the macroscopic observation to the principle of refraction and the amount of light transmitted through the total amount of light transmitted, the higher the diffusion permeability. On the other hand, the lower the ratio of the amount of light transmitted through the macroscopic observation regardless of the law of refraction and the total amount of light transmitted, the lower the diffusion permeability. In this case, the ratio of the amount of light transmitted according to the law of refraction in the total amount of light transmitted through the macroscopic observation is high.

Regarding the diffusion permeability, the diffusion region 50 and the refractive region 40 satisfy the relationship of the following formula.

[(The amount of light that diffuses through the diffusion region 50 regardless of the law of refraction during macroscopic observation) / (total amount of light transmitted through the diffusion region 50)]> [(In macroscopic observation, the diffusion through the refractive region is independent of the law of refraction) 40 amount of light) / (total amount of light transmitted through the refractive area 40)]

In the present embodiment, the refractive region 40 has substantially positive permeability. Positive permeability refers to the property of light transmission according to the law of refraction when viewed macroscopically. That is, the refracting region 40 is configured to refract light and transmit it substantially according to the law of refracting when viewed macroscopically. The refractive area 40 overlaps the LED 21 in whole or in part in the front-rear direction.

4 is a view of the lens 30 viewed from the front. When the lens 30 is viewed from the front, the diffusion region 50 is formed in a substantially U shape. When the lens 30 is viewed from the front, the diffusion region 50 extends in the upper and lower directions on the lower side of the LED 21 by the portion extending in the left-right direction from the lower side of the LED 21, and on the left side of the LED 21 The direction extending portion is continuous so as to be substantially U-shaped. When the lens 30 is viewed from the front, the diffusion region 50 is substantially U-shaped by being spaced apart from the LED 21 so as to surround the lower side, the left side, and the right side of the LED 21. However, the shape of the diffusion region 50 is not particularly limited. In the present embodiment, the diffusion region 50 is formed by crimping one portion of the front surface 31 of the lens 30. Furthermore, the diffusion region 50 can also be subjected to wrinkle processing on a portion of the back surface 32 of the lens 30. form. Further, wrinkle processing may be performed on one of the front surface 31 of the lens 30 and one of the back surfaces 32. "Wrinkle processing" physically imparts fine irregularities. By the fine concavities and convexities, the light from the LED 21 is refracted in a plurality of directions regardless of the law of refraction when viewed macroscopically. Thereby, light from the LED 21 diffuses as it passes through the diffusion region 50.

The "diffusion" in the present embodiment does not gradually change the refractive index as it proceeds in one direction of the lens 30, and the light from the LED 21 is regularly diffused in one direction. The "diffusion" in the present embodiment causes the light from the LED 21 to be randomly diffused in a plurality of directions by discontinuously changing the refractive index. The diffusion region 50 is formed, for example, as shown in FIG. 3, in that the light L1 obliquely upward with respect to the horizontal line and the light L2 obliquely downward with respect to the horizontal line are projected. The diffusion region 50 can also be formed by projecting light that is inclined toward one side with respect to a line parallel to the optical axis in the cross section passing through the optical axis of the lens 30, and light that is inclined toward the other.

As shown in FIG. 4, the refracting region 40 has the first refracting portion 41, and the first refracting portion 41 is positioned above the LED 21 when the lens 30 is viewed from the front. The diffusion region 50 has the first diffusion portion 51. When the lens 30 is viewed from the front, the first diffusion portion 51 is located below the LED 21. When the lens 30 is viewed from the front, the first diffusion portion 51 is positioned below the first refractive portion 41 passing through the vertical line V1 of the LED 21. The diffusion permeability of the first diffusion portion 51 is higher than the diffusion permeability of the first refractive portion 41. The first refractive portion 41 is configured to refract and transmit light substantially according to the law of refraction when viewed macroscopically.

Further, the refractive region 40 has the second refractive portion 42. When viewed from the front of the lens 30, the second refractive portion 42 is located at a position different from the first refractive portion 41 in the vertical direction. When the lens 30 is viewed from the front, as shown in FIG. 4, the second refractive portion 42 and the LED 21 are arranged in the left-right direction. When the lens 30 is viewed from the front, at least a part of the second refractive portion 42 overlaps at least a part of the LED 21 in the left-right direction. The second refracting portion 42 is configured to refract light from the LED 21 and guide it forward. The diffusion region 50 has a second diffusion portion 52. When the lens 30 is viewed from the front, the second diffusion portion is located on the horizontal line H1 passing through the second refractive portion 42. The refracting portion 42 is further on the outer side in the left-right direction of the lens 30. In the present embodiment, the left-right direction of the lens 30 coincides with the left-right direction of the locomotive 1. In other words, when the lens 30 is viewed from the front, the second diffusing portion 52 is located on the outer side in the left-right direction of the locomotive 1 from the second refracting portion 42 passing through the horizontal line H1 of the second refracting portion 42. Further, the outer side of the locomotive 1 in the left-right direction means a direction away from the center line C (see FIG. 1) of the locomotive 1. Regarding the outer side of the left and right direction of the locomotive 1, when it is located further to the left of the center line C of the locomotive 1, it refers to the left side, and when it is located to the right of the center line C, it refers to the right side. The diffusion permeability of the second diffusion portion 52 is higher than the diffusion permeability of the second refractive portion 42. The second refracting portion 42 is configured to substantially refract light and transmit it according to the law of refracting when viewed macroscopically.

