CN102192456B - Projector headlamps for motorcycles - Google Patents

Abstract

A kind of motorcycle projector headlight, it has: the 1st reflecting surface; 2nd reflecting surface, it is configured near the outside of the openend of the 1st reflecting surface, makes to incide the 2nd reflecting surface from the light that light source radiation goes out, towards the light in the outside of the openend of the 1st reflecting surface; And diverging lens portion, it is configured on the direction of illumination from the reverberation of the 2nd reflecting surface, and diverging lens portion comprises: the light entrance face that the reverberation from the 2nd reflecting surface is incident; Exit facet, its diffused light reverberation from the 2nd reflecting surface inciding lens interior from light entrance face being become spread vertically and horizontally and penetrating, exit facet is configured to concave curved surface, this concave curved surface comprise in horizontal cross-section relative to major axis or minor axis symmetrical and to the oval circular arc of light entrance face lateral bend, further, comprise in vertical cross section in circle or ellipse, to circular arc, the elliptic arc of the side more top than the horizontal plane through circle or oval center and light entrance face lateral bend.

Description

Projector headlamps for motorcycles

technical field

The present invention relates to a projection type headlamp for motorcycles, in particular to a projection type headlamp for motorcycles capable of forming a bank light distribution pattern and an overhead light distribution pattern, wherein the bank light distribution The pattern is used to illuminate areas that become dark when the vehicle body is tilted, and the overhead light distribution pattern is used to illuminate signs and the like.

Background technique

Conventionally, in the field of headlights for motorcycles, there have been proposed projection type headlights configured as follows: when the vehicle body is tilted from an upright posture (see FIG. 17 (a)), The main light distribution pattern P1 of etc. is tilted (refer to FIG. 17 (b)), and a triangular area A (refer to FIG. )) is darkened, and the triangular area A is illuminated when the vehicle body is tilted (for example, Patent Document 1).

As shown in FIG. 18 , the projection headlamp 200 described in Patent Document 1 includes a low beam lamp 210 and turn lamps 220 arranged on the left and right sides of the low beam lamp 210 .

The low-beam lamp 210 is a headlamp unit configured to form a low-beam light distribution pattern P1 (refer to FIG. 19(a)), and as shown in FIG. Similarly, a projection lens 211, a light source 212, a reflection surface 213, a shade 214, and the like are provided.

According to this lamp 210 for low beam, part of the light emitted from the light source 212 and reflected on the reflection surface 213 is blocked by the lamp cover 214, and its image is projected by the projection lens 211, thereby forming a light distribution pattern for low beam. P1 (see FIG. 19( a )).

The turn signal lamp 220 is a headlamp unit capable of switching between the additional light distribution pattern P2 shown in FIG. 19( a ) and the additional light distribution pattern P3 shown in FIG. 19( b ). As shown in 20(b), it has a projection lens 221, a light source 222, and a reflection surface 223 like a general projection headlamp, but the lampshade 224 is different from a general projection headlamp.

That is, the cover 224 of the turn signal lamp 220 includes, in addition to the fixed cover 224a used in a general projection type headlamp, a movable cover 224b which is turned on/off in response to the operation switch of the direction indicator. Open and move between the light-shielding position shown in FIG. 20( b ) and the withdrawn position shown in FIG. 20( a ).

According to this turn signal lamp 220, when the operation switch of the direction indicator is turned off, part of the light radiated from the light source 222 and reflected on the reflection surface 223 is blocked by the movable shade 224b located at the light blocking position in FIG. 20(b), The image thereof is projected by the projection lens 221 to form an additional light distribution pattern P2 as shown in FIG. 19( a ). On the other hand, when the operation switch of the direction indicator is turned on, the movable lampshade 224b moves to the retracted position shown in FIG. The lampshade 224a blocks, and its image is projected by the projection lens 221 to form a light distribution pattern P3 as shown in FIG. 19(b). Thus, the darkened area when the vehicle body is tilted (the triangular area A surrounded by the horizontal line H-H and the upper edge of the low beam light distribution pattern P1 formed in an inclined state when the vehicle body is tilted, see FIG. 17(b)) For lighting.

