Patents by Inventor Akira Hamajima
Akira Hamajima has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
-
Patent number: 7974501Abstract: An optical modulator 24 has a supporting substrate 5, a modulating substrate 11 made of an electro-optical material, an optical waveguide 12 provided on the side of a first main surface 30 of the modulating substrate 11, and an adhesion layer 6 adhering a second main surface 31 of the modulating substrate 11 onto the supporting substrate 5. The modulating substrate 11 has a high-frequency interaction portion 11c applying a voltage on the optical waveguide 12 to modulate propagating light, an incident portion 11a inputting light to the optical waveguide, and an outgoing portion 11b outputting light from the optical waveguide. The high-frequency interaction portion 11c is recessed on the first main surface 30 of the modulating substrate 11 with respect to the incident and outgoing portions 11a and 11b. The high-frequency interaction portion 11c has a thickness smaller than the those of the incident and outgoing portions 11a and 11b.Type: GrantFiled: March 20, 2009Date of Patent: July 5, 2011Assignee: NGK Insulators, Ltd.Inventors: Akira Hamajima, Jungo Kondo, Osamu Mitomi, Tetsuya Ejiri, Kenji Aoki
-
Patent number: 7854049Abstract: In a piezoelectric thin film device of the present invention, the degree of flexibility is enhanced in selection of a piezoelectric material constituting a piezoelectric thin film and the crystal orientation in the piezoelectric thin film. A piezoelectric thin film filter, including four film bulk acoustic resonators, has a configuration where a filter section for providing a filter function of the piezoelectric thin film filter is bonded with a flat base substrate mechanically supporting the filter section via an adhesive layer. In manufacturing of the piezoelectric thin film filter, a piezoelectric thin film is obtained by performing removal processing on a piezoelectric substrate, but the piezoelectric thin film obtained by removal processing cannot independently stand up under its own weight. For this reason, a prescribed member including the piezoelectric substrate is previously bonded to the base substrate as a support prior to the removal processing.Type: GrantFiled: February 16, 2007Date of Patent: December 21, 2010Assignees: NGK Insulators, Ltd., NGK Optoceramics Co., Ltd.Inventors: Takashi Yoshino, Shoichiro Yamaguchi, Yuichi Iwata, Akira Hamajima, Kengo Suzuki
-
Publication number: 20090245715Abstract: An optical modulator 24 has a supporting substrate 5, a modulating substrate 11 made of an electro-optical material, an optical waveguide 12 provided on the side of a first main surface 30 of the modulating substrate 11, and an adhesion layer 6 adhering a second main surface 31 of the modulating substrate 11 onto the supporting substrate 5. The modulating substrate 11 has a high-frequency interaction portion 11c applying a voltage on the optical waveguide 12 to modulate propagating light, an incident portion 11a inputting light to the optical waveguide, and an outgoing portion 11b outputting light from the optical waveguide. The high-frequency interaction portion 11c is recessed on the first main surface 30 of the modulating substrate 11 with respect to the incident and outgoing portions 11a and 11b. The high-frequency interaction portion 11c has a thickness smaller than the those of the incident and outgoing portions 11a and 11b.Type: ApplicationFiled: March 20, 2009Publication date: October 1, 2009Applicant: NGK Insulators, Ltd.Inventors: Akira Hamajima, Jungo Kondo, Osamu Mitomi, Tetsuya Ejiri, Kenji Aoki
-
Publication number: 20080067888Abstract: The brush device is provided with a brush, a brush holder, and a biasing member. The brush holder has an insertion hole in which the brush is inserted. The biasing member biases the brush toward the sliding surface. The sliding surface is approximately perpendicular to the rotational axis of the commutator. The brush is inclined such that an end of the brush on a side of the commutator is positioned on a forward side of the other end of the brush with respect to a rotational direction of the commutator. A surface of the brush on the side of the commutator is approximately parallel with the sliding surface.Type: ApplicationFiled: September 7, 2007Publication date: March 20, 2008Applicant: AISAN KOGYO KABUSHIKI KAISHAInventors: Seiji II, Akira HAMAJIMA
-
Publication number: 20080047928Abstract: A first main face 1a of a substrate 1 of a dielectric single crystal is etched to form recesses 4 in the substrate 1. A second main face 1b of the substrate 1 is mechanically processed to form a slab 10, so that the recesses 4 pass through the substrate 1 to form through holes 11.Type: ApplicationFiled: August 21, 2007Publication date: February 28, 2008Applicant: NGK Insulators, Ltd.Inventors: Yuichi IWATA, Osamu Mitomi, Jungo Kondo, Kenji Aoki, Takashi Yoshino, Akira Hamajima
-
Publication number: 20070200459Abstract: The present invention is directed to preventing characteristic variations and damage caused by a difference in thermal expansion coefficient. A piezoelectric thin film filter, including four film bulk acoustic resonators, has a configuration where a filter section for providing a filter function of the piezoelectric thin film filter is bonded with a flat base substrate mechanically supporting the filter section via an adhesive layer. In manufacturing of the piezoelectric thin film filter, a piezoelectric thin film is obtained by performing removal processing on a piezoelectric substrate that can individually stand up under its own weight, but substrates made of one kind of single crystal material are adopted as the base substrate and the piezoelectric substrate, to make the respective thermal expansion coefficients of the piezoelectric thin film and the base substrate coincident with each other.Type: ApplicationFiled: February 16, 2007Publication date: August 30, 2007Applicants: NGK Insulators, Ltd., NGK Optoceramics Co., Ltd.Inventors: Takashi Yoshino, Shoichiro Yamaguchi, Yuichi Iwata, Akira Hamajima, Kengo Suzuki
