JPH0524473A - Illuminating angle adjusting device for vehicular headlamp - Google Patents

Abstract

PURPOSE:To suppress engine room noise transmitted to the vehicle indoor side by making a wiring passing hole from the vehicle outdoor side to the vehicle indoor side small as well as to make wiring distribution work easy by simplifying a waterproof measure against rainwater and so on. CONSTITUTION:By switching a connecting position of an operation switch 42 to a set voltage taking out resistance 41 whose one edge is opened and other edge is earthed, partial pressure voltage having a different value is generated in a signal/electric power supply shared terminal 5a of a driving unit 5 as set voltage. Under such a constitution, a set voltage taking out circuit 4 and the driving unit 5 are connected together by means of a single connecting line L.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle front suitable for use in adjusting the irradiation angle of a headlamp held in a tiltable manner with respect to a vehicle body in multiple stages from a driver's seat side by remote control. The present invention relates to an irradiation angle adjusting device for a lamp.

[0002]

2. Description of the Related Art In a vehicle, particularly an automobile, a large load is applied to the front wheel side or the rear wheel side of the vehicle body because the vehicle body and the axle are connected by a suspension device including a leaf spring, a coil spring and the like. , The body posture is in the state of front sinking or rear sinking, which changes the vertical irradiation angle of the headlight with respect to the road surface and impairs driving safety. If this happens, there is a danger that the driver of the oncoming vehicle will be significantly dazzled. In order to correct such a change in the irradiation angle of the headlight with respect to the road surface, the headlight is held tiltably with respect to the vehicle body, and the irradiation angle of the headlight is remotely controlled from the driver side. A device configured to be adjustable by means of Japanese Patent Laid-Open No. 61-46
No. 733 is disclosed. FIG. 4 shows this JP-A-61-
It is a figure which shows the operation principle of the irradiation angle adjusting device disclosed by 46733 publication, and the operation switch 1 arrange | positioned at the driver's seat side.
By switching the connection mode of No. 3, the irradiation angle of the headlight (not shown) held so as to be tiltable with respect to the vehicle body is to be adjusted. That is, when the connection mode of the operation switch 1 is switched from the state shown in the drawing, and, for example, the common terminal 1-0 and the switching terminal 1-5 thereof are connected, the sliding contact 2 is connected to the relay coil RL1 of the drive unit 2.
A current flows in the path of 1a-the conductor pattern 22-the sliding contact 21d, and the normally open / normally closed contact rl1 of this relay coil RL1.
The common terminal rl1c and the normally-open contact terminal rl1a become conductive. The common terminal rl1 of this normally open / normally closed contact rl1
Due to conduction between c and its normally open contact terminal r11a, a current flows in the direction A in the DC motor 24, and the motor 24 rotates forward to rotate the lamp drive shaft 25 clockwise in the figure. When the lamp drive shaft 25 rotates to the right, the irradiation angle of the headlight moves upward, and the sliding substrate 26 having the conductor patterns 22 and 23 formed on the upper surface thereof rotates to the right, so that the sliding contact 21d becomes the conductor. When separated from the pattern 22, the energization of the relay coil RL1 is released, and its normally open / normally closed contact r
The common terminal rl1c of l1 and the normally-open contact terminal rl1a become non-conductive, the power supply to the DC motor 24 is cut off, and the irradiation angle of the headlamp is fixed at a predetermined position in the upward direction. When the connection mode of the operation switch 1 is changed from this state to the original state, that is, the common terminal 1-0
And the switching terminals 1-4 are connected, a current flows through the relay coil RL2 of the drive unit 2 through the sliding contact 21i-conductor pattern 23-sliding contact 21e path, and the relay coil RL2 is normally open. Common terminal r of normally closed contact r12
l2c and the normally open contact terminal rl2a are brought into conduction with each other, and a current flows in the direction B in the figure to the DC motor 24 so that the motor 24
Rotates in reverse, the lamp drive shaft 25 rotates counterclockwise, and the irradiation angle of the headlight moves downward. That is, as can be seen from the above description, by switching the connection mode of the operation switch 1 to the switching terminals 1-1 to 1-7, it is possible to remotely adjust the irradiation angle in seven stages in the vertical direction.

