Patents by Inventor Masami Ikota

Masami Ikota 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: 11713963
    Abstract: Line-edge roughness or line width roughness is evaluated while preventing influence of noise caused by a device or an environment. Therefore, an averaged signal profile 405 in which a moving average of S pixels (S is an integer greater than 1) is taken in a Y direction is obtained from a signal profile showing a secondary electron signal amount distribution in an X direction with respect to a predetermined Y coordinate obtained from a top-down image, an edge position 406 of a line pattern is extracted based on the averaged signal profile, and a noise floor height is calculated based on a first power spectral density 407 of LER data or LWR data based on the extracted edge position and a second power spectral density 409 of a rectangular window function corresponding to the moving average of the S pixels.
    Type: Grant
    Filed: May 29, 2019
    Date of Patent: August 1, 2023
    Assignee: HITACHI HIGH-TECH CORPORATION
    Inventors: Atsuko Shintani, Takahiro Kawasaki, Kazuhisa Hasumi, Masami Ikota, Hiroki Kawada
  • Publication number: 20230230886
    Abstract: To provide a technique capable of quantitatively grasping a change in three-dimensional shape including a cross-sectional shape of a pattern within a surface of a wafer or between wafers in a non-destructive manner before cross-sectional observation.
    Type: Application
    Filed: December 14, 2022
    Publication date: July 20, 2023
    Applicant: Hitachi High-Tech Corporation
    Inventors: Kenji YASUI, Mayuka OSAKI, Hitoshi NAMAI, Yuki OJIMA, Wataru NAGATOMO, Masami IKOTA, Maki KIMURA
  • Publication number: 20220301812
    Abstract: An object of the invention is to provide an ion beam device that can measure structures existing at different positions in a thickness direction of a sample. The ion beam device according to the invention irradiates a sample with an ion beam obtained by ionizing elements contained in a gas. After obtaining a first observation image of a first shape of a first region using a first ion beam, the ion beam device processes a hole in a second region of the sample using a second ion beam, and uses the first ion beam on the processed hole to obtain a second observation image of a second shape of the second region. By comparing the first observation image and the second observation image, a relative positional relation between the first shape and the second shape is obtained (refer to FIG. 7C).
    Type: Application
    Filed: September 17, 2019
    Publication date: September 22, 2022
    Inventors: Shinichi Matsubara, Masami Ikota
  • Patent number: 11430106
    Abstract: An object of the invention is to quantitatively evaluate crystal growth amount in a wide range from an undergrowth state to an overgrowth state with nondestructive inspection. By using a plenty of image feature values such as pattern brightness, a pattern area and a pattern shape which are extracted from an SEM image, and depending on whether brightness inside a pattern is lower than brightness outside the pattern (401), undergrowth and overgrowth is determined (402, 405). Based on a brightness difference or the pattern area, a growth amount index or a normality index of crystal growth in a concave pattern such as a hole pattern or a trench pattern is calculated (404, 407).
    Type: Grant
    Filed: August 23, 2017
    Date of Patent: August 30, 2022
    Assignee: HITACHI HIGH-TECH CORPORATION
    Inventors: Takeyoshi Ohashi, Atsuko Shintani, Masami Ikota, Kazuhisa Hasumi
  • Publication number: 20220034653
    Abstract: Line-edge roughness or line width roughness is evaluated while preventing influence of noise caused by a device or an environment. Therefore, an averaged signal profile 405 in which a moving average of S pixels (S is an integer greater than 1) is taken in a Y direction is obtained from a signal profile showing a secondary electron signal amount distribution in an X direction with respect to a predetermined Y coordinate obtained from a top-down image, an edge position 406 of a line pattern is extracted based on the averaged signal profile, and a noise floor height is calculated based on a first power spectral density 407 of LER data or LWR data based on the extracted edge position and a second power spectral density 409 of a rectangular window function corresponding to the moving average of the S pixels.
    Type: Application
    Filed: May 29, 2019
    Publication date: February 3, 2022
    Inventors: Atsuko Shintani, Takahiro Kawasaki, Kazuhisa Hasumi, Masami Ikota, Hiroki Kawada
  • Patent number: 10943762
    Abstract: An inspection system is provided that includes a microscope that scans a sample with a beam that is an incident electron beam, and an image processing device that controls the microscope.
