JPS59201301A - Headlight 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 The present invention relates to an automobile headlamp, and more particularly to an automobile headlamp which has been improved to be suitable for flat headlamps. The headlamp has a structure in which a lamp is installed near the focal point of a single parabolic mirror of revolution, and a lens is installed in front of it, but with such a simple structure, it is difficult to fit the headlamp into a limited space. If you try to store it, the amount of luminous flux that can be used effectively will decrease, and especially if you try to configure a flat headlamp, the effective luminous flux will decrease.

In order to eliminate these problems, an automotive electric light reflector is equipped with a medium-low main body that has a non-circular front opening through which light passes during use, a rear opening for receiving the light source, and an internal reflective surface. The reflective surface includes: (a) a pair of first reflective portions each disposed on opposite sides of the back opening and extending laterally of the body toward the front opening and spaced apart from the back opening; b) a pair of second reflective parts disposed between each of the first reflective parts and the rear opening; and (c) a second reflective part disposed above the rear opening between the pair of first reflective parts. 3 reflecting parts, the second and third reflecting parts.
An automobile electric light reflector has been proposed in which each of the reflectors has a focal length shorter than the focal length of each of the first reflectors, but there are technical difficulties as follows.

In other words, during normal driving, automobile headlights have two main lights: a main light that illuminates the front sound almost horizontally, and an auxiliary light that illuminates the vehicle's own lane slightly downward to avoid dazzling oncoming vehicles. This switching is done by using the main filament and sub-filament properly, but in the reflector with the above configuration, the hot zone of the auxiliary light and the cut line of the auxiliary light are the same reflection. Since it is formed by a surface, there is little freedom in design and it is difficult to obtain a good light distribution pattern. Further, it is difficult to increase the oblateness of the overall shape of the headlamp.

The present invention has been made in view of the above-mentioned circumstances, and can be applied to automobile headlamps with a large oblateness ratio to increase the available luminous flux, and can also be applied to flat headlamps with a large lens emitting area. An object of the present invention is to provide a headlamp for an automobile whose depth dimension can be reduced.

In order to achieve all of the above objects, the automobile headlamp of the present invention has a light source installed near the focal point of the reflector, in which the reflective surface of the reflector is placed near the center and at the periphery. , the middle part, and the upper half and the lower half of each of the above areas, and for the reflective surfaces in these six areas: (1) The focal length of the reflective surface in the peripheral area is the upper half. , both the lower halves are set to be approximately equal to the focal length suitable for projecting the photoacoustic parallel light beam forward from the light source (hereinafter referred to as the standard focal length), and (II) the focal length of the reflective surface near the center is , upper half.

Both lower halves should be shorter than the standard focal length. 5.1 (11) The focal length of the reflective surface in the middle part should be an intermediate value between the focal length of the reflective surface near the center and the standard focal length, and (]■ ) The focal positions of the upper halves of the peripheral part and the intermediate part are the same point (hereinafter referred to as reference points), and the focal positions of the lower halves of the peripheral part, near the center, and the intermediate part are the same point. The main feature is that the focal positions of these lower halves are closer to the back than the reference point, and the focal positions of the upper half near the center are closer to the front than the reference point.

Next, an embodiment of the present invention will be described with reference to FIGS. 1 to 14.

FIG. 1(4) is a vertical cross-sectional view of an embodiment of the automobile headlamp of the present invention.

1 is a beam reflector, 2 is a lens provided on the front surface of the reflector, and 3 is a light source Z-2 provided near the focal point of the reflector, which is the main optical axis.

The imaginary line drawn on the surface of reflector 1 is the boundary between several types of rotation/paraboloids that make up the reflector, as will be explained in detail later, but these several types of rotation speed 6 page object surfaces are all centered on the principal optical axis z. −z'e rotation axis.

In this embodiment, H4 halogen pulp having a filament substantially parallel to the main optical axis is used as the light source 3, where 3au is the main filament and 3b is a sub-filament. The supplement filament 3b is provided with a light shielding member 3c, and is masked from downward light projection. 1) is an explanatory view showing the entire arrangement of filaments of the H4 halogen bulb. Main filament 3a and sub filament) 3b both have main optical axis Z
-2 in the direction of the main optical axis, the sub-filament 3b is placed closer to the front (to the left in this figure) of the lamp, and the main filament 3a is placed closer to the rear (rightward) of the lamp.

f, , f, , f are the focal positions of several types of paraboloids of rotation that constitute the reflector 1, as will be explained in detail later.

