JPH11329005A - Lamp - Google Patents

Abstract

(57) [Summary] [PROBLEMS] In lamps, those that follow the conventional configuration are unlikely to give a change in appearance, so that novelty in design cannot be obtained, so that appealing power is insufficient, and furthermore, performance is further improved. It is also difficult to improve the quality, and solving these points has been an issue. SOLUTION: According to the present invention, second focal points F3A and F3B are formed into a ring shape as a rotating compound inclined elliptical reflecting mirror 3, and a ring-shaped cylindrical lens 4 is combined with each of the ring-shaped second focal points. By adopting the lamp 1 thus configured, a novel appearance is given by the shape of the ring-shaped cylindrical lens 4 in terms of design, and a further different appearance can be obtained depending on whether or not the lens surface is colored. In terms of performance, the provision of the central aspherical lens 6 further improves the luminous flux utilization rate for the light source 2 and makes it possible to realize a bright lamp 1 and solves the above-mentioned problems which have occurred in the conventional lamp.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lighting device, and more particularly, to a lighting device such as a head lamp and a fog lamp for a vehicle, a signal lighting device such as a tail lamp and a turn signal lamp for a vehicle, or An object of the present invention is to provide a configuration of a lamp suitable for a road traffic signal light, a railway signal light, and the like.

[0002]

2. Description of the Related Art FIGS. 5 to 7 show examples of the configuration of a conventional lamp of this type. First, in a lamp 90 shown in FIG. 5, a light source 91 is disposed at a focal position as a basic configuration. A parabolic reflector 92, and a lens 93 with a lens cut 93a. The parallel parabolic reflector 92 obtains parallel light reflected by the mirror 93 and converts the reflected light to a lens 93. The light is appropriately diffused by the cut 93a to obtain light distribution characteristics.

In the lamp 80 shown in FIG. 6, a parabola having the light source 81 as a focal point appears in a vertical section when the lamp 80 is mounted, and a straight line appears in a horizontal section (as shown). It is composed of a composite reflection surface 82 in which a plurality of parabolic column reflection surfaces are composited, and a lens 83 which is not cut and is transparent, and the composite reflection surface 82 itself has a light distribution characteristic. What you get.

Further, in a lamp 70 shown in FIG. 7, a spheroidal reflecting surface 72 having a light source 71 as a first focal point, a complex elliptical surface, an elliptical free-form surface, and an aspheric lens 73 are required. Irradiating light is obtained by enlarging and projecting the light source image generated by focusing on the second focal point with the aspherical lens 73. At this time, unnecessary portions are shaded by the shade 74. By covering, the required shape of the light distribution characteristics is obtained. still,
The lamp 70 adopting the elliptical reflecting surface 72 is called a projector type.

[0005]

However, in the above-described conventional configuration, in the configuration of the lamp 90 shown in FIG. 5, the lens cut 93a is required to have a high optical power, so that the lens 93 is thick. The change in thickness becomes large, and as a result, the transparency deteriorates, and there is a problem that an appearance excellent in transparency and depth, which is currently preferred in the market, cannot be obtained.

[0006] In the lamp 80 shown in FIG.
Since the lens 83 is transparent without being subjected to lens cutting, an appearance with excellent transparency can be certainly obtained.
2, the light distribution characteristics are formed, so that there is a problem that the formation of the light distribution characteristics is restricted, for example, it is difficult to secure the lateral width of the light distribution characteristics.

Further, in the lamp 70 shown in FIG.
Along with the problem that the depth becomes deep and the installation becomes difficult, the outer diameter of the aspherical lens 73 becomes small,
When this lamp 70 is employed as a headlight, there is a problem that the visibility from an oncoming vehicle is poor because the light emitting area is small.

[0008] In addition, the lamps 70 to 90 having the above-mentioned conventional configuration.
Are widely used, it is difficult to differentiate from others, it is difficult to obtain novelty in terms of design, and in the above-described conventional lamps 70 to 90, the luminous flux Since the utilization rate depends on the depth, there is also a problem that the efficiency is reduced when the thickness is reduced due to the demand of the market or the like.

[0009]

According to the present invention, as a specific means for solving the above-mentioned conventional problems, a focal point is arranged on the central axis of the bulb and near the light source, passes through the first focal point and passes through the center of the bulb. A first ellipse having a second focal point arranged on a long axis appropriately inclined from the axis, and similarly to the outside of the second focal point of the first ellipse on a long axis appropriately inclined through the first focal point. A second ellipse having a second focal point disposed thereon and, if necessary, a third ellipse having a second focal point disposed further outside thereof, each ellipse illuminating the light from the light source with the lamp. A rotating compound inclined ellipsoidal reflecting mirror formed by rotating the combined ellipse about the central axis of the bulb and combining them on the same plane so as to generate effective reflected light in the directions; The optical axis having a focal point near the second focal point It is an object of the present invention to provide a lamp characterized by comprising a plurality of ring-shaped cylindrical lenses obtained by rotating the cross-sectional shape of each aspherical lens to be substantially parallel and rotating about the bulb central axis as an axis. Is the solution.

