Auto-Focus Glasses Using Attention Depth Detection

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Solution Overview

Problem

Existing automatic focus-adjusting glasses require a camera to capture the pupil or rely on manual adjustment, limiting their practicality and effectiveness.

Innovation Solution

Incorporating an imager, variable focus lens, and a controller that uses depth and brightness variation analysis to automatically adjust the focal length based on user attention and object detection, enabling seamless focus adjustment without obstructing the field of view.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Extent of automation

If a camera is arranged to capture the pupil to detect line of sight, then automatic focus adjustment is enabled, but the field of view is obstructed

Engineering Contradiction:

Improveautomatic focus adjustmentVSAvoidfield of view

Core Design Contradiction:

Extent of automationVSArea of stationary object

Solution Approach 1:

The patent extracts the focus detection function from the optical path by using infrared imaging to detect the pupil position and line of sight without blocking the visible light path. The infrared camera captures pupil information separately, allowing automatic focus adjustment while maintaining an unobstructed field of view for the user.

Inventive Principle:

Principle #2Taking out (Extraction)

2Ease of operation

If manual adjustment is used to change focal length, then practicality is improved, but automatic adjustment is not enabled

Engineering Contradiction:

ImprovepracticalityVSAvoidautomatic focus adjustment

Core Design Contradiction:

Ease of operationVSExtent of automation

Solution Approach 1:

The system performs self-service by automatically detecting the user's line of sight through pupil tracking and autonomously adjusting the focal length without requiring manual input. The glasses themselves determine when focus adjustment is needed and execute the adjustment, combining automatic operation with practical usability.

Inventive Principle:

Principle #25Self-service

3Measurement precision

If brightness variation analysis is used to determine attention position, then focus adjustment accuracy is improved, but processing complexity increases

Engineering Contradiction:

Improveattention position detection accuracyVSAvoidprocessing complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent applies partial action by analyzing brightness variation only in specific regions of interest rather than processing the entire image. By focusing computational resources on detecting brightness changes in the pupil area and surrounding regions, the system achieves accurate attention position detection while keeping processing complexity manageable.

Inventive Principle:

Principle #16Partial or excessive action

Data Source

PatentUS12547053B2Automatic focus-adjusting glasses, control method of automatic focus-adjusting glasses, and non-transitory storage medium

Publication Date: 2026.02.10 JVC KENWOOD CORP

AI summary

Automatic focus-adjusting glasses includes an imager configured to be capable of acquiring image information; a variable focus lens configured to be capable of changing a focal length; a depth-information acquiring unit configured to acquire depth information of each position of the image information acquired by the imager; an attention-position determining unit configured to determine an attention position in the image information acquired by the imager; a depth-information identifying unit configured to identify a depth of the attention position based on the attention position in the image information determined by the attention-position determining unit and the depth information; and a focal-length controller configured to set a focal length of the variable focus lens based on the depth of the attention position.