JP2003016813A - Projector type lamp - Google Patents

Abstract

(57) [Abstract] (with correction) [Problem] To improve the visibility of a headlight for traveling light distribution, an illumination characteristic that suppresses the brightness in front and illuminates a distant place brightly within the shape of the light distribution characteristic. Get. SOLUTION: A reflecting mirror 2 has a light source 3 as a part of an elliptical reflecting surface.
Central reflecting surface 2 formed so as to extend toward the side of
a, 2b, upper reflecting surfaces 2c, 2d formed above the central reflecting surfaces 2a, 2b, and lower reflecting surfaces 2e, 2f formed below the central reflecting surfaces 2a, 2b. The projection lens 4 includes an aspheric lens 4a disposed so as to have a focal point near the second focal point of the central reflection surfaces 2a and 2b, and horizontally long lenses 4b and 4c arranged side by side with the aspheric lens 4a. And the projector-type lamp 1 formed such that light reflected from the upper reflecting surfaces 2c and 2d and the lower reflecting surfaces 2e and 2f is incident on the horizontally long lenses 4b and 4c.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle headlamp, fog lamp or other lamp,
Specifically, an elliptic reflecting surface having two elliptic focal points such as a spheroid, a light source arranged near the first focal point of the elliptic reflecting surface, and a second focal point on which light from the light source converges. The present invention relates to a projector-type lamp including an aspherical lens arranged so as to have a focal point in the vicinity thereof and a shade arranged as necessary for adjusting light distribution characteristics near the focal position of the aspherical lens.

[0002]

2. Description of the Related Art Generally, a projector type lamp 9 of this type is used.
0 is configured, for example, as shown in FIG. 12. In this projector type lamp 90, a light source 92 is arranged in the vicinity of the first focus f1 of an ellipsoidal reflection surface 91 which is, for example, a spheroidal surface, and this light source 92 is arranged. The 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 is converged.

Further, by providing a shade 94 for passing only a shape having a desired light distribution characteristic and shielding an unnecessary portion in the light flux which converges to the second focus f2, for example, an appropriate light distribution characteristic such as a passing beam is provided. Projector type lamp 90
Will be obtained.

[0004]

However, in such a conventional projector type lamp 90, the light which is once converged at the second focal point f2 and is then radially diffused is projected by the aspherical lens 93 toward the irradiation direction. Therefore, it has superior characteristics in forming the shape of the light distribution characteristic, but the degree of freedom of illuminance distribution in the shape of the light distribution characteristic is low, and for example, visibility as a headlight for traveling light distribution is high. In order to increase the brightness of the light distribution, there is a problem in that it is not possible to obtain an irradiation characteristic that illuminates a distant place while suppressing the brightness in the foreground within the shape of the light distribution characteristic.

Further, the aspherical lens 93 has a small outer diameter, and when this lamp is used as a vehicle headlight, there is a problem that the light emitting area is small and the visibility from an oncoming vehicle is poor.

Further, since the aspherical lens 93 has a circular shape when viewed from the front, and only the aspherical lens 93 can be seen when it is mounted on a vehicle, all the lamps have the same impression. It is impossible to produce a difference in design depending on the vehicle type, and there was a problem that the degree of freedom in terms of design was lacking.

[0007]

As a concrete means for solving the above-mentioned conventional problems, the present invention is a projector type provided with a light source, a reflecting mirror, a projection lens, and a shade provided if necessary. In the lamp, the reflecting mirror has a central reflecting surface formed such that at least a part of an elliptical reflecting surface such as a spheroidal surface having the light source as a first focal point extends toward the side of the light source, and the central reflecting surface. The projection lens has a focal point near the second focal point of the central reflecting surface, which is divided into three parts: an upper reflecting surface formed above the reflecting surface and a lower reflecting surface formed below the central reflecting surface. And an at least one horizontally long lens arranged in parallel above and below or at the left and right of the aspherical lens, and the horizontally long lens has the same vertical cross section as the aspherical lens. A projector type, characterized in that this cross-sectional shape is extended along a straight line or a curved line, and light reflected from the upper reflection surface and the lower reflection surface is incident on the laterally long lens. The problem is solved by providing a lamp.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will now be described in detail based on the embodiments shown in the drawings.

