Reflecting Mirror Position Regulating Portion for Laser Deviation Reduction
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Solution Overview
Problem
Existing scanning optical devices face issues with laser light deviation due to changes in the attitude of the reflecting mirror, leading to decreased printing accuracy and image quality, particularly during transportation and impact events.
Innovation Solution
The scanning optical device incorporates a reflecting mirror with specific surface configurations and a housing design that includes position regulating portions, ensuring the reflecting mirror's ridgelines do not contact the regulating members even when the attitude changes, allowing the mirror to return to its original position without altering the laser light emission point.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the position regulating portion is arranged to constrain the reflecting mirror's movement, then the mirror's position stability is improved, but the ridgeline may get caught in the regulating portion when the mirror's attitude changes due to impact, causing the mirror to fail returning to its original attitude and resulting in laser emission position deviation
Solution Approach 1:
The position regulating portion is segmented into multiple independent regulation points along the longitudinal direction of the reflecting mirror. This segmentation allows the mirror to rotate freely around its longitudinal axis without the ridgeline getting caught, while still maintaining position stability in the width direction. The multiple regulation points work together to constrain the mirror's movement without creating a single point of failure.
Solution Approach 2:
The function of position regulation is extracted from a single contact point and distributed to multiple regulation points. This extraction eliminates the problem of the ridgeline getting caught at one specific location, as the mirror can now rotate without encountering a fixed obstacle. The regulation function is maintained through the collective action of multiple points rather than a single constraining element.
2Volume of moving object
If pressure on the reflecting mirror is applied only in the direction perpendicular to the mirror reflecting surface, then the device size and thickness are reduced, but the mirror may move in the direction parallel to the reflecting surface, affecting position accuracy
Solution Approach 1:
The position regulation mechanism transitions from one-dimensional (single direction pressure) to two-dimensional control. The regulating portion extends in the longitudinal direction of the mirror, providing constraint in both the width direction (perpendicular to pressure) and maintaining position accuracy. This dimensional extension allows the mirror to be constrained without requiring increased device thickness.
3Stability of the object's composition
If the reflecting mirror is supported at both end portions in the longitudinal direction, then the mirror stability is improved, but the device complexity increases due to the need for precise positioning and regulation mechanisms
Solution Approach 1:
The support and regulation functions are merged into a single integrated position regulating portion. This regulating portion simultaneously provides mechanical support at the mirror's end portions and constrains the mirror's movement in the width direction. By combining these functions, the design achieves mirror stability without requiring separate, complex positioning and regulation mechanisms.
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 design effectively reduces laser light deviation and maintains printing accuracy by preventing the reflecting mirror's attitude changes from affecting the laser light emission position, even under impact or transportation conditions.
Implementation Method 1
an elastic member constituted to urge the reflecting mirror toward the housing
Implementation Method 2
a reflecting mirror constituted to reflect the laser light deflected by the deflection unit to guide to the object to be scanned
Data Source
AI summary
A scanning optical device includes a deflector, a reflecting mirror, a housing to accommodate the deflector and the mirror; and an elastic member to urge the mirror toward the housing. The mirror includes a first surface urged by the elastic member, a second surface opposite to the first surface, a third surface and a fourth surface perpendicular to the first and second surfaces. The housing includes a bearing surface to support the second surface and a regulating portion to regulate movement of the mirror to a mirror widthwise direction, perpendicular to a mirror longitudinal direction and parallel with the second surface, and toward an opening of the housing. The regulating portion is provided opposite to only a part of the third surface so that a ridge line of the mirror between the second surface and the third surface does not contact the regulating member even an attitude of the mirror changes in a direction away from the bearing surface.