Patents by Inventor Yasumitsu Yokoyama
Yasumitsu 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: 7444933Abstract: A stencil printer of the present invention perforates, or cuts, a thermosensitive stencil with a thermal head to thereby make a master. The stencil printer includes a stencil distinguishing device for automatically identifying the kind of the stencil or a master setting device for allowing the operator of the printer to set the kind of the stencil. An adjusting device selects, among master making conditions experimentally determined beforehand, a master making condition matching with information output from the stencil distinguishing device or the stencil setting device. The operator can easily change the master making condition in accordance with the kind of a stencil to use.Type: GrantFiled: July 26, 2004Date of Patent: November 4, 2008Assignee: Tohoku Ricoh Co., Ltd.Inventors: Yasunobu Kidoura, Yoshiyuki Shishido, Yasumitsu Yokoyama, Satoshi Katoh
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Publication number: 20050000375Abstract: A stencil printer of the present invention perforates, or cuts, a thermosensitive stencil with a thermal head to thereby make a master. The stencil printer includes a stencil distinguishing device for automatically identifying the kind of the stencil or a master setting device for allowing the operator of the printer to set the kind of the stencil. An adjusting device selects, among master making conditions experimentally determined beforehand, a master making condition matching with information output from the stencil distinguishing device or the stencil setting device. The operator can easily change the master making condition in accordance with the kind of a stencil to use.Type: ApplicationFiled: July 26, 2004Publication date: January 6, 2005Inventors: Yasunobu Kidoura, Yoshiyuki Shishido, Yasumitsu Yokoyama, Satoshi Katoh
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Patent number: 6836276Abstract: A thermal master making device and a thermal printer including the same are disclosed. A thermistor senses ambient temperature around a thermal head. A correcting device corrects the amount of heat to be generated by the thermal head, i.e., the duration of energization at least two times during a single master making operation. This configuration reduces a change in the perforation conditions of a thermosensitive medium ascribable to the heat accumulation characteristic of the head. The printer achieves high resolution, high-speed master making and space saving.Type: GrantFiled: August 29, 2003Date of Patent: December 28, 2004Assignee: Tohoku Ricoh Co., Ltd.Inventors: Yasunobu Kidoura, Satoshi Katoh, Yasumitsu Yokoyama, Yoshiyuki Shishido
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Patent number: 6786146Abstract: A stencil printer of the present invention perforates, or cuts, a thermosensitive stencil with a thermal head to thereby make a master. The stencil printer includes a stencil distinguishing device for automatically identifying the kind of the stencil or a master setting device for allowing the operator of the printer to set the kind of the stencil. An adjusting device selects, among master making conditions experimentally determined beforehand, a master making condition matching with information output from the stencil distinguishing device or the stencil setting device. The operator can easily change the master making condition in accordance with the kind of a stencil to use.Type: GrantFiled: November 8, 2001Date of Patent: September 7, 2004Assignee: Tohoku Ricoh Co., Ltd.Inventors: Yasunobu Kidoura, Yoshiyuki Shishido, Yasumitsu Yokoyama, Satoshi Katoh
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Patent number: 6747682Abstract: A thermal master making device and a thermal printer including the same are disclosed. A thermistor senses ambient temperature around a thermal head. A correcting device corrects the amount of heat to be generated by the thermal head, i.e., the duration of energization at least two times during a single master making operation. This configuration reduces a change in the perforation conditions of a thermosensitive medium ascribable to the heat accumulation characteristic of the head. The printer achieves high resolution, high-speed master making and space saving.Type: GrantFiled: February 2, 2001Date of Patent: June 8, 2004Assignee: Tohoku Ricoh Co., Ltd.Inventors: Yasunobu Kidoura, Satoshi Katoh, Yasumitsu Yokoyama, Yoshiyuki Shishido
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Publication number: 20040041899Abstract: A thermal master making device and a thermal printer including the same are disclosed. A thermistor senses ambient temperature around a thermal head. A correcting device corrects the amount of heat to be generated by the thermal head, i.e., the duration of energization at least two times during a single master making operation. This configuration reduces a change in the perforation conditions of a thermosensitive medium ascribable to the heat accumulation characteristic of the head. The printer achieves high resolution, high-speed master making and space saving.Type: ApplicationFiled: August 29, 2003Publication date: March 4, 2004Applicant: Tohoku Ricoh Co., LtdInventors: Yasunobu Kidoura, Satoshi Katoh, Yasumitsu Yokoyama, Yashiyuki Shishido
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Patent number: 6664992Abstract: A master making device includes a thermal head with heat generating elements and a platen roller. While the head and platen roller convey a thermosensitive medium in a subscanning direction perpendicular to a main scanning direction, the heat generating elements selectively generate heat in order to perforate the medium in accordance with an image signal. The head includes a stepped portion formed at a medium outlet side in the subscanning direction. The edges of the heat generating elements adjoining the medium outside side are located at a distance of 0.018 mm to 0.5 mm from the end of the stepped portion adjoining the above edges. It is not necessary to position the head with respect to an effective nip between it and the platen roller by a troublesome procedure. Further, the distance over which the perforated medium is conveyed is reduced to obviate the reduction or contraction of an image ascribable to the sticking of the medium to the head.Type: GrantFiled: March 17, 2000Date of Patent: December 16, 2003Assignee: Tohoku Ricoh Co., Ltd.Inventors: Yasumitsu Yokoyama, Yasunobu Kidoura, Satoshi Katoh, Yoshiyuki Shishido
