JP2821240B2 - Vehicle projector lamp - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle projector lamp that projects light reflected by a reflecting mirror having an elliptical cross section forward using a convex lens.

[Prior Art] A conventional motorcycle headlamp uses a so-called parabolic (parabolic) mirror having a parabolic cross section as a reflecting mirror, and a front lens is provided at an opening at a front end of the reflecting mirror. Installed.

In this headlamp, the light from the filament is converted into parallel light by the reflecting mirror and sent forward, and the parallel light is refracted by the front lens to distribute light in an appropriate pattern.

By the way, recently, as a substitute for the conventional headlamp, a so-called projector lamp in which a reflecting mirror is formed in an elliptical cross section has been developed, and has been put to practical use for motorcycles and four-wheeled vehicles.

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

Further, a lamp body 4 extending coaxially with the optical axis L and extending forward is connected to an opening end of the reflecting mirror 1, and a convex lens 5 is attached to a front end of the lamp body 4. Focus f ₃ of the convex lens 5, in order to give the spread the light distribution than the second focus f ₂ which light reflected by the reflecting mirror 1 are collected are offset rearwardly, the second focal point through the convex lens 5 the light collecting in f ₂ has a configuration that projects forward.

Then, in the low beam (downward) for the projection lamp, the focal point f ₃ of the convex lens 5, the shield plate 6 blocks light toward the convex lens 5 side through the lower side of the focal point f ₃ is arranged I have. The shielding plate 6 is arranged perpendicular to the optical axis L, and cuts upward light projected from the convex lens 5 by the shielding plate 6.

[Problems to be Solved] However, the projector lamp of this for low beam, due to the presence of the shield plate 6 between the reflector 1 and the convex lens 5, the lower side of the focal point f ₃ of the convex lens 5 Is blocked by the shielding plate 6 and cannot be used as forward irradiation light.

In particular, the projector lamp focus f ₃ of the convex lens 5 is shifted to the rear of the second focus f _2, the shielding plate 6 is also the second focus f ₂
To are shifted in the rear, as shown in FIG. 6 dashed, even efficient light toward the second focus f ₂ through the lower optical axis L after being reflected by the reflecting mirror 1 is , Is blocked by the shielding plate 6.

For this reason, as shown by oblique lines in FIG. 6, the efficient optical path a of the light from the lower side of the optical axis L to the second focal point f ₂ and the focal point f _{3 of the} convex lens 5 from the upper side of the optical axis L are set. The optical path b of the light passing through,
All the light that is going to pass through the triangular portion surrounded by the front surface of the shielding plate 6 will be blocked, and the spread of the light distribution is a hindrance in increasing the irradiation efficiency. Problem.

The present invention has been made in view of such circumstances, and a vehicle projector lamp capable of effectively using light blocked by a shielding plate as forward irradiation light without waste, and improving irradiation efficiency. The purpose is to provide.

Means for Solving the Problems In view of the above, in the first aspect, there is provided a reflecting mirror having an elliptical cross section with an open front end, and a light source is arranged at a first focus inside the reflecting mirror, and the reflection is performed. A convex lens is arranged in front of the second focal point where the light reflected by the mirror is gathered so as to focus on the second focal point or on a position shifted to the light source side from the second focal point. Assuming a vehicle projector lamp having a shielding plate that shields light going to the convex lens side through the lower side of the focal point, an auxiliary lens is provided below the convex lens, and the shielding plate is formed from the convex lens side. It is arranged so as to be inclined obliquely rearward upward as it goes to the reflecting mirror side, and the lower surface of this shielding plate is formed as a light reflecting surface that reflects light passing below the focal point of the convex lens toward the auxiliary lens. To have.

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 light for reflecting light reflected by the reflecting mirror is collected. A convex lens is arranged in front of the focal point so as to focus on the second focal point or on a position shifted to the light source side from the second focal point. The convex lens passes through the lower side of the focal point to the convex lens side. Assuming a projector lamp for a vehicle in which a shielding plate for shielding incoming light is arranged, the shielding plate is arranged obliquely rearward and upward as going from the convex lens side to the reflecting mirror side, and the lower surface of this shielding plate is
A light reflecting surface that reflects light passing below the focal point of the convex lens downward is formed between the reflecting mirror and the convex lens, and the light reflected by the light reflecting surface is above the focal point of the convex lens. After the light is guided, a plurality of auxiliary reflecting mirrors are provided to guide the convex lens downward from here.

