JPS583699Y2 - Vehicle turn signal device - Google Patents

Description

[Detailed explanation of the invention] This invention provides that while the turn signal lamp of the vehicle is flashing,
This relates to an improvement in a turn signal device for a vehicle that cuts off power to an indicator lamp such as a stop lamp, tail lamp, or small lamp on the side that is blinking so as not to impair the visibility of the turn signal lamp. It is.

In general, most vehicle tail light devices have a structure in which lamps each having an independent function are housed in a single light body. In this case, the blinker lamp will blink in the vicinity of where the constant illuminance instruction is displayed, and there will be no difference in brightness between the two lamps, resulting in poor visibility.

In order to solve these problems, a turn signal device for a vehicle has been proposed as described in Japanese Patent Publication No. 1157/1983.

FIG. 1 is a circuit diagram showing the configuration of the turn signal device described in the publication.

A brief explanation of its configuration and operation is as follows.

First, when the indicator lamp energizing switch 1 is closed, the indicator lamp Lb is energized via the transistor Q3 of the turn signal device TU.

When the direction selection switch 2 for selecting either the left or right direction is turned on to the position shown in the figure while the indicator lamp Lb is lit, an intermittent current due to the intermittent operation of the flasher relay 3 is applied to the direction selection switch 2. The signal is supplied to the turn signal device TU via the turn signal device TU, thereby causing the turn signal lamp La to blink.

The intermittent current is also supplied to the capacitor C1 via the diode D1, thereby charging the capacitor C1.

When the charging voltage of the capacitor C1 reaches a predetermined voltage, the charging voltage of the capacitor C1 is supplied to the base of the transistor Q1 via the resistor R1, so that the transistor Q1 becomes conductive.

Due to the conduction of the transistor Q1, the transistor Q2, to which the base current was previously supplied via the resistor R2, becomes non-conductive because its base potential becomes the ground potential.

When transistor Q2 becomes non-conductive, transistor Q3, which had been supplied with a base current through the collector and emitter of transistor Q2, becomes non-conductive.

As a result, power supply to the indicator lamp Lb is cut off.

In this case, the discharge time constant of the capacitor C1 determined by the capacitor C1 and the resistor R1 is set to be slightly longer than the time when the turn signal lamp La is turned off while the turn signal lamp La is blinking. During operation, the transistor Q1 is maintained in a conductive state to prevent the indicator lamp Lb from being lit.

Then, when the direction selection switch 2 is returned to the neutral position, the transistor Q1 becomes non-conductive, and the indicator lamp Lb lights up again to display an instruction.

In this way, the conventional turn signal device has a transistor interposed between the indicator lamp energization switch 1 and the indicator lamp Lb, and the intermittent energization current to the turn signal lamp La is charged and held in the charging/discharging circuit, and this charge is maintained. The transistor interposed between the indicator lamps Lb is maintained in a non-conductive state by applying a voltage.

However, in this conventional device, since the capacitor C1 is charged using the intermittent current of the flasher relay 3, a large charging current is superimposed on the lighting current of the turn signal lamp La when charging of the capacitor C1 starts. However, there is a disadvantage that the contacts of the flasher relay 3 are deteriorated, and regular inspection of the flasher relay 3 is required.

Therefore, the present invention was devised to eliminate the drawbacks of the conventional turn signal device described above.The purpose of the present invention is to turn off the indicator lamp while the turn signal lamp is flashing, without degrading the contacts of the flasher relay. An object of the present invention is to provide a turn signal device according to the present invention.

In order to achieve this object, the turn signal device according to the present invention does not use the intermittent current generated by the flasher relay as the charging current of the charging/discharging circuit, but instead uses it as a charging/discharging control signal.

Hereinafter, the present invention will be explained in detail based on the illustrated embodiments.

FIG. 2 is a circuit diagram showing an embodiment of the turn signal device according to the present invention, and the same parts as those in FIG. 1 are given the same symbols, and the explanation thereof will be omitted.

