JPS6410377B2 - - Google Patents

Abstract

PURPOSE:To effect the pashing lighting by the switching action only in a head lamp apparatus of automobiles or so by driving the head lamp to be exposed by the action of turning on a pashing switch and maintaining the exposure thereof according to the duration of turning-on action. CONSTITUTION:When a pashing switch 22 is turned on for an arbitrary duration at the overtaking time, Tr 31 is turned on to charge a capacitor 37 for the turned-on duration, whereby generating the output of a comparator 38 to turn on Trs 34 and 35. A retractor relay 3 is thereafter turned on via a relay 18, driving motors 2 and 2' to expose a head lamp 1. The on and off operations of a dimmer relay 18 are accompanied with the on and off operations of a switch 22, respectively so that the pashing lighting is performed via a lighting relay 15. And the capacitor 37 maintains the relay turned on until the voltage of the capacitor becomes below a set voltage within the discharged duration equal to the total of the turned-on period, whereby maintaining the exposed condition of the lamp 1. The pashing lighting may be thus effected by only the operation of the pashing switch.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a headlight device mounted on a motor vehicle, and particularly to one in which the headlamp is concealed and exposed.

[Conventional technology]

2. Description of the Related Art Generally, a device is known as a headlight device for an automobile, in which the headlamp is hidden in the vehicle body when the headlight is turned off, and is exposed from the vehicle body by a drive motor when the headlight is turned on.

By the way, when driving to overtake a car, so-called passing lighting is used, such as flashing the headlights at appropriate time intervals to send a signal to the vehicle traveling ahead. It may be provided.

Conventionally, in the retractable type headlight device as described above, there is a device that is provided with a passing switch to perform passing illumination, for example, as described in Japanese Patent Application Laid-Open No. 57-74232.

That is, in this concealed headlamp device, when the lighting control lever is in the OFF position, the headlamp passing operation can be performed by simply momentarily operating the dimer control lever from the HL position to the HF position. and,
The headlamp is concealed after a certain period of time (2 to 4 seconds) has passed after the last passing operation using the dimmer operating lever is completed.

[Problem to be solved by the invention]

However, there are various situations in which passing illumination is required when the vehicle is running, so the conventional headlight device, which is configured so that the headlamp always hides after a certain period of time, has disadvantages. The following cases occur:

(1) When a momentary passing maneuver is performed, such as when yielding the right of way to another at an intersection.

A situation in which the head lamp is exposed for a while even though the passing operation is instantaneous feels strange to the driver. In other words, in a momentary passing operation, it is preferable that the exposure maintenance time of the headlamp be short.

(2) When long passing maneuvers are performed, such as overtaking at high speeds.

When overtaking a vehicle in front, it is necessary to reliably send a signal to the other vehicle through long passing operations (including repetition). In such cases, the passing operation may be performed again after the passing operation is completed, and if the headlamp is immediately hidden, the headlamp must be exposed again, making it inconvenient to signal to the other party. . That is, it is difficult for the other party to confirm that the lamp is turned on while the headlamp is being exposed, and once it is hidden, it takes time until it is exposed.

In other words, in a long passing operation, it is preferable that the exposure maintenance time of the headlamp be long, so that the driver does not feel uneasy.

An object of the present invention is to enable a headlamp to be exposed and turned on only by operating a passing switch during passing lighting, and to adjust the exposure state maintenance time of the headlamp in proportion to the length of operating time of the passing switch. The object of the present invention is to provide a headlight device that can perform the following steps.

[Means to solve the problem]

A headlight device according to the present invention is a concealed type headlight device, in which a headlamp exposure state maintenance circuit is connected to a driving electric circuit and a lighting circuit, and this circuit includes a capacitor having a variable capacity;
and a time setting means for detecting the voltage change of the capacitor and outputting a signal to the drive electric circuit for adjusting the length of the exposure state maintenance time in accordance with the detection level, and before the headlamp is exposed. When the operation on the passing switch is finished in the above, the length of the exposure state maintenance time is defined from the time when the head lamp is exposed, and when the operation on the passing switch is finished after the head lamp is exposed, the passing switch operation is The present invention is characterized in that the length of the exposure state maintenance time is defined from the end point.

