Patents by Inventor Mitsuaki Horimoto

Mitsuaki Horimoto 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).

  • Publication number: 20230303388
    Abstract: A MEMS microphone includes a diaphragm having conductivity, first and second variable capacitors respectively including first and second fixed electrodes, a first voltage output section that outputs a first voltage changed according to a change in a capacitance of the first variable capacitor, and a second voltage output section that outputs a second voltage changed according to a change in a capacitance of the second variable capacitor. The first and second fixed electrodes face the diaphragm. The capacitances of the first and second variable capacitors are changed in accordance with a vibration of the diaphragm. A first bias voltage is applied to the first fixed electrode. A reference voltage is applied to the second fixed electrode. A second bias voltage is applied to the diaphragm. A difference between the second bias voltage and the reference voltage is half of a difference between the first bias voltage and the reference voltage.
    Type: Application
    Filed: March 22, 2023
    Publication date: September 28, 2023
    Applicant: MMI SEMICONDUCTOR CO., LTD.
    Inventors: Kazuki ITOYAMA, Hajime KANO, Yuki UCHIDA, Takuma YOSHIDA, Mitsuaki DAIO, Yasuhiro HORIMOTO
  • Patent number: 4465343
    Abstract: The present invention is directed to a three-group type wide angle zoom lens system which comprises, from the object to the image side, a first lens group of a negative refractive power movable along the optical axis for zooming, the first lens group including at least two positive lens elements and at least one negative lens element, a second lens group of a positive refractive power movable separately from the first lens group along the optical axis for zooming, the second lens group being of the triplet type formed by sandwitching a negative refractive power component in between a pair of positive refractive power components, and a third lens group of a positive refractive power movable separately from the first and second lens groups along the optical axis for zooming, the third lens group including at least one positive lens element, wherein the lens system fulfills the following condition:2.5<f.sub.III /f.sub.II <4.5wherein:f.sub.II and f.sub.
    Type: Grant
    Filed: April 15, 1981
    Date of Patent: August 14, 1984
    Assignee: Minolta Camera Kabushiki Kaisha
    Inventor: Mitsuaki Horimoto
  • Patent number: 4412726
    Abstract: An improved compact high-speed fish eye lens system with minimal saggital flare is provided. The lens system comprises a front lens group having a pair of negative meniscus lens elements convex to the object side, an intermediate lens group having a pair of positive lens elements and a negative lens element, a rear lens group having a pair of doublets, the object side one of which includes an intermediate cemented surface having a positive refractive power.
    Type: Grant
    Filed: January 13, 1981
    Date of Patent: November 1, 1983
    Assignee: Minolta Camera Kabushiki Kaisha
    Inventor: Mitsuaki Horimoto
  • Patent number: 4256373
    Abstract: An improved high speed fish eye lens system is provided capable of compensating for lateral chromatic aberration, field curvature and astigmatism while providing an aperture ratio of F/2.8. The fish eye lens system includes a first lens group of a negative refractive power having two negative meniscus single lenses convex to the object side. A second lens group of a positive refractive power includes a doublet, while a third lens group of a positive refractive power includes at least a positive meniscus single lens convex to the image side and a doublet.
    Type: Grant
    Filed: August 9, 1978
    Date of Patent: March 17, 1981
    Assignee: Minolta Camera Kabushiki Kaisha
    Inventor: Mitsuaki Horimoto
  • Patent number: 4147410
    Abstract: A wide angle zoom lens system for use with a 35 mm single lens reflex camera is provided. The zoom lens system is relatively compact and includes two lens groups that can be relatively displaced along the optical axis to provide variation in focal length as desired. The first lens group has a negative refractive power and the image side second lens group has a positive refractive power. The relationship of their refractive powers has been selected to provide adequate correction of aberrations while maintaining the size, weight and compactness required in a modern zoom lens system with wide angle capability.
    Type: Grant
    Filed: November 4, 1977
    Date of Patent: April 3, 1979
    Assignee: Minolta Camera Kabushiki Kaisha
    Inventors: Masaichi Shimomura, Mitsuaki Horimoto
  • Patent number: 4009943
    Abstract: An extremely wide angle or fish eye lens system is provided capable of compensating for lateral chromatic aberration, field curvature and astigmatism while providing an aperture ratio of F/4 for use with a compact single lens reflex camera. The fish eye lens system includes a first lens group of four lenses on the object side of a diaphragm and a second lens group of at least three lenses on the image side of the diaphragm. From the object to image side, the first lens group includes a pair of negative lenses, a cemented doublet and a positive fourth lens having a convex surface on the image side adjacent a concave surface of the cemented doublet. The second lens group includes a pair of cemented doublets as two of the three lenses.
    Type: Grant
    Filed: August 20, 1975
    Date of Patent: March 1, 1977
    Assignee: Minolta Camera Kabushiki Kaisha
    Inventor: Mitsuaki Horimoto
  • Patent number: 3972056
    Abstract: A varifocal lens assembly of a type including at least two lens groups, a first lens group being axially movable parallel to the optical axis of the varifocal lens assembly for varying the focal length of the optical system of the varifocal lens assembly. An automatic focusing device is associated with the varifocal lens assembly to axially move the lens groups as a whole, the other or second lens group or a part of lens elements of the other or second lens group a predetermined distance to compensate for the image shift which takes place during the adjustment of the focal length effected by axially moving the first lens group.
    Type: Grant
    Filed: December 4, 1974
    Date of Patent: July 27, 1976
    Assignee: Minolta Camera Kabushiki Kaisha
    Inventors: Kayoshi Tsujimoto, Tohru Matsui, Haruo Abe, Mitsuaki Horimoto