Figure 2 is a front view of the beam flap l, Figure 3 is the Y-
The Y sectional view and FIG. 4 are the same XX sectional views. 1c is a hole for attaching a light source.

In this embodiment, the reflector 1 is made of a strong planar member, and its inner surface 1a is provided with a reflective surface. When the present invention is fully implemented, the reflector l may be configured to also serve as the lamp housing as in this example, or the lamp housing and the reflector may be configured separately. As in this example, when the lamp 1 also serves as a housing and the reflector is configured, the main optical axis z-z't- When adjusting to the body of the vehicle, the entire vehicle headlamp must be moved to adjust the light. Perform axis adjustment. Furthermore, if a reflector (not shown) is provided separately from the lamp housing, the optical axis can be adjusted by moving only the reflector.

As shown in FIG. 2, the reflective surface of the reflector 1 is divided into six areas in a concave manner. The nine parts with spots are 6 above.
This is a part between areas that does not belong to any area.

The left and right peripheral parts of the reflector 1 are set concentrically with respect to the center point O, and the paraboloid P3. The same P4 k forms, and below it a paraboloid pa IPl. Fully formed. Boundary line between top and bottom 1. ．． 1. The reason why the is asymmetrical is to form a light distribution pattern as will be explained in detail later, and the left and right boundaries t1 and t2 are all set according to traffic regulations (driving on the left or right). do.

In addition, for convenience of explanation of the action and effect, the upper total p of the paraboloid P,
1a, the lower part is named t''ptb.p□, the boundary line of ptb, t, is an imaginary line.

A center part is set around the hole 1c at the center of the reflector l, and a paraboloid Psk is formed in the upper part of the center part, and a paraboloid Pg k is formed in the lower part of the center part.

A concentric middle part is set between the above peripheral part and the center part about the center point O, and a paraboloid P! , the same Pa t'', and the paraboloids p and e the same P are formed at the bottom.For convenience of explanation, the entire upper part p□ and the lower part t'' of the paraboloid P,
Name it ptb. The boundary ffM t4 is a virtual line.

Among the above-mentioned paraboloids P1 to PIO, the focal lengths of the peripheral paraboloids RrPs rPs ePlo are configured to be standard focal lengths. In this example, F=3811
It is 11. When carrying out the entire invention, good results can be obtained when F=30 to 45 ■ under general conditions of use.

The focal length of the central paraboloid Ps = Pi is configured to be shorter than the standard focal length/distance. In this example, F=22a garden. When carrying out the present invention, good results can be obtained by using F-18 to 2511I11 under general conditions of use.

The focal lengths of the paraboloids P*, Ps, and Pt-Pa in the middle part are set to intermediate values between the focal length in the center part and the focal length in the peripheral part. In this example, F=row cod.

When carrying out the entire invention, good results can be obtained under general conditions when F = +A~A.

The focal position of each of the above-mentioned paraboloids P, ~P, 0 is set as follows. That is, the middle part and the peripheral part are the upper paraboloid PH+ PHrP
Let the focal position of P4 be the point f shown in FIG. Then, the lower paraboloid P6 + PT r Pa * Po e
Focus position t1 of Plo is closer to the back than the reference point f above.
In addition, the focal position of the paraboloid P in the upper half near the center is configured to be aligned with the reference point f, and the point f3 that is closer to the front than the reference point f.

In this example, the lower half paraboloid Pa * PT *
Pg +pt, , p,. focal position ftt”, the first
Me10 as shown in ) of the figure.

(Infilament) Align it approximately to the position of 3a. Paraboloids R, Pt, Ps, Pa of the upper half of the middle and peripheral parts
The focal position f1 is set 2 m ahead of f. As a result, the focal point position is slightly in front of the main filament 3a. When carrying out the entire invention, the intervals of the focal points f, , ft are set to 0.5 to 3.5 minutes, and the focal points r, l r
.

Setting the interval to about 2■ gives good results under typical conditions.