[Effect]

According to the above-mentioned means, when the operation of the passing switch ends before the headlamp is exposed, the length of the exposure state maintenance time is defined from the point of time when the headlamp is exposed. , the exposure of the headlamp is ensured, and the exposure maintenance time is specified to be short.

Furthermore, when the operation of the passing switch ends after the headlamp is exposed, the length of the exposure state maintenance time is defined from the point at which the operation of the passing switch ends, so if the passing operation is long, the passing operation will not be continued. The exposure maintenance time will be stipulated to be longer by the amount of time that was used.

〔Example〕

The present invention will be described below with reference to embodiments shown in the drawings.

FIG. 1 is a circuit diagram showing an embodiment of a headlight device according to the present invention, and FIGS. 2 and 3 are time charts for explaining the operation.

In this embodiment, left and right headlamps 1 and 1' of a car (the left and right have the same configuration and function, so
In the description and drawings only the headlamp 1 is shown. ) are provided in the left and right housing parts of the vehicle body so that they can be exposed and concealed, and both lamps are configured to be shifted from a concealed state to an exposed state and from an exposed state to a concealed state by driving motors 2 and 2'. There is. Also, this headlamp 1 is turned on and off by turning on and off a daylight switch 20, which will be described later.
and low beam 1b.

The motors 2, 2' are connected to a retractor relay 3,
The switch 3' can be connected to a positive terminal B of a battery (not shown) through the normally open contacts of the switches 3a and 3a'. Relay switch 3
a and 3'a are configured to be opened and closed by relay coils 3b and 3'b, and when normally closed, a short circuit is formed between the motors 2 and 2' to bring them to a sudden stop. Relay coils 3b, 3'b include
Auto switches 4 and 4' are connected in series, which are automatically switched in response to the movement of the headlamp into and out. For example, in the auto switch 4, while the headlamp 1 is transitioning from the hidden state to the exposed state, the movable iron piece 5 is in contact with the fixed contact 6 on the up side, and when the headlamp 1 reaches the exposed state, the movable iron piece 5 is switched to contact the fixed contact 7 on the down side. The other auto switch 4' is similarly constructed.

A retractor switch 8 is connected to the fixed contacts 6, 6' on the up side of the auto switches 4, 4', and this switch 8 is turned on when the headlamp is constantly used to rotate the motors 2, 2'. , move the headlamp to the exposed state. That is, when the retractor switch 8 is turned on and voltage is applied to the up-side fixed contact 6 of the auto switch 4, the retractor relay coil 3b is energized and the normally open contact of the relay switch 3a is turned on, causing the motor 2 to rotate. The headlamp 1 is then shifted from the concealed state to the exposed state. When the headlamp 1 reaches a predetermined exposure state, the movable iron piece 5 of the auto switch 4 switches and contacts the fixed contact 7 on the down side, the relay coil 3b is demagnetized, the relay switch 3a forms a short circuit, and the motor 2 is suddenly stopped.

After that, when voltage is applied to the fixed contact 7 on the down side of the auto switch 4, the relay coil 3
b is energized, the motor 2 is rotated, and the headlamp 1 is shifted from the exposed state to the hidden state. When the headlamp 1 is in a predetermined concealed state, the auto switch 7 is switched and the movable iron piece 5 contacts the fixed contact 6 on the up side, the relay coil 3b is demagnetized, the relay switch 3a forms a short circuit, and the motor 2 is suddenly stopped.

On the other hand, a lighting switch 10 is connected to the headlamp 1 via a lighting relay 15. This switch 10 is configured to be switched by manipulating a lever attached to a handle (not shown), and has a switching position _P1 for turning off the headlights and a switching position P1 for turning off the headlights, and turning on small lamps 14 such as sidemarker lights. It is composed of three switches 11, ₁₂ , and ₁₃ having three switching positions: a switching position P2 for lighting the headlamp, and a switching position P3 for lighting the headlamp. The first switch 11 is interposed in series between the battery and the small lamp 14. The second switch 12 is connected in series to the battery via a relay coil 15b of the lighting relay 15, and the relay coil 15b is a normally open relay interposed between the headlamp 1 and the positive terminal B of the battery. The switch 15a is configured to be turned on during excitation. The third switch 13 is connected to a state holding circuit 16, an abnormal power supply alarm circuit 17 via this circuit, a control relay 18, and the retractor switch 8.

