JP4548981B2 - Projector type lamp - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a lamp such as a headlamp and a fog lamp for a vehicle, and more specifically, an elliptical reflecting surface having two elliptical focal points such as a spheroid and a first focal point of the elliptical reflecting surface. Necessary for adjusting the light distribution characteristics in the vicinity of the light source arranged in the vicinity, the aspherical lens arranged to have a focal point near the second focal point where the light from the light source converges, and the focal position of the aspherical lens The present invention relates to a projector type lamp provided with a shade arranged according to the above.
[0002]
[Prior art]
In general, this type of projector-type lamp 90 is configured, for example, as shown in FIG. 12, and this projector-type lamp 90 has a light source 92 in the vicinity of the first focal point f1 of an elliptical reflecting surface 91, for example, a spheroidal surface. And an aspherical lens 93 is arranged so as to have a focal point f3 in the vicinity of the second focal point f2 where the light from the light source 92 converges.
[0003]
Further, if a shade 94 that passes only the shape of a desired light distribution characteristic and shields an unnecessary portion is provided in the light beam that converges on the second focal point f2, for example, a projector-type lamp having an appropriate light distribution characteristic such as a passing beam. 90 is obtained.
[0004]
[Problems to be solved by the invention]
However, in such a conventional projector-type lamp 90, since the light once converged to the second focal point f2 and then diffused radially is projected toward the irradiation direction by the aspherical lens 93, the light distribution characteristic is improved. Although it has superior characteristics in terms of forming the shape, the degree of freedom of illuminance distribution within the shape of the light distribution characteristic is low, for example, in order to improve the visibility as a headlamp for traveling light distribution, There was a problem in that it was impossible to obtain irradiation characteristics that brightly illuminate far away by suppressing the near brightness in the shape.
[0005]
Further, the aspheric lens 93 has a small outer diameter, and when this lamp is used as a headlight for an automobile, there is a problem that the light emitting area is small and the visibility from an oncoming vehicle is poor.
[0006]
Furthermore, since the aspherical lens 93 has a circular shape when viewed from the front, and only the aspherical lens 93 can be seen when attached to the vehicle, each of them has a similar impression, and is designed for each vehicle type, for example. It was impossible to produce the above difference, and there was a problem that the degree of freedom in design was lacking.
[0007]
[Means for Solving the Problems]
The present invention provides a projector-type lamp comprising a light source, a reflecting mirror, a projection lens, and a shade provided as necessary, as a specific means for solving the above-described conventional problems. Is a C-8 type incandescent lamp or metal halide lamp along the optical axis direction, and the reflecting mirror has at least a part of an elliptical reflecting surface such as a spheroid surface having the light source as a first focal point on the light source side. A central reflective surface formed in a strip shape extending toward the direction, an upper reflective surface formed on the upper portion of the central reflective surface, and a lower reflective surface formed on the lower portion of the central reflective surface, The projection lens includes an aspheric lens arranged so as to have a focal point in the vicinity of the second focal point of the central reflecting surface, and at least one horizontally long lens arranged side by side above and below the aspheric lens. Configured I, the lateral length lens horizontal section vertical cross section extended along the cross-sectional shape in a linear or curved in the same convex lens shape as the aspherical lens is a rectangular semi-cylindrical shape, the upper reflection surfaces and lower reflection The surface is formed as a part of an elliptical reflecting surface whose optical axis is inclined in the direction in which the lateral lens is disposed with respect to the optical axis of the central reflecting surface, and is reflected from the upper reflecting surface and the lower reflecting surface. The present invention solves the problem by providing a projector-type lamp characterized in that light is formed so as to be incident on the horizontally long lens.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Next, the present invention will be described in detail based on embodiments shown in the drawings.
[0009]
FIG. 1 is a perspective view showing a main part of a first embodiment of a projector-type lamp 1 according to the present invention. The projector-type lamp 1 includes a reflecting surface having two elliptical focal points such as a spheroid. And a light source 3 such as a halogen bulb or a metal halide lamp disposed near the first focal point of the reflecting surface of the reflecting mirror 2, and a focal point near the second focal point where the light from the light source 3 converges. And a shade (not shown) arranged for adjusting the light distribution characteristics in the vicinity of the focal position of the aspheric lens 4a. The process up to this point is the same as that of the conventional example.
