Patents by Inventor Yasunari Fukuta

Yasunari Fukuta 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: 10302898
    Abstract: An imaging lens system includes first and second lens groups each having a positive optical power (P1, P2) and a third lens group. During focusing, the second lens group moves. When the first lens group is divided into two groups across, as a boundary, the longest aerial distance (t1) among the axial lens-to-lens distances located on the image side of the position of half the total length of the first lens group, the object-side group being a front group and the image-side group being a rear group, the most image-side surface in the front group and the most image-side surface in the rear group are lens surfaces concave to the image side. The conditional formulae 0.2<P1/P<0.6, 0.3<P1/P2<0.9, 0.03<t1/t<0.1, and 0.05<t2/t<0.14 are fulfilled (P, the optical power of the entire system; t2, the aerial distance between the first and second lens groups in the infinity-object-distance condition; t, the total length of the system.
    Type: Grant
    Filed: December 14, 2016
    Date of Patent: May 28, 2019
    Assignee: KONICA MINOLTA, INC.
    Inventor: Yasunari Fukuta
  • Publication number: 20170176709
    Abstract: An imaging lens system includes first and second lens groups each having a positive optical power (P1, P2) and a third lens group. During focusing, the second lens group moves. When the first lens group is divided into two groups across, as a boundary, the longest aerial distance (t1) among the axial lens-to-lens distances located on the image side of the position of half the total length of the first lens group, the object-side group being a front group and the image-side group being a rear group, the most image-side surface in the front group and the most image-side surface in the rear group are lens surfaces concave to the image side. The conditional formulae 0.2<P1/P<0.6, 0.3<P1/P2<0.9, 0.03<t1/t<0.1, and 0.05<t2/t<0.14 are fulfilled (P, the optical power of the entire system; t2, the aerial distance between the first and second lens groups in the infinity-object-distance condition; t, the total length of the system.
    Type: Application
    Filed: December 14, 2016
    Publication date: June 22, 2017
    Applicant: KONICA MINOLTA, INC.
    Inventor: Yasunari FUKUTA
  • Patent number: 9036275
    Abstract: An imaging optical system, an imaging device, and a digital apparatus of the invention are provided with an optical system constituted of five lens elements having positive, negative, positive, positive, and negative refractive powers, or positive, negative, negative, positive, and negative refractive powers; and satisfy the conditional expressions: 1<f123/f<1.25 0.1<d6/f<0.15 0.30<f4/f<0.72 where f: a focal length of the entirety of the imaging optical system, f123: a combined focal length of the first lens element 11, the second lens element 12, and the third lens element 13, d6: a distance on the optical axis between the third lens element 13 and the fourth lens element 14, and f4: a focal length of the fourth lens element 14.
    Type: Grant
    Filed: May 29, 2012
    Date of Patent: May 19, 2015
    Assignee: KONICA MINOLTA, INC.
    Inventors: Yasunari Fukuta, Keiji Matsusaka
  • Patent number: 8792184
    Abstract: An image-capturing lens includes, in order from an object side: a meniscus-shaped first lens which has positive power near an optical axis; a second lens which has positive power near the optical axis and has negative power in the periphery of the second lens; and a meniscus-shaped third lens. The image-capturing lens satisfies the following conditional formulas: TL/f<1.10, 2.00<(r2+r1)/(r2?r1)<4.00, and 0.07<D2/f<0.19, where TL: the air-converted distance from the object-side surface of the first lens to the image-side surface thereof, f: the focal length of the entire system, r2: the radius of curvature of the first lens on the image side thereof, r1: the radius of curvature of the first lens on the object side thereof, D2: the distance between the first lens and the second lens.
    Type: Grant
    Filed: December 22, 2010
    Date of Patent: July 29, 2014
    Assignee: Konica Minolta Advanced Layers, Inc.
    Inventors: Kazuki Matsui, Eigo Sano, Yasunari Fukuta
  • Publication number: 20140139698
    Abstract: An imaging optical system, an imaging device, and a digital apparatus of the invention are provided with an optical system constituted of five lens elements having positive, negative, positive, positive, and negative refractive powers, or positive, negative, negative, positive, and negative refractive powers; and satisfy the conditional expressions: 1<f123/f<1.25 0.1<d6/f<0.15 0.30<f4/f<0.72 where f: a focal length of the entirety of the imaging optical system, f123: a combined focal length of the first lens element 11, the second lens element 12, and the third lens element 13, d6: a distance on the optical axis between the third lens element 13 and the fourth lens element 14, and f4: a focal length of the fourth lens element 14.
