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Title:
WEARABLE BAND
Document Type and Number:
WIPO Patent Application WO/2017/062022
Kind Code:
A1
Abstract:
In one example, a wearable band is described, which includes a carbon fiber composite layer formed by pre-impregnating a carbon fiber with a flexible heat-transfer substrate. The carbon fiber composite layer transfers at least a part of heat generated from a portable electronic device that is connected to the carbon fiber composite layer.

Inventors:
CHANG, Chi-Hao (10F-1, No. 66 Jingmao 2nd Road NanGang District, Taipei, Taipei, CN)
WU, Kuan-Ting (10F-1, No. 66 Jingmao 2nd Road NanGang District, Taipei, Taipei, CN)
YANG, Chien Lung (11445 Compaq Center Drive W, Houston, Texas, 77070, US)
Application Number:
US2015/054827
Publication Date:
April 13, 2017
Filing Date:
October 09, 2015
Export Citation:
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Assignee:
HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P. (11445 Compaq Center Drive W, Houston, Texas, 77070, US)
International Classes:
G06F3/00; G06F1/16
Domestic Patent References:
WO2011094875A12011-08-11
Foreign References:
US20020186535A12002-12-12
US20130087180A12013-04-11
US20070128384A12007-06-07
US6222114B12001-04-24
Attorney, Agent or Firm:
MAISAMI, Ceyda Azakli et al. (Hewlett-Packard Company, Intellectual Property Administration3404 E. Harmony Road, Mail Stop 3, Fort Collins Colorado, 80528, US)
Download PDF:
Claims:
WHAT IS CLAIMED IS:

1. A wearable band comprising:

a carbon fiber composite layer formed by pre-impregnating a carbon fiber with a flexible heat-transfer substrate, wherein the carbon fiber composite layer transfers at least a part of heat generated from a portable electronic device that is connected to the carbon fiber composite layer.

2. The wearable band of claim 1 , further comprising a thermal insulation layer disposed on an inner surface of the carbon fiber composite layer for contact with skin of a wearer.

3. The wearable band of claim 2, wherein the thermal insulation layer comprises at least one material selected from a group consisting of fiberglass, mineral wools, cellulose, calcium silicate, cellular glass, elastomeric foam, phenolic foam, vermiculite, polyurethane foam, and polystyrene foam in polymeric resins.

4. The wearable band of claim 3, wherein the mineral wools comprises at least one of ceramic fiber, glass and stone.

5. The wearable band of claim 1 , wherein the flexible heat-transfer substrate comprises at least one material selected from a group consisting of polyethylene terephthalate, polyethylene naphthalate, polyimide, synthetic paper,

polycarbonate, polyacrylics, polyurethane, poly (ether sulfone), rubber, polyolefin and elastic polymers.

6. The wearable band of claim i , wherein the carbon fiber comprises fibers having diameter in a range of 3-20 pm. density in a range of 1.7-2.2 g/cm3 and thermal conductivity in a range of 1800-1950 W/m-k.

7. The wearable band of claim 1 , wherein the carbon fiber composite layer is having thermal conductivity in a range of 200-660 W/m-k and density in a range of 1.4-1.5 g/cm3.

8. A wearable band comprising:

a carbon fiber composite layer formed by pre-impregnating a carbon fiber with a flexible heat-transfer substrate, wherein the carbon fiber composite layer comprises an inner surface; and

a thermal insulation layer disposed on the inner surface of the carbon fiber composite layer.

9. The wearable band of claim 8, wherein the flexible heat-transfer substrate comprises at least one material selected from a group consisting of polyethylene terephthalate, polyethylene naphthalate, polyimide, synthetic paper,

polycarbonate, polyacrylics, polyurethane, poly (ether sulfone), rubber, polyolefin and elastic polymers.

10. The wearable band of claim 8, wherein the thermal insulation layer comprises at least one material selected from a group consisting of fiberglass, mineral wools, cellulose, calcium silicate, cellular glass, elastomeric foam, phenolic foam, vermiculite, polyurethane foam, and polystyrene foam in polymeric resins, and wherein the mineral wools comprises at least one of ceramic fiber, glass and stone.

