JPH0135368Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a headlamp for a vehicle.
Specifically, it relates to a vehicle headlight that has a structure that can be switched between a driving beam that illuminates a long distance at night and a passing beam that illuminates an oncoming vehicle at night so as not to glare at the vehicle. It is.

(Prior Art) A conventional vehicle headlamp of this type will be described with reference to FIGS. 17 to 21.

In the figure, 1 is an H4 type bulb, and this bulb 1 has a main filament (filament for traveling beam) 11 and a sub-filament (filament for passing beam) 12 in a glass bulb 10 along the optical axis (bulb axis) Sub filament 12 parallel to X and behind main filament 11
are placed in front of each other, a light shielding body 13 is provided below the subfilament 12, and a light blocking film 14 such as paint is provided on the front end of the glass bulb 10 to cover the glass bulb 10. A cap 15 is equipped at the rear end of the ball 10. Reference numeral 2 denotes a reflector that reflects the light from the bulb 1 forward.The reflector 2 in this example is movable, and the base 15 of the bulb 1 is placed in the center of the reflector 2 so that it cannot be moved in the rotational direction or the front-rear direction. Position and equip. At this time, the main filament 11
is located slightly below the focal point of the reflecting surface in the shape of a paraboloid of revolution of the reflector 2, and the subfilament 12 is located forward of the focal point on the optical axis XX of the reflecting surface. Reference numeral 3 denotes a lens that refracts the reflected light from the reflector 2, and is attached to the front opening of the housing 4. A lamp chamber is defined by the lens 3 and the housing 4, and a bulb 1 is placed inside the lamp chamber.
and a reflector 2 are accommodated. To explain the operation of this vehicle headlight, when driving at night, the main filament 11 is turned on to irradiate the driving beam far away, and when passing an oncoming vehicle, the sub-filament 12 is turned on to provide a glare to the oncoming vehicle with the passing beam. Irradiate in such a way that it does not cause damage.

In such vehicle headlights, when passing an oncoming vehicle at night, it does not give glare to the oncoming vehicle;
In order to obtain forward visibility when the two vehicles pass each other, the light distribution pattern of the passing beams as shown in FIG. 21 has been standardized. The light distribution pattern shown in FIG. 21 is a light distribution pattern when cars drive on the left side, as in Japan (note that when cars drive on the right side, as in Europe, the left and right sides are reversed).
In the first quadrant above the horizontal center line H-H and to the right of the vertical center line V-V, the irradiation light is cut to prevent glare from oncoming vehicles, and the horizontal center line H In the second quadrant above -H and to the left of the vertical center line V-V, the irradiated light is cut so that it rises in a triangular shape by a cut line L, so that forward visibility is obtained when passing an oncoming vehicle. Furthermore, the horizontal center line H-
In the third quadrant to the left and the fourth quadrant to the right of the vertical center line V-V below H, illumination light is present for obtaining downward visibility. in this way,
The light distribution pattern of the passing beam that is standardized by cutting the irradiated light is called a cut pattern.

In order to obtain the above-mentioned cut pattern, a conventional vehicle headlamp has a substantially semicircular cross section, and its left shoulder 13L (left shoulder in the irradiation direction) is located along the horizontal center line passing through the center of the subfilament 12. A light shielding body 13 is disposed below the subfilament 12 on H-H, and the right shoulder 13R is located below the horizontal centerline H-H by a central angle of θ°. In such conventional vehicle headlights, the lens 3
The light distribution (basic light distribution) before being controlled by the reflector 2, that is, as it is reflected by the reflector 2, is as shown in FIG. In other words, there is no irradiation light in the first quadrant, and in the second quadrant there is a cut line L extending at an angle of θ° from the center with respect to the horizontal center line H-H.
There is irradiation light further down, and further in the third and fourth quadrants there is irradiation light that spreads in a fan shape over the third and fourth quadrants. The right shoulder of this basic light distribution (along the horizontal center line HH) is limited by the left shoulder 13L of the light shield 13, and is also indicated by the left shoulder of the basic light distribution (cut line L). ) is limited by the right shoulder 13R of the light shield 13. As a result, the conventional vehicle headlamp has the above-mentioned cut pattern.

(Problems to be solved by the invention) However, the above-mentioned conventional vehicle headlights
Since the light shielding body 13 is disposed below the subfilament 12, the basic light distribution shown in FIG. 20 can be obtained, and as a result, the cut pattern shown in FIG. 21 can be obtained. The light flux from the filament 12 is blocked by the light blocking body 13
As shown in the basic light distribution in Fig. 20, the area blocked by the subfilament 12 covers the 180° - θ° range of the reflecting surface of the reflector 2, which is a problem in that the luminous flux from the subfilament 12 is not fully utilized. There is.

