Interpupillary Adjustment Linkage for Optical Axis Alignment
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Solution Overview
Problem
Most head mounted electronic devices fail to align the user's eyes with the optical axes of the optical modules, leading to suboptimal image definition and field of view.
Innovation Solution
An interpupillary distance adjustment module that adjusts the width of the eyes by a linkage mechanism between two optical module bases, using a linkage rod and toggle switch to equidistantly move the modules, allowing adjustment of the interpupillary distance between 50 and 80 mm.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the head mounted electronic device uses fixed optical modules, then the device structure is simple, but the user's eyes cannot be aligned with the optical axes leading to suboptimal image definition and field of view
Solution Approach 1:
The patent applies the dynamics principle by transforming the fixed optical module structure into a movable one. The optical modules are mounted on adjustable bases that can move along guide rails, allowing the interpupillary distance to be dynamically adjusted to match different users' eye spacing, thereby achieving precise alignment between the user's eyes and the optical axes while maintaining a relatively simple overall structure.
2Manufacturing precision
If the head mounted electronic device uses adjustable optical modules, then the image definition and field of view are optimized, but the device structure becomes more complex
Solution Approach 1:
The patent applies the dynamics principle by transforming the fixed optical module structure into a movable one. The optical modules are mounted on adjustable bases that can move along guide rails, allowing the interpupillary distance to be dynamically adjusted to match different users' eye spacing, thereby achieving precise alignment between the user's eyes and the optical axes while maintaining a relatively simple overall structure.
3Ease of operation
If the interpupillary distance is adjusted manually, then the device structure is simple, but the adjustment process is time-consuming and inconvenient
Solution Approach 1:
The patent applies the mechanics substitution principle by replacing the traditional manual mechanical adjustment method with an automated motor-driven system. Motors are installed on the adjustable bases to automatically move the optical modules along the guide rails, transforming the manual adjustment operation into an automated control process, thereby significantly improving ease of operation while keeping the control mechanism relatively simple.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enhances image quality in VR and AR by aligning the user's eyes with the optical axes, achieving best definition and field of view.
Implementation Method 1
a linkage mechanism comprising a linkage rod, a third point and a fourth linkage point, wherein the linkage rod has a rotation point, the third and the fourth linkage points are symmetrically disposed at both ends of the rotation point of the linkage rod
Implementation Method 2
the rotation point of the linkage rod is pivotally connected to the shaft
Implementation Method 3
the first and second sliders are disposed in the first and second grooves respectively and move in the first groove direction
Data Source
AI summary
An interpupillary distance adjustment module includes: a first optical module base including a first slider and a first linkage point; a second optical module base including a second slider and a second linkage point; a linkage mechanism including a linkage rod, a third point and a fourth linkage point; and a base including a first groove, a second groove and a shaft, wherein the first and second grooves are parallel to each other and define a groove direction; wherein when a toggle switch rotates the linkage rod, moves the first optical module base, or moves the second optical module base, the third and fourth linkage points and the first and second linkage points are simultaneously linked and moved, and then the first and second optical module bases are controlled to be equidistantly close to or far away from each other in the groove direction.