JPH06150273A - Helical scan type reciprocating recording and reproducing device - Google Patents

Abstract

PURPOSE:To provide a helical scan type reciprocating recording and reproducing device which does not require the reinsertion of a tape cassette at the time of switching the recording or reproduction direction from the forward or reverse direction to the reverse or forward direction. CONSTITUTION:A rotary cylinder unit 3 is constituted of fixed cylinders 30 and 31 and a rotary cylinder 32 provided with a recording and reproducing head 33. When the recording or reproducing direction of the unit 3 is switched from the forward or reverse direction to the reverse or forward direction, the unit 3 is rotated by operating a rack 35. When the rack 35 is operated, the unit 3 can be also moved in the axial direction, because the unit 3 is rotated along the lead groove 34b of a cylinder holder 34. Due to the rotation and movement of the unit 3, the recording or reproducing track area is changed on a tape and recording or reproduction can be performed in both directions.

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 reciprocating recording / reproducing apparatus, and more particularly to a structure of a helical scan type recording and / or reproducing apparatus using a tape-shaped recording medium.

[0002]

2. Description of the Related Art Conventionally, a helical scan type recording / reproducing apparatus using a rotary cylinder head has been applied to a VTR or a DAT. Hereinafter, it is described as R / P). In response to such a recording / reproducing apparatus, a helical scan type recording / reproducing apparatus capable of reciprocating R / P on a tape has been proposed in recent years, and is partially commercialized. In this recording / playback device,
Since non-tracking reproduction processing is possible, high mechanical accuracy is not required for the R / P mechanism section. Therefore, the tape feeding mechanism can be downsized and the tape cassette can be made extremely small. Moreover, since reciprocal recording is possible, the recording time can be sufficiently long.

FIG. 37 shows a conventional non-tracking (hereinafter referred to as NT system) recording / reproducing apparatus, which is disclosed in Japanese Patent Laid-Open No. 178066/1993.
It is a perspective view of a mechanism part. In this device, a rotary cylinder unit (hereinafter referred to as a rotary cylinder U) 152, a guide pin 157 for tape guide, and a capstan 158 for feeding the tape 50 at a constant speed are provided on a sub chassis 151. 37, and the tape cassette 41 is loaded at the time of R / P as shown in FIG.

The tape cassette 41 is provided with a supply reel (hereinafter referred to as S reel) 42, a take-up reel (hereinafter referred to as T reel) 43, and pinch rollers 44 and 45. These members can be rotationally driven by the drive unit of the recording / reproducing apparatus in the loaded state. Further, when the tape cassette 41 is loaded, the cylinder portion including the recording / reproducing head of the rotary cylinder U152, that is, the rotary cylinder 155 having the fixed cylinders 153 and 154 and the head 156 is tensioned to the front surface portion inside the cassette 41. The tape 50 is inserted into the cassette while pressing the tape 50, and as shown in FIG. 38, which is a view taken in the direction of arrow C in FIG.
Only the tape 50 comes into contact with the tape 50. However, the rotating shaft of the rotating cylinder 155 is inclined by a predetermined inclination angle with respect to the running direction of the tape 50 in order to give a still angle of recording tracks 50a and 50b described later.

In this apparatus, the tape cassette 41 has an A side / B side (see FIG. 39), and the R /
Even in the P process, the feeding direction of the tape 50 is always the forward (hereinafter, referred to as FW) direction as shown in FIG. 37, that is,
It is fed from the S reel 42 side to the T reel 43 side. The rotation direction of the rotary cylinder 155 is also always clockwise (in FIGS. 37 and 38). When the tape is loaded on the cassette holder 161 of the apparatus main body 160 with the A side facing up (see FIG. 39), the tape is recorded on the A side track 50a in the upper half of the tape 50 (FIG. 4).
0 (see (A)). In addition, by reversing the cassette 41,
Tape 50 when loaded face up (see FIG. 39)
Is recorded on the B side track 50b on the side opposite to the tape center 50c on the A side track 50a side of the tape 50.
Is recorded in the field (see (B) of FIG. 40). The pitch of each track is about 9.8 μm. The track has a still angle of about 4.4 °. And
Similarly, when the reproduction is performed, the A-side or B-side tracks 50a or 5 depending on the loading direction of the cassette 41.
The recorded data of 0b is reproduced.

[0006]

However, in the conventional helical scan type recording / reproducing apparatus capable of reciprocating recording / reproducing on a tape, recording or reproducing is performed on the A side track as shown in FIG. When switching from the 50a to the B side track 50b, it was necessary to take out the cassette 41, turn it upside down, and load it again. This operation is not only troublesome, but there is a problem in that when continuous recording is performed, unrecordable time occurs. Also, the operator must always check the tape running position, but if he does not notice that the running on one side has ended, a long recording time will be lost. Furthermore, the same problem occurred during reproduction.

The present invention has been made in order to solve the above-mentioned problems, and it is an outward track and a reverse track (hereinafter, RE) in the FW running direction of a tape of a recording medium capable of reciprocal recording.
(Recorded V) When performing recording or reproduction on a return track in the traveling direction, it is possible to easily or automatically perform recording on the return track and the return track without the need to take out the recording medium. It is an object of the present invention to provide a helical scan type reciprocal recording / reproducing apparatus capable of recording or reproducing.

