Light Source Module Stray Light Shielding
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In laser light source modules, stray light reflected back by the optical system can cause heat accumulation on the collimating lens, leading to adhesive degradation, especially in miniaturized designs where the adhesive area is larger relative to the lens, resulting in reduced reliability.
Innovation Solution
A light-shielding member is integrated into the light source module, positioned between the collimating lens and the base, overlapping with the adhesive area to block stray light and prevent heat accumulation, thereby enhancing the reliability of the module and projection device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the light source module is miniaturized, then the size of the module is reduced, but the proportion of the adhesive area increases, making it easier for stray light to irradiate the adhesive and causing heat accumulation that accelerates adhesive degradation
Solution Approach 1:
The patent divides the base into two distinct regions: a light transmitting region and a non-light transmitting region. The adhesive is specifically placed on the non-light transmitting region, which is positioned away from the direct path of stray light. This segmentation allows the adhesive area to be functionally separated from the heat-prone areas, enabling miniaturization while maintaining bonding reliability.
Solution Approach 2:
The patent introduces a light-shielding member as an intermediary element between the optical system and the adhesive region. This light-shielding member blocks stray light from reaching the adhesive, acting as a protective mediator that prevents heat accumulation on the bonding material while allowing the overall module to be miniaturized.
2Volume of moving object
If the collimating lens is made smaller to reduce module size, then the module is more compact, but the adhesive occupies a larger proportion of the area, increasing the risk of stray light irradiation and heat accumulation
Solution Approach 1:
The base is segmented into light transmitting and non-light transmitting regions, with the adhesive confined to the non-light transmitting region. This spatial segmentation ensures that even when the collimating lens is miniaturized, the adhesive remains in a protected zone that does not receive stray light, thereby preventing heat accumulation on the lens and maintaining temperature stability.
Solution Approach 2:
The light-shielding member serves as an intermediary that blocks stray light from reaching both the miniaturized collimating lens and the adhesive region. This mediator prevents the lens from accumulating excessive heat while maintaining the compact design.
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 light-shielding member effectively blocks stray light from reaching the adhesive, preventing degradation and improving the reliability of both the light source module and the projection device by reducing heat accumulation on the collimating lens.
Implementation Method 1
The light-shielding member is disposed in the non-light transmitting region and covers a part of the collimating lens, wherein a projection of the light-shielding member on the base and a projection of the adhesive on the base at least partially overlap
Data Source
AI summary
A projection device and a light source module having a light transmitting region and a non-light transmitting region, and including a base, a light-emitting element, a collimating lens, an adhesive, and a light-shielding member are provided. The light-emitting element is disposed on the base at a position corresponding to the light transmitting region for providing a light beam. The collimating lens is disposed on the base. The adhesive is disposed on the base at a position corresponding to the non-light transmitting region, and located between the collimating lens and the base to bond the collimating lens and the base. The light-shielding member is disposed in the non-light transmitting region and covers a part of the collimating lens. A projection of the light-shielding member and a projection of the adhesive on the base at least partially overlap. The light source module and the projection device have good reliability.