[0010]

Next, the present invention will be described in detail based on an embodiment shown in the drawings. FIG. 1 and FIG. 2 show a first embodiment of a lamp 1 according to the present invention. This lamp 1 basically includes a light source 2 such as an incandescent lamp, a halogen lamp, a discharge lamp, and a rotating compound inclined elliptic surface reflection. It comprises a mirror 3 and ring-shaped cylindrical lenses 4 (A, B) corresponding to the number of oblique ellipses combined with the rotating complex oblique ellipsoidal reflecting mirror 3.

The light source 2 comprises a bulb 2a made of a glass tube or the like, and a light emitting source 2b such as a filament located on a bulb central axis X which is the central axis of the bulb 2a. The reflecting mirror 3 is formed with reference to the bulb center axis X and the light emitting source 2b.

In the present invention, when forming the rotating compound inclined elliptical surface reflecting mirror 3, first, a plurality of ellipses having the position of the light emitting source 2b as a first focal point are set. At this time, the number of the ellipses may be two, or may be three if necessary, for example, by increasing the light emitting area of the lamp 1. However, in the first embodiment, in order to simplify the description, An example in which two ellipses are formed, that is, a first ellipse B3A and a second ellipse B3B will be described (see FIG. 2).

As described above, the first ellipse B3A has the position of the light source 2b as the first focal point F1, and the major axis Y3A is appropriately inclined with respect to the valve center axis X. The second focal point F3A is set on the long axis Y3A with an appropriate distance between the focal points. Similarly, in the second ellipse B3B, the position of the light emitting source 2b is set as the first focal point F1, and the major axis Y3B is appropriately inclined with respect to the bulb center axis X. The second focal point F3B is positioned on the major axis Y3B. Is set. At this time, the first ellipse B3A and the second ellipse B3B are set on the same plane.

Then, from each of the first ellipse B3A and the second ellipse B3B obtained as described above, a portion that reflects light from the light emitting source 2b in a direction suitable for irradiation as the lamp 1 is selected. Then, rotation about the central axis X of the bulb is performed, thereby forming a rotating compound inclined elliptical reflecting mirror 3. Therefore, in setting the inclinations of the long axes Y3A and Y3B and setting the positions of the second focal points F3A and F3B, adjustment is performed so as to achieve the above object.

The ring-shaped cylindrical lens 4 is formed by setting the focal point at the second focal point F3A of the first ellipse B3A and making the optical axis Z3A substantially parallel to the central axis X of the bulb. The first ring-shaped cylindrical lens 4A corresponding to the first ellipse B3A can be obtained by assuming the cross-sectional shape of the aspherical lens described above, and rotating this cross-sectional shape about the valve center axis X. Thus, a second ring-shaped cylindrical lens 4B corresponding to the second ellipse B3B is also obtained.

At this time, the first ring-shaped cylindrical lens 4A corresponding to the first ellipse B3A and the second ring-shaped cylindrical lens 4A corresponding to the second ellipse B3B.
If B is connected and integrated by the lens holder portion 4a to form the ring-shaped cylindrical lens 4, the number of parts can be reduced and the molding process can be simplified, which is a preferred embodiment.

When the lamp 1 is actually assembled, the ring-shaped cylindrical lens 4
The position where (4A, 4B) is provided ranges from a position where the focus of the aspherical lens is made coincident with the second focal points F3A and F3B according to the set light distribution characteristics, to a position which is the front end of the aspherical lens. It is assumed that the adjustment is made within the range.

By configuring the lamp 1 as described above, the image of the light emitting source 2b reflected on the rotating compound inclined ellipsoidal reflecting mirror 3 becomes a ring-shaped second focal point F3A,
Focusing is performed at the position of F3B, and a double ring shape is formed. Since the images of the ring-shaped light emitting sources 2b are projected in the irradiation direction by the ring-shaped cylindrical lenses 4A and 4B, each of which has a ring-shaped focal point, the ring-shaped light distribution characteristics are basically reduced. Will be obtained.

However, in this type of lamp 1, the light distribution characteristic is generally that the image of the light emitting source 2 b is enlarged and projected, so that the central portion where light is not distributed is also separated from the lamp 1 by an appropriate distance. As a result, light from the surroundings turns around,
As a result, a circular light distribution characteristic is obtained. At this time,
If the ring-shaped shade 5 is formed along the ring-shaped second focal points F3A and F3B and shields unnecessary portions on the light distribution characteristics, the shape of the light distribution characteristics can be freely changed.

