Cathode ray tube magnetic reproducer for video

Claim 2

An electromagnetic reproducing head comprising a source of primary electrons, an elongated target, means for establishing a stream of said primary electrons from said source to said target, means for sweeping said stream of primary electrons across the length of said elongated target, and means for channeling the magnetic fields of a lengthy magnetized medium traveling in close proximity to said target for interaction between the magnetized medium and said stream of primary electrons, said target having means for collecting substantially exclusively said stream of primary electrons after interaction thereof with said magnetized medium to generate an electric output signal in accordance with said interaction.

Claim 3

An electromagnetic reproducing head comprising a source of primary electrons, an elongated target, means for establishing a beam of primary electrons from said source and cyclically sweeping across the length of said target, means for accommodating a lengthy magnetized medium in close proximity to said target for interaction between the magnetic fields of said medium and said beam of primary electrons, and means for electrically detecting the effect of said medium on said beam of primary electrons, said target including a plurality of high permeability wires spaced along the length of said target, and said detecting means being adjacent said wires and collecting substantially exclusively said beam of primary electrons after interaction thereof with the magnetic fields defined by said wires.

Claim 4

An electromagnetic reproducing head comprising a source of primary electrons, an elongated target, means for establishing a beam of primary electrons from said source and cyclically sweeping across the length of said target, means for accommodating a lengthy magnetized medium in close proximity to said target for interaction between the magnetic fields of said medium and said beam of primary electrons, and means for electrically detecting the effect of said medium on said beam of primary electrons, said target including a plurality of high permeability wires spaced along the length of said target, and said detecting means being adjacent said wires and collecting substantially exclusively said beam of primary electrons after interaction thereof with the magnetic fields defined by said wires.

Claim 5

An electromagnetic reproducing head comprising a source of primary electrons, an elongated target, means for establishing a beam of said primary electrons from said source and cyclically sweeping across the length of said target, means for accommodating a lengthy magnetized medium in close proximity to said target for interaction between the magnetic fields of said medium and said beam of primary electrons, and means for electrically detecting the effect of said medium on said beam of primary electrons, said electrically detecting means including collector plates on either side Of said target, and in the path of the beam of primary electrons for collecting substantially exclusively said primary electrons.

Claim 6

An electromagnetic reproducing head comprising a source of primary electrons, an elongated target, means for establishing a beam of said primary electrons from said source and cyclically sweeping across the length of said target, means for accommodating a lengthy magnetized medium in close proximity to said target for interaction between the magnetic fields of said medium and said beam of primary electrons, and means for electrically detecting the effect of said medium on said beam of primary electrons, said electrically detecting means including collector plates on either side Of said target, and in the path of the beam of primary electrons for collecting substantially exclusively said primary electrons.

Claim 7

An electromagnetic reproducing head comprising a source of primary electrons, an elongated target, means for establishing a beam of said primary electrons from said source and cyclically sweeping across the length of said target, means for accommodating a lengthy magnetized medium in close proximity to said target for interaction between the magnetic fields of said medium and said beam of primary electrons, and means for electrically detecting the effect of said medium on said beam of primary electrons, said target including a plurality of high permeability wires spaced along the length of said target, and said electrically detecting means including collector plates on either side of said target for collecting substantially exclusively said primary electrons to electrically reproduce the magnetized medium.

Claim 8

An electromagnetic reproducing head comprising a source of primary electrons, an elongated target, means for establishing a beam of said primary electrons from said source and cyclically sweeping across the length of said target, means for accommodating a lengthy magnetized medium in close proximity to said target for interaction between the magnetic fields of said medium and said beam of primary electrons, and means for electrically detecting the effect of said medium on said beam of primary electrons, said target including a plurality of high permeability wires spaced along the length of said target, and said electrically detecting means including collector plates on either side of said target for collecting substantially exclusively said primary electrons to electrically reproduce the magnetized medium.

