External Light Shutter Module for Projection Lens Contrast
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Solution Overview
Problem
Conventional projection systems have complex structures and high manufacturing costs due to intricate light shutter mechanisms, which fail to effectively enhance image contrast and result in unstable imaging quality.
Innovation Solution
An imaging system with a projection lens and a light beam modulation module comprising a fixed and movable light shutter, where the fixed shutter shields circumferential light and the movable shutter adjusts to further optimize contrast, positioned between the projection lens and light valve to simplify the lens structure and enhance image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a fixed light shutter is located inside the projection lens to shield circumferential dispersed light, then the contrast enhancement effect is improved, but the structure of the projection lens becomes complex and manufacturing cost increases
Solution Approach 1:
The light shutter is extracted from the projection lens and placed externally on the optical path. This separates the shutter function from the lens structure, simplifying the lens while maintaining the contrast enhancement capability through external light blocking.
Solution Approach 2:
A semi-transparent mirror is introduced as an intermediary component to redirect light between the light shutter and the projection lens. This allows the shutter to be positioned externally while still effectively controlling the light path and protecting the lens structure.
2Adaptability or versatility
If a movable light shutter is used to adjust contrast by moving into or away from the projection lens, then the contrast adjustment flexibility is improved, but the structural stability deteriorates and lens vibration occurs
Solution Approach 1:
The movable shutter is extracted from the projection lens assembly and positioned externally on the optical path. This eliminates the need for openings in the lens casing, maintaining structural integrity and stability while preserving contrast adjustment capability through external positioning mechanisms.
Solution Approach 2:
The semi-transparent mirror serves as a stable intermediary that redirects light to the externally positioned movable shutter. This configuration allows the shutter to move independently without affecting the projection lens stability, as the lens structure remains complete and sealed.
3Object-affected harmful factors
If multiple leaves are used in the light shutter to shield partial light beams, then the contrast improvement is enhanced, but the structure becomes complicated and manufacturing cost increases
Solution Approach 1:
The complex multi-leaf shutter mechanism is extracted and replaced with a simpler external shutter design that uses the semi-transparent mirror to achieve light blocking. This maintains contrast improvement capability while significantly simplifying the shutter structure and reducing manufacturing complexity.
Solution Approach 2:
The semi-transparent mirror acts as an intermediary that enables a single or fewer-number shutter element to achieve the light blocking effect previously requiring multiple leaves. The mirror redirects light around the shutter, allowing effective contrast improvement with reduced structural 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
The solution significantly improves image contrast and reduces manufacturing costs by effectively shielding dispersed light, maintaining structural integrity and stability of the projection lens, resulting in better imaging quality and lower production expenses.
Implementation Method 1
The fixed light shutter is disposed on the optical path of the image beam so as to shield off a portion of the circumferential light of the image beam
Implementation Method 2
The movable light shutter is suitable for moving into the optical path of the image beam so as to shield off another portion of the circumferential light of the image beam
Implementation Method 3
The projection lens is disposed on an optical path of the image beam, so as to project the image beam unto the screen
Data Source
AI summary
An imaging system suitable for projecting an image beam provided by a light valve unto a screen is provided. The imaging system includes a projection lens and a light beam modulation module. The projection lens is disposed on an optical path of the image beam, so as to project the image beam unto the screen. The light beam modulation module comprising a fixed light shutter and a movable light shutter is disposed between the projection lens and the light valve. The fixed light shutter is disposed on the optical path of the image beam so as to shield off a portion of the circumferential light of the image beam. The movable light shutter is suitable for moving into the optical path of the image beam to shield off another portion of the circumferential light of the image beam.