JPH1023367A - Magnetic recording and reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the deterioration of image quality at the time of reproduction by correcting the number of revolutions of a rotary magnetic head and a drive speed of a magnetic tape attended with an N-multiple speed recording. SOLUTION: When the operator uses an operation means to instruct recording of an N-multiple speed to a CPU 46, the CPU 46 gives the information to a CPU 60 and conducts track correction control and read correction control to tilt a tape guide drum 10 and a read ring 12 at an angle matching the N- multiple speed recording mode. On the other hand, the CPU 60 calculates a corrected number of revolutions of an upper drum 10a and a corrected drive speed of a magnetic tape based on the information of the N-multiple speed recording mode received from the CPU 46. Then the CPU 60 controls a drum motor 26 and a capstan motor 65 based on the corrected number of revolutions of the drum 10a and the corrected drive speed of the magnetic tape. The interval of horizontal synchronizing signals recorded on the tape is corrected into a regular interval through the correction and a recording track with the entirely same form as the case with recording in the standard recording mode is realized.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a helical scan type magnetic recording / reproducing apparatus, and more particularly to a high-speed dubbing technique for running a magnetic tape at a speed higher than a standard speed and simultaneously recording a plurality of tracks on the magnetic tape.

[0002]

2. Description of the Related Art First, referring to FIGS. 1 to 4, a VHS which is an example of a helical scan type magnetic recording / reproducing apparatus will be described.
A (registered trademark) VTR will be briefly described. FIG. 1 is a perspective view showing a main part of a typical tape running system of a VHS system VTR, and FIG. 2 is a front view thereof. FIG.
Is a plan view as seen from the direction of the drum shaft 11. FIG. In addition,
3, the entrance side guide roller 13 and the exit side guide roller 14 in FIG. 1 are omitted. In FIG. 3, a straight line L1 is a straight line that bisects a range where the magnetic tape T is wound around the tape guide drum 10 through the drum shaft 11, and a straight line L2 is a straight line orthogonal to the straight line L1.

[0003] In the following description, the drum shaft 1
By using counterclockwise angular coordinates with the axis 1 as the origin and the direction of the straight line L2 extending to the left from the axis as 0 °, the angular position at which each component is arranged, the tape guide drum The cross-sectional direction of the cross-sectional view of FIG. 10 may be specified and described. For example, in the case of a sectional view of the tape guide drum 10 cut along the straight line L1, the sectional view
It is called a -270 degree cross section. In each sectional view, the left side in the paper corresponds to the direction of 90 degrees displayed earlier, and the right side in the paper corresponds to the direction of 270 degrees displayed later.

The VTR includes an upper drum 10a provided on a drum base 17 at an angle φ with respect to a vertical line Z.
Guide drum 10 consisting of a lower drum 10b
And the tape guide drum 1 in the running direction of the magnetic tape T.
Entrance side guide roller 1 located on the entrance side with respect to 0
3. An inclined pole 1, an exit side guide roller 14 located on an exit side with respect to the tape guide drum 10 in a running direction of the magnetic tape T, an inclined pole 2, and the like. Then, the magnetic tape T is pulled out from the supply reel 3 of the tape cassette 20, abuts on the erasing head 4 and the impedance roller 5, and is substantially 18 regulated by the inclined poles 1 and 2.
The tape is wound obliquely around the peripheral surface of the tape guide drum 10 over a range of 0 degrees, and then the audio control head 6
To the take-up reel 9 of the tape cassette 20
, And is driven by being pinched and driven by the pinch roller 8 and the capstan 7.

At this time, a recording trace pattern as shown in FIG. 4 is formed on the magnetic tape T by the magnetic heads Ha and Hb mounted on the upper drum 10a. In the figure, a straight line connecting a point indicated as “start point” on the lower end edge Tb of the magnetic tape T, a point indicated as +1 on the upper end edge Ta of the magnetic tape T, and a large number of lines parallel to this straight line. The straight line is
It shows the center of each track pattern. And
Magnetic tape T on which such a track pattern is formed
Is reproduced while being transported at the same speed in the same direction as during recording, the magnetic heads Ha and Hb trace on each of these tracks, and normal reproduction is performed. However, if the traveling speed or direction of the magnetic tape T during reproduction is different from that during recording, the relative linear velocity between the magnetic tape T and the magnetic heads Ha and Hb changes. Are different from each other as shown by, for example, FF, STILL, and FB in FIG.

Here, straight lines indicated by FF, FB, and STILL are, for example, 7 lines when the magnetic tape T is recorded on the magnetic tape T, respectively.
A track pattern when the magnetic tape T is run at double speed, a track pattern when the magnetic tape T is run at −7 times the speed at the time of recording, and a track pattern when the magnetic tape T is stopped.

As a specific example of the track pattern, a VHS system VTR is as follows. That is, in the most common VHS type VTR, the magnetic tape T travels in a state where the magnetic tape T is obliquely wound around 180 degrees around a rotating drum having a diameter of 62 mm which rotates at 1800 revolutions per minute. And in standard mode recording,
The magnetic tape is transported at a rate of 33.35 mm per second, and the recording mark drawn on the magnetic tape T by the magnetic head having a track width of 58 μm is 5 ° 5 ° with respect to the lower edge Tb of the magnetic tape T.
An 8'9.9 "video track angle is formed.

Conventionally, when such a VTR is used to make a large number of duplicates of a recorded magnetic tape (dubbing), the recorded magnetic tape is reproduced by one VTR, and the reproduced signal is transmitted to a plurality of VTRs. In general, recording is performed by the plurality of VTRs at the same time to obtain a plurality of duplicated tapes. However, in this method, since recording and reproduction are performed in real time, it takes at least 2 hours to make a copy of a magnetic tape on which a movie is recorded for 2 hours, for example. Had certain limitations.