[0010]
Here, in the present invention, the reflecting mirror 2 is formed on a reflecting surface that is divided into three vertically when viewed from the front, and the projection lens 4 is added to the aspherical lens 4a installed at the center, and the first cylindrical lens 4b and the second cylindrical lens 4b. It is characterized in that the two cylindrical lenses 4c are arranged side by side.
[0011]
That is, the reflecting surface of the reflecting mirror 2 is divided into three parts vertically as shown in FIG. 2 when viewed from the front, and a part of the reflecting surface having two elliptical focal points such as a central spheroid. Center reflective surfaces 2a and 2b formed in a strip shape so as to extend toward the side of the light source 3, upper reflective surfaces 2c and 2d formed further above, and lower reflective surfaces 2e and 2e formed below. 2f. The upper reflecting surfaces 2c and 2d are composed of an upper left reflecting surface 2c and an upper right reflecting surface 2d, and the lower reflecting surfaces 2e and 2f are composed of a lower left reflecting surface 2e and a lower right reflecting surface 2f. The reflecting surfaces 2a and 2b, the upper reflecting surfaces 2c and 2d, and the lower reflecting surfaces 2e and 2f are integrally formed.
[0012]
The projection lens 4 is focused in the vicinity of the second focal point where the reflected light from the central reflecting surfaces 2a and 2b converges from the light source 3 corresponding to the central reflecting surfaces 2a and 2b formed as part of the spheroid. The first cylindrical lens 4b and the second cylindrical lens 4c are arranged side by side in addition to the aspherical lens 4a arranged to have
[0013]
Here, each of the first cylindrical lens 4b and the second cylindrical lens 4c is formed in the same convex lens shape as the aspherical lens 4a and the horizontal section is rectangular and the vertical section is formed in a horizontally elongated bowl shape as a whole. Yes. Therefore, the focal points of the first cylindrical lens 4b and the second cylindrical lens 4c are not a point but a linearly extending line, and the transmitted light has a condensing function in the vertical direction but has a condensing function in the horizontal direction. It does not have.
[0014]
The upper left reflecting surface 2c and the lower left reflecting surface 2e of the reflecting mirror 2 are relative to the optical axis Z of the central reflecting surfaces 2a and 2b so as to reflect the light from the light source 3 toward the first cylindrical lens 4b. The optical axis is inclined to the left side, for example, formed as part of an elliptical reflecting surface in which the light source 3 is in the vicinity of the first focal point and the second focal point is the focal point of the first cylindrical lens 4b. Yes.
[0015]
Similarly, the upper right reflecting surface 2d and lower right reflecting surface 2f of the reflecting mirror 2 reflect the light from the central reflecting surfaces 2a and 2b so as to reflect the light from the light source 3 toward the second cylindrical lens 4c. The optical axis is inclined to the right with respect to the axis Z. For example, a part of an elliptical reflecting surface in which the light source 3 is set near the first focus and the second focus is set as the focus of the second cylindrical lens 4c. It is formed as.
[0016]
Here, the reason why the reflecting mirror 2 and the projection lens 4 are configured in this way is that a so-called C-8 type incandescent bulb in which this type of projector-type lamp 1 has a filament stretched in the axial direction from the rear of the reflecting mirror 2. The structure is inserted in the direction of the optical axis, and the reflected light from the central reflecting surfaces 2a and 2b on which a long image is projected next to the filament is used to radiate far away, so the central reflecting surfaces 2a and 2b are spheroidal surfaces. A part of the reflecting surface having two elliptical focal points is formed in a band shape, and an aspherical lens 4a is installed so as to have a focal point in the vicinity of the second focal point, and the reflected light is transmitted to the aspherical lens 4a. This is for forming an irradiation pattern with high condensing property by being incident.
[0017]
On the other hand, since the reflected light from the upper reflecting surfaces 2c and 2d and the lower reflecting surfaces 2e and 2f on which the long image of the filament is projected is desired to be diffused to the left and right, the light from the upper left reflecting surface 2c and the lower left reflecting surface 2e The reflected light is made incident on the first cylindrical lens 4b, and the reflected light from the upper right reflecting surface 2d and the lower right reflecting surface 2f is made incident on the second cylindrical lens 4c, and is condensed in the vertical direction and diffused in the horizontal direction. To get light.
