Adjustable Headrest Geometry for Precise Ocular Lens Alignment
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Solution Overview
Problem
Teleoperated systems, such as telesurgical systems, face challenges in guiding the user's head and eyes to the optimal position for viewing through display units with restrictive viewing areas, requiring precise alignment of the pupil with the ocular lens or eyepiece assembly, which can be uncomfortable and time-consuming.
Innovation Solution
An adjustable contoured headrest that guides users to position their eyes in three dimensions relative to the display unit's lenses, accommodating various head sizes and shapes, and allowing for movement along the Z-axis to optimize eye positioning, independent of or in conjunction with interpupillary distance adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a static and rigid viewing device is used, then the device structure is simple, but the user must conform their head and body position to the device, causing discomfort and difficulty in maintaining proper viewing position
Solution Approach 1:
The headrest is made adjustable along the Z-axis (optical axis direction) to dynamically adapt to different users and viewing conditions. This allows the headrest to move between retracted and extended positions, enabling users with various head sizes and shapes to achieve proper alignment with the ocular lens while maintaining a comfortable and stable viewing position.
2Measurement precision
If the viewing area is made restrictive with ocular lens or eyepiece assembly, then the viewing precision is improved, but the user experiences discomfort and difficulty in positioning the pupil within the optimal volume
Solution Approach 1:
The headrest serves as an intermediary device between the user and the ocular lens. By providing a contoured support surface that guides the user's head into the correct position, the headrest mediates the alignment process, making it easier for users to position their pupils within the optimal viewing volume of the ocular lens without direct manual adjustment.
Solution Approach 2:
The headrest introduces a new degree of freedom by adjusting along the Z-axis (optical axis direction), which is perpendicular to the traditional X-Y plane adjustments. This Z-axis adjustment provides an additional dimension for positioning, enabling users to achieve proper pupil alignment more easily by moving the headrest toward or away from the ocular lens.
3Adaptability or versatility
If interpupillary distance adjustment is provided, then the adaptability to different users is improved, but the horizontal, vertical, and depth positioning of the eyes relative to the lenses still requires manual adjustment
Solution Approach 1:
The contoured shape of the headrest is designed to automatically guide the user's head into the correct position when they rest their head on it. This self-guiding mechanism eliminates the need for manual adjustment of horizontal, vertical, and depth positioning, allowing users to achieve proper eye alignment through passive placement rather than active adjustment.
Data Source
AI summary
A display unit of a user control system of a telesurgical system includes a support structure, a headrest, and a lens. The headrest is movably connected to the support structure. The lens is below the headrest and includes an optical axis. The headrest is movable to a plurality of positions along a position adjustment axis that is parallel to the optical axis. And, the headrest includes a curved user-facing surface that is shaped to receive a user's head in a way that comfortably aligns the user's eye horizontally and vertically with the optical axis of the lens.