SUMMARY OF THE INVENTION An object of the present invention is to provide a vehicular headlamp that can provide a cut pattern and that can fully utilize the luminous flux from the subfilament.

(Means for solving the problem) The present invention includes at least two light-shielding bands for forming a cut pattern provided on the bulb, and a light distribution pattern in the glare area and a light distribution pattern in the non-glare area. The invention is characterized by comprising means for transferring the transfer means to the transfer means, and a drive means for driving the transfer means.

(Function) According to the present invention, a cut pattern can be obtained using two or more light-shielding bands, and the light flux exposed between the two or more light-shielding bands can be utilized. Moreover,
The transfer means can transfer the light flux exposed between two or more light-shielding bands, that is, the light distribution pattern of the portion that causes glare to the light distribution pattern of the portion that does not cause glare.

(Examples) Hereinafter, four examples of the vehicle headlamp according to the present invention will be described with reference to FIGS. 1 to 16.

1 to 11 show a first embodiment of a vehicle headlamp according to the present invention.
The figure is a sectional view of the inner lens with the inner lens folded down while driving, Figure 3 is a perspective view of the bulb used in the vehicle headlight of the present invention, and Figure 4 is the same as in Figure 3.
Linear cross-sectional view, Figure 5 shows the basic light distribution with the inner lens folded down, Figure 6 shows the light distribution pattern with the inner lens folded down, and Figure 7 shows the light distribution pattern with the inner lens erected. FIG. 8 is a diagram showing the light distribution pattern with the inner lens in an upright state; FIG. 9 is a perspective view of the inner lens used in the vehicle headlamp of the present invention; FIG. 10 is a partial sectional view showing the driving means with the inner lens upright, and FIG. 11 is a partial sectional view showing the driving means with the inner lens tilted down.

In the figure, the same reference numerals as in FIGS. 17 to 21 indicate the same parts. In the figure, 1A is a bulb, which includes a glass bulb 10 and a main filament 1.
1, subfilament 12, light shielding film 14, base 1
5. Reference numerals 51 and 52 are two light-shielding bands for forming a cut pattern, and these two light-shielding bands 51 and 52 are made of a light-opaque paint or the like similar to the light-shielding film 14, and are made of the same light-impermeable paint as the light-shielding film 14. Ball 1
0 from the light shielding film 14 toward the base 15 in parallel to the optical axis XX and from the subfilament 12 to the base 15 side. The above-mentioned first light-shielding zone 51
has a width corresponding to a central angle θ ₁ °, its left shoulder 51L is located on the horizontal center line H-H, and its right shoulder 51R is located below the horizontal center line H-H by a central angle of θ ₁ °. .
On the other hand, the second light-shielding band 52 has a width corresponding to a central angle of θ ₂ °, its right shoulder 52R is located below the horizontal center line H-H by a central angle of θ ₀ °, and its left shoulder 52L is located at the horizontal center. It is located below the line HH by a central angle of θ ₂ ° + θ ₀ °. As a result, the right shoulder 51R of the first light shielding band 51
An opening 53 having a width of θ ₃ ° from the left shoulder 52L of the second light-shielding band 52 is formed. The basic light distribution of a vehicle headlamp equipped with this bulb 1A is as shown in FIG. That is, in the first and second quadrants, there is first irradiation light L1 that spreads in a fan shape with a central angle of θ ₃ °. In the second, third, and fourth quadrants, there are lines below the cut line L extending at an angle of θ ₀ ° from the center with respect to the horizontal center line H-H in the second quadrant, and in the third and fourth quadrants. There is second irradiation light L2 that spreads in a fan shape over the area. The first irradiation light L1 of this basic light distribution
The right shoulder of is defined by the right shoulder 51R of the first light-shielding band 51, and the left shoulder is limited by the left shoulder 52L of the second light-shielding band 52. Further, the right shoulder (along the horizontal center line H-H) of the second irradiation light L2 is limited by the left shoulder 51L of the first shading band 51, and the left shoulder (indicated by the cut line L) It is limited by the right shoulder 52R of the second light shielding band 52. As a result, a light distribution pattern as shown in FIG. 6 is obtained. That is, the pattern of glare light (indicated by the two-dot chain line) GP by the first irradiation light L1 and the second irradiation light L2
There is a cut pattern (indicated by a solid line) CP.

