Zoom Projection Lens With Movable Power-Differentiated Groups
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Solution Overview
Problem
Existing zoom projection lenses suffer from uneven distribution of focal power among lens groups, leading to poor imaging quality due to field curvature and distortion issues.
Innovation Solution
A zoom projection lens design comprising a first zoom lens group with positive focal power, a second zoom lens group with negative focal power, and a compensation lens group with positive focal power, all of which are movable along the optical axis, with specific air gaps and focal lengths optimized to ensure consistent imaging quality across the zoom range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the distribution of focal power among lens groups is uneven, then the zoom function can be achieved by adjusting relative positions, but the imaging quality deteriorates due to field curvature and distortion
Solution Approach 1:
The patent applies local quality by assigning different focal power characteristics to different lens groups. Specifically, the first lens group has positive focal power for zooming, the second lens group has negative focal power for correction, and the third lens group has positive focal power for additional zooming. This localized differentiation of optical properties enables simultaneous achievement of zoom function and image quality maintenance.
Solution Approach 2:
The patent segments the lens system into three distinct lens groups with specific focal power distributions. By dividing the lens system this way, each group can be optimized for its specific function: the first group provides initial zooming, the second group corrects aberrations, and the third group provides additional zooming capability. This segmentation resolves the contradiction by allowing independent optimization of each segment.
2Manufacturing precision
If more lens groups are added to improve imaging quality, then field curvature and distortion can be corrected, but the device complexity increases
Solution Approach 1:
Instead of adding more lens groups uniformly, the patent applies local quality by strategically placing lens groups with specific focal power characteristics at critical positions. The second lens group with negative focal power is positioned between the first and third groups to specifically address field curvature and distortion, providing targeted correction without requiring a complete redesign of the entire lens system.
Solution Approach 2:
The patent employs dynamic movement of lens groups along the optical axis to achieve zooming. The first, second, and third lens groups can move independently to adjust their relative positions, enabling the system to adapt to different focal lengths while maintaining image quality. This dynamic capability reduces the need for additional fixed lens groups.
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 a high zoom ratio of 1.5×, maintains consistent light intake and brightness, reduces manufacturing costs, and ensures low distortion and high resolution throughout the focal length range.
Implementation Method 1
a first zoom lens group with positive focal power, a second zoom lens group with negative focal power, and a compensation lens group with positive focal power, all of which are movable along the optical axis
Data Source
AI summary
The present disclosure provides a zoom projection lens and an electronic device. The zoom projection lens includes: a first zoom lens group, a second zoom lens group, a compensation lens group, and a fixed lens group, sequentially along an optical axis direction from a zoom-in side to a zoom-out side; the first zoom lens group has a positive focal power, the second zoom lens group has a negative focal power, the compensation lens group has a positive focal power, and the fixed lens group has a positive focal power; and the first zoom lens group, the second zoom lens group, and the compensation lens group are movable along the optical axis.