Optical Unit Reflective Portion Fixing via Emboss Processing
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Solution Overview
Problem
Conventional optical units with shallow slits for fixing reflective portions to movable bodies suffer from insufficient fixing force, leading to the reflective portion potentially coming off the movable body.
Innovation Solution
The optical unit employs emboss processing on the reflective surface contact surface and side surface contact surface of the movable body, and forms a step as an adhesive reservoir to increase the frictional force and adhesive strength, thereby preventing the reflective portion from coming off.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a shallow slit is formed in the movable body to fix the reflective portion, then the structure is simple and easy to manufacture, but the fixing force is insufficient and the reflective portion may come off
Solution Approach 1:
The invention transitions from a shallow slit (2D surface feature) to an embossed pattern with depth (3D surface feature). The embossed pattern forms a recessed portion that receives adhesive, creating a three-dimensional bonding interface that significantly increases fixing force while maintaining manufacturing simplicity through standard embossing processes.
Solution Approach 2:
The invention changes the geometric parameters of the bonding interface by forming an embossed pattern with specific depth and area characteristics. The recessed portion has a depth that is 1/10 to 1/2 of the width, creating optimal parameters for adhesive retention and bonding strength while avoiding excessive complexity.
2Strength
If emboss processing is applied to increase frictional force and prevent detachment, then the fixing force is significantly increased, but the manufacturing process becomes more complex
Solution Approach 1:
The invention optimizes the embossed pattern parameters by controlling the depth to be 1/10 to 1/2 of the width, creating a recessed portion that effectively retains adhesive without requiring overly complex structures. This parameter optimization achieves strong fixing force while keeping the manufacturing process relatively simple.
3Strength
If a step is formed to create an adhesive reservoir, then the adhesive strength is increased, but the device structure becomes more complex
Solution Approach 1:
The invention creates a three-dimensional adhesive reservoir by forming a step structure with a recessed portion. This vertical dimension allows adhesive to be trapped and distributed over a larger area, significantly increasing bonding strength while the step structure itself remains a relatively simple geometric feature that can be integrated into existing components.
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
The increased frictional force and adhesive strength effectively prevent the reflective portion from detaching from the movable body, ensuring stable operation of the optical unit.
Implementation Method 1
Applying emboss processing significantly increases a frictional force. Thus, it is possible to prevent the reflective portion from coming off the movable body.
Implementation Method 2
an adhesive reservoir is formed in the step. According to the present aspect, the movable body includes a step serving as an adhesive reservoir formed by the housing surface of the reflective portion
Implementation Method 3
The movable body fixes the reflective portion by thermal caulking on a side surface contact surface
Data Source
AI summary
An optical unit includes: a reflective portion that reflects, on a reflective surface, an incident light flux incident from the outside in a reflection direction toward an imaging element from an incident direction; a movable body to which the reflective portion is fixed; and a fixed body. In the movable body, emboss processing is applied to at least one of a reflective surface contact surface in contact with the reflective surface, and a side surface contact surface in contact with a side surface of the reflective portion on a side of an intersecting direction intersecting with the incident direction and the reflection direction.