Denso Corporation

Denso Corpora Tion

Hidekazu Hattori

Yasuhiro Mizutani

Masayuki Kobayashi

Kenichiro Takada

Naoyuki Kawazoe

Tooru Matsumoto

Kazutaka Suzuki

Katsuyoshi Nishii

Tomoyuki Kanda

Yoichi Kobane

Satoru Kadowaki

Kazuhide Sato

Hiroaki Asano

Toshiaki Kamiya

Takashi Yamamoto

Shoichiro Emmei

Fuminori Nakashima

Syouichi Takenouchi

Shinya Mitarai

Osamu Inoue

Ikuo Ito

Shinichi Sugihara

A fuel cell stack includes a fuel cell, a first gas flow path, a second gas flow path, a pressing member, and a cell supporting member. The first gas flow path is provided on a first cell surface side of the fuel cell. The second gas flow path is provided on a second cell surface side of the fuel cell. The pressing member is disposed in the first gas flow path, and presses the first cell surface of the fuel cell. The cell supporting member is disposed in the second gas flow path, and supports the second cell surface of the fuel cell that is pressed by the pressing member.

Fuel cell stack

A high reliability ceramic laminate suppresses delamination and cracks. Wide ceramic sheets are temporarily laminated by heat and pressure to form a pre-laminate which is cut to form a unit body. Unit bodies are laminated to obtain a ceramic laminate. Dewaxing removes not less than 90% of a binder resin before the ceramic laminate is sintered.

Method of producing a ceramic laminate

A laminated-type piezoelectric elementis provided, which comprises a first external electrode layer, which is located at a side area of the laminated-type piezoelectric element, is electrically continuous to internal electrode layers, and comprises plural expansible and contractible opening portionsin a stacking direction of the laminated-type piezoelectric element. As the first external electrode layeris connected to the laminated-type piezoelectric elementwith an electrically conductive adhesive memberand the electrically conductive adhesive memberis narrower than the first external electrode layer, the electrically conductive adhesive memberpenetrates into the opening portionsof the first external electrode layerto form connections in a shape of an anchor. Therefore, the first external electrode layeris firmly connected to the laminated-type piezoelectric element

Laminated-type piezoelectric element

A laminated piezoelectric element () comprises a laminated piezoelectric element () piezoelectric layers () composed of a ceramic capable of expanding and contracting upon application of a voltage, and internal electrode layers (and) that supply voltage to the piezoelectric layers, the internal electrode layers and piezoelectric layers being alternately provided, a first external electrode layer () provided on a side of the laminated piezoelectric element () and electrically connected with the internal electrode layers (and), and a second external electrode layer () provided on a side of the laminated piezoelectric element () and electrically connected with the internal electrode layers (and) via the first ecternal electrode layer wherein there are specific external electrode width relationships.

Laminated piezoelectric element

This invention provides a method of producing a ceramic laminate body capable of suppressing the occurrence of de-lamination and cracks, and providing high reliability. This method comprises a heat-bonding step of covering a full periphery of side surfaces of ceramic layerspositioned in an orthogonal direction to a laminating direction with a side surface jig while the ceramic layers are laminated, heating the ceramic layers and pressing the ceramic layers from both end faces positioned in the laminating direction by end face jigs to form a heat-bonded ceramic laminate body; and a side surface grinding step of grinding or cutting the full periphery of the side surfaces inclusive of damage portionsoccurring in the ceramic laminate body in the heat-bonding step.

Method of producing ceramic laminate body

A piezoelectric device for an injector is built into an injector and generates driving force of the injector. A relation d(0.1Ec)/d(1.2Ec)&#x2267;0.50 is established between an apparent piezoelectric constant d(1.2Ec) calculated from static elongation when an electric field of 1.2 Ec is applied to the piezoelectric device in the same direction as a polarizing direction while a preset load of 500 N is applied to the piezoelectric device, and an apparent piezoelectric constant d(0.1Ec) calculated from static elongation when an electric field of 0.1 Ec is applied to the piezoelectric device in the same direction as the polarizing direction. The piezoelectric device so fabricated has high durability and can be used for a long time.

Piezoelectric device for injector

A piezoelectric device for an injector is built into an injector and generates driving force of the injector. A relation d(0.1Ec)/d(1.2Ec)&#x2267;0.50 is established between an apparent piezoelectric constant d(1.2Ec) calculated from static elongation when an electric field of 1.2Ec is applied to the piezoelectric device in the same direction as a polarizing direction while a preset load of 500 N is applied to the piezoelectric device, and an apparent piezoelectric constant d(0.1Ec) calculated from static elongation when an electric field of 0.1 Ec is applied to the piezoelectric device in the same direction as the polarizing direction. The piezoelectric device so fabricated has high durability and can be used for a long time.

