JPS6222436Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a lighting equipment disconnection detection device that detects the disconnection of multiple lighting equipment such as vehicle stop lamps and tail lamps that are used in different usage states, and issues a warning with a display pattern suitable for the use. It is something.

Conventionally, various devices have been devised that constantly monitor automobile headlamps and tail lamps for breakage, regardless of whether the light switch is open or closed, and at the same time, the above-mentioned monitoring function is also beginning to be used for stop lamps.

However, head lamps, which are mainly used at night,
Tail lamps, etc. are rarely used during the day, and there is little time difference between when they are turned on at night, so they need to be constantly monitored regardless of whether the switch is open or closed. When performing a braking operation, the driver's line of sight and attention are usually focused on the surrounding situation, and for this reason, it is extremely rare to check for a break in the stop lamp during a braking operation. This function can be fully satisfied by checking before starting or during normal driving (when the stop switch is released).

However, since the night lighting lamp and the stop lamp each have their own independent current paths, and the usage conditions of the two lamps are different as described above, they must be detected and indicated by separate circuits according to their usage, which has the disadvantage of being expensive in terms of costs.

The purpose of this invention is to have a simple circuit configuration with a detection function suitable for each purpose of night lighting lamps and stop lamps, and to constantly monitor night lighting lamps regardless of whether the light switch is open or closed during the day or night.
The stop lamp can detect only when the stop switch is open (when not braking), and when the stop switch is closed (when braking), the alarm display lamp is lit regardless of the breakage of the above lamp, and the display lamp or It is an object of the present invention to provide a disconnection detection device for a lamp which also has a check function to confirm the normality of an alarm circuit including the alarm circuit.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings in terms of a combination of a tail lamp and a stop lamp as a night illumination lamp.

In the figure, reference numeral 1 indicates an on-vehicle power source, to which a series circuit consisting of a stop switch 2 and a stop lamp 3, and a series circuit consisting of a light switch 4, a current coil 5, and a tail lamp 6 are connected in parallel. , 6 are connected to the power source 1 independently from one end of the resistors 7, 8, and the above-mentioned ends are independently connected to the base of a transistor 13 via resistors 9, 10 and diodes 11, 12, respectively.

Further, diodes 14 and 15 are connected in parallel with each of the resistors 9 and 10 with their cathodes disposed on the lamps 3 and 6 side, and the diodes 11 and 1
A reed switch 16 energized by the current coil 5 is connected between the two anodes.

Note that 17 is a bias resistor, and 18 is an alarm lamp connected between the collector of the transistor 13 and the power supply 1.

In the above configuration, the operation of detecting disconnection of the lamps 3 and 6 will be explained for each operating state of the stop switch 2 and light switch 4.

(1) When both stop switch 2 and light switch 4 are open When both stop lamp 3 and tail lamp 6 are normal, since the values of resistors 7 and 8 are set large, only a small amount of current flows through lamps 3 and 6 and they do not light up. At the same time, the voltage at one end of lamps 3 and 6
Vs and Vt maintain almost zero level and do not reach the base voltage that makes the transistor 13 conductive.
The warning lamp 18 is off.

Here, if the stop lamp 3 is disconnected, one end of the lamp 3, which was at almost zero level, becomes open, and the resistors 7 and 9 and the diode 1
A power supply voltage is applied to the base of the transistor 13 via the transistor 13. At this time, the normal voltage V at one end of the tail lamp 6 is maintained at almost zero level, but the transistor 13 becomes conductive due to the backflow prevention effect of the diode 12, and the warning lamp 1
8 is lit to notify that lamp 3 is disconnected.

Further, even if the tail lamp 6 is disconnected, the warning lamp 18 is lit in the same manner using the current path of the resistors 8, 10 and the diode 12.

(2) Stop switch 2 open, light switch 4
When closed, the tail lamp 6 is turned on through the current coil 5, and at the same time, the reed switch 16 is closed. At this time, the terminal voltage Vt of the tail lamp 6 rises to almost the power supply voltage, but the terminal voltage Vs of the stop lamp 3 remains at approximately zero level, so the transistor 13 does not conduct.

Furthermore, when the reed switch 16 is closed, Vt, which is almost at the power supply voltage level, is applied to the stop lamp 3 through the resistor 10, the reed switch 16, and the diode 14, but since the value of the resistor 10 is set large, a very small current is generated. Therefore, it does not turn on.