[0008]

A helical scan type reciprocal recording / reproducing apparatus according to the present invention rotates a recording / reproducing rotary cylinder and a predetermined recording / reproducing surface on a tape in correspondence with the running direction of the tape. And means for moving the cylinder relative to each other.

[0009]

When recording or reproducing in accordance with the running direction, the rotary cylinder is moved relative to the tape to change the recording or reproducing head recording or reproducing track area.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a main block configuration diagram of a helical scan type reciprocal recording / reproducing apparatus showing an embodiment of the present invention.
This device is a device for performing reciprocal recording / reproduction of a helical scan system to which the NT format is applied, and a tape 50 which is a recording medium in which a rotary cylinder U3 mounted at an inclination is a recording medium.
It is possible to rotate and move in the axial direction relative to (see FIG. 10).
), Recording or reproducing operation on the A side track 50a and the B side track 50b of the magnetic tape 50 without changing the loading direction of the tape cassette, that is, R /
It is a device capable of performing the P operation (see FIG. 5).

The apparatus of this embodiment comprises a system controller 1 for controlling each control element, two R / P magnetic heads 33 mounted opposite to each other, and a rotary cylinder U3 having a cylinder motor 4 built-in. The driver 2 of the motor 4, the magnetic head switching circuit 5 for switching the magnetic head 33 that operates during R / P, the R / P amplifier 8 for amplifying the output of the magnetic head 33, and the signal output from the amplifier. A processing circuit 9, a capstan motor 11 for tape running, a driver 10 for the motor, a tape end detecting circuit including photo reflectors 14 and 15 for detecting the end of the running tape, and a rotating cylinder U3. Rotating cylinder U including a solenoid 12 for biasing and a position switch 13 for detecting the rotational position of the rotating cylinder U3. And rotating mechanism mainly constituted by an operation unit 16 composed of operation switches such as R / P operation specified.

2, 3 and 4 are a front view, a side view and a plan view of a mechanism portion including a rotary cylinder U3 of the recording / reproducing apparatus. As shown in these figures, the rotary cylinder U3 is held by a cylinder holder 34 fixed on the main chassis 21 with its axis inclined with respect to the running direction of the tape 50. On the sub-chassis 21, capstans 28 and 29 for running the tape 50 at a constant speed are provided on both sides of the rotary cylinder U3.

At the time of R / P, the tape cassette 41
3 is loaded as shown in FIG. 3 or FIG. 4, and only a predetermined wrap angle (about 100 °) of the magnetic tape 50 is brought into contact with the R / P head surface of the rotary cylinder U3, and the R / P is enabled. . The tape cassette 41 is provided with an S reel 42, a T reel 43, and pinch rollers 44 and 45 as in the conventional case, and these members are recorded / loaded in a loaded state. It is rotationally driven by the drive unit of the reproducing apparatus. That is, the capstans 28 and 29 are
Pulley 22b driven by capstan motor 11, tension pulley 27, capstan pulleys 28a, 29
It can be driven counterclockwise and clockwise through the belt 46 wound around a.

Any one of the S reel 42 and the T reel 43 is selected via the gear 22a driven by the capstan motor 11, the gear trains 23, 24, 25, and the swing gear 26. It is driven by the S reel gear 42a or the T reel gear 43a which is brought into mesh with each other. When the S reel 42 and the T reel 43 are also driven, they are driven clockwise and counterclockwise.

FIG. 5 shows a magnetic tape 50 of the apparatus of this embodiment.
Is a diagram showing the relationship between the traveling direction of the tape and the recording track pattern. When recording or reproducing on the A side track 50a, that is, in the case of R / P operation in the FW direction, the tape is F
It travels in the W (forward) direction, that is, in the winding direction from the S reel 42 through the capstan 28, the pinch roller 45 and the T reel 43. On the other hand, when recording on the B-side track 50b, that is, in the case of R / P operation in the REV direction,
The tape is in the REV (reverse) direction, that is, the T reel 43.
Then, it travels in the winding direction by the S reel 42 via the capstan 29 and the pinch roller 44. When the tape runs in the FW direction, the capstan 29 is pressed and urged toward the pinch roller 45, the capstan 28 is separated from the pinch roller 44, and the tape 50 runs at a constant speed. Further, when the tape is running in the REV direction, the capstan 28 is pressed and urged toward the pinch roller 44 side, the capstan 29 is separated from the pinch roller 45, and the tape 5 is moved.
It runs at zero speed.

6 and 7 show the rotating cylinder U3 and the magnetic tape 50 during the R / P operation in the FW direction or the REV direction.
It is a figure which shows the positional relationship of. In the figure, the angle θa is the wrap angle of the tape, and the developed length thereof substantially corresponds to the length of each R / P track 50a, 50b. The magnetic tape 50 has its upper edge 50a and lower edge 50b guided by tape guides 30a and 31a provided on fixed cylinders 30 and 31 of a rotary cylinder U3, which will be described later.
The vehicle travels in the W direction or the REV direction. The guides 30a and 31a have a predetermined lead angle as in the conventional recording / reproducing apparatus. In the present apparatus, the R / P operation is performed by the two magnetic heads 33 arranged on the same circumference of the rotary cylinder so as to face the tracks 50a and 50b.

