Patents by Inventor Katsuyoshi Sasagawa
Katsuyoshi Sasagawa 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).
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S-alkyl thiocarbamate base resin, plastic lens comprising the resin, and process for making the lens
Patent number: 4946923Abstract: Disclosed herein are a novel and highly refractive S-alkyl thiocarbamate base resin useful in preparing lenses and a process for producing the resin comprising reacting one or more of polyisocyanate compounds and one or more of mercapto compound having at least one hydroxyl group, a plastic lens made of the resin, and a process for making a plastic lens of high profile regularity from the resin by using internal mold releasing agents in the casting polymerization process.Type: GrantFiled: February 15, 1989Date of Patent: August 7, 1990Assignee: Mitsui Toatsu Chemicals, Inc.Inventors: Teruyuki Nagata, Koju Okazaki, Nobuyuki Kajimoto, Tohru Miura, Yoshinobu Kanemura, Katsuyoshi Sasagawa -
Patent number: 4933760Abstract: The movement detecting circuit of this invention has a band detecting circuit for detecting the signal components of a plurality of image signals. The output signal of this band detecting circuit is input into a band varying circuit for varying the band characteristics of the image signals. The plural image signals having had the band characteristics varied in the band varying circuit are input into a difference signal producing circuit which produces a difference signal of pixel signals approaching respective plural image signals representing the images of an object imaged at different times. A correlation amount between the corresponding plural difference signals produced by the difference signal producing circuit is detected in a correlation detecting circuit. The signal output detected in the correlation detecting circuit is quantified in a quantifying circuit.Type: GrantFiled: August 1, 1989Date of Patent: June 12, 1990Assignee: Olympus Optical Co., Ltd.Inventors: Shinji Yamashita, Masao Uehara, Masahide Kanno, Masahiko Sasaki, Akinobu Uchikubo, Jun Hasegawa, Takehiro Nakagawa, Katsuyoshi Sasagawa, Katsuyuki Saito
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Patent number: 4933757Abstract: There is disclosed an endoscope apparatus wherein it is judged whether a still picture is to be displayed or not for the movement quantity from a movement detecting circuit wherein difference signals are produced between pixels approaching a plurality of image signals of the same object imaged at different times and further the correlation between the corresponding difference signals is detected and is then quantified in a period of one field/frame.Type: GrantFiled: July 12, 1989Date of Patent: June 12, 1990Assignee: Olympus Optical Co., Ltd.Inventors: Masahide Kanno, Masao Uehara, Masahiko Sasaki, Katsuyuki Saito, Akinobu Uchikubo, Shinji Yamashita, Katsuyoshi Sasagawa, Jun Hasegawa, Takehiro Nakagawa
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Patent number: 4929707Abstract: Polyurethane base lens resins obtained by reacting one or more of sulfur-containing polyisocyanates compound with one or more of sulfur-containing polyols, and polyurethane base lenses comprising these resins are disclosed.A method for preparing polyurethane base lenses which comprises adding internal mold releasing agents to the mixture of the above polyisocyanates and polyols prior to casting polymerization is also disclosed.Type: GrantFiled: February 3, 1989Date of Patent: May 29, 1990Assignee: Mitsui Toatsu Chemicals, Inc.Inventors: Teruyuki Nagata, Koju Okazaki, Nobuyuki Kajimoto, Tohru Miura, Yoshinobu Kanemura, Katsuyoshi Sasagawa
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Patent number: 4928172Abstract: An endoscope using a solid state imaging device characterized by comprising a solid state imaging device capable of imaging an object image, a light emitting means giving an illuminating light to said object, a first level detecting means fed with a video signal from said solid state imaging device and detecting the level of this signal, a first level comparing means comparing the detected level of this detecting means and a preset first reference level with each other and outputting a first control signal corresponding to the level difference, a light adjusting means fed with this first control signal and adjusting the illuminating light from said light emitting means on the basis of this signal, a gain variable amplifying means taking in the video signal from the detecting end in said first level detecting means and amplifying it, a second level detecting means detecting the level of the signal from this amplifying means and a circuit means comparing the detected level of this detecting means and a preset sType: GrantFiled: September 15, 1988Date of Patent: May 22, 1990Assignee: Olympus Optical Co., Ltd.Inventors: Masao Uehara, Akinobu Uchikubo, Katsuyuki Saito, Masahide Kanno, Jun Hasegawa, Masahiko Sasaki, Katsuyoshi Sasagawa, Shinji Yamashita
