JP2007053053A - Projector-type headlamp - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a projector type headlamp capable of improving distant-place visibility of high-beam light distribution pattern. <P>SOLUTION: The direct emitting light L going upward from a light source 2 is either cut off by a vertical movement of a sub-shade 7 or irradiated to a second sub-reflector 8 after reflected by a first sub-reflector 6. The direct light L irradiated to the second sub-reflector 8 is reflected by the second sub-reflector 8 and passes the upper part without transmitting through a projector lens 5. Since it does not transmit through the projector lens 5, it become a light reaching far and thereby the distant place visibility at high-beam distribution pattern B is improved. Furthermore, since the sub-shade 7 and the main shade 4 are interlocked and move up and down, a solenoid 3 to drive these can be only one. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a projector-type headlamp.

In general, a projector-type headlamp includes a light source, a reflector, a projector lens, and a shade that are disposed in a forward-facing state along the optical axis. By moving the shade up and down, the light distribution pattern for low beam and the light distribution pattern for high beam can be switched. Recently, in order to shorten the front-rear dimension of the entire lamp, a projector-type headlamp in which the light source is disposed in a sideways state perpendicular to the optical axis has been developed (see, for example, Patent Document 1).
JP 2004-127830 A

  However, in such a conventional technique, since the light source is turned sideways, the direct light component irradiated upward from the light source is increased, but the increased direct light is transmitted through the projector lamp. Although it is a downward beam and is intense light, it cannot be used to improve the distance visibility of the high beam light distribution pattern.

  The present invention has been made paying attention to such a conventional technique, and provides a projector-type headlamp capable of improving the distance visibility of a high-beam light distribution pattern.

  The invention according to claim 1 is an elliptical main reflector, a light source disposed laterally in the vicinity of the first focal point of the main reflector, a main shade disposed to be movable up and down in the vicinity of the second focal point of the main reflector, A projector-type headlamp including a projector lens arranged so that a focal point is positioned near a second focal point of a main reflector, wherein the first focal point of the main reflector is positioned at a main reflector side position at an upper end portion of the projector lens. A shared ellipsoidal first sub-reflector is provided, a sub-shade that is movable up and down is provided near the second focal point of the first sub-reflector, and a release that focuses on the second focal point of the first sub-reflector is provided above the main reflector. A second sub-reflector having an object surface is provided.

  The invention according to claim 2 is characterized in that the sub-shade moves up and down integrally with the main shade.

  According to the first aspect of the present invention, the upward direct light from the light source is reflected by the first sub-reflector and then cut or irradiated to the second sub-reflector by the vertical movement of the sub-shade. The direct light emitted to the second sub reflector is reflected by the second sub reflector and passes above the projector lens without passing through the projector lens. Since it does not pass through the projector lens, the light reaches far and the high visibility of the high beam light distribution pattern is improved.

  According to the second aspect of the present invention, since the sub-shade moves up and down integrally with the main shade, only one drive unit is required to drive them.

  An object of the present invention is to provide a projector-type headlamp that can improve the distance visibility of a high-beam light distribution pattern, and is arranged horizontally in the vicinity of an elliptical main reflector and a first focal point of the main reflector. A projector-type headlamp comprising a light source, a main shade that can be moved up and down near the second focal point of the main reflector, and a projector lens that is arranged so that the focal point is located near the second focal point of the main reflector. In addition, an elliptical first sub-reflector sharing the first focal point of the main reflector is provided at a position on the main reflector side of the upper end portion of the projector lens, and a sub-movable sub-axis that is movable up and down near the second focal point of the first sub-reflector A paraboloid that is provided with a shade and focuses on the second focal point of the first sub-reflector at the top of the main reflector By providing the second sub-reflector, it was realized. Embodiments of the present invention will be described below with reference to the drawings.

  1 to 4 are diagrams showing an embodiment of the present invention. The projector type headlamp according to this embodiment includes an elliptical main reflector 1. The main reflector 1 has a first focal point a and a second focal point b. A light source 2 such as a high-intensity discharge lamp (HID) is disposed in the horizontal direction at the first focal point a. A main shade 4 that is movable up and down by a solenoid 3 is provided at the second focal point b. In front of the main shade 4, a projector lamp 5 having the second focal point b of the main reflector 1 as a focal point is set.

  A first sub-reflector 6 is installed in a rearward state slightly behind the upper end of the projector lamp 5. The first sub-reflector 6 has an elliptical surface and shares the first focal point a of the main reflector 1. The second focal point c of the first sub-reflector 6 has a rear obliquely upper side. A subshade 7 is disposed at the second focal point c. The sub-shade 7 is connected to the lower main shade 4 via a bracket (not shown), and can be moved up and down integrally with the main shade 4 by the driving force of one solenoid 3. A parabolic second sub-reflector 8 having a second focal point c of the first sub-reflector 6 as a focal point is provided on the upper portion of the main reflector 1.

Low beam light distribution pattern A (see Fig. 3):
In order to obtain a low beam light distribution pattern A, the main shade 4 and the subshade 7 are raised by the solenoid 3, and light that is reflected upward from the light source 2 to the main reflector 1 is cut by the main shade 4, and the light source The upward direct light L reflected from 2 to the first sub-reflector 6 is cut by the sub-shade 7. Therefore, the light distribution pattern A is a low beam, which is suitable when the vehicle passes.

High beam light distribution pattern B (see FIG. 4):
In order to obtain the low beam light distribution pattern B, the main shade 4 and the subshade 7 are lowered by the solenoid 3 so that the upward light reflected from the light source 2 to the main reflector 1 is transmitted to the projector lens 5 and the light source The upward direct light L reflected by the first sub-reflector 6 from 2 is reflected by the second sub-reflector 8 so as to pass above the projector lens 5 and irradiate forward. Since the light does not pass through the projector lens 5, the light reaches far away, and the distant visibility at the time of the high beam light distribution pattern B is improved.

  In this embodiment, the main shade 4 and the sub shade 7 are actuated by one solenoid 3, but they may be moved up and down by independent drive sources.

1 is a schematic cross-sectional view of a projector type headlamp according to an embodiment of the present invention as viewed from the side. The schematic sectional drawing which looked at the projector type headlamp from the top. FIG. 2 is a schematic cross-sectional view corresponding to FIG. 1 showing a projector lamp in a low beam light distribution pattern state. FIG. 2 is a schematic cross-sectional view corresponding to FIG. 1 showing a projector lamp in a high beam light distribution pattern state.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main reflector 2 Light source 3 Solenoid 4 Main shade 5 Projector lens 6 1st sub reflector 7 Sub shade 8 2nd sub reflector a 1st focus of a main reflector b 2nd focus of a main reflector c 2nd focus of a 1st sub reflector A Low beam light distribution pattern B High beam light distribution pattern

Claims (2)

An elliptical main reflector, a light source arranged laterally near the first focal point of the main reflector, a main shade arranged near the second focal point of the main reflector, and a main shade near the second focal point of the main reflector A projector-type headlamp having a projector lens arranged so that a focal point is located,
An elliptical first sub-reflector that shares the first focal point of the main reflector is provided at a position on the main reflector side of the upper end of the projector lens, and a sub-shade that can move up and down is provided near the second focal point of the first sub-reflector. A projector-type headlamp, characterized in that a parabolic second sub-reflector focusing on the second focal point of the first sub-reflector is provided above the main reflector. The projector-type headlamp according to claim 1,
A projector-type headlamp, wherein the sub-shade moves up and down integrally with the main shade.

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