JPH11185205A - Magnetic recording and reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a time lapse magnetic recording and reproducing device which can perform reciprocating recording and reproducing. SOLUTION: A drum Du on which heads H1, H2 for recording and reproducing which are arranged symmetrically at 180 deg. and having head track width of Tw1 and different azimuth, and heads H3, H4 for reproducing having head track width Tw2 having relation of Tw1<Tw2<=Tw1 are provided so that the head H3 is provided near the head H1 and the head H4 is provided near the head H2 at a prescribed height is rotated with a prescribed number of rotations. A head used for reproducing operation in a head switching circuit 4 is selected, a tape T reciprocating-recorded is traveled in the forward direction with a running speed two times as much as that in recording, a reproduced signal is generated twice from the same track forward-recorded by the heads H1, H3, also, the tape T is traveled in the reverse direction with a running speed two times as much as that in recording, and a reproduced signal is generated twice from the same track backward-recorded by the heads H1, H3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an upper drum which is driven and rotated at a predetermined number of rotations in a constant rotational direction.
When the rotational speed of the magnetic tape is V when parallel sequential recording traces of a predetermined track pattern are recorded and formed on the magnetic tape by using the rotating magnetic heads for recording and reproduction in turn. In the state where the magnetic tape is continuously run in the forward direction at a running speed of V / n, a recording mark is recorded and formed on the magnetic loop by one of the rotary magnetic heads for recording and reproduction. / N, when the magnetic tape is continuously run in the reverse direction at a running speed of / n, and a recording mark is recorded and formed on the magnetic tape by the other one of the above-mentioned rotary magnetic heads for recording and reproduction. The above-mentioned recording / reproducing circuit may be arranged such that parallel sequential recording traces of a predetermined track pattern are recorded on the magnetic tape, or when the magnetic tape is intermittently transported in the forward direction at each stop. A recording mark is formed on the magnetic tape by one of the magnetic heads, and at each stop of the magnetic tape being intermittently conveyed in the reverse direction, the other one of the recording and reproducing rotary magnetic heads described above is used. A helical scan-type magnetic recording medium that performs a time-lapse recording operation such that when a recording mark is recorded and formed on a magnetic tape, parallel sequential recording marks of the predetermined track pattern are recorded and formed on the magnetic tape; The present invention relates to a magnetic recording / reproducing apparatus for reproducing a recorded magnetic tape created by the recording / reproducing apparatus.

[0002]

2. Description of the Related Art An information signal is recorded on a magnetic tape wound around a part of a peripheral surface of a drum composed of an upper drum and a lower drum by a rotary magnetic head, and the information signal is reproduced from the magnetic tape. 2. Description of the Related Art A helical scan type magnetic recording / reproducing apparatus has been widely used as a video tape recorder (VTR) [or a video cassette recorder (VCR)]. And
In the helical scan type magnetic recording / reproducing apparatus described above, as one means for achieving high-density recording, each rotating magnetic head in a pair of rotating magnetic heads provided with magnetic air gaps having opposite azimuth angles is used. The recording marks in the state of being obliquely arranged in the longitudinal direction of the magnetic tape are alternately recorded on the magnetic tape, and usually, one recording mark formed on the magnetic tape is recorded for one field period. Video signals can be recorded and reproduced.

The helical scanning type magnetic recording / reproducing apparatus described above has conventionally been used as a monitoring (security) apparatus by combining it with, for example, a monitoring (security) imaging device (TV camera). Is being done. When the helical scanning type magnetic recording / reproducing apparatus is used in the above-described usage mode, the video signal continuously output from the TV camera on the time axis is determined at predetermined time intervals. A time-lapse magnetic recording / reproducing apparatus which records and reproduces the extracted video signal of one field period or one frame period on a magnetic tape is used. The time-lapse magnetic recording / reproducing apparatus described above has been widely used for crime prevention in financial institution stores, supermarket stores, convenience store stores, and the like.

In a time lapse type magnetic recording / reproducing apparatus which performs a recording / reproducing operation by using a magnetic tape of a predetermined length, a conventional magnetic tape of a predetermined length requires a long time recording operation. From the video signal output from the surveillance (security) TV camera, the running speed of the magnetic tape is normally reproduced only during the period in which frame recording is performed at predetermined time intervals. It is configured to intermittently travel so as to reach a specified traveling speed during operation and record frames, or a predetermined time within a video signal output from a monitoring (security) TV camera. That is, the video signal of each interval is recorded on a magnetic tape in a stopped state, and each time a video signal is recorded, the magnetic tape is moved by a predetermined distance, and stands by in a stationary state for the next recording. A video signal output from a surveillance (security) TV camera is provided on a magnetic tape which is configured to perform frame recording in such a recording mode or continuously runs at a low running speed. Such as recording frames at intervals of time,
Various time-lapse VTRs have been proposed.

However, in any of the conventional magnetic recording / reproducing apparatuses using the time lapse method, the recording operation on one magnetic tape is performed from the start end to the end end of the magnetic tape. Thus, the recording operation on the magnetic tape has been completed. Therefore, in order to continue the recording operation for a long time, another magnetic tape is successively attached to the magnetic recording / reproducing apparatus so that the recording operation is continued, or the recording is performed from the beginning to the end of the winding. A complicated operation such as rewinding the completed magnetic tape to the beginning of the winding and continuing the recording operation from the beginning of the winding of the magnetic tape is required.

Japanese Patent Application Laid-Open Nos. 50-85316 and 3-194701 propose a VTR capable of reciprocal recording operation. However, the VTR disclosed in the above-mentioned Japanese Patent Laid-Open Publication No.
However, there are problems in compatibility with a standard VTR because a large number of rotating magnetic heads are arranged so as to enable reciprocal recording, and a winding angle of a magnetic tape is changed.
Further, in the VTR described in Japanese Patent Application Laid-Open No. 3-194701, the reciprocating recording operation is performed by setting the rotation speed of the rotating drum to twice or more the rotation speed of the rotating drum during a normal recording / reproducing operation. If it can be used as a standard VTR, the circuit of the video signal becomes complicated. Further, any conventional VTR capable of the reciprocating recording operation described above can record a full-field video signal, but does not take time lapse recording into consideration.

[0007]

Therefore, in the present applicant company, the reciprocating recording operation is carried out with the magnetic tape being intermittently transferred, or the reciprocal recording / reproducing is performed with the magnetic tape running continuously. A time-lapse type magnetic recording / reproducing apparatus capable of performing an operation is disclosed in Japanese Patent Application No. 9-208588.
No. is proposed. The time-lapse type magnetic recording / reproducing apparatus capable of performing the reciprocating recording / reproducing operation already proposed by the applicant company described above has a symmetrical center axis on the center axis of the upper drum which is driven and rotated in a constant rotational direction at a predetermined rotational speed. By using the recording / reproducing rotary magnetic heads arranged at 180 degrees symmetrical positions alternately in turn, parallel sequential recording marks of a predetermined track pattern are recorded and formed on the magnetic tape. Assuming that the running speed of the magnetic tape in the case is V, the magnetic tape is continuously run in the forward direction at a running speed of V / n. In the state where recording marks are formed on the magnetic loop and the magnetic tape is continuously run in the reverse direction at a running speed of V / n, the magnetic tape is driven by the other one of the rotary magnetic heads for recording and reproduction described above. When recording traces are recorded on the tape, the parallel sequential recording traces of the predetermined track pattern are recorded on the magnetic tape, or are intermittently transferred in the forward direction. At each stop of the magnetic tape, one of the rotary magnetic heads for recording and reproduction described above causes a recording mark to be formed on the magnetic tape, and at each stop of the magnetic tape being intermittently transported in the reverse direction, When recording marks are recorded and formed on the magnetic tape by the other one of the above-mentioned rotary magnetic heads for recording and reproduction, parallel sequential recording marks of the above-mentioned predetermined track pattern are recorded and formed on the magnetic tape. A helical scan type magnetic recording / reproducing apparatus that performs a time-lapse recording operation according to the present invention. I was able to satisfactorily solve the various problems in the noted conventional devices. The present invention provides a time-lapse type magnetic recording / reproducing apparatus capable of performing the reciprocating recording / reproducing operation already proposed by the present applicant company. The reproduction of image information and other information from the recorded magnetic tape can be performed without using a memory by using a magnetic recording / reproducing device with a simple configuration that adds a special rotating magnetic head for reproduction. It is one that can be easily obtained.

[0008]

According to the present invention, there is provided an upper drum which is driven and rotated in a fixed rotational direction at a predetermined rotational speed, and each of the upper drums is disposed at a position symmetrical with respect to the central axis by 180 degrees. When rotating magnetic heads for recording and reproduction are sequentially and alternately used, and the running speed of the magnetic tape is V when parallel sequential recording traces of a predetermined track pattern are formed on the magnetic tape, V In the state where the magnetic tape is continuously run in the forward direction at a running speed of / n, one of the rotary magnetic heads for recording and reproduction is used to record and form a recording mark on the magnetic loop, and V / n In the state where the magnetic tape is continuously run in the reverse direction at the running speed, when a recording mark is recorded and formed on the magnetic tape by the other one of the rotary magnetic heads for recording and reproduction, the predetermined Track track Or a rotating magnetic head for recording / reproducing as described above, at each stop of the magnetic tape being intermittently transported in the forward direction so that parallel sequential recording marks of the magnetic tape are recorded on the magnetic tape. A recording mark is formed on the magnetic tape by one of the above, and at each stop of the magnetic tape being intermittently transported in the reverse direction, the magnetic recording is performed by the other of the above-described rotary magnetic heads for recording and reproduction. Helical scan type magnetic recording / reproducing which performs a time-lapse recording operation such that when a recording mark is recorded and formed on a tape, a parallel sequential recording mark of the predetermined track pattern is recorded and formed on a magnetic tape. As a magnetic recording / reproducing apparatus for reproducing a recorded magnetic tape created by the apparatus, a magnetic recording / reproducing apparatus having a first azimuth angle and a predetermined recording mark on a magnetic tape is provided. A first rotating magnetic head for recording / reproducing, which has a magnetic gap with a head track width Tw1 capable of forming a recording track of a second type, has a second azimuth angle different from that of the first rotating magnetic head. And a second rotary magnetic head for recording and reproduction having a magnetic gap having a head track width Tw1 and the same mounting height on the upper drum at a position symmetrical with respect to the center axis of the drum by 180 degrees. And has a second azimuth angle and the head track width T described above.
The third rotating magnetic head for reproduction, which has a magnetic gap with a head track width Tw2 in a relationship of Tw1 <Tw2 ≦ 2Tw1 with respect to w1, has a drum circle with respect to the first rotating magnetic head. At a position separated by a predetermined minute interval in the circumferential direction, one end of the magnetic gap is located near one side edge of the magnetic gap of the first rotating magnetic head in a direction parallel to the center axis of the drum. And the second rotating magnetic head is disposed such that the entire width of the rotating track of the magnetic gap of the second rotating magnetic head is included in a part of the rotating track of the magnetic gap of the third rotating magnetic head, Furthermore, the first azimuth angle is provided at a position 180 degrees symmetric with respect to the center axis of the drum with respect to the third rotating magnetic head, and the head track width T
A fourth rotating magnetic head for reproduction provided with a magnetic gap of w2 is disposed on one side of the magnetic gap of the second rotating magnetic head in a direction in which one end of the magnetic gap is parallel to the center axis of the drum. And the whole of the rotation path of the magnetic gap of the first rotating magnetic head in the width direction is included in a part of the rotation path of the magnetic gap of the fourth rotating magnetic head. The upper drum, which is arranged so that
Means for rotating at a specific rotation speed only in a predetermined specific rotation direction, and the angle between the rotation locus of each rotary magnetic head and the reference edge of the magnetic tape, even if the transfer direction of the magnetic tape is the forward direction. Means for controlling the same angle even in the reverse direction, and when the magnetic tape is intermittently transported in the forward direction, the first (or second) rotation When the reproducing operation is performed using the magnetic head and the fourth (or third) rotating magnetic head, and when the magnetic tape is intermittently transported in the reverse direction and sequentially stopped, the second operation is performed. A magnetic recording / reproducing apparatus including a (or first) rotating magnetic head and means for performing a reproducing operation using the third (or fourth) rotating magnetic head, or
NV (where n is a natural number)
The first (or second) rotating magnetic head and the fourth (or third) rotating magnetic head are used to drive the first (or second) rotating magnetic head. In the state where the magnetic tape is running at nV in the reverse direction, the second (or first) rotating magnetic head, the third rotating magnetic head, and the third A magnetic device comprising means for performing a reproducing operation on a recording mark formed by the second (or first) rotating magnetic head using the (or fourth) rotating magnetic head. It is a recording and reproducing device.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific contents of a magnetic recording / reproducing apparatus according to the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 is a block diagram showing a schematic configuration of a magnetic recording / reproducing apparatus of the present invention, and FIG. 2 is a diagram showing an example of an arrangement of various rotary magnetic heads provided on an upper drum Du. FIG.
In the above, Du is the upper drum, and the magnetic tape T is a part of the peripheral surface of the upper drum Du (and the lower drum not shown in FIG. 2) (a range corresponding to a center angle of the drum of more than 180 degrees). ).

