Thermal Resistance Model and Analysis for Future Smart Glasses

Matsuhashi, Kodai; Kanamoto, Toshiki; Kurokawa, Atsushi

doi:10.1109/impact47228.2019.9025000

Cited by 2 publications

(3 citation statements)

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“…Moreover, the temperature of the device surface touching skin that may cause a low-temperature burn even at 43 • C [32] was not analyzed. In Reference [33], we presented a thermal network model for thermal designs of future smart glasses. In this paper, we provide more detailed resistance models for all parts of devices, thermal properties that were used in the analysis, a difference in temperatures due to the position on the temple, more detailed explanations for each figure, motivations for this work, and discussions.…”

Section: Introductionmentioning

confidence: 99%

“…In the viewpoint of the safety and comfort of smart glasses, there are several issues such as weight [48,49], battery [50,51], AR/VR [52][53][54], and heat [31,33]. In Reference [48], regarding weight issues, the effect of weight balance for shutter glasses in terms of subjective discomfort and physical load on the nose has been investigated [48] and a user discomfort on the different wearing mode glasses with different support points has been presented [49].…”

Section: Introductionmentioning

confidence: 99%

“…AR/VR include many problems such as display size, resolution, computing capability, negative effects in some people with autism spectrum disorder, and architecture/server/network issues [52][53][54]. Moreover, it is necessary to ensure the safety and comfort due to heat generation [31,33] since smart glasses are worn on the face/head of the human body for use.…”

Section: Introductionmentioning

confidence: 99%

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Thermal Model and Countermeasures for Future Smart Glasses

Matsuhashi

Kanamoto

Kurokawa

2020

Sensors

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The market for wearable devices such as smart watches and smart glasses continues to grow rapidly. Smart glasses are attracting particular attention because they offer convenient features such as hands-free augmented reality (AR). Since smart glasses directly touch the face and head, the device with high temperature has a detrimental effect on human physical health. This paper presents a thermal network model in a steady state condition and thermal countermeasure methods for thermal management of future smart glasses. It is accomplished by disassembling the state by wearing smart glasses into some parts, creating the equivalent thermal resistance circuit for each part, approximating heat-generating components such as integrated circuits (ICs) to simple physical structures, setting power consumption to the heat sources, and providing heat transfer coefficients of natural convection in air. The average temperature difference between the thermal network model and a commercial thermal solver is 0.9 °C when the maximum temperature is 62 °C. Results of an experiment using the model show that the temperature of the part near the ear that directly touches the skin can be reduced by 51.4% by distributing heat sources into both sides, 11.1% by placing higher heat-generating components farther from the ear, and 65.3% in comparison with all high conductivity materials by using a combination of low thermal conductivity materials for temples and temple tips and high conductivity materials for rims.

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Section: Introductionmentioning

confidence: 99%