Patents by Inventor Sakai Yokoyama
Sakai Yokoyama 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: 8904639Abstract: Disclosed is a method of including the steps of preparing a substrate having a flow-path-wall member; bonding the flow-path-wall member to a resin layer that is composed of a photo-curing resin and serves as the ejection port member such that spaces serving as the flow paths are provided between the substrate and the photo-curing resin; providing through-holes in the resin layer such that the spaces communicate with the outside air; exposing part of the resin layer to light to form an exposed portion and an unexposed portion; heating the exposed portion of the resin layer; and removing the unexposed portion from the heated resin layer to form the ejection ports, removing the unexposed portion from the heated resin layer to form the ejection ports, thereby forming the ejection port member.Type: GrantFiled: August 31, 2011Date of Patent: December 9, 2014Assignee: Canon Kabushiki KaishaInventors: Keiji Matsumoto, Shuji Koyama, Sakai Yokoyama, Kenji Fujii, Jun Yamamuro
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Patent number: 8491087Abstract: In an ink jet head using a thermal energy for ejecting ink, this invention aims to reliably and uniformly remove kogations deposited on a heat application portion in contact with the ink. To realize this objective, the upper protective layer is arranged in an area including the heat application portion so that it can be electrically connected to serve as an electrode which causes an electrochemical reaction with the ink. The upper protective layer is formed of a material containing a metal which is dissolved by the electrochemical reaction and which does not form, on heating, an oxide film which hinders the dissolution. With this arrangement, a reliable electrochemical reaction can be produced to dissolve a surface layer of the upper protective layer, thereby removing kogations on the heat application portion reliably and uniformly.Type: GrantFiled: January 5, 2012Date of Patent: July 23, 2013Assignee: Canon Kabushiki KaishaInventors: Toshiyasu Sakai, Ichiro Saito, Teruo Ozaki, Sakai Yokoyama, Takahiro Matsui, Takuya Hatsui, Kazuaki Shibata
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Patent number: 8429820Abstract: The present invention is a method of manufacturing a liquid discharge head, which includes providing a substrate on which a solid member is disposed to surround a region that becomes the flow path, and a metal layer made of a metal or a metal compound is disposed inside of the region, forming a mold made of a metal or a metal compound inside of the region, disposing a cover layer made of a resin to cover the solid member and the mold in contact with the solid member and the mold wherein the solid member and the metal are formed with a distance therebetween, and removing the mold to form the flow path.Type: GrantFiled: August 26, 2011Date of Patent: April 30, 2013Assignee: Canon Kabushiki KaishaInventors: Shuji Koyama, Sakai Yokoyama, Kenji Fujii, Jun Yamamuro, Keiji Matsumoto, Tetsuro Honda, Kouji Sasaki, Kenta Furusawa, Keisuke Kishimoto
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Publication number: 20120105537Abstract: In an ink jet head using a thermal energy for ejecting ink, this invention aims to reliably and uniformly remove kogations deposited on a heat application portion in contact with the ink. To realize this objective, the upper protective layer is arranged in an area including the heat application portion so that it can be electrically connected to serve as an electrode which causes an electrochemical reaction with the ink. The upper protective layer is formed of a material containing a metal which is dissolved by the electrochemical reaction and which does not form, on heating, an oxide film which hinders the dissolution. With this arrangement, a reliable electrochemical reaction can be produced to dissolve a surface layer of the upper protective layer, thereby removing kogations on the heat application portion reliably and uniformly.Type: ApplicationFiled: January 5, 2012Publication date: May 3, 2012Applicant: CANON KABUSHIKI KAISHAInventors: TOSHIYASU SAKAI, ICHIRO SAITO, TERUO OZAKI, SAKAI YOKOYAMA, TAKAHIRO MATSUI, TAKUYA HATSUI, KAZUAKI SHIBATA
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Publication number: 20120055022Abstract: The present invention provides a method of producing a liquid ejection head, the method including the steps of preparing a substrate having a flow-path-wall member; bonding the flow-path-wall member to a resin layer that is composed of a photo-curing resin and serves as an ejection port member such that spaces serving as the flow paths are provided inside; providing through-holes in the resin layer such that the spaces communicate with the outside air; exposing part of the resin layer; heating the exposed portion of the resin layer; and removing the unexposed portion from the heated resin layer to form the ejection ports, thereby forming the ejection port member in the resin layer.Type: ApplicationFiled: August 31, 2011Publication date: March 8, 2012Applicant: CANON KABUSHIKI KAISHAInventors: Keiji Matsumoto, Shuji Koyama, Sakai Yokoyama, Kenji Fujii, Jun Yamamuro