In the figure, an indicator lamp energizing switch 1 is connected to the terminal a of the turn signal device TU, a direction selection switch 2 and a turn signal lamp La are connected to the terminal A, and an indicator lamp Lb is connected to the terminal C. has been done.

A capacitor C11- is connected between terminal a and terminal S.
A charging circuit for a charging path of the turn signal lamp La is formed with one terminal of the resistor R12 and the diode D11.

In addition, when the terminals on both ends of the capacitor C11 reach the "H" level ("H" level: +B), the capacitor C11 is connected to the capacitor C11.
A discharge circuit consisting of a resistor R11 and a diode D12 for rapidly discharging the 11 charges is connected.

On the other hand, a transistor Q12 is connected between terminal a and terminal C, and the collector of this transistor Q12 is
Between the emitters is a diode D13 in the opposite direction to the power supply.
is connected.

This diode D13 is used to prevent the potential of the terminal a from dropping to the negative side due to noise, etc., and the dropped potential exceeding the reverse withstand voltage between the collector and emitter of the transistor Q12, thereby preventing the transistor Q12 from being destroyed. It is something.

And between the terminal a and the capacitor C11←) side,
A voltage regulator diode ZD and a transistor Q11 are connected, and the transistor Q11 has a charging voltage c of a capacitor C11 that is higher than the voltage value obtained by adding the zener voltage Z of the voltage regulator diode ZD and the emitter-base voltage VER of the transistor Q11. Then, conduction will occur.

Then, due to the conduction of the transistor Q11, the charging voltage of the capacitor C11 becomes ■c.

Control is performed so that =VZ+VF;B. At the same time, transistor Q11 transfers its collector output to transistor Q1
2 to the base of transistor Q12, making transistor Q12 conductive.

Therefore, the constant voltage diode ZD and the transistor Q11 constitute a control circuit that regulates the charging voltage of the capacitor C11 to a constant voltage and controls the transistor Q12.

The operation of the turn signal device configured as described above will be explained below.

First, the operation when only the indicator lamp energization switch 1 is turned on will be described.

First, when the indicator lamp energization switch 1 is turned on, the terminal a - capacitor C11 - resistor R12 - diode D11
- The capacitor C11 is charged through the path of the turn signal lamp La.

In this case, since the resistance value of the resistor ft12 is set to about 10 Ω, even if current flows through the turn signal lamp La, this current value is not sufficient to light the lamp La.

Therefore, the turn signal lamp La will not be turned on while the capacitor C11 is being charged.

Then, when the charging voltage of the capacitor C11 exceeds a predetermined voltage after a certain period of time (a period corresponding to a charging time constant), the transistor Q11 becomes conductive.

In other words, when the charging voltage of the capacitor C11 exceeds the Zener voltage Z of the voltage regulator diode ZD and the emitter-base voltage VBB of the transistor Q11, the transistor Q
11 is conductive.

Due to the conduction of this transistor Q11, the capacitor C
The charging voltage Vo of No. 11 is regulated so that Vc=VZ+VEB.

Then, a base current is applied from the collector of the transistor Q11 to the base of the transistor Q12, making the transistor Q12 conductive.

As a result, a current is applied to the indicator lamp Lb via the indicator lamp energizing switch 1, terminal a, and transistor Q12, terminal C, so that the indicator lamp Lb lights up.

Next, while the indicator lamp Lb is lit, the direction selection switch 2
The operation when the is inserted into the position shown in the figure will be explained.

When the direction selection switch 2 is turned on, the intermittent operation of the flasher relay 3 supplies an intermittent current to the terminals and the turn signal lamp La as shown in FIG. 3a.

Then, the turn signal lamp La blinks due to this intermittent current.

The time indicated by 11 in FIG. 3a is the lighting operation time, and the time indicated by t2 is the light-off operation time.

On the other hand, due to this intermittent current, the potential of the terminal has a waveform as shown in FIG.

As the potential of the terminal D1 repeatedly changes from the "H" level to the "L" level in this way, the diode D11 repeats the conductive state and the non-conductive state in response to this change.

