Laser Projection Module Diffractive Optical Element Retention
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Solution Overview
Problem
Existing laser projection modules face issues with the diffractive optical element detaching due to its exposure and adherence to the frame, leading to instability and potential failure during operation.
Innovation Solution
The design incorporates a substrate assembly, lens barrel assembly, light source, diffractive optical element, and collimation element, where the diffractive optical element is securely positioned within the lens barrel assembly using a stop member and protection cover to prevent movement and detachment during laser emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the diffractive optical element is adhered to the frame by glue, then it can be mounted in place, but it tends to fall off and detach during operation
Solution Approach 1:
The lens barrel is divided into multiple segments including a lens barrel body, a stop member, and a protection cover. The stop member is inserted into the lens barrel body to form a receiving cavity that securely holds the diffractive optical element, separating the mounting function from the protective function and eliminating the need for glue adhesion.
Solution Approach 2:
The stop member is nested within the lens barrel body, and the diffractive optical element is nested within the receiving cavity formed by the stop member and lens barrel body. This nested structure provides secure mechanical retention without requiring additional adhesive materials.
2Ease of operation
If the diffractive optical element is exposed to the outside of the frame, then it can be accessed for assembly, but it is not protected and tends to move or detach
Solution Approach 1:
The stop member is pre-installed within the lens barrel body to form the receiving cavity before the diffractive optical element is placed. This preliminary action ensures that the element is immediately secured in the correct position during assembly, preventing movement or detachment while maintaining accessibility.
Solution Approach 2:
The receiving cavity is created at a specific location within the lens barrel by the stop member, providing localized secure retention for the diffractive optical element. This localized structure ensures the element remains stable in its specific position while allowing other parts of the lens barrel to remain accessible.
3Reliability
If a secure mounting structure is added to prevent detachment, then reliability improves, but device complexity increases
Solution Approach 1:
The stop member serves multiple functions: it forms the receiving cavity to hold the diffractive optical element, provides mechanical retention to prevent detachment, and maintains the optical alignment position. This multi-functionality achieves reliable element retention without adding excessive structural complexity.
Solution Approach 2:
The stop member and protection cover are integrated into the lens barrel assembly as a unified structure. The stop member is inserted into the lens barrel body, and the protection cover is fitted over the lens barrel, combining multiple protective and retention functions into a single integrated assembly that does not significantly increase overall 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
This configuration ensures the diffractive optical element remains securely in place, enhancing the stability and reliability of the laser projection module by preventing detachment and maintaining optical alignment, thus improving the module's operational performance.
Implementation Method 1
The light source is disposed on the substrate assembly, accommodated in the receiving cavity, and configured to emit laser to the receiving cavity
Implementation Method 2
The collimation lens is configured to collimate or concentrate the laser emitted from the light source of the projection module
Implementation Method 3
The diffractive optical element (DOE) is configured to project the collimated or concentrated laser into a laser pattern
Data Source
AI summary
A laser projection module is provided. The laser projection module includes a substrate assembly, a lens barrel assembly, a light source, a diffractive optical element and a collimation element. The lens barrel assembly includes a lens barrel and a stop member connected to the lens barrel. The lens barrel is disposed on the substrate assembly and configured to define a receiving cavity together with the substrate assembly. The light source is disposed on the substrate assembly, accommodated in the receiving cavity, and configured to emit laser to the receiving cavity. The diffractive optical element and the collimation element are accommodated in the receiving cavity. The light source, the collimation element and the diffractive optical element are sequentially disposed in an optical path of the light source. The stop member is configured to prevent the diffractive optical element from moving in a light-emitting direction of the laser projection module.