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 is a reflection having two elliptical focal points such as a spheroid. A reflecting mirror 2 having a surface, and the reflecting mirror 2
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 optical disc, and an aspherical lens 4a disposed so as to have a focal point near the second focal point where the light from the light source 3 converges. And a shade (not shown) arranged in the vicinity of the focal position of the aspherical lens 4a for adjusting the light distribution characteristics, if necessary. Up to this point, the process is similar to that of the conventional example.

Here, in the present invention, the reflecting mirror 2 is formed into a reflecting surface which is vertically divided into three parts when viewed from the front, and the projection lens 4 is added to the aspherical lens 4a arranged at the center and the first cylindrical lens. 4b and the second cylindrical lens 4c are arranged side by side on the left and right.

That is, the reflecting surface of the reflecting mirror 2 is vertically divided into three parts as shown in FIG.
Central reflective surfaces 2a and 2b are formed in a band shape so that a part of a reflective surface having two elliptic focal points such as a central spheroidal surface extends toward the side of the light source 3, and is formed on the upper part thereof. The upper reflecting surfaces 2c and 2d and the lower reflecting surfaces 2e and 2f formed on the lower side. In addition,
The upper reflection surfaces 2c and 2d are composed of an upper left reflection surface 2c and an upper right reflection surface 2d, and the lower reflection surfaces 2e and 2f are composed of a lower left reflection surface 2e and a lower right reflection surface 2f, and these central reflection surfaces are formed. 2a and 2b, upper reflecting surfaces 2c and 2d, and lower reflecting surfaces 2e and 2f are integrally formed.

Further, the projection lens 4 has a second focal point at which the light reflected by the central reflecting surfaces 2a, 2b from the light source 3 converges corresponding to the central reflecting surfaces 2a, 2b formed as a part of the spheroidal surface. In addition to the aspherical lens 4a arranged so as to have a focal point in the vicinity, a first cylindrical lens 4b and a second cylindrical lens 4c are arranged side by side on the left and right.

Here, each of the first cylindrical lens 4b and the second cylindrical lens 4c is formed into a convex lens shape with a rectangular horizontal cross section and the same vertical cross section as the aspherical lens 4a. Has been formed. Therefore, the focus of the first cylindrical lens 4b and the second cylindrical lens 4c is not a point but a linearly extending line, and the transmitted light has a condensing effect in the up and down direction but a condensing effect in the left and right direction. It does not have it.

Then, the upper left reflecting surface 2c and the lower left reflecting surface 2e of the reflecting mirror 2 are arranged so that the optical axes of the central reflecting surfaces 2a and 2b are aligned so as to reflect the light from the light source 3 toward the first cylindrical lens 4b. The optical axis is formed to be inclined to the left with respect to Z, and for example, as a part of an ellipsoidal reflection surface in which the light source 3 is near the first focus and the second focus is the focus of the first cylindrical lens 4b. Has been formed.

Similarly, the upper right reflecting surface 2d and the lower right reflecting surface 2f of the reflecting mirror 2 reflect the light from the light source 3 toward the second cylindrical lens 4c.
The optical axes are formed so as to be inclined to the right with respect to the optical axes Z of the central reflecting surfaces 2a and 2b. For example, the light source 3 may be near the first focus and the second focus may be the focus of the second cylindrical lens 4c. It is formed as a part of an elliptical reflecting surface.

Here, the reflector 2 and the projection lens 4 are constructed in this manner because the projector type lamp 1 is a so-called C-8 type incandescent lamp in which the filament is stretched in the axial direction. Since it is a structure that is inserted from the rear side in the direction of the optical axis, and the reflected light from the central reflecting surfaces 2a and 2b where a long image is projected to the side of the filament is used to irradiate the distance, the central reflecting surfaces 2a and 2b are A part of a reflecting surface having two elliptical focal points such as a spheroidal surface 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 reflected light is reflected by the aspherical surface. This is because the irradiation pattern is made incident on the lens 4a and has a high light converging property.