Patent Document 1: Japanese Patent Laid-Open No. 2008-1306

However, in the projection type headlamp 200 for motorcycles with the above-mentioned structure, although it is possible to cover the region that becomes dark when the vehicle body is tilted (the upper end edge of the low beam light distribution pattern P1 formed obliquely with the horizontal line H-H when the vehicle body is tilted) The enclosed triangular area A is illuminated with reference to FIG. 17( b ). However, in addition to the lamp 210 for the low beam beam, two turn signals 220 are added in the structure, so there is a problem that the cost increases accordingly.

In addition, in the projection headlamp 200 having the above configuration, in order to form the overhead light distribution pattern for illuminating the sign and the like, an additional dedicated optical system has to be added, which further increases the cost.

Contents of the invention

The present invention has been accomplished in view of the above-mentioned circumstances, and its object is to constitute a region capable of forming a darkened area (main light distribution formed obliquely from the horizontal line when the vehicle body is tilted) at a lower cost than the prior art. The area enclosed by the upper edge of the pattern) is a projection type headlight for motorcycles with oblique light distribution patterns and overhead light distribution patterns for illumination.

In order to solve the above problems, the invention described in the first aspect of the present invention provides a projection type headlight for motorcycles, which has: a projection lens; a light source; a lampshade, which is arranged between the projection lens and the light source; The spheroidal first reflective surface has a first focal point set near the light source and a second focal point near the upper edge of the lampshade, and the motorcycle projection headlamp is configured as : A part of the light radiated from the light source and reflected on the first reflective surface is blocked by the lampshade, and its image is projected by the projection lens. The main light distribution pattern is formed on the vertical screen of the motorcycle. The projection type headlight for motorcycles is characterized in that it has: a second reflective surface, which is arranged near the outer side of the opening end of the first reflective surface, so that from the Among the light emitted by the light source, the light toward the outside of the opening end of the first reflective surface is incident on the second reflective surface; Directionally, the diffusion lens part includes: a light incident surface on which the reflected light from the second reflecting surface is incident; The reflected light on the surface is emitted as diffused light that diffuses up, down, left, and right, and the outgoing surface is configured as a concave curved surface. An elliptical arc with a curved side or a curve corresponding to the elliptical arc, and, in a vertical section, includes the side of the circle or ellipse that is higher than the horizontal plane passing through the center of the circle or ellipse and the A circular arc, an elliptical arc, or a curve corresponding to the curved arc or elliptical arc on the light incident surface side.

According to the invention described in the first aspect, by using the diffuser lens part (that is, without adjusting Using a plurality of lamps), it is possible to form an oblique light distribution pattern and an overhead light distribution pattern for illuminating an area that becomes dark when the vehicle body is tilted.

That is, according to the invention described in the first aspect, there is no need for a plurality of lamps as in the prior art, and therefore, it is possible to configure a light distribution pattern capable of forming an oblique light distribution pattern and an overhead light distribution pattern at a correspondingly lower cost than in the prior art. Projector headlights for motorcycles.

The invention described in claim 2 is characterized in that, in the invention described in claim 1, the second reflective surface is configured as a concave reflective surface, and the concave reflective surface is set at the light source in a horizontal section including the first focal point. Nearby, the second focus is set on an elliptical arc near the exit surface or a curve corresponding to the elliptical arc, and a parabola whose focus is set near the light source or a curve corresponding to the parabola is included in the vertical section curve.

According to the invention described in claim 2, through the action of the second reflective surface, it is possible to convert the light emitted from the light source toward the outside of the opening end of the first reflective surface into parallel light in a vertical cross section and Light converging at the center in a horizontal section. Moreover, since the second focal point of the second reflection surface is set near the exit surface, even when the diffusion lens unit is downsized relative to the projection lens, the converted light can be reliably incident on the diffusion lens. lens. In addition, since the diffusion lens unit can be miniaturized, it is possible to secure a large effective area of the projection lens with respect to the diffusion lens unit.

