Optical Device Lens Shift Non-Telecentric Relay

Solution Overview

Problem

Commercially available lenses, which are not telecentric, cannot be used in projection type display apparatuses to achieve a lens shift function, as this requires a telecentric configuration.

Innovation Solution

An optical device is designed with a first non-telecentric image forming optical system and a telecentric optical system, allowing for image projection from the reduction side to the magnification side, with the optical systems being shiftable relative to the image display surface, enabling a lens shift function without requiring a telecentric lens.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If a commercially available non-telecentric lens is used, then cost is reduced and lens availability increases, but the lens shift function cannot be realized

Engineering Contradiction:

Improvelens availabilityVSAvoidlens shift function

Core Design Contradiction:

Ease of manufactureVSAdaptability or versatility

Solution Approach 1:

The optical system is divided into two separate optical systems: a first optical system (non-telecentric) for image formation and a second optical system (telecentric) for relay imaging. This segmentation allows each optical system to have specialized functions, enabling the lens shift capability through the telecentric second optical system while using affordable non-telecentric lenses for the first optical system.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The second optical system acts as an intermediary between the first optical system and the image display surface. It receives the image from the first optical system and relays it to the image display surface in a telecentric manner, enabling the lens shift function. The second optical system mediates the transition from non-telecentric to telecentric imaging.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Adaptability or versatility

If a telecentric lens is used to achieve lens shift function, then image positioning capability is improved, but cost increases and lens availability decreases

Engineering Contradiction:

Improvelens shift functionVSAvoidlens cost

Core Design Contradiction:

Adaptability or versatilityVSEase of manufacture

Solution Approach 1:

The optical system is divided into two separate optical systems: a first optical system (non-telecentric) for image formation and a second optical system (telecentric) for relay imaging. This segmentation allows each optical system to have specialized functions, enabling the lens shift capability through the telecentric second optical system while using affordable non-telecentric lenses for the first optical system.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The first optical system can be an interchangeable lens from commercial availability, while the second optical system provides the telecentric functionality needed for lens shift. This multi-functionality approach allows the use of standard, inexpensive lenses for the primary imaging function while adding telecentric capability through the second optical system.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Ease of operation

If a non-telecentric optical system is shifted relative to the image display surface, then vignetting occurs and image quality deteriorates

Engineering Contradiction:

Improveimage positioningVSAvoidvignetting

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The second optical system acts as an intermediary between the first optical system and the image display surface. It receives the image from the first optical system and relays it to the image display surface in a telecentric manner, enabling the lens shift function. The second optical system mediates the transition from non-telecentric to telecentric imaging.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

Instead of making the first optical system (image forming) telecentric, the patent inverts the approach by making the second optical system (relay imaging) telecentric. This inversion allows the lens shift function to be achieved through the second optical system without requiring the first optical system to have complex telecentric design.

Inventive Principle:

Principle #13The other way round (Inversion)

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

Enables the realization of a projection type display apparatus with a lens shift function using non-telecentric lenses, ensuring a favorable projected image without vignetting, and allowing for adjustable image positioning on a screen.

Implementation Method 1

a first optical system U1 and a second optical system U2, in order from the magnification side to the reduction side along an optical path

Methodology Applied

Scientific EffectRefraction: Refraction

Data Source

PatentUS20240073382A1Optical device, projection type display apparatus, and optical system

Publication Date: 2024.02.29 FUJIFILM CORP

AI summary

The optical device projects an image, which is displayed on an image display surface on a reduction side, to a magnification side. The optical device includes: a first optical system; and a second optical system, in order from the magnification side to the reduction side along an optical path. The first optical system is an image forming optical system which is not telecentric on the reduction side, the second optical system is telecentric on the reduction side, the first optical system is housed in a first lens barrel, and the second optical system is housed in a second lens barrel, and an optical system on the optical path from a surface closest to the magnification side in the first optical system to a surface closest to the reduction side in the second optical system is shift-able with respect to the image display surface.