Compact Optical Scanner Motor Rear Mounting
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Solution Overview
Problem
Existing optical scanners using oscillating mirrors face challenges in achieving compact, power-efficient, and cost-effective designs while maintaining effective scan patterns.
Innovation Solution
The optical scanner design incorporates a mirror mounted to rotate about a mirror axis, with a motor positioned behind the mirror to drive a cam or linkage mechanism. This setup allows the mirror to oscillate in various scan patterns, such as sawtooth or triangular, while minimizing the transverse dimensions of the scanner.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a motor is mounted behind the mirror to drive oscillation, then the transverse dimensions of the scanner are reduced, but the mechanical drive complexity increases
Solution Approach 1:
The motor is repositioned from a lateral mounting configuration to a longitudinal mounting configuration behind the mirror. This dimensional change in motor placement allows the drive mechanism to operate within the longitudinal space, significantly reducing the transverse footprint of the scanner while the mechanical complexity is managed through standardized coupling mechanisms.
Solution Approach 2:
The motor is positioned within the spatial envelope defined by the mirror assembly, nesting the drive mechanism within the existing structural boundaries. This nesting approach allows the motor and its shaft to occupy space that would otherwise be unused, reducing overall device volume without proportionally increasing mechanical complexity through shared mounting structures.
2Ease of manufacture
If the motor shaft axis is parallel to but not collinear with the mirror axis, then the mechanical coupling is simplified, but precision in mirror oscillation control may be compromised
Solution Approach 1:
A mechanical coupling mechanism serves as an intermediary between the motor shaft and the mirror assembly. This coupling translates the rotational motion from the parallel motor shaft into precise oscillatory motion of the mirror, decoupling the simplicity of motor mounting from the precision requirements of mirror control. The intermediary mechanism absorbs alignment tolerances while maintaining oscillation precision.
Solution Approach 2:
The motor shaft is positioned in a parallel but offset configuration relative to the mirror axis, creating a spatial separation that simplifies motor mounting and coupling. This dimensional arrangement allows for easier mechanical coupling through standard drive mechanisms while the coupling design itself ensures that the offset does not compromise oscillation precision through proper kinematic design.
3Adaptability or versatility
If cam or linkage mechanisms are used for mechanical drive, then various scan patterns can be produced, but the device complexity increases
Solution Approach 1:
The mechanical drive system is designed with universal components such as standardized linkages or cams that can generate multiple scan patterns (sawtooth, triangular, sinusoidal) through different configuration settings or input drive profiles. This multi-functionality allows a single mechanical architecture to provide scan pattern versatility without requiring separate dedicated mechanisms for each pattern type, thereby limiting the increase in device complexity.
Solution Approach 2:
The mechanical drive system incorporates dynamic elements such as adjustable linkages or programmable cam profiles that can change operational characteristics during operation. This dynamic capability allows the system to produce various scan patterns by modifying motion parameters rather than requiring physically different mechanical structures, achieving scan pattern versatility while keeping the base device complexity manageable through reconfigurable rather than multiplicative design.
Data Source
AI summary
An optical scanner includes a mirror, which has a reflective front surface and a rear surface) and is mounted to rotate about a mirror axis. A motor is mounted behind the mirror in proximity to the rear surface and has a rotating shaft, which rotates about a shaft axis parallel to the mirror axis. A mechanical drive is coupled between the rotating shaft and the mirror so as to cause the mirror to oscillate about the mirror axis responsively to rotation of the shaft.