Compact Zoom Lens System with Abbe Number Constraints
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Solution Overview
Problem
Interchangeable-lens type digital camera systems require a compact and lightweight zoom lens system that maintains excellent imaging performance, as existing systems are often bulky and heavy, hindering portability and handling.
Innovation Solution
A zoom lens system comprising multiple lens units with specific optical power configurations, where the first lens unit moves along the optical axis during zooming, and the interval between lens units varies for focusing, ensuring compactness and light weight while maintaining optical performance through careful Abbe number and movement conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional zoom lens systems are used in interchangeable-lens type digital camera systems, then imaging performance can be maintained, but the size and weight of the camera system increase
Solution Approach 1:
The zoom lens system is divided into multiple lens units (first lens unit with positive optical power, second lens unit with positive optical power, and at least two subsequent lens units). Each lens unit has specific functions and can move independently during zooming and focusing operations. This segmentation allows for a more compact overall structure while maintaining the required optical performance across the zoom range.
Solution Approach 2:
The patent specifies particular parameters for the lens elements, including Abbe number constraints (|1/vdMIN - 1/vdMAX| < 0.015) and focal length relationships. By carefully controlling these optical parameters and the movement distances of each lens unit, the system achieves compact dimensions without sacrificing imaging quality. The conditional expressions ensure optimal performance while minimizing size.
2Reliability
If conventional zoom lens systems are used in interchangeable-lens type digital camera systems, then imaging performance can be maintained, but the size of the camera system increases
Solution Approach 1:
The zoom lens system is divided into multiple lens units (first lens unit with positive optical power, second lens unit with positive optical power, and at least two subsequent lens units). Each lens unit has specific functions and can move independently during zooming and focusing operations. This segmentation allows for a more compact overall structure while maintaining the required optical performance across the zoom range.
Solution Approach 2:
The patent describes dynamic movement of lens units during zooming and focusing operations. The first lens unit moves along the optical axis during zooming, while the interval between the second lens unit and subsequent lens units varies during focusing from infinity to close-object conditions. This dynamic arrangement enables compact design while maintaining focus accuracy across all distances.
3Reliability
If more lens elements are added to improve imaging performance, then chromatic and spherical aberrations can be reduced, but the lens system becomes heavier and more complex
Solution Approach 1:
The patent applies local quality by specifying that each lens unit contains at least one lens element with negative optical power, while the overall system maintains positive optical power. This local variation in optical properties allows effective correction of chromatic and spherical aberrations within each lens unit without requiring a large number of elements throughout the entire system. The Abbe number constraints ensure proper dispersion characteristics at critical locations.
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 solution achieves a compact and lightweight zoom lens system with superior imaging performance, reducing chromatic and spherical aberrations, and effectively compensating for image blur, thus enhancing the overall camera system's portability and image quality.
Implementation Method 1
a zoom lens system having a plurality of lens units, each lens unit being composed of at least one lens element... the first lens unit is composed of at least three lens elements... each of the first lens unit and the second lens unit includes at least one lens element having negative optical power
Data Source
AI summary
A zoom lens system comprising a positive first lens unit, a positive second lens unit, and at least two subsequent lens units, wherein the first lens unit moves along an optical axis at the time of zooming, an interval between the second lens unit and one of the at least two subsequent lens units varies at the time of zooming or focusing, the first lens unit is composed of at least three lens elements, each of the first lens unit and the second lens unit includes at least one negative lens element, and the conditions: 0.008<(1/vdMIN)−(1/vdMAX)<0.028 and 0.1<|m|/(fT−fW)<0.4 (vdMIN and vdMAX: minimum value and maximum value among Abbe numbers to the d-line of each lens element constituting the first lens unit, m: maximum value among the amounts of movement of each subsequent lens unit at the time of zooming, fT and fW: focal lengths of the entire system at a telephoto limit and at a wide-angle limit) are satisfied; an interchangeable lens apparatus; and a camera system are provided.