Further, the diffusion region 50 has a third diffusion portion 53. When the lens 30 is viewed from the front, the third diffusion portion 53 is located on the outer side in the left-right direction of the lens 30 from the first refractive portion 41 passing through the horizontal line H2 of the first refractive portion 41. When the lens 30 is viewed from the front, the third diffusion portion 53 is located on the outer side in the left-right direction of the locomotive 1 from the first refracting portion 41 passing through the horizontal line H2 of the first refracting portion 41. The diffusion permeability of the third diffusion portion 53 is higher than the diffusion permeability of the first refractive portion 41.

Further, the diffusion region 50 has a fourth diffusion portion 54. When the lens 30 is viewed from the front, the fourth diffusing portion 54 is located further to the left than the LED 21 and above the LED 21. Further, when the lens 30 is viewed from the front, the fourth diffusion portion 54 may be positioned further to the right than the LED 21 and above the LED 21. When the lens 30 is viewed from the front, the fourth diffusion portion 54 may be positioned at least in the left-right direction of the LED 21 and above the LED 21. The diffusion permeability of the fourth diffusion portion 54 is higher than the diffusion permeability of the first refractive portion 41.

The diffusion region 50 has a first region R1 which is located on the vertical line V1 passing through the LED 21 when the lens 30 is viewed from the front, and a second region R2 which is located closer to the first region R1 when the lens 30 is viewed from the front. It is on the outer side of the left and right direction of the locomotive 1. The length A2 of the upper and lower directions of the second region R2 is longer than the length A1 of the upper and lower directions of the first region R1.

Further, the shape and size of the diffusion region 50 are an example. Proper diffusion can be set The shape and size of the area 50. Further, the diffusion region 50 is not necessarily limited to one. A plurality of diffusion regions may also be dispersed. The first refracting portion 41, the second refracting portion 42, the first diffusing portion 51, the second diffusing portion 52, the third diffusing portion 53, and the fourth diffusing portion 54 are formed in the lens 30 to transmit light from the LED 21 . However, in the lamp module 11, the entirety of the lens 30 is not necessarily utilized. The portion where the lens 30 is present is a portion through which the light from the LED 21 is transmitted, and the other portion of the lens 30 is a non-transmissive portion that does not transmit light from the LED 21. As shown in FIG. 3, in the vertical section passing through the optical axis Ax, the non-transmissive portion is formed above the upper edge of the transmissive portion UE. Further, the non-transmissive portion is formed below the lower edge LE of the transmissive portion. In this case, the non-transmissive portion can be formed in any manner. The non-transmissive portion may be a refracting portion that refracts light when light is transmitted, or a diffusing portion that diffuses light when light is transmitted. Wrinkle processing can also be performed on the non-transmissive portion. As such, the lens 30 can also have a transmissive portion and a non-transmissive portion. In this case, the first refractive portion 41 and the first diffusion portion 51 are formed in the transmissive portion. Further, the second refractive portion 42, the second diffusion portion 52, the third diffusion portion 53, and/or the fourth diffusion portion 54 may be formed in the transmission portion. In the lamp module 11, as shown in FIG. 3, the refractive region 40 is located at the upper edge UE of the transmission portion on the vertical section passing through the optical axis Ax. The optical axis Ax passes through the refractive area 40. The transmission region 50 is located at the lower edge LE of the transmission portion. As shown in FIG. 3, the boundary BL between the refractive region 40 and the transmission region 50 is located below the optical axis Ax on the vertical cross section through the optical axis Ax. Furthermore, the boundary BL between the refracting region 40 and the transmissive region 50 need not be specifically specified. The diffusion permeability may be gradually changed between the refractive region 40 and the transmission region 50.

Next, the light distribution pattern formed by the lamp module 11 will be described. Fig. 5(b) is a view schematically showing a light distribution pattern formed on the screen by the lamp module 11 when a vertical screen is provided in front of the headlight 10. Fig. 5(a) is a view schematically showing a light distribution pattern formed on the screen when the lens 30 is not subjected to wrinkle processing. That is, FIG. 5(a) is a view schematically showing a light distribution pattern when the lens 30 has only the refracting region 40. In FIGS. 5( a ) and ( b ), each line is connected to a line having equal illuminance points, and It means that the higher the line on the inner side, the higher the illumination. Furthermore, the H-H line in the figure passes through a horizontal line of H-V (not shown) located in front of the headlight light source.