    Type: Application
    Filed: May 29, 2012
    Publication date: May 22, 2014
    Inventors: Yasunari Fukuta, Keiji Matsusaka
  • Patent number: 8659839
    Abstract: Disclosed is an imaging lens by which astigmatism and field curvature are satisfactorily corrected by arranging on a first surface a concave surface having an appropriate radius of curvature. Condition (1) defines the radius of curvature of the concave surface arranged on the object-side surface of a bonded compound lens. By fulfilling condition (1), a lens can be obtained in which astigmatism and field curvature are satisfactorily corrected. Condition (1): ?1.5<rL11/f<?5.0, wherein rL11 is the local curvature radius of the object-side surface of the first lens calculated by the equation below; f is the focus distance of the entire system. rL11={(h1)2+(s1)2}/(2s1); h1 is 1/10 of the effective radius of the object-side surface of the first lens; and s1 is the displacement amount in a direction parallel to the optical axis from the surface apex point at a lens surface height h1.
    Type: Grant
    Filed: February 17, 2011
    Date of Patent: February 25, 2014
    Assignee: Konica Minolta Advanced Layers, Inc.
    Inventors: Kazuki Matsui, Yasunari Fukuta
  • Patent number: 8587870
    Abstract: A wafer lens (10) in which the warpage of a glass substrate included therein can be prevented, having a glass substrate (12), a first resin part (14) composed of a curable resin, and a second resin part (16) composed of a curable resin. In each of the first resin part (14) and the second resin part (16), two or more lens parts (14a, 16a) are formed. A lens part of each of the first and second resin parts is located at the most objective side. A volume of the first resin of the first resin part (14) and a volume of the second resin of the second resin part (16) satisfies 0.6?Vwa/Vwb?2.1, where “Vwa” and “Vwb” are volumes of an object and image side resin, respectively.
    Type: Grant
    Filed: September 9, 2009
    Date of Patent: November 19, 2013
    Assignee: Konica Minolta Opto, Inc.
    Inventor: Yasunari Fukuta
  • Patent number: 8587871
    Abstract: Disclosed is a wafer lens in which the warpage of a glass substrate included therein can be prevented. Specifically disclosed is a wafer lens comprising a glass substrate, a first resin part composed of a curable resin, and a second resin part composed of a curable resin. In each of the first resin part and the second resin part, two or more lens parts are formed. The volume of the resin of the first resin part after the cutting and the volume of the resin of the second resin part after the cutting satisfy the condition 0.6?Vwa/Vwb?2.1, wherein “Vwa” indicates a volume of a resin on an object side and “Vwb” indicates a volume of a resin on an image side.
    Type: Grant
    Filed: February 3, 2012
    Date of Patent: November 19, 2013
    Assignee: Konica Minolta Opto, Inc.
    Inventor: Yasunari Fukuta
  • Patent number: 8558939
    Abstract: Provided is an image pickup lens composed of three lens elements and an image pickup apparatus using the same, where the image pickup lens has satisfactorily corrected aberrations despite being smaller in size than conventional image pickup lenses. As image pickup lens includes, in order from the object side, an aperture stop, a first lens, a second lens, and a third lens. The first lens is a positive lens and is a meniscus lens having a convex surface facing the object side and a concave surface facing the object side, and the third lens is a negative lens. The image pickup lens satisfies conditional expressions relating to an air gap between the second and third lenses, a focal length of the second lens, and a curvature radius of the object-side surface of the second lens.
    Type: Grant
    Filed: October 6, 2010
    Date of Patent: October 15, 2013
    Assignee: Konica Minolta Advanced Layers, Inc.
    Inventors: Kazuki Matsui, Yasunari Fukuta
  • Patent number: 8542310
    Abstract: Provided is an imaging lens, in which a space holding portion is formed outside the effective aperture of one or both of junction type compound lenses facing each other in order to hold the space between the junction type compound lenses. A mating face formed on the space holding portion which is made of the same material as that of a lens portion is brought in direct contact with a mating face provided on the other among the junction type compound lenses facing each other at the position facing the mating face of the space holding portion, outside the effective aperture of the other junction type compound lens. Alternatively, mating faces which are formed on confronting surfaces of the space holding portions formed on the facing junction type compound lenses are brought in direct contact with each other.
