Projector Lens Sets with Extended Optical Paths for Uniform Illumination
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional projectors require a minimal distance between two lens sets to reduce volume, but existing methods fail to optimize the optical paths effectively, leading to inefficiencies in image projection.
Innovation Solution
The method involves defining specific optical paths between lens sets, with the first optical path longer than twice the focal length of the first lens set and the fourth optical path longer than twice the focal length of the second lens set, ensuring the light beam uniformly covers a digital micromirror device for optimal image projection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the distance between two lens sets is minimized to reduce projector volume, then the projector volume is reduced, but the optical path optimization is insufficient leading to non-uniform light coverage
Solution Approach 1:
The patent applies parameter changes by precisely controlling the optical path lengths (first optical path longer than twice the focal length of the first lens set, fourth optical path longer than twice the focal length of the second lens set) to achieve uniform light coverage while maintaining minimal distance between lens sets, thus resolving the contradiction between compact volume and optical precision
2Illumination intensity
If the optical path lengths are extended beyond twice the focal length of each lens set, then uniform light coverage is achieved, but the optical system becomes more complex
Solution Approach 1:
The patent changes the optical path length parameters to be longer than twice the focal length of each lens set, which creates uniform light coverage across the imaging device while maintaining a relatively simple optical system structure without requiring additional complex optical elements
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 approach reduces the projector's volume while ensuring uniform light coverage and optimal image brightness by controlling the lengths of the optical paths between the lens sets, enhancing the imaging method's efficiency.
Implementation Method 1
A light beam from the light source is converged in a first position to be a light spot and passes through the first lens set... The light spot is imaged in a first relay position via the first lens set
Implementation Method 2
The light beam is converged in a first position to be a light spot and passes through the first lens set, the second lens set... The light spot is imaged in a second lens set via the second lens set
Data Source
AI summary
An imaging method. A light beam passes through a first lens set, a second lens set, an imaging device and a projection lens set. The light beam is focused in a first position. The focused light beam converges in a first relay position via the first lens set and in a second relay position via the second lens set. The optical path from the first position to the principal plane of the first lens set is defined as a first optical path, and the principal plane of the second lens set to the second relay position as the fourth optical path. The length of the first optical path is longer than twice the focal length of the first lens set, and the length of the fourth optical path is longer than twice the focal length of the second lens set.