Reflection Mirror Unit Positioning via Integrated Frame
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Solution Overview
Problem
Conventional reflection mirror units in image reading devices face challenges in maintaining accurate positional alignment and posture of reflection mirrors, leading to potential distortion and misalignment of the optical path, which results in blurred or distorted document images.
Innovation Solution
The use of a mirror support frame with bent pieces and slit-like fitting holes and recessed grooves on a base frame ensures accurate positioning and posture of the reflection mirrors, preventing tilting and bending, and allowing for rigid and lightweight construction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional mirror support frames are used with separate frames for mirror support and base mounting, then dimensional precision can be maintained and positional adjustments facilitated, but the device complexity increases and assembly becomes more difficult
Solution Approach 1:
The patent combines the mirror support frame and base frame into a single integrated frame structure. The reflection mirror unit is directly mounted on the base frame, eliminating the need for separate mirror support frames and complex assembly procedures. This integration maintains dimensional precision while simplifying the overall device structure and reducing assembly complexity.
2Strength
If press-working and screw fixation are used to rigidly construct the mirror unit, then the mirrors can be firmly positioned, but the mirrors may be tilted or bent during assembly, causing optical path distortion
Solution Approach 1:
The patent incorporates pre-formed recesses and protrusions during the frame manufacturing process that automatically guide and position the mirrors in the correct orientation before final assembly. This preliminary positioning action prevents tilting and bending during subsequent assembly operations, maintaining both rigid construction and positioning accuracy.
Solution Approach 2:
The patent introduces precision positioning elements such as recesses, protrusions, and guide surfaces as intermediary features between the frame and mirrors. These intermediary structures mediate the connection, ensuring accurate mirror positioning while maintaining the rigid construction needed for stable optical paths.
3Ease of operation
If multiple separate components are used to support the mirrors, then positional adjustments are facilitated, but the assembly process becomes more complex and time-consuming
Solution Approach 1:
The patent merges the positioning and support functions into the integrated frame structure itself. The frame includes built-in positioning features that provide both structural support and precise mirror positioning capabilities, eliminating the need for multiple separate adjustment components and simplifying the assembly process.
Solution Approach 2:
The integrated frame structure performs multiple functions simultaneously: it provides mechanical support for the mirrors, ensures precise positioning through built-in recesses and protrusions, and maintains the required rigidity for stable operation. This multi-functionality reduces the number of components needed and speeds up assembly.
Data Source
AI summary
A reflection mirror unit for a document on a platen includes first and second reflection mirrors, a base frame formed of a plate member and having a sliding portion adapted to slidably engage a guide rail located in a sub-scanning direction for the document on the platen, and a mirror support frame formed of a plate member. The mirror support frame includes a mirror mounting portion for supporting the first and second reflection mirrors opposite to each other with a predetermined angle. First and second coupling portions are formed on the base frame and the mirror support frame to couple together.