JPH0134592Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an optical axis adjustment device for a retractable headlamp of an automobile.

Conventionally, there are hydraulic type and electric motor type optical axis adjustment devices for headlights, but these devices are separate from the storage device, and a storage device is required separately from the optical axis adjustment device.

The purpose of this invention is to provide an optical axis adjustment device that can retract and expose the headlight and finely adjust the optical axis position using a single electric motor, and that operates stably. be.

Therefore, the optical axis adjustment device for a retractable headlamp according to the present invention drives a link mechanism by forward rotation of an electric motor, and the retractable headlamp is retracted and exposed. , a changeover switch means for selectively commanding the exposure position and the optical axis adjustment position;
a headlight position detection means disposed on a motor shaft disk connected to the motor and detecting the rotational angular position of the headlight; and an optical axis position detection means that is speed-up-linked with the motor shaft disk and detects the optical axis position. energized by the difference between the detection signals of the headlamp position detection means and the optical axis position detection means and the command from the changeover switch means, the signals from the headlamp position detection means and the optical axis position detection means are activated. forward rotation switch means and reverse rotation switch means that are selectively energized to cause the motor to rotate forward and reverse until a signal from the selector matches a command from the changeover switch means; It is characterized by fine adjustment of the exposure position of the headlight by forward and reverse rotation.

According to the above configuration, since the optical axis position detection means is provided in the speed increasing disk that accelerates the rotation angle of the motor shaft disk, even if the motor shaft disk rotates by a small angle, the speed increasing disk increases the speed. By magnifying and rotating to a large angle, it is possible to detect the optical axis position with high precision, and the optical axis of the headlight can be adjusted well so that it does not deviate from the desired optical axis adjustment position. be done.

According to a first embodiment of the present invention, the changeover switch means has a diode having an anode connected to the optical axis adjustment position and a cathode connected to the exposed position. According to this embodiment, when the optical axis adjustment position is suddenly selected by the changeover switch means while the headlight is in the retracted state, current flows from the contact at the optical axis adjustment position to the contact at the exposed position via the diode. This has the advantage that the headlights can be exposed first and then the optical axis can be adjusted.

According to a second embodiment of the present invention, the optical axis position detecting means is a plate switch. According to this embodiment, the motor can be rotated in the forward or reverse direction as desired by the switching action of the plate switch without requiring a switching element such as a transistor, so the configuration is relatively simple. , it has the advantage of being able to provide an inexpensive device.

According to a third embodiment of the present invention, the optical axis position detecting means is a variable electric resistor. According to this embodiment, since minute optical axis position detection is possible, there is an advantage that an apparatus with high optical axis adjustment accuracy can be provided.

The invention will be explained by means of illustrated embodiments. As shown in FIG. 1, a headlamp 1 is fixed to a lamp support 2 and is swingably attached to the vehicle body by a pin 3. One end of the lamp support 2 is connected to a link arm 5 by a connecting rod 4. The link arm 5 is fixed to a motor output shaft 6 that slows down the rotation of the electric motor 10, and is rotationally driven. In other words,
Depending on the rotation angle position of the link arm 5, the headlight 1
is stored in the vehicle body or exposed from the vehicle body. 11 indicates the bonnet of the vehicle body.

A motor shaft disk 7 is fixed to the motor output shaft 6. The motor shaft disk 7 has a tooth surface formed around it, is meshed with a small gear 8, and is connected to the motor output shaft 6.
The rotation angle is increased by the small gear 8 and transmitted to the speed increasing disk 9.

In the first embodiment of the present invention, as shown in FIG. 2, a conductive headlamp position detection plate 12 is pasted on the surface of the motor shaft disk 7 by sandwiching an electrically insulating film (not shown). It is worn. The headlight position detection plate 12 has a notch 12A in a part thereof. The contact pieces 7a, 7b and 7c that slide on the rotating headlamp position detection plate 12 are moved closer to the center so that the contact piece 7a does not touch the notch 12A of the plate 12, and the contact pieces 7b and 7c are moved to the front. It is arranged near the periphery so as to pass through the notch 12A of the illumination position detection plate 12. Contact pieces 7a, 7b
7c and the headlight position detection plate 12 are electrically switched on and off between the contact pieces 7b and 7c by the headlight position detection plate 12, using the contact piece 7a as a common contact according to the rotation of the motor shaft disk 7. The plate switch serves as headlight position detection means.

