JPH0232171B2 - - Google Patents

Abstract

PURPOSE:To improve the driving safety and to protect the driver in facing car from glare by adjusting the irradiation angle of headlight through remote operation in cabin with correspondence to the attitude of chassis. CONSTITUTION:Headlights 1, 1' and driving sections 2, 2' are provided to the left and right. The headlight 1 is held on headlight holding member 5 while a supporting chip 6 provided at the upper portion of said member 5 is fixed rotatably to the chassis. The lower portion of the holding member 5 is coupled to the end of driving body 7 in driving section 2. The driving section 2 is secured to the chassis in the vicinity of the headlight 1 to displace the coupling point 5a with the headlight 1 against the chassis through displacement of movable body 7 movable against the chassis. Consequently, the inclination of the headlight 1 is varied. The operating section 3 is provided with a multi-stage switch 8 for determining the inclination angle of the headlight 1 against the chassis.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an illumination angle adjustment device for a vehicle headlamp. Specifically, it relates to an adjustment device that can adjust the illumination angle of a pair of left and right headlights, which are tiltably held relative to the vehicle body, in multiple stages by remote control from the driver's seat, etc., and is easy to control. The object of the present invention is to provide a novel vehicular headlamp illumination angle adjustment device that can perform stable adjustment operations using a circuit and a mechanism.

BACKGROUND TECHNOLOGY In vehicles, especially automobiles, the body and axle are connected by a suspension system consisting of leaf springs, coil springs, etc. Therefore, when a large load is applied to the front or rear side of the vehicle body, the posture of the vehicle body changes. The front of the vehicle is sunk forward or backward, and the angle of illumination of the headlights relative to the road surface changes, impairing driving safety.In addition, if the headlights are oriented upwards as a result of sunk backwards, it may cause problems for oncoming vehicles. There is a danger that the driver will be seriously dazzled.

Purpose of the Invention Therefore, the present invention aims to provide an adjustment device that can adjust the irradiation angle of a pair of left and right headlights by remote control from the driver's seat, and in particular, it is an object of the present invention to provide an adjustment device that can adjust the illumination angle of a pair of left and right headlights by remote control from the driver's seat. An object of the present invention is to provide a novel vehicular headlamp illumination angle adjustment device that can perform stable adjustment operations using the following mechanisms.

Summary of the Invention In order to achieve the above-mentioned object, the vehicular headlamp illumination angle adjustment device of the present invention includes a pair of left and right headlights that are tiltably held relative to the vehicle body, and a pair of left and right headlights. A drive unit that tilts the headlight is provided corresponding to the drive unit, and an operation unit that operates the pair of drive units, and each of the drive units is provided with a motor and a position relative to the vehicle body. An operating switch including a driving body moved and connected to a part of the headlamp and a multi-stage switching control section, the operating section having a movable contact and a plurality of switching contacts whose connections can be switched by the movable contact. The multi-stage switching control unit includes a plurality of fixed contacts each connected to the plurality of switching contacts, and a rotary plate that rotates in contact with the fixed contacts, and the rotary plate rotates according to the movement of the driving body. Two approximately semicircular conductive parts are formed on the surface that is relatively rotated and comes into contact with the plurality of fixed contacts, and a motor drive relay is connected to each conductive part, and each The movable contacts of the relay are inserted into the motor drive circuit, and these contacts are short-circuited when both of the two relays are de-energized, and cause the motor to rotate in the normal direction when one of the relays is energized. Further, the motor is connected to a power supply circuit so as to cause the motor to reverse when the other is energized, and the movable contact of the operating switch is connected to one of the fixed contacts. energizes the relay connected to any conductive part that contacts the fixed contact, thereby causing the motor to rotate forward or reverse, and the rotation of the rotary plate accompanying the rotation of the motor causes the fixed contact to become conductive. The rotation of the motor is stopped when the contact with the part is removed, and a diode for preventing backflow is inserted between the fixed contact of each of the drive parts and the switching contact of the operation part. Features.

By doing this, it is possible to adjust the irradiation angle of the pair of left and right headlights in multiple stages with only a small number of parts, and it is possible to perform stable adjustment operations, as well as with a single operation part. It is possible to provide a novel vehicular headlamp illumination angle adjustment device that can tilt left and right headlights simultaneously.

