JPH0434801A - Projector lamp for vehicle - Google Patents

Abstract

PURPOSE:To effectively guide the light ray shaded by a screening plate as forward lighting by guiding the light ray which is directed to the side of a convex lens through the lower side of a focal point of the convex lens, toward an auxiliary lens, after it is reflected by a reflection surface of the screening plate, and by radiating the light ray through the auxiliary lens. CONSTITUTION:Among light rays emitted from the filament 26 of a halogen bulb 25, the light ray directed to a convex lens 27 through the lower side of a focal point f3 of the convex lens 27, is shaded by a screening plate 33, and upward light ray is threby cut. The screening plate 33 is tilted back and obliquely upward in the direction of the focal point f3, while the under surface of the screening plate 33 forms a light ray reflection surface 34 for reflecting the light ray passing the lower side of the focal point f3 in the direction of an auxiliary lens 32 which is on the lower side of the convex lens 27, and the light passing the lower side of the focal point f3 is radiated forward and obliquely downward through the auxiliary lens 32. The light shaded by the screening plate 33 is guided forward through the other light path than that for the light for low beam, and the light of a halogen bulb 25 can thus be used effectively, and radiation efficiency can be improved thereby.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a projector lamp for a vehicle that projects light reflected by a reflecting mirror having an elliptical cross section forward using a convex lens.

[Prior Art] Conventional headlamps for motorcycles have a reflector that is curved in a parabolic cross section, a so-called parabola.
A mirror is used, and a front lens is attached to the front end opening of this reflecting mirror.

In this headlamp, the light from the filament is converted into parallel light by the reflector and sent forward,
This parallel light is refracted by the front lens and distributed in an appropriate pattern.

Recently, a so-called projector lamp in which a reflecting mirror has an elliptical cross section has been developed as an alternative to the conventional headlamp, and has been put into practical use for motorcycles and four-wheeled vehicles.

As shown in FIG. 6, this projector lamp includes a reflecting mirror 1 having an elliptical cross section and an open front end. The reflecting mirror 1 has two focal points f+ and f2 on one optical axis, and the filament 3 of the halogen light bulb 2 is located at the first focal point f1 located inside the reflecting mirror 1.

Further, a lamp body 4 extending forward coaxially with the optical axis is connected to the open end of the reflecting mirror 1, and a convex lens 5 is attached to the front end of the lamp body 4. The focal point f3 of the convex lens 5 is shifted backward from the second focal point f2, where the light reflected by the reflecting mirror 1 gathers, in order to spread the light distribution. The structure is such that the collected light is projected forward.

In the low beam (downward) projector lamp, a shielding plate 6 is placed at the focal point f of the convex lens 5 to block light passing below the focal point f toward the convex lens 5. There is. The shielding plate 6 is arranged perpendicularly to the optical axis, and the upward light projected from the convex lens 5 is blocked by the shielding plate 6.

[Problems to be Solved by the Invention] However, in this low beam projector lamp, since the shielding plate 6 is present between the reflecting mirror 1 and the convex lens 5, the focal point f of the convex lens 5 is.

The light passing through the lower side of is blocked by the shielding plate 6,
It could not be used as a forward light.

In particular, in a projector lamp in which the focal point f3 of the convex lens 'X5 is shifted behind the second focal point f2, the shielding plate 6 is also shifted behind the second focal point f2, as shown by the broken line in FIG. Furthermore, even the highly efficient light that passes below the optical axis and heads toward the second focal point f2 after being reflected by the reflecting mirror 1 is blocked by the shielding plate 6.

Therefore, as shown by diagonal lines in FIG. 6, there is an efficient optical path a of the light from the lower side of the optical axis toward the second focal point f2, and a light path that passes from the upper side of the optical axis to the focal point f3 of the convex lens 5. optical path b
All light attempting to pass through the triangular area surrounded by There is a problem that.

The present invention was made based on these circumstances, and
An object of the present invention is to provide a projector lamp for a vehicle, which can effectively utilize light blocked by a shielding plate as forward irradiation light without wasting it, and can improve irradiation efficiency.

[Means for Solving the Problems] Accordingly, in claim 1, there is provided a reflecting mirror having an elliptical cross section with an opening at the front end, a light source is disposed at a first focal point inside this reflecting mirror, and the reflecting mirror is A convex lens is placed in front of the second focal point where the light reflected by the mirror gathers, so as to focus at the second focal point or at a position shifted toward the light source from the second focal point, and at the focal point of this convex lens, Assuming that the projector lamp for a vehicle is equipped with a shielding plate that blocks light passing below the focal point toward the convex lens side, an auxiliary lens is provided below the convex lens, and the shielding plate is connected from the convex lens side to the above. The shielding plate is arranged so as to be tilted rearward and upward as it advances toward the reflecting mirror, and the lower surface of the shielding plate is formed as a light reflecting surface that reflects the light passing below the focal point of the convex lens toward the auxiliary lens. There is.

