Optometry Apparatus Light Shielding and Concave Mirror
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Solution Overview
Problem
Existing optometry apparatuses suffer from reduced accuracy in visual function examination due to strong light reflection from external sources entering the examinee's eye through the presentation window, leading to disturbance and decreased examination accuracy.
Innovation Solution
The optometry apparatus incorporates a housing with a presentation window, upper and lower shield members, and lateral shield members of the same color within the visual field angle, along with a concave mirror for target light flux projection, to block external light and ensure accurate target presentation without a beam splitter, allowing for precise visual acuity examination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a transparent plate is used in the presentation window to allow target light flux to pass through, then the examination target can be presented to the examinee's eye, but strong light from external sources is reflected by the transparent plate and enters the examinee's eye, causing disturbance and reducing examination accuracy
Solution Approach 1:
The patent removes the transparent plate from the presentation window, extracting the harmful reflective element while preserving the functional requirement of target light transmission through the optical system. The target light flux is directed through the concave mirror and beam splitter without passing through a transparent plate that would cause external light reflection.
Solution Approach 2:
The patent converts the harmful effect of light reflection into a beneficial configuration by using the beam splitter and concave mirror arrangement to control light paths. The optical system is designed so that the beam splitter directs target light to the examinee while blocking external disturbance light, transforming the potential harm of light interaction with optical elements into a controlled beneficial effect.
2Ease of operation
If a beam splitter and concave mirror are used to guide target light flux to the examinee's eye, then the examination target can be presented, but the apparatus becomes more complex and larger in size
Solution Approach 1:
The patent employs a beam splitter that serves multiple functions: it directs target light flux from the display to the examinee's eye, blocks external disturbance light from entering the optical path, and maintains a compact optical configuration. The concave mirror simultaneously focuses the target light and works with the beam splitter to create an efficient light path, reducing the need for additional optical components.
3Object-affected harmful factors
If shield members are added to block external light from entering the presentation window, then disturbance light is reduced, but the apparatus size increases
Solution Approach 1:
The patent merges the light blocking function into the existing optical components. The beam splitter is positioned and angled to inherently block external light from entering the presentation window while simultaneously directing the target light flux to the examinee's eye. The concave mirror is integrated with the beam splitter arrangement, creating a compact configuration where multiple functions are achieved without adding separate shield members that would increase apparatus volume.
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 configuration ensures accurate target presentation and reduces the influence of disturbance light, maintaining high examination accuracy while minimizing the apparatus's size and light loss, thus providing a space-saving and effective optometry solution.
Implementation Method 1
The concave mirror is configured to reflect the target light flux output from the display toward an examinee's eye along the reference axis
Data Source
AI summary
An optometry apparatus includes: a housing accommodating a concave mirror disposed on a reference axis; and a display disposed outside the housing and out of the reference axis for projecting a target light flux onto the concave mirror. The concave mirror is configured to reflect the target light flux output from the display toward an examinee's eye along the reference axis.