The invention described in the third aspect is characterized in that, in the invention described in the first or second aspect, the shape of the exit surface is adjusted such that a light distribution pattern including a top-mounted light distribution pattern is formed above the main light distribution pattern. and an additional light distribution pattern of an oblique light distribution pattern arranged on the left and right sides of the overhead light distribution pattern, wherein the oblique light distribution pattern is used to obliquely form the main body when the horizontal line and the vehicle body are inclined. The area surrounded by the upper edge of the light distribution pattern is illuminated.

According to the invention described in claim 3, by using the diffuser lens part (that is, without adjusting By using a plurality of lamps), it is possible to form an additional light distribution pattern including an oblique light distribution pattern for illuminating a region that becomes dark when the vehicle body is tilted and a light distribution pattern for overhead installation.

That is, according to the invention described in claim 3, since a plurality of lamps in the prior art are not required, the projection type headlight for motorcycles can be configured at a correspondingly lower cost than in the prior art.

The invention described in claim 4 is characterized in that, in the invention described in any one of claims 1 to 3, the shape of the emission surface is adjusted so that it is 10° to the left 10° to the right relative to the vertical line. , and within the rectangular range of 1°-4° above the horizontal line, forming a light distribution pattern for overhead installation, and at 10°-45° left and 10°-45° right relative to the vertical line, and relative to The horizontal line is within the rectangular range of 1°-4° above, forming a left-sloping light distribution pattern and a right-sloping light distribution pattern.

According to the invention described in claim 4, by using the diffuser lens part (that is, without adjusting Using multiple lamps), it is possible to form a light distribution pattern for overhead installation within a rectangular range that is 10° to 10° to the left of the vertical line and 1° to 4° above the horizontal line. The vertical line is within the rectangular range of 10°-45° to the left and 10°-45° to the right, and is 1°-4° above the horizontal line, forming a left-sloping light distribution pattern and a right-sloping light distribution pattern.

The invention according to claim 5 is characterized in that, in the invention according to any one of claims 1 to 3, the diffusion lens unit is integrally formed with the projection lens.

According to the invention described in claim 5, since the diffusion lens unit is integrally formed with the projection lens, it is possible to prevent mounting errors of the diffusion lens unit and reduce man-hours for mounting the diffusion lens unit.

The invention described in claim 6 is characterized in that, in the invention described in any one of claims 1 to 5, the second reflective surface is arranged near the lower outer side of the opening end of the first reflective surface, so that from Among the light emitted from the light source, the light directed toward the lower outside of the opening end of the first reflective surface is incident on the second reflective surface, and the diffusion lens portion is arranged for irradiation of the reflected light from the second reflective surface. Directionally, an opening through which reflected light from the second reflective surface passes is formed on the lampshade.

According to the invention described in claim 6, it is possible to provide a projector-type headlight for motorcycles in which the diffuser lens portion is arranged below the first reflection surface and is beautiful in appearance.

According to the present invention, at a lower cost than in the prior art, it is possible to configure a main distribution such as a region that can be darkened when the vehicle body is tilted (a light distribution pattern for low beam beams formed by a horizontal line and a tilted state when the vehicle body is tilted). The area enclosed by the upper edge of the light pattern) is a projection type headlight for motorcycles with an oblique light distribution pattern and a light distribution pattern for overhead lighting.

Description of drawings

FIG. 1 is a perspective view of a motorcycle projector headlamp 100 according to an embodiment of the present invention (the lamp cover 14 is omitted).

FIG. 2 is a vertical cross-sectional view of the motorcycle projector headlamp 100 shown in FIG. 1 .

(a) in FIG. 3 is used to explain the overhead light distribution pattern P2 _OH , oblique light distribution pattern P2 _B , and low beam light distribution formed by the motorcycle projection headlamp 100 shown in FIG. 1 . The diagram of the pattern P1 (in the upright posture of the vehicle body), (b) is a diagram for explaining the overhead light distribution pattern P2 _OH , the oblique light distribution pattern P2 _B , and the low beam light distribution pattern P1 (in the oblique state).

FIG. 4 is a plan view of the motorcycle projector headlamp 100 shown in FIG. 1 .

FIG. 5 is a vertical cross-sectional view of the motorcycle projector headlamp 100 shown in FIG. 1 .

