Camera Module Displacement Identification Layers for Lens Movement Detection
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Solution Overview
Problem
Conventional camera modules face challenges in accurately and efficiently detecting lens movement for autofocusing and optical image stabilization, particularly due to limitations in inductance changes and sensitivity of displacement identification layers.
Innovation Solution
The camera module incorporates a design with multiple displacement identification layers having varying widths and sinusoidal wave-shaped boundaries, arranged to provide complementary effects on inductance changes, combined with sensing coils and magnets for precise lens movement detection, enabling stable and linear detection of lens movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single displacement identification layer is used for lens movement detection, then the device complexity is low, but the measurement precision and sensitivity are insufficient
Solution Approach 1:
The displacement identification layer is divided into multiple segments (first and second displacement identification layers) with different width variations. Each segment responds to lens movement at different sensitivity levels, enabling precise detection across a wider range of movements while maintaining manageable structural complexity.
Solution Approach 2:
The patent introduces a new dimension of differentiation by varying the width of displacement identification layers in the vertical direction (optical axis direction). This dimensional variation allows the system to detect lens movement with different sensitivities, improving measurement precision without simply adding more layers in sequence.
2Measurement precision
If the width of displacement identification layer is uniform, then the manufacturing precision is easy to control, but the detection accuracy and sensitivity range are limited
Solution Approach 1:
Different regions of the displacement identification layer have different widths, creating local quality variations. The first displacement identification layer has a different width profile than the second layer, allowing each region to contribute differently to the overall detection accuracy and sensitivity.
Solution Approach 2:
The patent changes the width parameter of the displacement identification layers to create different detection sensitivities. By controlling the width variations in a systematic way (with specific coordinate relationships), the system achieves high detection accuracy while the width variations follow predictable patterns that facilitate manufacturing.
3Reliability
If displacement identification layers are arranged with overlapping maximum width coordinates, then the device complexity is low, but the inductance changes are not complementary and detection stability is reduced
Solution Approach 1:
The patent introduces asymmetry in the arrangement of displacement identification layers by deliberately offsetting the coordinates of maximum widths between layers. This asymmetric arrangement creates complementary inductance changes that improve detection stability, while the offset follows a specific pattern (1/8 to 3/8 times the coordinate difference) that maintains manufacturing feasibility.
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 design enhances the accuracy and range of lens movement detection, improving autofocusing and optical image stabilization capabilities by stabilizing inductance changes and increasing sensitivity, outperforming traditional methods like hall sensors.
Implementation Method 1
sensing coils arranged such that inductance is changed according to movement of a corresponding displacement identification layer
Implementation Method 2
When a lens module moves, eddy currents are generated in first and second displacement identification layers in accordance with movement of the lens module
Data Source
AI summary
A camera module includes: a lens module including a lens and movably disposed in a housing; a first displacement identification layer disposed on the lens module, configured to move according to movement of the lens module, and having a width varying according to coordinates in one direction in the lens module; and a second displacement identification layer disposed on the lens module, configured to move according to the movement of the lens module, and having a width varying according to the coordinates in the one direction in the lens module. The first and second displacement identification layers are arranged such that a coordinate, among the coordinates in the one direction, corresponding to a maximum width of the first displacement identification layer is different from a coordinate, among the coordinates in the one direction in the lens module, corresponding to a maximum width of the second displacement identification layer.