Lens Drive Unit With Multi-Shaft IPD Adjustment
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Solution Overview
Problem
Existing wearable devices with adjustable lenses face challenges in efficiently adjusting the distance between lenses to accommodate varying inter-pupillary distances, leading to user discomfort and difficulty in visual recognition of displayed information.
Innovation Solution
A driving unit comprising a motor, first and second shafts, and connecting structures that rotate to adjust the distance between lenses, allowing for precise alignment with the user's eyes, while minimizing the device's size and complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a driving unit is added to adjust lens distance, then adaptability to different IPD is improved, but device complexity increases
Solution Approach 1:
The driving unit is segmented into multiple shafts (first shaft, second shaft, third shaft) with distinct functions: the first shaft rotates the first barrel, the second shaft rotates the second barrel, and the third shaft adjusts the distance between barrels. This segmentation allows each component to perform a specific function, making the overall system more adaptable to different IPD while keeping individual components simple and manageable.
2Manufacturing precision
If multiple shafts are used to adjust lens distance, then lens positioning precision is improved, but device complexity increases
Solution Approach 1:
The first shaft acts as an intermediary that rotates to drive both the second shaft and third shaft through mechanical connection. This intermediary mechanism allows precise control of the first barrel's rotation, which in turn precisely positions the second and third barrels, achieving high lens positioning precision while using a coordinated multi-shaft system rather than independent complex mechanisms.
3Volume of moving object
If the driving unit structure is made compact, then device size is reduced, but adjustment range may be limited
Solution Approach 1:
The shafts and barrels are arranged in a nested configuration where the first shaft is positioned between the second and third shafts, and the barrels are arranged along the optical axis with overlapping or adjacent positions. This nesting allows the driving unit to achieve a wide adjustment range for IPD while maintaining a compact overall device size, as the components are space-efficiently packed rather than spread out.
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
The solution enables effective adjustment of lens distance for improved visual recognition and user comfort, reducing dizziness and physical tension by aligning light emission with the user's pupils, while maintaining a compact device design.
Implementation Method 1
a second shaft including a first screw thread and configured to rotate by a rotation of the first shaft, a third shaft including a second screw thread having a direction opposite to a direction of the first screw thread
Data Source
AI summary
An electronic device includes: a first barrel including a first lens; a second barrel including a second lens spaced apart from the first lens in a first direction; and a driving unit between the first lens and the second lens, the driving unit being configured to adjust a distance between the first lens and the second lens. The driving unit includes: a motor, a first shaft to rotate by a rotation of the motor, a second shaft to rotate, by a rotation of the first shaft, to move the first barrel in the first direction or a second direction, and a third shaft to rotate, by the rotation of the first shaft, to move the second barrel in the second direction or the first direction.