According to a second aspect of the present invention, there is provided a reflecting mirror having an elliptical cross section with an open front end, and a light source is disposed at a first focal point inside the reflecting mirror, and a second focal point on which the light reflected by the reflecting mirror is collected. A convex lens is arranged in front of the focal point so as to focus at a second focal point or a position shifted toward the light source side from the second focal point, and a convex lens is placed at the focal point of this convex lens, passing under this focal point to the convex lens side. Assuming that the vehicle projector lamp is equipped with a shielding plate that blocks incoming light, the shielding plate is arranged so as to be tilted rearward and upward as it progresses from the convex lens side to the reflector side, and the lower surface of this shielding plate is placed above the convex lens. A light reflecting surface is formed to reflect downward the light passing below the focal point of the lens, and a light reflecting surface is formed between the reflecting mirror and the convex lens to guide the light reflected by the light reflecting surface above the focal point of the convex lens. At the rear, a plurality of auxiliary reflecting mirrors are provided which guide the light downwardly from there toward the convex lens.

[Function] According to the structure described in claim 1, the light passing below the focal point of the convex lens and heading toward the convex lens side is reflected by the light reflecting surface of the shielding plate and then guided toward the auxiliary lens. Illuminated forward through the lens.

For this reason, the light that was conventionally blocked by a shielding plate,
It can be effectively guided for illuminating the front without waste, and the irradiation efficiency can be increased accordingly.

According to the configuration described in claim 2, the light passing below the focal point of the convex lens toward the convex lens side is reflected by the light reflecting surface of the shielding plate, and then is repeatedly totally reflected between the plurality of auxiliary reflecting mirrors.
It is guided to the convex lens from above the focal point of the convex lens.

For this reason, the light that was conventionally blocked by a shielding plate,
The light can be projected forward and downward from the convex lens, and the amount of light projected from the convex lens can be increased without any loss in the anti-glare performance of the shielding plate.

[Embodiment] Hereinafter, a first embodiment of the present invention will be described based on FIGS. 1 to 3 in which the present invention is applied to a scooter type motorcycle.

The underbone-shaped frame indicated by reference numeral 11 in FIG. 3 is provided with a steering head vibe 12 at its front end. A front fork 14 is pivotally supported on the steering vibration 12 via a steering shaft 13, and this front fork 14 supports a front wheel 15.

A steering bar handle 16 is connected to the upper end of the steering shaft 13, and the bar handle 16 is covered with a hollow handle cover 17.

The front part of the frame 11 and the upper part of the front fork 14 are covered by a leg shield 19 that is integrated with the front fender 18, and the upper part of the leg shield 19 is continuous with the handle cover 17.

Incidentally, a headlamp 20 is incorporated into the front surface of the handle cover 17. A projector lamp 21 according to the present invention is used in this headlamp 20, and details of this projector lamp 21 will be explained below with reference to FIGS. 1 and 2.

That is, the projector lamp 21 includes a lamp body 22 having a cylindrical shape. The lamp body 22 includes a reflecting mirror 23 having an open front end and an oval cross section, and this reflecting mirror 23.
A cylindrical lamp body 24 connected to a front end opening of the lamp body 24 is arranged horizontally inside the handle cover 17 along the front-rear direction.

Although the reflecting mirror 23 has an elliptical vertical cross section, the overall shape is not a simple rotation of this ellipse, but a composite ellipse in which the elliptical cross section is gradually changed in the horizontal direction. I am doing it.

The reflecting mirror 23 has two focal points, first and second, fs and f2 on one optical axis passing through its center. The first focal point f is located inside the reflecting mirror 23, and the second focal point f2 is located inside the lamp body 24 outside the reflecting mirror 23.

At the rear end of the reflecting mirror 23, a halogen light bulb 2 is installed as a light source.
5 is attached, and the filament 26 of this halogen bulb 25 is located at the first focal point f1.

A convex lens 27 is attached to the front end opening of the lamp body 24. In this embodiment, the focal point f3 of this convex lens 27 coincides with the second focal point f2 where the reflected light reflected by the two reflecting mirrors 23 gathers, and the convex lens 27
The structure is such that the light converged at the second focal point f2 is projected forward.

Further, a light guide portion 30 is integrally formed on the lower surface of the front end of the lamp body 24 and projects downward as it advances forward. A light projecting opening 31 that opens obliquely downward in front is formed at the front end of the light guide section 30.
1 is attached with an auxiliary lens 32 having light diffusing properties.

The auxiliary lens 32 has a rectangular shape that is elongated in the left-right direction when viewed from the front, and is located immediately below the convex lens 27 and continuously. The convex lens 27 and the auxiliary lens 32 are exposed on the front surface of the handle cover 17.

