Five-Group Zoom Lens for Continuous Mobile-Camera Zoom
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Solution Overview
Problem
Current mobile phone lenses with single focal length and digital zoom suffer from 'jumpy' transitions, leading to lower imaging quality outside the focal length range, as they rely on multiple cameras with different focal lengths for hybrid optical zoom, which is not truly continuous.
Innovation Solution
A zoom lens design with multiple lens groups, including a movable second and fourth lens group, allows for continuous focusing and focal length compensation, enhancing imaging quality by using a combination of fixed and movable lens groups with specific focal powers and movements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple cameras with different focal lengths are used for hybrid optical zoom, then zoom range is extended, but imaging quality deteriorates due to jumpy transitions between focal lengths
Solution Approach 1:
The lens system is divided into multiple lens groups (first through fifth lens groups) with different focal powers, where the second and fourth lens groups are movable while the first, third, and fifth are fixed. This segmentation allows continuous adjustment of focal length through coordinated movement of the movable lens groups, eliminating the jumpy transitions inherent in discrete multi-camera systems while maintaining extended zoom range.
2Manufacturing precision
If the second lens group moves a large distance for focusing, then focusing range is improved, but device height increases
Solution Approach 1:
The movable second lens group is positioned within the optical path between fixed lens groups, and the fourth compensation lens group is nested between the third and fifth lens groups. This nested arrangement allows the movable groups to achieve required focusing and compensation movements without increasing the overall device height, as they operate within the existing optical path boundaries rather than extending the device envelope.
Solution Approach 2:
The fourth lens group serves as a compensation lens group that mediates between the focusing action of the second lens group and the fixed lens groups. When the second lens group moves for focusing, the fourth lens group performs compensatory movements to maintain proper focal length and imaging quality, enabling large focusing strokes without proportionally increasing device height.
3Manufacturing precision
If aspheric surfaces are added to all lenses, then imaging quality is improved, but manufacturing complexity increases
Solution Approach 1:
Aspheric surfaces are applied selectively to specific lens groups based on their optical function and position in the system. The patent specifies that the first, third, and fifth lens groups each include at least one lens with an aspheric surface, while the movable second and fourth lens groups may have spherical or aspheric surfaces depending on their specific optical requirements. This localized application of aspheric surfaces optimizes imaging quality where most needed while reducing manufacturing complexity compared to making all lenses aspheric.
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 continuous zoom with improved imaging quality by ensuring all lens groups have aspheric surfaces and specific focal length ratios, reducing space occupation, and enabling periscopic photographing with reduced height.
Implementation Method 1
all lenses included in the first lens group, the second lens group, the third lens group, the fourth lens group, and the fifth lens group meet the following: N≤a quantity of aspheric surfaces≤2*N
Data Source
AI summary
The technology of this application relates to a zoom lens, a camera module, and a mobile terminal. The zoom lens includes a plurality of lens groups, for example, a first lens group, a second lens group, a third lens group, a fourth lens group, and a fifth lens group that are arranged from an object side to an image side. The first lens group is a lens group with a positive focal power, the second lens group is a lens group with a negative focal power, and the third lens group is a lens group with a positive focal power. The fourth lens group is a lens group with a positive focal power or a negative focal power, and the fifth lens group is a lens group with a positive focal power or a negative focal power.