Motorcycle headlight

Abstract

To provide a motorcycle headlight that can meet a requirement (single lamp requirement) established by a law when low beam lighting fixture units and rod-like light guide parts are used.SOLUTION: A motorcycle headlight 10 comprises a pair of low beam lighting fixture units 20 arranged in a vehicle width direction, a pair of rod-like light guide parts 43 including additional light emitting parts 43c arranged between the pair of low beam lighting fixture units, and additional light sources for emitting light for making the respective additional light emitting parts of the pair of rod-like light guide parts emit the light. The additional light sources are lighted in conjunction with lighting of the low beam lighting fixture units, and extinguished in conjunction with extinguishing of the low beam lighting fixture units.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present disclosure relates to a headlight for a motorcycle.

Background Art

[0002] A headlight for a motorcycle having a configuration in which a combination of a reflector-type dedicated low-beam lamp, a reflector-type dedicated high-beam lamp arranged inside the dedicated low-beam lamp in the vehicle width direction, and a reflector-type high-beam / low-beam dual-purpose lamp arranged inside the dedicated high-beam lamp in the vehicle width direction is arranged symmetrically left and right is known (see, for example, Patent Document 1).

[0003] In this headlight for a motorcycle, at the time of low beam, in addition to the dedicated low-beam lamp, the high-beam / low-beam dual-purpose lamp lights up. Therefore, even when the distance in the vehicle width direction between the dedicated low-beam lamps does not satisfy the single-lamp requirement (requirements defined by regulations), by setting the distance in the vehicle width direction between the high-beam / low-beam dual-purpose lamps so as to satisfy the single-lamp requirement, the headlight for a motorcycle as a whole can satisfy the single-lamp requirement.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, in the headlight for a motorcycle described in Patent Document 1, when a low-beam lamp unit and a rod-shaped light guide part are used, satisfying the single-lamp requirement is not considered at all, and there is room for improvement.

[0006] The present disclosure has been made to solve such problems, and an object thereof is to provide a headlamp for a motorcycle that can satisfy the single lamp requirement when using a low beam lamp unit and a rod-shaped light guide unit.

Means for Solving the Problems

[0007] The headlamp for a motorcycle according to the present disclosure includes a pair of low beam lamp units arranged in the vehicle width direction, a pair of rod-shaped light guide units including an additional light emitting portion arranged between the pair of low beam lamp units, and an additional light source that emits light for causing the additional light emitting portion of each of the pair of rod-shaped light guide units to emit light. The additional light source is lit in conjunction with the lighting of the low beam lamp unit and is turned off in conjunction with the extinguishing of the low beam lamp unit.

[0008] With such a configuration, it is possible to provide a headlamp for a motorcycle that can satisfy the single lamp requirement when using a low beam lamp unit and a rod-shaped light guide unit.

[0009] This is because an additional light source that causes an additional light emitting portion (for example, the tip portion) of the rod-shaped light guide unit to emit light is provided. That is, this additional light source causes the additional light emitting portion to emit light by lighting in conjunction with the lighting of the low beam lamp unit. Therefore, even when the distance in the vehicle width direction between the low beam lamp units does not satisfy the single lamp requirement, by setting the distance in the vehicle width direction between the additional light emitting portions, which are part of the rod-shaped light guide unit, to satisfy the single lamp requirement, the entire headlamp for a motorcycle can satisfy the single lamp requirement.

[0010] Further, the headlamp for a motorcycle may further include a light guide optical system that guides the light emitted by the additional light source to the additional light emitting portion.

[0011] In addition, in the above motorcycle headlamp, a reflector disposed behind the rod-shaped light guide portion is further provided, and a through hole is formed in a portion of the reflector corresponding to the additional light emitting portion of the rod-shaped light guide portion. The additional light source is disposed behind the reflector and at a position higher than the through hole so as not to be visually recognized through the through hole. The light guide optical system includes a first additional reflecting surface and a second additional reflecting surface. The first additional reflecting surface reflects the light emitted by the additional light source downward, and the second additional reflecting surface may reflect the light reflected by the first additional reflecting surface so as to irradiate the additional light emitting portion exposed from the through hole.