As shown in FIG. 5(a), the light emitted from the LED 21 has a high directivity. Therefore, the range of light distribution is small. However, the light emitted from the LED 21 is concentrated to a smaller extent. Therefore, according to the LED 21, it is easy to obtain sufficient brightness. In particular, the area 61 in the center of the light distribution pattern is very bright. A so-called hot zone is formed in the region 61. By the light of the area 61, when there is no such screen, it can be brightly illuminated to a farther road surface. On the other hand, the light emitted from the LED 21 has a high directivity. Therefore, the difference in brightness between the bright area and the dark area is large. For example, in the region 62a above the line 63 in the region 62 and the region 62b below, the difference in luminance is large. Further, in Fig. 5(a), a hatching is indicated in the region 62b. In the light distribution pattern shown in Fig. 5 (a), sufficient brightness can be obtained in the bright region 62a. However, in the dark area 62b, the brightness is insufficient. In the region 62a and the region 62b, the difference in luminance is large. Therefore, in the case where the above screen is not present, there are a portion that is brightly illuminated and a portion that is irradiated darkly on the road surface that is closer to the headlight 10. Thereby, the difference in brightness between them becomes large. However, the closer road surface is closer to the headlight 10. Therefore, even if the light is irradiated to the nearer road surface with a small brightness, sufficient illuminance can be obtained. Therefore, the brightness can be suppressed with respect to the light of the region 62a of the road surface which is irradiated. On the other hand, there is a strong demand to illuminate the nearer surface as much as possible over a wider road surface. There is a need to adequately illuminate the area 62b.

As described above, in the lamp module 11 of the present embodiment, the lens 30 has the diffusion region 50. The light from the road surface of the light having higher directivity from the LED 21 is diffused by the diffusion region 50. As a result, the directivity of the light that illuminates the nearer surface is weak. Therefore, as shown in FIG. 5(b), according to the lamp module 11 of the present embodiment, it is possible to ensure an illuminance sufficient to illuminate a relatively close road surface and to illuminate a wider range. For example, as shown in Fig. 5(b), the illuminance required to illuminate the nearer surface can be ensured, and the region 62 in which the bright region 62a and the dark region 62b are mixed in Fig. 5(a) is relatively uniformly irradiated. Therefore, in the absence of the above screen At the time, the light of the area 62 can be used to illuminate the nearer surface with a wide range of illumination with sufficient illumination. As shown in Fig. 5(b), the lamp module 11 of the present embodiment can ensure the formation of the bright region 61 of the hot region. Further, the lamp module 11 can expand the area below the left, right, and right sides of the area 61 to have an illuminance sufficient to illuminate the nearer surface.

As described above, according to the lamp module 11 of the present embodiment, as shown in FIG. 4, the lens 30 has the first refractive portion 41 which is positioned above the LED 21 when the lens 30 is viewed from the front; and the first diffusion portion 51 When the lens 30 is viewed from the front, it is located below the LED 21. Among the light having high directivity of the LED 21, the light that has passed through the first refracting portion 41 is refracted while maintaining high directivity, and is projected forward. The light transmitted through the first diffusion portion 51 among the light having high directivity of the LED 21 is diffused and projected forward. The light having a high directivity through the first refractive portion 41 illuminates the road surface farther away. The light diffused widely through the first diffusion portion 51 illuminates the road surface that is closer. Therefore, according to the lamp module 11, the far road surface can be brightly illuminated, and the road surface can be illuminated widely. Therefore, according to the lamp module 11, the light distribution pattern required for the headlight 10 can be formed even if it is not used together with the projection type or multi-reflector type lamp module. It is not necessary to provide a reflector above or below the LED 21. The light distribution pattern required for the headlight 10 can be formed only by the direct type lamp module 11 having a small size in the up and down direction. Therefore, the enlargement of the headlight 10 can be suppressed, and the light distribution pattern required for the headlight 10 can be formed. Moreover, by using the lamp module 10 together with the projection type or multi-reflector type lamp module, the degree of freedom in designing the light distribution pattern can be improved.

Further, when the lens 30 is viewed from the front, the first diffusion portion 51 is positioned below the first refractive portion 41 passing through the vertical line V1 of the LED 21. The road surface that is farther away can be irradiated by light having a high directivity through the first refracting portion 41 located above the LED 21. It is possible to widely illuminate a relatively close road surface by using light diffused by the first diffusion portion 51 located below the LED 21 .

