JPS6335456B2 - - Google Patents

Abstract

PURPOSE:To make a retractable head lamp cease at accurate positions by driving a motor turn it up or down until the optical axis thereof reaches the high or low position and redriving the motor to raise the lamp to the low position from any overrun. CONSTITUTION:When an inclination angle indicating switch 40 is turned to right by one step so as to turn down an optical axis, a selector 43 comes into contact with the points 43N and 431 and another selector 44 comes into contact with the points 443 and 444 so that a transistor TR3 is turned off and transistors TR4 and TR1 are off. A motor 10 is then driven reversely until the selector SG of a feedback switch unit 12 makes contact with a contact point S2, causing a head lamp to stop. If the selector SG overruns to a contact point S3, the transistors TR3 and TR4 are on and off, respectively so that a transistor TR2 becomes on. The motor 10 is therefore turned clockwise until the selector SG makes contact with the contact point S2. At the time of the contact, the lamp is stopped. If the optical axis of the head lamp overruns its low position, it is redriven up to a stop of an accurate position.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to an optical axis adjustment device for setting the irradiation angle of a headlight, and in particular to a so-called retractable optical axis adjustment device that can be stored when the headlight is not used. The present invention relates to an optical axis adjustment device for setting the irradiation angle of a headlight.

(Prior art) For example, the height of the optical axis of a headlight in a car changes because the amount of suspension deflection changes depending on whether there is a driver alone, whether there are other passengers in the vehicle, or the position and amount of the loaded load. . If the optical axis is too high or too low, it will not only be difficult to drive, but the higher the optical axis, the more it will dazzle the driver of an oncoming vehicle, which can be dangerous.

Therefore, I set up a retractable headlight.
It has been proposed to use a retractable motor to adjust the optical axis of the headlight in accordance with the inclination angle of the vehicle body (Japanese Patent Laid-Open No. 138043/1983).

This optical axis adjustment device has a brush that rotates together with the motor and contacts that come into contact with the brush, and is different from the conventional retractable headlight in which the headlight is raised and retracted by the brush switching the contacts as the motor rotates. It is equipped with a contact point for adjusting the illumination point.

When the light point adjustment switch is turned on when the headlight is turned on, the motor is energized by this light point adjustment contact, and the headlight points slightly downward.If you adjust the length of this light point adjustment contact, The illumination angle of the headlight can be adjusted from the normal position to the indicated position further downward.

(Problems to be solved by the invention) However, with retractable headlights,
Since the load applied to the motor fluctuates considerably due to variations in parts, temperature changes, changes over time, etc., the drive torque of the motor must exceed the maximum load of the support mechanism, so high torque motors are generally used.

In addition, since the adjustment angle of the optical axis is extremely small compared to the movement angle when standing up and retracting, it is not possible to use the high torque motor as is when adjusting the optical axis, as in the conventional optical axis adjustment device described above. However, it has the disadvantage that it overruns the indicated position and cannot stop accurately.

Therefore, an object of the present invention is to accurately stop the headlight when adjusting the optical axis.

[Structure of the invention]

(Means for solving the problem) In order to achieve the above object, the present invention includes:
When adjusting the optical axis of the headlight, drive the motor to the indicated position and stop. When lowering the optical axis of the headlight, drive the motor to the indicated position and stop. At this time, overrun the indicated position. If this happens, raise the headlight again and stop energizing the motor at the indicated position. According to this, the rotation direction when the motor is stopped is always the same direction (increasing the optical axis), so the load on the motor is stopped in the same direction, making it possible to stop the headlamp accurately. Can be done.

(Example) Hereinafter, an example of the present invention will be described based on the drawings. Figure 1 shows the configuration of a retractable headlight. The headlight 1 is a right headlight placed on the right side of the vehicle facing forward. Headlight 1 is connected to bracket 3 by pin 2 at one end.
The bracket 3 is rotatably supported by a shaft, and the bracket 3 is fixed to the vehicle body 4. Also, headlight 1 has pin 5.
The link 6 is rotatably supported by the link 6.
The other end is pivotally supported by the arm 7. The arm 7 is fixed to a drive shaft 9 of a speed reduction mechanism 8. A rotating shaft of an electric motor 10 is coupled to an input shaft of the speed reduction mechanism 8 .

In the above configuration, pin 2, bracket 3,
Pin 5, link 6 and arm 7 are the headlight support mechanism. FIG. 1 shows the headlight 1 in an upright position. When the motor 10 rotates in this state, the drive shaft 9 and the arm 7 rotate, thereby the link 6 moves downward, and the headlight 1 rotates downward about the pin 2 and is stored.

