JP2598577B2 - Automotive headlamp - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a headlamp for an automobile, and more particularly to a headlamp in which two lamp bodies each having a bulb mounted on the front surface of a reflector are arranged adjacent to each other.

[0002]

2. Description of the Related Art A conventional headlamp of this type is shown in FIG.
As shown in FIGS. 5 and 16, two lamp bodies 2a and 2b each having a built-in double filament type bulb are arranged adjacent to each other, and the lamp body 2a on the outer side in the vehicle width direction forms a sub beam and a main beam. The inner lamp body 2b forms a main beam. That is, two filaments for the main beam and the sub beam are built in the bulb, and when there is an oncoming vehicle, the outer lamps 2a, 2a are provided as shown in FIG.
Only the sub-beam filament is turned on to form a sub-beam which is not dazzling to oncoming vehicles. When there is no oncoming vehicle, as shown in FIG. 16, all the main beam filaments of the four lamp bodies are turned on and the main beam is turned on. Form a beam.

[0003]

The light distribution pattern (light distribution pattern by the reflector) of the sub-beam in the above-mentioned conventional headlamp is as shown in FIG.
It has a light distribution pattern that can illuminate a wide area in front of the vehicle in a substantially semicircular shape having a clear cut portion. However, since the illumination in the front left and right regions is darker than the front central region, it may be difficult for a driver to see the illumination, and there is a demand for brighter illumination of the front left and right regions. However, if the direction of emitted light is controlled by adjusting the shape of the reflector and the angle of the lens step to expand the light distribution pattern to the left and right, the illuminance of the entire light distribution is reduced by the amount of light that is diffused, and the driver's visibility is rather reduced. There is a problem of getting worse. FIG. 18 is a diagram showing a light distribution pattern of a main beam (a light distribution pattern by a reflector) in a conventional headlamp.

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above-described problems of the prior art, and has as its object to provide an automobile headlamp capable of sufficiently illuminating the front left and right regions without lowering the illuminance in the front central region. .

[0005]

In order to achieve the above object, in a headlamp for an automobile according to the present invention, there is provided a double filament having two filaments for a main beam and a sub beam and a shade for forming a sub beam. Two lamp bodies having a structure in which an expression bulb is mounted on the front surface of a parabolic reflector are arranged adjacently, and the emission of the main beam filament in each lamp body is reflected by the entire reflector to form a main beam. A headlamp for an automobile in which sub-beams are formed by reflection of light, which is not blocked by a shade, of the light emitted from the sub-beam filament in the lamp body, and the left and right sides of the bulb insertion hole of the reflector of one of the lamp bodies On both sides, the shaft is inclined inward in the left-right direction with respect to the valve insertion shaft. It is obtained so as to form a paraboloid.

[0006]

The light emitted from the sub-beam filament of the first lamp body is partially shaded by a shade, and the light reflected by a predetermined effective reflection surface of the reflector is used to distribute light for a normal sub-beam having a clear cut portion. A pattern is formed. The light emitted from the sub-beam filament of the second lamp body is partially shaded by a shade, and the light reflected on a predetermined effective reflection surface including a reflection paraboloid whose axis is inclined in the left-right direction inside the reflector causes the left and right of the pattern to be left and right. The light distribution pattern for the sub beam is formed in which a part of the region is offset outward in the left-right direction. Then, the light distribution patterns for the sub-beams formed by the first and second lamp bodies are combined to form a light distribution pattern for the sub-beams of the headlamp substantially enlarged in the left-right direction.

Light emitted from the main beam filament of the first lamp body is reflected on the entire surface of the reflector to form a normal light distribution pattern for the main beam, and light emitted from the main beam filament of the second lamp body is emitted. The light distribution pattern for the main beam is formed in which the left and right partial regions of the pattern are offset inward in the left-right direction by being reflected by the entire surface of the reflector. Then, the light distribution patterns for the main beam formed by the first and second lamp bodies are combined to form a light distribution pattern for the main beam of the headlamp having a particularly high luminous intensity at the center.

[0008]

Next, an embodiment of the present invention will be described with reference to the drawings. 1 to 13 show one embodiment of the present invention.
1 and 2 are front views of a vehicle to which the headlamp according to the present embodiment is assembled. FIG. 1 shows a state when a sub-beam is turned on, and FIG. 2 shows a state when a main beam is turned on. 3 is a horizontal cross-sectional view of the headlamp on the left side of the vehicle, FIG. 4 is a vertical cross-sectional view of the lamp body on the outside (inside) in the vehicle width direction, FIG. 5 is a front view of a reflector on the outer lamp body, and FIG. A diagram showing a light distribution pattern of a sub-beam formed by
7 is a diagram showing a light distribution pattern of a main beam formed by the reflector, FIG. 8 is a front view of a reflector of a lamp body inside a vehicle in a width direction, and FIG. 9 is a horizontal sectional view of the reflector (a line shown in FIG. 8). FIG. 10 is a diagram showing a light distribution pattern of a sub-beam formed by the reflector, FIG. 11 is a diagram showing a light distribution pattern of a main beam formed by the reflector, and FIG. FIG. 13 is an explanatory diagram illustrating a light distribution pattern of a sub-beam formed by reflectors of two lamp bodies arranged side by side. FIG. 13 shows a light distribution pattern of a main beam formed by reflectors of two lamp bodies arranged side by side. FIG.