    Type: Grant
    Filed: July 2, 2009
    Date of Patent: September 24, 2013
    Assignee: Konica Minolta Opto, Inc.
    Inventors: Hiroshi Oshitani, Yasunari Fukuta
  • Publication number: 20130163101
    Abstract: An image capturing lens is disclosed, which is compact and capable of capturing an image at a wide angle though realizing low cost performance by enabling mass productions of wafer-scale lenses, and an image capturing device is disclosed, which uses this image capturing lens. For the purpose of attaining short focusing, a wide angle of view can be ensured by optimally disposing the power of a first lens block and the power of a second lens block so that a value of a conditional formula (1) becomes higher than a lower limit. Hereat, a wider angle can be attained by strengthening the positive power of the second lens block against the first lens block without increasing the overall length. While on the other hand, the value of the conditional formula (1) becomes lower than an upper limit, whereby the power of the second lens block is prevented from being excessively strengthened, the lens units of the second lens block can be configured with a small sag quantity, and moldability can be kept preferable, 0.
    Type: Application
    Filed: September 5, 2011
    Publication date: June 27, 2013
    Inventors: Yasunari Fukuta, Kazuki Matsui, Ryouta Ishikawa, Takashi Kawasaki
  • Patent number: 8472125
    Abstract: A variable power optical system (1) comprises a first lens group (11) having a negative optical power, a second lens group (12) having a positive optical power, and a third lens group (13). The first to third lens groups are arranged in order from the object side to the image side. The first lens group (11) is composed of one negative lens (111) and is fixed in variable power. The third lens group (13) includes at least one aspherical surface. When the third lens group is divided into a front group and a rear group with the largest air space in the third group, the front group has a negative optical power, and the rear group has a positive optical power.
    Type: Grant
    Filed: November 4, 2008
    Date of Patent: June 25, 2013
    Assignee: Konica Minolta Opto, Inc.
    Inventor: Yasunari Fukuta
  • Patent number: 8456564
    Abstract: Provided are a wafer scale lens, which is so short in an optical total length with respect to an image height that it can correct an aberration satisfactory, and an optical system including the wafer scale lens and having a thin lens element on the side closest to the image. The optical system includes a first lens having a positive refractive power relative to an object, and a second lens arranged on the side of the image of the first lens and having a recessed shape on the side of the object. At least one lens is arranged on the side of the second lens.
    Type: Grant
    Filed: June 25, 2008
    Date of Patent: June 4, 2013
    Assignee: Konica Minolta Opto, Inc.
    Inventors: Yusuke Hirao, Keiji Matsusaka, Yasunari Fukuta
  • Patent number: 8368786
    Abstract: To provide an inexpensive image pickup lens ensuring mass productivity and preventing deterioration of images due to fluctuation of a paraxial image-point position caused by water absorption, image pickup device, digital apparatus, and a manufacturing method of the image pickup lens, the image pickup lens includes: at least one lens block including a lens substrate, and a lens portion or lens portions formed on at least one of an object-side surface or an image-side surface of the lens substrate. The lens portion is formed of an energy-curable resin material which is different from a material of the lens substrate. At least one lens portion has a dimension change rate caused by water absorption which is larger than a dimension change rate caused by water absorption of the lens substrate, and satisfies the predetermined expression about a change in refractive index the energy-curable resin material caused by water absorption.
    Type: Grant
    Filed: March 16, 2009
    Date of Patent: February 5, 2013
    Assignee: Konica Minolta Opto, Inc.
    Inventor: Yasunari Fukuta
  • Publication number: 20120320261
    Abstract: Disclosed is an imaging lens by which astigmatism and field curvature are satisfactorily corrected by arranging on a first surface a concave surface having an appropriate radius of curvature. Condition (1) defines the radius of curvature of the concave surface arranged on the object-side surface of a bonded compound lens. By fulfilling condition (1), a lens can be obtained in which astigmatism and field curvature are satisfactorily corrected. Condition (1): ?1.5<rL11/f<?5.0, wherein rL11 is the local curvature radius of the object-side surface of the first lens calculated by the equation below; f is the focus distance of the entire system. rL11={(h1)2+(s1)2}/(2s1); h1 is 1/10 of the effective radius of the object-side surface of the first lens; and s1 is the displacement amount in a direction parallel to the optical axis from the surface apex point at a lens surface height h1.
