公开(公告)号：JP2002050097A

公开(公告)日：2002-02-15

申请号：JP2001170662

申请日：2001-06-06

Applicant: SONY CORP

Inventor： HASEGAWA SHINICHI ,  TAKAMIZAWA YOSHITO ,  SHIMADA MITSUHIRO

IPC: G11B15/61 ,  H02K7/14 ,  H02K21/24

Abstract: PROBLEM TO BE SOLVED: To provide a drum unit for rotary head configured so that the quantity adjustment of mass eccentricity can be easily performed in the state in which the whole rotating body part is built up. SOLUTION: A molded weight fixing member 34a formed with weight fixing holes 34c having a slit 34d in a position where the quantity adjustment of mass eccentricity can be performed from the outside of the drum unit 1 for rotary head is disposed on the back yoke 34 of a motor 30. Thereby, the insertion of a weight 34b for quantity adjustment of mass eccentricity into the weight fixing member 34a is facilitated.

公开(公告)号：JPH06259703A

公开(公告)日：1994-09-16

申请号：JP4409193

申请日：1993-03-04

Applicant: SONY CORP

Inventor： TAKAMIZAWA YOSHITO

IPC: G11B5/02 ,  G11B5/53

Abstract: PURPOSE:To miniaturize a rotary head drum, to reduce the signal loss, and to easily actualize a multichannel in the compact drum. CONSTITUTION:A connector 4 provided with a cylindrical casing 5, a contact pin 7 and a coil spring 8 is arranged between a connection part 2 of a head base 33 and a transformer substrate. The connector 4 is directly connected to a land forming a terminal for the connection part 2 and for the transformer substrate. By this arrangement, the constitution is simplified, and the setting space is reduced, then the rotary head drum is produced at a low cost and in a small size. Since a setting space of the connector 4 is reduced, the plural connectors 4 can be arranged even in the compact drum, and the multichannel is easily actualized in the compact drum. Further, the signal route is shortened as compared with the case of conventional soldering, and the signal loss is reduced.

公开(公告)号：JPH0793731A

公开(公告)日：1995-04-07

申请号：JP23996893

申请日：1993-09-27

Applicant: SONY CORP

Inventor： HASEGAWA SHINICHI ,  TAKAMIZAWA YOSHITO ,  SHIMADA MITSUHIRO

IPC: G11B5/52

Abstract: PURPOSE:To adjust the deviated centroid quantity of an arbitrary quantity with good accuracy by making it possible not to adjust the deviated centroid with the member alone but to adjust the deviated centroid over the entire part of a rotating body in the state of assembling the device. CONSTITUTION:A spherical weight 34b is lightly press fitted into a weight fixing hole 34c of a weight fixing member 34a made of a mold disposed on a back yoke 34 after the rotary head drum device is assembled. As a result, the deviated centroid of the rotating body is made adjustable.

公开(公告)号：JPH05325346A

公开(公告)日：1993-12-10

申请号：JP15011392

申请日：1992-05-19

Applicant: SONY CORP

Inventor： OSHIMA EIJI ,  TAKAMIZAWA YOSHITO

IPC: G11B15/61 ,  G11B5/127 ,  G11B5/53 ,  G11B25/06 ,  H04N5/782

Abstract: PURPOSE:To improve quality and to reduce cost. CONSTITUTION:A motor part 19 is disposed between a rotating drum 5 and a fixed drum 6, and a head drum 3 is received and positioned on a drum base 2 by three receiving surfaces 16 which are provided at nearly equal positions by setting the rotary shaft 4 of the head drum 3 as center 4a. Thereafter, one screw 11 is tightened near the rotary shaft 4 and the head drum 3 is fixedly attached on the drum base 2.

公开(公告)号：JPH05325150A

公开(公告)日：1993-12-10

申请号：JP13394292

申请日：1992-05-26

Applicant: SONY CORP

Inventor： TAKAMIZAWA YOSHITO ,  OSHIMA EIJI

IPC: G11B5/52

Abstract: PURPOSE:To obtain a thin, downsized rotary magnetic head drum unit in which a high torque is realized and so-called 'judder' of yoke board is suppressed remarkably, without employing a magnet material having a high coercive force in the yoke board or increasing power, by a constitution wherein a motor stator is interposed between the yoke board made of a laminate of a viscoelastic magnet and a yoke board rotating in synchronism with a motor rotor and the magnet of the motor rotor. CONSTITUTION:A motor stator 3 is interposed between a yoke board 2 made of a laminate of a viscoelastic magnet 10 and a yoke board 2 rotating in synchronism with a motor rotor 4 and the magnet of the motor rotor 4.

公开(公告)号：JP2001243610A

公开(公告)日：2001-09-07

申请号：JP2000055049

申请日：2000-02-29

Applicant: SONY CORP

Inventor： TAKAMIZAWA YOSHITO ,  SATO SHUICHI

IPC: G11B33/12 ,  G11B5/02 ,  G11B5/53

Abstract: PROBLEM TO BE SOLVED: To rotate a rotary drum in a stable state by connecting a magnetic head with a rotary transformer section without using any solder. SOLUTION: This device is provided with a fixed drum 4 having a fixed shaft 5 attached thereto, a rotary drum 3 rotatably attached to the fixed drum 4 and having a magnetic head 17 attached in its outer periphery, a rotary transformer section 31 disposed between the fixed drum 4 and the rotary drum 3, an attaching part 67 attached to the rotary drum 3, and a connecting part 68 formed integrally with the attaching part 67 and having its end part facing the disposing surface of the first coil 32 of the rotary drum 3. A leaf spring connecting terminal 69 to be pressed into contact with the contact point of the magnetic head 17 is provided in the attaching part 67, a contact part 78, with which a leaf spring connecting terminal 43 connected to the first coil 32 is brought into contact, is provided in the end part of the connecting part 68, and a connecting member 66 is provided for connecting the magnetic head 17 with the first coil 32.

公开(公告)号：JPH07161004A

公开(公告)日：1995-06-23

申请号：JP34082393

申请日：1993-12-08

Applicant: SONY CORP

Inventor： TAKAMIZAWA YOSHITO

IPC: G11B5/53 ,  G11B5/02

Abstract: PURPOSE:To reduce transmission loss of a signal by using a head contact for connecting a rotary transformer with the magnetic head. CONSTITUTION:Under the state of contacting individual contact pieces 29 of the head contact 26 with individual connecting parts on an upper surface of the rotary side 21 of the rotary transformer, a supporting body 27 of the head contact 26 is fixed to the upper surface of the rotary side 21 by sticking it, for instance, with an adhesive. When a rotary drum 9 is fitted to a flange 8, under the state of contacting each individual contact piece 30 with each individual contact part of a head terminal plate 24 of each magnetic head, the rotary drum 9 is fitted. Then, a signal is given and received between the rotary transformer 19 and each magnetic head through the rotary side 21 of the transformer 19, each contact piece 30 of the head contact 26 and each head terminal plate 24. Consequently, since the transformer 19 and the head are electrically connected via the contact 26, the signal transmission route is shorter than the conventional case using a relay plate, and the transmission loss of the signal is reduced.