JPH0834063B2 - Projector-type vehicle headlight - Google Patents

Description

The present invention relates to a projector-type vehicle headlamp.

B. Related Art As shown in FIG. 4, for example, a conventional projector-type vehicle headlight of this type includes a reflector 1 fixed inside a housing 10 and a light source provided at a focal position of the reflector 1. A discharge lamp 2, a condenser lens 3 arranged in front of the reflector 1, and a shade 4 arranged between the condenser lens 3 and the reflector 1. The front portion except the condenser lens 3 portion is for blindfolding. Is covered by the finisher 5. Then, the light from the discharge lamp 2 and the reflector 1 is emitted to the front of the vehicle through the condenser lens 3 and the lens 20 attached to the front portion of the housing 10. In addition, the shadow formed by the shade 4 is projected forward by the condenser lens 3, whereby the cut line (bright / dark boundary) is clarified, and the light distribution characteristic of the dimmer beam (downward) with almost no upward light leakage is obtained. I am trying.

C. PROBLEM TO BE SOLVED BY THE INVENTION By the way, in such a projector-type vehicle headlamp, since the prism is not formed in the lens 20 unlike the conventional vehicle headlamp, such a step difference of the prism is formed. There is no scattered light in the lateral direction of the vehicle (direction of 60 to 70 degrees) generated by the parts, and therefore the amount of light radiated to the vicinity of 2m to 3m in front of the vehicle is small and visibility is poor. Therefore, as a means for eliminating such inconvenience, JP-A-62-5701 discloses
An optical member is integrally formed above or below the reflector, and a part of the light from the discharge lamp is reflected by this optical member,
It is disclosed that the reflected light illuminates the front side of the vehicle.

However, this method has a problem that the amount of light originally reflected by the reflector, that is, the amount of light radiated to the front of the vehicle is reduced because the reflector is provided with an optical member.

A technical problem of the present invention is to increase the irradiation light amount to the front side of the vehicle without decreasing the irradiation light amount to the front of the vehicle.

D. Means for Solving the Problems Explaining FIG. 1 showing one embodiment, the present invention is
A reflector 1, a light source 2 arranged at a focal position of the reflector 1, a lens 3 for condensing light from the light source 2 and the reflector 1, and an irradiation light arranged between the condensing lens 3 and the reflector 1. The present invention is applied to a projector-type vehicle headlight including a shade 4 that produces a cut line. Then, the direct light from the light source 2 is incident, and the incident light is guided to the lateral end of the vehicle on the rear surface of the condenser lens 3.
The light guide plate 21 is provided so that the light emitted from the light guide plate 21 is transmitted through the lateral end portion of the condenser lens 3 to be radiated toward the front side of the vehicle, thereby solving the above technical problem.

E. Action The direct light of the light source 2 incident on the light guide plate 21 from the light source 2 is
The light is guided to the end portion of the rear surface of the lens 3 in the vehicle lateral direction, and this light is diffused by the condenser lens 3 and emitted to the front side of the vehicle. Therefore, the light amount toward the front side of the vehicle is increased without reducing the irradiation light amount toward the front of the vehicle.

It should be noted that although the drawings of the embodiments are used in the above D and E for explaining the present invention in order to make the configuration of the present invention easy to understand, the present invention is not limited to the embodiments.

F. Embodiment One embodiment of the present invention will be described with reference to FIGS.

FIG. 1 is a cross-sectional view of a projector-type vehicle headlamp according to the present invention as viewed from above the vehicle.

In the figure, a rotary parabolic reflector 1 is arranged in the rear part of the lamp housing 10, and a discharge lamp (light source) 2 integrated with the reflector 1 is arranged at the focal position of the reflector 1. The reflector 1 including the discharge lamp 2 is attached to the rear end of the lamp housing 10 by a support member 11.

In front of the reflector 1, a condenser lens 3 for condensing light from the discharge lamp 2 and the reflector 1 is arranged with its optical axis aligned with the optical axis of the reflector 1. The condenser lens 3 is connected to the reflector 1 via a gap holding member (not shown) and is attached to a lens holder 3 a supported by the lamp housing 10. A shade 4 for obtaining a clear cut line (bright / dark boundary) for the irradiation light is arranged between the reflector 1 and the condenser lens 3, and the shade 4 is attached to the spacing member.

A pair of resinous light guide plates 21 are arranged between the reflector 1 and the condenser lens 3 as shown in FIG. 2, and are held in the housing 10 by a holding member (not shown).
The front ends of the pair of light guide plates 21 (hereinafter, simply referred to as front ends) are located near both ends of the reflector 1 in the vehicle lateral direction, and the rear ends of the vehicle are located near both ends of the condenser lens 3 in the same direction. There is. Reference numeral 5 denotes a blind finisher supported by the lamp housing 10 by a supporting member (not shown) so as to cover the outer circumference of the condenser lens 3 and cover the opening of the lamp housing 10.

The irradiation light of the discharge lamp 2 and the reflection light of the reflector 1 are irradiated to the front of the vehicle through the condenser lens 3 and the lens 20 attached to the front part of the housing 10. On the other hand, the discharge lamp 2
Light directly incident on the light guide plate 21 without passing through the reflector 1 is converted into scattered light inside the light guide plate 21. As shown in FIG. 3, a part of this scattered light is emitted to the outside, but the light of a predetermined angle is repeatedly reflected in the light guide plate 21 and guided to the front end thereof, and the light is condensed from the front end. 3 The light is incident on the rear lateral end of the vehicle. This incident light is diffused vertically and horizontally by the condenser lens 3, and the front side of the vehicle is illuminated by this diffused light.

Here, since the light incident on the light guide plate 21 is the direct light from the discharge lamp 2, the installation of the light guide plate 21 does not reduce the light amount of the reflected light of the reflector 1, that is, the light emitted to the front of the vehicle. Absent.

In the above, as shown in FIG. 2, an example in which the light incident on the light guide plate 21 is guided only to the end portion of the rear surface of the condenser lens 3 in the lateral direction of the vehicle has been shown. You may also be guided to the department.

G. Effect of the Invention According to the present invention, while guiding the incident light directly incident on the light guide plate from the light source to the vehicle lateral direction end portion on the rear surface of the condenser lens,
Since this light is configured to be guided to the front side of the vehicle through the condensing lens, in order to guide the light to the front side of the lens without reducing the amount of light emitted to the front of the vehicle. It is possible to increase the irradiation light amount in the vicinity of the front side of the vehicle without providing an opening (without impairing the appearance) as compared with the conventional case.

[Brief description of drawings]

1 to 3 show an embodiment of the present invention, in which FIG. 1 is a sectional view of a projector type vehicle headlamp according to the present invention as seen from above the vehicle, and FIG. 2 is a perspective view thereof. FIG. 3 is a diagram illustrating a light path of the light guide plate. FIG. 4 is a sectional view showing a conventional example of a projector-type vehicle headlight. 1: Reflector, 2: Discharge lamp 3: Condenser lens, 4: Shade 21: Light guide plate

Claims (1)

[Claims] 1. A reflector, a light source arranged at a focal position of the reflector, a lens for condensing light from the light source and the reflector, and a cut line for irradiation light arranged between the condensing lens and the reflector. In a projector-type vehicle headlamp having a shade that produces a light, a direct light from the light source is incident, and a light guide plate that guides the incident light to a vehicle lateral direction end portion of the rear surface of the condenser lens is provided. A projector-type vehicle headlamp, characterized in that light emitted from a light guide plate is transmitted through an end portion of the condenser lens in a lateral direction of the vehicle to be radiated toward a front side of the vehicle.