Projector Lens Barrel Segmentation for Position Accuracy
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Solution Overview
Problem
Existing projector designs face issues with position accuracy degradation due to deformation and thermal expansion, particularly in projection optical systems using short focus lenses, which affects the alignment of light modulating/combining and projection optical systems.
Innovation Solution
The projector design incorporates a lens barrel with separate fixation sections for the holding member and light modulating/combining optical system, allowing independent positioning and fixation, preventing interference from deformation or thermal expansion of other components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the optical component housing is fixed to the holding member which is fixed to the lens barrel flange, then the light modulating/combining optical system can be positioned relative to the projection optical system, but the position accuracy deteriorates due to deformation of the optical component housing and holding member under impact or thermal expansion
Solution Approach 1:
The lens barrel is divided into multiple independent fixation sections: a first fixation section for the holding member (which holds the optical component housing) and a second fixation section for the light modulating/combining optical system. This segmentation allows each component to be fixed independently, preventing deformation propagation from the optical component housing to the light modulating/combining optical system, thereby maintaining position accuracy under impact and thermal conditions.
2Device complexity
If the holding member extends in the optical axis direction to fix both the optical component housing and light modulating/combining optical system, then the structure is simplified, but the position accuracy deteriorates due to thermal expansion of the holding member
Solution Approach 1:
Instead of using a single extended holding member, the invention segments the fixation function into two separate fixation sections on the lens barrel: the first fixation section for the holding member and the second fixation section for the light modulating/combining optical system. This eliminates the thermal expansion issue of the extended holding member while maintaining structural simplicity through direct fixation to the lens barrel.
3Ease of manufacture
If the light modulating/combining optical system is fixed to the holding member, then the assembly process is simplified, but the position accuracy deteriorates due to deformation of the holding member under installation forces
Solution Approach 1:
The fixation process is segmented into two independent stages: first fixing the holding member to the first fixation section, then separately fixing the light modulating/combining optical system to the second fixation section. This segmentation isolates the installation forces from the light modulating/combining optical system, preventing position accuracy deterioration while maintaining assembly simplicity through sequential fixation.
Data Source
AI summary
In a projector, a first fixation section and a second fixation section are formed at two places located at a distance in an optical axis direction in a lens barrel of a projection optical system. A holding member has contact with the first fixation section from an optical axis direction-rear side, and is fixed, an optical component housing of an illumination light guide optical system has contact with the holding member from the optical axis direction-rear side, and is fixed. A light modulating/combining optical system for generating image light has contact with the second fixation section from the optical axis direction-rear side and is fixed. In other words, the light modulating/combining optical system is directly fixed to the lens barrel without the intervention of the holding member for fixing the illumination light guide optical system to the lens barrel.