The relationship between the angular position of the motor shaft disk 7 and the position state of the headlight 1 is that when the notch 12A of the headlight position detection plate 12 is at the position of the contact piece 7b, the headlight 1 is exposed. , the notch 12A is the contact piece 7c
When in the position, the headlight 1 is in the retracted state.

A conductive insulating film is sandwiched between the surface of the speed-increasing disk 9, and two conductive optical axis position detection plates 13,
14 is pasted across a gap 13A. Contact pieces 9a, 9b, 9c, 9d, and 9e that slide on the attached optical axis position detection plates 13, 14
However, when the headlamp 1 is exposed, the contact pieces 9a, 9b and 9c are arranged near the gap 13A, and the contact pieces 9d and 9e are arranged approximately at the center of the optical axis position detection plate 13 and the optical axis position detection plate 14, respectively. is located. The contact piece 9d is used as a common contact for forward rotation of the motor 10, and the contact piece 9e is used as a common contact for reverse rotation, and optical axis position detection plates 13 and 14 electrically connect and disconnect between the contact pieces 9a, 9b, and 9c. The plate switch serves as optical axis position detection means.

The changeover switch 15 selects and commands the storage position, exposure position, and optical axis adjustment position of the headlamp 1, and includes the storage position 15a, the exposure position 15b, and the optical axis adjustment positions 15c and 15d for selecting the optical axis adjustment position. and 15e.

The forward rotation relay 16 is a forward rotation switch means for driving the motor 10 in forward rotation, and the reverse rotation relay 17 is a reverse rotation switch means for driving the motor 10 in reverse rotation. The forward rotation relay 16 has normally open contacts 16a, 16d and normally closed contact 1.
6b, 16e, switching contact pieces 16c, 16f, and relay coil 16g, and switching contact pieces 16c, 16f.
are switched in conjunction with each other by relay coil 16g. The reverse rotation relay 17 has a normally open contact 17a, a normally closed contact 17b, a switching contact piece 17c, and a relay coil 17.
d. Normally open contact 1 of forward rotation relay 16
6a and the normally open contact 17a of the reverse rotation relay 17 are connected to the positive electrode of the battery 18, and the normally closed contacts 16b, 16
e and 17b are grounded, and the motor 10 is connected between the switching contact piece 16c and the switching contact piece 17c. Relay coil 1 in forward rotation relay 16
One end of the relay coil 16g is connected to the contact piece 7a and the contact piece 9d, and the other end of the relay coil 16g is grounded. Relay coil 1 in reverse rotation relay 17
One end of the relay coil 17d is connected to the contact piece 9e, and the other end of the relay coil 17d is connected to the switching contact piece 16f of the forward rotation relay 16. Forward rotation relay 16
The normally open contact 16d of is not connected to anything.

In the changeover switch 15, the storage position 15a is connected to the contact piece 7c of the motor shaft disk 7, the exposed position 15b is connected to the contact piece 7b, and the optical axis adjustment positions 15c, 15d, 15e are connected to the contact piece 7c of the speed increasing disk 9. It is connected to pieces 9c, 9b, and 9a, respectively. In addition, the optical axis adjustment position 15 of the changeover switch 15
Three diodes 24 are connected between the optical axis adjustment positions 15c, 15d and 15e and the exposure position 15b, respectively.
Connect the anodes to 15d and 15e, expose position 1
The polarity is such that the cathode is connected to the terminal 5b.

The operation of the first embodiment will be explained.

When the storage position 15a is selected with the changeover switch 15, the voltage of the battery 18 is applied to the relay coil 16g of the forward rotation relay 16 via the storage position 15a, the contact piece 7c, the headlight position detection plate 12, and the contact piece 7a. For excitation, switching contacts 16c, 16
f contacts normally open contacts 16a and 16d, respectively. Current flows from the positive electrode of the battery 18 to the normally open contact 16a, the switching contact 16c, the motor 10, the switching contact 17c, the normally closed contact 17b, and the ground, and the motor 10 starts rotating in the normal direction. The rotation direction of the motor shaft disk 7 and the speed increasing disk 9 when the motor 10 rotates forward is set to the second direction.
Illustrated by arrows in the figure. The motor shaft disk 7 rotates approximately 180 degrees, and the notch 1 of the headlight position detection plate 12
When the contact piece 2A reaches the position of the contact piece 7c, the contact piece 7c and the contact piece 7a are no longer electrically connected, so the excitation of the relay coil 16g is cut off and the motor 10 is stopped. In other words, the switching contact piece 16 of the forward rotation relay 16
c and 16f are in contact with the normally closed contacts 16b and 16e, respectively, and both ends of the motor 10 are in contact with the normally closed contacts 16
b, and the normally closed contact 17b of the reverse rotation relay 17
grounded via. In addition, the reverse rotation relay 17
The ground side of the relay coil 17d is connected to the switching contact piece 1.
6f and is grounded via the normally closed contact 16e.
At this time, the headlight 1 is in the retracted state.

