JPS5897535A - Light axis adjuster for car head light - Google Patents

Abstract

PURPOSE:To prevent the hunting of a drive motor by constituting such that at least one of two comparators for comparing between a light axis setting signal and a light axis detection signal will produce a detection signal only when the differential signal will exceed over the predetermined level. CONSTITUTION:In the first voltage comparator COM1, a light axis setting section VR1 and a light axis detecting section VR3 are connected directly while the second voltage comparator COM2 is connected through a resistor R2 to VR1 or VR3, where the first voltage comparator COM1 will receive the voltage applied on an inverted input terminal at the non-inverted input terminal while receive the other voltage at the inverted input terminal. Furthermore feedback circuits D1, D2 are connected between the input connected with a resistor R2 of COM2 and the output terminal, where the resistance of D1, D2 are made different when the voltage at the input terminal of COM2 is higher or lower than that at the output terminal.

Description

[Detailed Description of the Invention] The present invention is a vehicle headlamp. Regarding the I device, it is particularly important to rotate the optical axis of the headlamp in the forward and reverse directions to move the optical axis of the headlamp in the vertical direction. A new main shaft 111 of a vehicle headlamp that can be accurately oriented at the desired angle and operate stably without causing hunting or the like! It is intended to provide an I-device.

The original axis that adjusts the angle of the original axis of wheels, especially car headlights, vj4! ll1m! As an I device, find the difference between the output of the optical axis detection section that detects the angle of the optical axis of the headlight and the output of the optical axis setting section that sets the angle of the optical axis of the headlight by operating a knob etc. Some headlamps are designed to move the optical axis of the headlamp in the vertical direction using a drive motor that rotates forward or backward depending on the sign or negative of the difference. In such a device, when there is a difference between the output of the drive motor #'i original axis detection section and the output of the optical axis setting section, the motor is controlled to rotate in a direction such that the difference becomes 0. Therefore, when the magnitude of the output of the original axis setting section is changed, the optical axis of the headlight is moved by the drive motor so that the magnitude of the output of the optical axis detection section becomes the same magnitude, and the result of step 7 is obtained. The original axis attempts to take an angle corresponding to the magnitude of the output of the original axis setting section. However, in general, the drive motor that tries to direct the main axis of the headlamp at a set angle will rotate due to its inertia, etc., and then rotate in the opposite direction, causing the rotation to go too far. As a result of repeated operations, a hunting phenomenon occurs in which the headlights move up and down with a certain amplitude, resulting in unstable operation. Therefore, attempts have been made to stabilize the operation by stopping the drive motor when the absolute difference between the output of the optical axis setting section and the output of the optical axis detection section is within a certain range. . This lifting weight, IIA @ the absolute direct range of the difference between the above two outputs where the motor is stopped (stop area) / fi If the ring is too narrow, the effect of providing the stop area is not fully obtained On the other hand, if the stop area is too wide, even if it is possible to stabilize the operation, the angle of the optical axis of the headlight cannot be set accurately. become unable to control.

Therefore, it can be said that the width of the stop region should be set in accordance with the amount of rotation after the difference between the two outputs of the drive motor becomes 0 until the motor stops.

By the way, the amount of rotation due to the inertia of the drive motor that rotates in forward and reverse directions to move the base of the headlight in the vertical direction may vary depending on the direction of rotation of the sliding motor. For example, when the drive motor tries to tilt the headlight upward, the load applied to the drive motor becomes heavier by the moment due to the headlight's gravity.9
On the other hand, in a base shaft adjustment mechanism in which the load applied to the drive motor when the drive motor attempts to tilt the headlight to face downward is reduced by the moment due to the gravity of the headlight, the drive If the motor tilts the headlight upward, the amount of rotation of the drive motor due to inertia will be less than in IIK. In such a case, if the width of the above-mentioned stop area is set to a width corresponding to the amount of rotation due to the inertia of the drive motor when the drive motor tilts the headlight to face upward, the wheel will 1/The IA drive motor tilts the headlight toward the lower axis, which is too narrow for the IA@-, and the drive motor rotates too much, resulting in problems such as hunting, which makes the operation difficult. becomes extremely unstable.

On the other hand, if the drive motor tilts the headlights downward, if you set the width according to the amount of rotation due to the inertia of the drive motor, the setting will be too wide, causing the headlights to face upwards. When tilting, the angle of the original axis cannot be adjusted accurately.

