Patents by Inventor Masaru Eguchi

Masaru Eguchi 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: 20190185711
    Abstract: An epoxy resin composition which is suppressed in curing shrinkage upon being cured to obtain a cured film having low warpage and high adhesion. The epoxy resin composition contains epoxy resin (A), compound (B) represented by formula (1) and nanosilica filler (C). In formula (1), R1 and R2 are independently an alkyl group having 1 to 10 carbons or a phenyl group, and X is independently hydrogen or a monovalent organic group, and in one molecule of the compound, at least one of X includes an epoxy group.
    Type: Application
    Filed: August 26, 2016
    Publication date: June 20, 2019
    Applicants: JNC CORPORATION, JNC PETROCHEMICAL CORPORATION
    Inventors: Kazuya SUWA, Masaru EGUCHI, Hironori IKENO, Tomoyuki OBA
  • Patent number: 9097882
    Abstract: A zoom lens system includes a negative first lens group, a positive second lens group, and a positive third lens group, in that order from the object side, wherein upon zooming from the short focal length extremity to the long focal length extremity, the distance between the first lens group and the second lens group decreases, and the distance between the second lens group and the third lens group increases. The second lens group includes a positive first sub-lens group and a negative second sub-lens group, in that order from the object side. The second sub-lens group is a focusing lens group which is moved along the optical axis direction during a focusing operation. The following condition (1) is satisfied: ?1.5<F2/F2B<?0.7??(1), wherein F2 designates the focal length of the second lens group, and F2B designates the focal length of the second sub-lens group.
    Type: Grant
    Filed: November 29, 2011
    Date of Patent: August 4, 2015
    Assignee: HOYA CORPORATION
    Inventors: Tetsuya Abe, Masaru Eguchi
  • Patent number: 8830358
    Abstract: A high zoom-ratio zoom lens system includes a positive first lens group, a negative second lens group, a positive third lens group and a positive fourth lens group. Upon zooming, the distance between the first and second lens groups increases, the distance between the second and third lens groups decreases, and the distance between the third and fourth lens groups increases. The first lens group includes a negative lens element, and two positive lens elements. The absolute value of the radius-of-curvature of the image-side surface of the negative lens element within the first lens group is smaller than the absolute value of the radius-of-curvature of the object-side surface of the positive lens element on the object side within the first lens group. The following condition (1) is satisfied: 1.95<n11??(1), wherein n11 designates the refractive index at the d-line of the negative lens element within the first lens group.
    Type: Grant
    Filed: September 1, 2011
    Date of Patent: September 9, 2014
    Assignee: Hoya Corporation
    Inventor: Masaru Eguchi
  • Patent number: 8730586
    Abstract: A zoom lens system includes a negative first lens group, positive second and third lens groups, wherein upon zooming from the short to the long focal length extremities, the distance between the first and second lens groups decreases and the distance between the second and third lens groups changes. The second lens group includes a biconvex positive lens element with an aspherical surface on each side, and a negative meniscus lens element with an aspherical surface, and a concave surface on the image side. The following condition (1) is satisfied: 5<m2t/m2w<8??(1), wherein m2t and m2w designate the lateral magnifications of the second lens group at the long and short focal length extremities, respectively, when focused on an object at infinity.
    Type: Grant
    Filed: November 13, 2012
    Date of Patent: May 20, 2014
    Assignee: Hoya Corporation
    Inventor: Masaru Eguchi
  • Patent number: 8699146
    Abstract: A zoom lens system includes a positive first lens group, a negative second lens group, a positive third lens group and a positive fourth lens group, in that order from the object side. Upon zooming from the short to long focal length extremities, the distance between the first and second lens groups increases, the distance between the second and third lens groups decreases, and the distance between the third and fourth lens groups changes. The second lens group includes a negative lens element having a concave surface on the image side, a negative lens element having a concave surface on the image side, and a plastic positive lens element having an aspherical surface on at least one side and having a convex surface on the object side, in that order from the object side.
