Fixed-Focus Projection Lens with Bonded Compound Groups
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional fixed-focus lenses for projectors are large, heavy, and costly due to multiple lens groups, which hinders their portability and optical performance.
Innovation Solution
A fixed-focus projection lens design featuring a first lens group with a plastic meniscus lens and a second lens group comprising multiple glass and plastic lenses, optimized for refractive power and bonding to reduce size and weight while maintaining high optical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional fixed-focus lenses use three or more lens groups with multiple separated lenses, then optical performance is improved, but the lens becomes huge and heavy
Solution Approach 1:
The patent merges multiple lens groups into a more compact configuration by bonding lenses together to form compound lenses. Specifically, the second lens (glass, positive power) is bonded to the third lens (plastic, negative power) to form a compound lens, reducing the number of separate lens groups from three or more to effectively two groups, thereby reducing weight and size while maintaining optical performance
Solution Approach 2:
The patent uses composite material construction by bonding glass lenses and plastic lenses together to form compound lenses. The second lens (glass) is bonded to the third lens (plastic), creating a composite optical element that combines the advantages of both materials - glass for high refractive index and plastic for lightweight properties - thus reducing overall lens weight while maintaining optical performance
2Reliability
If conventional fixed-focus lenses use three or more lens groups, then optical performance is improved, but the lens size increases
Solution Approach 1:
The patent merges multiple lens groups into a more compact configuration by bonding lenses together to form compound lenses. Specifically, the second lens (glass, positive power) is bonded to the third lens (plastic, negative power) to form a compound lens, reducing the number of separate lens groups from three or more to effectively two groups, thereby reducing volume while maintaining optical performance
Solution Approach 2:
The patent applies a nesting principle by integrating the third lens (plastic, negative power) directly onto the second lens (glass, positive power) to form a compound lens structure. This nested configuration allows the negative power lens to be positioned closely against the positive power lens, reducing the overall optical path length and volume compared to having separate lens groups
3Reliability
If conventional fixed-focus lenses use three or more lens groups, then optical performance is improved, but manufacturing time and cost increase
Solution Approach 1:
The patent merges multiple lens groups into a more compact configuration by bonding lenses together to form compound lenses. Specifically, the second lens (glass, positive power) is bonded to the third lens (plastic, negative power) to form a compound lens, reducing the number of separate lens groups from three or more to effectively two groups, thereby reducing manufacturing complexity and time while maintaining optical performance
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 design achieves a smaller, lighter lens with improved optical performance, demonstrated by reduced field curvature, distortion, and increased spatial frequency MTF, enhancing image quality and resolution.
Implementation Method 1
The first lens is a plastic lens and has a negative refractive power, and the second lens is a glass lens and has a positive refractive power
Implementation Method 2
The third lens is a plastic lens and has a negative refractive power; the fourth lens is a glass lens and has a negative refractive power
Implementation Method 3
the fifth lens is a glass lens and has a positive refractive power, the fifth lens and the fourth lens are bonded together to form a compound lens having a negative refractive power
Implementation Method 4
the fifth lens and the fourth lens are bonded together to form a compound lens
Implementation Method 5
the sixth lens is a plastic lens and has a positive refractive power, and the seventh lens is a glass lens and has a positive refractive power
Data Source
AI summary
A fixed-focus projection lens has a first lens group and a second lens group in sequence along an optical axis from a screen side to a light modulator side. The first lens group has a positive refractive power, and the second lens group has a positive refractive power. The first lens group has two lenses, and the refractive powers of the lenses are negative and positive. The second lens group has five lenses, and the refractive powers of the lenses respectively are negative, negative, positive, positive, and positive. The fixed-focus projection lens has the features of small size and high optical performance.