# US 2014/0152444 A1 · Apparatus for measuring driver's visual fatigue

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- Number: US 2014/0152444 A1
- Document ID: US20140152444A1
- Status: Published application
- Kind: A1
- Application number: 13/841,601
- Filed: 2013-03-15
- Published: 2014-06-05
- Earliest claimed: 2012-12-05
- Assignees: Hyundai Motor Company
- Applicants: Hyundai Motor Company
- Inventors: Hwal Ly Lee
- Web page: https://patentgrep.com/patent/US20140152444A1

## CPC

- G08B 21/06: indicating a condition of sleep, e.g. anti-dozing alarms
- G08B: SIGNALLING SYSTEMS, e.g. PERSONAL CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS

## Abstract

Disclosed herein is an apparatus for measuring a driver's visual fatigue. The apparatus includes a ground electrode that is mounted near the driver's ear, and a measuring electrode that is mounted near the driver's eye. Furthermore, the apparatus includes a controller that is configured to induce a resting potential using measured values of the ground electrode and the measuring electrode. When the resting potential is beyond a predetermined range, the controller is configured to determine the visual fatigue to be above a predetermined threshold and output a fatigue signal.

## Claims

### Claim 1

An apparatus for measuring a driver's visual fatigue comprising:
a ground electrode mounted at a location near the driver's ear;
a measuring electrode mounted at a location near the driver's eye; and
a controller configured to:
induce a resting potential using measured values of the ground electrode and the measuring electrode;
determine the visual fatigue to be above a predetermined threshold when the resting potential is beyond a predetermined range; and
output a fatigue signal.

### Claim 2 (depends on 1)

The apparatus according to claim 1, wherein the measuring electrode is mounted at a location between the driver's eye and nose.

### Claim 3 (depends on 1)

The apparatus according to claim 1, wherein the controller is configured to determine the visual fatigue to be above the predetermined threshold when the resting potential is below 1.6 mV or above 1.8 mV.

### Claim 4 (depends on 1)

The apparatus according to claim 1, wherein the controller is configured to output the fatigue signal when the resting potential is below 1.6 mV or above 1.8 mV for a certain length of time.

### Claim 5

An apparatus for measuring a driver's visual fatigue comprising:
a pair of spectacles having a nose pad, lenses, and temple arms;
a ground electrode disposed at an end of the temple arms at a location near the driver's ear;
a measuring electrode disposed at the nose pad at a location near the driver's eye; and
a controller configured to:
induce a resting potential using measured values of the ground electrode and the measuring electrode;
determine the visual fatigue to be above a predetermined threshold when the resting potential beyond a predetermined range; and
output a fatigue signal.

### Claim 6 (depends on 5)

The apparatus according to claim 5, wherein the measuring electrode comprises a plurality of electrode units disposed at a location near the left and right sides of the driver's eye, respectively.

### Claim 7 (depends on 5)

The apparatus according to claim 5, wherein the measuring electrode comprises a plurality of electrode units disposed at a location near the upper, lower, left, and right sides of the driver's eye, respectively.

### Claim 8

A non-transitory computer readable medium containing program instructions executed by a processor or controller, the computer readable medium comprising:
program instructions that induce a resting potential using measured values of the ground electrode and the measuring electrode
program instructions that determine the visual fatigue to be above a predetermined threshold when the resting potential beyond a predetermined range; and
program instructions that output a fatigue signal.