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Patent number: 8129204Abstract: Provided is a liquid discharge head substrate including: a substrate; a heating resistor layer formed on the substrate; a flow path for a liquid; a wiring layer stacked on the heating resistor layer and having an end portion which forms a step portion on the heating resistor layer; and a protective layer covering the heating resistor layer and the wiring layer including the step portion, and formed between the heating resistor layer and the flow path, in which the protective layer is formed by a Cat-CVD method.Type: GrantFiled: July 22, 2010Date of Patent: March 6, 2012Assignee: Canon Kabushiki KaishaInventors: Ichiro Saito, Teruo Ozaki, Takahiro Matsui, Sakai Yokoyama, Takuya Hatsui, Kazuaki Shibata
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Publication number: 20120047738Abstract: The present invention is a method of manufacturing a liquid discharge head, which includes providing a substrate on which a solid member that becomes a flow path wall member is disposed to surround a region that becomes a flow path, forming a mold made of a metal or a metal compound inside of the region, disposing a cover layer made of a resin to cover the solid member and the mold, and removing the mold to form the flow path.Type: ApplicationFiled: August 26, 2011Publication date: March 1, 2012Applicant: CANON KABUSHIKI KAISHAInventors: Shuji Koyama, Sakai Yokoyama, Kenji Fujii, Jun Yamamuro, Keiji Matsumoto, Tetsuro Honda, Kouji Sasaki, Kenta Furusawa, Keisuke Kishimoto
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Patent number: 8123330Abstract: In an ink jet head using a thermal energy for ejecting ink, this invention aims to reliably and uniformly remove kogations deposited on a heat application portion in contact with the ink. To realize this objective, the upper protective layer is arranged in an area including the heat application portion so that it can be electrically connected to serve as an electrode which causes an electrochemical reaction with the ink. The upper protective layer is formed of a material containing a metal which is dissolved by the electrochemical reaction and which does not form, on heating, an oxide film which hinders the dissolution. With this arrangement, a reliable electrochemical reaction can be produced to dissolve a surface layer of the upper protective layer, thereby removing kogations on the heat application portion reliably and uniformly.Type: GrantFiled: April 26, 2011Date of Patent: February 28, 2012Assignee: Canon Kabushiki KaishaInventors: Toshiyasu Sakai, Ichiro Saito, Teruo Ozaki, Sakai Yokoyama, Takahiro Matsui, Takuya Hatsui, Kazuaki Shibata
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Patent number: 8079675Abstract: An ink jet recording head includes a substrate provided with an energy generating element to generate energy used for discharging ink, a discharge port through which the ink is discharged, a supply port for supplying the ink, and an ink path formed on the substrate for making the discharge port and the supply port communicate with each other, wherein wall members forming the ink path are made of an inorganic material, and a space between adjacent ink paths is filled up by a metal layer.Type: GrantFiled: November 10, 2010Date of Patent: December 20, 2011Assignee: Canon Kabushiki KaishaInventors: Teruo Ozaki, Ichiro Saito, Kenji Ono, Satoshi Ibe, Toshiyasu Sakai, Sakai Yokoyama, Kazuaki Shibata
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Publication number: 20110199421Abstract: In an ink jet head using a thermal energy for ejecting ink, this invention aims to reliably and uniformly remove kogations deposited on a heat application portion in contact with the ink. To realize this objective, the upper protective layer is arranged in an area including the heat application portion so that it can be electrically connected to serve as an electrode which causes an electrochemical reaction with the ink. The upper protective layer is formed of a material containing a metal which is dissolved by the electrochemical reaction and which does not form, on heating, an oxide film which hinders the dissolution. With this arrangement, a reliable electrochemical reaction can be produced to dissolve a surface layer of the upper protective layer, thereby removing kogations on the heat application portion reliably and uniformly.Type: ApplicationFiled: April 26, 2011Publication date: August 18, 2011Applicant: CANON KABUSHIKI KAISHAInventors: TOSHIYASU SAKAI, ICHIRO SAITO, TERUO OZAKI, SAKAI YOKOYAMA, TAKAHIRO MATSUI, TAKUYA HATSUI, KAZUAKI SHIBATA
