JP2004047327A - Projector-type lighting fixture for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve inconveniences that utilization rate of light flux is low and a headlamp is apt to be dark because about one-half of light source light has been covered by a shielding plate, in a projector type light fixture for vehicle of this conventional type. <P>SOLUTION: In this projector-type lighting fixture 1 for the vehicle, a notched part 2d is installed at least at either side of vertical direction of the main oval reflection surface 2, and in the notched part 2d, two auxiliary oval reflection faces 6 which make the neighborhood of a light source 3 have a first focus and of which the major axis Y is intersected by the major axis X of the main oval reflection surface 2 at an appropriate angle making it roughly left-right symmetry are provided. In each auxiliary oval reflection surface 6, a parabolic reflection surface 7 is installed so that a vicinity of a second focus of this auxiliary oval reflection surface is made to have a focus, and the reflecting direction is made to be roughly the direction of radiation. As a result, capturing rate of the light flux for the light source is improved. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a lighting device for a vehicle, such as a headlamp or a fog lamp, and more particularly to a configuration in which an ellipsoidal reflecting surface such as a spheroidal reflecting surface is basically employed as a main reflecting surface. And a lighting device for a vehicle.
[0002]
[Prior art]
FIG. 7 shows an example of the configuration of a conventional projector-type lamp 90 for a vehicle of this type. An elliptical reflecting surface 91 such as a spheroid obtained by rotating an ellipse about a long axis X is used as the reflecting surface. A light source 92 such as a filament of an incandescent lamp is disposed at the position of the first focal point f1 of the elliptical reflecting surface 91.
[0003]
By doing so, the light emitted from the light source 92 and reflected on the elliptical reflecting surface 91 converges on the second focal point f2. For example, the light beam is provided so as to cover the lower half, and the cross-sectional shape of the light beam is shaped like a crescent half moon.
[0004]
Then, since the cross-sectional shape of the light beam is inverted up and down and left and right by projecting it with the projection lens 94, the half-moon shape of the lower chord becomes the upper-limit half-moon shape, that is, the upward direction which causes dazzling to oncoming vehicles. Since the light does not include any light, a passing light distribution can be obtained.
[0005]
[Problems to be solved and used by the invention]
However, in the above-described conventional projector-type lamp 90 for a vehicle, the lower half of the light beam is covered by a shielding plate 93 in order to obtain a low-pass light distribution used in most situations during night driving, ie, the elliptical system. Since almost half of the reflected light from the reflecting surface 91 is shielded, the luminous flux utilization rate for the light source 92 is low, and the projector-type lamp 90 for a vehicle becomes dark.
[0006]
Further, since the projection lens 94 is a convex lens having a relatively small diameter (for example, a diameter of about 70 mm), the light emission area at the time of lighting is small and visibility from an oncoming vehicle is low. There are also problems in performance such as low illuminance and insufficient visibility to distant places.
[0007]
[Means for Solving the Problems]
The present invention, as a specific means for solving the above-described conventional problems, a light source, a main elliptical reflecting surface having a long axis near the light source as a first focal point and a long axis as an irradiation direction of the vehicle projector lamp, A vehicular projector-type lamp in which a projection lens is provided in front of an irradiation direction of a second focal point of the main elliptic reflecting surface, and a cutout is provided on at least one of the vertical directions of the main elliptic reflecting surface. The notch portion is provided with two auxiliary elliptical reflecting surfaces which are substantially bilaterally symmetrical with the first focal point in the vicinity of the light source, the major axis intersecting the major axis of the main elliptic reflecting surface at an appropriate angle, and being substantially symmetrical. A vehicular projector characterized in that a parabolic reflecting surface is provided for the auxiliary elliptical reflecting surface of (1), the focal point being in the vicinity of the second focal point of the auxiliary elliptical reflecting surface, and the reflecting direction being substantially the irradiation direction. Challenges by Providing Lighting Fixtures It is intended to attain.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, the present invention will be described in detail based on an embodiment shown in the drawings. Reference numeral 1 in FIGS. 1 to 3 denotes a vehicle projector lamp according to the present invention. The vehicle projector lamp 1 has a main elliptic reflection such as a spheroid obtained by rotating an ellipse about a long axis X. In the conventional example, the light source 3 is disposed near the first focal point f1 of the main elliptic reflecting surface 2 and the shielding plate 4 and the projection lens 5 are provided. It is similar to that of
[0009]
Here, in the present invention, the notch 2d is provided in the main elliptic reflecting surface 2, and the notch 2d is located above the main elliptic reflecting surface 2 in the state of attachment to the vehicle in actual implementation. Although it may be lower, or may be both upper and lower, here, an example will be described in which the projector-type lamp 1 is provided below which is expected to be effective in increasing the amount of light. .
[0010]
By providing the notch 2d, the lower part of the light emitted from the light source 3, that is, the light going to the notch 2d does not reach the main elliptic reflection surface 2. Therefore, in the present invention, the auxiliary elliptical reflecting surface 6 is provided at a position corresponding to the notch 2d, and the auxiliary elliptical reflecting surface 6 is a spheroid having the light source 3 or its vicinity as the first focal point f11. It is formed as an elliptical reflection surface such as a surface.