FIG. 2 shows the speed reduction mechanism 8. A reduction gear 11 connected to the output of the motor 10 and transmitting rotational force to the drive shaft 9 is arranged in the reduction mechanism 8 . This reduction gear 11 is equipped with a feedback switch device 1.
2 (first switch device). This feedback switch device 12 is composed of a brush plate 13 and a brush 14.

FIG. 3 shows the brush plate 13 and brush 14. The hatched portion of the brush plate 13 indicates an insulating portion. Also, the brushes 14 _N , 14 ₁ , 1
4 ₂ , 14 ₃ , 14 ₄ , 14 _A , 14 _B , 14 _C , 14
_D , _14E , and _14G are brush contacts S _N , S ₁ , and
Comprising S ₂ , S ₃ , S ₄ , S _A , S _B , S _C , S _D , S _E , _SG ,
It is in contact with the brush plate 13 at this brush contact point. Note that the brush plate 13 rotates as the motor 10 rotates.

In addition to the above-mentioned right light, the head light includes a left light (not shown), and the left light is also equipped with a similar support mechanism, reduction gear, feedback switch device, and motor.

A manually operated knob 41 is shown in FIG. The manual operation knob 41 is connected to the shaft 2 of the tilt angle indicating switch device 40.
It is attached to 1. The switch device 40 is installed around the driver's seat in the vehicle interior, and a manual operation knob 41 is arranged so as to be exposed in the vehicle interior. This manual operation knob 41 is provided with a rotation direction detection switch SW3. Rotation direction detection switch SW3 is connected to shaft 21
The contact point 23 is usually fixed by a spring 22.
is open, and contact 24 is closed. When the manual operation knob 41 is rotated clockwise, that is, in a direction that adjusts the optical axis of the headlight downward, the contact 23 is closed, the contact 24 is opened, and the operation knob 41 is rotated. Rotate the operating knob 41 to a predetermined position,
When you release your hand, the spring 22 opens the contact 23.
Contact 24 is closed.

FIG. 5 shows the above-mentioned equipment of the right light and a tilt angle indicating switch device 40 equipped with a manually operated knob 41.
Indicates the connection relationship with The tilt angle indicating switch device 40 has a manual knob 41 on its rotating shaft 21.
is fixed. The first set of five contacts 43 _N ,
43 ₁ , 43 ₂ , 43 ₃ , and 43 ₄ are connected to brush contacts S _N , S ₁ , S ₂ , S ₃ , and S _4, respectively. Also, the second set of five contacts 44 _N , 44 ₁ , 44 ₂ , 4
4 ₃ and 44 ₄ also have brush contacts S _N , S ₁ , S ₂ ,
Connected to S ₃ and S ₄ . First selector 43
has a shape that allows it to contact only four of the five contacts in the first set, and similarly, the second selector 44 also contacts only four of the five contacts in the second set. The shape is such that it can come into contact with both at the same time.

A first set of five contacts, a second set of five contacts, and first and second selectors are similarly provided for the left light. 1st for right light
The second selectors 43, 44 and the first and second selectors for the left light are fixed to the same rotating shaft 21, and a manually operated knob 41 is fixed to the rotating shaft 21. The first selector 43 is connected to the emitter of a transistor TR1, and the collector of this transistor TR1 is connected to a relay RY2 and a diode D1. This diode D1 is further connected to the contact 27 of the rotation direction detection switch SW3 and the base of the transistor TR3. In addition, the rotation direction detection switch SW
The contact 25 of No. 3 is connected to the base of the transistor TR4. Next, the second selector 44 is connected to the emitter of the transistor TR2, and the collector of this transistor TR2 is connected to the common contact _SC of the relay RY1 and the changeover switch SW1. Further, relay RY3 is connected to common contact _SC of changeover switch SW1. Here, the state shown in FIG. 5 shows that relays RY1, RY2, and RY3 are all off. The connection for the left light is also similar. Next, when the knobs of the first selector 43 and the second selector 44 indicate "1", the first selector 43 is connected to the contact 43 _N , and the other contacts 43 ₁ , 43 ₂ , 43 ₃ , 43 ₄ , and the second selector 44 does not touch any of the contacts 44 _N , 4
1 ₁ but other contacts 44 ₂ , 44 ₃ ,
44 The shape and arrangement make contact with ₄ .
When the knob indicates "3", the first selector 43 contacts the contacts 43 _N , 43 ₁ and 43 ₂ , and the second selector 44 contacts only the contact 44 ₄ . The contact and selector combination for the left light is also exactly the same as that for the right light. In addition, although two sets of contacts and two selectors are shown distributed on a plane in FIG.
The two drawer contacts, each in contact with a set of selectors, are formed on the same printed circuit board concentrically and on the same plane with different radii, and each selector has a brush that contacts the four contacts. , and the brush for the drawer connection is one of the ring-shaped drawer contacts.
is in constant contact with.