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Patent number: 7967421Abstract: The present invention provides an ink jet print head that enables an optimum resistance value to be set for a heating resistor that generates ink ejection energy to allow high-quality images to be printed, as well as a method for manufacturing the ink jet print head. Heating resistors with sheet resistance values differing from each other are formed on the same substrate by heating resistant layers.Type: GrantFiled: December 19, 2007Date of Patent: June 28, 2011Assignee: Canon Kabushiki KaishaInventors: Yuki Kozuka, Yoshinori Misumi, Ichiro Saito, Sakai Yokoyama
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Patent number: 7954238Abstract: An ink jet head circuit board is provided which has heaters to generate thermal energy for ink ejection as they are energized. This circuit board has the heaters formed with high precision to reduce their areas. It also has provisions to protect the electrode wires against corrosion and prevent a progress of corrosion. The substrate is deposited with the thin first electrodes made of a corrosion resistant metal. This is further deposited with the resistor layer. The second electrodes made of aluminum are deposited to overlap the first electrodes to form the heater without causing large dimensional variations among the heaters. With this construction, if a defect should occur in a protective layer on or near the heater, a progress of corrosion can effectively be prevented because the material of the resistor layer is more resistant to encroachment than aluminum and the first electrodes are corrosion resistant.Type: GrantFiled: April 7, 2008Date of Patent: June 7, 2011Assignee: Canon Kabushiki KaishaInventors: Kazuaki Shibata, Kenji Ono, Teruo Ozaki, Satoshi Ibe, Ichiro Saito, Sakai Yokoyama, Toshiyasu Sakai
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Patent number: 7950769Abstract: In an ink jet head using a thermal energy for ejecting ink, this invention aims to reliably and uniformly remove kogations deposited on a heat application portion in contact with the ink. To realize this objective, the upper protective layer is arranged in an area including the heat application portion so that it can be electrically connected to serve as an electrode which causes an electrochemical reaction with the ink. The upper protective layer is formed of a material containing a metal which is dissolved by the electrochemical reaction and which does not form, on heating, an oxide film which hinders the dissolution. With this arrangement, a reliable electrochemical reaction can be produced to dissolve a surface layer of the upper protective layer, thereby removing kogations on the heat application portion reliably and uniformly.Type: GrantFiled: December 5, 2006Date of Patent: May 31, 2011Assignee: Canon Kabushiki KaishaInventors: Toshiyasu Sakai, Ichiro Saito, Teruo Ozaki, Sakai Yokoyama, Takahiro Matsui, Takuya Hatsui, Kazuaki Shibata
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Patent number: 7862155Abstract: An ink jet head circuit board is provided which has heaters to generate thermal energy for ink ejection. This board has the heaters formed with high precision to reduce their areas. It has provisions to protect the electrode wires against corrosion and prevent a progress of corrosion. The substrate is deposited with the thin first electrodes made of a corrosion resistant metal. Over the first electrodes the second electrodes made of aluminum are formed. The second electrodes are deposited with a resistor layer. The heater is formed in the gap between the first electrodes. With this construction, the heaters are formed without large dimensional variations among them. Should a defect occur in a protective layer above or near the heaters, a progress of corrosion can effectively be prevented because the material of the resistor layer is more resistant to encroachment than aluminum and the first electrodes are corrosion resistant.Type: GrantFiled: August 12, 2005Date of Patent: January 4, 2011Assignee: Canon Kabushiki KaishaInventors: Kazuaki Shibata, Sakai Yokoyama, Kenji Ono, Teruo Ozaki, Satoshi Ibe, Ichiro Saito, Toshiyasu Sakai
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Patent number: 7857429Abstract: An ink jet recording head includes a substrate provided with an energy generating element to generate energy used for discharging ink, a discharge port through which the ink is discharged, a supply port for supplying the ink, and an ink path formed on the substrate for making the discharge port and the supply port communicate with each other, wherein wall members forming the ink path are made of an inorganic material, and a space between adjacent ink paths is filled up by a metal layer.Type: GrantFiled: November 17, 2006Date of Patent: December 28, 2010Assignee: Canon Kabushiki KaishaInventors: Teruo Ozaki, Ichiro Saito, Kenji Ono, Satoshi Ibe, Toshiyasu Sakai, Sakai Yokoyama, Kazuaki Shibata
