JPS59151701A - Headlamp 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 using H4 Hada Genlang as a light source.

FIG. 1 shows an example of this type of automobile headlamp.

A paraboloid of revolution glue/flafter 2 is fixed to the inner surface of a lamp housing 1, an H4-logen lamp 3 is installed near its focal point f, and the front opening of the lamp housing 1 is covered with a lens 4.

1 (The 4 halogen lamp 3 is equipped with a main filament 8a and a sub-filament 3b, and generally both filaments are approximately aligned with the central axis Z-Z of the headlamp, and the main filament) 3m is the focal point of the reflector. fK position.

The light from the main filament 3a mentioned above is mainly used as a main light to illuminate the front when driving at night, and the light from the sub-filament 3b is mainly used as an auxiliary light to illuminate the road in your own lane when you pass an oncoming vehicle. . For this reason, a reflective member 3C is provided below the sub-filament 3b to mask the light directed downward.

In the conventional automobile headlamp configured as described above, the main filament 3m #'i is located near the focal point f of the reflector 2, so the light is reflected as shown by the arrow a+b and directed towards the central axis Z- Projected almost parallel to Z. However, since the subfilament 8b is located in front of the focal point f, the light is reflected as indicated by the arrow a+d and intersects with the central axis z-2.

Projected downward. These projected lights (arrows b and d
) is diffused by a lens 4 as shown in FIG. 2 and formed into a desired light distribution pattern. However, as shown in FIG. 1, the light from the subfilament 3b is reflected as indicated by the arrow cld and concentrated near the A section of the lens 4. This rounding,
There is a risk that the area around the A part of the lens 4 will be overheated when the sub-lineman) 3b is turned on.

Furthermore, in the conventional device described above, almost all of the five reflected lights are directed towards the center of the front, so there is a technical problem in that it is not easy to adjust this into a desired light distribution pattern using a lens. Next, the above problems will be explained in detail.

FIG. 3 shows a conventional glue reflector composed of a single paraboloid of revolution, and for convenience of explanation, one reflecting surface is divided into left part P1 + right part Pg + central upper part P1. Let's consider the lower center P4.

border! 1. ! , is an imaginary line 8, and 2a is an opening for attaching a lamp.

The reflected light from the main linemen) 3a forms a light distribution pattern as shown in FIG. l111 in Figure 84 is the third
The left part of the figure is the area of reflected light by P, and similarly K
Bl * BB + 14 are respectively right part P! - This is the area of reflected light due to upper center PH + lower center P.

Fig. 5 shows the light distribution pattern of the reflected light of sub-lineman) 3b, and shows the light distribution pattern of the light reflected from sub-lineman) 3b. E, are the left part P1s and the right part P! This is the area of reflected light.

If the upper part P3 shown in Fig. 3 is further divided into K P, -11P, .
It will be like this.

S-t, Proverb 2 If you try to correct the light that was intensively reflected toward the center of the front as described above by diffusing it left and right with a lens like the one shown in FIG. 2 to create a desired light distribution pattern.

It is necessary to construct a prism lens with highly uneven surfaces.
This causes problems such as poor moldability of the lens and increased thickness and weight.

The present invention has been made in view of the above-mentioned circumstances, and provides an automobile headlamp using an H4 halogen lamp, a rotating paraboloid shaped flap, and a lens. There is no risk of overheating the unit, and the light distribution pattern of the reflected light matches the desired light projection pattern.
＃′! E'

The light distribution pattern of reflected light is #1#! Once the desired light projection pattern is achieved, it is easy to modify the light distribution using the lens.

Since thinner lenses will be less expensive, it can be expected that the lenses will not only be lighter in weight, but also easier to manufacture.

In order to achieve the above objects, the present invention provides an automobile headlamp which emits a KH4H4 halogen lamp near the focal point of a paraboloid of revolution reflector and a lens is provided at the front opening of the reflector. In the headlight, the reflective surface of the 7-rector is divided into an upper center part, a lower center part, and a left part,
It is divided into the right part.

(1) The left and right parts are composed of paraboloids of revolution.

(11) Upper center and lower center, above left.

When the light source is placed at the focus of the paraboloid of revolution on the right side.

The configuration is such that the reflected light is in a horizontal direction forming an angle θ with the central axis of the headlight, and the value of the angle θ is maximum near the center in the left-right direction, and from the center to the left, It gradually decreases as it moves away to the right.

It is characterized in that it is set to be minimum near the boundary between the left and right parts.

Next, one embodiment of the present invention will be described with reference to FIGS. 6 to 13.

