Hermaphroditic Cassette Optical Assembly for Compact Devices
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Solution Overview
Problem
Existing optical connectors face challenges in achieving reliable connections within smaller consumer electronic devices due to sensitivity to dust and contamination, requiring precise alignment and mechanical precision, which is difficult to maintain in compact designs like laptops and cell phones.
Innovation Solution
The development of optical assemblies with hermaphroditic cassettes and ferrule subassemblies that include a hood with narrower and wider sections, stop features, and flexible latching members, along with a ferrule installation tool, to facilitate secure and stable optical connections with reduced mechanical precision requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional optical connectors are used in compact devices, then precise alignment is required for reliable connection, but maintaining mechanical precision is difficult in compact designs
Solution Approach 1:
The optical connector is divided into a ferrule subassembly (containing optical waveguides) and a cassette (housing with alignment features). The ferrule subassembly can be pre-assembled and tested separately, then inserted into the cassette which provides the alignment interface. This segmentation allows precision to be achieved in the critical mating interface while the overall assembly can be compact.
Solution Approach 2:
The cassette acts as an intermediary between the ferrule subassembly and the connector housing. It includes alignment features such as guide pins, slots, and mechanical stops that ensure precise positioning of the ferrule relative to the mating connector, thereby achieving reliable alignment without requiring high precision in the final assembly step.
2Object-affected harmful factors
If expanded beam connectors are used to reduce sensitivity to contamination, then alignment tolerances can be relaxed, but the connector size increases
Solution Approach 1:
The optical beam parameters are modified by using lenses or prisms to expand the beam diameter at the air interface. This expanded beam is less sensitive to dust and contamination because the larger beam area distributes the optical power over more surface, reducing the impact of small contaminants. The beam is then recollimated or focused by mating lenses to maintain coupling efficiency.
Solution Approach 2:
The optical elements (lenses, prisms) are integrated within the compact ferrule subassembly structure. The ferrule contains the optical waveguides and coupling elements in a nested arrangement, allowing the expanded beam functionality to be achieved within a small form factor that can be accommodated in portable devices.
3Reliability
If complex assembly structures are used to achieve reliable optical connection, then connection stability improves, but assembly difficulty increases
Solution Approach 1:
The ferrule subassembly is pre-assembled with the optical waveguides and coupling elements in a controlled manufacturing environment where precision can be ensured. This pre-assembled unit is then designed to be easily inserted into the cassette using simple alignment features and snap-fit mechanisms, eliminating the need for complex assembly steps at the final assembly stage.
Solution Approach 2:
The cassette includes self-aligning features such as guide pins that fit into corresponding holes, slots that guide insertion, and mechanical stops that automatically position the ferrule subassembly correctly upon insertion. These features enable the assembly to self-align and self-secure without requiring complex adjustment mechanisms or skilled assembly operations.
Data Source
AI summary
An optical assembly includes a hermaphroditic cassette comprising a hood that includes a narrower section and a wider section. The narrower and wider sections are separated by slots such that the narrower section fits at least partially within a wider section of an identical mating hood of a mating optical assembly and the wider section receives a narrower section of the mating hood. The hood has first and second stop features configured to engage with second and first stop features of the mating hood. The first stop feature comprises a mating end of the narrower section of the hood and the second stop feature comprises a stop surface disposed within the wider section of the hood. Engagement of the stop features of the hood with stop features of the mating hood is configured to stop relative translational movement of the hood and the mating hood along the mating axis during mating.