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Patent number: 4926258Abstract: An apparatus has a simple configuration using a drive circuit for outputting horizontal transfer clocks with a given frequency regardless of the number of picture elements of a solid state imaging device which constitutes an imaging means of an endoscope and the reading structure thereof so that it can be used for an endoscope having a different number of picture elements.Type: GrantFiled: October 11, 1988Date of Patent: May 15, 1990Assignee: Olympus Optical Co., Ltd.Inventors: Masahiko Sasaki, Masao Uehara, Masahide Kanno, Shinji Yamashita, Katsuyoshi Sasagawa, Jun Hasegawa, Katsuyuki Saito, Akinobu Uchikubo
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Patent number: 4901143Abstract: There is provided a frozen picture memorizing memory holding as a frozen picture image a picture image signal imaged by an electronic endoscope. By the operation of a frozen picture directing switch, whether the frozen picture is adapted to the memorizing condition or not is judged through a picture image movement detecting circuit. In case it is judged to be adapted to the memorizing condition, the picture image signal is memorized actually as a frozen picture image to obtain a clear frozen picture having little color smear and fogging.Type: GrantFiled: February 16, 1989Date of Patent: February 13, 1990Assignee: Olympus Optical Co., Ltd.Inventors: Masao Uehara, Masahide Kanno, Katsuyuki Saito, Akinobu Uchikubo, Katsuyoshi Sasagawa, Shinji Yamashita, Akira Kusumoto, Kazunari Nakamura, Shinichiro Hattori, Keiichi Hiyama, Jun Hasegawa, Masahiko Sasaki, Takehiro Nakagawa
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Patent number: 4891697Abstract: In an electronic endoscope apparatus of the type which uses a solid state imaging device to effect photoelectric conversion of an optical image, the image signal read from the solid state imaging device is subjected to signal processing for changing image size so as to effect enlargement/reduction of an image to be displayed on a monitor, and then the outline of the image signal is enhanced by an outline enhancement circuit. With this arrangement, it is possible to achieve natural outline enhancement.Type: GrantFiled: November 1, 1988Date of Patent: January 2, 1990Assignee: Olympus Optical Co., Ltd.Inventors: Katsuyuki Saito, Masahide Kanno, Masao Uehara, Masahiko Sasaki, Katsuyoshi Sasagawa, Shinji Yamashita, Akinobu Uchikubo, Jun Hasegawa
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Patent number: 4891695Abstract: The electronic endoscope apparatus of this invention is provided with a first endoscope apparatus having a solid state imaging device whereby an object image obtained from an observing window provided in the tip part of an insertable part inserted into a body cavity is formed and is converted to an electric signal to be output and a second endoscope apparatus having a solid state imaging device different from the solid state imaging device provided in the first endoscope apparatus in shape or number of pixels but the same in at least one pixel forming element. The first and second endoscope apparatus are connected to a video processing circuit and the electric signal output from the solid state imaging device is processed to be a video signal. The signal procesed by the video processing circuit is output to a displaying apparatus to display the object image.Type: GrantFiled: December 30, 1988Date of Patent: January 2, 1990Assignee: Olympus Optical Co. Ltd.Inventors: Akinobu Uchikubo, Masao Uehara, Masahide Kanno, Jun Hasegawa, Masahiko Sasaki, Katsuyuki Saito, Katsuyoshi Sasagawa, Shinji Yamashita
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Patent number: 4887153Abstract: The bandwidth of a signal read out from a solid-state image element is standardized by the application of a drive signal including a horizontal transfer clock of a fixed frequency to the solid-state image elements each with a different number of pixels. In consequence, part of circuitry capable of processing a signal without changing the circuit constant is increased.Type: GrantFiled: September 8, 1988Date of Patent: December 12, 1989Assignee: Olympus Optical Co., Ltd.Inventors: Masao Uehara, Masahiko Sasaki, Masahide Kanno, Jun Hasegawa, Shinji Yamashita, Katsuyoshi Sasagawa