[0012] In addition, in the above motorcycle headlamp, the reflector is made of white resin, and the surface of the reflector may include the first additional reflecting surface and the second additional reflecting surface.

[0013] In addition, in the above motorcycle headlamp, the distance in the vehicle width direction between the pair of low beam lamp units exceeds 200 mm, and the distance in the vehicle width direction between the additional light emitting portions of the pair of rod-shaped light guide portions may be 200 mm or less.

[0014] In addition, in the above motorcycle headlamp, the interval in the vehicle width direction between the low beam lamp unit and the additional light emitting portion may be 75 mm or less.

Advantages of the Invention

[0015] According to the present disclosure, it is possible to provide a motorcycle headlamp that can satisfy the single lamp requirement when using a low beam lamp unit and a rod-shaped light guide portion.

Brief Description of the Drawings

[0016]

Figure 1

Figure 2

Figure 3

Embodiments for Carrying Out the Invention

[0017] Hereinafter, the motorcycle headlight 10 which is an embodiment of the present disclosure will be described with reference to the accompanying drawings. The same reference numerals are assigned to corresponding components in each figure, and redundant descriptions are omitted.

[0018] The motorcycle headlight 10 of the present embodiment is mounted on the front end portion of a motorcycle (not shown).

[0019] FIG. 1 is a front view (schematic view) of the motorcycle headlight 10.

[0020] As shown in FIG. 1, the motorcycle headlight 10 includes a pair of low-beam lamp units 20 arranged in the vehicle width direction, a pair of high-beam lamp units 30 arranged in the vehicle width direction, a pair of signal lamp units 40 arranged in the vehicle width direction, and a reflector 60 (omitted in FIG. 1). Further, the motorcycle headlight 10 includes an additional light-emitting portion 43c that lights up and goes out in conjunction with the lighting and extinguishing of the low-beam lamp unit 20. Further, the motorcycle headlight 10 includes an additional light source 50 (omitted in FIG. 1) as a configuration for realizing the additional light-emitting portion 43c.

[0021] The low-beam lamp unit 20 is a lamp unit that irradiates light forming a low-beam light distribution pattern, and is configured as a projector-type lamp unit. Reference numeral 21 in FIG. 1 represents a projection lens that constitutes a part of the low-beam lamp unit 20. Note that the low-beam lamp unit 20 is not limited to the projector type, and may be a reflector-type lamp unit, a direct projection type (direct irradiation type) lamp unit, a lamp unit using a light guide (light guide rod, light guide plate, etc.), or a lamp unit having other configurations.

[0022] The distance L1 in the vehicle width direction between the low beam lamp units 20 (light emitting regions) exceeds 200 mm and does not meet the single lamp requirement (requirement defined by regulations, L1 < 200 mm). On the other hand, the distance L2 in the vehicle width direction between the additional light emitting portions 43c (light emitting regions) that turn on and off in conjunction with the turning on and off of the low beam lamp units 20 is 200 mm or less, satisfying the single lamp requirement (L2 < 200 mm). Further, the distance L3 in the vehicle width direction between the low beam lamp units 20 (light emitting regions) and the additional light emitting portions 43c (light emitting regions) is 75 mm or less, meeting the requirements defined by regulations. Furthermore, the distance in the vehicle width direction between the signal lamps 40 (light emitting regions) exceeds 75 mm.

[0023] The high beam lamp unit 30 is a lamp unit that irradiates light forming a high beam light distribution pattern and is configured as a projector type lamp unit. Reference numeral 31 in FIG. 1 represents a projection lens that constitutes a part of the high beam lamp unit 30. Note that the high beam lamp unit 30 is not limited to the projector type, and may be a reflector type lamp unit, a direct projection type (direct irradiation type) lamp unit, a lamp unit using a light guide (light guide rod, light guide plate, etc.), or a lamp unit with other configurations.

