Headlight Rotation Adjustment Mechanism for Linear Optical Axis Tuning
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Solution Overview
Problem
Existing headlight devices face challenges in achieving a linear relationship between the rotation angle of the optical module and the unit movement amount of the adjustment unit, leading to low-resolution direction adjustments of the optical axis.
Innovation Solution
A rotation adjustment mechanism is introduced, where the optical module is supported to be freely rotatable around a first rotary shaft, with a slider movable along a slide axis orthogonal to the shaft, featuring a connection groove and projection part that maintain a constant contact point locus, ensuring a linear relationship between the slider's movement and the optical module's rotation angle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a linear movement mechanism of an adjustment unit is used to adjust the direction of the optical module, then the optical module can be adjusted in direction, but the rotation angle of the optical module does not have a linear relationship with the unit movement amount of the linear movement mechanism, resulting in low resolution adjustment
Solution Approach 1:
The invention employs a curved guide surface with a specific arc-shaped profile that corresponds to the rotation radius of the optical module. This curved geometry transforms the linear movement of the adjustment unit into a rotational movement with a linear relationship between displacement and rotation angle, thereby achieving high-resolution adjustment while maintaining structural simplicity.
Solution Approach 2:
The invention introduces a guide surface as an intermediary element between the linear movement mechanism and the rotational optical module. This guide surface acts as a mediator that converts linear displacement into precise rotational motion, establishing a linear relationship between the adjustment unit's movement amount and the optical module's rotation angle.
2Device complexity
If the adjustment unit is placed at a position apart from the rotary support part of the optical module, then the structure is simplified, but the rotation angle does not have a linear relationship with the unit movement amount
Solution Approach 1:
The guide surface is designed with a curved profile that matches the rotational arc of the optical module. This curvature allows the adjustment unit to be positioned away from the rotary support while maintaining a linear relationship between linear displacement and rotation angle, thus simplifying the overall structure without compromising adjustment precision.
Data Source
AI summary
A rotation adjustment mechanism includes a rotation target module supported to be freely rotatable with respect to a fixation member around a first rotary shaft and an adjustment unit including a slider. Rotation of the rotation target module around the first rotary shaft is regulated by a contact point where a connection groove of the rotation target module and a projection part of the slider contact each other, and a shape of a surface of the connection groove contacting the projection part is a shape formed by a locus that successively connects the contact points of the connection groove and the projection part each of which is obtained each time the rotation target module is moved around the first rotary shaft by a unit angle and simultaneously the projection part fixed to the slider is translated by a constant amount in a direction parallel to the slide axis.