Abstract: A rotary head type magnetic recording/reproducing apparatus having two playback heads A' and B' for verifying the recorded condition after recording on a magnetic tape by two recording/reproducing heads A and B (read-after-write) by which any recording error is found immediately. Two playback heads A' and B' are mounted, respectively, at positions separated by 90.degree. around a rotational center axis relative to the recording/reproducing heads A and B along the head rotating direction. Heads A' and B' are mounted also deviating by a particular dimension relative to the recording/reproducing heads A and B, along a direction perpendicular to the head scanning direction. Since read-after-write is performed immediately after recording, any recording error is found almost simultaneously with recording, by performing read-after-write as in normal reading.

Abstract: In a rotary head drum apparatus having a magnetic head attached to a rotary drum member and connected to a coil of a rotor of a rotary transformer so that a signal is transmitted between the magnetic head and a stationary drum member through the rotary transformer, a resilient contactor is mounted on one of the rotary drum member and the rotor of the rotary transformer, and a contact portion is formed on the other of the rotor and the rotary drum member so as to be contacted by the resilient contactor when the rotary drum and the rotary transformer are assembled with each other. The apparatus further includes an aperture bored through an end face of the stationary drum member and a ground contact pin which is flexible in its radial direction is inserted into the aperture for connecting the stationary drum member to ground.

Abstract: A rotating head wheel for a recorder is displaceable in the direction of its axis of rotation. The displacement is produced by mounting the head wheel on a threaded spindle using a nut arrangement. The spindle rotates in the same direction as the head wheel and its rate of rotation is variable. The nut arrangement includes two nuts disposed along the same axis. A spring, disposed between the two nuts, pushes the nuts in opposite directions. The nuts are capable of moving in the direction of the axis but cannot be twisted relative to each other. In this way, the threads of the nuts make continuous contact with the thread of the spindle to compensate for a backlash between the spindle and the nuts.

Abstract: The present invention relates to an integrated driving system for signal-processing devices, especially video devices (recorders) and other, preferably magnetic pulse recording devices, wherein the device chassis (1) and the mounting provision for at least two motors (20, 21, 22) are formed integrally with each other. The device chassis (1) proper also includes all mounting or bearing bores (e.g. 2, 50, 55) for all mounting shafts (e.g. 4, 8, 18) in a precise positional relation to each other. The bores (2, 50, 55) for all mounting shafts (4, 8, 18) and axles are formed in the metal-cast device chassis (1) in one or more machining operations without the necessity of re-chucking, ensuring that not only the active and passive driving sections of the driving system, but also the reference surfaces and bearing or supporting points are preceisely positioned relative to each other.

Abstract: The rotary head scanner of a helical scan magnetic tape recording/reproducing apparatus includes a carrier which supports the fixed drum or drums of the scanner by means of full radius contact between the drum and the carrier. A rotary head scanner includes upper and lower stationary drums and a head wheel rotably mounted in a slot between the stationary drums. The head wheel includes one or more magnetic heads mounted on the periphery of the head wheel. The rotating heads record on and reproduce from slant tracks on magnetic tape guided around the scanner in a helical path. The upper and lower drums are supported by a carrier which effects full radius contact over a large circumferential arc. Such contact effects rigid mounting of the drums without distortion, thus, minimizing distortion in magnetic tape as it is guided around the rotary head scanner.

Abstract: A head drive for a rotary drum device comprising a plurality of yokes made of magnetic material and magnets housed in the yokes for forming a plurality of magnetic fluxes. A bobbin, comprising a first material surrounds the magnets and has a coil formed on the bobbin. The coil is covered with a second material. At least one circular, non-magnetic leaf spring having an inner periphery and an outer periphery and supported at the outer periphery or the inner periphery by at least one of the yokes and the magnetic means supports the coil. Fixing members, comprising a third material are positioned at the inner periphery of the leaf spring. This third material is positively dissolved and welded to at least one of the first material and the second material with a bonding solvent whereby the leaf spring supports the coil. A prolongation at a portion of the outer periphery of the leaf spring can support a magnetic head.

