JPH05242572A - Rotating head type magnetic recording / reproducing device - Google Patents

Abstract

(57) [Summary] [Object] The present invention realizes position regulation in the tape width direction with sufficient accuracy without performing position regulation in the tape width direction by the flange portion of the tape guide, and with a relatively simple mechanism. It is an object of the present invention to provide a rotary head type magnetic recording / reproducing apparatus having a tape traveling mechanism that can be used. [Structure] A magnetic tape 2 on a drum 1 having a rotary head
A helical tape guide 3 is provided in the vicinity of the drum 1 for helically winding the tape, and the movable tape guide 4, as a means for changing the winding angle of the magnetic tape 2 around the diagonal tape guide 3, A rotary head type magnetic recording / reproducing apparatus provided with a motor 5 for swinging the same and an arm 6 for transmitting a rotational force of the motor 5 to the movable tape guide 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary head type such as a video tape recorder (VTR) or a digital audio tape recorder (DAT) having a tape running control mechanism for controlling the position of a running magnetic tape in the width direction. The present invention relates to a magnetic recording / reproducing device.

[0002]

2. Description of the Related Art In a recent rotary head type magnetic recording / reproducing apparatus such as a VTR, a request for long-time recording has led to a high recording density and a thin magnetic tape. Along with this, the rigidity of the magnetic tape is reduced, and damage to the tape edge due to buckling in the tape width direction is becoming a problem.

On the other hand, in order to obtain good recording / reproducing characteristics and device compatibility, it is necessary to stably run the magnetic tape at a prescribed position when winding the magnetic tape around the drum.
Fluctuations in the tape width direction should be suppressed as much as possible.

Therefore, conventionally, a flange portion is provided on a tape guide for guiding the magnetic tape, and the tape edge is pressed against the flange portion to regulate the position,
The method of preventing the fluctuation in the tape width direction has been taken. However, this method is not preferable because it will promote damage to the tape edge when the restriction force at the flange portion is excessive.

On the other hand, as disclosed in Japanese Patent Laid-Open No. 3-83252, the tape traveling path is changed by changing the inclination angle and the inclination direction of the tape guide.
A method of controlling the regulation force in the tape width direction has been proposed.

However, since the tape guide for changing the inclination angle or the like is usually installed immediately before or after the drum having the magnetic head, in order to stably run the magnetic tape at a prescribed position on the drum. Needs to manage the setting of the tilt angle and the like with extremely high accuracy. For that purpose, not only improving the accuracy of parts and assembly,
It is necessary to provide a highly precise adjusting mechanism on the tape guide itself and strictly control the tape running, which requires a very troublesome work.

[0007]

As described above,
As a method of regulating the position in the tape width direction, the method of providing a flange on the tape guide has a harmful effect of promoting damage to the tape edge, and the method of changing the inclination angle of the tape guide manages the setting with extremely high accuracy. However, there is an adverse effect that it requires time-consuming work.

Therefore, in the present invention, in order to eliminate the above-mentioned adverse effect, the position of the tape guide in the tape width direction is not regulated by the flange portion of the tape guide, and the position in the tape width direction is sufficiently accurate with a relatively simple mechanism. An object of the present invention is to provide a rotary head type magnetic recording / reproducing apparatus having a tape running mechanism capable of realizing regulation.

[0009]

In order to achieve the above object, the present invention provides a rotary head type magnetic recording / reproducing apparatus for recording / reproducing a signal by a magnetic head rotating on a running magnetic tape. A rotary head type magnetic device having a drum, an inclined tape guide provided for helically winding a magnetic tape on the drum, and a varying means for changing a winding angle of the magnetic tape around the inclined tape guide. A recording / reproducing apparatus is provided.

Further, the variable means includes a position detection means for detecting the widthwise position of the magnetic tape, and a control circuit for controlling the variable means based on the information obtained by the detection means. Also provided is a rotary head type magnetic recording / reproducing device characterized by having.

[0011]

In order to helically wind a magnetic tape around a drum having a rotary magnetic head, an inclined tape guide is provided near the drum, and the magnetic tape is wound around the inclined tape guide to change the tape running direction. At this time, in order to prevent fluctuations in the width direction of the magnetic tape wrapped around the drum,
Variable means for changing the winding angle of the magnetic tape around the inclined tape guide is provided in the vicinity of the inclined tape guide, and thereby position regulation in the tape width direction is performed.

Further, by providing position detecting means for detecting the position in the tape width direction and performing feedback control based on the information obtained by this means, the winding angle of the magnetic tape around the inclined tape guide is adjusted appropriately. By changing the value, it becomes possible to regulate the position in the tape width direction with higher accuracy.

[0013]

The present invention is characterized in that the position in the tape width direction is regulated by changing the winding angle of the magnetic tape around the inclined tape guide. Therefore, prior to the description of the embodiments, the principle of regulating the position in the tape width direction in the present invention will be described.

The principle of restricting the position of the magnetic tape in the width direction orthogonal to the running direction by one inclined tape guide is described in detail in Japanese Patent Laid-Open No. 3-209659, but will be briefly described below. To do.

