JP2009067134A - Head lamp for two-wheeler - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a head lamp for a two-wheeler capable of ensuring the reliability by suppressing the effect of shocks and vibrations when the two-wheeler is traveling while the stability of the two-wheeler is excellent. <P>SOLUTION: An LED forms a light source 1, and an optical system is composed of two reflectors (a sub reflector 2 and a main reflector 3), and a lens 4. The LED light source 1 is mounted on a circuit substrate 5 and fitted to a heat sink 6. The sub reflector 2 has an elliptical reflective surface 2b with one focal point P1 being at the position of the light source 1. The main reflector 3 has a parabolic reflective surface 3b with its focal point being at the position of the other focal point P2 of the elliptical reflective surface 2b. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a two-wheeled vehicle headlamp, and more particularly to a two-wheeled vehicle headlamp including a heat sink that dissipates heat generated by an LED light source.

  As shown in FIG. 5, a conventional two-wheeled vehicle headlight has a pair of left and right front forks 52 fixed to a head pipe 50 via a pair of upper and lower brackets (only the upper bracket 51 is shown in FIG. 5). A front wheel (not shown) is rotatably supported at the lower end of the wheel.

A headlamp 54 is fixed to the head pipe 50 via a cowling brace 53, and a cowling 55 is fixed to the headlamp 54. A meter 56 is attached to the cowling brace 53. (For example, refer to Patent Document 1.)
JP 2001-14915 A

  By the way, since the above-mentioned headlamp is mounted at the upper position of the two-wheeled vehicle, the center of gravity of the two-wheeled vehicle is increased and stability is lowered, and impact and vibration during running are increased and the reliability of the headlamp is lowered. Will do.

  In particular, when an LED is used as the light source, it is conceivable that a heat sink is attached to the headlamp and the heat generated by the LED is dissipated by the heat sink. The stability of the lamp and the reliability of the headlight are further reduced.

  Therefore, the present invention was devised in view of the above problems, and the object of the present invention is to ensure the stability of the two-wheeled vehicle and to ensure the reliability by suppressing the impact and vibration during traveling. It is to provide a headlight for a motorcycle.

In order to solve the above problems, the invention described in claim 1 of the present invention is:
At least inside the lamp chamber formed by the lens and housing,
An LED light source;
A substrate on which the LED light source is mounted;
A heat sink to which the substrate is attached;
A first reflector having a first reflecting surface for reflecting light from the LED light source;
A second reflector having a second reflecting surface for reflecting the reflected light from the first reflecting surface;
A two-wheeled vehicle headlamp comprising a lens that transmits reflected light from the second reflecting surface and emits the light toward the front of the lamp,
The heat sink is located in the vicinity of the surface opposite to the second reflecting surface of the second reflector.

  According to a second aspect of the present invention, in the first aspect, the first reflection surface is an elliptical reflection surface having a position of the light source as a first focal point, and the second reflection surface. The surface is a parabolic reflection surface having a second focal point of the elliptical reflection surface as a focal point.

  According to a third aspect of the present invention, in the second aspect, the first reflector and the second reflector each include a straight line connecting the first focus and the second focus. It is characterized by being located on different sides across the plane.

  According to a fourth aspect of the present invention, in the motorcycle according to any one of the first to third aspects, the two-wheeled vehicle headlamp is a front fork from the front wheel rotation center of the two-wheeled vehicle in the front-rear direction of the two-wheeled vehicle. It is attached in the range of the upper end.

Moreover, the invention described in claim 5 of the present invention is
At least inside the lamp chamber formed by the lens and housing,
An LED light source;
A substrate on which the LED light source is mounted;
A mount plate to which the substrate is attached;
A heat sink integrally attached to the mount plate;
A reflector having a reflecting surface for reflecting light from the LED light source;
A shield that shields part of the reflected light from the reflective surface;
A two-wheeled vehicle headlamp comprising: a projection lens held by a lens holder that transmits the reflected light that has passed through the shield and emits the light toward the front of the lamp;
The heat sink is located in the vicinity of the surface opposite to the reflecting surface of the reflector.

  According to a sixth aspect of the present invention, in the fifth aspect, the two-wheeled vehicle headlamp is mounted in a range from the front wheel rotation center of the two-wheeled vehicle to the upper end of the front fork in the front-rear direction of the two-wheeled vehicle. It is characterized by.