FIG. 6 shows the reflector 2 in the automobile headlamp of the present invention.
7 is a sectional view taken along the Y-Y' line in FIG. 6, and FIG. 8 is a sectional view taken along the X-7 line in FIG.

As shown in Figure 6, the reflective surface of the reflector is adjusted to the left pH.
Right part P1. Upper center part P3 + lower center part P.

Each of these parts is constructed by a paraboloid as shown below. ! 8. ! , is a borderline.

The left part P and the right part P are each formed into a paraboloid of revolution. As a result, the light emitted near the focal point f is
As illustrated by arrow g9g in the figure, the above reflection [I P
arrow g' reflected in the horizontal direction at l and shown in FIG.
1g', it is reflected parallel to the central axis Z-Z.

The upper center P and the lower center P4 are formed into irregular rotation paraboloids as follows. (In the present invention, the term "irregularly rotating paraboloid" refers to a three-dimensional curved surface whose cross section along a vertical plane parallel to the central axis Z-2 is a parabola and whose cross section along a horizontal plane is similar to a parabola.

Since the above-mentioned reflecting surface Pg r P4 has a parabolic vertical cross section, it reflects the light emitted from the vicinity of the focal point f in the horizontal direction as shown by the arrow, as shown in FIG.

The horizontal section of this reflection +11T Pg + P4 smoothly continues to the parabola of the cross section of the reflection surface P, , P, which is a paraboloid of one rotation, as shown in Fig. 8, and as it approaches the central axis Z-ZK, This is done by forming a concave surface with a small radius of curvature (that is, a concave surface with a short focal length).

Therefore, when the light emitted from the focal point f of the paraboloid of one rotation PH*PH is reflected near the boundary line 4, it is reflected at the central axis z- as shown by the arrow h1.
Z and #1 become parallel (that is, the intersection angle with axis z-2 becomes zero at all times #1). As the reflection point approaches the central axis Z-Z, the angle of intersection with the axis z-2 gradually increases as shown by the arrow hlshl..., and the light reflected near the center moves toward the axis z-2 as shown by the arrow hlshl... The intersection angle with is maximum. In this way, the light reflected by the reflecting surface P forms a pattern that is diffused substantially horizontally and laterally.

FIG. 9 shows a vertical longitudinal section of a motor vehicle headlamp constructed as described above and provided with a flap.

FIG. 1.theta. shows a light distribution pattern of the sub-filament constructed as described above or by the flefter.

Area B of reflected light from P1+PgK, which is a paraboloid of revolution
1°E faces almost to the front, area B forms a left cut line L, area E forms a right cut line L, and one reflective surface p, -
1. Area of reflected light due to ps-1 "8-1' E
, -fi is slightly downward K from the horizontal direction and is diffused to the left and right, so that the reflected light before entering the lens has almost the desired light distribution pattern. Here, the areas EIt-1 and Ea-4 are spread left and right as shown by the arrows, ~h,
This is because the light is diffused. Also, the reason why the horizontal direction also moves slightly downward is that, as shown in Figure 7, the light that exits the focal point f becomes horizontal as shown by the arrow g, but the light that exits from the sub-filament located slightly in front of the main filament This is because it points downward as shown by the imaginary arrow h'.

Figure 11 shows the light distribution pattern of the light emitted from the main filament 3a.Since the main filament is located near the focal point f, #1 is reflected in the horizontal direction.The light of the sub-filament shown in Figure 10 is 12th by diffusing the reflected light
The lens shape is set so as to obtain the light distribution pattern of the auxiliary projection light as shown in the figure.

The luminous flux 11+ 11+ Il is the area El *
El * This is the result of adjusting the reflected light of El. As mentioned above, the light distribution pattern of FIG. 10 is a trap of the desired light distribution pattern at t1, so it is sufficient to modify the lens slightly, and therefore, the objective can be sufficiently achieved using a thin lens.

When the reflected light of the main filament shown in Fig. 11 is diffused by the lens set as above, the 13th
A light distribution pattern as shown in the figure is obtained, and 1' has an appropriate hotline and appropriate left and right spread! Excellent main illumination can be obtained due to the horizontal luminous flux.

As described in detail above, the present invention is applied to an automobile headlamp using a [4/-logen lamp, a paraboloid of revolution flap and a lens, and the light of the subfilament is directed to the central part of the lens. Eliminating the risk of overheating the isthmus by concentrating on
In addition, it has an excellent practical effect in that the distribution of the reflected light can be made substantially equal to the desired light projection pattern, making it possible to use a thin lens.

