Optical Scanning Device Housing With Ribs And Damping
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Solution Overview
Problem
Optical scanning devices face image deterioration due to beam performance changes caused by vibration of the deflecting mirror, which is exacerbated by increased rotation speed, leading to potential warping of the housing and misalignment of optical components.
Innovation Solution
The housing is designed with a bottom plate and side walls, featuring parallel ribs that connect to the side walls, with a central portion of the bottom plate positioned higher than the surrounding areas, and through holes for improved heat dissipation, reducing temperature differences and preventing warping during manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the rotation speed of the deflecting mirror is increased to increase the number of images formed per unit time or increase resolution, then productivity is improved, but vibration of the deflecting mirror becomes larger causing image deterioration
Solution Approach 1:
The patent applies preliminary action by pre-positioning a vibration damping member between the deflector and the housing bottom plate before the deflecting mirror is installed. This damping member is already in place to suppress vibrations that will occur during high-speed rotation, allowing the system to achieve high productivity without image deterioration. The damping structure is built into the housing design itself, creating a preliminary protective measure against vibration-induced image quality degradation.
2Measurement precision
If the rotation speed of the deflecting mirror is increased to increase resolution, then measurement precision is improved, but vibration of the deflecting mirror becomes larger causing image deterioration
Solution Approach 1:
The vibration damping member is pre-installed in the housing structure before the optical components are assembled. This preliminary placement ensures that when high rotation speeds are used to achieve higher resolution, the damping structure is already in position to suppress vibrations, thereby maintaining image quality even at high measurement precision settings.
Solution Approach 2:
The vibration damping member acts as an intermediary element between the deflector (which generates vibrations during high-speed rotation) and the housing structure. This intermediate damping component absorbs and suppresses vibrations before they can affect the optical elements and cause image deterioration, enabling high-resolution imaging without quality degradation.
3Stability of the object's composition
If ribs are added to increase rigidity of the central portion of the housing, then stability is improved, but warping of the bottom plate occurs due to temperature distribution during casting
Solution Approach 1:
The patent applies local quality by strategically positioning vibration damping members at specific locations where vibrations are most problematic, rather than uniformly reinforcing the entire housing. The damping members are placed between the deflector and the bottom plate at locations corresponding to vibration nodes or high-vibration areas, providing localized stabilization that maintains overall dimensional accuracy while suppressing vibrations.
Solution Approach 2:
The patent changes the physical parameters of the housing structure by introducing vibration damping members with specific material properties (high damping capacity) at critical locations. This parameter change allows the housing to maintain rigidity for vibration suppression while the damping material absorbs vibrational energy, preventing the warping that would otherwise occur due to temperature gradients during the casting process.
4Reliability
If the deflecting mirror is positioned near the center of the housing to reduce vibration transmission, then reliability is improved, but the housing has lowest rigidity at the center causing larger vibration
Solution Approach 1:
The vibration damping member serves as an intermediary element placed between the deflector (positioned near the center) and the housing bottom plate. This intermediate damping structure compensates for the low rigidity of the central housing region by absorbing vibrational energy, allowing the deflecting mirror to be positioned near the center for effective vibration suppression while the damping member makes up for the reduced structural rigidity.
Solution Approach 2:
The patent effectively creates a composite structure by combining the housing material with vibration damping material in a layered or integrated configuration. The vibration damping member introduces a material with high damping properties into the housing structure, creating a composite system that maintains the necessary rigidity for structural support while adding vibration suppression capabilities at the critical central region.
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 ensures accurate housing dimensions, reduces vibration-induced image quality issues, and maintains precise beam performance by minimizing warping and enhancing the structural rigidity of the housing.
Implementation Method 1
Heat of the mold material is conducted to the molds 1301, 1302
Implementation Method 2
Heat of the mold material is conducted to the molds 1301, 1302, and further radiated from the molds 1301, 1302 to surrounding space
Implementation Method 3
the deflecting mirror vibrates due to the rotation. When the vibration of the deflecting mirror is transmitted to the optical element via the deflector and the housing, and these members vibrate
Data Source
AI summary
An optical scanning device including: a light source; a deflector that deflects light from the light source; an optical element that guides light deflected by the deflector on an optical path to a photosensor; and a housing that accommodates the deflector and the optical element. The housing is integrally formed and includes a bottom plate, a side wall standing upright from a periphery of a main surface of the bottom plate, and a pair of ribs parallel with each other and standing upright from the bottom plate. Both longitudinal ends of each of the ribs in plan view are joined to the side wall. A region of the bottom plate between the ribs in the plan view has a portion displaced farther upward in an upright direction of the side wall than other regions of the bottom plate.