JP3148541B2 - Magnetic recording / reproducing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording / reproducing apparatus such as a VTR (Video Tape Recorder), and more particularly, to a magnetic recording / reproducing apparatus having a fixed magnetic head such as a full-width erase head in a tape running system. It concerns the device.

[0002]

2. Description of the Related Art A conventional magnetic recording / reproducing apparatus of this type, for example, a VTR will be described below with reference to FIGS. Here, FIG. 5 is a schematic plan view showing a configuration of a conventional magnetic recording / reproducing apparatus on the rotary cylinder entrance side of a tape running system, and FIG. 6 is a front view showing a full width erasing head and a guide post in the conventional magnetic recording / reproducing apparatus. FIG.

In FIG. 5, 1 is a tape cassette, 2 is a magnetic tape drawn out of the tape cassette 1, 3 is a vertical pole, 4 is a tension pole for adjusting the tape tension of the magnetic tape 2, and 5 is a magnetic tape. 2, a guide post for regulating the traveling height; 6, a full-width erasing head for erasing video and audio signals during recording; 7, an entrance-side guide roller; 8, an entrance-side inclined pole; Rotating head cylinder to do.

The magnetic tape 2 pulled out of the tape cassette 1 passes through a vertical pole 3, a tension pole 4, and a guide post 5, and then contacts a full-width erasing head 6. The full-width erasing head 6 does not operate during reproduction, but performs VTR during recording.
An erasing magnetic field is generated by a high-frequency current generated by an internal oscillation circuit, and all signals already recorded on the magnetic tape 2 are erased.

The magnetic tape 2 that has passed through the full-width erasing head 6
After passing through the entrance-side guide roller 7 and the entrance-side inclined pole 8, the vehicle travels around a rotary head cylinder 9 equipped with a magnetic head (not shown) whose rotation angle is inclined at a predetermined angle by a half turn or more. I do. Here, a magnetic head (not shown) of the rotary head cylinder 9 records and reproduces a video signal on the magnetic tape 2 diagonally one field at a time.

Next, the guide post 5 and the full-width erasing head 6 in the above-described tape running system will be described with reference to FIG. The guide post 5 has a stepped shape whose diameter is reduced in the middle, and a magnetic tape (not shown) is attached to a shaft 11 having a base end planted on the base 10 and a screw part screwed at the front end. Insert a lower flange 12 for guiding the lower end of the tape, and a guide portion 13 having a length substantially equal to the tape width,
The lower flange 12 and the guide portion 13 are fixed by screws 14.

The full-width erasing head 6 is screwed and fixed to the base 10 with screws 15.
A magnetic tape (not shown) whose traveling height position is regulated by the lower flange 12 is wound. As a result, the magnetic tape (not shown) comes into contact with a predetermined position of the full-width erasing head 6 and an accurate signal erasing process is performed.

[0008]

However, in the above-described conventional magnetic recording / reproducing apparatus, the guide post 5 in front of the full-width erasing head 6 is required.
Since the number of parts of the guide post for guiding the magnetic tape 2 is increased, it is difficult to reduce the size of the tape traveling system. Further, the tape running height accuracy is determined by the height tolerance from the base 10 to the stepped portion of the shaft 11 (the surface receiving the lower flange 12) and the thickness tolerance of the lower flange 12, and therefore, The cumulative error at each guide post tends to increase, making it difficult to construct a highly accurate tape running system.

In order to eliminate the need for a guide post,
A pedestal as a magnetic head supporting / adjusting mechanism is formed by an upper horizontal frame, a lower horizontal frame, and a vertical frame, and the upper horizontal frame and the lower horizontal frame form a guide portion for guiding a magnetic tape, Japanese Patent Laid-Open No. 5-
120770 proposes.

However, in the case of the one proposed here, guide posts are not required, but frames forming pedestals are required on the upper, lower, left and right sides of the existing magnetic head. There was a problem that space saving was hindered.

The present invention has been made in view of the above-described problems, and it is possible to easily secure the accuracy of the tape running height while reducing the number of components for regulating the tape running height. It is another object of the present invention to provide a magnetic recording / reproducing apparatus capable of realizing space saving of a tape traveling system.

[0012]

According to the present invention, there is provided a magnetic recording / reproducing apparatus which performs magnetic recording / reproducing by winding a magnetic tape around a rotary head cylinder having a rotary magnetic head mounted thereon. The fixed magnetic head itself is provided with a guide member substantially concentric with the fixed magnetic head for regulating the running height of the magnetic tape.

