JPH04295249A - Optical axis actuator for lamp - Google Patents

Abstract

PURPOSE:To provide an optical axis actuator for lamp having downsized profile by decelerating the rotation of motor with reduced number of members and varying the location of the motor. CONSTITUTION:A motor 1 is fixed to a fixing board 2 located in a frame F, a worm gear 3 is mounted on a motor shaft, motor speed is decelerated by means of a worm wheel gear 4 and a straight reciprocal locomotion mechanism is mounted on the worm wheel gear 4. In other words, an elongated groove 9 is made in a guide section 8 mounted on the worm wheel gear 4 and when a pin 7 at the guide section 8 slides in the elongated groove 9, a rod 11 coupled with the guide section 8 is supported by a rod guide 12 provided on the frame F and reciprocates straightly thus adjusting the optical axis of a lamp according to the displacement of the rod 12.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an actuator for adjusting the position of an optical axis of a lamp employed in an automobile or the like.

0002

2. Description of the Related Art A conventional optical axis actuator for a lamp of this type will be described with reference to FIGS. 3 and 4. The motor 20 is mounted on a mounting plate 21 installed in the frame F, and a pinion gear 22 and a deceleration intermediate gear 23 are provided on the motor shaft.
, the output gear 24 forms a gear train, and first, the pinion gear 22 of the motor shaft meshes with the intermediate gear 23, and the intermediate gear 23 meshes with the output gear 24, respectively. Therefore, the rotation of the motor 20 is transmitted to the output gear 2 through the pinion gear 22 and the intermediate gear 23.
The deceleration is transmitted to 4. The output gear 24 is rotatably supported at the center of a bearing 27 (not shown) attached to the mounting plate 21, and is located at a position offset from the center of the output gear 24 on the opposite side with the output gear 24 in between. A fixing plate 25 is provided. A guide portion 28 is attached to one side of the fixed plate 25,
Similar to the fixed plate 25, the guide portion 28 is connected to the output gear 2.
It is mounted in an eccentric position with respect to 4. A long groove 29 is formed in the center of the guide portion 28, and a pin 26 that can reciprocate within the long groove 29 is erected on the guide portion 28. Furthermore, the guide part 2
A rod 31 that can reciprocate within a rod guide 32 provided on the frame F is connected to one end of the frame F. So motor 2
When the output gear 24 rotates through the pinio gear 22 and the intermediate gear 23, the pin 26 that engages with the long groove 29 provided in the guide portion 28 reciprocates within the long groove 29 while being restricted by the relief portion 30. The rod 31 attached to the guide portion 28 is supported by the rod guide 32 and reciprocates in the direction of arrow G, and the position of the lamp optical axis (not shown) connected to the rod 31 is adjusted.

0003

[Problems to be Solved by the Invention] In the above-described actuator for adjusting the optical axis of a lamp, the pinion gear 22, intermediate gear 23, output gear 24, etc. forming a gear train are used as constituent members to obtain a specified reduction ratio. The configuration is complicated, which increases production costs, and since the drive motor is located facing the gear train through the mounting plate, the external dimensions of the optical axis actuator are large, resulting in a large configuration. There was a problem.

0004

[Means for Solving the Problem] Therefore, the present invention eliminates the above-mentioned defects and provides an optical axis actuator for a lamp with a simple structure. I will explain. In an optical axis actuator for a lamp, which is equipped with a gear that reduces and transmits the rotation of the motor, and a mechanism that is connected to the gear and performs linear motion by locomotion operation, the worm gear 3 can mesh with the worm gear 3 provided on the motor shaft. a worm wheel gear 4, and a rod 11 capable of rectilinear reciprocation connected to a guide portion 8 provided eccentrically on the worm wheel gear 4.
This is an optical axis actuator for a lamp, which has a long groove 9 bored in a guide part 8 provided in the worm wheel gear 4, and the guide part 8 is moved in accordance with the rotation of the worm wheel gear 4.
By sliding the pin 7 in the long groove 9, the guide part 8
A rod 11 connected to the frame F is supported by a rod guide 12 provided on the frame F and makes a rectilinear reciprocating motion, and the lamp optical axis is adjusted according to the displacement of the rod 12.