Although detailed explanation is omitted, the state holding circuit 1
6 maintains the exposed state of the headlamp 1 when the lighting switch 10 is switched from the headlamp lighting position _P3 to the small lamp lighting position _P2 , and furthermore, the lighting switch 10 is switched from the small lamp lighting position _P2 to the lamp off position.
When switched to _P1 , the exposure state of the headlamp 1 is maintained for a certain period of time, thereby avoiding danger due to erroneous operation of the lighting switch 10.

Further, the abnormal power supply alarm circuit 17 is activated when the alarm lamp 17
A or a buzzer or the like is configured to issue an alarm, and this alarm can indicate an abnormality in the headlamp 1.

The relay switch 18a of the control relay 18 connects its movable iron piece to the normally closed contact of the retractor switch 18, its normally closed contact D to the down side contacts 7, 7' of the auto switches 4, 4', and its normally open state. Contact U is connected to up-side contacts 6 and 6' of auto switches 4 and 4', respectively. Relay coil 18b is provided in parallel with relay switch 18a, and is excited by turning on a driving transistor provided in an exposed state maintaining circuit, which will be described later, to cause relay switch 18a to perform a switching operation.

A day switch 20 is connected to the head lamp 1 via a day relay 19, and a relay switch 19a of this relay 19 is connected to the head lamp 1.
It is configured to switch between a high beam 1a and a low beam 1b. The relay coil 19b is connected in series to the daylight switch 20, and is configured to be excited when the switch 20 is turned on to switch the relay switch 19a to the high beam 1a position. A high beam indicator lamp 21 is connected to the low beam 1b of the headlamp 1.

A passing switch 22 is connected in series to the coil 19b of the daylight relay, and one fixed contact of this switch 22 is connected in series to the coil 15b of the lighting relay 15.
The passing switch 22 is comprised of, for example, an automatically reset type normally open push button switch.

The headlamp exposure state maintaining circuit 30 according to this embodiment includes the first to sixth transistors 31 to 36.
, a capacitor 37, a comparator 38, a plurality of resistors, and a plurality of diodes.

The first transistor 31 has an emitter connected between the retractor switch 8 and the relay switch 18a of the control relay 18, a collector connected to the capacitor 37, and a base connected to the passing switch 22.

The fifth transistor 35 has an emitter connected to the retractor switch 8, a collector connected to the relay coil 18b of the control relay 18,
The base is connected to the collector of the fourth transistor 34.

The emitter of the fourth transistor 34 is grounded, and the output terminal of a comparator 38 is connected to its base.

One input terminal 38a of the comparator 38 is connected between the resistors _R1 and R2, and the other input terminal 38a is connected between the resistors R1 and _R2 .
8b is connected to the positive electrode side of the capacitor 37. This comparator 38 is configured to apply a bias potential to the base of the fourth transistor 34 at its output terminal when the potential at the input terminal 38b on the capacitor side is larger than a reference set value, and the set value is set at the input terminal. It is set appropriately by resistors R ₁ and R ₂ for setting the partial voltage connected to 38a.

The capacitor 37 has a relatively large capacitance and is configured to be gradually charged and discharged.

A resistor R ₃ is further connected to the positive side of the capacitor 37.
The collector of the third transistor 33 is connected through the terminal, and the emitter of the third transistor 33 is grounded.

The base of the third transistor 33 is connected to the collector of the second transistor 32, and the emitter of the second transistor 32 is grounded. The base of the second transistor 32 is connected to the relay switch 3a of the motor 2, 2' and the retractor relay 3, 3'.
3'a through diodes.

The collector of the second transistor 32 is further connected to the emitter of a sixth transistor 36, and the collector of the sixth transistor 36 is connected to the collector of the fifth transistor 36.
It is connected to the collector of the transistor 35 and the collector of the first transistor 31 . moreover,
The base of the sixth transistor 36 is grounded via a Zener diode.