Claim 9

An electromagnetic reproducing head comprising a source of electrons, an elongated target, means for establishing a beam of electrons from said source and cyclically sweeping across the length of said target, means for moving a lengthy magnetized medium in close proximity to said target for interaction between the magnetic fields of said medium and said beam of electrons, and means for electrically detecting the effect of said medium on said beam, said electrically detecting means including collector plates on either side of said target, and said beam of electrons being of such width to impinge on said collector plates as well as said target.

Claim 10

An electromagnetic reproducing head comprising a source of electrons, an elongated target, means for establishing a beam of electrons from said source and cyclically sweeping across the length of said target, means for moving a lengthy magnetized medium in close proximity to said target for interaction between the magnetic fields of said medium and said beam of electrons, and means for electrically detecting the effect of said medium on said beam, said electrically detecting means including collector plates on either side of said target, and said beam of electrons being of such width to impinge on said collector plates as well as said target.

Claim 11

An electromagnetic reproducing head comprising a source of electrons, an elongated target, means for establishing a beam of electrons from said source and cyclically sweeping across the length of said target, means for accommodating a lengthy magnetized medium in close proximity to said target for interaction between the magnetic fields of said medium and said beam of electrons, and means for electrically detecting the effect of said medium on said beam, said electrically detecting means including collector plates on either side of said target, and said beam of electrons being of such width to impinge on said collector plates as well as said target, and baffle plates limiting the width of said beam reaching said collector plates.

Claim 12

An electromagnetic reproducing head comprising a source of electrons, an elongated target, means for establishing a beam of electrons from said source and cyclically sweeping across the length of said target, means for accommodating a lengthy magnetized medium in close proximity to said target for interaction between the magnetic fields of said medium and said beam of electrons, and means for electrically detecting the effect of said medium on said beam, said electrically detecting means including collector plates on either side of said target, and said beam of electrons being of such width to impinge on said collector plates as well as said target, and baffle plates limiting the width of said beam reaching said collector plates.

Claim 13

An electromagnetic reproducing head comprising a source of electrons, an elongated target, means for establishing a beam of electrons from said source and cyclically sweeping across the length of said target, means for moving a lengthy magnetized medium in close proximity to said target for interaction between the magnetic fields of said medium and said beam of electrons, and means for electrically detecting the effect of said medium on said beam, said electrically detecting means including collector plates on either side of said target, and said beam of electrons being of such width to impinge on said collector plates as well as said target, said target including a plurality of high permeability wires spaced along the length of said target.

Claim 14

An electromagnetic reproducing head comprising a source of electrons, an elongated target, means for establishing a beam of electrons from said source and cyclically sweeping across the length of said target, means for moving a lengthy magnetized medium in close proximity to said target for interaction between the magnetic fields of said medium and said beam of electrons, and means for electrically detecting the effect of said medium on said beam, said electrically detecting means including collector plates on either side of said target, and said beam of electrons being of such width to impinge on said collector plates as well as said target, said target including a plurality of high permeability wires spaced along the length of said target.

Claim 15

An electromagnetic reproducing head comprising a source of electrons, a target having secondary electron emission properties, means for establishing a beam of electrons from said source to said target, means for establishing a stream of secondary electrons emitted from said target, and means for accommodating a lengthy magnetized medium in close proximity to said target for interaction between the magnetized medium and said streams of electrons, characterized in that the establishing means for establishing said stream of secondary electrons directs said stream of secondary electrons exclusively to one side of the beam of electrons from said source to said target, and an evacuated branch tube extending from the target generally rearwardly at an acute angle relative to the beam of electrons and having an electrode therein for collecting said secondary electrons to electrically reproduce the magnetized medium.

Claim 16

An electromagnetic reproducing head comprising a source of electrons, a target having secondary electron emission properties, means for establishing a beam of electrons from said source to said target, means for establishing a stream of secondary electrons emitted from said target, and means for accommodating a lengthy magnetized medium in close proximity to said target for interaction between the magnetized medium and said streams of electrons, characterized in that the establishing means for establishing said stream of secondary electrons directs said stream of secondary electrons exclusively to one side of the beam of electrons from said source to said target, and an evacuated branch tube extending from the target generally rearwardly at an acute angle relative to the beam of electrons and having an electrode therein for collecting said secondary electrons to electrically reproduce the magnetized medium.

