Rotary Reciprocating Actuator Assembly for Precise Mirror Positioning
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Solution Overview
Problem
Existing rotary reciprocating drive actuators face challenges in achieving high accuracy and assemblability when positioning and fixing a galvano mirror, particularly when its axis is perpendicular to the product, due to limitations in defining precise rotational angles and secure attachment.
Innovation Solution
A configuration including a movable body with a magnet on a shaft, a base portion with bearing support, and a core assembly with magnetic poles and a coil, along with a magnet position holding portion to generate a magnetic attraction force, allowing for precise positioning and fixation of the actuator to a target object.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the beam scanner is fixed to position the mirror with high accuracy, then the rotational angle precision is improved, but the assembly complexity increases
Solution Approach 1:
The actuator is divided into modular components (base portion, core assembly, coil assembly) that can be assembled separately and then integrated. The positioning fixation part is provided on the base portion, allowing precise positioning to be achieved through modular assembly rather than complex integrated machining.
Solution Approach 2:
The patent replaces complex mechanical positioning mechanisms with a magnetic positioning system. The magnet position holding portion generates magnetic attraction force to define the reference position of the reciprocating rotation, eliminating the need for complex mechanical positioning fixtures and reducing assembly complexity while maintaining high rotational angle precision.
2Ease of manufacture
If the galvano mirror is fixed with its axis perpendicular to the product, then the assemblability is improved, but the positioning accuracy deteriorates
Solution Approach 1:
The magnetic positioning system replaces traditional mechanical positioning methods that would be difficult to implement with perpendicular mounting. The magnet position holding portion generates magnetic attraction force to precisely define the reference position, enabling high positioning accuracy to be achieved even when the galvano mirror axis is perpendicular to the product surface, thereby improving assemblability without sacrificing precision.
Solution Approach 2:
The patent changes the positioning mechanism from mechanical contact-based positioning to magnetic field-based positioning. This parameter change allows the positioning fixation part to accurately define the reference position through magnetic attraction, making the system suitable for perpendicular mounting configurations where traditional mechanical positioning would be difficult.
3Manufacturing precision
If a positioning fixation part is added to the actuator, then the positioning accuracy is improved, but the device complexity increases
Solution Approach 1:
The positioning fixation part is merged with the base portion of the actuator, forming an integrated structure. The magnet position holding portion is combined with the magnet and core assembly, eliminating the need for separate positioning mechanisms. This merging approach adds positioning accuracy while minimizing the increase in overall device complexity.
Solution Approach 2:
The patent replaces complex mechanical positioning structures with a magnetic positioning system. The magnet position holding portion generates magnetic attraction force to define the reference position, providing high positioning accuracy without requiring complex mechanical fixtures, adjustment mechanisms, or alignment systems that would significantly increase device complexity.
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
Enables high-accuracy and high-assemblability positioning and fixation of the rotary reciprocating drive actuator, ensuring stable and precise rotational movements of the mirror, enhancing the actuator's performance and reliability.
Implementation Method 1
a magnet position holding portion that generates a magnetic attraction force between the magnet position holding portion and the magnet to define a reference position of the reciprocating rotation
Implementation Method 2
a coil body that is wound around the core body and that is energized to generate a magnetic flux interacting with the magnet to cause a reciprocating rotation of the movable body
Data Source
AI summary
A rotary reciprocating drive actuator includes: a movable body including a shaft part to which a magnet is fixed, the movable body being configured to perform a reciprocating rotation about an axis; a base portion including a pair of wall portions for supporting the shaft part via a bearing; and a core assembly including: a core body including a plurality of magnetic poles facing the magnet, a coil body, and a magnet position holding portion to define a reference position of the reciprocating rotation, the core assembly being fixed to one wall portion, in which at least one of the base portion, the core body, or the core assembly includes a positioning fixation part for positioning and fixing the at least one of the base portion, the core body, or the core assembly to a fixation target object in a direction parallel to the shaft part.