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Publication number: 20100285617Abstract: Provided is a liquid discharge head substrate including: a substrate; a heating resistor layer formed on the substrate; a flow path for a liquid; a wiring layer stacked on the heating resistor layer and having an end portion which forms a step portion on the heating resistor layer; and a protective layer covering the heating resistor layer and the wiring layer including the step portion, and formed between the heating resistor layer and the flow path, in which the protective layer is formed by a Cat-CVD method.Type: ApplicationFiled: July 22, 2010Publication date: November 11, 2010Applicant: CANON KABUSHIKI KAISHAInventors: Ichiro Saito, Teruo Ozaki, Takahiro Matsui, Sakai Yokoyama, Takuya Hatsui, Kazuaki Shibata
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Patent number: 7798595Abstract: A fuse element can be reliably blown and data that corresponds to whether or not the fuse element has been blown can be stored with high reliability. A resistor element is provided in a circuit through which an electric current flows to blow the fuse element in the ink jet printing head. The resistor element adjusts the electric current so that, in the process of blowing the fuse element, the current continues to flow for a predetermined duration even after a maximum current has passed through the fuse element. The predetermined duration is longer than a period from a time point when the electric current rises to a time point when the electric current reaches the maximum current.Type: GrantFiled: October 2, 2008Date of Patent: September 21, 2010Assignee: Canon Kabushiki KaishaInventors: Takuya Hatsui, Teruo Ozaki, Ichiro Saito, Sakai Yokoyama, Kazuaki Shibata, Takahiro Matsui
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Patent number: 7712875Abstract: For providing a base for a liquid discharge head having an internal surface of a liquid flow path and a discharge port, suppressed in swelling by liquid and having high precision and high reliability, the base including a base member, an energy generating element for discharging a liquid, formed on the base member, and a resin structure having a liquid discharge port for discharging the liquid and disposed on the base member so as to cover the energy generating element, is provided with a protective layer. The protective layer is formed by a catalytic chemical vapor deposition on a surface of the resin structure in which the liquid discharge port is opened.Type: GrantFiled: June 27, 2007Date of Patent: May 11, 2010Assignee: Canon Kabushiki KaishaInventors: Kazuaki Shibata, Takahiro Matsui, Ichiro Saito, Takuya Hatsui, Sakai Yokoyama, Teruo Ozaki
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Publication number: 20100079551Abstract: The invention provides a substrate for a liquid discharge head having a heat generating resistor layer, wiring electrically in contact with the heat generating resistor layer, an insulating protection layer that covers the heat generating resistor layer and the wiring, and a liquid passage that are formed in order on an insulating layer formed on a base plate. The insulating protection layer being a layer formed by radical shower CVD.Type: ApplicationFiled: May 23, 2008Publication date: April 1, 2010Applicant: CANON KABUSHIKI KAISHAInventors: Ichiro Saito, Kazuaki Shibata, Takahiro Matsui, Sakai Yokoyama, Teruo Ozaki
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Patent number: 7681993Abstract: An ink jet head circuit board is provided which has heaters to generate thermal energy for ejecting ink as they are energized. This circuit board is so constructed as to reduce wire resistances for the heaters while at the same time preventing an increase in the size of the board and realizing a high-density integration of the heaters required for high resolution printing. This construction is made possible by forming electrode wires of first and second electrode wire layers to reduce an area that the wire patterns for the heater occupy on the circuit board. In reducing the effective thickness of protective insulation layer formed on the heater to prevent a possible degradation of thermal efficiency, one of the protective insulation layers over the electrode wires is removed from the heater, depending on the thickness of the electrode wires.Type: GrantFiled: August 15, 2005Date of Patent: March 23, 2010Assignee: Canon Kabushiki KaishaInventors: Kenji Ono, Teruo Ozaki, Toshiyasu Sakai, Ichiro Saito, Satoshi Ibe, Sakai Yokoyama, Kazuaki Shibata