    Type: Grant
    Filed: January 30, 2019
    Date of Patent: March 9, 2021
    Assignee: HITACHI HIGH-TECH CORPORATION
    Inventors: Takeyoshi Ohashi, Masami Ikota
  • Publication number: 20200219243
    Abstract: An object of the invention is to quantitatively evaluate crystal growth amount in a wide range from an undergrowth state to an overgrowth state with nondestructive inspection. By using a plenty of image feature values such as pattern brightness, a pattern area and a pattern shape which are extracted from an SEM image, and depending on whether brightness inside a pattern is lower than brightness outside the pattern (401), undergrowth and overgrowth is determined (402, 405). Based on a brightness difference or the pattern area, a growth amount index or a normality index of crystal growth in a concave pattern such as a hole pattern or a trench pattern is calculated (404, 407).
    Type: Application
    Filed: August 23, 2017
    Publication date: July 9, 2020
    Inventors: Takeyoshi OHASHI, Atsuko SHINTANI, Masami IKOTA, Kazuhisa HASUMI
  • Patent number: 10672119
    Abstract: In order to provide an inspection device capable of quantitatively evaluating a pattern related to a state of a manufacturing process or performance of an element, it is assumed that an inspection device includes an image analyzing unit that analyzes a top-down image of a sample in which columnar patterns are formed at a regular interval, in which an image analyzing unit 240 includes a calculation unit 243 that obtains a major axis, a minor axis, an eccentricity, and an angle formed by a major axis direction with an image horizontal axis direction of the approximated ellipse as a first index and a Cr calculation unit 248 that obtains a circumferential length of an outline of a columnar pattern on the sample and a value obtained by dividing a square of the circumferential length by a value obtained by multiplying an area surrounded by the outline and 4? as a second index.
    Type: Grant
    Filed: September 10, 2015
    Date of Patent: June 2, 2020
    Assignee: HITACHI HIGH-TECH CORPORATION
    Inventors: Atsuko Yamaguchi, Masami Ikota, Kazuhisa Hasumi
  • Publication number: 20190244783
    Abstract: An inspection system is provided that includes a microscope that scans a sample with a beam that is an incident electron beam, and an image processing device that controls the microscope.
    Type: Application
    Filed: January 30, 2019
    Publication date: August 8, 2019
    Inventors: Takeyoshi OHASHI, Masami IKOTA
  • Patent number: 10295339
    Abstract: A pattern measurement method and measurement apparatus are provided that appropriately evaluate the deformation of a pattern occurring due to a micro loading effect. In order to achieve the above-mentioned object, there are provided pattern measurement method and apparatus that measure a dimension of a pattern formed on a sample. In the pattern measurement method and apparatus, distances between a reference pattern and a plurality of adjacent patterns adjacent to the reference pattern or inner diameters of the reference pattern in a plurality of directions are measured, and the measurement results of the plurality of distances between the reference pattern and the adjacent patterns or the measurement results of the inner diameters of the reference pattern in the plurality of directions are classified according to distances between the reference pattern and the adjacent patterns or directions of the patterns adjacent to the reference pattern.
    Type: Grant
    Filed: July 21, 2016
    Date of Patent: May 21, 2019
    Assignee: Hitachi High-Technologies Corporation
    Inventors: Kazuhisa Hasumi, Masami Ikota
  • Publication number: 20180308228
    Abstract: In order to provide an inspection device capable of quantitatively evaluating a pattern related to a state of a manufacturing process or performance of an element, it is assumed that an inspection device includes an image analyzing unit that analyzes a top-down image of a sample in which columnar patterns are formed at a regular interval, in which an image analyzing unit 240 includes a calculation unit 243 that obtains a major axis, a minor axis, an eccentricity, and an angle formed by a major axis direction with an image horizontal axis direction of the approximated ellipse as a first index and a Cr calculation unit 248 that obtains a circumferential length of an outline of a columnar pattern on the sample and a value obtained by dividing a square of the circumferential length by a value obtained by multiplying an area surrounded by the outline and 4? as a second index.
