JPH0249604Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a vehicular headlamp, and more particularly to a vehicular headlamp with improved low-beam light distribution characteristics.

General vehicle headlamps come in two-lamp or four-lamp types, but the driving beam has its light distribution characteristics so as not to dazzle the driver of an oncoming vehicle when passing by. It is configured to emit a passing beam with a different angle.

Hereinafter, a conventional two-lamp type vehicle headlamp will be described with reference to FIGS. 7 to 11.

In the figure, reference numeral 1 denotes a reflector, and this reflector 1 has a paraboloid-shaped reflective surface 10 on its front surface and a through hole 11 in the center. A lens (not shown) is provided in front of the reflector 1. 12 is a lamp chamber defined by the reflector 1 and the lens.

2 is an H4 type bulb, and this bulb 2 includes a glass bulb 20, a running filament 21 enclosed in the glass bulb 20, a passing filament 22, an inner shade 23, and the glass bulb 20. It consists of a base 24 fixed to the base end of the base, and a terminal 25 protruding rearward from the base 24. Insert the glass bulb 20 of the bulb 2 thus formed into the lamp chamber 12 through the through hole 11 of the reflector 1,
The cap 24 of the bulb 2 is connected to the through hole 1 of the reflector 1.
Attach removably to 1. As a result, the front end of the running filament 21 is located at the focal point F of the paraboloid of revolution reflection surface 10, the passing filament 22 is located forward and slightly above the running filament 21, and the inner shade 23 is It is located below the passing filament 22.

In the figure, X-X is the axis of the paraboloid of revolution reflective surface 10 and the optical axis. X' is a reference line parallel to its optical axis X--X. V-V
is the vertical axis in the light distribution pattern diagram, and HH is the horizontal axis in the light distribution pattern diagram.

Next, the operation of the above-mentioned vehicle headlight will be explained.

First, when the running filament 21 is turned on,
The light (traveling beam) emitted from the traveling filament 21 is reflected at the reflecting surface 10, and the parallel reflected light L parallel to the optical axis XX and the reflecting surface 10
Upward reflected light LU reflected in the upper half,
Alternatively, the downward reflected light LD reflected at the lower half of the reflective surface 10 is irradiated forward through the lens in a predetermined light distribution pattern as shown in FIG.

Furthermore, when the passing filament 22 is turned on, the light emitted from the passing filament 22 (passing beam) directed toward the upper half of the internal reflective surface 10 is reflected at the upper half of the reflective surface 10, and is reflected downward. Becomes LD. On the other hand, the reflective surface 10
The light LC directed toward the lower half of is blocked by the inner shade 23, as shown by the broken line in FIG.
As a result, the above-mentioned downward reflected light LD is irradiated forward through the lens in a predetermined light distribution pattern that does not dazzle the other party, as shown in FIG.

Conventional vehicle headlamps are either the two-lamp type mentioned above or the four-lamp type.
The light distribution pattern for passing each other is as shown in FIG.

As is clear from the light distribution pattern for passing each other in Fig. 10, the conventional passing beam illuminates the area in front of the vehicle as brightly as possible by directing the highest luminous intensity part from the optical axis X-X toward the lower left in the direction of travel of the vehicle. On the other hand, it is designed to avoid dazzling the drivers of oncoming vehicles. For this reason, the area above the horizontal axis H-H is hardly irradiated with light,
This region is dark from the driver's perspective, and objects in this region cannot be clearly seen. However, since overhead signs 3 are usually installed in such areas, it becomes difficult to confirm the overhead signs 3, which poses a problem in terms of safe traffic.

Therefore, in the past, for overhead sign confirmation 3, the headlights were temporarily turned into a running beam (the running beam was approximately aligned with the optical axis
-X has the highest luminous intensity, and the area above the horizontal axis H-H can also be illuminated. ), but this is not desirable as it may dazzle the drivers of oncoming vehicles passing by at this time.

Therefore, by irradiating a portion of the light from the passing beam to the overhead area above the horizontal axis H-H, excluding areas that would dazzle oncoming drivers or pedestrians, it is possible to confirm overhead signs. Vehicle headlights that can ensure traffic safety by enabling
-52482) was proposed earlier.

Such a vehicle headlight includes a reflector, a lens, and
A light source for a passing beam is provided, the reflecting mirror is a paraboloid of revolution, the light source is arranged near the focal point of the reflecting mirror, and at least one of a shade and a lens cut covering the light source is used to generate a passing beam. The irradiation area above the headlight optical axis and the horizontal axis is placed on the water surface perpendicular to the headlight optical axis.
The angle range is 35 degrees or more above the horizontal axis on the opposite lane side of the vehicle's direction of travel, and 38 degrees or more above the horizontal axis on the own lane side. As a result,
Part of the light of the passing beam (upward light)
, more than 35° above the horizontal axis on the oncoming lane side,
On the own lane side, it can constantly illuminate an angle range of 38 degrees or more above the horizontal axis, making it possible to check overhead signs.