(a) in FIG. 6 is a plan view of the projection lens 11 (including the diffusion lens portion 22) used in the motorcycle projection headlamp 100 shown in FIG. 1, (b) is a front view, and (c) is side view.

FIG. 7 is an enlarged view of the vicinity of the diffusion lens portion 22 .

8 is a diagram for explaining formation of additional light distribution pattern P2 by diffusing light Ray2 from second reflection surface 21 in the left-right direction by diffusing lens section 22 (horizontal cross-section of diffusing lens section 22 ).

(a) in FIG. 9 is a diagram schematically showing a state in which light rays Ray2 from the second reflection surface 21 are diffused in the vertical direction by the diffusion lens portion 22 (vertical cross section of the diffusion lens portion 22), and (b) It is a diagram (perpendicular cross-section of the diffusion lens portion 22 ) for explaining that the degree of diffusion in the vertical direction can be adjusted by adjusting the emission surface 22 b of the diffusion lens portion 22 .

10 is a diagram for explaining that by adjusting the shape of the outgoing surface 22b of the diffusion lens portion 22, the light Ray2 from the second reflection surface 21 is diffused in the left and right directions to form a uniform light distribution pattern.

11 is a diagram for explaining that by adjusting the shape of the output surface 22b of the diffusion lens portion 22, the light Ray2 from the second reflection surface 21 is diffused in the left and right directions to form a light distribution pattern in which the center is brighter than the sides.

Fig. 12 is a graph showing the illuminance of the area above the horizontal line obtained according to the standard (ECE Reg.113) (the upper limit illuminance of each area).

FIG. 13 is an example of the additional light distribution pattern P2 including the overhead light distribution pattern P2 _OH and the oblique light distribution pattern P2 _B.

FIG. 14 is a vertical cross-sectional view of Modification 1 of the motorcycle projector headlamp 100 shown in FIG. 1 .

FIG. 15 is a diagram for explaining a modified example of the projection lens 11 and the diffusion lens unit 22 .

FIG. 16 is a vertical cross-sectional view of Modification 2 of the motorcycle projector headlamp 100 shown in FIG. 1 .

(a) in FIG. 17 is a diagram for explaining the low beam light distribution pattern P1 (when the vehicle body is in an upright posture) formed by a conventional projection type headlamp for motorcycles, The low-beam light distribution pattern P1 (when tilted) formed by the projector headlamp for motorcycles and its problems are shown.

Fig. 18 is a plan view for explaining the structure of a conventional projector headlamp for motorcycles.

(a) in FIG. 19 is a diagram for explaining the additional pattern P2 and the low beam light distribution pattern P1 (when the vehicle body is in an upright posture) formed by the projection type headlight for motorcycles shown in FIG. 18 , and (b) ) are diagrams for explaining the additional light distribution pattern P2 and the low beam light distribution pattern P1 (when inclined).

(a) of FIG. 20 is a vertical sectional view of the turn signal lamp 220 shown in FIG. 18 , and (b) is a perspective view of the lamp cover 224 .

Label description

100: Projection headlights for motorcycles 10: Optical system for main light distribution

11: Projection lens 12: Light source

13: 1st reflective surface 14: Shade

14a: Opening 20: Additional optical system

21: Second reflection surface 22: Diffusion lens part

22a: Light incident surface 22b: Exit surface

22b _CH : circular arc 22b _CV : circular arc

22b1: Central lens surface 22b2: Lens surface

Detailed ways

Hereinafter, a motorcycle projection headlamp according to an embodiment of the present invention will be described with reference to the drawings.

As shown in FIGS. 1 and 2 , a motorcycle projection headlamp 100 according to the present embodiment includes a main light distribution optical system 10 and an additional optical system 20 .

[Optical system 10 for main light distribution]

The main light distribution optical system 10 is an optical system configured to irradiate light forming a low beam light distribution pattern P1 (see FIG. 3(a)), and as shown in FIG. 1 and FIG. The projection type headlamp has the following parts etc. equally: projection lens 11; Light source 12 (for example, halogen bulb, HID bulb); The focal point is set near the upper edge of the globe 14; and the globe 14 is disposed between the projection lens 11 and the light source 12 with its upper edge positioned near the focal point of the projection lens 11. In addition, in FIG. 1, the globe 14 is abbreviate|omitted for convenience of description.

