Surface Foreign Substance Detector Film Holder Light Absorption
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Solution Overview
Problem
Existing surface foreign substance detectors for transparent or translucent films face challenges in reliability due to external environmental factors, light emission variations, and film deformation, leading to inaccurate detection results in clean room environments.
Innovation Solution
A surface foreign substance detector with a through-shaped optical housing, light emission unit at the lower side, and a film holder made of light-absorbing material, emitting light circumferentially with an angle of 5° to 30°, and using a thermally conductive material for the optical housing and light blocking plate to prevent external light interference and heat damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If a conventional foreign substance inspecting device is used, then automation is improved, but detection reliability deteriorates due to environmental sensitivity
Solution Approach 1:
The patent creates a controlled inspection environment by blocking external light sources and using a light-tight housing structure. This inert environmental approach isolates the inspection process from external environmental factors (light, temperature variations) that cause measurement fluctuations, thereby maintaining high detection reliability while using automated equipment.
Solution Approach 2:
The patent introduces a light-tight housing and controlled illumination system as intermediaries between the automated inspection device and the sample. This intermediary structure prevents direct interaction between environmental factors and the inspection process, eliminating the sensitivity to external conditions while preserving automation benefits.
2Ease of operation
If light emission amount varies due to external factors, then ease of operation is improved, but measurement precision deteriorates
Solution Approach 1:
The patent controls the illumination parameter by using a stable light source with consistent emission intensity and positioning it at a fixed angle (5° to 30°) relative to the film surface. This parameter control ensures that variations in light emission do not affect measurement precision, while the system remains easy to operate through automated illumination control.
Solution Approach 2:
The patent employs a feedback mechanism where the detection system monitors the actual light conditions and adjusts illumination parameters to maintain consistent measurement conditions. This feedback loop compensates for any light emission variations, preserving measurement precision without complicating the operation.
3Illumination intensity
If the film holder uses light-reflecting material, then illumination is improved, but measurement precision deteriorates due to light interference
Solution Approach 1:
The patent applies different surface properties to different parts of the film holder: the upper surface that contacts the film uses a light-absorbing material to prevent interference reflections, while other surfaces may have different properties optimized for their specific functions. This local differentiation resolves the contradiction by eliminating harmful light reflections only where they affect measurement precision.
Solution Approach 2:
The patent converts the potential harmful effect of light reflection into a beneficial controlled illumination system. By using light-absorbing material on the film holder, the system eliminates unwanted reflections that would interfere with detection, while the controlled light source provides the necessary illumination at precise angles, turning a potential problem into a solution.
4Ease of operation
If the film is not flat due to heat deformation, then ease of operation is maintained, but measurement precision deteriorates
Solution Approach 1:
The patent uses a flexible film holder that can adapt to slight film deformations without requiring the film to be perfectly flat. The holder's dynamic structure accommodates thermal expansion and contraction of the film while maintaining proper illumination and detection geometry, thus preserving measurement precision even when the film is not perfectly flat.
Solution Approach 2:
The patent compensates for film flatness issues by adjusting the illumination angle in a different dimensional space (angular dimension). By emitting light at a specific angle (5° to 30°) rather than perpendicular to the film, the system can maintain accurate detection even when the film surface has slight deformations, effectively using angular adjustment to compensate for spatial deviations.
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 enhances detection reliability by preventing foreign substance movement, minimizing measurement errors due to film deformation and light variations, and maintaining accurate results even when the film is not flat, while preventing external light interference and heat-induced damage.
Implementation Method 1
a light emission unit provided at a lower side of the optical housing to emit the light toward the film
Implementation Method 2
formed of a light-absorbing material capable of absorbing the light or reflecting the light at a predetermined ratio or less
Implementation Method 3
using a thermally conductive material for the optical housing and light blocking plate to prevent external light interference and heat damage
Data Source
AI summary
Disclosed is a surface foreign substance detector for a transparent or translucent film. The surface foreign substance detector for a transparent or translucent film according to the present invention comprises: an optical unit; an optical housing accommodating the optical unit therein; a light emission unit emitting light to the film; and a film holder providing a loading surface such that the film can be loaded thereon and made of a light-absorbing material capable of absorbing light or reflecting the light at a predetermined ratio or less. According to the present invention, the holder supporter is manufactured by using a material capable of generating a predetermined electrostatic force or more between the holder supporter and the foreign substances floating in a surrounding space to prevent foreign substances floating or scattered in a surrounding work space from being moved to the film side, thereby improving detection reliability.