Therefore, even if the amount of rotation due to the inertia of the drive motor that rotates forward and backward to move the headlight downwards varies depending on the direction of rotation, the original axis of the front light remains at the set angle. It aims to provide a rigid vehicle light beam that can be pointed accurately and operates stably without causing hunting or other problems. A base axis detection section that outputs an electrical signal of a magnitude corresponding to the angle of the base axis of the headlamp, that is, a base axis detection signal, and an electrical signal of a magnitude corresponding to the set amount of the set angle of the base axis of the headlight. The signal node includes a base axis setting section that outputs the jt axis setting signal, a second comparator that generates a detection signal when the tiI optical axis setting signal is larger than the base axis detection signal, and a base axis detection signal that is set to the light @ setting. a λ-th comparator that generates a detection signal t- when the signal is greater than the signal;
Depending on the polarity of the voltage applied to the terminal or the terminal to which the voltage is applied, the optical axis of the 5irs lamp is rotated forward or backward depending on the direction of the drive motor and the first and second comparators. - a motor switching circuit that generates a detection signal as long as the difference between the base shaft installation signal and the base shaft detection signal does not exceed a certain value. The invention is characterized in that an area is created in which the drive motor is stopped when the optical axis setting signal changes from large to small or from small to large, that is, a hunting prevention area is created. do.

The details of the optical axis adjustment device of the uninvented vehicle headlamp will be explained below according to the embodiment shown in the accompanying drawings.

Figure 7 shows the dynamics of the original 1118R adjustment mechanism used in the original axis adjustment device of the uninvented vehicle headlamp. The support member for /, 3 is a stay for maintaining the headlight /, and the seventh one is for the vehicle body.
is fixed. The headlight is a shaft fixed to the f1111 end of the stay 3, and the support member λ of the headlamp is supported on the shaft so that the upper end of the support member λ becomes the rudder.

M is a drive motor, which has a built-in fjfc motor, and a pinion 7 is fixed to its output -6. ♂ is a rack meshed with the pinion 7, and is arranged so as to be moved in the direction of the front edge of the vehicle body μ by the rotation of the output −6 of the drive motor M. A transmission shaft is integrally formed at the front end of the cedar rack, and a #'i ball IO is integrally formed at the front end of the transmission shaft. // is a receiving part fixed to the lower end of the support member λ of the headlamp /, and a spherical recess /, 2 that opens to the rear of ri is formed in the receiving part //. By fitting the ball 10 of the transmission@9sun into the spherical recess 2, the transmission shaft and the lower end of the support member of the headlamp are connected like a ball joint.

/ 3Vi′yt axis detection variable resistor, its main base /
3α is fixed to the vehicle body μ so as to face the J1 surface of the rack ♂ at an appropriate distance therefrom, and the movable member /3b is fixed to the back surface of the rack. Each terminal of this variable resistor 4S/3 is connected to a main shaft-to-plate circuit, which will be described later, via a wire.

Thus, when the IIA dynamic motor M is rotated in forward and reverse directions, the rank that meshes with the pinion 7 fixed to its output -6 is moved in the front-rear direction. Then, Binion 7
The lower end of the support member J of the headlamp / which is connected in a ball joint to the power transmission shaft of is moved back and forth, and the *lJ dark light / is rotated about the shaft j that supports the upper end of the support member λ. However, its original axis is moved in the vertical direction. Also, when the rack g moves, the movable element/3b of the variable resistor/3 moves accordingly, and the resistor of the variable resistor/3 changes, and the resistor becomes #light/
The size is equal to the angle of the original axis of . Ko more namoto @
B adjustment mechanisms are provided corresponding to the left and right headlights. Incidentally, the variable resistor/3 for optical @-view is provided only on the left optical axis *11 mechanism.

Figure 2 shows the drive motors ML and M that tilt the left and right headlights.
This figure shows an example of a circuit for adjusting the base axis of a headlamp by rotating R to adjust the angle of the base axis of a headlamp.

