Abstract: In a magnetic head assembly wherein each magnetic head is moved along a magnetic recording medium by an arm element coupled to a shaft which has an axis held in a substantially perpendicular relation to a reference plane, an angle adjusting arrangement is coupled to the shaft to adjust an angle between the axis and the reference plane within the substantially perpendicular relation. Preferably, the shaft has a fixed end and a free end adjustable to make the angle between the axis and the reference plane. The angle adjusting arrangement may comprise a pair of electromechanical transducing elements, such as piezoelectric elements, coupled to the free end for use in adjusting the angle. The angle adjusting arrangement may further comprise a leaf spring element between the electromagnetic elements for urging the free end towards a position which the free end has before adjustment of the angle.

Abstract: In a cassette loading apparatus for a video tape recorder equipped with a front loading mechanism, bearing portions of a worm are disposed at predetermined positions in side brackets for supporting a cassette holder which have L-shaped guide holes for guiding the support shaft of the cassette holder in both horizontal and vertical directions, a reference hole is bored on the base of the video tape recorder, a shaft of the worm is inserted through the bearing portions and the reference hole, and the worm shaft keeps constant the axial distance between gears for a cassette loading mechanism and a driving gear for driving the video tape recorder.

Abstract: A carriage movement device for a magnetic memory device having a carriage with a first end and a second end, the carriage being slidably supported on a rod is provided. The carriage movement device has a capstan which is angularly rotated by a driver and a belt having an elongated slot extending form a portion of the belt having the second width, the slot being at least as wide as the first end wrapping around the capstan. A first belt connector connects the first end of the belt to the first end of the carriage. A second belt connector connects the second end of the belt to the second end of the carriage. The second end of the belt is affixed to a second belt connector which is selectively engaged to the second end of the carriage by stretching the belt about the carriage and or deflecting an elastic projection formed on the carriage. The angular rotation of the capstan is accurately converted into linear movement of the carriage.

Abstract: A housing construction of a top loading-type videocassette recorder, comprising a pair of brackets and a cassette holder disposed between the brackets. In the construction, a spring serving as a power source for operating the cassette holder and a damping mechanism for avoiding sudden vertical movement of the cassette holder are placed in a dead space possessed by an opened lid of a tape cassette above the upper surface of the cassette holder, thereby enabling the recorder to be compact and light.

Abstract: A magnetic head device comprises a magnetic head assembly and a holder which is inserted with the magnetic head assembly and has a generally ring shape which is electromagnetically open so as to minimize magnetic induction.

Abstract: A yoke-type magneto-resistive head employs a thin magnetic film structure to bridge a gap in the flux conducting structure of the head and thereby sense magnetic flux. The invention provided means for reducing the magnetic reluctance of the interface between the magnetic film structures and the flux conducting structure of the head, to improve the coupling of magnetic flux from the flux conducting structure to the magnetic film structure and thereby increase the sensitivity of the magneto-resistive head.

Abstract: A cassette ejecting device for a tape recorder or a like apparatus wherein a light and easy cassette ejecting operation can be assured and a returning operation of an ejecting member can be effected assuredly without increasing the ejecting stroke. The device comprises an ejecting member which receives therein a cassette loaded in the device and slidably moves in a cassette holder, a spring receiving member pivoted by an ejecting operation of an ejecting lever, a toggle spring interconnecting the ejecting member and the spring receiving member, and a connecting means interposed between the toggle spring and the spring receiving member. As the toggle spring moves relative to the spring receiving member upon ejecting operation of the ejecting lever, immediately after the toggle spring has reached its dead center line, an end of the toggle spring is moved away from the center of the pivotal movement of the receiving member to quickly return the cassette to its initial cassette loading position.

Abstract: A magnetic head comprises a first magnetic core having a first gap on an exposed surface side; a second magnetic core having a second gap on an exposed surface side forming an identical surface with an exposed surface of the first magnetic core, and disposed in the vicinity of the first magnetic core; and a magnetic film disposed in the vicinity of the second magnetic core and for magnetically short-circuiting a magnetic circuit of the second magnetic core without passing through a coil wound around the second magnetic core. The magnetic film prevents crosstalk to the first magnetic core from the second magnetic core.

Abstract: An apparatus is disclosed having means for shunting demagnetization fields to prevent "magnetostrictive knockdown" of a signal recorded on an isotropic recording medium.

Abstract: A magnetic head comprises a magnetic pole placed at a position to effect a magnetic function to a magnetic recording medium to be driven; a medium supporter which is placed opposing the magnetic pole with respect to the magnetic recording medium with a certain gap between the medium supporter and the magnetic recording medium, and which has a cavity at the portion opposing said magnetic pole and a flat portion having a spread surface area formed around the cavity opposing the magnetic pole; and a fluid supplied to the cavity so that the magnetic recording medium is brought to contact with the magnetic pole by a force of the pressurized fluid from the cavity and is supported by a negative pressure produced at the flat portion.