Abstract: Magnetic transducer-keeper combination embodiments of the invention are described. Each has a magnetic core defining a physical gap and a thin magnetic keeper arranged in close proximity of the core to bridge the gap. A magnetic flux from the gap saturates the keeper inan area bridging the gap, thereby forming a signal transducing zone in the keeper. The keeper is maintained stationary and the core moved or scanned with respect to the same, thereby moving or scanning the transducing zone in the keeper.

Abstract: To assure production of compatible magnetic tracks on magnetic tape, the head wheels of oblique-track tape decks must be height-adjustable. In conventional devices, adjustment of the head wheel height alters the pre-tensioning of the head wheel bearings or the length of the tape loop around the playback device must be chosen unnecessarily large. In the playback device of the present invention, the head wheel motor and head wheel form a unit which is axially shiftable. The pre-tensioning of the bearings is accomplished using a spring device which is supported against an element which rotates with the head wheel axle.

Abstract: Improvement of a lower cylinder of a drum assembly for a helical scan type magnetic recording/reproducing apparatus, a magnetic tape being wrapped around the drum assembly in a predetermined angular range with respect to its own axis which is wider than a scanning angular range so as to have an additional tape-wrapping angular range on at least a tape-entry portion from which the tape starts to be wrapped around the drum assembly. The lower cylinder integrally has on its outer circumferential surface a tape-guiding portion for guiding the tape on wrapping it around the drum assembly, a tape-wrapping portion on which the magentic tape is wrapped along the tape-guiding portion in a direction substantially coincident with a direction of rotation of the upper cylinder and a protruding portion formed in the additional tape-wrapping angular range so as to be protruded by a predetermined amount with respect to the tape-wrapping portion.

Abstract: A magnetic tape apparatus (1) comprises a drive mechanism for driving a magnetic tape (7) and reels (5, 6), a magnetic-head mechanism (9, 10), a buffer mechanism a belt (8) and guide elements (21, 22, 23, 24), which guide the belt (8) in the operational position, which apparatus (1) also comprises a control system for controlling the tape tension, for controlling the position of the belt (8) in the operational phase and for locating a desired part of the tape. The control system comprises a position detection mechanism (38) a tape-tension detection mechanism (44), and a control unit (45) for controlling the reel and tape drive mechanism.

Abstract: A rotary magnetic head drum apparatus is constituted by at least one video head, a rotary drum having a tape running surface and a head mounting surface to which the video head is securely mounted, and a stationary drum provided with a tape guide and a tape running surface. In the rotary magnetic head drum apparatus, the tape running surface or the rotary drum has a lower end portion which is formed with a tapered portion whose diameter becomes gradually smaller along the axis of the rotary drum, and the tapered portion is projected such that its bottom end surface is located below the plane of the head mounting surface.

Abstract: A rotary head mounting device for mounting a rotary head obliquely on a chassis includes one or more oblique bases formed by outsert forming on the chassis. Each of the oblique bases has a mounting surface which is oblique to the chassis for mounting a rotary head thereon and a mounting hole for receiving a screw for fixing the rotary head which mounting hole is formed from the mounting surface into the oblique base vertically with respect to the mounting surface. The rotary head is fixed in its mounting portion to the mounting surface of the oblique bases by screwing the screw into each mounting hole through the mounting portion. The rotary head can be directly mounted on the oblique bases on the chassis without using a separate adaptor so that mounting of the rotary head on the chassis is facilitated. Besides, the mounting device can be made very simply and cheaply by outsert forming the mounting device simultaneously with outsert forming other parts on the chassis.

Abstract: This invention is directed to an improved longitudinal-type rotary head recording system. The improved assembly includes a transducing head carriage mechanism which may be easily accessed for quick and inexpensive replacement of the recording head assembly. In addition, improvements to the head drum assembly are disclosed wherein air gaps, which may form between the head assembly and recording tape are eliminated.

Abstract: A device for guiding a magnetic tape suitable for being wound helically around a cylindrical drum and for running past at least one magnetic head driven in rotation around the periphery of a slot provided in an equatorial plane of the drum, the device being of the type comprising elongate bearing means linked to the drum and defining at least two bearing points against which one of the edges (bottom edge or top edge) of the tape may bear, the device including link means linking the bearing means to the drum and suitable for modifying the inclination of the bearing means as a function of temperature said link means suitable under the effect of differential thermal expansion to cause the bearing means to rotate about a radial axis (extending transversely to the axis of the drum) passing through a point which is invariant in rotation, and whose position is fixed regardless of temperature.

