Finder Optical System Diffractive Element Aberration Correction
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Solution Overview
Problem
The existing electronic view finder systems face challenges in achieving a wide angle of view while effectively correcting various aberrations and reducing the size of the finder unit, as the number of lenses needed to improve magnification specifications is increased, leading to difficulties in aberration correction.
Innovation Solution
A finder optical system comprising a display element, a diffractive optical element with a close-contact multilayer structure, and multiple lens groups, including a first lens group with positive refractive power, a second lens group with negative refractive power, and a third lens group with positive refractive power, optimized to satisfy specific conditional expressions for focal lengths and Abbe's number differences, allowing for improved aberration correction and reduced size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the number of lenses is increased to achieve a wide angle of view, then the magnification specification is improved, but the size of the finder unit increases and aberration correction becomes difficult
Solution Approach 1:
The patent merges multiple diffractive optical surfaces into a single integrated diffractive optical element with a multilayer structure. The first and second diffractive optical surfaces are formed on different layers that are bonded together, allowing multiple aberration correction functions to be combined in one compact component rather than requiring separate lenses for each function.
Solution Approach 2:
The diffractive optical element uses a composite multilayer structure where a first layer and second layer with different refractive indices and Abbe's numbers are bonded together. Each layer contains diffractive optical surfaces with specific groove patterns, creating a composite optical element that corrects multiple types of aberrations simultaneously while maintaining compact dimensions.
2Adaptability or versatility
If the number of lenses is increased to achieve a wide angle of view, then the magnification specification is improved, but various aberrations become difficult to correct
Solution Approach 1:
The patent merges multiple diffractive optical surfaces into a single integrated diffractive optical element with a multilayer structure. The first and second diffractive optical surfaces are formed on different layers that are bonded together, allowing multiple aberration correction functions to be combined in one compact component rather than requiring separate lenses for each function.
Solution Approach 2:
The diffractive optical element uses a composite multilayer structure where a first layer and second layer with different refractive indices and Abbe's numbers are bonded together. Each layer contains diffractive optical surfaces with specific groove patterns, creating a composite optical element that corrects multiple types of aberrations simultaneously while maintaining compact dimensions.
3Reliability
If a diffractive optical element with multilayer structure is used, then aberration correction is improved, but the manufacturing complexity increases
Solution Approach 1:
The diffractive optical element is segmented into multiple layers, each containing specific diffractive optical surfaces with different groove patterns. This segmentation allows each layer to be optimized for correcting specific types of aberrations, and the layers can be manufactured and then bonded together, managing complexity through modular design.
Solution Approach 2:
The diffractive optical element uses a composite multilayer structure where a first layer and second layer with different refractive indices and Abbe's numbers are bonded together. Each layer contains diffractive optical surfaces with specific groove patterns, creating a composite optical element that corrects multiple types of aberrations simultaneously while maintaining compact dimensions.
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 proposed system achieves a wide angle of view, effectively corrects various aberrations, and reduces the size of the finder unit by utilizing a diffractive optical element and strategically arranged lens groups, enhancing optical performance and compactness.
Implementation Method 1
an optical system disclosed in JP2012-108296A is known as an ocular optical system in the related art. The ocular optical system disclosed in JP2012-108296A can be used in a telescope and binoculars, and is formed using a diffractive optical element.
Implementation Method 2
a finder optical system includes a display element and a diffractive optical element that is disposed on an eye point side of the display element
Data Source
AI summary
A finder optical system includes a display element and a diffractive optical element that is disposed on an eye point side of the display element so as to continue from the display element. The diffractive optical element includes a first base, a first layer that is laminated on the first base and includes a first diffractive optical surface on a surface thereof opposite to the first base, a second base, and a second layer that is laminated on the second base and includes a second diffractive optical surface on a surface thereof opposite to the second base. The first diffractive optical surface and the second diffractive optical surface are in close contact with each other.