JPH05174461A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To provide a magnetic recording and reproducing device miniaturized and thinned and whose tape travels stably. CONSTITUTION:Respective one inclined guide 12, 23 are arranged through a guide roller on the upstream side and the downstream side of a rotary head drum 3 and the rotary shaft of the rotary head drum 3 is inclined slightly larger than the angle of a track in the direction of the feeding side reel 1a of a cassette roughly. Further, at least one piece of a height control guide 15 loading no tape is placed in the position of the most vicinity of the upstream side of the rotary head drum 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a so-called helical scan type magnetic recording / reproducing apparatus such as a video tape recorder (VTR) or a digital audio tape recorder (DAT) for obliquely recording / reproducing information on / from a magnetic tape. ..

[0002]

2. Description of the Related Art A helical scan type magnetic tape running system in which a magnetic tape is obliquely wound around a rotary head drum to run is known.
There are various loading methods depending on the reference height and the arrangement of guides. VH is a typical loading method
S, M used in 8mm VTR and R-DAT
Loading method, β, U used in 8 mm VTR, new U loading method, etc. A conventional M-loading type magnetic tape running system is disclosed, for example, in Japanese Patent Application Laid-Open No. 57-212651, and its main configuration is shown in FIG. 2, a rotary head drum 3, a capstan 4, and a pinch roller 5 are provided.
The magnetic tape 2 unwound from the supply reel 1a passes through the tension regulator guide 31, the guide rollers 32 and 33, and the inclined guide 34 inclines the running surface of the magnetic tape.

After that, information is recorded / reproduced by the rotary head drum 3, returned to the original tape cassette traveling plane by the tilt guide 41, sandwiched between the capstan 4 and the pinch roller 5 via the guide roller 42, and fixed. Can be driven at speed. And finally, it is taken up by the take-up reel 1b through the guide 43. For example, when the track angle is as large as about 9.4 °, the inclination angle of the rotary head drum 3 and the magnetic tape winding angle are about 22 °.
The inclination angles of the inclination guides 34 and 41 and the magnetic tape winding angle are 22.2 ° and 73.0 ° on the supply side and 33.7 ° and 42.2 ° on the winding side, respectively. .. In the M loading method, the inclination angle of the rotary head drum is about twice the lead angle of the rotary head drum, and the tape winding load is large because the angle of wrapping the magnetic tape around the inclination guides 34 and 41 is large. There are difficulties.

A new U-loading type magnetic tape running system is disclosed, for example, in Japanese Patent Application Laid-Open No. 2-166653, and its main structure is, as shown in FIG. The magnetic tape 2 fed out from the 1a is the tension regulator guide 5
1, it goes through the guide roller 52, and is tilted upward by the tilt guide 53. After that, the magnetic tape 2 passes through the guide roller 54 and is further inclined by the inclination guide 55. Information is recorded / reproduced by the rotary head drum 3 on the magnetic tape 2 whose traveling is stabilized by the guide roller 56 and the height regulation guide 57.
After that, the magnetic tape 2 passes through the height regulation guide 61,
It is sandwiched between the capstan 4 and the pinch roller 5 and run at a constant speed. And finally, the guide roller 6
It is taken up by the take-up reel 1b of the tape cassette through

The tilt angle of the rotary head drum 3 of this magnetic tape running system is the same as the track angle when the running head is stationary, and is equal to the lead angle provided on the rotary head drum 3. For example, when the track angle is 9.4 °, the tape winding angles on the tilt guides 53 and 55 are 38.3, respectively.
The angle is 10.0 °, and the tape running load is smaller than that of the M loading type magnetic tape running system. In the new U-loading type magnetic tape running system, since the loading mechanism is complicated, the thickness and depth of the mechanism are more disadvantageous than the M loading type, but in terms of running stability of the magnetic tape, rotation Since height restriction guides that prevent loading are provided on the upstream side and the downstream side of the head drum, it is advantageous as compared with the M loading type magnetic tape running system.

[0006]

However, when the track angle becomes large, that is, when the inclination of the magnetic tape traveling with respect to the rotary head drum becomes large,
With the conventional tape path, it is difficult to reduce the size of the mechanism. The track angle of an ordinary helical scan type magnetic recording / reproducing apparatus such as a VHS type VTR is 5 to 5.
The angle is about 6 °. At this time, in the M loading method, the drum tilt angle is about 10 to 14 °, but when the track angle becomes 9.4 °, the drum tilt angle becomes 22 °, which makes it difficult to reduce the thickness. Further, since the tilt angles of the tilt guides 34 and 41 are large, the depth dimension advantageous in the M loading method also becomes large. Further, although the drum inclination angle is small even in the new loading method, the capstan motor must be lowered because of the presence of parts such as the loading ring, and the depth dimension behind the rotary head drum becomes large. The guide roller 5 is on the upper side of the mechanism.
Since 6 is high, it cannot be expected that the device as a whole will be small and thin. Therefore, the present invention provides a magnetic recording / reproducing apparatus having a tape traveling system capable of eliminating such drawbacks in a loading type magnetic recording / reproducing apparatus and achieving a compact and thin mechanism and stable tape traveling. The purpose is.

[0007]

In order to achieve the above-mentioned object, the magnetic recording / reproducing apparatus of the present invention has one inclined guide on each of the upstream side and the downstream side of the rotary head drum via guide rollers. Is provided, and the rotary shaft of the rotary head drum is arranged so as to be tilted substantially in the direction of the reel on the supply side of the cassette tape and slightly larger than the track angle. Also, at the position closest to the upstream side of the rotary head drum,
At least one height regulation guide that does not perform tape loading is installed.

