Camera Module Inner-Focus Lens Barrel Guide Mechanism
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Solution Overview
Problem
Existing camera modules with whole-group extension types face challenges in downsizing and slimming down due to the requirement for large clearance distances between lenses and reflective elements, leading to increased thickness and footprint.
Innovation Solution
The camera module incorporates a design with a first and second lens barrel, a lens driving unit, and a guide system using balls and guide recesses to achieve inner-focus functionality, allowing for precise alignment and adjustment of lens groups without the need for extensive clearance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If whole-group extension type is used to achieve telephoto lens functionality, then optical performance is improved, but camera module size increases
Solution Approach 1:
The lens system is segmented into a fixed first lens group and a movable second lens group. The second lens group can be driven independently along the optical axis to achieve telephoto functionality, eliminating the need for whole-group extension. This segmentation allows the camera module to maintain compact size while achieving the desired optical performance.
Solution Approach 2:
The second lens group is made dynamically movable along the optical axis through a driving mechanism. This dynamic adjustment allows the lens system to achieve telephoto functionality without permanent extension of the entire lens barrel, thus maintaining a compact camera module structure.
2Volume of moving object
If inner focus is used to drive only some lenses, then camera module size is reduced, but manufacturing precision requirement increases
Solution Approach 1:
A guide structure with guide recesses and guide balls is introduced as an intermediary mechanism to control the movement of the second lens group. This guide structure ensures precise alignment and movement control, reducing the manufacturing precision requirements for direct lens center alignment while maintaining compact camera module size.
3Measurement precision
If clearance distance is increased between lenses and reflective element, then optical performance is maintained, but camera module thickness increases
Solution Approach 1:
The optical system is segmented into distinct first and second lens groups with the second group being movable. This segmentation allows for optimized spacing between lenses and the reflective element, maintaining optical performance while minimizing the required clearance distance and overall camera module thickness.
Data Source
AI summary
A camera module comprises a first lens barrel holding a first lens group configured to receive object light; a second lens barrel holding a second lens group disposed in a traveling direction of the object light with respect to the first lens group; a lens driving unit configured to drive the second lens barrel in a first direction along a first optical axis of the second lens group; and a guide for guiding a direction in which the second lens barrel is driven, wherein the first lens barrel has a first guide recess fitted in the guide, the second lens barrel has a second guide recess fitted in the guide, one of the first guide recess and the second guide recess fixes the guide in the first direction, and the guide slides in the first direction with respect to another of the first guide recess and the second guide recess.