In FIG. 2, H1, H2, H3, H4 are:
These are first, second, third and fourth rotating magnetic heads, respectively. The first rotating magnetic head H1 has a first azimuth angle, and has a head track width T such that a recording mark having a predetermined recording mark width can be formed on the magnetic tape T.
This is a rotary magnetic head for recording and reproduction having a magnetic gap of w1. The second rotating magnetic head H2 has a second azimuth angle different from that of the first rotating magnetic head H1, but has the same head track width Tw1 as that of the first rotating magnetic head H1. Track width Tw
This is a recording / reproducing rotary magnetic head having one magnetic gap. Then, the first rotary magnetic head H1 for recording and reproduction and the second rotary magnetic head H2 for recording and reproduction are described.
Means that it is disposed at the same mounting height on the upper drum Du at a position symmetrical with respect to 180 degrees about the center axis 12 of the drum.

The third rotary magnetic head H3 for reproduction, which is provided at a position separated by a predetermined minute interval in the circumferential direction of the drum with respect to the first rotary magnetic head H1 for recording and reproduction, is described above. It has a second azimuth angle, and for the head track width Tw1, Tw1 <T
It has a magnetic gap having a head track width Tw2 in a relationship of w2 ≦ 2Tw1, and is symmetric with respect to the third rotary magnetic head H3 for reproduction by 180 degrees with respect to the center axis 12 of the drum. The fourth rotary magnetic head H4 for reproduction, which is disposed at the position (1), has the above-described first azimuth angle and has the third rotary magnetic head H for reproduction.
3 has a magnetic gap having the same head track width Tw2 as the head track width Tw2.

The upper drum Du and the lower drum Dd provided in pairs with the upper drum Du (for example, FIG.
) And a small diameter portion (a portion indicated by a reference numeral 13 in FIG. 4) which is configured separately from the upper and lower drums Du and Dd and formed below the lower drum Dd. Guide member Lr for regulating the running position of the magnetic tape (a member for regulating the position of the reference edge Te of the magnetic tape T, and may be described as a lead ring Lr). Constitutes the drum structure DA. The guide member Lr for regulating the traveling position of the magnetic tape.
Is provided with a guide portion (position regulating surface) G for the reference edge of the magnetic tape.

The arrow a in FIG. 2A indicates the direction of rotation of the upper drum Du, and the arrow b in FIG. 1 indicates the direction of transport of the magnetic tape T in the forward direction. The transport direction of the magnetic tape T in the reverse direction is indicated by an arrow -b in FIG. In FIG. 2A, a drum motor for driving and rotating the upper drum Du at a predetermined number of rotations is omitted for simplification of the drawing. For example, a motor having a configuration in which a rotor is fixed to the above-described upper drum Du may be used. When the drum motor having the above-described configuration is used, the upper drum Du is rotatably supported by a bearing bearing with respect to the center axis of the drum structure DA.

When operating the helical scan type magnetic recording / reproducing apparatus in the normal recording / reproducing mode, the magnetic tape T is moved in the forward direction (the direction of the arrow b in each drawing) at a predetermined running speed [predetermined. Rotating pair of recording / reproducing rotary magnetic heads (first and second rotary magnetic heads H1, H1 provided at 180-degree symmetric positions) rotating at a predetermined rotation direction and a predetermined constant number of rotations. H2) is run at a running speed V (sometimes referred to as a reference running speed V) that enables recording to be formed on a magnetic tape in a guard band-less state.

In the state where the magnetic tape T is running in the forward direction (the direction of the arrow b in FIG. 1) at the reference running speed V as described above, the magnetic tape T is provided at a position 180 degrees symmetrical on the upper drum Du. When the pair of first and second rotating magnetic heads H1 and H2 are driven and rotated at a predetermined number of rotations in a predetermined specific rotation direction [direction of arrow a in FIG. The first and second rotating magnetic heads H1,
The recording marks sequentially and alternately recorded on the magnetic tape T by H2 are arranged, for example, with a predetermined inclination angle (track angle) with respect to the reference edge Te of the magnetic tape T in a state where the sequential recording marks are close to each other. You.

By the way, the first and second rotating magnetic heads H
The rotation direction and rotation speed of H1 and H2 are set to the above-mentioned predetermined specific rotation direction [the direction of arrow a in FIG. A state in which the magnetic tape T is stopped, or a state in which the magnetic tape T is run in the reverse direction (the direction of the arrow -b in FIG. 1) at the above-described reference running speed V, (Where n is a natural number) in the forward direction (the direction of the arrow b in FIG. 1),
1 / n of the reference running speed V of the magnetic tape T
(Where n is a natural number), the first rotating magnetic head H1 (or the second rotating magnetic head H2) described above in each case of running in the opposite direction (the direction of arrow -b in FIG. 1).
The recording trace formed on the magnetic tape T according to the rotation trajectory indicates that the magnetic tape T is traveling in the forward direction (the direction of the arrow b in FIG. 1) at the reference traveling speed V in the first direction. The recording trace formed on the magnetic tape T by the rotation locus of the first rotating magnetic head H1 (or the second rotating magnetic head H2) is a predetermined inclination angle (track angle) with respect to the reference edge Te of the magnetic tape T. It is well known that is different.

Therefore, the state in which the magnetic tape T is continuously running at a running speed V / n lower than the reference running speed V, or the average running speed of the magnetic tape T is as follows:
In the state where the magnetic tape is run intermittently so that the running state becomes equivalent to the case where the magnetic tape is running at the running speed V / n lower than the reference running speed V described above, When the running direction is changed alternately in the forward direction and the reverse direction in order to cause the magnetic tape to perform a continuous reciprocating recording operation, the magnetic tape is provided at a position symmetrical with respect to the center axis of the upper drum Du by 180 degrees. The recording track width and the recording track width are determined by one of the two rotating magnetic heads for recording and reproduction, the first rotating magnetic head H1 and the second rotating magnetic head H2 (for example, the first rotating magnetic head H1). In a state where a corresponding unrecorded area of a predetermined width can be formed between adjacent recording traces, a forward recording operation of repeating the operation of recording and forming sequential recording traces, and the two rotary magnetic heads H1, H2)
Of the other rotating magnetic heads (the second rotating magnetic head H
According to 2), the return path recording operation which repeats the operation of recording and forming the sequential recording trace by the image signal in the unrecorded area between the recording traces sequentially recorded and formed on the magnetic tape at the time of the forward movement is sequentially and alternately changed. In the magnetic recording / reproducing apparatus of the time lapse system in which the recording operation is performed in a state where the rotation is performed, the rotating magnetic head H1 and the second rotating magnetic head H2 are used.
Means for making the recording mark formed on the magnetic tape T by the rotation locus at the same inclination angle (track angle) with respect to the reference edge Te of the magnetic tape T, and magnetic recording / reproducing by the time lapse method A similar means is required for the reproducing operation of the recorded magnetic tape created by the apparatus performing the reciprocal recording operation.

In the magnetic recording / reproducing apparatus of the present invention, even when the running direction and the running speed of the magnetic tape are changed,
A state in which the angle (track angle) between the rotation trajectory of the rotating magnetic head rotating at a specific number of rotations in a specific rotation direction and the reference edge Te of the magnetic tape T does not change, that is, recording on the magnetic tape T The correction operation for making the successive recording traces parallel is performed by the main control unit (system controller) 5 in FIG. 1 and the tilt control unit 7 (see the tilt correction mechanism shown by reference numeral 7 in FIG. 4). ). Here, referring to FIG. 4, the rotation trajectory drawn on the magnetic tape T by the rotating magnetic head is controlled so as to be at an arbitrary predetermined angle with respect to the reference edge Te of the magnetic tape T, or the lead ring Lr The configuration principle and operation principle of the tilt correction mechanism for making the position regulating surface G coincide with the movement locus of the running magnetic tape T will be described.

In FIG. 4, DB is a drum base, and a drum structure DA composed of an upper drum Du, a lower drum Dd, and a lead ring Lr is supported by the drum base DB. The upper drum Du is a drum structure D
The lower drum Dd is rotatably supported by a center bearing 12 (not shown) mounted on the center shaft 12 of the drum structure DA. It is stuck to. The lead ring Lr functioning as a guide for the reference edge Te of the magnetic tape T is formed separately from the lower drum Dd, and comes close to the outer peripheral portion 13 below the lower drum Dd. Are coaxially fitted (not shown) with the lower protruding portion of the lower drum Dd by a knife edge (not shown) provided on the inner periphery of the lower drum Dd.

