Patents Assigned to Sony Precision Technology Inc.
  • Patent number: 7187449
    Abstract: A displacement detection device having excellent stability with the lapse of time and suitable for reduction in size and weight includes: a light source for emitting light; polarizing light splitting unit for splitting the light emitted from the light source into two light beams having difference polarized components, radiating the two light beams to an external optical system, and combining the two light beams reflected by the external optical system to generate combined light; a phase plate provided between the light source and the polarizing light splitting unit and adapted for changing the polarization state of the light emitted from the light source and leading the light to the polarizing light splitting unit; light splitting films for splitting the combined light generated by the polarizing light splitting unit into plural light beams; polarizing units for transmitting only a predetermined polarized components of the split combined light beams; and light-receiving elements for photoelectrically converti
    Type: Grant
    Filed: April 15, 2003
    Date of Patent: March 6, 2007
    Assignee: Sony Precision Technology Inc.
    Inventors: Hideaki Tamiya, Kayoko Taniguchi, Akihiro Kuroda, Hidehiro Kume
  • Patent number: 7171039
    Abstract: An image of an inspection object is picked up by an image pickup unit, and a characteristics quantity of an image of a defect part extracted by a defect extracting unit is extracted and digitized by a characteristics extracting unit. A database preparing unit regroups defects having similar characteristics by a defect classification unit on the basis of the characteristics information digitized by the characteristics extracting unit with respect to defects belonging to a defect group selected and designated by an operator via a display/input unit, and prepares on a database memory a database in which the defects of the inspection object are hierarchically classified.
    Type: Grant
    Filed: August 16, 2002
    Date of Patent: January 30, 2007
    Assignee: Sony Precision Technology Inc.
    Inventors: Hiroshi Kondo, Masatsugu Okuyama, Yo Saito
  • Patent number: 6980303
    Abstract: The present invention provides a light emitting/receiving composite unit (1) for emitting and receiving lights, which includes a light source (3), an optical splitting unit (4) for splitting returning lights to the composite unit (1) into a plurality of lights, a polarizing unit (5) for increasing and decreasing quantity of lights transmitted therefrom corresponding to polarization state of the returning lights, and an optical receiving unit (6) which has a plurality of photo-detecting elements (6—1 to 6—4) for detecting the lights transmitted through the polarizing unit (5), which are unitedly integrated into one unit.
    Type: Grant
    Filed: February 1, 2002
    Date of Patent: December 27, 2005
    Assignees: Sony Corporation, Sony Precision Technology Inc.
    Inventors: Hidehiro Kume, Akihito Nakayama, Kayoko Taniguchi, Akihiro Kuroda
  • Patent number: 6935043
    Abstract: In a scale device including a case member (8) having a guide opening (9) formed therein, seal lip members (12A, 12B), a carrier unit (13) having seal lip pressing means (22, 23) formed thereon, and a coupling member (16) which slides inside and relative to the guide opening (9), the seal lip members (12A, 12B) are pressed at end portions (12e, 12f) thereof by the seal lip pressing means (22, 23) in the vicinity of opposite end portions (16b, 16c) of the coupling member (16) to prevent the seal lip members (12A, 12B) from being spread. Thus, any gaps can be prevented from taking place between the seal lip members (12A, 12B) and coupling member (16) in the vicinity of the opposite end portions (12e, 12f) of the latter. Therefore, dust or the like can be prevented from entering the case member (8).
    Type: Grant
    Filed: September 29, 2003
    Date of Patent: August 30, 2005
    Assignee: Sony Precision Technology Inc.
    Inventors: Gunichi Nakamura, Mitsuru Ohno
  • Patent number: 6931741
    Abstract: In a scale device including a scale unit (4) and detector (5), the scale unit (4) includes a scale member (6) formed from a long material and having at least a pair of fixing holes (12) formed therein across a position signal carrying area (11) defined thereon and which carries position signals, and a case member (7) housing the scale member (6) therein and having formed therein a pair of fixing holes (15) through which there is inserted a fastening member (13) to be screwed into a mounting hole (10) formed in a stationary part (2) of a machine to which the scale device is to be installed. The detector (5) is fixed to a moving part (3) of the machine, which moves relative to the stationary part (2), and includes a sensor (29) which moves oppositely to the position signal carrying area (11) on the scale member (6). The scale unit (4) is fixed to the stationary part (2) with the scale member (6) and case member (7) being fastened together by the fastening member (13).
    Type: Grant
    Filed: September 30, 2003
    Date of Patent: August 23, 2005
    Assignee: Sony Precision Technology Inc.