As shown in FIG. 4, the lens 30 has a second diffusion portion 52. When the lens 30 is viewed from the front, the second diffusion portion 52 is located on the second refractive portion of the horizontal line H1 passing through the second refractive portion 42. 42 is further to the outside of the left and right direction of the locomotive 1. In the headlight 10 of the locomotive 1, there is a need to brightly illuminate the center of the left and right direction of the locomotive 1 on the one hand, and to illuminate the outer side of the locomotive 1 in the left-right direction on the other hand. In this case, the outer side in the left-right direction of the locomotive 1 can be made darker than the center in the left-right direction of the locomotive 1. According to the lamp module 11 of the present embodiment, the front side of the second refracting portion 42 can be brightly illuminated by the light having high directivity, and the light diffused by the second diffusing portion 52 can illuminate the locomotive 1 in a wide range. The road surface on the outside of the left and right direction.

Further, the diffusion region 50 has a third diffusion portion 53. When the lens 30 is viewed from the front, the third diffusion portion 53 is located on the outer side in the left-right direction of the locomotive 1 from the first refracting portion 41 passing through the horizontal line H2 of the first refracting portion 41. As a result, the road surface on the outer side in the left-right direction of the locomotive 1 can be widely irradiated by the light diffused by the third diffusing portion 53.

As shown in FIG. 4, when the lens 30 is viewed from the front, the diffusion region 50 is formed in a substantially U shape. Thereby, the far road surface can be illuminated brightly, and the road surface on the outer side in the left and right direction of the locomotive 1 and the locomotive 1 can be widely irradiated.

Further, the diffusion region 50 has a fourth diffusion portion 54. When the lens 30 is viewed from the front, the fourth diffusing portion 54 is located further to the left or right than the LED 21 and above the LED 21. By this means, the light diffused by the fourth diffusing portion 54 can further illuminate the road surface on the outer side in the left-right direction of the locomotive 1 in a wide range.

Further, the diffusion region 50 has a first region R1 which is located on the vertical line V1 passing through the LED 21 when the lens 30 is viewed from the front, and a second region R2 which is located in the first region when the lens 30 is viewed from the front. R1 is further to the outside of the left and right direction of the locomotive 1. The length A2 of the upper and lower directions of the second region R2 is longer than the length A1 of the upper and lower directions of the first region R1. Thereby, the road surface on the outer side in the left-right direction of the locomotive 1 can be irradiated in a wide range.

In the present embodiment, as shown in FIG. 3, the lens 30 has a convex front surface 31 facing forward and a rear surface 32 facing the LED 21. The first diffusion portion 51 is formed by crimping one portion of the front surface 31 of the lens 30. Thereby, it can be formed inexpensively and easily The first diffusion portion 51.

(Second embodiment)

As shown in FIG. 6, the headlight 10 of the second embodiment differs from the headlight 10 of the first embodiment in the following points. The headlight 10 of the second embodiment includes a lamp module 11B instead of the lamp module 11. In the headlight 10 of the second embodiment, a diffuser 55 for diffusing the transmitted light is provided between the lamp module 11B and the cover 14. The diffuser 55 is an example of a diffuser that diffuses the transmitted light. However, the diffuser is not limited to the diffusion plate 55.

As shown in FIG. 7, unlike the lamp module 11 of the first embodiment, the lamp module 11B of the second embodiment includes a lens that is not subjected to wrinkle processing. The lens 30 of the lamp module 11B does not have the diffusion region 50. When the lens 30 is viewed from the front, the entirety of the lens 30 becomes the refractive area 40. In the lamp module 11B and the lamp module 11, the lens 30 is different, but the elements other than the lens 30 are the same. Similarly to the lamp module 11 of the first embodiment, the lamp module 11B is a direct-type lamp module in which the LED 21 is used as a light source. In the lamp module 11B, a reflector separate from the lens 30 is not provided above or below the LED 21.

The other configuration of the headlight 10 of the second embodiment is the same as that of the headlight 10 of the first embodiment. The same portions as those of the headlight 10 of the first embodiment are denoted by the same reference numerals, and their description will be omitted.

The diffuser 55 is formed such that one portion of the light L4 of the lens 30 that has passed through the lamp module 11B is diffused and guided forward. The diffusion plate 55 is formed such that one portion of the light L4 of the lens 30 that has passed through the lamp module 11B is diffused below the other portion L3 of the light, and is guided toward the front of the outer cover 14. The shape of the diffusion plate 55 is not particularly limited. The diffuser plate 55 may have the same shape as the diffusion region 50 (see FIG. 4) of the lens 30 of the first embodiment, for example, when the headlight 10 is viewed from the front. The diffusion permeability of the diffusion plate 55 (diffusion body) has a higher diffusion permeability than that of the lens 30 and the outer cover 14. For example, the diffuser plate 55 may have a diffusing portion located below the LED 21 when the headlight 10 is viewed from the front, or may have a diffusing portion located further to the left or right than the LED 21. In this case, the diffusion has The lens 30 and the outer cover 14 have high diffusion permeability. When the headlight 10 is viewed from the front, the diffusion plate 55 may be formed in a substantially U shape.

