Optical Pickup Protrusion for Adhesive Positioning Stability
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Solution Overview
Problem
Adhesive-agent-based fixing of optical elements in optical pickups leads to position and angle shifts due to hardening, shrinking, and expansion over time and temperature changes, causing aberrations and making high-density recording difficult, and existing methods like using a wedge-form block and guidance plane are prone to adhesion failures and unintended adhesive placement.
Innovation Solution
The optical pickup design includes a protrusion portion on the housing that protrudes beyond the adhesive agents, ensuring stable adhesion by preventing unintended adhesive placement and deviations during the bring-in process, even with shifts in the holding position or jig rattle, using adhesive agents on both sides of the optical element with the protrusion portion positioned between them.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If adhesive agents are used to fix the optical element onto the housing, then the need for screw-fastening space is eliminated and small components can be fixed, but position shift and angle shift occur over time due to hardening, shrinking, and expansion of the adhesive agent
Solution Approach 1:
The protrusion portion is formed in advance on the housing at the precise position where the optical element should be mounted. This preliminary structural preparation ensures that when the adhesive agent is applied and the optical element is mounted, the protrusion portion provides a predetermined positioning reference that prevents position shift and angle shift, even as the adhesive undergoes hardening, shrinking, and expansion over time.
2Manufacturing precision
If a wedge-form block and guidance plane are used in the adhesion portion, then position shift of the optical element is reduced, but the adhesive agent may be whittled and dropped off or adhere to unintended positions due to shifts in holding position or jig rattle
Solution Approach 1:
The protrusion portion acts as an intermediary structure between the housing and the optical element. It provides a stable reference surface that guides the optical element into the correct position during mounting, while its design prevents the adhesive agent from being displaced or adhering to unintended positions, even when there are shifts in holding position or jig rattle during the assembly process.
3Ease of operation
If the optical element is brought down to the adhesion position using a jig, then the optical element can be positioned, but route deviations occur due to jig rattle causing adhesion failures
Solution Approach 1:
The protrusion portion is pre-formed on the housing at the exact target position for the optical element. During the mounting process, this protrusion portion serves as a predetermined guide that automatically corrects or compensates for route deviations caused by jig rattle, ensuring that the optical element is accurately positioned and adhered even when the bring-in route is not perfectly precise.
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 configuration ensures stable adhesion of optical elements, preventing position and angle shifts, and maintaining high-density recording reliability by preventing adhesive failures and ensuring accurate adhesion, even with minor deviations in the bring-in route.
Implementation Method 1
the optical element is fixed onto wall surfaces of the housing via adhesive agents
Data Source
AI summary
An optical pickup, including a housing, and an optical element mounted on the housing, wherein the optical element is fixed onto wall surfaces of the housing via adhesive agents on both sides of a certain single surface of the optical element, the optical pickup, further including a protrusion portion on the other side of a surface with the optical element positioned therebetween, the surface being orthogonal to the wall surfaces of the housing, the protrusion portion protruding from the housing, the front end of the protrusion portion protruding than the adhesive agents in a direction away from the wall surfaces.