According to this optical system 10 for main light distribution, as shown in FIG. By projecting an image, a light distribution pattern P1 for low beam beams is formed on a vertical screen arranged at a predetermined distance (about 25 m) ahead (see FIG. 3( a )).

[Additional Optical System 20]

The additional optical system 20 is an optical system configured to emit light for forming an additional light distribution pattern P2 including an overhead light distribution pattern P2 _OH for illuminating a sign or the like, and It is used to darken the area when the vehicle body is tilted (the triangular area A surrounded by the upper edge of the light distribution pattern P1 formed by the horizontal line HH and the low beam beam formed in an inclined state when the vehicle body is tilted, refer to FIG. 3(b)) The oblique light distribution pattern P2 _B of illumination, and as shown in FIGS. 1 and 2 , this additional optical system 20 has a second reflection surface 21, a diffusion lens portion 22, and the like.

As shown in Fig. 1 and Fig. 2, the second reflective surface 21 is disposed near the upper outer side of the opening end of the first reflective surface 13, so that among the light emitted from the light source 12, the light directed toward the upper outer side of the opening end of the first reflective surface 13 Light Ray2 (light Ray2 that does not enter the first reflection surface 13 and is not used to form the low beam light distribution pattern P1 ) enters the second reflection surface 21 . In addition, the second reflective surface 21 may be integrally formed with the first reflective surface 13 or formed separately from the first reflective surface 13 .

As shown in FIGS. 4 and 5 , the second reflective surface 21 is, for example, constituted as a concave reflective surface. In the horizontal section, the concave reflective surface includes that the first focal point F1 is set near the light source 12 and the second focal point F2 is set at An elliptical arc _CH near the exit surface 22b (or near the incident surface 22a) (refer to FIG. 4 ) or a curve corresponding to the elliptical arc _CH , and a parabola whose focus F is set near the light source 12 is included in the longitudinal section. C _V (see FIG. 5 ) or a curve corresponding to this parabola C _V.

More specifically, as shown in FIGS. 4 and 5, the second reflective surface 21 is configured as a curved surface formed by setting the first focal point F1 _A near the light source 12, and the second focal point F2 _A being set near the light source 12. _The elliptical arc (included in the horizontal section _AA of the spheroid a shown in FIG. Set the same plurality of elliptical arcs between the elliptical arcs near the exit surface 22b (included in the horizontal section BB of the rotating elliptical reflective surface b shown in Figure 5), and use the parabola C _V (refer to Figure 4) The above-mentioned curved surface is formed by connecting the plurality of elliptic arcs.

As shown in FIG. 5 , according to the second reflective surface 21, the light Ray2 directed toward the upper outer side of the opening end of the first reflective surface 13 among the light emitted from the light source 12 can be converted into a parallel light in a vertical cross section and Light that converges at the center in a horizontal section. Furthermore, since the second focal point F2 (F2 _A , F2 _B ) of the second reflection surface 21 is set near the exit surface 22b, even when the diffusion lens unit 22 is reduced in size relative to the projection lens 11, the The converted light Ray2 can be reliably made incident on the diffusion lens unit 22 . Furthermore, since the diffusion lens unit 22 can be miniaturized, it is possible to secure a large effective area of the projection lens 11 with respect to the diffusion lens unit 22 .

As shown in FIGS. 6( a ) to 6 ( c ), for example, the diffusion lens unit 22 is integrally formed on the upper portion of the projection lens 11 (the area surrounded by the width W and the height H). Accordingly, it is possible to prevent mounting errors of the diffusion lens portion 22 and reduce man-hours for mounting the diffusion lens portion 22 .

The diffusion lens part 22 includes: a light incident surface 22a on which the reflected light Ray2 from the second reflecting surface 21 is incident; It emits as diffused light that diffuses up, down, left, and right.

