# US 11,076,759 B2 · Wearable device and operation method therefor

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- Number: US 11,076,759 B2
- Document ID: US11076759B2
- Status: Granted
- Kind: B2
- Application number: 16/066,260
- Filed: 2016-12-26
- Published: 2019-01-31
- Granted: 2021-08-03
- Earliest claimed: 2015-12-30
- Assignees: LG Innotek Co., Ltd.
- Applicants: LG Innotek Co., Ltd.
- Inventors: Chul Kim; Sang Hun Lee; Jin Ho Gwon
- Web page: https://patentgrep.com/patent/US11076759B2

## CPC

- A61B 5/0059: {using light, e.g. diagnosis by transillumination, diascopy, fluorescence (photoacoustic A61B5/0093; optical measurement of heart rate A61B5/02416; optical measurement of blood flow A61B5/0261; optical measurement of analytes A61B5/1455)}
- A61B 5/02427: {Details of sensor}
- A61B 5/02438: {with portable devices, e.g. worn by the patient}
- A61B 5/6801: {specially adapted to be attached to or worn on the body surface}
- A61B 5/681: {Wristwatch-type devices}
- A61B 5/7203: {for noise prevention, reduction or removal}
- A61B 5/7221: {Determining signal validity, reliability or quality (preventing, reducing or removing noise induced by motion artefacts A61B5/7207; noise originating from a therapeutic or surgical apparatus A61B5/7217)}
- A61B 5/7264: {Classification of physiological signals or data, e.g. using neural networks, statistical classifiers, expert systems or fuzzy systems}
- A61B 5/7225: {Details of analogue processing, e.g. isolation amplifier, gain or sensitivity adjustment, filtering, baseline or drift compensation (input circuits for detecting, measuring, or recording bioelectric or biomagnetic signals A61B5/30; specific diagnostic methods using bioelectric or biomagnetic signals A61B5/316)}
- A61B 2562/0233: Special features of optical sensors or probes classified in A61B5/00
- A61B 2562/0238: Optical sensor arrangements for performing transmission measurements on body tissue
- A61B 2562/028: Microscale sensors, e.g. electromechanical sensors [MEMS]
- A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D)

## Abstract

A wearable device according to an embodiment comprises: a substrate; a light-emitting unit disposed on the substrate; a light-receiving unit disposed on the substrate and spaced apart at a predetermined distance from the light-emitting unit; and a first reflection part disposed on the substrate adjacent to the light-emitting unit so as to reflect light emitted from the light-emitting unit.

## Claims

### Claim 1

A wearable device comprising:
a substrate;
a light emitter disposed on the substrate;
a light receiver disposed on the substrate and spaced at a predetermined distance apart from the light emitter;
a structure disposed on the substrate;
an optical window disposed on the structure and configured to protect the light emitter and the light receiver;
a first reflector disposed on the substrate adjacent to the light emitter;
a second reflector disposed at a location facing a light emitting surface of the light emitter and disposed at a lower surface of the optical window; and
a controller disposed on the substrate and configured to change reflection angles of the first and second reflectors,
wherein the first reflector is in direct contact with the lower surface of the optical window;
wherein the second reflector is in direct contact with a top surface of the substrate;
wherein the first reflector is disposed on a light reflection path of the second reflector and reflects light reflected via the second reflector to a measurement object,
wherein the light emitter generates light propagating in a first direction perpendicular to the measurement object, and
wherein the first reflector reflects the light propagating in the first direction to a second direction in parallel to the measurement object, and the second reflector reflects the light reflected in the second direction to a third direction corresponding to the measurement object,
wherein the controller is configured to classify combinations according to reflection angles of the first and second reflectors and determine reflection angles of the first and second reflectors within the classified combinations, and
wherein the controller is configured to determine reflection angles of the first and second reflectors such that an optical path of light passing through the measurement object within the classified combinations is minimized,
wherein the controller is configured to enter an angle setting mode of the first and second reflectors at time of initial wearing and time of re-wearing of the wearable device,
wherein the controller is configured to detect a signal-to-noise ratio of an optical signal received via the light receiver in a state of entering the angle setting mode; and
wherein the controller is configured to change the respective reflection angles of the first and the second reflectors to detect the signal-to-noise ratio of an optical signal received via the light receiver according to a combination of each of reflection angles, and set the respective reflection angles of the first and second reflectors based on a reflection angle corresponding to a greatest detected signal-to-noise ratio of the detected signal-to-noise ratios.

### Claim 2 (depends on 1)

The wearable device of claim 1, wherein the light emitter is configured such that the light emitting surface is located at a first side surface and a second side surface facing the first side surface is in direct contact with the substrate and disposed on the substrate.

### Claim 3 (depends on 1)

The wearable device of claim 1, wherein the first reflector includes a micro-electro-mechanical systems mirror (MEMS mirror).

### Claim 4 (depends on 1)

The wearable device of claim 1, wherein the light emitter includes a red light emitting diode.

### Claim 5 (depends on 1)

The wearable device of claim 1,
wherein the light receiver is disposed on the controller.

### Claim 6 (depends on 1)

The wearable device of claim 1, comprising
a partition wall disposed between the light emitter and the light receiver of the substrate and configured to divide an upper region of the substrate into a region in which the light emitter is disposed and a region in which the light receiver is disposed.

### Claim 7 (depends on 1)

The wearable device of claim 1, wherein the light emitter comprises:
a digital-to-analog converter configured to convert a digital signal output via the controller into an analog signal,
a first amplifier configured to primarily amplify the signal converted via the digital-to-analog converter,
a second amplifier configured to secondarily amplify the signal primarily amplified via the first amplifier, and
a light emitting element configured to generate light according to the signal secondarily amplified via the second amplifier.

### Claim 8 (depends on 1)

The wearable device of claim 1, wherein the light receiver comprises:
a light receiving element configured to receive light reflected from the measurement object,
a first amplifier configured to primarily amplify an optical signal incident via the light receiving element,
a second amplifier configured to secondarily amplify the signal primarily amplified via the first amplifier, and
an analog-to-digital converter configured to convert the signal secondarily amplified via the second amplifier into a digital signal.