[0024] FIG. 2 is a front view of the signal lamp 40 and the like. The signal lamp 40 is a signal lamp that functions as a DRL lamp and a position lamp. As shown in FIG. 2, the signal lamp 40 includes a light source 41 and a rod-shaped light guide 42.

[0025] The light source 41 is, for example, a semiconductor light emitting element such as an LED that emits white light. The light source 41 has a light emitting surface (for example, a rectangular light emitting surface with a side length of 1 mm). The light source 41 is arranged such that its light emitting surface faces the end face (light incident surface) on the base end BE 42 side of the rod-shaped light guide 42.

[0026] The rod-shaped light guide 42 guides the light from the light source 41. The rod-shaped light guide 42 is made of, for example, a transparent resin such as acrylic or polycarbonate. The rod-shaped light guide 42 has a base end BE42 The side end face and the light from the light source 41 that enters from the end face are directed towards the tip FE 42 side and a rod-shaped light guide portion 43 that guides the light. The rod-shaped light guide portion 43 is a so-called light guide rod and is configured in a three-dimensionally curved shape. Specifically, the rod-shaped light guide portion 43 extends from the base end portion BE 42 side obliquely downward in the front of the vehicle and extends obliquely downward inside the vehicle via the curved portion C1.

[0027] Hereinafter, an example in which a rod-shaped light guide body having a general circular cross-sectional shape is used as the rod-shaped light guide portion 43 will be described, but it is not limited thereto. For example, a rod-shaped light guide body having a ginkgo leaf shape or a rod-shaped light guide body having other cross-sectional shapes may be used as the rod-shaped light guide portion 43.

[0028] The outer peripheral surface of the rod-shaped light guide portion 43 includes a light emitting surface 43a disposed on the front side of the vehicle (light irradiation direction) and a reflecting surface 43b disposed on the opposite rear side of the vehicle. Also, the rod-shaped light guide portion 43 includes an additional light emitting portion 43c disposed between the low beam lamp units 20. Hereinafter, the case where the additional light emitting portion 43c is the tip portion of the rod-shaped light guide portion 43 (see FIG. 2) will be described as an example, but it is not limited thereto. For example, the additional light emitting portion 43c may be an intermediate portion between the tip portion and the base end portion of the rod-shaped light guide portion 43.

[0029] The cross-sectional shape orthogonal to the longitudinal direction of the light emitting surface 43a is a convex arc shape toward the front side of the vehicle (light irradiation direction). The reflecting surface 43b includes a plurality of optical elements (not shown) that internally reflect (total reflect) the light from the light source 41 that is guided through the rod-shaped light guide portion 43 and enters the reflecting surface 43b and emits the light from the light emitting surface 43a. The optical element is, for example, a lens cut (for example, a V groove). The optical element is provided, for example, in the range indicated by reference numeral B1 in FIG. 2.

[0030] As described above, when the light from the light source 41 is emitted from the light emitting surface 43a, the light emitting surface 43a (for example, the range indicated by reference numeral B1 in FIG. 2) emits light. As a result, a white light emitting region is formed on the light emitting surface 43a.

[0031] The additional light source 50 emits light that causes the additional light-emitting portion 43c of the rod-shaped light guide portion 43 to emit light. The additional light source 50 is, for example, a semiconductor light-emitting element such as an LED that emits white light. The additional light source 50 has a light-emitting surface (for example, a rectangular light-emitting surface with a side length of 1 mm). The additional light source 50 is disposed behind the reflector 60 (see the "A-A cross-sectional view" in FIG. 2). At this time, the additional light source 50 is disposed behind the reflector 60 and at a position higher than the through hole H1 so as not to be visually recognized from the front of the motorcycle headlight 10 through the through hole H1 formed in the reflector 60. Thus, since the additional light source 50 is disposed in a state of being covered by a part of the reflector 60, it is prevented from being visually recognized from the front of the motorcycle headlight 10 through the through hole H1 formed in the reflector 60.

