JPS628301A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To reproduce reversely a track immediately after the end of forward (reverse) running of a tape and to apply repetitive reproduction continuously by forming a track string for reverse running to a gap of a track string for forward running. CONSTITUTION:A capstan 16 is rotated at a number of rotations being twice of that of a conventional device at recording, a magnetic tape 1 is run forward, heads 12, 13 form track strings 24a, 24b sequentially on the magnetic tape 1 and record a signal. The interval of the forward track strings 24a, 24b is twice or over of one track width. When the tape reaches its end, the capstan 16 starts rotation reversely at the same number of rotations as that of the forward direction instantly. Since the progressing direction of the tape is reversed, the tilt of the tracks 22, 23 at reversing is less than that of the track string 24 at forward running.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic recording/reproducing device (video tape recorder) that can continuously and repeatedly reproduce the same magnetic tape.

[Conventional technology]

In conventional video tape recorders, the method of repeatedly playing back the same magnetic tape is, for example, by playing it to the end of the tape and then rewinding it at high speed to the beginning of the tape.
There was a method of regenerating from the beginning again.

FIG. 2 is a diagram for explaining an example of the conventional device as described above. FIG. 2(a) shows the video recording and reproducing section thereof, and FIG. FIG. 2 is a diagram schematically showing a magnetic tape on which a video signal is recorded. In the figure, a video recording/reproducing section 10 has a rotatable head drum 1) at a position where a magnetic tape 1 runs, and the head drum 1) has heads 12 and 13 for recording or reproducing video signals. , are spaced apart by a certain angle (180° in this figure) on its circumference. The head drum 1) is provided with a diagonal 16 for the magnetic tape 1 wound around a supply reel 14 and a take-up reel 1Δ, and a pinch roller 17.

Incidentally, when the VTR is of the VH3 system, the relative positional relationship between the length direction of the magnetic tape 1 and the hent drum 1) is such that the tracks formed on the tape 1 are downward to the right and upward to the left. Therefore, the magnetic pattern of the video signal recorded on the magnetic tape 1 is as shown in FIG.
``Track 3 being recorded will be recorded at an azimuth of 16 degrees. Note that X in the figure indicates the running direction of the magnetic tape 1, and y indicates the running direction of the head.

Next, the operation will be explained. First, during recording, the capstan 16 rotates at a constant speed so that the magnetic tape l runs at a predetermined speed, and the heads 12 and 13 sequentially and alternately form track rows 4a and 4b on the magnetic tape 1, respectively.
Record the signal.

Then, the terminal tracks 2 .
After recording signals up to 3, the magnetic tape 1 is rewound onto the supply reel 14.

Next, during playback, the magnetic tape 1 starts running from the beginning part due to the rotation of the capstan 16, so that the heads 12 and 13 slide on the tracks alternately and sequentially play back the signals. Become.

Then, the head 12.13 is at the end of the tape track 2.
After reproducing the signal No. 3, the pinch roller 17 separates from the magnetic tape 1, the magnetic tape 1 separates from the capstan 16 and the head drum 1), and is rewound by the supply reel 14. The magnetic tape 1 rewound to the starting end in this way is mounted on the head drum 1) again, and the capstan 1)
6 and the pinch roller 17, the reproducing operation is started from the first track of the track rows 4a, 4b of the magnetic tape 1. By repeating the above operations, the same magnetic tape is repeatedly reproduced.

[Problem that the invention seeks to solve]

Since the conventional magnetic recording/reproducing apparatus is configured as described above, there is a drawback that reproduction is interrupted during rewinding. On the other hand, there is a method in which the magnetic tape is a special magnetic tape, so-called endless tape 1, and the unfinished portion of this magnetic tape is wound on the same reel again to perform continuous playback. In some cases, a special tape is used, which has the disadvantage of being expensive and complicated.

This invention was made in order to eliminate the above-mentioned drawbacks, and it is an object of the present invention to provide a video tape recorder that is inexpensive and can easily and continuously perform repeated playback without using special tapes. purpose.

[Means for solving problems]

The video tape recorder according to the present invention allows the magnetic tape to run in the reverse direction, and when running in the forward direction, a track row is formed on the magnetic tape with a sufficient gap of the track width or more, and when running in the reverse direction, a track row is formed on the magnetic tape with a sufficient gap of the track width or more. The track rows are formed in the gaps between the track rows when the vehicle travels in the forward direction.

[Effect]

In this invention, the tape is made to run in the reverse direction as well, and the track row for the reverse direction is formed in the gap between the track rows for the forward direction, so that the tape stops running in the forward direction (reverse direction). Sometimes, it can be played immediately in the opposite direction, and repeated playback can be performed continuously.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1(a) shows a video recording and reproducing section of a VTR according to an embodiment of the present invention, and FIG. 1(b) schematically shows a magnetic tape on which a video signal is recorded by the video recording and reproducing section. It is a diagram. In the figure, l and 10 to 17 are the same as the conventional device, 22 and 23 are recorded reverse tracks and reverse tracks being recorded, and 24 is a series of previously recorded forward track rows. It is.

The operation will be explained below.