Moreover, the part 22b3 (refer FIG. 6(a)) of the left and right outer sides of the diffusion lens part 22 is a so-called connection part provided mainly for the reason of a molding. Regarding the height dimension H (refer to FIG. 6(a)) of the diffusion lens part 22, when considering the illuminance etc. calculated according to the standard (ECE Reg. 10mm. The diffusion lens portion 22 is arranged at the same height as the second reflective surface 21 so that the reflected light (parallel light rays) from the second reflective surface 21 enters the light incident surface 22a substantially perpendicularly.

In consideration of formability, the light incident surface 22a is configured as a vertical surface. In addition, the light incident surface 22a may be a surface other than a vertical surface.

FIG. 7 is an enlarged view of the vicinity of the diffusion lens portion 22 .

The outgoing surface 22b is configured as a concave curved surface (concave lens surface) that includes an elliptical arc 22b that is bilaterally symmetrical with respect to the major axis or the minor axis in a horizontal cross section and that is curved toward the light incident surface 22a side. _CH (refer to FIG. 7 and FIG. 8 ) or a curve corresponding to the elliptical arc 22b _CH , and, in the longitudinal section, includes a circle or an ellipse that is higher than a horizontal plane that passes through the center C of the circle or ellipse. Circular arc 22b _CV (refer to FIG. 7, FIG. 9(a), FIG. 9(b)) that is curved on the light incident surface 22a side, an elliptical arc, or a curve corresponding to them.

According to this diffusion lens part 22, by adjusting the shape of the exit surface 22b, that is, by adjusting the elliptical arc 22b _CH included in the horizontal section or the curve corresponding to the elliptical arc 22b _CH (for example, adjusting the elliptical arc 22b _CH The shape/size of the basic ellipse) to adjust the degree of diffusion of the incident light Ray2 as parallel light in the left and right directions (see FIG. 8, FIG. 10, and FIG. 11), and by adjusting the arc 22b _CV contained in the vertical section Or a curve corresponding to the arc 22b _CV (for example, adjusting the shape/size of the circle or ellipse as the basis of the arc 22b _CV ) to adjust the degree of diffusion of the light Ray2 incident as parallel light in the up and down direction (refer to FIG. 9( a), FIG. 9(b)), thereby, various light distribution patterns having different illuminance distributions can be formed (see FIG. 8 , FIG. 10 , and FIG. 11 ).

Fig. 12 is a diagram showing the illuminance of the region above the horizontal line H-H obtained according to the standard (ECE Reg.113) (the upper limit illuminance of each region).

In this embodiment, considering the upper limit illuminance shown in FIG. 12 and the triangular area A (see FIG. 3(b)) that becomes dark when the vehicle body is tilted, the following additional light distribution pattern is set as shown in FIG. 13 As the additional light distribution pattern P2, the additional light distribution pattern includes: overhead light distribution pattern _P2OH (illuminance: below 1.08Lx); and oblique light distribution arranged on the left and right sides of overhead light distribution pattern _P2OH The patterns P _2B (illuminance: about 2Lx) are used to illuminate the triangular area A (see FIG. 3( b )) that becomes dark when the vehicle body is tilted.

Then, the elliptical arc 22b _CH included in the horizontal section or the curve corresponding to the elliptical arc 22b _CH is adjusted (for example, the shape/size of the ellipse that is the basis of the elliptical arc 22b _CH is adjusted), and the vertical The arc 22b _CV contained in the section or the curve corresponding to the arc 22b _CV is adjusted (for example, adjusting the shape/size of the circle or ellipse that is the basis of the arc 22b _CV ) so that it is arranged at a predetermined distance in front (approx. On the vertical screen at 25 m), the additional light distribution pattern P2 shown in FIG. 13 is formed above the low beam light distribution pattern P1, thereby adjusting the shape of the exit surface 22b.

As shown in FIG. 8, according to the diffuser lens unit 22 adjusted as above, the reflected light Ray2 from the second reflective surface 21 entering the diffuser lens unit 22 moves up and down by the center lens surface 22b1 of the output surface 22b. Diffusion to the left and right, within the rectangular range of 10° to 10° to the left with respect to the vertical line VV, and 1° to 4° above the horizontal line HH, to meet the illuminance obtained according to the standard (ECE Reg.113) Light distribution pattern P2 _OH for overhead installation (illuminance: 1.08Lx or less) (see Figure 13).