Next, when the exposed position 15b is selected with the changeover switch 15, the voltage of the battery 18 is applied to the relay coil of the forward rotation relay 16 via the exposed position 15b, the contact piece 7b, the headlight position detection plate 12, and the contact piece 7a. 16g is excited, and the motor 10 starts rotating forward in the same manner as described above. The motor shaft disk 7 is approximately
When the motor 10 rotates 180 degrees and the notch 12A of the headlight position detection plate 12 reaches the position of the contact piece 7b as shown in FIG. 2, the motor 10 stops because the relay coil 16g is de-energized. At this time, the headlight 1 is in an exposed state.

Next, use the changeover switch 15 to set the optical axis adjustment position 15c,
Select either 15d or 15e. For example, a case will be described in which the optical axis adjustment position 15e is selected.

The voltage of the battery 18 is determined by the optical axis adjustment position 15e, the contact piece 9a, the optical axis position detection plate 14, and the contact piece 9.
e, passes through the relay coil 17d of the reverse rotation relay 17, and then joins the path to ground via the switching contact 16f and normally closed contact 16e of the forward rotation relay 16, so the relay coil 17d is excited. Then, the switching contact piece 17c is switched to the normally open contact 17a. Then, a current flows from the positive electrode of the battery 18 to the normally open contact 17a, the switching contact 17c, the motor 10, the switching contact 16c, the normally closed contact 16b, and the ground, and the current flows in the opposite direction to the motor. 10
The motor 10 starts rotating in the reverse direction.
When the speed increasing disk 9 rotates counterclockwise and the gap 13A between the optical axis position detection plates 13 and 14 reaches the position of the contact piece 9a, the excitation of the relay coil 17d is cut off, so that the relay 17 returns to the state shown in FIG. 2, and the motor 10 stops. Since the speed increasing disc 9 is increased in speed by the small gear 8, even if the rotation angle of the speed increasing disc 9 is large, the motor output shaft 6
The rotation angle is small, and the optical axis of the headlamp 1 is finely adjusted.

When the optical axis adjustment position 15c, 15d or 15e is suddenly selected by the changeover switch 15 while the headlamp 1 is in the retracted state, the diode 24 first exposes the headlamp 1 and then performs the optical axis adjustment operation. This is to apply a voltage also to the exposed position 15b in order to perform this operation.

For example, if the changeover switch 15 selects the optical axis adjustment position 15e when the headlamp is in the retracted state, that is, when the notch 12A is in the position of the contact piece 7c, the current flows to the next path.

Positive electrode of battery 18 → optical axis adjustment position 15e → diode 24 → contact piece 7b → headlight position detection plate 12 → contact piece 7a → relay coil 16g → ground.

At the same time, due to the excitation of the relay coil 16g, the switching contacts 16c and 16f of the forward rotation relay 16 are connected to the normally open contacts 16a and 16d, respectively, so that a current flows in the motor 10 toward the right side in the figure. The motor 10 rotates forward, and the motor shaft disc 7 rotates forward until the notch 12A comes to the position of the contact piece 7b as shown in FIG. 2, thereby exposing the headlamp from the vehicle body. When the notch 12A comes to the position of the contact piece 7b, the contact piece 7a
Since conduction with the contact piece 7b is lost, the relay coil 16g of the forward rotation relay 16 is no longer excited, and the switching contacts 16c and 16f come into contact with the normally closed contacts 16b and 16e, respectively, as shown in FIG. Although the forward rotation of the motor 10 is temporarily stopped, the speed-increasing disk 9 rotates to the position shown in FIG. 2, so that the current begins to flow to the next path.

Positive electrode of battery 18 → optical axis adjustment position 15e → contact piece 9a → optical axis position detection plate 14 → contact piece 9e →
Relay coil 17d of reverse rotation relay 17 → switching contact piece 16f → normally closed contact 16e → ground.

Then, due to the excitation of the relay coil 17d, the switching contact piece 17c of the reverse rotation relay 17 changes to the normally open contact 17.
Since contact is made with point a, the motor 10 rotates in the reverse direction due to current flowing through the next path.

