Rotatable Aspherical Lens Attachment for Continuous Soft Focus Control
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Solution Overview
Problem
Existing image capturing systems cannot continuously control the imaging performance from a resolution state to a blurred state for the background while maintaining the object's resolution, and they do not achieve a sufficient soft focus effect.
Innovation Solution
An attachment optical system with a first and second aspherical lens, where the distance between their surfaces changes by relative rotation around the optical axis, allowing for continuous control of imaging performance from a clear to a blurred state, maintaining object resolution and achieving a soft focus effect.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional aberration variable lens is used to achieve soft focus effect, then the entire screen can be blurred, but it is not possible to perform continuous control from a resolution state to a blurred state with respect to the background while maintaining the resolution state of the object
Solution Approach 1:
The patent employs a rotatable lens unit (fourth lens unit) that can rotate around the optical axis, dynamically changing the air space between lens elements. This rotational movement enables continuous adjustment of spherical aberration, allowing smooth transition from resolved to blurred state for the background while maintaining object resolution, thereby achieving continuous control capability that was missing in conventional fixed-configuration lenses.
Solution Approach 2:
The invention changes the air space parameter between lens elements by rotating the fourth lens unit. This parameter change directly controls the amount of spherical aberration introduced into the optical system. By varying the rotation angle, the air space varies continuously, which in turn continuously adjusts the imaging performance from sharp to softly focused, enabling the desired continuous control range.
2Adaptability or versatility
If the air space of a lens unit is changed to achieve soft focus effect, then a blurred state can be obtained, but it is not possible to maintain the resolution state of the object
Solution Approach 1:
The patent introduces different amounts of spherical aberration for different regions of the optical field by rotating the fourth lens unit. The optical system is designed so that the object region (center) maintains high resolution while the background region (periphery) achieves the desired blur. This local differentiation of imaging quality is achieved through the specific aspherical surface designs and the rotational adjustment mechanism that selectively affects different field regions.
3Device complexity
If a compact and simple configuration is desired, then the number of lens elements should be reduced, but achieving continuous control from resolution to blurred state becomes difficult
Solution Approach 1:
The fourth lens unit serves multiple functions: it acts as a regular focusing element in the optical path and simultaneously serves as a rotational adjustment mechanism for controlling spherical aberration. By making this single lens unit rotatable, the patent achieves continuous imaging performance control without adding separate adjustment mechanisms, thereby maintaining a relatively compact and simple overall configuration while enabling versatile imaging modes.
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
Enables continuous control of imaging performance from a clear to a blurred state for the background while maintaining object resolution, achieving a compact and simple configuration with improved soft focus effect.
Implementation Method 1
a first lens provided with a first aspherical surface including a plurality of concave portions and convex portions that are formed in a rotation direction with respect to an optical system, and a second lens provided with a second aspherical surface including a plurality of concave portions and convex portions that are formed in a rotation direction with respect to the optical axis
Data Source
AI summary
An attachment optical system detachably attached to an image capturing optical system, includes a first lens provided with a first aspherical surface including a plurality of concave portions and convex portions that are formed in a rotation direction with respect to an optical system, and a second lens provided with a second aspherical surface including a plurality of concave portions and convex portions that are formed in a rotation direction with respect to the optical axis, and a distance between the first aspherical surface and the second aspherical surface in an optical axis direction changes by relatively rotating the first lens and the second lens around the optical axis.