[Operation] According to the configuration described in claim 1, light traveling toward the convex lens through the lower side of the focal point of the convex lens is guided toward the auxiliary lens after being reflected by the light reflecting surface of the shielding plate. The light is emitted forward through the lens.

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

According to the configuration described in claim 2, light traveling toward the convex lens side through the lower side of the focal point of the convex lens is reflected by the light reflecting surface of the shielding plate, and then is repeatedly subjected to total reflection between the plurality of auxiliary reflecting mirrors, The light is guided to the convex lens from above the focal point of the convex lens.

For this reason, the light conventionally blocked by the shield plate can be projected forward and downward from the convex lens, and the amount of light projected from the convex lens can be increased without impairing the anti-glare performance of the shield plate at all.

Embodiment A first embodiment of the present invention will be described below with reference to FIGS. 1 to 3 which are applied to a scooter type motorcycle.

The underbone-shaped frame denoted by reference numeral 11 in FIG. 3 has a steering head pipe 12 at its front end. The steering head pipe 12 has a steering shaft
A front fork 14 is pivotally supported via 13, and the front fork 14 supports a front wheel 15.

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

In addition, from the front part of the frame 11 to the upper part of the front fork 14, it is covered by a leg shield 19 integrated with a front fender 18.
The upper part of 19 is connected to the handle cover 17.

By the way, a head lamp 20 is incorporated in the front surface of the handle cover 17. The headlamp 20 uses a projector lamp 21 according to the present invention. Hereinafter, details of the projector lamp 21 will be described with reference to FIGS. 1 and 2. FIG.

That is, the projector lamp 21 includes a lamp main body 22 having a cylindrical shape. The lamp body 22 includes a reflector 23 having an elliptical cross section with an open front end, and a cylindrical lamp body 24 connected to an opening of the front end of the reflector 23,
It is arranged horizontally inside the handle cover 17 along the front-rear direction.

Although the vertical cross section of the reflecting mirror 23 is formed in an elliptical shape, as a whole, instead of simply rotating the ellipse, a compound ellipse in which the elliptical cross section is gradually changed in the horizontal direction is used. No.

The reflecting mirror 23 has first and second two focal points f ₁ and f ₂ on one optical axis L passing through the center thereof. This first focal point f ₁ is located inside the reflecting mirror 23, and the second focal point f ₂ is
Is located inside.

At the rear end of the reflector 23, a halogen bulb 25 as a light source is provided.
Is installed, the filament of this halogen bulb 25
26 is positioned in the first focal point f _1.

A convex lens 27 is attached to a front end opening of the lamp body 24. In the case of the present embodiment, the focal point f _{3 of the} convex lens 27 is the second focal point of the reflected light reflected by the reflecting mirror 23.
The focal point f ₂ coincides with the focal point f _2, and the light collected at the second focal point f ₂ is projected forward by the convex lens 27.

Further, on the lower surface of the front end of the lamp body 24, there is integrally formed a light guiding portion 30 which projects downward as it goes forward. At the front end of the light guiding section 30, an opening 31 for projecting light that opens diagonally forward and downward is formed.
An auxiliary lens 32 having a light diffusing property is attached.
The auxiliary lens 32 has a rectangular shape elongated in the left-right direction when viewed from the front, and is located immediately below the convex lens 27 continuously. And these convex lens 27 and auxiliary lens
32 is exposed on the front surface of the handle cover 17.

Inside the lamp body 24, a shielding plate 33 for obtaining a light distribution for a low beam is arranged. This shielding plate 33
Is for through the lower focal point f ₃ of the convex lens 27 blocks the light toward the convex lens 27 side, the shield plate 33 of this embodiment, the focus f ₃ from between the convex lens 27 and the auxiliary lens 32 Extending towards. Accordingly, the shielding plate 33, between the lens 27 and the focal point f _3, are inclined obliquely upward and rearward, the lower surface facing each other and the reflecting mirror 23 of the shield plate 33, for example, be subjected to a mirror finish Is formed on the light reflecting surface 34. Then, the light-reflecting surface 34, together with the inclination of the shielding plate 33, has become a light through the lower focal point f ₃ of the convex lens 27 to be reflected toward the light outlet portion 30, the reflected light The light is emitted obliquely downward and forward through the auxiliary lens 32.

