Finder Optical System Variable Magnification Compact Design
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Solution Overview
Problem
Existing optical finder systems face challenges in achieving high magnification while maintaining a compact size, as they often require larger optical systems to achieve sufficient image quality and magnification.
Innovation Solution
The proposed finder system incorporates a variable magnification optical system with a combination of objective and ocular optical systems, including reflecting surfaces and prisms, which form an intermediate image and provide erect images, while satisfying specific conditional expressions to optimize size and performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional optical finder system uses larger optical systems to achieve sufficient image quality and magnification, then image quality is improved, but the size of the optical system increases
Solution Approach 1:
The optical system is divided into multiple lens groups (first through fourth lens groups) with different functions. The first lens group has positive refractive power and includes a stop, the second has negative refractive power, the third has positive refractive power, and the fourth has negative refractive power. This segmentation allows each group to be optimized for specific functions, achieving high image quality while keeping individual group sizes compact.
Solution Approach 2:
The patent implements variable magnification capability through dynamic adjustment of lens group positions. The second and fourth lens groups move along the optical axis to change magnification, allowing the system to adapt between wide-angle and telephoto modes. This dynamic configuration enables high magnification when needed while maintaining compact size in normal operation.
2Measurement precision
If a conventional optical finder system increases magnification, then optical finder magnification is improved, but the size of the optical system increases
Solution Approach 1:
The system achieves variable magnification through dynamic movement of the second and fourth lens groups along the optical axis. When these groups move to specific positions, the magnification changes from wide-angle to telephoto mode. This dynamic adjustment allows high magnification to be achieved only when needed, rather than requiring a permanently large optical system.
Solution Approach 2:
The patent changes optical parameters (refractive powers, focal lengths, and distances between lens groups) to achieve different magnification levels. By adjusting the positions of lens groups and changing the effective focal length of the system, high magnification is achieved through parameter optimization rather than simply increasing 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
This configuration allows for higher optical finder magnification while minimizing the size of the optical system, enabling efficient diopter adjustment and improved image quality through precise control of lens positions and refractive powers.
Implementation Method 1
an objective optical system that includes, in order from an object side to an eye point side along an optical path, at least one lens and forms an intermediate image
Implementation Method 2
an ocular optical system that includes at least one lens and is provided for observation of the intermediate image
Implementation Method 3
the finder includes a plurality of reflecting surfaces for forming an erect image, each of the objective optical system and the ocular optical system has at least one of the plurality of reflecting surfaces
Data Source
AI summary
A finder includes, in order from an object side to an eye point side, an objective optical system that forms an intermediate image, and an ocular optical system that is provided for observation of the intermediate image. The intermediate image is positioned on the optical path between the objective optical system and the ocular optical system. The finder includes a plurality of reflecting surfaces for forming an erect image, and each of the objective optical system and the ocular optical system has at least one of the plurality of reflecting surfaces. The finder satisfies a conditional expression: 2<fo/fe<8 regarding a focal length fo of the objective optical system and a focal length fe of the ocular optical system.