JPH0227446Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a vehicle headlight of a type in which a driving filament and a passing filament are simultaneously built into the lighting lamp.

Prior Art A switchable headlight equipped with a running filament and a passing filament has a running filament and a passing filament built into the lighting lamp, and a reflector having a parabolic surface of rotation behind the lighting lamp. is considered to be the basic configuration.

Conventionally, there are some types in which the longitudinal direction of the filament is parallel to the axis of rotation of the parabolic rotation surface of the reflector, and others in which the longitudinal direction of the filament is in the horizontal and vertical direction.In the latter case, the reflected light spreads laterally and the amount of light that illuminates the front is There is a downside of decreasing.

There are also various ways of arranging the filaments, but the filament for normal running is placed at the focal point of the rear reflector so that the reflected light turns into a horizontal beam that illuminates a far distance, and the filament for passing is placed at a position in front of the focal point. At the same time, a light shielding plate is provided on the lower side of the passing filament so that light is emitted only upward, and the light reflected by the upper half of the reflector illuminates the diagonally forward direction of the vehicle.

However, when the passing filament is turned on, the amount of light is reduced by the light blocking plate, and it may feel darker when switching from the running beam to the passing beam.

On the other hand, especially when driving in a city, a passing filament is mainly used rather than a driving filament, and in reality, bright illumination light is required due to the passing beam, which is frequently used.

Furthermore, when the driving filament is turned on, it may illuminate only a distant area, leaving the road diagonally in front of the vehicle dark.

In view of these circumstances, an example of an invention (Utility Model Application Publication No. 118201/1983) has been proposed in which the amount of light of the passing beam is increased so that the traveling beam also illuminates diagonally in front of the vehicle.

In the same example, as shown in the vertical cross-sectional view in _FIG . It is located behind the focal point f ₂ of the half reflector 011.

A passing filament 013 with a length l slightly narrower than the distance between the two focal points f ₁ and f ₂ is arranged parallel to the parabolic rotation axis Z-Z of the reflector, and a traveling filament 012 is placed parallel to the parabolic rotation axis Z-Z below it. It is located in

The length L of the running filament 012 is longer than the length l of the passing filament, and the length L is longer than the length l of the passing filament.
l′, the position is such that it protrudes l″ rearward.

Therefore, if the passing filament 013 is turned on, the passing filament 013
is in front of the focal point f ₁ and behind the focal point f ₂ , so
As shown by the arrow in Fig. 5, the reflected light travels forward and diagonally downward and illuminates the road surface diagonally in front of the vehicle without using a light shielding plate or reducing the amount of light by the upper and lower reflectors 011. Can be done.

Furthermore, when the traveling filament 012 is turned on, not only a substantially horizontal irradiation light is produced, but also the passing filament 012 as shown in FIG.
The emitted light from the part that protrudes forward by l' from the filament 13 is reflected by the reflector 011 in the upper half and travels downward, and the emitted light from the passing filament 013 and the part which protrudes backward by l'' is reflected by the reflector 011 in the upper half. Since the light is reflected by the reflector 011 and travels diagonally forward, when the traveling filament is turned on, it is possible to illuminate not only a distant place but also a diagonally forward direction of the vehicle.

Problems that the invention attempts to solve However, the focus is on filament 013 for passing each other.
Since the distance between f ₁ and f ₂ is the same as the distance between them, the emitted light at both ends near the focal point is reflected by the reflector 011 and becomes a substantially horizontal beam that illuminates a considerable distance. The amount of light illuminating the area diagonally in front of the vehicle was reduced, and it was not possible to sufficiently increase the amount of light of the passing beam.

Furthermore, since the running filament 012 is longer in the front and back than the passing filament 013, the portion that protrudes forward by l' from the passing filament 013 is located in front of the focal point _f2 .
The portion that protrudes backward by l″ will be located behind the focal point _f1 .

Therefore, as shown in FIG. 6, when the emitted light from the forwardly protruding portion is reflected by the lower half reflector 011, it travels upward and illuminates the upper part, and as described above, it is reflected by the upper half reflector 011. The light travels downward and is reflected, but its angle is large and it illuminates the road surface that is quite close to the vehicle.

Furthermore, when the light emitted from the rearwardly projecting portion is reflected by the reflector 011 in the lower half, it travels downward, but at a large angle, and the light reflected by the reflector 011 in the upper half travels upward.

From the above, as shown in Figure 6, there is a lot of reflected light directed upwards, and reflected light directed downwards irradiates the road surface near the vehicle more than necessary, which is not the original purpose of the driving beam. The amount of light for a certain distance illumination is reduced accordingly.

