Bonded Optical Lens Groups for Endoscope Size and Field of View
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Solution Overview
Problem
Endoscope lenses face issues with excessive size, small field of view angle, and insufficient depth of field, leading to discomfort and limited observation capabilities during medical procedures.
Innovation Solution
An optical lens design featuring two lens groups with substrates and lenses bonded together, optimizing focal power and surface shape to achieve a small size, large field of view, and increased depth of field, with a working object distance from 5 mm to infinity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If conventional endoscope lenses are used, then the lens structure is simple, but the lens size becomes excessive causing discomfort to the human body
Solution Approach 1:
The lens is divided into multiple lens groups (first lens group with positive focal power, second lens group with negative focal power) that are bonded together. This segmentation allows each group to contribute specific optical functions while maintaining a compact overall structure, resolving the contradiction between small lens size and structural simplicity.
Solution Approach 2:
Multiple lens elements are merged into bonded lens groups where the first lens, second lens, and third lens are combined with substrates through bonding. This merging approach achieves compact integration of optical functions while managing structural complexity through systematic combination of functional elements.
2Area of stationary object
If conventional endoscope lenses are used, then the lens structure is simple, but the field of view angle becomes small leading to insufficient observation range
Solution Approach 1:
The lens system is segmented into multiple groups with different focal powers (positive and negative), allowing each group to contribute to expanding the field of view. The first lens group with positive focal power and the second lens group with negative focal power work together to achieve a wider observation range while managing structural complexity.
Solution Approach 2:
The lens design utilizes specific focal power parameters and surface shape collocation to optimize the field of view. By carefully selecting and adjusting the focal power of each lens group and their relative configurations, the system achieves an enlarged field of view angle while maintaining manageable structural complexity.
3Area of stationary object
If conventional endoscope lenses are used, then the lens structure is simple, but the depth of field becomes insufficient affecting the observation depth
Solution Approach 1:
The lens is segmented into multiple bonded groups where the first lens group (with positive focal power) and second lens group (with negative focal power) work together to extend the depth of field. This segmentation allows for optimized optical paths that maintain sharp focus across a greater range of distances while managing structural complexity through systematic group configuration.
Solution Approach 2:
The design employs optimized focal power parameters and surface shape characteristics to extend the depth of field. By adjusting the focal power of individual lens groups and their relative positions, the system achieves enhanced observation depth while maintaining the bond structure complexity at acceptable levels.
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 design results in a compact lens with a wide field of view and extended depth of field, enhancing the observation range and clarity for medical endoscopes, addressing the limitations of existing lenses.
Implementation Method 1
an optical lens, which, from an object side to an imaging plane along an optical axis, sequentially includes: a first group, a second group, and protective glass
Data Source
AI summary
The present disclosure discloses an optical lens and a camera module, from an object side to an imaging plane along an optical axis, sequentially including: a first group, a second group, and protective glass. The first group has a positive focal power and sequentially includes, from the object side to the imaging plane along the optical axis, a first substrate and a first lens bonded together. The object side surface or image side surface of the first substrate is coated with a stop. The second group has a negative focal power and sequentially includes, from the object side to the image side along the optical axis, a second lens, a second substrate, and a third lens bonded together. The working object distance of the optical lens is from 5 mm to infinity. The optical lens provided by the present disclosure can reduce the size and diameter of the lens while meeting the requirement of a large field of view angle, effectively increase the depth of field, and well satisfy the needs of endoscopic detection range and observation depth.