Resistor R1 is a voltage regulator that reduces energization to motor 10. This resistor R1 is connected in series with the motor 10 during optical axis adjustment.

Further, the contacts S _A , S _B and _SC of the changeover switch SW1 are switched by brush contacts of the feedback switch device 12 shown in FIG. 3 .

In addition, the retractable actuation switch SW2 is
When you flip the switch to the UP side, the headlight stands up, and when you flip the switch to the DOWN side, the headlight retracts.

The following operation will be explained using the above configuration, but since the tilting of the left and right lights is exactly the same and is performed at the same time,
Hereinafter, only the operation of the right light will be explained.

First, the operation of raising and retracting the headlight will be explained. Figure 5 shows the headlight in an upright position, and in this state the retractable operating switch SW
2 to the down side, the changeover switch SW1
The contact S _B of is grounded. For this reason, relay RY1
Then, relay RY3 becomes conductive, causing motor 10 to rotate forward, thereby retracting the headlight. At this time, according to the rotation of the motor 10, the brush plate 1
3 rotates and the headlight reaches the predetermined storage position, the brush contact S _B contacts the insulation part of the brush plate 13, and the brush contact S _A contacts the insulated part of the brush plate 13.
Relay RY1 and relay RY3 are switched by contacting the conductor part of switch SW1.
is cut off, and the motor 10 is stopped.

Next, when the retractable actuation switch SW2 is turned to the UP side, the changeover switch SW1 is moved to the contact S _A
The contact of changeover switch SW1
S _A is grounded. Therefore, relay RY1 and relay RY3 are brought into conduction, causing motor 10 to rotate in reverse, thereby causing the headlight to stand up. At this time, similar to the retracting operation, the brush plate 13 rotates in accordance with the rotation of the motor 10, and when the headlight reaches a predetermined standing position, the brush contact S _A comes into contact with the insulating part of the brush plate 13, and the brush contact S _B is in contact with the conductor part of the brush plate 13, and the changeover switch SW
1 switches, relays RY1 and RY3 are cut off, and motor 10 is stopped.
Next, illumination angle adjustment will be explained.

Now, if the manual operation knob 41 of the tilt angle indicating switch device 40 is at the "1" position and the headlight is set at the indicated position of "1", the fifth
As shown in the figure, the feedback switch device 1
The selector S _G of No. 2 is in contact with the contact S ₁ . In this state, the first and second selectors 43 and 44 of the tilt angle indicating switch device 40 are not in contact with the contacts 43 ₁ and 44 ₁ , so the relays RY1 and RY2 are not energized and are stopped. There is.

Here, when the knob 41 is rotated one step clockwise and the knob 41 is set to the "2" position, the first selector 43 of the tilt angle indicating switch device 40
contacts the contacts 43 _N and 43 ₁ , and the second selector 44 contacts the contacts 44 ₃ and 44 ₄ . At this time, as described above, the contact 27 of the rotation direction detection switch SW3 is closed. Therefore, the base of the transistor TR3 is grounded, turning off the transistor TR3 and turning on the transistor TR4. Therefore, a predetermined voltage is applied to the base of the transistor TR1.

On the other hand, in the feedback switch device 12, since the selector S _G is connected to the contact S ₁ , the contact 43 of the tilt angle indicating switch device 40 is
is connected to the ground, the emitter of the transistor TR1 is connected to the ground via the first selector 43, and the transistor TR1 is turned on. Then,
Relay RY2 is energized and motor 10 is energized to reverse rotation. At this time, once the transistor TR1 is turned on, the transistor TR1 is turned on by the diode D1.
In order to connect the base of TR3 to ground, use the relay
RY2 continues to be energized. This causes the selector S _G of the feedback switch device 12 to rotate counterclockwise. When the selector S _G comes into contact with the contact S ₂ , the selector S _G becomes in a floating state, and the current supply to the relay RY 2 is stopped. Similarly, each time the knob of the tilt angle indicating switch device 40 is rotated one step clockwise, the motor 10 rotates the selector S _G of the feedback switch device 12 one step counterclockwise and then stops. An action is taken.