Abstract: A skip-field guard-bandless video tape recorder records and plays back adjacent tracks on a video tape with two closely adjacent heads of opposing head gap azimuth angles (to suppress cross-talk), only during alternate (odd) half-rotations of the head drum. Unavoidable cross-talk of synchronization pulses from adjacent tracks does not create visible interference or timing errors during playback by virtue of a special offset angle .theta..sub.1, between the adjacent recording heads, proportional to the linear offset distance between adjacent tracks. During playback, skipped fields are "filled-in" by a repetition of each recorded field through a second (duplicate) pair of closely adjacent heads of opposing azimuth positioned to retrace the recorded tracks during the other alternate (even) half-rotations of the head drum. An offset angle .theta..sub.2 between the two head pairs (i.e.

Abstract: An automatic tracking speed compensating drive unit 4a for a rotary drum VCR includes a deflection control coil 44 wound around a bobbin 43 mounted to a magnetic yoke assembly 47 by upper and lower spring plates 200, 100. The lower plate has a larger spring constant than the upper plate such that the "softer" upper plate absorbs substantially all thermally induced axial elongations of the bobbin, thereby avoiding tracking errors of a magnetic r/w head 5 mounted on a tab extending outwardly from the "stiffer" lower spring plate.

Abstract: A rotary digital audio tape recorder having a rotary cylinder of a predetermined diameter driven at a predetermined rotation rate, a pair of recording/reproducing heads disposed in proximity of each other on the rotary cylinder, and a magnetic tape kept in contact with the peripheral surface of the rotary cylinder through a predetermined lap angle, wherein a recording or reproducing operation is performed on the magnetic tape with the rotation of the cylinder and the relative motion of the magnetic tape. The rotation rate of the cylinder and the lap angle of the magnetic tape thereto are selectively so set as to retain interchangeability with any magnetic tape recorded or reproduced by a conventional rotary cylinder with two magnetic heads disposed opposite to each other at an angular interval of 180.degree..

Abstract: A multi-channel recording apparatus in which n rotary heads (n is 3 or higher integer) are arranged on the outer peripheral edge of a drum in evenly spaced relation, and a tape-shaped recording medium is trained round the drum over an angular range of at least 360.degree..times.(1-1/n), while recording (n-1) channels of a signal on the recording medium by using the (n-1) of the n heads which are simultaneously tracing on the medium.

Abstract: The present invention is concerned with a helical scan type rotary magnetic head device employed for example in a video tape recorder in which the magnetic tape is caused to run obliquely while it contacts the head and in which recording tracks are formed on the magnetic tape at a predetermined angle of inclination relative to the tape. According to the present invention, the tape guide drum along the side of which the magnetic tape is caused to run while contacting with it has a cut-out at its portion free of contact with the magnetic tape, while a rotary transformer adapted for receiving and transmitting recording and/or reproducing signals at or from a rotary magnetic head is mounted so as to be enclosed within the interior of the tape guide drum to reduce the size and thickness of the rotary magnetic head device.

Abstract: A rotary head apparatus includes magnetic heads on its outer peripheral portion and rotatably supported in a hollow space defined by fixed hollow upper and lower cylindrical drums, a brushless motor stator coil attached to one or the other of the fixed drums, and a brushless motor magnet and yoke, or a first and a second magnets, arranged on the rotary head apparatus on both sides of the stator coil with a gap therebetween.

Abstract: A tape format of 4-mm wide video tape for use in a video tape recorder adopting helical scanning and azimuth recording methods is disclosed in conjunction with a video tape recorder system thereof, which enables the video tape recorder to achieve the greatest size-reduction and improve the resolution in picture reproducing by raising the S/N ratio of video signals. The tape format includes a video width area for an automatic track finding signal to control the traveling of tape and the video signal consisting of color signals and luminance signals, an option track area for recording audio signals, a first guide area for keeping the minimum part of tape in touch with the upper drum, a second guide area for separating the audio signals of the option track area from the video signals of the video width area, and first and second overlap areas respectively below the first guide area and above the second guide area, provided for overlapping the video signals on the edges of video tracks in recording operation.

