Sensor Window Cover Partition Wall Design
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Solution Overview
Problem
The sensor package experiences reduced sensing accuracy and reliability due to direct light entry from the light emitting device into the light receiving device, and diffused reflection issues, which are not effectively addressed by conventional partition walls that restrict light emission and complicate assembly.
Innovation Solution
A window cover with a partition wall formed by the light emitting device cover extending from the base, featuring a reflective coating layer, fine unevenness, and a concave receiving recess to minimize direct light entry and diffused reflection, while allowing easy assembly and installation of components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a partition wall is provided on the housing or printed circuit board to block direct light, then direct light entry is prevented, but light from total internal reflection and diffused reflection cannot be blocked, and light emission is restricted
Solution Approach 1:
The window cover is divided into multiple functional regions: a light emitting device cover extending in the light emission direction to block direct light, and a light receiving device cover extending in the opposite direction to block diffused reflection light. This segmentation allows each region to address specific light paths independently, resolving the contradiction between blocking direct light and maintaining diffused reflection light transmission.
Solution Approach 2:
Different portions of the window cover are given different local qualities and functions. The light emitting device cover has a specific structure to block direct light while allowing diffused light, while the light receiving device cover has a different structure to block diffused reflection light. This local differentiation enables precise control over light paths without restricting overall light emission.
2Measurement precision
If a partition wall is provided on the housing or printed circuit board, then direct light entry is blocked, but assembly becomes difficult and light control is restricted
Solution Approach 1:
The partition wall function is merged with the window cover structure itself. The light emitting device cover and light receiving device cover are integrated into the window cover assembly, eliminating the need for separate partition walls on the housing or printed circuit board. This merging simplifies assembly while maintaining the light blocking functions.
Solution Approach 2:
The window cover serves multiple functions simultaneously: it blocks direct light entry, blocks diffused reflection light, and facilitates easy assembly. The integrated structure of the light emitting device cover and light receiving device cover provides multi-functionality, resolving the contradiction between achieving sensing accuracy and maintaining ease of manufacture.
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 enhances sensing accuracy and reliability by preventing direct light entry and diffused reflection, simplifying assembly, and expanding the pointing angle of the sensor package, while maintaining efficient light transmission and emission.
Implementation Method 1
a partition wall provided between the light emitting device and the light receiving device
Implementation Method 2
light reflected from the inside of the window cover
Data Source
AI summary
The proposed technology relates to a window cover for a sensor package, in which a partition wall is provided between a light emitting device and a light receiving device to improve sensing accuracy and reliability of the sensor package. The proposed window cover includes: a base disposed in a direction in which light is emitted from a light source; a light emitting device cover extending from a first surface of the base and disposed at an upper portion of a light emitting device of the sensor package; and a light receiving device cover having the first surface of the base as a bottom surface thereof, and disposed at an upper portion of a light receiving device of the sensor package, wherein an outer circumference of the light emitting device cover extends in a direction opposite to the direction in which the light is emitted to form a partition wall.