In these figures, reference numeral 10A (10
B) is a lamp body having a structure in which bulbs 16, 16 are respectively inserted into bulb insertion holes 15, 15 of a parabolic reflector 18A (18B).
10B is disposed adjacent to the lamp room space formed by the lamp body 12 and the front lens 14. Then, headlamps arranged side by side of the lamp bodies 10A and 10B are arranged on the front portion of the vehicle so as to be symmetric in the left-right direction.

The valve 16 is provided with a filament for the main beam.
17m and 17s filament for sub beam
Double-filament structure with sub-beam filter
Below the filament 17s, there is a sub-beam filament
There is a shade 17d that blocks part of the 17s light emission
I have. And the first lamp book located on the outside in the vehicle width direction
In body 10A, main beam filament 17m is parabolic
Provided so as to match the focal point of the surface-shaped reflector 18A
Have been. Therefore, the main beam filament 17m
Is reflected by the entire reflector 18A, and shown in FIG.
As shown in FIG.
Form a light pattern. On the other hand, filament for sub beam
17s is beyond the focal point of the parabolic reflector 18A.
Slightly forward, the filament 17s emits light
The light going downward is blocked by the shade 17d
And a substantially upper half area of the reflector 18A (1 in FIG. 5).
8A ₁The light reflected by the light distribution crosses each other.
To form the light distribution pattern of the sub-beam shown in FIG.
You.

On the other hand, the lamp body 10B located inside the vehicle width direction also has a parabolic reflector 18B.
The arrangement of the filaments 17m and 17s with respect to the focal point is the same as that of the first lamp body 10A, but the shape of the reflecting surface of the reflector 18B is slightly different from that of the reflector 18A of the first lamp body 10A. That is, as shown in FIGS. 8 and 9, the left and right fan-shaped reflection surface regions 21 and 22 of the valve insertion hole 15 incline the axes L ₂₁ and L ₂₂ with respect to the valve insertion axis L in the left and right direction. It has a parabolic shape. That is, the parabolic fan-shaped reflecting surface areas 21 and 21
2 is a paraboloid centered on the valve insertion axis L (the first
Of the reflector 18A of the lamp body 10A) is inclined inward in the horizontal direction by a predetermined angle θ. The two-dot chain line shown in FIG. 9 indicates the paraboloid position in a state where the axes L ₂₁ and L ₂₂ are not inclined. The light emitted from the main beam filament 17m is reflected by the entire reflector 18B, and the reflected light in the regions (regions indicated by reference numerals 23 and 24) excluding the fan-shaped reflection surface regions 21 and 22 becomes substantially parallel light as shown in FIG. The fan-shaped light distribution patterns indicated by reference numerals 33 and 34 are formed, and the reflected lights in the fan-shaped reflection surface regions 21 and 22 are partially offset from each other in the left-right direction as shown by reference numerals 31 and 32 in FIG. Form a fan-shaped light distribution pattern that is superimposed. That is, as compared with the light distribution pattern of the main beam formed by the reflector 18A of the first lamp body 10A (see FIG. 7), each of the patterns 31 to 31 is a light distribution pattern in which the left and right portions are offset in a direction in which they overlap each other.
The luminous intensity at the central part of the pattern 34 to be superimposed is high.

The light emitted from the sub-beam filament 17s is blocked by the shade 17d from the light directed toward the substantially lower half (the area indicated by reference numeral 24 in FIG. 8) of the reflector 18B. The light reflected by the region forms the light distribution pattern shown in FIG. Reference numerals 41 and 42 denote patterns formed by fan-shaped reflecting surface regions 21 and 22 of the reflector 18B, respectively. The patterns 41 and 42 have an arrangement shape separated in the left-right direction from a pattern 43 formed by the reflecting surface region 23 of the reflector 18B. Has become.

