JP2579260Y2 - Variable light distribution projector lamp - Google Patents

Description

[Detailed description of the invention]

[0001]

The present invention changes the direction of the illuminating light beam,
The present invention relates to an improvement in a variable light distribution projector lamp that changes a light distribution pattern, and more particularly to a variable light distribution projector lamp with improved illuminance efficiency of an irradiation light beam.

[0002]

2. Description of the Related Art Conventionally, in a projector-type headlamp of an automobile, a reflector 51 disposed behind a collimator lens 50 is, as shown in FIG. 9, centered on a fulcrum O on an optical axis L1. The optical axis L2 is rockingly displaced or, as shown in FIG. 10, the optical axis L2 of the reflector 51 is displaced in parallel with respect to the optical axis L1 so as to be on the optical axis of the elliptical reflecting mirror surface 52 formed on the reflector 51. In order to improve the visibility in the turning direction, the reflected light beam from the fixed lighting bulb 53 is swung right and left with the light beam pattern formed by the shade 54 disposed on the focal plane of the collimator lens 50. A structure with a different structure is used.

That is, in the former case (FIG. 9), the angle of the reflector 51 with respect to the collimator lens 50 is displaced (arrow A), and in the latter case (FIG. 10), the optical axis position of the reflector 51 with respect to the collimator lens 50 is changed. By displacing (arrow B), the irradiation direction of the light beam pattern is swung right and left.

[0004]

However, according to the above configuration, the angle of the reflector 51 with respect to the collimator lens 50 is displaced (arrow A) as shown in FIG. Alternatively, as shown in FIG. 10, when the optical axis position of the reflector 51 with respect to the collimator lens 50 is displaced (arrow B), the light beam is deviated to one side with respect to the optical axis L1 of the collimator lens 50, and the inner wall of the lamp is moved. A light beam portion that is irradiated and no longer enters the aperture of the collimator lens 50 (a portion indicated by thick hatching in the figure).
It is known to produce For this reason, there is a problem that the light emitted from the bulb 53 is not used effectively, and the amount of light is reduced, resulting in reduced visibility during turning.

[0005] The present invention has been made in view of the above problems, and has a novel light distribution variable structure that can maintain the light quantity of the entire lamp even when the irradiation light beam is swung right and left and does not cause a decrease in visibility. It is an object to provide a type projector lamp.

[0006]

In order to achieve the above object, a variable light distribution type projector lamp according to the present invention comprises a reflector having a lighting bulb fixed to the bottom of a reflecting mirror behind a front lens, and having a front face. In a variable light distribution type projector lamp which is tilted or displaced parallel to the optical axis of the lens, the lens aperture of the front lens is configured such that the axial length of the reflector in the displacement direction is longer than the axial length in the other direction. The gist is that it has been done.

[0007]

According to the above construction, since the front shape of the front lens is formed in an elliptical shape or an elliptical shape in which the lens axis is elongated in the direction of displacement of the reflector, the reflector is displaced to drive the reflected light beam. In this case, even if the light beam entering the front lens is deflected, the light beam incident on the front lens is not cut. Therefore, the entire luminous flux can be effectively irradiated forward, so that the light amount of the lamp is increased.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a variable light distribution type projector lamp according to the present invention will be described below with reference to FIGS. In the drawings, reference numeral 1 denotes a collimator lens formed of a spherical lens fixed to the front end side of the lamp body 2 and having a front surface having a vertical a with the optical axis L1 of the collimator lens 1 as a central axis.
An elliptical shape having a length of the horizontal b and having a long axis in a displacement direction of the reflector 3 described later. That is, as shown in FIG. 4, the elliptical front shape collimator lens 1 is a rotationally symmetric spherical lens exhibiting a perfect circular front shape, and a portion shown by a broken line is removed to make the front shape elliptical. .

At the rear end of the lamp body 2, a reflector 3 is pivotally mounted via a reflector displacement support mechanism 4, and the reflector 3 is laterally moved by a reflector drive mechanism 5 provided in the reflector displacement support mechanism 4. It is configured to be capable of driving displacement in the direction.

The reflector 3 is provided with a lighting bulb 7 fixed to the bottom so as to be located at the first focal point F1 of the elliptical reflecting mirror surface 6, and located at the displacement locus of the second focal point F2. The shade 8 is fixed to the lamp body 2 so as to be located substantially behind the optical axis L1 of the collimator lens 1 along a substantially focal plane formed by the focal plane, and a part of the light beam is cut to reduce the irradiation light beam. A pattern is formed.