Embodiments Hereinafter, details of the irradiation angle adjustment device for a vehicle headlamp according to the present invention will be described with reference to embodiments shown in the accompanying drawings.

FIG. 1 is an explanatory diagram showing the entire irradiation angle adjustment device for a vehicle headlamp according to the present invention.
2', an operating section 3, and a power source 4.
In addition, the headlight and drive unit are 1, 1', and 1' on the left and right, respectively.
2 and 2' are provided, but since they are almost the same, only one of them will be explained.

The headlamp 1 is held by a headlamp holding member 5, and a support piece 6 provided at the upper part of the holding member 5 is rotatably attached to the vehicle body.
a is connected to the tip of the drive body 7 of the drive unit 2. The drive unit 2 is fixed to the vehicle body near the headlight 1, and includes a drive body 7 that is movable relative to the vehicle body, and when the drive body 7 is displaced relative to the vehicle body, the drive unit 2 is fixed to the vehicle body. The connection point with the headlight 1 is displaced relative to the vehicle body, and the inclination of the headlight 1 relative to the vehicle body is accordingly changed. The operating section 3 includes a multi-stage changeover switch 8 that determines the angle of inclination of the headlamp 1 with respect to the vehicle body.

FIG. 2 shows a control circuit of the irradiation angle adjusting device for a vehicle headlamp according to the present invention, and will be explained in more detail using this diagram. Reference numeral 9 denotes a DC motor included in the drive section 2, and the motor 9 causes the drive body 7 to be displaced with respect to the vehicle body. Reference numeral 10 denotes a multi-stage switching control section, in which a shaft 1 is rotationally driven by a drive section 2.
1 fixed rotating plate 12 and a large number of fixed contacts 13
It consists of A, 13B,..., 13E. Rotating plate 12
is approximately disk-shaped, and is rotated clockwise and counterclockwise by rotation of the shaft 11. The fixed contacts 13A, 13B,..., 13E are attached to appropriate mounting members, and the rotating plate 12
exist as a mutually fixed group in relation to
The relative positional relationship between the group of contacts 13A, 13B, . Rotating plate 1
There are two conductive parts 14 and 15 on the side that comes into contact with the two contacts 13A, 13B, ..., 13E (the parts shown in the satin pattern in the drawing, and the same applies to the other drawings). is formed. The conductive portions 14 and 15 are approximately semicircular belt-shaped, which are formed by removing approximately 180 degrees different portions of the circular conductive region, and the removed portions serve as insulating portions 16 and 17. In addition, fixed contacts 13A, 1
3B, . . . , 13E are arranged at appropriate intervals on the rotation locus of the conductive parts 14 and 15, and are arranged on the rotation locus within a center angle of approximately 180 degrees. Such fixed contacts 13A, 13B,
Although the arrangement of the fixed contacts 13A, 13B, ..., 13E is not generally defined or restricted to the above-mentioned range, at least one contact among the fixed contacts 13A, 13B, ..., 13E is connected to one of the two insulating parts 16 or 17. The arrangement is such that when one contact is made, all other contacts are in contact with the conductive part 14 or 15.

18 and 19 are connection terminals arranged on the rotation locus of the conductive parts 14 and 15, and the fixed contacts 13
A, 13B, .
9 is kept in contact with the other conductive part 15 at all times. The connection terminals 18 and 19 are connected to motor drive relays 20 and 21, respectively. The relay 20 is a forward rotation relay,
One connection terminal 18 is connected to one terminal of the excitation coil of the forward rotation relay 20, and the relay 21 is a reverse rotation relay, and the other connection terminal 1
9 is connected to one terminal of the excitation coil of the reversing relay 21. Note that the other terminal of the excitation coil of each relay 20 and 21 is grounded.