-
Publication number: 20070199186Abstract: In a piezoelectric thin film device of the present invention, the degree of flexibility is enhanced in selection of a piezoelectric material constituting a piezoelectric thin film and the crystal orientation in the piezoelectric thin film. A piezoelectric thin film filter, including four film bulk acoustic resonators, has a configuration where a filter section for providing a filter function of the piezoelectric thin film filter is bonded with a flat base substrate mechanically supporting the filter section via an adhesive layer. In manufacturing of the piezoelectric thin film filter, a piezoelectric thin film is obtained by performing removal processing on a piezoelectric substrate, but the piezoelectric thin film obtained by removal processing cannot independently stand up under its own weight. For this reason, a prescribed member including the piezoelectric substrate is previously bonded to the base substrate as a support prior to the removal processing.Type: ApplicationFiled: February 16, 2007Publication date: August 30, 2007Applicants: NGK Insulators, Ltd., NGK Optoceramics Co., Ltd.Inventors: Takashi Yoshino, Shoichiro Yamaguchi, Yuichi Iwata, Akira Hamajima, Kengo Suzuki
-
Publication number: 20070200458Abstract: The present invention is directed to improving characteristics of a piezoelectric thin film device. A piezoelectric thin film filter including four film bulk acoustic resonators has a configuration where a filter section and a base substrate are bonded to each other via an adhesive layer, the filter section including a piezoelectric thin film which cannot stand up individually under its own weight, the flat base substrate mechanically supporting the filter section. As a piezoelectric material constructing the piezoelectric thin film, it is desirable to use a single-crystal material including no grain boundary, selected from crystal, lithium niobate, lithium tantalite, lithium tetraborate, zinc oxide, potassium niobate, and langasite.Type: ApplicationFiled: February 16, 2007Publication date: August 30, 2007Applicants: NGK Insulators, Ltd., NGK Optoceramics Co., Ltd.Inventors: Takashi Yoshino, Shoichiro Yamaguchi, Yuichi Iwata, Akira Hamajima, Kengo Suzuki
-
Patent number: 6290588Abstract: A jig for producing optical parts comprises a base stand for stacking ten individuals of fiber coil reels around which optical fibers are wound in a predetermined number of turns respectively, and array-holding mechanisms provided on a circumferential surface of the base stand, for downwardly exposing respective end surfaces of arrays secured to ends of the plurality of optical fibers led from the respective stacked fiber coil reels. Accordingly, it is possible to highly accurately polish the end surfaces of the array members secured to the ends of the optical fibers led from the plurality of reels respectively. It is possible to eliminate almost all dispersion in polishing accuracy among the array members, and it is possible to produce the optical parts highly accurately with a good yield.Type: GrantFiled: February 2, 1999Date of Patent: September 18, 2001Assignee: NGK Insulators, Ltd.Inventors: Shuhei Toyoda, Akira Hamajima
-
Patent number: 6160947Abstract: An optical transmission member-fixed assembly including a substrate with a receipt groove in which a core wire of an optical transmission member is received, a lid integrated with the substrate, while between the substrate and the lid is provided a receipt space in which at least a covering of the optical transmission member is received, a dimension of the receipt space being greater than that of the receipt groove when viewed in a width direction, wherein an adhesive is filled around the core wire inside the receipt groove for fixing the core wire there, an adhesive is filled around the optical transmission member within the receipt space for fixing the optical transmission member there, a thickness of the adhesive filled around the optical transmission member inside a boundary space zone between the receipt space and the receipt groove is continuously reduced as a location of the boundary space zone is at least near and goes to an opening of the receipt groove at an end opposed to the receipt space.Type: GrantFiled: March 20, 1998Date of Patent: December 12, 2000Assignee: NCK Insulators, Ltd.Inventors: Yukihisa Osugi, Akira Hamajima, Shuhei Toyoda, Yoshinari Kozuka, Yoshizumi Nakasuji
-
Method of manufacturing assembly of optical waveguide substrate and optical fiber aligning substrate
Patent number: 5197109Abstract: In a method of forming an assembly of an optical waveguide substrate and an optical fiber aligning substrate by adjoining an end face of a main body of the optical waveguide substrate and an end face of a main body of the optical fiber aligning substrate, a starting block formed by a flat rectangular plate is divided along a dividing surface which intersects perpendicularly to a side wall as well as a bottom wall of the starting block which are selected as a reference surface to obtain the main bodies of the optical waveguide substrate and optical fiber aligning substrate, optical waveguides are formed on the main body of the optical waveguide substrate by using the side wall and bottom wall as a positional reference, V-shaped guide grooves are formed in the main body of the optical fiber aligning substrate by using the side wall and bottom wall as a positional reference, and optical fibers are inserted into the guide grooves.Type: GrantFiled: April 9, 1992Date of Patent: March 23, 1993Assignee: NGK Insulators, Ltd.Inventors: Takenori Ichigi, Akira Hamajima, Tetsuhisa Abe, Atsuo Kondo