Patents by Inventor Yoichi Yamamoto
Yoichi Yamamoto 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: 5245438Abstract: An image formation apparatus includes a writing device for selectively writing image data on a liquid crystal cell by beam light, a printer for printing out an image on a recording medium, an erasing device for erasing the image written on the liquid crystal cell by a beam of light from a specified region, and a controller for controlling the writing device for writing a novel image in the region from which the previously written image has been erased.Type: GrantFiled: August 26, 1991Date of Patent: September 14, 1993Assignee: Sharp Kabushiki KaishaInventors: Yoichi Yamamoto, Masao Narumiya, Hirokazu Fujita
-
Patent number: 5170270Abstract: An image writing device including a beam source emitting laser beam, a memory for storing a plurality of frames of image data, a modulator for modulating the laser beam with the image data, at least one liquid crystal cell, a scanner for scanning the liquid crystal cell with the laser beam sweeping the same, a shift device for shifting the liquid crystal cell in the direction orthogonal to the scanning direction, and controller for reading the image data from the memory and actuating the laser beam to write the plurality of frames of images in different areas on the liquid crystal cell.Type: GrantFiled: August 28, 1990Date of Patent: December 8, 1992Assignee: Sharp CorporationInventors: Yoichi Yamamoto, Masao Narumiya
-
Patent number: 5134354Abstract: When a workpiece is cut or otherwise machined by a machine using a servo motor control apparatus having a position feedback loop, a velocity feedback loop, and a current feedback loop, it is the common practice to preset the instructed current value to a voltage corresponding to friction torque when rotation of the motor is started or reversed. This is to compensate for the response delay of the motor introduced by the friction torque. The present invention relates to improvements in this technique. After the instructed motor velocity changes from a positive value, to a negative value or vice versa, or after the detected motor velocity changes from a positive value to a nonpositive value or from a negative value to a nonnegative value, the value of the integration element of a velocity control portion is reversed according to a function. The obtained output value is added to the instructed current value or to the integration term to compensate for the response delay, thus reducing machining error.Type: GrantFiled: December 3, 1990Date of Patent: July 28, 1992Assignee: Kabushiki Kaisha Yaskawa Denki SeisakushoInventors: Yoichi Yamamoto, Takayuki Tohya, Yoshiji Hiraga
-
Patent number: 5099273Abstract: Image formation device includes an optical image memory which is shaped like a flat board and includes an image area formed almost in the center portion for storing an image and a void area surrounding the image area, where no image is written, the image stored being optically recognizable and able to be repetitively read; image writing means for writing the image in the optical image memory by the selectively irradiating the image area in accordance with data on a desired image; exposing means for exposing a photosensitive material by irradiating light through the optical image memory to the photosensitive material from which color coupler in a non-exposed portion is discharged by applying pressure; light control means for controlling a width of light irradiated to an area of the photosensitive material through the void area in the direction of the widthwise extension of the photosensitive material so that the width of light is identical with the width of the photosensitive material; and developing means forType: GrantFiled: March 26, 1991Date of Patent: March 24, 1992Assignee: Sharp Kabushiki KaishaInventors: Yoichi Yamamoto, Masao Narumiya
-
Patent number: 5078929Abstract: A process of debinding a ceramic product utilizes a furnace for heating the ceramic product therein in the presence of a surrounding gas so as to remove an organic binder contained in the ceramic product. The ceramic product is continuously heated to an elevated temperature during which the organic binder is decomposed to generate a cracked gas. The process monitors the condition of the cracked gas and controls, depending upon the monitored condition, to vary a temperature gradient at which the ceramic product is heated and at the same time to vary an amount of the surrounding gas being supplied to the furnace in such a manner as to remove the organic binder successfully from within the ceramic product without leaving any unacceptable defect therein.Type: GrantFiled: December 26, 1989Date of Patent: January 7, 1992Assignee: Matsushita Electric Works, Ltd.Inventors: Toshiyuki Matsumae, Yoichi Yamamoto, Isao Fuwa
-
Patent number: 4973989Abstract: A laser beam projecting unit, including a plurality of laser beam generators which are selectively energized according to the level of halftone, and a laser beam combiner for combining the laser beams emitted from the laser beam generator. Moreover, a laser writing apparatus is disclosed which comprises the laser beam projecting unit as mentioned above and a recording medium for receiving the laser beam combined in the laser beam combiner.Type: GrantFiled: June 23, 1989Date of Patent: November 27, 1990Assignee: Sharp Kabushiki KaishaInventor: Yoichi Yamamoto