Abstract: A rotatable magnetic head assembly for use in a magnetic tape recording/play-back device of the helical scanning type, the assembly comprising two diametrically oppositely located magnetic transducing heads (12, 12'). In order to enable recording of a number of tracks simultaneously without the use of a protective band, the heads (12, 12') are constructed and aligned relative to other so that they each form two oblique tracks (38A, 38B) on a magnetic tape (6) and a given intermediate space. At least one track (39A) is formed in the intermediate space by the other head.

Abstract: In a device for loading a tape-like substance, in which the tape-like substance, such as tape, film or the like paid out of a supply reel is conveyed with air to a take-up reel's side through a duct as a tape path having a peripheral path provided along the periphery of a guide drum, a movable guide for leading the tape-like substance together with the air to the beginning of the peripheral path is disposed, so that it can be smoothly operated to load the tape-like substance.

Abstract: A parallel scanning tape recording and/or reproducing apparatus includes a rotary head drum carrying a magnetic head which forms a given length of recording track on a magnetic tape. The magnetic head is designed to be shifted in axial direction at every cycle of recording and/or reproducing operation for forming a plurality of tracks which tracks are axially aligned to form a series of track trains which are formed at mutually different lateral orientation on the magnetic tape. The recording and/or reproducing apparatus is responsive to an operation command which includes an order for deceleration of the magnetic tape to stop, such as a command for reversing the tape drive direction, to temporarily accelerate tape drive speed for avoiding overlapping of axially aligned tracks.

Abstract: A rotary head assembly is provided with a sweeper member upstream of a magnetic head with respect to the direction of feed of magnetic tape which serves to remove dust, grit and so forth from the tape surface. The aforementioned member is provided with a surface lying oblique to the tape axis so as to effectively scrape off the dust, grit and so forth.

Abstract: A rotational magnetic head apparatus comprises a fixed drum, a rotational drum mounted rotatably about the same axis as that of the fixed drum and having an opening formed on the end surface of the rotational drum facing the fixed drum, and a magnetic head provided in the opening. A tape is wound partly around the outer periphery of the fixed and rotational drums so that the tape is caused to travel while the magnetic head slides on the magnetic tape. The position of the magnetic head is selected to be in the center between the opposing surface of the opening facing the fixed drum and the opposing surface of the fixed drum.

Abstract: A rotary magnetic head assembly comprises rotatable and stationary cylinders disposed in confronting relation to each other. A rotary transformer is arranged between the cylinders and includes confronting rotatable and stationary transformer cores fixedly mounted respectively to the rotatable and stationary cylinders. An annular supporting member is located at an outer peripheral surface of the stationary transformer core and includes support portions for supporting the stationary transformer core. Signal transmission junction elements are provided on the outer peripheral portion of the supporting member. The outer peripheral portion of the supporting member is provided with bores through which fixing members are inserted to fix the stationary transformer core to the stationary cylinder.

Abstract: A rotary head type recording apparatus includes a rotary head member having four rotary heads and a rotary erasing head, a rotary transformer member having an erasing coil which is connected to the rotary erasing head and four recording coils which are respectively connected to the four rotary heads, wherein the erasing coil and the four recording coils lie in a common surface of the rotary transformer member and the erasing coil is arranged so that two of the four recording coils are on each side of the erasing coil. A recording device supplies recording signals to the four recording coils to record the recording signals on a recording medium by use of the four recording coils and an erasing device supplies an erasing signal to the erasing coil to erase signals recorded on the recording medium by use of the erasing head.

Abstract: A recording and/or reproducing apparatus employs a azimuth-pair-head in a rotary head drum. The rotary head drum is axially shifted by a head shifting means. First tracks are formed on a magnetic tape during forward driving of the magnetic tape across the rotary head drum. On the other hand, second tracks are formed adjacent to the first tracks during reverse driving across the rotary head drum. Since the first and second tracks are formed by means of the azimuth-pair-head, azimuth gaps thereof will have a different or symmetrical obliquity to each other. This successfully avoids cross-talk between adjacent tracks to allow formation of the first and second tracks in a tightly arranged fashion. As a consequence, high-density longitudinal recording without cross-talk between adjacent tracks becomes possible.