11. A wearable device comprising:

a portable electronic device; and

a wearable band coupled to the portable electronic device, the wearable band comprising:

a carbon fiber composite layer formed by pre-impregnating a carbon fiber with a flexible heat-transfer substrate, wherein the carbon fiber composite layer transfers at least a part of heat generated from the portable electronic device, and wherein the carbon fiber composite layer comprises an inner surface; and

a thermal insulation layer disposed on the inner surface of the carbon fiber composite layer for contact with skin of a wearer.

12. The wearable device of claim 11 , wherein the flexible heat-transfer substrate comprises at least one material selected from a group consisting of polyethylene terephthalate. polyethylene naphthalate, polyimide. synthetic paper, polycarbonate, polyacrylics, polyurethane, poly (ether sulfone), rubber, polyolefin and elastic polymers.

13. The wearable device of claim 11 , wherein the thermal insulation layer comprises at least one material selected from a group consisting of fiberglass, mineral wools, cellulose, calcium silicate, cellular glass, elastomeric foam, phenolic foam, vermiculite, polyurethane foam, and polystyrene foam in polymeric resins, and wherein the mineral wools comprises at least one of ceramic fiber, glass and stone.

14. The wearable device of claim 11 , wherein the portable electronic device comprises at least one of a display panel, a processing unit, a printed circuit board, a battery, means for wireless data exchange and a sensor.

15. The wearable device of claim 11 , wherein the wearable device is selected from a group consisting of a wearable camera, a smart watch, a global positioning system (GPS) tracking device, a weight/energy monitoring device, an emotion monitoring device, a gait/posture correction device, a sleep monitoring device, a fitness monitoring device and an outdoor navigation/tracking device.

Description:
WEARABLE BAND

BACKGROUND

[0001] Wearable technology is on the rise in personal and business use. Wearable devices, such as wrist-worn devices, may provide a plurality of functions. Example wearable devices include wearable cameras, smart watches, global positioning system (GPS) tracking devices, weight/energy monitoring devices, emotion monitoring devices, gait/posture correction devices, sleep monitoring devices, fitness monitoring devices, outdoor navigation/tracking devices and the like. Further, the wearable devices may include electronic components, such as processing unit, a display panel, electronic circuitry, battery, means for wireless data exchange, and/or sensors, which may generate heat. The heat generated by the electronic components in the wearable devices may affect lifetime and/or performance of the electronic components.

BRIEF DESCRIPTION OF THE DRAWINGS

[0002] Examples are described in the following detailed description and in reference to the drawings, in which:

[0003] Fig. 1 is a perspective view of an example wearable band illustrating carbon fiber composite layer;

[0004] Fig. 2 is a perspective view of an example wearable band illustrating a carbon fiber composite layer in combination with a thermal insulation layer;

[0005] Fig. 3 is an example wearable device including a wearable band; and

[0006] Fig. 4 is a partial sectional view of an example wearable device illustrating a wearable band and LED devices. DETAILED DESCRIPTION

[0007] The wearable devices may include electronic components, such as processing unit a display panel, electronic circuitry, battery, means for wireless data exchange, sensors and so on, that may generate heat. The heat generated by the electronic components in the wearable devices may affect lifetime and/or performance of the electronic components.

[00081 The present specification describes a wearable band for wearable device applications, the wearable band including a carbon fiber composite layer formed by pre-impregnating a carbon liber with a flexible heat-transfer substrate for dissipating heat from portable electronic devices that are connected to the carbon fiber composite layer. The term "pre-impregnating" may refer to obtaining an intimate bond between the carbon fiber and the flexible heat-transfer substrate. The term pre-impregnating may be used herein to describe a combination of the carbon fibers and a flexible heat-transfer substrate (i.e., resin) in a layer format, where the ratio of fiber to resin is controlled to have proper proportions to produce the intended structure. In one example, the flexible heat- transfer substrate may include thermally conductive materials exhibiting substantially high thermal conductivity and are flexible, compliant and/or soft in nature. The cooling of the wearable devices by removing the generated heat may improve lifetime and/or performance of the electronic components. Example wearable device include a wearable camera, a smart watch, a global positioning system (GPS) tracking device, a weight/energy monitoring device, an emotion monitoring device, a gait/posture correction device, a sleep monitoring device, a fitness monitoring device and/or an outdoor navigation/tracking device.

