Optical Imaging Module with Rear-Lens Focusing for Compact Close-Ups
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Solution Overview
Problem
Existing optical imaging modules face challenges in miniaturization and close-range photographing performance due to the need to move whole or front lens groups for focusing, which increases module length and compromises imaging quality.
Innovation Solution
An optical imaging module design that includes a first lens group with positive refractive power and a second movable lens group with negative refractive power, allowing focusing by moving the rear lens group, thus maintaining module length and improving close-range performance by suppressing spherical and coma aberrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the front lens group is moved for focusing, then the imaging clarity is improved, but the overall length of the optical imaging module increases
Solution Approach 1:
The optical imaging module is divided into a first lens group (fixed) and a second lens group (movable). The segmentation allows the focusing function to be isolated to a specific component (second lens group) rather than requiring movement of the entire lens system, thereby resolving the contradiction between achieving clear imaging and maintaining compact module length.
2Length of moving object
If the whole lens groups are moved for focusing, then the module length is maintained, but the close-range photographing performance deteriorates
Solution Approach 1:
The second lens group is specifically designed with local optical characteristics (negative refractive power) to optimize close-range focusing performance. By giving this local component specialized properties rather than moving the entire lens system, the patent achieves both compact module length and superior close-range photographing performance.
3Measurement precision
If a movable lens with negative refractive power is added, then the close-range photographing performance is improved, but the device complexity increases
Solution Approach 1:
The second lens group with negative refractive power serves multiple functions: it enables close-range focusing, corrects spherical and coma aberrations, and maintains compact module dimensions. By designing this single component to fulfill multiple roles, the patent achieves improved close-range performance without proportionally increasing device complexity.
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
The design achieves miniaturization of the optical imaging module while enhancing close-range photographing performance and imaging effects by effectively correcting aberrations and maintaining optical performance across different distances.
Implementation Method 1
a first lens, having a positive refractive power and having a convex object-side surface and a convex image-side surface
Implementation Method 2
a second lens, having a negative refractive power
Implementation Method 3
at least one movable lens configured to focus on objects to be photographed at different distances by moving along the optical axis
Data Source
AI summary
The present disclosure provides an optical imaging module, an optical imaging device and an electronic device. The optical imaging module includes a first lens group and a second lens group arranged in sequence from an object side to an imaging surface. The first lens group has a positive refractive power, and includes a first lens having a positive refractive power and a second lens having a negative refractive power arranged in sequence from the object side to the imaging surface. The first lens includes a convex object-side surface and a convex image-side surface. The second lens group includes a plurality of lenses with refractive power, and the plurality of lenses with refractive power include at least one movable lens configured to focus on objects to be photographed at different distances by moving along the optical axis.