[Brief explanation of the drawing]

Figures 1 to 5 show an example of a conventional automobile headlamp, with Figure 1 being a vertical cross-sectional view, and Figure 2 being a front view of the lens.
Figure 43 is a front view of the beam flapper, and Figures 4 and 5 are charts showing light distribution patterns. 6 to 13 show one embodiment of the automobile headlamp of the present invention, and FIG. 7 is a front view of the 61st threshold beam flap, and FIG. 9 is a vertical longitudinal sectional view, FIG.
13 is a chart showing the light distribution pattern of the projected light flux due to the light of the reflected lament of the main filament, and FIG. 13 is a chart showing the light distribution pattern of the projected light flux due to the light of the main filament. 1...Lamp housing, 2.2'...Reflector, 3...H4 halogen lamp, 3-same main filament, 3b...Same brake lamp), 3e...
・Same reflective material. 4... Lens special pestle applicant Ichikoh Industries Co., Ltd. agent Patent attorney Tadashi Akimoto F\ 1:1 1 mock'1. '7=i+ 1 3 ・ ' 0 4th "j', 4 ・, 6 Figure Y' Figure 7 G'8 Figure 2. Figure 9 Figure 10 Figure 1 + 13th Tol V ・ Procedural amendment ( Spontaneous) January 25, 1980 Director of the Japan Patent Office Kazuo Wakasugi 1, Indication of the case 1984 Patent Application No. 2 Arts No. 2, Title of the invention Automobile headlamp 3, Relationship with the person making the amendment Patent application person i1
．． Place (Residence) 10 J-chome, Higashigotanda, Tokyo Parts Ward / G Name (Name) (013) Ichikoh Kogyo Co., Ltd. 4, Agent 7, Subject of amendment Full text of specification 8, Contents of amendment Invention as shown in the attached sheet The reflective surface of the claimed automotive headlamp is divided into an upper center part, a lower center part, a left part, and a right part. (1) What are the left part and the right part? It consists of a paraboloid of revolution, (
11) The upper center portion and the lower center portion are the left side above. When a light source is placed at the focal point of the paraboloid of rotation on the right side, the structure is such that the reflected light is in a horizontal direction forming an angle θ with the central axis of the headlamp, and the above The angle θ is set so that it is maximum near the center in the left-right direction, gradually decreases as it moves away from the center to the left and right, and becomes minimum near the boundary between the left and right parts. Car headlights. DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automobile headlamp using H4 halogen pulp as a light source. FIG. 1 shows an example of this type of automatic military headlamp, which has a substantially paraboloid of revolution shape 71///1 with a reflective surface 2 formed on its inner surface.
A filament of H4 halogen pulp 3 is installed near the focal point f, and in one such example, a lens 4 is installed at the front opening of the beam flap 1. The H4 halokene pulp 3 comprises a main filament) 3a and a supply lamen) 3b, generally both filaments have a length along the main optical axis Z-ZK, and the main filament 3a is located approximately at the focal point f. The sub-eye (1 and 2) 3b is installed so as to be located in front of the focal point f. The light from the main filament 3a mentioned above is mainly used as a main light to illuminate the front when driving at night, and the light from the sublight filament 3b is mainly used as an auxiliary light to illuminate the road in your own lane when you pass an oncoming vehicle. . Therefore, a light shielding member 3c is placed below the subfilament 3b.
is installed to mask the light directed downward. In the conventional automobile headlamp constructed as described above, the main filament 3a is located near the focal point f of the reflective surface 2, so the light is directed by the arrow a. It is reflected as shown in b and projected almost parallel to the main optical axis z-2 and #1. However, since the sub-filament 3b is located in front of the focal point f, the light is reflected as indicated by the arrow C9d, intersects with the main optical axis z-2, and is projected downward. These projected lights (arrows (d)) are diffused by a lens 4 as shown in Fig. 2 and adjusted to a desired light distribution pattern, but as shown in Fig. 1, the light of the sublight beam (3b) is reflected as shown by arrows c and d and concentrated in the vicinity of section A of the lens 4. For this reason, there is a risk that the vicinity of the A portion of the lens 4 may be overheated when the sublight lamp 3b is turned on. Furthermore, in the conventional device described above, almost all #1 of the 5 reflected lights is directed toward the center of the front, so there is a technical problem in that it is not easy to adjust this to a desired light distribution pattern using a lens. Next, the above problems will be explained in detail. FIG. 3 shows a conventional glue reflector composed of a single paraboloid of revolution, and for convenience of explanation, the reflecting surfaces are arranged on the left side P□, on the right side P2, . It is divided into upper center P31 and lower center P4. Boundary line 21. 2a is an imaginary line, and 2a is an opening for installing pulp. The reflected light from the main linemen) 3a forms a light distribution pattern as shown in FIG. El in FIG. 4 is the area of light reflected by the left side P1 in FIG. Similarly, E, lH31H4 are the areas of reflected light from the right side P, the upper center P, and the lower center P4, respectively. 3 and FIG. 5 shows the light distribution pattern of the reflected light of the sub-line member) 3b, where E□l H2 are the left part P□, respectively. This is the area of light reflected by the right side P2. Further move the upper part P3 shown in Fig. 3 to P3-□l P3-2