In the figure, the position of the mover S is moved according to the rotation of the knob VR/, and the oJ for setting the optical axis angle is moved.
The variable resistor VL2 is a variable resistor i (/3) for detecting the base axis shown in Fig. 1, and its -100 terminal is connected to the anode of the electric current 1jIll through the ignition switch 8W, and the corresponding The cathode of power source E is grounded. The other terminal of the variable resistor VR/ for setting the optical axis is grounded via the variable resistor VR3 for zero, and the other terminal of the variable resistor VR/ for optical axis detection is grounded via the variable resistor VR3 for zero.
The other terminal Fi of J (/3) is directly grounded. Therefore, when the ignition switch SW is turned on, a voltage is generated between the movable element S and the variable resistor VR/ and VR-2 and the ground. The magnitude of this voltage changes depending on the positions of movers S and D-, and
When the terminal 1 is moved to the terminal connected to the anode of the source E through the ignition SW, the voltage increases, and conversely, when the terminal 1 is moved toward the ground terminal -, the voltage at 7 becomes small.

Therefore, the voltage between the movable element B of the variable resistor VR/ for setting the optical axis and the ground, that is, the original axis setting voltage ■.

has a size corresponding to the amount of operation such as rotation of the knob, and the variable resistor VR2 (/31D) 36) and W
i! The O1L pressure, that is, the optical axis detection voltage v1, has a magnitude corresponding to the angle K of the optical axis of the headlamp. It is to be noted that this is for adjusting the optical axis setting voltage VD appropriately and directly when the operating amount of the zero variable resistor VR3W'i knob is 00.

00M/ and OOM, 2 are voltage comparators made of, for example, differential amplifiers, and are designed to compare the optical axis setting voltage vS and the optical axis detection voltage VD. The comparator 00M/Fi receives the optical axis setting voltage vs to the non-inverting input terminal, and the original axis detection voltage vD
is received at the inverting input terminal, and when VB>VD, the voltage is equal to voltage E. Output oM/.

R, is a positive feedback resistor connected between the output terminal and the non-inverting input terminal of the comparator 00M/, and this resistor R/ increases the comparator COM/ by more than the amplifier specific to the comparator. It will get bigger accordingly. Comparator 00M, 2 is optical axis detection voltage vD
is received at the non-inverting input terminal through the resistor R, the original axis setting voltage v8 is received at the inverting input terminal, and the resistor R is connected to the non-inverting input terminal.
A voltage V equal to the power supply voltage E when the voltage received through V2 is greater than the original axis setting voltage V8 directly received at the inverting input terminal. Outputs 0M2.

Diodes D/, D- and resistors R3, Rμ constitute a feedback circuit, and diode D/ij cand is the output terminal of voltage comparator 00MJ! The anode is connected to the resistor R
3 to the non-inverting input terminal of the ratio f ratio 00M. In addition, diode DJ has its V- terminal connected to the output terminal of voltage comparator 00M, 2, and its diode DJ connected to the non-inverting input terminal of comparator 00M, 2 via resistor Rμ, in contrast to diode D/. ing. Therefore, the voltage comparator 00M
When the potential of the output terminal of λ is lower than the potential of the non-inverting input terminal, that is, the voltage comparator 00M, ? to output voltage V. OM,
2 is not occurring, the diode DI is FAL and the diode D- is non-conductive, so the resistance of the feedback circuit at that time is the resistor R3 connected to the conductive diode D/. Also, when the potential of the output electrons of the voltage ratio & gain 00M2 is higher than the potential of the non-inverting input terminal, that is, the output voltage from the voltage comparator 00M,2 is ■. When OM,2 occurs, diode DJ becomes conductive, and diode D/
becomes non-conductive, so that the resistance R≠ connected to the diode D3 which is in the conductive state of resistor #'i of the feedback circuit at that time.

Output voltage v0゜M/ of voltage comparator 00M/ and 00M2
and V. oM and 2Fi are applied to the bases of transistors Q/ and Q through resistors Rr and Rat, respectively.

The emitters of transistors Q/ and Qλ are grounded, and R7 and RfFi are resistors connected between the paces of transistors Q/ and Q2, respectively, and ground. R
One end is connected to the collector of L/ and RL2/d transistor Q/ and Q,2, and the other end is connected to the ignition switch 8.
A relay connected to the anode of the electric @m through 1, D3,
Dv- is its protection diode. Then, the output voltage V from the voltage comparators 00M/ and C0M2. OM', 768
When M2 occurs, transistors Q/ and Q2 are turned on.

