Compound Aspherical Projection Lens Heat Resistance
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Solution Overview
Problem
Projection lenses for high brightness projection display devices face challenges with heat resistance, as existing aspherical lenses, such as plastic and compound aspherical lenses, suffer from performance changes and property alterations due to temperature fluctuations, leading to impaired projection performance.
Innovation Solution
A compound aspherical lens configuration with a resin layer on a glass lens, where the resin layer's surface is aspherical, is designed to meet specific conditional expressions for glass transition temperature, effective diameter, and axial marginal ray height, ensuring heat resistance and optimal optical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a plastic aspherical lens is used, then manufacturing cost is reduced and ease of manufacture is improved, but performance stability under temperature change deteriorates
Solution Approach 1:
The invention uses a compound aspherical lens combining a glass lens substrate with a resin layer coating. The glass lens provides thermal stability and structural integrity, while the resin layer provides aspherical surface precision. This composite structure resolves the contradiction by integrating materials with complementary properties - glass for temperature stability and resin for manufacturing ease and surface accuracy.
2Stability of the object's composition
If a glass aspherical lens is used, then performance stability under temperature change is improved, but manufacturing cost increases
Solution Approach 1:
The compound aspherical lens combines glass and resin materials to achieve both thermal stability and cost-effectiveness. The glass lens substrate ensures performance stability under temperature changes, while the resin layer can be applied through cost-effective coating processes rather than expensive glass molding, thus resolving the cost contradiction.
Solution Approach 2:
The invention applies the resin layer only on specific surfaces of the glass lens where aspherical precision is most needed, rather than making the entire lens from resin. This local application of different material properties optimizes both performance stability and manufacturing cost by using each material where it provides the most value.
3Ease of manufacture
If a compound aspherical lens with resin layer is used, then manufacturing cost is reduced compared to glass aspherical lens, but heat resistance deteriorates in high temperature environments
Solution Approach 1:
The invention carefully controls the thickness of the resin layer and selects resin materials with appropriate glass transition temperatures to maintain heat resistance. By optimizing these parameters, the compound lens achieves both cost reduction and adequate thermal performance for projection lens applications.
Solution Approach 2:
The glass-resin composite structure provides heat resistance through the glass substrate while maintaining manufacturing cost benefits through the resin coating. The glass lens core withstands high temperatures, while the thinner resin layer reduces manufacturing complexity compared to fully glass aspherical lenses.
4Reliability
If projection lens uses more lenses to achieve high resolving power and aberration correction, then optical performance is improved, but device complexity and number of components increases
Solution Approach 1:
The invention employs aspherical surfaces on the lens elements, which provide superior aberration correction compared to spherical surfaces. The aspherical shapes enable fewer lenses to achieve the same or better optical performance, reducing device complexity while maintaining high resolving power and corrected distortion.
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 solution provides a projection lens with sufficient heat resistance for high brightness applications, maintaining performance and cost-effectiveness while minimizing temperature-induced degradation.
Implementation Method 1
a compound aspherical lens in which a resin layer is formed on a surface of a glass lens and a lens surface of the resin layer on the air contacting surface side has an aspherical shape
Implementation Method 2
a compound aspherical lens in which a resin layer is formed on a surface of a glass lens and a lens surface of the resin layer on the air contacting surface side has an aspherical shape
Data Source
AI summary
A projection lens includes a compound aspherical lens in which a resin layer is formed on a surface of a glass lens and a lens surface of the resin layer on the air contacting surface side has an aspherical shape. If the glass transition temperature of the resin layer is taken as Tg and its unit is taken as ° C., Tg of at least one of the resin layers is 150<Tg<280. The projection lens is configured to satisfy a given conditional expression with respect to the at least one of the resin layers.