Five-Group Zoom Projection Lens for Brightness and Imaging Quality

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Solution Overview

Problem

Existing projection lenses struggle to meet the requirements of high brightness and zooming while maintaining projection imaging quality, particularly in varying environmental conditions.

Innovation Solution

A zoom projection lens design comprising a specific arrangement of lens groups, including a front fixed lens group, zoom adjusting lens group, and multiple zoom lens groups with varying diopters, to achieve 1<Ft/Fw<2 and 10<OAL/IMH<24, ensuring optimal imaging quality and aberration control.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If a projector lens is designed for high brightness projection, then the brightness of projection is improved, but the ability to zoom and adjust projection image size is compromised

Engineering Contradiction:

Improveprojection brightnessVSAvoidzoom capability

Core Design Contradiction:

Illumination intensityVSAdaptability or versatility

Solution Approach 1:

The lens is divided into multiple lens groups (first through fifth lens groups) with different diopter characteristics. The first lens group has positive diopter, the second has negative diopter, and the third through fifth have positive diopter. This segmentation allows each group to contribute differently to both brightness and zoom functionality, resolving the contradiction between high brightness and zoom capability.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent implements a dynamic zoom mechanism where the second lens group (with negative diopter) moves along the optical axis to change the projection image size. This dynamic adjustment capability is integrated into the high brightness lens design, allowing the system to maintain both high projection brightness and adjustable image size according to installation position requirements.

Inventive Principle:

Principle #15Dynamics

2Adaptability or versatility

If zooming capability is added to meet different installation positions, then adaptability is improved, but projection imaging quality deteriorates

Engineering Contradiction:

Improveinstallation position adaptabilityVSAvoidprojection imaging quality

Core Design Contradiction:

Adaptability or versatilityVSManufacturing precision

Solution Approach 1:

Different lens groups are assigned specific diopter characteristics tailored to their functional roles. The first lens group (positive diopter) handles initial light convergence, the second (negative diopter) provides zoom adjustment, and the third through fifth (positive diopter) refine the image. This local optimization of optical properties maintains high imaging quality across the zoom range.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent carefully controls specific optical parameters including the ratio of focal lengths (1 < Ft/Fw < 2) and the ratio of optical path length to image height (10 < OAL/IMH < 24). These parameter constraints ensure that zooming functionality does not compromise projection imaging quality, maintaining sharpness and clarity across different zoom levels.

Inventive Principle:

Principle #35Parameter changes

3Adaptability or versatility

If multiple lens groups are added to achieve both brightness and zoom, then functionality is improved, but lens complexity increases

Engineering Contradiction:

Improveprojection functionalityVSAvoidlens structure complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent combines multiple lens groups with different diopter characteristics into a single integrated optical system. The five lens groups work together in sequence, merging their individual functions (light convergence, zoom adjustment, image refinement) into a unified structure that achieves both high brightness and zoom capability without requiring separate systems.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The lens design creates a multi-functional optical system where the same lens groups serve multiple purposes: the first lens group contributes to both brightness and structural integrity, the second provides both zoom adjustment and optical path control, and the third through fifth groups handle both image quality maintenance and overall system compactness. This universality reduces the need for additional specialized components.

Inventive Principle:

Principle #6Universality (Multi-functionality)

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 lens design effectively maintains high brightness and zoom capabilities while controlling aberrations, spherical aberrations, and distortion within narrow ranges, enhancing projection imaging quality.

Implementation Method 1

a front fixed lens group, a zoom adjusting lens group, multiple zoom lens groups, and a rear fixed lens group

Methodology Applied

Scientific EffectRefraction: Refraction

Data Source

PatentUS20250298226A1Zoom projection lens

Publication Date: 2025.09.25 SUN YANG OPTICS DEV CO LTD

AI summary

A zoom projection lens sequentially comprising: a front fixed lens group, a zoom adjusting lens group, multiple zoom lens groups, and a rear fixed lens group, for satisfying 1<Ft/Fw<2 and 10<OAL/IMH<24, Ft is the focal length at the telephoto end, Fw is the focal length at the wide-angle end, OAL is the distance from the first lens of the lens to the focal plane, and IMH is the half height of the focal plane. Whereby, achieving a zoom projection lens meets the projection requirements of zoom projection and maintain the quality of projection imaging at the same time.