Patents by Inventor Fumio Murooka
Fumio Murooka 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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Patent number: 7350891Abstract: The liquid discharge head has a heater resistor for heating liquid in a liquid route communicating with a discharge port and generating bubbles and a switch circuit for switching on/off the current to be supplied to the heater resistor. One end of the heater resistor is connected to a power-supply potential, one end of the switch circuit is connected to a ground potential, and the other end of the heater resistor and the other end of the switch circuit are connected to each other. The liquid discharge head has a detection circuit for detecting the voltage of the connection point between the heater resistor and the switch circuit and outputting an output signal when a predetermined change occurs in the voltage, and a switch control circuit for controlling the switching on/off of the switch circuit in accordance with the output signal.Type: GrantFiled: April 25, 2005Date of Patent: April 1, 2008Assignee: Canon Kabushiki KaishaInventors: Masanobu Oomura, Fumio Murooka
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Patent number: 7250113Abstract: A method for manufacturing a liquid ejection head having a substrate including an electro-thermal transducer for ejecting a liquid from an ejection opening, an electrode wiring section electrically connecting the electro-thermal transducer and driver element thereof, and a liquid supply port therethrough includes the steps of forming a sacrificial layer by using the same material as the electrode wiring section at a position at which the liquid supply port is to be formed during forming the electrode wiring section, forming an anti-etching layer covering the sacrificial layer, removing the sacrificial layer by etching the substrate from a surface thereof opposite to the surface on which the electro-thermal transducer is formed to expose the anti-etching layer of a portion to be the liquid supply port, and removing the exposed anti-etching layer to form the liquid supply port in the substrate.Type: GrantFiled: June 17, 2004Date of Patent: July 31, 2007Assignee: Canon Kabushiki KaishaInventors: Hirokazu Komuro, Fumio Murooka
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Publication number: 20050237353Abstract: To provide a liquid discharge head capable of improving the durability and stability of a heating resistor and a liquid discharge head in its turn without making the shape of the region of the heating resistor complex. The liquid discharge head has a heater resistor RH for heating the liquid in a liquid route (not illustrated) communicating with a discharge port (not illustrated) and generating bubbles and a switch circuit SW for switching on/off of the current to be supplied to a heater resistor RH. One end of the heater resistor RH is connected to a power-supply potential VH, one end of the switch circuit SW is connected to a ground potential GNDH and the other end of the heater resistor RH and the other end of the switch circuit SW are mutually connected.Type: ApplicationFiled: April 25, 2005Publication date: October 27, 2005Applicant: CANON KABUSHIKI KAISHAInventors: Masanobu Oomura, Fumio Murooka
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Publication number: 20040259372Abstract: A method for manufacturing a liquid ejection head having a substrate including an electro-thermal transducer for ejecting a liquid from an ejection opening, an electrode wiring section electrically connecting the electro-thermal transducer and driver element thereof, and a liquid supply port therethrough includes the steps of forming a sacrificial layer by using the same material as the electrode wiring section at a position at which the liquid supply port is to be formed during forming the electrode wiring section, forming an anti-etching layer covering the sacrificial layer, removing the sacrificial layer by etching the substrate from a surface thereof opposite to the surface on which the electro-thermal transducer is formed to expose the anti-etching layer of a portion to be the liquid supply port, and removing the exposed anti-etching layer to form the liquid supply port in the substrate.Type: ApplicationFiled: June 17, 2004Publication date: December 23, 2004Applicant: Canon Kabushiki KaishaInventors: Hirokazu Komuro, Fumio Murooka
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Patent number: 6520611Abstract: In a print head of this invention, electricity-to-heat converters and a driver circuit for driving these electricity-to-heat converters in accordance with print data are formed on a single board. The board further includes an input/output interface circuit for receiving print data from an external apparatus, a CPU for controlling a printer apparatus, a ROM, a RAM, an A/D converter, a D/A converter, a timer, and the like, and also includes an external element driver for driving a mechanism portion of the printer apparatus.Type: GrantFiled: January 12, 2001Date of Patent: February 18, 2003Assignee: Canon Kabushiki KaishaInventors: Hiroyuki Ishinaga, Junji Shimoda, Fumio Murooka, Tatsuo Furukawa, Hiroyuki Maru, Masaaki Izumida, Yoshinori Misumi
