Smartphone Optical Unit with Magnetic Alignment
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Solution Overview
Problem
Conventional optical assemblies in smartphones face issues with image blur due to camera shake, particularly because the magnet and yoke components can shift from their predetermined positions due to manufacturing tolerances in resin-molded recesses, leading to instability in the reflection module.
Innovation Solution
The optical assembly includes a holder with an optical element that reflects light, a support mechanism with a swing axis, and magnetic components that overlap to maintain alignment, utilizing a preload assembly to prevent displacement and ensure accurate image correction by allowing the optical element to swing about two axes, thereby stabilizing the image.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the magnet and yoke are attached to the recesses of the holder and housing formed by resin molding, then the device complexity is reduced and ease of manufacture is improved, but the manufacturing precision deteriorates causing displacement from predetermined positions
Solution Approach 1:
A positioning protrusion is introduced as an intermediary element between the magnet/yoke and the recesses. This protrusion fits into the recesses to provide precise positioning, while the magnet and yoke are attached to this positioning structure. This resolves the contradiction by enabling both easy resin molding of recesses and precise positioning of magnetic components.
2Device complexity
If the magnet and yoke are attached to the recesses of the holder and housing, then the device structure is simplified, but the reliability deteriorates due to position shifts caused by tolerance
Solution Approach 1:
The positioning protrusion is designed to preliminarily establish the correct position of the magnet and yoke before final attachment. By pre-positioning the magnetic components through the protrusion-recess fit, the system ensures reliable alignment is achieved before the magnet and yoke are permanently fixed, preventing position shifts during operation.
3Ease of manufacture
If minute recesses are formed by resin molding to accommodate magnet and yoke, then the ease of manufacture is improved, but the manufacturing precision deteriorates due to tolerance in the recess
Solution Approach 1:
The attachment structure is segmented into three functional parts: the recesses formed by resin molding (easy manufacture), the positioning protrusion (provides precision), and the magnet/yoke components. This segmentation allows each part to optimize its function - the recesses are easy to mold, while the protrusion ensures precise positioning, resolving the contradiction between ease of manufacture and manufacturing precision.
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
This configuration effectively prevents image blur by ensuring precise alignment and stability of the optical element, improving correction accuracy compared to systems that only swing about one axis.
Implementation Method 1
an optical element that reflects light traveling to one side in a first direction to one side in a second direction intersecting the first direction
Implementation Method 2
a first magnet on any one of the holder, the support, and the fixed body, and a first magnetic body on another one of the holder, the support, and the fixed body. At least portions of the first magnet and the first magnetic body overlap each other
Data Source
AI summary
An optical assembly includes a holder on which an optical element that reflects light traveling to one side in a first direction to one side in a second direction intersecting with the first direction is mounted, a support that supports the holder, a fixed body that supports the support, a first swing mechanism that swings the support about a first swing axis with respect to the fixed body, a first magnet on any one of the holder, the support, and the fixed body, and a first magnetic body on another one of the holder, the support, and the fixed body. At least portions of the first magnet and the first magnetic body overlap each other when viewed from any one of the first direction, the second direction, and a third direction intersecting with each of the first direction and the second direction.