Patents by Inventor Yoshitsugu Kohno
Yoshitsugu Kohno 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: 8777421Abstract: A projection optical system includes first and second optical systems. The first optical system includes a transmissive-refractive element and the second optical system includes a reflective-refractive element. An image formed by a spatial light modulator is projected by the projection optical system on a projection surface. A light beam that travels along an optical path that leads from the second optical system to the projection surface in an optical path between a center of the image formed by the spatial light modulator and the projection surface is projected at an angle with respect to a normal to the projection surface. An optical axis of the first optical system is folded to a folded position by an optical path deflecting unit in an area of the first optical system where the light beam entering the optical path deflecting unit is a converging light beam or a substantially parallel light beam.Type: GrantFiled: July 26, 2013Date of Patent: July 15, 2014Assignee: Ricoh Company, Ltd.Inventors: Atsushi Takaura, Kazuhiro Fujita, Issei Abe, Akihiro Yamakage, Osamu Nagase, Yoshitsugu Kohno
-
Patent number: 8641208Abstract: Disclosed are a projection display apparatus and a projection optics provided in the projection display apparatus. The projection optics has a refractive optics and a reflective optics. In the refractive optics, a lens (non-circular lens) provided on a reflective optics side has a non-circular shape forming part of an imaginary circular region whose center is an optical axis center of the refractive optics. In other words, the non-circular lens has a shape of a cut-out portion of an imaginary circular lens having an optical axis center coinciding with the optical axis center of the refractive optics.Type: GrantFiled: April 1, 2011Date of Patent: February 4, 2014Assignees: Sanyo Electric Co., Ltd., Ricoh Optical Industries Co., Ltd.Inventors: Ryuhei Amano, Takashi Ikeda, Kazuhisa Takahashi, Yoshitsugu Kohno, Osamu Nagase
-
Publication number: 20130308106Abstract: A projection optical system includes first and second optical systems. The first optical system includes a transmissive-refractive element and the second optical system includes a reflective-refractive element. An image formed by a spatial light modulator is projected by the projection optical system on a projection surface. A light beam that travels along an optical path that leads from the second optical system to the projection surface in an optical path between a center of the image formed by the spatial light modulator and the projection surface is projected at an angle with respect to a normal to the projection surface. An optical axis of the first optical system is folded to a folded position by an optical path deflecting unit in an area of the first optical system where the light beam entering the optical path deflecting unit is a converging light beam or a substantially parallel light beam.Type: ApplicationFiled: July 26, 2013Publication date: November 21, 2013Inventors: Atsushi TAKAURA, Kazuhiro Fujita, Issei Abe, Akihiro Yamakage, Osamu Nagase, Yoshitsugu Kohno
-
Patent number: 8529070Abstract: A projection optical apparatus capable of providing high image quality and having a reduced size is disclosed. The projection optical apparatus includes a light valve and a projection optical system including a first optical system having a transmissive-refractive element and a second optical system having a reflective-refractive element. An image formed on the light valve is projected by the projection optical system on a projection surface. The optical axis in the first optical system is folded both vertically and horizontally. The first group of the first optical system is contained in a space (dead space) whose lower limit is defined by a lower edge of the second optical system, thereby reducing the depth of the apparatus.Type: GrantFiled: September 2, 2008Date of Patent: September 10, 2013Assignee: Ricoh Company, Ltd.Inventors: Atsushi Takaura, Kazuhiro Fujita, Issei Abe, Akihiro Yamakage, Osamu Nagase, Yoshitsugu Kohno
-
Patent number: 8087789Abstract: A projection optical system includes a first refracting optical system having a plurality of lenses, a first reflecting optical system, and a second reflecting optical system. The first reflecting optical system is disposed on a side of a projection port with respect to an optical axis of the first refracting optical system, and has a positive optical power to reflect light incident through the first refracting optical system in a direction opposite to the side of the projection port. The second reflecting optical system is operable to reflect the light reflected on the first reflecting optical system toward the projection port.Type: GrantFiled: December 9, 2008Date of Patent: January 3, 2012Assignees: Sanyo Electric Co., Ltd., Ricoh Optical Industries Co., Ltd.Inventors: Ryuhei Amano, Takashi Ikeda, Shinichi Okuno, Osamu Nagase, Yoshitsugu Kohno
-
Publication number: 20110292355Abstract: Disclosed are a projection display apparatus and a projection optics provided in the projection display apparatus. The projection optics has a refractive optics and a reflective optics. In the refractive optics, a lens (non-circular lens) provided on a reflective optics side has a non-circular shape forming part of an imaginary circular region whose center is an optical axis center of the refractive optics. In other words, the non-circular lens has a shape of a cut-out portion of an imaginary circular lens having an optical axis center coinciding with the optical axis center of the refractive optics.Type: ApplicationFiled: April 1, 2011Publication date: December 1, 2011Applicants: RICOH OPTICAL INDUSTRIES CO., LTD., SANYO ELECTRIC CO., LTD.Inventors: Ryuhei AMANO, Takashi IKEDA, Kazuhisa TAKAHASHI, Yoshitsugu KOHNO, Osamu NAGASE
-
