Optical Pickup Lens Holder Resilient Wire Deformation Prevention
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Solution Overview
Problem
Existing optical pickup devices face issues with resilient wires becoming excessively bent and plastic deformed due to external forces, leading to adhesion of the lens holder to the base member, which causes errors in disk detection and type identification, especially in high-temperature environments.
Innovation Solution
The optical pickup device incorporates a lens holder with a restricting abutting portion that contacts the movable base to restrict movement and an opposing abutting portion that maintains a gap with the unit chassis, preventing excessive deformation and adhesion, even when flux adheres to the chassis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the lens holder is allowed to move freely to enable focus and tracking correction, then the optical pickup can perform its function, but the resilient wires may become excessively bent and undergo plastic deformation when external forces act on the lens holder
Solution Approach 1:
The patent applies preliminary anti-action by providing a stopper that prevents the lens holder from moving beyond a predetermined position before excessive bending occurs. The stopper is positioned to contact the lens holder when it moves in a direction opposite to the disk, creating a preventive barrier against plastic deformation of the resilient wires before such deformation can happen
Solution Approach 2:
The patent implements preliminary action by pre-positioning the stopper at a location that corresponds to the yield point of the resilient wires. This allows the system to establish movement limits in advance during assembly, ensuring that the lens holder cannot reach positions that would cause irreversible deformation of the resilient supporting members
2Reliability
If a through-hole is provided in the base member to allow the lens holder to contact the stopper, then the lens holder movement can be restricted, but the resilient wires may become excessively bent and defective during assembly before the base member is mounted at the optical chassis
Solution Approach 1:
The patent resolves this contradiction by introducing a spatial dimension solution - positioning the stopper at a location that is offset from the direct path of lens holder movement during normal assembly. The stopper is arranged to only contact the lens holder when mounted on the optical chassis, not when the base member is being assembled separately. This dimensional arrangement prevents premature bending of resilient wires during assembly while still providing movement restriction when needed
3Ease of manufacture
If the lens holder is secured to the resilient wires during soldering, then the assembly is completed, but flux may adhere to the base member and cause adhesion in high-temperature environments
Solution Approach 1:
The patent applies the extraction principle by removing the lens holder from contact with the base member during high-temperature operations. The stopper mechanism ensures that the lens holder maintains a predetermined gap from the base member when mounted on the optical chassis, extracting it from the harmful thermal environment and preventing flux adhesion issues during disk detection and type identification
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 prevents excessive deformation of resilient supporting members and adhesion of the lens holder to the unit chassis, ensuring accurate disk detection and type identification, even under external forces and high-temperature conditions.
Implementation Method 1
a resilient supporting member that supports the lens holder
Implementation Method 2
an objective lens that opposes a disk
Data Source
AI summary
An optical pickup device is one in which a lens holder is held by a movable base by using a resilient wire. A restricting abutting portion is formed at a lower portion of the lens holder. When the lens holder moves excessively downward, the restricting abutting portion comes into contact with a stopper portion to restrict a downward movement of the lens holder, so that it is possible to prevent the lens holder from contacting a unit chassis. When the unit chassis is not mounted on the movable base, it is possible to prevent excessive flexing of the resilient wire caused when an opposing abutting portion of the lens holder comes into contact with the unit chassis.