Then, a closed path is formed consisting of the power supply, ignition switch SW, relays RL/, RL, 2) run listers Q, /, Q, 2, current flows through relays RL/, RL-, and relays RL/, RL, 2) are formed. RL2 works. Relay R
The make contacts Ma of L/ and RL, 2 are electrically connected to mI[tK via the ignition switch SW, and the break contact B is grounded. The common terminal O of the relay RL/ is connected to two drive motors ML corresponding to the left and right headlights,
It is connected to one terminal X of each MR. Father, relay RL, 2 common terminals 0#'iλ two drive motors ML
, MR are connected to the other terminal Y of each. Therefore, both transistors Q/ and Q2 are in the off state 1,
When none of relays RL/, RL, and 2 are energized, drive motors ML and MRIZ) terminals X and Y are kept at ground potential, and conversely, transistors Q/ and Q- are both turned on. In this case, when relays RL/, RL, and 2 are all excited, the electric currents X and Y of the drive motors ML and MR are kept at the same potential as the anode of the electric current Oj Also, no voltage is applied between the WI4 terminals of the drive motors ML and MR, and the drive motor ML+%MR does not rotate. When the transistors Q and 2 are in the off state 1, the transistor Q/ is turned on, and as a result, the relay RL/ is energized. One terminal X of the Nanabatake motors ML and MR is the common terminal 0.
, meter contact Ma and ignition switch 8Wt-
It is connected to the anodes of w and am through. Therefore, the terminals X of the drive motors ML and MR are the terminals! When becomes negative, the first drive motors ML and MR#i rotate in the positive direction, for example. Further, when transistor Q/ remains off and transistor Q2 is turned on to energize relay RL2, drive motor ML,
The other terminal Y of MR is connected to the anode of the electric current gI]11 via the common terminal C1 make contact McL and the ignition switch 8W. Therefore, the terminals Y of the drive motors ML and MR become positive, and the terminals X of the drive motors ML and MR become negative9.
For example, rotates in the opposite direction. And llAt1b monitor ML
, MR rotates forward, for example (direction around the hour hand in Figure 1)
When the drive motors ML and MR are rotated in the opposite direction (counterclockwise in FIG. 1), the left and right headlights point downward.

The operation of this optical axis adjustment circuit will be explained below.

(1) When the base axis setting voltage vs and the base axis detection voltage VD are approximately equal. At this time, the output voltage of comparators 00M1 & 00M2 is V. OM' and vo. Since M, 2Fi is approximately O, both transistors Q/ and q2 remain off. Therefore, both relays RL/ and RLλ are not excited, and drive motors ML and MR do not rotate.

G2) ft, axis setting voltage v8 is higher than optical axis detection voltage V
When it is larger than D.

By operating the knob etc., move the movable element B of the variable resistor VR/ for setting the original axis to the ignition switch SV of the variable resistor VR/.
To! When the base axis setting voltage VB is moved closer to the I-connected trend, the base axis setting voltage VB becomes higher than the increased base axis detection voltage VD. Then, the first voltage comparison MiC! Output voltage V from OM/.

OM' occurs and transistor Q/ turns on.

As a result, the relay RL/ is energized, so its common terminal C is connected to the make contact Mα and the state motor ML%MR is connected to the make contact Mα.
The terminal X of is connected to the power supply IO anode. - The voltage ratio cOMλ of λ is the output voltage V since the voltage applied to the inverting input terminal is also larger than the voltage applied to the non-inverting input terminal.
OOM- is not generated, the tonjisume Q, 2d# is maintained in a flat state, and the relay RL2 is maintained in a state where MJJIiB is not generated. Therefore, the terminals Y of the drive motors ML, MR are kept grounded via the relay RL, the common electronic O of the two and the break contact B, so that the terminals Y of the drive motors ML,
MR rotates in the positive direction, and the mover of the variable resistor section for optical axis detection rotates (/3b) Vi variable resistor VR.
It is moved closer to the ignition switch connected to the second (/3) ignition SW, and the base shaft detection voltage VD increases. Then, when the base axis detection voltage VD is equal to or larger than the base axis setting voltage VB, the comparator CQM/ outputs the voltage ■. OM"' will not occur.

Then transistors Q and / turn off and relay RL
/ changes to the de-energized state and its common electron 0 is connected to break contact B. As a result of step 7, the state I is reached in which the electric voltage 1 is not applied to the drive motors ML and MR. However, even in this state, the IIA# motor MIJ%MR does not stop immediately and continues to rotate due to inertia, causing the headlight/upward tilt! l1ll is vJc, so the light-set voltage ■
8 continues to rise. Then, after that, the drive motors ML, M
Rotation of R stops.

