Optical Pickup Suspension Wire Positioning via Cutaway Base
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Solution Overview
Problem
The random positioning of suspension wires in existing optical pickups due to dynamic moments during soldering leads to deviation of the lens actuator, resulting in tracking and focusing errors, which reduces the accuracy of optical disc operations.
Innovation Solution
The optical pickup design incorporates a suspension-wire support base with cutaway sections and lands that allow for partial reception of the suspension wires, ensuring they are soldered with controlled tension, thereby minimizing positional deviations by creating one-sided dynamic moments that fix the wires accurately.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If suspension wires are soldered to the printed circuit board without structural guidance, then the soldering process is simple, but the wires are fixed in random positions causing lens actuator deviation
Solution Approach 1:
The cutaway section is pre-formed on the printed circuit board to receive and guide the suspension wire into a predetermined position before soldering occurs. This preliminary structural preparation ensures the wire is correctly positioned during the soldering process, eliminating random positioning while maintaining process simplicity.
Solution Approach 2:
The cutaway section acts as an intermediary structure between the suspension wire and the printed circuit board. It provides a dedicated receptacle that guides the wire to the correct position and maintains proper tension during soldering, mediating the connection between the wire and the board without requiring complex external fixtures.
2Ease of operation
If the suspension wire hole diameter is larger than the wire diameter for easy insertion, then wire insertion is simple, but the wire cannot be properly positioned during soldering
Solution Approach 1:
The cutaway section is pre-formed to provide lateral confinement for the suspension wire. This preliminary structural feature guides the wire into the correct position before soldering begins, ensuring positional accuracy is achieved during the soldering process while maintaining easy insertion through the larger hole.
Solution Approach 2:
The printed circuit board has different structural characteristics in different locations: a larger hole diameter for easy wire insertion, but a cutaway section with specific geometry to provide lateral confinement and positioning. This local differentiation of structural properties allows both easy insertion and precise positioning to be achieved simultaneously.
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 enhances the positional accuracy of suspension wires, reducing tracking and focusing errors and improving the overall performance of the optical pickup by ensuring consistent wire fixation.
Implementation Method 1
The suspension wire 104c is then fixed to the land 114c with a solder 106
Implementation Method 2
While the solder 106 is being applied, it creates tension to the suspension wire 104c with dynamic moments in all directions (360°)
Data Source
AI summary
An optical pickup has a lens actuator, at least one suspension wire having a first end and an opposite second end, the lens actuator being held by the wire at the first end, and a support base to which the wire is fixed at the second end. The support base has at least one cutaway section provided as corresponding to the wire, having a concavity to receive at least partially the wire in cross section orthogonal to a longitudinal direction of the wire, the concavity curving in a direction parallel to the cross section of the wire, and a land formed around the cutaway section, the wire being soldered to the land at the second end while the wire is being received at least partially by the concavity.