    Type: Application
    Filed: September 10, 2015
    Publication date: October 25, 2018
    Inventors: Atsuko YAMAGUCHI, Masami IKOTA, Kazuhisa HASUMI
  • Patent number: 9831062
    Abstract: An object of the present invention is to provide a method for pattern measurement and a charged particle radiation device in which a pattern formed by using a DSA technique can be very precisely measured and inspected. According to an aspect for achieving the object, a method for pattern measurement or a charged particle radiation device for realizing the measurement is proposed as follows. A charged particle is radiated to a polymer compound used for a self-organization lithography technique, and a specific polymer is considerably contracted as compared to the other polymer among multiple polymers forming the polymer compound. Thereafter, dimensions between multiple edges of the other polymer are measured, based on a signal obtained by scanning a region including the other polymer with the charged particle beam.
    Type: Grant
    Filed: January 22, 2014
    Date of Patent: November 28, 2017
    Assignee: Hitachi High-Technologies Corporation
    Inventors: Makoto Suzuki, Satoru Yamaguchi, Kei Sakai, Miki Isawa, Satoshi Takada, Kazuhisa Hasumi, Masami Ikota
  • Patent number: 9823065
    Abstract: The invention discloses a technique that estimates micro roughness from a total sum of detection signals from plural detection systems and signal ratios, using a light scattering method. The technique rotates and translates a wafer at high speed to measure the entire surface of the wafer with high throughput. The relationship between the micro roughness and the intensity of scattered light varies according to a material of the wafer and a film thickness thereof. Moreover, calibration of an apparatus is also necessary. Thus, for instance, the invention provides a technique that has a function of correcting an optically acquired detection result using a sample which is substantially the same as a measurement target and makes the optically acquired detection result come close to a result measured by an apparatus, such as an AFM, using a different measurement principle.
    Type: Grant
    Filed: January 10, 2014
    Date of Patent: November 21, 2017
    Assignee: Hitachi High-Technologies Corporation
    Inventors: Takanori Kondo, Takahiro Jingu, Masaaki Ito, Masami Ikota
  • Publication number: 20170030712
    Abstract: A pattern measurement method and measurement apparatus are provided that appropriately evaluate the deformation of a pattern occurring due to a micro loading effect. In order to achieve the above-mentioned object, there are provided pattern measurement method and apparatus that measure a dimension of a pattern formed on a sample. In the pattern measurement method and apparatus, distances between a reference pattern and a plurality of adjacent patterns adjacent to the reference pattern or inner diameters of the reference pattern in a plurality of directions are measured, and the measurement results of the plurality of distances between the reference pattern and the adjacent patterns or the measurement results of the inner diameters of the reference pattern in the plurality of directions are classified according to distances between the reference pattern and the adjacent patterns or directions of the patterns adjacent to the reference pattern.
    Type: Application
    Filed: July 21, 2016
    Publication date: February 2, 2017
    Inventors: Kazuhisa HASUMI, Masami IKOTA
  • Publication number: 20150357158
    Abstract: An object of the present invention is to provide a method for pattern measurement and a charged particle radiation device in which a pattern formed by using a DSA technique can be very precisely measured and inspected. According to an aspect for achieving the object, a method for pattern measurement or a charged particle radiation device for realizing the measurement is proposed as follows. A charged particle is radiated to a polymer compound used for a self-organization lithography technique, and a specific polymer is considerably contracted as compared to the other polymer among multiple polymers forming the polymer compound. Thereafter, dimensions between multiple edges of the other polymer are measured, based on a signal obtained by scanning a region including the other polymer with the charged particle beam.
    Type: Application
    Filed: January 22, 2014
    Publication date: December 10, 2015
    Applicant: HITACHI HIGH-TECHNOLOGIES CORPORATION
    Inventors: Makoto SUZUKI, Satoru YAMAGUCHI, Kei SAKAI, Miki ISAWA, Satoshi TAKADA, Kazuhisa HASUMI, Masami IKOTA
  • Publication number: 20150354947
    Abstract: Patent Document 1 discloses height measurement using an atomic force microscope (AFM) as means for measuring micro roughness. However, since it takes time for this measurement, it is difficult to apply a single display to inspection of all wafers and the entire surface thereof in an in-line manner. The invention provides a technique that estimates micro roughness from a total sum of detection signals from plural detection systems and signal ratios, using a light scattering method. The technique rotates and translates a wafer at high speed to measure the entire surface of the wafer with high throughput. Further, the relationship between the micro roughness and the intensity of scattered light varies according to a material of the wafer and a film thickness thereof. Further, calibration of an apparatus is also necessary.