[0032] The additional light source 50 is turned on in conjunction with the lighting of the low-beam lamp unit 20 (a low-beam light source not shown) and is turned off in conjunction with the extinguishing of the low-beam lamp unit 20 (a low-beam light source not shown).

[0033] The reflector 60 is disposed behind the rod-shaped light guide 42 (rod-shaped light guide portion 43) (see the "A-A cross-sectional view" in FIG. 2). The reflector 60 is made of white resin. As the white resin, for example, a transparent silicone resin in which titanium oxide particles having a wider band gap than visible light are dispersed, such as those described in JP-A-2019-220569 and Japanese Patent No. 5224173, may be used. The surface of the reflector 60 includes a main reflection surface 61, a first additional reflection surface 62, and a second additional reflection surface 63 as shown in FIG. 2 (see the "A-A cross-sectional view" in FIG. 2) and FIG. 3. FIG. 3 is a view in which the rod-shaped light guide 42 is omitted from FIG. 2. The first additional reflection surface 62 and the second additional reflection surface 63 are an example of the light guide optical system of the present disclosure.

[0034] The main reflecting surface 61 is disposed behind the rod-shaped light guide portion 43 so as to cover the reflecting surface 43b side of the rod-shaped light guide portion 43 (see "Cross-sectional view taken along line A-A" in Fig. 2). The main reflecting surface 61 is provided in the range indicated by reference numeral B2 (reference numeral B1 in Fig. 2) in Fig. 3. A through hole H1 is formed at a position corresponding to the additional light emitting portion 43c of the rod-shaped light guide portion 43 in the reflector 60. The through hole H1 penetrates the main reflecting surface 61 side and the opposite side of the reflector 60. The additional light emitting portion 43c (mainly the reflecting surface 43b) is exposed from the through hole H1.

[0035] The first additional reflecting surface 62 is disposed in front of the additional light source 50 (light emitting surface) (see "Cross-sectional view taken along line A-A" in Fig. 2). The first additional reflecting surface 62 reflects the light Ray 50 emitted by the additional light source 50 downward. The first additional reflecting surface 62 is configured as a paraboloid of revolution reflecting surface with the additional light source 50 as the focus in order to reflect the light Ray 50 incident from the additional light source 50 as downward collimated light. Note that the first additional reflecting surface 62 may be any reflecting surface as long as it reflects the light Ray 50 incident from the additional light source 50 downward, and may be a reflecting surface other than the paraboloid of revolution reflecting surface.

[0036] The second additional reflecting surface 63 is disposed below the first additional reflecting surface 62 and behind the through hole H1 formed in the reflector 60 (see "Cross-sectional view taken along line A-A" in Fig. 2). The second additional reflecting surface 63 reflects the light Ray 50 so as to irradiate the additional light emitting portion 43c exposed from the through hole H1, and reflects the light Ray 50 reflected by the first additional reflecting surface 62. The second additional reflecting surface 63 is configured as an inclined plane inclined at a predetermined angle (for example, 45°) in order to reflect the light Ray 50 (reflected light) incident from the first additional reflecting surface 62 toward the additional light emitting portion 43c exposed from the through hole H1. Note that the second additional reflecting surface 63 may be any reflecting surface as long as it reflects the light Ray 50 (reflected light) incident from the first additional reflecting surface 62 toward the additional light emitting portion 43c exposed from the through hole H1, and may be a reflecting surface other than the inclined plane.

[0037] In the motorcycle headlamp 10 configured as described above, a position lamp can be realized by lighting the light source 41.

[0038] In the position lamp, the optical path of the light emitted by the light source 41 is as follows.

[0039] When the light source 41 is lit, the light emitted by the light source 41 enters the rod-shaped light guide 42 from the end face (light incident surface) on the base end portion BE side of the rod-shaped light guide 42, and is guided toward the tip end portion (tip end portion FE 42 ) side within the rod-shaped light guide portion 43 while repeatedly undergoing internal reflection (total reflection) within the rod-shaped light guide portion 43. 42

[0040] Then, a part of the light guided within the rod-shaped light guide portion 43 is internally reflected (total reflected) by the reflection surface 43b (optical element) of the rod-shaped light guide portion 43 and exits from the light exit surface 43a of the rod-shaped light guide portion 43. As a result, the light exit surface 43a of the rod-shaped light guide portion 43 emits light. Thereby, a white light-emitting region is formed on the light exit surface 43a of the rod-shaped light guide portion 43.