A shielding plate 33 is arranged inside the lamp body 24 to obtain a low beam light distribution.

This shielding plate 33 is for blocking the light passing below the focal point f of the convex lens 27 toward the convex lens 27 side. It extends toward the focal point f3. Therefore, the shielding plate 33 is inclined backward and upward between the convex lens 27 and its focal point f3, and the lower surface of the shielding plate 33 facing the reflecting mirror 23 is, for example, finished with a mirror finish. It is formed on the light reflecting surface 34. The light reflecting surface 34, together with the slope of the shielding plate 33, is configured to reflect the light passing below the focal point f3 of the convex lens 27 toward the light guide section 30, and this reflected light is The light is irradiated diagonally downward and forward through the auxiliary lens 32.

According to such a configuration, among the light emitted from the filament 26 of the halogen bulb 25, the light that passes below the focal point f of the convex lens 27 and goes toward the convex lens 27 is directed to the shielding plate 3.
3, and the upward light projected from the convex lens 27 is cut.

In this case, the shielding plate 33 is tilted rearward and upward toward the focal point f3, and the lower surface of the shielding plate 33 directs the light passing below the focal point f to the auxiliary lens below the convex lens 27. 32, the light passing below the focal point f3 is reflected toward the auxiliary lens 3.
2, the light is irradiated diagonally downward to the front.

Therefore, the light blocked by the shielding plate 33 is guided forward through a different optical path from that of the low beam light.
The light emitted from the halogen bulb 25 can be used effectively for illuminating the front, and the irradiation efficiency can be increased accordingly.

Note that the present invention is not limited to the first embodiment described above, and FIG. 4 shows a second embodiment of the present invention.

In this second embodiment, the focal point f3 of the convex lens 27 is provided at a position shifted backward from the second focal point f2 of the reflecting mirror 23, and the shielding plate 33 for obtaining the mouth/beam light distribution is located on the lamp body. The focal point f3 of the convex lens 27 from the lower front end of the lens 24
It extends towards.

According to this second embodiment, since the focal point f of the convex lens 27 and the second focal point f2 of the reflecting mirror 23 are deviated from each other, as shown by the chain line in FIG. focus f
The light directed toward the second focal point is guided to the convex lens 27 without being blocked by the shielding plate 33, and the low beam light distribution is spread out compared to the case where the focal point f3 and the second focal point f2 coincide. I can do it.

Moreover, efficient light directed from the lower side of the optical axis toward the second focal point f2 is blocked by the shielding plate 33, and upward light projected from the convex lens 27 is cut off. however,
This blocked light is reflected by the light reflecting surface 34 on the lower surface of the shielding plate 33, is guided to the auxiliary lens 32 through the light guide portion 30, and is irradiated forward and diagonally downward through the auxiliary lens 32.

Therefore, even though the focal point f of the convex lens 27 is shifted behind the second focal point f2 and the low beam light distribution is broadened, the light beam passes through the lower side of the optical axis toward the second focal point f2. Efficient light can be used effectively for illuminating the road ahead, increasing the amount of light directed forward and expanding the irradiation range of the road surface.

Further, FIG. 5 discloses a third embodiment of the present invention.

In this third embodiment, the focal point f of the convex lens 27.

is shifted behind the second focal point f2, and after being reflected by the reflecting mirror 23, the focal point f.

A shielding plate 4 that blocks light passing through the lower side of the convex lens 27 toward the convex lens 27 side.
1 is placed. The shielding plate 41 is composed of a curved mirror 43 that is inclined backward and upward, and whose lower surface facing the reflecting mirror 23 forms a light reflecting surface 42.
3 reflects the light passing below the focal point f3 of the convex lens 27 toward the convex lens 27 downward.

A second curved mirror 44 is provided on the lower surface of the lamp body 24 so as to be located on the optical path of the light reflected by the curved mirror 43. The second curved mirror 44 is for reflecting the light reflected by the curved mirror 43 above the second focal point f2 as parallel light, and the second curved mirror 44 is for reflecting the light reflected by the curved mirror 43 as parallel light above the second focal point f2. A plane mirror 45 is provided on the top surface, located on the optical path of the light reflected by the second curved mirror 44 . This plane mirror 45 is for reflecting the light reflected by the second curved mirror 44 as parallel light from above the optical axis toward the convex lens 27 in front.
The light reflected by the lens 5 is projected diagonally downward and forward through the convex lens 27.

Further, inside the lamp body 24, there is a lens for blocking light that cannot be blocked by the shielding plate 41, that is, light that directly goes downward from the filament 26 of the /% rogen light bulb 25 to the second focal point f2 or the focal point f3. Three curved mirrors 46 are arranged. The third curved mirror 46 is for blocking the light directed toward the convex lens 27 and for reflecting this light as parallel light above the second focal point f2. A third curved mirror 46 is provided on the upper surface of 24.
A second plane mirror 47 is located on the optical path of the light reflected by the
is provided. This plane mirror 47 is the third curved mirror 4
This is to reflect the light reflected by the lens 6 as parallel light from above the optical axis toward the convex lens 27 in front.
The light reflected by the plane mirror 47 is projected diagonally downward and forward through the convex lens 27.

