JPS6040346Y2 - Headlamp disconnection warning device - Google Patents

Description

[Detailed description of the invention] This invention relates to a headlamp disconnection warning device.
A single buzzer is used to warn of headlamp disconnection and turn signal activation.

BACKGROUND ART When a headlamp of a vehicle such as an automobile breaks down while driving at night, it is desirable for the driver to know this as soon as possible for safety reasons.

However, if the road is bright, such as when driving in a city, the driver may continue driving without noticing, causing inconvenience when going to a dark place, and also being unfavorable from a safety standpoint.

Therefore, it is conceivable to provide a disconnection warning device to notify the driver when the headlamp is disconnected.

However, if this disconnection warning device is installed completely independently of the vehicle's other electrical circuits, the number of parts will increase, so it may not be possible to install it, especially in vehicles with limited space, and even if it is installed, it will be heavy. There are also other problems that lead to increased costs.

The present invention has been made in view of this point.

An embodiment of the present invention will be explained with reference to the drawings. 1 is a battery as a power source, and the negative electrode side is grounded (vehicle body grounded).

The same applies hereinafter), and the positive electrode side is connected to one pole of the main switch 2.

The other pole of the main switch 2 is connected to a movable contact 8 of a dimmer switch 7 via a lighting switch 3 and a coil 6 of a relay 5 of a disconnection detection circuit 4.

Between the two fixed contacts 9.10 of the dimmer switch 7 and the ground are the two filaments 12.13 of the headlamp 11.
is connected.

Although the relay 5 is made up of a coil 6 and a reed switch 14 and is designed to be compact, it goes without saying that it may have another structure.

One pole of this reed switch 14 is connected via a resistor 15.
It is connected to the connection point between the lighting switch 3 and the coil 6 of the relay 5, and the other pole is grounded.

Two resistors 16 and 17 are connected in series between the connection point between the resistor 15 and the reed switch 14 and the ground.
The base of the transistor 18 is connected to the connection point of the resistors 16 and 17.

The collector of the transistor 18 is connected to the output terminal 19 of the disconnection detection circuit 4, and the emitter is grounded.

The main switch 2 also has a turn signal relay 2.
One pole of 0 is connected.

The other pole of the turn signal relay 20 is connected to a movable contact 22 of a turn signal switch 21.

A turn signal lamp 25 at the front and rear of the vehicle is connected between one fixed contact 23 (left side) of the turn signal switch 21 and the ground.
．． 26 is connected, and the other fixed contact 24 (right side)
Similarly, between the ground and the turn signal lamp 27.28
is connected.

Further, a pilot lamp 29 is connected between the fixed contacts 23 and 24.

Turn signal relay 20 and turn signal switch 2
1, and turn signal lamp 25°26.27,2
8 forms a turn signal circuit.

Turn signal relay 20 in this turn signal circuit
A series circuit of a buzzer 30 and a diode 31 whose forward direction is the direction from the buzzer 30 toward the turn signal switch 21 side is connected in parallel with.

32 is a diode for absorbing back electromotive force.

The output end of the disconnection detection circuit 4 described above is connected to the connection point between the buzzer 30 and the diode 31.

This device constructed in this way operates as follows.

That is, when the main switch 2 is closed and the lighting switch 3 is closed, the current from the battery 1 passes through the coil 6 of the relay 5 of the disconnection detection circuit 4 and the dimmer switch 7, and is applied to either headlamp 11. It flows into a filament (filament 12 in the illustrated state).

Since the relay 5 closes the reed switch 14 by allowing current to flow through the coil 6, the base voltage of the transistor 18 becomes the ground voltage, and the transistor 18 maintains an off state.

2, no output signal is generated at the output end 19, so when the movable contact 22 of the turn signal switch 21 is closed to either fixed contact 23 or 24, the buzzer 30 sounds (the turn signal relay 20 synchronized with intermittent action)
It will have no impact on

If the filament 12, 13 on the side in contact with the movable contact 8 of the dimmer switch 7 is disconnected, the current to the coil 6 of the relay 5 is cut off, so the reed switch 14 remains open, and therefore the transistor A voltage determined by resistors 15, 16, 17 will be applied to the pace of 18.

As a result, the transistor 18 is turned on, and the output terminal 19 of the disconnection detection circuit 4 becomes the ground voltage.

When the output terminal 19 of the disconnection detection circuit 4 becomes the ground voltage, a current from the battery 1 flows through the buzzer 30, so that a continuous beep is performed and the driver is informed that the filaments 12 and 13 of the headlamp 11 are disconnected. You will be warned of what you have done.

This warning will be issued regardless of the turn signal circuit.

In the above circuit, the pilot lamp 29 may be omitted.

Since the present invention is configured as described above, a single buzzer can issue a headlamp disconnection warning and a turn signal activation warning, making it suitable for vehicles with limited space for installing a disconnection warning device. It also has advantages in terms of weight and cost.

[Brief explanation of the drawing]

The figure is a circuit diagram of an embodiment of the present invention. 1...Battery, 2...Main switch, 3...Lighting switch, 4...
...Disconnection detection circuit, 5...Relay, 6...
... Coil, 7 ... Dimmer switch, 11
...Headlamp, 14...Reed switch, 18...Transistor, 19...
...Output end, 20...Turn signal relay
21... Turn signal switch, 25, 26
,27゜28...Turn signal lamp, 30
...Buzzer 31...Diode.

Claims (1)

[Scope of utility model registration request] A disconnection detection circuit is connected to the connection circuit between the lighting switch and the headlamp, and in addition to this, a disconnection detection circuit is connected in parallel to the turn signal relay of the turn signal circuit, and the direction from the buzzer side to the turn signal switch side is the forward direction. A disconnection warning device for a headlamp, characterized in that a series circuit of diodes is connected, and an output end of the disconnection detection circuit is connected to a connection point between the buzzer and the diode.