In a conventional device which does not perform reciprocal R / P such as a VTR, the tape is pulled out from the tape cassette to give a larger wrap angle, but the helical scan system reciprocal recording / reproducing device as in this embodiment is used. Then, for the purpose of miniaturization, without a mechanism to pull out the tape,
The wrapping angle θa of the tape is a relatively narrow wrap angle (10
It is set to 0 °). Therefore, it is impossible to change the R / P position from the track 50a to the track 50b by electrically controlling the read angle of the magnetic head. Therefore, the magnetic head 33
The tape guides 30a and 31 for guiding the tape width edge are used to switch between the tracks 50a and 50b for performing the / P operation.
It is necessary to shift the position of the magnetic head 33 vertically with respect to a.

As shown in FIG. 10, the rotary cylinder U3 of the present apparatus has fixed cylinders 30 and 31 vertically arranged with a rotatable rotary cylinder 32 having a magnetic head 33 in the central portion therebetween. The fixed cylinders 30 and 31 have the above-mentioned tape guides 30a and 31a corresponding to the tape width (2.5 mm) for spacing the tape in the effective lead portion shown in FIGS. 13 (A) and 13 (B). Is provided.
The effective read portion is set to be sufficiently longer than the angle (2 × θa + θb). The angles θa and θb will be described later.

Since the rotary cylinder U3 is configured as described above, the magnetic head 33 is connected to the tracks 50a, 50.
In order to shift the R / P position up and down corresponding to b, the fixed cylinders 30, 31 and hence the rotary cylinder U3 can be rotated by a predetermined angle and at the same time moved by a predetermined distance in the axial direction. Will be needed.

FIG. 8 is a diagram showing the rotation and axial movement of the rotary cylinder U3. When the rotary cylinder U3 is in the 3A state corresponding to the R / P of the track 50a, the R / P of the track 50b is shown. P is in the corresponding 3B state. Then, in FIG. 8, point A on the cylinder circumference
1 and A2 indicate the R / P end point and the start point of the track 50a in the FW direction. The points A3 and A4 on the cylinder circumference are
The start and end points of the REV direction R / P of the track 50b are shown. As shown in the enlarged view of the recording tracks 50a and 50b in FIG. 9, the distance between points A2 and A3 corresponds to a separation band (green belt) G between the tracks. The cylinder angle between the points A1 and A2 or between the points A3 and A4 is set to the angle θa which is approximately equal to the tape winding angle. Point A
Between 2 and A3, as shown in FIG. 9, the separation zone (green belt) G between both tracks corresponds, and the cylinder angle is indicated by an angle θb.

Now, when the rotary cylinder U3 is in the 3A state, when the rotary cylinder U3 is rotated by an angle obtained by adding the angles θa and θb, the positions of the guides 30a and 31a with respect to the tape 50 are the positions 30aa and 30a shown in FIG. Move to 31aa.
Therefore, the positions of the guides 30a and 31a and the position 30a
The rotary cylinder U3 is moved by the axial movement amount H1 corresponding to the deviation between a and 31aa. The movement position is shown at the position 3B of the rotary cylinder U3 in FIG. That is, the upper end point B1 of the rotary cylinder U3 in the 3A state descends to the upper end point B2 of the rotary cylinder U3 in the 3B state. Magnetic head 33
Also falls by the same amount, and the R / P operation in the REV direction for the track 50b becomes possible. In addition, R in the REV direction
During the / P operation, the tape runs in the REV direction, but the rotating cylinder U3 also rotates counterclockwise in accordance with the tape direction. The rotation and movement of the rotary cylinder U3 is
A cylinder holder 3 described later that supports the rotary cylinder U3.
The cylinder pin 3 along the lead groove 34b arranged in
This is done by sliding 1b.

Next, the relationship between the predetermined rotation angle and the vertical movement distance of the rotary cylinder U3, the track length, and the still angle will be described. FIG. 9 shows an enlarged view of the recording track pattern of the tape 50. In the figure, the angle α indicates the inclination angle (still angle) of the tracks 50a and 50b, and the dimension H
1 gives a space along the inclination of the track 50a and the track 50b below the track. The dimension La gives the length of the tracks 50a and 50b. As for the dimension G, when the width of the separation belt (green belt) is given between both tracks and the distance from the tape center 50c is Lb,
The length of the separation band width G along the still angle is given by 2 × Lb.

When the radius of the rotary cylinder U3 is r, the relationship between the track length La and the winding angle θa is La = r × θa ……………………………… (1) Becomes Further, since the cylinder angle corresponding to the traveling direction in the length 2 × Lb corresponding to the separation band width G corresponds to the cylinder angle θb corresponding to the separation band width G in FIG. 8, the following equation, 2 × Lb = r × θb. …………………………………… (2) is established. On the other hand, the track interval H1 is 1/2 of the length corresponding to the still angle α, the track length La, and the separation band width G.
Can be obtained by the dimension Lb. That is, H1 = (La + Lb) × sin (α) + Lb × sin (α) (3) The rotation angle (θa + θb) of the rotary cylinder U3 for switching the R / P track in FIG. 8 is obtained from the above equations (1) and (2), and the axial movement amount is given by the equation (3). Will be given by the spacing H1. .