And, according to the diffusion lens part 22 after the above adjustment, as shown in FIG. Under the action of the lens surface 22b2 on the side, diffusion occurs up, down, left, and right (especially in the left and right direction, large diffusion occurs). Within the rectangular range of 1° to 4° above the horizontal axis, a left-sloping light distribution pattern P2 _B (and a right-sloping light distribution pattern P2 _B ) brighter than the overhead light distribution pattern P2 _OH (illuminance: 1.08Lx or less) are formed , The illuminance of either side is: about 2Lx) (refer to Figure 13). With the left oblique light distribution pattern P2 _B (and the right oblique light distribution pattern P2 _B ), the triangular area A (see FIG. 3( b )) that becomes dark when the vehicle body is inclined is illuminated. Accordingly, it is possible to improve the visibility of the road surface, obstacles, and the like when the vehicle body is tilted.

As described above, according to the present embodiment, by using one of the adjusted shapes of the emission surface 22b (that is, the elliptical arc 22b _CH included in the horizontal section, the arc 22b _CV included in the vertical section, etc.) The diffusion lens portion 22 (that is, without using a plurality of lamps) can form an oblique light distribution pattern P2 _B (illuminance: about 2Lx ) and overhead light distribution pattern P2 _OH (illuminance: 1.08Lx or less) (see Figure 8). That is, according to the present embodiment, since a plurality of lamps 220 etc. (refer to FIG. 17 ) are not required as in the prior art, it is possible to configure an oblique light distribution pattern and an overhead lamp at a correspondingly lower cost than the prior art. A projector headlamp 100 for a motorcycle using a light distribution pattern.

Furthermore, according to the present embodiment, by using one diffuser lens unit 22 whose shape of the output surface 22b is adjusted (that is, the elliptical arc 22b _CH included in the horizontal section, the arc 22b _CV included in the vertical section, etc.) (That is, without using a plurality of lamps), it is possible to form a light distribution pattern within a rectangular range that is 10° to 10° to the left of the vertical line VV and 1° to 4° above the horizontal line HH Diffusion overhead light distribution pattern P2 _OH (illuminance: 1.08Lx or less); and 10° to 45° to the left and 10° to 45° to the right of the vertical line VV, and 1° above the horizontal line HH Left oblique light distribution pattern P2 _B and right oblique light distribution pattern P2 _B diffused within a rectangular range of ~4° (illuminance of either: about 2Lx) (see FIG. 8 and FIG. 13 ).

Next, modified examples will be described.

In the above-mentioned embodiment, an example in which a halogen bulb or an HID bulb is used as the light source 12 of the optical system 10 for main light distribution has been described, but the present invention is not limited thereto. For example, as shown in FIG. 14 , LEDs may be used as the light source of the optical system 10 for main light distribution. In this case, the height dimension of the projector headlamp 100 can be reduced in size by applying the LED characteristic of emitting light only in the hemispherical direction and arranging the reflective surface 13 only on the upper side.

Furthermore, in the above-mentioned embodiment, the case where the diffusion lens portion 22 is integrally formed on the upper portion of the projection lens 11 has been described, but the present invention is not limited thereto. For example, the diffusion lens unit 22 and the projection lens 11 may be formed separately as shown in the cross section of the diffusion lens unit 22 and the projection lens 11 in FIG. 15 .

In addition, in the above-mentioned embodiment, the example in which the second reflection surface 21 is disposed near the upper outer side of the opening end of the first reflection surface 13 and the diffusion lens portion 22 is disposed on the upper portion of the projection lens 11 has been described, but the present invention is not limited to this. For example, as shown in FIG. 16 , the second reflective surface 21 may be disposed near the lower outside of the opening end of the first reflective surface 13 , and the diffusion lens unit 22 may be disposed below the projection lens 11 . At this time, it is preferable to form an opening 14a in the globe 14 through which the reflected light from the second reflection surface 21 that enters the inside of the diffusion lens portion 22 from the light incident surface 22a passes. Thereby, it is possible to provide a beautiful motorcycle projection headlamp in which the diffusion lens portion 22 is arranged below the first reflection surface 13 .