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 vertically long image of the filament is projected, is desired to be largely diffused to the left and right, the upper left reflecting surface 2c and the lower left reflecting surface. The reflected light from 2e 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 they are respectively collected vertically and horizontally. This is to get the light to diffuse into.

FIG. 3 is a vertical cross-sectional view showing a main part of a second embodiment of a projector type lamp according to the present invention. This projector type lamp 11 has a reflection having two elliptic focal points such as a spheroid. Reflector 12 with surface 12a
And a light source 3 such as a halogen bulb or a metal halide lamp arranged 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 the aspherical lens 4a
A shade 5a is provided in the vicinity of the focal position of the aspherical lens 4a to adjust the light distribution characteristics. Up to this point, the process is similar to that of the conventional example.

Here, in the present embodiment, the reflecting mirror 12
When viewed from the front, the reflecting surface is divided into three parts, that is, a central reflecting surface 12a having two elliptic focal points such as a central spheroid, and an upper reflecting surface 12 formed on the upper part thereof.
b and a lower reflecting surface 12c formed on the lower side, the projection lens 4 is formed by the central reflecting surface 12a from the light source 3 corresponding to the central reflecting surface 12a formed as a part of the spheroid. In addition to the aspherical lens 4a arranged so as to have a focal point near the second focal point where the reflected light converges, a first cylindrical lens 4b and a second cylindrical lens 4c are vertically arranged side by side. In the first embodiment, an example is shown in which the cylindrical lenses 4b and 4c are arranged side by side, but in the present embodiment, an example is shown in which they are arranged side by side vertically. 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, respectively, in order to adjust the light distribution characteristics similarly to the aspherical lens 4a.

FIG. 4 shows a light distribution pattern of the projector type lamp 11 constructed as described above.
As a headlamp for traveling of an automobile, the irradiation pattern A having a good visibility, that is, a high condensing property emitted from the aspherical lens 4a illuminates a distant place brightly, and the left and right emitted from the upper and lower cylindrical lenses 4b and 4c. By the irradiation pattern B diffused in the direction, a horizontally long irradiation characteristic in which the front brightness is suppressed can be obtained.

Further, the aspherical lens 4 of the projection lens 4 is used.
It is also possible to form the shape of a as shown in FIG. 5, that is, first, an aspherical lens 4a having a circular shape in front view is designed as shown in FIG.
It is also possible to cut off the upper and lower ends and the left and right ends on the planes horizontal to the optical axis along the cut lines C in the left and right and up and down directions to form an aspherical lens 4a 'having a substantially quadrangular shape in a front view as shown in FIG.

Further, by appropriately cutting the aspherical lens in this manner, for example, as shown in FIG. 6A, the first cylindrical lens 14b is formed on the aspherical lens 14a whose left and right ends are cut along a plane horizontal to the optical axis. The second cylindrical lens 14c and the second cylindrical lens 14c can be arranged in close contact with each other, and they can be integrated. As a result, it is possible to realize a projection lens shape with a novel design that is also excellent in design, and it is also possible to differentiate the appearance.

Further, as shown in FIG. 6 (b), the upper and lower ends are further cut in the horizontal direction with respect to the optical axis to the aspherical lens 24a, the first cylindrical lens 24b and the second cylindrical lens 24c. If they are placed side by side or integrated in a state of being in close contact with each other, the whole becomes a horizontally long rectangular shape when viewed from the front, and the design becomes even more surprising, further differentiating the appearance.

