USRE39029E1 - Magnetic recording/reproducing apparatus with the recording/reproducing heads preceding the erasing heads - Google Patents

Magnetic recording/reproducing apparatus with the recording/reproducing heads preceding the erasing heads Download PDF

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Publication number
USRE39029E1
USRE39029E1 US10/349,954 US34995403A USRE39029E US RE39029 E1 USRE39029 E1 US RE39029E1 US 34995403 A US34995403 A US 34995403A US RE39029 E USRE39029 E US RE39029E
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United States
Prior art keywords
recording
reproducing
erasing
heads
head
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US10/349,954
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English (en)
Inventor
Kouhei Baba
Haruo Ohta
Hideaki Mukae
Jun Takeuchi
Haruo Isaka
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Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US08/937,303 external-priority patent/US5953482A/en
Application filed by Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to US10/349,954 priority Critical patent/USRE39029E1/en
Application granted granted Critical
Publication of USRE39029E1 publication Critical patent/USRE39029E1/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
    • G11B5/52—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with simultaneous movement of head and record carrier, e.g. rotation of head
    • G11B5/53—Disposition or mounting of heads on rotating support
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B15/00—Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function
    • G11B15/02—Control of operating function, e.g. switching from recording to reproducing
    • G11B15/12—Masking of heads; circuits for Selecting or switching of heads between operative and inoperative functions or between different operative functions or for selection between operative heads; Masking of beams, e.g. of light beams
    • G11B15/125—Masking of heads; circuits for Selecting or switching of heads between operative and inoperative functions or between different operative functions or for selection between operative heads; Masking of beams, e.g. of light beams conditioned by the operating function of the apparatus
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
    • G11B5/52—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with simultaneous movement of head and record carrier, e.g. rotation of head
    • G11B5/53—Disposition or mounting of heads on rotating support
    • G11B5/531—Disposition of more than one recording or reproducing head on support rotating cyclically around an axis
    • G11B5/534—Disposition of more than one recording or reproducing head on support rotating cyclically around an axis inclined relative to the direction of movement of the tape, e.g. for helicoidal scanning
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B15/00—Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function
    • G11B15/18—Driving; Starting; Stopping; Arrangements for control or regulation thereof
    • G11B15/46—Controlling, regulating, or indicating speed
    • G11B15/467—Controlling, regulating, or indicating speed in arrangements for recording or reproducing wherein both record carriers and heads are driven
    • G11B15/4673—Controlling, regulating, or indicating speed in arrangements for recording or reproducing wherein both record carriers and heads are driven by controlling the speed of the tape while the head is rotating
    • G11B15/4675—Controlling, regulating, or indicating speed in arrangements for recording or reproducing wherein both record carriers and heads are driven by controlling the speed of the tape while the head is rotating with provision for information tracking
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/008—Recording on, or reproducing or erasing from, magnetic tapes, sheets, e.g. cards, or wires
    • G11B5/00813—Recording on, or reproducing or erasing from, magnetic tapes, sheets, e.g. cards, or wires magnetic tapes
    • G11B5/00847—Recording on, or reproducing or erasing from, magnetic tapes, sheets, e.g. cards, or wires magnetic tapes on transverse tracks
    • G11B5/0086—Recording on, or reproducing or erasing from, magnetic tapes, sheets, e.g. cards, or wires magnetic tapes on transverse tracks using cyclically driven heads providing segmented tracks

