公开(公告)号：DE69631855T2

公开(公告)日：2005-01-27

申请号：DE69631855

申请日：1996-05-24

Applicant: SHARP KK

Inventor： OKADA HIDEO ,  NISHIKAWA MASAYUKI ,  OKUDA TOHRU

IPC: G02B26/08 ,  G02B27/64 ,  H04N5/225 ,  H04N5/335 ,  H04N5/349 ,  H04N5/351 ,  H04N5/355 ,  H04N5/372 ,  H04N5/378

Abstract: In an image shifting mechanism (10, 100), a pair of bimorph type piezoelectric elements (22a, 22b, 122a, 122b) are disposed on both sides of a refraction plate (21, 121). The bimorph type piezoelectric elements (22a, 22b, 122a, 122b) have a cantilever structure. The base end sides of the bimorph type piezoelectric elements are bonded and secured to a stage (25), and the free end sides are sandwiched between an upper holding plate (23) and a lower holding plate (24) so as to support one end of the refraction plate (21, 121). When the bimorph type piezoelectric elements (22a, 22b; 122a, 122b) are displaced, the refraction plate (21, 121)can be inclined around its rotation center O. In the case of this structure, the specifications of the refraction plate and the bimorph type piezoelectric elements (22a, 22b: 122a, 122b) are determined so that the relationship between the moment of inertia Ic around the rotation center of the moving portions of the image shifting mechanism and the moment of inertia Ig around the center of gravity of the image shifting mechanism is Ic/Ig

公开(公告)号：DE69819623T2

公开(公告)日：2004-09-23

申请号：DE69819623

申请日：1998-07-31

Applicant: SHARP KK

Inventor： KAKIWAKI SHIGEAKI ,  TANAKA TOSHIYUKI ,  OKUDA TOHRU ,  NAGATOME SEIICHI

IPC: F16F7/108 ,  G03G15/00 ,  G03G15/16

Abstract: An image forming apparatus includes a transfer drum which is rotatable driven, wherein the transfer drum includes a main body drum, a dynamic vibration reducer composed of an inertia pipe having an inertia moment, a sponge rubber serving as an elastic element having a spring property and a damping element having a damping property, wherein vibrations in a predetermined frequency band are dynamically reduced by the inertia pipe. According to this arrangement, vibrations in a predetermined frequency band such as the natural frequency of a specific gear, the natural frequencies of an entire drive transmission mechanism, etc., can be reduced dynamically, thereby permitting peaky vibrations to be reduced effectively.

公开(公告)号：DE69531271D1

公开(公告)日：2003-08-21

申请号：DE69531271

申请日：1995-05-26

Applicant: SHARP KK

Inventor： OKADA HIDEO ,  OKUDA TOHRU ,  NISHIKAWA MASAYUKI

IPC: H04N5/225 ,  H04N5/335 ,  H04N5/349 ,  H04N5/376 ,  H04N5/378

Abstract: A refracting plate (1) is installed in the center of an actuator provided with a gimbaling mechanism element (2), which includes rotation supporting portions (2cx), (2cy). A pair of voice coil motors (5x), (5y) are provided for each of the X- and the Y-axis in order to incline the refracting plate (1) about the respective rotation supporting portions (2cx), (2cy), and their own bobbins press the middle parts of the respective sides of the gimbaling mechanism element (2).