  In the two-wheeled vehicle headlamp according to the present invention, an LED light source is mounted on a heat sink to suppress the temperature rise of the light source, and the heat sink is arranged at a position where the light path in the vicinity of the outside of the heavy reflector is not blocked.

  As a result, the weight of the heatsink and the reflector is concentrated between the lamps, and the impact resistance and vibration resistance against external impacts and vibrations are improved, resulting in a reliable two-wheeled vehicle headlamp.

  Further, the headlamp is mounted in the front-rear direction of the two-wheeled vehicle in the range from the front wheel rotation center of the two-wheeled vehicle to the upper end of the front fork. Therefore, the lightness of handling during traveling is improved, and it contributes to safe traveling and comfortable traveling.

  In addition, convection due to traveling wind passes through the surface of the heat sink during traveling of the two-wheeled vehicle, and heat on the surface of the heat sink is forcibly dissipated to improve heat dissipation efficiency.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to FIGS. 1 to 4 (the same reference numerals are used for the same portions). The embodiments described below are preferable specific examples of the present invention, and thus various technically preferable limitations are given. However, the scope of the present invention particularly limits the present invention in the following description. Unless stated to the effect, the present invention is not limited to these embodiments.

  FIG. 1 is a partial sectional view of Example 1 according to the embodiment of the present invention. In this embodiment, an LED is used as a light source 1, and an optical system is formed by two reflectors (a sub-reflector 2 and a main reflector 3) and a lens 4.

  The sub-reflector 2 has an elliptical surface 2a having the position of the light source 1 as one focal point P1, and the main reflector 3 is a parabola whose focal point is the position of the other focal point P2 of the elliptical surface 2a of the sub-reflector 2. It has a system surface 3a.

  Furthermore, assuming a virtual plane including the major axis X of the elliptical surface 2a, the elliptical surface 2a is located on one side of the plane, and the parabolic surface 3a is located on the other surface side.

  Each of the elliptical surface 2a and the parabolic surface 3a forms a reflective surface having a high reflectance, and is an elliptical reflective surface 2b and a parabolic reflective surface 3b, respectively.

  The lens 4 is made of a translucent material, and is disposed at a position facing the parabolic reflection surface 3 b of the main reflector 3.

  The light source 1 is mounted on the circuit board 5, and the circuit board 5 on which the light source 1 is mounted is attached to the heat sink 6 with the main light emitting surface 1 a of the light source 1 facing the elliptical reflecting surface 2 b of the sub reflector 2. . Naturally, the position where the heat sink 6 is attached is a place where the light path is not blocked.

  In the optical system configured as described above, light emitted from the main light emitting surface 1a of the light source 1 located at the focal point P1 toward the elliptical reflecting surface 2b of the sub-reflector 2 is reflected by the elliptical reflecting surface 2b and reflected light is reflected. The light beam is focused on the focal point P2, is directed toward the parabolic reflection surface 3b of the main reflector 3 using the position of the focal point P2 as a virtual light source, is reflected by the parabolic reflection surface 3b, and the reflected light becomes parallel light and travels toward the lens 4. The light that reaches the lens 4 is guided through the lens 4 and emitted from the lens 4 in the irradiation direction of the headlamp 8.

  Next, the heat dissipation system of the present embodiment will be described. When an LED is used as a light source for a lamp, it is driven with a large current in order to secure a light amount, but at that time, a large amount of heat is generated and the light emission efficiency is lowered, so that a light amount corresponding to the supplied power cannot be obtained. .

  Therefore, it is necessary to dissipate the LED in order to suppress a decrease in light emission efficiency even in a large current drive. In this embodiment, the circuit board 5 on which the LED light source 1 is mounted is attached to the heat sink 6, and heat generated when the LED light source 1 emits light moves to the heat sink 6 through the circuit board 5 and is dissipated from the heat sink 6 to the atmosphere. I am doing so.

  In this case, the light emitted from the light source 1 is directed to the illumination direction of the lamp by two reflections by the two reflecting surfaces of the elliptical reflecting surface 2 b of the sub reflector 2 and the parabolic reflecting surface 3 b of the main reflector 3. Thus, the heat sink 6 is positioned behind the main reflector 3.

  For this reason, the main reflector 3 and the heat sink 6 are arranged close to each other, whereby the weights of the main reflector 3 and the heat sink 6 are concentrated, resulting in a structure with improved vibration resistance against external vibrations, and the headlamp 8 Thinning in the depth direction is realized.