By the way, although the support structure for the filament is not shown in this prior example, a conventional general support structure is shown in FIG. 7.

That is, the rear terminals of the passing filament 013 and the running filament 012 are supported by a common stem 02 protruding from the base 01, and the front terminal of the passing filament 013 is supported by the base 01.
A stem 03 that protrudes around the upper part is supported, and the terminal in front of the running filament 012 is supported by a stem 04 that protrudes around the lower part of the base 01.
is supported.

Therefore, since the stem 03 is located above the passing filament 013, a shadow (dark zone) due to the stem 03 is generated above when the passing filament 013 is lit.

Due to this dark zone, the reflector in the upper half is 0.
By reducing the amount of reflected light of No. 11, the amount of light of the passing beam is reduced as a whole.

Means and Effects for Solving the Problems The present invention has been devised in view of the above points, and its purpose is to create a structure that increases as much as possible the amount of light of the passing beam, which is actually frequently used, and to The present invention also provides a headlight that distributes the beam more effectively.

In other words, the present invention provides a vehicle headlight in which a traveling filament and a passing filament are arranged vertically and parallel to the parabolic rotation axis of the reflector, and the focus of the upper half of the reflector and the lower half located horizontally forward of the same focal point. A filament for passing is placed approximately in the center between the two focal points on the center line connecting the focus of the reflector, and a filament for traveling is placed below and in front of the filament for passing and further behind the focal point of the lower half of the reflector. , a headlight for a vehicle in which a stem that commonly supports the front portions of the passing filament and the running filament is provided below the running filament.

Since the passing filament is located approximately at the center between the front and rear focal points, most of the light reflected by the upper and lower reflectors is concentrated diagonally downward, allowing brighter illumination of the road surface.

Moreover, since there is no stem above the passing filament, a brighter passing beam is formed without reducing the amount of light reflected by the upper half reflector.

In addition, the traveling filament is located below and in front of the passing filament, and further behind the focal point of the lower half reflector, so that the upward irradiation light and the road surface irradiation light near the vehicle can be emitted over a wider range than necessary. It is possible to form an effective traveling beam that avoids the light distribution and achieves an effective light distribution and maintains the necessary road illumination.

EXAMPLE The present invention shown in FIGS. 1 to 4 will be described below.

1 and 2 are a longitudinal cross-sectional view of the headlight of this embodiment and a cross-sectional view taken along the line shown in FIG. 1.

1 lighting lamp, which has a filament 2 for passing each other and a filament 3 for running inside, and reflectors 4, 5 in the shape of parabolic surfaces of rotation up and down behind it.
Two are placed with a difference in the front and back.

The filaments 2 and 3 are of C-8 type and are arranged parallel to the parabolic rotation axis Z-Z of the reflectors 4 and 5.

The passing filament 2 has a parabolic rotation axis Z-
On Z, connect both front and rear terminals to stems 6 and 7, respectively.
The running filament 3 is located below and in front of the passing filament 2, and its front and rear terminals are supported by stems 6 and 8, respectively.

The stems 7 and 8 protrude forward from the front end of the cap 9, and fixedly support the rear terminals of the filaments 2 and 3 at their slightly lowered tips, and the stem 6 protrudes forward from the lower part of the front end of the cap 9 and travels slightly downward. The lower part of the running filament 3 is detoured parallel to the parabolic rotation axis Z-Z, and after passing the running filament 3, it is bent vertically upward and the front terminals of the passing filaments 2 and 3 are common to the vertical part. It is fixed and supported.

The upper and lower reflectors 4 and 5 have the same focal length, but since the upper half of the reflector 4 is shifted backward from the lower half of the reflector 5, the focus of the reflector 5 is in front of the focus F1 of the reflector ₄ .
F ₂ is located.

The illuminating lamp 1 is fixed so that the passing filament 2 is located between the two focal points _F1 and _F2 , and the traveling filament 3, which is located below the illuminating lamp 1 and diagonally forward, has its front end at the focal point. Behind _F2 , the rear end is in front of the rear end of the passing filament 2, and is in a positional relationship as shown in FIG.

FIGS. 3a and 3b show the light beam path and its spot light pattern when the passing filament 2 is turned on in the headlight having the above structure.

Since the passing filament 2 is located in front of the focal point _F1 , the light reflected by the upper half reflector 4 travels downward from the horizontal, and the pattern Al of the spot light is centered horizontally as shown by the solid line in Fig. 3b. It is formed in a semicircular shape below the axis H-H, and since the passing filament 2 is located behind the focal point _F2 , the light reflected by the lower half reflector 5 also travels downward from the horizontal, and its The spot light pattern Bl is a pattern as shown by the broken line.
It is formed in a semicircular shape slightly downward while mostly overlapping Al.