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Patent number: 6471339Abstract: This invention has as its object to provide a substrate for an ink jet recording head, which is compact and can realize stable recording with high reliability, a recording head using the substrate, a recording apparatus mounting the recording head, and a method of driving the recording head. There are disclosed a substrate for a thermal recording head, having a plurality of heating resistor elements, a plurality of wiring electrodes for supplying driving signals to the heating resistor elements, a function element, electrically connected to the heating resistor elements, for selectively driving the plurality of heating resistor elements, and a measurement resistor element which is electrically independent form the heating resistor elements and the function element, and haws a resistance value larger than that of each heating resistor element, an ink jet head, a head cartridge, and a recording apparatus utilizing the substrate, and a method of driving a recording head using a measurement resistor.Type: GrantFiled: September 7, 2000Date of Patent: October 29, 2002Assignee: Canon Kabushiki KaishaInventors: Yuji Kamiyama, Fumio Murooka, Tatsuo Furukawa, Shuichi Katao, Yoshiyuki Imanaka, Hiroyuki Maru, Masaaki Izumida
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Patent number: 6467884Abstract: To provide a substrate unit for liquid discharging head, a method for producing the same, a liquid discharging head, a cartridge, and an image forming apparatus. The substrate unit for liquid discharging head is for a head which gives thermal energy to the liquid for film boiling, to discharge droplets of the liquid from its discharge port.Type: GrantFiled: August 23, 2000Date of Patent: October 22, 2002Assignee: Canon Kabushiki KaishaInventors: Fumio Murooka, Kei Fujita, Yukihiro Hayakawa, Makoto Terui
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Patent number: 6464320Abstract: A recording head records data by correcting a variation among recording elements without significantly increasing a size of a substrate of the recording head. The recording head includes a plurality of heat generating elements and a circuit for energizing the heat generating elements in accordance with record data to record data. Selection information for selecting one of a plurality of pre-heat pulse signals is non-volatilly stored in a ROM and one of the pre-heat signal pulses applied to an input terminal is selected in accordance with the selection information stored in the ROM to pre-heat the heat generating elements.Type: GrantFiled: August 29, 2000Date of Patent: October 15, 2002Assignee: Canon Kabushiki KaishaInventors: Hiroyuki Maru, Masami Kasamoto, Fumio Murooka, Yoshiyuki Imanaka, Masaaki Izumida
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Patent number: 6439690Abstract: An ink jet head includes a plurality of liquid flow paths for ejecting the ink; and a plurality of heat generating resistors for the respective liquid flow paths, the heat generating resistor being independently drivable; wherein adjacent ones of the heat generating resistors are spaced by not more than 8 microns.Type: GrantFiled: June 20, 2001Date of Patent: August 27, 2002Assignee: Canon Kabushiki KaishaInventors: Hiroyuki Ishinaga, Kazuaki Masuda, Junji Shimoda, Masami Kasamoto, Fumio Murooka, Tatsuo Furukawa, Jun Kawai, Hiroyuki Maru, Teruo Arashima, Masaaki Izumida, Yoshinori Misumi, Yuji Kamiyama
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Publication number: 20010033304Abstract: An ink jet head includes a plurality of liquid flow paths for ejecting the ink; and a plurality of heat generating resistors for the respective liquid flow paths, the heat generating resistor being independently drivable; wherein adjacent ones of the heat generating resistors are spaced by not more than 8 microns.Type: ApplicationFiled: June 20, 2001Publication date: October 25, 2001Inventors: Hiroyuki Ishinaga, Kazuaki Masuda, Junji Shimoda, Masami Kasamoto, Fumio Murooka, Tatsuo Furukawa, Jun Kawai, Hiroyuki Maru, Teruo Arashima, Masaaki Izumida, Yoshinori Misumi, Yuji Kamiyama