    Type: Application
    Filed: January 10, 2014
    Publication date: December 10, 2015
    Inventors: Takanori KONDO, Takahiro JINGU, Masaaki ITO, Masami IKOTA
  • Patent number: 8358406
    Abstract: An object of the invention is to provide a defect inspection method which can prevent the failure in detecting a defect, caused by saturation of a pattern signal obtained by inspecting an inspected object, so that the investigation of the cause for defect occurrence can be done earlier. To achieve this object, according to an embodiment of the invention, there is provided a defect inspection that irradiates laser light on an inspected object having a pattern formed thereon, detects a signal from the inspected object and thereby detects a defect, the inspection including: inputting pattern information contained in layout data on the inspected object; determining based on the inputted pattern information, at least one of arrangement, repetitiveness and density for each of a plurality of inspected areas of the inspected object; estimating a saturation level of the detected signal based on the determination result; and determining a transmittance condition so that the signal does not saturate.
    Type: Grant
    Filed: January 8, 2009
    Date of Patent: January 22, 2013
    Assignee: Hitachi High-Technologies Corporation
    Inventors: Masami Ikota, Tomohiro Funakoshi, Shigeaki Hijikata
  • Publication number: 20090180109
    Abstract: An object of the invention is to provide a defect inspection method which can prevent the failure in detecting a defect, caused by saturation of a pattern signal obtained by inspecting an inspected object, so that the investigation of the cause for defect occurrence can be done earlier. To achieve this object, according to an embodiment of the invention, there is provided a defect inspection that irradiates laser light on an inspected object having a pattern formed thereon, detects a signal from the inspected object and thereby detects a defect, the inspection including: inputting pattern information contained in layout data on the inspected object; determining based on the inputted pattern information, at least one of arrangement, repetitiveness and density for each of a plurality of inspected areas of the inspected object; estimating a saturation level of the detected signal based on the determination result; and determining a transmittance condition so that the signal does not saturate.
    Type: Application
    Filed: January 8, 2009
    Publication date: July 16, 2009
    Inventors: Masami Ikota, Tomohiro Funakoshi, Shigeaki Hijikata
  • Patent number: 6757621
    Abstract: A process management system in accordance with the present invention includes inspection apparatuses for inspecting defects on a wafer, the inspection apparatuses being connected through a communication network, inspection information and image information obtained from these inspection apparatuses being collected to construct a data base and an image file, therein definition of defects is given by combinations of elements which characterize the defect based on the inspection information and the image information obtained from the inspection apparatuses. By giving definition of the defect, characteristics of the defect can be subdivided and known. Therefore, the cause of a defect can be studied.
    Type: Grant
    Filed: January 16, 2003
    Date of Patent: June 29, 2004
    Assignees: Hitachi, Ltd., Hitachi Engineering Co., Ltd.
    Inventors: Fumio Mizuno, Seiji Isogai, Kenji Watanabe, Yasuhiro Yoshitake, Terushige Asakawa, Yuichi Ohyama, Hidekuni Sugimoto, Seiji Ishikawa, Masataka Shiba, Jun Nakazato, Makoto Ariga, Tetsuji Yokouchi, Toshimitsu Hamada, Ikuo Suzuki, Masami Ikota, Mari Nozoe, Isao Miyazaki, Yoshiharu Shigyo
  • Patent number: 6661912
    Abstract: An apparatus for inspecting foreign matter in repeated micro-miniature patterns formed upon a surface of an object to be inspected, comprising: an inspection light illuminating device for irradiating an inspection light directed upon the surface of the object to be inspected, on which the repeated micro-miniature patterns are formed; a scattered light detector for detecting scattered light of the inspection light being scattered upon the surface said object to be inspected; means for obtaining a first information related to a foreign matter attaching upon the surface of said object to be inspected, which is obtained on a basis of the detection of said scattered light by said scattered light detector; an illumination means for applying a bright field illumination upon the surface of the object to be inspected, on which the repeated micro-miniature patterns are formed; means for picking up the image of the foreign matter, under a bright field illumination by said illumination means; means for obtaining a second
    Type: Grant
    Filed: August 3, 1998
    Date of Patent: December 9, 2003
    Assignee: Hitachi Electronics Engineering Co., Ltd.
    Inventors: Junichi Taguchi, Aritoshi Sugimoto, Masami Ikota, Yuko Inoue, Tetsuya Watanabe, Wakana Shinke