Reference numeral 6 denotes a transfer means rotatably attached between the lens 3 and the reflector 2 in the lamp chamber defined by the lens 3 and the housing 4, and is an inner lens in this example. This inner lens 6
The front surface 60 forms a diffusion prism, the back surface 61 forms a Fresnel prism, and a shaft 62 is integrally provided below both end surfaces. A shaft 62 of this inner lens 6 is rotatably supported on a bearing 40 provided within the housing 4. This inner lens 6 is
As shown in Fig. 2, when the person is lying down, the basic light distribution shown in Fig. 5 is obtained and the light distribution pattern shown in Fig. 6 is obtained. In this state, the basic light distribution shown in FIG. 7 is obtained. That is, the fifth
In the basic light distribution shown in the figure, the first irradiation light L1 and the second irradiation light L2, which are separated from each other, are
The irradiation light L1 is transferred into the second irradiation light L2 and the first
This means that the irradiation light L1 and the second irradiation light L2 are superimposed. As a result, the light distribution pattern shown in Fig. 8, that is, the light distribution pattern of the glare portion
Cut pattern CP for parts that do not cause glare on GP
The light distribution pattern is transferred inside.

Reference numeral 7 denotes a driving means for rotating the inner lens 6, which in this example is composed of a shape memory alloy member 70 and a spring 71. The above-mentioned shape memory alloy member 70 has an L-shaped shape as shown in FIG. ). Spring 7 mentioned above
1 has both ends engaged with the free end of the inner lens 6 and the lens 3, as shown in FIG.
The inner lens 6 is always biased in the direction of tilting it down.

The vehicle headlight of the present invention in this embodiment is as follows:
It has the above configuration, and its operation will be explained below.

When driving at night, the main filament 11 is turned on to irradiate a traveling beam far away. At this time, the inner lens 6 is tilted down by the spring force of the spring 71, as shown in FIG.
The reflected light from the reflector 2 is not affected by the above-mentioned inner lens 6, and therefore a desired light distribution pattern can be obtained.

When passing each other, the switch for the passing beam is turned on, the subfilament 12 is turned on, and the passing beam is emitted so as not to give glare to the oncoming vehicle. At this time, the shape memory alloy member 70 is heated with electricity, and as shown in FIG. For this reason, if there is no inner lens 6, the basic light distribution will be as shown in FIG. 5, and the light distribution pattern will be as shown in FIG. The basic light distribution becomes the light distribution pattern shown in FIG. 8, that is, a light distribution pattern in which the light distribution pattern GP of the glare portion is transferred to the cut pattern CP of the non-glare portion.
As a result, the luminous flux from the subfilament 12 can be fully utilized without causing glare to oncoming vehicles.
That is, the inner lens 6 allows the first irradiation light L1 to be transferred into the second irradiation light L2 as shown in FIG. 7, and as a result, a cut pattern CP as shown in FIG. 8 is obtained. On the other hand, the light beam exposed from the opening 53 between the first light-shielding band 51 and the second light-shielding band 52, that is, the first irradiation light L1, is
The light distribution pattern of the part that is transferred into the irradiation light L2 and becomes glare as shown in FIG.
Cut pattern CP where GP does not cause glare
The light flux of the subfilament 12 can be fully utilized.

12 to 14 show modified examples of the driving means, FIG. 12 is a partial perspective view showing the inner lens in an upright state, and FIG. 13 is a partial perspective view showing the inner lens in a fallen state. , FIG. 14 is an electrical circuit diagram.

In the figure, 41 is a cylindrical bearing, 42 is a bearing having a slit at the upper end, and this bearing 41,
42 rotatably supports a shaft 62 of the inner lens 6. 7A is a driving means, and the driving means 7A in this example includes a motor 70A and the motor 70A.
An arm 71A has one end attached to the rotation axis of the arm 71A, and a link 72 has one end pivoted to the other end of the arm 71A.
The other end of the link 72A is pivotally supported on the free end of the inner lens 6. In the electrical circuit diagram of FIG. 14, 70A is a motor, 73A is a low beam switch, 74A is a contact plate switch, 75A is a first relay, and 76A is a second relay.

Next, the operation of the above-mentioned driving means will be explained.

When you turn on the passing beam switch 73A,
the first through the contact plate switch 74A.
The relay 75A is turned on, the motor 70A is activated, and the inner lens 6 is put into use in an upright position as shown in FIG. As a result, the light distribution pattern shown in FIG. 8 is obtained. When the inner lens assumes a completely upright position, the contact plate switch 74A moves, the first relay 75A turns OFF, and the motor 70A stops. When the main filament 11 is turned on or the bulb 1A is turned off, no current flows from the low beam switch 73A, so the second relay 76A is turned on. and,
the first through the contact plate switch 74A.
The relay 75A is turned on, the motor 70A is activated, and the inner lens 6 assumes an inverted posture as shown in FIG.