公开(公告)号：DE69420795D1

公开(公告)日：1999-10-28

申请号：DE69420795

申请日：1994-07-18

Applicant: SHARP KK

Inventor： YOSHIMOTO AKIHITO ,  OHTSUKA HIDESHI ,  YOSHIDA MITSUNOBU ,  OKUDA TOHRU

IPC: H01F38/14 ,  G11B5/53 ,  H01F38/18

公开(公告)号：NO922011L

公开(公告)日：1992-11-23

申请号：NO922011

申请日：1992-05-21

Applicant: SHARP KK

Inventor： ASAI SHIGEMI ,  OKUDA TOHRU

IPC: G11B5/584 ,  G11B5/29

公开(公告)号：NO921434A

公开(公告)日：1992-10-13

申请号：NO921434

申请日：1992-04-10

Applicant: SHARP KK

Inventor： MURATA KAZUKI ,  KAKIWAKI SHIGEAKI ,  OKUDA TOHRU

IPC: G11B5/584 ,  G11B21/21

CPC classification number: G11B5/584

公开(公告)号：DE69531271T2

公开(公告)日：2004-04-22

申请号：DE69531271

申请日：1995-05-26

Applicant: SHARP KK

Inventor： OKADA HIDEO ,  OKUDA TOHRU ,  NISHIKAWA MASAYUKI

IPC: H04N5/225 ,  H04N5/335 ,  H04N5/349 ,  H04N5/376 ,  H04N5/378

Abstract: A refracting plate (1) is installed in the center of an actuator provided with a gimbaling mechanism element (2), which includes rotation supporting portions (2cx), (2cy). A pair of voice coil motors (5x), (5y) are provided for each of the X- and the Y-axis in order to incline the refracting plate (1) about the respective rotation supporting portions (2cx), (2cy), and their own bobbins press the middle parts of the respective sides of the gimbaling mechanism element (2).

公开(公告)号：DE69325746D1

公开(公告)日：1999-09-02

申请号：DE69325746

申请日：1993-05-19

Applicant: SHARP KK

Inventor： YAMAMOTO TATSUSHI ,  KAKIWAKI SHIGEAKI ,  OKUDA TOHRU ,  OKADA HIDEO ,  TSUJI MASAJI ,  TADERA TAKAMITSU ,  YOSHIMOTO AKIHITO

IPC: G11B15/46 ,  G11B15/50 ,  G11B15/52 ,  G11B15/54

Abstract: A magnetic recording/reproducing apparatus compares speed information obtained by speed detecting means (1) for a magnetic tape (5) with a set travelling speed of the magnetic tape (5) in a control circuit (9), and controls the rotational frequency of a driving motor (6a) for a take-up reel (2), thereby controlling constant-speed travelling of the magnetic tape (5), with employment of no capstan. According to this system, the overall apparatus can be simplified and miniaturized with reduction in weight and cost. Further, it is possible to improve constant-speed travelling performance of the magnetic tape (5) by adjusting resonance and antiresonance appearing due to total equivalent inertia moment related to the magnetic tape (5) and reels (2, 3) in the transfer characteristic of the control system.

公开(公告)号：DE69110702D1

公开(公告)日：1995-08-03

申请号：DE69110702

申请日：1991-02-19

Applicant: SHARP KK

Inventor： IWAMATSU TADASHI ,  YAMAWAKI CHIAKI ,  OKUDA TOHRU

IPC: G11B5/55 ,  G11B5/58 ,  G11B5/584

Abstract: A tracking control device for a magnetic recording/reproducing apparatus arranged in such a manner that a head unit having a plurality of magnetic heads is successively moved in the widthwise direction of a magnetic tape for switching tracking positions so that data recording/reproducing is, by each of the plurality of magnetic heads, performed along a plurality of data tracks formed on the magnetic tape in parallel to a direction in which the magnetic tape moves. The tracking control device has at least two servo signal reproducing heads provided integrally with the head unit and provided for the purpose of reproducing servo signals for tracking use from a plurality of servo tracks formed in parallel to the data tracks on the magnetic tape, and movement control unit for controlling, at each of the tracking positions, movement of the head unit in the widthwise direction in accordance with the difference in two servo signals reproduced by adjacent two of the servo signal reproducing heads corresponded to each of the tracking positions.

公开(公告)号：DE68920921D1

公开(公告)日：1995-03-16

申请号：DE68920921

申请日：1989-07-07

Applicant: SHARP KK

Inventor： OKUDA TOHRU ,  OKADA HIDEO ,  KOYAMA TAKASHI ,  OKADA OSAMU ,  NAKATSUKA MAMORU

IPC: G11B5/10 ,  G11B5/48 ,  G11B15/60 ,  G11B15/62

Abstract: A magnetic recording and reproducing apparatus which includes a tape guide unit (1) including a set of spaced two tape guide substrates (2,3), a spacer (4) provided between the tape guide substrates (2,3) so as to dispose the two tape guide substrates (2,3) through a predetermined distance in approximately a parallel relation to each other, and guide poles (5,6,7) for guiding the surface of a magnetic tape, arranged to extend through front portions of the tape guide substrates (2,3) in a direction generally perpendicular to surfaces of the tape guide substrates, and a plurality of magnetic heads fixed, in a state where their postures are adjusted, to the tape guide unit (1).