22 is a motor drive circuit including the motor 9 described above, and relays 20 and 21 are the motor drive circuit 2.
It is inserted in 2. 23 is a movable contact of the relay 20, which is connected to the common terminal CT ₁ connected to the normal rotation side input terminal 24 of the motor 9;
When the relay 20 is de-energized, it is in contact with the ground side terminal BT ₁ , but when the relay 20 is energized, it is in contact with the power supply side terminal MT ₁ . Also, 25 is relay 2
1 movable contact, connected to the common terminal CT ₂ connected to the reverse input terminal 26 of the motor 9, and when the relay 21 is de-energized, the ground terminal
Although it is in contact with BT ₂ , when the relay 21 is energized, it is in contact with the power supply side terminal MT ₂ . and,
The earth terminals BT ₁ and BT ₂ are both grounded, and the power supply terminals MT ₁ and MT ₂ are connected to the positive terminal 27 of the power supply 4, respectively. When the relay 20 is energized, its movable contact 23 is brought into contact with the power supply side terminal MT ₁ , thereby connecting the normal rotation side input terminal 24 of the motor 9 to the positive side terminal 27 of the power supply 4 . When the relay 21 is energized, its movable contact 25 is brought into contact with the power supply side terminal MT ₂ , so that the motor 9 is connected to the reverse side input terminal 26. power supply 4
The motor 9 is connected to the positive terminal 27 of the motor 9 and is driven to rotate in the reverse direction. And relay 20,2
When 1 is de-energized, both terminals 24 and 26 of motor 9
is shorted.

8 is a multi-stage changeover switch included in the operation unit 3, and the changeover switch 8 is connected to the positive side terminal 27 of the power supply 4.
A movable contact 29 having a common terminal 28 connected to
and a large number of switching contacts 30A, 30B, whose connection to the common terminal 28 can be switched by the movable contact 29.
..., 30E. And switching contact 3
0A, 30B,..., 30E are the fixed contacts 1 mentioned above.
3A, 13B, . . . , 13E are each connected to those having the same additional code. Da, Db,…,
De is these fixed contacts 13a, 13b,..., 13
This is a diode for preventing backflow inserted between the switching contacts 30a, 30b, . . . , 30e.

As mentioned above, the rotary plate 12 is rotated as the motor 9 of the drive unit 2 is driven to rotate, and in the illustrated embodiment, the rotating plate 12 is rotated in the direction in which the relay 20 is energized. When the motor 9 is rotated in the normal rotation direction, it is rotated counterclockwise, that is, in the direction shown by the solid line arrow in the figure, and the relay 21 is energized, so that the motor 9 When it is rotated in the reverse direction, it is rotated clockwise, that is, in the direction shown by the broken line arrow in the figure. When the motor 9 is rotated in the forward rotation direction, the headlight 1 is tilted in the direction shown by the solid line arrow in the figure, that is, in the upward direction, and when the motor 9 is rotated in the reverse direction In the figure, the headlight 1 is tilted in the direction indicated by the dashed arrow in the figure, that is, in the downward direction.

Therefore, the switching contact 30A of the switching switch 8,
Select any one of 30B,..., 30E as desired and connect the movable contact 29 to it.
The current from the power source 4 is transferred from the common terminal 28 to the movable contact 29
The current flows through the path of → switching contact 30 → fixed contact 13, and is further connected to one of the conductive parts 14 or 15 that is in contact with the fixed contact 13 connected to the switching contact 30 selected by the movable contact 29. from relay 2 through either connection terminal 18 or 19.
0 or 21. When either one of the relays 20 or 21 is energized, its coil is excited, thereby causing the movable contact 23 or 25 of the relay 20 or 21 to contact the power supply side terminal MT ₁ or MT ₂ , The motor 9 is rotated forward or reverse. When the motor 9 is rotationally driven, the driving body 7 is moved relative to the vehicle body, thereby tilting the headlamp 1 upward or downward, and rotating the rotating plate 12. . When the rotary plate 12 is rotated and its insulating part 16 or 17 is brought into contact with said selected fixed contact 13, i.e. when said fixed contact 13 leaves contact with the conductive part 14 or 15, it is energized. The movable contact 23 or 25 of the relay 20 or 21 is connected to the ground terminal BT ₁ and the terminal BT ₂ of the motor 9.
and 25 are short-circuited, the motor 9 is braked to stop its rotation, the rotation of the rotating plate 12 is stopped, and the movement of the drive body 7 is also stopped. This causes the headlamp 1 to stop tilting.

3 to 5 show an example of a specific mechanism of the drive unit 2, and the mechanism shown in FIGS. 3 to 5 will be described below.