Claim 17

AN electromagnetic reproducing head comprising a source of primary electrons, an elongated target, means for establishing a beam of said primary electrons from said source and cyclically sweeping across the length of said target, means for accommodating a lengthy magnetized medium in proximity to said beam of primary electrons for interaction between the magnetic fields of said medium and said beam of primary electrons, and means for electrically detecting substantially exclusively the effect of said medium on said beam of primary electrons to electrically reproduce the magnetized medium. 10 An electromagnetic reproducing head comprising a source of primary electrons, an elongated target, means for establishing a beam of said primary electrons from said source and cyclically sweeping across the length of said target, means for accommodating a lengthy magnetized medium in proximity to said beam of primary electrons for interaction between the magnetic field of said medium and said beam of primary electrons, means for electrically detecting the effect of said medium on said beam of primary electrons, and means for channeling said magnetic fields of said medium for interaction with said beam of primary electrons including a grid of high permeability members extending across the path of said beam of primary electrons, said electrically detecting means being on the opposite side of the grid from said source and collecting substantially exclusively said primary electrons and providing an output signal in accordance with the interaction of the magnetic fields of said medium with said beam of primary electrons.

Claim 18

AN electromagnetic reproducing head comprising a source of primary electrons, an elongated target, means for establishing a beam of said primary electrons from said source and cyclically sweeping across the length of said target, means for accommodating a lengthy magnetized medium in proximity to said beam of primary electrons for interaction between the magnetic fields of said medium and said beam of primary electrons, and means for electrically detecting substantially exclusively the effect of said medium on said beam of primary electrons to electrically reproduce the magnetized medium. 10 An electromagnetic reproducing head comprising a source of primary electrons, an elongated target, means for establishing a beam of said primary electrons from said source and cyclically sweeping across the length of said target, means for accommodating a lengthy magnetized medium in proximity to said beam of primary electrons for interaction between the magnetic field of said medium and said beam of primary electrons, means for electrically detecting the effect of said medium on said beam of primary electrons, and means for channeling said magnetic fields of said medium for interaction with said beam of primary electrons including a grid of high permeability members extending across the path of said beam of primary electrons, said electrically detecting means being on the opposite side of the grid from said source and collecting substantially exclusively said primary electrons and providing an output signal in accordance with the interaction of the magnetic fields of said medium with said beam of primary electrons.

Claim 19

An electromagnetic reproducing head comprising a source of electrons, an elongated target, means for establishing a wide beam of electrons, of greater width than thickness, from said source and cyclically sweeping across the length of said target, means for channeling the magnetic fields on a lengthy magnetized medium for interaction between the magnetic fields of said medium and said beam of electrons, and means for electrically detecting the effect of said magnetic fields on said beam, said establishing means comprising baffle plates extending parallel to the target at each side thereof with the beam impinging on both of said baffle plates, and the portion of the beam flowing between the baffle plates having said greater width thereof determined by the spacing of said baffle plates.

Claim 20

An electromagnetic reproducing head comprising a source of electrons, an elongated target, means for establishing a wide beam of electrons, of greater width than thickness, from said source and cyclically sweeping across the length of said target, means for channeling the magnetic fields on a lengthy magnetized medium for interaction between the magnetic fields of said medium and said beam of electrons, and means for electrically detecting the effect of said magnetic fields on said beam, said establishing means comprising baffle plates extending parallel to the target at each side thereof with the beam impinging on both of said baffle plates, and the portion of the beam flowing between the baffle plates having said greater width thereof determined by the spacing of said baffle plates.