[0005]

[Operation] The rotation of the motor 1 is transmitted to the worm wheel gear 4 by the worm gear 3, and the pin 7 reciprocally slides in the long groove of the guide portion 8 in accordance with the rotation of the worm wheel gear 4. A rod 11 connected to the frame F moves straight back and forth while being supported by a guide portion 12 provided on the frame F, thereby displacing the lamp optical axis connected to the rod 11 and adjusting its position.

[0006]

[Embodiment] An embodiment of the present invention will be described below with reference to the accompanying drawings.
This will be explained with reference to FIG. A motor 1 is mounted on a mounting plate 2 installed within a frame F, and a worm gear 3 provided on the motor shaft meshes with a worm wheel gear 4 for deceleration. Therefore, the rotation of the motor 1 is directly transmitted to the worm wheel gear 4 for deceleration. The worm wheel gear 4 is rotatably supported by the central shaft portion (not shown) of the mounting bearing 5 of the mounting plate 2, and is offset from the center of the worm wheel gear 4 on the opposite side with the worm wheel gear 4 in between. A fixing plate 6 is provided at the position. A guide portion 8 is attached to one side of the fixed plate 6, and like the fixed plate 6, the guide portion 8 is mounted at an eccentric position with respect to the worm wheel gear 4. A long groove 9 is formed in the center of the guide portion 8, and a pin 7 that can freely slide back and forth within the long groove 9 is provided upright on the guide portion 8. Furthermore, a rod 11 that can reciprocate within a rod guide 12 provided on the frame F is connected to one end of the guide portion 8. Motor 1
The rotation of is transmitted to the worm wheel gear 4 through the motor shaft and the worm gear 3, and when the worm wheel gear 4 rotates, the pin 7 that engages with the long groove 9 provided in the guide part 8 moves inside the long groove 9 into the relief part. 10, the rod 11 connected to the guide portion 8 is supported by the rod guide 12 and repeats linear reciprocating motion in the direction of arrow G. Further, the distance of the linear motion of the rod 11 can be adjusted by adjusting the gear ratio of the gear train of the worm gear 3 and the worm wheel gear 4, the position of the guide portion 8, the length of the long groove 9, etc. Therefore, the lamp optical axis (not shown) connected to the rod 11 via the connecting member is displaced as the rod 11 moves, and the lamp optical axis position is adjusted.

[0007]

[Effect] According to the present invention, the rotation of the motor is transmitted at a reduced speed by the worm gear and the worm wheel gear, and the rod is reciprocated in a straight line by the locomotion operation of the guide section. Since the drive motor can be installed on the same side as the worm wheel on one side of the mounting plate, the actuator can be made smaller.

[Brief explanation of drawings]

FIG. 1 is a sectional view of an optical axis actuator for a lamp according to the present invention.

FIG. 2 is a side view of FIG. 1.

FIG. 3 is a sectional view of a conventional lamp optical axis actuator.

FIG. 4 is a side view of FIG. 3.

[Explanation of symbols]

1 Motor 2 Mounting plate 3 Worm gear 4 Worm wheel gear 6 Fixed plate 7 Pin 8 Guide part 9 Long groove 10 Escape part 11 Rod 12 Rod guide

Claims (2)

[Claims] [Claim 1] An optical axis actuator for a lamp, which is equipped with a gear that reduces and transmits the rotation of a motor, and a mechanism that is connected to the gear and performs linear motion by locomotion operation, which can mesh with a worm gear provided on the motor shaft. An optical axis actuator for a lamp includes a worm wheel gear, and a rod capable of linear reciprocating movement connected to a guide section provided eccentrically on the worm wheel gear. [Claim 2] A long groove is bored in the guide part provided on the worm wheel gear, and the pin of the guide part slides in the long groove in accordance with the rotation of the worm wheel gear, so that the rod connected to the guide part is moved. 2. The optical axis actuator for a lamp according to claim 1, wherein the optical axis actuator for a lamp is supported by a rod guide provided on a frame to perform linear reciprocating motion, and adjusts the optical axis of the lamp according to displacement of the rod.