Further, the diffusion plate 55 may include a transmission region that transmits light without diffusing light, and a diffusion region that diffuses the transmitted light. In this case, when the headlight 10 is viewed from the front, the transmission region and the diffusion region have the same shape as the refractive region 40 and the diffusion region 50 of the lens 30 of the first embodiment (see FIG. 4). In this case, the diffusion region has a higher diffusion permeability than the transmission region, the lens 30, and the outer cover 14.

Further, the diffusion plate 55 may be a lens. The diffusion plate 55 may further include a refracting region that refracts light from the lamp module 11 to be guided forward, and a diffusion region that diffuses light from the lamp module 11 and guides it forward. In this case, when the headlight 10 is viewed from the front, the refractive region and the diffusion region may have the same shape as the refractive region 40 and the diffusion region 50 of the lens 30 of the first embodiment (see FIG. 4). In this case, the diffusion region has a higher diffusion permeability than the refractive region, the lens 30, and the outer cover 14.

According to the present embodiment, the light having the high directivity of the LED 21 as the light source is projected from the lamp module 11B. A portion of the light L3 from the lamp module 11B does not pass through the diffuser 55 but is projected directly toward the front. This light illuminates the road surface farther away. On the other hand, when the other portion L4 of the light from the lamp module 11B passes through the diffusion plate 55, it diffuses and is projected forward as the diffused light L4a. The diffused light L4a illuminates a relatively close road surface. Therefore, in the same manner as the headlight 10 of the first embodiment, the headlight 10 of the present embodiment can brightly illuminate a road surface that is far away and widely illuminate a road surface that is close to the road surface. Therefore, the light distribution pattern required for the headlight 10 can be formed by the direct type lamp module 11B using the LED 21 as a light source. Therefore, the enlargement of the headlight 10 can be suppressed, and the light distribution pattern required for the headlight 10 can be formed.

In the present embodiment, the diffuser 55 is spaced apart from the lens 30 and the outer cover 14. However, the diffuser plate 55 may also be mounted to the lens 30 or the outer cover 14. Alternatively, as shown in FIG. 8, the diffusion plate 55 may be attached to the inner surface of the outer cover 14. The diffusion plate 55 can also diffuse the transmitted light. membrane. Although not shown in the drawings, the diffusion plate 55 may be attached to the outer surface of the outer cover 14. Alternatively, as shown in FIG. 9, the diffusion plate 55 may be attached to the front surface 31 of the lens 30. Although not shown in the drawings, the diffusion plate 55 may be attached to the back surface 32 of the lens 30.

(Third embodiment)

In the headlight 10 shown in FIG. 6, the diffusion system that diffuses the light from the LED 21 and guides it toward the front of the outer cover 14 is separated from the lens 30 and the outer cover 14, and is disposed between the lens 30 and the outer cover 14. On the other hand, as shown in FIG. 10, the headlight 10 of the third embodiment is a diffuser formed on the outer cover 14.

In the present embodiment, a part of the outer cover 14 is subjected to wrinkle processing. The diffusion system is formed by the region 14a of the outer cover 14 that is subjected to wrinkle processing. Hereinafter, this region will be referred to as a diffusion region 14a. The shape of the diffusion region 14a is not particularly limited. For example, when the headlight 10 is viewed from the front, it may have the same shape as the diffusion region 50 (see FIG. 4) of the lens 30 of the first embodiment. The diffusion permeability of the diffusion region 14a is higher than the diffusion permeability of the region other than the diffusion region 14a in the diffusion body.

The lamp module 11B is the same as the lamp module 11B of the second embodiment. That is, the lamp module 11B is a direct-type lamp module in which the LED 21 is used as a light source, and the system lens 30 does not have the diffusion region 50. Therefore, the diffusion permeability of the diffusion region 14a is higher than the diffusion permeability of the lens 30.

The light module 11B projects light having a high directivity with the LED 21 as a light source. A portion of the light L3 from the lamp module 11B is transmitted through the region 14b of the outer cover 14 except the diffusion region 14a, and is projected directly toward the front. This light L3 illuminates the road surface farther away. On the other hand, the other portion L4 of the light from the lamp module 11B is diffused when it passes through the diffusion region 14a of the cover 14, and is projected forward as the diffused light L4a. The diffused light L4a illuminates a relatively close road surface. Therefore, the headlight 10 of the present embodiment can brightly illuminate a road surface that is far away and illuminate a relatively close road surface. Therefore, the direct type lamp module 11B using the LED 21 as a light source can form a light distribution pattern required for the headlight 10. Therefore, the enlargement of the headlight 10 can be suppressed, and the light distribution pattern required for the headlight 10 can be formed.

