Patents by Inventor Akira Mutoh
Akira Mutoh 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: 6548228Abstract: After a silicon wafer is held horizontally such that a surface thereof coated with a photoresist faces upwardly, the surface of the silicon wafer is supplied with a cleaning liquid to form a puddle thereof before a developing liquid is supplied. After the puddle of the cleaning liquid is formed, the silicon wafer starts to be rotated and the developing liquid starts to be supplied to the surface of the silicon wafer. The developing liquid is supplied to the surface of the silicon wafer with the puddle of the cleaning liquid being formed thereon. Alternatively, developing liquid is supplied to the surface of the silicon wafer which is being supplied with cleaning liquid while the silicon wafer is being rotated.Type: GrantFiled: January 29, 2001Date of Patent: April 15, 2003Assignee: NEC CorporationInventor: Akira Mutoh
-
Patent number: 6379057Abstract: A developing process for obtaining a resist pattern on a semiconductor wafer includes puddling a developer on a wafer and holding a wafer inclined at a predetermined tilt angle in the puddled condition and repeating alternately stoppage and slow rotation plural times. This can make the central pattern width narrower selectively simply by apparatus adjustment, in case where, otherwise the pattern width of a wafer's central portion becomes wide, thereby achieving an increased pattern uniformity of the wafer and serve as improving the performances.Type: GrantFiled: June 2, 2000Date of Patent: April 30, 2002Assignee: NEC CorporationInventor: Akira Mutoh
-
Patent number: 6373815Abstract: In an optical disc, an ID field contains a plurality of address information, and is preliminarily recorded in convex and concave signals, and is composed of two sets offset by about ½ track pitch toward the internal or external track direction adjacent to the guide track, an information recording field is composed of grooves and lands oscillating at a single frequency in the radial direction, and the grooves and lands alternate in every revolution of the guide track. When w bits of information are included in one period of oscillation, an information unrecorded field between the ID field and information recording field is arranged to have a length of w/10 bits or more and/or w bits or less, and therefore, when recording continuous information data such as video data, it is possible to record continuously by generating a clock securely from the oscillating signal, and moreover, the format efficiency is improved, so that a format of a larger capacity is achieved.Type: GrantFiled: September 21, 1999Date of Patent: April 16, 2002Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Takashi Ishida, Shin-ichi Tanaka, Akira Mutoh, Yoshinari Takemura, Shunji Ohara, Isao Satoh
-
Publication number: 20010018167Abstract: After a silicon wafer is held horizontally such that a surface thereof coated with a photoresist faces upwardly, the surface of the silicon wafer is supplied with a cleaning liquid to form a puddle thereof before a developing liquid is supplied. After the puddle of the cleaning liquid is formed, the silicon wafer starts to be rotated and the developing liquid starts to be supplied to the surface of the silicon wafer. The developing liquid is supplied to the surface of the silicon wafer with the puddle of the cleaning liquid being formed thereon. Alternatively, developing liquid is supplied to the surface of the silicon wafer which is being supplied with cleaning liquid while the silicon wafer is being rotated.Type: ApplicationFiled: January 29, 2001Publication date: August 30, 2001Applicant: NEC CorporationInventor: Akira Mutoh
-
Patent number: 6207352Abstract: A developing process for obtaining a resist pattern on a semiconductor wafer includes puddling a developer on a wafer and holding a wafer inclined at a predetermined tilt angle in the puddled condition and repeating alternately stoppage and slow rotation plural times. This can make the central pattern width narrower selectively simply by apparatus adjustment, in case where, otherwise the pattern width of a wafer's central portion becomes wide, thereby achieving an increased pattern uniformity of the wafer and serve as improving the performances.Type: GrantFiled: July 31, 1998Date of Patent: March 27, 2001Assignee: NEC CorporationInventor: Akira Mutoh
-
Patent number: 6167022Abstract: One or more optical discs, each having a ROM field having information with a length of at least one track formed in convex and concave pit rows, and a rewritable field capable of rewriting the information with a length of at least one track, an information unrecorded field having a length of at least one track located between the ROM field and rewritable field, the rewritable field having a spiral or concentric guide track oscillating in a radial direction, the ROM field having spiral or concentric convex and concave pit rows, and at least a part field at the rewritable field side of the information unrecorded field has a transition field having a spiral or concentric guide track oscillating in the radial direction continuously or intermittently and a track pitch To of the ROM field and a track pitch Tw between grooves and lands of the rewritable field have values such that To>Tw.Type: GrantFiled: September 21, 1999Date of Patent: December 26, 2000Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Takashi Ishida, Shin-ichi Tanaka, Akira Mutoh, Yoshinari Takemura, Shunji Ohara, Isao Satoh
-
Patent number: 6137768Abstract: In an optical disc, an ID field contains a plurality of address information, and is preliminarily recorded in convex and concave signals, and is composed of two sets offset by about 1/2 track pitch toward the internal or external track direction adjacent to the guide track, an information recording field is composed of grooves and lands oscillating at a single frequency in the radial direction, and the grooves and lands alternate in every revolution of the guide track. When w bits of information are included in one period of oscillation, an information unrecorded field between the ID field and information recording field is arranged to have a length of w/10 bits or more and/or w bits or less, and therefore, when recording continuous information data such as video data, it is possible to record continuously by generating a clock securely from the oscillating signal, and moreover, the format efficiency is improved, so that a format of a larger capacity is achieved.Type: GrantFiled: October 27, 1997Date of Patent: October 24, 2000Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Takashi Ishida, Shin-ichi Tanaka, Akira Mutoh, Yoshinari Takemura, Shunji Ohara, Isao Satoh
-
Patent number: 5898394Abstract: A code conversion method and apparatus is provided for scrambling and modulating data. The method and apparatus includes scrambling an input main data unit based on any of plural types of pseudo-random number sequences, and modulating the scrambled main data unit based on any of plural types of modulation data. An output main data unit is produced from the modulated main data unit, and a calculated value representing a difference between a number of 0 bits and a number of 1 bits included in the output main data unit is obtained. Any of the modulation data is then selected dependent upon the calculated value.Type: GrantFiled: July 25, 1997Date of Patent: April 27, 1999Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Yoshiharu Kobayashi, Akira Mutoh, Shin-ichi Tanaka, Nobuo Akahira
-
Patent number: RE39771Abstract: A code conversion method and apparatus is provided for scrambling and modulating data. The method and apparatus includes scrambling an input main data unit based on any of plural types of pseudo-random number sequences, and modulating the scrambled main data unit based on any of plural types of modulation data. An output main data unit is produced from the modulated main data unit, and a calculated value representing a difference between a number of 0 bits and a number of 1 bits included in the output main data unit is obtained. Any of the modulation data is then selected dependent upon the calculated value.Type: GrantFiled: April 26, 2001Date of Patent: August 14, 2007Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Yoshiharu Kobayashi, Akira Mutoh, Shin-ichi Tanaka, Nobuo Akahira