[0018]
FIG. 3 is a vertical sectional view showing a main part of the second embodiment of the projector-type lamp according to the present invention. The projector-type lamp 11 includes a reflection surface 12a having two elliptical focal points such as a spheroid. A reflecting mirror 12; a light source 3 such as a halogen bulb or a metal halide lamp disposed near the first focal point of the reflecting surface 12a of the reflecting mirror 12; and a focal point near the second focal point where the light from the light source 3 converges. And a shade 5a for adjusting the light distribution characteristics near the focal position of the aspheric lens 4a. The process up to this point is the same as that of the conventional example.
[0019]
Here, in the present embodiment, a reflecting surface obtained by dividing the reflecting mirror 12 into three parts when viewed from the front, that is, a central reflecting surface 12a having two elliptical focal points such as a central spheroid, and further on the upper surface thereof. The projection lens 4 is composed of the upper reflection surface 12b formed and the lower reflection surface 12c formed in the lower portion, and the projection lens 4 is formed from the light source 3 corresponding to the central reflection surface 12a formed as a part of the spheroid. In addition to the aspherical lens 4a disposed so as to have a focal point in the vicinity of the second focal point where the reflected light from the central reflecting surface 12a converges, a first cylindrical lens 4b and a second cylindrical lens 4c are arranged in parallel above and below. In the first embodiment, an example in which the cylindrical lenses 4b and 4c are arranged side by side is shown. However, in the present embodiment, an example in which these are arranged side by side is shown. Further, shades 5b and 5c are provided in the vicinity of the focal positions of the first cylindrical lens 4b and the second cylindrical lens 4c in order to adjust the light distribution characteristics in the same manner as the aspherical lens 4a.
[0020]
FIG. 4 shows a light distribution pattern of the projector-type lamp 11 configured as described above, and has a good visibility as a headlamp for driving a car, that is, a condensing characteristic emitted from the aspherical lens 4a. A long irradiation characteristic is obtained in which the distance is brightly illuminated by the high irradiation pattern A and the front brightness is suppressed by the irradiation pattern B diffused in the horizontal direction emitted from the upper and lower cylindrical lenses 4b and 4c. It is what
[0021]
Further, the shape of the aspherical lens 4a of the projection lens 4 can be formed as shown in FIG. 5, that is, the aspherical lens 4a having a circular front view is first designed as shown in FIG. The aspherical lens 4a has an aspherical lens 4a ′ having a substantially quadrangular shape when viewed from the front by cutting off the upper and lower and left and right ends of the aspherical lens 4a in the horizontal and vertical directions along the cut line C as shown in FIG. It is also possible.
[0022]
Further, by appropriately cutting the aspheric lens in this way, for example, as shown in FIG. 6A, the first cylindrical lens 14b and the second cylindrical lens 14a are cut into the aspheric lens 14a whose left and right end portions are cut by a plane parallel to the optical axis. It is possible to arrange the cylindrical lenses 14c in close contact with each other, and to integrate them.
As a result, it is possible to realize a projection lens shape with a novel design that is excellent in design, and to differentiate the appearance.
[0023]
Further, as shown in FIG. 6B, the first cylindrical lens 24b and the second cylindrical lens 24c are in close contact with the aspherical lens 24a whose upper and lower end portions are cut in the horizontal direction on the plane parallel to the optical axis. If they are arranged side by side or integrated in a state, the whole becomes a horizontally long rectangular shape as viewed from the front, and the design is more surprising, and the appearance can be further differentiated.
[0024]
In each of the above embodiments, the example has been described in which the optical axis of the cylindrical lens is set in the same direction as the optical axis of the aspherical lens. However, the projector-type lamp 31 of the third embodiment shown in FIGS. As described above, it is possible to set the optical axis of the cylindrical lens by tilting it toward the side of the vehicle body, and an aspheric lens 34a with the optical axis facing the front is installed on the center side of the vehicle body. A cylindrical lens 34b is provided on the side surface of the vehicle body (right side in the drawing) with the optical axis inclined to the side surface side (right side of the drawing). Further, shades 35a and 35b are provided in the vicinity of the focal positions of the aspheric lens 34a and the cylindrical lens 34b, respectively, in order to adjust the light distribution characteristics.
