Reflective Module Guide Ball Layout for Stable Low-Noise Rotation
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Solution Overview
Problem
Camera modules in mobile devices face issues with driving stability and noise due to the positioning of ball bearings, which can hinder movement and cause noise, especially during optical image stabilization.
Innovation Solution
A reflective module with a housing, rotation guide, and dampers that include pivot and guide balls, along with magnetic support mechanisms, allowing for stable rotation of the reflective member and lens module, enhancing driving stability and reducing noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If ball bearings are positioned to support rotation of the reflective member, then rotation capability is enabled, but driving stability deteriorates and noise increases
Solution Approach 1:
The patent extracts the ball bearing from the traditional bearing structure and repositions it as a guide ball within a guide groove. This transformation removes the harmful noise and instability characteristics of conventional ball bearings while preserving the rotation support function. The guide ball in guide groove configuration eliminates the harmful vibrations and noise associated with traditional ball bearings during optical image stabilization operations.
Solution Approach 2:
The patent introduces a guide groove as an intermediary structure between the housing and the reflective member holder. This guide groove mediates the rotation movement by constraining the guide ball within defined paths, thereby stabilizing the rotation and reducing noise. The guide groove acts as an intermediary mechanism that transforms the raw rotation capability into a stable, low-noise operation.
2Ease of operation
If ball bearings are positioned to enable rotation, then movement is facilitated, but noise is generated during operation
Solution Approach 1:
The patent extracts the noise-generating ball bearing and replaces it with a guide ball system. By removing the traditional ball bearing from the rotation support function and redistributing its function across multiple guide balls in guide grooves, the harmful noise is eliminated while movement facilitation is maintained through the guide groove geometry.
Solution Approach 2:
The patent applies local quality by providing different guide groove configurations at different positions. The guide grooves have varying shapes and orientations tailored to local requirements, with some grooves optimized for rotation and others for positioning. This localized optimization reduces noise at critical locations while maintaining overall movement capability.
3Object-generated harmful factors
If multiple dampers are added to reduce noise, then noise reduction is improved, but device complexity increases
Solution Approach 1:
The guide groove structure serves multiple functions simultaneously: it guides the guide ball during rotation, provides noise reduction through its geometric constraints, and enables stable positioning of the reflective member holder. This multi-functionality eliminates the need for separate dampers and noise-reduction components, thereby reducing overall device complexity while achieving noise reduction.
Solution Approach 2:
The patent merges the guide groove and guide ball system into an integrated assembly that combines positioning, rotation support, and noise reduction functions. By merging these functions into a single coherent structure rather than using separate components for each function, the patent reduces device complexity while achieving the desired noise reduction.
Data Source
AI summary
A reflective module includes a housing having an internal space, a rotation guide disposed in the internal space and configured to rotate about a first axis, relative to the housing, a reflective member holder including a reflective member and supported by the rotation guide, and a damper protruding from a bottom surface of the housing toward the internal space, wherein the damper includes a first damper disposed adjacently to the first axis, and a second damper disposed in a position spaced apart from the first damper.