Optical Device Housing Adhesion and Positioning Precision
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Solution Overview
Problem
Existing camera modules face challenges in increasing precision in the positioning of optical system housings relative to sensor base bodies and enhancing the strength of attachment between these components.
Innovation Solution
The proposed optical device includes a first lens group with an optical axis, a held body such as a second lens group or an image sensor, and housings with specific contact and depression-defining faces. An adhesive is provided in a depression between these faces to securely attach the second housing to the first housing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an attaching member is injected between the housing inclined portion and the sensor base body, then the housings can be attached to each other, but the height and inclination of the optical system housing relative to the sensor base body cannot be positioned with high precision
Solution Approach 1:
The attachment structure is divided into two distinct functional zones: a first contact face for precise positioning (perpendicular to optical axis) and a second contact face for attachment (with depression for adhesive). This segmentation allows the positioning function and attachment function to be independently optimized, resolving the contradiction between positioning precision and attachment strength.
Solution Approach 2:
An adhesive is introduced as an intermediary substance in the depression formed by the depression-defining faces. This adhesive mediator provides strong attachment between the housings while allowing the contact faces to maintain precise positioning without being compromised by the adhesive application process.
2Reliability
If the attaching member is positioned between the housing inclined portion and the sensor base body, then the housings can be connected, but the interface area is small and attachment strength cannot be increased
Solution Approach 1:
The attachment interface is extended from a simple planar contact to a three-dimensional depression structure. The depression-defining faces create a volumetric attachment zone that increases the effective interface area for adhesive bonding, transforming a two-dimensional contact problem into a three-dimensional bonding solution.
Solution Approach 2:
The depression structure creates a nested configuration where the adhesive is contained within the depression formed by the depression-defining faces. This nesting increases the attachment interface area and provides mechanical interlocking, significantly enhancing attachment strength beyond what a flat interface could provide.
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 allows for improved precision in positioning and increased strength of adhesion between the housings, reducing variations and enhancing the overall performance of the camera module.
Implementation Method 1
an adhesive provided in the depression and attaching the second housing to the first housing
Data Source
AI summary
An optical device includes a first lens group having an optical axis; a held body being either a second lens group or an image sensor; a first housing holding the first lens group and having: a first contact face that is perpendicular to the optical axis; and a first depression-defining face that is positioned adjacent to, and behind, the first contact face and that is positioned radially inward upon moving closer to the first contact face; a second housing holding the held body and having: a second contact face that is in contact with the first contact face; and a second depression-defining face that is positioned adjacent to, and behind, the second contact face and that, in combination with the first depression-defining face, defines a depression; and an adhesive provided in the depression and attaching the second housing to the first housing.