FIG. 10 is an exploded perspective view of the rotary cylinder U and its supporting mechanism in the recording / reproducing apparatus of this embodiment, FIG. 11 is a plan view of the mechanical section, and FIG. 12 is a vertical sectional view. . The rotating cylinder U3 shown in FIG. 10 and the like has a fixed cylinder 30 having the tape guides 30a and 30b as described above, and a rotating cylinder having the pair of R / P heads 33 sandwiched between the fixed cylinders 31 and 31. Cylinder 32, fixed cylinder 30 and fixed cylinder 30
A fixed cylinder 3 that rotates and moves integrally with the fixed cylinder 3 and has moving drive pins 31b arranged in three directions.
1 and a pinion 32a for rotationally driving the fixed cylinders 30 and 31.

The cylinder holder 34, which supports the rotary cylinder U3, is fixed to the chassis 21 by screws and mounted. Then, along the circumference, the drive pin 3
It has three lead grooves 34b into which 1b can be fitted.
Further, a pin 34c is fixed to the bottom portion thereof, and the pin 34c supports a rack 35 that meshes with the pinion 32a so as to be able to slide straight. The rack 35 has a tension spring 36, the other end of which is suspended from the chassis 21, as shown in FIG.
It is biased to the right of 2. Further, a drive pin 35b is planted in the rack 35, and the solenoid 12
Is engaged with the plunger 12a. The solenoid 12 is of a push type and has a structure in which the plunger 12a projects when energized.

The shape of the lead groove 34b provided in the cylinder holder 34 is such that the axial movement amount H1 with respect to the rotation angle (θa + θb) is given as shown in the development view of FIG. 13C. Lead shape. Figure 14
FIG. 15A is a vertical cross-sectional view showing an operating state of the rotary cylinder U3 and the cylinder holder 34, and FIG. 14A shows a mounted state. The state of FIG. 14B is a vertical cross-sectional view in a state where the solenoid 12 is turned off and the fixed cylinders 30 and 31 are rotated counterclockwise. In this state, the fixed cylinders 30 and 31 are lifted by the drive pin 31b, and the rotary cylinder U3 is positioned in the state 3A in FIG. The magnetic head 33 is located at a position where it can scan the track 50a and perform the R / P operation in the FW direction.

The state shown in FIG. 14C is a longitudinal sectional view in which the solenoid 12 is turned on and the fixed cylinders 30 and 31 are rotated clockwise by a rotation angle (θa + θb). . In this state, the drive pin 31
b and the lead groove 34b, the fixed cylinders 30, 31
Is lowered by the moving amount H1 and the rotary cylinder U3 is positioned in the 3B state of FIG. Therefore, the magnetic head 33 is in a position where it can scan the lower track 50b and perform the R / P operation in the REV direction. In addition,
In FIG. 14, the width H0 of the tape guides 30a and 31a arranged on the fixed cylinders 30 and 31 corresponds to the width of the magnetic tape 50.

Recording of the present embodiment configured as described above
The R / P operation of the reproducing apparatus will be described. When performing the R / P, the tape cassette 41 is loaded. At this time, either side A or B may be turned up. One of the R / P operations by the switch of the operation unit 16, the R / P of the A side,
That is, R / P in the FW direction or R / P in the B surface, that is, RE
R / P in the V direction is designated. And R in the FW direction
When / P is selected, the solenoid 12 is turned off and the rotary cylinder U3 is brought into the state of 3A shown in FIG.
In this state, as described above, the A-side track 50a is R /
P is possible.

Further, in the operation section 16, the R / P of the B side,
That is, when the R / P operation in the REV direction is designated, or when the tape 50 is wound up on the T reel 43 side, the system controller 1 gives an instruction based on the output of the tape end detection circuit. The solenoid 12 is turned on. Then, the rotary cylinder U3 is rotated clockwise by an angle (θa + θb), and is lowered axially by a movement amount H1, resulting in a state 3B shown in FIG. Therefore,
When the R / P operation is started, the cylinder motor 4 is rotated counterclockwise via the motor driver 2, and
Capstan motor 11 via motor driver 10
Is rotationally driven in the REV direction, that is, in the direction in which the tape 50 is wound around the S reel 42. By this operation, the R / P operation to the B side track 50b of the tape 50 is executed.

As described above, according to the helical scan type reciprocal recording / reproducing apparatus of this embodiment, the R in the FW direction is
The / P operation and the R / P operation in the REV direction can be switched by rotating the rotary cylinder U3 by a predetermined angle and moving it in the axial direction, which eliminates the need to replace the tape cassette 41 as in the conventional device. Further, the apparatus of the present embodiment can share the R / P tape with other conventional helical scan type reciprocating recording / reproducing apparatus.