Abstract: Rotary scanner apparatus includes a magnetic head on the periphery of a rotatable headwheel having a central axis of rotation, and an off-axis light source for projecting a collimated beam of information-bearing light obliquely onto a planar photodetector on the axis of the headwheel. To optimize electro-optical "action", and thereby enhance signal-to-noise ratio, optical apparatus, interposed between the light source and the photodetector, has an optical characteristic for shaping the light beam, to cuase the size and shape of its cross section, at a plane of incidence coinciding with the photodetector, to correspond substantially to the size and shape of the light-sensitive surface of the photodetector. Preferably, the optical apparatus includes a prism pair of performing anamorphic beam contraction, to convert the beam shape to circular, in its plane of incidence.

Abstract: Rotatable head support (6) carries at least one magnetic head (7) which scans the tracks of a magnetic tape (1) guided across an arcuate guide surface (5) over an angle smaller than 180.degree.. The angle of inclination (.alpha.) of a head relative to a reference plane (100) is adjustable by a rack (13) and a pinion (15) to enable the tracks (26) to be followed at tape speeds (n.multidot.V.sub.0) which vary relative to a nominal tape speed (V.sub.0). Tape speed detection means (22) derive a control signal used to adjust the angle of inclination (.alpha.) in conformity with a formula containing the playback factor (n) and other parameters in order to enable a comparatively high tape speed (n.multidot.V.sub.0) to be used, starting from a specific maximum acceptable tracking error.

Abstract: A strip of easily magnetizable material of low remanence, having magnetic properties equal to or better than those of the core of the magnetic heads on a revolving headwheel of a video tape machine is provided as a magnetic shunt for each head, disposed in the neighborhood of the core gap, but spaced therefrom at a distance much greater than the gap width, for reducing the spread of stray flux when the head is used for recording and intercepting stray flux from other heads when the head is in the playback mode. Among the many ways in which the shunt can be provided are individual bridge strip mounted on the headwheel to bridge over each head laterally, a horseshoe-shaped strip covering the annular gap in which the headwheel revolves for the portions of that gap over which the tape passes, but spaced away from the tape, and strips mounted on the stationary guide drums or embedded in the headwheel periphery.

Abstract: A rotary magnetic head device for use with a magnetic recording an/or reproducing apparatus, such as a digital audio tape recorder (DAT) or a video tape recorder (VTR), includes a chassis, a fixed shaft secured to the chassis and a drum unit consisting of an upper drum fixed to the upper end of the fixed shaft and a lower rotary drum rotatably mounted by means of a bearing device on the fixed shaft between the upper drum and the chassis. A rotary transformer consisting of an upper fixed core and a lower rotary core is disposed in a recess formed in the lower side of the fixed upper core. The lower core is attached to the lower rotary drum and carries a head attachment plate carrying in turn a magnetic head. The magnetic tape is wrapped about the drum unit over a prescribed wrapping angle. As the lower drum is rotated by an associated driving device, signals may be recorded on or reproduced from the magnetic tape by the magnetic head kept in frictional contact with the running tape.

Abstract: A magnetic recording reproduction device is disclosed, in which the rotation axis of the motor is disposed substantially parallelly to the base plate and the diameter of the drum holding rotary heads is reduced to a half of that utilized heretofore, owing to a construction of the tape driving system, by which the tape is wound around the drum after having been bent approximately by 90.degree. and twisted approximately by 90.degree..

Abstract: A rotary head assembly for use in a helical-scan magnetic recorder-reproducer includes a pair of magnetic head tips of single-crystal ferrite mounted on an axial end of a rotatable cylinder in substantially diametrically opposite relation to each other, each of the magnetic head tips having two tip members joined to each other through a mating interface and a surface for sliding contact with a magnetic tape. A body of a rigid adhesive is applied to an end of the mating interface remote from the surface. The rigid adhesive is highly rigid and substantially nonelastic for suppressing vibration. The rigid adhesive body attached to the magnetic head tip suppresses vibration of the magnetic head tip to reduce noise produced by the sliding contact between the magnetic head tip and the magnetic tape. The rigid adhesive body increases the rigidty of the magnetic head tip.