As shown in FIG. 4, the tilt control unit 7 includes a tilt drive motor (DD motor in FIG. 4) 14 as a power source and a reduction mechanism 1 including a plurality of gears.
5 and 16, a rotary encoder 17, a position detector (preset sensor) 18, and the like. In addition,
The tilt drive motor 14 indicated by a block 14 in FIG. 4 is also assumed to include a motor drive control circuit. As the above-described position detector 18, for example, one having a configuration in which an arc-shaped light shielding plate is moved in an optical path in which a light emitting element and a light receiving element are arranged to face each other may be used. The position detector 18 is configured such that the signal output from the position detector 18 at the moment when the arc-shaped light shielding plate is removed from the optical path in which the light emitting element and the light receiving element are arranged to face each other is the drum described above. Central axis 1 of structure DA
2 and the reference position of the lead ring Lr.

The amount of rotation of the light-shielding plate from the reference position in the position detector 18 is known by measuring the number of pulses output from the rotary encoder 17 so that the reference position of the center axis 12 of the drum structure DA is determined. Direction and the amount of deviation from the reference position of the lead ring Lr can be obtained. The main controller 5 controls the traveling direction and traveling speed of the magnetic tape T in accordance with various operation modes, which are set in the main controller (system controller) 5 of the magnetic recording / reproducing apparatus. The tilt control unit 7 to which the information is given moves the center axis 12 of the drum structure DA including the upper drum Du, the lower drum Dd, and the lead ring Lr in the drum structure DA.
The screws 26, 2 are tilted by a predetermined amount in the direction of arrow 12a (or 12b) in FIG.
A control operation is performed to move the control unit 8 forward and backward.

The lead ring Lr is also tilted by a predetermined amount in a predetermined direction under the control of the tilt control unit 7, so that the running direction of the magnetic tape can be either forward or reverse. However, the pattern of the rotation locus drawn on the magnetic tape T by the rotation locus of the rotating magnetic head is
A state where the track angle is determined, that is, a state where the inclination is corrected, and the reference edge Te of the magnetic tape are set.
The guide portion G (position regulating surface) of the lead ring coincides with the movement locus of the lead ring. First, in a state where the magnetic tape T is traveling at a predetermined traveling speed in the forward direction (the direction of the arrow b in FIG. 1), a predetermined specific rotation direction [the direction of the arrow a in FIG. The lower drum Dd in the case where recording is sequentially and alternately formed on the magnetic tape T by the rotating magnetic head which is driven and rotated at a predetermined number of rotations, has four drums whose bottom portions protrude from the drum base DB. It is supported by a pivot point (see pivot points 20, 20, 21, 21 in FIG. 4).

FIG. 4 shows four pivots 20, 20, 2
Although only two pivots 20 and 21 out of the two pivots 20 and 21 are shown, the two pivots 2 not shown
0, 21 are the pivot points 20, 21 shown in FIG.
Are provided one by one on a line perpendicular to the plane of the paper at the position (1)). In addition, the lead ring Lr has four pivot points (see pivot points 22, 22, 23, and 23 in FIG. 4) projecting from the lead ring Lr. Rotation support points 22 and 2
Only two pivots 22, 23 of 2, 23, 23 are shown, but the two pivots 22, 23 not shown are shown in FIG. Pivot point 22,
23 are provided on a line perpendicular to the sheet of paper at position 23). Springs (springs 19, 24, and 25 in FIG. 4) are mounted between the lead ring Lr and the drum base DB and between the lower drum Dd and the drum base DB, respectively.
The above-mentioned parts are brought into a predetermined connection state with each other.

By the way, the recording marks formed on the magnetic tape T alternately and sequentially by the rotary magnetic head provided on the upper drum Du described above are, for example, the magnetic recording and reproducing apparatus in the normal recording and reproducing mode. The magnetic tape T is caused to travel in the same traveling direction as the traveling direction of the magnetic tape (forward direction: the direction of the arrow b in the drawing) during operation, for example, at a traveling speed at which fast-forward reproduction is performed as trick play. When the recording (or reproduction) operation is performed, the screw 27 is driven so as to push up the bottom surface of the lower drum Dd, and the screw 29 is driven in a direction away from the bottom surface of the lower drum Dd, thereby causing the drum base to move. Two rotation fulcrums of the four rotation fulcrums protruding from the DB (the rotation fulcrum 20 and the rotation fulcrum 20 shown in FIG. One pivot point provided on the line) is in contact with the bottom surface of the lower drum Dd, the two pivot point of the as a rotation fulcrum, the upper drum Du and the lower drum D
The center axis with the axis d is rotated in the direction of the arrow 12a in FIG.

Further, the recording marks formed on the magnetic tape T alternately and sequentially by the rotary magnetic head provided on the above-described upper drum Du are recorded, for example, on a magnetic recording / reproducing apparatus in a normal recording / reproducing mode. Is recorded in a running direction opposite to the running direction of the magnetic tape (reverse direction: arrow -b direction in the figure) at a running speed at which rewind reproduction is performed as trick play, for example. Or regeneration) operation, the screw 2
9 is driven to push up the bottom surface of the lower drum Dd.
Further, the screw 27 is driven in a direction away from the bottom surface of the lower drum Dd, and two of the four rotation fulcrums protruding from the drum base DB (the rotation fulcrum 21 and the figure). One rotation fulcrum provided on a line perpendicular to the plane of the drawing at the position of the rotation fulcrum 21 shown in FIG.
The center axis of the upper drum Du and the lower drum Dd is rotated in the direction of the arrow 12b in FIG. 4 using the two rotation fulcrums as the rotation fulcrum. The above-described driving operations for the screws 27 and 29 are performed by the control operation of the tilt control unit 7 in FIG.

When the magnetic tape is traveling in the forward direction (the direction of the arrow b) at the above-mentioned traveling speed of the fast-forward reproduction, one of the four pivots projecting from the lead ring Lr is provided. The two rotation fulcrums (the rotation fulcrum 22 and one rotation fulcrum provided on a line perpendicular to the plane of the drawing at the position of the rotation fulcrum 22 shown in the drawing) are connected to the lower drum Dd. In contact with the bottom surface, the two rotation fulcrums as a rotation fulcrum,
The lead ring Lr is screwed into the lead ring Lr so that the center axis of the lead ring Lr is rotated by a predetermined amount in the direction of arrow 12b in FIG.
The two screws 26 and 28 provided in contact with the bottom surface of d are rotated in opposite directions.

When the magnetic tape is running in the reverse direction (the direction of the arrow -b) at the running speed of the rewind reproduction, the four rotating fulcrums projecting from the lead ring Lr are used. The two rotation fulcrums (the rotation fulcrum 23 and one rotation fulcrum provided on a line perpendicular to the paper surface at the position of the rotation fulcrum 23 shown in the drawing) are lower drums. Dd is in contact with the bottom surface, and the two fulcrums are used as a fulcrum.
The lead ring Lr is screwed into the lead ring Lr such that the center axis of the lead ring Lr is rotated by a predetermined amount in the direction of arrow 12a in FIG.
The two screws 26 and 28 provided in contact with the bottom surface of d are rotated in opposite directions. The above-described driving operations for the screws 26 and 28 are also performed by the operation of the tilt control unit 7, and the running direction and the running speed of the magnetic tape T are changed according to various operation modes. The tilt control unit 7 to which the control information is given from the main control unit 5 according to the setting of the main control unit (system controller) 5 provided in the reproducing apparatus.
Moves the lead ring Lr to the arrow 12a (or 1) in FIG.
The screws 26 and 28 are advanced and retracted so as to be inclined by a predetermined amount in the direction of 2b).

Therefore, the magnetic recording / reproducing apparatus of the present invention performs the normal recording / reproducing operation with the magnetic tape running at the reference traveling speed, and also performs the trick reproduction such as fast forward reproduction and rewind reproduction. In addition to performing an operation to obtain a good reproduced image by the operation of the tilt control unit 7, the continuous reciprocal recording operation is performed by sequentially changing the running direction of the magnetic tape T in the forward direction and the reverse direction. In order to perform the operation, the running direction of the magnetic tape is changed between the forward direction and the reverse direction, and the state of the running speed of the magnetic tape is changed in a predetermined manner. 7, the angle formed by the rotation locus of the rotating magnetic head always rotating at a specific rotation speed in a specific rotation direction and a reference edge Te of the magnetic tape T by the operation of the tilt correction mechanism portion The track angle), so that it is also possible to perform recording and reproducing operations so as to become a predetermined angle state.

In the magnetic recording / reproducing apparatus shown in FIG. 1, when operation mode information input to an operation unit (not shown) is supplied to a system controller (main control unit) 5, the main control unit 5 performs magnetic recording. Each component of the playback device is
A predetermined control signal is supplied to each component of the magnetic recording / reproducing apparatus so that the operation according to the operation mode input from the operation unit can be performed. When the magnetic recording / reproducing apparatus shown in FIG. 1 performs a recording operation of a video signal in the form of an analog signal, the composite video signal supplied to the input terminal 1 to be recorded is converted by the video signal recording / reproducing circuit 3. A recording signal suitable for magnetic recording (a frequency modulated wave signal based on a video signal) is amplified by a recording amplifier and supplied to the rotary magnetic heads H1 and H2 for recording and reproduction via a head changeover switch circuit 4. . In the video signal recording / reproducing circuit 3 described above, the vertical synchronizing signal separated from the composite video signal is transmitted to the system controller 5.
Supplied to

The head switching circuit 4 includes a fixed contact (outward) to which the movable contact v is brought into contact during a forward recording / reproducing operation with the magnetic tape T being transported or running in the forward direction, and a magnetic contact. A changeover switch S having a fixed contact (return) with which the movable contact v is brought into contact during a return recording / reproducing operation with the tape T being transported or running in the reverse direction.
W1, a recording / playback switch SW2, and a head switch SW3 are provided.

The switching operation by the switches SW1 to SW3 provided in the head switching circuit 4 is performed by a switching control signal supplied from the main control unit 5 to the switches SW1 to SW3. The operation is performed in a state as shown in FIG. 3 corresponding to the operation mode of the apparatus, and a predetermined rotating magnetic head is selectively used. The switching control signal is generated based on a drum flip-flop signal generated in synchronization with the rotation of the upper drum Du, an operation mode signal, a signal indicating a running direction of the magnetic tape, and the like. FIG.
In the uppermost column, SW1, SW2, and SW3 indicate the above-described changeover switches SW1 to SW3, and the rotating magnetic head uses a combination of the changeover modes of the changeover switches SW1 to SW3 provided in the head changeover circuit 4. 3 shows a rotating magnetic head that is selectively used. In FIG. 3, forward, backward, R, P, a, b, etc. indicate fixed contacts of the changeover switches SW1, SW2, SW3 shown in FIG.

In FIG. 1, Hc is a control head, and this control head Hc records a control signal generated by a control (CTL) signal recording / reproducing circuit 8 on a control track of a magnetic tape. During the recording operation of the magnetic recording / reproducing apparatus, the recording operation of the control signal performed on the control track of the magnetic tape T is performed by moving the magnetic tape in the first forward direction in the continuous reciprocating recording operation performed using the magnetic tape T. At the time of (or running), a portion preceding the portion to be recorded on the magnetic tape T by the rotary magnetic head for recording / reproducing is subjected to a full width erasing operation performed by using a fixed full width erasing head and the magnetic tape T It only needs to be implemented. Further, at the time of the recording operation on the return path and the second and subsequent recording operations, the erasing operation may be performed by a rotary magnetic head for preceding erasing (not shown).