Here, the following two methods are conceivable for recording data at a speed higher than real time by using a helical scan type magnetic recording / reproducing apparatus using a rotating magnetic head. The running speed of the magnetic tape is set to N times the standard running speed (N ≧
At the same time as running in 2), the rotational speed of the rotary magnetic head is set to N times the standard rotational speed. The running speed of the magnetic tape is set to N times the standard running speed (N ≧
In step 2), the number of rotating magnetic heads is increased N times. At this time, a tape traveling system such as a lead for guiding the magnetic tape, a drum entrance, and an inclined pole at the exit is set to be exclusively used at N times speed so that a predetermined tape pattern can be obtained. Then, signals to be recorded simultaneously and in parallel are supplied to these magnetic heads at a predetermined timing.

[0010]

However, in the above method, the number of rotations of the rotary magnetic head is increased, and problems such as wear of the head, contact of the head, and life of the bearing are caused. In addition, the recording frequency becomes higher, and the magnetic head and the recording / reproducing amplifier are required to have very high frequency characteristics. Further, in the above method, since the tape traveling system is set for exclusive use of the N-times speed, there is a problem that the recording and reproduction cannot be performed by traveling the magnetic tape at the standard speed.

[0011]

Means for Solving the Problems The present invention has been made in view of the above problems, and the invention according to claim 1 is based on the fact that "the upper drum and the lower drum are wound around a part of the peripheral surface thereof. In a helical scan type magnetic recording / reproducing apparatus for recording / reproducing an inclined track on a running magnetic tape by using a rotating magnetic head, 2N (N ≧ 2) rotating magnetic heads are separated from the upper and lower drums. A body taper, and a guide portion for regulating the position of a magnetic tape that is disposed close to the outer peripheral surface of the small diameter portion formed at the lower portion of the lower drum and regulates the position of the reference edge of the magnetic tape; First tilt drive means for integrally tilting the upper and lower drums and the rotation trajectory surface of the rotary magnetic head with respect to the guide portion for regulating the position of the magnetic tape; and a guide portion for regulating the position of the magnetic tape. Second inclination driving means for inclining the Tilt angle detecting means for detecting the tilt angle of the rotational trajectory surface of the rotary magnetic head by the tilt driving means and the tilt angle of the guide portion for regulating the position of the magnetic tape by the second tilt driving means; The first tilt control means for controlling the first tilt drive means and the second tilt drive means so that the maximum value is obtained, and N or N + 1 rotary magnetic heads in sliding contact with the magnetic tape. A signal supply means for individually supplying a signal to be recorded; and a standard tape on which an accurate inclined track is recorded in advance, at a standard running speed of N
The tilt angle and the position of the magnetic tape on the rotation locus surface of the rotary magnetic head, which are determined by the first tilt control means and detected by the tilt angle detection means, when the data is reproduced at a double speed. A memory means for holding the inclination angle of the regulating guide, and a magnetic tape at a standard running speed of N
When recording while traveling at double speed, the second rotation is performed based on the inclination angle of the rotation trajectory surface of the rotating magnetic head held by the memory means and the inclination angle of the position regulating guide portion of the magnetic tape. A magnetic recording / reproducing apparatus comprising at least a first inclination driving means and a second inclination control means for controlling the second inclination driving means. "

According to a second aspect of the present invention, there is provided a helical scan for recording / reproducing an inclined track on a magnetic tape running around a part of a peripheral surface of an upper drum and a lower drum by using a rotating magnetic head. Type magnetic recording / reproducing apparatus, 2N (N ≧ 2) rotating magnetic heads, the upper and lower drums are separately formed, and the outer peripheral surface of a small diameter portion formed at the lower part of the lower drum. A guide portion for regulating the position of the magnetic tape, which is arranged in a close position to regulate the position of the reference edge of the magnetic tape; First tilt drive means for integrally tilting with respect to the regulating guide portion, second tilt drive means for tilting the position regulating guide portion of the magnetic tape, and the rotation by the first tilt drive means. Angle of inclination of the rotation locus plane of the magnetic head An inclination angle detecting means for detecting an inclination angle of the guide portion for regulating the position of the magnetic tape by the second inclination driving means; a first inclination driving means for maximizing a reproduction output; First tilt control means for controlling the tilt drive means, signal supply means for individually supplying signals to be recorded on the N or N + 1 rotary magnetic heads in sliding contact with the magnetic tape, and the rotary magnetic head The first inclination drive to set the inclination angle of the rotation locus surface and the inclination angle of the position regulating guide portion of the magnetic tape to a predetermined standard angle corresponding to a standard traveling speed of the magnetic tape. Second inclination control means for controlling the second inclination driving means, the inclination angle of the rotation locus surface of the rotary magnetic head and the inclination angle of the position regulating guide portion of the magnetic tape. At this standard angle, the magnetic tape A recording means for recording on the magnetic tape by running at a standard traveling speed; and when the magnetic tape recorded by the recording means is run at a speed N times a standard traveling speed and reproduced, the first Memory means for holding the tilt angle of the rotation trajectory surface of the rotary magnetic head and the tilt angle of the guide portion for regulating the position of the magnetic tape, which are determined by the tilt control means and detected by the tilt angle detecting means. And when the magnetic tape is run at a speed N times the standard running speed for recording, the tilt angle of the rotation locus plane of the rotary magnetic head held in the memory means and the position regulation of the magnetic tape. A magnetic recording / reproducing apparatus comprising at least a third tilt control means for controlling the first tilt drive means and the second tilt drive means based on the tilt angle of the guide unit. " To provide,

According to a third aspect of the present invention, there is provided a magnetic recording / reproducing apparatus according to the first or second aspect, wherein the upper drum is a rotary drum and the rotary magnetic head is mounted on the rotary drum. . "

According to a fourth aspect of the present invention, there is provided a method according to the first aspect, wherein an intermediate drum that rotates between the upper drum and the lower drum is provided, and the rotary magnetic head is mounted on the intermediate drum. Or the magnetic recording / reproducing device according to claim 2 ”.

