Variable Power Optical System Lens Movement Mechanism
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Solution Overview
Problem
Conventional variable power optical systems do not achieve optimal optical performance, particularly in terms of refractive power distribution and lens movement mechanisms, which affects image quality and camera shake compensation.
Innovation Solution
A variable power optical system comprising a first lens unit with positive refractive power, a second lens unit with negative refractive power, a third lens unit with positive refractive power, and a fourth lens unit with positive refractive power, where the space between the first and second lens units increases, the space between the second and third lens units decreases, and the space between the third and fourth lens units varies, with the third lens unit moving perpendicular to the optical axis, satisfying specific focal length and axial distance conditions to enhance optical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional variable power optical systems are used, then the basic zoom function is achieved, but optical performance is insufficient
Solution Approach 1:
The optical system is divided into four distinct lens units (G1, G2, G3, G4) with specific refractive power characteristics. The third lens unit G3 is further segmented into a positive power lens group and a negative power lens group that can move independently in the lateral direction, enabling both zooming and camera shake compensation functions through coordinated movement of these segments.
Solution Approach 2:
The patent implements dynamic movement mechanisms where the third lens unit G3 and fourth lens unit G4 move toward the object during zooming from wide-angle to telephoto end. Additionally, the negative power lens group within G3 can move laterally perpendicular to the optical axis for camera shake compensation, creating a dynamically adaptable optical system that maintains excellent performance across different operating states.
2Adaptability or versatility
If lens units are moved to achieve zooming, then focal length variation is achieved, but camera shake occurs
Solution Approach 1:
The negative power lens group within the third lens unit G3 serves as an intermediary element for camera shake compensation. This sub-unit can move laterally perpendicular to the optical axis independently of the main zooming motion, acting as a mediator that counteracts camera shake while the other lens units perform their zooming function along the optical axis.
Solution Approach 2:
The patent introduces lateral movement perpendicular to the optical axis for the negative power lens group in G3, adding a second dimension of motion to the primarily axial zooming movement. This dimensional addition enables camera shake compensation without interfering with the focal length variation achieved through axial movement of the lens units.
3Adaptability or versatility
If multiple lens units are used for zooming, then power variation is achieved, but system length increases
Solution Approach 1:
The optical system employs a nested arrangement where the negative power lens group is embedded within the third lens unit G3, which itself is positioned among other lens units. This nesting allows multiple functional elements to occupy overlapping spatial regions, achieving significant power variation from wide-angle to telephoto end while keeping the overall system length compact.
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 configuration achieves excellent optical performance by improving image quality across wide-angle and telephoto end states, reducing camera shake, and enabling effective aberration correction, while also simplifying the lens movement mechanisms and reducing the overall length of the optical system.
Implementation Method 1
a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, a third lens unit having a positive refractive power, and a fourth lens unit having a positive refractive power
Data Source
AI summary
A variable power optical system ZL is constructed of, in order from the object side, a first lens unit G1 having a positive refractive power, a second lens unit G2 having a negative refractive power, a third lens unit G3 having a positive refractive power, and a fourth lens unit G4 having a positive refractive power. During variation in power from a wide-angle end state to a telephoto end state, a space between the first lens unit G1 and the second lens unit G2 increases, a space between the second lens unit G2 and the third lens unit G3 decreases, and a space between the third lens unit G3 and the fourth lens unit G4 varies, and a part of the third lens unit G3 is configured to move in directions perpendicular to the optical axis.