  FIG. 2 is an explanatory diagram when the headlamp 8 of this embodiment is attached to a two-wheeled vehicle. The headlamp 8 is housed in a lamp chamber 18 in which a light source 1, a sub-reflector 2 and a main reflector 3 are formed by a lens 4 and a housing 7, and a heat sink 6 extending from the lamp chamber 18 is located outside the lamp chamber 18. Yes. In addition, the light source 1, the sub reflector 2, and the main reflector 3 are not illustrated.

  A headlamp 8 is attached in the front-rear direction of the two-wheeled vehicle in a range from the front wheel rotation center of the two-wheeled vehicle to the upper end of the front fork 9.

  At this time, the heat sink 6 is heavy, and the overall weight of the headlamp 8 provided with the heat sink 6 is further increased. By making such a heavy headlight 8 close to the center of gravity of the two-wheeled vehicle in particular, the rotational moment of the two-wheeled vehicle is reduced, handling lightness is improved, and it contributes to safe driving and comfortable driving. became.

  Further, the headlamp 8 is attached to the two-wheeled vehicle so that the longitudinal direction of the heat sink 6 is substantially parallel to the front fork 9. As a result, the center of gravity of the thinned headlamp 8 can be brought closer to the rotation center axis of the front fork 9, and the rotational moment can be reduced to improve handling, maneuverability, stability, and the like.

  In addition, as described above, the headlamp 8 has improved the shock resistance and vibration resistance against the impact and vibration during traveling of the two-wheeled vehicle by concentrating the weight of the main reflector 3 and the heat sink 6. This is a highly reliable headlamp 8 in which occurrence of problems due to vibration and vibration is suppressed.

  Furthermore, the heat sink 6 extends from the inside of the lamp chamber 18 and is also located outside the lamp chamber 18, and convection due to traveling wind passes through the surface of the portion of the heat sink 6 located outside the lamp chamber 18 when the two-wheeled vehicle travels. The heat of the surface of the heat sink 6 is forcibly dissipated to improve the heat dissipation efficiency.

  FIG. 3 is a sectional view of Example 2 according to the embodiment of the present invention. In the headlamp 8 of this embodiment, a lamp unit 20 is accommodated in a lamp chamber 18 formed by a lens 4 and a housing 7. The lamp unit 20 uses an LED as a light source 1 and a mount plate 12 on which the light source 1 is mounted. The reflector 13, the shield 14, the lens holder 15, and the projection lens 16 form an optical system.

  The inner peripheral surface of the reflector 13 forms an aspheric reflecting surface having a high reflectivity and is an aspheric reflecting surface 17. A shield 14 and a lens holder 15 are disposed in front of the reflector 13, and a projection lens 16 is disposed so as to close the opening of the lens holder 15.

  The mount plate 12 extends from the inside of the reflector 13 to the outside of the lamp unit 20, and the heat sink 6 is attached to a portion located outside. Naturally, the position where the heat sink 6 is attached is a place where the light path is not blocked.

  In the optical system configured as described above, the light emitted from the LED light source 1 toward the aspherical reflecting surface 17 of the reflector 13 is reflected by the aspherical reflecting surface 17, and the reflected light is directed toward the shielding body 14. The passed light is propagated through the lens holder 15 and reaches the projection lens 16. The light reaching the projection lens 16 is guided through the projection lens 16 and condensed, and the collected light is emitted as spot light from the projection lens 16 in the irradiation direction of the headlamp 8.

  In the heat dissipation system of the present embodiment, heat generated when the LED light source 1 emits light moves to the heat sink 6 via the mount plate 12 on which the LED light source 1 is mounted, and is dissipated from the heat sink 6 into the atmosphere.

  In this case, as in the first embodiment, the reflector 13 and the heat sink 6 are arranged close to each other to concentrate each other's weights, and the structure has improved vibration resistance against external vibrations. At the same time, the headlamp 8 is thinned in the depth direction.

  FIG. 4 is an explanatory diagram when the headlamp 8 of this embodiment is attached to a two-wheeled vehicle. Also in this case, as in the first embodiment, the headlamp 8 is attached in the front-rear direction of the two-wheeled vehicle in the range from the front wheel rotation center of the two-wheeled vehicle to the upper end of the front fork 9.

