Compact Optical System with Movable Lens for Image Stabilization
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Solution Overview
Problem
Existing telephoto type imaging optical systems with image stabilizing functions face challenges in achieving a large image stabilizing amount while maintaining good optical performance, as increasing the moving amount of the movable unit or refractive power leads to increased eccentric aberration and degraded performance.
Innovation Solution
A compact optical system design featuring a first reflective surface concave toward the object side, a second reflective surface convex toward the image side, and a lens unit between them, with a movable unit that includes at least one of the second optical element and the lens unit, positioned to optimize image stabilizing sensitivity and reduce aberrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the moving amount of the movable unit is increased to enhance correction sensitivity, then the image stabilizing amount is improved, but the eccentric aberration amount increases and optical performance deteriorates
Solution Approach 1:
The optical system is divided into multiple lens units (first through fourth lens units) with different functions. The movable unit is specifically configured as either the second lens unit or a combination of the second and third lens units, allowing independent optimization of stabilization performance and aberration control without requiring the entire system to move.
Solution Approach 2:
The patent optimizes the local properties of the movable unit by selecting specific lens units with appropriate refractive powers and positions. The second lens unit, in particular, is designed with specific optical characteristics that enable effective image stabilization while maintaining acceptable aberration levels during stabilization operations.
2Measurement precision
If the refractive power of the movable unit is increased to enhance correction sensitivity, then the image stabilizing amount is improved, but the eccentric aberration amount increases and optical performance deteriorates
Solution Approach 1:
The patent specifies particular parameter ranges for the movable unit, including the focal length ratios (0.05 < |f2/f| < 0.50 and 0.20 < |f3/f| < 1.00) and the position of the movable unit within the optical system. These parameter optimizations enable effective image stabilization while controlling aberration generation.
3Device complexity
If the movable unit is positioned with low ray height of axial light flux and high position of off-axis principal ray, then the system structure is simplified, but the correction sensitivity is low and eccentric aberration amount is large
Solution Approach 1:
The patent configures the movable unit to move in the optical axis direction during image stabilization, creating a dynamic adjustment mechanism. This dynamic positioning allows the system to achieve high correction sensitivity while maintaining a compact overall structure, as the movement is confined to a specific direction rather than requiring complex multi-axis mechanisms.
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 large image stabilizing amount with improved optical performance by strategically placing the image stabilizing unit to enhance sensitivity and reduce eccentric aberrations, maintaining a compact system size and correcting various aberrations effectively.
Implementation Method 1
a first optical element having a first reflective surface concave toward an object side, a second optical element having a second reflective surface convex toward an image side... Light from an object travels to an image plane through the first reflective surface and the second reflective surface in this order
Data Source
AI summary
An optical system includes a first optical element having a first reflective surface concave toward an object side, a second optical element having a second reflective surface convex toward an image side, and a lens unit disposed between the first optical element and the second optical element. Light from an object travels to an image plane through the first reflective surface and the second reflective surface in this order. A movable unit configured to move during image stabilizing includes at least one of the second optical element and the lens unit.