In the present embodiment, the wrinkle processed portion is formed on the inner surface of the outer cover 14. However, the corrugated portion may be formed on the outer surface of the outer cover 14. Further, wrinkle processing may be performed on both the inner surface and the outer surface of the outer cover 14. The diffusion region 14a may be formed in the outer cover 14 by processing other than the wrinkle processing.

In the above embodiment, the headlight 10 includes two lamp modules 11 and 12. However, the number of lamp modules in the headlight 10 is not limited to two. The headlight 10 can also have three or more lamp modules. The headlight 10 can also have one light module. Further, the headlight 10 may be provided with two or more low beam lamp modules. For example, the headlight 10 may be provided with the lamp module 11 of the first embodiment on the left and right sides of the center line of the locomotive 1 (for example, the vertical line passing through the center of the front wheel 2 in the left-right direction). The lamp module 11B and the diffusion plate 55 of the second embodiment or the third embodiment may be provided on the left and right of the center line of the locomotive 1.

In the first embodiment, the vertical line V1 of Fig. 4 is the center line of the left and right direction of the lens 30. In the first embodiment, the center line C (see FIG. 1) of the locomotive 1 coincides with the center line V1 of the lens 30 of the lamp module 11. However, the above two centerlines C and V1 need not be identical. For example, when the lamp module 11 is disposed on the left and right sides of the center line C of the locomotive 1, the center line V1 of the lens 30 of each lamp module 11 does not coincide with the center line C of the locomotive 1. The lamp module 11 on the left side is disposed to the left of the center line C of the locomotive 1. The lamp module 11 on the right side is disposed on the right side of the center line C of the locomotive 1. In this case, in the lamp module 11 on the left side, the third diffusion portion 53 of the lens 30 may be formed on the left side of the center line V1 of the lens 30. In the lamp module 11 on the right side, the third diffusion portion 53 of the lens 30 may be formed on the right side of the center line V1 of the lens 30. The diffusion region 50 of the lens 30 of each of the lamp modules 11 may not be substantially U-shaped. For example, in the lamp module 11 on the left side viewed from the front, the diffusion region 50 of the lens 30 may be formed in a substantially L shape when viewed from the front. The light source module 11 viewed from the front side may be formed in a substantially J-shape when the diffusion region 50 of the lens 30 is viewed from the front.

In the first embodiment, the lens 30 of the lamp module 11 includes the first refractive portion 41 and the second folding portion. The shot portion 42, the first diffusion portion 51, the second diffusion portion 52, the third diffusion portion 53, and the fourth diffusion portion 54. However, the lens 30 only needs to include the first refractive portion 41 and the first diffusion portion 51. The second refractive portion 42 , the second diffusion portion 52 , the third diffusion portion 53 , and the fourth diffusion portion 54 are not necessarily required. The diffusion region 50 is not limited to a substantially U-shape, and may be a strip shape extending laterally in the left-right direction when viewed from the front. The diffusion region 50 may include the first diffusion portion 51 , the second diffusion portion 52 , and a portion connecting the first diffusion portion 51 and the second diffusion portion 52 without including the third diffusion portion 53 . As described above, the diffusion region 50 can be formed in one region, or can have a plurality of regions separated from each other. The shape of the diffusion region 50 is not limited at all.

The diffusion permeability of the first diffusion portion 51, the second diffusion portion 52, the third diffusion portion 53, and the fourth diffusion portion 54 may be the same or different. The diffusion region 50 includes at least the first diffusion portion 51. The diffusion region 50 may include at least one of the second diffusion portion 52, the third diffusion portion 53, and the fourth diffusion portion 54. The portion of the diffusion portion diffusion region 50 included in the diffusion region 50 does not need to be formed to be distinguishable from the diffusion region 50. Further, each of the diffusing portions need not be configured to be distinguishable from each other. The diffusion permeability of the first refracting portion 41 and the second refracting portion 42 may be the same or different. Regarding the relationship between any of the diffusing portions and any of the refracting portions, the diffusing permeability of the diffusing portion is higher than the diffusing permeability of the refracting portion. The refractive region 40 includes at least the first refractive portion 41. The refractive region 40 may also include the second refractive portion 42. The portion of the refracting portion included in the refracting region 40 that is a portion of the refracting region 40 need not be formed to be distinguishable from the refracting region 40. The respective refracting portions need not be configured to be distinguishable from each other. Further, the diffusing portions 51 to 54 and the diffusion region 50 may be provided on the front surface 31 of the lens 30 or on the back surface 32 of the lens 30. The positions of the diffusion portions 51 to 54 and the diffusion region 50 in the thickness direction of the lens 30 (the direction of the optical axis Ax) are not particularly limited. Further, each of the diffusing portions 51 to 54 is configured such that the light of the LED 21 is diffused and guided forward so that the light transmitted through the diffusing portion forms a part of the light distribution pattern. In other words, the diffusion region 50 is configured such that the light of the LED 21 is diffused and guided forward so that the light transmitted through the diffusion region 50 forms part of the light distribution pattern. The light distribution pattern is a light distribution pattern on a road surface or a screen.