[0011]
At this time, the auxiliary elliptical reflecting surface 6 crosses the major axis Y toward the left side as shown in FIG. 2 when the projector type lamp 1 for a vehicle is mounted on a vehicle and viewed from the driver's seat side. And an auxiliary elliptical reflecting surface 6R that crosses rightward. In this embodiment, the auxiliary elliptical reflecting surface 6L and the auxiliary elliptical reflecting surface 6R are shown as being symmetric with respect to the major axis X, but the present invention is not limited to this. Absent.
[0012]
Accordingly, the second focal points f12 of the auxiliary elliptical reflecting surfaces 6L and 6R are also symmetrical, and in this embodiment, the vehicle projector-type lamp 1 is viewed from the front as shown in FIG. The bifocal f12 is set so as to be appropriately outside the maximum outer diameter of the main elliptic reflecting surface 2.
[0013]
In response to the left and right second focal points f12, the second focal point f12 or the vicinity thereof has a focal point, and a paraboloid of revolution or the like whose reflection direction is substantially parallel to the long axis X is used. The object-based reflecting surfaces 7L and 7R are provided, and the reflected light from the auxiliary elliptic-based reflecting surfaces 6L and 6R converging on the second focal point f12 is reflected as parallel rays directed toward the irradiation direction. In front of the traveling directions of the reflected lights of 7L and 7R, inner lenses 8L and 8R that appropriately diffuse light in the horizontal direction are provided (see FIGS. 1 and 2).
[0014]
Here, when considering the inner lenses 8L and 8R and the projection lens 5, both of them constitute a light emitting portion when the vehicle-type projector lamp 1 is turned on. In many cases, the projection lens 5 is integrated with the inner lens 8 (L, R) by the flange 5a as shown in FIG. What is necessary is just to let 8 hold the projection lens 5. In FIG. 2, the reference numeral 10 denotes an outer lens. The outer lens 10 has a shape conforming to the vehicle body design, and covers the projection lens 5 and the inner lens 8 from the outside to improve the beauty.
[0015]
FIG. 4 shows an example of the light distribution characteristic D of the projector-type lighting device 1 for a vehicle according to the present invention configured as described above. In FIG. The main light distribution formed by the above, and indicated by reference numeral D2 in the figure, is an auxiliary elliptical reflecting surface 6 (L, R), a parabolic reflecting surface 7 (L, R), and an inner lens 8 (L, R). R) and the auxiliary light distribution. The light distribution characteristic D is the sum of the main light distribution D1 and the auxiliary light distribution D2.
[0016]
Here, considering the auxiliary light distribution D2, the auxiliary light distribution D2 reflects light from the lower half of the main elliptic reflection surface 2 originally shielded by the shielding plate 4 in the auxiliary elliptical reflection. Since the light is collected on the surface 6, the light amount of the auxiliary light distribution D2 is an increase from the light amount of the conventional example.
[0017]
Therefore, the projector-type lamp 1 for a vehicle has the same light quantity and light distribution shape as those of the conventional example by only the reflected light from the main elliptic reflecting surface 2. There is a high degree of freedom in distributing the amount of light obtained by the parabolic reflective surface 7 and, for example, irradiates the spot substantially in the frontal direction to improve the far field of view. Alternatively, various measures are possible, such as widespreading in the horizontal direction to secure a wide field of view in city driving. Also, inner lenses 8 (L, R) are present on the left and right sides of the projection lens 5, so that when lit, the light emitting area is enlarged, and visibility from oncoming vehicles and the like is also improved.
[0018]
FIGS. 5 and 6 show another embodiment of the vehicular projector-type lamp 1 according to the present invention. In the previous embodiment, the notch 2 d is provided only below the main elliptic reflecting surface 2. However, in this embodiment, a cutout 2u provided above and a cutout 2d provided below are provided at two places.
[0019]
In addition, corresponding to the notch 2d provided below, the auxiliary elliptical reflecting surface 6 (Ld, Rd) having the same configuration as that of the previous embodiment is provided, and the notch 2u provided above. , The auxiliary elliptical reflection surface 6 (Lu, Ru) is provided in a shape such that the auxiliary elliptical reflection surface 6 (Ld, Rd) is rotated by 180 ° about the long axis X. .
[0020]
A parabolic reflecting surface 7Ld is provided corresponding to the auxiliary elliptical reflecting surface 6Ld, and a parabolic reflecting surface 7Rd is provided corresponding to the auxiliary elliptic reflecting surface 6Rd. Is provided with a parabolic reflecting surface 7Lu, and corresponding to the auxiliary elliptical reflecting surface 6Ru, a parabolic reflecting surface 7Ru is provided. An inner lens 8 (Ld, Lu, Rd, Ru) is provided in front of each parabolic reflecting surface 7 (Ld, Lu, Rd, Ru) in the irradiation direction.