Positive electrode of battery 18 → normally open contact 17a → switching contact piece 1
7c → motor 10 → switching contact piece 16c of forward rotation relay 16 → normally closed contact 16b → ground.

When the motor 10 rotates in the opposite direction, the speed increasing disk 9
rotates in the opposite direction, and the motor 10 has the contact piece 9a in the gap 13.
The headlight's optical axis is adjusted because it rotates in the opposite direction until it reaches . Therefore, even if the optical axis adjustment position 15e is selected with the headlamp in the retracted position, the optical axis adjustment is performed after the headlamp is moved to the exposed position.

A second embodiment in which a variable electrical resistor is used as the device position detection means will be described with reference to FIG.

In this second embodiment, the pinion 8 has a speed increasing disk 9.
Instead, a potentiometer 19, which is a variable electrical resistor, is attached. potentiometer 1
Needless to say, 9 is used without a stopper and can rotate many times in the same direction.

The changeover switch 20 is used to select and command the position of the headlight 1, and includes a retracted position 20a and an exposed position 20.
b, has an optical axis adjustment position 20c. The anode of the diode 24 is connected to the optical axis adjustment position 20c of the changeover switch 20, and the cathode of the diode 24 is connected to the exposed position 20b.

The optical axis selection switch 21 is used to select and command the optical axis adjustment position of the headlamp 1 during exposure, and has a voltage dividing resistor therein capable of switching the voltage taken out to the output 21a. Changeover switch 20 and optical axis selection switch 21
This constitutes a changeover switch means for selecting and commanding the storage position, exposure position, and optical axis adjustment position of the headlight.

The comparison switching circuit 22 compares the voltage of the output 19a of the potentiometer 19 and the optical axis selection switch 2.
The voltages of the output 21a of the transistor 1 are compared, and if the difference between the two voltages is larger than a certain value (approximately 0.6V), either the transistor 22A or the transistor 22B is made conductive. For example, if the voltage at the output 19a of the potentiometer 19 is higher than the voltage at the output 21a of the optical axis selection switch 21, the transistor 22A becomes conductive, energizing the auxiliary relay 23, and energizing the forward rotation relay 16.
The motor 10 starts rotating forward. Since the other configurations are the same as those in the first embodiment, the same or equivalent parts are given the same reference numerals and the explanation will be omitted.

The operation of the second embodiment will be explained.

The operation when the storage position 20a or the exposure position 20b is selected by the changeover switch 20 is the same as that described in FIG. 2 above.

A case where the selection command for the optical axis adjustment position 20c is given by the changeover switch 20 will be explained.

When the headlight is in the retracted state, the notch 12A
is at the position of the contact piece 7c, and the contact piece 7b is in contact with the headlight position detection plate 12, so when the changeover switch 20 is set to the optical axis adjustment position 20c, the current flows to the next path.

Positive electrode of battery 18→optical axis adjustment position 20c→diode 24→contact piece 7b→headlight position detection plate 12→contact piece 7a→relay coil 16g of forward rotation relay 16→ground.

Then, relay coil 1 of forward rotation relay 16
6g is excited, the switching contact pieces 16c,
16f contacts the normally open contacts 16a and 16d, and one end of the motor 10 is connected to the positive electrode of the battery 18 via the switching contact piece 16c and the normally open contact 16a, and the relay coil 17 of the reverse rotation relay 17
The upper end of d is the switching contact piece 16f and the normally open contact 16d.
Since the relay coil 17d is grounded through the relay coil 17d, even if the transistor 22B is turned on during the headlamp exposure operation, the relay coil 17d is not energized. Therefore, the current from the battery 18 flows through the following path.

Positive electrode of battery 18 → normally open contact 16a → switching contact piece 1
6c → Motor 10 → Switching contact piece 17c → Normally closed contact 1
7b → ground.

Then, the motor 10 rotates in the forward direction, and the notch 12A of the motor shaft disk 7 becomes the contact piece 7b as shown in FIG.
Rotate until it is in position and the headlights are exposed.