A piezoelectric device for an injector, built into an injector and generating driving force of the injector, wherein a relation d(0.1 Ec)/d(1.2 Ec)&gE;0.50 is established between an apparent piezoelectric constant d(1.2 Ec) calculated from static elongation when an electric field of 1.2 Ec is applied to the piezoelectric device in the same direction as a polarizing direction while a preset load of 500 N is applied to the piezoelectric device, and an apparent piezoelectric constant d(0.1 Ec) calculated from static elongation when an electric field of 0.1 Ec is applied to the piezoelectric device in the same direction as the polarizing direction. The piezoelectric device so fabricated has high durability and can be used for a long time. The piezoelectric device is fabricated by alternately laminating a plurality of piezoelectric layers expanding and contracting in proportion to an applied voltage and a plurality of internal electrode layers for supplying the applied voltage, and the sectional shape of the piezoelectric device crossing at right angles the laminating direction is partially or wholly arcuate. The piezoelectric device is accommodated in a cylindrical accommodation space.

Hologram and process for producing hologram

A hologram of an increased size using a single color laser, capable of executing a full color regeneration in a desired view angle and a method for producing the hologram. A plurality of photo-sensitive members are independently exposed to obtain respective holograms, which are connected by using an adhesive layer,constructing a connecting means, in order to obtain an integrated hologram expanded in two-dimensional direction. The holograms are obtained by an interference of a reference light,and an object light passed through a light diffusing body,in order to cause the light diffusing body,to be recorded on the photo-sensitive member. The size of the light diffusing body,is such that the spectral characteristic of the diffused light from the hologram can attain a desired efficiency at least over the entire wavelength range of the visible light.

Hologram device and method for producing the same

A hologram has a hologram element,containing a photopolymer and a cover film,and cover plate,which cover its surfaces. An adhesive,is used for bonding the cover film to the hologram element and the cover plate to the hologram element. The hologram has excellent humidity resistance, chemical resistance, solvent resistance and heat resistance, prevents coloration, can maintain its holographic properties and allows easy repositioning of the hologram element.

Hologram

A hologram display has a projector (,), a hologram screen (,), and a filter set (,) that is arranged between the projector and the hologram screen to absorb light with a peak diffraction efficiency in a specific wavelength area. The hologram display faithfully reproduces original colors and improves productivity. Also provided is a hologram screen having a hologram element (,) for diffracting and scattering a projected beam (,) from a projector (,), and a light scattering element (,) whose scattering angle is at least five degrees. The hologram screen correctly reproduces original colors.

Hologram display

There is provided a hologram with excellent heat resistance. The hologram comprises a hologram film (10) in which a diffraction grating has been recorded, a substrate (11) situated on one side of the hologram film (10) via a bonding material (13), and a polymer film (12) situated on the other side of the hologram film (10) via a bonding material (13), wherein the thickness of the polymer film (12) is no greater than 100 .mu.m. Otherwise, the polymer film (12) is subjected to prior heat treatment. There is further provided a production process for holograms with minimal appearance defects. The process comprises preparing a photopolymer (210) coated onto a substrate (211) and affixing the photopolymer surface (301) onto a photographed object original (213), exposing it to laser light to converting it into a hologram (201), then releasing the hologram (201) from the photographed object original (213) to expose the hologram surface (302) and finally affixing a protective film (215) onto the hologram surface (302), such that the bonding strength A between the substrate (211) and the hologram (201) is greater than the bonding strength B between the hologram (201) and the protective film (215).

A hologram of an increased size using a single color laser, capable of executing a full color regeneration in a desired view angle and a method for producing the hologram. A plurality of photo-sensitive members are independently exposed to obtain respective holograms, which are connected by using an adhesive layer 80 constructing a connecting means, in order to obtain an integrated hologram expanded in two-dimensional direction. The holograms are obtained by an interference of a reference light 22 and an object light passed through a light diffusing body 24 in order to cause the light diffusing body 24 to be recorded on the photo-sensitive member. The size of the light diffusing body 24 is such that the spectral characteristic of the diffused light from the hologram can attain a desired efficiency at least over the entire wavelength range of the visible light.

A hologram has a hologram element 3 containing a photopolymer and a cover film 22 and cover plate 21 which cover its surfaces. An adhesive 1 is used for bonding the cover film to the hologram element and the cover plate to the hologram element. The hologram has excellent humidity resistance, chemical resistance, solvent resistance and heat resistance, prevents coloration, can maintain its holographic properties and allows easy repositioning of the hologram element.

Growing community of inventors

Nagoya, Japan

Hidekazu Hattori