Therefore, the light passing below the focal point f3 of the convex lens 27 toward the convex lens 27 is reflected between the plurality of curved mirrors 43, 44, 46 and the plane mirror 45, 47, as shown by the broken line in FIG. After repeating, the convex lens 27 is inserted from above the optical axis.
These curved mirrors 4.3, 4
4.46 and plane mirror 45.47 constitute an auxiliary reflecting mirror.

According to the third embodiment having such a configuration, the light that was conventionally blocked by the shielding plate can be irradiated forward and diagonally downward from the convex lens 27 along with the original low beam light distribution, thereby preventing glare. It is possible to increase the amount of light projected forward without any loss in performance.

Therefore, as in the case of the first embodiment, the light emitted from the halogen bulb 25 can be effectively used for illuminating the front, and the irradiation efficiency is improved accordingly.

In each of the above embodiments, a halogen bulb was used as the light source, but the present invention is not limited to this, and a discharge lamp such as a metal halide lamp may be used instead of the halogen bulb.

Further, the projector lamp according to the present invention is not limited to use in motorcycles, and can of course be similarly applied to other vehicles such as four-wheeled vehicles and snowmobiles.

[Effects of the Invention] According to the structure of claim 1, the light blocked by the shielding plate is guided forward through an optical path different from that of the low beam light, so that the light emitted from the light source is , it can be used effectively for illuminating the front without waste, and the irradiation efficiency can be increased accordingly.

According to the structure of claim 2, the light blocked by the shielding plate is projected forward and downward through the convex lens together with the low beam light, so that the light emitted from the light source is used for illuminating the front without wasting it. It can be used effectively and the irradiation efficiency can be increased without any loss in anti-glare performance.

[Brief explanation of drawings]

1 to 3 show a first embodiment of the present invention, FIG. 1 is a sectional view of a projector lamp, FIG. 2 is a front view of the projector lamp, and FIG. 3 is a diagram of a scooter-type motorcycle. 4 is a sectional view of a projector lamp according to a second embodiment of the present invention; FIG. 5 is a sectional view of a projector lamp according to a third embodiment of the present invention; FIG. 6 is a conventional FIG. 3 is a cross-sectional view of the projector lamp of FIG. 23...Reflector, 25...Light source (halogen bulb),
27...Convex lens, 32...Auxiliary lens, 33.4
1... Shielding plate, 34.42... Light reflecting surface, 44.4
5.46.47...Auxiliary reflecting mirror (curved mirror, plane mirror). Applicant's agent Patent attorney Takehiko Suzue 23 --- S-Drilling machine 25 --- Haragushi jaguri 27 --- Convex lens 32 --- One coffin binding nose' 33---1 Shoji Ji Figure 3 Figure 2

Claims (1)

[Claims] 1. It has a reflecting mirror with an elliptical cross section with an open front end, and a light source is disposed at a first focal point inside the reflecting mirror, and a first focal point on which the light reflected by the reflecting mirror is collected. In front of the two focal points,
A convex lens is arranged so as to focus at this second focal point or a position shifted toward the light source from the second focal point, and the light passing below this focal point toward the convex lens is blocked at the focal point of this convex lens. In a vehicle projector lamp in which a shielding plate is arranged, an auxiliary lens is provided below the convex lens, and the shielding plate is arranged so as to be tilted backward and upward as it progresses from the convex lens side to the reflector side, and the shielding plate A projector lamp for a vehicle, characterized in that a lower surface of the convex lens is formed as a light reflecting surface that reflects light passing below the focal point of the convex lens toward an auxiliary lens. 2. It has a reflecting mirror with an elliptical cross section with an open front end, and a light source is placed at a first focal point inside this reflecting mirror, and in front of a second focal point where the light reflected by the reflecting mirror gathers.
A convex lens is arranged so as to focus at this second focal point or a position shifted toward the light source from the second focal point, and the light passing below this focal point toward the convex lens is blocked at the focal point of this convex lens. In a vehicle projector lamp in which a shielding plate is arranged, the shielding plate is arranged so as to be tilted backward and upward as it goes from the convex lens side to the reflector side, and the lower surface of the shielding plate passes below the focal point of the convex lens. A light reflecting surface is formed to reflect light downward, and between the reflecting mirror and the convex lens, the light reflected by the light reflecting surface is guided above the focal point of the convex lens, and then directed toward the convex lens. A projector lamp for a vehicle, characterized by being provided with a plurality of auxiliary reflectors that guide the lamp downward.