According to a fifth aspect of the present invention, there is provided a magnetic recording / reproducing apparatus according to any one of the first to fourth aspects, wherein N is an odd number of 3 or more. ,

According to a sixth aspect of the present invention, there is provided a rotary magnetic head having an azimuth opposite to that of an arbitrary rotary magnetic head, when N is an even number of 2 or more. The magnetic recording / reproducing apparatus according to any one of claims 1 to 4, characterized in that:

According to a seventh aspect of the present invention, when the magnetic tape is recorded while running at a speed N times the standard running speed,
Calculating means for calculating the number of rotations of the rotary magnetic head and the running speed of the magnetic tape so that the interval between horizontal synchronization signals recorded on the magnetic tape is a predetermined value; When recording while traveling at a speed N times the traveling speed of the magnetic head, the rotational speed of the rotary magnetic head and the magnetic tape are calculated by calculating the rotational speed of the rotary head and the traveling speed of the magnetic tape. 7. The magnetic recording / reproducing apparatus according to claim 1, further comprising speed control means for controlling the speed so as to match the running speed. "

The invention according to claim 8 is characterized in that, when the magnetic tape is run at a speed N times the standard running speed and recorded,
Second memory means for storing a pre-calculated number of revolutions of the rotary magnetic head and a running speed of the magnetic tape so that the interval between horizontal synchronization signals recorded on the magnetic tape has a predetermined value. And the magnetic tape at a standard running speed of N
When recording at a double speed, the rotation speed of the rotary head and the travel speed of the magnetic tape are stored in the second memory means. 7. The magnetic recording / reproducing apparatus according to claim 1, further comprising speed control means for controlling the speed to match the running speed. ”.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. First, a mechanical configuration will be described with reference to FIGS. FIG.
Is a diagram schematically illustrating, as an example, the principle structure of a magnetic recording / reproducing device capable of performing double-speed recording or reproduction;
FIG. 2A shows fulcrums PT1 and PT2 and spacers G formed on a lead ring 12 for track correction described later.
FIG. 1B is a plan view showing the positional relationship between a fulcrum PL1 and a fulcrum PL2 formed on a drum base 17 and a spacer G2 and the like for lead correction described later, and FIG. It is sectional drawing which shows a cross section. FIG. 6 is a diagram showing a detailed configuration of the drum assembly DA, and FIG.
5A is a cross-sectional view taken along the line AA in FIG.
It is sectional drawing which shows B cross section, respectively. FIG. 7 is an exploded perspective view of main parts, and FIG.
3 is a cross-sectional view of the tape guide drum 10 and the lead ring 12 tilted clockwise during double-speed reproduction or double-speed recording.

First, a schematic configuration will be described with reference to FIG. The drum assembly DA includes a lead ring 12 placed on a drum base 17 and the lead ring 12.
The tape guide drum 10 includes an upper drum 10a and a lower drum 10b. The upper drum 10a, which rotates with the magnetic heads Ha, Hb, Hc, Hd mounted thereon, is supported by the drum shaft 11 coaxially with the lower drum 10b. In this example, the magnetic heads Ha, Hb, Hc, Hd are equidistant from each other (90 degrees).
Is attached to the upper drum 10a. The lead ring 12 is provided with a fulcrum PT1 in the 90-degree direction, a fulcrum PT2 in the 270-degree direction, and a spacer G1 in the 0-degree direction. The tape guide drum 10 is provided on these fulcrums PT1, PT2 and the spacer G1. Is placed. The drum base 17 has fulcrums PL1, 27 in the 90-degree direction.
A fulcrum PL2 is provided in the 0-degree direction, and a spacer G2 is provided in the 0-degree direction. The lead ring 12 is mounted on these fulcrums PL1, PL2 and the spacer G2. The urging means 23 provided on the drum shaft 11 connects the tape guide drum 10 and the lead ring 12 to the drum base 1.
It is biased in the direction of 7.

The drum base 17 and the lower drum 10b
5 and between the drum base 17 and the lead ring 12, biasing means 15 and 16 are provided, respectively, to move the lower drum 10b and the lead ring 12 counterclockwise in FIG. It is energizing. On the other hand, driving means 21 and 22 are provided in the direction of 0 degree of the lead ring 12 and the direction of substantially 0 degree of the drum base 17, respectively. The driving means 21 acts on the lower drum
Is rotatable clockwise with respect to the lead ring 12, and the drive means 22 is configured to act on the lead ring 12 to rotate the lead ring 12 clockwise with respect to the drum base 17.

Next, referring to FIGS. 6 to 8, the details of the mechanical structure will be further described. Magnetic heads Ha, H
The upper drum 10a on which b, Hc, and Hd are mounted is rotatably supported by the drum shaft 11 via bearings 24 and 25 so as to be coaxial with the lower drum 10b. Reference numeral 26 denotes a drum motor, which is a rotor 26a attached to the upper drum 10a.
And a stator 26b fixed to the drum shaft 11. Further, a rotary transformer 27 is provided on the upper drum 10a, and is arranged to face a rotary transformer 28 provided on the lower drum 10b, and exchanges signals with each other.