In FIGS. 2 and 3, A is the time chart of the passing switch 22, B is the control relay 18, C is the capacitor 37, D is the comparator 38, and E is the time chart of the retractor motors 2, 2'. FIG. 2 shows how long it takes to turn on the passing switch 22 to
Figure 3 shows the case where the closing time of the passing switch 22 is longer than the operating time of the retractor motors 2, 2' (when the switch 22 is turned on intermittently, the total closing time is within the operating time of (including cases where it becomes long). are shown respectively.

Next, the action will be explained.

For example, when driving in the daytime, the lighting switch 10 is set to the position where the head lamps are turned off.
When set to _P1 , the headlamp 1 is turned off and hidden within the vehicle body frame, and the retractor switch 8 is turned off. In this case, the movable iron piece 5 of the auto switch 4 is in contact with the contact 6 on the up side (the same applies to the auto switch 4').

When the driver of a car turns on the passing switch 22 to overtake, etc., the positive terminal B of the battery is turned on.
From the relay coil 15 of the lighting relay 15
Since power is applied to the terminal b via the passing switch 22, the relay switch 15a is turned on and the headlamp 1 can be turned on. At the same time, day relay 1
The coil 19b of No. 9 is excited by the energizing circuit of the lighting relay switch 15a, the day relay coil 19b, the passing switch 22, and the ground, the day relay switch 19a is turned on, and the high beam 1a side of the head lamp 1 is turned on.

Subsequently, the following operations automatically perform headlamp exposure, exposure state maintenance, and passing illumination.

(1) When the passing switch 22 is turned on, the base of the first transistor 31 of the exposed state maintaining circuit 30 is biased, and the first transistor 31 is turned on.

(2) When the first transistor 31 is turned on, the first
Charging of the capacitor 37 is started via the transistor 31, the coil 18b of the control relay 18 is excited, and the normally open contact U of the relay switch 18a is turned on.

(3) As a result, the battery, the retractor switch 8, the control relay switch 18b, the up side contacts 6, 6' of the auto switches 4, 4',
The movable iron pieces 5, 5', retractor relay 3,
The coils 3b, 3'b of 3' and the ground are energized, and the retractor relay switches 3a, 3'a are turned on.

(4) When the retractor relay switches 3a and 3'a are turned on, the battery
The motors 2, 2' are rotated by the energizing path 3'a. This driving causes the headlamp 1 to shift from the concealed state to the exposed state.

(5) On the other hand, when the first transistor 31 is turned on, the sixth transistor 36 is turned on and a voltage is applied to the second transistor 32. At this time, the base of the second transistor 32 is the battery, the retractor relay switch 3a, 3'a,
It is turned on because it is biased through the diode.

(6) By turning on the second transistor 32, the third transistor 33 is turned off, and the discharge path of the capacitor 37 is cut off.

(7) Therefore, the capacitor 37 continues to be charged via the battery, the retractor switch 8, and the first transistor 31. As shown in FIGS. 2 and 3, the manner in which the capacitor 37 is charged differs depending on the on-time of the passing switch 22. Therefore, the operation of the headlamp exposure state maintenance circuit 30 is as follows (8). or different as in (9).

(8) As shown in Figure 2, press the passing switch 2.
2 is turned on momentarily and its ON time is shorter than the time required for exposure transition of the retractor motors 2 and 2'.

When the passing switch 22 is turned off,
The first transistor 31 is turned off. However, the second transistor 32 has its base connected to the battery and the retractor relay switch 3.
Since it continues to be biased through the diodes a and 3'a, it continues to be turned on. This results in
The third transistor 33 continues to be turned off and continues to block the discharge path of the capacitor 37.

As shown in FIG. After one transistor 31 is turned off, it does not charge or discharge, and maintains the charged amount of charge.

On the other hand, when the charge value of the capacitor 37 becomes equal to or higher than the reference set value e, the potential of the input terminal 38b on the capacitor side of the comparator 38 becomes equal to or higher than the set value. Therefore, after a short time t has elapsed from the start of charging, the comparator 38 outputs an output. . This output state of the comparator 38 is maintained until the charge weight of the capacitor 37 falls below the set value e, as shown in FIG.

When the comparator 38 outputs, the fourth transistor 34 is turned on because its base is biased. As a result, the base of the fifth transistor 35 is biased even though the first transistor 31 is off, so that the fifth transistor 35 is kept on.

