Camera Module IC Layout for Two-Axis Lens Position Sensing
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Solution Overview
Problem
Existing camera modules using magnetic sensors for lens positioning are limited in their ability to accurately detect and control the position of a lens in multiple directions, leading to inefficiencies and potential image blur due to vibration.
Innovation Solution
A camera module design that utilizes a movable body with magnetic drive units and integrated position sensing, allowing precise control and detection of the lens position in two orthogonal directions using a single IC chip, reducing component count and module size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If magnetic sensors are used to detect lens position, then position detection capability is provided, but the ability to accurately detect and control lens position in multiple directions is limited
Solution Approach 1:
The patent combines multiple magnetic sensors (first and second magnetic sensors) into a single position detection unit that can detect lens positions in multiple directions simultaneously. This merging approach enables multi-directional detection capability while maintaining detection accuracy, resolving the contradiction between measurement precision and adaptability.
Solution Approach 2:
The position detection unit is designed with universal capability to detect lens positions in both first and second directions (orthogonal directions) using the same magnetic sensor system. This multi-functional design allows a single detection unit to handle multiple detection tasks, improving adaptability without sacrificing precision.
2Reliability
If separate components are used for position sensing and drive control, then functional independence is achieved, but component count and module size increase
Solution Approach 1:
The patent integrates the position detection unit and drive unit into a single integrated circuit chip. The position detection unit includes magnetic sensors that detect lens position, while the drive unit includes drive coils that control lens movement. By merging these functions into one chip, the patent reduces component count and module size while maintaining functional independence through internal modular architecture.
Solution Approach 2:
The integrated circuit chip performs multiple functions: it includes both position detection capabilities (through magnetic sensors) and drive control capabilities (through drive coils). This multi-functional integration eliminates the need for separate components, reducing device complexity while preserving functional independence through internal separation of detection and actuation pathways.
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 stabilization and autofocus capabilities by accurately controlling lens position in multiple directions, reducing blur and improving image quality.
Implementation Method 1
A camera module that uses a magnetic sensor to detect a position of a lens is known
Implementation Method 2
A camera module design that utilizes a movable body with magnetic drive units and integrated position sensing, allowing precise control and detection of the lens position in two orthogonal directions
Data Source
AI summary
There is provided a camera module including: a movable body including an optical element; a fixed portion having a surface facing the movable body in a direction intersecting an optical axis of the optical element; a first drive unit having a portion arranged on a first surface of the movable body, for generating a first driving force for moving the movable body in a first direction; a second drive unit having a portion arranged on a second surface of the movable body different from the first surface, for generating a second driving force for moving the movable body in a second direction intersecting the first direction; and a position sensing unit arranged on a surface of the fixed portion facing the first surface of the movable body, or on the first surface of the movable body, for detecting positions in the first and second directions of the movable body.