[0025]
At this time, the reflecting mirror 32 includes a central reflecting surface 32a and upper and lower reflecting surfaces 32b provided above and below the central reflecting surface 32a. The central reflecting surface 32a is an elliptical reflecting surface as in the first embodiment. A part is formed in a band shape, the light source 33 is installed in the vicinity of the first focal point, and the aspherical lens 34a is installed so as to have the focal point in the vicinity of the second focal point. The far side is illuminated brightly by the highly condensing irradiation pattern A emitted from the spherical lens 34a. Further, the upper and lower reflection surfaces 32b positioned above and below the central reflection surface 32a are inclined rightward with respect to the optical axis of the central reflection surface 32a so that the light from the light source 33 is reflected toward the cylindrical lens 34b. For example, it is formed as a part of an elliptical reflecting surface such that the light source 33 is in the vicinity of the first focal point and the second focal point is the focal point of the cylindrical lens 34b. As shown in FIG. 9, this cylindrical lens is formed. With the irradiation pattern B ′ that is diffused in the left-right direction emitted from 34 b, an irradiation characteristic that can suppress the near brightness is obtained.
[0026]
In the third embodiment, a cylindrical lens 34b is provided on the right side to obtain diffused light to the left in the irradiation direction as shown in FIG. 9, but conversely, diffused light to the right in the irradiation direction. In order to obtain the above, a cylindrical lens 34b is provided on the left side so that diffused light to the left is obtained from a headlamp installed on the left side of the automobile, and diffused light on the right side is obtained from a headlamp installed on the right side of the automobile. It is to make.
[0027]
In addition, as shown in FIG. 5, the aspherical lens 34a can be formed in a substantially square shape by cutting the top, bottom, left and right, and formed integrally with the cylindrical lens 34b. At this time, if the joint portions 34c of the two are formed so as to be connected by gradually changing the lens surfaces of each other, a headlamp shape excellent in design and matched to the vehicle body design can be realized. Further, if a dummy portion that does not allow the reflected light to enter the joint portion 34c is formed, the irradiation pattern is not adversely affected.
[0028]
In each of the above embodiments, the example using the cylindrical lens has been described. However, the present invention is not limited to this example. For example, as in the fourth embodiment shown in FIGS. The horizontally long lens 44b can be formed integrally with the aspherical lens 44a. In this case, the focal point of the horizontally long lens 44b is also curved, and the shade 45a provided on the aspherical lens 44a is flat. However, the shade 45b provided in the horizontally long lens 44b is formed in a curved surface shape.
Similarly to the third embodiment, as shown in FIG. 5, the aspherical lens 44a is formed in a substantially rectangular shape in front view by cutting the upper and lower and left and right ends, and is formed integrally with the horizontally long lens 44b. It is also possible. Further, if the joint portion 44c of the both is formed so as to be connected by gradually changing the lens surfaces of each other, a headlamp shape that is more excellent in design and matched to the vehicle body design can be realized. Further, if a dummy portion that does not allow the reflected light to enter the joint portion 44c is formed, the irradiation pattern is not adversely affected.
[0029]
【The invention's effect】
As described above, according to the present invention, the reflecting mirror has a central reflection formed such that at least a part of an elliptical reflecting surface such as a spheroid having a light source as a first focal point extends toward the side of the light source. The projection lens is divided into a surface, an upper reflective surface formed above the central reflective surface, and a lower reflective surface formed below the central reflective surface, and the projection lens is a second focal point of the central reflective surface. The aspherical lens is disposed so as to have a focal point in the vicinity, and at least one horizontally long lens arranged in parallel above and below or on the left and right of the aspherical lens. The horizontally long lens has the same vertical cross section as the aspherical lens. A projector-type run that is a convex lens and has a cross-sectional shape that extends along a straight line or a curve, and is formed so that reflected light from the upper and lower reflecting surfaces is incident on the horizontally long lens. As a result, it is possible to obtain an excellent effect of obtaining a highly visible irradiation characteristic as a headlamp for traveling light distribution that suppresses the brightness in the front within the shape of the light distribution characteristic and brightly illuminates far away. . In addition, since the projection lens is composed of an aspheric lens and a horizontally long lens, it has a large light emitting area and excellent visibility from oncoming vehicles, and it is also possible to produce design differences for each vehicle type. The effect is that the degree of freedom in terms of surface is also excellent.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a main part of a first embodiment of a projector-type lamp according to the present invention.