[0041] Also, another part of the light guided within the rod-shaped light guide portion 43 leaks out from the rod-shaped light guide portion 43 and is reflected (diffusely reflected) by the main reflection surface 61. As a result, the reflector 60 (main reflection surface 61) behind the rod-shaped light guide portion 43 emits light relatively weakly. Thereby, a relatively weakly emitting white light-emitting region is formed behind the rod-shaped light guide portion 43.

[0042] As described above, the position lamp is realized mainly by the light from the light source 41 that exits from the light exit surface 43a of the rod-shaped light guide portion 43. In the motorcycle headlamp 10 configured as described above, a DRL lamp can be realized by lighting the light source 41 brighter than when the position lamp is on.

[0043] Next, an operation example when the low beam lamp unit 20 is lit in the motorcycle headlamp 10 configured as described above will be described.

[0044] When the low beam lamp unit 20 (low beam light source not shown) is lit, the additional light source 50 is simultaneously lit in conjunction with this.

[0045] The light emitted from the low beam light source exits from the projection lens 21 that forms part of the low beam lamp unit 20. As a result, the projection lens 21 emits light. Thereby, a white low beam light emitting region is formed on the projection lens 21.

[0046] On the other hand, the light Ray emitted from the additional light source 50 50 (see "Cross-sectional view A-A" in Fig. 2) is reflected (diffusely reflected) in this order by the first additional reflection surface 62 and the second additional reflection surface 63, irradiates the additional light emitting portion 43c exposed from the through hole H1 formed in the reflector 60, and is irradiated forward through the additional light emitting portion 43c. As a result, the rod-shaped light guide portion 43 (additional light emitting portion 43c) emits light. Thereby, in addition to the low beam light emitting region formed on the projection lens 21, a white low beam light emitting region is additionally formed in the additional light emitting portion 43c. That is, it becomes possible to use a part (additional light emitting portion 43c) of the signal lamp 40 different from the low beam lamp unit 20 as the low beam light emitting region.

[0047] Also, a part of the light Ray emitted from the additional light source 50 50 is reflected (diffusely reflected) by the main reflection surface 61. As a result, the reflector 60 (main reflection surface 61) behind the rod-shaped light guide portion 43 emits light relatively weakly. Thereby, a white light emitting region that emits light relatively weakly is formed behind the rod-shaped light guide portion 43.

[0048] As described above, according to the present embodiment, it is possible to provide a headlamp 10 for a motorcycle that can satisfy the single lamp requirement when using the low beam lamp unit 20 and the rod-shaped light guide portion 43.

[0049] This is because by providing an additional light source 50 that causes an additional light-emitting portion 43c, which is a part (e.g., the tip portion) of the rod-shaped light guide portion 43, to emit light, a part (the additional light-emitting portion 43c) of the signal lamp 40 different from the low-beam lamp unit 20 can be used as a low-beam light-emitting region. That is, this additional light source 50 causes the additional light-emitting portion 43c to emit light by lighting up in conjunction with the lighting of the low-beam lamp unit 20 (a low-beam light source not shown). Therefore, even when the distance L1 in the vehicle width direction between the low-beam lamp units 20 does not satisfy the single-lamp requirement (L1 < 200 mm), by setting the distance L2 in the vehicle width direction between the additional light-emitting portions 43c, which are parts of the rod-shaped light guide portion 43, to satisfy the single-lamp requirement (L2 < 200 mm), the entire headlamp 10 for a motorcycle can satisfy the single-lamp requirement.

[0050] Next, a modified example will be described.