That is, when the potential of the terminal D1 is at the "H" level, the diode D11 becomes non-conductive, and when it is at the "L" level, the diode D11 becomes conductive.

The diode D11 repeating the conductive state and the non-conductive state corresponds to whether or not the charging path of the capacitor C11 is cut off.

In other words, when diode D11 becomes non-conductive, the charging path of capacitor C11 is cut off, and capacitor C11
The charges are rapidly discharged in the discharge path of the resistor ft11 and the diode D12.

When the charge in the capacitor C11 is discharged and its charging voltage becomes less than a predetermined voltage, the transistor Q11 becomes non-conductive.
Along with this, transistor Q12 also becomes non-conductive.

As a result, the instruction lamp Lb, which had been displaying instructions up to that point, goes out.

Then, when the potential of the terminal S reaches the "L" level, the diode D11 becomes conductive, and a charging path for the capacitor C11 is formed.

Therefore, capacitor C11 starts charging again, but
Since the charging time until the charging voltage reaches a predetermined voltage, that is, the voltage required to make the transistor Q11 conductive, is set to be longer than the turning-off operation time of the turn signal lamp La, the charging voltage waveform is shown in FIG. 3C. As shown,
The battery will be discharged again before the predetermined voltage is reached.

On the other hand, the potential on the side of the capacitor C11 changes as shown in FIG. 3d as the flasher relay 3 operates on and off.

Therefore, the emitter and base of the transistor Q11 are reverse biased, and the transistor Q11 maintains a non-conducting state.

In this case, the reverse bias for transistor Q11 is
The potential on the ←) side of capacitor C11 is the voltage regulator diode Z.
The Zener voltage of D becomes less than ■h, and the capacitor C1
The capacitor C11 is released when the charging voltage of the capacitor C11 reaches a predetermined voltage (VBE+VZ), but before the charging voltage of the capacitor C11 reaches the predetermined voltage (VBE+Vz).
As a result, the transistor Q11 maintains a non-conducting state while the intermittent current from the flasher relay 3 is supplied to the terminal.

Then, the direction selection switch 2 is returned to the neutral position, and when the charging voltage of the capacitor C11 reaches a predetermined voltage, the transistors Q11 and Q12 become conductive, and the indicator lamp Lb starts to display an instruction again.

As is clear from the above description, the turn signal device of this embodiment uses the intermittent current generated by the flasher relay 3 as a control signal for determining whether or not to cut off the charging path of the charging/discharging circuit.

Therefore, the current flowing through the contacts of the flasher relay 3 is only the energizing current (lighting current) of the turn signal lamp La, and there is no possibility that the charging current of the capacitor is superimposed and deteriorates the contacts as in the conventional case.

Furthermore, the charging current for the capacitor C11 is made to flow through the switch 1 for energizing the indicator lamp, but since it flows through the resistor R12 having a large resistance value, the charging current value at the time of charging is small, and the indicator lamp There is no possibility of deterioration of the contacts of the energizing switch 1.

In particular, in this case, since the charging voltage of the capacitor C11 is regulated to a constant voltage by the constant voltage diode ZD and the transistor C11, the withstand voltage of the capacitor C11 can be reduced, and as a result, the voltage of the capacitor C11
It has the advantage that the shape can be made small.

Further, the constant voltage diode ZD also functions to increase the conduction potential of the transistor Q11.

Therefore, while the turn signal lamp La is blinking,
Even if a certain degree of potential difference appears between the lighting current and the terminal a due to the voltage drop due to the resistance valve in the line leading to the turn signal lamp La, the transistor Q11 will not become conductive.

In other words, during the blinking operation of the turn signal lamp La, a certain amount of potential difference occurs between the terminals a and b, and the transistor Q
11 becomes a forward bias state and becomes conductive, thereby preventing the indicator lamp Lb from being erroneously turned on.

Furthermore, since the device according to this embodiment is configured with three terminals, the number of wires is reduced, and this reduction in the number of wires has the advantage of facilitating various surge countermeasures.

