Projection Lens In-Situ Focus Adjustment Mechanism
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Solution Overview
Problem
Users of projection lenses must remove the lens from the projector body to adjust the distance between the focus optical system and the electro-optical device, increasing user burden and requiring multiple operations to achieve proper focus.
Innovation Solution
A projection lens design that includes a first focus optical system, a holding portion for attachment to the projector body, and an adjustment frame that allows the focus optical system to be adjusted without removing the lens from the projector body, enabling movement in specific directions relative to the holding portion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the projection lens is attached to the body portion with the focus optical system on the incident side, then the projection lens can be securely mounted, but the focus optical system protrudes into the body portion requiring the lens to be removed for adjustment
Solution Approach 1:
The adjustment frame is nested within the holding portion structure, allowing the focus optical system to be adjusted while remaining integrated with the projection lens assembly. The adjustment frame can move independently within the holding portion, enabling focus adjustment without removing the lens from the body portion.
2Manufacturing precision
If the focus optical system is positioned on the incident side of the projection lens, then the optical path is optimized, but the system requires removal of the lens for focus adjustment
Solution Approach 1:
The adjustment frame is designed to be movable relative to the holding portion, transforming the static focus adjustment process into a dynamic operation. The adjustment frame can be moved along the optical axis to adjust focus while the projection lens remains attached to the body portion, eliminating the need for repeated removal and reattachment.
3Ease of operation
If the adjustment frame is made movable relative to the holding portion, then in-situ focus adjustment is enabled, but the device complexity increases
Solution Approach 1:
The projection lens assembly is segmented into distinct functional components: the holding portion for mounting, the adjustment frame for focus control, and the focus optical system. This segmentation allows the adjustment frame to be independently movable while maintaining overall structural integrity, enabling focus adjustment without increasing overall device 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
This design allows users to adjust the focus without removing the projection lens, reducing user burden and simplifying the adjustment process by enabling in situ adjustments to the focus optical system.
Implementation Method 1
a first focus optical system that focuses an optical image
Data Source
AI summary
A projection lens, which is a projection lens to be attached to a projection apparatus body having an electro-optical device, includes: a first focus optical system; a first holding portion that has an attachment portion and on which light along a first optical axis extending in first directions is incident; and an adjustment frame that holds the first focus optical system. When one of the first directions is defined as a first A direction and the other of the first directions is defined as a first B direction, the first focus optical system is positioned further in the first A direction than the attachment portion, and light along the first optical axis travels in the first B direction. The adjustment frame is movable in the first directions relative to the first holding portion.