Endoscope Stereoscopic Lens System for Reduced Eyestrain
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Solution Overview
Problem
Conventional stereoscopic vision optical systems for endoscopes face challenges in achieving an optimal inward angle for stereoscopic effect, leading to inadequate imaging and eyestrain during prolonged use, especially in proximity observations.
Innovation Solution
The optical system comprises a first lens group with negative refractive power, a second lens group with positive refractive power, and a rear-side lens group, where the optical axes of these groups are aligned and positioned to satisfy specific conditional expressions, allowing for adjustable focusing and optimal inward angle settings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If a pair of optical systems is disposed in parallel to capture stereoscopic images, then stereoscopic information can be acquired, but the inward angle becomes excessively large causing eyestrain
Solution Approach 1:
The optical system is divided into two separate optical systems (first optical system and second optical system) disposed in parallel, each capturing images for one eye. This segmentation enables stereoscopic vision while controlling the inward angle to reduce eyestrain during prolonged use
Solution Approach 2:
The patent optimizes the inward angle parameter by carefully positioning the two optical systems at a specific distance apart. This parameter control ensures that light rays from the same object point intersect at an appropriate angle, providing comfortable stereoscopic vision without excessive inward angle that would cause eyestrain
2Loss of information
If the inward angle is increased to enhance stereoscopic effect, then stereoscopic vision is improved, but image quality deteriorates due to excessive convergence
Solution Approach 1:
The patent optimizes the inward angle parameter by carefully positioning the two optical systems at a specific distance apart. This parameter control ensures that light rays from the same object point intersect at an appropriate angle, providing comfortable stereoscopic vision without excessive inward angle that would cause eyestrain
3Measurement precision
If magnified observation is implemented by moving the object point from far point to near point, then tissue detail is improved, but the focus range becomes limited
Solution Approach 1:
The patent implements a movable lens group that can be positioned at different locations along the optical axis. This dynamic adjustment capability enables the optical system to maintain focus across a wider range of object distances, allowing both magnified near-point observation and far-point observation without losing focus capability
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 enables an appropriate stereoscopic effect without excessive inward angle, reducing eyestrain and allowing for sharper imaging of tissues during both near-point and far-point observations.
Implementation Method 1
a first lens group having a negative refractive power, a second lens group having a positive refractive power
Data Source
AI summary
A stereoscopic vision optical system includes a first lens group having a negative refractive power, disposed nearest to an object, a second lens group having a positive refractive power, and a rear-side lens group having a positive refractive power. The rear-side lens group includes a first rear group and a second rear group. The optical axis of the first lens group, an optical axis of the first rear group, and an optical axis of the second rear group is positioned on the same plane. The optical axis of the first lens group is positioned between the optical axis of the first rear group and the optical axis of the second rear group, and the following conditional expression (1) is satisfied:0.08≤((−L/2)×(f1/f2))×(1/WD)≤0.25 (1).