[0009] In one example, the portable electronic device can be coupled to the wearable band such that at least a portion of the carbon fiber composite layer is formed along a bottom surface of the portable electronic device. The wearable band can be detachably secured around a body part of the person. Example wearable band is a wristband. The wearable band may further include a thermal insulation layer disposed on an inner surface of the carbon fiber composite layer for contact with skin of a wearer. The thermal insulation layer may reduce the skin burning/irritation due to the generated heat.

[00010] Further, the present specification describes the carbon fiber composite layer with thermal conductivity in a range of 200-660 watts per meter kelvin (W/m-k) to provide effective heat dissipation from the portable electronic devices. Furthermore, the wearable band including the carbon fiber composite layer may enhance product lifetime for various components included in electronic devices, such as liquid crystal display (LCD) panels, light emitting diodes (LEDs), central processing units (CPUs), batteries and the like. The wearable band including the carbon fiber composite layer may further reduce the risk of any battery explosion due to overheating and further may alleviate overheating of LCD panels by reducing the LCD panel temperature to below skin temperature of about 40° C or lower. Moreover, the wearable band including the carbon fiber composite layer may improve information loading speed and power efficiency. The wearable band can be designed according to customized or personalized features. Also, the wearable band can be combined with internet of things (loT) technology (e.g., smart band and smart watch).

[00011] In the following description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the present techniques, it wiii be apparent, however, to one skilled in the art that the present apparatus, devices and systems may be practiced without these specific details. Reference in the specification to "an example" or similar language means that a particular feature, structure, or characteristic described is included in at least that one example, but not necessarily in other examples.

[00012] Turning now to the figures, Fig. i is a perspective view of an example wearable band 100 for wearable device applications illustrating a carbon fiber composite layer 102. The wearable band 100 includes the carbon fiber composite layer 102 formed by pre-impregnating a carbon fiber with a flexible heat-transfer substrate to transfer at least a part of heat generated from a portable electronic device 104 that is connected to the carbon fiber composite layer 102. Example flexible heat-transfer substrate includes polyethylene terephthalate, polyethylene naphthalate, polyimide, synthetic paper, polycarbonate, polyacrylics, polyurethane, poly (ether sulfone), rubber, polyolefin and/or elastic polymers. In one example, the carbon fiber may include the fibers having diameter in a range of 3-20 micrometer (μm), density in a range of 1.7-2.2 gram/cubic centimeter (g/cm 3 ), and thermal conductivity in a range of 1800-1950 W/m-k. Example carbon fiber is a super conducting carbon fiber (SSCF). The carbon fiber composite layer 102 may have thermal conductivity in a range of 200-660 W/m-k and density in a range of 1.4-1.5 g/cm 3 .

[00013] In one example, a carbon fiber is fabricated by chemical vapor deposition with fibers having diameter of about 3-5 pm and thermal conductivity of about 1950 W/m-k. Further, the carbon fiber is pre-impregnated with elastic polymers to form the carbon fiber composite layer, for example, with thermal conductivity in the range of 600-700 W/m-K and density in the range of 1.4-1.5 g/cm 3 .

[00014] Fig. 2 is a perspective view of an example wearable band 200 illustrating a carbon fiber composite layer 202 in combination with a thermal insulation layer 206. The wearable band 200 includes the carbon fiber composite layer 202 (e.g., the carbon fiber composite layer 102 as shown in Fig. 1). The carbon fiber composite layer 202 comprises an inner surface and an outer surface. As shown in Fig. 2, the wearable band 200 further includes the thermal insulation layer 206 disposed on the inner surface of the carbon fiber composite layer 202. The insulation layer 206 is disposed on the inner surface of the carbon fiber composite layer 202 such that the thermal insulation layer 206 is in contact with skin of a person wearing the wearable band 200. Example thermal insulation layer 206 includes fiberglass, mineral wools, cellulose, calcium silicate, cellular glass, elastomeric foam, phenolic foam, vermiculite, polyurethane foam, and/or polystyrene foam in polymeric resins. Example mineral wools include ceramic fiber, glass and/or stone. [00015] The thermal insulation layer 206 may reduce the skin burning/irritation due to heat generated from the portable electronic device 204 that is connected to the wearable band 200. For example, the thermal insulation layer 206 can have the same color as the carbon fiber composite layer 202. In one example, the portable electronic device 204 may be disposed/provided on the outer surface of the wearable band 200. For example, the portable electronic device 204 may be fastened to the outer surface of the wearable band 200 or may be clipped on to the outer surface of the wearable band 200. The wearable band 200 can be designed according to customized or personalized features such that the wearable band 200 can support different types of portable electronic devices. In one example, the wearable band 200 is flexible, i.e., the carbon fiber composite layer 202 and the thermal insulation layer 206 are made up of flexible materials. In another example, the wearable band 200 can be detachably secured around a body part of the wearer through a buckle or any other means.