In the above embodiment, when the direction of R / P is switched, it is necessary to rotate the rotary cylinder U3 by a predetermined angle and move it in the axial direction. If the tape is configured to move up and down by the guide pin, the R / P direction can be switched only by moving the rotary cylinder U3 in the axial direction, and a simple device configuration can be proposed. Further, in the case of the present embodiment, the rotation direction of the rotary cylinder is reversed at the time of the R / P operation in the REV direction, but it is not always necessary to reverse the rotation unless the common use of the tape with the conventional device is considered.

Next, although not directly related to the embodiment of the present invention, as one of the helical scan type reciprocal recording / reproducing apparatus, R / P for the A side track 50a and R / P for the B side track 50b are performed. A dedicated R / P head for P is incorporated in the rotary cylinder, and the tape cassette 4 is used in the same manner as in the above embodiment.
A recording / reproducing apparatus capable of performing R / P operations on A-side and B-side tracks without inverting and loading 1 will be described.

FIGS. 15 and 16 are perspective views of a rotary cylinder U for a recording / reproducing apparatus to which the dedicated R / P head is applied. In this apparatus, the rotary cylinder U60 has upper and lower fixed cylinders 61 and 62 in which the tape guides 61a and 62a are arranged and a rotary cylinder 63 arranged in the central portion. Two heads 64 for the A-side track 50aR / P, that is, the FW direction R / P, and two heads 65 for the B-side track 50bR / P, that is, the REV direction R / P are provided on the rotary cylinder 63. Each of them is fixed at a predetermined interval. Further, similarly to the first embodiment, the rotary cylinder U60 is arranged so as to be inclined with respect to the tape running direction. Capstans 28 and 29 are arranged on both sides of the rotary cylinder U60. Further, pinch rollers 44 and 45 are arranged in the tape cassette 41 as in the case of the above embodiment.

The heads 64 and 65 are arranged at 180 ° intervals as shown in FIG.
Are also arranged at 180 ° intervals. And the head 64
The head 65 and the head 65 are arranged with their mounting phases deviated by 90 °. As shown in the side view of FIG. 18A, the reason for arranging them in such a shifted state is that the head in which the running tape 50 does not perform R / P when the phases are not shifted. Since it is pushed outward by, the adhesion of the head to the tape 50 deteriorates. Therefore, as shown in FIG. 18B, if the mounting phases of the heads 64 and 65 are shifted, the adhesion of the tape 50 to the head surface is improved.

In the present recording / reproducing apparatus configured as described above, when the R / P operation in the FW direction and the R / P operation in the REV direction are switched, the rotary cylinder U60 is the same as that of the above embodiment. There is no need to perform any pivoting and axial movement. Then, the above switching can be performed only by changing the running direction of the tape 50 and reversing the rotating direction of the rotary cylinder 63. Therefore, the mechanical structure around the rotary cylinder U60 is simplified, and at the same time, the operation itself can perform stable R / P operation.

FIG. 19 is a perspective view of a rotary cylinder U66 which is a modification of the rotary cylinder U60 shown in FIGS. 15 and 16 described above and which does not require an upper fixed cylinder. As shown in the figure, the rotary cylinder U66 is composed of an upper rotary cylinder 68 having heads 69 and 70 and a lower fixed cylinder 67 having a tape guide 67a.

FIG. 20 shows another modification of the rotary cylinder U60 shown in FIGS.
The central rotating cylinder is a fixed cylinder.
That is, in the rotary cylinder U71, the fixed cylinders 72 and 73 are arranged above and below, and the fixed cylinder 74 is also arranged in the central portion. The rotary cylinders 75 and 77 having the head 76 or 78 are arranged between the fixed cylinders.

Further, in FIG. 21, both heads for R / P in the FW direction and heads for R / P in the REV direction are unitized and mounted on the rotary cylinder U60 shown in FIGS. It is a perspective view of the rotating cylinder U which was made to do. In this rotary cylinder U80, upper and lower fixed cylinders 81 and 82 having a tape guide 81a or 82a are arranged with the rotary cylinder 83 being sandwiched. As shown in the perspective view of FIG. 22, the rotary cylinder 83 has an FW direction R / P head 84a and a REV direction R.
The / P head 84b is held in a state of being fitted into the recess 84c of the head base 84. As shown in the plan view of FIG. 23, the head bases 84 having the heads 84a and 84b are arranged at 180 ° intervals. FIG. 21 above
Since both heads of the rotary cylinder U83 shown in (1) are unitized, assembly, wiring, etc. are easy.

The rotary cylinder U shown in the perspective view of FIG.
21 is a modification of the rotary cylinder U of FIG. 21,
The fixed cylinder arranged above is unnecessary. That is, in the rotary cylinder U85, the rotary cylinder 87 is provided as the upper cylinder, and the fixed cylinder 86 having the tape guide 86a is provided as the lower cylinder. In the rotary cylinder 87, a pair of head bases 88 in which an FW direction R / P head 88a and a REV direction R / P head 88b similar to those shown in FIG.

Next, recording / recording of the embodiment shown in FIG.
The tape running stabilizing mechanism required for improving the function of the R / P operation in the reproducing apparatus will be described. The helical scan system reciprocating recording / reproducing apparatus adopts the medium drum system, and the tape is mounted on the rotary cylinder U at 90.
Since the tape is wound more than 0 °, the head touch force on the tape running entrance side of the cylinder becomes weaker than that on the exit side, and the tape center 50c on the track 50a or the track 50b.
There is a possibility that the head touch at a position closer to, ie, the recording start point is bad, and the spacing loss becomes high. Therefore, it is necessary to dispose a tensioning mechanism portion on the tape traveling entering side as the tape traveling stabilizing mechanism so as to apply tension to the central portion of the tape on the cylinder entering side.