    Type: Grant
    Filed: March 30, 2012
    Date of Patent: April 15, 2014
    Assignee: Hoya Corporation
    Inventors: Masaru Eguchi, Koichiro Hayakawa
  • Patent number: 8675278
    Abstract: A high zoom-ratio zoom lens system includes a positive first lens group, a negative second lens group, a positive third lens group and a positive fourth lens group, in that order from the object side. Upon zooming from the short focal length extremity to the long focal length extremity, at least the first through third lens groups move along the optical axis direction in a manner so that the distance between the first lens group and the second lens group increases, the distance between the second lens group and the third lens group decreases, and the distance between the third lens group and the fourth lens group increases, wherein the amount of movement of the first lens group during zooming is larger than that of the third lens group.
    Type: Grant
    Filed: August 22, 2011
    Date of Patent: March 18, 2014
    Assignee: Hoya Corporation
    Inventor: Masaru Eguchi
  • Patent number: 8670184
    Abstract: A zoom lens system includes a negative first lens group, positive second and third lens groups, wherein upon zooming from the short to long focal length extremities, the distance between the first and second lens groups decreases and the distance between the second and third lens groups changes. The second lens group includes a biconvex positive lens element with an aspherical surface on each side, and a negative meniscus lens element with an aspherical surface, and a concave surface on the image side. Conditions (1) and (2) are satisfied: ?d>80??(1), and Pg—F>0.53??(2), wherein ?d designates the Abbe number at the d-line of the biconvex positive lens element within the second lens group, and Pg_F designates the partial dispersion ratio of the biconvex positive lens element within the second lens group.
    Type: Grant
    Filed: November 13, 2012
    Date of Patent: March 11, 2014
    Assignee: Hoya Corporation
    Inventor: Masaru Eguchi
  • Patent number: 8553328
    Abstract: A zoom lens system includes a negative first lens group, a positive second lens group, and a positive third lens group, in that order from the object side, wherein upon zooming from the short focal length extremity to the long focal length extremity, the distance between the first lens group and the second lens group decreases, and the distance between the second lens group and the third lens group increases. The second lens group includes a positive first sub-lens group and a negative second sub-lens group, in that order from the object side. The second sub-lens group is a negative single lens element serving as an image-stabilizer lens group which moves in directions orthogonal to the optical axis to change the imaging position to correct image shake.
    Type: Grant
    Filed: March 8, 2012
    Date of Patent: October 8, 2013
    Assignee: Hoya Corporation
    Inventors: Tetsuya Abe, Masaru Eguchi
  • Patent number: 8531768
    Abstract: A zoom lens system includes a negative first lens group, a positive second lens group, and a positive third lens group, in that order from the object side, wherein upon zooming from the short to long focal length extremities, the distance between the first lens group and the second lens group decreases, and the distance between the second lens group and the third lens group increases. The second lens group includes a positive first sub-lens group and a negative second sub-lens group, in that order from the object side. In at least part of the zooming range of the zoom lens system, the second sub-lens group and the third lens group each serves as a focusing lens group that is moved along the optical axis during a focusing operation.
    Type: Grant
    Filed: March 8, 2012
    Date of Patent: September 10, 2013
    Assignee: Hoya Corporation
    Inventors: Tetsuya Abe, Masaru Eguchi, Toshiki Nakamura
  • Publication number: 20120262800
    Abstract: A zoom lens system includes a positive first lens group, a negative second lens group, a positive third lens group and a positive fourth lens group, in that order from the object side. Upon zooming from the short to long focal length extremities, the distance between the first and second lens groups increases, the distance between the second and third lens groups decreases, and the distance between the third and fourth lens groups changes. The second lens group includes a negative lens element having a concave surface on the image side, a negative lens element having a concave surface on the image side, and a plastic positive lens element having an aspherical surface on at least one side and having a convex surface on the object side, in that order from the object side.