FIG. 15 is a partial sectional view showing a modification of the transfer means.

In the figure, reference numeral 6A denotes a transfer means, and the transfer means 6A in this example is formed by dividing the lower side of the reflector 2, and is attached to the housing 4 via a drive means 7B so as to be movable up and down. This driving means 7B is similar to the driving means of the remote control mirror.

The operation of this embodiment will be explained. First, when traveling, when the transfer means 6A is oriented upward as shown by the solid line, it forms a reflective surface of the paraboloid of rotation of the reflector 2, so that the light flux from the main filament 11 is reflected in the direction shown by the solid line arrow, thereby achieving the desired traveling. The light distribution pattern at the time can be obtained. Furthermore, when the transfer means 6A is directed downward as shown by the broken line when passing each other, the light beam from the subfilament 12 is reflected in the direction shown by the broken line arrow, so that the light distribution pattern GP in the glare area is cut out in the non-glare area. The light distribution pattern shown in FIG. 8 is obtained by transferring the light to pattern CP.

FIG. 16 is a perspective view of a bulb showing a modification of the light-shielding band.

In the figure, reference numeral 8 denotes a light shielding body, which is made of a light-opaque thin plate and includes a cap 80 that covers the front surface of the glass bulb 10 of the bulb 1A, and a light shielding body 8 that directs light from the cap 80 toward the base 15. A first light shielding zone 81 and a second light shielding zone 82 are provided parallel to the axis XX and extend from the subfilament 12 to the base 15 side.
and a strong bridge 83 interposed between the cap 80 and the base 15. With these light shielding bands 81 and 82, a basic light distribution as shown in FIG. 5 is obtained.

(Effects of the invention) As is clear from the above, the vehicle headlamp of the present invention has two or more shading bands forming a cut pattern on the bulb. A pattern is obtained, and the light flux exposed between the two or more shading bands can be used. Moreover, since we have provided a means of transfer,
With this transfer means, it is possible to transfer the light beam exposed from between two or more light-shielding bands, that is, the light distribution pattern of the part that causes glare, to the light distribution pattern of the part that does not cause glare. Therefore, a cut pattern can be obtained, and the luminous flux of the subfilament can be fully utilized.

[Brief explanation of the drawing]

1 to 11 show a first embodiment of a vehicle headlamp according to the present invention.
The figure is a sectional view of the inner lens with the inner lens folded down while driving, Figure 3 is a perspective view of the bulb used in the vehicle headlight of the present invention, and Figure 4 is the same as in Figure 3.
Linear cross-sectional view, Figure 5 shows the basic light distribution with the inner lens folded down, Figure 6 shows the light distribution pattern with the inner lens folded down, and Figure 7 shows the light distribution pattern with the inner lens erected. FIG. 8 is a diagram showing the light distribution pattern with the inner lens in an upright state; FIG. 9 is a perspective view of the inner lens used in the vehicle headlamp of the present invention; FIG. 10 is a partial sectional view showing the driving means with the inner lens upright, and FIG. 11 is a partial sectional view showing the driving means with the inner lens tilted down. 12 to 14 show modified examples of the driving means, FIG. 12 is a partial perspective view showing the inner lens in an upright state, and FIG. 13 is a partial perspective view showing the inner lens in a fallen state. , FIG. 14 is an electrical circuit diagram. FIG. 15 is a partial sectional view showing a modification of the transfer means. FIG. 16 is a perspective view of a bulb showing a modification of the light-shielding band. Figures 17 to 21 show conventional vehicle headlamps.
The figure is a vertical sectional view, Figure 18 is a perspective view of the valve, and Figure 18 is a perspective view of the valve.
Figure 9 is a sectional view taken along line A--I in Figure 18, and Figure 20
The figure shows the basic light distribution, and FIG. 21 shows the light distribution pattern. 1A...Bulb, 11...Main filament, 12...Subfilament, 2...Reflector, 3...Lens, 4...Housing, 51,
52, 81, 82...Shading band, 6... Inner lens (transfer means), 6A... Transfer means, 7, 7A,
7B...Driving means.

Claims (1)

[Scope of utility model registration request] A vehicle headlamp comprising a bulb in which a main filament and a sub-filament are arranged, a reflector that reflects light from the bulb forward, and a lens that refracts the reflected light from the reflector, wherein the bulb is provided with: At least two light-shielding bands for forming a cut pattern, a means for transferring a light distribution pattern in a glare portion to a light distribution pattern in a non-glare portion, and a driving means for driving the transfer means. A vehicle headlight characterized by: