Optical Sensing Module Bracket Isolating Wall Light Interference
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Solution Overview
Problem
Conventional optical sensing modules suffer from light interference due to leaking light between cavities, which affects detection accuracy.
Innovation Solution
The optical sensing module incorporates a hollow bracket with an isolating wall and shading structures to completely isolate light-emitting and light-receiving components, preventing interference and enhancing detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a separation glue wall is used to divide the inner cavity into first and second cavities, then light interference between cavities is reduced, but light leakage still occurs affecting detection accuracy
Solution Approach 1:
The bracket's inner cavity is divided into a first cavity and a second cavity by an isolating wall that extends from the front surface to the rear surface of the bracket. This complete segmentation prevents light leakage between cavities, resolving the issue where partial separation (using only a glue wall) failed to eliminate light interference completely.
Solution Approach 2:
An isolating wall is introduced as an intermediary structure between the light emitting component and the light receiving component. This wall completely blocks light paths between the two cavities, acting as a mediator that eliminates light interference while allowing each component to function independently in its own cavity.
2Device complexity
If the bracket structure is simplified without isolating walls, then device complexity is reduced, but light leakage occurs between light emitting and light receiving components
Solution Approach 1:
The bracket incorporates an isolating wall that segments the internal space into distinct first and second cavities. This segmentation approach maintains structural simplicity while effectively preventing light leakage, demonstrating how segmentation can reduce device complexity by providing a clear spatial separation without requiring multiple separate components.
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 solution effectively prevents light leakage, improving detection accuracy and sensitivity by isolating the light-emitting and light-receiving components within the module.
Implementation Method 1
a light emitting diode (23), an infrared sensor (24)... The light emitting diode is disposed to a front surface of the circuit board. The light emitting diode is located in the first opening. The infrared sensor is disposed to the front surface of the circuit board. The infrared sensor is located in the second opening
Implementation Method 2
The isolating wall is located between the light emitting diode and the infrared sensor... to completely prevent a light interference
Data Source
AI summary
A handheld device casing includes a rear cover, an optical sensing module, a frame and a shell. The optical sensing module is disposed in the rear cover. The optical sensing module includes a bracket, a circuit board, a light emitting diode, an infrared sensor and a first shading structure. The bracket has an isolating wall. An inside of the bracket is separated into a first opening and a second opening by the isolating wall. The circuit board is disposed in the bracket. The light emitting diode is disposed to a front surface of the circuit board. The infrared sensor is located in the second opening. The first shading structure is disposed to an upper portion and an outer side of the first opening. The frame is disposed to a front surface of the rear cover. The shell is disposed to a front surface of the frame.