Beam Splitting Element With Diffuse Reflection for Compact Projection Optics
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Solution Overview
Problem
Conventional projection devices require additional optical elements for beam splitting and diffuse reflection, leading to increased complexity, cost, and volume, especially when different reflection ratios are needed.
Innovation Solution
A beam splitting element using an optical substrate with a diffuse reflection layer to split incident beams into two split beams with different or same field angles and parallel exit directions, integrated with a wavelength conversion element to simplify the light path and reduce manufacturing cost and volume.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional beam splitting and diffuse reflection are implemented using separate optical elements, then the projection device can achieve the required beam splitting and diffuse reflection functions, but the device complexity increases and the volume increases
Solution Approach 1:
The patent combines the beam splitting function and diffuse reflection function into a single integrated component. The beam splitting element includes a first surface for receiving incident beam and a second surface for outputting split beams, with a diffuse reflection layer integrated into the structure. This merging eliminates the need for separate beam splitter and diffuser components, thereby reducing device complexity while maintaining the required functional versatility.
Solution Approach 2:
The beam splitting element is designed to perform multiple functions simultaneously: it splits the incident beam into multiple split beams and provides diffuse reflection. The diffuse reflection layer is integrated within the beam splitting element, allowing it to serve as both a beam splitter and a diffuser, enhancing the multi-functionality of the optical system.
2Ease of manufacture
If additional optical elements are added for beam splitting and diffuse reflection, then the required optical functions are achieved, but the manufacturing cost increases
Solution Approach 1:
By merging the beam splitting and diffuse reflection functions into a single element, the patent reduces the total number of optical components that need to be manufactured and assembled. This integration directly reduces manufacturing cost by eliminating the need to produce and align multiple separate optical elements while maintaining the required optical performance.
3Volume of stationary object
If conventional separate optical elements are used for beam splitting and diffuse reflection, then the optical functions are achieved, but the projection device volume increases
Solution Approach 1:
The integration of beam splitting and diffuse reflection functions into a single compact element significantly reduces the volume occupied by the optical system. Instead of requiring separate components with associated mounting spaces and alignment pathways, the unified beam splitting element creates a more compact light path, thereby reducing the overall projection device volume.
4Device complexity
If a coated beam splitter is used to split the beam into two mirror reflection beams, then the beam splitting function is achieved, but the light path becomes highly complicated when diffuse reflection is added
Solution Approach 1:
The patent integrates the diffuse reflection layer directly into the beam splitting element, creating a unified structure that handles both beam splitting and diffuse reflection functions. This integration simplifies the light path by eliminating the need for separate optical components that would otherwise complicate the beam trajectory, while still allowing for controlled beam splitting ratios through the integrated diffuse reflection layer.
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 beam splitting element simplifies the light path, reduces manufacturing cost and volume by eliminating the need for additional optical elements, and enhances projection image uniformity through diffuse reflection.
Implementation Method 1
The optical substrate is configured to allow the incident beam to reflect or pass through
Implementation Method 2
The optical substrate is configured to allow the incident beam to reflect or pass through
Implementation Method 3
The diffuse reflection layer is disposed on a portion of a surface of the optical substrate
Data Source
AI summary
A beam splitting element as provided includes an optical substrate and a diffuse reflection layer. The optical substrate is configured to reflect or allow the incident beam to pass through. The diffuse reflection layer is disposed on a portion of a surface of the optical substrate. The incident beam is split into first and second split beams through the beam splitting element and satisfies one of the following conditions: field angles of the first and second split beams exit from the beam splitting element are different; the field angles of the first and second split beams exit from the beam splitting element are the same, and exit directions of the first and second split beams are parallel to each other. A projection device having the beam splitting element is also provided.