JP2588658Y2 - Projector lamp - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicular lamp, and more particularly to a projector lamp used as a lighting lamp such as a headlamp.

[0002]

2. Description of the Related Art A conventional projector lamp 90 of this type is used.
FIG. 6 shows an example of the configuration of FIG. 6. For example, a light source 92 such as a filament of a light bulb is disposed at one focal point F1 of an ellipsoidal reflecting mirror 91 such as a spheroidal surface, and the reflected light is transmitted to the other focal point. The light is converged, and a shielding plate 93 is inserted into the converged reflected light so as to shield the lower half, which becomes upward light in light distribution characteristics.

As described above, the reflected light beam whose lower half is shielded and whose cross section is formed in a semicircular shape with the lower chord is projected in the irradiation direction by the projection lens 94. At this time, the reflected light is turned upside down. It becomes a semicircular shape of the first chord and does not include any upward light, so that a light distribution characteristic that does not cause dazzling to oncoming vehicles or the like can be obtained.

[0004]

However, in the above-mentioned conventional configuration, approximately half of the light amount is shielded and lost by the shielding plate 93, so that brightness is obtained for the power consumption of the light source 92. This creates a problem that cannot be achieved. Conversely, in order to obtain sufficient brightness, it is necessary to consume approximately twice as much power as compared to a lamp using a parabolic reflector. However, problems have arisen in aspects other than brightness, such as improvement in the heat resistance of the lamp body, and solving these points has been an issue.

Further, in the conventional configuration, unnecessary portions in light distribution characteristics are completely shielded by the shielding plate 93, so that basically no upward light is included. There is also a problem that it is difficult to confirm a position higher than the driver's line of sight or a road sign provided above the road surface, and the present invention can solve this problem.

[0006]

According to the present invention, as a specific means for solving the above-mentioned conventional problems, an elliptical reflector having a light source at one focal point, and A shielding plate is provided in the reflected light beam converging to the other one of the focal points and shields a part of the reflected light beam. The projection lens projects the reflected light beam after being shielded by the shielding plate in the irradiation direction. In the projector lamp, an opening is provided in a portion of the shielding plate where the reflected light comes into contact, and substantially the entire amount of the reflected light passing through the opening along the upper end of the opening is reflected substantially downward. A projector lamp, comprising: a substantially reflecting plate-like first reflecting surface; and a second reflecting surface for reflecting light reflected from the first reflecting surface in a predetermined direction along a lower end of the same opening. Solve the problem by providing Than it is.

[0007]

Next, the present invention will be described in detail with reference to an embodiment shown in the drawings. 1 is a projector lamp according to the present invention. The projector lamp 1 also includes an ellipsoidal reflecting mirror 3 in which a light source 2 is disposed at one focal point F1, a shielding plate 4, and a projection lens 5. And the shielding plate 4 is arranged so as to shield a portion that becomes upward light in the light beam of the reflected light beam converging on the other one focal point F2, as in the conventional example. is there.

However, according to the present invention, the shielding plate 4
An opening 41A is provided at a portion where the reflected light beam abuts, so that the reflected light beam can pass through. At the same time, a substantially shelf-shaped first reflecting surface 42A having a surface facing the elliptical reflecting mirror 3 as a mirror surface is provided so as to be connected to the upper end 41a of the opening 41A. It is assumed that the entire amount is reflected substantially downward.

A second reflecting surface 43A, which is connected to the lower end 41b of the opening 41A and reflects light reflected from the first reflecting surface 42A toward the projection lens 5, is also provided in a substantially shelf shape. It is supposed to be. Therefore, the reflected light beam from the elliptical reflecting mirror 3 does not directly pass through the opening 41A and reaches the projection lens 5, but is reflected by the opposing first reflecting surface 42A and second reflecting surface 43A. Thus, the projection lens 5 reaches the projection lens 5 after the direction intended by the designer is given.

