Endoscopic Lens Frame Sliding Mechanism for Optical Axis Alignment
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Solution Overview
Problem
Existing stereoscopic endoscopic image capturing devices face challenges in making precise focus adjustments due to the risk of light shield plate deformation and lens frame movement being hindered by the light shield plate, leading to inaccurate optical axis alignment and potential ghosting or flare issues.
Innovation Solution
The design incorporates a first and second objective lens frame with sliding movement, featuring a positioning member such as a rectangular plate or cylindrical rod to maintain optical axis distance precision and prevent adjacent lenses from contacting each other, using a spacer or rod member to accurately position optical members and reduce fitting backlash.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a light shield plate is placed to separate the focusing optical systems, then ghosting and flare are reduced, but the lens frames cannot move smoothly and the light shield plate may deform
Solution Approach 1:
A positioning member is introduced as an intermediary element between the light shield plate and the lens frames. This positioning member enables smooth movement of the lens frames while maintaining the light-shielding function, preventing direct interference between the light shield plate and moving lens components.
Solution Approach 2:
The device is divided into separate functional components: the light shield plate for optical isolation, the positioning member for mechanical guidance, and the lens frames for optical adjustment. This segmentation allows each component to perform its function independently without interfering with others.
2Manufacturing precision
If the lens frames are individually moved for focus adjustment, then focus accuracy is improved, but the light shield plate deforms or prevents smooth movement
Solution Approach 1:
The positioning member acts as a mediator that facilitates the movement of lens frames during focus adjustment without causing deformation to the light shield plate. It provides a guided path that maintains structural integrity while enabling precise positioning.
Solution Approach 2:
The positioning member is pre-installed to define the movement path of the lens frames before focus adjustment begins. This preliminary setup ensures that subsequent movement operations will be smooth and accurate without causing structural damage.
3Ease of operation
If the lens frames are individually moved for focus adjustment, then focus adjustment capability is improved, but optical axis alignment precision deteriorates
Solution Approach 1:
The positioning member serves as a mediator that maintains precise optical axis alignment during focus adjustment operations. It ensures that the lens frames move along the correct trajectory, preserving alignment precision while enabling adjustment capability.
Solution Approach 2:
The system transitions from a static configuration to a dynamic one where lens frames can move for focus adjustment. The positioning member enables this dynamic adjustment while maintaining the precision required for optical axis alignment throughout the movement range.
Data Source
AI summary
The disclosed technology is directed to an endoscopic image capturing device. The image capturing device comprises a first objective lens frame a first lens compartment housing therein first optical members of a first objective optical system and a second lens compartment housing therein second optical members of a second objective optical system that is positioned contiguously with the first objective optical system. A second objective lens frame is disposed for sliding movement with respect to the first objective lens frame in optical axis directions. An image capturing frame is disposed for sliding movement with respect to the second objective lens frame in the optical axis directions and housing therein an image capturing device that has an image capturing surface onto which first and second optical images that has passed through the first and second objective optical systems are focused. A positioning member is disposed in the objective optical system hole.