FIG. 2 is a front view showing the reflecting mirror of FIG. 1;
FIG. 3 is a vertical sectional view showing a main part of a second embodiment of a projector type lamp according to the present invention.
FIG. 4 is a diagram showing a light distribution pattern according to a second embodiment of the present invention.
FIGS. 5A and 5B are perspective views showing an example of an aspheric lens, in which FIG. 5A is an example of a circular shape when viewed from the front, and FIG. 5B is a substantially rectangular shape when viewed from the front by cutting the top, bottom, left and right ends of FIG. It is an example.
6A and 6B are perspective views showing an example in which a projection lens is integrally formed, in which FIG. 6A is an example in which only the left and right end portions of an aspheric lens are cut and integrated, and FIG. In this example, the upper and lower surfaces of the spherical lens are further cut and integrated into a rectangular shape in front view.
FIG. 7 is a perspective view showing a main part of a third embodiment of a projector type lamp according to the present invention.
8 is a horizontal sectional view of FIG.
FIG. 9 is a diagram showing a light distribution pattern according to a third embodiment of the present invention.
FIG. 10 is a perspective view showing a main part of a fourth embodiment of a projector type lamp according to the present invention.
11 is a horizontal sectional view of FIG.
FIG. 12 is a vertical sectional view showing a conventional example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Projector type lamp 2 ... Reflecting mirror 2a, 2b ... Center reflecting surface 2c, 2d ... Upper reflecting surface 2e, 2f ... Lower reflecting surface 3 ... Light source 4 ... Projection lens 4a ... Aspherical lens 4b …… First horizontal lens (first cylindrical lens)
4c …… Second horizontal lens (second cylindrical lens)

Claims (9)

In a projector-type lamp including a light source, a reflecting mirror, a projection lens, and a shade provided as necessary, the light source is a C-8 type incandescent lamp or metal halide lamp in which the orientation of the filament is along the optical axis direction The reflecting mirror has at least a central reflecting surface formed in a band shape in which a part of an elliptical reflecting surface such as a spheroid having at least the light source as a first focal point extends toward a side of the light source, and the center The projection lens is divided into three parts: an upper reflection surface formed at the upper part of the reflection surface and a lower reflection surface formed at the lower part of the central reflection surface, and the projection lens has a focal point near the second focal point of the central reflection surface. And at least one horizontally long lens arranged in parallel above and below or on the left and right of the aspheric lens. Flip horizontal section extended along the cross-sectional shape to a straight line or curve convex lens shape is a rectangular semi-cylindrical shape, the Horizontal the upper reflective surface and a lower reflective surface has an optical axis with respect to the optical axis of the central reflecting surface It is formed as a part of an elliptical reflecting surface inclined in the direction in which the lens is disposed, and is formed so that reflected light from the upper reflecting surface and the lower reflecting surface is incident on the horizontally long lens. Projector type lamp.   The projector-type lamp according to claim 1, wherein the aspherical lens and the horizontally long lens of the projection lens have the same optical axis.   The aspherical lens of the projection lens is installed on the center side of the vehicle body with the optical axis facing the front, the horizontally long lens is installed on the vehicle side surface side with respect to the aspherical lens, and the optical axis is inclined on the side surface side of the vehicle body. The projector-type lamp according to claim 1, wherein the projector-type lamp is provided.   4. The projector-type lamp according to claim 1, wherein the aspherical lens of the projection lens has left and right ends cut in a vertical direction along a plane parallel to the optical axis.   2. The projection lens according to claim 1, wherein the aspherical lens of the projection lens is formed in a substantially square shape when viewed from the front by cutting the upper and lower and left and right ends in a horizontal and vertical direction on a plane parallel to the optical axis. 3. The projector-type lamp according to 3.   6. The projector-type lamp according to claim 4, wherein the projection lens is arranged in parallel with the cut surface of the aspheric lens and the side surface of the horizontally long lens being in close contact with each other.   7. The projector type lamp according to claim 6, wherein the aspherical lens and the horizontally long lens of the projection lens are integrally formed.   8. The joint portion between the aspherical lens and the horizontally long lens of the projection lens is formed so as to be connected integrally by gradually changing the surface of each lens, and is integrally formed. Projector-type lamp.   9. The projector type lamp according to claim 8, wherein a dummy portion that does not receive reflected light is provided at a joint portion between the aspherical lens and the horizontally long lens of the projection lens.

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