Matsushita Electric Industrial Co., Ltd.

Masashi Omura

Hiroshi Inoue

Hidehito Uemura

Hiromichi Inomata

Junichi Sakamoto

Kaoru Matsuoka

Shigeo Obata

Hiroshi Kanchiku

Kisaburo Kurobe

Keisuke Tomoishi

Hiroshi Moriyama

Eisaku Sakoda

According to the present invention, a hollowed portion is formed on a lower bonded surface of a rotary drum to which a rotation-side rotary transformer is bonded, and a hollowed portion is formed on an upper bonded surface of the fixed drum to which a fixation-side rotary transformer is bonded. Thus, excessive adhesive is absorbed by the hollowed portions and adhesive layers do not have uneven thicknesses, thereby securing surface runout accuracies of the rotary transformers. Further, since an adhesive is applied to the outer peripheral side of the hollowed portion of the rotary drum, the adhesive does not flow into ball bearings located on the inner peripheral side.

Rotary head drum device having hollow portions in bonding surfaces for adhesively bonding rotary transformers thereto and method for manufacturing the same

According to the present invention, a cylindrical side wall is provided in a housing so as to surround an outer periphery of a stopper member. Further, an end surface of the side wall is higher than a top surface of outermost periphery of the stopper member. Oil otherwise scattered is received by the side wall for collection. Oil is thus prevented from scattering even if during manufacturing, the amount of oil dripped between the shaft and the oil-impregnated bearing is not strictly controlled, so that a slightly excessive amount of oil is dripped. Therefore, the present motor device enables manufacturing operations to be favorably performed, and is reliable having a long lifetime.

Motor device

In order to not only obtain excellent sound quality in a long-time recording mode not less than five times a standard recording mode by preventing, without narrowing a track pitch of a high-fidelity head, the high-fidelity head from tracing the third sound track from a target sound track as well as excellent picture quality free from crosstalk from an adjoining video track of a target video track but enable special playback without using a field memory in a video tape recorder, one head pair in conventional double azimuth type four heads for the standard recording mode and a threefold recording mode is used for video recording in the long-time recording mode and a head pair having a head width smaller than a width of a recording track is used exclusively for video playback in the long-time recording mode.

Video tape recorder

In order to allow lubricant to move from the outside into the inside of a thrust bearing easily, an escape is provided in a base and a circumferential recess in a plate. As a result, a hub with magnetic disks mounted thereon can rapidly float up in a correct position at start-up of rotation thereby to perform correct recording and reproduction of information.

Spindle motor unit having hydrodynamic bearing

A spindle motor unit having a hydrodynamic bearing that retains a necessary amount of lubricant in the thrust bearing even when rotating and stopping operations are frequently repeated, and ensures reliability of the bearing, and allows correct recording and reproducing operations is obtained by reducing the clearance formed between the inner diameter surfaces and of base and the outer diameter surface of flange

A hydrodynamic bearing spindle motor comprising: a fixed member which has a radial bearing portion; a rotational member; a rotary shaft which is rotatably supported by the radial bearing portion of the fixed member and is secured to a substantially central location of the rotational member so as to extend in a vertical direction of the hydrodynamic bearing spindle motor such that the rotational member is disposed above the fixed member; lubricant which is provided between the radial bearing portion of the fixed member and the rotary shaft; a projection which is provided on a lower face of the rotational member so as to be disposed radially outwardly of the rotary shaft and has an oblique inner periphery expanding gradually radially outwardly towards a distal end of the projection; a lubricant receiving member which is secured to an upper face of the fixed member so as to be disposed radially outwardly of the projection; and oil repellent for repelling the lubricant, which is applied to the projection and its vicinity; wherein the lubricant receiving member is provided at a location to which the lubricant repelled by the oil repellent and scattered from the projection through rotation of the rotational member adheres.

Growing community of inventors

Hyogo, Japan

Masashi Omura