By the way, like this, the voltage ratio of @, 2 * output voltage V from the device 00M2. If OM is not generated, that is, the potential of the output terminal of comparator 00M, 2 is at the ground level, a voltage comparator 00M/ and ■ input 1ilt'i of C are shown in Figure 3 (
The result will be as shown in Fig. In such a case, the resistor R3 becomes the resistor of the feedback circuit as described above, and is connected to the output terminal of the comparator 00Mλ, so that the potential of the terminal 7t- becomes the ground level. Then, a voltage dividing circuit that divides the original axis detection voltage VD is configured by the resistors R, 2 and R3 (note that the forward voltage of the diode DI and the voltage comparator 0
The terminal voltage and the like in a non-conducting state of a transistor (not shown) within 0Mλ are ignored. ). Therefore, comparator 00
A voltage vD' obtained by dividing the optical axis detection voltage '7Dt by the voltage dividing circuit described above is applied to the non-inverting input terminal of M2. Therefore, even if the photo-detection voltage vD becomes higher than the original axis setting voltage v8, the voltage comparison -00M continues until the voltage vD' applied to the non-inverting input terminal becomes larger than the original axis setting voltage v8.
, 2 does not generate the output voltage v0゜M=, and the drive motor ML
, MR's Y terminals are kept at am potential, and the drive motors ML,
There is no voltage applied to the MR that causes it to turn in the opposite direction (b). Therefore, even after the increasing optical axis detection voltage v reaches the optical axis setting voltage v8, the voltage vD' when the lIA recommended motor MR2MR, which has continued to rotate due to inertia etc., stops, is higher than the original axis detection voltage V. If the voltage dividing ratio of the voltage dividing circuit made up of the resistors R- and R3 is set so as to be small, there is no risk of hunting.

When the drive motors ML and MR tilt the upper hook of the headlamp in the same way, that is, when they rotate in the forward direction, the load they receive becomes heavier by the moment due to the weight of the headlamp l, so the rotation due to inertia increases. The amount is small compared to when rotating in the opposite direction. Therefore, the difference between the original axis detection voltage VD and vD', which is necessary to prevent the non-nching phenomenon, that is, the non-nching prevention area, can be made smaller compared to the case 0) described later. , by making the resistance line of resistor R3 relatively large, the voltage dividing ratio of the voltage dividing circuit consisting of R2 and R3 is increased. If the resistance line of resistor R3 is too small, the hunting prevention area will become unnecessarily wide.
This is undesirable because it becomes impossible to look at the angle exactly as the angle it of the optical axis of the headlight is set.

(3) When the base axis detection voltage vD is larger than the base axis setting voltage vs.

Contrary to the case of -), the movable element 8t of the variable resistor VR/ for setting the original axis is connected to the variable resistor R3 of the variable resistor VR/, and when it is moved to the next terminal 1 [, the optical axis setting voltage V, decreases and the original axis detection voltage ■.

becomes smaller than In this case, the comparison of tiICO
Ml does not generate an output voltage v0゜M/, and the λth comparison 50
0M, 2 is the output voltage■. . , is a foreshadowing that generated λ.

Therefore, the drive motors ML and MR rotate in opposite directions, and the headlight / is tilted to face downward, and the base shaft detection voltage vD gradually decreases accordingly. and,
When the original 〇Iiii side output voltage VD is equal to or lower than the original axis setting voltage VB, the seventh voltage comparator 00M/ outputs the voltage V. Generates OM'. Then, the common terminal C of the relay RL/ is connected to the make contact Mα, and as a result, the potential becomes the same as that of the anode of the electronic xFi electrode #AE of the drive motors ML and MR, and -10,000, the drive motors M'L, MR Since it maintains the same potential as the anode of the terminal E,
Drive motor ML.

No voltage is applied to MR. however,
Even in such a state, the drive motors ML and MR do not stop immediately due to inertia, and the original shaft detection voltage ■ is the same as in the case described above.

It takes time for the drive motors ML and MR to stop after the voltage decreases and becomes equal to the optical axis setting voltage v8, and during that time, the drive motors ML and MR rotate a certain amount due to inertia, and the headlights/ It tilts toward the bottom, and the original axis detection voltage VD also continues to decrease.

