Integrated Photodetector Lens Layout for Compact Light Control
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Solution Overview
Problem
Existing light emitting devices lack a compact design that incorporates a photodetector for efficient light management and control.
Innovation Solution
A small-sized light emitting device is designed with a photodetector and at least one lens member, where the photodetector has distinct light-receiving regions for each light-emitting element, and the lens member includes incident and exiting surfaces to collimate and direct light effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a photodetector is incorporated into the light emitting device for light management and control, then light control capability is improved, but device size increases
Solution Approach 1:
The patent combines the photodetector and lens member into a single integrated component structure. The lens member is positioned directly above the photodetector within the same housing, merging functions of light focusing and detection into a compact unified assembly that reduces overall device volume while maintaining light control capability
Solution Approach 2:
The patent nests the photodetector within the housing structure that also contains the lens member, with the photodetector positioned in a recessed area below the lens. This nested arrangement allows the detection function to be embedded within the existing optical path structure, minimizing additional space requirements
2Measurement precision
If distinct light-receiving regions are provided for each light-emitting element, then light reception precision is improved, but photodetector complexity increases
Solution Approach 1:
The photodetector is segmented into multiple distinct light-receiving regions (first light-receiving region and second light-receiving region), with each region corresponding to a specific light-emitting element. This segmentation allows precise detection of light from each element independently, improving measurement precision while using a single integrated photodetector component rather than multiple separate detectors
Solution Approach 2:
The single photodetector component performs multiple functions by incorporating different light-receiving regions that can detect light from different light-emitting elements. This multi-functional design achieves the precision of multiple separate detectors while reducing overall component count and structural complexity
3Productivity
If a lens member is added to collimate and direct light, then light emission efficiency is improved, but device complexity increases
Solution Approach 1:
The lens member is merged with the photodetector assembly, positioned directly above it within the same housing structure. This integration allows the lens to collimate and direct light from the light-emitting elements toward the photodetector without requiring separate mounting structures, reducing overall device complexity while improving light emission efficiency
Solution Approach 2:
The lens member acts as an intermediary component between the light-emitting elements and the photodetector, optimizing the optical path by collimating and directing light. This intermediary function improves light emission efficiency while the lens is positioned strategically within the existing structure to minimize additional complexity
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 device achieves efficient light control and management, allowing for a compact form factor while maintaining effective light emission and reception capabilities.
Implementation Method 1
The at least one lens member includes at least one incident surface and at least one exiting surface. The at least one incident surface is a surface on which a portion of the light emitted from the first light-emitting element and/or a portion of the light emitted from the second light-emitting element are incident.
Data Source
AI summary
A light emitting device includes: a first light-emitting element; a second light-emitting element; a photodetector having a light-receiving surface at an upper face thereof, the light-receiving surface including: a first light-receiving region configured to receive a portion of light emitted from the first light-emitting element, and a second light-receiving region configured to receive a portion of light emitted from the second light-emitting element; and at least one lens member having: at least one incident surface on which a portion of the light emitted from the first light-emitting element and/or a portion of the light emitted from the second light-emitting element are incident, and at least one exiting surface through which the portion of the light incident on the incident surface is emitted. In a top view, the lens member is disposed so as to overlap the upper face of the photodetector in part or in whole.