As the fifth transistor 35 remains on, the control relay coil 18b continues to be excited, and the relay switch 18a continues to be on.

Therefore, the motors 2, 2' are connected to the first transistor 31, that is, the passing switch 2
2 continues to rotate even though it is off, ensuring that the headlamp 1 is brought to its proper exposure state.

When the headlamp 1 is brought into a predetermined exposed state, the movable iron pieces 5, 5' of the auto switches 4, 4' are automatically switched to the down side contacts 7, 7'.

Auto switch 4, 4' down side contact 7,
Since the connection circuit 7' is cut off at the contact D of the control relay switch 18a, the retractor relay coils 3b, 3b' are demagnetized and the relay switches 3a, 3'a are turned off. This creates a short circuit,
The motors 2, 2' are suddenly stopped when the headlamp 1 is exposed.

When the retractor switches 3a, 3'a are turned off, the path to the battery is cut off at these switches 3a, 3'a, so the second
The base of the transistor 32 is debiased and turned off, thereby turning on the third transistor 33.

When the third transistor 33 is turned on, the capacitor 37 starts discharging as shown in FIG. The potential due to the discharge of this capacitor 37 is applied to one input terminal 3 of the comparator 38.
8b, the comparator 38 maintains its output.

As a result, the fourth transistor 34 continues to be turned on, the fifth transistor 35 also continues to be turned on, and the control relay coil 18b is kept energized. Therefore, since the control relay switch 18a continues to be turned on, the movable iron pieces 5, 5 of the auto switches 4, 4'
5' is in contact with the down side contacts 7, 7', the motors 2, 2' are not rotated. Therefore, the headlamp 1 is maintained in an exposed state.

The discharge of the capacitor 37 progresses as shown in FIG. 2, and its potential reaches the reference setting value e.
When the voltage is below, the comparator 38 is in a state where it stops outputting.

As a result, the fourth transistor 34 is turned off, the fifth transistor 35 is also turned off, and the control relay coil 18b is demagnetized.
Control relay switch 18a is contact D
side is switched on.

When the control relay switch 18a is switched, the battery, retractor switch 8, relay switch 18a, down side contacts 7, 7' of auto switches 4, 4', movable iron pieces 5, 5', retractor relay coil 3b,
3'b and ground, the relay coils 3b, 3'b are excited and the relay switches 3a, 3'a are turned on. This results in
As shown in FIG. 2, the motors 2, 2' are energized and driven to rotate, and the headlamp 1 is shifted from the exposed state to the hidden state. Therefore, the headlight device has been returned to its original state.

(9) As shown in Figure 3, press the passing switch 2.
2 is longer than the exposure transition time of the retractor motors 2 and 2'.

Even after the retractor motors 2, 2' are driven to rotate and the head lamp 1 is moved to the exposed state, and the auto switches 4, 4' are switched to the down side and the head lamp 1 is suddenly stopped, the passing switch 22 is not turned on. Continuing, since the first transistor 31 is turned on, the capacitor 37 continues to be charged even after the retractor motors 2, 2' stop rotating, as shown in FIG.

During this time, the first transistor 31 is turned on, and since the potential of the capacitor side terminal 38b of the comparator 38 is higher than the set value e, the control relay 18 is turned on.

When the passing switch 22 is turned off,
Since the first transistor 31 is turned off, charging of the capacitor 37 is stopped. At this time, the second transistor 32 is turned off because its base is grounded via the retractor relay switches 3a and 3'a, and the third transistor 33 is thereby turned on. Therefore, as shown in FIG. 3, capacitor 37 gradually discharges.

As is clear from the comparison between FIG. 2C and FIG. 3C, the amount of charge of the capacitor 37 in FIG. 3 is larger than that in FIG. 2, so the amount of charge of the capacitor 37 becomes less than the set value e. The discharge time until then is correspondingly extended.

Therefore, as shown in FIG. 3, the output time of the comparator 38 also depends on this capacitor 37.
The ON time of the control relay 18 is extended corresponding to the discharge time of the control relay 18.

As a result, as shown in FIG. 3E, the exposure state time of the headlamp 1 is extended corresponding to the ON time of the passing switch 22.

The operation after the discharge potential of the capacitor 37 reaches the set value is the same as in the case (8) above.