    Inventors: Gunichi Nakamura, Mitsuru Ohno
  • Patent number: 6879405
    Abstract: A displacement pickup is provided which comprising a scale (12) having defined thereon a first area (12a) where positional information is recorded with a predetermined pitch and a second area (12b) where positional information is recorded with a pitch different from that in the first area (12a), a first reader (10) which reads the positional information recorded in the first area (12a), a first phase detector (14) which detects a first phase on the basis of the positional information read by the first reader (10), a second reader (11) which reads the positional information recorded in the second area (12b), a second phase detector (15) which detects a second phase on the basis of the positional information read by the second reader (11), a phase comparator (16) which makes a comparison between the first and second phases, and an origin signal selector (18) which produce a plurality of signals according to the result of comparison and selects an arbitrary one of the plurality of signals on the basis of the pos
    Type: Grant
    Filed: November 10, 2003
    Date of Patent: April 12, 2005
    Assignee: Sony Precision Technology, Inc.
    Inventors: Hideaki Tamiya, Kayoko Taniguchi, Eiko Kanbara
  • Patent number: 6798498
    Abstract: A polysilicon film evaluation apparatus is provided which enables objective automatic evaluation of the status of a polysilicon film, as formed to a high accuracy in a contact-free fashion.
    Type: Grant
    Filed: January 18, 2002
    Date of Patent: September 28, 2004
    Assignees: Sony Corporation, Sony Precision Technology Inc.
    Inventors: Hiroyuki Wada, Koichi Tatsuki, Nobuhiko Umezu, Eiji Isomura, Tetsuo Abe, Tadashi Hattori, Akifumi Ooshima, Makoto Uragaki, Yoshiyuki Noguchi, Hiroyuki Tamaki, Masataka Ebe, Tomohiro Ishiguro, Yasuyuki Kato
  • Patent number: 6788053
    Abstract: A sensor coil is provided on a core which forms a magnetic circuit for driving a linear motor, and the core is excited by electrifying the sensor coil at a high frequency. The high-frequency excitation is carried out in such a manner that the sensor coil is not magnetically saturated, and an eddy current is generated in the core. The impedance of the sensor coil is detected in this state and the quantity of a magnetic flux generated in the core constituting the magnetic circuit is detected on the basis of the impedance. Thus, the influence on the magnetic circuit itself is reduced and higher accuracy, miniaturization and lower power consumption are realized.
    Type: Grant
    Filed: June 25, 2002
    Date of Patent: September 7, 2004
    Assignee: Sony Precision Technology Inc.
    Inventors: Yasuo Nekado, Masaaki Kusumi, Ken Onoe
  • Publication number: 20040157067
    Abstract: In a magnetic sensor (1) including a substrate (10) having a magnetism-sensitive element (11) formed thereon, a hard membrane (14) is formed on the outermost surface, an organic film (13) to relieve the stress caused by the hard membrane (14) is formed under the hard membrane (14), and an inorganic film (12) to relieve the stress caused by the organic film (13) is formed between the organic film (13) and magnetism-sensitive element (11). Also, an intermediate film formed from an element having a large force of bonding to carbon may be formed between the organic film (13) and hard membrane (14). Thus, the magnetic sensor (MR sensor, for example) can be protected against an external shock.
    Type: Application
    Filed: October 20, 2003
    Publication date: August 12, 2004
    Applicant: Sony Precision Technology Inc.
    Inventors: Masaaki Kusumi, Mitsuru Ohno, Michio Okano, Hideki Nakamori, Touru Sumiya, Akitaka Tsunogae, Tomoyuki Nakada, Teruyuki Miura, Yoshihiko Ohkawara
  • Publication number: 20040154181
    Abstract: In a scale device including a scale unit (4) and detector (5), the scale unit (4) includes a scale member (6) formed from a long material and having at least a pair of fixing holes (12) formed therein across a position signal carrying area (11) defined thereon and which carries positions signals, and a case member (7) housing the scale member (6) therein and having formed therein a pair of fixing holes (15) through which there is penetrated a fastening member (13) to be screwed into a mounting hole (10) formed in a stationary part (2) of a machine to which the scale device is to be installed. The detector (5) is fixed to a moving part (3) of the machine, which moves relative to the stationary part (2), and includes a sensor (29) which moves oppositely to the position signal carrying area (11) on the scale member (6). The scale unit (4) is fixed to the stationary part (2) with the scale member (6) and case member (7) being fastened together by the fastening member (13).
    Type: Application
    Filed: September 30, 2003
    Publication date: August 12, 2004
    Applicant: Sony Precision Technology Inc.