Abstract: A rotary head type reproducing apparatus for reproducing information signals recorded in a plurality of recording tracks by tracing, with rotary type magnetic heads, the recording tracks which are formed on a tape-shaped magnetic record bearing medium in a direction of crossing the longitudinal direction of the medium comprises: pairs of magnetic heads which are positioned in the vicinity of each other with each pair of heads arranged to have different azimuth angles from each other; a rotary member arranged to have the pairs of magnetic heads mounted on the circumference thereof; rotation period detecting means arranged to detect the rotation period of the rotary member and to produce a rotation period information signal corresponding to the rotation period detected; and output selection means for selectively producing, according to the rotation period information signal, the information signals reproduced from the recordng tracks by the pairs of magnetic heads through their tracing action on the tape-shaped

Abstract: In a device for loading a tape-like element, such as, a magnetic tape, film or the like, in an apparatus having supply and take-up reels which are disposed side-by-side with their axes substantially horizontal in a normal operating position of the apparatus, and a guide drum located under the supply reel in such normal operating position; a generally zig-zag path for the tape-like element is provided with an inlet adjacent the supply reel for receiving the tape-like element paid out from the latter and an outlet arranged near to the take-up reel, such path includes a supply side path portion extending from the inlet to a peripheral path portion around at least a part of the periphery of the guide drum and a take-up side path portion extending from the peripheral path portion to the outlet, the supply side, peripheral and take-up path portions have respective lower wall sections facing upwardly in the normal operating position of the apparatus, and air under pressure is introduced into the path of the tape-lik

Abstract: A rotating head wheel for a recorder wherein the head wheel is additionally displaceable in the direction of its axis of rotation. The displacement is produced by mounting the head wheel on a threaded spindle which rotates in the same direction as the head wheel and whose rate of rotation is variable.

Abstract: A magnetic recording apparatus of a helical scanning system comprises a rotary cylinder (13), recording heads (A and B) and an erase head (10) attached to slightly project from a rotating surface (13a) of the cylinder (13). The rotary erase head (10) has a gap (4) comprising a ferrite core half (1) and a Sendust film (3) formed on a ferrite core half (2) opposed to the ferrite core half (1) and having a larger saturation magnetic flux density. In addition, the recording heads (A and B) and the rotary erase head (10) are attached on the rotary cylinder (13) so that an end (P1) located forward with respect to the tape travelling direction (11) of the Sendust film (3) may trace the backward side with respect to the tape travelling direction (11), apart by a distance which is a half of the gap length of the rotary erase head (10), as compared with a forward end (Q) of a recorded track pattern ( 15a) formed on a tape (14) by the recording head (A) scanning immediately after erasing by the rotary erase head (10).

Abstract: A magnetic tape apparatus for recording of data, including two spaced apart tape guides for guiding a movable magnetic tape therebetween, the portion of the tape between the tape guides being in tension, magnetic heads between the guides for scanning the tape, and a main tape drive which selectively moves the tape continuously in a path which includes a segment extending between the guides past the magnetic heads, the tape guides and magnetic heads being shiftable relative to each other independently of the main tape drive for longitudinally shifting the portion of the tape between the tape guides relative to the magnetic heads.

Abstract: Helical scan tape recorder/playback apparatus includes a pair of concave air-bearing surfaces disposed immediately adjacent and tangential to opposing sides of a circumferential surface of a rotary head scanner, to cooperatively form a path for guiding magnetic tape past the head scanner at a predetermined angle other than zero degrees. A vacuum source serves to evacuate air from the vicinity of each air-bearing surface to create an air pressure gradient the effect of which is to cause magnetic tape to ride on a thin film of air interposed between the tape and each air-bearing surface during transport of the tape from a supply reel to a take-up reel.