If the configuration is as described above or if the light emitted from the light source is reflected by the frefter l, the fifth
A light distribution pattern as shown in Figures to Figures 7 is obtained. Figure 5 shows a light distribution pattern in which the light emitted from the subfilament is reflected by each of the paraboloids P1 to P in the upper half. The projection zone of the light reflected by the surface P1 is shown in correspondence with the zone tFa of the light reflected by the paraboloid PIl. Zone E+b is the reflected light from the upper part p+a of the paraboloid PI, and zone &b is the reflected light from the lower part plb of the paraboloid P. Zones F4a a and F4b are also pea
, , and ptb are supported. The scales attached to the vertical and horizontal axes indicate the entire light direction of the projection 11c1, and represent the angle (unit: degrees) made with respect to the central axis.

The light distribution pattern of the luminous flux emitted from the main filament 3a is shown in exploded form in FIGS. 6 and 7. Figure 6 shows the zones El + island, Es , E4 , E of the luminous flux reflected by the paraboloids P, , Pt , Ps , P4 , PI in the upper half.
sk is shown.

Figure 7 shows the lower half of the paraboloid Pa IF7 +Pa +Po
The zone of the luminous flux reflected by IPIO, Ey, &
, Eo, &o'. As shown in Fig. 1 031C, the position of the main filament 3a is on the paraboloid P.
6~・P. Since it almost coincides with the focal point f, of the paraboloid Pa+Pso, the light fluxes reflected by the paraboloid Pa+Pso together form an almost parallel strong light flux zone Eat. Fully formed. Similarly, the reflected light from the paraboloids Pt and PoVc are together in zone E7+. Fully formed.

The focal point f of the paraboloid p, ~p4 in the upper half forming the zone NI-&k shown in FIG. 6 is slightly forward of the main filament 3a, as described with respect to FIG. Since the position is biased towards the zone E of reflected light.

~ As shown in this figure, the light distribution pattern has a slight tendency to emit light mainly in the upward direction rather than in the horizontal direction. Since the focal point f3 of the paraboloid of revolution P in the upper half near the center is located further forward, the zone EI exhibits a further divergent tendency.

The sub-filament 3b is provided in front of the main filament and is located at the focal point fI of the paraboloids P□ to P4 in the upper half! Since the subfilament is located in front of the subfilament, the light distribution of the subfilament shown in FIG. 5 shows a tendency to diverge downward from the horizontal direction. However, the paraboloid P,.

Since P has a longer focal length than the other paraboloids Pt, Ps, and Ps, the shift between the focal point and the light source is less likely to affect the upper and lower parts of the paraboloid P, as shown in the figure. p+a,
Zone E of light reflected at p + b, @ + Elb
The zone of light reflected by the paraboloid P4 exhibits properties close to a parallel light beam, and forms the entire hot zone of the auxiliary light beam.

As shown in FIG. 1A, since the sub-filament 3b is downwardly masked by the light-shielding member 3c, there is no light beam reflected by the paraboloid P to PIG in the lower half.
For this reason, the upper half of the light distribution pattern shown in FIG. 5 is cut off.

The automobile headlamp of this embodiment has the above-mentioned 13
.

Since such a light distribution pattern of the reflected light flux is obtained, the light distribution can be fully adjusted by the lens 21C, and a light projection performance similar to that of a missing light beam can be obtained.

Regarding the auxiliary light that is dimmed in order not to dazzle oncoming vehicles, the light should not be projected upward in the direction of oncoming traffic in the same zone and E as shown in Figure 5.

As shown in Figure 8, the projected light flux Itb + Is
+ Form 7.

In addition, the hot zone of the auxiliary light is determined by using the same zone as zone EIa shown in FIG. 5, and as shown in FIG.
．． ．． The same Li is formed.

A fifth light beam is used as a downward wide beam for auxiliary flashing.
Using the zone Eak shown in the figure, the very projected light beam l5t- of FIG. 10 is formed.

A light distribution pattern for auxiliary light projection as shown in FIG. 11 is obtained by combining the projected light beams shown in FIGS. 8, 9, and 10 described above.

The prism shape of the lens 2 is set so as to obtain the light distribution pattern of the auxiliary light as shown above (FIG. 10).

Thereby, the luminous flux of the main light projection is determined as follows.