The magnetic recording / reproducing apparatus of the present invention rotates the magnetic tape in a forward (or reverse) direction at a traveling speed of 1 / n times the traveling speed V during the normal recording operation, for recording / reproduction. In the case where the magnetic head H1 (or H2) is used as an embodiment in which a recording mark is recorded on the magnetic tape T, recording of a control signal performed on a control track of the magnetic tape T is performed by magnetic recording. At the time of the first forward recording operation performed when the magnetic tape runs in the first forward direction in the continuous reciprocating recording operation performed using the tape T, a predetermined one of the two rotary magnetic heads H1 and H2 for recording and reproduction is used. The magnetic tape T is rotated by the other recording / reproducing rotary magnetic head.
Is recorded at a predetermined relational position with respect to the position of the recording trace formed on the recording medium. The interval between the recording positions of the control signals on the control tracks of the magnetic tape is set to be the same as the recording interval in the normal recording operation.

The magnetic recording / reproducing apparatus intermittently moves the magnetic tape T by a predetermined distance, and when the magnetic tape T is stopped, the recording / reproducing rotary magnetic head H
The recording operation of the control signal when the magnetic tape T is moved as shown in FIG. 5 (b) when used as an embodiment in which a recording mark is recorded and formed by 1 (or H2). During this period, the control signal generated by the control (CTL) signal recording / reproducing circuit 8 is recorded on the control track of the magnetic tape. Drum control unit 6 shown in FIG.
Performs a control operation of a rotation speed and a rotation phase of a drum motor (not shown). A drum control unit 6 includes a drum generator generated by a frequency generator in a signal generator 31 attached to a rotation shaft of the drum motor. Rotating FG signal and drum P
A G signal (rotation reference phase signal) is supplied.

The capstan control circuit 9 shown in FIG. 1 is a circuit for controlling the rotation speed and rotation phase of the capstan motor 10. In FIG. 5A schematically showing a specific configuration of the capstan control circuit 9, a dotted frame 9i constituted by a counter 34 and an intermittent drive voltage generation circuit 35 is shown.
The circuit arrangement in the figure shows a circuit arrangement portion used for generating a control signal when the magnetic recording / reproducing apparatus performs the recording / reproducing operation with the magnetic tape T intermittently moved. In the capstan control circuit 9 shown in FIG. 5A, the frequency / voltage converter (F / V converter) 4
2, the phase comparator 39, the adder 40, and the phase compensation circuit 41, the circuit arrangement in the dotted frame 9c is such that the recording / reproducing operation is performed by continuously running the magnetic tape T. 3 shows a circuit arrangement used for generating a control signal when the operation is performed.

The output from the intermittent drive voltage generating circuit 35 in the circuit arrangement within the dotted frame 9i is supplied to the fixed contact i of the switch 37 for changing the running mode of the magnetic tape.
The output from the phase compensating circuit 41 in the circuit arrangement within the dotted frame 9c is supplied to the fixed contact c of the switch 37 for switching the running mode of the magnetic tape. The movable contact v of the switch 37 for changing the running mode of the magnetic tape.
Is connected to the input side of the drive circuit 38, and is supplied from the main control unit 5 when the magnetic recording / reproducing apparatus is used for recording / reproducing operation in a state where the magnetic tape is intermittently moved. When the movable contact v is switched to the fixed contact i by the switching control signal, and the magnetic recording / reproducing apparatus is used for the recording / reproducing operation in a state where the magnetic tape is continuously run, the main control unit 5 The movable contact v is switched to the fixed contact c side by the switching control signal supplied from the switch.

The components of the capstan control circuit 9 shown in FIG. 5A except for the circuit arrangement shown in the dotted frame 9i and the circuit arrangement shown in the dotted frame 9c, ie, the components shown in FIG. , Tracking control circuit 36, magnetic tape running mode changeover switch 37, drive circuit 38
For example, the magnetic recording / reproducing apparatus performs the recording / reproducing operation with the magnetic tape T intermittently moved, and the magnetic recording / reproducing apparatus performs the recording / reproducing operation with the magnetic tape T continuously moved. It is commonly used in both operating states. The drive circuit 38 reverses the polarity of the drive voltage supplied to the capstan motor 10 based on the traveling direction inversion signal supplied from the main controller (system controller) 5 so that the traveling direction of the magnetic tape can be switched. Operate as it does. Therefore, the capstan control circuit 9 is configured to drive the capstan motor 10 in both forward and reverse directions.

The capstan control circuit 9 is supplied with a capstan FG signal generated by a frequency generator provided in a signal generator 11 mounted on a rotating shaft of a capstan motor 10. . The capstan FG signal is supplied to a counter 34, a tracking control circuit 36, and a frequency / voltage converter (F / V converter) 42 provided in the capstan control circuit 9. The counter 34 is provided with control data from the main control unit 5 and an output signal of the tracking control circuit 36 in addition to the above-described capstan FG signal.

The tracking control circuit 36 divides the frequency of the capstan FG signal and outputs the divided capstan FG signal.
A tracking control signal is generated based on the G signal, a control signal CTL (CTL signal) reproduced from a control track of the magnetic tape T, and tracking data supplied from the main control unit 5, and the tracking control signal is generated by the phase comparator 3.
9 and a counter 34. The main control unit 5 stores predetermined plural types of tracking data in a ROM. The main control unit 5 distinguishes the recording process each time the magnetic recording / reproducing apparatus changes the tape running direction. ☆
The counting is performed by a counter (not shown), and the predetermined plurality of types of tracking data are sequentially switched in accordance with the count value of the counter to the tracking control circuit 36 in the capstan control circuit 9. Supplying.

Now, using the input means (for example, a keyboard and a mouse) provided on an operation unit (not shown), the frame recording in the magnetic recording / reproducing apparatus is performed while the magnetic tape T is intermittently moved. When the operation mode for performing the reproduction operation is set, the main control unit 5 causes the intermittent drive voltage generation circuit 35 to generate a drive voltage. In the operation mode in which the frame recording and reproduction operations are performed in the magnetic recording / reproducing apparatus in a state where the magnetic tape T is intermittently moved, as described above, in the circuit arrangement in the dotted frame 9i described above. The output from the intermittent drive voltage generation circuit 35 is supplied to the drive circuit 38 via the fixed contact i and the movable contact v of the magnetic tape running mode switch 37.

Therefore, the above-described intermittent drive voltage generation circuit 3
The drive voltage generated in 5 is supplied as drive power to the capstan motor 10 via the drive circuit 38. During the first recording operation period when the magnetic recording / reproducing apparatus starts the reciprocal recording operation, the first outward recording operation in which the running direction of the magnetic tape is in the forward direction is performed. That is, the running direction inversion signal supplied from the main control unit 5 to the drive circuit 38 during the first recording operation period when the magnetic recording / reproducing apparatus starts the reciprocal recording operation is shown in FIG. 5B. Is in a high level state as shown in FIG.
8 outputs a driving power having a polarity that causes the capstan motor 10 to rotate forward.

The counter 34 which performs a counting operation using the capstan FG signal generated by the rotation of the capstan motor 10 as a signal to be counted, that is, the counter 34 provided in the dotted frame 9i in FIG. The counter 34 performs a counting operation using the above-described capstan FG signal as a signal to be counted, and the count value is included in the control data supplied from the main control unit 5 and the output signal of the tracking control circuit 36. A plurality of predetermined numerical values C1, C2, C3 [FIG.
(See C1, C2, C3 in (b)) of FIG.
To supply.

That is, during the period from when the counter 34 starts counting operation for the capstan FG signal to when the count value of the counter 34 reaches the predetermined numerical value C1, the driving circuit 38 receives the signal shown in FIG. As shown in (b), the output signal in the high level state is supplied to the drive circuit 38 via the fixed contact i and the movable contact v of the magnetic tape running mode switch 37. Thus, during a period until the count value of the counter 34 reaches the predetermined numerical value C1, the drive power for driving the capstan motor 10 to rotate forward is supplied from the drive circuit 38 to the capstan motor 10.

The count value of the counter 34 is a predetermined numerical value C
When the number reaches 1, the supply of the driving power to the capstan motor 10 is stopped. However, since the capstan motor 10 continues to rotate by inertia even when the supply of the driving power is stopped, the count value of the counter 34 continues to increase.
In the forward recording operation performed as the first recording operation in which the magnetic recording / reproducing apparatus starts the reciprocal recording operation, the control signal recording / reproducing circuit is started when the count value of the counter 34 matches a predetermined numerical value C2. The intermittent drive signal and the running direction reversal signal shown in the control signal (CTL signal) [FIG.
On the control track of Next, when the count value of the counter 34 reaches a predetermined numerical value C3,
The reverse rotation brake is applied to completely stop the capstan motor 10. This state can be easily understood by referring to the intermittent drive signal and the traveling direction inversion signal shown in FIG.

The "equivalent to one frame" shown in FIG. 5 (b) indicates that the two recording marks on the magnetic tape T are arranged adjacent to each other without overlapping each other. Indicates the transfer amount. Then, a plurality of predetermined count values in the above-described counter 34 are set so that the transfer amount of the magnetic tape is exactly “corresponding to one frame”. The information of the count value is included in the control data supplied from the main control unit 5 and the output signal of the tracking control circuit 36 as described above. In the recording operation and the reproducing operation other than the outward recording operation performed as the first recording operation in which the magnetic recording / reproducing apparatus starts the reciprocal recording operation, the counting is performed after the control signal is reproduced from the magnetic tape T. The counting operation of the container is started, and when a predetermined count value C4 is reached, the reverse rotation brake is applied to completely stop the capstan motor 10. The above-described predetermined count value C4 corresponds to the tracking data supplied from the main control unit 5. The predetermined count value C4 is different depending on the recording operation period when the magnetic tape is moved in the forward direction and the recording operation period when the magnetic tape is moved in the reverse direction. Therefore, it is not shown in the figure.

Next, using the input means (for example, a keyboard and a mouse) provided on an operation unit (not shown), the frame recording in the magnetic recording and reproducing apparatus is performed while the magnetic tape T is continuously running. When the operation mode in which the recording is executed is set, as described above, the output from the phase compensation circuit 41 in the circuit arrangement in the dotted frame 9c is used as the magnetic tape running mode switching switch. 37
Is supplied to the drive circuit 38 via the fixed contact c and the movable contact v. In a frequency-voltage converter (F / V converter) supplied with a capstan FG signal generated by a frequency generator provided in a signal generator 11 attached to a rotating shaft of a capstan motor 10, The stun FG signal is converted into a voltage (speed control).

At the time of the first outward recording operation performed as the first recording operation in which the magnetic recording / reproducing apparatus starts the reciprocal recording operation, the capstan FG signal is frequency-divided inside the tracking control circuit 36, and the output signal is output. Is supplied to the phase comparator 39. The phase comparator 39 compares the signal obtained by dividing the frequency of the capstan FG signal output from the tracking control circuit 36 with a reference signal supplied from the main control unit 5. The output signal of the phase comparator 39 and the output signal of the F / V converter 42 are added by an adder 40, and the output signal of the adder 40 is added to a phase compensation circuit 41 and a magnetic tape. Is supplied to the drive circuit 38 via the fixed contact c and the movable contact v of the switch 37 of the traveling mode changeover switch.