By the way, if the output voltage v0゜M,2 is generated from the second voltage ratio **00M2 in this way, that is, the comparator 00
When the potential of the output terminal of M2 is at the same level as the anode of the power supply X, the voltage comparators 00M/ and OOM, 20 input steel will be in the state I as shown in FIG. 3(B). That is, in such a case, the resistor Rμ becomes the resistance of the feedback circuit, and the stutter #
The terminal connected to the output terminal of the voltage comparator 00Mj of I is at the same potential as the anode of the key E. Then, the resistors R2 and Rμ constitute a voltage dividing circuit that divides the voltage Fl-VD, which is the difference between the power supply voltage E and the original axis detection voltage VD.
Note that the forward voltage of the diode D2 and the like are ignored. ), a voltage vD' between the connection point of the resistor R2 and the resistor Rμ of the voltage dividing circuit and ground is applied to the non-inverting input terminal of the comparator C0M2. The voltage vD' is higher than the public axis detection voltage vD of the terminal voltage of the resistor Rλ. Therefore, even if the gradually decreasing base detection voltage VD becomes G' lower than the base set voltage v8, the voltage vD' applied to the non-inverting input terminal is the base set voltage V.

The voltage comparators 00M, 2Fi continue to generate the output voltage v0゜- until it becomes smaller than 00M, 2Fi, and the Y terminals of the drive motors MI, MR fall to the same potential as the anode of the electric current S, and the voltage of the drive motors ML, MR The voltage that causes it to rotate in the forward direction cannot be applied to it.

Therefore, even after the decreasing optical axis detection voltage reached the optical axis setting voltage v8, the drive motor M continued to rotate due to inertia etc.
The resistor R is set so that the voltage vD1/ that is generated when L and MR are stopped is slightly larger than the optical axis detection voltage V.
If the resistance ratio of resistor RK to - is set, there is no risk of non-setting.

Furthermore, when the drive motors ML and MR tilt the headlight to face downward, that is, rotate in the opposite direction, the load received is lightened by the moment due to the headlight's own weight, so the rotation due to inertia is reduced. The amount is larger than when rotating in the forward direction. Therefore, since the difference between the optical axis detection voltages VD and VD' required to prevent hunting, that is, the hunting prevention area, must be made relatively thick, the resistance value of the resistor R≠ should be made relatively small. By doing so, the ratio of resistance Rλ to Rμ is increased.

In such an optical axis adjustment device, the Fi element axis detection voltage V
and one voltage comparator 00 that compares the original axis detection voltage VD.
One voltage V, , VD is directly applied to each input terminal of one of M/ and OOM, 2, 〇〇M/, and the other non-inverting input terminal of 00M2 is connected to the original axis detection via resistor R2. A voltage VD is applied (the optical axis setting voltage v8 applied to the inverting input terminal of 00M is directly applied to that terminal without going through a resistor).

Furthermore, the resistance R of the voltage comparator 00M is W! A feedback circuit is connected between the connected non-inverting input terminal and the output terminal, and this feedback circuit is connected to the diode DI.
, Dλ, the output voltage v0 of the voltage comparator 00Mλ
When ゜M2 does not occur, that is, when the output terminal is at ground potential, the resistor R3 acts as a feedback resistor, and when the output voltage v0゜M- occurs, that is, when the output terminal has the same potential as the anode of the power source 1, the resistor Rμ functions as a feedback resistor. Therefore, when the base axis setting voltage vEI is greater than the optical axis detection voltage vD and the main plows ML and MR are rotated forward and the headlights are tilted to face the upper hook, the width of the hunting prevention area is It can be arbitrarily set by adjusting the resistance value of the resistor R3 appropriately. In addition, when the reverse KIIA motors ML and MR rotate in the reverse direction to tilt the headlight to face downward, the anti-hunting area OS can be adjusted by adjusting the resistance value of the resistor R'tt to an appropriate value. Can be set to any. Therefore, the drive motor ML
The anti-hunting area when the MR rotates in the forward direction and the anti-hunting area when the MR rotates in the reverse direction can be set to widths corresponding to the amount of rotation due to the inertia of the drive motor in the corresponding rotation direction.