Note that when the passing switch 22 is turned on and off in the exposed state of the headlamp 1, the coil 15b of the lighting relay 15 is excited and demagnetized, thereby turning on and off the same switch 15a, and also turning on and off the day relay switch 19a. Since the light is also turned on and off by the day relay coil 19b, passing lighting can be performed at any time. Furthermore, the exposure state duration of the headlamp 1 is extended by the amount by which the passing switch 22 is turned on or off.

According to this embodiment, the exposure state of the headlamp can be automatically created simply by operating the passing switch. Therefore, the passing lighting can be turned on simply by turning on the passing switch, which reduces the burden on the driver, avoids danger due to distraction from the road ahead, and improves safe driving.

In addition, even when the passing switch is turned on momentarily, the head lamp can be reliably shifted to the exposed state, and the exposed state can be maintained, allowing the user to wait for the next passing lighting. be able to.

Furthermore, the duration of the exposed state of the headlamp can be extended in accordance with the operating time of the passing switch. Therefore, the exposed state of the headlamp can be maintained for a long time following the long passing lighting with a high degree of danger. Therefore, the headlamp exposure transition time during the subsequent passing operation is omitted, and an instantaneous passing operation is performed. That is, it becomes possible to speed up the passing operation in accordance with the increase in the degree of risk.

FIG. 4 is a circuit diagram of a main part showing another embodiment of the present invention, and the difference from the above embodiment is that in a headlamp exposure state maintaining circuit 30A, the second transistor 32 and the third transistor in the same circuit 30 are 33 and the sixth transistor 36 are omitted, and instead, the positive terminal side of the capacitor 37 is connected to the down side contacts 7, 7' of the auto switches 4, 4' via a diode.

The passing operation of the headlight device according to this embodiment is performed in accordance with the previous embodiment, and will be briefly explained as follows.

(1) When the passing switch 22 is turned on for an arbitrary period of time, the first transistor 31 is turned on.

(2) When the first transistor 31 is turned on, the capacitor 37 is charged for the amount of time the passing switch 22 is turned on.

(3) At the same time, the potential of the capacitor 37 becomes higher than the reference voltage value determined by the resistors R ₁ and R ₂ in a short time, and the comparator 38 outputs. As a result, the fourth transistor 34 is turned on, and the fifth transistor 35 is also turned on.

(4) When the fifth transistor 35 is turned on, the control relay coil 18b is excited and the switch 18a is turned on. As a result, the battery, retractor switch 8, control relay switch 18a, auto switch 4,
4' up side contact 7, 7', its movable iron piece 5,
5', retractor relay coils 3b, 3'a, and ground are energized, and retractor relay switch 3a is turned on.

(5) Therefore, the motors 2 and 2' are rotated, and this drive causes the headlamp 1 to shift from the concealed state to the exposed state. During this transition driving, the control relay switch 18a continues to be turned on based on the potential of the capacitor 37.

(6) When the headlamp 1 is completely exposed, the movable iron pieces 5, 5' of the auto switches 4, 4' are brought into contact with the down side contacts 7, 7'. This results in
Even though the control relay switch 18a is turned on, the retractor relay coils 3b, 3'b are disconnected from the power supply path, and therefore,
Relay switches 3a and 3'a are turned off. As a result, a short circuit is formed, and the motor 2,
2' is abruptly stopped and the headlamp 1 remains exposed.

(7) When the headlamp 1 is exposed, if the passing switch 22 is turned on or off, the day release switch 19a is turned on or off. At the same time, the lighting relay switch 15a is also turned on and off, so that passing lighting is performed.

(8) On the other hand, when the headlamp 1 is fully exposed and the movable iron pieces 5, 5' of the auto switches 4, 4' contact the down side contacts 7, 7', the positive terminal of the capacitor 37, the resistor , diode, movable iron piece 5, 5', down side contact 7,
7', the relay coils 3b, 3'b, and the discharge path to the ground, the relay coils 3b, 3'b are discharged except when the passing operation is being performed as described in (7) above.

(9) The discharging time of this capacitor 37 is proportional to the charging time of the capacitor, that is, the on duration time of the passing switch 22 in (1) and (7) above, or the number of on and off times (total on time). . Then, the control relay switch 18 is operated until the potential of the capacitor 37 becomes lower than the set value.
a continues to be turned on.