Definitions

  • This invention relates to a magnetic recording/reproducing apparatus for recording audio signals and video signals.
  • the RF circuit In a video tape recorder (VTR), transmission of a signal between a magnetic head and RF circuit is made through rotary transformers.
  • the RF circuit may be carried on the cylinder.
  • the RF circuit includes a recording amplifier, a reproducing amplifier, an equalizer and the like.
  • simultaneous playback function and insert-editing function are essential in order to ensure the editing performance.
  • a recording head, a reproducing head and an erasing head are required to be disposed on the cylinder.
  • the simultaneous playback function is a function to perform recording and reproduction simultaneously, which is necessary for confirming a recorded state or performing editing.
  • head-arrangement It is general to dispose a plurality of heads at equal intervals peripherally of the cylinder in order to make sure of good head-to-tape contact and easy signal processing.
  • the head-to-tape contact indicates contact condition of head and tape.
  • disposing a plurality of heads at equal intervals peripherally of the cylinder is to arrange them equlangularly on the cylinder. In this case, however, when the tape winding angle is 180 degrees, two heads in pair or Ach (channel) head and Bch head are disposed so as to make an angle of 180 degrees with each other on the cylinder or diametrically oppositely disposed thereon.
  • VCR business-purpose video cassette recorder
  • the erase timing and the record timing are difficult to be set so as to satisfy the editing accuracy by applying such a conventional method that uses a PG signal from the cylinder (a rotational phase detecting signal of the cylinder), an FG signal from the motor (rotational frequency control signal of the motor), and a control signal from the linear track.
  • An object of this invention is to provide a magnetic recording/reproducing apparatus capable of realizing following functions with a VTR of narrow track-pitch recording by a small cylinder as: (1) a simultaneous playback function, (2) editing functions such as insert-editing and (3) a reproduction compatible function to any tape recorded in the long play mode with a different track-pitch (or, with further narrow track-pitch).
  • a magnetic recording apparatus of this invention comprises: a rotary cylinder for winding thereon a video tape over an angle of substantially 180°; first and second recording heads mounted on the rotary cylinder at positions apart from each other by 180° in a rotating direction of the rotary cylinder for recording on the video tape first-channel and second channel video signals, respectively; and first and second erasing heads mounted on the rotary cylinder at positions apart from each other by 180° in the rotating direction of the rotary cylinder for erasing first-channel and second channel video signals, respectively recorded on the video tape, wherein the first recording head and the first erasing head are disposed adjacent to each other in the rotating direction of the rotary cylinder, and the second recording head and the second erasing head are disposed adjacent to each other in the rotating direction of the rotary cylinder.
  • a magnetic recording and reproducing apparatus of this invention comprises: a rotary cylinder; a recording head mounted on the rotary cylinder; an erasing head mounted on the rotary cylinder; a reproducing head mounted on the rotary cylinder; a first rotary transformer disposed on a first core and coupled to the recording head; a second rotary transformer disposed on the first core and coupled to the erasing head; a third rotary transformer disposed on a second core and coupled to the reproducing head; and a conduct shielding member disposed between the third rotary transformer and the first and second rotary transformers.
  • FIG. 1 is a diagram showing a head arrangement of a magnetic recording/reproducing apparatus according to an embodiment of this invention.
  • FIG. 2 is a cross-sectional diagram of a cylinder for explaining a rotary transformer construction according to the embodiment of this invention.
  • FIG. 3 is a diagram showing a helical track pattern and a head scanning according to the embodiment of this invention.
  • FIG. 4 is a schematic diagram showing an operational timing of each head on an Ach side when insert-editing an audio data region 22 shown in FIG. 3 .
  • FIG. 5 is a block diagram of a magnetic recording/reproducing apparatus according to the embodiment of this invention.
  • FIG. 6 is a diagram showing a head arrangement of recording heads and erasing heads looking from a direction of a cylinder rotation or a horizontal direction.
  • FIG. 7 is a diagram showing a head arrangement of the recording heads and the erasing heads looking from a head height direction.
  • a magnetic recording/reproducing apparatus will be described on in relation to its operation when insert-editing, circuit structure in response to a simultaneous recording and reproduction, and reproduction compatible function to the long-time recording format in this order.
  • a tape winding angle is substantially 180 degrees and a number of a recording channel is one (1), which means that it is not of the multi-channel system recording but of the one-channel system recording.
  • FIG. 1 is a diagram showing a head arrangement of a magnetic recording/reproducing apparatus of this embodiment.
  • a recording head 1 and an erasing head 2 , and a recording head 4 and an erasing head 5 of a same channel are adjacently disposed to each other on a same head-base.
  • the recording heads are each is disposed so as to precede a corresponding erasing head with respect to a direction of cylinder rotation.
  • reproducing heads are disposed so as to make an angle of substantially 90 degrees respectively with adjacently disposed recording/erasing heads which are oppositely disposed so as to make an angle of 180 degrees.
  • FIG. 2 is a cross-sectional diagram of a cylinder for explaining a rotary transformer construction of this embodiment.
  • a rotary transformer 7 for reproduction use is disposed separately from a rotary transformer 11 for recording and erasing use.