The feedback circuit is constructed by connecting a resistor R≠ in parallel to a series circuit of a resistor R3 and a diode D/or D2, as shown in Sμ diagrams (M) and (B)K. The number of 1-dos used can be reduced by /J.

As described above, the main shaft-11 of the wheel headlight of the present invention
In the device, the optical axis setting voltage and the optical axis detection voltage are directly applied to the input terminal of the first voltage comparator, and the second voltage comparator
A resistor is connected to one of the two input terminals of the voltage comparator Fi to receive the original axis setting voltage or the optical axis detection voltage through the resistor, and the first voltage comparator Fi is One voltage received at the inverting input terminal is received at the non-inverting input terminal, and the other voltage is received at the inverting input terminal.

moreover,#! A feedback circuit is connected between the input terminal and the output terminal of the voltage comparator of λ to which the resistor is connected, and this feedback circuit is connected to the potential of the input terminal of the second voltage ratio yIR comparator. The resistance value is set to be different when the output index is higher than the output index and when it is opposite to the output index. Therefore, the base shaft setting voltage is larger than the base shaft detection voltage, and as a result, the drive motor, which is switched between one rotation direction and the other by the switching circuit controlled by the λ voltage comparators, is rotated, for example, in the positive direction. When the base shaft setting voltage is smaller than the base shaft detection voltage and the drive motor is rotated in the opposite direction, mt of the nonching prevention region can be set to be different. Therefore, if the drive motor rotates in the forward direction, Ki?
It is possible to set the notching prevention area for the rotation direction and the notching prevention area for the reverse rotation to be 7tIllIiI depending on the inertia of the drive motor in the corresponding rotation direction.

Therefore, the amount of rotation due to the inertia of the drive motor that moves the main axis of the headlight in the vertical direction varies depending on the rotation direction of the drive motor, and it is possible to operate stably without causing knotting or the like. Moreover, the optical axis of the Fll illumination lamp can be set accurately at 90 angles.

The figure shows a modification of the switching circuit and drive motor of the wheel headlamp of the present invention. This modification uses two solenoids SL and one relay RL11- with SLI i as a switching circuit, and as a drive motor a drive motor ML having a common terminal OT and two terminals, that is, a forward rotation electronic FT and a reverse rotation electric one NT. ', MR'.

When only one solenoid SLI of the relay RL is energized, its common terminal C is connected to one finger S+, and when only the other solenoid sh= is energized, its common terminal is connected to the other terminal S, At other times, that is, when all solenoids SL, SLl are energized, and when neither solenoids EIL, SLl are energized, common terminal 0 is connected to which terminal S, , SLl.
It is also configured not to be connected to sm. 1 RU-RL
One solenoid SL is connected to the collector side of the transistor Q1, and the other solenoid 8 Lm Fi ) is connected to the collector side of the transistor Qv. Therefore, the common terminal C is #i terminal 81 when only the transistor is turned on.
When the transistor CtsC' is turned on, it is connected to the terminal 8m. When both transistors 1 and Qm are turned on, and when both are turned off, the common terminal 0 becomes a neutral state in which the common terminal 0 is not connected to either the terminals Si or 81.

Further, the drive motors ML' and MR' rotate in the forward direction when a voltage is applied between the common terminal OT and the forward rotation terminal FT, and when a voltage force 5 is applied between the common terminal OT and the reverse rotation terminal IT, the drive motors ML' and MR' rotate in the forward direction. The times are reversed.

According to this modification, when only the transistor Q1 is turned on, the drive motors ML' and MR' rotate forward, and when only the transistor Q1 is turned on, the drive motor ML'
, MR' are reversed, and when both transistors GL+ and Qs are on and when both are off, the drive motor M
L' and MR' stop rotating. Therefore, even if the motor switching circuit #S is configured with only one relay RL, the drive motors ML' and MR can be rotated in forward and reverse directions or stopped as appropriate, and the number of relays used can be reduced.

Although FIG. 1 schematically shows an example of the optical axis-viewing mechanism used in the base axis adjusting device of the present invention, this mechanism is merely a base axis adjustment mechanism that can be used in the base axis adjusting device of the present invention. This is just one example of a mechanism, and there are various possible light adjustment mechanisms that can be used in the optical axis 111F device of the present invention. Many variations are possible, and the invention is not limited to those shown in the drawings.