[0013]

In the magnetic recording / reproducing apparatus according to the present invention, the guide height of the magnetic tape is regulated by the guide member provided on the fixed magnetic head itself. No post is needed,
The number of components can be reduced, and the accuracy of the tape running height can be easily ensured. Furthermore, since the guide member is provided on the fixed magnetic head itself,
The space for the tape running system can be saved, and the size of the device can be reduced.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the magnetic recording / reproducing apparatus of the present invention will be described with reference to FIGS. 1 and 2. The same parts as those in the above-mentioned conventional example are denoted by the same reference numerals, and the description thereof will be omitted. Here, FIG. 1 is a perspective explanatory view showing a full-width erasing head in the magnetic recording / reproducing apparatus of this embodiment, and FIG. 2 is a perspective exploded explanatory view showing a full-width erasing head in the magnetic recording / reproducing apparatus of this embodiment.

The magnetic recording / reproducing apparatus of this embodiment includes a full-width erasing head 26 having a tape guide member 21 as shown in FIG. And the other configuration is the same as the above-mentioned conventional example.

The tape guide member 21 is formed of a flat metal plate, and has an inner peripheral portion 22 having a radius substantially equal to a curvature of a sliding surface of a magnetic tape (not shown) of the full width erasing head 26; An outer peripheral portion 23 concentric with the center of curvature of the sliding surface of the magnetic tape (not shown) of the head 26 and having an appropriate distance, and substantially perpendicular to the outer peripheral portion 23 and perpendicular to the tape sliding surface of the tape guide member 21; Locking guide 24 projecting from
And

[0017] Here, locking draft internal 24 (not shown) the magnetic tape full-width erasing head 26 and the inner dimensions substantially equal to the sliding direction of the housing dimensions, square in central latch hole 2
4a.

Meanwhile, the housing right and left sides of the full-width erasing head 26, a magnetic tape (not shown) as seen from the sliding surface is substantially equal guide portion 27 in the thickness of the locking draft inside 24 of the tape guide member 21 Is provided. In this guide section 27,
The upper guide portion 27a is provided at a height substantially equal to the lower end of the magnetic tape (not shown) when the magnetic tape runs (not shown).
Projections to be engaged is provided in the locking hole 24a of the first locking draft internal 24.

In the magnetic recording / reproducing apparatus constructed as described above, the tape guide member 21 is inserted into the full width erasing head 26 from the direction of the sliding surface of the magnetic tape (not shown). The lower guide portion 27b of the full-width erasing head 26 is engaged with the engaging hole 24a of the member 21 so as to be attached and fixed.

Thus, a magnetic tape (not shown)
The lower end is guided by the upper surface of the tape guide member 21 on the tape sliding surface of the full-width erasing head 26, so that the tape running height can be regulated with high precision.

Next, another embodiment of the magnetic recording / reproducing apparatus of the present invention will be described with reference to FIGS. 3 and 4. The same parts as those in the above-mentioned embodiment are denoted by the same reference numerals, and the description thereof will be omitted. I do. Here, FIG. 3 is a perspective explanatory view showing a full-width erasing head in the magnetic recording / reproducing apparatus of the present embodiment, and FIG. 4 is a perspective exploded explanatory view showing a full-width erasing head in the magnetic recording / reproducing apparatus of the present embodiment.

In the magnetic recording / reproducing apparatus of this embodiment, the metal tape guide member 31 attached to the full-width erasing head 36 is used.
Has a bent shape having elasticity. The tape guide member 31 is a magnetic tape (not shown) of the full width erasing head 36.
An inner peripheral portion 32 having a radius substantially equal to the radius of curvature of the sliding surface; an outer peripheral portion 33 concentric with the center of curvature of the sliding surface of the magnetic tape (not shown) of the full-width erasing head 36 and having an appropriate distance; The tape guide member 31 has a locking guide portion 34 which is bent substantially perpendicularly to the outer peripheral portion 33 in a U-shape, and which projects perpendicularly to the tape sliding surface of the tape guide member 31.

[0023] Here, the locking draft internal 34, the inner dimension (not shown) the magnetic tape full-width erasing head 36 and substantially equal to the sliding direction of the housing dimension thereof, square in central latch hole 3
4a.

On the other hand, the housing right and left sides of the full-width erasing head 36, a magnetic tape (not shown) as seen from the sliding surface, approximately equal to the width (vertical) dimension of the locking proposal interior 34 of the tape guide member 31 A guide portion 37 is provided. This guide part 37
, The upper guide portion 37a is provided at a height substantially equal to the lower end of the tape when the magnetic tape (not shown) runs, and the upper guide portion 37a and the lower guide portion 3 are provided.
Between 7b, locking proposal interior 34 of the tape guide members 31
Is provided with a projection 37c that engages with the locking hole 34a.