The variable light distribution type projector lamp configured as described above is moved by the displacement means of the reflector 3.
The reflector displacement support mechanism 4 includes a reflector rotation support mechanism 4a shown in FIG. 5 or a reflector parallel movement support mechanism 4b shown in FIG. That is, the reflector rotation support mechanism 4a in FIG. 5 is rotatably mounted so that the rotation center O of the reflector 3 is located on the optical axis L1 at the position of the collimator lens 1, and the deflection angle θ in the left-right direction. It has a structure with. Then, even when the reflector 3 reaches the maximum deflection angle θ, the outside reflected light beam from the elliptical reflecting mirror surface 6 enters the length b of the collimator lens 1 in the long axis direction, and becomes a transmitted light beam L forward. It is configured in.

In the reflector parallel movement support mechanism 4b shown in FIG. 6, the optical axis L2 of the reflector 3 is pivotally mounted on the optical axis L1 of the collimator lens 1 such that the optical axis L2 of the reflector 3 can be freely displaced parallel to the horizontal direction (displacement amount w). It has a structure. Even when the reflector 3 is displaced to the maximum w, the elliptical reflecting mirror surface 6
The reflected light flux from outside enters the length b of the collimator lens 1 in the major axis direction and becomes a transmitted light flux L forward.

Next, FIGS. 7 and 8 show another embodiment of the front lens in place of the collimator lens 1. FIG. The front lens 1a of FIG.
The front surface formed by the cylindrical lens portion 11 is formed of a compound lens having an elliptical shape, and the light is condensed only in the vertical direction in the cylindrical lens portion 11.
It has a structure that forms a transmitted light beam that diffuses in the left-right direction.

The front lens 1b shown in FIG. 8 is formed so that its vertical section has a shape corrected for an ellipse or a circular arc, and has a horizontal cross-sectional curved shape designed so that the front shape is a horizontally long ellipse. In this case, the converging power in the left-right direction is smaller than the converging power in the up-down direction.

[0015]

As described above, the variable light distribution type projector lamp according to the present invention is obtained by forming the front shape of the front lens into an elliptical shape or an elliptical shape by extending the lens axis in the direction of displacement of the reflector. Even when the reflector is displaced and the reflected light beam is shaken, the light beam incident on the front lens is not cut off, and the light beam can be effectively irradiated forward, thereby improving the illuminance efficiency of the light distribution, It has a feature that a bright field of view can be secured, and the effect obtained by implementing the present invention is extremely large.

[Brief description of the drawings]

FIG. 1 is a schematic side sectional view showing an embodiment of a variable light distribution type projector lamp according to the present invention.

FIG. 2 is a schematic plan sectional view of the same.

FIG. 3 is a front sectional view of the same.

FIG. 4 is a perspective view of the collimator lens.

FIG. 5 is a schematic plan sectional view showing an operating state of a reflector displacement support mechanism according to the first embodiment.

FIG. 6 is a schematic plan sectional view showing an operating state of a reflector displacement support mechanism according to a second embodiment.

FIG. 7 is a perspective view showing a second embodiment of the front lens.

8A is a front view showing a third embodiment of the front lens, FIG. 8B is a cross-sectional view taken along line bb, FIG.

FIG. 9 is a schematic plan sectional view showing an operation state of a conventional swingable reflector displacement support mechanism of a variable light distribution type projector lamp.

FIG. 10 is a schematic plan cross-sectional view showing an operation state of a parallel-movement reflector displacement support mechanism of a conventional variable light distribution type projector lamp.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Collimator lens 1a Front lens 1b Front lens 3 Reflector 4 Reflector displacement support mechanism 4a Reflector rotation support mechanism 4b Reflector parallel movement support mechanism 5 Reflector drive mechanism 7 Valve 8 Shade 10 Half cut spherical lens section 11 Cylindrical lens section

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F21M 3/05 F21M 3/02 F21M 3/20

Claims (1)

(57) [Scope of request for utility model registration] 1. A reflector which is pivotally provided behind a front lens and has a lighting valve fixed to the bottom of a reflecting mirror surface so as to be tilted or displaced parallel to an optical axis of the front lens. A variable light distribution type projector lamp, wherein a lens diameter of the front lens is formed such that an axial length in a displacement direction of the reflector is longer than an axial length in another direction.