[Problem that the invention attempts to solve]

However, in the above-mentioned vehicle headlights, a part of the upward beam of the passing beam is always illuminated in the above-mentioned angular range, so there are problems such as light curtain phenomenon caused by glare during foggy conditions. be.

An object of the present invention is to provide a vehicle headlamp that can irradiate a portion of the passing beam onto an overhead sign only when necessary, thereby preventing the occurrence of a light curtain phenomenon such as in foggy conditions.

[Means to solve the problem]

The present invention includes a reflector, a lens disposed in front of the reflector, and a bulb disposed within a lamp chamber defined by the lens and reflector, and the bulb includes a passing filament and an inner shade. A vehicle headlamp is provided with a through hole in the inner shade, and an outer shade is provided outside the bulb to block light passing through the hole in the inner shade, The outer shade is attached to the reflector so as to be retractable, the outer shade is linked with a drive device for making the outer shade move in and out, and a control switch for the drive device is disposed in the driver's cab.

[Effect]

The present invention advances the outer shade and blocks the light that passes through the through hole of the inner shade among the light from the passing filament.
Can block upward passing beams,
It can prevent the light curtain phenomenon. In addition, by retracting the outer shade and reflecting the light from the passing filament that passes through the hole in the inner shade toward the front lens on the reflective surface, a portion of the passing beam can be reflected to the overhead sign. can be irradiated.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a vehicle headlamp according to the present invention will be described below with reference to FIGS. 1 to 6.

In the figure, the same reference numerals as in FIGS. 7 to 11 indicate the same parts.

In the figure, 26 is a through hole opened in the inner shade 23 of the bulb 2, and this through hole 26 is located in the rear half (reflector 1 side) of the inner shade 23, as shown in FIGS. It was opened in an almost fan-shape on the left side when viewed from the bottom. As a result, among the light emitted from the passing filament 22 (passing beam), the light that passes through the through hole 26 of the inner shade 23 is directed toward the center of the lower half of the reflective surface 10 and toward the lens side. The light is reflected at a location on the left side, and passes through a lens to illuminate an overhead area Z as shown in FIG.

Reference numeral 4 denotes an outer shade. The outer shade 4 is composed of a shade part 40 and a rack part 41, and is attached so as to be retractable into a through hole 13 provided at the bottom of the approximately center of the reflector 1. It moves forward and backward downward, and when it is located at the forward position A shown in FIG. 2, it blocks the light that passes through the through hole 26 of the inner shade 23 among the passing beams, and returns to the backward position B shown in FIG. When positioned, the inner shade 23 of the passing beam
The light passing through the through hole 26 is made incident on the reflective surface 10.

Reference numeral 5 denotes a drive device for moving the outer shade 4 in and out (forward and backward), and this drive device 5 has a guide hole 51 in the housing 50,
(i.e., in the extending direction of the rack portion 41 of the outer shade 4), the motor 52 is built in the housing 50, and the gear 53
is rotatably supported. A worm 54 is fixed to the rotating shaft of the motor 52 described above, a gear 53 is meshed with the worm 54, and a rack portion 41 of the outer shade 4 is meshed with the gear 53. As a result, by rotating or reversing the rotation shaft of the motor 52, the outer shade 4 can be made to appear and disappear.

6 is a control switch, and this control switch 6 is a lamp switch 6 that operates the high beam, low beam, OFF, etc. of the headlights.
The lamp switch 60 and the shade switch 61 are arranged in the driver's cab. The above-mentioned lamp switch 60 is connected to a low beam lighting device 62 and a high beam lighting device 63, respectively, and the low beam lighting device 62 is connected to the terminal on the side of the passing filament 22 of the bulb 2, while the high beam lighting device 63 is connected to the terminal on the side of the passing filament 22 of the bulb 2. are connected to the terminals on the filament 21 side and the motor 52 of the drive device 5, respectively. The shade switch 61 described above is connected to the motor 52 of the drive device 5.
Connect to. In addition, the lamp switch 60 and shade switch 61 are connected to the battery 64, respectively.

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.

First, when the lamp switch 60 is operated to turn on the running filament 21, the outer shade 4 retreats to position B as shown in FIG. 1, and the light (running beam) is emitted from the running filament 21. is reflected on the reflective surface 10, and the optical axis
-X, and the upward reflected light LU reflected on the upper half of the reflective surface 10, or the downward reflected light LD reflected on the lower half of the reflective surface 10, forward through the lens, as shown in FIG. It is irradiated with a predetermined light distribution pattern as shown in FIG.