[0051] In the above-described embodiment, an example in which a signal lamp 40 that functions as a DRL (Daytime Running Lamp) lamp and a position lamp is used has been described, but it is not limited to this. For example, the signal lamp 40 of the present disclosure may be a signal lamp that functions as a lamp (one or more lamps) other than the DRL (Daytime Running Lamp) lamp and the position lamp.

[0052] Also, in the above-described embodiment, light Ray emitted from the additional light source 50 and reflected (diffusely reflected) in this order by the first additional reflection surface 62 and the second additional reflection surface 63 50(Refer to the "A-A cross-sectional view" in FIG. 2) An example of causing the additional light-emitting portion 43c to emit light by irradiating the additional light-emitting portion 43c exposed from the through-hole H1 has been described, but it is not limited thereto. For example, the first additional reflecting surface 62 and the second additional reflecting surface 63 may be omitted, and the light emitted from the additional light source 50 may directly irradiate the additional light-emitting portion 43c exposed from the through-hole H1 to cause the additional light-emitting portion 43c to emit light. Also, one of the first additional reflecting surface 62 and the second additional reflecting surface 63 may be omitted. Furthermore, in addition to the first additional reflecting surface 62 and the second additional reflecting surface 63, another additional reflecting surface may be used.

[0053] All the numerical values shown in the above embodiments are merely examples, and it goes without saying that appropriate different numerical values can be used.

[0054] The above embodiments are merely illustrative in every respect. The present disclosure should not be construed in a limited manner by the description of the above embodiments. The present disclosure can be implemented in various other forms without departing from its spirit or main features.

Description of Reference Numerals

[0055] 10... Headlamp for motorcycle 20... Low-beam lamp unit 21... Projection lens 30... High-beam lamp unit 40... Signal lamp 41... Light source 42... Rod-shaped light guide 43... Rod-shaped light guide portion 43a... Light-emitting surface 43b... Reflecting surface 43c... Additional light-emitting portion 50... Additional light source 60... Reflector 61... Main reflecting surface 62... First additional reflecting surface 63... Second additional reflecting surface BE 42 ... Base end portion C1... Curved portion FE 42 ... Tip end portion H1... Through-hole Ray 50 … light

Claims

1. A pair of low-beam lamp units arranged in the vehicle width direction, A pair of rod-shaped light guide parts including additional light emitting parts arranged between the pair of low-beam lamp units, An additional light source that emits light for causing the additional light emitting parts of the pair of rod-shaped light guide parts to emit light, and is provided with, The additional light source is turned on in conjunction with the lighting of the low-beam lamp unit, and a headlamp for a motorcycle that is turned off in conjunction with the extinguishing of the low-beam lamp unit.

2. The headlamp for a motorcycle according to claim 1, further comprising a light guide optical system that guides the light emitted by the additional light source to the additional light emitting part.

3. Further comprising a reflector arranged behind the rod-shaped light guide part, A through hole is formed in a portion of the reflector corresponding to the additional light emitting part of the rod-shaped light guide part, The additional light source is arranged behind the reflector and at a position higher than the through hole so as not to be visually recognized through the through hole, The light guide optical system includes a first additional reflection surface and a second additional reflection surface, The first additional reflection surface reflects the light emitted by the additional light source downward, The headlamp for a motorcycle according to claim 2, wherein the second additional reflection surface reflects the light reflected by the first additional reflection surface so that the light reflected by the first additional reflection surface irradiates the additional light emitting part exposed from the through hole.

4. The reflector is made of white resin, The headlamp for a motorcycle according to claim 3, wherein the surface of the reflector includes the first additional reflection surface and the second additional reflection surface.

5. The distance in the vehicle width direction between the pair of low-beam lamp units exceeds 200 mm, The headlamp for a motorcycle according to claim 1, wherein the distance in the vehicle width direction between the additional light emitting parts of the pair of rod-shaped light guide parts is 200 mm or less.

6. The headlamp for a motorcycle according to claim 5, wherein the interval in the vehicle width direction between the low-beam lamp unit and the additional light emitting part is 75 mm or less.

Images