Light Emitting Package Layout for Compact Optical Detection
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Solution Overview
Problem
Existing light emitting devices have limitations in reducing the size of their packages while maintaining effective optical control and photodetection functionality.
Innovation Solution
The design incorporates a light emitting device with a first reflecting surface that transmits and reflects light from a light emitting element, and a second reflecting surface that further reflects light, allowing for compact packaging and efficient light reception by a photodetector with overlapping light receiving regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a conventional optical unit configuration is used with a mirror and photodiode, then optical control functionality is maintained, but the package size cannot be reduced further
Solution Approach 1:
The patent combines multiple optical functions (light emission, light reflection, and light detection) into a single integrated optical unit. The light emitting element, optical member with reflecting surfaces, and photodetector are arranged in a compact configuration where the optical member serves as both a light guide and a reflective element, merging previously separate functional components into one unified structure that reduces overall package size while maintaining optical control capabilities
Solution Approach 2:
The patent utilizes three-dimensional spatial arrangement by positioning the photodetector on the back side of the optical member at a specific angle (e.g., 45 degrees) relative to the light emitting element. This angular and positional arrangement in multiple dimensions allows light to be reflected and detected within a compact footprint, effectively using spatial dimensionality to reduce package size while preserving optical functionality
2Volume of moving object
If the optical member is positioned closer to reduce package size, then package size is reduced, but light reception efficiency by the photodetector may be compromised
Solution Approach 1:
The patent optimizes specific geometric parameters of the optical system, including the angle of the reflecting surface (e.g., 45 degrees), the distance between the light emitting element and photodetector, and the position of the photodetector on the back side of the optical member. By carefully adjusting these parameters, the design achieves compact packaging while ensuring that reflected light efficiently reaches the photodetector, thereby maintaining light reception efficiency despite reduced package size
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 enables a reduction in the size of the light emitting device package while maintaining effective light emission and detection capabilities, allowing for more compact and efficient optical control.
Implementation Method 1
transmits part of a first light emitted from the light emitting surface
Implementation Method 2
reflects the rest of the first light in an upward direction
Implementation Method 3
reflects part or all of the first light passing through the first reflecting surface
Implementation Method 4
a first light receiving region configured to receive the first light reflected by the second reflecting surface
Data Source
AI summary
A package includes: a bottom portion having a mounting surface on which a light emitting element is arranged; and a lateral wall portion having a top surface and including: a lateral wall having a rectangular outer shape in a top view and surrounding the mounting surface, and a stepped portion formed along the lateral wall below the top surface. In the top view, the stepped portion includes a wide portion and a narrow portion that are two regions having different widths. The wide portion has a region on which a protecting element to protect the light emitting element is arranged and the narrow portion does not have the region on which the protecting element is arranged.