FIG. 25 is a plan view of a helical scan type reciprocal recording / reproducing apparatus incorporating the tensioning mechanism portion which is the tape running stabilizing mechanism. In this figure, the same components as those of the apparatus of the above embodiment are designated by the same reference numerals. Further, as shown in FIG. 25, the magnetic tape 50
Is a tape path portion 50 formed by the wing guides 93 and 95, the rotary cylinder U3, and the self-aligning guides 91 and 92 between the capstan and the pinch roller.
It shall pass through d.

A tensioning mechanism portion 94, which constitutes a tape traveling stabilizing mechanism, is disposed between the wing guides 93 and 95 and the self-aligning guides 91 and 92. As shown in the perspective view of FIG. 26, the tensioning mechanism portion 94 is composed of a support plate 94b fixed near the wing guide 93 or 95 and a felt 94a capable of contacting the tape. In the present apparatus configured as described above, during the R / P operation, the central portion on the tape traveling approach side is pressed by the felt 94a to give tension. Then, it is possible to maintain an appropriate head touch state from the R / P start point to the end point of the track.

FIG. 27 is a perspective view of a modified example of the above-mentioned lining mechanism section. The tensioning mechanism portion of FIG. 27A is composed of a support plate 98b fixed near the wing guide 97 and a felt 98a capable of abutting on the tape. The support plate 98b is composed of an L-shaped spring member having elasticity in the pressing direction, and is fixed above. Therefore, the pressing force of the felt 98a becomes more stable, and the head touch becomes good.
Further, the support plate 98b can be easily fixed.

FIG. 27B is a perspective view of another modified example of the above-mentioned lining mechanism part. The mechanical part of this modified example is a supporting plate 100 fixed near the wing guide 99.
b and a felt 100a capable of contacting the tape. Also in this modification, the support plate 100b is also made of a spring member having elasticity in the pressing direction. The spring member is U-shaped and has a longer effective length and a lower elastic coefficient. is there. Therefore, the variation in the pressing force of the felt 98a is further reduced, and the head touch is good and stable.

28 and 29 also show perspective views of respective modifications of the above-mentioned tensioning mechanism portion. These lining mechanisms do not provide the felt member, but a protrusion is integrally provided at the center of the wing guide, and the protrusion presses the center of the running tape on the entrance side. Tension is applied to the tape entry side.

In the tensioning mechanism portion shown in FIG. 28A, the wing guide 101 has a concentric cylindrical projection 101 at the center thereof.
28A is provided, and the one shown in FIG.
A concentric spherical projection 102 is provided at the center of the wing guide 102.
a is provided. Further, the lining mechanism portion shown in FIG. 29 (A) is one in which an eccentric columnar projection 103a is provided in the central portion of the wing guide 103, and the one shown in FIG. 29 (B) is the wing guide 104. A half-moon-shaped projection 104a is provided in the central portion of the.

FIG. 30 is a plan view of the lining mechanism portion 94 shown in FIG. 26 applied to the conventional recording / reproducing apparatus shown in FIG. Similarly, in the conventional recording / reproducing apparatus, the tape running stabilizing mechanism is required to improve the head touch. Therefore, the lining mechanism portion 94 shown in FIG. 26 is arranged near the wing guide 110 on the tape entry side.

In the helical scan type reciprocal recording / reproducing apparatus of the embodiment shown in FIG. 2, the R / R shown in FIG.
Although the pitch of the P tracks 50a and 50b is 9.8 μm and R / P is performed without tracking, a predetermined accuracy is required for the position of the tracks from the tape width edge. Further, the same thing is required from the viewpoint of compatibility of the tape with the conventional helical scan type reciprocating recording / reproducing apparatus. In order to satisfy the requirement, when the tape is run, the tape width edge is set to the rotary cylinder U shown in FIG.
It is necessary to provide a tape traveling contact control mechanism for traveling in a state of contacting the tape guide 30a or 31a provided on the fixed cylinder 30 or 31 of FIG.

As the tape traveling contact control mechanism, A
When performing R / P on the side track 50a, that is, when running the tape in the FW direction, when the tape 50 is brought into contact with the tape guide 31a of the lower lead and when performing R / P on the B side track 50b, that is, , REV direction, the tape 50 is brought into contact with the tape guide 30a of the upper lead. In order to bring the tape into contact with the tape guide, the tape running contact control action is performed by making the pinch roller or capstan material, outer shape, or the like asymmetric with respect to the axial direction. Can propose.

31 to 33 are perspective views of the pinch rollers having the tape running contact control function according to the respective embodiments, and the pinch rollers 127 and 128 in FIG. 31 are the pinch rollers 127 on the T reel side. The upper half portion 127a is made of a hard material and the lower half portion 127b is made of a soft rubber material. In addition, the upper half portion 128a of the pinch roller 128 on the S reel side is soft,
The lower half portion 128b is made of a hard rubber material.