Publication number: 20100195061Abstract: A projection optical apparatus capable of providing high image quality and having a reduced size. The projection optical apparatus comprises a light valve and a projection optical system including a first optical system (5) having a transmissive-refractive element and a second optical system (3?) having a reflective-refractive element. An image formed on the light valve is projected by the projection optical system on a projection surface (4). The optical axis in the first optical system (5) is folded both vertically and horizontally. The first group (5A) of the first optical system is contained in a space (dead space) whose lower limit is defined by a lower edge of the second optical system (3?)/thereby reducing the depth of the apparatus.Type: ApplicationFiled: September 2, 2008Publication date: August 5, 2010Inventors: Atsushi Takaura, Kazuhiro Fujita, Issei Abe, Akihiro Yamakage, Osamu Nagase, Yoshitsugu Kohno
-
Publication number: 20090153809Abstract: A projection optical system includes a first refracting optical system having a plurality of lenses, a first reflecting optical system, and a second reflecting optical system. The first reflecting optical system is disposed on a side of a projection port with respect to an optical axis of the first refracting optical system, and has a positive optical power to reflect light incident through the first refracting optical system in a direction opposite to the side of the projection port. The second reflecting optical system is operable to reflect the light reflected on the first reflecting optical system toward the projection port.Type: ApplicationFiled: December 9, 2008Publication date: June 18, 2009Applicants: SANYO ELECTRIC CO., LTD., RICOH OPTICAL INDUSTRIES CO., LTD.Inventors: Ryuhei AMANO, Takashi Ikeda, Shinichi Okuno, Osamu Nagase, Yoshitsugu Kohno
-
Patent number: 5311364Abstract: A reading lens for a scanner to read an original in a reduced magnification, the lens comprising six lenses, i.e., from a first lens to a sixth lens in order on an optical axis. The first lens is a positive lens having a first lens-surface and a second lens-surface. The second lens is a negative lens disposed in contact with the first lens and has the second lens-surface in common with the first lens and a third lens-surface. The third lens is a meniscus lens and has a fourth lens-surface and a fifth lens-surface. The fourth lens is a meniscus lens and has a sixth lens-surface and a seventh lens-surface. The fifth lens is a negative lens and has a eighth lens-surface and a ninth lens-surface. The sixth lens is a positive lens disposed in contact with the fifth lens and has the ninth lens-surface in common with the fifth lens and a tenth lens-surface. At least one of the ten lens-surfaces is formed as an aspherical surface.Type: GrantFiled: June 22, 1992Date of Patent: May 10, 1994Assignee: Ricoh Company, Ltd.Inventors: Yuichiro Kanoshima, Taira Kouchiwa, Kiichiro Nishina, Kohji Ichimiya, Yoshitsugu Kohno, Naomi Harada
-
Patent number: 5112580Abstract: Chlorine is produced by reacting hydrogen chloride and oxygen in the presence of a chromium oxide catalyst in a reactor whose catalyst-contacting part is lined with one of lining materials represented by the following general formula (I):M.sub.a X.sub.b (I)wherein M can be boron, aluminum, silicon, titanium, zirconium or chromium, X denotes oxygen, nitrogen or carbon, a is an integer of 1-2 and b stands for an integer of 1-3 or with a mixture of at least two of the lining materials. The above process and reactor are effective in maintaining the activity of the catalyst.Type: GrantFiled: May 21, 1990Date of Patent: May 12, 1992Assignee: Mitsui Toatsu Chemicals, IncorporatedInventors: Masanobu Ajioka, Shinji Takenaka, Hiroyuki Itoh, Masafumi Kataita, Yoshitsugu Kohno
-
Patent number: 5034209Abstract: Chlorine is produced by reacting hydrogen chloride and oxygen in the presence of a chromium oxide catalyst in a reactor whose catalyst-contacting part is lined with one of lining materials represented by the following general formula(I):M.sub.a X.sub.b (I)wherein M means boron, aluminum, silicon, titanium, zirconium or chromium, X denotes oxygen, nitrogen or carbon, a is an integer of 1-2 and b stands for an integer of 1-3 or with a mixture of at least two of the lining materials. The above process and reactor are effective in maintaining the activity of the catalyst.Type: GrantFiled: April 13, 1990Date of Patent: July 23, 1991Assignee: Mitsui Toatsu Chemicals, IncorporatedInventors: Masanobu Ajioka, Shinji Takenaka, Hiroyuki Itoh, Masafumi Kataita, Yoshitsugu Kohno
-
Patent number: 4956169Abstract: Chlorine is produced by reacting hydrogen chloride and oxygen in the presence of a chromium oxide catalyst in a reactor whose catalyst-contacting part is lined with one of lining materials represented by the following general formula (I):M.sub.a X.sub.b (I)wherein M means boron, aluminum, silicon, titanium, zirconium or chromium, X denotes oxygen, nitrogen or carbon, a is an integer of 1-2 and b stands for an integer of 1-3 or with a mixture of at least two of the lining materials. The above process and reactor are effective in maintaining the activity of the catalyst.Type: GrantFiled: March 18, 1988Date of Patent: September 11, 1990Assignee: Mitsui Toatsu Chemicals, IncorporatedInventors: Masanobu Ajioka, Shinji Takenaka, Hiroyuki Itoh, Masafumi Kataita, Yoshitsugu Kohno
-
Patent number: 4256885Abstract: A process for efficiently preparing 1-(2-tetrahydrofuryl)-5-fluorouracil useful as an antitumor agent or an antiviral agent which comprises reacting 5-fluorouracil with 2,3-dihydrofuran. This reaction proceeds advantageously in the presence of a reaction accelerator such as a Lewis acid in a polar solvent such as pyridine.Type: GrantFiled: December 10, 1976Date of Patent: March 17, 1981Assignee: Mitsui Toatsu Kagaku Kabushiki KaishaInventors: Atsushi Kojima, Yoshitsugu Kohno, Yoshimasa Ike, Tatsuro Yokoyama, Makoto Odate