[0003]

However, according to such an irradiation angle adjusting device, there is a problem that the number of connecting lines between the operation switch and the driving unit increases as the number of adjusting the irradiation angle increases. That is, FIG.
In the case of the irradiation angle adjusting device shown in (1), seven connection lines L1 to L7 are required between the operation switch 1 and the drive unit 2 in order to adjust the irradiation angle in seven steps.
Holes (wiring holes) through which the connection lines L1 to L7 pass because the drive unit 2 is attached to the headlight and arranged in front of the vehicle.
Must be largely opened in the partition between the engine room (outside the car) and the driver's seat side (inside the car). That is, if the number of connecting lines between the operation switch and the drive unit increases,
Since the wiring through-holes formed in the partition section become larger by that amount, there arises a problem that the noise in the engine room introduced into the vehicle through the wiring through-holes increases. In addition, due to the increase in the number of connecting lines between the operation switch and the drive unit, waterproof measures against rainwater and the like that are guided to the inside of the vehicle through the above connecting lines from the headlamps arranged outside the vehicle (for example, (Each one passes through a small-diameter bushing that is opened in a large-diameter bushing.)
In addition, there is a problem that the wiring work is difficult.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and by changing the connection position of a resistance means having one end open and the other end grounded, different values can be obtained. The divided voltage is taken out as the set voltage, and the divided voltage taken out from the reference resistance means formed by applying the power supply voltage across the set voltage is set as the reference voltage, and this reference voltage is compared with the set voltage. Based on the comparison result of the reference voltage and the set voltage, an output signal corresponding to the comparison result is generated, and the irradiation angle of the headlight in the vehicle is changed to a position determined according to the generated output signal. It was done.

[0005]

Therefore, according to the present invention, if the resistance means is arranged inside the vehicle and the set voltage taken out from the resistance means is derived to the outside of the vehicle, the number of connection lines drawn into the inside of the vehicle is set to the above-mentioned value. It is possible to use only one lead line for the voltage.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An irradiation angle adjusting device for a vehicle headlamp according to the present invention will be described in detail below.

FIG. 2 is a circuit diagram showing an embodiment of this irradiation angle adjusting apparatus. In the figure, 4 is a set voltage extracting circuit arranged on the driver's side, and 5 is a drive unit attached to a headlight (not shown) held so as to be tiltable with respect to the vehicle body.

The set voltage extracting circuit 4 is composed of a set voltage extracting resistor 41 formed by connecting resistors R1 to R5 in series, and a rotary operation switch 42. Then, one end of the resistor R1 (one end of the set voltage extracting resistor 41),
Connection point between resistors R1 and R2, connection point between resistors R2 and R3,
The connection point between the resistors R3 and R4, the connection point between the resistors R4 and R5, the other end of the resistor R5 (the other end of the set voltage extraction resistor 41)
However, the switching terminals 42-1, 42-2, 42- of the operation switch 42
Connected to 3,42-4, 42-5, 42-6,
The common terminal 42-0 of the operation switch 42 is connected to the signal / power common terminal 5a of the drive unit 5 via the output end 4a. One end of the set voltage extracting resistor 41 is open and the other end is grounded (body ground).

That is, by switching the connection position of the operation switch 42 with respect to the set voltage extracting resistor 41 whose one end is open and the other end is grounded, the divided voltage having different values is driven as the set voltage as described later. It occurs at the signal / power common terminal 5a of the unit 5. In addition,
The set voltage extracting resistor 41 may be configured as shown in FIG.

On the other hand, the drive unit 5 is a hybrid I
C (hereinafter abbreviated as HIC) 51, irradiation angle variable circuit 5
2, a diode D1, a resistor R6, a capacitor C1 and a zener diode ZD. Drive unit 5
In the signal / power supply common terminal 5a,
Connected to the terminal 51-1. Terminal 51 of HIC51
A power supply voltage defined by the Zener diode ZD is applied to -2, and a voltage from the vehicle battery 3 is directly applied to the terminal 51-3 via the diode D1. The terminal 51-4 of the HIC 51 is grounded (body ground), and the output signals generated at the terminals 51-5 to 51-10 are supplied to the irradiation angle variable circuit 52.