(10) As a result, the motors 2, 2' continue to be stopped, the headlamp 1 remains exposed, and the next passing operation is waited for.

(11) Thereafter, if there is no particularly dangerous situation and no passing operation is performed, the potential of the capacitor 37 becomes below the set value and the output voltage of the comparator 38 also becomes low. Along with this, the fourth transistor 34 is turned off, the fifth transistor 35 is also turned off, the control relay coil 18b is deenergized, and the switch 18a is switched.

(12) Therefore, the down side contacts 7, 7' of the battery, retractor switch 8, control relay switch 18a, auto switches 4, 4',
Power is supplied to the retractor relay coils 3b, 3b' through the paths of the movable iron pieces 5, 5', and the switches 3a, 3'a are turned on.

(13) When the retractor relay switches 3a, 3'a are turned on, the motors 2, 2' are supplied with power and rotated, and this driving causes the headlamp 1 to shift from the exposed state to the concealed state.

(14) When head lamp 1 is completely hidden,
The movable iron pieces 5, 5' of the auto switches 4, 4' are brought into contact with the contacts 6, 6' on the up side, the retractor relay coils 3b, 3'b are deenergized by cutting off the power supply, and the switches 3a, 3' a is turned off.

(15) When the retractor relay switches 3b, 3'b are turned off, a short circuit is formed and the motors 2, 2' are suddenly stopped. Therefore, it has been restored to its original state.

〔Effect of the invention〕

As explained above, according to the present invention, the following effects can be obtained.

(1) The length of time the headlamp remains exposed can be adjusted in proportion to the length of time the passing switch is operated.

(2) In a momentary passing operation, the headlamp shifts to the exposed state and waits for the next passing operation, but if there is no passing operation, it will be hidden in a short time, causing the driver to feel uncomfortable. It will be resolved.

(3) In a long patching operation, the headlamp remains exposed for a long time after the patching operation is completed, so when the patching operation is repeated,
Signals to the other party become smoother. By the way, it is difficult for the other party to see if the headlamp is turned on in the middle of exposure.

(4) Since the length of time for which the headlamp is kept exposed changes depending on the length of time the passing switch is operated, it is possible to prevent the driver from feeling uncomfortable.

[Brief explanation of drawings]

Figure 1 is a circuit diagram showing one embodiment of the present invention, Figure 2 is a circuit diagram showing an embodiment of the present invention.
3 and 3 are time charts for explaining the operation, and FIG. 4 is a circuit diagram showing another embodiment of the present invention. 1... Head lamp, 2, 2'... Motor, 3,
3'... Retractor relay, 4,4'... Auto switch, 8... Retractor switch, 10... Lighting switch, 14... Small lamp, 15... Lighting relay, 18... Control relay, 19... ...Daimary Relay, 20...
...Daylight switch, 22...Passing switch, 30...Headlamp exposure state maintenance circuit, 3
1, 32, 33, 34, 35, 36...Transistor, 37...Capacitor, 38...Comparator.

Claims (1)

[Claims] 1. A headlamp installed in a vehicle body so as to be concealed and exposed, a drive motor for exposing and concealing this headlamp, a driving electric circuit for this motor, and a lighting circuit for lighting said headlamp.
In a headlight device equipped with a passing switch that commands passing lighting to the headlamp, the drive electric circuit and lighting circuit drive the headlamp to expose when the passing switch is operated, and after the headlamp is exposed, A headlamp exposure state maintenance circuit is connected to the headlamp, which adjusts the length of time the headlamp is kept exposed in accordance with the length of time the passing switch is operated. and a time setting means for detecting a voltage change in the headlamp and outputting a signal to the drive electric circuit for adjusting the length of the exposure state maintenance time in accordance with the detection level, the headlamp is exposed before the headlamp is exposed. When the operation of the passing switch is completed, the length of the exposure state maintenance time is defined from the time when the headlamp is exposed, and
The headlight device is characterized in that when the operation of the passing switch ends after the headlamp is exposed, the length of the exposure state maintenance time is defined from the time when the operation of the passing switch ends.