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Patent number: 4868647Abstract: An endoscope is provided with an isolation circuit which electrically isolates the ground of the input side and of the output side from each other. The isolation circuit is provided in a signal processing circuit which processes the electrical signal obtained by conversion of the optical image obtained by an objective optical system provided at the end of a long thin insertion portion to be inserted into a body cavity in a solid-state image pickup device. A differential drive device drives the isolation circuit by the differential output thereof, whereby any noise is suppressed and isolation is sufficiently performed.Type: GrantFiled: August 22, 1988Date of Patent: September 19, 1989Assignee: Olympus Optical Co., Ltd.Inventors: Masao Uehara, Akinobu Uchikubo, Jun Hasegawa, Masahiko Sasaki, Masahide Kanno, Shinji Yamashita, Katsuyoshi Sasagawa
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Patent number: 4791185Abstract: Disclosed herein is a colorless transparent plastic lens having high refractivity and low dispersion. The lens is light, has heat resistance sufficient for post processing, and is excellent in grinding machinability and impact resistance. It is made of a sulfur-containing urethane resin, which is a polymer of a specific polythiol and a particular polyisocyanate of at least bifunctionality.Type: GrantFiled: November 5, 1987Date of Patent: December 13, 1988Assignee: Mitsui Toatsu Chemicals, IncorporatedInventors: Yoshinobu Kanemura, Katsuyoshi Sasagawa, Masao Imai, Teruyuki Nagata, Nobuyuki Kajimoto
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Patent number: 4775733Abstract: Disclosed herein are a high-refractivity plastic lens resin obtained by polymerizing under heat at least one polyisocyanate (I): ##STR1## wherein X means a hydrogen, chlorine or bromine atom or a methyl or ethyl group, Z is a hydrogen atom or a methyl group, a stands for an integer of 1-4, b is an integer of 2-4, and a+b is not greater than 6 (a+b.ltoreq.6), with at least one polythiol (II): ##STR2## wherein R means a methyl, ethyl, chloromethyl or bromomethyl group, m stands for an integer of 0-2 and n is 4-m and/or at least one polythiol (III): ##STR3## wherein X means a hydrogen, chlorine or bromine atom or a methyl or ethyl group, Y denotes an oxygen or sulfur atom, r stands for 0 or 1, s is an integer of 0-2, p is an integer of 2-4, q is an integer of 1-4 and p+q is not greater than 6 (p+q.ltoreq.6), in such amounts that the --NCO/--SH molar ratio falls within 0.5-3.0, as well as a lens made of the above resin.Type: GrantFiled: February 27, 1987Date of Patent: October 4, 1988Assignee: Mitsui Toatsu Chemicals, IncorporatedInventors: Yoshinobu Kanemura, Masao Imai, Katsuyoshi Sasagawa, Nobuyuki Kajimoto, Teruyuki Nagata
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Patent number: 4707425Abstract: An optical recording method which comprises providing a recording layer containing a recording susbstance that has an absorption maximum in the visible and near infrared wavelength region of 600 to 1,200 nm and loses or diminishes its power to absorb visible or near infrared radiation in the aforesaid wavelength region upon exposure to ultraviolet radiation, X-rays, an electron beam or an ion beam, and irradiating desired locations of the recording layer with ultraviolet radiation, X-rays, an electron beam or ion beam to form a pattern based on the presence or absence, or variation in strength, of the power to absorb visible or near infrared radiation in the aforesaid wavelength region so as to record information in the recording layer; a method for reading optically recorded information which comprises illuminating a pattern formed as described above with laser light having a wavelength in the aforesaid visible and near infrared region and detecting the presence or absence, or variation in intensity, of absoType: GrantFiled: June 26, 1986Date of Patent: November 17, 1987Assignee: Mitsui Toatsu Chemicals, IncorporatedInventors: Katsuyoshi Sasagawa, Kunio Nishihara, Hiroshi Ozawa, Masao Imai
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Patent number: 4707430Abstract: Disclosed herein is an optical recording medium which includes a recording layer composed of (a) an organometallic complex having an absorption maximum in the wavelength range of 600-1200 nm, (b) a resinous binder and (c) a sensitizer capable of generating radicals upon exposure to ultraviolet rays. The recording of information on the recording layer is effected with ease by exposure to ultraviolet rays. The reproduction of recorded information is effected by a laser beam having an oscillatory wavelength in the visible or near infrared wavelength range.Type: GrantFiled: February 26, 1986Date of Patent: November 17, 1987Inventors: Hiroshi Ozawa, Yoichi Hosono, Sumio Hirose, Katsuyoshi Sasagawa, Masao Imai