In the first embodiment, in addition to the above-described basic configuration, a central aspheric lens 6 is provided for the purpose of further improving the use efficiency of light from the light source 2. The central aspheric lens 6 has a hole 4b located at the center of the first ring-shaped cylindrical lens 4A, the optical axis of which coincides with the valve central axis X, and the focal point F6 is set to the light source
b.

In this way, the central aspheric lens 6 can also use, as irradiation light, light emitted from the light emitting source 2b in a direction not captured by the rotating compound inclined elliptical reflecting mirror 3. Further, when the central aspheric lens 6 emits light, almost the entire surface of the ring-shaped cylindrical lens 4 emits light, and the aesthetic appearance at the time of lighting is also improved. It is also possible to provide a central shade 7 corresponding to the central aspheric lens 6. Further, a reflex reflector or the like may be installed in place of the central aspherical lens 6.

The ring-shaped shade 5 or
When the ring-shaped shade 5 and the central shade 7 are provided, the surfaces of the shades 5 and 7 facing the lenses 4 and 6 are colored, for example, with the same color as the vehicle body color of the vehicle to which the lamp 1 is attached. In other words, when not lit, such as in the daytime, these colored shades 5 and 7 are magnified and viewed by the lenses 4 and 6 and can be viewed as the vehicle-colored lamp 1. At this time, if the lens holder portion 4a of the ring-shaped cylindrical lens 4 is also colored in the same color, the effect can be further enhanced.

Similarly, if colored in black, the lenses 4 and 6 are viewed as black when the light source 2 is not lit, so that, for example, sunlight enters from the surfaces of the lenses 4 and 6. The occurrence of so-called pseudo-lighting is also reduced, so that false recognition can be prevented, for example, when used as a traffic light. Further, at this time, it is more effective if the emission color of the lamp 1 is set by the cap-shaped filter 10 and the lenses 4 and 6 are colorless as described below.

FIG. 3 shows a second embodiment of the lamp 1 according to the present invention. In this second embodiment, the light emitting source 2b has a focal point F8 corresponding to the hole 4b of the ring-shaped cylindrical lens 4. A rotating parabolic reflecting mirror 8 is provided. Therefore, the reflected light from the rotating parabolic reflector 8 radiated from the hole 4b becomes a parallel light, and the hole 4b is appropriately diffused to the parallel light, for example, a prism cut or a fish-eye cut. A prism lens 9 having a lens cut is provided.

In FIG. 3, reference numeral 10 designates the above-described cap-shaped filter. The cap-shaped filter 10 is formed in a cap shape and covers the light source 2 and is colored. The light from the light source 2 is colored, or frost processing is performed, and the light from the light source 2 is appropriately diffused to eliminate uneven illuminance. Note that the cap-shaped filter 10 can be freely applied to the lamp of the first embodiment.

FIG. 4 shows a third embodiment of the present invention in a main part. As is clear from the above description, in the lamp 1, at least the first ring-shaped cylindrical lens 4A and the second ring Cylindrical lens 4B
Is provided, and in some cases, a central aspherical lens 6 is provided.

Since both the first ring-shaped cylindrical lens 4A and the second ring-shaped cylindrical lens 4B have the shape of an aspheric lens in the cross section passing through the bulb center axis X, this type of general lamp is used. The lens used is thick. Also, the central aspherical lens 6 is similarly thick. For example, when the ring-shaped cylindrical lens 4 and the central aspherical lens 6 are to be formed of resin, problems such as sink marks are likely to occur.

Therefore, in the third embodiment, all of the first ring-shaped cylindrical lens 4A, the second ring-shaped cylindrical lens 4B, and the central aspherical lens 6, or a desired one of them is Fresnelized, Ring-shaped Fresnel lens 4A ', second ring-shaped Fresnel lens 4
B ', an aspherical Fresnel lens 6', etc. At this time, if the pitch of Fresnelization is set to be relatively wide, about 3 mm, a transparent feeling and shine can be obtained as if it were crystal glass. It is also effective in improving the beauty.

[0029]

According to the present invention having the above-described structure of the lamp, first, in terms of design, a double (or triple) ring-shaped cylindrical lens and a central portion are provided regardless of whether they are lit or not. With the presence of a spherical lens,
It is possible to provide a novel design that has never been seen before, and can claim a difference from the conventional type of lighting fixtures.

Further, if the lens holder is made opaque and the shade is also colored, it is possible to realize a lamp having a different color between when it is lit and when it is not lit, such as a vehicle body color lamp. If the lens and the central aspherical lens are made into Fresnel lenses, an appearance like a crystal glass can be provided.In other words, according to the present invention, there are a large number of design variations given to lamps, and the product is extremely improved in commercialization. This has the same effect.

