Target Presenting Apparatus with Concave Mirror and Beam Splitter
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Solution Overview
Problem
Existing target presenting apparatuses for visual function tests face challenges in accuracy and space efficiency due to reduced light flux when using a display instead of a chart plate, leading to potential distortion and increased installation space.
Innovation Solution
A target presenting apparatus that incorporates a concave mirror, a display, and an optical member within a housing, where the display emits a target light flux inclined relative to the concave mirror's optical axis, and the optical member guides the light flux to present a target to the examinee while minimizing obstruction and space usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a display is used instead of a chart plate to present examination targets, then the apparatus can be more compact and versatile, but the light flux is reduced leading to potential distortion and decreased measurement precision
Solution Approach 1:
A beam splitter is introduced as an intermediary optical component between the display and the examination target path. The beam splitter reflects light from the display while allowing light from the chart plate to pass through, enabling both examination modes without compromising light flux or image quality
Solution Approach 2:
The optical system is designed to accommodate multiple examination functions (distance and near examinations, different target types) through a single integrated apparatus that can switch between display-based and chart plate-based presentation, eliminating the need for separate devices
2Adaptability or versatility
If the apparatus is designed to accommodate both distance and near examination capabilities, then versatility is improved, but the device complexity and installation space increase
Solution Approach 1:
The optical system incorporates movable components including a movable mirror and adjustable optical paths that can be reconfigured dynamically to switch between distance and near examination modes, allowing a single apparatus to perform multiple functions without requiring separate fixed optical systems for each examination type
Solution Approach 2:
The optical components are arranged in a nested configuration where the near examination optical path is integrated within the distance examination path structure, allowing compact arrangement of multiple optical systems sharing common components such as the beam splitter and light source
3Volume of moving object
If the optical components are arranged to minimize space usage, then the apparatus becomes more compact, but the optical path may be obstructed and alignment becomes more difficult
Solution Approach 1:
The optical components are arranged in a three-dimensional configuration that utilizes vertical and lateral spaces efficiently, with the beam splitter positioned at a 45-degree angle to redirect light paths in multiple dimensions, allowing compact packaging without compromising optical path clearance or alignment accessibility
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
The apparatus ensures accurate and efficient presentation of examination targets with reduced distortion and space requirements, allowing for both distance and near-examination capabilities using a single display, while preventing the concave mirror from becoming dirty.
Implementation Method 1
a concave mirror for receiving the target light flux in such a manner as to displace the target light flux from an optical axis thereof
Implementation Method 2
an optical member, placed in the housing, for guiding the target light flux from the inside to the outside of the housing to present a target to an examinee
Data Source
AI summary
A target presenting apparatus includes: a display for emitting a target light flux; a concave mirror for receiving the target light flux in such a manner as to displace the target light flux from an optical axis thereof; a housing for accommodating the concave mirror and the display therein; and an optical member, placed in the housing, for guiding the target light flux from the inside to the outside of the housing to present a target to an examinee.