Tilt Imaging Lens Layout for Composition Shift and Aberration Control
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Solution Overview
Problem
Existing imaging optical systems with tilt mechanisms suffer from composition shifts and increased aberrations due to decentering, making it difficult to incline the object plane for broad image expression, particularly when focusing on inclined planes.
Innovation Solution
An optical system with a configuration of lens units, including a first and third lens unit moving perpendicular to the optical axis and a second lens unit stationary, to minimize composition shifts and correct aberrations during tilt image-capturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If lens units are moved in a direction perpendicular to the optical axis to correct composition shift, then composition shift is reduced, but decentering aberration increases
Solution Approach 1:
The optical system divides lens units into multiple groups (first through fourth lens units) with different movement characteristics. The first and third lens units move perpendicular to the optical axis for composition shift correction, while the second and fourth lens units remain stationary or move differently, segmenting the correction function across specific groups to minimize overall decentering aberration
Solution Approach 2:
Different lens units are assigned different refractive powers and movement characteristics based on their local function. The first lens unit has positive refractive power and moves for composition correction, while the second lens unit has negative refractive power and remains relatively stationary, creating local quality differences that optimize both composition shift correction and aberration control
2Adaptability or versatility
If the inclination amount of the object plane is increased to broaden image expression, then the range of image expressions is broadened, but decentering aberration increases
Solution Approach 1:
The optical system enables dynamic adjustment of the object plane inclination through controlled movement of the first and third lens units perpendicular to the optical axis. This dynamic mechanism allows the system to adapt to different inclination requirements while maintaining aberration control through the coordinated movement of multiple lens groups with different refractive powers
3Illumination intensity
If the diameter of lens unit B is increased to accommodate higher off-axis light height, then off-axis light can be handled, but the system size increases
Solution Approach 1:
Instead of increasing the diameter of a single lens unit to handle off-axis light, the system uses the fourth lens unit positioned closer to the image plane to refract and redirect off-axis light rays. This dimensional repositioning allows off-axis light to be handled effectively without requiring larger lens diameters in the earlier lens units, thus controlling the overall system size
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 system allows for extensive inclination of the object plane while reducing mechanical complexity and aberrations, facilitating efficient tilt image-capturing with minimal system size and improved optical performance.
Implementation Method 1
a first lens unit having a positive refractive power, a second lens unit having a positive refractive power, and a third lens unit having a negative refractive power which are arranged in order from an object side
Data Source
AI summary
An optical system configured to perform tilt image-capturing includes an object-side lens unit, a first lens unit having a positive refractive power, a second lens unit having a positive refractive power, and a third lens unit having a negative refractive power which are arranged in order from an object side. The first lens unit and the third lens unit move in a direction including a component of a direction perpendicular to an optical axis for tilt image-capturing. The object-side lens unit and the second lens unit do not move in a direction including a component of a direction perpendicular to the optical axis for tilt image-capturing.