JPS63160102A - Lamp apparatus for vehicle - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] Field of Industrial Application] The present invention relates to a vehicle lamp installed in a vehicle such as an automobile, and particularly relates to a lamp for illumination such as a headlamp or an auxiliary headlamp. be.

4. Prior Art There is a conventional vehicle lamp of this type as shown in FIG. light bulb 12 in position
By aligning the filaments 13 and irradiating the diffused light rays from the filaments 13 forward as parallel rays, the front lens 14 is cut into a prism or the like to obtain desired light distribution characteristics.

[Problems to be Solved by the Invention] However, the conventional vehicle lamp is basically provided with a reflector 11 on the rear side in the irradiation direction, and the brightness of the lamp depends on the size of the reflector 11. , i.e. filament 1
Since it is determined by the luminous flux capture rate from 3, when trying to obtain a brighter lamp with the same light bulb, the above reaction e.
The A-mirror 11 has to be enlarged, and for this reason, the lamp has to be deep, creating a problem that it is difficult to install it on a vehicle.

Means for Solving Problem K] The present invention provides specific means for solving the above-mentioned conventional problems, in which the filament position of the light bulb is improved in a vehicle lamp having a housing and a front lens that also serves as a main reflecting mirror. The light bulb includes a pair of ellipsoidal reflecting mirrors having a first focal point approximately at , and a second focal point near the reference line, which is a horizontal extension of the filament, and approximately equidistant on the left and right sides. According to the above-described aspect, there is provided a vehicle lamp characterized in that a main reflecting mirror is disposed below the light bulb, and a main reflecting mirror corresponding to the filament position and the second focal point is provided on the back side of the light bulb. This solves the problems of the conventional technology.

K Embodiment Next, the present invention will be described in detail based on an embodiment shown in the drawings.

FIG. 1 is a front view of a vehicle lamp 1 according to the present invention, and FIG. 2 is a side sectional view of the same lamp 1. As shown in FIG.

Unlike conventional lamps in which the light bulb 2 is installed approximately at the center of the lamp, the light bulb 2 is installed at an inclined position near the bottom end, and the filament 3 of this light bulb 2 is positioned at the first focal point F, respectively.
A pair of ellipsoidal reflecting mirrors 4a and 4b, which are shared by F, are arranged on the front lower surface side of the light bulb 2. At this time, the second focal points F and F of the ellipsoidal reflecting mirrors 4a and 4b are on the reference line X, which is an extension line of the filament 3 in the horizontal direction, and the ellipsoidal reflecting mirrors 4a and 4b are located on the reference line They are assumed to be equidistant. With this arrangement, the ellipsoidal reflectors 4a and 4b are connected to the filament 3.
virtual images 3a and 3b are focused on their respective second focal points F SF . At this time, by forming, for example, a parabolic cylindrical main reflecting mirror 5 on the back side of the light bulb 2 using the reference line X as an optical reference, a real image of the filament 3 and two virtual images 3a, Reference numeral 3b irradiates light forward using this main reflecting mirror 5. Appropriate light distribution characteristics can be achieved by applying a lens cut 1 to the front lens 6, which is numbered on the front surface side of the light bulb 2 in the irradiation direction. be done.

What has been described above is the basic outline and operation of the present invention, and then a detailed explanation will be given with reference to preferred embodiments. First, the ellipsoidal reflecting mirror 4a.

The position of the first focus of 4b is basically the filament 3
It may be located at any position in the throat, for example at the center point, but preferably at the farthest end from the position where each ellipsoidal reflector is installed, that is, at the right side of the ellipsoidal reflector 4a. is the first focal point F at the left end to the filament 1. 1, the virtual image 3a will be generated above the reference line X as shown in FIG. If it is a reflective surface, the reflected light will have a property that it will contain almost no component upward from the horizontal, and this type of vehicle lamp will not dazzle oncoming vehicles and can be preferable as a light distribution.

Next, the main stage Ijlt5 will be explained. The shape of its reflecting surface can be freely selected depending on the intended use of the lamp, but two representative ones will be explained here.

FIGS. 1 and 2 are examples of a parabolic cylindrical surface with the reference line Since the light beams are parallel and are not affected in the left-right direction, it is easy to obtain light distribution characteristics suitable for a lamp such as an auxiliary headlamp that emphasizes horizontal spread rather than central illuminance. On the other hand, in the vehicle lamp 1A shown in FIGS. 3 and 4, the back surface of the filament 3, where the direct light from the filament 3 is most efficiently reflected, is a parabolic object whose focal point is the position of the filament 3. It is formed as a surface 5a, and parabolic cylindrical surfaces 5b are formed at both ends thereof.
, 5C are connected, and by forming the main reflecting mirror 5A in this way, the reference line The second focal point F.2 and F12 are also adjusted.
By doing this, the main reflecting mirror 5A is formed by the paraboloid 5a.
Due to the action of the parabolic cylinder surfaces 5b and 5C directed slightly inward, the light gathering ability in the left and right direction is higher than that shown in FIGS. 1 and 2, and the center of the light distribution becomes even brighter. It has a so-called centered light distribution characteristic, making it suitable for headlights that illuminate the front more brightly. Incidentally, according to the results of experiments conducted by the inventor and the results of simulations using a large-sized computer to accomplish this invention, the width of the paraboloid 5a is 2.
It is preferable that the width be less than 0. If the width is wider than this, the light gathering ability will be excessive and the light will be focused at a short distance, resulting in a decrease in the irradiation distance.
It has been found that when providing the paraboloid 5a, it is preferable in terms of light distribution characteristics to perform a lens cut on the front lens 6 at a position directly facing the paraboloid 5a.

Moreover, the lamp 1 of the present invention is configured as described above.
The main stage mirror 5 and the front lens 6 are arranged so that they have an opening at the bottom, as shown in FIG. 2, for example. It is possible to form it in one piece.

By doing so, in the vehicle lamp 1 of the present invention, light from the upper half of the filament 3 is directly reflected by the main reflecting mirror 5, and light from the lower half is reflected by a pair of ellipsoidal reflecting mirrors 4a and 4b as a virtual image. 3
a, 3b, which is reflected by the main reflecting mirror 5, giving flexibility in the design of the main reflecting mirror 5 as a lighting device having virtually multiple light sources, and allowing the lighting device 1 to be reflected without reducing efficiency.
This will reduce the thickness of the

In addition, what is indicated by the reference numeral 7 in the figure is a hood for preventing the radiation of direct light that may dazzle and be harmful to oncoming vehicles.

[Effects of the Invention] As explained above, the present invention provides a vehicle lamp with the filament position of the light bulb being approximately the first focal point, being near the reference line which is the horizontal extension of the filament, and having the left and right sides approximately equal. A pair of ellipsoidal reflectors having second focal points at distant positions are disposed below the light bulb, and on the back side of the light bulb, there are mirrors corresponding to the filament position and the second focus. By having a main reflecting mirror, this lamp has three images: a real image formed by light from the upper half of the filament, and two virtual images located approximately equidistant from the filament formed by light from the lower half. As a light source,
- Even if each main reflecting mirror is made small, the overall illuminance does not decrease, and this type of light is thin and has the excellent effect of providing flexibility in mounting it on a vehicle. It is.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway front view showing an embodiment of a vehicle lamp according to the present invention, FIG. 2 is a cross-sectional view taken along the line ■-■ in FIG. 1, and FIG. 4 is a schematic plan view showing the main reflecting mirror of the embodiment shown in FIG. 3, and FIG. 5 is a cross-sectional view showing a conventional example. . 1.1A...Vehicle lamp 2...Light bulb 3...Filament 4a, 4b...Ellipsoidal reflector 5.5A... Main reflecting mirror 5a...paraboloid 5b, 5c...parabolic cylindrical surface 6...front lens 7...hood F
, F...First focus F, F...Second focus X, XA...Reference line

Claims (7)

[Claims] (1) In a vehicle lamp that has a housing, a main reflector, and a front lens, the filament position of the light bulb is approximately the first focal point, is near the reference line that is a horizontal extension of the filament, and the left and right sides are approximately equal. A pair of ellipsoidal reflectors each having a second focal point at a distance from each other is disposed below the light bulb, and a pair of ellipsoidal reflectors having a second focal point located at a distance from each other is disposed below the light bulb. A vehicle lamp characterized by being provided with a reflecting mirror. (2) The vehicle lamp according to claim (1), wherein the main reflecting mirror is formed with a parabolic cylinder surface. (3) The main reflecting mirror is formed of a paraboloid in the center and parabolic cylindrical surfaces intersecting or touching both ends of the paraboloid. (1)
Vehicle lights listed in section. (4) The vehicle lamp according to claim (3), wherein the paraboloid in the central portion has a horizontal width of 20 mm or less. (5) The front lens at a position directly facing the paraboloid in the central portion is provided with a lens cut.
) Vehicle lights listed in item 2. (6) The first focal point of each of the pair of ellipsoidal reflectors is located near the farthest end of the filament from the position where each of the ellipsoidal reflectors is provided. A vehicular lamp according to claim 1 to claim 5. (7) The vehicular lamp according to claims (1) to (6), wherein the main reflecting mirror and the front lens are integrally formed.