-
Patent number: 4898489Abstract: A printer system containing an elastic endless sheet member which extends between roller members in front of a print head. The roller members are disposed so as to form a flat surface of the elastic endless sheet member in front of the print head in order to ensure clean printing. One of the roller members is connected to a paper feed motor so that a paper sheet is fed in front of the print head in the vertical direction in unison with the rotation of the elastic endless sheet member around the roller members.Type: GrantFiled: August 23, 1984Date of Patent: February 6, 1990Assignee: Sharp Kabushiki KaishaInventors: Junichiro Matsumoto, Mitsuhiro Shimada, Yoichi Yamamoto
-
Patent number: 4870049Abstract: Disclosed is a heat sensitive sheet which can develop a black image having excellent oil and light resistance, comprising a combination of a record sheet to be printed and a transfer sheet for forming an image on said record sheet, wherein said record sheet is coated with a solution comprising an organic or inorganic nickel compound an an organic and inorganic copper compound and said transfer sheet is coated with dithiooxamide. The present invention also provides a transfer sheet which can form a printed black image having excellent oil and light resistance on any type of record sheets. The transfer sheet is coated with an organic compound having a phenolic hydroxyl group or an amino group directly bonded to aromatic ring and quinone or a quinone derivative substituted by an electron attractive group in such a condition that the organic compound is not reacted with quinone or the quinone derivative.Type: GrantFiled: October 24, 1986Date of Patent: September 26, 1989Assignees: Sharp Kabushiki Kaisha, Sugai Chemical Ind. Co., Ltd.Inventors: Yoichi Yamamoto, Toshio Takehara, Hironori Fujii, Koji Uhara, Hirofumi Tanaka
-
Patent number: 4824822Abstract: A thermosensitive recording method which comprises heat-treating compounds A and B constituting a coloring matter resulting in sublimation or evaporation to thereby bring these two compounds into contact with each other on a recording sheet, resulting in a color image on the recording sheet.Type: GrantFiled: March 28, 1988Date of Patent: April 25, 1989Assignees: Sharp Kabushiki Kaisha, Sugai Chemical Industry Co., Ltd.Inventors: Yoichi Yamamoto, Hironori Fujii, Toshio Oichi
-
Patent number: 4743822Abstract: A servo motor control apparatus for a cutting machine comprises a position feedback loop, a speed feedback loop and a current feedback loop. A current command for the machine is preset to a voltage corresponding to a frictional torque when the motor starts rotation or changes rotating direction, in order to compensate for response lag of motor resulting from frictional torque. The response lag is improved and machining error is reduced by setting a value of a pertinent integral element in the controller comprising an integral element to zero. The sign of such value can be reversed at the moment that the motor operation start command or direction inversion command has changed to positive or negative from zero.Type: GrantFiled: October 10, 1986Date of Patent: May 10, 1988Assignee: Yaskawa Electric Mfg. Co., Ltd.Inventors: Shigeru Futami, Yasuhiko Kaku, Yoichi Yamamoto
-
Patent number: 4626870Abstract: A thermal head comprises a substrate with a folding line, a first thermal resistor dot line formed on a first side of the substrate in a first density of dots, a second thermal resistor dot line formed on a second side of the substrate in a second density of dots different from the first density, and wiring lines for the first and the second thermal resistor dot lines. The substrate is folded along the folding line to form a dihedral angle.Type: GrantFiled: August 6, 1984Date of Patent: December 2, 1986Assignee: Sharp Kabushiki KaishaInventors: Yoichi Yamamoto, Yuichirou Mori
-
Patent number: 4605936Abstract: A thermal head comprises a substrate providing a flat surface and an oblique surface. The oblique surface carries a plurality of thermal resistor elements while the flat surface carries a driving element for driving the thermal resistor elements. The oblique surface is close to the surface of a recording paper positioned on a platen of a recording apparatus. A wiring pattern is provided for connecting the thermal resistor elements and the driving element.Type: GrantFiled: August 6, 1984Date of Patent: August 12, 1986Assignee: Sharp Kabushiki KaishaInventors: Yoichi Yamamoto, Mitsuhiro Shimada
-
Patent number: 4401990Abstract: An ink jet system printer of the charge amplitude controlling type includes a carriage travelling across the printing region. A nozzle for emitting ink droplets and a slidable member are disposed on the carriage. The slidable member supports a charging tunnel and a cleaning pad for cleaning the front surface of the nozzle. When the carriage is positioned at the leftmost position before initiating the actual printing operation, the slidable member is slided on the carriage so that the cleaning pad contacts the front surface of the nozzle for cleaning purposes. Thereafter, the slidable member is held stationary on the carriage at a position wherein the charging tunnel confronts the nozzle.Type: GrantFiled: August 14, 1981Date of Patent: August 30, 1983Assignee: Sharp Kabushiki KaishaInventors: Masahiko Aiba, Yoichi Yamamoto, Hiroji Iwai, Ikuo Umeda