Abstract: A helical scan head drum assembly includes upper and lower drums having an aligned guide surface. The upper and lower drums can be easily separated from each other to install or replace a head support between the drums, and reassembled without loss of alignment of the circumferential guide surface. Each drum has three positioning elements formed in a wall portion, arranged such that the positioning elements of the two drums engage each other pairwise to form a statically defined alignment of the two drums. The fixing element presses the two drums together at the location of the positioning elements to fix them in place.

Abstract: A tracking indication system of a VCR to make a recognition to a user whether or not a precise tracking of a video head is achieved. The invention includes a peak value detecting and holding circuit for detecting and holding in a predetermined time a peak value of the reproduction output signals, a level shift circuit for lowering an output of said peak value detecting and holding circuit to a predetermined level, a LPF for filtering the reproduction output signal, a differential amplifier whose a non-inverting terminal is connected to an output of said level shift circuit and an inverting terminal is connected to an output of said LPF to amplify a difference voltage between output signals of said level shift circuit and said LPF, and a LED which is activated or deactivated by a transistor being closed or open in response to an output signal of said differential amplifier.

Abstract: Disclosed is a rotary magnetic head device for a magnetic recording/reproducing apparatus including image signal transmitters. A dynamic pressure type bearing is provided on one of a rotary member and a stationary member, for generating a dynamic pressure to maintain a gap between the signal transmitters constant.

Abstract: In a recording and/or reproducing apparatus for a magnetizable tape, such as a VCR, having a cylindrical scanning unit about which a length of tape can be wrapped, electromagnetic shielding is provided by a shielding enclosure for the scanning unit and a shielding box for an amplifier connected to the unit by a shielded cable. The shielding box and the shielding enclosure share a common wall portion arranged between the scanning unit and the amplifier. The common wall portion is preferably arranged perpendicular to the cylindrical scanning unit axis, and has an end of the scanning unit shaft passing through an opening for engagement by a leaf spring connected to the common wall portion.

Abstract: A tape guide arrangement for a tape recording and reproducing apparatus comprises a cylinder device provided with a rotary head, a first slant guide member for feeding a tape to the cylinder device, a second slant guide member for guiding the tape from the cylinder device into a predetermined direction, a first rotary guide member for guiding the tape to the first slant guide member, and a second rotary guide member for causing the tape from the second slant guide member to pass through a predetermined position. Each of the first and second rotary guide members is provided with an axis of rotation substantially perpendicular to an imaginary plane defined in relation to positions which are set on the first and second slant guide members and the cylinder device, respectively, and through which an elongated edge of the tape passes.

Abstract: A tape guide drum incorporates a rotary drum, has a lead portion on its outer circumferential surface, and has a rotating axis inclined with respect to a reference surface. The first and second guide pins are arranged at the sides of the tape guide drum so as to wrap a magnetic tape around the drum, and are inclined with respect to the reference surface. The first and second guide pins are arranged so that the magnetic tape enters and exits the drum at elevation angles with respect to the lead portion. The wrap central point of the tape around the tape guide drum is spaced apart from a plane including first and second contact points between the first and second guide pins and the central line of the magnetic tape.

Abstract: A vertical magnetic recording and playback apparatus in which a magnetic tape is transported between a main and an auxiliary magnetic poles of a vertical magnetic head for recording and reproducing information into and out of the tape. The magnetic head is integrally mounted on rotary members. Guide members guide the tape such that the tape is transported in a flat position between the main and auxiliary magnetic poles of the head. In this configuration, the transport of the tape between the main and auxiliary magnetic poles is uncomplicated and the path of tape, simple.

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: The magnetic tape guiding cylinder device includes a rotatable upper cylinder; a fixed lower cylinder opposed to the upper cylinder and having a cylindrical member integrally formed with and penetrating through a bottom plate at one end of the lower cylinder which is remoter from the upper cylinder, the cylindrical member being provided with bearings at both axial end portions; a drive shaft rotatably supported by the lower cylinder via the bearings to drive the upper cylinder, the cylindrical member being grasped by a chuck during finishing operation of the lower cylinder. The device is particularly characterized in that the cylindrical member is formed with a circular groove along the outer circumference between the bottom plate and one of the axial end portions which is remoter from the upper cylinder.