JPH0528644Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a projector type automobile headlamp.

[Conventional technology]

Automobile headlights must have a light distribution pattern that brightly illuminates the area in front of the vehicle's own lane and does not dazzle oncoming vehicles.

A projector-type automobile headlamp has been proposed as a headlamp that has light distribution characteristics that meet the above requirements, has a simple lens configuration, and can be made compact in overall size. As the latest technology regarding this projector type headlamp, for example, Japanese Patent Application Laid-Open No. 58-209801 is known.

FIG. 3 shows the above-mentioned known projector type headlamp. The headlight of this known example is provided with a shell-shaped reflector, and the axial cross section of the inner reflective surface of this reflector each forms a part of an ellipse, and the eccentricity of the ellipse is perpendicular to the axial direction. In a vehicle headlamp increasing from the longitudinal section to the axially horizontal longitudinal section, the elliptical portion 10 of every axial section
The focal points 105 of 1,102 and the corresponding vertices 104 of the elliptical portions 101, 102 of all axial sections coincide.

110 is the outer focus of the ellipse 102, 110 is a light shielding plate-like dimmer, 112 is the outer focus of the ellipse 101,
113 is a lens.

FIG. 4 is a plan view schematically depicting an example of this type of projector type headlamp, FIG. 5 is a side view, and FIG. 6 is a front view.

1 is a concave mirror, and F is its focal point. The light source bulb 2 is provided so that the filament is located near the focal point F mentioned above.

A convex lens 3 is provided to share the optical axis Z with the concave mirror 1 described above.

I-j drawn in FIG. 4 indicate the meridional image plane of the convex lens 3, which emits light from the light source and passes through the concave mirror 1.
The light reflected by the lens enters this meridional image plane.

The above incident light is modulated by the convex lens 3 and projected forward (to the right in FIGS. 4 and 5).

When a screen is provided near the meridional image plane and the light distribution pattern is shown as an isoluminance curve, it becomes as shown in FIG. H-H is the horizontal line on the screen,
V-V is also a vertical line.

As shown in FIGS. 4 to 6, a shade 4 having an edge along the meridional image plane is provided. Specifically, as shown in 4a in FIG. 6, a cut line 4a is formed so as to recede downward from the horizontal section ij of the meridional image plane. FIG. 7 shows how the light distribution pattern described above and the shade 4 overlap. As shown in FIG. 7, the upper half of the light beam passes through. Although most of the lower half is blocked, light is allowed to pass through the portion corresponding to the cut line 4a.

As the partially covered light beams as described above are focused on the meridional image planes ij and intersect with each other, the light beams projected in front of the headlight have a pattern that is an inversion of the one shown in FIG. 7. form. FIG. 8 is an explanatory diagram showing the general shape of a light projection pattern using isoluminance curves on a screen provided in front of the headlight.

This conventional example is configured for left-hand traffic, and in the case of right-hand traffic, the left and right sides of FIGS. 6 to 8 are configured to be opposite.

[Problem that the invention attempts to solve]

Although the above-mentioned FIG. 5 was a schematic diagram for explaining the principle of a projector type headlamp, FIG. 9 shows a sectional view of a conventional example of a practical projector type headlamp.

In FIG. 9, 1 is a concave mirror, 2 is a light source bulb, 3 is a convex lens, and 4 is a shade. A frame 5 fixedly supports the convex lens 3 and shade 4 relative to the concave mirror 1.

The light beam emitted from the light source bulb 2, reflected by the concave mirror 1, and refracted by the convex lens 3 is projected as follows:
The light axis is almost parallel to the arrow, and has the advantage of little scattering. As a result, as shown in Fig. 8, the central luminous intensity is high (100 lux or more), but the area 10 degrees below the horizontal line H-H is hardly illuminated. In other words, if this conventional projector type headlamp is installed on a car and illuminates the road in the direction of travel, it can brightly illuminate the road ahead without dazzling oncoming vehicles, but the area close to the car is hardly illuminated, resulting in a so-called dark area around the car's feet.

This idea was created in view of the above circumstances.
The present invention aims to provide a projector-type automobile headlamp that can slightly illuminate the area in front of the vehicle.

