Variable Focus Camera Lens Measurement for User-Specific Optical Adjustment
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Solution Overview
Problem
Head-mounted devices with fixed lenses often struggle to optimally present visual content to each user due to the difficulty in adjusting the lenses to accommodate individual user needs.
Innovation Solution
A method using a variable focus camera to capture images with and without an intervening lens, determining optical power information for the lens, and calculating spherical and cylindrical powers and axes to adjust the lens for optimal focus.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If fixed shape lenses are used in head-mounted devices, then the device structure is simple, but it is difficult to adjust the lenses to optimally present content to each user
Solution Approach 1:
The patent employs a variable focus camera with a movable lens that can dynamically adjust its focal length to match different user prescriptions. The lens position is controlled by an actuator system that moves the lens along the optical axis, enabling real-time focus adjustment while maintaining a relatively compact device structure through automated control.
Solution Approach 2:
The system changes the optical parameters of the camera by adjusting the lens focal length and position based on measured user prescription data. The controller modifies these parameters automatically after receiving optical power measurements, transforming a static camera into an adaptive optical system that accommodates individual user needs.
2Measurement precision
If variable focus camera is used to measure lens optical power, then precise lens adjustment is achieved, but the measurement process complexity increases
Solution Approach 1:
The system performs self-measurement by capturing images through the user's existing lenses and automatically calculating the optical power using image processing algorithms. The variable focus camera captures images at multiple focal positions, and the controller automatically determines the focal length that produces the sharpest image, eliminating the need for external measurement equipment or manual procedures.
Solution Approach 2:
The system uses feedback from image sharpness analysis to determine the optimal focal length. The controller captures images at different focus positions, analyzes the image quality metrics, and uses this feedback to calculate the user's prescription. This closed-loop measurement process ensures accurate optical power determination while automating the entire procedure.
Data Source
AI summary
An electronic device may include a variable focus camera that is used during lens measurement operations. During the lens measurement operations, the variable focus camera may capture images of one or more targets with and without an intervening lens. Focus information obtained by the variable focus camera may be used to determine the spherical power, the cylindrical power, and the cylindrical axis of the lens. The focus information may be obtained using a frequency sweep while capturing images of a single target. Alternatively, the focus information may be obtained by performing autofocus operations while focusing on different targets. Based on the determined spherical power, cylindrical power, and cylindrical axis of the lens, the electronic device may output lens information using a display, a speaker, or communications circuitry.