Polygon Mirror Scanner Motor Spring Fixing Groove
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Solution Overview
Problem
Conventional polygon mirror scanner motors face challenges in reducing the number of components to lower costs, with existing designs experiencing deformation and surface tilt issues due to the large spring load and straight-shaped mirror fixing springs that can bite into the polygon mirror.
Innovation Solution
A polygon mirror scanner motor design featuring a sleeve with a seat surface and a mirror fixing spring that pressurizes the polygon mirror from above, with a shorter distance between the rotary shaft and the pressurizing position, and a spring fixing groove to reduce the number of components and prevent deformation, utilizing a curved surface section to distribute the load effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a spring fixing ring is added to fix the mirror fixing spring, then the mirror fixing spring can be securely fixed, but the number of components increases and cost increases
Solution Approach 1:
The patent integrates the spring fixing ring function directly into the sleeve structure by forming a spring fixing groove on the sleeve. This merging of functions eliminates the need for a separate spring fixing ring component, thereby reducing component count and cost while maintaining reliable mirror fixing spring fixation.
Solution Approach 2:
The patent extracts the spring fixing ring as a separate component and integrates its fixing function directly into the sleeve through the spring fixing groove. This allows the sleeve to perform both rotational support and spring fixation functions, reducing overall device complexity.
2Length of moving object
If the pressurizing position of the mirror fixing spring is set on the inner side to reduce diameter, then the spring load becomes large, but this causes deformation of the polygon mirror
Solution Approach 1:
The patent applies local quality by creating a curved surface section on the mirror fixing spring that specifically contacts the polygon mirror. This curved contact surface distributes the spring load over a larger local area, preventing deformation at the pressurizing position while allowing the inner-side pressurizing configuration to maintain compact diameter.
Solution Approach 2:
The patent employs curvature by designing the mirror fixing spring with a curved surface section instead of a straight shape. This curved configuration allows the spring to distribute pressure more evenly across the polygon mirror surface, preventing biting and deformation while maintaining the compact inner-side pressurizing position.
3Device complexity
If a straight-shaped mirror fixing spring is used, then the structure is simple, but the spring does not easily slide on the top surface of the polygon mirror causing it to bite into the mirror
Solution Approach 1:
The patent applies curvature by designing the mirror fixing spring with a curved surface section that contacts the polygon mirror. This curved configuration allows the spring to slide smoothly on the mirror surface during assembly and operation, preventing the biting effect while maintaining structural simplicity.
Solution Approach 2:
The patent transitions from a straight-line contact configuration to a curved surface contact configuration. This dimensional change in the contact geometry allows the spring to conform to the mirror surface and slide smoothly, preventing localized stress concentration and biting while maintaining overall structural simplicity.
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
The design allows for precise attachment of the polygon mirror with reduced deformation and surface tilt, achieving a more stable and efficient scanning mechanism while minimizing component count and preventing the mirror fixing spring from biting into the polygon mirror.
Implementation Method 1
a mirror fixing spring configured to fix the polygon mirror... the second surface of the polygon mirror is pressurized by the mirror fixing spring
Data Source
AI summary
A distance between the rotary shaft and the pressurizing position of the polygon mirror by the mirror fixing spring is shorter than a distance between the rotary shaft and a position at which the polygon mirror comes into contact with the seat surface. When a difference between an outer radius and an inner radius of the polygon mirror is defined as A, and a difference between the distance between the rotary shaft and the pressurizing position of the polygon mirror by the mirror fixing spring and the distance between the rotary shaft and the position at which the polygon mirror comes into contact with the seat surface is defined as C, the relationship of 0<C≤A/4 is established. When a distance, in a direction orthogonal to the rotary shaft, between a position at which the inner diameter side of the polygon mirror comes into contact with the sleeve and the position of the seat surface is defined as E, the relationship of A/3≤E≤A/2 is established.