US-20260126650-A1 - ACTUATOR FOR HEAD-UP DISPLAY

US20260126650A1US 20260126650 A1US20260126650 A1US 20260126650A1US-20260126650-A1

Abstract

An actuator for head-up display including a link coupled with one end of an aspherical mirror, a driving force transmission including a lead screw to move the link, a driver to rotate the lead screw in a direction of a rotation axis of a motor according to driving of the motor, a lead screw bracket coupled to the driver and supporting the driver, a vibration damper disposed between the driver and the lead screw bracket to absorb vibration of the motor, and a balance plate disposed adjacent to a lower end portion of the motor to damp the vibration of the motor. The driver includes a rotor shaft that extends along the rotation axis of the motor, and the balance plate is coupled to the rotor shaft.

Inventors

Byung Ki Kim

Assignees

HYUNDAI MOBIS CO., LTD.

Dates

Publication Date: 20260507
Application Date: 20250910
Priority Date: 20241101

Claims (10)

1 . An actuator for head-up display comprising: a link configured to be coupled with one end of an aspherical mirror; a driving force transmission including a lead screw configured to move the link; a driver configured to rotate the lead screw in a direction of a rotation axis of a motor according to driving of the motor; a lead screw bracket coupled to the driver and supporting the driver; a vibration damper disposed between the driver and the lead screw bracket and configured to absorb vibration of the motor; and a balance plate disposed adjacent to a lower end portion of the motor and configured to damp the vibration of the motor, wherein the driver includes a rotor shaft that extends along the rotation axis of the motor, and the balance plate is coupled to the rotor shaft.
2 . The actuator for head-up display of claim 1 , wherein the rotor shaft extends from the lower end portion of the motor toward the balance plate so that the lower end portion of the motor and the balance plate face each other at a constant interval.
3 . The actuator for head-up display of claim 2 , wherein the balance plate is disposed such that a rotation axis of the balance plate is disposed in the same axial direction as the rotation axis of the motor, and is coupled with the rotor shaft.
4 . The actuator for head-up display of claim 3 , wherein the balance plate includes a first hole or a second hole disposed at a preset position along a circumference of the balance plate.
5 . The actuator for head-up display of claim 4 , wherein the first hole forms a plurality of first holes disposed at a constant interval along the circumference of the balance plate.
6 . The actuator for head-up display of claim 5 , wherein the balance plate further includes a weight that is configured to be inserted into at least one of the plurality of first holes according to the vibration of the motor to damp the vibration.
7 . The actuator for head-up display of claim 4 , wherein in the balance plate, a size and/or arrangement of the second hole is adjustable according to the vibration of the motor.
8 . The actuator for head-up display of claim 3 , wherein the balance plate is coupled with the rotor shaft so that a rotational axis of the balance plate is disposed at an eccentric position from the rotational axis of the motor.
9 . The actuator for head-up display of claim 6 , wherein the weight comprises a metal material.
10 . The actuator for head-up display of claim 1 , wherein the vibration damper includes: a through hole disposed through both ends of a motor bracket configured to surround the motor; a damper that is fit-coupled into the lead screw bracket to absorb vibration of the motor and includes a damper hole corresponding to the through hole; a shoulder screw that penetrates the through hole, the damper hole, and the lead screw bracket; and a nut coupled to the shoulder screw.

Description

CROSS-REFERENCE TO RELATED APPLICATION This application claims the benefit of and priority to Korean Patent Application No. 10-2024-0153433, filed on Nov. 1, 2024, the entire disclosure of which is hereby incorporated herein by reference in its entirety. TECHNICAL FIELD The present disclosure relates to an actuator for a head-up display, and more specifically, to a vibration damping device that damps vibration of a motor using a balance plate. BACKGROUND The content described in this section simply provides background information for the present disclosure and does not constitute prior art. A head-up display is a device that displays images including vehicle speed, fuel level, route guidance information, or the like on a windshield, which is a front window of a vehicle. The head-up display is generally configured to display information of display projected from a picture generation unit on a windshield. The head-up display according to the related art rotates an aspheric mirror using a motor. Here, the aspheric mirror receives rotational power of the motor by making point contact with a power transmission that transmits the rotational power of the motor. When the aspherical mirror makes point contact with a power transmission, external force due to vibration and friction of the motor is concentrated at one point, which may cause wear and geometric transformation of the aspherical mirror. In the head-up display according to the related art, when the motor is driven based on high RPM, the vibration of the motor cannot be attenuated, and noise is generated accordingly. In addition, backlash occurs between a link and a lead screw that move horizontally based on the rotational power of the motor. The backlash that occurs between the link and the lead screw reduces the operation and reliability of the head-up display drive module. In other words, errors occur during the power transmission of a head-up display drive module, and vibration and noise occur due to external impacts, or the like. SUMMARY A main object of an actuator for head-up display according to one embodiment is to secure the stability of the entire system by adjusting a rotational balance of a motor using a balance plate. A main object of the actuator for head-up display according to one embodiment is to damp vibration caused by imbalance of a motor by using the balance plate. The problems to be solved by the present disclosure are not limited to the problems mentioned above, and other problems not mentioned can be clearly understood by those skilled in the art from the description below. According to an embodiment of the present disclosure, there is provided an actuator for head-up display comprising a link configured to be coupled with one end of an aspherical mirror, a driving force transmission including a lead screw configured to move the link, a driver configured to rotate the lead screw in a direction of a rotation axis of a motor according to driving of the motor, a lead screw bracket coupled to the driver and supporting the driver, a vibration damper disposed between the driver and the lead screw bracket and configured to absorb vibration of the motor, and a balance plate disposed adjacent to a lower end portion of the motor and configured to damp the vibration of the motor. The driver includes a rotor shaft that extends along the rotation axis of the motor, and the balance plate is coupled to the rotor shaft. The rotor shaft may extend from the lower end portion of the motor toward the balance plate so that the lower end portion of the motor and the balance plate face each other at a constant interval. The balance plate may be disposed such that a rotation axis of the balance plate is disposed in the same axial direction as the rotation axis of the motor, and may be coupled with the rotor shaft. The balance plate may include a first hole or a second hole disposed at a preset position along a circumference of the balance plate. The first hole may form a plurality of first holes disposed at a constant interval along the circumference of the balance plate. The balance plate may further include a weight that is configured to be inserted into at least one of the plurality of first holes according to the vibration of the motor to damp the vibration. In the balance plate, a size and/or arrangement of the second hole may be adjustable according to the vibration of the motor. The balance plate may be coupled with the rotor shaft so that a rotational axis of the balance plate is disposed at an eccentric position from the rotational axis of the motor. The weight may include a metal material. The damper may include: a through hole disposed through both ends of a motor bracket configured to surround the motor; a damper that is fit-coupled into the lead screw bracket to absorb vibration of the motor and includes a damper hole corresponding to the through hole; a shoulder screw that penetrates the through hole, the damper hole, and the lead screw bracke