    Inventors: Gunichi Nakamura, Mitsuru Ohno
  • Patent number: 6772088
    Abstract: A position transducer capable of accurately detecting an n-bit code by a small number of ABS detectors when there is provided one ABS track. In an ABS head, the ABS detectors 101 to 10n+m are disposed for a distance &lgr;1 between the first ABS detector 101 and (n+m)th ABS detector 10n+m to satisfy a requirement (n−1)&lgr;+2&dgr;<&lgr;1 and a distance &lgr;2 between two successive ones of the ABS detectors to satisfy a requirement 2&dgr;<&lgr;2<&lgr;−2&dgr;, so that at least one ABS detector is opposite to a stable area T in each of micro-areas at n successive bits.
    Type: Grant
    Filed: February 21, 2003
    Date of Patent: August 3, 2004
    Assignee: Sony Precision Technology Inc.
    Inventors: Yasuo Nekado, Michio Okano, Shigeru Ishimoto, Mitsuru Ohno, Masaaki Kusumi
  • Patent number: 6772101
    Abstract: Angle data ranging from 0° to 360° obtained by performing polar conversion with respect to a periodic signal are input to a low pass filter having: a phase accumulator for outputting smoothed angle data; a phase comparator for obtaining a phase error between the angle data and the smoothed angle data; a first amplifier for amplifying the phase error; a second amplifier for further amplifying the phase error; an integrator for integrating the phase error PE amplified by the second amplifier to obtain a velocity error; and an adder for adding the phase error amplified by the first amplifier and the velocity error to determine a control voltage. The phase accumulator controls the frequency of the smoothed angle data so that the phase error is zero based on the control voltage to remove a high frequency component in the angle data.
    Type: Grant
    Filed: August 28, 2000
    Date of Patent: August 3, 2004
    Assignee: Sony Precision Technology Inc.
    Inventors: Masato Tanaka, Shigeru Ishimoto, Toyohiko Matsuda, Katsumi Kitamura
  • Patent number: 6768426
    Abstract: A position detection apparatus including a detection unit for an absolute track including a plural number of ABS heads for absolute track, in which the separation between neighboring heads is broadened. The n ABS heads 10-1 to 10-n are arrayed to satisfy the following equations 1 and 2 when n is an even number and the following equations 1 and 3 when n is an odd number: &lgr;1=m&lgr;, m being an integer not less than 2  (1) &lgr;1≠k(2n/2+1)&lgr;, k being a natural number  (2) &lgr;1≠k(2n+1)&lgr;  (3). By arraying the ABS heads 10-1 to 10-n under these conditions, the separation between neighboring ones of the ABS heads 10-1 to 10-n can be 2&lgr; or larger.
    Type: Grant
    Filed: June 23, 2003
    Date of Patent: July 27, 2004
    Assignee: Sony Precision Technology Inc.
    Inventors: Yasuo Nekado, Masaaki Kusumi
  • Publication number: 20040095583
    Abstract: A displacement pickup is provided which comprising a scale (12) having defined thereon a first area (12a) where positional information is recorded with a predetermined pitch and a second area (12b) where positional information is recorded with a pitch different from that in the first area (12a), a first reader (10) which reads the positional information recorded in the first area (12a), a first phase detector (14) which detects a first phase on the basis of the positional information read by the first reader (10), a second reader (11) which reads the positional information recorded in the second area (12b), a second phase detector (15) which detects a second phase on the basis of the positional information read by the second reader (11), a phase comparator (16) which makes a comparison between the first and second phases, and an origin signal selector (18) which produce a plurality of signals according to the result of comparison and selects an arbitrary one of the plurality of signals on the basis of the pos
    Type: Application
    Filed: November 10, 2003
    Publication date: May 20, 2004
    Applicant: Sony Precision Technology Inc.
    Inventors: Hideaki Tamiya, Kayoko Taniguchi, Eiko Kanbara
  • Publication number: 20040065486
    Abstract: In a scale device including a case member (8) having a guide opening (9) formed therein, seal lip members (12A, 12B), a carrier unit (13) having seal lip pressing means (22, 23) formed thereon, and a coupling member (16) which slides inside and relative to the guide opening (9), the seal lip members (12A, 12B) are pressed at end portions (12e, 12f) thereof by the seal lip pressing means (22, 23) in the vicinity of opposite end portions (16b, 16c) of the coupling member (16) to prevent the seal lip members (12A, 12B) from being spread. Thus, any gaps can be prevented from taking place between the seal lip members (12A, 12B) and coupling member (16) in the vicinity of the opposite end portions (12e, 12f) of the latter. Therefore, dust or the like can be prevented from entering the case member (8).
    Type: Application
    Filed: September 29, 2003
    Publication date: April 8, 2004
    Applicant: Sony Precision Technology Inc.