Claim 21

An electromagnetic reproducing head comprising a source of electrons, an elongated target, means for establishing a beam of electrons from said source and cyclically sweeping across the length of said target to define an incident beam path, means for channeling the magnetic fields on a lengthy magnetized medium for interaction between the magnetic fields of said medium and said beam of electrons at a region of interaction, and means for electrically detecting the effect of said magnetic fields on said beam, said establishing means comprising electron beam intercepting means adjacent said target and upstream thereof intercepting a portion of the beam to maintain the width of the beam reaching said target substantially constant regardless of small variations in the path of the beam as it flows from said source toward said target, and said detecting means being on the side of said intercepting means away from said source and receiving predominantly said beam of electronics as it travels along said incident beam path after traversing said region of interaction.

Claim 22

An electromagnetic reproducing head comprising a source of electrons, an elongated target, means for establishing a beam of electrons from said source and cyclically sweeping across the length of said target to define an incident beam path, means for channeling the magnetic fields on a lengthy magnetized medium for interaction between the magnetic fields of said medium and said beam of electrons at a region of interaction, and means for electrically detecting the effect of said magnetic fields on said beam, said establishing means comprising electron beam intercepting means adjacent said target and upstream thereof intercepting a portion of the beam to maintain the width of the beam reaching said target substantially constant regardless of small variations in the path of the beam as it flows from said source toward said target, and said detecting means being on the side of said intercepting means away from said source and receiving predominantly said beam of electronics as it travels along said incident beam path after traversing said region of interaction.

Claim 23

An electromagnetic reproducing head comprising a source of electrons, an elongated target, means for establishing a beam of electrons from said source and cyclically sweeping across the length of said target, means for channeling the magnetic field on a lengthy magnetized medium for interaction between the magnetic fields of said medium and said beam for electrons, and means for electrically detecting the effect of said magnetic fields on said beam, said channeling means comprising a grid of high permeability members with each member extending generally parallel to each other and lying in a common plane and across the path of said beam with the beam sweeping in a plane generally at right angles to said common plane of said members, said detecting means being on the side of said grid remote of said source and directly collecting said beam of electrons from said source and thereby producing an electrical output signal in accordance with the magnetization of said medium.

Claim 24

An electromagnetic reproducing head comprising a source of electrons, an elongated target, means for establishing a beam of electrons from said source and cyclically sweeping across the length of said target, means for channeling the magnetic field on a lengthy magnetized medium for interaction between the magnetic fields of said medium and said beam for electrons, and means for electrically detecting the effect of said magnetic fields on said beam, said channeling means comprising a grid of high permeability members with each member extending generally parallel to each other and lying in a common plane and across the path of said beam with the beam sweeping in a plane generally at right angles to said common plane of said members, said detecting means being on the side of said grid remote of said source and directly collecting said beam of electrons from said source and thereby producing an electrical output signal in accordance with the magnetization of said medium.

Claim 27

A transducer mechanism comprising an elongated transducer device having a plurality of magnetic circuits each with at least two nonmagnetic gaps, means for accommodating an elongated magnetizable medium across one of said gaps of each magnetic circuit, electronic stepping switch means utilizing primary electrons exclusively for sequentially linking with the other of said gaps of each magnetic circuit, and electric circuit means for conducting a video signal operatively connected with said electronic stepping switch means for sequential linking with the other of said gaps of said transducer device, said magnetizable medium having a video signal recorded thereon for linking said one gap of each magnetic circuit and for producing a corresponding magnetic field in said other of said gaps of each magnetic circuit, whereby said electric circuit means is energized with the video signal recorded on said magnetizable medium.

Claim 28

A transducer mechanism comprising an elongated transducer device having a plurality of magnetic circuits each with at least two nonmagnetic gaps, means for accommodating an elongated magnetizable medium across one of said gaps of each magnetic circuit, electronic stepping switch means utilizing primary electrons exclusively for sequentially linking with the other of said gaps of each magnetic circuit, and electric circuit means for conducting a video signal operatively connected with said electronic stepping switch means for sequential linking with the other of said gaps of said transducer device, said magnetizable medium having a video signal recorded thereon for linking said one gap of each magnetic circuit and for producing a corresponding magnetic field in said other of said gaps of each magnetic circuit, whereby said electric circuit means is energized with the video signal recorded on said magnetizable medium.