FIG. 12 shows the light distribution pattern of the projected light beams ■1 to ■1 formed by the zones E1 to EIl shown in FIG. 6, and FIG. 13 shows the light distribution pattern of the zones E6 to EIO shown in FIG. By combining the light distribution patterns in Figures 12 and 13 of O, which is the light distribution pattern of the projecting light beams 1 to IIO formed by A light distribution pattern of the main light emission suitable for each occasion can be obtained.

As described above, the automobile headlight of this embodiment has two parts: one above and below the central part, and the other above and below the periphery of the middle part 2.

Since the light distribution pattern is formed by ten paraboloids on the left and right, there is a large degree of freedom in design, and a large amount of luminous flux can be utilized even in a headlamp with a large oblateness ratio. Further, even if the lens light emitting area is large, it is easy to design the lens so that the depth dimension is small.

When designing an automobile headlamp by applying the present invention, the peripheral paraboloid PI#P41PII IPIO shown in FIG.
・It is set so that the maximum luminous intensity part of the main light and auxiliary light is formed by , and a wide light projection pattern in the downward direction of the main light and auxiliary light is formed by the paraboloid Ps+P in the center. and the paraboloid Pg in the middle part
, Pa, P? By setting the cut line of the auxiliary light to be formed depending on the pH, it is easy to obtain excellent reflection characteristics. Further, by creating a desired light distribution pattern of reflected light in this manner, a projected light beam having a suitable light distribution pattern can be obtained using a lens with a simple configuration.

As described in detail above, according to the present invention, it is easy to increase the luminous flux to be used in a vehicle headlamp having a large aspect ratio and to fit it within a limited installation space. Further, in a flat automobile headlamp having a large lens emitting area, the depth can be set small and it can be easily accommodated in a narrow space.

[Brief explanation of drawings]

The attached drawings show one embodiment of the automobile headlamp of the present invention, in which FIG. 1 (4) is a vertical longitudinal sectional view, and FIG. 1 (B) is a filament arrangement of H4 halogen pulp. Explanatory diagram shown in ', 2nd
3 is a sectional view taken along the YY line in FIG. 2, and FIG. 4 is a sectional view taken along the XX line in FIG. 2. Figures 5 to 7 are diagrams for explaining the light distribution pattern of reflected light when there is no lens, and Figures 8 to 14 are diagrams for explaining the light distribution pattern of the light beam that has completely passed through the lens. This is a diagram. 1... Reflector, 1c... Hole for attaching the light source, 2.
... Lens, 3... H4 halogen bulb as a light source, 3a... Main filament, 3b... Sub filament, 3c... Light shielding member %P, IP, ~PIo.
... Paraboloid of rotation that constitutes the reflective surface of the reflector, E, -'
-E,...Zone% of light reflected by the above paraboloid
I, ~ItO... A projected luminous flux whose light distribution is modified by a lens. Patent Applicant Ichikoh Industries Co., Ltd. Agent Patent Attorney Tadashi Akimoto Figure 1 (B) -f. Figure 2 Figure 3 Figure 4 Figure 2 Figure 5 6h (71 Figure 8■ 119 Figure 1O Figure

Claims (1)

[Claims] In an automobile headlamp in which all light sources are arranged near the focal point of the reflector, the reflective surface of the reflector is divided into a central area, a peripheral area, and an intermediate area, and A headlamp for an automobile, characterized in that each part is divided into an upper half and a lower half, and each of these six areas has a reflective surface formed by a paraboloid of revolution as shown below. (1) The focal length of the peripheral reflective surface for both the upper and lower halves is a focal length suitable for projecting the light emitted from the light source forward as a parallel beam (hereinafter referred to as the standard focal length). #1
to be approximately equal. (11) The focal length of the reflective surface near the center is in the upper half. Make both the lower half shorter than the standard focal length. diD The focal length of the reflective surface at the intermediate portion is set to a value intermediate between the focal length of the reflective surface near the center and the standard focal length. Ov) The focal positions of the upper halves of the peripheral part and the middle part are all the same point (hereinafter referred to as the reference point). Q) The focal positions of the lower halves of the peripheral area, near the center, and intermediate area are all the same point, and the focal positions of these lower halves are closer to the back than the reference point. (vl) The focal point position of the upper half near the center is set to be closer to the front than the reference point.