    Inventors: Gunichi Nakamura, Mitsuru Ohno
  • Patent number: 6711109
    Abstract: A method and an apparatus for measuring eccentricity of the tracks of a disk. The apparatus includes a spindle for driving a turntable carrying a disk, an angle detecting device for detecting the angle of rotation of the spindle, a reproducing head for reproducing information from the disk, a pair of servos for controlling the tracking operation of the head, an eccentricity measuring device for measuring the extent of eccentricity from a signal reproduced by the head, an error detecting device for obtaining a tracking error signal by turning on the tracking servos, and an operation device for determining the direction of eccentricity from the angle of rotation and the tracking error signal, determining a vector quantity of the eccentricity of the tracks from the extent of eccentricity and the direction of eccentricity, and for performing a vector operation to determine the quantity of eccentricity of the tracks.
    Type: Grant
    Filed: August 31, 2000
    Date of Patent: March 23, 2004
    Assignee: Sony Precision Technology Inc.
    Inventor: Shuichi Fukuda
  • Patent number: 6707775
    Abstract: A method and apparatus for measuring the crosstalk of an optical disc of an optical disc player adapted to reproduce signals recorded on the disc, in which there are concentrically or spirally formed continuous recorded signal strings or signal recording regions and in which there is provided a positioning aperture at the center of the disc substantially concentric with said recorded signal strings or signal recording regions. A light beam is wobbled at a predetermined amplitude in the direction along the radius of the optical disc. The wobbling period is set so as to be asynchronous with the period of the optical disc rotation. The ratio between the quantity of the traverse signal obtained by the optical pickup and the quantity of strays signals is measured as crosstalk.
    Type: Grant
    Filed: May 11, 2000
    Date of Patent: March 16, 2004
    Assignee: Sony Precision Technology Inc.
    Inventors: Akira Miyagawa, Shuichi Fukuda
  • Patent number: 6693565
    Abstract: There is provided a position transducer (1) capable of accurately detecting an n-bit code by n ABS detectors from one ABS track. When an INC value is under j or over k, signal output from each of the ABS detectors is binarized based on a threshold h and also based on a threshold l. First, an ABS value decider (24) decides that a bit is “H” when it has been judged as being “H” on the basis of both the thresholds and a bit is “L” when it is has been judged as being “L” on the basis of both the thresholds. When the INC value is under j, a lower bit has the same code as that of the deiced bit. So, the ABS value decider (24) decides that the lower bit is “H” or “L”. On the other hand, when the INC value is over k, an upper bit has the same code as the decided code. Thus, the ABS value decider (24) decides that the upper bit is “H” or “L”.
    Type: Grant
    Filed: February 21, 2003
    Date of Patent: February 17, 2004
    Assignee: Sony Precision Technology Inc.
    Inventors: Masaaki Kusumi, Michio Okano, Shigeru Ishimoto, Mitsuru Ohno, Yasuo Nekado
  • Patent number: 6668996
    Abstract: Two sensors are provided on a clutch core. Sensor coils are driven at a high frequency by a high-frequency driving circuit. As the sensors sense a magnetic flux of a magnetic circuit including the clutch core and an armature, the impedance of the sensor coils changes. In accordance with the outputs from the sensor coils at this point, an impedance detecting circuit detects the impedance of the sensor coils. Then, an impedance combining circuit combines the impedance of the sensor coils. On the basis of the combined impedance, a current control circuit controls a current supplied to an exciting coil. Thus, the attracting force of the armature to the core excited by the exciting coil is controlled.
    Type: Grant
    Filed: July 2, 2002
    Date of Patent: December 30, 2003
    Assignees: Sony Precision Technology Inc., Honda Giken Kogyo Kabushiki Kaisha
    Inventors: Yasuo Nekado, Masaaki Kusumi, Ken Onoe, Akihiro Iwazaki, Koji Matsubara, Shinji Ohkuma, Tatsuhiro Tomari, Shinichi Inagawa
  • Publication number: 20030202189
    Abstract: A displacement detection device having excellent stability with the lapse of time and suitable for reduction in size and weight includes: a light source for emitting light; polarizing light splitting unit for splitting the light emitted from the light source into two light beams having difference polarized components, radiating the two light beams to an external optical system, and combining the two light beams reflected by the external optical system to generate combined light; a phase plate provided between the light source and the polarizing light splitting unit and adapted for changing the polarization state of the light emitted from the light source and leading the light to the polarizing light splitting unit; light splitting films for splitting the combined light generated by the polarizing light splitting unit into plural light beams; polarizing units for transmitting only a predetermined polarized components of the split combined light beams; and light-receiving elements for photoelectrically converti
    Type: Application
    Filed: April 15, 2003
    Publication date: October 30, 2003
    Applicant: Sony Precision Technology Inc.
    Inventors: Hideaki Tamiya, Kayoko Taniguchi, Akihiro Kuroda, Hidehiro Kume