Binocular Optical Layout for Resolution and Chromatic Aberration
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Solution Overview
Problem
Existing binoculars suffer from low resolution and poor user experience due to design deficiencies.
Innovation Solution
An optical system comprising an object lens group, Behan prism group, and eyepiece group arranged along the optical axis, utilizing specific lens configurations and glued connections to reduce chromatic aberration and compact design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a simple lens configuration is used, then the device complexity is reduced, but the resolution and chromatic aberration performance deteriorate
Solution Approach 1:
The objective lens is divided into four separate lenses (first object biconvex lens, second object meniscus lens, third object meniscus lens, fourth object meniscus lens) arranged in sequence along the optical axis. Each lens contributes to correcting specific aberrations, with the combination achieving high resolution and reduced chromatic aberration while maintaining manageable structural complexity through modular design
Solution Approach 2:
Multiple lenses are combined into a single objective lens group with specific spacing and alignment along the optical axis. The eyepiece group similarly combines five lenses working together to achieve the desired magnification and field of view. This merging of multiple optical elements achieves superior performance that would be impossible with a single simple lens
2Measurement precision
If more lenses are added to reduce chromatic aberration, then the resolution improves, but the device complexity increases
Solution Approach 1:
Different lens types with specific properties are placed at specific positions: biconvex lenses for positive focal power at certain positions, meniscus lenses with negative or positive focal power at other positions. Each lens is specifically designed with particular curvature and glass properties to address local aberration issues, achieving comprehensive chromatic aberration reduction through localized optical correction
Solution Approach 2:
The patent employs multiple types of glass materials with different refractive indices and dispersion characteristics for the various lenses. By selecting appropriate glass types for each lens position, the system achieves effective chromatic aberration correction while managing the overall complexity through material optimization rather than simply adding more lenses
3Shape
If traditional prism configurations are used, then the image orientation is correct, but the overall length of the binoculars increases
Solution Approach 1:
The patent employs a Behan prism group consisting of a semi-pentaprism and a roof prism arranged in sequence along the optical axis. This configuration uses the Behan prism principle to achieve image orientation correction while compacting the optical path in the longitudinal dimension, significantly reducing the overall length of the binoculars compared to traditional prism configurations
Solution Approach 2:
The prism group is integrated compactly within the binocular structure, with the semi-pentaprism and roof prism arranged in a space-efficient sequence. The Behan prism configuration allows the prisms to be nested or closely coupled, minimizing the overall length while maintaining proper image orientation and erector function
4Area of stationary object
If the field of view is increased, then the observation capability improves, but the resolution in the center of the field of view may deteriorate
Solution Approach 1:
The fourth lens of the object lens group is designed to be movably arranged along the optical axis, enabling dynamic focusing adjustment. This movable element allows the system to optimize the balance between field of view and central resolution by adjusting the lens position, achieving high resolution in the center of the field of view while maintaining a large field of view through the coordinated action of all lenses
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 binoculars achieve high resolution and large field of view with reduced chromatic aberration, offering a compact and convenient design for improved user experience.
Implementation Method 1
an object lens group, a prism group applying the Behan prism principle, and an eyepiece group arranged in sequence from an object side to an observer's side along an optical axis
Implementation Method 2
the use of multiple sets of glued lenses and low-dispersion glass can greatly reduce chromatic aberration
Implementation Method 3
a prism group applying the Behan prism principle, which includes a semi-pentaprism and a roof prism arranged in sequence from the object side to the observer's side along the optical axis
Implementation Method 4
an eyepiece group including a first eyepiece biconcave lens of a negative focal power, a second eyepiece biconvex lens of a positive focal power, a third eyepiece lens of a positive focal power biconvex type, a fourth eyepiece meniscus lens of a negative focal power, and a fifth eyepiece meniscus lens of a positive focal power
Data Source
AI summary
An optical system of binoculars includes a first object biconvex lens of positive focal power, a second object meniscus lens of negative focal power, a third object meniscus lens of positive focal power, a fourth object meniscus lens of negative focal power, a half pentaprism, a roof prism, a first eyepiece biconcave lens of negative focal power, a second eyepiece biconvex lens of positive focal power, a third eyepiece biconvex lens of positive focal power, a fourth eyepiece meniscus lens of negative focal power, and a fifth eyepiece meniscus lens of positive focal power. These are sequentially arranged along an optical axis direction from an object side to an observation side. When focusing, the fourth object lens moves along the optical axis direction. The binoculars include an exit pupil diameter range of 3.5 mm-4.5 mm, an exit pupil distance range of 15-18 mm, and a field angle range of 6°-6.5°.