A simple W5tBA of French drawings Figures 7 to 3 show an example of the implementation of the optical axis adjustment device for a wheel headlamp according to the present invention. A schematic plan view showing the base shaft adjustment mechanism 11 used therein, Figure 2 is a circuit diagram showing an example of the base shaft adjustment circuit, and Figure 3 (M) Fi
A circuit diagram equivalently showing a part of the base axis adjustment circuit in a state where the base axis setting voltage is higher than the optical axis detection voltage, (B)
is a circuit diagram equivalently showing the same part as shown in (M) in case I in reverse case of (M), @V-diagrams (A), (B)
1. Optical axis adjustment device for a 5-utt light for a vehicle according to the present invention, respectively.
The third is a circuit diagram showing a modified version of the Ω feedback circuit, and the third is a circuit diagram showing a modified version of the switching circuit and drive motor of the original III alarm device of the present invention.

Explanation of symbols: Headlight, VR, Optical axis setting section, vRI, Original axis detection section, OOM...
... Comparison circuit, ML.

MR, ML', MR'... Drive motor,
E...Conductivity, RLl, R111%xL・
・・Voice C circuit, R51R4, DllDl・・・・
...Feedback circuit Figure 1 Figure 3 (, 4) (B) Figure 4

Claims (1)

[Scope of Claims] (1) An optical axis detection unit that outputs an electrical signal, that is, an optical axis detection signal, of a magnitude corresponding to the angle of the original axis of the headlamp, and a set angle of the optical axis of the headlamp; A source axis setting unit that outputs an electrical signal of a magnitude corresponding to the setting amount, that is, an optical axis setting signal, and an I that generates a detection signal when the optical axis setting signal is larger than the optical axis detection signal.
I/ comparator, a second comparator that generates a full detection signal when the optical axis detection signal is larger than the original axis setting signal, and a forward/reverse rotation depending on the polarity of the voltage applied to the terminal or the terminal to which the voltage is applied. control 1H by a drive motor that moves the base shaft of the headlight in the vertical direction, and the output of the @/ and second comparator.
The motor switching circuit consists of the first and a! At least one of the two comparators is configured such that it cannot generate a detection signal unless the difference between the original axis setting signal and the optical axis detection signal exceeds a certain value. A main shaft adjustment device for a wheel headlamp characterized by creating a fist area, that is, a hunting prevention area where the drive motor stops when changing from large to small or from small to large. Claim 1, characterized in that the width of the hunting prevention area is made different when the original axis setting signal changes from small to large and when it changes from large to small.
Main axis of wheel headlamp - Adjustment device (3) as described in Section 3. A main axis detection unit that outputs a voltage of a magnitude L less than the angle of the optical axis of the headlamp, and an angle of the main axis of the headlamp. a base axis setting section that outputs a voltage of a magnitude corresponding to the set amount, which can be set by operating a knob, etc.; 10,000 of the output voltage, that is, the optical axis detection voltage, is received at the non-inverting input terminal,
On the other hand, the seventh voltage ratio I! applied to the inverted input trend! - and 2
A resistor is connected to one of the two input terminals so that the terminal receives the original axis setting voltage or the optical axis detection voltage through the resistor, and the WL of the optical axis setting voltage and the optical axis detection voltage is connected to one of the two input terminals. The voltage comparator @2 receives one voltage received at the inverting input terminal of the voltage comparator /, and the voltage comparator @2 receives the other voltage at the non-inverting input terminal, and the resistor of the #2 voltage comparator is connected. A constant feedback circuit is connected between nine input terminals and its output terminal, and the resistance value is different when the potential of the input terminal is higher than the potential of the output terminal and when it is the opposite. Rotate in the opposite direction to move the optical axis of the headlight up and down.
When an output is generated from both of the two voltage comparators and when no output is generated from either of the two voltage comparators, When the drive motor and the power source that drives it are electrically disconnected, an output is generated only in the voltage comparator at -10,000, and when the output is generated at the first voltage comparator, the lift and the second The output is generated in the voltage comparator and the direction of rotation is reversed depending on the direction of rotation. The λ resistors have different resistance values, and the anode of the two diodes is connected to the output terminal of the comparator, and the cathode is connected to the input terminal of the comparator, and the anode of the other diode is connected to the input terminal of the comparator. -, the cathode is connected to the output terminal side. Naoyu (lK*
A device for viewing the axis of a vehicle headlamp, characterized in that a resistor is connected in parallel to a connected circuit.