JPH03254001A - Projector lamp device - Google Patents

Abstract

PURPOSE:To cast light forward effectively by coupling the front end opening of a reflex mirror with a convex lens through a cylindrical lamp body, forming the inner surface so as to function as a light reflecting face, and providing an aid reflex plate overhanging as tapered to the periphery of the front end opening. CONSTITUTION:Light beams from a light source 14 at No.1 focal point f1 reflected by a reflex mirror 12 is converged at No.2 focal point f2 situated ahead and led therefrom toward a convex lens 16. When passing through this convex lens 16, the light will become parallel beams to be cast ahead. Those beams of light emitted from the light source which are reflected toward positions set off from the focal point f2 are introduced to the front end opening of a lamp body 13 while repeating reflections at its light reflecting face, and are cast into the convex lens 16. Because a ring-shaped aid reflex plate 18 overhanging ahead as tapered is provided on the radial direction outside of the convex lens 16, the reflected light refracted outward in radial direction when passing thorugh the convex lens 16 is reflected by the aid reflex plate 18 and led forward.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a projector lamp device 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, in place of this headlamp, a so-called projector lamp has been developed in which the reflecting mirror has an elliptical cross section. In this projector lamp, a halogen bulb is arranged at the first focal point of a reflecting mirror having an elliptical cross section, and a convex lens is arranged so that the light reflected by the reflecting mirror is focused at a second focal point, and the halogen bulb The structure is such that the light from the bulb is projected forward through a convex lens.

A projector lamp with such a configuration uses a convex lens to convert the light from the halogen bulb concentrated at the second focal point into parallel light and send it forward, resulting in less light diffusion than a conventional headlamp that uses a parabolic mirror. This improves the illumination intensity of the road surface.

Moreover, even when emitting the same amount of light, the diameter of the reflecting mirror is smaller than that of a headlamp using a parabolic mirror, which has the advantage that the headlamp itself can be made smaller in diameter.

[Problems to be Solved by the Invention] However, even in this type of projector lamp, not all of the light from the halogen bulb is directed forward, and there is some wasted light that is not directed forward.

That is, among the light from the halogen bulb, the light reflected toward a position away from the second focal point is absorbed by the surrounding wall covering between the front end opening of the reflecting mirror and the convex lens before reaching the convex lens. or leak to the outside,
The light could not be directed forward.

Therefore, there is still room for improvement in terms of increasing irradiation efficiency.

The present invention was made based on these circumstances, and
The purpose of the present invention is to provide a projector lamp device that can further improve irradiation efficiency by taking advantage of the original characteristics of a lamp, such as being able to irradiate bright and uniform light over a long distance.

[Means for Solving the Problems] Therefore, in the present invention, the front end opening of the reflecting mirror and the convex lens are connected by a cylindrical lamp body, and the inner surface of this lamp body is made into a light reflecting surface. Along with forming;
A ring-shaped auxiliary reflector is provided on the peripheral edge of the front end opening connected to the convex lens of the lamp body, and extends in a tapered shape radially outward of the convex lens, and reflects the light incident on the convex lens from the light reflecting surface toward the front. It is characterized by having the following.

[Function] According to this configuration, the light directed from the light source toward the reflecting mirror is reflected by the reflecting mirror and then concentrated at the second focal point in front, and
From here, the light is guided toward a convex lens, and when passing through this convex lens, it becomes parallel light and is projected forward.

Also, among the light from the light source, the light reflected toward a position away from the second focal point is repeatedly reflected on the light-reflecting surface of the lamp body, and is guided to the front end opening of the lamp body, where it enters the convex lens. It is incident. In this case, there is a ring-shaped auxiliary reflector that tapers forward on the outside of the convex lens in the radial direction, so that the reflected light is refracted radially outside when passing through the convex lens. teeth,
After being reflected by an auxiliary reflector, it is guided forward.

Therefore, the light from the light source can be effectively guided forward without waste, and the irradiation efficiency can be increased accordingly.

[Example] The present invention will be described below based on an example shown in the drawings.

FIG. 3 shows a motorcycle equipped with a projector lamp, and numeral 1 in the figure is a frame. A front fork 3 is pivotally supported on a steering Radvib 2 at the front end of the frame 1, and a front wheel 4 is supported at the lower end of the front fork 3.

An instrument panel 5 is arranged in front of the steering head vibe 2, and the area from the instrument panel 5 to the periphery of the engine 6 is covered by a cowling 7. A headlamp 8 is built into the front of the cowling 7, and this headlamp 8 is located below the instrument panel 5.

Incidentally, the headlamp 8 uses a projector lamp 10 according to the present invention. Details of this projector lamp 10 are shown in FIGS. 1 and 2.