During the recording operation and the reproducing operation other than the first recording operation period when the magnetic recording / reproducing apparatus starts the reciprocal recording operation, the phase comparator 39 sets the magnetic tape T
The phase of a signal obtained by delaying the reproduction control signal reproduced from the main control unit 5 in accordance with the value of the tracking data supplied from the main control unit 5 and the reference signal supplied from the main control unit 5 are compared. The output signal of the phase comparator 39 and the output signal of the F / V converter 42 are added by the adder 40, and the output signal of the adder 40 is added to the phase compensation circuit 41. Is supplied to the drive circuit 38 via the fixed contact c and the movable contact v of the switch 37 of the magnetic tape running mode changeover switch. The drive circuit 38 inverts the polarity of the drive voltage supplied to the capstan motor 10 based on the running direction inversion signal supplied from the main control unit 5 during each of the recording operation period and the reproduction operation period. Thus, the driving power is supplied to the capstan motor 10 so that the running direction of the magnetic tape is switched.

In the magnetic recording / reproducing apparatus of the present invention, the upper drum Du is arranged in the arrangement described above with reference to FIG.
Each of the rotating magnetic heads mounted on the magnetic tapes, that is, two rotating magnetic heads H1 and H2 for recording and reproducing, and the rotating magnetic heads H3 and H4 for reproducing are changed according to the change in the moving direction or running direction of the magnetic tape. Irrespective of the rotational direction, the motor is rotated at a predetermined rotational speed in a predetermined specific rotational direction.

The magnetic recording / reproducing apparatus performs a recording / reproducing operation in a normal recording / reproducing operation (normal recording / reproducing, trick play) mode which is not a recording operation mode by the time lapse method. Two magnetic recording / reproducing rotary magnetic heads H are added to the magnetic tape T in a state where the magnetic tape is intermittently moved in the forward direction by a predetermined distance and then stopped.
1 and H2, one recording / reproducing rotary magnetic head, for example, one recording trace by one frame image signal recorded and formed immediately before by the recording / reproducing rotary magnetic head H1. At a position separated by the unrecorded area of the width of the recording mark,
The two rotary magnetic heads H1 and H2 for recording and reproduction described above.
The recording operation on the outward path, in which a recording operation of recording and forming one new recording trace by one frame of image signal by one specific recording / reproducing rotary magnetic head H1, is performed, and a magnetic tape is performed. In the opposite direction, the magnetic tape T, which is intermittently moved by a predetermined distance and then stopped, is subjected to the outward recording operation of the two rotating magnetic heads H1 and H2 for recording and reproduction. A recording operation for recording and forming one new recording mark by an image signal of one frame in a portion which was set as an unrecorded area at the time of the recording operation on the outward path by the recording / reproducing rotary magnetic head H2 which was not used in the above. And a recording operation in the first reciprocating recording operation mode in which the recording operation on the return path is repeated alternately and continuously.

A magnetic tape T running continuously in the forward direction at a running speed of 1 / n (where n is a natural number) of the reference running speed V has two rotations for recording and reproduction. One recording mark width by one recording mark width based on one frame image signal recorded immediately before by one specific rotating magnetic head (for example, the rotating magnetic head H1) among the magnetic heads H1 and H2. At a position separated from the recording area, a new one by one frame image signal is generated by a specific one of the two rotating magnetic heads H1 and H2.
A recording operation on the outward path, in which a recording operation of recording and forming a recording mark of a book is repeated, and 1 / n of the reference traveling speed V (however,
n is a natural number) and the two rotating magnetic heads H are attached to a magnetic tape T running continuously in the reverse direction at a running speed of
One of the recording signals H1 and H2, which is not used in the outward recording operation, is recorded as an unrecorded area at the time of the outward recording operation. A recording operation in a second reciprocal recording operation mode in which a recording operation on a return path, in which a recording operation for recording and forming a mark is repeated, and a recording operation on a return path are sequentially and alternately and continuously performed.

The operation mode of the magnetic recording / reproducing apparatus to be operated in each of the above-described operation modes is determined by input means (for example, a keyboard, Mouse)
It is determined by inputting information on the operation mode selected by the user. When the operation mode is set so that the magnetic recording / reproducing apparatus performs the recording / reproducing operation in the normal recording / reproducing operation (normal recording / reproducing, trick play) mode which is not the recording operation mode by the time lapse method described above. Since the recording / reproducing operation is well known, detailed description thereof is omitted here.

Next, in the reciprocating recording operation mode described above, the magnetic recording / reproducing apparatus sets the track angle of a recording mark formed by the rotating magnetic head H1 on the magnetic tape T in a stopped state during forward recording; The track angle of the recording mark recorded and formed by the rotating magnetic head H2 on the magnetic tape T in the stopped state at the time of the backward recording is the same. Therefore, in the reciprocating recording operation in this case, it is not necessary to change the position of the rotation locus circle of the rotary magnetic head between the forward recording operation and the backward recording operation by the operation of the tilt control unit 7 described above. When the magnetic tape on which frame recording has been performed in the recording operation mode is reproduced while continuously running at a constant traveling speed, the position of the rotation locus circle of the rotating magnetic head is determined by the operation of the tilt control unit 7 described above. May be changed so that a good reproduction signal can be obtained.

However, even in the case where frame recording is performed in the reciprocating recording operation mode described above, the magnetic tape T runs at the reference running speed V, for example, as in the case of the above case. In this state, the recording marks having the same track angle as the recording mark formed on the magnetic tape T by the rotary magnetic heads H1 and H2 are formed on the magnetic tape T in a stopped state. As described above, the position of the rotation locus circle of the rotary magnetic head in the forward recording operation and the backward recording operation in the reciprocating recording operation mode shown in FIG. Then, the recording operation may be performed. It goes without saying that the track angle can be set arbitrarily.

In the forward recording operation when frame recording is performed in the reciprocating recording operation mode described above, one of the two rotating magnetic heads H1 and H2 is used by the predetermined rotating magnetic head H1. When the magnetic tape T is moved intermittently by two recording trace widths in the forward direction (the direction of the arrow b in FIG. 1) intermittently, one recording trace is sequentially recorded by one frame of image signal. Formed,
An unrecorded area having a width of one recording mark is formed between one recording mark sequentially recorded on the magnetic tape T by the rotating magnetic head H1.

At the time of the first outward recording operation when the reciprocating recording operation is first performed on the magnetic tape T, during the period in which the magnetic tape T moves, the control head Hc moves the control track of the magnetic tape T to the control track. The control signal CTL is recorded. In FIG. 6, for example, the recording position of the control pulse on the magnetic tape T is shown at a position close to the recording mark formed by the rotating magnetic head for convenience of explanation. At the time of the first return recording operation when frame recording is performed in the reciprocating recording operation mode, a reverse rotation magnetic head H2 of the two rotation magnetic heads H1 and H2 is used to perform reverse recording. When the magnetic tape T is stopped intermittently in the direction (the direction of the arrow -b in the drawing) by two recording trace widths,
At the time of the second return recording operation, recording is performed in an unrecorded area of one recording trace width provided between each recording trace sequentially recorded on the magnetic tape T.

When the frame recording is performed in the reciprocating recording mode, the rotating magnetic field in the other recording operation period (and the reproduction operation period described later) except for the recording operation period in which the first forward recording operation is performed. The head position control operation is performed by the capstan control circuit 9 using a reproduction control signal reproduced from the control track of the magnetic tape T.

Next, after the first backward recording operation performed on the magnetic tape T by the rotary magnetic head H2, a second forward recording performed on the magnetic tape T by the rotary magnetic head H1 is performed. The operation is performed by the rotary magnetic head H1 used for the recording operation at the time of the first forward pass recording operation, and then the second return pass recording operation is the same as the rotary magnetic head H2 used at the time of the first return pass recording. This is performed using the rotating magnetic head H2. Hereinafter, the sequential reciprocal printing operation is performed in the same manner as described above.

Next, in order to operate the magnetic recording / reproducing apparatus in the above-described operation mode, the user uses input means (for example, a keyboard and a mouse) provided on an operation unit (not shown). When information on the selected operation mode is input, the magnetic recording / reproducing apparatus performs a magnetic tape operation in a state of continuously traveling in the forward direction at a traveling speed of 1 / n of the reference traveling speed V (where n is a natural number). At T, an image of one frame that was recorded and formed immediately before by one specific rotating magnetic head (for example, rotating magnetic head H1) among the two rotating magnetic heads H1 and H2 shown in FIG. A recording operation on the outward path is repeated in which a recording operation of recording one new recording trace by one frame of image signal is formed at a position separated from an unrecorded area of one recording trace width for one recording trace by a signal. Do Then, the reference running speed V of 1 /
A magnetic tape T running continuously in the opposite direction at a running speed of n (where n is a natural number) is used in the outward recording operation of the two rotating magnetic heads H1 and H2. The recording operation on the return path, which repeats the recording operation of recording and forming one new recording mark by the image signal of one frame in the portion which was set as the unrecorded area at the time of the recording operation on the outward path, by the rotating magnetic head H2 which was not provided. Do.

When the magnetic recording / reproducing apparatus performs the reciprocal recording operation in the above-described operation mode, the two rotating magnetic recording devices are used only during the outward recording operation immediately after the continuous reciprocal recording operation is started. A control signal is recorded on a control track at a predetermined relationship position with respect to a position of a recording mark formed on the magnetic tape T by a predetermined rotating magnetic head of the head. During a recording operation period other than the above period, the magnetic tape T
Is not recorded. Then, during a recording operation period and a reproduction operation period other than the outward recording operation period immediately after the continuous reciprocal recording operation is started, a reproduction control signal obtained by reproducing the control signal recorded on the magnetic tape T is used. Thus, the capstan control operation in the sequential recording operation period and reproducing operation period is performed.

When the magnetic recording / reproducing apparatus operates in the operation mode shown in FIG.
Can be changed by detecting the transparent leader tape portions provided at both ends of the magnetic tape. Also magnetic tape T
The change of the switching of the running direction in the forward and reverse directions is performed by recording a predetermined index signal at an arbitrary position on the magnetic tape and reproducing the index signal.
The running direction of the magnetic tape T may be configured to be automatically reversed, or the switching of the running direction of the magnetic tape T in the forward or reverse direction may be artificially performed at an arbitrary position on the magnetic tape T. Good.