[Means for solving problems]

In order to achieve the above object, the projector type automobile headlamp of the present invention has a light source bulb installed near the focal point of the reflector, and the light emitted from the light source bulb is reflected by the reflector and shaded. In a projector-type automobile headlamp that is partially cut out and projects the reflected light forward by a convex lens, an auxiliary light source bulb is provided above the line connecting the lower end of the convex lens and the focal point of the convex lens and the axis of the convex lens. , an auxiliary light source bulb illuminates the area near the vehicle.

[Effect]

The light emitted from the auxiliary light source bulb provided at the above position is refracted downward by the convex lens, and can illuminate the area around the feet of the vehicle.

〔Example〕

FIG. 1 is a cross-sectional view showing one embodiment of the projector type automobile headlamp of the present invention. The headlight consists of a reflector (concave mirror) 1, a light source bulb 2 installed near the focal point of the reflector 1, and a frame 5 in front of the reflector 1.
The basic structure is the same as that of the conventional example shown in FIG. 9. In addition to the above configuration, this embodiment has a convex lens 3 and a shade 4 provided near the focal point F of the convex lens 3.
The auxiliary light source bulb 10 is provided between the convex lens 3 and above the optical axis Z of the convex lens 3.
It is attached to a hole 9 formed in the upper part of the housing 6 of the headlamp through a packing 11. In the figure, 7 is a front lens that covers the front opening of the housing 6, and 8 is a lens that is located between the front opening edge of the housing 6 and the outer periphery of the convex lens 3 so that the internal components of the headlight are not visible from the outside. It is a finisher that can be used.

With the above configuration, the light emitted from the light source bulb 2 provided near the focal point of the reflecting mirror 1 is transmitted through the shade 4.
After the cut line is adjusted, the light passes through the convex lens 3 and the front lens 7 and illuminates the front of the vehicle as before. However, the light emitted from the auxiliary light source bulb 10 is refracted by the convex lens 3 and is then emitted from the light source bulb 2. The area near your vehicle, that is, the area near your feet, is irradiated (see Figure 2). Therefore, it is possible to brightly illuminate areas near and far from the vehicle.

Note that the position of the auxiliary light source bulb 10 is similar to that of the convex lens 3.
The closer it is to or the higher it is, the closer the vehicle can be illuminated.In short, it is sufficient that it is above the line connecting the lower end of the convex lens 3 and the focal point F of the convex lens 3 and above the optical axis Z of the convex lens 3. Furthermore, the attachment of the auxiliary light source bulb 10 is also performed using the housing 6 as in the above embodiment.
However, the present invention is not limited to this, and may be attached to the frame 5.

[Effect of idea]

As detailed above, according to the projector type automobile headlamp of the present invention, by adding an auxiliary light source bulb, it is possible to illuminate a wide range from the feet of the own vehicle (the area near the own vehicle in front) to a far distance. , which can contribute to improving driving safety.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing one embodiment of a projector-type automobile headlamp according to the present invention, and FIG. 2 is an explanatory diagram showing the light path of the above-mentioned embodiment. FIG. 3 is an explanatory diagram of a known projector type headlamp.
4 to 6 show a conventional projector type headlamp, in which FIG. 4 is a plan view, FIG. 5 is a side view, and FIG. 6 is a front view. FIGS. 7 and 8 are charts showing the optical characteristics of the above-mentioned conventional example. FIG. 9 is a sectional view of a conventional example. 1... Concave mirror, 2... Light source bulb, 3... Convex lens, 4... Shade, 5... Frame, 10...
...Auxiliary light source bulb.

Claims (1)

[Scope of utility model registration request] A projector type in which a light source bulb is installed near the focal point of a reflecting mirror, and the light emitted from the light source bulb is reflected by the reflecting mirror and partially cut by a shade, and the reflected light is projected forward by a convex lens. In the automobile headlamp, an auxiliary light source bulb is provided above the line connecting the lower end of the convex lens and the focal point of the convex lens and the axis of the convex lens, and the auxiliary light source bulb illuminates the vicinity of the vehicle. headlights.