The University of Tokyo

Saginomiya Seisakusho, Inc.

Kddi Corporation

Hiroaki Honma

Hiroshi Toshiyoshi

Hiroyuki Mitsuya

Takeaki Yajima

Tomoki Sada

Yukiya Tohyama

An electrostatic device includes: a fixed portion, a moveable portion, and an elastically-supporting portion that are formed in a same substrate; and a first glass package and a second glass package that are anodically bonded to each other on one and the other of front and back surfaces of the substrate with the fixed portion and the elastically-supporting portion separated from each other, the second glass package forms a sealed space in which the moveable portion is arranged between the first and second glass packages, an electret is formed at least partially in the fixed portion and the moveable portion, and a first electrode connected to the fixed portion and exposed on an outer surface of the second glass package and a second electrode connected to the elastically-supporting portion and exposed on the outer surface of the second glass package are formed in the second glass package.

Electrostatic device, electrostatic device intermediate body and production method

An energy harvesting device having an energy converting element that converts environmental energy into electric energy, an environmental sensor that is disposed in an identical environment as the energy converting element, and a power supply circuit that receives electricity from the energy converting element and outputs the electricity to an external load. The power supply circuit is configured to change an operation condition of, for example, a voltage converting circuit of the power supply circuit, in accordance with an output of the environmental sensor.

Environmental energy harvesting device

A vibration-driven energy harvesting element includes: a pair of fixed electrode portions that have a plurality of fixed comb teeth and are arranged such that the plurality of fixed comb teeth face each other; and a movable electrode portion that is arranged between the pair of fixed electrode portions and has a pair of a plurality of movable comb teeth being inserted between the fixed comb teeth of the respective fixed electrode portions, wherein: the vibration-driven energy harvesting element has a three-terminal structure in which the fixed comb teeth and/or the movable comb teeth are electretized; a gap dimension of a clearance region between the fixed comb teeth and the movable comb teeth is smaller than 20 &#x3bc;m; and an aspect ratio being a ratio of a dimension of the clearance region in a comb tooth height direction to the gap dimension of the clearance region, is 20 or more.

Vibration-driven energy harvesting element

A wireless communication device includes a transmission unit that transmits a signal to a plurality of destinations after waiting for a common waiting time set for transmission to the plurality of destinations, a counter that updates a counter value on the basis of acknowledgement information from each destination for the signal transmitted by the transmission unit, and an update determination unit that determines a settable range of the common waiting time which is to be set for transmission to a plurality of scheduled transmission destinations according to the counter value. The transmission unit determines the common waiting time for transmission to the plurality of scheduled transmission destinations on the basis of the settable range determined by the update determination unit.

Growing community of inventors

Tokyo, Japan

Hiroaki Honma