FIG. 4 is a circuit diagram showing another embodiment of the vehicle turn signal device according to the present invention, and the same parts as those in FIG. 2 are given the same symbols and the explanation thereof will be omitted.

In this figure, the main difference from FIG. 2 is that capacitor C11 is charged through the path of terminal a - capacitor C11 - resistor R12 - terminal d - ground, and that terminals are connected to resistor R11 and diode D12. In addition, as a negative surge countermeasure, diode D, which has the same function as diode D13, is connected directly to the connection point of diode D13.
14 is connected between terminal a and terminal d.

The operation is similar to the circuit shown in Fig. 2, but the reason why the capacitor C11 is charged through the charging path using only the resistor R12 is that the turn signal lamps La and La' (usually two ~3 pieces) are all disconnected, and a charging path for capacitor C11 is no longer formed.
This is to prevent the function of the turn signal device from failing.

Therefore, in this embodiment, a new terminal d is added,
Accordingly, the number of wiring lines is the same as that of the conventional circuit, but other effects are the same as the circuit shown in FIG.

Note that similar results can be obtained even if the transistors Q11 and Q12 are connected in different ways as shown in FIGS. 5 and 6.

FIG. 7 is a circuit diagram showing a modified example of the embodiment shown in FIG. +) power supply one terminal b-diode D15-capacitor C11 one terminal a-(+) power supply path.

Even in this case, the same effect as the embodiment shown in FIG. 4 can be obtained.

Note that in each of the embodiments described above, the transistor Q11
As shown in FIG. 8, the constant voltage diode ZD that increases the conduction potential may be formed by connecting a plurality of diodes D20 to D23 in series and utilizing the forward voltage drop of these diodes. As described above, according to the present invention, the intermittent current of the flasher relay is not used as the charging current of the charging/discharging circuit, but is used as a control signal for charging/discharging.

The charging/discharging circuit is charged with the indicator lamp current, and the charging current is passed through the high resistance of the charging/discharging circuit.

Further, the charging voltage of the charging/discharging circuit is regulated to a constant voltage by a control circuit (C).

Therefore, the charging current of the charging/discharging circuit is not superimposed on the lighting current of the turn signal lamp, and deterioration of the contacts of the flasher relay can be prevented.

Furthermore, since it becomes possible to use a low-voltage capacitor in the charging/discharging circuit, the device can be miniaturized, making it extremely suitable as an in-vehicle device.

[Brief explanation of the drawing]

Fig. 1 is a circuit diagram showing the configuration of a conventional turn signal device, Fig. 2 is a circuit diagram showing an embodiment of a turn signal device for a vehicle according to the present invention, and Fig. 3 shows the operation of the circuit shown in Fig. 2. 4 is a circuit diagram showing another embodiment of the present invention; FIGS. 5 to 7 are circuit diagrams showing modifications of the embodiment shown in FIG. 4; FIG. 8 is a circuit diagram showing a modification of the embodiment shown in FIG. FIG. 6 is a circuit diagram showing a modification of the constant voltage diode in each embodiment of the present invention. 1... Indicator lamp energization switch, 2...
...Direction selection switch, 3...Flasher relay, La...Turn signal lamp, Lb...
... Indication lamp, TU ... Turn signal device.

Claims (1)

[Scope of utility model registration request] In a vehicle turn signal device that turns off an indicator lamp such as a stop lamp or small lamp on the side when the turn signal lamp is blinking,
The charging time until the charging voltage reaches a predetermined voltage is set longer than the turn-off time of the turn signal lamp, and the charging current is supplied via an indicator lamp energization switch that turns on the indicator lamp, and the charging voltage is A charging/discharging circuit that discharges when the output current of the direction selection switch for blinking the turn signal lamp is in a energized state, and regulating the charging voltage to a constant voltage when the charging voltage of this charging/discharging circuit reaches a predetermined voltage. A vehicle comprising: a control circuit that outputs an output; and a semiconductor switching element that is rendered conductive by the output voltage of the control circuit; the indicator lamp is energized via the indicator lamp energization switch and the semiconductor switching element. Turn signal device.