The pinch rollers 129 and 130 shown in FIG.
The pinch roller 129 on the T reel side has a larger diameter at the lower part, and the pinch roller 130 on the S reel side has a larger diameter at the upper part. The pinch rollers 131 and 132 shown in FIG. 33 are formed by forming convex leads on the outer shape. Then, the pinch roller 131 on the T reel side
Has a right lead 131a, and the pinch roller 132 on the S reel side has a left lead 132a.

In the recording / reproducing apparatus to which each of the pinch rollers shown in FIGS.
When the tape 50 is run in the same direction, the tape 50 is urged downward by the T-reel side pinch rollers at the time of running, and runs while contacting the tape guide 31a below the rotary cylinder U3 in FIG. 10, for example. To do. Also,
When running the tape 50 in the REV direction, the tape 5
0 is biased upward by each pinch roller on the S reel side, and the tape guide 3 above the rotary cylinder U3 in FIG.
It comes into contact with 0a and travels.

As a mechanism for bringing the tape into contact with the tape guide, a mechanism having a capstan shape or the like can be proposed. 34 to 36 are perspective views of each capstan having a tape running contact control function.

FIG. 34 shows changes in the surface roughness of the upper and lower parts of the capstan. That is, in the T reel side capstan 141, the surface 141a of the upper half portion is fine and the surface 141b of the lower half portion is coarse. Also, S
The reel side capstan 142 has an upper half surface 142a.
Is rough, and the roughness of the lower half surface 142b is fine.

FIG. 35 shows a capstan having a tapered shape. That is, the T reel side capstan 143
Indicates that the lower part has a larger diameter, and the S-reel side capstan 144 has a larger part on the upper side. Figure 3
6 is a capstan provided with a lead groove. That is, the T-reel side capstan 145 has the right lead groove 14
5a, the S reel side capstan 146 is
It has a left lead groove 146a.

When the capstans shown in FIGS. 34 to 36 are applied, when the tape 50 is run in the FW direction as described above, the tape 50 is urged downward by each capstan on the T reel side. Further, when the tape 50 is run in the REV direction, the tape 50 is urged upward by each capstan on the S reel side, and more accurate recording or reproduction in the track area 50a or 50b is performed. Done.

[0057]

As described above, in the helical scan type reciprocal recording / reproducing apparatus of the present invention, the rotary cylinder is moved relative to the tape in relation to the recording or reproducing operation on the forward track and the backward track, The recording or the reproduction can be performed, and it has a remarkable effect that the replacement operation of the tape cassette is unnecessary unlike the conventional apparatus.

[Brief description of drawings]

FIG. 1 is a main block configuration diagram of a helical scan type reciprocal recording / reproducing apparatus according to an embodiment of the present invention.

2 is a front view of a recording / reproducing mechanism portion of the helical scan type reciprocal recording / reproducing apparatus of FIG.

3 is a side view of a recording / reproducing mechanism portion of the helical scan type reciprocal recording / reproducing apparatus of FIG.

4 is a plan view of a recording / reproducing mechanism portion of the helical scan type reciprocal recording / reproducing apparatus shown in FIG.

5 is a diagram showing a recording track area of a magnetic recording tape applied to the helical scan type reciprocal recording / reproducing apparatus of FIG. 1;

6 is a diagram showing the relationship between a tape recording track and a rotating cylinder U during R / P operation in the FW direction of the helical scan type reciprocal recording / reproducing apparatus of FIG. 1;

7 is a diagram showing a relationship between a tape recording track and a rotating cylinder U during R / P operation in the REV direction of the helical scan type reciprocal recording / reproducing apparatus of FIG.

8 is a diagram showing the relative positional relationship between the rotary cylinder U and the tape corresponding to the FW / REV direction R / P operation of the helical scan type reciprocal recording / reproducing apparatus of FIG. 1;

9 is an enlarged view of recording tracks of a magnetic recording tape applied to the helical scan type reciprocal recording / reproducing apparatus of FIG.

10 is a helical scan type reciprocal recording of FIG.
FIG. 3 is an exploded perspective view of a rotary cylinder U and a cylinder holder incorporated in the playback device.

11 is a helical scan type reciprocal recording of FIG.
FIG. 3 is a plan view of a rotary cylinder U and a cylinder holder incorporated in the playback device.

FIG. 12 is a helical scan type reciprocal recording of FIG.
FIG. 3 is a vertical cross-sectional view of a rotary cylinder U and a cylinder holder incorporated in the playback device.

13 is a helical scan type reciprocal recording of FIG.
6A and 6B are a perspective view of a rotary cylinder U and a fixed cylinder part built in the reproducing apparatus, and FIG. (B) is a development view of the rotary cylinder U. (C) is a development view of the fixed cylinder portion.

14 is a helical scan type reciprocal recording of FIG. 1 above.
The rotation and the movement state of the rotary cylinder U built in the reproducing apparatus are shown, (A) is a horizontal sectional view and a vertical sectional view of the rotary cylinder U, (B) is a FW direction R / P operation at the time of It is a cross-sectional view and a side view of the rotating cylinder U, (C) is REV
FIG. 3 is a lateral cross-sectional view and a side view of the rotary cylinder U during R / P operation in the direction.

