Reading Device Specular Reflection Isolation
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Solution Overview
Problem
In reading devices, the inclusion of diffuse reflection light with specular reflection light can degrade image quality, as the larger reflection region that enhances light amount also captures unwanted diffuse reflections.
Innovation Solution
A reading device design that uses a combination of light emitting units for specular and diffuse reflection, with specific optical path configurations and reflection surfaces to isolate specular reflection light, guiding it to an image sensor while minimizing diffuse reflection contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the reflection region is made larger to increase the amount of reflection light, then the luminance of the image is improved, but diffuse reflection light is also included which degrades image quality
Solution Approach 1:
The reflection region is divided into a first reflection region for capturing specular reflection light and a second reflection region for capturing diffuse reflection light. By segmenting the reflection regions and using separate optical paths for each type of reflection light, the patent enables independent control of specular and diffuse reflection light capture, thus improving image quality while maintaining sufficient luminance
Solution Approach 2:
The patent extracts and separates specular reflection light from diffuse reflection light by using different reflection regions and optical paths. The specular reflection light is extracted through a first optical path with a first focal length, while diffuse reflection light is extracted through a second optical path with a second focal length, allowing pure specular reflection imaging without contamination from diffuse reflection
2Quantity of substance
If the reflection region is made larger to increase the amount of reflection light, then the light amount reaching the image sensor is improved, but the purity of specular reflection light is reduced due to diffuse reflection contamination
Solution Approach 1:
The reflection region is divided into a first reflection region for capturing specular reflection light and a second reflection region for capturing diffuse reflection light. By segmenting the reflection regions and using separate optical paths for each type of reflection light, the patent enables independent control of specular and diffuse reflection light capture, thus improving image quality while maintaining sufficient luminance
Solution Approach 2:
The patent extracts and separates specular reflection light from diffuse reflection light by using different reflection regions and optical paths. The specular reflection light is extracted through a first optical path with a first focal length, while diffuse reflection light is extracted through a second optical path with a second focal length, allowing pure specular reflection imaging without contamination from diffuse reflection
3Device complexity
If a single optical path is used to simplify the device structure, then the device complexity is reduced, but the ability to selectively capture only specular reflection light is compromised
Solution Approach 1:
The optical system is segmented into a first optical path for specular reflection light and a second optical path for diffuse reflection light. Each optical path has its own focal length and is optimized for capturing specific types of reflection light, enabling selective capture while maintaining manageable device complexity through modular design
Solution Approach 2:
Different parts of the optical system are designed with different focal lengths tailored to their specific functions. The first optical path uses a first focal length optimized for specular reflection light, while the second optical path uses a second focal length optimized for diffuse reflection light, allowing each component to have the local quality needed for its specific purpose
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 approach improves image quality by ensuring that only specular reflection light is captured by the image sensor, reducing the impact of diffuse reflections and enhancing the luminance of the generated image.
Implementation Method 1
an optical path unit having a reflection surface configured to reflect a part of light emitted from the first emitting unit
Implementation Method 2
an image sensor that generates an image from specular reflection of the part of light guided by the optical path from the original
Data Source
AI summary
Provided is a reading device including: a first emitting unit configured to emit light; an optical path unit having a reflection surface configured to reflect a part of light emitted from the first emitting unit, and an optical path configured to guide the part of light from the reflection surface to an original; and an image sensor that generates an image from specular reflection of the part of light guided by the optical path from the original.