At this time, the rotational position of the motor shaft disk 7 is in the state shown in FIG. 3. Further, the conduction between the contact piece 7b and the contact piece 7a is established when the contact piece 7b is connected to the notch 12.
A, the relay coil 16g of the forward rotation relay 16 is deenergized, and the switching contacts 16c and 16f contact the normally closed contacts 16b and 16e, respectively, as shown in FIG. are doing. Next, the optical axis adjustment operation begins. The voltage of the battery 18 is passed through the optical axis adjustment position 20c to a potentiometer 19 connected to a small gear 8 and increased in speed in conjunction with the motor shaft disc 7, and an optical axis selection switch 21 connected to a partial voltage resistance. is being applied. A voltage corresponding to the angular position of the pinion 8 is generated at the output 19a of the potentiometer 19, and a voltage corresponding to the selected position of the optical axis selection switch 21 is generated at the output 21a.
The comparison switching circuit 22 compares the voltage of the output 19a of the potentiometer 19 and the optical axis selection switch 2.
Compare the voltage of output 21a of 1 and if the difference between the two is greater than a certain value (approximately 0.6V), auxiliary relay 2
3 or energize the reverse rotation relay 17. Since the auxiliary relay 23 is an auxiliary relay for exciting the forward rotation relay 16, when the auxiliary relay 23 is excited, the forward rotation relay 16 is excited. As a result, the motor 10 starts rotating forward or backward, rotating the small gear 8, and the voltage at the output 19a of the potentiometer 19 changes to the output 2 of the optical axis selection switch 21.
The motor 10 stops at the position where the voltage becomes equal to the voltage of 1a. In other words, the fine adjustment of the optical axis has been completed.

As described above, the optical axis adjustment device for a retractable headlamp according to the present invention drives the link mechanism by forward rotation of an electric motor to retract and expose the retractable headlamp. a changeover switch means for selectively instructing a storage position, an exposure position, and an optical axis adjustment position of the motor, and a headlight position detection means disposed on a motor shaft disk connected to the motor and detecting a rotational angular position of the headlight. , due to differences in the detection signals of the optical axis position detecting means which is interlocked with the motor shaft disc to increase the speed and detect the optical axis position, the headlight position detecting means and the optical axis position detecting means, and the command from the changeover switch means. and selectively energizes the motor to rotate forward and reverse until the signal from the headlamp position detection means and the signal from the optical axis position detection means match the command from the changeover switch means. The motor is equipped with a forward rotation switch means and a reverse rotation switch means, and fine adjustment of the exposure position of the headlight is made by rotating the motor in the forward and reverse directions. It is possible to store and expose the illumination light and finely adjust the optical axis position, and by detecting the angular position that has been accelerated and expanded, stable operation can be achieved when adjusting the optical axis. .

[Brief explanation of the drawing]

FIG. 1 is a side view of the optical axis adjustment device according to the present invention,
FIG. 2 is a circuit diagram of a first embodiment using a plate switch, and FIG. 3 is a circuit diagram of a second embodiment using an electric resistor. 1... Headlight, 3... Pin, 4... Connecting rod, 5
...Link arm, 6...Motor output shaft, 7...
Motor shaft disc, 7a, 7b, 7c...Contact piece, 8
...Small gear, 9...Speed-up disk, 9a, 9b, 9
c, 9d, 9e...Contact piece, 10...Electric motor, 11...Bonnet, 12...Headlight position detection plate, 13, 14...Optical axis position detection plate, 16...Relay for forward rotation, 17... Relay for reverse rotation, 19... Potentiometer, 20... Changeover switch, 21... Optical axis selection switch, 22...
Comparison switching circuit, 24...diode.

Claims (1)

[Claims for Utility Model Registration] (1) In a retractable headlamp that is retracted and exposed by driving a link mechanism by forward rotation of an electric motor, the storage position, the exposed position, and the optical axis adjustment of the headlamp. a changeover switch means for selectively commanding a position; a headlight position detection means disposed on a motor shaft disc connected to the motor and detecting the rotational angular position of the headlamp; an optical axis position detection means for detecting the optical axis position, and is energized by the difference between the detection signals of the headlight position detection means and the optical axis position detection means and the command from the changeover switch means, and detects the headlight position. forward rotation switch means and reverse rotation that are selectively energized to cause the motor to rotate forward and reverse until the signal from the means and the signal from the optical axis position detection means match the command from the changeover switch means; 1. An optical axis adjustment device for a retractable headlamp, comprising: switch means for finely adjusting the exposure position of the headlamp by forward and reverse rotation of the motor. (2) The optical axis adjustment device for a retractable headlamp according to claim 1, which is a utility model and has a diode having an anode connected to the optical axis adjustment position and a cathode connected to the exposed position of the changeover switch means. (3) The optical axis adjustment device for a retractable headlamp according to claim 1, wherein the optical axis position detection means is a plate switch. (4) The optical axis adjustment device for a retractable headlamp according to claim 1, wherein the optical axis position detection means is a variable electric resistor.