According to such a configuration, among the light emitted from the filament 26 of the halogen lamp 25, the light toward the convex lens 27 passes through the lower focal point f ₃ of the convex lens 27 is shielded by the shielding plate 33, a convex lens 27 The upward light projected from is cut off.

In this case, the shielding plate 33, together with the inclined rearward and obliquely upward toward the focal point f _3, the lower surface of the shielding plate 33,
The light passing through the lower focal point f _3, since none of the light-reflecting surface 34 for reflecting toward the lower side of the auxiliary lens 32 of the lens 27,
Light passing through the lower focal point f ₃ is irradiated forward and obliquely downward through the auxiliary lens 32.

For this reason, the light blocked by the shielding plate 33 is guided forward through a different optical path from the light for the low beam,
The light emitted from the halogen bulb 25 can be effectively used for front lighting without waste, and the irradiation efficiency can be increased accordingly.

The present invention is not limited to the first embodiment, and FIG. 4 shows a second embodiment of the present invention.

In this second embodiment, the focus f ₃ of the convex lens 27 is the reflector 23
The second of the focal point f ₂ is provided at a position shifted backward, the shielding plate 33 for obtaining the B-beam light distribution, toward from the front end lower portion of the lamp body 24 to a focus f ₃ of the convex lens 27 extends the ing.

According to the second embodiment, as to the focus f ₃ of the convex lens 27 and the second focus f ₂ of the reflector 23 is shifted, as shown in FIG. 4 in dashed line, first from the upper side of the optical axis L light towards the second focus f _2, by guided to the convex lens 27 without being blocked by the shielding plate 33, as compared with the case where the focus f ₃ and the second focus f ₂ coincide, spread low beam light distribution Can be provided.

Moreover, good light from the lower efficiency toward the second focal point f ₂ of the optical axis L is shielded by the shielding plate 33, the upward light projected from the convex lens 27 is cut. However, the shielded light is reflected by the light reflecting surface 34 on the lower surface of the shielding plate 33, then is guided to the auxiliary lens 32 through the light guide unit 30, and is radiated obliquely downward forward through the auxiliary lens 32. You.

Therefore, the focal point f ₃ of the convex lens 27 is shifted to the rear of the second focal point f ₂ , and although the low-beam light distribution is expanded, the second focal point f ₂ passes below the optical axis L. The efficient light directed toward the front can be effectively used for forward illumination without waste, and accordingly, the amount of light guided forward can be increased and the irradiation range of the road surface can be expanded.

FIG. 5 shows a third embodiment of the present invention.

In the third embodiment, the focus f ₃ of the convex lens 27 is a second focal point
are offset to the rear of f _2, in the focus f _3, is reflected by the reflecting mirror 23, a shielding plate 41 for shielding light toward the convex lens 27 side through the lower side of the focal point f ₃ is arranged . The shielding plate 41 is inclined backward and obliquely upward, and includes a curved mirror 43 whose lower surface facing the reflecting mirror 23 forms a light reflecting surface 42. The curved mirror 43 has a focal point f _{3 of the} convex lens 27. Through the underside of the convex lens
The light directed to the 27 side is reflected downward.

On the lower surface of the lamp body 24, a second curved mirror 44 is provided on the optical path of the light reflected by the curved mirror 43. Second curved mirror 44 is for reflecting the parallel light and the light reflected by the curved mirror 43 over the second focus f _2, the lamp body located above the second focus f ₂
On the upper surface of 24, a plane mirror 45 is provided 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 L toward the front convex lens 27. The light reflected by the plane mirror 45 is It is projected obliquely downward through 27.