The magnetic recording / reproducing apparatus of the present invention comprises a recorded magnetic tape T recorded by the reciprocating frame recording operation in the magnetic recording / reproducing apparatus, that is,
A rotating magnetic head having a magnetic gap with a specific azimuth angle (for example, a rotating head for recording / reproducing) is obtained by a frame-taking recording operation in the forward path performed while the magnetic tape is being transported intermittently or continuously in the forward direction. The sequential recording marks (T in FIG. 6) recorded on the magnetic tape T by the magnetic head H1)
A, TA...), The above-described specific azimuth angle is obtained by the frame shooting recording operation on the return path performed while the magnetic tape is intermittently or continuously transported in the reverse direction. A rotating magnetic head having magnetic air gaps having different azimuth angles (for example, a rotating magnetic head H for recording / reproducing)
2) The reproduction of the recording signal from the recorded magnetic tape T on which the recording traces (TB, TB... In FIG. 6) are recorded by the method 2) can be reproduced well without using the memory. It is.

In the reproducing operation of the magnetic recording / reproducing apparatus of the present invention, when instruction information for the reproducing operation is given to the magnetic recording / reproducing apparatus shown in FIG.
The changeover switches SW1 to SW in the head switching circuit 4 correspond to the reproduction operation on the forward path and the reproduction operation on the return path.
3 is set to a switching mode at the time of the reproducing operation as shown in FIG.
1 to SW3. Further, the main control unit 5 intermittently transports the recorded magnetic tape to be played back in a predetermined transport direction or continuously runs at a predetermined travel speed in accordance with the designated playback operation mode. The control information for causing the rotation of the rotary magnetic head to coincide with the recording trace on the magnetic tape T is supplied to the tilt control unit 7. I do.

As a result, the recorded magnetic tape T is intermittently transported in the forward direction (the direction of the arrow b in the figure), or the recorded magnetic tape T is moved in the forward direction (the direction of the arrow b in the figure). During a reproducing operation in a state where the vehicle is continuously running, the rotating magnetic head H1 and the rotating magnetic head H4 are used for the reproducing operation by the switching operation of the head switching circuit 4 during the reproducing operation shown in FIG. You. In addition, the recorded magnetic tape T is intermittently transported in the reverse direction (arrow-b direction in the figure), or the recorded magnetic tape T is continuously moved in the forward direction (arrow b direction in the figure). In the running state, the rotating magnetic head H2 and the rotating magnetic head H3 are used for the reproducing operation by the switching operation of the head switching circuit 4 during the reproducing operation shown in FIG.
Further, the capstan control circuit 9 transfers the recorded magnetic tape T in a transfer mode corresponding to the instructed reproduction operation mode in the control mode as described above with reference to FIG. Further, the tilt control unit 7 performs a control operation such that the rotation locus of the rotary magnetic head used for reproduction matches the recording trace on the magnetic tape T.

In each of FIGS. 6 to 11, T indicates sequential recording marks TA, TA recorded and formed by the recording / reproducing rotary magnetic head H1 in the forward recording operation in the reciprocating recording operation as described above. , And the recorded magnetic tape in a state where sequential recording marks TB, TB,... Formed by the recording / reproducing rotary magnetic head H2 in the return recording operation are formed. 7 to 1
In FIG. 1, in order to clarify the description of the reproducing operation, only one of the recording trace TA recorded and formed in the forward recording operation and the recording trace TB recorded and formed in the returning recording operation is hatched. Not applied.

First, FIGS. 7 (a) and 7 (b) and FIGS. 8 (a) and 8 (b) show recordings obtained by reciprocating recording operation with the running speed of the continuously running magnetic tape T set to V / 2. FIG. 10 is an explanatory diagram of a forward reproduction operation performed in a state where the completed magnetic tape T is continuously run in a forward direction at a running speed V. FIG. 7A shows a reproduction state in which the recording track TA1 of the recorded magnetic tape T is tracked by the first rotating magnetic head H1 for recording and reproduction. The first rotating magnetic head H
1 starts tracing the recording trace TA1 from the start end side of the recording trace TA1, and the first trace Du during the half rotation of the upper drum Du.
The rotary magnetic head H1 tracks the recording trace TA1 and reproduces the recording signal in the recording trace TA1. During the half rotation of the upper drum after the first rotary magnetic head H1 reaches the end of the recording mark TA1, the same azimuth angle as that of the first rotary magnetic head H1 for recording and reproduction is used. Fourth rotating magnetic head H4 for reproduction having a magnetic gap
However, as shown in FIG. 7B, the recording trace TA2 of the recorded magnetic tape T is traced, and the reproducing operation of the recording signal recorded in the recording trace TA2 is performed.

That is, the fourth rotating magnetic head H
4 indicates that the head track width Tw2 is the first track width.
Of the rotating magnetic head H1 has a magnetic gap having a relationship of Tw1 <Tw2 ≦ 2Tw1 with respect to the head track width Tw1, and as described above, recording from the recording trace TA1 by the first rotating magnetic head H1. During the half rotation period following the half rotation period of the upper drum Du in which the signal reproducing operation is performed, tracking is performed on both the recording trace TB and the recording trace TA2 adjacent to the recording trace TA1. By the way, as described above, the fourth rotating magnetic head H4 is
Since the second rotary magnetic head H2 used to form the recording trace TB has a magnetic gap having an azimuth angle different from that of the second rotating magnetic head H2, the recording gap TB and the recording trace TA2 are recorded on the recording trace as described above. , Only the recording signal of the recording trace TA2 is reproduced from the fourth rotating magnetic head H4.

Next, during the half rotation of the upper drum after the fourth rotating magnetic head H4 reaches the end of the recording mark TA2 as described above, the first rotating magnetic head H4 is turned on.
1 is a recorded magnetic tape T as shown in FIG.
Of the recording trace TA2, and the reproducing operation of the recording signal recorded in the recording trace TA2 is performed. During the half rotation of the upper drum after the first rotary magnetic head H1 reaches the end of the recording mark TA2, the fourth rotary magnetic head H4 performs the recording as shown in FIG. 8B. Then, both the recording trace TB and the recording trace TA3 adjacent to the recording trace TA2 on the completed magnetic tape T are tracked, and the reproducing operation of the recording signal recorded in the recording trace TA3 is performed.

In the same manner, in the forward reproduction operation performed while the recorded magnetic tape T is traveling at the traveling speed V in the forward direction, the first rotary magnetic head H1 used for recording during the forward recording operation is used. A magnetic gap having the same azimuth angle as that of the first rotating magnetic head H1, and having a relationship of Tw1 <Tw2 ≦ 2Tw1 with respect to the head track width Tw1 of the first rotating magnetic head H1. With the fourth rotary magnetic head H4 for reproduction, the reproduction operation is performed twice for the successive recording traces TA formed on the magnetic tape T during the outward recording operation.

When the forward reproduction operation for the recorded magnetic tape T is completed, the main control unit 5 continuously rotates the recorded magnetic tape in the reverse direction at the traveling speed V in order to cause the magnetic recording / reproduction device to perform the return reproduction operation. Control information for driving the vehicle is given to the capstan control circuit 9, and a switching control signal is sent to the head switching circuit 4 so that the rotating magnetic head H2 and the rotating magnetic head H3 are used for a reproducing operation. Is supplied to the tilt control unit 7 so that the rotation trajectory of the rotary magnetic head matches the recording trace on the magnetic tape T.

As a result, the recorded magnetic tape T is continuously running in the reverse direction (the direction of the arrow -b in the figure), and the switching operation of the head switching circuit 4 causes the rotating magnetic head H2 and the rotating magnetic head H2 to rotate. The magnetic head H3 is used for the reproducing operation. Further, the tilt control unit 7 records the rotation trajectories of the rotary magnetic heads H2 and H3 used for reproduction on the recorded magnetic tape T.
A control operation is performed so as to match the upper recording trace.

FIGS. 9 (a) and 9 (b) and FIGS. 10 (a) and 10 (b) show recorded magnetic data obtained by reciprocating recording operation with the running speed of the continuously running magnetic tape T set to V / 2. FIG. 9 is an explanatory diagram of a reproduction operation on a return path performed in a state where the tape T is continuously run in a reverse direction at a running speed V. FIG. 9A shows a reproduction state in which the recording track TB1 of the recorded magnetic tape T is tracked by the second rotary magnetic head H2 for recording and reproduction. The second rotating magnetic head H
2 starts tracking the recording trace TB1 from the start end side of the recording trace TB1, and during the period in which the upper drum Du rotates a half turn,
The rotary magnetic head H2 traces the recording trace TB1 and reproduces the recording signal in the recording trace TB1. During the half rotation of the upper drum after the second rotary magnetic head H2 reaches the end of the recording trace TB1, the same azimuth angle as the second rotary magnetic head H2 for recording and reproduction is used. Third rotating magnetic head H3 for reproduction having a magnetic gap
However, as shown in FIG. 9B, the recording track TB1 of the recorded magnetic tape T is tracked, and the recording signal recorded on the recording track TB1 is reproduced.

That is, in the third rotating magnetic head H3, the head track width Tw2 is in a relationship of Tw1 <Tw2 ≦ 2Tw1 with respect to the head track width Tw1 of the second rotating magnetic head H2. Since there is a certain magnetic air gap, as described above, a half rotation period following the half rotation period of the upper drum Du in which the operation of reproducing the recording signal from the recording trace TB1 by the second rotating magnetic head H2 is performed. Then, the above-mentioned recording trace TB1 and the recording trace TA adjacent thereto are traced on the recording trace. By the way, as described above, the third rotating magnetic head H3 is the first rotating magnetic head H1 used for forming the recording mark TA.
Therefore, even if the recording track TA and the recording track TB1 are traced on the recording track as described above, the recording track is not transmitted from the third rotating magnetic head H3. Only the recording signal of TB1 is reproduced.

Next, during the half rotation of the upper drum after the third rotating magnetic head H3 reaches the end of the recording track TB1 as described above, the second rotating magnetic head H3 is turned on.
2 traces the recording trace TB2 of the recorded magnetic tape T as shown in FIG. 10A, and performs a reproducing operation of the recording signal recorded in the recording trace TB2. During the half rotation of the upper drum after the second rotating magnetic head H2 reaches the end of the recording trace TB2, the third rotating magnetic head H3 performs the recording as shown in FIG. The recording operation of the recording signal recorded on the recording trace TB2 is performed by tracking both the recording trace TB2 on the completed magnetic tape T and the recording trace TA adjacent thereto.

In the same way, in the backward path reproducing operation performed while the recorded magnetic tape T is traveling at the traveling speed V in the reverse direction, the second rotary magnetic head H2 used for recording during the backward path recording operation is similarly operated. A magnetic gap having the same azimuth angle as that of the second rotating magnetic head H2 and having a relationship of Tw1 <Tw2 ≦ 2Tw1 with respect to the head track width Tw1 of the second rotating magnetic head H2. With the reproducing third rotating magnetic head H3, the reproducing operation is performed twice on the sequential recording traces TB formed on the magnetic tape T at the time of the backward recording operation.

Next, referring to FIGS. 11A and 11B, the recorded magnetic tape T is transported intermittently, and the recorded magnetic tape T is stopped while the recorded magnetic tape T is stopped.
A case where a recording signal is reproduced by a rotating magnetic head will be described. The main control unit 5 provides the capstan control circuit 9 with control information for causing the magnetic recording / reproducing device to intermittently transfer the recorded magnetic tape in the forward direction,
Further, a switching control signal is supplied to the head switching circuit 4 so that the rotating magnetic head H2 and the rotating magnetic head H3 are used for the reproducing operation. Control information for matching the recording trace is supplied to the tilt control unit 7.

