Lens Mirror Array Stray Light Reflection Surface
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Solution Overview
Problem
Image reading devices, such as scanners, face issues with stray light interference due to the application and peeling of light blocking films on the lens mirror array, which can lead to noise in the image signal, complicating the manufacturing process and reducing image quality.
Innovation Solution
The implementation of a lens mirror array with integrated stray light reflection surfaces inclined to deflect stray light away from the imaging elements, eliminating the need for external light blocking films and simplifying the manufacturing process, while the diaphragm section with slits defines the effective light path to prevent stray light from entering the lens mirror array.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a light blocking film is applied on the lens mirror array to cut stray light, then stray light reduction is improved, but manufacturing complexity and reliability deteriorate due to application spots and peeling
Solution Approach 1:
The patent merges the light blocking function with the lens mirror array structure itself by forming a light blocking layer directly on the lens surfaces. This integration eliminates the separate light blocking film that causes reliability issues, while maintaining the stray light cutting function through the integrated light blocking layer.
Solution Approach 2:
The patent extracts the light blocking function from the external light blocking film and transfers it to the lens mirror array structure. By forming the light blocking layer directly on the lens surfaces, the harmful external film is removed while retaining the necessary light blocking capability.
2Object-affected harmful factors
If a light blocking film is applied on the lens mirror array to cut stray light, then stray light reduction is improved, but device complexity increases due to additional manufacturing steps
Solution Approach 1:
The patent combines the light blocking function with the lens mirror array manufacturing process itself. By forming the light blocking layer during the same manufacturing steps as the lens array (molding or coating), the device structure is simplified and manufacturing complexity is reduced.
Solution Approach 2:
The lens mirror array structure is designed to serve multiple functions: optical focusing and stray light blocking. The light blocking layer is formed as part of the lens structure, making the lens array a multi-functional component that eliminates the need for separate light blocking elements.
3Object-affected harmful factors
If a light blocking film is applied on the lens mirror array to cut stray light, then stray light reduction is improved, but manufacturing precision deteriorates due to application spots and peeling
Solution Approach 1:
The patent merges the light blocking layer formation with the lens mirror array manufacturing process. By forming the light blocking layer during molding or coating operations, the application quality issues of external films are eliminated, and manufacturing precision is improved through integrated process control.
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 effectively reduces noise in the image signal by directing stray light away from the imaging elements, enhancing image quality and simplifying the manufacturing process by eliminating the need for light blocking films, thereby improving the overall performance of the image reading device.
Implementation Method 1
an incident-side lens surface...transmits and converges reflected light from a read surface
Implementation Method 2
an upstream-side reflection surface...reflects light made incident via the incident-side lens surface
Implementation Method 3
a downstream-side reflection surface...reflects the light reflected on the upstream-side reflection surface
Implementation Method 4
an emission-side lens surface...transmits and converges the light reflected on the downstream-side reflection surface and images the light on an imaging surface
Implementation Method 5
a stray light reflection surface...reflects...stray light to be noise of the effective light in a direction separating
Implementation Method 6
The photoelectric conversion section...photoelectrically converts the received reflected light, and outputs the reflected light as image information
Data Source
AI summary
An image reading device includes a lens mirror array, a photoelectric conversion section, and a diaphragm section. The lens mirror array includes a plurality of optical elements. Each of the optical elements includes an incident-side lens surface, an upstream-side reflection surface, a downstream-side reflection surface, an emission-side lens surface, and a stray light reflection surface. The incident-side lens surface transmits and converges reflected light from a read surface. The upstream-side reflection surface reflects light made incident via the incident-side lens surface. The downstream-side reflection surface reflects the light. The emission-side lens surface transmits and converges the light and images the light on an imaging surface. The stray light reflection surface reflects stray light. The photoelectric conversion section receives, photoelectrically converts, and outputs the reflected light. The diaphragm section is disposed between the read surface and the incident-side lens surface and includes a slit-like opening section.