JPH0417810B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a direction indicator switch circuit that blinks a turn signal lamp to notify a change in the course of a vehicle.

[Conventional technology]

As shown in the block diagram of the conventional example shown in FIG. 5, when the power supply current passes through the fuse 1 and the intermittent circuit 2a is not activated inside the flasher unit 2, the ground circuit of the excitation coil 2c of the intermittent relay is used to direct the direction. It is released by switch 3. For example, when the direction indicator switch 3 is turned to the right side, the excitation coil 2c of the intermittent relay is energized via the fixed contact b. As a result, the contact point 2b starts an intermittent operation, and an intermittent power supply current is supplied to the right lamps 4a and 4b. Therefore, direction indicator switch 3
There are multiple contacts (two in the case of Figure 5) between contacts a and b.
The sum of the intermittent currents flows through each of the right lamps.

[Problem that the invention seeks to solve]

When the direction indicating operation is completed, the direction indicator switch 3 is returned to the neutral position, but at this time, the contact 2
It is sufficient if the switch b is in the disconnected state, but if the switch 3 is operated while the switch b is in the closed state, an arc will occur between the contacts a and b of the switch 3 and between the contacts a and c. This has the disadvantage that the contact surface becomes rough and the contact life is shortened.

In recent years, a large number of lamps with a large current capacity have been used for taillights, and the flash lamp switch has accordingly become larger and more expensive.

SUMMARY OF THE INVENTION An object of the present invention is to provide a direction indicator switch circuit that can prevent damage to the contact surface, extend the life of the switch, and reduce the current capacity of the switch.

[Means for solving problems]

The present invention provides a direction indicator equipped with a flasher unit that opens and closes a power supply current at a predetermined cycle, and a changeover switch that includes a first contact circuit that switches the output current of the flasher unit between a left lamp circuit and a right lamp circuit. In the switch circuit, the changeover switch has a structure that is interlocked with the first contact circuit, and is closed after the first contact circuit when closing, and is released before the first contact circuit when released. The present invention is characterized in that it includes a second contact circuit, and the second contact circuit is inserted into the current path of the opening/closing drive circuit of the flasher unit.

[Effect]

The direction indicator switch is equipped with two sets of contact circuits, a first contact that switches between the right lamp and the left lamp, and a second contact that opens and closes the flasher unit. connected to the circuit. When the switch is operated, the first contact is closed first when the second contact is to be closed, and is closed later when the second contact is to be shut off. That is, the flasher unit is activated a short time after the power supply circuit is configured, and the power supply circuit is cut off after a short time has elapsed after the flasher unit is stopped. Therefore, the lamp current, which is a large current, is always interrupted by the intermittent relay contact of the flasher unit, and is not directly opened or closed by the direction indicator switch. There is no problem because the contacts of this intermittent relay are of a capacity capable of performing a flashing operation.

〔Example〕

An embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows a block diagram of the circuit of the above embodiment. In FIG. 1, vehicle power is supplied to a flasher unit 2 via a fuse 1. In FIG. The flasher unit 2 houses a cutoff circuit 2a, a contact 2b of an intermittent relay, and an excitation coil 2c, and the contact 2b is connected to the movable contact a of the direction indicator switch 3' via a terminal T1, and the excitation coil 2c is grounded. The side is connected via the terminal T2 to the fixed contacts d and e of the direction indicator switch 3'. The fixed contact b of the direction indicator switch 3' is connected to the right lamp 4.
a and 4b, the fixed contact c is connected to the left lamps 5a and 5b, and the movable contact f is grounded.

Figure 2 shows the connection table for the turn signal switch.
In the case of a right turn, contact points a and b touch, and further contact points d and f touch. In the case of a left turn, contact points a and c are in contact, and furthermore, contact points e and f are in contact.

FIG. 3 shows a structural diagram of the contact point arrangement of the direction indicator switch. The switch lever 6 is provided with movable contacts a and f, and corresponding to the contacts a and f, fixed contacts b and d come into contact in the case of a right turn,
In the case of a left turn, the fixed contacts c and e are in contact with each other. Fixed contacts b and c are supported by spring means.

For example, when performing a right turn operation, when the switch lever 6 is turned counterclockwise by an angle θ, the contact points a and b
makes contact first. At this time, as shown in FIG. 1, the circuits leading to the right lamps 4a and 4b are constructed, but the circuit for the excitation coil 2c of the intermittent relay of the flasher unit is not yet constructed. Therefore, contact 2b of the intermittent relay is open, and the lamp does not light up.

As shown in FIG. 3, by further turning the switch lever by an angle Δθ and bringing contacts f and d into contact, the ground circuit of the excitation coil of the intermittent coil is closed as shown in FIG. 1, and the intermittent relay is activated. The operation is started and the right lamps 4a and 4b perform a blinking operation.

To stop the right turn instruction, turn the switch lever shown in FIG. 3 clockwise to first cut off the circuit of the excitation coil, thereby stopping the intermittent relay and releasing the contact 2b. Therefore, the right lamps 4a and 4b go out. Contacts a and b will then separate. That is, contacts a and b do not directly close or interrupt the lamp current.

Due to the above-described contact arrangement shown in FIG. 3, the time chart of the operation of the turn signal switch contacts and the power supply current of the right lamp when turning right, for example, is as shown in FIG. 4.

In FIG. 4, contact d is closed after a time Δt after contact b is closed, and at this point the right lamp starts blinking. When the switch lever is returned to neutral, contact d is released and the right lamp goes out at that point. Thereafter, contact b is released after a lapse of time Δt'.
Here, Δt and Δt' are the times during which the switch lever passes through the angle Δθ.

The embodiment of the direction indicator switch described above is used to explain one embodiment of the present invention, and the present invention is not limited thereto. For example, a cam contact system in which a cam is provided on the switch lever and the opposing contacts open and close as the cam moves, and other types of contacts can be similarly implemented by sliding the contacts on a surface. .

〔Effect of the invention〕

According to the present invention, since the large current of the left and right lamps is not directly connected or disconnected by the switch, the contacts are not damaged by large rush currents during activation or arcing during interruption, and the life of the contacts is significantly extended. ,
It has a remarkable effect on preventing burnout accidents caused by arc continuation during interruption. By implementing the present invention, a flash lamp switch with a small current capacity can be used, making the device economical.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention.
FIG. 2 is a connection table of contacts in the above embodiment. FIG. 3 is a diagram showing the arrangement of contacts of the direction indicator switch of the above embodiment. FIG. 4 is a time chart of the contacts and lamp current in the case of right turn operation in the above embodiment. FIG. 5 is a block diagram of a conventional example. 1... Fuse, 2... Flasher unit,
2a... Intermittent circuit, 2b... Intermittent relay contact,
2c... Intermittent relay excitation coil, 3, 3'...
Turn signal switch, 4a, 4b...right lamp,
5a, 5b...left lamp, 6...switch lever, a, f...movable contact, b, c, d, e...fixed contact.

Claims (1)

[Claims] 1. A flasher unit that opens and closes a power supply current at a predetermined cycle, and a changeover switch that includes a first contact circuit that switches the output current of the flasher unit to a left lamp circuit and a right lamp circuit. In the turn signal switch circuit, the changeover switch is connected to the first contact circuit, and when closed, is closed after the first contact circuit, and when released, is released before the first contact circuit. 1. A direction indicator switch circuit comprising: a second contact circuit having a structure such that the second contact circuit is inserted into a current path of an opening/closing drive circuit of the flasher unit.