FIG. 15 is a helical scan type reciprocal recording / reproducing apparatus in which an R / P head dedicated to the FW direction and an R / P dedicated to the REV direction are used.
FIG. 6 is a perspective view of a rotary cylinder U having a P head in an FW direction R / P operating state.

16 is a perspective view of the rotary cylinder U of FIG. 15 in an R / P operation state in the REV direction.

17 is a plan view of the rotary cylinder U shown in FIG.

FIG. 18 is a side view of the rotary cylinder U of FIG. 15, in which (A) is a head for R / P in the FW direction and R / R in the REV direction.
It is a side view when the mounting phase of the head for P is in agreement, (B) is a side view when the said phase shifts 90 degrees.

FIG. 19 shows a helical scan type reciprocating recording / reproducing apparatus in which an R / P head dedicated to the FW direction and an R / P dedicated to the REV direction are used.
The perspective view of the modification of the rotary cylinder U which has a P head.

FIG. 20 shows a helical scan type reciprocating recording / reproducing apparatus in which a dedicated RW direction R / P head and a dedicated REV direction R / P head
The perspective view of another modification of the rotary cylinder U which has a P head.

FIG. 21 is an R / P head and R dedicated for the FW direction, which are unitized in the reciprocal recording / reproducing apparatus of the helical scan system.
The perspective view of the rotary cylinder U which has a R / P head for exclusive use of EV direction.

22 is an exploded perspective view of a head unit applied to the rotary cylinder U of FIG. 21.

23 is a plan view of the rotary cylinder U of FIG. 21.

FIG. 24: RW direction dedicated R / P head and R unitized in a helical scan type reciprocating recording / reproducing apparatus
The perspective view of the modification of the rotary cylinder U which has the R / P head for exclusive use of the EV direction.

FIG. 25 is a helical scan type reciprocal recording of FIG. 1 above.
FIG. 3 is a plan view around a rotary cylinder U incorporating a tape lining mechanism applicable to a reproducing apparatus.

FIG. 26 is a perspective view of a tape lining mechanism incorporated in the helical scan type reciprocal recording / reproducing apparatus of FIG. 25.

27 is a perspective view of a modified example of the tape lining mechanism of FIG. 26, (A) shows one modified example, and (B) shows another modified example.

28 is a modification of the tape lining mechanism of FIG. 26, and is a wing guide perspective view in which a lining action portion is arranged, FIG. 28 (A) shows a concentric cylindrical protrusion at the center of the wing guide. The perspective view of what was arrange | positioned, (B) is the perspective view of what arrange | positioned the spherical protrusion in the center part of a wing guide.

FIG. 29 is a perspective view of another modification of the tape lining mechanism of FIG. 26, in which a lining action portion is provided, and (A) is a projection of an eccentric cylinder at the center of the wing guide. Is a perspective view of the wing guide, and (B) is a perspective view of the wing guide in which a circular arc projection is provided at the center.

30 is a plan view of a conventional helical scan type reciprocal recording / reproducing apparatus incorporating the tape lining mechanism shown in FIG.

FIG. 31 is a reciprocal recording with the helical scan method of FIG.
FIG. 6 is a perspective view of a pinch roller having a tape running contact control action that can be incorporated in a reproducing device.

32 is a perspective view of a modified example of the pinch roller having the tape running contact control function of FIG. 31. FIG.

FIG. 33 is a perspective view of another modification of the pinch roller having the tape running contact control action of FIG. 31.

34 is a reciprocal recording with the helical scan method of FIG.
FIG. 6 is a perspective view of a capstan having a tape traveling contact control action that can be incorporated into a reproducing device.

35 is a perspective view of a modification of the capstan having the tape traveling contact control action of FIG. 34. FIG.

FIG. 36 is a perspective view of another modified example of the capstan having the tape running contact control function of FIG. 34.

FIG. 37 is a perspective view of a conventional helical scan type reciprocal recording / reproducing apparatus.

38 is a perspective view around the rotary cylinder U of the helical scan type reciprocal recording / reproducing apparatus of FIG. 37, which is a view taken in the direction of arrow C in FIG. 37.

39 is a perspective view showing a loaded state of the tape cassette in the helical scan type reciprocal recording / reproducing apparatus of FIG. 37. FIG.

FIG. 40 is a diagram showing a track format in the helical scan type reciprocal recording / reproducing apparatus of FIG. 37, in which (A) shows an A side recording track, and (B) shows an A side recording track and a B side recording track. Both are shown.

[Explanation of symbols]

3 …………………… Rotating cylinder U (rotating cylinder) 12 …………………… Solenoid (means for moving the rotating cylinder relatively) 34 …………………… Cylinder holder (relatively moving the rotating cylinder) Means) 35 ........... Rack (Means for relative movement of rotating cylinder)

Claims (1)

[Claims] 1. A helical structure comprising: a rotary cylinder for recording / reproducing; and means for relatively moving the rotary cylinder to a predetermined recording / reproducing surface on the tape in correspondence with the running direction of the tape. Scan type reciprocal recording / reproducing device.