Light Source Module with Static Diffuser for Miniaturization
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Solution Overview
Problem
Miniaturization of optical systems in portable projection apparatuses is hindered by the space required for motor-driven diffusers, which interfere with other components and limit design margin.
Innovation Solution
A light source module design where the diffuser is placed between the light source and reflector, with a drive mechanism positioned away from the reflector, allowing for increased layout space and reduced diffuser size by locating the diffuser at or near the focal points of lens elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a motor-driven diffuser is used to provide uniform illumination, then light uniformity is improved, but the device occupies layout space and interferes with other components
Solution Approach 1:
The patent replaces the motor-driven rotation mechanism with a static diffusion plate that achieves uniform illumination through its diffusive properties alone, eliminating the need for mechanical driving components and reducing layout space requirements
Solution Approach 2:
The invention extracts and removes the motor and drive mechanism from the diffuser assembly, keeping only the essential diffusion plate component that provides uniform light distribution without requiring active driving
2Illumination intensity
If a motor is used to drive the diffuser, then uniform illumination is achieved, but the motor takes up layout space and structurally interferes with other components
Solution Approach 1:
The patent eliminates the mechanical motor-driven system by using a static diffusion plate with optimized optical properties, thereby reducing device complexity and avoiding structural interference with adjacent components such as the reflection element adjusting mechanism
Solution Approach 2:
The motor and associated drive mechanisms are completely removed from the system, leaving only the passive diffusion plate that achieves uniform illumination through its material properties rather than active mechanical operation
3Illumination intensity
If the diffuser is positioned on the transmission path of the light beam, then uniform illumination is provided, but the design margin of the reflector is reduced
Solution Approach 1:
The diffusion plate is positioned at the focal point of the first lens element where the light beam converges, allowing the diffuser to work locally at this critical position while maintaining adequate design margin for the reflector by not occupying the entire transmission path
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 enhances the uniformity of the illumination light beam and increases the design margin of the reflector, facilitating the miniaturization of the optical system while reducing speckle phenomena and improving light emission uniformity.
Implementation Method 1
The first lens element is configured to focus the light beam on a first focal point
Implementation Method 2
The first diffuser is disposed between the first lens element and the reflector. The first diffuser includes a first diffusion plate and a first drive mechanism
Implementation Method 3
The reflector is disposed on a transmission path of the light beam
Data Source
AI summary
A light source module includes a light source, first and second lens elements, a reflector, and a first diffuser. The light source emits a beam focused by the first lens element on a first focal point. The reflector is disposed on a beam transmission path. The first lens element is between the light source and the reflector. The first diffuser is between the first lens element and the reflector and includes a first diffusion plate and a first drive mechanism. The first diffusion plate is at/near the first focal point. The beam is transmitted to the reflector by the first diffusion plate. The first drive mechanism is between the first diffusion plate and the first lens element, and moves/rotates the first diffusion plate. The second lens element has a second focal point, coinciding with the first focal point, at a light-incident side. The reflector is at the light-incident side.