The lower drum 10b has a sliding surface 10 for magnetic tape.
b-1 and an annular portion composed of a small diameter portion 10b-2 having a smaller diameter than the magnetic tape sliding contact surface 10b-1 and a bottom portion 10b-3.
And a lower projection 10b-4. The small-diameter portion 10b-2 is arranged so as to be loosely fitted to the inner diameter of the annular portion 12a of the lead ring 12. The lower drum 10b further has positioning pins 10b-5 on its bottom surface 10b-3.
Are provided so as to protrude downward, and the positioning pin 10b is provided.
-5 is fitted in a through hole 33 formed in the bottom part of the lead ring 12 at a 270 degree direction with a slight clearance to position the lower drum 10b and the lead ring 12 in the rotation direction. The lead ring 12 has an annular portion 12a.
, A bottom portion 12b, and a central opening 12d having a knife-edge cross-sectional shape. Eccentricity between the lower drum 10b and the lead ring 12 is prevented.
The edge 12c of the annular portion 12a is the lower edge T of the magnetic tape T.
It functions as a lead L for guiding b.

In the lead ring 12, a spacer G1 and a tapped hole 31 are further provided in the direction of 0 degrees on the bottom surface portion 12b.
The fulcrum PT1 and the through hole 29 are formed in the direction of 90 degrees, the through hole 32 is formed in the direction of 180 degrees, and the fulcrum PT2 and the through holes 30 and 33 are formed in the direction of 270 degrees. Here, the fulcrum PT1, the fulcrum PT2, and the spacer G1 are connected to the bottom 12
Each of the convex portions has the same height with respect to b.
A straight line L3 connecting the fulcrum PT1 and the fulcrum PT2 (drum shaft 11
Pass through and parallel to the straight line L1) constitutes a rotation axis of the tape guide drum 10 with respect to the lead ring 12. In addition, the supporting points PT1, PT2 and the spacer G1 are simultaneously
The reference posture of the tape guide drum 10 with respect to the lead ring 12 is determined in the state where the tape guide drum 10 is in contact with the lead ring 12.

On the other hand, the drum base 17 has a spacer G2 and a through hole 34 in the direction of 0 degrees, a tap hole 35 in the vicinity of the through hole 34, a fulcrum PL1 in the direction of 90 degrees, and approximately 180 degrees. The coil springs 36 and 37 are
A fulcrum PL2 is provided in the direction of 0 degrees. Here, the fulcrum PL1 and the fulcrum PL2 respectively correspond to the upper protrusion P
L1a, PL2a, collars PL1b, PL2b, and lower projections PL1c, PL2c are configured as pin-shaped members.
L2c is press-fitted and fixed to the drum base 17. And the upper protrusions PL1a, PL2a of the fulcrums PL1, PL2.
Are fitted in the through holes 29 and 30 formed in the bottom surface portion 12b of the lead ring 12 with a slight clearance.

Here, the upper projection PL1 of the collar PL1b
The surface on the side a, the surface on the side of the upper projection PL2a of the collar PL2b and the surface of the spacer G2 form a predetermined same height with respect to the surface 17a of the drum base, and a straight line L4 connecting the fulcrum PL1 and the fulcrum PL2 (drum) Passes through the axis 11 and is parallel to the straight line L1)
Constitutes a rotation axis of the lead ring 12 with respect to the drum base 17. Further, the reference posture of the lead ring 12 with respect to the drum base 17 is determined in a state where the collars PL1b, PL2b and the spacer G2 are simultaneously in contact with the lead ring 12. The lower protrusion 10b of the lower drum 10b
-4, a leaf spring 38 is attached.
Arm portions 38a, 38b, 38c, 38d of the tape guide drum 1
0 and the lead ring 12 are urged downward. Also,
The coil spring 37 is provided in the through hole 3 of the lead ring 12.
2 and urges the lower drum 10b counterclockwise around the straight line L3.
This is to urge the lead ring 12 counterclockwise around the straight line L4.

On the other hand, the geared screw 39 passes through the through hole 34 of the drum base 17, is screwed into the tap hole 31 of the lead ring 12, is driven up and down by a motor 41, and has a lower drum end. The bottom surface 10b-3 of 10b can be pressed from below. Screw 4 with gear
Numeral 0 is screwed into the tap hole 35 of the drum base 17, driven vertically by the motor 41, and is displaced up and down, and its tip can press the bottom surface 12 b of the lead ring 12 from below. That is, as shown in FIG.
During double-speed recording, the geared screw 39 presses the lower drum 10 b against the urging force of the coil spring 37 provided between the drum base 17 and the lower drum 10 b to move the tape guide drum 10 against the lead ring 12. Is rotated clockwise around the straight line L3 so that the rotational trajectory surfaces of the rotary magnetic heads Ha and Hb match the track pattern of the magnetic tape T (hereinafter, depending on the running speed of the magnetic tape T, as described above). Lead L and magnetic head Ha,
The correction that changes the relative angle of Hb with the rotation locus plane is called “track correction”. ) Is performed. On the other hand, with the track correction, the lower end edge Tb of the magnetic tape T tends to be separated from the lead L or pressed against the lead L. Therefore, in order to eliminate such a tendency, the geared screw 40 presses the lead ring 12 against the urging force of the coil spring 36 provided between the drum base 17 and the lead ring 12, and the lead ring 12 is pressed. 1
2 is rotated clockwise around the straight line L4 so that the lower edge Tb of the magnetic tape T is along the lead L (hereinafter, this correction is referred to as "lead correction").