Furthermore, when the shade switch 61 is operated to advance the outer shade 4 to position A, and the lamp switch 60 is operated to light up the passing filament 22, light is emitted from the passing filament 22, as shown in FIG. The light (passing beam) directed toward the upper half of the inner reflective surface 10 is reflected at the upper half of the reflective surface 10 and becomes downward reflected light LD. On the other hand, a portion of the light directed toward the lower half of the reflective surface 10 is blocked by the inner shade 23, and the light LC passing through the through hole 26 of the inner shade 23 is reflected by the shade of the outer shade 4 as shown by the broken line. 40. As a result, the above-mentioned downward reflected light LD is irradiated forward through the lens in a predetermined light distribution pattern that does not dazzle the other party, as shown in FIG.

When recognizing the overhead sign 3, operate the shade switch 61 to move the outer shade 4 back to position B, as shown in FIG.
Of the light directed toward the lower half of the reflective surface 10, the light that passes through the through hole 26 of the inner shade 23 is reflected at the reflective surface 10, passes through the lens as upward reflected light LU, and travels forward to the Z range in FIG. irradiate. As a result, overhead signs can be recognized, while not dazzling oncoming and preceding vehicles. Moreover, since a part of the passing beam is irradiated to the Z range in Figure 4 only when necessary, the light curtain phenomenon of conventional vehicle headlamps, which always irradiate a part of the passing beam to the above-mentioned range, can be avoided. This can be prevented from occurring.

In the above embodiment, a two-lamp headlight using H4 type bulb 2 was explained, but the present invention can also be applied to a headlamp using other bulbs or a four-lamp headlamp. can be applied.

Further, in the above-described embodiment, when the lamp switch 60 is operated, the traveling filament 21 lights up.
Although the high beam lighting device 63 and the drive device 5 are linked together so that the outer shade 4 is moved backward, they may be operated individually.

[Effect of idea]

As is clear from the above, the vehicle headlamp of the present invention has a through hole in the inner shade in the bulb, and the outer shade is arranged outside the bulb so that it can appear and retract, so that it is possible to irradiate a beam for passing each other. When the outer shade is moved backward, the light of the passing beam that passes through the hole in the inner shade is reflected by the reflective surface of the reflector, passes through the lens, and is irradiated to a predetermined range in front. As a result, overhead signs can be recognized without dazzling oncoming or preceding vehicles. Moreover, it is possible to prevent the occurrence of the light curtain phenomenon of conventional vehicle headlamps that always irradiate a part of the passing beam onto the overhead area.

[Brief explanation of the drawing]

1 to 6 show an embodiment of the vehicle headlamp according to the present invention, FIG. 1 is a cross-sectional view showing the driving beam irradiation state, and FIG. 2 shows the passing beam irradiation state. Figure 3 is a cross-sectional view showing the overhead area irradiated state, Figure 4 is a light distribution pattern diagram showing the overhead area irradiated state, and Figures 5A and B are
The side view, bottom view, and Figure 6 of the H4 type valve are the electrical circuit diagrams of the controls. Figure 7 is a cross-sectional view showing the driving beam irradiation state of a conventional vehicle headlamp, Figure 8 is a light distribution pattern diagram showing the driving beam irradiation state, and Figure 9 is a conventional vehicle headlamp. Cross-sectional view showing the beam irradiation state for passing lights,
FIG. 10 is a light distribution pattern diagram showing the irradiation state of the passing beam, and FIGS. 11A and 11B are a side view and a bottom view of an H4 type bulb used in a conventional vehicle headlamp. 1... Reflector, 10... Reflective surface, 12...
Light chamber, 2... Bulb, 20... Glass tube bulb, 2
1... Filament for running, 22... Filament for passing, 23... Inner shade, 26
...Through hole, 3...Overhead sign, 4...Outer shade, 5...Drive device, 6...Control switch.

Claims (1)

[Scope of utility model registration request] The lamp includes a reflector, a lens disposed in front of the reflector, and a bulb disposed within a lamp chamber defined by the lens and the reflector, and a passing filament and an inner shade are disposed in the bulb. In the vehicle headlamp, a through hole is provided in the inner shade, an outer shade is provided outside the bulb to block light passing through the hole in the inner shade, and the outer shade is A vehicle headlamp, characterized in that the reflector is attached to the reflector so as to be retractable, the outer shade is linked with a drive device for making the outer shade appear and retract, and a control switch for the drive device is arranged in a driver's cabin.