A DC motor 9 with a speed reducer 32 is mounted on the upper side of the casing 31 which is divided into two parts, and a feed screw 33 is rotatably supported on the lower side of the casing 31. It is connected to the output shaft 34 of the reducer 32, and
A movable element 35 is screwed onto the feed screw 33, and the movable element 35 is formed such that protrusions 36 and 37 protruding from both sides extend along the axial direction of the feed screw 33 on the inner wall of the casing 31. The feed screw 33 is slidably engaged with the grooves 38 and 39, thereby being held in the casing 31 so as to be slidable along the axial direction of the feed screw 33. Reference numeral 40 designates an operation lever for tilting the headlight, which is approximately L-shaped.
5, and the intermediate bent base is pivotally attached to the opening of the casing 31 by a pin 43. Further, a driver 7 is rotatably connected to the tip of the bent portion 44 of the lever 40 that protrudes outside the casing 31.
A spherical portion 45 at the tip of the headlamp holding member 5 is fitted into a spherical recess 46 provided on the back surface of the lower portion 5a of the headlamp holding member 5. 47 is a gear fixed to the base of the feed screw 33, and a reduction unit 48 consisting of a plurality of gears (not shown)
The rotation of the output shaft 34 of the reducer 32 is transmitted to the gear 47,
The signal is transmitted to the deceleration section 48 via the transmission line 50. 11 is the output shaft of the reduction unit 48 and the rotary plate 1
2, and its tip is connected to the bottom wall 51 of the reduction unit 48 of the casing 31 and the bottom wall 51
The rotary plate 12 is fixed to the fixed contact mounting plate 52 provided at a certain distance below the fixed contact mounting plate 52 . The fixed contact mounting plate 52 has a large number of holes 53, 5.
3,... are formed, and these holes 53, 53,
..., the fixed contacts 13A, 13B, ..., 13E and the connection terminals 18, 19 are attached to the mounting plate 52.
are inserted in a state in which they protrude downward from the lower surface of the rotary plate 12, and each tip end is in contact with the surface of the rotary plate 12 on the side facing the mounting plate 52. And each fixed contact 13
A, 13B,..., 13E and connection terminals 18, 19
are formed with flanges 54, 54,...
Coil springs 55, 55, . . . , one end of which is in contact with the lower surface of the bottom wall 51 of the casing 31, are resiliently abutted on each flange 54, 54, . . . , the fixed contacts 13A, 13B, . Incidentally, connection terminals 56, 56, ... are protruded from the flanges 54, 54, ... of the fixed contacts 13A, 13B, ..., 13E and the connection terminals 18, 19, respectively, and the fixed contacts 13A, 13B, ... , 13E are the switching contacts 30A, 30B,..., 30E of the switching switch 8 of the operating section 3 provided near the driver's seat, respectively, and the aforementioned backflow prevention diodes Da, Db,..., De. The connection terminals 56 and 56 of the connection terminals 18 and 19 are connected to the coils of the relays 20 and 21.

Therefore, in the drive section having the above configuration, when the motor 9 is rotated, the rotation is transmitted to the feed screw 33 via the reducer 32, and further, the rotation is transmitted to the feed screw 33 via the reducer 32.
3, the movable element 35 moves along the axial direction of the feed screw 33 and moves the operating lever 40 to the pin 43.
Rotate around the center. Further, this rotational force moves the driving body 7 in the front-back direction, thereby tilting the headlamp 1. And feed screw 3
3 is rotated, the rotation is decelerated by the speed reducer 48 via the gears 47 and 50, and is transmitted to the rotary plate drive shaft 11, whereby the rotary plate 12
is rotated. Therefore, the fixed contact 1 connected to the switching contact 30 selected by the switching switch 8
When the rotating plate 12 is rotated to a position where the rotating plate 3 contacts the insulating portion 16 or 17 of the liver turning plate 12, the motor drive circuit 22 is short-circuited, and the motor 9 is stopped.

Next, the operation of adjusting the irradiation angle of the headlamp 1 by operating the operation switch 8 will be described in more detail using a specific example with reference to FIG.