Thus, each time the recorded magnetic tape T is intermittently transported in the forward direction, it is stopped. At the same time, the switching operation of the head switching circuit 4 causes the rotating magnetic head H1 and the rotating magnetic head H4 to rotate. Is used for the reproducing operation. Further, the tilt control unit 7 performs a control operation such that the rotation trajectories of the rotary magnetic heads H1 and H4 used for reproduction match the recording traces on the recorded magnetic tape T.

FIGS. 11A and 11B show the first rotary magnetic head H1 and the fourth rotary magnetic head H during the stop state of the recorded magnetic tape T which is intermittently transported in the forward direction. FIG. 14 is an explanatory diagram of an outward reproduction operation performed by H4. In FIG. 11A, the recorded magnetic tape T
The first rotating magnetic head H for recording and reproducing the recording trace TA1
1 shows a playback state being tracked. The first rotating magnetic head H1 starts tracking the recording trace TA1 from the start end side of the recording trace TA1, and the first rotating magnetic head H1 moves the recording trace TA during the half rotation of the upper drum Du. TA
1 and the recorded signal in the recording trace TA1 is reproduced. During the half rotation of the upper drum after the first rotating magnetic head H1 reaches the end of the recording trace TA1, the magnetic gap having the same azimuth angle as that of the recording and reproducing first rotating magnetic head H1 is used. The fourth rotary magnetic head H4 for reproduction having the following traces the recording trace TA1 of the recorded magnetic tape T as shown in FIG. 11 (b), and the recording signal recorded in the recording trace TA1. Is performed.

As described above, during the period in which the upper drum Du makes a plurality of rotations with respect to one recording trace TA1 formed by the outward recording operation on the recorded magnetic tape T in the stopped state, the first rotation is performed. After the rotating magnetic head H1 and the fourth rotating magnetic head H4 reproduce the recording signal a plurality of times, the recorded magnetic tape T is rapidly moved forward (leftward in FIG. 11) by a distance corresponding to two track pitches. Transfer to Then, the first rotary magnetic head H1 and the fourth
The rotary magnetic head H4 reproduces the recording signal from the recording trace TA next to the recording trace TA1 (the recording trace TA on the right side of the recording trace TB on the right side of the recording trace TA1 in FIG. 11) a plurality of times. . Then, the sequential recording marks T by the first rotating magnetic head H1 and the fourth magnetic head H4 are sequentially recorded.
The reproduction operation for A a plurality of times is performed every stop period after the recorded magnetic tape T is intermittently transported in the forward direction, and the reproduction operation on the outward path is completed. The number of times the reproducing operation is to be performed on the sequential recording trace TA by the first rotating magnetic head H1 and the fourth magnetic head H4 is determined by one of the still images obtained as the reproduced image. It is determined according to the projection time of the piece.

When the outward reproduction operation for the recorded magnetic tape T is completed, the main control unit 5 intermittently transports the recorded magnetic tape in the reverse direction in order to cause the magnetic recording / reproducing apparatus to perform the backward reproduction operation. To the capstan control circuit 9 and supply a switching control signal to the head switching circuit 4 so that the rotating magnetic head H2 and the rotating magnetic head H3 are used for the reproducing operation. The rotating magnetic head H2 and the rotating magnetic head H3 are used for the reproducing operation. However, in the operation mode in which the reproducing operation from the recorded magnetic tape T is performed during the stop period of the recorded magnetic tape T as described above, regardless of whether the direction of transport of the recorded magnetic tape T is reversed. Since the relationship between the rotation locus of the rotating magnetic head and the recording trace on the magnetic tape T does not change, even if the transport direction of the recorded magnetic tape T is changed from the forward direction to the reverse direction, the tilt correction by the tilt control unit 7 No action is taken.

During the reproduction operation on the return path, during the stop state of the recorded magnetic tape T which is intermittently transported in the reverse direction, the second
The return path reproducing operation performed by the rotating magnetic head H2 and the third rotating magnetic head H3 of FIG.
Since it can be easily understood from the reproduction operation of the forward path described above with reference to (b), description with particular reference to the drawings will not be made. In the reproduction operation on the return path, the second rotating magnetic head H2 tracks the recording mark TB from the start end side of one recording mark TB recorded and formed by the second rotating magnetic head H2 for recording and reproduction during the outward recording operation. Start, and the second rotating magnetic head H
2 reproduces the recording signal in the recording trace TB.

During the half rotation of the upper drum after the second rotating magnetic head H2 reaches the end of the recording trace TB, the second rotating magnetic head H2 for recording and reproduction is used. A third rotating magnetic head H3 for reproduction having a magnetic gap with the same azimuth angle tracks the above-mentioned recording trace TB on the recorded magnetic tape T and performs a reproducing operation of a recording signal. During one rotation of the upper drum Du for one recording trace TB on the recorded magnetic tape T in the stopped state, a recording signal is generated by the second rotating magnetic head H2 and the third rotating magnetic head H3. After being reproduced twice, the recorded magnetic tape T is rapidly transported in the reverse direction by a distance corresponding to two track pitches.

After the recorded magnetic tape T is stopped, the second rotating magnetic head H2 moves the next recording mark TB after the recording mark TB during the half rotation of the next upper drum Du. Playback operation of the recorded signal from the
During a half rotation period following the upper drum Du half rotation period, the third rotating magnetic head H3 records the recording mark T.
The recording signal from B is reproduced. The reproducing operation by the second rotating magnetic head H2 and the third magnetic head H3 is performed sequentially at each stop period after the recorded magnetic tape T is intermittently transferred in the reverse direction. This is performed for TB, and the reproduction operation on the return path ends.

If the recording (reproducing) operation on the outward path and the recording (reproducing) operation on the return path are repeatedly performed on the recorded magnetic tape T, the recorded magnetic tape T can be used as an endless tape. Needless to say, it can be used for:

FIG. 2B and FIGS. 12A to 12C.
Shows different arrangement examples of the first to fourth rotating magnetic heads H1 to H4 used in the magnetic recording and reproducing apparatus of the present invention. The rotating magnetic heads H1 to H1 shown in FIG.
The arrangement mode of H4 is an arrangement mode in which the lower ends of the magnetic gaps in the respective rotary magnetic heads H1 to H4 are aligned at the same height in the direction of the center axis of the drum.
The arrangement of the rotating magnetic heads H1 to H4 shown in FIG. 12A is such that the upper ends of the magnetic gaps in the rotating magnetic heads H1 to H4 are aligned at the same height in the direction of the center axis of the drum. It is an arrangement mode in the case of doing.

Further, the arrangement of the rotating magnetic heads H1 to H4 shown in FIG. 12 (b) is different from the first rotating magnetic head H1 and the second rotating head provided at the same height in the direction of the center axis of the drum. In contrast to the magnetic head H2, the upper ends of the magnetic gaps of the third rotating magnetic head H3 and the first rotating magnetic head H1 are aligned at the same height in the direction of the center axis of the drum. In this case, the fourth rotating magnetic head H4 and the second rotating magnetic head H2 have the same lower end of the magnetic gap in the direction of the center axis of the drum. The arrangement is such that the height is aligned.

Further, the arrangement of the rotary magnetic heads H1 to H4 shown in FIG. 12C is such that the first rotary magnetic head H1 provided at the same height in the direction of the center axis of the drum.
The second rotating magnetic head H2 and the third rotating magnetic head H3 and the first rotating magnetic head H1 have the same lower end of the magnetic gap in the direction of the center axis of the drum. Of the fourth rotating magnetic head H4 and the second rotating magnetic head H2, the upper end of each magnetic gap is positioned at the center axis of the drum. In the same direction in the same direction.

FIG. 2B and FIGS. 12A to 12C.
Tp shown therein is a recording track interval (track pitch) recorded on the recorded magnetic tape T, and Tw1 is a magnetic field between the first rotating magnetic head H1 and the second rotating magnetic head H2. The head track width of the gap,
Further, Tw2 indicates the head track width of the magnetic gap between the third rotating magnetic head H3 and the fourth rotating magnetic head H4. In the configuration example shown in each of the drawings described above, the first
The head track width Tw1 and the track pitch of the magnetic gap between the rotating magnetic head H1 and the second rotating magnetic head H2 are the same, but in the embodiment of the present invention, the first rotating magnetic head The head track width Tw1 of the magnetic gap between H1 and the second rotating magnetic head H2 may be slightly smaller than the track pitch Tp.

Also, the head track width T of the magnetic gap between the third rotating magnetic head H3 and the fourth rotating magnetic head H4.
An example is shown in which w2 is set to twice the head track width Tw1 of the magnetic gap between the first rotating magnetic head H1 and the second rotating magnetic head H2. The head track width Tw2 of the magnetic gap with the fourth rotating magnetic head H4 is Tw1 <Tw2 ≦ 2Tw1.
May be set within the range. The head track width Tw2 of the magnetic gap between the third rotating magnetic head H3 and the fourth rotating magnetic head H4 is set to the head track width Tw2 of the magnetic gap between the first rotating magnetic head H1 and the second rotating magnetic head H2. If the width is slightly smaller than twice the width Tw1, the end of the magnetic gap between the third rotating magnetic head H3 and the fourth rotating magnetic head H4 and the first rotating magnetic head H1
It is not necessary to align the end of the magnetic gap with the second rotating magnetic head H2.

The main control unit (system controller) 5 shown in FIG. 1 includes, for example, a microprocessor, a read only memory (RAM), a read only memory (ROM).
What is comprised including etc. can be used. Also,
When the recording signal to be recorded on the magnetic tape T by the recording / reproducing rotary magnetic heads H1 and H2 is an analog signal, the recording / reproducing signal processing unit 3 converts the recording target signal supplied to the input terminal 1 into, for example, a frequency signal. A recording signal in the form of an analog signal of the modulated wave signal is generated and supplied to the signal switching circuit 4.

When the recording signal to be recorded on the magnetic tape T is a digital signal, the recording target signal supplied to the input terminal 1 during the recording operation is converted into a digital signal, and then a DCT block is formed. DCT operation processing,
Quantization and variable length coding, addition of an error correction code, and other various necessary signal processing are performed to record the insert information area, audio signal area, video signal area, The recording data is output as a recording signal as recording data of a signal format in a state divided into respective areas such as a code area. The recording signal is supplied to the rotating magnetic head via a head switch.

During the reproducing operation, each of the rotating magnetic heads H1 to H4
The reproduction signal reproduced by the above is supplied to the recording / reproduction signal processing unit 3 via the head switching circuit 4. When the reproduction signal reproduced by the rotating magnetic head is an analog signal, the reproduction signal is output to the output terminal 2 after the demodulation operation and other predetermined signal processing are performed in the recording / reproduction signal processing unit 3. When the reproduced signals reproduced by the rotary magnetic heads H1 to H4 are digital signals, the recording / reproducing signal processing unit 3 performs waveform equalization of the reproduced signals by a waveform equivalent circuit. Digital data is stored in a memory via a code detection circuit and a phase locked loop (PLL). The digital data in the digital memory is read out at a read permission signal timing supplied from the main control unit 5 and then read on a time axis. The bit stream is arranged in a serial manner, signal processing for error correction is performed in an error correction circuit, and then the variable length decoding unit Digital data No. is conducted by outputting the inverse DCT in the inverse DCT circuit is stored in conducted in the frame memory, the digital data read out from the frame memory are sent to the output terminal 2.