Claim 29

An electromagnetic reproducing head comprising means for establishing a stream of primary electrons, means for cyclically deflection said stream of primary electrons to establish an elongated scanning region, means for channeling the magnetic fields on a lengthy magnetized medium for interaction with said stream of primary electrons in said scanning region, and means for detecting the effect of said magnetic fields on said stream of primary electrons substantially exclusively by collecting substantially only said primary electrons to produce an electrical output signal in accordance with the magnetization of said medium.

Claim 30

An electromagnetic reproducing head comprising means for establishing a stream of primary electrons, means for cyclically deflection said stream of primary electrons to establish an elongated scanning region, means for channeling the magnetic fields on a lengthy magnetized medium for interaction with said stream of primary electrons in said scanning region, and means for detecting the effect of said magnetic fields on said stream of primary electrons substantially exclusively by collecting substantially only said primary electrons to produce an electrical output signal in accordance with the magnetization of said medium.

Claim 33

In combination, a system comprising: a. a magnetized elongated magnetic tape record medium having an active exterior surface and having a record track of substantial length and width exhibiting a residual magnetization in a predetermined general direction in accordance with a recorded image, the residual magnetization of said record track in accordance with said recorded image producing external magnetic fields at said active exterior surface of said tape record medium varying in amplitude along the length of said record track and varying in amplitude along the width of said record track in accordance with said recorded image, b. moving means for continuously moving said tape record medium at substantially a constant speed along a record medium path including a record medium path region of limited longitudinal extent where said active exterior surface of said tape record medium conforms substantially to a record medium path region plane over the entire transverse extent of said record track, c. an evacuated envelope having an evacuated interior and having record medium coupling means for receiving said active exterior surface of said tape record medium in sliding contact therewith, said record medium coupling means transmitting the external magnetic fields of an incremental portion of the length of the record track to the interior of said evacuated envelope, said incremental portion of the length of the record track representing a line segment of said recorded image, and the magnetic fields from said line segment where they are of substantially maximum strength within the interior of the envelope lying predominantly in a magnetic field region and in a transverse plane disposed substantially at right angles to said record medium path region plane and disposed transversely to the direction of movement of said record medium along said record medium path, d. means comprising a source of primary electrons within said envelope for supplying primary electrons and for directing said primary electrons toward and through said magnetic field region with the primary electrons traveling generally at right angles to the magnetic fields where they are of substantially maximum strength within the interior of the envelope as the primary electrons traverse said magnetic field region so that the respective primary electrons are deflected in accordance with the magnitude of said magnetic fields at the respective points of traverse of said magnetic field region by the respective primary electrons, e. means comprising an electrically conductive surface at the interior of said envelope adjacent said magnetic field region which surface is maintained at an electric potential to repel said primary electrons for tending to reverse the component of electron velocity which lies substantially parallel to said transverse plane and substantially perpendicular to said record medium path region plane so that the primary electrons move along respective incident electron paths with said velocity component thereof which is substantially parallel to said transverse plane being directed toward said magnetic field region, and move along respective departing electron paths with said velocity component thereof which is substantially parallel to said transverse plane being directed away from said magnetic field region, f. cyclically operating deflection means for causing the primary electrons produced at successive instants of time in each cycle thereof to scan respective points along said magnetic field region and thereby to produce a sequential scanning of the incremental portion of the length of said record track at said path region in said cycle, the duration of each cycle of said deflection means being sufficiently short in relation to said speed of said record medium so that successive line segments of the recorded image signal are scanned by said primary electrons during operation of said system, g. collecting means in said envelope disposed for collecting said primary electrons after travel thereof through said magnetic field region and providing an electrical output which is a function of the deflection of said primary electrons by the magnetic fields of the record medium at said magnetic field region, and said collecting means in operation of said system providing a time varying electric signal comprising a series of signal lines corresponding to successive line segments of said recorded image on said magnetic tape record medium, and h. said maGnetic field region being relatively close to that portion of the exterior of said envelope which is occupied by the incremental length of the record track being scanned at a given instant of time, in comparison to one-half of each of the cross-sectional dimensions of said envelope, and said magnetic coupling means extending from said incremental length to said magnetic field region and being of corresponding relatively small dimension with respect to the direction substantially parallel to said transverse plane and substantially perpendicular to said record medium path region plane in comparison to one-half of each of the cross-sectional dimensions of said envelope.

