Optical System Blocking Unit for Light Leakage Prevention
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Solution Overview
Problem
In compact optical systems, preventing light leakage is challenging due to the difficulty in mounting light traps for image units and projection lenses, especially when designs need to be modified for increased mobility and portability.
Innovation Solution
An optical system with a blocking unit, either a black blocking plate or a light-shielding coating on a mirror member, is integrated to partially block light from the source, featuring a transmission window or portion to expose the reflection surface, ensuring only necessary light reaches the image unit, thereby preventing stray light interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If light traps are mounted on image units and projection lenses to prevent light leakage, then light leakage is reduced, but device complexity increases and mobility is reduced
Solution Approach 1:
The blocking unit is integrated directly into the mirror member structure, combining the light blocking function with the existing optical component. This eliminates the need for separate light trap devices on image units and projection lenses, reducing overall device complexity while maintaining light leakage prevention
Solution Approach 2:
The light blocking function is extracted from the traditional light trap components and relocated to the mirror member in the illumination system. This extraction allows prevention of light leakage at its source rather than requiring multiple downstream light traps, simplifying the overall system
2Object-affected harmful factors
If light traps are mounted on image units and projection lenses to prevent light leakage, then light leakage is reduced, but the system volume increases reducing portability
Solution Approach 1:
The blocking unit is merged with the mirror member, utilizing the existing structural space. This integration avoids adding separate light trap components that would increase system volume, while still achieving light leakage prevention
Solution Approach 2:
The light blocking function is extracted and positioned upstream at the mirror member rather than requiring downstream light traps. This reduces the number of components needed and decreases overall system volume, enhancing portability
3Object-affected harmful factors
If a blocking unit is mounted on the mirror member to prevent light leakage, then stray light is reduced, but illumination intensity may be reduced
Solution Approach 1:
The blocking unit is designed with a transmission window that has the same area as the image unit, creating local differentiation in the mirror member. This allows selective blocking of only the stray light paths while maintaining full illumination intensity for the useful light that needs to reach the image unit
Solution Approach 2:
The mirror member is segmented into a blocking portion and a transmission window portion. This segmentation allows the system to differentiate between harmful stray light paths and useful illumination paths, blocking only the former while preserving the latter
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 solution effectively prevents light leakage by blocking excessive illumination, ensuring optimal light usage for image projection without increasing the system's volume, thus enhancing mobility and portability of optical systems.
Implementation Method 1
a blocking unit which is mounted to the mirror member of the illumination system and partially blocks light from the light source that is directed to the mirror member
Implementation Method 2
a transmission window which is formed through the blocking plate to have a predetermined area and through which a reflection surface of the mirror member is exposed
Data Source
AI summary
An optical system is provided which includes an illumination system with a light source, a lens member which guides light from the light source, and a mirror member; an image unit on which an image is formed and on which light from the illumination system is incident; a projection system which magnifies and projects the image formed on the image unit; and a blocking unit which is mounted to the mirror member of the illumination system and partially blocks light from the light source that is directed to the mirror member.