Therefore, as is clear from both the spot light patterns Al and Bl, a basic low beam for passing each other is formed without a light shielding plate, and the pattern
The amount of light increases due to the overlap of Al and Bl.

Moreover, since both ends of the passing filament 2 are not closer than necessary to the front and rear focal points F ₁ and F ₂ , nearly horizontal reflected light is not generated, and the light is effectively distributed diagonally in front of the vehicle, making it brighter. A passing beam can be formed.

Furthermore, since there is no stem near the upper part of the passing filament 2, and the stem 6 exists further below the traveling filament 3, there is no dark zone (shadow by the stem) above the passing filament 2, but it is formed below. Since the dark zone created by the stem 6 is narrow, there is almost no decrease in the amount of reflected light.

Next, the light beam path and its spot light pattern when the running filament 3 is turned on are shown in FIGS. 4a and 4b, respectively.

Since the rear end of the traveling filament 3 is located sufficiently forward of the focal point _F1 , the light reflected from the traveling filament 3 by the upper half reflector 4 is almost the same as when the above-mentioned passing filament 2 is turned on, and most of the light is horizontal. The spot light pattern Ah is formed in a semicircular shape below the central horizontal axis H-H, and the reflector 5 in the lower half
When the traveling filament 3 is at the focal point _F2 , the reflected light from the traveling filament 3 forms a substantially circular spot light pattern Bh overlapping the horizontal central axis H--H, which becomes a horizontal light beam in the same way as when the traveling filament 3 is at the focal point F2.

Although there is some reflected light that travels upward, the front end of the traveling filament 3 is located slightly behind the focal point _F2 , so the amount of light that travels upward is an appropriate amount, not more than necessary. .

Therefore, the reflected light that forms the spot light pattern Ah illuminates the road surface diagonally downward in front of the vehicle, and the reflected light that forms the spot light pattern Bh can effectively illuminate a distant area and illuminate the road surface above and near the vehicle more than necessary. This enables a more effective driving beam distribution without illuminating the road surface.

Moreover, since the irradiation light formed by the spot light pattern Ah by the upper half reflector is not reduced in light intensity by the stem, it is possible to more brightly illuminate the diagonal front of the vehicle.

As described above, the headlight according to this embodiment has a structure that increases the amount of light of the passing beam as much as possible, thereby realizing brighter illumination of the road surface.

The driving beam also eliminates unnecessary reflected light and provides effective light distribution.

In addition, when the passing filament 2 and the running filament 3 are turned on at the same time when passing, the patterns Al, Bl and Ah overlap, as is clear from the spot light patterns shown in FIGS. 3b and 4b. The light distribution of the passing beams can be made brighter, and an effective light amount distribution can be formed.

Effects of the Invention The present invention can increase the light intensity of the low beam due to its structure, making it possible to brighten the illumination of the road surface by the high frequency low beam.

Furthermore, when using the driving beam, bright illumination is achieved with effective light distribution, and the road surface diagonally in front of the vehicle is also illuminated.

[Brief explanation of the drawing]

Fig. 1 is a vertical cross-sectional view of a headlight according to an embodiment of the present invention, Fig. 2 is a cross-sectional view taken from Fig. 1, and Fig. 3 is a ray path and spot when the passing filament of the same embodiment is lit. Figure 4 is a diagram showing the light ray path and spot light pattern when the running filament of the same embodiment is turned on, Figure 5 is a longitudinal sectional view of the main part of the conventional headlight, Figure 6 is The figure shows a light beam path when the traveling filament is turned on in the conventional example, and FIG. 7 is a diagram showing a conventional filament support structure. 1...Lighting lamp, 2...Filament for passing each other, 3...Filament for traveling, 4, 5...Reflector, 6, 7, 8...Stem, 9...Base.

Claims (1)

[Scope of utility model registration request] In a vehicle headlight in which a traveling filament and a passing filament are arranged vertically parallel to the parabolic rotation axis of the reflector, the focal point of the upper half reflector and the focal point of the lower half reflector located horizontally ahead of the parfocal A filament for passing is placed approximately in the center between the two focal points on the center line connecting the two focal points, and a filament for traveling is placed below and in front of the filament for passing and further behind the focal point of the lower half of the reflector. A headlight for a vehicle, characterized in that a stem that commonly supports a filament and a front portion of the running filament is provided below the running filament.