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Patent number: 6257695Abstract: This invention has as its object to provide a substrate for an ink jet recording head, which is compact and can realize stable recording with high reliability, a recording head using the substrate, a recording apparatus mounting the recording head, and a method of driving the recording head. There are disclosed a substrate for a thermal recording head, having a plurality of heating resistor elements, a plurality of wiring electrodes for supplying driving signals to the heating resistor elements, a function element, electrically connected to the heating resistor elements, for selectively driving the plurality of heating resistor elements, and a measurement resistor element which is electrically independent form the heating resistor elements and the function element, and haws a resistance value larger than that of each heating resistor element, an ink jet head, a head cartridge, and a recording apparatus utilizing the substrate, and a method of driving a recording head using a measurement resistor.Type: GrantFiled: July 9, 1999Date of Patent: July 10, 2001Assignee: Canon Kabushiki KaishaInventors: Yuji Kamiyama, Fumio Murooka, Tatsuo Furukawa, Shuichi Katao, Yoshiyuki Imanaka, Hiroyuki Maru, Masaaki Izumida
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Patent number: 6243109Abstract: In a print head of this invention, electricity-to-heat converters and a driver circuit for driving these electricity-to-heat converters in accordance with print data are formed on a single board. The board further includes an input/output interface circuit for receiving print data from an external apparatus, a CPU for controlling a printer apparatus, a ROM, a RAM, an A/D converter, a D/A converter, a timer, and the like, and also includes an external element driver for driving a mechanism portion of the printer apparatus.Type: GrantFiled: December 22, 1997Date of Patent: June 5, 2001Assignee: Canon Kabushiki KaishaInventors: Hiroyuki Ishinaga, Junji Shimoda, Fumio Murooka, Tatsuo Furukawa, Hiroyuki Maru, Masaaki Izumida, Yoshinori Misumi
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Publication number: 20010001558Abstract: In a print head of this invention, electricity-to-heat converters and a driver circuit for driving these electricity-to-heat converters in accordance with print data are formed on a single board. The board further includes an input/output interface circuit for receiving print data from an external apparatus, a CPU for controlling a printer apparatus, a ROM, a RAM, an A/D converter, a D/A converter, a timer, and the like, and also includes an external element driver for driving a mechanism portion of the printer apparatus.Type: ApplicationFiled: January 12, 2001Publication date: May 24, 2001Inventors: Hiroyuki Ishinaga, Junji Shimoda, Fumio Murooka, Tatsuo Furukawa, Hiroyuki Maru, Masaaki Izumida, Yoshinori Misumi
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Patent number: 6224195Abstract: A recording head records data by correcting a variation among recording elements without significantly increasing a size of a substrate of the recording head. The recording head includes a plurality of heat generating elements and a circuit for energizing the heat generating elements in accordance with record data to record data. Selection information for selecting one of a plurality of pre-heat pulse signals is non-volatilly stored in a ROM and one of the pre-heat signal pulses applied to an input terminal is selected in accordance with the selection information stored in the ROM to pre-heat the heat generating elements.Type: GrantFiled: January 23, 1996Date of Patent: May 1, 2001Assignee: Canon Kabushiki KaishaInventors: Hiroyuki Maru, Masami Kasamoto, Fumio Murooka, Yoshiyuki Imanaka, Masaaki Izumida
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Patent number: 5943070Abstract: This invention has as its object to provide a substrate for an ink jet recording head, which is compact and can realize stable recording with high reliability, a recording head using the substrate, a recording apparatus mounting the recording head, and a method of driving the recording head.There are disclosed a substrate for a thermal recording head, having a plurality of heating resistor elements, a plurality of wiring electrodes for supplying driving signals to the heating resistor elements, a function element, electrically connected to the heating resistor elements, for selectively driving the plurality of heating resistor elements, and a measurement resistor element which is electrically independent from the heating resistor elements and the function element, and has a resistance value larger than that of each heating resistor element, an ink jet head, a head cartridge, and a recording apparatus utilizing the substrate, and a method of driving a recording head using a measurement resistor.Type: GrantFiled: September 2, 1994Date of Patent: August 24, 1999Assignee: Canon Kabushiki KaishaInventors: Yuji Kamiyama, Fumio Murooka, Tatsuo Furukawa, Shuichi Katao, Yoshiyuki Imanaka, Hiroyuki Maru, Masaaki Izumida