    Type: Application
    Filed: March 30, 2012
    Publication date: October 18, 2012
    Applicant: HOYA CORPORATION
    Inventors: Masaru EGUCHI, Koichiro HAYAKAWA
  • Publication number: 20120243107
    Abstract: A zoom lens system includes a negative first lens group, a positive second lens group, and a positive third lens group, in that order from the object side, wherein upon zooming from the short to long focal length extremities, the distance between the first lens group and the second lens group decreases, and the distance between the second lens group and the third lens group increases. The second lens group includes a positive first sub-lens group and a negative second sub-lens group, in that order from the object side. In at least part of the zooming range of the zoom lens system, the second sub-lens group and the third lens group each serves as a focusing lens group that is moved along the optical axis during a focusing operation.
    Type: Application
    Filed: March 8, 2012
    Publication date: September 27, 2012
    Applicant: HOYA CORPORATION
    Inventors: Tetsuya Abe, Masaru Eguchi, Toshiki Nakamura
  • Publication number: 20120229912
    Abstract: A zoom lens system includes a negative first lens group, a positive second lens group, and a positive third lens group, in that order from the object side, wherein upon zooming from the short focal length extremity to the long focal length extremity, the distance between the first lens group and the second lens group decreases, and the distance between the second lens group and the third lens group increases. The second lens group includes a positive first sub-lens group and a negative second sub-lens group, in that order from the object side. The second sub-lens group is a negative single lens element serving as an image-stabilizer lens group which moves in directions orthogonal to the optical axis to change the imaging position to correct image shake.
    Type: Application
    Filed: March 8, 2012
    Publication date: September 13, 2012
    Applicant: HOYA CORPORATION
    Inventors: Tetsuya ABE, Masaru EGUCHI
  • Patent number: 8264780
    Abstract: A high zoom-ratio zoom lens system includes a positive first lens group, a negative second lens group, a positive third lens group, and a positive fourth lens group, in that order from the object side. Upon zooming from the short to long focal length extremities, at least the first through third lens groups are moved along the optical axis direction, wherein an amount of movement of the first lens group is greater than that of the third lens group. The following conditions (1), (2) and (3) are satisfied: 0.9<FT/F1<2??(1), 3<F1/FW<7??(2), and ?8<F1/F2<?5??(3), wherein FT and FW designate the entire focal length of the zoom lens system at the long and short focal length extremities, respectively; and F1 and F2 designate the focal length of the first and second lens groups, respectively.
    Type: Grant
    Filed: March 2, 2011
    Date of Patent: September 11, 2012
    Assignee: Hoya Corporation
    Inventor: Masaru Eguchi
  • Patent number: 8248708
    Abstract: A zoom lens system includes a negative first lens group, a positive second lens group, and a positive third lens group, in this order from the object. Each of the negative first lens group, the positive second lens group and the positive third lens group moves along the optical axis upon zooming. The positive second lens group includes a positive first lens element, a negative second lens element, and a negative third lens element, in this order from the object. The zoom lens system satisfies the following conditions: 2<f2/rb<3??(1) 0.4<f2/f3<0.8??(2) wherein f2 designates the focal length of the positive second lens group; f3 designates the focal length of the positive third lens group; and rb designates the radius of curvature of the image-side surface of the negative third lens element of the positive second lens group.
    Type: Grant
    Filed: April 15, 2011
    Date of Patent: August 21, 2012
    Assignee: Hoya Corporation
    Inventors: Koichiro Hayakawa, Masaru Eguchi
  • Patent number: 8243371
    Abstract: A high zoom-ratio zoom lens system includes a positive first lens group, a negative second lens group, a positive third lens group, and a positive fourth lens group, in that order from the object side, wherein upon zooming from the short to the long focal length extremities, the first through fourth lens groups are moved along the optical axis direction, wherein an amount of movement of the first lens group is greater than that of the third lens group. The following conditions (1) and (2) are satisfied: 1.4<FT/F1<2.4??(1), and 5<M2T/M2W<10??(2), wherein FT designates the entire focal length at the long focal length extremity, F1 designates the focal length of the first lens group, and M2T and M2W designate the magnification of the second lens group with respect to an object at infinity at the long and short focal length extremities, respectively.