In each of the above-mentioned embodiments, the description has been given of an example in which the optical axis of the cylindrical lens is set in the same direction as the optical axis of the aspherical lens, but the projector type of the third embodiment shown in FIGS. 7 to 8 is used. Like the lamp 31, it is also possible to set the optical axis of the cylindrical lens by inclining it to the side surface side of the vehicle body, and install an aspherical lens 34a with the optical axis facing the front side on the center side of the vehicle body. Lens 34a
The cylindrical lens 34 is set so that the optical axis is tilted toward the side surface of the vehicle body (right side in the drawing) toward the side surface side of the vehicle body (right side in the drawing).
b is provided. Shades 35a and 35b are provided near the focal positions of the aspherical lens 34a and the cylindrical lens 34b, respectively, in order to adjust the light distribution characteristics.

At this time, the reflecting mirror 32 has a central reflecting surface 32a.
And the upper and lower reflective surfaces 32b provided above and below with the central reflective surface 32a sandwiched therebetween. The central reflective surface 32a has a part of an elliptic reflective surface formed in a strip shape as in the first embodiment. 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. As shown in FIG. The high irradiation pattern A illuminates the distance brightly. The upper and lower reflective surfaces 32b located above and below the central reflective surface 32a are tilted to the right with respect to the optical axis of the central reflective surface 32a so that the light from the light source 33 is reflected toward the cylindrical lens 34b. The cylindrical lens is formed as a part of an ellipsoidal reflection surface such that the light source 33 is near the first focus and the second focus is the focus of the cylindrical lens 34b. As shown in FIG. With the irradiation pattern B ′ that is emitted from 34b and is diffused in the left-right direction, it is possible to obtain an irradiation characteristic in which the front brightness is suppressed.

In the third embodiment described above, the cylindrical lens 34b is provided on the right side to obtain diffused light to the left side in the irradiation direction as shown in FIG. 9, but on the contrary to the right side in the irradiation direction. In order to obtain diffused light of, a cylindrical lens 34b is provided on the left side, and diffused light to the left side is obtained from a headlamp installed on the left side of the vehicle.
The diffused light to the right is obtained from headlamps installed on the right side of the vehicle.

Further, as shown in FIG. 5, the aspherical lens 34a may be formed in a substantially square shape in front view by cutting the top, bottom, left and right, and may be formed integrally with the cylindrical lens 34b. At this time, if the joint portions 34c of both are formed so that their lens surfaces are gradually changed to be connected to each other, a headlamp shape having a better design and matching a vehicle body design can be realized. Also, this joint 3
By forming a dummy portion that does not allow reflected light to enter 4c, the irradiation pattern is not adversely affected.

In each of the above-described embodiments, an example using a cylindrical lens has been described, but the present invention is not limited to this. For example, a curved line is formed as in the fourth embodiment shown in FIGS. Horizontal lens 4 wrapped around
It is also possible to form 4b integrally with the aspherical lens 44a. In this case, the focal point of the horizontal lens 44b also becomes a curve, and the shade 45a provided on the aspherical lens 44a has a flat plate shape. The shade 45b provided on 44b is formed in a curved shape. Further, as in the third embodiment, as shown in FIG. 5, the aspherical lens 44a is formed into a substantially quadrangular shape in front view by cutting the upper and lower ends and the 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 both is formed so that the lens surfaces thereof are gradually changed to be connected to each other, a headlamp shape having a better design and matching a vehicle body design can be realized. In addition, if a dummy portion that does not allow reflected light to enter is formed on the joint portion 44c, the irradiation pattern is not adversely affected.

[0029]

As described above, according to the present invention, at least a part of an ellipsoidal reflecting surface such as a spheroidal surface having a light source as a first focal point extends toward the side of the light source. The central reflection surface is formed, an upper reflection surface is formed above the central reflection surface, and a lower reflection surface is formed below the central reflection surface. The aspherical lens is arranged so as to have a focal point in the vicinity of the second focal point of the surface, and at least one laterally long lens arranged in parallel above and below or to the left and right of the aspherical lens. This is a convex lens having the same shape as an aspherical lens, and has a cross-sectional shape that extends along a straight line or a curved line, and is formed so that the reflected light from the upper reflecting surface and the lower reflecting surface is incident on the laterally long lens. The effector type lamp has the excellent effect of providing highly visible irradiation characteristics as a headlight for traveling light distribution that suppresses the brightness in the foreground within the shape of the light distribution characteristics and illuminates a distant place brightly. It is a thing. In addition, since the projection lens is composed of an aspherical lens and a landscape lens, it has a large light emitting area and excellent visibility from oncoming vehicles, and it is also possible to create design differences depending on the vehicle type. It has the effect of being excellent in terms of flexibility.