That is, the reference numeral 11 in the figure is a lamp body, and this lamp body 11 is composed of a reflecting mirror 12 and a hollow cylindrical lamp body 13 connected to the front end opening of this reflecting mirror 12. The reflecting mirror 12 has an elliptical vertical cross section, but the overall shape is not a simple rotation of this ellipse, but a compound ellipse in which the elliptical cross section is gradually changed in the horizontal direction. There is.

Such a reflecting mirror 12 has two focal points f and f2 on an optical axis coaxial with the lamp body 13. This first focal point f1 is located inside the reflecting mirror 12, and the second focal point f2 is located on the lamp body 13 which is outside the reflecting mirror 12.
It is located inside.

A halogen bulb 1 as a light source is installed at the rear end of the reflector 12.
4 is attached, and the filament 15 of this halogen bulb 14 is located at the first focal point f1.

A convex lens 16 is attached to the front end opening of the lamp body 13. This convex lens 16 is provided so as to focus the light reflected by the reflecting mirror 12 at a second focal point f2, and the convex lens 16
The light that gathers at the focal point f2 is irradiated forward.

Therefore, the lamp body 13 connects the reflecting mirror 12 and the convex lens 16, and the inner surface of the lamp body 13 is coated with a light reflecting surface 17 by applying a mirror finish, for example.
is formed.

A ring-shaped auxiliary reflector 18 that extends outward in the radial direction of the convex lens 16 is continuously provided at the opening periphery of the lamp body 13 on the convex lens 16 side. The auxiliary reflector 18 has a tapered shape that is inclined forward as it advances outward in the radial direction, so that the light that is refracted outward in the radial direction when passing through the convex lens 16 is directed forward. It is designed to reflect the light towards you.

In the low beam projector lamp 10, it goes without saying that a shielding plate is installed at or near the second focal point to block light passing below the second focal point. .

When the projector lamp 10 having such a configuration is turned on, the light from the filament 15 is reflected by the reflector 12 and then returns to the second focal point f2, as shown by the solid arrow in the m1 diagram.
gather at Then, when this light passes through the convex lens 16, it becomes parallel light rays and is projected forward.

On the other hand, the second focus f2 of the light from the filament 15
The light reflected toward the position away from the lamp body 13 is reflected by the light reflecting surface 17 of the lamp body 13, as shown by the broken line arrow in FIG.
The light is guided to the front end opening of the lamp body 13 while repeating total reflection, and is incident on the convex lens 16.

In this case, on the radially outer side of the convex lens 16, there is a ring-shaped auxiliary reflector 18 that projects forward in a tapered shape, so that when passing through the convex lens 16, the light is refracted radially outward. The reflected light is reflected by the auxiliary reflection plate 18 and guided forward together with the light gathered at the second focal point f2.

Therefore, by taking advantage of the original features of the projector lamp 10, such as being able to effectively guide the light from the filament 15 forward without waste and emitting bright, uniform light to a long distance, it is possible to further improve the irradiation efficiency. can.

In addition, in the above embodiment, a halogen bulb was used as the light source, but the present invention is not limited to this, and for example, a metal halide lamp may be used.

Furthermore, the projector lamp according to the present invention is not limited to use in motorcycles, but can be applied to other vehicles such as passenger cars and snowmobiles, and can also be used not only as a headlamp but also as a fog lamp. It is.

[Effects of the Invention] According to the present invention described in detail above, the light reflected by the light reflecting surface of the lamp body is irradiated forward from the periphery of the convex lens, so that the light from the light source is not wasted in the forward direction. can be effectively guided.

Therefore, it is possible to further improve the irradiation efficiency by taking advantage of the original feature of the projector lamp, which is the ability to irradiate bright and uniform light to a long distance.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention; FIG. 1 is a sectional view of a projector lamp, FIG. 2 is a sectional view taken along the line -■ in FIG. 1, and FIG. 3 is a side view of a motorcycle. 12...Reflector, 13...Lamp body 14...
・Light source (halogen bulb), 16... Convex lens, 17.
...Light reflecting surface, 18...Auxiliary reflecting plate, fl...First
Focus, f2...Second focus.

Claims (1)

[Claims] It has a reflecting mirror with an elliptical cross section, and a light source is placed at a first focal point inside this reflecting mirror, and a light source is placed in front of a second focal point where the light reflected by the reflecting mirror gathers. In a projector lamp device in which convex lenses are arranged so as to match each other, the front end opening of the reflecting mirror and the convex lens are connected by a cylindrical lamp body, and the inner surface of the lamp body is formed as a light reflecting surface. In addition, a ring-shaped auxiliary member is provided on the peripheral edge of the front end opening of the lamp body connected to the convex lens, tapering outward in the radial direction of the convex lens, and reflecting the light incident on the convex lens from the light reflecting surface toward the front. A projector lamp device characterized by being provided with a reflector.