First, from the state shown in FIG.
, the case where the switching contact 30C is selected and the movable contact 29 is connected to it will be explained. When the movable contact 29 of the changeover switch 8 and the changeover contact 30C are connected, the fixed contact 13C is connected to the power source 4 via the changeover switch 8. Since the fixed contact 13C is currently in contact with one of the conductive parts 14, the current from the power source 4 flows through the movable contact 29 of the changeover switch 8 → the changeover contact 30C → the fixed contact 13C → the conductive part 14 → the connection terminal 18 → the relay 20. Flow from coil to ground.
As a result, the relay 20 is energized and its movable contact 23 is connected to the power supply side terminal MT ₁ .
The current from the power source 4 also flows through the motor drive circuit 22 from the movable contact 23 of the relay 20 to the motor 9 to the movable contact 25 of the relay 21 to ground, and the motor 9 is rotated in the normal direction. When the motor 9 rotates forward, the drive body 7
is moved in the direction shown by arrow A in FIG. 3, and thereby the headlamp 1 is rotated in the direction shown by the solid line arrow in FIG. Along with this, the rotating plate 1
2 is rotated counterclockwise, the conductive part 14 first leaves contact with the fixed contact 13B, then leaves the contact with the fixed contact 13C, and the conductive part 14 leaves the contact with the fixed contact 13C.
C comes into contact with the insulating part 17 and the conductive part 14
and 15 (the state shown in FIG. 6A). When the fixed contact 13C is brought into contact with the insulating part 17, the movable contacts 23 and 25 of the relays 20 and 21 are connected to the ground side terminals BT ₁ and 25.
Connected to BT ₂ , the two terminals 24, 2 of the motor 9
6 is short-circuited, the rotation of the motor 9 is stopped, and the rotation of the rotary plate 12 and the movement of the drive body 7 are also stopped. Therefore, the direction of the headlight 1 is determined by the tilt angle at the time when the movement of the driver 7 is stopped.

Next, from the state shown in FIG. 6A, selector switch 8
A case will be described in which the switching contact 30B is selected and the movable contact 29 is connected to it. When the movable contact 29 of the changeover switch 8 and the changeover contact 30B are connected, the fixed contact 13B is connected to the power source 4 via the changeover switch 8. Since the fixed contact 13B is currently in contact with the other conductive part 15, the current from the power source 4 is transferred to the movable contact 2 of the changeover switch 8.
9 → switching contact 30B → fixed contact 13B → conductive part 1
5 → connection terminal 19 → coil of relay 21 → ground. As a result, movable contact 2 of relay 21
5 is connected to the power supply terminal MT ₂ , and the current from the power supply 4 is connected to the movable contact 2 for the motor drive circuit 22.
5→motor 9→movable contact 23→ground, and the motor 9 is rotated in the reverse direction. When the motor 9 is reversed, the drive body 7 is moved in the opposite direction of arrow A in FIG. 3, thereby causing the headlamp 1 to move in the direction indicated by the dashed arrow in FIG. It is being rotated by. At the same time, the rotary plate 12 is rotated clockwise, and the conductive part 15 leaves contact with the fixed contact 13B, and the fixed contact 13B comes into contact with the insulating part 17.
(the state shown in FIG. 6B) so that it is not in contact with any of the above. The fixed contact 13B is the insulating part 17
When contacted, the circuit through which current flows to the relay 21 is opened, so the movable contacts 23 and 25 of the relays 20 and 21 are both connected to the connection terminals BT ₁ and BT ₂ , and the connection between the terminals 24 and 26 of the motor 9 is shorted,
The rotation of the motor 9 is stopped, and the rotation of the rotating plate 12 and the movement of the driving body 7 are also stopped. Therefore, the direction of the headlamp 1 is determined by the tilt angle at the time when the movement of the driver 7 is stopped.

A drive section 2' that is completely similar to the drive section 2 described above is provided for the other headlamp 1'.
Moreover, the multi-stage switching control section 1 in this drive section 2'
0' fixed contacts 13'A, 13'B, ..., 13'E are switching contacts 30 of the switching switch 8 in the operation section 3.
A, 30B,..., 30E with the same numerals and backflow prevention diodes D'a, D'b,...,
Connected via D′e. In addition, such diodes Da, Db, ..., De and D′a, D′b, ...,
By inserting D'e, there may be a difference in the characteristics of the motors 9, 9' during use, or the tilting of either the headlights 1, 1' may be obstructed by foreign objects. When a phase shift occurs between the rotating plates 12 and 12' for some reason, each relay 20, 21, 2 in one drive unit 2 or 2'
0' and 21' are connected to the other drive unit 2' or 2.
It is possible to avoid the situation where the configuration is configured via .