    Type: Grant
    Filed: March 2, 2011
    Date of Patent: August 14, 2012
    Assignee: Hoya Corporation
    Inventor: Masaru Eguchi
  • Publication number: 20120140327
    Abstract: A zoom lens system includes a negative first lens group, a positive second lens group, and a positive third lens group, in that order from the object side, wherein upon zooming from the short focal length extremity to the long focal length extremity, the distance between the first lens group and the second lens group decreases, and the distance between the second lens group and the third lens group increases. The second lens group includes a positive first sub-lens group and a negative second sub-lens group, in that order from the object side. The second sub-lens group is a focusing lens group which is moved along the optical axis direction during a focusing operation. The following condition (1) is satisfied: ?1.5<F2/F2B<?0.7??(1), wherein F2 designates the focal length of the second lens group, and F2B designates the focal length of the second sub-lens group.
    Type: Application
    Filed: November 29, 2011
    Publication date: June 7, 2012
    Applicant: HOYA CORPORATION
    Inventors: Tetsuya ABE, Masaru EGUCHI
  • Patent number: 8174774
    Abstract: A zoom lens system includes a positive first lens group, a negative second lens group, a positive third lens group, and a positive fourth lens group, in this order from the object. Upon zooming from the short focal length extremity to the long focal length extremity, all of the first through fourth lens groups move along the optical axis. The zoom lens system satisfies the following condition: 3<T1/F2<4 . . . (1) wherein T1 designates the traveling distance of the first lens group upon zooming from the short focal length extremity to the long focal length extremity; and F2 designates the focal length of the second lens group.
    Type: Grant
    Filed: June 25, 2010
    Date of Patent: May 8, 2012
    Assignee: Hoya Corporation
    Inventor: Masaru Eguchi
  • Patent number: 8169720
    Abstract: A rear focus wide-angle lens system includes a first lens group, a diaphragm, and a second lens group, in this order from the object. The second lens group is moved along the optical axis of the lens system when focusing is performed from infinity to an object at a closer distance. The rear focus wide-angle lens system satisfies the condition 1.5 <F1/F2<3.0, wherein F1 designates the focal length of the first lens group and F2 designates the focal length of the second lens group.
    Type: Grant
    Filed: October 30, 2009
    Date of Patent: May 1, 2012
    Assignee: Hoya Corporation
    Inventor: Masaru Eguchi
  • Publication number: 20120062770
    Abstract: A high zoom-ratio zoom lens system includes a positive first lens group, a negative second lens group, a positive third lens group and a positive fourth lens group. Upon zooming, the distance between the first and second lens groups increases, the distance between the second and third lens groups decreases, and the distance between the third and fourth lens groups increases. The first lens group includes a negative lens element, and two positive lens elements. The absolute value of the radius-of-curvature of the image-side surface of the negative lens element within the first lens group is smaller than the absolute value of the radius-of-curvature of the object-side surface of the positive lens element on the object side within the first lens group. The following condition (1) is satisfied: 1.95<n11??(1), wherein n11 designates the refractive index at the d-line of the negative lens element within the first lens group.
    Type: Application
    Filed: September 1, 2011
    Publication date: March 15, 2012
    Applicant: HOYA CORPORATION
    Inventor: Masaru EGUCHI
  • Publication number: 20120050864
    Abstract: A high zoom-ratio zoom lens system includes a positive first lens group, a negative second lens group, a positive third lens group and a positive fourth lens group, in that order from the object side. Upon zooming from the short focal length extremity to the long focal length extremity, at least the first through third lens groups move along the optical axis direction in a manner so that the distance between the first lens group and the second lens group increases, the distance between the second lens group and the third lens group decreases, and the distance between the third lens group and the fourth lens group increases, wherein the amount of movement of the first lens group during zooming is larger than that of the third lens group. The lens element which is provided closest to the object side within third lens group has an aspherical surface formed on each side thereof.
    Type: Application
    Filed: August 22, 2011
    Publication date: March 1, 2012
    Applicant: HOYA CORPORATION
    Inventor: Masaru EGUCHI