[Brief description of 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.

FIG. 3 is a vertical sectional view showing an essential 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 of a second embodiment of the present invention.

FIG. 5 is a perspective view showing an example of an aspherical lens, (a)
Is an example of a circular shape when viewed from the front, and (b) is an example where the upper, lower, left, and right ends of (a) are cut to form a substantially quadrangular shape when viewed from the front.

FIG. 6 is a perspective view showing an example in which a projection lens is integrally formed, FIG. 6A is an example in which only the left and right ends of an aspherical lens are cut and integrated, and FIG. This is an example in which the upper and lower parts of the spherical lens are also cut to integrate the whole 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.

FIG. 8 is a horizontal sectional view of FIG.

FIG. 9 is a diagram showing a light distribution pattern of 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]

1 ... Projector type lamp 2 ... Reflector 2a, 2b ... Central reflective surface 2c, 2d ... upper reflecting surface 2e, 2f ... Lower reflective surface 3 ... Light source 4 ... Projection lens 4a ... Aspherical lens 4b ... first horizontal lens (first cylindrical lens) 4c …… Second horizontal lens (second cylindrical lens)

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) // F21W 101: 10 F21M 3/12 Z F21Y 101: 00 F term (reference) 3K042 AA08 AC01 AC06 AC07 BB05 BB06 BB13 BC03 BC09 BD04 BE08 BE09

Claims (9)

[Claims] 1. A projector-type lamp comprising a light source, a reflecting mirror, a projection lens, and a shade provided if necessary, wherein the reflecting mirror is an ellipse such as a spheroid having a substantially first focus on the light source. A central reflective surface formed so that a part of the system reflective surface extends toward the side of the light source, an upper reflective surface formed on the central reflective surface, and a lower part formed on the central reflective surface. And a lower reflecting surface, and the projection lens is arranged side by side with the aspherical lens arranged so as to have a focal point near the second focal point of the central reflecting surface and above and below or to the left and right of the aspherical lens. At least one lateral lens, the lateral lens has an upper and lower cross-section that is the same convex lens shape as the aspherical lens, and has a cross-sectional shape that extends along a straight line or a curved line. And projector lamp, characterized in that the formation of the light reflected from the lower reflective surface to be incident toward the lateral length lens. 2. 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. 3. The aspherical lens of the projection lens is installed on the center side of the vehicle body with its optical axis facing the front, and the laterally long lens is installed on the vehicle body side surface side of the aspherical lens and the optical axis is on the side surface of the vehicle body. The projector type lamp according to claim 1, wherein the projector type lamp is installed so as to be inclined to the side. 4. The projector-type lamp according to claim 1, wherein the aspherical lens of the projection lens has its left and right ends cut in the vertical direction along a plane that is horizontal to the optical axis. 5. The aspherical lens of the projection lens is formed in a substantially quadrangular shape in a front view by cutting the upper, lower, left and right end portions in the left, right, up and down directions along a plane that is horizontal to the optical axis. The projector type lamp according to any one of claims 1 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 aspherical lens and the side surface of the laterally long lens in close contact with each other. . 7. The aspherical lens and the laterally long lens of the projection lens are integrally formed.
The described projector-type lamp. 8. A joint between the aspherical lens and the laterally long lens of the projection lens is formed integrally so as to have a shape in which the lens surfaces are gradually changed and connected. The projector type lamp according to claim 7. 9. The projector-type lamp according to claim 8, wherein a dummy portion which does not allow reflected light to enter is provided at a joint portion between the aspherical lens and the laterally long lens of the projection lens.