The area of each reflected light is E in Figure 5.
It becomes K like l-11E3-2. As mentioned above, the light that is intensively reflected toward the center of the front is spread to the left and right using a lens like the one shown in Figure 2. If you try to correct the desired light distribution pattern by scattering the light, you will have to construct a prism lens with severe concavities and convexities, resulting in problems such as poor moldability of the lens and increased thickness and weight. occurs. The present invention has been made in view of the above-mentioned circumstances, and is an automobile headlamp that uses an H4 no.logenbulb, a rotating paraboloidal flap, and a lens, in which the light of the subfilament is concentrated near the center of the lens. To provide a headlamp for an automobile in which there is no risk of overheating a core part and the distribution turn of reflected light is almost equal to a desired light projection pattern. When the light distribution pattern of the reflected light becomes almost the desired projection pattern, it becomes easy to modify the light distribution using the lens, and a thin lens becomes sufficient, which makes the lens lighter.
It can be expected that manufacturing of lenses will become easier. In order to achieve the above object, the automobile headlamp of the present invention has a main optical axis K G near the focal point of the paraboloid of revolution.
If we position a filament with a length of (H
In an automobile headlamp in which four halogen bulbs are installed in the reflector, the reflective surface of the reflector is divided into an upper center part, a lower center part, a left part, and a right part, and (1) left The square part and the right part are composed of paraboloids of revolution, and (11
) The upper center part and lower center part are on the left side above. When a light source is placed at the focal point of the paraboloid of revolution on the right side,
The configuration is such that the reflected light is in a horizontal direction forming an angle θ with the central axis of the headlight, and the value of the above angle θ is maximum near the center in the left and right direction, and It is characterized by being set so that it gradually decreases as it moves away from the left side and the right side, and reaches a minimum near the boundary between the left side and the right side. Next, one embodiment of the present invention will be described with reference to FIGS. 6 to 13. FIG. 6 is a front view of one embodiment of the reflective surface 2' in the automobile headlamp of the present invention, FIG. 7 is a YY' cross-sectional view of FIG. 6,
FIG. 8 is a sectional view taken along the line x-x'. As shown in Fig. 6, the reflective surface of +77 rector is the left part
1. Right part P, l upper middle part P3. It is divided into a central lower part P4, and each of these parts is formed by a paraboloid like a missing part. ! □ and h are boundary lines. The left part P and the right part P are each formed into a paraboloid of revolution. As a result, the light emitted near the focal point f is
As illustrated by the arrow g+g in the figure, the above reflective surface P1
and is reflected in the horizontal direction by the arrow g'+ shown in FIG.
It is reflected parallel to the main optical axis Z-Z as shown in g/. The upper center P3 and the lower center P4 are formed into irregular rotation paraboloids as follows. (In the present invention, an irregularly rotating paraboloid refers to a three-dimensional curved surface whose cross section along a vertical plane parallel to the central axis Z-Z is a parabola and whose cross section along a horizontal plane is similar to a parabola. The above reflective surface P3. P4 has a parabolic vertical cross section, so as shown in FIG. 7, it reflects the light emitted near the focal point f in the horizontal direction as shown by the arrow. This reflective surface P3. As shown in Fig. 8, the horizontal cross section of P4 smoothly continues with the parabola of the cross section of the reflecting surface pHPffi, which is a paraboloid of rotation, and the radius of curvature decreases as it approaches the principal optical axis z-2 (i.e., the focal point (on a concave surface with a short distance)
It is formed. Therefore, the paraboloid of revolution P1. The light emitted from near the focal point f of P is the boundary line 2. When it is reflected near the main optical axis Z-Z, as shown by the arrow h
