Abstract: The energy harvesting device includes a power management circuit to charge a storage with power from a generator including generation units to generate AC power when vibrated. The power management circuit includes: a first power extraction circuit including a rectification circuit converting AC power at a first input unit into DC power; a second power extraction circuit including a switching circuit operating with power from the storage and generating DC power using AC power at a second input unit; and a switch circuit having a first connection mode of connecting the first input unit to the generation units to receive an AC voltage greater in effective value than an AC voltage to the second input unit, and a second connection mode of connecting the second input unit to the generation units to receive an AC voltage greater in effective value than an AC voltage to the first input unit.

Abstract: A vibration power generating element comprises: a substrate provided with a supporting part and a cantilever that is swingably supported by the supporting part; and a power generation part formed at the cantilever and generating AC power in response to swing of the cantilever. The power generation part is provided with first and second piezoelectric converters apposed at a region that overlaps the cantilever at one surface side of the substrate. The vibration power generating element is further provided with a common electrode and individual electrodes. The common electrode is electrically connected to a lower electrode shared by the first and second piezoelectric converters. The individual electrodes are individually connected to upper electrodes of the first and second piezoelectric converters, respectively.

Abstract: A seed layer having a predetermined pattern is formed on a side of one surface of a second substrate, and a ferroelectric layer is formed on the side of the one surface of the second substrate. A lower electrode is formed on the ferroelectric layer, and the lower electrode and a first substrate are bonded via a bonding layer. A laser beam with a predetermined wavelength is irradiated from a side of other surface of the second substrate to transfer a ferroelectric film, which overlaps with the seed layer, of the ferroelectric layer and the seed layer onto the side of said one surface of the first substrate. The laser beam passes through the second substrate, is reflected by the seed layer, and is absorbed by a second portion of the ferroelectric layer. The second portion does not overlap with the seed layer.

Abstract: A vibration power generation element includes a base substrate having a support portion and a cantilever portion, and a power generation unit for generating alternating current power in response to vibration of the cantilever portion. The power generation unit includes: a lower electrode formed on one surface side of the base substrate so as to overlap the cantilever portion; a first piezoelectric layer formed on an opposite side of the lower electrode from the cantilever portion; an intermediate electrode formed on an opposite side of the first piezoelectric layer from the lower electrode; a second piezoelectric layer formed on an opposite side of the intermediate electrode from the first piezoelectric layer; and an upper electrode formed on an opposite side of the second piezoelectric layer from the intermediate electrode.

Abstract: The power generating device has a power generating section including a piezoelectric body; and a plurality of electrode pairs each constituted by a pair of electrodes placed on opposite sides of the piezoelectric body with regard to a thickness direction thereof to define a functional section therebetween, each of the functional sections is cooperated with the related electrode pair to define a power generating element. A plurality of the power generating elements includes a first and second power generating elements that give a polarization orientation opposite to each other in the thickness direction. The first and second power generating elements have the corresponding electrodes that are connected to each other by means of a wiring member on the same surface of the piezoelectric body with regard to the thickness direction thereof, such that all of the plurality of the power generating elements are connected in series.

Abstract: A vibration power generation device comprising: a frame section; a weight section, a flexure section; and a power generation section. The weight section is provided inside the frame section. The flexure section is joined between the frame section and the weight section, and is configured to bend in response to a vibration of the weight section. The power generation section is composed of a laminate on one surface of the flexure section. The laminate has a lower electrode, a piezoelectric layer and an upper electrode which are laminated in this order from the abovementioned one surface. The power generation section is configured to generate an alternating-current voltage in response to an oscillation of the weight section. A resonance frequency adjustment means is provided between the frame section and the weight section.

Abstract: A ferroelectric device comprises: a silicon substrate (a first substrate); a lower electrode (a first electrode) formed on one surface side of first substrate; a ferroelectric film formed on a surface of lower electrode opposite to first substrate side; and an upper electrode (a second electrode) formed on a surface of ferroelectric film opposite to lower electrode side. The ferroelectric film is formed of a ferroelectric material with a lattice constant difference from silicon. The ferroelectric device further comprises a shock absorbing layer formed of a material with better lattice matching with ferroelectric film than silicon and provided directly below the lower electrode. The first substrate is provided with a cavity that exposes a surface of shock absorbing layer opposite to lower electrode side.

Abstract: A seed layer having a predetermined pattern is formed on a side of one surface of a second substrate, and a ferroelectric layer is formed on the side of the one surface of the second substrate. A lower electrode is formed on the ferroelectric layer, and the lower electrode and a first substrate are bonded via a bonding layer. A laser beam with a predetermined wavelength is irradiated from a side of other surface of the second substrate to transfer a ferroelectric film, which overlaps with the seed layer, of the ferroelectric layer and the seed layer onto the side of said one surface of the first substrate. The laser beam passes through the second substrate, is reflected by the seed layer, and is absorbed by a second portion of the ferroelectric layer. The second portion does not overlap with the seed layer.

Abstract: Disclosed is a vibration power generation device which is provided with: a frame section; a weight section provided inside the frame section; a flexure section that is joined between the frame section and the weight section and is configured to bend in response to a displacement of the weight section; and a power generation section that is located at least at the flexure section and configured to generate an alternating-current voltage in response to a vibration of the weight section. The frame section and the weight section are formed of a silicon substrate. The power generation section comprises, at its own surface, an elastic film formed of a resin material. The flexure section comprises the elastic film formed of the resin material having a Young's modulus smaller than that of silicon forming the frame section and the weight section.

Abstract: A bandpass filter includes a combination of a BAW filter and a patterned planar filter with stubs. The BAW filter is composed of a plurality of piezoelectric resonators to give a specific frequency bandpass, while the planer filter is configured to attenuate frequencies near and outside the bandpass. The resonators are connected in a ladder configuration between a first signal transmission path and a ground. The planar filter includes a strip line formed on a dielectric layer to define a second signal transmission path. The BAW filter and the planar filter are formed on a common substrate with the first and second transmission paths connected to each other. The BAW filter, in combination with the patterned planar filter added with the stub, can improve a deep near-band rejection inherent to the BAW filter, exhibiting an excellent out-of-band rejection over certain adjacent frequency ranges outside of the bandpass, and therefore give a sharp and wide bandpass.

Abstract: A bandpass filter includes a combination of a BAW filter and a patterned planar filter with stubs. The BAW filter is composed of a plurality of piezoelectric resonators to give a specific frequency bandpass, while the planer filter is configured to attenuate frequencies near and outside the bandpass. The resonators are connected in a ladder configuration between a first signal transmission path and a ground. The planar filter includes a strip line formed on a dielectric layer to define a second signal transmission path. The BAW filter and the planar filter are formed on a common substrate with the first and second transmission paths connected to each other. The BAW filter, in combination with the patterned planar filter added with the stub, can improve a deep near-band rejection inherent to the BAW filter, exhibiting an excellent out-of-band rejection over certain adjacent frequency ranges outside of the bandpass, and therefore give a sharp and wide bandpass.