At the time of normal recording or normal reproduction in which the magnetic tape T is run at a standard speed for recording or reproduction, the tape guide drum 10 is connected to the lead ring 12 and the read ring 12 is connected to the drum base 17. Each is set to the reference posture. That is, as shown in FIG. 6A, the geared screw 39 is driven by the motor 41 and retracts downward in the figure to separate from the lower drum 10b, and the geared screw 40 is also driven by the motor 41 to move downward. Evacuate and separate from the lead ring 12. At this time, since the leaf spring 38 urges the tape guide drum downward, the lead ring 12 is stably held on a plane determined by the fulcrums PL1 and PL2 provided on the drum base 17 and the spacer G2. And the tape guide drum 10 is positioned below the lower drum 10.
b is a fulcrum PT1, PT2 formed on the lead ring 12
, And is stably held on a plane determined by the spacer G1 and becomes the reference posture.

Also, here, the geared screw 3
Although the configuration in which the motors 9 and 40 are driven by one motor 41 has been described, the screws 39 and 40 with gears may be driven by different motors. However, since there is a certain relationship between the track correction and the lead correction, the single motor 41 uses the geared screw 39,
40 can be controlled and driven, which is preferable from the viewpoint of reducing the number of parts and cost.

Next, a read ring 12 for recording by running the magnetic tape T at twice the standard running speed using the magnetic recording and reproducing apparatus described above with reference to FIGS. The control of the inclination angle of the tape guide drum 10 will be described. FIG. 9 is a block diagram of a control system for controlling the tilt angle. In the figure, 42 is an amplifier, 43 is a detector, 44 is a low-pass filter, 52 is an integrator, 45 is an A / D converter, and the rotary magnetic head H
a, Hb, Hc, and Hd are reproduced by the amplifier 4
After being amplified by 2 and envelope-detected by the detector 43, the signal is integrated by a low-pass filter 44, integrated by an integrator 52, converted to a digital signal by an A / D converter 45, and supplied to a system control CPU 46. You.

Reference numerals 47 and 48 denote motor drive amplifiers, respectively. The motor drive amplifier 47 drives the motor 41 based on the control signal of the CPU 46, and drives the geared screws 39 and 40 (the driving units 21 and 2) through the gear train 49.
By driving 2), the lead ring 12 and the tape guide drum 10 are inclined. 50 is the gear train 4
9 is a reference position sensor constituted by, for example, a photo interrupter or the like. As described above, the screws 39 and 40 with gears are retracted downward in FIG. A state in which each of them is separated from the ring 12 is detected. Reference numeral 51 denotes a rotary encoder linked to the motor 41, which supplies the amount of rotation of the motor 41 to the CPU 46 as an FG signal. The motor drive amplifier 48 includes an upper drum 10a on which a magnetic head is mounted.
The power is supplied to the drum motor 26 that rotationally drives the drum motor. Then, as is well known, the drum motor 26
A signal is provided to the CPU.

Next, the magnetic tape T is moved to a standard traveling speed of 2
Lead ring 12 when recording while traveling at double speed
The procedure for controlling the inclination angle of the tape guide drum 10 will be described. (Control method of tilt angle 1: FIG. 11) (1) Insert a standard tape. This is performed by inserting a cassette into the apparatus and loading a standard tape on which a correct track pattern is accurately recorded in the cassette into a traveling system. (2) Reset the drum tilt mechanism. This reset is performed, for example, as described above.
0 and the lead ring 12 in the reference posture (drum inclination angle θ0
: See FIG. 10). (3) Set the drum inclination to the automatic setting start position.
Geared screws 39, 40 (driving means 21, 22)
6A is driven upward in FIG.
The tape guide drum 10 and the lead ring 12 are slightly inclined from the reference posture (drum inclination angle θ1: see FIG. 10). (4) Double-speed playback The standard tape is run at twice the standard speed for playback. At this time, as a magnetic head used for reproduction, any one of a set of magnetic heads Ha and Hb or a set of magnetic heads Hc and Hd located at positions 180 degrees apart from each other is used. (5) Envelope integration The reproduced signal that has passed through the low-pass filter is integrated by the integrator 52 over, for example, one field period, and then A / D
The signal is converted into a digital signal by the converter 45 and supplied to the CPU 46. (6) Memory A ← Integral Value The CPU 46 records the integral value converted into a digital signal in the memory A. (7) Drum tilt angle + α Here, the CPU 46 drives the motor 41 to further tilt the tape guide drum 10 and the lead ring 12 by a predetermined minute angle. It should be noted that the integration of the integrated value into the CPU 46 is stopped during the period of the tilt drive. (8) (9) (10) In the same manner as (4), (5), and (6), the integrated value converted into a digital signal is recorded in the memory B. (11) Compare the value of the memory A with the value of the memory B.
If (value of memory A) <(value of memory B) is "true", the value of memory A is updated with the value of memory B, and the process returns to (6).
If “false”, the tilt angle is the optimum angle (drum tilt angle θ
2: see FIG. 10) and proceed to the next step. (12) Memory C ← Drum Tilt Angle The output value of the rotary encoder 51 corresponding to the drum tilt angle when A <B is false is recorded in the memory C. (13) Standard tape eject Stops playback of the standard tape and ejects the cassette.

(Inclination Angle Control Method 2: FIG. 12) In the inclination angle control method 1, the lead ring 12 is formed using a standard tape on which a correct track pattern is accurately recorded.
Although the method for optimizing the inclination angle of the tape guide drum 10 has been described, self-recording and reproduction may be performed using a recording tape as shown in FIG. (1) Insert the recording tape. This is performed by inserting a cassette into the apparatus and loading a so-called blank tape in the cassette into a traveling system. (2) Reset the drum tilt mechanism. This reset is performed, for example, as described above.
0 and the lead ring 12 in the reference posture (drum inclination angle θ0
: See FIG. 10). (2) -1 Rewinding after Standard Speed Recording The magnetic tape is run at a standard speed with the tape guide drum 10 and the lead ring 12 in the reference posture, and normal recording is performed for a predetermined time. Then, rewind to the start position of normal recording. (3) to (12) Same as control method 1 for tilt angle. (13) Eject recording tape Stops playback of the recording tape and ejects the cassette.

