Nitto-denko Corporation

Takehiro Ui

Hiroichi Ukei

Hironobu Machinaga

Kazuto Yamagata

Kazuhiko Kinpara

Shinji Muto

Mitsuo Matsumoto

Yuuki Takeda

Manabu Matsunaga

Kazuhiro Fuke

Kazuaki Sasa

Yuya Kitagawa

Shinpei Nishikawa

Yuya Matsuzaki

Eri Ueda

Takashi Koizumi

Yoshiaki Mitsuoka

Masatsugu Koso

Youhei Hayashi

Yuki Takeda

Ryosuke Aoki

Masataka Usui

Kyohei Akiyama

An electromagnetic shield includes a plate-shaped base. The base has a first surface and a second surface. The second surface is distant from the first surface and extends along the first surface. The first surface includes a plurality of first recessed portions and a first solid portion. The first solid portion includes a surface in contact with an edge of the first recessed portion in the particular direction, the surface being a basis of a depth of the first recessed portion. The first solid portion has a dimension in a depth direction of the first recessed portion. The second surface includes a plurality of second recessed portions arranged alternately with the plurality of first recessed portions in the particular direction.

Electromagnetic shield

An electromagnetic wave absorber () includes a dielectric layer (), a resistive layer (), and an electrically conductive layer (). The resistive layer () is disposed on one principal surface of the dielectric layer (). The electrically conductive layer () is disposed on the other principal surface of the dielectric layer () and has a sheet resistance lower than a sheet resistance of the resistive layer (). The resistive layer () has a sheet resistance of 200 to 600&#x3a9;/&#x25a1;. When the resistive layer () is subjected to an immersion treatment in which the resistive layer () is immersed in a 5 weight % aqueous solution of NaOH for 5 minutes, an absolute value of a difference between a sheet resistance of the resistive layer () before the immersion treatment and a sheet resistance of the resistive layer () after the immersion treatment is less than 100&#x3a9;/&#x25a1;.

Electromagnetic wave absorber and electromagnetic wave absorber-attached molded article

An electromagnetic wave absorber () includes a dielectric layer (), a resistive layer (), and an electrically conductive layer (). The resistive layer () is disposed on one principal surface of the dielectric layer (). The electrically conductive layer () is disposed on the other principal surface of the dielectric layer () and has a sheet resistance lower than a sheet resistance of the resistive layer (). The resistive layer () is a layer that includes tin oxide or titanium oxide as a main component or a layer that is made of indium tin oxide including 40 weight % or more of tin oxide.

An electromagnetic wave absorber includes an electromagnetic wave-absorbing layer () and an adhesive layer (). The adhesive layer () is disposed on at least one surface of the electromagnetic wave-absorbing layer (). The electromagnetic wave absorber is capable of being adhered to a surface having a step in such a manner that the adhesive layer () is in contact with the surface. The adhesive layer () has a thickness equal to or greater than a reference height determined by subtracting 0.1 mm from the height of the step. In the electromagnetic wave absorber, a return loss &#x394;R defined by &#x394;R=Rt&#x2212;Rr is 15 dB or more. Rt is a reflection amount of a 76-GHz electromagnetic wave and is measured for a reference specimen. Rr is a reflection amount of a 76-GHz electromagnetic wave and is measured for a specimen obtained by adhering the electromagnetic wave absorber.

Electromagnetic wave absorber

A radio wave absorbing memberincludes a radio wave absorberand a supporthaving a sheet shape. The radio wave absorberincludes a resistive layer, a reflective layer, and a dielectric layer. The reflective layerreflects a radio wave. The dielectric layeris disposed between the resistive layerand the reflective layerin the thickness direction of the reflective layer. The supportsupports the radio wave absorber. The supportincludes a matrix resinand a flame retardant

Radio wave absorbing member, radio wave absorbing structure, and inspection apparatus

An electromagnetic wave absorber (a) includes a first layer () and an electrically conductive layer (). The first layer () is a dielectric layer or a magnetic layer. The electrically conductive layer () is provided on at least one surface of the first layer. A product of a Young's modulus of the first layer () and a thickness of the first layer () is 0.1 to 1000 MPa&#xb7;mm. The first layer () has a relative permittivity of 1 to 10.