    Type: Application
    Filed: February 17, 2011
    Publication date: December 20, 2012
    Inventors: Kazuki Matsui, Yasunari Fukuta
  • Publication number: 20120293874
    Abstract: An image-capturing lens includes, in order from an object side: a meniscus-shaped first lens which has positive power near an optical axis; a second lens which has positive power near the optical axis and has negative power in the periphery of the second lens; and a meniscus-shaped third lens. The image-capturing lens satisfies the following conditional formulas: TL/f<1.10, 2.00<(r2+r1)/(r2?r1)<4.00, and 0.07<D2/f<0.19, where TL: the air-converted distance from the object-side surface of the first lens to the image-side surface thereof, f: the focal length of the entire system, r2: the radius of curvature of the first lens on the image side thereof, r1: the radius of curvature of the first lens on the object side thereof, D2: the distance between the first lens and the second lens.
    Type: Application
    Filed: December 22, 2010
    Publication date: November 22, 2012
    Inventors: Kazuki Matsui, Eigo Sano, Yasunari Fukuta
  • Publication number: 20120268829
    Abstract: Disclosed is a wafer lens in which the warpage of a glass substrate included therein can be prevented. Specifically disclosed is a wafer lens comprising a glass substrate, a first resin part composed of a curable resin, and a second resin part composed of a curable resin. In each of the first resin part and the second resin part, two or more lens parts are formed. The first resin part contains the resin in the same volume as that in the second resin part.
    Type: Application
    Filed: February 3, 2012
    Publication date: October 25, 2012
    Inventor: Yasunari FUKUTA
  • Patent number: 8274745
    Abstract: An image pickup lens, comprises sequentially from an object side: an aperture stop, a first lens being a positive meniscus lens which has a convex surface at the object side and a concave surface at an image side opposite to the object side, and a second lens having a concave surface at the object side and an image side surface whose radius of curvature on an paraxial region is infinite or a negative value, wherein the first lens is the second lens and the image side surface of the second lens includes an aspheric surface to make a positive power strong toward a lens peripheral region, and wherein the image pickup lens is made to satisfy the following conditional formulas. 1.55<n1<1.80??(1) 0.4<D3/f<0.6??(2) 40.0<?2<90.
    Type: Grant
    Filed: April 18, 2011
    Date of Patent: September 25, 2012
    Assignee: Konica Minolta Opto, Inc.
    Inventors: Yasunari Fukuta, Masae Sato, Takashi Kawasaki, Kazuki Matsui
  • Patent number: 8270095
    Abstract: A variable-power optical system includes, in order from an object side thereof: a first lens group with a negative optical power; a second lens group with a positive optical power; a third lens group with a negative optical power; and a fourth lens group with a positive optical power. An interval between the first lens group and the second lens group decreases when a power of the variable-power optical system varies from a wide-angle end to a telephoto end. The second lens group includes at least one aspheric surface. The variable-power optical system satisfies the predetermined conditional expressions.
    Type: Grant
    Filed: November 27, 2007
    Date of Patent: September 18, 2012
    Assignee: Konica Minolta Opto, Inc.
    Inventors: Keiji Matsusaka, Soh Ohzawa, Yasunari Fukuta
  • Patent number: 8270098
    Abstract: Disclosed is an image pickup lens (LN) including at least three lens blocks (BK) each equipped with a lens substrate (LS) being a parallel flat plate, and a lens or lenses (L) having a positive or negative power and being connected to at least one of an object-side surface and an image-side surface of the lens substrate (LS). In the image pickup lens (LN), a first lens block (BK1) arranged at a closest position to an object side has a positive powder, a second lens block (BK2) arranged at an image side of the first lens block (BK1) has s negative power, and predetermined conditional expressions are satisfied, whereby the image pickup lens capable of being easily produced at a low cost and having a high performance and a compact size can be provided.
    Type: Grant
    Filed: February 19, 2009
    Date of Patent: September 18, 2012
    Assignee: Konica Minolto Opto, Inc.
    Inventors: Yasunari Fukuta, Keiji Matsusaka