JPH0826022A - Head lamp lighting circuit - Google Patents

Abstract

PURPOSE:To provide a lighting circuit by which a head lamp is continuously lighted even if the fuse for the head lamp is cut off, so as to improve visibility. CONSTITUTION:A left side fuse 2L and a right side fuse 2R are arranged in parallel, connected to the respective one ends of common connections of filaments for low beam 4LL, 4LR and filaments for high beam 4HL, 4HR of a left side head lamp 3L and a right side head lamp 3R, the other ends of the filaments for low beam 4LL, 4LR are connected to a low beam switch through common connection, and the other ends of the filaments for high beam 4HL, 4HR are connected to a high beam switch through common connection.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a headlamp lighting circuit, and more particularly to a lighting circuit for lighting a headlamp even when a fuse of the headlamp is partially cut.

[0002]

2. Description of the Related Art FIG. 2 shows a conventional example of a headlamp lighting circuit for a bus. The battery 1 is connected to the high head lamp relay 2H and the low head lamp relay 2L, and each a contact and the left fuse 2HL, the right fuse 2HR, the left fuse 2LL, and the right fuse 2L.
Via R, the high beam filaments 4HL and 4HR and the low beam filaments 4LL and 4LR of the left head lamp 3L and the right head lamp 3R are connected.
The connection points between the high beam filaments 4HR and 4HL and the low beam filaments 4LR and 4LL are grounded.

On the other hand, the exciting coils of the high head lamp relay 2H and the low head lamp relay 2L are connected to the HU terminal and the HL terminal of the dimmer / passing switch 5, respectively.
The lighting switch 6 is connected from the HR terminal to the ground terminal E from the HR terminal.

In such a structure, the low head lamp relay 2 is turned on by turning on the switch II of the lighting switch 6 and turning on the low beam switch Lo of the dimmer switch 5.
When L is excited, the low beam filaments 4LL and 4LR of the left head lamp 3L and the right head lamp 3R are energized and turned on via the fuses 2LL and 2LR. Also, the high beam switch H of the dimmer switch 5
When i is turned on, the high headlamp relay 2H is excited and the high beam filament 4 of the left headlamp 3L and the right headlamp 3R is passed through the fuses 2HL and 2HR.
HL and 4HR will be energized and turned on.

[0005]

In the headlamp lighting circuit shown in FIG. 2 described above, four fuses 2LL, 2 are provided.
If any of HL, 2LR, 2HR is cut off,
Corresponding filaments 4LL, 4HL, 4LR,
The 4HR is turned off. Therefore, when the fuse on the left side or the right side is blown, only the left side or the right side as a headlamp is provided although there is a clearance lamp, and there is a problem that the other party has poor visibility.

The present invention provides a headlamp lighting circuit in which the headlamps on both the left and right sides are still turned on even when the fuse of the headlamp is blown to improve the visibility.

[0007]

Means for Solving the Problems The present invention which achieves the above-mentioned object, comprises: (1) a left-side fuse and a right-side fuse which are connected in parallel with each other and have one end connected to a battery;
Between the left head lamp and the right head lamp, which are respectively connected to the other ends of the left fuse and the right fuse and have a high beam filament and a low beam filament, respectively, and between the left head lamp and the right head lamp and the ground. A high beam switch and a low beam switch connected to each other, and connecting one end of the high beam filament and the low beam filament of the left headlamp and the right headlamp respectively to the other end of the corresponding left fuse and right fuse Then, the other ends of the high beam filaments of the left head lamp and the right head lamp are connected to each other and connected to the high beam switch, and the low beams of the left head lamp and the right head lamp are respectively connected. Connect the filaments connected to the low beam switch, characterized in that, also,
(2) Lighting of the left and right headlamps
A single headlamp relay that switches the connection between the left fuse and the right fuse and the battery in conjunction with the operation of the lighting switch that switches off the light is arranged between one end of the left fuse and the right fuse and the battery. Is characterized by.