At this point, the headlight does not stop at the indicated position and overruns, causing the feedback switch device 1 to overrun.
If the second selector S _G does not stop at the contact S ₂ and overruns to the contact S ₃ , the second selector S G
4 is in contact with contactor 44 ₃ , so selector S _G
connected to earth via. At this time, since the contact 25 of the rotation direction detection switch SW3 is closed, the transistor TR3 is turned on and the transistor TR3 is turned on.
Since TR4 is off, a voltage is applied to the base of transistor TR2. Therefore, the second
When selector 44 is connected to ground, transistor TR2 is turned on and relay RY1 is energized.
Therefore, when current flows through the motor 10 and reverses the rotation, the selector S _G rotates clockwise, and the selector S _G contacts the contact S ₂ , the selector S _G becomes floating and the relay RY1 is no longer energized. Stop. In this way, if an overrun occurs when lowering the optical axis of the headlight, it is automatically raised and stopped at the designated position.

Contrary to the above, for example, when the knob of the tilt angle indicating switch device 40 is in the "3" position, the first selector 43 is connected to the contacts 43 _N , 43 ₁ and 43 _{2 .}
, the second selector 44 contacts only the contact ₄₄₄ , and correspondingly, the selector S _G contacts the contact 444.
While touching S ₃ , turn the knob counterclockwise 1
When the step rotates, the first selector 43 contacts only the contacts 43 _N and 43 ₁ , and the second selector 44 contacts the contacts 44 ₃ and 44 ₄ .

At this time, as mentioned above, turn on the rotation direction detection switch.
The contact 25 of SW3 remains closed. Therefore, when the second selector 44 is connected to ground via the selector S _G , the transistor TR2 is turned on and the relay is turned on.
RY1 is energized, current flows through the motor 10, and the motor rotates in reverse. As a result, the selector S _G rotates clockwise, and when the selector S _G contacts the contact S ₂ , the selector S _G becomes in a floating state, and the current supply to the relay RY 2 is stopped.

Note that, as long as the settings are the same, the left light simultaneously performs the same operation as the right light.

〔Effect of the invention〕

According to the present invention, even if the load on the motor changes due to variations in parts, temperature changes, changes over time, etc., the headlight can be accurately stopped.

Furthermore, there is a method to return to the indicated position when the indicated position is overrun by applying position feedback, but this method not only requires a complicated mechanism and is expensive, but also causes hunting and may not stop. According to the present invention, if the optical axis of the headlight overruns the indicated position when lowering, the optical axis is simply raised again to the second position, and hunting does not occur.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a headlight indicating mechanism according to an embodiment of the present invention, FIG. 2 is a sectional view showing a deceleration mechanism and a feedback switch device of the embodiment, and FIG. 4 is a partial sectional view showing the manual operation knob and the rotation direction detection switch, and FIG. 5 is a plan view showing the tilt angle indicating switch device, the feedback switch device, and the motor. FIG. 2 is a circuit diagram showing the wiring. 1... Headlight, 2, 5... Pin (headlight support mechanism), 3... Bracket (headlight support mechanism), 6... Link (headlight support mechanism), 7... Arm (headlight support mechanism), 8... Reduction mechanism, 12... Feedback switch device (first switch device), 10...
Motor, 40...Switch device for inclination angle indication (second switch device), R1... Resistor (voltage adjustment device), SW3... Rotation direction detection switch.

Claims (1)

[Scope of Claims] 1. A headlight support mechanism that tiltably supports the headlight and raises and stores the headlight by mechanical displacement; A motor that applies mechanical displacement to the headlight support mechanism; And, when raising the optical axis of the headlight,
If you want to move the optical axis of the headlight down by driving the motor to the indicated position and then stopping the energizing of the motor, drive the motor to the indicated position, stop energizing the motor, and then stop energizing the motor. An optical axis adjustment device for a headlight, which is equipped with a control device that energizes a motor in a direction to raise the headlight again if the headlight is not at the indicated position after the headlight has stopped. 2. The control device is equipped with a voltage regulator that reduces the energization to the motor, and when the headlight is raised or retracted, the motor is directly energized, and when the optical axis of the headlight is adjusted, the voltage regulator is used to reduce the energization to the motor. An optical axis adjustment device for a headlight according to claim 1, wherein a motor is energized.