MEMS Torsion Oscillator Angular Alignment via Ball-and-Socket Mount
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Solution Overview
Problem
In image forming devices like laser printers, the precise alignment of MEMS torsion oscillators with respect to lenses and mirrors is challenging due to manufacturing tolerances and assembly techniques, leading to potential misalignment of the laser beam, which affects the accuracy of the image formed.
Innovation Solution
A ball-and-socket configuration is used to mount the MEMS torsion oscillator, allowing for angular alignment by rotating the spherical base within a socket, with adjustment screws and spring members enabling fine-tuned adjustments along three axes without interfering with the light path, ensuring precise skew, process, and scan alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional mounting methods are used for the MEMS scanner, then the assembly is simple, but the alignment precision of the laser beam is insufficient
Solution Approach 1:
The patent employs a spherical base mounted in a spherical socket to enable multi-axis angular adjustment of the MEMS scanner. The spherical geometry allows rotation about multiple axes (skew, process, and scan directions) while maintaining a fixed pivot point, thereby achieving precise alignment without compromising structural simplicity.
2Manufacturing precision
If the scanner position is adjusted to improve alignment, then the alignment accuracy improves, but the center position of the scanner shifts
Solution Approach 1:
The spherical mounting interface enables angular adjustments in skew, process, and scan directions while the scanner's center remains fixed at the sphere's center. This geometric configuration allows alignment optimization without introducing positional shifts that would compromise measurement precision.
Solution Approach 2:
The adjustment mechanism is segmented into three independent adjustment screws, each controlling rotation about a specific axis (skew, process, or scan direction). This segmentation allows independent adjustment of each alignment parameter without affecting the others, maintaining center position stability while achieving precise alignment.
3Adaptability or versatility
If multiple adjustment parameters are introduced to improve alignment, then the alignment flexibility improves, but the adjustment mechanism becomes complex
Solution Approach 1:
The adjustment mechanism is divided into three independent adjustment screws, each controlling rotation about a specific axis (skew, process, or scan direction). This segmentation provides flexible multi-axis adjustment capability while keeping each individual adjustment element simple and easy to control.
Solution Approach 2:
The spherical base-socket interface naturally provides multi-degree-of-freedom adjustment capability. The spherical geometry inherently allows rotation about multiple axes, providing alignment flexibility without requiring complex mechanical linkages or adjustment mechanisms.
Data Source
AI summary
Apparatus for aligning a scanner assembly in a laser scanning unit for an image forming device. A MEMS torsion oscillator is attached to a spherical base that is received by a socket in a laser scanning unit. The pivotal center of the scanner coincides with the center of the spherical base such that the center of the scanner does not move as the scanner is aligned in the skew, process, and scan directions. In various embodiments, the aligned relationship of the spherical base to the socket is maintained by an adhesive, a through-bolt, or a plurality of spring-biased adjustment screws. The configuration and location of the adjustment screws is such that adjustment of the scanner assembly is accomplished without blocking the laser beam used for alignment.