[0008]

With the above structure, the mechanism can be downsized and at the same time stable tape running performance can be obtained.

[0009]

Embodiments of the present invention will be described with reference to the drawings. 1A and 1B are a plan view and a side view of an embodiment of a magnetic recording / reproducing apparatus, and 1 is a tape cassette,
Reference numeral 2 is a magnetic tape, 3 is a rotary head drum, 4 is a capstan, and 5 is a pinch roller. The magnetic tape 2 fed from the supply-side reel 1a of the tape cassette 1 passes through the tension regulator guide 11 and the tilt guide 12
Is tilted upward by. After that, the magnetic tape 2 passes through the guide rollers 13 and 14 and the height regulating guide 15 and information is recorded / reproduced by the rotating head drum 3. Then, the magnetic tape 2 which has passed through the guide rollers 21 and 22 and has been returned to the original traveling plane by the inclined guide 23 is sandwiched between the capstan 4 and the pinch roller 5 and is made to travel at a constant speed. Finally, it is wound around the take-up reel 1b via the guide 24.

The positions of the slant guides 12 and 23 need to be arranged so as to contact the intersection lines 19 and 29 of the magnetic tape running surface and the cassette reference surface on the upstream side and the downstream side of the rotary head drum 3, which are called cross lines. There is. Therefore, the size of the mechanism is this cross line 1
It is greatly influenced by 9, 29. In the traveling system of the magnetic recording / reproducing apparatus of the embodiment, the lead angle of the rotary head drum 3 is 9.4.
In spite of the fact that the rotation head drum 3 has a rotation angle of slightly greater than the track angle toward the supply reel 1a of the tape cassette 1, the rotary shaft of the rotary head drum 3 has a supply side cross line 19 and a winding side cross line. 29,
The tape running system is miniaturized by positioning it as shown in FIG.

The winding angle and the tilt angle of the tilt guide in the magnetic recording / reproducing apparatus of this embodiment are the same as those of the supply side tilt guide 12.
Are 45.2 ° and 25.1 °, and the winding-side tilt guide 23 has 26.5 ° and 14.6 °, respectively.
In the traveling system of this embodiment, since the tape winding angle on the tilt guides 12 and 23 is small, the tape traveling load of the magnetic tape is reduced as in the U and new U loading systems. The inclination angle of the rotary head drum 3 of this embodiment is 10.0 °, which is less than half the inclination angle of the rotary head drum in the conventional M-loading type magnetic recording / reproducing apparatus, and requires a mechanism such as a loading ring. Because there is no such thing,
As shown in (a) and (b), it is possible to make the mechanism small by increasing the inclination angle of the rotary head drum 3 to 12 ° and sliding the tape cassette.

Regarding the running stability of the magnetic tape, the height of the magnetic tape 2 is regulated by the guide roller 14.
Is very good because it enters the rotary head drum 3 in a state where the upper side is accurately regulated by the height regulation guide 15 at the position closest to the rotary head drum 3. Further, the height regulation guide 15 is used for the rotary head drum 3.
Like, don't load. Therefore, the relative positional relationship with respect to the rotary head drum 3 is always maintained precisely,
Stable running of the magnetic tape can be realized without the risk of abrasion due to repeated loading. Also,
In the present embodiment, the height regulation guide 15 is a fixed guide that does not rotate, but it is a precise rotating roller type to reduce the running load.
You may lower it further. The rotating roller may be made to have an inertia so as to function as an impedance roller that reduces jitter.

[0013]

As is apparent from the above description, according to the magnetic recording / reproducing apparatus of the first aspect, the inclination angle of the rotary head drum can be made small, and the mechanism can be made small and thin. Further, in the magnetic recording / reproducing apparatus of the second aspect, in the magnetic recording / reproducing apparatus of the first aspect, since the height regulation guide which does not perform the tape loading is arranged at the position closest to the rotary head drum, the running of the magnetic tape Stabilization can be realized.

[Brief description of drawings]

1A and 1B are respectively a plan view and a side view showing a magnetic tape running system of a magnetic recording / reproducing apparatus according to an embodiment of the present invention.

2A and 2B are a plan view and a side view, respectively, of a magnetic tape running system of a magnetic recording / reproducing apparatus according to a second embodiment of the present invention.

3A and 3B are respectively a plan view and a side view showing a magnetic tape running system of a conventional M-loading type magnetic recording / reproducing apparatus.

4 (a) and 4 (b) are respectively a plan view and a side view showing a magnetic tape running system of a conventional magnetic recording / reproducing apparatus of a new loading system.

[Explanation of Codes] 1 tape cassette, 2 magnetic tape, 3 rotating head drum, 4 capstan. 12, 23 Inclined guide 15 Height regulation guide

Claims (2)

[Claims] 1. A rotary head drum for recording / reproducing information on / from a magnetic tape, and a guide roller for feeding a magnetic tape from a tape cassette and guiding it to the rotary head drum.
In a magnetic recording / reproducing apparatus having a tape running system including a tilt guide for inclining a magnetic tape running surface for winding a magnetic tape obliquely around a rotary head drum, a tension arm for stably running the magnetic tape, a capstan, a pinch roller, and the like, One inclined guide is provided on each of the upstream side and the downstream side of the rotary head drum via a guide roller, and the rotary shaft of the rotary head drum is set slightly closer to the supply reel of the cassette tape than the track angle. A magnetic recording / reproducing apparatus, which is arranged with a large inclination. 2. The magnetic recording / reproducing apparatus according to claim 1, wherein the rotary head drum is located at a position closest to the upstream side of the drum.
A magnetic recording / reproducing apparatus provided with at least one height regulation guide which does not perform tape loading.