Zoom Lens Barrel Diametral Dimension Reduction via Anti-Vibration Group
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Solution Overview
Problem
Existing compact zoom lenses face challenges in downsizing the lens barrel while maintaining high-performance imaging, as the displacement of lens groups to vary magnification complicates the barrel design and increases dimensions, and the anti-vibration lens mechanism is not sufficiently downsized.
Innovation Solution
A zoom lens design with three or more lens groups, including a first positive refractive power group, a second negative refractive power group, and a third positive refractive power group, where all or part of the negative refractive power groups are moved normal to the optical axis to serve as an anti-vibration lens, meeting specific focal length and displacement requirements to reduce the lens barrel's diametral dimension and simplify the structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If lens groups are displaced to vary magnification, then zoom functionality is achieved, but lens barrel diametral dimension increases and structure becomes complicated
Solution Approach 1:
The patent moves the anti-vibration lens group in the optical axis direction (longitudinal dimension) instead of only in directions normal to the optical axis (lateral dimension). This dimensional change allows the lens group to serve dual purposes: varying magnification through axial displacement and anti-vibration through lateral displacement, thereby reducing the lens barrel's diametral dimension while maintaining zoom functionality.
2Adaptability or versatility
If lens groups are displaced to vary magnification, then zoom functionality is achieved, but barrel structure becomes complicated
Solution Approach 1:
The patent designs the second lens group with negative refractive power to serve dual functions: it acts as both a zoom lens group for varying magnification and an anti-vibration lens group for shifting the image. By making one lens group perform multiple functions, the barrel structure is simplified compared to having separate dedicated groups for each function.
Solution Approach 2:
The patent combines the zoom function and anti-vibration function into a single lens group (the second lens group). This merging of functions reduces the number of separate mechanisms required, thereby simplifying the overall barrel structure while maintaining both zoom and anti-vibration capabilities.
3Area of stationary object
If anti-vibration lens is downsized, then lens barrel diameter is reduced, but anti-vibration effectiveness may be compromised
Solution Approach 1:
The second lens group serves dual purposes as both a zoom lens group and an anti-vibration lens group. By utilizing the refractive power of this lens group for both magnification variation and image shifting, the design achieves effective anti-vibration functionality without requiring a separate dedicated anti-vibration lens, thus avoiding the need to compromise effectiveness for downsizing.
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 high-performance imaging with reduced lens barrel dimensions, improved aberration compensation, and simplified barrel structure, while maintaining effective anti-vibration functionality.
Implementation Method 1
the second lens group G2 of negative refractive power
Implementation Method 2
the first lens group G1 of positive refractive power, the succeeding second lens group G2 of negative refractive power, the third lens group G3 of positive refractive power
Data Source
AI summary
A zoom lens has in order from the object side, at least a foremost, first lens group having positive refractive power, a succeeding, second lens group having negative refractive power, a third lens group having positive refractive power, and a rearmost lens group having negative refractive power. The zoom lens meets requirements as defined in formulas regarding a displacement of the first lens group, a focal length of the zoom lens at the wide-angle end, a focal length of the zoom lens at the telephoto end, a focal length of the first lens group, and a focal length of the third lens group.