The irradiation angle variable circuit 52 has a sliding contact structure 52.
-1, a relay circuit section 52-2, a motor 52-3 and a PTC. The relay circuit section 52-2 includes relays RY1 and R
Y2 and the connection shown in the figure.

Next, the operation of the irradiation angle adjusting device constructed as described above will be described. Now, assuming that the operation switch 42 is in the connection mode 0 state, that is, the common terminal 42-0 and the switching terminal 42-1 are connected, the HIC 51 outputs the "L" level signal only to the terminal 51-5. Is output. From this state, the operation switch 42
When the connection mode is changed to, for example, the connection mode I, a divided voltage having a value different from that before is generated as the set voltage at the signal / power common terminal 5a. This allows
The HIC 51 sets the terminal position for outputting the “L” level to 51
Move from -5 to 51-6.

Then, the diode D1-relay coil R
Current flows through the path of y1-sliding contact structure 52-1-terminal 51-6, the common terminal ry1c of the relay coil Ry1 and the normally-open contact terminal ry1a are brought into conduction, and the motor 52-3 moves in the direction A in the drawing. An electric current flows. As a result, the motor 52
-3 rotates in the forward direction to move the irradiation direction of the headlight downward, changes the contact connection state in the sliding contact structure 52-1 and releases the energization of the relay coil Ry1. Then, the common terminal ry1c of the relay coil Ry1 and the normally open contact terminal ry
The power supply to the motor 52-3 is cut off by disconnecting from 1a, and the irradiation direction of the headlamp is fixed at a predetermined position in the downward direction (first stage position).

Similarly, if the connection mode of the operation switch 42 is changed to II, III, IV, and V, the divided voltages having different values are generated as the set voltage at the signal / power common terminal 5a one after another. , The terminal position for outputting the “L” level moves to 51-7, 51-8, 51-9, 51-10, and the irradiation direction of the headlight is downward direction II, III, IV, IV. V
It will be fixed in the step position.

On the other hand, if the connection mode of the operation switch 42 is set to IV while the irradiation direction of the headlight is fixed at the V-stage position, the terminal position for outputting the "L" level is 51-9. Move and diode D1-relay coil Ry
2-Sliding contact structure 52-1 -Current flows through the path of terminal 51-9, the common terminal ry2c of the relay coil Ry2 and the normally open contact terminal ry2a become conductive, and the motor 52-3 moves in the direction B shown in the drawing. An electric current flows. As a result, the motor 52-3 rotates in the reverse direction to move the irradiation direction of the headlamp upward, change the contact connection state in the sliding contact structure 52-1 and release the energization of the relay coil Ry2. Then, the common terminal ry2c of the relay coil Ry2 and the normally open contact terminal ry2a become non-conductive, and the power supply to the motor 52-3 is cut off.
The irradiation direction of the headlight is fixed at a predetermined position in the upward direction (position IV).

FIG. 1 shows a specific internal structure of the HIC 51, in which a terminal 51-1 is connected to a terminal 51-2 via a resistor R7. That is, the set voltage extracting resistor 41 is connected to the resistor R7.
The power supply voltage is applied via the control switch 42, and the divided voltage of different value generated at the connection point between the resistor R7 and the set voltage extracting resistor 41 is set as the set voltage V _IN according to the connection mode of the operation switch 42. , To the non-inverting input terminals of the comparators CPa-1 to CPa-6 in the voltage comparison circuit 512. The resistors R9 to R15 of the reference voltage setting resistor 511 are connected to the inverting input terminals of the comparators CPa-1 to CPa-6.
The divided voltages V1 to V6 generated at the respective connection points are given as reference voltages. Then, the outputs of the comparators CPa-1 to CPa-6 in the voltage comparison circuit 512 are signals (f).
(A) to (a) are given to the inverting input terminals of the comparators CPb-1 to CPb-6 in the output signal generation circuit 513. The reference voltage V4 is applied to the non-inverting input terminals of the comparators CPb-1 to CPb-6, and the comparator CPb-1.
The outputs of b-1 to CPb-6 are used as signals (g) to (l) to output the inverter INV-1 in the transistor array 513-1.
~ Given to INV-6. The outputs of the inverters INV-1 to INV-6 are connected to the terminals 51-5 to 51-10.