1) becomes zero. Then, as the reflection point approaches the main optical axis z-2, the arrow h2. As shown by h3..., the angle of intersection with the main optical axis Z-Z gradually increases, and the light reflected near the center has a maximum angle of intersection with the main optical axis 2-2, as shown by arrow h8. In this way, the light reflected by the reflective surface P3 forms a pattern that is diffused substantially horizontally and laterally. FIG. 9 shows a vertical longitudinal section of a motor vehicle headlamp constructed as described above and provided with a flap. FIG. 10 shows a light distribution pattern of a subfilament constructed as described above or by a flefter. Area E□ of reflected light by pl and p2 which are paraboloids of revolution
. B2 faces almost the front, the left cut line L□ is formed by the area E□, the right cut line L2 is formed by the area E2, and the reflective surface p3-1''
The area E3-□IE3-2 of the reflected light from 3-2 is diffused horizontally and slightly downward, left and right, and the reflected light before entering the lens has an almost desired light distribution pattern. here,
The reason why the areas E3-11 and Ell-2 are diffused left and right is because the light indicated by the arrows h1 to h8 is diffused as shown in FIG. Also, the reason why the horizontal direction also moves slightly downward is that as shown in Figure 7, the light that exits near the focal point f becomes horizontal as shown by the arrow g, but the main filament also exits from the sub-filament located slightly in front of it. This is because the light directed downward as shown by the imaginary arrow h'. FIG. 11 shows a light distribution pattern of light emitted from the main filament 3a. Since the main filament is located near the focal point f, its light is reflected almost horizontally. The lens shape is set so as to diffuse the reflected light of the subfilament shown in FIG. 10 and adjust the light distribution pattern of the auxiliary projection light as shown in FIG. 12. Koshuko □, I2. I3 is area E□, B respectively
2. This was adjusted using the reflected light of B3. As mentioned above, the light distribution pattern in Figure 10 is almost the desired light distribution pattern, so it is sufficient to modify the lens slightly.
Therefore, the objective can be sufficiently achieved using a thin lens. When the lens set as described above diffuses the reflected light from the main filament shown in Figure 11, the 13th
The light distribution pattern shown in the figure can be obtained, with a nearly horizontal light beam having an appropriate hot line and appropriate left and right spread.
Excellent main light emission can be obtained. As described in detail above, the present invention is applied to an automobile headlamp that uses H4 halogen pulp, a rotating paraboloid shaped flap flap, and a lens, so that the light from the subfilament is concentrated in the center of the lens. This has an excellent practical effect in that it eliminates the risk of overheating the core, and also makes it possible to use a thin lens by making the light distribution pattern of the reflected light almost equal to the desired light projection pattern. BRIEF DESCRIPTION OF THE DRAWINGS Figures 1 to 5 show an example of a conventional automobile headlamp, in which Figure 1 is a vertical cross-sectional view, Figure 2 is a front view of the lens, and Figure 3 is a view of the beam flap. Front teeth, FIGS. 4 and 5 are charts showing light distribution patterns. 6 to 13 show embodiments of the automobile headlamp of the present invention, FIG. 6 is a front view of a beam flap, and FIG. 7 is a front view of a beam flap.
The Y-r sectional view in the figure, Figure 8 is the same X-Te sectional view, and the 9th
The figure is a vertical longitudinal sectional view, Figure 10 is a diagram showing the light distribution pattern of light reflected from the sub-filament, Figure 11 is a diagram showing the light distribution pattern of light reflected from the main filament, and Figure 12 is a diagram showing the light distribution pattern of light reflected from the main filament. FIG. 13 is a chart showing the light distribution pattern of the projected light beam due to the light of the filament. FIG. 13 is a chart showing the light distribution pattern of the projected light beam due to the light of the main filament. 1...I+7 reflector, 2.2'...reflection diagram, 3...
・H4 halogen pulp, 3a-same main filament, 3b...same filament, 3C...same light-shielding member, 4...lens patent applicant Ichikoh Industries Co., Ltd. agent Patent attorney Masami Akimoto

Claims (1)

[Claims] In an automobile headlamp, a 1CH4 Rodan 2 lamp is provided near the focal point of a paraboloid of revolution reflector, and a lens is provided at the front opening of the reflector. Divide the surface into an upper central part, a lower central part, a left part, and a right part, (1) The left part and the right part are composed of paraboloids of revolution. (11) The upper central part and the center lower part are the left side above,
・When a light source is placed at the focal point of the paraboloid of revolution on the right side, the reflected light is configured in a horizontal direction that forms an angle θ with the central axis of the headlight, and - the above angle The value of θ is maximum near the center in the horizontal direction.
An automobile headlamp O characterized in that it gradually decreases as it moves further to the right, and is set to a minimum near the boundary between the left and right parts.