Imaging Device Diffuser Plate Lens Randomization
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Solution Overview
Problem
Conventional imaging devices with diffuser plates experience interference fringes due to coherent light sources, leading to non-uniform light intensity and image quality issues, which existing solutions cannot completely eliminate.
Innovation Solution
The imaging device configures a diffuser plate with lenses arranged such that the period of interference fringes is less than or equal to three pixels of the imaging element, and the lens positions are randomly shifted by up to 20% from virtual grid points, ensuring the interference fringes' period aligns with the pixel group size for effective filtering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a diffuser plate with regularly arranged lenses is used, then light diffusion is achieved, but interference fringes are generated due to coherent light sources
Solution Approach 1:
The patent applies asymmetry by randomly shifting the positions of lenses from a regular grid arrangement. This random displacement breaks the periodicity that causes interference fringes while maintaining the diffuser plate's light diffusion function. The asymmetric positioning prevents coherent light from creating regular interference patterns.
Solution Approach 2:
The patent implements local quality by giving each lens a slightly different position from the regular grid. This local variation in lens positioning creates different optical paths for light passing through different regions, thereby suppressing interference fringes while maintaining overall light diffusion uniformity.
2Object-affected harmful factors
If two or more kinds of lenses with different curved surfaces are disposed, then interference fringes are suppressed, but the influence of interference fringes cannot be completely eliminated
Solution Approach 1:
The patent changes the positional parameters of lenses by randomly displacing them from their regular grid positions. This parameter variation approach suppresses interference fringes more effectively than using lenses with different curved surfaces, and can completely eliminate the influence of interference fringes on imaging quality.
3Manufacturing precision
If lenses are randomly shifted from virtual grid points, then interference fringe period is reduced to less than or equal to three pixels, but device complexity increases
Solution Approach 1:
The patent applies partial action by limiting the random shift of lenses to within a specific range (less than or equal to one-quarter of the distance between adjacent virtual grid points). This controlled randomization achieves sufficient interference fringe suppression without requiring complete randomization, thereby balancing manufacturing precision with device complexity.
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 configuration effectively suppresses the influence of interference fringes in the captured image, ensuring uniform light intensity and improved image quality by aligning the interference fringe period with the pixel group size and reducing fringe generation.
Implementation Method 1
a diffuser plate configured by a lens array having a plurality of lenses that are arranged to be adjacent to one another. The diffuser plate uniformly diffuses light emitted from a light source.
Implementation Method 2
use of a light source such as a laser diode for emitting coherent light to an imaging device causes interference of light passing through the lenses due to diffraction. This causes interference fringes.
Implementation Method 3
an imaging element of the imaging device receives the diffused light reflected by the subject
Data Source
AI summary
An imaging device includes a light source, a plurality of lenses disposed adjacent to one another on a predetermined plane, a diffuser plate that diffuses light to be emitted from the light source, and an imaging element that includes a plurality of pixels, the imaging element being configured to receive reflection light generated by causing the light diffused by the diffuser plate to be reflected from a subject. The plurality of lenses are disposed so that a period of interference fringes in the diffused light is less than or equal to three pixels of the imaging element. This configuration can provide the imaging device in which an influence of the interference fringes of the diffused light can be suppressed in an image that is obtained when an image of the subject is captured by irradiating the subject with the light diffused by the diffuser plate having the plurality of lenses.