Camera Module Lens-Sensor Distance Adjustment
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Solution Overview
Problem
Telephoto camera modules face challenges in matching the actual distance between the rear lens and the image sensor with the back focal length (BFL) due to large BFL deviations, making it difficult to achieve high resolution.
Innovation Solution
A camera module design that includes a lens module, a substrate, a support member, and adhesive members to adjust the distance between the lens module and the image sensor, allowing for precise alignment and adjustment of the optical axis, with features like grooves and protrusions for secure coupling and movement guidance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a telephoto camera module is designed with a fixed lens-to-sensor distance, then the manufacturing process is simple, but the actual distance cannot match the back focal length due to large BFL deviation, resulting in poor resolution
Solution Approach 1:
The lens module is designed with a movable structure that allows adjustment of the distance between the lens and image sensor along the optical axis. The lens module can be positioned at different locations relative to the image sensor to achieve the required back focal length, transforming a static fixed-distance structure into a dynamic adjustable-distance structure.
Solution Approach 2:
The camera module is divided into separate components: the lens module, the image sensor, and a support member. The lens module can be independently adjusted relative to the image sensor, allowing precise control of the lens-to-sensor distance to match the back focal length requirement.
2Measurement precision
If the lens module is made adjustable to match BFL, then resolution is improved, but the assembly process becomes more complex
Solution Approach 1:
A guide protrusion is provided on the lens module that fits into a guide groove on the support member before final adhesive bonding. This preliminary mechanical guidance ensures correct positioning and alignment during assembly, making the adjustment process easier and more accurate before the adhesive sets.
Solution Approach 2:
The guide protrusion and guide groove act as intermediary mechanical elements that facilitate precise positioning of the lens module relative to the support member and image sensor during assembly, enabling accurate distance adjustment without requiring complex alignment tools or procedures.
Data Source
AI summary
A camera module includes a lens module to accommodate a lens; a substrate; an image sensor disposed on the substrate; a support member coupled to the lens module to define a gap between the image sensor and the lens module; a first adhesive member fixing a location of the support member with respect to the substrate; a second adhesive member fixing a location of the lens module with respect to the support member; a first housing coupled to the lens module; and a second housing to accommodate the substrate and coupled to the first housing.