  • an upper rotary cylinder 9 capable of becoming an electroconductive shield member is provided and an electroconductive shield member 8 is also provided beneath the rotary transformer 7 for reproduction use.
  • FIG. 3 is a diagram showing a helical track pattern and a head scanning pattern.
  • one helical track has four data regions consisting of a track information data region, an audio data region, a video data region and an additional data region followed by a gap region G disposed in this order from a top thereof.
  • the track information data region includes the track information for identifying specification of a trackwidth, data for a tracking use and data for an inserting use to be used as a standard when areas where audio, video and additional data are recorded are respectively detected.
  • the additional data region is a region where data other than audio and video data are written.
  • the gap region G is a region that is provided for preventing the data region before and after the targeted region from being erased even after recording or during insert-editing by providing unrecording regions respectively between adjacent data regions. (Refer to “Home-use digital VTR, the present television signal standards are strengthened first”, by Ide and Kanohta, Nikkei Electronics Book pp. 137-150, published on Oct. 1, 1993 from Nikkei BP Corporation.)
  • the recording head width is expressed as HWrec
  • the reproducing head width is expressed as HWpb
  • the erasing head width is expressed as HWer
  • the relation as HWpb, HWer>Tp2 ⁇ HWrec may be obtained.
  • the relation between the reproducing head width HWpb and erasing head width HWer does not impose particular limitation on the relation between the reproducing head width HWpb and erasing head width HWer.
  • FIG. 4 is a schematic diagram showing the operational timings of each head on the Ach side when the audio data region 22 shown in FIG. 3 is insert-edited.
  • a recording signal is received from an input terminal 23 and supplied through a recording system signal processor 24 to a recording amplifier 25 and a recording amplifier 26 .
  • the recording system signal processor 24 converts the input signal into an optimal signal to be recorded and supplied to the recording amplifier 25 and recording amplifier 26 at a predetermined timing.
  • the signal supplied to the recording amplifier 25 is sent through a switching circuit 27 to the recording head 1 at the desired recording timing and recorded on a tape 56 .
  • the signal supplied to the recording amplifier 26 is sent through a switching circuit 28 to the recording head 4 at the desired recording timing and recorded on the tape 56 .
  • the recording head 1 and the recording head 4 are used for recording in general and functional as reproducing heads, respectively, in a part of the track when editing and recording and reproducing simultaneously, or in the all tracks when compatibly reproducing the tape having been recorded in the long play mode.
  • the switching circuits 27 and 28 are for switching the recording heads 1 and 4 between recording and reproducing sides, respectively. In case that the switching circuits 27 and 28 are switched to the reproducing side, the signals are sent through a reproducing amplifier 29 and a reproducing amplifier 30 and a head switching circuit 31 to a reproducing system signal processor 32 .
  • the head switching circuit 31 is controlled by the head switching signal supplied from an input terminal 39 .
  • the reproducing system signal processor 32 processes the signal from the reproducing amplifiers to output to an output terminal 32 , and during editing and simultaneous recording and reproducing operations, supplies the track information data 55 to a timing generator 34 and at the same time, supplies a control signal 54 to a tracking controller 57 .
  • the tracking controller 57 is to track each head basically by the control signal 54 generated from the reproduced signal by the recording head when recording (including editing and simultaneous recording and reproducing) and compatibly reproducing of the long play mode, and by a control signal 53 generated from the reproduced signal by the reproducing head when normally reproducing.
  • the timing generator 34 supplies record timing signals 46 , 47 and 48 to the recording system signal processor 24 , the recording amplifier 25 and the recording amplifier 26 , respectively, in response to the track information data single signal 55 and a mode identification signal received from the input terminal 58 . Also, the timing generator 34 supplies the switching circuits 27 and 28 with recording/reproducing mode switching control signals 49 and 50 , respectively. Furthermore, the timing generator 34 supplies the erasing amplifiers 36 and 38 with erase timing signals 51 and 52 , respectively. Referring to the erasing system, erasing signals generated by erase frequency oscillators 35 and 37 are amplified by erasing amplifiers 36 and 38 and supplied to the erasing heads 2 and 3 5 at the desired erase timing, respectively.
  • reproduced signals reproduced through the reproducing heads 3 and 6 from the tape 56 are supplied respectively through reproducing amplifiers 40 and 41 to a head switching circuit 42 .
  • the reproduced signal switched by a head switching signal supplied from an input terminal 45 is processed through a reproducing system signal processor 43 and supplied to an output terminal 44 .
  • the reproducing system signal processor 43 supplies the control signal 53 to the tracking controller 57 .
  • FIG. 6 is a diagram of the head arrangement of the recording head and erasing head looking from the direction of cylinder rotation, or from the horizontal direction.
  • the recording head 1 and the erasing head 2 are disposed with a gap X therebetween on the same head base.
  • the gap X is provided by giving consideration to the rise time of erasing current and the fact that erasing heads of the same channel (Ach) and opposite channel (Bch) both do not go into the region necessary to be erased of the helical track while the track information region at the top of the helical track is being reproduced by the recording head (for example, Ach).
  • FIG. 7 is a diagram of the head arrangement of the recording head and erasing head looking from the head height direction.