Electromagnetic wave absorber and molded article with electromagnetic wave absorber

An electromagnetic wave absorber () includes a resistive layer (), an electrically conductive layer () and a dielectric layer (). The electrically conductive layer () has a sheet resistance lower than a sheet resistance of the resistive layer (). The dielectric layer () is disposed between the resistive layer () and the electrically conductive layer (). The electromagnetic wave absorber () has a first slit (). The first slit () extends, in the resistive layer (), from a first principal surface () distal to the dielectric layer () toward the dielectric layer () in a direction perpendicular to the first principal surface () and divides the resistive layer () into a plurality of first blocks (). Each of the first blocks () has a minimum dimension (D) of 2 mm or more at the first principal surface ().

Electromagnetic wave absorber, article with electromagnetic wave absorber, and method for manufacturing electromagnetic wave absorber

For the purpose of providing an electromagnetic wave absorber usable for radar having a high revolution and sufficiently adaptable to a plurality of radars different in frequency, the bandwidth of a frequency band in which an electromagnetic wave absorption amount is not less than 20 dB is not less than 2 GHz, within a frequency band of 60 to 90 GHz.

A lamp reflector () includes a mirror surface () and a laminate (). The mirror surface () is a surface for reflecting light from a light source () to guide the light in a predetermined direction. The laminate () covers at least a part of the mirror surface () to absorb an electromagnetic wave having a specific frequency of 20 GHz to 90 GHz. The laminate () allows the light from the light source () to transmit therethrough toward the mirror surface ().

Lamp reflector and laminate for reflector

For the purpose of providing an electromagnetic wave absorber capable of holding excellent performance over a long period of time, the electromagnetic wave absorber includes: a dielectric layer B including a polymer film and having a first surface and a second surface; a resistive layer A formed on the first surface of the dielectric layer Band containing indium tin oxide as a main component; and an electrically conductive layer C formed on the second surface of the dielectric layer B and having a sheet resistance lower than that of the resistive layer A, wherein the indium tin oxide in the resistive layer A contains 20 to 40 wt. % of tin oxide based on the total weight of the indium tin oxide.

Electromagnetic wave absorber and molded article equipped with electromagnetic wave absorber

An electromagnetic wave absorber () includes: a first layer () being a dielectric layer or a magnetic layer; and a conductive layer () provided on at least one surface of the first layer (). The conductive layer () has a sheet resistance of 100&#x3a9;/&#x25a1; or less after the electromagnetic wave absorber () is exposed to an environment having a temperature of 85&#xb0; C. and a relative humidity of 85% for 1000 hours. The electromagnetic wave absorber () has a flexural rigidity of 7000 MPa&#xb7;mmor less.

A foaming composition for filling contains a polymer, an organic peroxide, and azodicarbonamide, and a viscosity thereof measured at a temperature of 120&#xb0; C. and under a pressure of 500 MPa with a flow tester is in a range of 1050 to 4950 Pa&#xb7;s.

Foaming composition for filling, foaming member for filling, and foam for filling

A foam filling member that can hold a foam sheet in a looped shape stably, without increasing the number of components, to provide improved vibration suppression and sound insulation. The strip-like foam sheet is formed in a looped shape by bending round it, so that both end portions of the foam sheet are overlapped with each other in a thickness direction thereof to form an overlapped portion therein. Then, insertion shafts of a clip are inserted through the overlapped portion, so that the overlapped portion is held in sandwich relation between a base portion and a head portion to form a foam filling member. Then, a supporting portion of the fixing portion of the clip is inserted in a fixing hole of an inner panel and fixed to the inner panel. After the inner panel and an outer panel are welded, the foam filling member is foamed, cross-linked, and cured by heating in a drying line process at the baking finish, to thereby produce the foam, whereby the interior space of the pillar is filled up with the foam, leaving no space therein.

Foam filling member

Filling foam composition capable of providing excellent rustproofing and also suppressing reduction of a foam ratio of the filling foam composition even when reusing unwanted parts thereof and inferior goods thereof; a foam filling member using the same filling foam composition; and a filling foam produced by foaming the filling foam composition. The filling foam composition is prepared by mixing foamable polymer, a foaming agent, and a basic oxide in such a mixing ratio that a ratio of the basic oxide can be in the range of 0.05-70 parts by weight per 100 parts by weight of foaming agent. The mounting member for the filling foam composition to be mounted in an internal space of a hollow member is produced by mounting a mounting member on the filling foam composition obtained. The filling foam is formed by fitting the foam filling member in the internal space of the hollow member and, then, foaming the filling foam composition by the application of heat.

Growing community of inventors

Osaka, Japan

Takehiro Ui