公开(公告)号：JP2001116633A

公开(公告)日：2001-04-27

申请号：JP27588399

申请日：1999-09-29

Applicant: IBM

Inventor： SOGA EIJI ,  TSUDA SHINGO ,  SATO KIYOSHI

IPC: G01L1/16 ,  G01R31/02 ,  G11B5/48 ,  H01L41/047 ,  H01L41/08 ,  H01L41/113 ,  H01L41/22 ,  H01L41/313 ,  H02K33/18

Abstract: PROBLEM TO BE SOLVED: To provide a piezoelectric sensor not allowing sacrifice of either workability in soldering of a lead wire to one electrode of the piezoelectric sensor or workability in joining and fixing of the other electrode to a prescribed member with an adhesive, allowing prevention of a short circuit between the electrodes by the protruding adhesive when joining and fixing the ground electrode of the piezoelectric sensor to an electroconductive portion of a measured member with the adhesive, and allowing easy inspection of electrical connection between the ground electrode and the electroconductive portion of the measured member. SOLUTION: Two electrodes 18b, 18c of a piezoelectric sensor 18 are respectively composed of an electrode member suitable for soldering and an electrode member suitable for joining with an adhesive. The ground electrode 18c of the piezoelectric sensor 18 is joined and electrically connected to a measured member 7b with the non-electroconductive adhesive. By measuring a capacitance between the output electrode 18b of the piezoelectric sensor 18 and the measured member 7b, the electrical connection is checked.

公开(公告)号：JP2001057037A

公开(公告)日：2001-02-27

申请号：JP22749399

申请日：1999-08-11

Applicant: IBM

Inventor： TSUDA SHINGO ,  SOGA EIJI ,  SATO KIYOSHI ,  FUUIN FAN ,  SENBA TETSUO

IPC: G11B21/02 ,  G11B5/48 ,  H02K33/18 ,  H02K41/035

Abstract: PROBLEM TO BE SOLVED: To obtain an actuator that enables constantly stable control regardless of the turning position of an actuator arm, in positively damping butterfly resonance of the actuator and also coil breathing resonance. SOLUTION: A narrow-shaped additional S pole 16b is arranged on the outer edge 10c of a flat coil 10 comprising VCM, in the manner that 5 magnetic pole of the same poIarity operates regardless of the turning position of an actuator arm 8. As a result, it is possible to keep in the same phase the phase characteristics of the transfer function of the actuator particularly near the coil breathing resonance frequency; therefore, in positively damping the butterfly phenomenon of the actuator and also the coil breathing phenomenon, a stable control is always possible regardless of the turning position of the actuator arm.