Note that the configuration of the drive unit 2' is the same as that of the drive unit 2, so the same parts as in the drive unit 2 are designated with the same symbols as those used for the drive unit 2.
The explanation will be omitted by attaching the numeral with .

Reference numeral 57 denotes a display unit, which includes display bulbs 58A, the number of which corresponds to the number of stop positions of the headlights 1, 1'.
58B,..., 58E are provided, and,
Each indicator light bulb 58A, 58B, . . . , 58E is inserted between the switching terminals 30A, 30B, . Therefore, when any switching terminal 30 is selected, the display light bulb 5 corresponding to the switching terminal 30 is selected.
8 is closed and the indicator light bulb 58 is lit, thereby indicating the current position of the headlights 1, 1'.

FIG. 7 shows another embodiment of the rotary plate, in which the stability of operation is further improved by directly connecting the conductive part and the motor drive relay. Rotating plate 12A shown in this embodiment
The same parts as in the rotary plate shown in the above-mentioned embodiment will be denoted by the same reference numerals as in the above-described embodiment, and a detailed explanation will be omitted.

14A and 15A are terminal conductive parts formed by partially extending each conductive area from the center of each conductive part 14 and 15 toward the periphery of the rotary plate 12, and the terminal conductive parts 14A and 15A have terminal conductive parts, respectively. Connection terminals 59 and 60 are provided.
One ends of coil springs 61 and 62 made of a conductive material are connected to the connection terminals 59 and 60, and the other ends of the coil springs 61 and 62 are connected to an appropriate inner wall of the casing 31 of the drive unit 2. and relay 2 respectively.
It is connected to the excitation coils 0 and 21. When the rotary plate 12A is rotated, one end of each coil spring 61, 62 is moved following the rotation of the rotary plate 12A, and the coil springs 61 and 62 are expanded. Then, when the rotation of the rotating plate 12A is stopped, the moving operation and the extending operation of one end of the coil springs 61 and 62 are stopped at that position. Therefore, the current flowing through each conductive part 14 and 15 flows from each terminal conductive part 14A and 15A to each connection terminal 59 and 60.
The current flows through the coil springs 61 and 62 to the excitation coils of the relays 20 and 21.

According to the connection means of the rotary plate 12A, each of the conductive parts 14 and 15, and the relays 20 and 21, the rotary plate 12A is connected to the multi-stage switching control unit 10 selected by the inertia of rotation of the motor 9, etc. The tensile force of the coil springs 61 and 62 can apply a brake to prevent further rotation past the contact stop position between the fixed contact 13 and the insulating part 16 or 17. The tilting movement of the headlight 1 does not overrun, and there is no possibility that the headlight 1 will perform a hunting operation due to both the conductive parts 14 and 15 alternately contacting the selected fixed contact 13. Therefore, stable irradiation angle adjustment operation can be performed.

FIG. 8 shows a modification that can warn of the occurrence of an abnormal situation.

63 is a light emitting diode, and the changeover switch 8
is inserted between the common terminal 28 and the power supply 4.

However, if either of the headlights 1 or 1' does not tilt due to some external cause despite operating the changeover switch 8, the light emitting diode 63 will continue to light up. This allows the operator to know that an abnormality has occurred.

Incidentally, when such a warning means is provided, the above-mentioned display section 57 is not provided.

Effects of the Invention As is clear from the above description, the irradiation angle adjustment device for vehicle headlights of the present invention comprises a pair of left and right headlights that are tiltably held with respect to the vehicle body, and It is equipped with a driving part provided corresponding to the headlight and tilting the headlamp, and one operation part that operates the pair of driving parts, and each of the driving parts has a motor and a motor that controls the vehicle body. The driving body is moved in position and connected to a part of the headlamp, and a multi-stage switching control section, and the operation section is provided with a movable contact and a plurality of switching contacts whose connections can be switched by the movable contact. The multi-stage switching control unit includes a plurality of fixed contacts connected to the plurality of switching contacts, and a rotary plate that rotates in contact with the fixed contacts, and the rotary plate rotates when the driving body moves. Two approximately semicircular conductive parts are formed on the surface that rotates relatively according to the rotational speed and comes into contact with the plurality of fixed contacts, and a motor drive relay is connected to each conductive part. , the movable contacts of each relay are inserted into the motor drive circuit, and these contacts are short-circuited when both relays are de-energized, and rotate the motor in the normal direction when one of the relays is energized. The motor is connected to the power supply circuit so as to cause the motor to rotate in reverse direction when the other is excited, and the movable contact of the operating switch is connected to one of the fixed contacts. By energizing a relay connected to any conductive part that comes into contact with the fixed contact, the motor is rotated forward or reverse, and the fixed contact is rotated by the rotation of the rotary plate accompanying the rotation of the motor. The rotation of the motor is stopped when the contact with the conductive part is removed, and diodes for backflow prevention are inserted between the fixed contacts of each of the drive parts and the switching contacts of the operation part. It is characterized by