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Publication number: 20020053291Abstract: A stencil printer of the present invention perforates, or cuts, a thermosensitive stencil with a thermal head to thereby make a master. The stencil printer includes a stencil distinguishing device for automatically identifying the kind of the stencil or a master setting device for allowing the operator of the printer to set the kind of the stencil. An adjusting device selects, among master making conditions experimentally determined beforehand, a master making condition matching with information output from the stencil distinguishing device or the stencil setting device. The operator can easily change the master making condition in accordance with the kind of a stencil to use.Type: ApplicationFiled: November 8, 2001Publication date: May 9, 2002Applicant: Tohoku Ricoh Co., Ltd.Inventors: Yasunobu Kidoura, Yoshiyuki Shishido, Yasumitsu Yokoyama, Satoshi Katoh
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Publication number: 20010028384Abstract: A thermal master making device and a thermal printer including the same are disclosed. A thermistor senses ambient temperature around a thermal head. A correcting device corrects the amount of heat to be generated by the thermal head, i.e., the duration of energization at least two times during a single master making operation. This configuration reduces a change in the perforation conditions of a thermosensitive medium ascribable to the heat accumulation characteristic of the head. The printer achieves high resolution, high-speed master making and space saving.Type: ApplicationFiled: February 2, 2001Publication date: October 11, 2001Applicant: Tohoku Ricoh Co., Ltd.Inventors: Yasunobu Kidoura, Satoshi Katoh, Yasumitsu Yokoyama, Yoshiyuki Shishido
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Patent number: 6130697Abstract: A thermal master making device includes a thermal head having a plurality of heating elements arranged in an array in the main scanning direction. The thermal head is caused to contact a stencil including a thermoplastic resin film. While the master is fed at a preselected feed pitch in the subscanning direction perpendicular to the main scanning direction, the heating elements selectively heat and perforate the film of the stencil in accordance with image data to thereby form an image in the stencil in the form of a dot pattern. A pitch at which the heating elements are arranged and the feed pitch are substantially equal to each other. The heating elements each have a length in the subscanning direction smaller than one-half of the feed pitch inclusive and have a length in the main scanning direction greater than the length in the subscanning direction. The device is capable of stably forming desired perforations in the stencil and extending the life of the heating element and therefore the life of the head.Type: GrantFiled: March 22, 1999Date of Patent: October 10, 2000Assignee: Tohoku Ricoh Co., Ltd.Inventors: Yasumitsu Yokoyama, Yoshiyuki Shishido, Satoshi Katoh, Yasunobu Kidoura
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Patent number: 6050184Abstract: A thermal master making device and a thermal recording device each including a thermal head and a platen roller. The master making device thermally perforates, or cuts, a thermosensitive stencil for making a master while the recording device thermally records an image on a thermosensitive recording medium. The devices each reduce the corrosion of an expensive thermal head in any environmental conditions while guaranteeing the conveyance of the stencil or the recording medium. The stencil and recording medium each contain a corrosive substance in an antistatic agent or adhesive or an overcoat layer thereof. The corrosion of the head would directly translate into defective images. With the above devices, it is possible to reduce a burden on the user and to extend the life of the head. Extending the life of the head is desirable from the environmental standpoint also.Type: GrantFiled: December 8, 1997Date of Patent: April 18, 2000Assignee: Tohoku Ricoh Co., Ltd.Inventors: Yasunobu Kidoura, Satoshi Katoh, Yoshiyuki Shishido, Yasumitsu Yokoyama
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Patent number: 5809879Abstract: A control device for a thermosensitive stencil printer capable of perforating a stencil in an optimal configuration matching a desired resolution in the subscanning direction and thereby producing desirable images. The device allows perforations to be formed in a stencil in an adequate size in the subscanning direction. Heating portions included in a thermal head are each sized, in the subscanning direction, smaller than a feed pitch corresponding to the highest resolution available with a resolution setting device.Type: GrantFiled: November 27, 1995Date of Patent: September 22, 1998Assignee: Tohoku Ricoh Co., Ltd.Inventors: Yasumitsu Yokoyama, Yoshiyuki Shishido, Satoshi Katoh
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Patent number: 5685222Abstract: A control device for a thermosensitive stencil printer which is capable of perforating a stencil in an optimal configuration matching a desired resolution in the subscanning direction and thereby producing desirable images. The device allows perforations to be formed in a stencil in an adequate size in the subscanning direction. Heating portions included in a thermal head are each sized, in the subscanning direction, smaller than a feed pitch corresponding to the highest resolution available with a resolution setting device.Type: GrantFiled: March 2, 1995Date of Patent: November 11, 1997Assignee: Tohoku Ricoh Co., Ltd.Inventors: Yasumitsu Yokoyama, Yoshiyuki Shishido, Satoshi Katoh
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Patent number: 5216951Abstract: A thermal plate making apparatus including a thermal head having a plurality of heating elements arranged in a line. Each element has a shape having substantially four corners. And a protruding portion for enhancing heat generation is formed at each of at least two diagonal corners of the element.Type: GrantFiled: October 29, 1992Date of Patent: June 8, 1993Assignee: Ricoh Company, Ltd.Inventors: Yasumitsu Yokoyama, Mitsuo Sato