As shown in FIG. 9A, the magnetic tape 101
Is defined as a running direction vector t, and a vector lying in the plane of the magnetic tape 101 and perpendicular to the running direction vector t is defined as a width direction vector w. Also, FIG.
As shown in (b), the magnetic tape 101 winds around the inclined tape guide 102 at an angle θ and moves away. Here, this angle θ will be referred to as a winding angle.

Now, as shown in FIG. 9C, it is assumed that the magnetic tape 101 is wound around the inclined tape guide 102 inclined by α in the x-axis direction from the z-axis in the xz plane and separated. Here, the unit traveling direction vector of the magnetic tape 101 before being wound around the inclined tape guide is t ₁ , the unit width direction vector is w _1, and the traveling direction vector of the magnetic tape 101 wound around the inclined tape guide and leaving is t. ₂ and the width direction vector is w ₂ . Japanese Patent Laid-Open No. 3-2096
As shown in Japanese Patent Publication No. 59, the z-direction component of the traveling direction vector t ₂ of the magnetic tape 101 is proportional to the winding angle θ. From this, by changing the winding angle θ of the magnetic tape 101 around the inclined tape guide 102,
It is understood that it is possible to regulate the position in the tape width direction. Next, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a first embodiment of the present invention. An inclined tape guide 3 is provided in the vicinity of the drum 1 in order to helically wind the magnetic tape 2 on the drum 1 having a rotary head. The movable tape guide 4, the motor 5 for swinging the movable tape guide 4, and the rotational force of the motor 5 are transmitted to the movable tape guide 4 as variable means for changing the winding angle of the magnetic tape 2 around the inclined tape guide 3. An arm 6 is provided for this purpose.
Further, an optical sensor 7 is provided on the drum 1 as a position detecting means for detecting the position of the magnetic tape 2 in the width direction.

In the present invention, feedback control as shown in FIG. 2 is performed in order to appropriately change the winding angle of the magnetic tape 2 in accordance with the widthwise variation of the magnetic tape 2 wound on the drum 1. .. Optical sensor 7 shown in FIG.
The information detected by is converted into information by the position detection circuit 8 and then compared with the reference position information 9 to obtain the difference information. This difference information is sent to the control circuit 10, and information for properly controlling the motor 5 is calculated and then fed back to the motor 5. Based on this information, the rotation direction and rotation angle of the motor 5 are controlled to appropriate values,
By swinging the movable tape guide 4 via the arm 6, the winding angle of the magnetic tape 1 around the inclined tape guide 3 is set to an appropriate value.

FIG. 3A shows the details of the optical sensor which is the position detecting means in the tape width direction used in this embodiment. A window 12 is provided on a side surface portion of a fixed cylinder 11 that constitutes the drum 1, and a light emitting element 13 is installed inside the fixed cylinder 11 with the window 12 interposed therebetween.
A light-receiving element 14 that receives light from the light-emitting element 13 is provided outside. The arrow in the figure indicates the optical path. FIG. 3B is a front view of the element, and the hatched portion 15 in the drawing constitutes a light emitting portion or a light receiving portion.

As shown in FIG. 3A, since a part of the light emitted from the light emitting element 13 is blocked by the magnetic tape 2, the light receiving area of the light receiving element 14 changes due to fluctuations in the tape width direction. Therefore, by measuring this change, the position of the magnetic tape 2 in the width direction can be detected. The positional relationship between the light emitting element 13 and the light receiving element 14 is not limited to the above case, and may be the opposite.

FIG. 4 is an explanatory diagram when the present embodiment is applied to a VTR device. Magnetic tape 2 is supply reel 1
6 is pulled out horizontally, the angle is changed by the inclined tape guide 3a on the drum inlet side through various tape guides, helically wound around the drum 1 having a magnetic head, and returned horizontally by the inclined tape guide 3b on the drum outlet side. The tape is taken up by the take-up reel 19 via various tape guides, the capstan 17, the pinch roller 18, and the like.

As shown in FIG. 4, in this embodiment, the movable tape guide 4 is installed in the vicinity of the entrance side inclined tape guide 3a of the drum 1, but the installation position of the movable tape guide 4 is the same as in this embodiment. The present invention is not limited to this, and may be provided, for example, near the outlet side inclined tape guide 3b of the drum 1 or in the vicinity of both the inlet side and outlet side inclined tape guides 3a and 3b.

FIG. 5 shows another method for moving the movable tape guide 4 in this embodiment. In this example, the electromagnetic solenoid 20 is used instead of the motor, and the movable tape guide 4 is linearly moved to change the winding angle of the magnetic tape 2 around the inclined tape guide 3. As described above, the method of moving the movable tape guide 4 is not limited to that shown in the present embodiment, and any method can be used as long as the purpose of changing the winding angle of the magnetic tape 2 around the inclined tape guide 3 can be achieved. Anything is fine.