In this manner, the optimum inclination angles of the tape guide drum 10 and the lead ring 12 when the magnetic tape runs at twice the standard running speed are recorded in the memory C as output values of the rotary encoder 51. Is done. Therefore, when recording is performed by running the magnetic tape at twice the standard traveling speed, before starting recording,
Based on the values recorded in the memory C, the tape guide drum 10
And after setting the lead ring 12 to the optimal inclination angle,
The magnetic tape may be run at twice the speed. At this time, for example, referring to FIG. 5A, signals to be recorded on the two magnetic heads Hb and Hc sliding on the magnetic tape T are individually supplied. As a result, two adjacent tracks are recorded simultaneously and in parallel. For this reason, in an apparatus requiring azimuth recording, such as a VHS VTR, it is necessary to set the magnetic heads disposed adjacent to each other to have opposite azimuths.

In this example, N = 2 and four magnetic heads Ha, Hb, Hc, Hd have been described. In this configuration, however, when the magnetic heads adjacent to each other are set to have an inverted azimuth, 180 is used. Since magnetic heads located at symmetrical positions have the same azimuth, it is desirable to set N to an odd number of 3 or more in consideration of reproduction of a magnetic tape running at a standard speed. Thereby, the magnetic heads located at the 180-degree symmetric positions can be set to have the opposite azimuths. When azimuth recording is assumed and N is an even number of 2 or more, a magnetic head having an azimuth reverse to that of the arbitrary magnetic head may be provided in the vicinity of the arbitrary magnetic head. As a result, a pair of magnetic heads having opposite azimuths can be arranged at approximately 180-degree symmetric positions, and recording and reproduction of a magnetic tape running at a standard speed can be performed even when N is an even number of 2 or more. It becomes possible. At this time, since the magnetic head having the inverted azimuth cannot be physically arranged at exactly 180 ° symmetrical position, it goes without saying that the mounting height of the magnetic head should be adjusted.

In the case of a recording having a so-called overlap portion in which the winding range of the magnetic tape around the tape guide drum is set to be slightly larger than 180 degrees, when N = 2 exemplified above, three pieces are instantaneously obtained. Since the magnetic head comes into sliding contact with the tape, it goes without saying that in such an apparatus, signals to be recorded on these three magnetic heads must be individually supplied.

According to the magnetic recording / reproducing apparatus described above,
In the track correction, the inclination angle of the tape guide drum 10 with respect to the lead ring 12 (lead L) can be determined,
The rotational trajectory surfaces of the magnetic heads Ha, Hb, Hc, Hd are made to conform well to the track pattern of the magnetic tape T, and the inclination angle of the lead ring 12 (lead L) can be accurately determined in the read correction. Since the edge Tb can be guided stably, good recording becomes possible even when the magnetic tape is run at twice the standard running speed.

However, when N is relatively small (N = 2) as described above, there is almost no problem. However, when N is increased, the recorded magnetic tape is run at a standard running speed and reproduced. In such a case, a change in the time axis (the interval between the horizontal synchronization signals recorded on the magnetic tape becomes narrower) cannot be ignored, which adversely affects the reproduced signal. The change of the time axis is about 0.3% in the case of N = 2 in a general VTR. However, when N becomes large, it becomes several%, and the horizontal synchronization of the monitor may not be locked. .

FIG. 13 shows a method for solving this problem.
This will be described below with reference to FIG. FIG. 13 is a block diagram of a control system for controlling the inclination angle between the lead ring and the tape guide drum, and controlling the rotation speed of the rotary magnetic head and the traveling speed of the magnetic tape. When this block diagram is compared with the block diagram of FIG. 9 referred to earlier, in the block diagram of FIG. 9, the system control CPU 46 has a function of controlling the drum motor 26.
In this block diagram, this function is removed from the system control CPU 46, and the servo control CP
U60 is configured to perform this function. Except for this point, the system control CPU 46 in the block diagram of FIG. 13 basically has the same function as that of FIG. 9, and the related components are assigned the same reference numerals and description thereof is omitted.

In FIG. 13, reference numeral 60 denotes a servo control CPU having a built-in reference clock generator 61 and a horizontal / vertical synchronization signal generator 62. The servo control CPU 60 has a drum motor 26, a capstan motor 6 according to a built-in program.
5. The rotation of the reel motor 67 is servo-controlled by software. Reference numeral 68 denotes a control head.
5 is a capstan motor 65 and a reel motor 7 respectively.
6 is a motor drive amplifier. Further, the system control CPU 46 and the servo control CPU 60
The system control CPU 46 transmits mode information (standard recording mode / N.times. Speed recording mode / reproduction mode, etc.) received from the operator to the servo control CPU 60 as shown in FIG.

When the operator instructs the system control CPU 46 to perform recording at N times speed by operating means (not shown), the system control CPU 46 transmits the information to the servo control CPU 60,
The track correction control and the read correction control are performed, and the tape guide drum 10 and the read ring 12 are inclined at an angle suitable for the N-times speed recording mode. This control is the same as the control described above with reference to the block diagram of FIG. On the other hand, the servo control CPU 60 calculates the correction amount of the rotation speed of the upper drum 10a and the correction amount of the running speed of the magnetic tape T based on the information of the "N-times recording mode" received from the system control CPU 46. And
The corrected rotational speed of the upper drum 10a and the magnetic tape T
, The servo control CPU 60 controls the drum motor 26 and the capstan motor 65.