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Patent number: 5880762Abstract: An ink jet head includes a plurality of liquid flow paths for ejecting the ink; and a plurality of heat generating resistors for the respective liquid flow paths, the heat generating resistor being independently drivable; wherein adjacent ones of the heat generating resistors are spaced by not more than 8 microns.Type: GrantFiled: October 15, 1997Date of Patent: March 9, 1999Assignee: Canon Kabushiki KaishaInventors: Hiroyuki Ishinaga, Kazuaki Masuda, Junji Shimoda, Masami Kasamoto, Fumio Murooka, Tatsuo Furukawa, Jun Kawai, Hiroyuki Maru, Teruo Arashima, Masaaki Izumida, Yoshinori Misumi, Yuji Kamiyama
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Patent number: 5877784Abstract: A downsized, low-cost, high-density printhead, a printing apparatus and a printing method using the printhead can be achieved. If the number of electrothermal transducers is N, a shift register is capable of storing print information corresponding to N/8 electrothermal transducers. First, print information corresponding to the capacity of the shift register is transferred to the printhead. Then, the shifting function of the shift register is stopped to hold the print information. A 3-bit selection signal is inputted from an input terminal as the print information information. The selection signal is sent to a time-divisional logical circuit, then N/8 electrothermal transducers are selected, and a printing operation based on the input data is performed. This operation is repeated eight times, to complete printing by all the N electrothermal transducers.Type: GrantFiled: June 30, 1995Date of Patent: March 2, 1999Assignee: Canon Kabushiki KaishaInventors: Hiroyuki Maru, Junji Shimoda, Fumio Murooka, Tatsuo Furukawa, Hiroyuki Ishinaga, Masaaki Izumida, Yoshinori Misumi
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Patent number: 5731828Abstract: An ink jet head includes a plurality of liquid flow paths for ejecting the ink; and a plurality of heat generating resistors for the respective liquid flow paths, the heat generating resistor being independently drivable; wherein adjacent ones of the heat generating resistors are spaced by not more than 8 microns.Type: GrantFiled: October 20, 1995Date of Patent: March 24, 1998Assignee: Canon Kabushiki KaishaInventors: Hiroyuki Ishinaga, Kazuaki Masuda, Junji Shimoda, Masami Kasamoto, Fumio Murooka, Tatsuo Furukawa, Jun Kawai, Hiroyuki Maru, Teruo Arashima, Masaaki Izumida, Yoshinori Misumi, Yuji Kamiyama
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Patent number: 5614439Abstract: A semiconductor device with a high-density wiring structure, and a producing method for such device are provided. The semiconductor device has a substrate such as silicon, an insulation layer laminated on the substrate and having a groove or a hole, and a wiring of a conductive material formed in the groove or hole in the insulation layer. The wiring is formed by depositing a conductive material such as aluminum or an aluminum alloy in the groove or hole of the insulation layer by a CVD method utilizing alkylaluminum hydride gas and hydrogen. The groove or hole can be formed by an ordinary patterning method combined with etching.Type: GrantFiled: February 21, 1995Date of Patent: March 25, 1997Assignee: Canon Kabushiki KaishaInventors: Fumio Murooka, Tetsuo Asaba, Shigeyuki Matsumoto, Osamu Ikeda, Toshihiko Ichise, Yukihiko Sakashita, Shunsuke Inoue
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Patent number: 5602576Abstract: A recording head comprises a liquid emission member having an orifice through which an ink is emitted, an electro-thermal converter element for generating a thermal energy which is utilized to emit the ink introduced into the liquid emission member, and a functional element disposed on a same substrate on which the electro-thermal converter element is disposed for driving and controlling the electro-thermal converter element.The functional element includes an NPN bipolar transistor for driving the electrothermal converter element and a CMOS transistor composed of an NMOS transistor and a PMOS transisfor for controlling an operation of the bipolar transistor.The NMOS transistor being formed in a P well diffusion layer in an N.sup.- type epitaxial growth layer which is grown on a surface of a P type semiconductor substrate.The PMOS transistor being formed in an N well diffusion layer in the N.sup.- type epitaxial growth layer which is grown on the surface of the P type semiconductor substrate.Type: GrantFiled: April 15, 1996Date of Patent: February 11, 1997Assignee: Canon Kabushiki KaishaInventors: Fumio Murooka, Junji Shimoda, Tatsuo Furukawa, Hiroyuki Ishinaga, Hiroyuki Maru, Masaaki Izumida, Yoshinori Misumi