  • the erasing head is disposed so as to have a relative height Y (about 2 ⁇ Tp2) in order to precede by two tracks on the tape pattern to the recording head.
  • the recording heads are disposed so as to precede the erasing heads with respect to the direction of cylinder rotation and, as shown in FIG. 3 , the track information data region 20 of two tracks before of the erasing head 2 (namely, two tracks before of the edit-object track to be erased) is reproduced by the recording head 1 narrower in head width than the reproducing head 6 thereby to attain the erase timing setting and high accuracy tracking.
  • the track information data region is not renewed when insert-editing.
  • the operation in this case is explained by referring to FIG. 5 .
  • the track information data 20 reproduced by the recording head 1 is supplied through the reproducing amplifier 29 to the reproducing system signal processing circuit 32 .
  • the reproducing system signal processing circuit 32 supplies the track information data to the timing generator 34 and the control signal 54 to the tracking controller 57 .
  • the timing generator 34 determines the erase timing of the erasing head 2 and the playback switch timing of the switching circuit 27 in response to the track information data signal.
  • An example of the operational timing of this case is shown in FIG. 4 .
  • the erase timing setting and the tracking of this case are based on the track information data of two tracks before of the edit-object track to be erased, and the recording head 1 and the erasing head 2 , as shown in FIG. 6 , are adjacently disposed on the same head base 60 , so that the erase timing setting and the tracking can be carried out at a high accuracy.
  • the track just after insert-recording can be prevented from being erased by the erasing head having wider head width.
  • the track information data region 21 of the edit-object track to be recorded is reproduced by the recording head 1 , so that the recording timing setting and tracking can be carried out at a high accuracy.
  • the erasing heads are disposed and structured so as not to go into the region necessary to be erased of the helical track nor to be supplied with the erasing current, so that the crosstalk from the erasing head can be prevented during the time period when the track information data region is being reproduced by the recording head.
  • the reproducing head s are disposed so as to make an angle of substantially 90 degrees respectively with adjacently disposed recording/erasing heads which are oppositely disposed so as to make an angle of 180 degrees with each other.
  • it is effective to take a distance from the recording head and erasing head.
  • it is important to take the largest possible distance between the reproducing head and recording/erasing heads.
  • the distance from both the recording and erasing heads can be maximized by disposing the recording and erasing head so as to be adjacent to each other and the reproducing heads so as to make an angle of 90 degrees therewith.
  • the electromagnetic coupling between the transformers can be reduced, so that the crosstalk to the reproducing system can be reduced.
  • the upper rotary cylinder 9 capable of becoming an electroconductive shield member is provided and the electroconductive shield member 8 is provided beneath the rotary transformer 7 for the reproducing use, so that the crosstalk between the transformers can be further reduced.
  • FIG. 3 is a diagram of VTR of a format of track-pitch Tp 2 having the recording heads and reproducing heads on the cylinder.
  • the recording head in order to enhance the recording density of VTR having the same diameter, same lead angle and same winding angle, the recording head is employed for reproduction when reproducing the track having guardbandless recording with the long-time format of track-pitch Tp 1 (Tp 1 ⁇ Tp 2 ).
  • the width of the recording head is set so as to track on the track of the track-pitch Tp 1 .
  • the simultaneous recording and reproduction can be attained by maximizing the distance between the reproducing head and the recording/erasing heads and at the same time, by applying such a shield measure that the rotary transformer for the reproducing use is disposed independently at the upper portion of the cylinder. Furthermore, the erase/record timing setting and tracking when editing (particularly when insert-editing) are made possible by providing the optimum arrangement of the recording/erasing heads. Besides, with the reproducing function by the recording head, the reproduction compatible function to the long-time recording format recorded at a narrower track-pitch by the cylinder having the same diameter and same lead angle can be realized.
  • the rotary transformer was made of the periphery-to-periphery type (coaxial type), but not limited thereto, a face-to-face type (plane type) one may be used for this purpose.
  • the rotary transformer 7 for the reproducing use and the rotary transformer 11 for the recording/erasing use each does not have particular limitation upon the gap between the rotor and the stator, however, it is needless to say that if the gap in the rotary transformer 7 for the reproducing use is made larger than that in the rotary transformer 11 for the recording/erasing use, the allowable accuracy of the mechanism in assembling cylinder can be further reduced.
  • the short-ring 13 was inserted into the rotary transformer 7 for the reproducing use, but not limited thereto, it is needless to say that if the inter-channel crosstalk can be held without inserting the short-ring in the transformer having an equivalent or less-opposite length, the short-ring does not need to be used.
  • the number of recording channels was made one (1), but not limited thereto, it is needless to say that if the number of recording channels is made N (N>1), the same effect can be obtained.
  • the crosstalks from the recording and erasing channels were suppressed to the same level, however, if the erase frequency is set to be out of the frequency bandwidth of reproduced signal, the crosstalk allowance from the erasing channels becomes large.
  • the erasing channels erase Ach 18 , erase Bch 19
  • the recording channels record Ach 15 , record Bch 16