FIG. 6 shows a strain sensor which is another means for detecting the position in the tape width direction in this embodiment. A window 21 is provided on the side surface of the fixed cylinder 11 constituting the drum 1, a leaf spring 23 having a strain gauge 22 attached thereto is projected from the window 21, and the tip end of the leaf spring 23 supports the lower end of the magnetic tape 2. When the magnetic tape 2 fluctuates in the width direction, the leaf spring 23 bends, and this bending is corrected by the strain gauge 22.
The position in the width direction of the magnetic tape 2 can be detected by measuring with. As described above, the position detecting means in the tape width direction is not limited to this embodiment, and any means can be used as long as the object can be achieved.

7 and 8 show a second embodiment of the present invention. An inclined tape guide 24 for helically winding a magnetic tape 2 on a drum 1 having a rotary head, and a magnetic tape 2 for the inclined tape guide 24.
Movable tape guide 2 for changing the winding angle of
5 and the like are provided on the slider 26. The slider 26 is driven by a slider driving link (not shown) and performs loading / unloading operations along the loading rail 31 shown in FIG. A motor 27 for swinging the movable tape guide 25 is fixed at a predetermined position, and at the time when the slider 26 is completely loaded and positioned at a predetermined position, a rubber roller mounted on the rotation shaft of the motor 27. 28 and an arm 2 for transmitting the rotational force of the motor 27 to the movable tape guide 25.
The rubber roller 30 mounted on the rotating shaft 9 is pressure-bonded. Therefore, by controlling the rotation direction and rotation angle of the motor 27, the rubber roller 2
Movable tape guide 2 via 8, 30 and arm 29
5 to swing the magnetic tape 2 to the inclined tape guide 24.
The winding angle of can be changed.

As shown in FIG. 8, in this embodiment, the movable tape guide 25 and the like are provided on the inlet side of the drum 1, but the position where the movable tape guide 25 and the like are provided is not limited to this embodiment, and for example, the drum 1 It may be provided on both the exit side and the entrance side.

It should be noted that the winding angle of the magnetic tape 2 around the inclined tape guide 24 is appropriately changed according to the means for detecting the position of the magnetic tape 2 in the width direction and the variation in the width direction of the magnetic tape 2. The feedback control and the like performed in order to perform the same are the same as those in the first embodiment, and therefore description thereof will be omitted.

As shown in the above embodiments, according to the present invention, a relatively simple mechanism such as a movable tape guide is caused to perform a simple operation such as a rotational movement by a motor or a linear movement by an electromagnetic solenoid. The position of the magnetic tape in the width direction can be regulated relatively easily.

[0029]

As described above, according to the present invention,
Position regulation in the tape width direction is achieved with sufficient accuracy by a relatively simple mechanism without regulating the tape width direction by the tape guide flange and without requiring strict adjustment of the inclined tape guide itself. It is possible to provide a rotary head type magnetic recording / reproducing device having a tape traveling mechanism that can be used.

[Brief description of drawings]

FIG. 1 is a perspective view showing a first embodiment of the present invention.

FIG. 2 is a conceptual diagram of feedback control in the present invention.

FIG. 3 is an explanatory view of an optical sensor which is a position detecting means in the present invention.

FIG. 4 is an explanatory diagram when the first embodiment is adopted in a VTR device.

FIG. 5 is a perspective view showing another moving method of the movable tape guide in the first embodiment.

FIG. 6 is an explanatory view showing a strain sensor which is another position detecting means in the first embodiment.

FIG. 7 is a perspective view showing a second embodiment of the present invention.

FIG. 8 is an explanatory diagram when the second embodiment is adopted in a VTR device.

FIG. 9 is an explanatory view of the principle of regulating the position in the tape width direction in the present invention.

[Explanation of symbols]

1 Drum 2,101 Magnetic Tape 3,3a, 3b, 24,24a, 24b, 102 Inclined Tape Guide 4,25 Movable Tape Guide 5,27 Motor 6,29 Arm 7 Optical Sensor 8 Position Detection Circuit 9 Reference Position Information 10 Control circuit 11 Fixed cylinder 12, 21 Window 13 Light emitting element 14 Light receiving element 15 Light emitting part or light receiving part 16 Supply reel 17 Capstan 18 Pinch roller 19 Take-up reel 20 Electromagnetic solenoid 22 Strain gauge 23 Leaf spring 26 Slider 28, 30 Rubber roller 31 Loading rail

Claims (3)

[Claims] 1. A rotary head type magnetic recording / reproducing apparatus for recording / reproducing a signal by a magnetic head rotating on a running magnetic tape, comprising: a drum having the magnetic head;
A rotary head type magnetic device having an inclined tape guide provided for helically winding a magnetic tape around the drum, and a variable means for changing a winding angle of the magnetic tape around the inclined tape guide. Recording / playback device. 2. The rotary head type magnetic recording according to claim 1, wherein the variable means comprises a movable tape guide and a movement adjusting means for adjusting the movement of the tape guide. Playback device. 3. The variable means comprises a position detection means for detecting the widthwise position of the magnetic tape, and a control circuit for controlling the variable means based on the information obtained by the position detection means. 1. The method according to claim 1, wherein
The rotary head type magnetic recording / reproducing apparatus described.