Optical Pickup Yoke Design for Dust Protection and Skew Adjustment
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Solution Overview
Problem
Existing optical pickups require a protective cover to shield the movable unit from dust and damage, which increases costs and complexity due to the need for additional components and adjustment processes, while also exposing the unit to the optical disc side.
Innovation Solution
An optical pickup design featuring a yoke with opposing straight sections and bent sections that cover the movable unit except for the objective lens, allowing exposure without obstruction, and an ark-like support section for contact points, enabling skew adjustments with fewer components and processes, and a method of producing such a pickup with reduced assembly steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a protective cover is added to shield the movable unit, then the movable unit is protected from dust and damage, but the device complexity and component count increase
Solution Approach 1:
The yoke base is designed to perform multiple functions simultaneously: it serves as both the mounting structure for the objective lens and the protective cover for the movable unit. The bent sections of the yoke base extend to cover the movable unit, eliminating the need for a separate protective cover while maintaining structural integrity and protection functionality.
Solution Approach 2:
The yoke base is designed as a multi-functional component that provides both structural support for the objective lens and protective coverage for the movable unit. This universal design allows a single component to fulfill multiple roles, reducing the overall component count while maintaining protection capabilities.
2Reliability
If a protective cover is added to shield the movable unit, then the movable unit is protected from dust and damage, but the number of adjustment processes increases
Solution Approach 1:
The skew adjustment mechanism is integrated directly into the yoke base structure, allowing adjustment operations to be performed on the same component that provides protection. This integration eliminates the need for separate adjustment procedures for protective covers, reducing the total number of adjustment processes while maintaining protection functionality.
3Ease of operation
If the movable unit is exposed to the optical disc side, then the objective lens can operate without obstruction, but the movable unit becomes vulnerable to dust and foreign bodies
Solution Approach 1:
The yoke base provides selective coverage: it protects the movable unit components while leaving the objective lens exposed and accessible. The bent sections of the yoke base are positioned to cover specific areas where dust and foreign bodies could cause damage, while maintaining clear optical paths for the lens to function without obstruction.
Data Source
AI summary
An optical pickup includes an actuator having an objective lens and an optical base on which the actuator is supported. The actuator includes a yoke having an opening, a first straight section and an opposing second straight section, the opening being interposed between the straight sections, the first and second straight sections having a first and a second bent section, respectively, as an extension of each bent section. The yoke is formed as coving the actuator with the straight sections so that the objective lens is exposed through the opening without being obstructed by the optical base. The first bent section has one contact section whereas the second bent section has two contact sections. The optical base includes an ark-like support section. The optical base supports the actuator in such a way that the contact sections are made to have contact with the ark-like support section.