In addition, in the above-mentioned embodiment, the case where the optical system 10 for main light distribution is configured to emit light for forming the light distribution pattern P1 for low beam beam (see FIG. 3( a )) has been described, but the present invention is not limited thereto. . For example, the main light distribution optical system 10 may be an optical system configured to emit light for forming a high beam light distribution pattern. That is, the main light distribution pattern may be a light distribution pattern for high beams.

All aspects of the above-described embodiments are illustrative only. The present invention should not be limitedly interpreted by these descriptions. The present invention can be implemented in other various forms without departing from the spirit or main characteristics thereof.

Claims (5)

1. A projection type headlight for a motorcycle, which has: a projection lens; a light source; a lampshade, which is arranged between the projection lens and the light source; The focal point is set near the light source, the second focal point is set near the upper edge of the lampshade, and the projection type headlamp for motorcycle is configured to radiate from the light source and A part of the light reflected on the reflecting surface is blocked by the lampshade, and an image of the light reflected on the first reflecting surface and incident on the projection lens is projected by the projection lens. A main light distribution pattern is formed on a vertical screen arranged at a predetermined distance ahead, and the projection type headlight for motorcycles is characterized in that it has: The second reflective surface is disposed near the outside of the opening end of the first reflective surface so that, among the light emitted from the light source, the light toward the outside of the open end of the first reflective surface enters the second reflective surface. reflective surfaces; and a diffusion lens part arranged in the irradiation direction of the reflected light from the second reflecting surface, The diffusion lens part includes: a light incident surface on which reflected light from the second reflecting surface enters; The light is emitted as diffused light that diffuses up, down, left, and right, The outgoing surface is configured as a concave curved surface, and the concave curved surface includes an elliptical arc or a curve corresponding to the elliptical arc that is bilaterally symmetrical with respect to the major axis or the minor axis and curved toward the light incident surface side in a horizontal cross section. , and, in the vertical section, include a circle or an ellipse, a circular arc, an elliptical arc that is curved to the side above the horizontal plane that passes through the center of the circle or ellipse, and the light incident surface side, or equivalent to this Curves of circular arcs and elliptical arcs, The second reflective surface is configured as a concave reflective surface, and the concave reflective surface includes an elliptical arc or an equivalent in which the first focus is set near the light source and the second focus is set near the exit surface in a horizontal section. A curve corresponding to the elliptic arc, and a parabola whose focus is set in the vicinity of the light source or a curve corresponding to the parabola is included in the vertical section. 2. The projection type headlamp for motorcycles according to claim 1, wherein: The shape of the outgoing surface is adjusted such that an additional light distribution pattern including a top-mounted light distribution pattern and inclined light distribution patterns arranged on left and right sides of the top-mounted light distribution pattern is formed above the main light distribution pattern. A light distribution pattern, wherein the inclined light distribution pattern is used to illuminate the area surrounded by the upper edge of the main light distribution pattern formed obliquely when the horizontal line and the vehicle body are inclined. 3. The projection type headlamp for motorcycles according to claim 1, wherein: The shape of the exit surface is adjusted so that a light distribution pattern for overhead is formed within a rectangular range of 10° to 10° to the left relative to the vertical line and 1° to 4° above the horizontal line, and , forming a left-inclined light distribution pattern and a right-inclined light distribution pattern within a rectangular range that is 10° to 45° to the left and 10° to 45° to the right of the vertical line, and 1° to 4° above the horizontal line. 4. The projection type headlamp for motorcycles according to claim 1, wherein: The diffusion lens portion is integrally formed with the projection lens. 5. The projection type headlamp for motorcycles according to claim 1, wherein: The second reflective surface is arranged near the lower outer side of the opening end of the first reflective surface so that, among the light emitted from the light source, the light directed toward the lower outer side of the opening end of the first reflective surface is incident on the first reflective surface. 2nd reflective surface, The diffusion lens unit is arranged in the irradiation direction of the reflected light from the second reflective surface, An opening through which reflected light from the second reflective surface passes is formed in the globe.