Conical Optical Layout for Compact Dual-Eye Fixation Inspection
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Solution Overview
Problem
Existing inspection apparatuses face complexity and size issues due to separate optical systems for projecting light onto the retina and guiding reflected light, necessitating precise alignment that complicates the design and increases the apparatus' size.
Innovation Solution
An optical system with a conical lens and half-mirror configuration that guides light to and from both eyes, forming an intermediate image, allowing overlapping reflected light on an image sensor to simplify the system and reduce its size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If optical separation is implemented using lenses near intermediate image, then detection accuracy is maintained, but device complexity and size increase
Solution Approach 1:
The patent extracts the optical separation function from the traditional lens-based system and relocates it to the image sensor level. By using a mask pattern on the image sensor to selectively receive light from different eyes, the system eliminates the need for complex intermediate optical separation components, thereby reducing device complexity while maintaining detection accuracy.
Solution Approach 2:
The patent transitions from spatial optical separation in the intermediate image space to a two-dimensional pattern-based separation at the image sensor plane. The mask pattern with first and second regions creates distinct light reception zones, enabling eye separation without additional optical path length or complex lens arrangements.
2Measurement precision
If optical separation is implemented using lenses near intermediate image, then detection accuracy is maintained, but apparatus size increases
Solution Approach 1:
The patent extracts the optical separation function from the traditional lens-based system and relocates it to the image sensor level. By using a mask pattern on the image sensor to selectively receive light from different eyes, the system eliminates the need for complex intermediate optical separation components, thereby reducing device complexity while maintaining detection accuracy.
Solution Approach 2:
The patent merges the light reception function with the separation function by integrating the mask pattern directly into the image sensor structure. This combination eliminates the need for separate optical separation components and their associated mounting spaces, thereby compacting the overall apparatus size while maintaining the ability to distinguish light from different eyes.
3Measurement precision
If relative positional shift between projection and detection optical systems is suppressed, then detection accuracy is maintained, but device complexity increases
Solution Approach 1:
The patent extracts the optical separation function from the traditional lens-based system and relocates it to the image sensor level. By using a mask pattern on the image sensor to selectively receive light from different eyes, the system eliminates the need for complex intermediate optical separation components, thereby reducing device complexity while maintaining detection accuracy.
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 solution enables a compact and simplified optical system that accurately detects fixation states by overlapping reflected light from both eyes without requiring complex optical separation, enhancing measurement accuracy and reducing apparatus size.
Implementation Method 1
an optical system including a first optical element having a conical surface
Implementation Method 2
An intermediate image is formed between the first optical element and each of the first target and the second target
Implementation Method 3
The first reflected light and the second reflected light are guided to an imaging plane of the image sensor such that at least part of the first reflected light and part of the second reflected light overlap each other on the imaging plane
Data Source
AI summary
An optical system is configured to guide light from a light source to a first target and a second target, and to guide first reflected light from the first target and second reflected light from the second target to an image sensor. The optical system includes a first optical element having a conical surface. An intermediate image is formed between the first optical element and each of the first target and the second target. The first reflected light and the second reflected light are guided to an imaging plane of the image sensor such that at least part of the first reflected light and part of the second reflected light overlap each other on the imaging plane.