[0021]
With this configuration, in this embodiment, similar to the vehicle-type projector lamp 1 of the previous embodiment, improvement in brightness due to an increase in the amount of light can be expected, and the projection lens 5 and the inner lens 8 are connected to each other. The shape when combined is also symmetrical in the horizontal and vertical directions, and improvement in design can be expected. Further, the area of the inner lens 8 with respect to the projection lens 5 is also increased, and the visibility from an oncoming vehicle or the like at the time of lighting is further improved.
[0022]
5 and 6, reference numeral 9 denotes a rotating shaft. The rotating shaft 9 is, for example, a parabolic reflecting surface 7L on the left side of the vehicle projector type lamp 1 mounted on the left side of the vehicle. (Or one of 7Ld and 7Lu, or both 7Ld and 7Lu), and the left parabolic reflecting surface 7L is rotatable about a vertical axis passing through the focal point. The rotation shaft 9 receives a signal from a steering device or the like, and turns the left parabolic reflective surface 7L to the left when the vehicle is operated to make a left turn. Therefore, at the time of turning of the vehicle, the direction in which the vehicle advances thereafter is illuminated more brightly.
[0023]
The above-described configuration is naturally applied to the parabolic reflective surface 7R on the right side of the vehicle projector-type lamp 1 mounted on the right side of the vehicle, and can cope with the right turn of the vehicle. ing. The left and right parabolic reflecting surfaces 7L and 7R of one projector-type lamp 1 for a vehicle correspond to the type of vehicle in which only one lamp is used, such as a motorcycle. And the like can be freely provided.
[0024]
【The invention's effect】
As described above, according to the present invention, at least one of the vertical directions of the main elliptic reflecting surface is provided with a notch, and the notch has a first focal point near the light source and a long axis whose main axis is the main elliptic reflecting surface. There are provided two auxiliary elliptical reflecting surfaces which intersect with the long axis of the surface at an appropriate angle and are substantially symmetrical, and each auxiliary elliptical reflecting surface is focused on the vicinity of the second focal point of the auxiliary elliptical reflecting surface. First, the vehicle-projector-type lamp provided with a parabolic reflecting surface whose reflection direction is substantially the irradiation direction improves the luminous flux capture rate with respect to the light source, and is even brighter with the same light source. This makes it possible to realize a vehicle lamp and has an extremely excellent effect in improving the performance of this type of vehicle projector lamp.
[0025]
Second, the use of an inner lens in addition to the projection lens increases the light emission area when lit, improves visibility from oncoming vehicles, pedestrians, etc., and is extremely superior in improving safety. Has the effect. Furthermore, by being able to obtain two types of irradiation light by the main ellipsoidal reflecting surface, the auxiliary elliptical reflecting surface and the parabolic reflecting surface, one of which is turned to double as a cornering lamp, This type of vehicle projector type lamp also has an extremely excellent effect on improving the function.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an embodiment of a vehicle projector lamp according to the present invention.
FIG. 2 is a sectional view taken along line AA of FIG.
FIG. 3 is a sectional view taken along the line BB of FIG. 2;
FIG. 4 is an explanatory diagram showing a state of formation of light distribution characteristics in the vehicle projector lamp according to the present invention.
FIG. 5 is a perspective view showing another embodiment of the vehicle projector-type lamp according to the present invention.
FIG. 6 is a sectional view taken along line CC of FIG. 5;
FIG. 7 is a sectional view showing a conventional example.
[Explanation of symbols]
1 ... Vehicle projector lamp 2 ... Main elliptical reflecting surface 2d, 2u ... Notch 3 ... Light source 4 ... Shielding plate 5 ... Projection lens 6 (L, Ld, Lu, R, Rd, Ru) ) ... Auxiliary elliptical reflecting surface 7 (L, Ld, Lu, R, Rd, Ru) ... Parabolic reflecting surface 8 (L, Ld, Lu, R, Rd, Ru) ... Inner lens 9 ... Rotating shaft 10: Outer lens

Claims (3)

A light source, a main elliptical reflecting surface having a first focus near the light source and a long axis as an irradiation direction of the vehicle-type projector lamp, and a projection lens in front of the main elliptic reflecting surface in a second focus irradiation direction. Is provided with a notch in at least one of the up and down direction of the main elliptical reflection surface, the notch has a long axis with a first focus near the light source. There are provided two auxiliary elliptical reflecting surfaces which intersect at an appropriate angle with the major axis of the main elliptic reflecting surface and are substantially symmetrical with respect to each other. A projector-type lamp for a vehicle, comprising a parabolic reflecting surface having a focal point near the two focal points and a reflecting direction substantially equal to an irradiation direction. 2. The projector-type lamp according to claim 1, wherein the parabolic reflecting surface is rotatable in a substantially horizontal direction about an axis near the focal point. The vehicle projector according to claim 1 or 2, wherein an inner lens is provided in front of the parabolic reflecting surface in the irradiation direction, and the inner lens is configured to hold the projection lens. Type lighting.

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