Objective Lens Changer Using Kinematic Linkage for Repeatable Switching
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Solution Overview
Problem
Existing objective lens changers in microscopes require transverse movement near the object when switching lenses, which can be disruptive and lack repeatability, especially for high magnification objectives.
Innovation Solution
An objective lens changer that moves lenses along the optical axis before switching, using a kinematic design with mechanical linkages and motors to ensure precise and repeatable positioning without transverse movement near the object, utilizing lever arms and kinematic balls for accurate alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional objective lens changers are used, then lens switching is achieved, but transverse movement near the object occurs which disrupts imaging and reduces repeatability
Solution Approach 1:
The patent changes the movement dimension from transverse (lateral) to longitudinal (along optical axis). The objective lens carrier moves along the optical axis toward and away from the object, eliminating transverse movement near the object. This dimensional change resolves the contradiction by removing the harmful transverse disruption while maintaining reliable lens switching capability.
Solution Approach 2:
The patent implements preliminary action by moving the objective lens carrier along the optical axis before the actual lens switching operation. The carrier is positioned to move toward the object, then the lens is switched, and finally the carrier moves back. This preliminary positioning and movement sequence eliminates transverse movement during the critical imaging phase, improving both reliability and reducing harmful disruptions.
2Adaptability or versatility
If turret rotation is used for lens changing, then multiple lenses can be selected, but mechanical complexity increases and repeatability decreases
Solution Approach 1:
The patent segments the lens changing mechanism into independent functional components: an objective lens carrier holding multiple lenses, a positioning mechanism with kinematic balls and V-shaped grooves, and a drive system. This segmentation allows each component to perform its specific function with simplicity, reducing overall mechanical complexity while maintaining the ability to select from multiple lenses.
Solution Approach 2:
The patent replaces complex rotational mechanical systems with a linear positioning system using kinematic balls and V-shaped grooves. Instead of rotating a turret, the system uses ball-bearing guided linear movement along the optical axis, substituted with a simpler linear actuation mechanism that improves repeatability and reduces mechanical complexity while maintaining lens selection versatility.
3Ease of operation
If transverse movement is used during lens switching, then lens position can be changed, but mechanical stress increases and precision decreases
Solution Approach 1:
The patent changes the movement dimension from transverse to longitudinal, aligning the movement with the optical axis rather than perpendicular to it. This dimensional change eliminates transverse mechanical stress on the object and imaging system, while the linear guidance along the optical axis provides superior positioning precision through the kinematic ball and V-groove mechanism.
Data Source
AI summary
The subject matter of the present disclosure generally relates to objective lens changers for optical instruments. In one embodiment, an objective lens changer includes an objective lens carrier moveably attached to a changer frame by a mechanical link arrangement. The objective lens carrier includes two or more objective lens positions. The mechanical link arrangement includes a first link section to provide translation of the objective lens carrier between the objective lens positions and a second link section arranged to control an alignment of the objective lens position with respect to the optical axis of the optical instrument.