In terms of performance, since the reflecting mirror is formed as a rotating compound inclined elliptical surface, the depth becomes shallower, and the whole lamp becomes thinner and the installation effect is improved.
Further, by forming an image of light from one light source on the ring-shaped second focal point, the temperature of the ring-shaped cylindrical lens can be lowered, the resin can be formed into a resin, and an excellent effect of cost reduction can be obtained.

Further, by providing a central aspherical lens in the hole or by providing a paraboloid of revolution, most of the light from the light source can be used as irradiation light, and the light flux utilization rate for the light source is improved. As a result, it is possible to obtain an excellent effect of improving the performance as a bright lamp, and to achieve an excellent effect of increasing the light emitting area and improving the visibility from an oncoming vehicle.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a first embodiment of a lamp according to the present invention in a partially exploded state.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a cross-sectional view showing a main part of a second embodiment of the lamp according to the present invention.

FIG. 4 is a sectional view showing a main part of a third embodiment of a lamp according to the present invention.

FIG. 5 is a sectional view showing a conventional example.

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

FIG. 7 is a sectional view showing still another conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Lamp 2 ... Light source 2a ... Bulb 2b ... Emission source 3 ... Rotating compound inclined ellipsoidal reflecting mirror 4 ... Ring cylindrical lens 4A ... First ring cylindrical lens 4B ... Second ring shape Cylindrical lens part 4 '... Ring-shaped Fresnel lens 5 ... Ring-shaped shade 6 ... Central aspherical lens 6' ... Aspherical Fresnel lens 7 ... Central shade 8 ... Rotating parabolic reflecting mirror 9 ... Prism lens 10: Cap-shaped filter X: Central axis of valve Y: Long axis Z: Optical axis of ring-shaped cylindrical lens

Claims (10)

[Claims] 1. A first ellipse having a focal point disposed on a central axis of a bulb and near a light source, a second focal point disposed on a long axis passing through the first focal point and appropriately inclined from the central axis of the bulb. ,
Similarly, a second ellipse in which a second focal point is disposed outside the second focal point of the first ellipse on a long axis that is appropriately inclined through the first focal point, and a second ellipse further outward if necessary. A third ellipse of bifocals is combined with a third ellipse such that each ellipse combines light from the light source on the same plane to produce effective reflected light relative to the illumination direction of the lamp. A rotating compound inclined elliptical reflecting mirror formed by rotating an ellipse around the valve central axis, and having a focal point near a second focal point of each of the ellipses and making the optical axis substantially parallel to the valve central axis. A lamp comprising a plurality of ring-shaped cylindrical lenses obtained by rotating the cross-sectional shape of each aspheric lens about the bulb central axis as an axis. 2. The position of each of the ring-shaped cylindrical lenses is set such that a second focal point of the ellipse is in a range from a focal point of the aspherical lens to a front end. The lamp according to 1. 3. A ring-shaped shade for passing at least a part of reflected light and direct light is provided in the vicinity of a second focal point where each of the rotating compound inclined elliptical reflecting mirrors has a ring shape. The lamp according to claim 1 or 2, wherein 4. An aspheric lens having a focal position near the light source is disposed in a hole formed at the center of the ring-shaped cylindrical lens corresponding to the first ellipse. Item 2. The lamp according to Item 2. 5. At least a part of reflected light and direct light passes between the vicinity of the second focal point where each of the rotating compound inclined elliptical reflecting mirrors has a ring shape and between the aspheric lens and the light source. 5. The lamp according to claim 4, wherein a ring-shaped shade is provided. 6. The hole according to claim 4, wherein, in addition to the aspherical lens, a central reflecting mirror having a paraboloid of revolution having a focal position near the light source is provided. Lights. 7. When only the ring-shaped cylindrical lens is provided, when the ring-shaped cylindrical lens is provided, and when the ring-shaped cylindrical lens and the aspherical lens are provided, at least one of them is formed as a Fresnel lens. The lamp according to any one of claims 1 to 6, characterized in that: 8. The ring-shaped shade and the lens holder are colored with a color other than the color of the ring-shaped cylindrical lens.
The lamp according to any of the above. 9. A hole formed in the center of the ring-shaped cylindrical lens corresponding to the first ellipse has a central reflecting mirror having a paraboloid of revolution near the light source as a focal point, and a reflection from the central reflecting mirror. The lamp according to claim 1, further comprising a prism lens that diffuses light. 10. A cap-shaped filter for diffusing or coloring light from the light source is provided between the light source and the rotating compound inclined elliptical reflecting mirror and the central reflecting mirror. The lamp according to any one of claims 1 to 9.