Projection Optical Lens With Integrated Concave Reflector

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Solution Overview

Problem

Conventional optical systems for projectors face challenges in downsizing due to the need for separate components like collimating lenses and mirrors to direct and collimate light, which occupy significant space and cause light diffusion.

Innovation Solution

The use of an irregular-shaped lens with a concave reflecting surface and an exit surface allows for compact light collimation and direction change by internally reflecting light, reducing the need for separate mirrors and lenses.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If separate collimating lenses and mirrors are used to direct and collimate light, then light directionality and collimation are improved, but device size and complexity increase

Engineering Contradiction:

Improvelight directionalityVSAvoidnumber of optical components

Core Design Contradiction:

Illumination intensityVSDevice complexity

Solution Approach 1:

The patent combines the collimating lens and mirror into a single integrated optical component. The lens includes a collimating surface and a reflecting surface with a concave curved surface that is internally reflected, merging functions that traditionally required separate components. This reduces the number of parts while maintaining light directionality and collimation performance.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The integrated optical component performs multiple functions simultaneously: it collimates light, directs light in specific directions, and provides optical filtering. The single component replaces what would traditionally require separate collimating lenses, mirrors, and potentially filters, making the system more compact and efficient.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Illumination intensity

If separate collimating lenses and mirrors are used to direct and collimate light, then light directionality is improved, but device volume increases

Engineering Contradiction:

Improvelight directionalityVSAvoidoptical system volume

Core Design Contradiction:

Illumination intensityVSVolume of moving object

Solution Approach 1:

Inventive Principle:

Principle #5Merging (Combining)

3Illumination intensity

If conventional optical components are used to direct light, then light direction control is improved, but light diffusion increases

Engineering Contradiction:

Improvelight direction controlVSAvoidlight diffusion

Core Design Contradiction:

Illumination intensityVSObject-generated harmful factors

Solution Approach 1:

The patent employs a concave curved surface on the reflecting surface of the integrated optical component. This curved geometry allows for precise control of light rays, enabling directional control while minimizing diffusion. The specific curvature design ensures that light is reflected in a controlled manner, reducing unwanted scattering and diffusion that would occur with flat or irregular surfaces.

Inventive Principle:

Principle #14Spheroidality (Curvature)

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 configuration enables efficient light collimation and direction change in a compact form, minimizing space requirements and reducing light diffusion, thus allowing for a more compact optical system.

Implementation Method 1

a reflecting surface that has a concave curved surface and internally reflects light that has entered through the incident surface

Methodology Applied

Scientific EffectInternal reflection: Reflection

Data Source

PatentUS12429759B2Projection device

Publication Date: 2025.09.30 CASIO COMPUTER CO LTD

AI summary

A projection device includes an optical lens and a light source. The optical lens has an incident surface of light, a reflecting surface that has a concave curved surface and internally reflects light that has entered through the incident surface, and an exit surface of light that has been reflected by the reflecting surface. The light source that emits light that enters the optical lens.