Here, the opening 41A, the first reflecting surface 42A, and the second reflecting surface 43A will be described in more detail. First, the opening 41A shown in FIG.
At this time, the first reflecting surface 42A and the second reflecting surface 43A are appropriately formed in a shape such as a concave cylindrical surface at the same time, and a horizontal light beam is incident on the projection lens 5. It is supposed to be.

FIG. 3 shows the auxiliary light distribution characteristic DA from the opening 41A obtained in this way. In addition to the original light distribution characteristic D by the projector lamp 1, a horizontal line H
The auxiliary light distribution characteristic DA from the opening 41A having a large width in the horizontal direction is overlapped directly below, so that a brighter light distribution characteristic can be obtained as a whole. In other words, in other words, the amount of light that has been blocked and disabled by the shield plate 4 in the past is regenerated.

FIG. 4 shows another embodiment of the present invention. In contrast to the previous embodiment in which the main purpose of the present invention is mainly to regenerate the amount of light, this embodiment is different from that of the projector lamp 1 shown in FIG. The main purpose is to improve visibility. In order to achieve the above object, in this embodiment, the opening 41B
When the projector lamp 1 is for left-hand traffic, the projection lens 5 is provided near the right end of the shielding plate 4 when viewed from the driver's seat side, and the first reflection surface 42B and the second reflection surface 43B also emit light rays that spread in the vertical direction. Is formed.

FIG. 5 shows the auxiliary light distribution characteristic DB from the opening 41B obtained in this way, and the left end of the original light distribution characteristic D of the projector lamp 1 on the road shoulder side has upward light. The auxiliary light distribution characteristic DB including the above is duplicated, and the visibility on the road shoulder side described above is remarkably improved.
Therefore, in this embodiment, although the improvement of the light amount cannot be expected to be so much improved, the basic characteristics of the projector lamp 1, which is considered to be inferior in visibility of, for example, road signs, are improved. A remarkable effect can be obtained as in the embodiment.

[0014]

As described above, according to the present invention, an opening is provided at a portion where the reflected light beam abuts on the shielding plate, and substantially the entire amount of the reflected light beam passing through the opening along the upper end of the opening. A substantially reflecting plate-like first reflecting surface is provided for reflecting the light substantially downward, and a second reflecting surface is provided along a lower end of the same opening to reflect the light reflected from the first reflecting surface in a predetermined direction. By using the projector lamp, the light in the area that was conventionally blocked by the shielding plate and invalidated is transmitted through the opening, and the luminous flux is processed into an appropriate shape by the first reflection surface and the second reflection surface. The light is projected and regenerated by the projection lens and added or supplemented to the original light distribution characteristics to increase the amount of light and improve the visibility, thereby achieving an extremely excellent effect in improving the performance of this type of projector lamp. In things That.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a projector lamp according to the present invention.

FIG. 2 is a front view showing a main part of the same embodiment.

FIG. 3 is an explanatory diagram showing light distribution characteristics of the same embodiment.

FIG. 4 is a front view showing another embodiment of the present invention in a main part.

FIG. 5 is an explanatory diagram showing light distribution characteristics of another embodiment.

FIG. 6 is a sectional view showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Projector lamp 2 ... Light source 3 ... Elliptical reflecting mirror 4 ... Shielding plate 41A, 41B ... Opening 42A, 42B ... 1st reflection surface 43A, 43B ... 2nd reflection surface 5 ... Projection Lens D: Light distribution characteristics DA, DB: Auxiliary light distribution characteristics

Claims (1)

(57) [Scope of request for utility model registration] 1. An elliptical reflector having a light source disposed at one focal point, and a part of the reflected light being disposed in a reflected light beam converging at another focal point of the elliptical reflector. In a projector lamp comprising a shielding plate and a projection lens that projects a reflected light beam after being shielded by the shielding plate in an irradiation direction, an opening is provided in a portion of the shielding plate where the reflected light beam abuts, A substantially shelf-shaped first reflecting surface is provided along the upper end of the opening to reflect substantially the entire amount of reflected light passing through the opening substantially downward, and the first reflecting surface is provided along the lower end of the opening. A second reflecting surface for reflecting light rays reflected from the light source in a predetermined direction.