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Patent number: 4632969Abstract: Disclosed herein are a resin for high-refractivity lenses, formed by copolymerizing at least one unifunctional monomer selected from the group of compounds represented by the following general formula (I); ##STR1## wherein X means a oxygen or sulfur atom, Y denotes a chlorine or bromine atom, R is a hydrogen atom or a methyl group, m is 0 or 1 and n stands for an integer of 1-5 with at least one bifunctional monomer selected from the group of compounds represented by the following general formula (II); ##STR2## wherein Z is a hydrogen, chlorine or bromine atom, R means a hydrogen atom or a methyl group and p stands for an integer 1-4 as well as high-refractivity lenses made of such a resin.Type: GrantFiled: March 2, 1984Date of Patent: December 30, 1986Assignee: Mitsui Toatsu Chemicals, Inc.Inventors: Katsuyoshi Sasagawa, Masao Imai, Kimio Kanno
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Patent number: 4542201Abstract: Disclosed herein are a resin for high-refractivity lenses, formed by copolymerizing at least one carbonate compound represented by the general formula (I): ##STR1## wherein X is a hydrogen, chlorine or bromine atom, and R is a hydrogen atom or a methyl group with at least one unifunctional monomer represented by the general formula (II): ##STR2## wherein R' is a hydrogen atom or a methyl group and Y represents ##STR3## wherein X' is a chlorine or bromine atom, q is an integer of 0-5, and r is 0 or 1 as well as high-refractivity lenses made of such a resin.The lens-making resin according to this invention has a high refractive index, is excellent in processability such as grinding processability, thermal resistance, solvent resistance and impact resistance. Moreover, it features outstanding miscibility between the unifunctional monomer and the carbonate upon copolymerization thereof, and minimized polymerization strain.Type: GrantFiled: November 6, 1984Date of Patent: September 17, 1985Assignee: Mitsui Toatsu Chemicals IncorporatedInventors: Yoshinobu Kanemura, Masao Imai, Katsuyoshi Sasagawa
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Patent number: 4529684Abstract: A composition obtained by incorporating a benzenedithiol nickel complex in a liquid formulation containing a solvent and, as a binder, an organic polymer or containing a solvent, organic color-producing substance, acidic substance and binder suitable for producing a laser beam recording/reading means having an absorption band in the region of 800-950 nm.Type: GrantFiled: November 15, 1984Date of Patent: July 16, 1985Assignee: Mitsui Toatsu Chemicals, IncorporatedInventors: Katsuyoshi Sasagawa, Eiichi Noda, Masao Imai
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Patent number: 4522993Abstract: Disclosed herein are a resin for high-refractivity lenses, formed by copolymerizing at least one nucleus-halogenated benzene dicarboxylate represented by the following general formula (I): ##STR1## wherein X means a chlorine or bromine atom, n is 2 or 4, m stands for 0 or 1 and R denotes a hydrogen atom or a methyl group with at least one unifunctional monomer having a refractive index of at least 1.55 as a homopolymer, capable of undergoing a radical polymerization and containing an aromatic ring as well as high-refractivity lenses made of such a resin. The lens-making resin according to this invention features a high refractive index, excellent processability such as superb grinding processability and high impact resistance, outstanding miscibility between the unifunctional monomer and bifunctional monomer upon copolymerization thereof, and minimized polymerization strain.Type: GrantFiled: March 2, 1984Date of Patent: June 11, 1985Assignee: Mitsui Toatsu Chemicals, IncorporatedInventors: Katsuyoshi Sasagawa, Akio Hyugaji, Masao Imai
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Patent number: 4508655Abstract: Metal complexes of halogen-substituted o-benzenedithiols of the general formula: ##STR1## wherein X represents a chlorine or bromine atom, Y and Z represent each a hydrogen or chlorine atom when X is a chlorine atom or they represent each a hydrogen or bromine atom when X is a bromine atom, M represents a nickel, palladium or platinum atom, and A represents a quaternary ammonium group, are provided.These metal complexes have a high compatibility with resins and are useful as near infrared absorbers. Halogen-substituted o-benzenedithiols of the formula: ##STR2## wherein X, Y and Z have the same meaning as above; used as starting materials for the above metal complexes are also new compounds.Type: GrantFiled: December 9, 1982Date of Patent: April 2, 1985Assignee: Mitsui Toatsu Chemicals, Inc.Inventors: Katsuyoshi Sasagawa, Masao Imai