Therefore, according to the present invention, the command control of the tilting operation of the pair of left and right headlights and the control of the amount of operation thereof can be performed by one multistage control member of one operating section. In addition, it is possible to simultaneously tilt the left and right headlights with one operation unit, and it is also possible to avoid the situation where one drive unit is connected via the other drive unit, so the control circuit Furthermore, it is possible to provide a vehicular headlamp illumination angle adjustment device that has a simple control mechanism, has few failures, and can be constructed at a low cost.

In the description of the above embodiment, one headlight is shown on each side of the left and right sides, but the present invention can also be applied to cases where four or more headlights are used, such as two on each side of the left and right sides. Of course,
The key idea is that no matter how many headlights there are on each side, there is one set on each side, and there is a pair on each side. Further, in the above embodiment, a common power source is provided for the relay circuit and the motor circuit, but it is also possible to distinguish between the two and provide a separate power source for the motor circuit.

[Brief explanation of drawings]

The drawings show an example of the implementation of the irradiation angle adjustment device for a vehicle headlamp according to the present invention. Fig. 1 shows the overall concept, Fig. 2 shows the overall circuit diagram, and Fig. 3 shows the driving section. 4 is a cross-sectional view taken along line A-A in FIG. 3, FIG. 5 is an enlarged perspective view of the fixed contact group and the rotating plate, and FIGS. 6 A and B are views of the rotating plate. FIG. 7 is a plan view of the main parts showing an example of the operation, FIG. 7 is a perspective view of the main parts showing another embodiment of the rotating plate, and FIG. 8 is a diagram of the main parts showing a modification of the circuit. Explanation of symbols, 1, 1'...Headlight, 2, 2'...
Drive section, 3... Operation section, 4... Power supply, 7, 7'...
...Driver, 8...Operation switch, 9,9'...Motor, 10,10'...Multi-stage switching control section, 12,
12'... Rotating plate, 13A-13E, 13'A-1
3'E...Fixed contact, 14, 14', 15, 15'
...Conductive part, 29...Movable contact of operation switch,
30A to 30E...operation switch switching contacts,
Da～De... Diode for backflow prevention.

Claims (1)

[Claims] 1 A pair of left and right headlights held so as to be tiltable with respect to the vehicle body, a drive unit provided corresponding to each of the left and right headlights to tilt the headlights, and 1 for operating the pair of drive units. Each of the driving parts includes a motor and a driving body that is moved relative to the vehicle body by the motor and is connected to a part of the headlamp, and a multi-stage switching control part, The part includes an operation switch equipped with a movable contact and a plurality of switching contacts whose connections can be switched by the movable contact,
The multi-stage switching control unit includes a plurality of fixed contacts each connected to the plurality of switching contacts, and a rotating plate that rotates in contact with the fixed contacts, and the rotating plate rotates relative to the plurality of switching contacts according to the movement of the driving body. Two approximately semicircular conductive parts are formed on the surface that is rotated and comes into contact with the plurality of fixed contacts, and a motor drive relay is connected to each conductive part, and each relay is movable. The contacts are inserted into the motor drive circuit,
and these contacts are short-circuited when both of the two relays are de-energized, so that when one of the relays is energized, the motor is rotated in the forward direction, and when the other relay is energized, the motor is rotated in the reverse direction. The motor is connected to the power supply circuit as shown in FIG. Energizes the connected relay, thereby causing the motor to rotate forward or reverse, and stops the rotation of the motor when the fixed contact and the conductive part come out of contact due to the rotation of the rotary plate as the motor rotates. An illumination angle adjustment device for a vehicle headlamp, characterized in that a diode for preventing backflow is inserted between the fixed contact of each of the driving parts and the switching contact of the operating part.