[0093]

As is apparent from the above description, the magnetic recording / reproducing apparatus of the present invention performs the reciprocating recording operation by sequentially changing the running direction of the magnetic tape of the helical scan type VTR. When performing an endless recording operation, a time-lapse VTR capable of rewriting the oldest information to new information can be configured to be able to be used also as a VTR of the current standard configuration, and the recording density by the standard recording operation The same recording density as described above can be ensured, and there is no need to make a drastic change to the current VTR to configure it so that it can also be used as the VTR of the current standard configuration. In addition to the above, the SP and the EP modes can be compatible as a standard configuration VTR. The advantage is that a magnetic recording / reproducing apparatus which can perform stalk reproduction and still reproduction satisfactorily and can easily realize high-density recording / reproduction without guard bands can be provided with a minimum number of rotating magnetic heads. Having.

[Brief description of the drawings]

FIG. 1 is a block diagram of a magnetic recording / reproducing apparatus according to the present invention.

FIG. 2 is a diagram showing an example of the arrangement of a rotating magnetic head.

FIG. 3 is a diagram for explaining an operation mode of a head switching circuit.

FIG. 4 is a diagram showing a schematic configuration of a tilt mechanism unit.

FIG. 5 is a block diagram illustrating a configuration example of a capstan control circuit.

FIG. 6 is a diagram showing a recording trace pattern for explaining a reproducing operation.

FIG. 7 is a diagram showing a recording trace pattern for explaining a reproducing operation.

FIG. 8 is a diagram showing a recording trace pattern for explaining a reproducing operation.

FIG. 9 is a diagram showing a recording trace pattern for explaining a reproducing operation.

FIG. 10 is a diagram showing a recording trace pattern for explaining a reproducing operation.

FIG. 11 is a diagram showing a recording trace pattern for explaining a reproducing operation.

FIG. 12 is a diagram showing an example of the arrangement of a rotating magnetic head.

[Explanation of symbols]

Du: upper drum, Dd: lower drum, Lr: guide member (lead ring) for regulating the running position of the magnetic tape, T: magnetic tape, G: guide portion (position regulating surface) of the reference edge of the magnetic tape, H1, H2 , H3, H4 ... rotating magnetic head, DB
... Drum base, Hc ... Control head, SW1
SW3, 37: switch, 3: recording / reproducing signal processing circuit, 4: head switching circuit, 5: main controller (system controller), 6: drum controller, 7: tilt controller, 8 ...
CTL signal recording / reproducing circuit, 9 ... capstan control circuit,
10: capstan motor, 11, 30: signal generator,
12: central axis, 13: outer peripheral portion below lower drum Dd, 2
0 to 23: pivot point, 34: counter, 35: intermittent drive voltage generation circuit, 36: tracking control circuit, 38: drive circuit, 39: phase comparator, 40: adder, 41: phase compensation circuit, 42 ... Frequency voltage converter (F / V converter),

Claims (2)

[Claims] 1. A center axis of symmetry about a center axis of an upper drum driven and rotated in a predetermined rotation direction at a predetermined rotation speed.
A case in which parallel recording marks of a predetermined track pattern are recorded and formed on a magnetic tape by alternately using one rotating magnetic head for recording / reproduction arranged at a position symmetrical to 0 degrees. When the running speed of the magnetic tape is V, V
In the state where the magnetic tape is continuously run in the forward direction at a running speed of / n, one of the rotary magnetic heads for recording and reproduction is used to record and form a recording mark on the magnetic loop, and V / n In the state where the magnetic tape is continuously run in the reverse direction at the running speed, when a recording mark is recorded and formed on the magnetic tape by the other one of the rotary magnetic heads for recording and reproduction, the predetermined The above-mentioned rotary magnetic head for recording / reproducing, in which parallel sequential recording marks of the track pattern are recorded and formed on the magnetic tape, or when the magnetic tape is intermittently transported in the forward direction at each stop. A recording mark is formed on the magnetic tape by one of the above-mentioned methods, and at the time when the magnetic tape being intermittently conveyed in the reverse direction is stopped, other than the above-described rotary magnetic head for recording and reproduction, A helical scan that performs a time-lapse recording operation such that when a recording mark is recorded and formed on a magnetic tape, parallel sequential recording marks of the predetermined track pattern are recorded and formed on the magnetic tape. Recording / reproducing apparatus for reproducing a recorded magnetic tape created by a magnetic recording / reproducing apparatus having a first azimuth angle and forming a recording mark having a predetermined recording mark width on a magnetic tape. A first recording / reproducing first magnetic disk having a magnetic gap having a head track width Tw1
A rotating magnetic head having a second azimuth angle different from that of the first rotating magnetic head and having a magnetic gap having a head track width Tw1.
And the rotary magnetic head are disposed at the same mounting height at 180-degree symmetrical positions about the center axis of the drum, and further have a second azimuth angle, and have the head track width described above. For Tw1, Tw1 <Tw2 ≦ 2Tw
The reproducing third rotary magnetic head having the magnetic gap having the head track width Tw2 having the relationship of 1 is separated from the first rotary magnetic head by a predetermined minute interval in the circumferential direction of the drum. The one end of the magnetic gap is located near one side edge of the magnetic gap of the first rotating magnetic head in a direction parallel to the center axis of the drum, and the second rotation The magnetic head of the third magnetic head is arranged so that the entirety of the rotation path of the magnetic gap in the width direction is included in a part of the rotation path of the magnetic gap of the third rotating magnetic head. With respect to the magnetic head, at the position symmetrical with respect to the center of the drum by 180 degrees with respect to the center axis of the drum, the second magnetic head for reproduction having the first azimuth angle and having a magnetic gap having a head track width Tw2. 4 rotating magnetic head Is located near one side edge of the magnetic gap of the second rotating magnetic head in a direction in which one end of the magnetic gap is parallel to the center axis of the drum, and The upper drum, which is arranged in such a manner that the whole of the rotation path of the magnetic gap of the magnetic head in the width direction is included in a part of the rotation path of the magnetic gap of the fourth rotary magnetic head, is predetermined. Means for rotating at a specific number of rotations only in a specific direction of rotation, and the angle between the rotation locus of each rotary magnetic head and the reference edge of the magnetic tape,
Means for controlling the magnetic tape to be at the same predetermined angle regardless of whether the magnetic tape is transported in the forward direction or the reverse direction. A second) rotating magnetic head;
When the reproducing operation is performed using the (or third) rotating magnetic head, and when the magnetic tape is intermittently transported in the reverse direction, the second (or first) rotating magnetic head is used. A magnetic recording / reproducing apparatus comprising: a rotating magnetic head; and means for performing a reproducing operation using a third (or fourth) rotating magnetic head. 2. A center of symmetry about the center axis of an upper drum driven and rotated in a predetermined rotation direction at a predetermined rotation speed.
A case in which parallel recording marks of a predetermined track pattern are recorded and formed on a magnetic tape by alternately using one rotating magnetic head for recording / reproduction arranged at a position symmetrical to 0 degrees. When the running speed of the magnetic tape is V, V
In the state where the magnetic tape is continuously run in the forward direction at a running speed of / n, one of the rotary magnetic heads for recording and reproduction is used to record and form a recording mark on the magnetic loop, and V / n In the state where the magnetic tape is continuously run in the reverse direction at the running speed, when a recording mark is recorded and formed on the magnetic tape by the other one of the rotary magnetic heads for recording and reproduction, the predetermined The above-mentioned rotary magnetic head for recording / reproducing, in which parallel sequential recording marks of the track pattern are recorded and formed on the magnetic tape, or when the magnetic tape is intermittently transported in the forward direction at each stop. A recording mark is formed on the magnetic tape by one of the above-mentioned methods, and at the time when the magnetic tape being intermittently conveyed in the reverse direction is stopped, other than the above-described rotary magnetic head for recording and reproduction, A helical scan that performs a time-lapse recording operation such that when a recording mark is recorded and formed on a magnetic tape, parallel sequential recording marks of the predetermined track pattern are recorded and formed on the magnetic tape. Recording / reproducing apparatus for reproducing a recorded magnetic tape created by a magnetic recording / reproducing apparatus having a first azimuth angle and forming a recording mark having a predetermined recording mark width on a magnetic tape. A first recording / reproducing first magnetic disk having a magnetic gap having a head track width Tw1
A rotating magnetic head having a second azimuth angle different from that of the first rotating magnetic head and having a magnetic gap having a head track width Tw1.
And the rotary magnetic head are disposed at the same mounting height at 180-degree symmetrical positions about the center axis of the drum, and further have a second azimuth angle, and have the head track width described above. For Tw1, Tw1 <Tw2 ≦ 2Tw
The reproducing third rotary magnetic head having the magnetic gap having the head track width Tw2 having the relationship of 1 is separated from the first rotary magnetic head by a predetermined minute interval in the circumferential direction of the drum. The one end of the magnetic gap is located near one side edge of the magnetic gap of the first rotating magnetic head in a direction parallel to the center axis of the drum, and the second rotation The magnetic head of the third magnetic head is arranged so that the entirety of the rotation path of the magnetic gap in the width direction is included in a part of the rotation path of the magnetic gap of the third rotating magnetic head. With respect to the magnetic head, at the position symmetrical with respect to the center of the drum by 180 degrees with respect to the center axis of the drum, the second magnetic head for reproduction having the first azimuth angle and having a magnetic gap having a head track width Tw2. 4 rotating magnetic head Is located near one side edge of the magnetic gap of the second rotating magnetic head in a direction in which one end of the magnetic gap is parallel to the center axis of the drum, and The upper drum, which is arranged in such a manner that the whole of the rotation path of the magnetic gap of the magnetic head in the width direction is included in a part of the rotation path of the magnetic gap of the fourth rotary magnetic head, is predetermined. Means for rotating at a specific number of rotations only in a specific direction of rotation, and the angle between the rotation locus of each rotary magnetic head and the reference edge of the magnetic tape,
Means for controlling the magnetic tape to be transported at the same predetermined angle regardless of whether the magnetic tape is transported in the forward direction or the reverse direction, and when the magnetic tape is traveling in the forward direction at nV (where n is a natural number). Is a recording mark formed by the first (or second) rotating magnetic head using the first (or second) rotating magnetic head and the fourth (or third) rotating magnetic head. Is performed, and when the magnetic tape is running at nV in the reverse direction, the second (or first) rotating magnetic head and the third (or fourth) rotating magnetic head are Using a magnetic head, the second
Means for performing a reproducing operation on a recording mark recorded and formed by the (or first) rotary magnetic head.