Claim 34

In combination, a system comprising: a. a magnetized elongated magnetic tape record medium having an active exterior surface and having a record track of substantial length and width exhibiting a residual magnetization in a predetermined general direction in accordance with a recorded image, the residual magnetization of said record track in accordance with said recorded image producing external magnetic fields at said active exterior surface of said tape record medium varying in amplitude along the length of said record track and varying in amplitude along the width of said record track in accordance with said recorded image, b. moving means for continuously moving said tape record medium at substantially a constant speed along a record medium path including a record medium path region of limited longitudinal extent where said active exterior surface of said tape record medium conforms substantially to a record medium path region plane over the entire transverse extent of said record track, c. an evacuated envelope having an evacuated interior and having record medium coupling means for receiving said active exterior surface of said tape record medium in sliding contact therewith, said record medium coupling means transmitting the external magnetic fields of an incremental portion of the length of the record track to the interior of said evacuated envelope, said incremental portion of the length of the record track representing a line segment of said recorded image, and the magnetic fields from said line segment where they are of substantially maximum strength within the interior of the envelope lying predominantly in a magnetic field region and in a transverse plane disposed substantially at right angles to said record medium path region plane and disposed transversely to the direction of movement of said record medium along said record medium path, d. means comprising a source of primary electrons within said envelope for supplying primary electrons and for directing said primary electrons toward and through said magnetic field region with the primary electrons traveling generally at right angles to the magnetic fields where they are of substantially maximum strength within the interior of the envelope as the primary electrons traverse said magnetic field region so that the respective primary electrons are deflected in accordance with the magnitude of said magnetic fields at the respective points of traverse of said magnetic field region by the respective primary electrons, e. means comprising an electrically conductive surface at the interior of said envelope adjacent said magnetic field region which surface is maintained at an electric potential to repel said primary electrons for tending to reverse the component of electron velocity which lies substantially parallel to said transverse plane and substantially perpendicular to said record medium path region plane so that the primary electrons move along respective incident electron paths with said velocity component thereof which is substantially parallel to said transverse plane being directed toward said magnetic field region, and move along respective departing electron paths with said velocity component thereof which is substantially parallel to said transverse plane being directed away from said magnetic field region, f. cyclically operating deflection means for causing the primary electrons produced at successive instants of time in each cycle thereof to scan respective points along said magnetic field region and thereby to produce a sequential scanning of the incremental portion of the length of said record track at said path region in said cycle, the duration of each cycle of said deflection means being sufficiently short in relation to said speed of said record medium so that successive line segments of the recorded image signal are scanned by said primary electrons during operation of said system, g. collecting means in said envelope disposed for collecting said primary electrons after travel thereof through said magnetic field region and providing an electrical output which is a function of the deflection of said primary electrons by the magnetic fields of the record medium at said magnetic field region, and said collecting means in operation of said system providing a time varying electric signal comprising a series of signal lines corresponding to successive line segments of said recorded image on said magnetic tape record medium, and h. said maGnetic field region being relatively close to that portion of the exterior of said envelope which is occupied by the incremental length of the record track being scanned at a given instant of time, in comparison to one-half of each of the cross-sectional dimensions of said envelope, and said magnetic coupling means extending from said incremental length to said magnetic field region and being of corresponding relatively small dimension with respect to the direction substantially parallel to said transverse plane and substantially perpendicular to said record medium path region plane in comparison to one-half of each of the cross-sectional dimensions of said envelope.