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  • Management Or Editing Of Information On Record Carriers (AREA)
  • Recording Or Reproducing By Magnetic Means (AREA)
  • Television Signal Processing For Recording (AREA)
US10/349,954 1994-10-20 2003-01-24 Magnetic recording/reproducing apparatus with the recording/reproducing heads preceding the erasing heads Expired - Fee Related USRE39029E1 (en)

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US10/349,954 USRE39029E1 (en) 1994-10-20 2003-01-24 Magnetic recording/reproducing apparatus with the recording/reproducing heads preceding the erasing heads

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP25495594A JP3443982B2 (ja) 1994-10-20 1994-10-20 磁気記録再生装置
US54453595A 1995-10-18 1995-10-18
US08/937,303 US5953482A (en) 1995-10-18 1997-09-22 Magnetic recording/reproducing apparatus with the recording/reproducing heads preceding the erasing heads
US10/349,954 USRE39029E1 (en) 1994-10-20 2003-01-24 Magnetic recording/reproducing apparatus with the recording/reproducing heads preceding the erasing heads

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US7667769B2 (en) 2004-07-12 2010-02-23 Honeywell International Inc. Rotatable wireless electrical coupler

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EP1026664A2 (en) 2000-08-09
DE69520401D1 (de) 2001-04-26
EP0708436A3 (en) 1996-08-07
EP1026664A3 (en) 2006-08-16
JPH08124133A (ja) 1996-05-17
DE69520401T2 (de) 2001-07-26
EP0708436A2 (en) 1996-04-24
JP3443982B2 (ja) 2003-09-08

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