As described above, the rotational speed of the upper drum 10a and the traveling speed of the magnetic tape T are appropriately corrected in accordance with the traveling speed magnification of the magnetic tape, so that the horizontal synchronizing signal recorded on the magnetic tape is corrected. The interval is corrected to a regular interval, and a recording track in exactly the same form as when recording in the standard recording mode can be realized. In the above description, the configuration in which the servo control CPU calculates each correction amount based on the information of “N × speed recording mode” has been described. However, the present invention is not limited to this. Calculate the amount and store this in ROM
69, and the value may be referred to.

In the above description, the upper drum 10a is a rotating drum, and the rotating upper drum has a magnetic head H
Although the configuration in which a, Hb, Hc, and Hd are mounted has been described, the present invention is not limited to this. For example, the upper drum and the lower drum may be fixed drums, and a rotating member (intermediate drum) may be separately provided between the upper and lower drums, and the magnetic head may be mounted on the rotating member. In this case, as the track correction, the upper and lower drums and the intermediate drum may be integrally inclined with respect to the lead ring.

When high-speed dubbing is performed using the magnetic recording / reproducing apparatus of the present invention, N tracks are reproduced by the magnetic recording / reproducing apparatus of the present invention, and this is performed by using one or more magnetic recording / reproducing apparatuses of the present invention. For recording. However, the supply of the signal to be recorded is not limited to this. Of course, N signals to be recorded on N tracks may be supplied from an arbitrary signal source at a predetermined timing.

[0045]

As described above, according to the magnetic recording / reproducing apparatus of the present invention, for high-speed recording (dubbing at N times speed), the guide portion for regulating the position of the magnetic tape and the rotational trajectory surface of the rotating magnetic head are used. The optimal tilt angle of the magnetic tape can be accurately determined, and the rotation track surface of the magnetic head matches the track pattern of the magnetic tape well, and the accurate track pattern can stably guide the lower edge of the magnetic tape. It is possible to simultaneously record N tracks.

Further, since the rotation speed of the rotary magnetic head and the running speed of the magnetic tape are corrected with the N-times recording, the interval between the horizontal synchronization signals is exactly the same as that in the case of recording in the standard recording mode. It is possible to prevent deterioration of image quality at the time of reproduction.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a main part of a typical tape running system of a VHS system VTR.

FIG. 2 is a front view of FIG.

FIG. 3 is a plan view of FIG. 1 as viewed from a direction of a drum shaft 11;

FIG. 4 is a diagram schematically showing a tape pattern of a VHS system VTR.

FIG. 5 is a diagram schematically showing a principle structure of a magnetic recording / reproducing apparatus of the present invention.

FIG. 6 is a diagram showing a detailed configuration of a drum assembly of the present invention.

FIG. 7 is an exploded perspective view of main parts of the drum assembly of the present invention.

FIG. 8 is a cross-sectional view showing an aspect of a drum assembly during double speed recording according to the present invention.

FIG. 9 is a block diagram of a control system for controlling a read ring and a tape guide drum inclination angle in the present invention.

FIG. 10 is a graph showing a relationship between an envelope integral value and a drum inclination angle at the time of 2 × speed reproduction.

FIG. 11 is a flowchart illustrating a method of controlling the inclination angle of the lead ring and the tape guide drum according to the present invention.

FIG. 12 is a flowchart illustrating a method of controlling the inclination angle of the lead ring and the tape guide drum according to the present invention.

FIG. 13 is a block diagram of a control system that controls the inclination angle between the lead ring and the tape guide drum and controls the rotation speed of the rotary magnetic head and the running speed of the magnetic tape according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Inclined pole 2 Inclined pole 3 Supply reel 4 Erasing head 5 Impedance roller 6 Audio control head 7 Capstan 8 Pinch roller 9 Take-up reel 10 Tape guide drum 11 Drum shaft 12 Lead ring 13 Entrance guide roller 14 Exit guide roller 15 Urging means 16 urging means 17 drum base 20 tape cassette 20 21 driving means 22 driving means 23 urging means 24 bearing 25 bearing 26 drum motor 27 rotating transformer 28 rotating transformer 29 through hole 30 through hole 31 tap hole 32 through hole 33 Through-hole 34 Through-hole 35 Tap hole 36 Coil spring 37 Coil spring 38 Leaf spring 39 Geared screw 40 Geared screw 41 Motor 42 Amplifier 4 Detector 44 Low-pass filter 45 A / D converter 46 System control CPU 47 Motor drive amplifier 48 Motor drive amplifier 49 Gear train 50 Reference position sensor 51 Rotary encoder 52 Integrator 60 Servo control CPU 61 Reference clock generator 62 Horizontal / vertical synchronization Signal generator 63 Software servo 64 Motor drive amplifier 65 Capstan motor 66 Motor drive amplifier 67 Reel motor 68 Control head 69 ROM

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code Agency reference number FI Technical display location G11B 15/61 G11B 15/61 CJZ H04N 5/783 H04N 5/783 Z

Claims (8)

