Mitsumi Electric Company Ltd.

Teruo Shimazu

Yoshihide Majima

Toshiharu Shimizu

Toshimitsu Itoh

Yoshihiro Okano

Tsuneo Uwabo

Yoshinori Tangi

Eiichi Yoneyama

Azuma Miyazawa

Yoshihiko Maejima

Toshio Edamoto

In a recording/reproducing device for use in recording and reproducing data on and from a recording medium while moving read/write head means relative to the recording medium in a moving direction, which comprises a carriage supporting the read/write head means and guided by a guiding member in the moving direction, and a voice coil motor comprising a voice coil and a magnetic circuit device for driving the carriage in the moving direction. The carriage has a coil holding portion by which the voice coil is fixedly held in the condition that the coil axis is arranged in the moving direction. The voice coil is applied with a driving electric current for driving the carriage. The magnetic circuit device is fixedly disposed adjacent to the voice coil to generate a magnetic field intersecting the driving current flowing through the voice coil, the voice coil moving in the moving direction together with the carriage by an interaction of the driving current and the magnetic field.

Recording/reproducing device with read/write head carriage supporting voice coil of voice coil motor for driving the carriage assembly

Recording/reproducing device with read/write head carriage supporting

In a high-density FDD for driving a magnetic disk medium of an FD inserted thereinto, a switch unit 50 detects whether the inserted FD is a large-capacity FD or a small-capacity FD. A control device 60 is connected to the switch unit 50, a control device 60 controls drive of a spindle motor 100 so as to rotate the spindle motor 100 at a high rotation speed when the inserted FD is identified as a large-capacity FD, and so as to rotate the spindle motor 100 at a low rotation speed when the inserted FD is identified as a small-capacity FD.

Control method for a high-density type FDD capable of automatically

A flexible disk drive includes a carriage spaced from a main frame and holding a magnetic head, a pair of guide bars for guiding the carriage, rubber dampers fixed on each of the guide bars at both axial end portions thereof, and a linear motor for moving the carriage in a given radial direction of a flexible disk. When the linear motor excessively in the carriage in the given radial direction, the rubber dampers work to stop the carriage in a manner so as to prevent a shock.

Magnetic recording/reproducing device having head carriage with shock

In a magnetic recording/reproducing device, a voice coil motor includes a voice coil and a magnetic circuit for producing a magnetic field intersecting the electric current flowing through the voice coil. The voice coil motor drives a carriage holding a magnetic head. A flexible printed circuit is disposed adjacent to the voice coil for feeding the electric current to the voice coil and sending signals to and from the magnetic head. Between the voice coil and the flexible printed circuit is interposed a magnetic shield for preventing to noise from influencing the flexible printed circuit upon feeding the electric current to the voice coil.

Magnetic recording/reproducing device with magnetic shield between voice

A magnetic recording/reproducing device which incorporates a lift arm and presser assembly, wherein the lift arm and presser assembly includes a lift arm holding a magnetic head, a carriage attached with the lift arm which is movable relative to the carriage, and a lift arm pressing spring attached to the carriage for pressing the lift arm. The lift arm pressing spring presses the lift arm at a position closer to the magnetic head than to a middle point between the magnetic head and a center portion of the lift arm.

Magnetic recording/reproducing device having a magnetic head and a lift

A flexible disk drive includes a magnetic head carriage, a linear motor for moving the carriage, and a carriage locking mechanism for locking the carriage in response to ejecting action of a flexible disk from the flexible disk drive. A lever unit has an ejecting lever and a locking lever. The ejecting lever is a part of an ejecting mechanism for ejecting the flexible disk from the flexible disk drive. The locking lever is disposed in the vicinity of the carriage, and locks the carriage from movement after the flexible disk is ejected from the flexible disk drive by the ejecting lever. The lever unit is made of non-magnetic material such as resin as one body.

Flexible disk drive having head carriage locking mechanism

A push-button type tuning apparatus comprises a frame consisting of a front side plate part, a rear side plate part, right and left side plate parts, and a bottom plate part, a coil case fixedly provided on the frame, a plurality of guiding members at least having one end fixed to the front side plate part of the frame and extending towards the rear side plate part, a slider capable of sliding under the guide of said guiding members provided on the guiding members, a rotatable member axially supported at both side plate parts in a rotatable state, and a plurality of push-button assemblies arranged and provided in the frame. The frame is formed from a single plate member by unitarily bending the front and rear side plate parts and the right and left side plate parts at four sides of the bottom plate part.

Push-button type tuning apparatus

A push-button type tuning apparatus comprises a frame, a plurality of push-button assemblies each having a push-button on one end thereof, and inserted into and supported by the frame, where the push-button assembly is slidable in the pushing direction between a non-operational position and an operational position, a cam member provided on the frame, where the cam member is slidable in a direction perpendicular to the pushing direction of the push-button assembly, and a tuner provided on the frame, where the tuner is tuned according to the sliding quantity of the cam member. The push-button assembly further has a memory piece which has a V-shaped cam portion, where the memory piece is rotatably supported in the vicinity of the open portion of the V-shaped cam portion in a state in which the vertex of the V-shaped cam portion faces towards the direction of the push-button, and locking means for locking the memory piece at a desired rotated position. The cam member further has a projecting cam portion provided on the inner side of the V-shaped cam portion of the memory piece. Moreover, the V-shaped cam portion of the memory piece which is in the locked state, makes contact with and pushes against the projecting cam portion of the cam member upon sliding of the push-button assembly in the operational position, and guides the projecting cam portion to the vertex of the V-shaped cam portion to slide the cam member in the perpendicular direction with respect to the pushing direction of the push-button assembly.

A push button type tuning apparatus comprising a plurality of push buttons adapted to be pressed at the time of preset tuning and retuning operations, memory plates provided rotatably with respect to each of the push buttons, clamp plates provided with respect to each of the push buttons and adapted to clamp the memory plates through preset tuning manipulation, a slide plate adapted to slide in connection with a tuning part on manual tuning or retuning by the push buttons, and comparators pivotally supported on the push plate to which the push button are fixed and having position-restriction parts, the position-restriction parts restricting the memory plate to a position registered with the slide plate on preset tuning, and restricting the slide plate to a position registered with the memory plate after it has been clamped on retuning. A journal-bearing part of the memory plate comprises a round pin and a hole having the shape of, for example, a triangle in which the pin is to be fitted, and the journal-bearing part is manitained stably with the pin making contact with the sides of the hole at two different points.

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Atsugi, Japan

Teruo Shimazu