  At this time, the heat sink 6 is heavy, and the overall weight of the headlamp 8 provided with the heat sink 6 is further increased. By making such a heavy headlight 8 close to the center of gravity of the two-wheeled vehicle in particular, the rotational moment of the two-wheeled vehicle is reduced, handling lightness is improved, and it contributes to safe driving and comfortable driving. became.

  At the same time, the lightness of handling during traveling is improved, contributing to safe traveling and comfortable traveling.

  Further, the headlamp 8 is attached to the two-wheeled vehicle so that the longitudinal direction of the heat sink 6 is substantially parallel to the front fork 9. As a result, the center of gravity of the thinned headlamp 8 can be brought closer to the rotation center axis of the front fork 9, and the rotational moment can be reduced to improve handling, maneuverability, stability, and the like.

  Further, by concentrating the weight of the reflector 13 and the heat sink 6, the impact resistance and vibration resistance against the impact and vibration during traveling of the two-wheeled vehicle are enhanced, and the occurrence of problems due to the impact and vibration is suppressed. The headlamp 8 is highly reliable.

  Furthermore, the heat sink 6 is located outside the reflector 13, and convection due to traveling wind passes through the surface of the heat sink 6 when the two-wheeled vehicle travels, and heat on the surface of the heat sink 6 is forcibly dissipated to improve heat dissipation efficiency. .

It is a fragmentary sectional view of Example 1 concerning the present invention. It is explanatory drawing which shows the state which attached Example 1 concerning this invention to the two-wheeled vehicle. It is sectional drawing of Example 2 concerning this invention. It is explanatory drawing which shows the state which attached Example 2 concerning this invention to the two-wheeled vehicle. It is a side view which shows schematic structure of a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Light source 1a Main light emission surface 2 Sub reflector 2a Elliptic surface 2b Elliptic reflecting surface 3 Main reflector 3a Parabolic surface 3b Parabolic reflecting surface 4 Lens 5 Circuit board 6 Heat sink 7 Housing 8 Headlamp 9 Front fork 10 Fender 11 Headlamp support member 12 Mount plate 13 Reflector 14 Shield 15 Lens holder 16 Projection lens 17 Aspherical reflecting surface 18 Lamp chamber 19 Wheel 20 Lamp unit

Claims (6)

At least inside the lamp chamber formed by the lens and housing,
An LED light source;
A substrate on which the LED light source is mounted;
A heat sink to which the substrate is attached;
A first reflector having a first reflecting surface for reflecting light from the LED light source;
A second reflector having a second reflecting surface for reflecting the reflected light from the first reflecting surface;
A two-wheeled vehicle headlamp comprising a lens that transmits reflected light from the second reflecting surface and emits the light toward the front of the lamp,
The two-wheeled vehicle headlamp, wherein the heat sink is positioned in the vicinity of the second reflecting surface of the second reflector on the side opposite to the second reflecting surface.   The first reflecting surface is an elliptical reflecting surface whose first focus is the position of the light source, and the second reflecting surface is a parabolic reflection whose focal point is the second focus of the elliptical reflecting surface. The headlight for a motorcycle according to claim 1, wherein the headlight is a surface.   The said 1st reflector and the said 2nd reflector are respectively located in the different side on both sides of the plane containing the straight line which connects the said 1st focus and the said 2nd focus. Motorcycle headlights.   The front for two-wheeled vehicle according to any one of claims 1 to 3, wherein the headlight for the two-wheeled vehicle is mounted in a range from a front wheel rotation center of the two-wheeled vehicle to an upper end of a front fork in a front-rear direction of the two-wheeled vehicle. Lighting. At least inside the lamp chamber formed by the lens and housing,
An LED light source;
A substrate on which the LED light source is mounted;
A mount plate to which the substrate is attached;
A heat sink integrally attached to the mount plate;
A reflector having a reflecting surface for reflecting light from the LED light source;
A shield that shields part of the reflected light from the reflective surface;
A two-wheeled vehicle headlamp comprising: a projection lens held by a lens holder that transmits the reflected light that has passed through the shield and emits the light toward the front of the lamp;
The two-wheeled vehicle headlamp, wherein the heat sink is located in the vicinity of a surface opposite to the reflecting surface of the reflector.   6. The two-wheeled vehicle headlamp according to claim 5, wherein the two-wheeled vehicle headlamp is attached in a longitudinal direction of the two-wheeled vehicle in a range from a front wheel rotation center of the two-wheeled vehicle to an upper end of a front fork.

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