[Claims] A helical scan type magnetic recording / reproducing apparatus for recording / reproducing an inclined track on a magnetic tape running around a part of a peripheral surface of an upper drum and a lower drum by using a rotating magnetic head. , 2N (N ≧ 2) rotating magnetic heads, and the upper and lower drums are configured separately from each other, and are arranged close to the outer peripheral surface of a small-diameter portion formed at the lower portion of the lower drum. A magnetic tape position regulating guide for regulating the position of a reference edge of the magnetic tape; and an upper and lower drum and a rotational trajectory surface of the rotary magnetic head with respect to the magnetic tape position regulating guide. First tilt drive means for integrally tilting; second tilt drive means for tilting the guide portion for regulating the position of the magnetic tape; and the rotation trajectory surface of the rotary magnetic head by the first tilt drive means. Angle of inclination and the second inclination driving hand Angle detection means for detecting the inclination angle of the guide portion for regulating the position of the magnetic tape, and the first inclination drive means and the second inclination drive means for maximizing the reproduction output. First inclination control means; signal supply means for individually supplying signals to be recorded on the N or N + 1 rotating magnetic heads slidingly contacting the magnetic tape; and a standard tape on which accurate inclination tracks are recorded in advance. Is reproduced at a speed N times the standard traveling speed, the tilt of the rotation locus surface of the rotary magnetic head, which is determined by the first tilt control means and detected by the tilt angle detecting means, A memory means for holding the angle and the inclination angle of the guide portion for regulating the position of the magnetic tape; and a memory means for holding the magnetic tape at a speed N times the standard running speed for recording. The rotation A second tilt drive unit for controlling the first tilt drive unit and the second tilt drive unit based on the tilt angle of the rotation locus plane of the magnetic head and the tilt angle of the guide portion for regulating the position of the magnetic tape; A magnetic recording and reproducing apparatus comprising at least tilt control means. 2. A helical scan type magnetic recording / reproducing apparatus for recording / reproducing an inclined track on a magnetic tape running around a part of a peripheral surface of an upper drum and a lower drum by using a rotating magnetic head. , 2N (N ≧ 2) rotating magnetic heads, and the upper and lower drums are configured separately from each other, and are arranged close to the outer peripheral surface of a small-diameter portion formed at the lower portion of the lower drum. A magnetic tape position regulating guide for regulating the position of a reference edge of the magnetic tape; and an upper and lower drum and a rotational trajectory surface of the rotary magnetic head with respect to the magnetic tape position regulating guide. First tilt drive means for integrally tilting; second tilt drive means for tilting the guide portion for regulating the position of the magnetic tape; and the rotation trajectory surface of the rotary magnetic head by the first tilt drive means. Angle of inclination and the second inclination driving hand Angle detection means for detecting the inclination angle of the guide portion for regulating the position of the magnetic tape, and the first inclination drive means and the second inclination drive means for maximizing the reproduction output. First inclination control means; signal supply means for individually supplying signals to be recorded on the N or N + 1 rotating magnetic heads in sliding contact with the magnetic tape; and inclination of the rotation trajectory surface of the rotating magnetic head. The first tilt drive means and the second tilt so that the angle and the tilt angle of the position regulating guide portion of the magnetic tape are set to a predetermined standard angle corresponding to a standard running speed of the magnetic tape. A second inclination control means for controlling the driving means, and a state in which the inclination angle of the rotation locus surface of the rotary magnetic head and the inclination angle of the guide portion for regulating the position of the magnetic tape are set to the standard angle. Run the magnetic tape at the standard running speed Recording means for causing the magnetic tape recorded by the recording means to travel at a speed N times the standard traveling speed and reproducing the magnetic tape, and the recording means being determined by the first tilt control means Memory means for holding the inclination angle of the rotation trajectory surface of the rotary magnetic head and the inclination angle of the guide portion for regulating the position of the magnetic tape detected by the inclination angle detection means; When recording while traveling at a speed N times the standard traveling speed, the inclination angle of the rotation trajectory surface of the rotating magnetic head held in the memory means and the inclination of the guide portion for regulating the position of the magnetic tape. A magnetic recording / reproducing apparatus comprising at least a third tilt control means for controlling the first tilt drive means and the second tilt drive means based on an angle. 3. The magnetic recording / reproducing apparatus according to claim 1, wherein the upper drum is a rotary drum, and the rotary magnetic head is mounted on the rotary drum. 4. The magnetic device according to claim 1, wherein an intermediate drum that rotates between the upper drum and the lower drum is provided, and the rotary magnetic head is mounted on the intermediate drum. Recording and playback device. 5. The magnetic recording / reproducing apparatus according to claim 1, wherein N is an odd number of 3 or more. 6. A rotating magnetic head having an azimuth opposite to that of an arbitrary rotating magnetic head when N is an even number of 2 or more. The magnetic recording / reproducing apparatus according to claim 4. 7. When the magnetic tape is run and recorded at a speed N times the standard running speed, the interval between horizontal synchronizing signals recorded on the magnetic tape is set to a predetermined value. Calculating means for calculating the number of revolutions of the rotating magnetic head and the traveling speed of the magnetic tape; and recording and recording the magnetic tape while traveling at a speed N times the standard traveling speed. A speed control means for controlling the running speed of the magnetic tape so as to match the rotation speed of the rotary magnetic head calculated by the calculating means and the running speed of the magnetic tape is provided. The magnetic recording / reproducing apparatus according to claim 1. 8. When the magnetic tape is run at a speed N times the standard running speed and recorded, the interval between horizontal synchronization signals recorded on the magnetic tape is set to a predetermined value. A second memory means for storing a rotational speed of the rotary magnetic head and a running speed of the magnetic tape calculated in advance; and when the magnetic tape is run and recorded at a speed N times a standard running speed, Speed control means for controlling the number of rotations of the rotary head and the running speed of the magnetic tape to match the number of rotations of the rotating magnetic head and the running speed of the magnetic tape stored in the second memory means 7. The magnetic recording / reproducing apparatus according to claim 1, further comprising: