JPS6028102A - Lanp implement for automobile - 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 The present invention relates to a lighting device for an automobile, and in particular, includes a front opening RK lens of a multi-stage reflector having a plurality of reflective surfaces in the shape of a paraboloid of revolution, and a light source near the focal point of the reflector. There is an automobile lamp VC which is improved so that the light reflected by the reflector can be effectively utilized in an automobile lamp which is installed in a horizontally long rectangular shape when viewed from the front.

FIG. 1 shows a cross-sectional view of one example of this type of conventional automobile lamp, in which 1 is equipped with a paraboloid of revolution 1a, 2 is a front opening Fffi, and 5 lenses are attached. A lamp as a light source is provided near the focal point of the reflector, and Z-Z indicates the optical axis.

Figure 2 shows the glue flap 1 and lens 2 aligned with the optical axis Z-
It is a front view seen in two directions.

The lens 2 is generally formed with a large number of rectangular prisms 2a arranged vertically and horizontally as shown by broken lines.

On the other hand, the reflector l is generally formed as follows. An opening 1b for attaching a light source lamp is provided near the center point 0, and a central reflective surface I is provided in a circular portion concentric with the center point 0.
C is formed. This central reflecting surface IC three-dimensionally forms a paraboloid of revolution with the optical axis z-2 as its focal axis, and its outline is circular when viewed from the front. The shape defined here refers to the shape projected onto an imaginary plane perpendicular to the optical axis Z-2.A ring-shaped outer reflective surface 1d is concentrically arranged around the above-mentioned central reflective surface IC when viewed from the front. It is formed. This outer reflective surface 1d also forms a paraboloid of revolution in three dimensions.

Conventionally, the focal length of the outer reflective surface 1d is generally set to be larger than that of the central reflective surface IC, and therefore an invalid portion 1e that does not receive light from the light source is provided in a stepped manner between the two.

As shown in Fig. 2, the automotive lamp configured as described above can be easily configured to have a horizontally long rectangular shape when viewed from the front, and to have a relatively small dimension in the optical axis direction. In addition, the light emitted from the light source is reflected forward by the reflector, and the reflected light can be adjusted by the prism 2a of the lens 2 to achieve the desired light distribution, so it can be used for automobile headlamps, fog lamps, etc. Suitable as a lighting fixture.

However, as shown in FIG. 2, a conventional automobile lamp having a reflecting surface in the form of a concentric paraboloid of revolution when viewed from the front has the following technical drawbacks.

(a) In FIG. 2, the central reflective surface 1c and the outer reflective surface 1d are effective parts for the function as a reflector,
1e sandwiched between these is an invalid part. As described above, the boundary line between the effective part and the ineffective part has an arc shape. On the other hand, a large number of prisms 2a formed on the lens 2 each have a rectangular shape.

Therefore, the outline of the light beam reflected by the reflector 1 obliquely intersects with the prism 2a. FIG. 3 is an enlarged view extracted as an example of the prism 2a E shown in FIG. 2 with hatching, and the lower right part of this figure is the effective part that receives the reflected light from the central reflective surface IC. , the upper left part is an invalid part (shown with spots) that does not receive reflected light.

In this way, when the rectangular prism 2a receives the reflected light from the circular reflecting surface when viewed from the front, it is difficult to predict the light distribution in terms of prism design, and it is not easy to control the light distribution by the prism. As a result, there is a lot of waste in utilizing the light beam reflected by the reflector.

(1)) When the reflector is molded from synthetic resin, the left and right contours of the reflector are arcuate, so when attaching it to the reflector block, the assembly force is dispersed, making it difficult to assemble.

The present invention has been made in view of the above-mentioned circumstances, and includes a multi-stage reflector having a plurality of paraboloid-shaped reflective surfaces, a lens provided in front of the reflector, and a light source provided near the focal point of the reflector. It is possible to eliminate the drawbacks of the conventional technology regarding automobile lights that are horizontally rectangular when viewed from the front, to facilitate light distribution prediction in prism design and light distribution control by the prism, and to increase the solid angle at which the luminous flux is used. The object of the present invention is to provide an automobile lamp that can be easily assembled into a reflector block.

In order to achieve the above object, the present invention arranges paraboloids of revolution outward in a substantially symmetrical manner on both the left and right sides of the central paraboloid of revolution, and when these paraboloids of revolution are viewed from the front. It is characterized in that the shape is rectangular, and the focal length is increased sequentially from the paraboloid of revolution at the center to the paraboloid of revolution at the outermost side.

Next, one embodiment of the present invention will be described with reference to FIG.

FIG. 4(A) is a front view of one embodiment of the automotive lamp of the present invention, FIG. 4(B) is a Y-Y5 cross-sectional view (vertical cross-sectional view) of FIG. 4(A), and FIG. C) is the same <X-X sectional view (horizontal sectional view).

Reference numeral 5 designates a flapper constructed by applying the present invention, and reference numeral 5a designates an opening provided in the center for attaching a light source.

A common focal point f is set on the optical axis z-2, and a paraboloid of revolution P1 having a focal length F1 with respect to this focal point position f,
Paraboloid of revolution Pts with focal length F for focal position f
Three paraboloids of revolution, including a paraboloid of revolution P3 having a focal length F3 with respect to the focal position f, are set so that p+<Ft<ps.

The central reflective surface 5b-1 of the reflector 5 is configured along the paraboloid of revolution P1. This central reflective surface 5b-t is
As shown in FIG. 4(A), it is formed into a rectangular shape when viewed from the front.

An intermediate reflective surface 5b-21 is formed on the surface side of the central reflective surface 5b-1 with a step-shaped invalid portion 6a interposed therebetween. This intermediate reflective surface 5b-2 is formed along the above-mentioned paraboloid of revolution P2, and has a rectangular shape when viewed from the front as shown in FIG. 4(A).