When the lens 30 is viewed from the front, the front surface of the lens 30 may be composed only of the refractive area 40 and the diffusion area 50. As shown in FIG. 4, the optical axis Ax of the LED 21 passes through the refractive area 40. When the lens 30 is viewed from the front, the entire refractive area 40 and the LED 21 overlap in the front-rear direction. When the lens 30 is viewed from the front, the diffusion region 50 does not overlap the LED 21 in the front-rear direction. When the lens 30 is viewed from the front, all the portions overlapping the LED 21 in the vertical direction are the refracting regions 40. When viewed from the front of the lens 30, the diffusion region 50 is not provided in a portion above the LED 21 and overlapping the LED 21 in the vertical direction.

The diffusion region 50 has the portions described in the following (A) to (C).

(A) When the lens 30 is viewed from the front, at least a part of the diffusion region 50 (for example, the first diffusion portion 51) is spaced apart from the LED 21 in the vertical direction, and is located below the LED 21 and overlaps the LED 21 in the vertical direction.

(B) When the lens 30 is viewed from the front, at least a part of the diffusion region 50 is spaced apart from the LED 21 in the left-right direction, and is arranged in the left-right direction with the LED 21.

(C) As shown in FIG. 4, when the lens 30 is viewed from the front, at least a part of the diffusion region 50 (for example, the third diffusion portion 53 and the fourth diffusion portion 54) is spaced apart from the LED 21 in the left-right direction, and is located at the LED 21 . The optical axis Ax or the upper edge of the LED 21 is located above.

When the lens 30 is viewed from the front, the portions described in the above (A) to (C) are continuous. When the lens 30 is viewed from the front, the diffusion region 50 is continuous along the outer edge of the lens 30 or the outer edge of the transmission portion of the lens 30 so as to include the portions described in the above (A) to (C).

When the locomotive 1 goes straight, the light that exits from the lamp module 11 and reaches the road surface passes through the diffusion region 50. When the locomotive 1 turns in an inclined posture, a portion of the right or left portion of the lens 30 near the inside of the curve is closer to the road surface. Since at least a part of the diffusion region 50 is spaced apart from the LED 21 in the left-right direction, it is located above the upper edge of the optical axis Ax or the LED 21 of the LED 21, so that the locomotive 1 is emitted from the lamp module 11 even when the locomotive 1 turns in an inclined posture. Light reaching the road will also pass through the diffusion zone 50. Whether the locomotive 1 is in an upright or In the inclined posture, the light that is emitted from the lamp module 11 and reaches the road surface passes through the diffusion region 50. As seen by the rider, the change in reflected light from the road surface is small. Further, when the locomotive 1 turns in an inclined posture, a portion of the right portion or the left portion of the lens 30 which is close to the outside of the curve is far from the road surface. At least a portion of the diffusion region 50 is spaced apart from the LED 21 in the left-right direction, and is located above the upper edge of the optical axis Ax or the LED 21 of the LED 21. Therefore, when the locomotive 1 turns in an inclined posture, the amount of light passing through the diffusion region 50 among the lights that illuminate the outside of the curve upward increases. When viewed from the other vehicle or the like, the amount of light from the headlight is small, and the change in the amount of light is small. It can reduce the occurrence of glare (glare). Such a light distribution pattern is an example of a preferred light distribution pattern formed by the diffusion region 50.

The lamp modules 11 and 12 may also include one lens 30 and a plurality of LEDs 21. When one lens 30 is viewed from the front, one lens 30 and a plurality of LEDs 21 may be overlapped in the front-rear direction. The refractive area 40 of one lens 30 and at least one of the plurality of LEDs 21 may be overlapped in the front-rear direction.

The above embodiments and modifications can be combined as appropriate.

The terms and expressions used herein are for the purpose of description and are not intended to be construed as limiting. It is to be understood that the invention is not to be construed as being limited by the scope of the invention. The invention can be implemented in many different forms. This disclosure should be considered as an embodiment of the principles of the invention. The embodiments are not intended to limit the invention to the preferred embodiments described herein and/or illustrated in the drawings. It is not limited to the embodiment described herein. The invention also includes all embodiments that are equivalent to elements, modifications, deletions, combinations, improvements, and/or changes. The limitation of the scope of the patent application shall be interpreted broadly based on the terms used in the scope of the patent application, and is not limited to the embodiments described in the specification or the review process of the present invention.

