Rotating Light Deflector for Adaptive Pupil Measurement
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Solution Overview
Problem
Existing eye refractive power measurement apparatuses are unable to adjust their measurement range to accommodate varying pupil diameters, limiting their ability to accurately measure refractive power across different ambient brightness conditions.
Innovation Solution
The apparatus includes a light deflecting member, such as a prism, that can be rotated to change the eccentricity of the measurement light on the pupil, allowing for adjustment of the measurement region to accommodate both smaller and larger pupil diameters, enabling accurate refractive power measurement in various lighting conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed measurement optical system is used, then the apparatus structure is simple, but it cannot accommodate varying pupil diameters in different lighting conditions
Solution Approach 1:
The patent applies the dynamics principle by making the measurement optical system movable relative to the examinee's eye. The optical system can be shifted along the optical axis to adjust the measurement region on the pupil, allowing adaptation to different pupil diameters. This dynamic adjustment capability enables the system to maintain measurement accuracy whether the pupil is small (bright conditions) or large (dark conditions) without requiring complete redesign of the optical architecture.
2Measurement precision
If the measurement region is fixed on the pupil, then the optical system is simple, but it cannot accurately measure refractive power across different ambient brightness conditions
Solution Approach 1:
The patent implements self-service by automatically controlling the movable optical system to adjust the measurement region based on detected pupil diameter. The system autonomously determines the appropriate measurement region and shifts the optical system accordingly, eliminating the need for manual intervention. This automatic adaptation ensures measurement precision across varying lighting conditions while keeping the operation simple for the user.
3Adaptability or versatility
If a single optical system is used for all measurement conditions, then the device structure is simple, but it cannot optimize measurement for both small and large pupil diameters
Solution Approach 1:
The patent applies universality by designing a single optical system that can perform multiple measurement functions by adjusting its position. The movable optical system can measure refractive power for both small pupils (bright conditions) and large pupils (dark conditions) using the same hardware components. This multi-functional capability allows one system to adapt to various measurement conditions while maintaining high precision through optimal positioning for each condition.
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 solution allows for precise measurement of refractive power in both smaller and larger pupil diameters, enhancing the accuracy and adaptability of the apparatus to different environmental conditions.
Implementation Method 1
a light deflecting member, such as a prism, that can be rotated to change the eccentricity of the measurement light on the pupil
Data Source
AI summary
An eye refractive power measurement apparatus includes: a measuring optical system for projecting measurement light onto a fundus of an examinee's eye, and causing a two-dimensional imaging device to capture the measurement light to be reflected from the fundus as a plurality of target pattern images at different distances from a measurement optical axis; a light deflecting member arranged at a position out of a conjugate position with a pupil of the examinee's eye on an optical path of the measuring optical system; a rotor for rotating the light deflecting member about an optical axis of the measuring optical system to allow a plurality of pattern light beams to be eccentrically rotated on the pupil; and a calculator for measuring an eye refractive power of the examinee's eye based on a target pattern image to be captured by the two-dimensional imaging device.