Further, an outer reflecting surface 5b-sk is formed along the paraboloid of revolution P1 on the outside of each of the two intermediate reflecting surfaces 5b-2 via an ineffective portion 6b, and its shape when viewed from the front is rectangular. Form.

FIG. 5 is a partially enlarged view of FIG. 4(C). In this diagram,
Cut lines 6a-x and 6b-x are shown in which the invalid portions 6a and 6b are cut along a horizontal plane passing through the optical axis z-2.

Lines obtained by extending these cutting lines 6a-x and 6b-1 toward the center intersect at the bird's edge, and this intersection point f is shifted forward by ΔF compared to the focal point f of the paraboloid of revolution.

With this configuration, when a light source is placed at the focal point f, the light emitted from this light source toward the invalid portion 6b as shown by the dotted line, for example, will be directed to the inner edge 6b-2 of the invalid portion 6b. It is blocked and does not enter the invalid portion 6b.

In this way, the light from the light source does not enter the ineffective parts 6a, 6b, so there is no risk of harmful light being reflected by the ineffective parts 6a, 6b.

In FIG. 5, El is the edge on both sides of the central reflective surface 5b-1. As described above, in this embodiment, the central reflecting surface 5b-1 is formed into a rectangle, so the edge E1 in FIG. 5 (horizontal sectional view) is a straight line parallel to the optical axis z-2. When the central reflecting surface is configured in a circular shape as in the conventional device (FIG. 2), its outer periphery becomes an inwardly arcuate shape as shown by the imaginary line E2. The above edge E2 (this example) and edge E,
(Conventional example) As is clear from the comparison, in this example, the effective reflection area of the central reflection surface is the same as the line E1. Only the part surrounded by the heart is large. Therefore, the effective utilization solid angle of the luminous flux is large.

Next, regarding an embodiment different from the above, the effect of increasing the area-to-area ratio of the effective reflecting surface will be explained using a conventional device under the same conditions as a comparative example.

FIG. 6(A) is a front view of a reflector in a conventional device set forth as a comparative example, and FIG. 6(B) is a front view of a reflector configured to have external dimensions similar to those described above by applying the present invention. Common to both are the height dimension H=so-dou, the total width dimension W=220 mm, and the opening diameter D-36 mm1.

For ease of reading, openings and ineffective areas are shaded.

F21 and F21 are central reflecting surfaces made up of paraboloids of revolution with a focal length of 21111+11, and p30 and F30' are intermediate reflecting surfaces p4 made up of paraboloids of revolution with a focal length of 30 mm.
0 and p40 are focal lengths! There is an outer reflective surface receiver consisting of a 40 mm paraboloid of revolution.

The dimensions of R and ~R4 attached to each reflective surface are R, =
40 mm R2 = 55 mm R, = 70 mm R4 = 98 +nn+ R, -) 10 mm - These dimensional values are as shown in Figure 6 (A) (comparative example) and Figure 6 (B) (of the present invention). This is common to Examples).

As mentioned above, when two glue flaps that can be housed in the same installation space are constructed and their effective areas are compared, the results are as shown in the following table.

From the above table, it can be seen that the effective reflection area increased by about 13% by applying the present invention.

Figure 7 shows an example 5 of a flapper constructed by applying the present invention.
FIG. 2 is a front view for explaining a state in which the lens is combined with a prism lens 2', and corresponds to FIG. 2 of the conventional device. As can be easily understood from this figure, in this embodiment, the edge of the reflected light beam does not obliquely intersect with the unit section of the prism. Therefore, it is easy to predict the light distribution in terms of prism design, and it is easy to control the light distribution by the prism. Furthermore, since the reflector has a rectangular outline when viewed from the front, it is easy to attach it to the reflector block.

As detailed above, according to the present invention, it is easy to predict and control the light distribution in prism design, the solid angle of the luminous flux can be increased, and the reflector can be easily assembled to the reflector block. Excellent practical effects can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a conventional multi-stage reflector type automobile lamp, FIG. 2 is a front view of the same, and FIG. 3 is an enlarged view of the shaded area in FIG. 2. 4 and 5 show one embodiment of the automotive lamp of the present invention, FIG. 4 (4) is a front view, and FIG. 4 (B)
4(C) is a horizontal sectional view, and FIG. 5 is a partially enlarged horizontal sectional view. Figure 6 (A) and (
B) is an explanatory diagram of the effect drawn by comparing a front view of a conventional example and a front view of an embodiment of the present invention, respectively, and FIG. 7 is a front view of an embodiment different from the above. 1... Reflector, 1a... Paraboloid of revolution, 1b...
・Aperture, IC...center reflective surface, 1d...outer reflective surface, 1e...invalid part, 2,2...lens, 2a,
2a...prism, 3...lamp, 5.5'...
Reflector, 5a...Aperture, 5b-1...Central reflective surface, 5b-2...Intermediate reflective surface, 5b-3...Outer reflective surface, 6a, 6b...Ineffective portion. Go to patent application Tadashi Akimoto, Patent Attorney, Ichikoh Industries Co., Ltd. Figure 1! 2nd evil 20'

Claims (1)

[Claims] A lens is provided on the front surface of a multi-stage reflector having a plurality of paraboloid-shaped reflective surfaces, and a light source is provided near the focal point of the reflector. If we sandwich the paraboloid of revolution provided in the section and arrange the paraboloids of revolution outward in a roughly symmetrical manner on both the left and right sides of the paraboloid of revolution, the shape of these paraboloids of revolution when viewed from the front is rectangular. , and the focal length of the paraboloid of revolution is gradually increased from the central paraboloid of revolution to the outermost paraboloid of revolution.