11‧‧‧Light module

21‧‧‧Lighting diode

22‧‧‧Substrate

23‧‧‧ Heat sink

24‧‧‧ radiator

25‧‧‧Shell

30‧‧‧ lens

31‧‧‧ positive

32‧‧‧Back

40‧‧‧Reflecting area

50‧‧‧Diffusion area

Ax‧‧‧ optical axis

BL‧‧‧ border

Under D‧‧‧

Before F‧‧‧

LE‧‧‧ lower edge

L1‧‧‧Light

L2‧‧‧Light

After Re‧‧‧

U‧‧‧

UE‧‧‧Upper edge

Claims (11)

a vehicle that turns in an inclined posture, and is configured to turn toward an inner side of a curve when traveling on a curve, wherein the vehicle that turns in an inclined posture is provided with a headlight, wherein the headlight has a lamp module; The module includes: a light emitting diode; and a lens disposed in front of the light emitting diode to transmit light from the light emitting diode; and the lens includes: a refractive region to enable the light emitting diode The light of the body is refracted and guided forward; the diffusion region is configured to diffuse light from the light-emitting diode and guide forward; the refractive region includes: a first refractive portion, when viewed from the front The lens is disposed above the light-emitting diode and configured to refract light from the light-emitting diode and guide forward. The diffusion region includes a first diffusion portion having a first refractive index The diffuse permeability of the portion is high, and when the lens is viewed from the front, it is located below the light-emitting diode, and is caused to be from the above-mentioned light-emitting diode The third diffusing portion has a diffusing permeability higher than that of the first reflecting portion, and is diffused and transmitted through the first reflecting portion. The horizontal line on the first refractive portion is located to the left and right of the first refractive portion And the outer side is configured to guide the light from the light-emitting diode to be guided forward; and when the lens is viewed from the front, the optical axis of the light-emitting diode or the light-emitting diode is located The upper edge is further above the upper side portion; the diffusion region of the lens is such that when the vehicle turns in a tilted posture at a curve, a portion of the upper portion near the inner side of the curve approaches the road surface, and is emitted from the light module And the light reaching the road surface passes through a portion of the upper side portion which is close to the inner side of the curved line. On the other hand, a portion of the upper side portion which is close to the outer side of the curved line is away from the road surface, and the light module illuminates the light outside the curved line upward. It is formed by the portion of the upper side portion that is close to the outside of the above-mentioned curve. In the vehicle of claim 1, which is turned in an inclined posture, when the lens is viewed from the front, the first diffusion portion is located below the first refractive portion passing through the vertical line of the light-emitting diode. A vehicle for turning in an inclined posture according to claim 1 or 2, wherein the refractive region includes: a second refractive portion located at a position different from the first refractive portion in a vertical direction when viewed from a front side of the lens, and The light from the light-emitting diode is refracted and guided forward; the diffusion region includes a second diffusion portion having a higher diffusion permeability than the second refractive portion, from the front When the lens is observed, it is located on the horizontal line passing through the second refractive portion and is located on the outer side in the left-right direction from the second refractive portion, and is configured to guide the light from the light-emitting diode to be guided forward. A vehicle that turns in an inclined posture according to claim 1 or 2, wherein the diffusion region is formed in a substantially U shape when the lens is viewed from the front. A vehicle for turning in an inclined posture according to claim 3, wherein the diffusion region is formed in a substantially U shape when the lens is viewed from the front. A vehicle for turning in an inclined posture according to claim 4, wherein the diffusion region includes a fourth diffusion portion, and when the lens is viewed from the front, the fourth diffusion portion is located to the left or right of the light-emitting diode, And it is higher above the above-mentioned light-emitting diode. A vehicle for turning in an inclined posture according to claim 5, wherein the diffusion region includes a fourth diffusion portion, and when the lens is viewed from the front, the fourth diffusion portion is located to the left or right of the light-emitting diode, And it is higher above the above-mentioned light-emitting diode. A vehicle for turning in an inclined posture according to claim 4, wherein the diffusion region comprises: a first region, which is located on a vertical line passing through the light-emitting diode when the lens is viewed from the front; and a second region When the lens is viewed from the front, it is located on the outer side in the left-right direction from the first region; and the length in the upper and lower directions of the second region is longer than the length in the upper and lower directions of the first region. A vehicle for turning in an inclined posture according to claim 5, wherein the diffusion region comprises: a first region which is located on a vertical line passing through the light-emitting diode when the lens is viewed from the front; and a second region When the lens is viewed from the front, it is located on the outer side in the left-right direction from the first region; and the length in the upper and lower directions of the second region is longer than the length in the upper and lower directions of the first region. A vehicle for turning in an inclined posture according to claim 1 or 2, wherein said lens includes a convex front surface facing forward and a rear surface opposite to said light emitting diode, and said first diffusing portion is formed by said lens One of the above positive aspects or the above One part of the back surface is formed by wrinkle processing. A vehicle for turning in an inclined posture according to claim 1 or 2, wherein the lens includes a convex front surface facing forward and a rear surface opposite to the light emitting diode, and the first diffusion portion is provided by The diffusion plate through which the light is diffused is attached to one of the front surface of the lens or a portion of the back surface.