Projection Lens Module: Focus-Linked Stray Light Shielding
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing projection devices suffer from stray light issues that affect the viewing experience due to manual installation or removal of shielding plates, increasing device volume and reliability concerns.
Innovation Solution
A projection lens module with a shielding member connected to a focus ring, allowing it to move in the same direction as the focus ring without changing the relative distance on the optical axis, ensuring continuous blocking of stray light during focal length adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a shielding plate is used to block stray light, then the optical quality is improved, but the device volume increases and reliability decreases due to manual installation requirements
Solution Approach 1:
The shielding member is merged with the focus ring through a connection structure, forming an integrated assembly where the shielding member moves synchronously with the focus ring during focal length adjustments. This eliminates the need for separate manual installation and removal operations, improving reliability while reducing operational complexity.
Solution Approach 2:
The shielding member is designed to be dynamically connected to the focus ring, allowing it to move automatically as the focus ring rotates. This dynamic connection enables the shielding member to maintain its blocking function throughout the entire focusing range without requiring manual repositioning, thereby improving reliability and reducing device complexity.
2Reliability
If a shielding plate is manually installed to block stray light, then the optical quality is improved, but the ease of operation deteriorates due to manual installation and removal requirements
Solution Approach 1:
The shielding member is combined with the focus ring into a single operational unit. When the user rotates the focus ring to adjust focal length, the shielding member automatically moves to the correct position without requiring separate manual installation or removal steps, significantly improving ease of operation while maintaining optical quality.
Solution Approach 2:
The shielding member serves itself by being automatically positioned through its connection to the focus ring. During focusing operations, the shielding member self-adjusts its position to continuously block stray light without requiring external manual intervention, making the system easier to operate.
3Ease of operation
If the shielding member is fixed during focal length adjustment, then the ease of operation is improved, but the optical quality deteriorates due to insufficient stray light blocking
Solution Approach 1:
The shielding member is designed with dynamic movement capability through its connection to the rotating focus ring. As the focus ring rotates to change focal length, the shielding member automatically adjusts its position to maintain effective stray light blocking, ensuring optical quality is preserved while keeping operation simple.
Solution Approach 2:
The connection between the shielding member and focus ring creates a mechanical feedback system where the position of the focus ring directly determines the position of the shielding member. This feedback mechanism ensures the shielding member is always in the correct position to block stray light for the current focal length setting.
4Adaptability or versatility
If the shielding member moves independently from the focus ring, then the adaptability is improved, but the device complexity increases due to additional movement mechanisms
Solution Approach 1:
The shielding member's movement is merged with the focus ring's rotation through a direct connection structure. This integration allows the shielding member to adapt to different focal lengths automatically without requiring independent movement mechanisms, maintaining low device complexity while achieving high adaptability.
Data Source
AI summary
A projection lens module including a lens barrel, a lens element assembly, a focus ring and a shielding member is provided. The lens barrel has an accommodation space and a light exit opening. The lens element assembly is disposed in the accommodation space. The focus ring is disposed on an outer side of the lens barrel, and the focus ring is configured to drive the lens barrel to rotate relative to an optical axis of the lens element assembly. The shielding member is disposed on the outer side of the lens barrel. The shielding member is connected to the focus ring and covers a part of the light exit opening of the lens barrel. The shielding member is configured to move in a first direction with the focus ring, and a relative distance between the shielding member and the focus ring on the optical axis is unchanged.