Projector Optical Module with Integrated Wavelength Conversion and Dichroic Filter
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Solution Overview
Problem
Conventional laser projectors have high hardware costs and heavy weight due to numerous optical components, which result in increased noise and larger dimensions.
Innovation Solution
A projector design utilizing a light source module, a wavelength conversion module with a reflecting plate and annular wavelength conversion layer, collimator lenses, a dichroic filter, and a reflector to divide and mix beams with a minimal number of elements, allowing for cost-effective, noise-reduced, and compact construction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional alignment module uses multiple optical components including dichroic component and color wheel, then beam alignment and color conversion can be achieved, but hardware cost increases and weight increases
Solution Approach 1:
The patent combines the color wheel and dichroic component into an integrated wavelength conversion module. The color wheel is positioned at a 45-degree angle to the optical axis, with its surface coated with wavelength conversion materials. This merging eliminates the need for separate alignment components while maintaining beam alignment and color conversion functions, thereby reducing weight and hardware cost.
Solution Approach 2:
The wavelength conversion module serves multiple functions simultaneously: it acts as a beam splitter, a color conversion element, and an alignment reference. The color wheel's reflective surface and wavelength conversion coating enable it to direct beams, convert colors, and provide alignment references for the optical system, replacing multiple specialized components with a single multi-functional element.
2Reliability
If conventional alignment module uses large number of optical components, then complete beam path control is achieved, but device complexity increases
Solution Approach 1:
The patent merges multiple optical components into a compact integrated module. The color wheel is positioned to simultaneously perform beam splitting, color conversion, and alignment functions. The reflective surface and wavelength conversion coating are integrated on the same component, eliminating the need for separate dichroic mirrors and color conversion elements, thereby reducing device complexity while maintaining complete beam path control.
Solution Approach 2:
The patent utilizes the angular dimension by positioning the color wheel at a 45-degree angle to the optical axis. This angular arrangement enables the color wheel to simultaneously intercept beams from different directions, perform wavelength conversion, and redirect beams along the desired optical path, achieving complete beam path control with a single component rather than multiple aligned elements.
3Reliability
If conventional projector uses traditional alignment module with multiple components, then optical functions are complete, but dimensions increase
Solution Approach 1:
The patent integrates the color wheel, wavelength conversion layer, and alignment reference into a single compact module. The color wheel's reflective surface and wavelength conversion coating are combined on one component, eliminating the need for separate dichroic mirrors and color conversion elements. This integration significantly reduces the optical module's volume while maintaining complete optical functions including beam splitting, color conversion, and alignment.
Solution Approach 2:
The wavelength conversion module performs multiple optical functions within a compact form factor. The color wheel simultaneously acts as a beam splitter, wavelength converter, and alignment reference, eliminating the need for multiple specialized components. This multi-functionality enables complete optical functionality to be achieved in a reduced volume, making the projector more compact.
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 enables cost reduction, noise decrease, and miniaturization by using a dichroic filter to divide and mix beams with a minimal number of elements, providing efficient beam alignment and color mixing within a constrained space.
Implementation Method 1
The dichroic filter is disposed between the light source module and the first collimator lens. The dichroic filter is adapted to reflect a first part of the first beam to form a second beam and allow passing or detouring of a second part of the first beam to form a third beam.
Implementation Method 2
The wavelength conversion module includes a reflecting plate and a wavelength conversion layer, and the wavelength conversion layer is an annular structure disposed on the reflecting plate. The second beam is condensed by the first collimator lens and projected onto the wavelength conversion layer to excite a fourth beam.
Implementation Method 3
The third beam is condensed by the second collimator lens and projected onto the reflecting plate to reflect a fifth beam, and the fifth beam is sequentially reflected by the reflector and the dichroic filter to mix with the fourth beam.
Implementation Method 4
The first collimator lens is disposed on a position corresponding to the wavelength conversion module. The second collimator lens is disposed on a position corresponding to the wavelength conversion module. The second beam is condensed by the first collimator lens and projected onto the wavelength conversion layer.
Data Source
AI summary
A projector includes a light source module, a wavelength conversion module, a first collimator lens, a second collimator lens, a dichroic filter and a reflector. The light source module provides a first beam. The wavelength conversion module includes a reflecting plate and a wavelength conversion layer. The dichroic filter reflects a first part of the first beam to form a second beam, and a second part of the first beam can pass or detour the dichroic filter to form a third beam. The second beam is condensed by the first collimator lens and projected onto the wavelength conversion layer to excite a fourth beam. The third beam is condensed by the second collimator lens and projected onto the reflecting plate to reflect a fifth beam. The fifth beam is reflected via the reflector and the dichroic filter to mix with the fourth beam.