In the magnetic recording / reproducing apparatus configured as described above, the tape guide member 31 is inserted into the full width erasing head 36 from the direction of the sliding surface of the magnetic tape (not shown). The projection 31c of the full-width erasing head 36 is engaged with the locking hole 34a of the member 31 to be fixedly attached. At this time, the tape guide member 31
Locking guide part 34 is inserted midway in the elastic deformation, the engagement
After the protrusion 37c of the full-width erasing head 36 is engaged with the locking hole 34a of the stopper draft internal 34 prevents falling off by its own elasticity.

Thus, a magnetic tape (not shown)
The lower end of the tape guide member 31 is guided by the upper surface of the tape guide member 31 on the tape sliding surface of the full-width erase head 36, so that the tape traveling height can be regulated with high precision.

In the above embodiment, the full-width erasing head has been described as the fixed magnetic head. However, the A / C head (voice / control head) and the voice erasing head disposed on the tape running system on the exit side of the rotary head cylinder are described. Obviously, the present invention may be used for a fixed magnetic head or the like composed of a combination with a head.

[0028]

According to the magnetic recording / reproducing apparatus of the present invention, the running height of the magnetic tape is regulated by the guide member provided on the fixed magnetic head itself. A guide post for regulating the tape running height is not required, so that the number of components can be reduced and the accuracy of the tape running height can be easily ensured. Further, since the guide member is provided on the fixed magnetic head itself, the space for the tape traveling system can be saved, and the size of the device can be reduced.

[Brief description of the drawings]

FIG. 1 is a perspective explanatory view showing a full-width erasing head in an embodiment of a magnetic recording / reproducing apparatus of the present invention.

FIG. 2 is an exploded perspective view showing a full-width erasing head in one embodiment of the magnetic recording / reproducing apparatus of the present invention.

FIG. 3 is a perspective view showing a full-width erasing head in another embodiment of the magnetic recording / reproducing apparatus of the present invention.

FIG. 4 is an exploded perspective view showing a full-width erasing head in another embodiment of the magnetic recording / reproducing apparatus of the present invention.

FIG. 5 is a schematic plan view showing a configuration of a tape traveling system on a rotary cylinder entrance side in a conventional magnetic recording / reproducing apparatus.

FIG. 6 is an explanatory front view showing a full-width erase head and a guide post in a conventional magnetic recording / reproducing apparatus.

[Explanation of symbols]

 21, 31 Tape guide member 24, 34 Locking guide portion 26, 36 Full width erasing head 27, 37 Guide portion

Claims (2)

(57) [Claims] 1. Wound around a rotary head cylinder
Mounted on the rotating head cylinder on the traveling magnetic tape
In the magnetic recording / reproducing apparatus for performing recording / reproducing with the magnetic head provided , the rotary head cylinder of the tape traveling system is used.
A full width erase head is provided at the entrance side of the
Tape for guiding the lower end of the sliding surface of the magnetic tape of the pad
A guide member is attached, and the tape guide member is a flat gold plate.
And in front of the full-width erase head.
Inner circumference having a radius equal to the curvature of the sliding surface of the magnetic tape
Locking guide that has
The locking guide part has an inner dimension to be erased by the full width.
Is set equal to the width of the pad in the sliding direction of the magnetic tape.
A locking hole is provided at the center of the locking guide, and the entire width is erased.
On the left and right side surfaces of the head, there are
A guide portion, and a part of the guide portion is provided with the locking scheme.
The tape is provided with a protrusion for engaging an internal locking hole.
When attaching the guide member to the full width erase head,
The tape guide member is magnetically moved with respect to the full-width erase head.
The air guide tape is inserted from the sliding surface direction to engage the locking guide.
A magnetic recording / reproducing apparatus , wherein a projection of the guide section is engaged with a blind hole and fixed . 2. Wound around a rotary head cylinder
Mounted on the rotating head cylinder on the traveling magnetic tape
In the magnetic recording / reproducing apparatus for performing recording / reproducing with the magnetic head provided , the rotary head cylinder of the tape traveling system is used.
A full width erase head is provided at the entrance side of the
Tape for guiding the lower end of the sliding surface of the magnetic tape of the pad
A guide member is attached, and the tape guide member has a bent shape.
Metal, and of the full width erase head.
Inner circumference having a radius equal to the radius of curvature of the sliding surface of the magnetic tape
Section and bent in a “U” shape perpendicular to the tape sliding surface
And the locking guide portion is provided with
Indicates the inner dimension of the full width erase head in the sliding direction of the magnetic tape.
And set at the center of the locking guide part
A hole is provided, and the left and right sides of the full-width erase head are
A guide portion equal to the width dimension of the locking guide portion is provided,
A part of the guide part is engaged with the locking hole of the locking guide part.
A protrusion is provided to erase the tape guide member from the full width.
When attaching the tape guide member to the head,
Or sliding surface direction of the magnetic tape relative to the full-width erasing head
From the guide part into the lock hole of the lock guide part.
A magnetic recording / reproducing device, wherein the raised portion is engaged and fixed .