FIGS. 7 and 11 show the main beam.
The light distribution patterns of the main beams produced by the two lamp bodies 10A and 10B shown in FIG. 13 are combined to obtain the light distribution pattern shown in FIG. The light distribution pattern of the main beam has the same shape as the light distribution pattern of the main beam of the conventional headlamp (see FIG. 18), but the luminous intensity at the center of the pattern is particularly higher than at the periphery.
In the sub-beam, the light distribution patterns of the sub-beams formed by the lamp bodies 10A and 10B shown in FIGS. 6 and 10 are combined to obtain the light distribution pattern shown in FIG. The light distribution pattern of this sub-beam has a horizontally elongated shape in which the area below the horizontal line H is enlarged in the left-right direction, as compared with the light distribution pattern of the sub-beam of the conventional headlamp (see FIG. 17). It has been expanded. Also, the pattern in the front central region of the vehicle is formed by combining the pattern made by the first lamp main body 10A and a part 43 (see FIG. 10) of the pattern made by the second lamp main body 10B. The illuminance in the region is equal to or greater than the illuminance of the light distribution pattern created by the conventional headlamp, and is a part of the pattern 4 created by the second lamp body.
The left and right directions are brighter than the conventional light distribution pattern by the extent that the illumination area is expanded in the left and right directions by 1, 42.

FIG. 14 shows another embodiment of the present invention, and is an explanatory diagram for explaining how sub-beams are formed. In the above-described embodiment, the light reflecting surfaces 21 and 22 for expanding the light distribution pattern in the left-right direction are formed on the reflector 18B of the lamp body 10B on the inner side in the vehicle width direction. In the embodiment, the lamp body 1
The left and right arrangement of 0A and 10B is changed, that is, the lamp body 10B having the function of expanding the light distribution pattern of the sub-beam in the left and right direction is arranged outside in the vehicle width direction.

[0015]

As is apparent from the above description, according to the automotive headlamp according to the present invention, the light emission of the sub-beam filament of the first lamp body allows the normal sub-beam for the clear sub-cut to be formed. Since a light distribution pattern is formed, and a light emission pattern of the sub-beam filament of the second lamp body forms a horizontally long light distribution pattern that is continuous laterally outward of the light distribution pattern formed by the first lamp body. The light distribution pattern of the sub-beam with an enlarged illumination area in the left and right direction without lowering the illuminance is obtained, and the visibility from the driver, especially in the central left and right direction, is improved, and the drivability at the time of lighting at night etc. is improved. It was done.

[Brief description of the drawings]

FIG. 1 is a front view showing a lighting state (at the time of forming a sub-beam) of an automotive headlamp according to an embodiment of the present invention.

FIG. 2 is a front view showing a lighting state of the head lamp (at the time of forming a main beam).

FIG. 3 is a horizontal sectional view of the headlamp.

FIG. 4 is a longitudinal sectional view of a first lamp body (second lamp body).

FIG. 5 is a front view of a reflector of the first lamp body.

FIG. 6 is a diagram showing a light distribution pattern of a sub-beam formed by a reflector of the first lamp body.

FIG. 7 is a diagram showing a light distribution pattern of a main beam formed by a reflector of the first lamp body.

FIG. 8 is a front view of a reflector of the second lamp body.

9 is a horizontal sectional view of a reflector of the second lamp body (a sectional view along line IX-IX in FIG. 8)

FIG. 10 is a diagram showing a light distribution pattern of a sub-beam formed by a second lamp body.

FIG. 11 is a diagram showing a light distribution pattern of a main beam formed by a second lamp body.

FIG. 12 is a schematic view showing a state where a sub-beam is formed by first and second lamp bodies.

FIG. 13 is a schematic view showing a state in which a main beam is formed by first and second lamp bodies.

FIG. 14 is a schematic view showing a headlamp for an automobile according to another embodiment of the present invention, showing a state where a sub-beam is formed by first and second lamp bodies.

FIG. 15 is a front view of a conventional headlamp when a sub-beam is turned on.

FIG. 16 is a front view of a conventional headlamp when a main beam is turned on.

FIG. 17 is a diagram showing a light distribution pattern of a sub-beam of a conventional headlamp.

FIG. 18 is a diagram showing a light distribution pattern of a main beam of a conventional headlamp.

[Explanation of symbols]

10A First lamp body (lamp body on the outside in the vehicle width direction) 10B Second lamp body (lamp body on the inside in the vehicle width direction) 15 Bulb insertion hole 16 bulb 17s Filament for sub beam 17m Filament for main beam 17d Shade 18A, 18B reflector 21 axis sloped reflective reflective surface area of the paraboloid in a sector L bulb insertion axis L _21, L ₂₂ fan axis paraboloidal reflecting surface of the

Claims (1)

(57) [Claims] 1. Two lamp bodies having a structure in which a double filament type bulb containing two filaments for a main beam and a sub beam and a shade for forming a sub beam are mounted on the front surface of a parabolic reflector are adjacent to each other. The main beam filament in each lamp body is reflected by the entire reflector to form a main beam, and among the sub beam filament lights in each lamp body, light that is not shaded by the shade is reflected by the reflector to form a sub beam. On the left and right sides of the reflector of one of the lamp bodies sandwiching the bulb insertion hole, there is formed a reflection paraboloid whose axis is inclined inward in the left-right direction with respect to the bulb insertion axis. An automotive headlamp characterized by being formed.