Imaging Cover Assembly Layout for Emitter-Receiver Light Isolation
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Solution Overview
Problem
Imaging devices are susceptible to signal interference due to self-emitted signals, which affect their imaging performance.
Innovation Solution
The imaging device incorporates a cover assembly with a spacer that separates the light emitting and receiving elements, using through holes and a sealing member to minimize mutual interference, and includes lens assemblies to optimize light transmission and reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the light emitting element and light receiving element are placed close together in the imaging device, then the device structure is compact, but signal interference occurs between the emitted and received light
Solution Approach 1:
The imaging device is divided into distinct functional regions: a light emitting region containing the light emitting element, and a light receiving region containing the light receiving element. These regions are spatially segmented and isolated from each other, preventing the emitted light from directly interfering with the light receiving element while maintaining a compact overall structure.
Solution Approach 2:
A light shield is introduced as an intermediary component between the light emitting element and the light receiving element. This light shield blocks the direct path of emitted light, preventing it from reaching the light receiving element and causing interference, thus solving the contradiction between compact structure and signal interference.
2Object-affected harmful factors
If the light emitting element and light receiving element are separated to reduce signal interference, then the imaging performance is improved, but the device structure becomes complex and bulky
Solution Approach 1:
The light emitting element and light receiving element are integrated onto the same substrate in adjacent regions, rather than being completely separated. This merging approach reduces the overall device complexity while still providing sufficient spatial separation to minimize signal interference, achieving a balance between compactness and performance.
Solution Approach 2:
Instead of separating the light emitting and light receiving elements only in the horizontal plane, the device utilizes vertical dimensionality by positioning elements at different heights and using a light shield that extends in multiple dimensions. This three-dimensional arrangement effectively reduces signal interference without significantly increasing the device's footprint or structural complexity.
3Object-affected harmful factors
If a light shield is added to block interference light, then signal interference is reduced, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The light shield is designed to perform multiple functions: it blocks interference light from reaching the light receiving element, provides structural support for mounting components, and helps define the optical paths. By combining multiple functions into a single component, the manufacturing process is simplified while still achieving effective interference reduction.
Solution Approach 2:
The light shield is implemented as a thin film or plate structure rather than a bulky three-dimensional component. This thin-film approach effectively blocks interference light while minimizing the addition of volume and complexity to the device, making the manufacturing process more straightforward and the device easier to assemble.
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 reduces signal interference by effectively isolating light emitting and receiving components, enhancing the imaging device's performance by minimizing mutual influence between emitted and received light.
Implementation Method 1
a light emitting element 20, the light emitting element 20 being connected to the substrate 10 and configured to emit the irradiating light
Implementation Method 2
a light receiving element 30, the light receiving element 30 being connected to the substrate 10 and configured to receive natural light and reflected light of the irradiating light
Data Source
AI summary
An imaging device includes a substrate, a light emitting member, a light receiving member, a cover assembly, and a sealing member. The cover assembly includes a cover plate, a side plate, and a spacer. The side plate cooperates with the cover plate to define a groove, the substrate cooperates with the cover assembly to seal the groove. The spacer is connected to the cover plate and the side plate and separates the groove to form a first space and a second space. A first through hole and a second through hole are defined by the cover plate and respectively communicate with the first space. The light emitting member is received in the first space, the light receiving member is received in the second space. A slot is recessed inwardly from an end surface of the spacer facing away from the cover plate. The sealing member is filled in the slot.