First, during recording, the capstan 16 is placed on the 2nd floor of the conventional device.
The magnetic tape 1 rotates at the above rotational speed, thereby causing the magnetic tape 1 to run in the forward direction, and the heads 12 and 13 sequentially form track rows 24a and 24b on the magnetic tape 1 to record signals. At this time, the interval between the forward track rows 24a and 24b is more than twice the width of one track, as is clear from the figure. After sequentially forming forward running track rows on the magnetic tape 1 in this way, when the tape reaches the end, the capstan 16 stops instantaneously and then rotates in the reverse direction at the same number of rotations as in the forward direction. start. and,
As a result, the magnetic tape 1 runs in the opposite direction, and the head 12
．． 13, a track array is sequentially formed starting from tracks 22 and 23 to the beginning of the tape, and signals are recorded. At this time,
Since the traveling direction of the tape is reversed, the inclination of the tracks 22 and 23 when traveling in the reverse direction is less than that of the track array 24 when traveling in the forward direction, as shown in the figure.

At this time, in order to reduce interference between adjacent forward and backward running tracks during playback, the backward running tracks are replaced with the previously recorded forward running tracks 24a, 24.
b, and the azimuth angles of the heads are set in the opposite direction between the tracks when running in the opposite direction.

On the other hand, during playback, the capstan 16 rotates at the same number of rotations as during recording, the magnetic tape 1 runs at a constant speed, and the heads 12 and 13 sequentially scan the track rows on the magnetic tape 1 when running in the forward direction. Play it and go.

When the magnetic tape 1 reaches the end, the capstan 1
6 stops instantaneously, and then rotates in the reverse direction at the same number of revolutions as in the forward direction. Starting from tracks 22 and 23, the track sequence is sequentially reproduced when traveling in the reverse direction. When the beginning of the tape is reached, the capstan 16 stops and rotates in the opposite direction, causing the tape to run in the opposite direction, and at the same time, the signals are played back. In this way, the signals are played back one after another. It is done.

In this manner, in this embodiment, the same magnetic tape can be continuously and repeatedly reproduced without performing rewinding that involves interruption of reproduction. Further, the magnetic tape may be the same as that used in the conventional device, and the device can be obtained easily and at low cost.

In the above embodiments, the signal to be recorded and reproduced is a video signal, but this may be a signal obtained by superimposing an audio signal on a video signal or an audio signal.Also, the video signal may be sent to the head drum 1) on the track where the video signal is recorded. The audio signal may be superimposed and recorded using an audio signal head attached separately from the head.

Furthermore, in the above embodiment, the azimuth angle of recording and reproduction was changed for adjacent forward and reverse tracks, but the azimuth angle may not be changed and a portion where no recording is performed may be provided between forward and reverse tracks. It is possible to prevent interference from adjacent tracks during playback.

Furthermore, in the above embodiment, the running is reversed at the beginning and end of the magnetic tape 1, but the running may be similarly reversed in the middle of the magnetic tape.

In addition, the running direction of these magnetic tapes 1 can be switched by
This can be done using a control signal that controls the rotation of the capstan 16, or by providing means for detecting the start and end of the magnetic tape 1, and using a start or end detection signal from the means as a control signal. can. By doing so, in addition to the effects of the above-described embodiments, it is possible to automatically perform continuous and repeated reproduction without manual intervention.

〔Effect of the invention〕

As described above, according to the magnetic recording and reproducing apparatus according to the present invention, recording and reproducing can be performed regardless of whether the tape is run in the forward direction or the 3& direction. There is an effect that a video tape recorder capable of performing playback can be obtained easily and at low cost.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing a magnetic recording/reproducing apparatus according to an embodiment of the present invention, and FIG. 2 is an explanatory diagram showing a conventional magnetic recording/reproducing apparatus. 1...Magnetic tape, 10...Video recording and playback section, 1)
...Head drum, 12.13...Head, 14.
... Supply reel, 15... Take-up reel, 16... Capstan, 17... Pinch roller, 22.23...
- Reverse track, 24a, 24b...forward track. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (5)

[Claims] (1) In a magnetic recording and reproducing device that sequentially forms diagonal track rows on a magnetic tape using a head attached to a rotating drum and records and reproduces video signals, the magnetic tape is run in the forward direction between adjacent tracks. A magnetic recording characterized in that a forward track array is formed so that an unrecorded portion having a width equal to or greater than the track width is formed, and the magnetic tape is run in a reverse direction to form a reverse track array in the unrecorded portion. playback device. (2) The magnetic recording and reproducing apparatus according to claim 1, wherein the video signal is a signal obtained by superimposing an audio signal on a video signal or an audio signal. (3) A magnetic recording and reproducing apparatus according to claim 1 or 2, characterized in that the azimuth angles of the forward direction track and the reverse direction track that are adjacent to each other are different. (4) Claims 1 to 3, characterized in that the tape position at which the tape running direction should be changed from the forward direction to the reverse direction or vice versa can be changed by a control signal during recording and playback. The magnetic recording/reproducing device according to any one of the items. (5) The magnetic recording and reproducing apparatus according to claim 4, further comprising a detection means for detecting the end portion or the beginning portion of the magnetic tape and outputting the control signal.