[0008]

[Function] The left fuse is connected to the low beam and high beam filament connecting lines of the left headlamp, the right fuse is connected to the low beam and high beam filament connecting lines of the right headlamp, and the other left beam and the right beam of low beam are connected. Connect filaments to each other Connect high beam filaments to each other,
Moreover, by connecting to the low beam switch and high beam switch respectively, even if one fuse is blown, the current will flow from the other fuse and the remaining filaments will be lit, and all the left and right filaments will be lit. .

[0009]

EXAMPLE An example of the present invention will now be described with reference to FIG. In FIG. 1, a battery 1 is commonly connected to one ends of two left fuses 2L and two right fuses 2R via a contact of a single headlamp relay 2, and the other end of the left fuse 2L has a left headlamp 3L. Of the low beam filament 4LL and the high beam filament 4HL are connected to each other, and the other end of the right fuse 2R is connected to one end of the low beam filament 4LR and the high beam filament 4HR of the right headlamp 3R. Connected to. The low beam filaments 4LL and 4LR of the left head lamp 3L and the right head lamp 3R are commonly connected to the HL terminal of the dimmer / passing switch 5 and the high beam filaments 4HL and 4LR.
The HRs are also commonly connected and connected to the HU terminal of the dimmer / passing switch 5.

On the other hand, the excitation coil of the headlamp relay 2 is connected to the HR terminal of the lighting switch 6. Then, by turning on the switch II of the lighting switch 6 and the switches Hi and Lo of the dimmer switch, the lighting switch 6 is grounded.

In such a configuration, when the switch II of the lighting switch 6 is turned on, the head lamp relay 2a is turned on.
When the contacts are connected and, for example, the switch Lo of the dimmer switch 5 is turned on, the low beam filaments 4LL, 4 of the left head lamp 3L and the right head lamp 3R.
The LR is energized and lights up. When the switch Hi of the dimmer switch 5 is turned on, the high beam filaments 4HL, 4 of the left head lamp 3L and the right head lamp 3R are turned on.
The HR is energized and lights up.

Next, for example, when the left fuse 2L is cut, when the switch Lo is turned on by the dimmer switch 5, the low beam filament 4LR of the right headlamp 3R is turned on via the right fuse 2R, and Further, the high beam filament 4HR of the right headlamp 3R, the high beam filament 4HL of the left headlamp 3L, the low beam filament 4LL.
A current circulates to the HL terminal of the dimmer switch 5 via, and all of these filaments are lit. This is the same when the right fuse 2R is cut off, and also when the switch Hi is turned on by the dimmer switch 5.

[0013]

As described above, according to the present invention, even if one of the fuses is blown, the headlamps on both sides are turned on, so that the headlamps on only the left side or the right side of the vehicle are turned on. The visibility is prevented from being deteriorated.

[Brief description of drawings]

FIG. 1 is a lighting circuit diagram of an embodiment of the present invention.

FIG. 2 is a lighting circuit diagram of a conventional example.

[Explanation of symbols]

 1 Battery 2 Headlamp relay 2L Left fuse 2R Right fuse 3L Left headlamp 3R Right headlamp 4LL, 4LR Low beam filament 4HL, 4HR High beam filament 5 Dimmer / passing switch 6 Lighting switch

Claims (2)

[Claims] 1. A left-side fuse and a right-side fuse that are connected in parallel to each other and have one end connected to a battery, and a high-beam filament and a low-beam filament that are connected to the other ends of the left-side fuse and the right-side fuse, respectively. And a left headlamp and a right headlamp, respectively, and a high beam switch and a low beam switch connected between the left headlamp and the right headlamp and the ground, and the left headlamp and the right headlamp respectively. Connect one end of the high beam filament and one end of the low beam filament to the other end of the corresponding left fuse and right fuse, and connect the other ends of the high beam filaments of the left head lamp and the right head lamp respectively. hand A headlamp lighting circuit, which is connected to the high beam switch and also connects the low beam filaments of the left head lamp and the right head lamp to the low beam switch. 2. A single headlamp relay for switching connection between a left fuse and a right fuse and a battery in conjunction with operation of a lighting switch for switching on / off of the left headlamp and the right headlamp. The headlamp lighting circuit according to claim 1, wherein the headlamp lighting circuit is arranged between one end of the fuse and the right fuse and the battery.