The following table is a truth table showing the level changes of the signals (a) to (l) with respect to each connection mode of the operation switch 42 in the irradiation angle adjusting device thus constructed.

[0018]

As is clear from the truth table, by appropriately changing the connection mode of the operation switch 42, the "H" level position of the signals (g) to (l) changes according to the connection mode, The irradiation angle of the headlight is variable via the sliding contact structure 52-1 to a position determined according to the "H" level position of the signals (g) to (l).

Here, paying attention to the connection relationship between the set voltage extracting circuit 4 and the drive unit 5, the set voltage extracting circuit 4 and the drive unit 5 are connected by one connection line L. Therefore, according to the irradiation angle adjusting apparatus of the present embodiment, the wiring through hole opened in the partition between the engine room and the driver's seat can be made much smaller than the conventional one, and the wiring through hole can be made smaller than the conventional one. It is possible to suppress noise in the engine room that is guided inward.
Further, it becomes easy to take a waterproof measure against rainwater or the like which is guided to the inside of the vehicle through the connection line from the headlamp arranged outside the vehicle, and the wiring work becomes easy.

In the above-described embodiment, the irradiation angle of the headlight is adjusted by manually operating the operation switch 42 in the set voltage extracting circuit 4, but, for example, a sensor from a tilt angle sensor is used. The connection mode of the operation switch 42 may be automatically switched in response to a signal to adjust the irradiation angle of the headlight.

Further, in the embodiment, the irradiation angle of the headlight in the vertical direction is adjusted, but it is also possible to apply it to the adjustment of the irradiation angle of the headlight in the horizontal direction. Not to mention.

[0023]

As is apparent from the above description, according to the present invention, the resistance means is arranged inside the vehicle, and the set voltage taken out from the resistance means is led to the outside of the vehicle. It is possible to connect only one of the above-mentioned set voltage derivation lines to the inside of the vehicle by making the wiring through hole from the outside of the vehicle to the inside of the vehicle much smaller than in the past. It becomes possible to suppress the noise in the engine room which is generated. In addition, a number of excellent effects such as simplification of waterproofing measures against rainwater and the like guided to the inner side of the vehicle from the headlights arranged outside the vehicle and guided to the inner side of the vehicle and facilitating wiring work therefor are exhibited.

[Brief description of drawings]

FIG. 1 is a diagram showing a specific internal configuration of a hybrid IC in the irradiation angle adjusting device shown in FIG.

FIG. 2 is a circuit configuration diagram showing an embodiment of an irradiation angle adjusting device for a vehicle headlamp according to the present invention.

FIG. 3 is a diagram showing another configuration example of a set voltage extracting resistance in this irradiation angle adjusting device.

FIG. 4 is a diagram showing an operation principle of a conventional irradiation angle adjusting device.

[Explanation of symbols] 4 set voltage extraction circuit 41 set voltage extraction resistance 42 operation switch 5 drive unit 51 HIC 52 irradiation angle variable circuit 511 reference voltage setting resistor 512 voltage comparison circuit 513 output signal generation circuit R7 resistance L connection line

Claims (1)

Claim: What is claimed is: 1. A set voltage extracting means for extracting a divided voltage having a different value as a set voltage by switching the connection position of a resistance means having one end opened and the other end grounded, Reference voltage setting means for setting as a reference voltage a divided voltage taken out from a reference resistance means having a power supply voltage applied to both ends, a reference voltage set by the reference voltage setting means, and a set voltage taken out by the set voltage extracting means. And a voltage comparison means for comparing the output signal generation means for generating an output signal according to the comparison result based on the comparison result in the voltage comparison means, and a position determined according to the output signal generated by the output signal generation means. An irradiation angle adjusting device for a vehicle headlight, comprising: an irradiation angle changing means for changing an irradiation angle of a headlight in a vehicle.