[00016] Fig. 3 is an example wearable device 300 including a wearable band 302 (e.g., the wearable band 200 of Fig. 2). Example wearable device includes, but not limited to, a wearable camera, a smart watch, a global positioning system (GPS) tracking device, a weight/energy monitoring device, an emotion monitoring device, a gait/posture correction device, a sleep monitoring device, a fitness monitoring device and/or an outdoor navigation/tracking device. The wearable device 300 includes a portable electronic device 308. Example semiconductor elements/electronic components housed in the portable electronic device 308 include a central processing unit (CPU), a display panel, a printed circuit board, a battery, means for wireless data exchange, sensors and/or any other such heat generating components/devices. Example display panel includes, but not limited to, organic light-emitting diode (OLED), liquid-crystal-display (LCD), electro-wetting display, electrochromic display, and bi-stable display such as electrophoretic display, cholesteric liquid crystal display (ChLCD) and micro- electromechanical systems (MEMS) -based display. In one example, the semiconductor elements can be housed in a single compact module (i.e., the portable electronic device 308). In another example, a flexible circuit board with semiconductor elements/components covering the length of the wearable band 302 can be utilized. These electronic components may generate heat during operation.

[00017] The wearable device 300 further includes a wearable band 302 coupled to the portable electronic device 308. In one example, the wearable band 302 includes a carbon fiber composite layer 304 formed by pre-impregnating carbon fiber with a flexible heat-transfer substrate, The carbon fiber composite layer 304 transfers/dissipates at least a part of heat generated from the portable electronic device 308 to the surrounding air. For example, the carbon fiber composite layer 304 transfers/dissipates at least a part of heat generated from the portable electronic device 308 by conduction. In one example, the flexible heat-transfer substrate is made up of at least one material selected from a group consisting of polyethylene terephthalate, polyethylene naphthalate, polyimide, synthetic paper, polycarbonate, polyacrylics, polyurethane, poly (ether sulfone), rubber, polyolefin and elastic polymers.

[00018] Further, the wearable band 302 includes a thermal insulation layer 306 disposed on the inner surface of the carbon fiber composite layer 304 for contact with skin of a wearer. The thermal insulation layer 306 may reduce the skin burning/irritation due to heat generated from the portable electronic device 308. In one example, the thermal insulation layer 306 is made up of at least one material selected from a group consisting of fiberglass, mineral wools, cellulose, calcium silicate, cellular glass, elastomeric foam, phenolic foam, vermiculite, polyurethane foam, and polystyrene foam in polymeric resins. The mineral wools include ceramic fiber, glass and/or stone.

[00019] Fig. 4 is a partial sectional view of an example wearable device 400 illustrating a wearable band 402 and light-emitting diode (LED) devices 408. In the example shown in Fig. 4, the LED devices 408 are disposed within the wearable band 402, particularly disposed within the carbon fiber composite layer 404. Further, a thermal insulation layer 406 is disposed on an internal surface of the carbon fiber composite layer 404 such that the thermal insulation layer 406 is in contact with skin of a person wearing the wearable band 402 and protects the skin of the wearer from the heat generated by the LED devices 408. In one example, multiple electronic components (e.g., LEDS 408) can be disposed along the length of the wearable band 402 using a flexible circuit board.

[00020] In this manner, the present application discloses flexible heat transfer carbon fiber composite band for dissipating heat generated from electronic components housed in wearable devices. In one example, the portable electronic device (e.g., the portable electronic device 104, 204, 308 or 408) can be coupled to the wearable band (e.g., the wearable band 100, 200, 302 or 402) such that at least a portion of the carbon fiber composite layer is formed on and covers the bottom surface of the portable electronic device.

[00021] The foregoing describes novel structures for dissipating heat from wearable devices. While the above application has been shown and described with reference to the foregoing examples, it should be understood that other forms, details, and implementations may be made without departing from the spirit and scope of this application.