Further, inside the lamp body 24, there is light that cannot be completely shielded by the shielding plate 41, that is, the filament of the halogen bulb 25.
The third curved mirror 46 for shielding light directed downward direct the second focus f ₂ and the focal f ₃ is arranged from 26. Third curved mirror 46
Blocks the light going to the convex lens 27 and
Intended for reflecting the light parallel to the upper side of the focal point f _2, on the upper surface of the second lamp body 24 located above the focal point f _2, the optical path of the third light reflected by the curved mirror 46 , A second plane mirror 47 is provided. This plane mirror
47 is for reflecting the light reflected by the third curved mirror 46 as parallel light from above the optical axis L toward the front convex lens 27, and the light reflected by the plane mirror 47 is The light is projected obliquely downward and forward through the convex lens 27.

Therefore, the light toward the convex lens 27 passes through the lower focal point f ₃ of the convex lens 27, as shown in FIG. 5 in broken lines, reflected between the plurality of curved mirrors 43, 44, and 46 and the plane mirror 45 and 47 Are repeated, the light is guided from above the optical axis L toward the convex lens 27, and the curved mirrors 43, 44, 46 and the plane mirrors 45, 47 constitute an auxiliary reflecting mirror.

According to the third embodiment having such a configuration, the light conventionally blocked by the shielding plate can be radiated obliquely downward and forward from the convex lens 27 together with the original low beam light distribution. The amount of light projected forward can be increased without any loss of performance.

Therefore, similarly to the case of the first embodiment, the light emitted from the halogen bulb 25 can be effectively used for forward illumination without waste, and the irradiation efficiency is improved accordingly.

In each of the above embodiments, a halogen lamp is used as a light source. However, 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 lamp.

Further, the projector lamp according to the present invention is not specified for a motorcycle, and it is needless to say that the projector lamp can be similarly applied to other vehicles such as a four-wheeled vehicle and a snowmobile.

[Effect of the Invention] According to the configuration of claim 1, the light shielded by the shielding plate is guided forward through a different optical path from the light for the low beam, so that the light radiated from the light source is reduced. It can be effectively used for the front lighting without waste, and the irradiation efficiency can be increased accordingly.

According to the configuration of claim 2, the light shielded by the shielding plate is projected forward and downward through the convex lens together with the light for the low beam, so that the light emitted from the light source can be used for the front illumination without waste. It can be used effectively, and the irradiation efficiency can be increased without impairing the antiglare performance at all.

[Brief description of the 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 a projector lamp, and FIG. 3 is a view of a scooter type motorcycle. FIG. 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, and FIG. 1 is a sectional view of a projector lamp of FIG. 23 Reflector, 25 Light source (halogen bulb), 27 Convex lens, 32 Auxiliary lens, 33, 41 Shield plate, 34, 42
…… Light reflecting surface, 44, 45, 46, 47 …… Auxiliary reflecting mirror (curved mirror, plane mirror).

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-62-15701 (JP, A) JP-A-64-84501 (JP, A) JP-A-1-124602 (JP, U) JP-A-63 111704 (JP, U) (58) Field surveyed (Int. Cl. ⁶ , DB name) F21M 3/05

Claims (2)

(57) [Claims] A light source disposed at a first focus inside the reflector, and a second focus at which light reflected by the reflector is collected. Forward,
A convex lens is arranged so as to focus on the second focal point or a position shifted to the light source side from the second focal point, and the light of the convex lens is shielded from light passing through the lower side of the focal point toward the convex lens. In a vehicle projector lamp provided with a shielding plate, an auxiliary lens is provided below the convex lens, and the shielding plate is disposed to be inclined obliquely rearward and upward as going from the convex lens side to the reflecting mirror side. A lower surface of the projector lens formed on a light reflecting surface for reflecting light passing below the focal point of the convex lens toward the auxiliary lens. 2. A reflector having an elliptical cross section with an open front end, a light source disposed at a first focal point inside the reflector, and a second focal point at which light reflected by the reflector is collected. Forward,
A convex lens is arranged so as to focus on the second focal point or a position shifted to the light source side from the second focal point, and the light of the convex lens is shielded from light passing through the lower side of the focal point toward the convex lens. In a vehicle projector lamp provided with a shielding plate, the shielding plate is disposed to be inclined obliquely rearward and upward as going from the convex lens side to the reflecting mirror side, and the lower surface of the shielding plate passes below the focal point of the convex lens. While forming on the light reflecting surface that reflects light downward, 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, comprising a plurality of auxiliary reflecting mirrors directed downward.