Optical Pickup Actuator Lens Holder Heat Dissipation and Bonding
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Solution Overview
Problem
Existing optical pickup actuators face issues with heat transmission from coils to the object lens, leading to increased aberration and potential cracking, as well as inadequate adhesive force between the lens holder and object lens, resulting in reduced driving reliability and resonance mismatch.
Innovation Solution
The optical pickup actuator incorporates recessed portions on the lens holder's side surfaces with heat discharge grooves and an enhanced bonding structure, including adhesive confining grooves and projections to secure the object lens, and separate coil-supporting portions with heat dissipation grooves to minimize heat transfer and improve adhesive strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the object lens is firmly fixed to the lens holder using adhesive, then the bonding strength is improved, but the resonance frequency mismatch between the lens holder and object lens increases
Solution Approach 1:
The lens holder is divided into a first lens holder and a second lens holder separated by a gap. The object lens is positioned between them, and both lens holders are fixed to the substrate. This segmentation allows independent resonance control of each lens holder while maintaining strong bonding to the object lens through the gap, resolving the contradiction between bonding strength and resonance matching.
2Productivity
If the coil current is increased to improve driving speed, then the productivity is improved, but the heat transmission to the object lens increases causing aberration and cracking
Solution Approach 1:
A heat dissipation structure with a gap is introduced between the coil and the object lens. The gap acts as a thermal barrier (intermediary) that reduces heat transmission to the object lens, allowing high coil current operation for improved driving speed without causing aberration or cracking.
Solution Approach 2:
The heat dissipation function is extracted as a separate structural feature (gap and heat dissipation structure) from the main optical path. This allows the optical components to operate at high speeds while the heat management function is handled independently by the gap structure.
3Stability of the object's composition
If the lens holder and object lens are rigidly connected, then the mechanical stability is improved, but the resonance peak synchronization between the two components deteriorates
Solution Approach 1:
The lens holder is segmented into two separate parts (first and second lens holders) with a gap between them. Both are independently fixed to the substrate, providing mechanical stability while allowing each to be optimized for resonance matching with the object lens, thus synchronizing resonance peaks.
Solution Approach 2:
Different regions of the lens holder structure have different properties: the gap region provides resonance isolation while the bonding regions provide mechanical stability. This local differentiation allows simultaneous achievement of mechanical stability and resonance synchronization.
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 heat transmission to the object lens, enhances the bonding force between the lens holder and object lens, and synchronizes their resonance peaks, thereby improving driving reliability and stability, especially during prolonged high-speed operations.
Implementation Method 1
When the electric current is applied to the coil, the optical pickup actuator moves the object lens to a desired location. At this point, the moving part moves in focusing and tracking directions that are perpendicular to each other.
Implementation Method 2
heat transmission from coils to the object lens, leading to increased aberration and potential cracking
Data Source
AI summary
There is provided an optical pickup actuator for actuating a lens holder having an object lens according to an interaction between coils and magnets. The optical pickup actuator includes a lens-seating portion formed on the lens holder to support the object lens and a lens guide portion protruding from the lens-seating portion to securely support the object lens. The lens guide portion has an adhesive confining groove in which adhesive can be injected to securely fix the object lens.