Therefore, the anode voltage of the diodes 11 and 12 is the sum of the voltage Vs at almost zero level and the voltage drop _VF of the diode 14, and the transistor 13 is not made conductive via the diodes 11 and 12, and the alarm lamp 18 is turned off. not light. If the stop lamp 3 is disconnected here, the grounding path via the lamp 3 becomes open,
A power supply voltage is applied to the anode of the diode 11 through resistors 7 and 9.

At this time, the reed switch 16 is in the closed state, but at the same time, the voltage Vt at the power supply voltage level is applied to the anode of the diode 12 via the resistor 10, so the transistor 13 becomes conductive.
The alarm lamp 18 is turned on.

Also, if the tail lamp 6 is disconnected,
The current that was lighting the lamp 6 through the current coil 5 is cut off, and the reed switch 16 is opened. At this time, the normal stop lamp 3
The voltage Vs maintains the same zero level as the anode voltage of the diode 11, but due to the reverse current prevention effect of the diode 11 and the opening of the reed switch 16, the voltage Vs of the transistor 13 passes through the resistors 8, 10 and the diode 12. Since the power supply voltage is applied to the base, the transistor 13
conducts and lights up the alarm lamp 18.

(3) When the stop switch 2 is closed, the light switch 4 is opened and closed, and the lamp 3,
Transistor 13 regardless of the presence or absence of disconnection in 6.
conducts and lights up the alarm lamp 18.

That is, when the stop switch 2 is closed, the voltage Vs is at the power supply voltage level regardless of whether the stop lamp 3 is disconnected or not.

Therefore, when the reed switch 16 is opened, that is, the light switch 4 is opened, or the tail lamp 6 is disconnected, the voltage Vs, that is, the power supply voltage, is applied to the base of the transistor 13 due to the backflow prevention effect of the diode 12, and the transistor 13 becomes conductive. the alarm lamp 18 is turned on.

Further, when the tail lamp 6 is normal and the light switch 4 is closed, the voltage Vt is also approximately at the power supply voltage level, so the base of the transistor 13 has the above-mentioned voltage applied to the base of the transistor 13 regardless of whether the reed switch 16 is closed. Voltages Vs and Vt are applied, conduction occurs, and the alarm lamp 18 is lit.

As described in detail above, the present invention connects a current coil 5 to the current path of a night lighting lamp such as a tail lamp 6, and a resistor 7 that constantly flows a small current to the lamps 3 and 6 when the switches 2 and 4 are open. 8
Alarm lamp 1 is activated by detecting the voltage change when the wire is disconnected.
8, and when the light switch 4 is closed, the reed switch 1 is closed by the current coil 5.
When the stop switch 2 is closed, the alarm lamp 18 is activated regardless of whether the light switch 4 is opened or closed and whether or not the lamps 3 and 6 are disconnected. By configuring it to light up,
The tail lamp 6 is designed to be able to detect a disconnection not only at night when it is on, but also during the day when it is not in use, so that it can be repaired before the lamp 6 is used, and the stop lamp 3 has a disconnection detection function only when the stop switch 2 is opened. , and when the switch 2 is closed, the alarm lamp 18 is always turned on, and the lamp 18 itself can be checked for disconnection, thereby preventing a delay in confirming the disconnection of the monitoring lamps 3 and 6 due to the disconnection of the alarm lamp 18. Therefore, a relatively simple circuit can be expected to have an extremely excellent effect on safe driving.

[Brief explanation of the drawing]

The figure is a circuit configuration diagram showing an embodiment of the present invention. 3: Stotsu lamp, 5: Current coil, 6: Tail lamp as a night illumination lamp, 7, 8,
9, 10: Resistor, 11, 12, 14, 15: Diode, 13: Transistor, 16: Reed switch, 18: Alarm lamp.

Claims (1)

[Scope of utility model registration request] A series circuit consisting of a stop switch that closes in response to braking operation and a stop lamp that displays braking, and a series circuit consisting of a light switch, a current coil, and a night illumination lamp such as a tail lamp are connected in parallel to the power supply, and each of the above switches is connected in parallel to the power supply. A resistor is connected in parallel with the above, and a series circuit of a resistor and a diode is independently derived from one end of each of the above lamps and commonly connected to the input of the switching circuit. A switch which closes due to magnetic sensitivity is connected, and a diode is connected in parallel with a resistor derived from one end of the stop lamp with its cathode placed on the lamp side, and an indicator lamp is connected to the output of the switching circuit. Disconnection detection device for light equipment, which is made by connecting an alarm such as.