-
Patent number: 4302761Abstract: Plural streams of ink droplets are emitted from a nozzle, each stream comprising uniform size ink droplets. The size of ink droplets of the respective streams is different from each other. Charging electrodes are provided for each of the streams of ink droplets in order to charge the ink droplets included within the respective streams in accordance with a video signal. A selector is provided for allowing the application of the video signal to selected one of the charging electrodes associated with selected one of the streams of ink droplets in response to the size of characters desired to be printed.Type: GrantFiled: August 22, 1979Date of Patent: November 24, 1981Assignee: Sharp Kabushiki KaishaInventor: Yoichi Yamamoto
-
Patent number: 4207582Abstract: An ink liquid supply system for an ink jet system printer of the charge amplitude controlling type is provided with an ink liquid issuance controlling means for terminating the ink liquid issuance from a nozzle. A detection means responsive to input print data signals is provided for terminating the ink liquid issuance from the nozzle when the input print data signals are not introduced for a predetermined time period.Type: GrantFiled: February 6, 1978Date of Patent: June 10, 1980Assignee: Sharp Kabushiki KaishaInventor: Yoichi Yamamoto
-
Patent number: 4190846Abstract: An ink liquid concentration controller is provided in an ink liquid supply system for an ink jet system printer to ensure a stable printing operation. The ink liquid concentration controller functions to maintain the concentration of the ink liquid at a constant value by supplying a volatile dilution to the ink liquid introduced into the ink liquid concentration controller.Type: GrantFiled: December 6, 1977Date of Patent: February 26, 1980Assignee: Sharp Kabushiki KaishaInventors: Yoichi Yamamoto, Yoichi Shimazawa
-
Patent number: 4175266Abstract: A pair of deflection electrodes at least one of which is grooved are provided to confront with each other in an ink jet system printer in order to deflect charged ink droplets emitted from a nozzle as they pass through a high voltage electric field established therebetween. Objectionable ink mist, which is unavoidably formed and diffused in various directions after the ink droplets impinge upon a recording paper or a beam gutter, attached to the grooved deflection electrode gathers and forms an ink drop, which is collected in an indent formed in the grooved deflection electrode. This precludes erroneous breaking down of the system and ensures stability of the high voltage electric field established between the pair of deflection electrodes.Type: GrantFiled: May 7, 1976Date of Patent: November 20, 1979Assignees: Nippon Telegraph and Telephone Public Corporation, Sharp Kabushiki KaishaInventors: Ichizo Nakano, Rikuo Takano, Tamaki Saito, Yuji Sumitomo, Toshio Kobayashi, Yoichi Yamamoto
-
Patent number: 4157551Abstract: In an ink jet system printer of the charge amplitude controlling type, when it is desired to charge a specific ink drop being formed, the amplitude of charge for the specific ink drops is increased in accordance with the total field strength of the electric fields due to the charge amplitude of the preceding ink drops, the charge of the thus increased amplitude being supplied to the specific ink drop to thereby alleviate any charge distortion.Type: GrantFiled: May 10, 1977Date of Patent: June 5, 1979Assignees: Nippon Telegraph and Telephone Public Corporation, Sharp Kabushiki KaishaInventors: Rikuo Takano, Yutaka Ohota, Yoichi Yamamoto, Yuji Sumitomo, Toshio Kobayashi, Masahiko Aiba
-
Patent number: 4115787Abstract: In an ink jet system printer of the charge amplitude controlling type which records character patterns in, for example, a 5 .times. 7 dot matrix pattern, ink droplets not assigned to primary matrix dots are used for interpolation dots which will be deposited between two adjacent primary matrix dots on a record receiving member. The printing quality can be enhanced by provision of these interpolation dots.Type: GrantFiled: August 14, 1975Date of Patent: September 19, 1978Assignees: Nippon Telegraph and Telephone Public Corporation, Sharp Kabushiki KaishaInventors: Isao Fujimoto, Masahiko Aiba, Yoichi Yamamoto, Tomoo Makita
-
Patent number: 4079384Abstract: In an ink liquid supply system for an ink jet system printer, an ink liquid reservoir, an air trap, a pump, an air chamber and an electromagnetic cross valve are made of resin blocks. Conduit means associated with the above-mentioned elements are formed in said resin blocks, whereby the elements are communicated with each other when the resin blocks are fixed to each other.Type: GrantFiled: October 8, 1976Date of Patent: March 14, 1978Assignees: Nippon Telegraph and Telephone Public Corporation, Sharp Kabushiki KaishaInventors: Rikuo Takano, Yuji Sumitomo, Yoichi Yamamoto, Tokio Maezawa