Abstract: A head shifting device having a movable head carriage mechanism which carries a head is movable to shift the head to a selected position on a record bearing medium. A moving mechanism which is arranged to move the head carriage mechanism is provided with a positioning device, and a restricting device is arranged to change its position in association with the movement of the head carriage mechanism and to restrict the head carriage mechanism at each of the moved positions thereof.

Abstract: A perpendicular magnetic recording and reproducing system records and reproduces a signal on and from a perpendicular magnetic recording medium comprising a magnetic layer which is made from one magnetic material and is constituted by a layer having a low coercivity and a layer having a high coercivity on top of the layer having the low coercivity, by use of a ring core head and utilizes the layer having the low coercivity as a high permeability layer and the layer having the high coercivity as a perpendicular magnetization layer.

Abstract: A magnetic tape cassette, particularly well adapted for high-density recording applications, in which the entry of dust and other contaminants is positively prevented. The cassette includes upper and lower half cases and a slide guard for closing an opening through which the tape can be extracted for recording and reproduction. The slide guard is in the form of a plate and is mounted so as to be slidable forwardly and backwardly of the cassette. A spring is provided to bias the slide guard towards the front end of the cassette. Protrusions are formed on the inner surface of the slide guard so as to be slidably in contact with the outer surface of the lower half case.

Abstract: A magnetic recording apparatus including a base, a drive shaft mounted on the base for rotating a magnetic disc, a movable member adapted to reciprocate in a radial direction of the magnetic disc while holding a magnetic head, the movable member being urged in a first direction; a motor; a gear reduction mechanism including a plurality of gears wherein the plurality of gears and the drive shaft are connected to the motor wherein the rotational direction of the motor is controlled in either forward or reverse operation selectively; a support portion; and a belt mechanism for pulling said movable member in a direction opposite the first direction, one end of the belt being connected to a rotation output portion of the reduction mechanism, an intermediate part of the belt mechanism engaging the movable member and an opposite end of the belt mechanism being fixed to the support portion such that accurate tracking action is attained.

Abstract: An apparatus for recording information on concentric circular recording tracks on a rotatable magnetic recording medium and/or reproducing the information from the recording tracks comprises a magnetic head provided in opposed relationship with the recording medium, a rotatable member, a driving device for intermittently rotating the rotatable member by a predetermined angle, a lever having a pivot shaft and intermittently pivoting in a predetermined direction about the pivot shaft by a unit pivot angle corresponding to the predetermined angle in response to the rotatable member, and a mechanism for intermittently moving the magnetic head in one direction on a straight line passing through the center of rotation of the recording medium in response to the pivoting lever, the head moving mechanism converting the pivotal displacement of the pivoting lever into rectilinear displacement.

Abstract: The cassette tape recorder for the four common types of cassettes according to German Industrial Standards DIN 32 715 T, 32 715 W, and the so-called micro-cassette as well as the mini-M-cassette comprises three sound head carriers (10, 20, 30) adapted to be moved selectively into operating position. Furthermore, the spacing between winding shafts (2,2') is adjustable by a movable cam disc (17). This adjustment is taken care of by cam disc engaging fixtures (23, 33) at the movable sound head carriers (20 and 30, respectively) and by a spring (18) holding the cam disc (17) in an inoperative position against a stop. Likewise provided are adjustable winding heads (3,3') causing different engagement members (4,6) to become effective for the winding drive, the adjustment of the winding heads (3,3') also being effected upon moving of the sound head carriers (10,20,30).

Abstract: A disk recording-reproducing device of the type wherein in response to open/close action of a door the clamp operation against a disk is commenced, which is characterized by a door plate provided on its front end with the door and urged toward the door, a rotary frame supporting slidably the door plate and urged rotatably in the open direction of the door, and a lock plate formed with a notch engagable with a lock portion provided on the door plate at the close time of the door and urged in the engaging direction, whereby a force caused by door opening and locking is not applied unduly to a front panel of the device.

Abstract: Triboelectric charging of magnetic record disk jackets causes static electricity to attract and hold foreign matter. This triboelectric charging can be reduced by the application of nonvolatile, non-integral, electrically conductive organic coatings on the surfaces of the jackets.

Abstract: Disclosed is a recording and/or reproducing apparatus which includes heads of at least two different kinds, carrying apparatus for receiving a recording medium, discriminating apparatus for discriminating the recording medium being carried by the carrying apparatus, selecting apparatus for selecting one kind of head from the different kinds. This occurs in response to the discriminating apparatus and control apparatus which is provided for at least one kind of head selected from different kinds to control head contact with the recording medium in response to the selecting apparatus.

Abstract: A positioning apparatus has a guidance system including first and second bearing means in which a pressure on one side of a guide plate and a height adjustment on its other side to be positioned are sufficient to provide an unambiguous controlled guidance virtually without deviation from the axis of movement of the guide plate. An advantageous construction is provided by a rotary bearing arrangement substantially in the form of an isosceles triangle. A particular mounting pivot point on the bearing support simplifies the assembly of an apparatus having a band drive means. The apparatus is suitable for all types of information recording and playback apparatuses employing disks or disk-shaped media, and also for positioning purposes in robots, etc.