Light Scanning Device Adhesion Symmetry Warping Compensation
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Solution Overview
Problem
The existing light scanning devices face issues with warping deformation of the lower imaging lens due to temperature changes, leading to deterioration in optical performance and scanning accuracy, caused by differences in linear expansion coefficients between the housing and the lens.
Innovation Solution
The solution involves symmetrically locating adhesion portions between the first and second imaging lenses, with the upper adhesion portions positioned outside the main-scanning direction relative to the lower adhesion portions, ensuring equal adhesive force distribution and minimizing warping deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If imaging lenses are layered in upper and lower stages and secured via adhesion portions, then the device structure is simplified and assembly is easier, but warping deformation occurs due to thermal expansion differences between housing and lens
Solution Approach 1:
The patent applies asymmetry by positioning the upper adhesion portions outside the main-scanning direction relative to the lower adhesion portions. This asymmetric arrangement creates a counterbalancing effect that compensates for thermal warping, preventing the lens from deforming while maintaining the simplified layered structure.
Solution Approach 2:
The patent applies local quality by making the adhesion portions symmetrically located with respect to the center position of the imaging lens in the main-scanning direction. This symmetric local arrangement ensures uniform adhesive force distribution across the lens, preventing localized stress concentrations that would cause warping.
2Ease of manufacture
If adhesion portions are used to secure imaging lenses to housing, then manufacturing and assembly are simplified, but scanning accuracy deteriorates due to warping deformation from thermal expansion
Solution Approach 1:
The asymmetric positioning of upper adhesion portions relative to lower adhesion portions creates a compensatory mechanism that counteracts thermal warping forces. This maintains lens flatness and scanning accuracy while preserving the ease of adhesive mounting process.
Solution Approach 2:
The symmetric arrangement of adhesion portions in the main-scanning direction ensures uniform stress distribution, preventing warping that would degrade scanning accuracy while maintaining simple adhesive bonding for ease of manufacture.
3Stability of the object's composition
If adhesion portions are symmetrically arranged to prevent warping, then lens stability is improved, but the device structure becomes more complex
Solution Approach 1:
The patent uses asymmetric positioning where upper adhesion portions are located outside the main-scanning direction relative to lower adhesion portions. This asymmetric configuration achieves warping compensation with minimal structural complexity, as it only requires positional adjustment rather than additional components.
Solution Approach 2:
The symmetric arrangement of adhesion portions in the main-scanning direction provides lens stability through simple geometric symmetry, avoiding complex structural modifications while effectively preventing warping deformation.
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 reduces warping deformation of the lower imaging lens, thereby maintaining scanning accuracy and optical performance despite environmental temperature changes.
Implementation Method 1
a bottom surface of the first imaging lens is adhesively secured to a housing via a plurality of adhesion portions
Implementation Method 2
is adapted to image the first light beam on a scan object surface, the first light beam being deflected by the deflection unit in order to scan
Implementation Method 3
a deflection unit, which causes the plurality of the light beams emitted from the light source unit to be deflected to scan in the main-scanning direction
Data Source
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AI summary
A light scanning device (4) includes a deflection unit (41), a first imaging lens (42a), and a second imaging lens (42b). The plurality of the adhesion portions (51) interposed between the first imaging lens (42a) and the housing (44) are symmetrically located with respect to a center position of the first imaging lens (42a) in a main-scanning direction. The adhesion portions (52) interposed between the first imaging lens (42a) and the second imaging lens (42b) are symmetrically located with respect to the center position of the first imaging lens (42a) in the main-scanning direction, and are located in the main-scanning direction outside with respect to the adhesion portions (51) between the first imaging lens (42a) and the housing (44).