Image Sensor Board Retaining Plate Tension Management
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Solution Overview
Problem
The existing image sensor technology is affected by tension applied during the fastening of the sensor board to the sensor frame, leading to variations in sensor IC characteristics.
Innovation Solution
The image sensor design incorporates a board retaining plate with a stepped portion and a reference surface that contacts the sensor board, allowing it to be fixed to the casing without significant tension, thereby stabilizing the sensor board and light receiver.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the sensor board is fastened directly to the sensor frame using screws, then the sensor board is securely fixed, but tension is applied to the sensor ICs causing characteristic variations
Solution Approach 1:
A board retaining plate is introduced as an intermediary component between the sensor board and the sensor frame. The retaining plate has a stepped portion that contacts the sensor board and a reference surface that is fastened to the sensor frame, thereby mediating the fixing process and preventing direct tension application to the sensor ICs.
Solution Approach 2:
The fixing structure is segmented into multiple components: the sensor board, the board retaining plate, and the sensor frame. This segmentation allows the fixing function to be separated from the tension application, with the retaining plate bearing the fastening load while the sensor board remains tension-free.
2Device complexity
If the sensor board is fastened directly to the sensor frame, then the assembly is simple, but the sensor IC characteristics vary due to applied tension
Solution Approach 1:
The board retaining plate serves as a mediator that adds a simple intermediate structure to the fastening system. This additional component, while increasing structural complexity, actually simplifies the overall design by providing a dedicated tension-bearing element and eliminating the need for complex tension-compensation mechanisms.
3Force
If screws are used to fasten the sensor board directly to the sensor frame, then the fastening is strong, but the sensor ICs are subjected to tension causing characteristic changes
Solution Approach 1:
The board retaining plate acts as a force-mediating component that receives the fastening force from the screws through its reference surface and transfers it to the sensor frame, while its stepped portion provides a tension-free contact interface with the sensor board, thereby preserving manufacturing precision.
Solution Approach 2:
The force transmission path is segmented into two separate interfaces: one between the retaining plate and the sensor frame (bearing fastening force), and another between the retaining plate and the sensor board (providing support without tension). This segmentation prevents force-induced characteristic changes in the sensor ICs.
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 that the image sensor characteristics remain stable and unaffected by tension, maintaining high positional accuracy and preventing variations during fastening.
Implementation Method 1
light reflected by the object to be read is focused through a focusing optical system
Implementation Method 2
light reflected by the object to be read is focused through a focusing optical system, such as a lens
Implementation Method 3
light receiver configured to receive light focused by the focusing optical system
Data Source
AI summary
An image sensor includes: a lens configured to focus light irradiated toward an object to be read and reflected by the object to be read; a sensor configured to receive light focused by the lens; a sensor board configured to mount thereon the sensor; a board retaining plate, having a casing attachment surface extending in the X direction and a sensor board attachment reference surface that is in contact with the +Y side of the sensor board and is formed in a side surface of the casing attachment surface, and configured to retain the sensor board; and a first casing configured to fix or retain the board retaining plate by fastening of a surface of the casing attachment surface.