JPH03134849A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To prevent disturbance of a reproducing picture due to shape transfer at the time of consecutive recording by rewinding the tape with its recording end position to a supply reel when the consecutive recording is to be performed. CONSTITUTION:The tape 3 is paused under the state of winding around a cylinder by a pause mode, and afterward, when the consecutive recording after this is to be performed again by releasing the pause mode, the recording end position before pausing is once rewound to the supply side reel 1 by a reel driving means 31 after pausing. Then, the recording is resumed after traveling the tape 3 until the tape position on the side of a take-up reel is abutted against a rotary head slightly closer than the end position of the previous recording before pausing by a tape traveling control means 33 with a releasing command for releasing the pause mode. By this method, disturbance of a reproducing picture due to shape transfer at the time of consecutive recording can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a magnetic recording and reproducing apparatus that can be used for continuous shooting 9 of a video tape recorder (hereinafter referred to as a VTR).

2. Description of the Related Art An example of a conventional magnetic recording/reproducing device will be described below with reference to the drawings.

FIG. 3 is a plan view showing a schematic configuration of a conventional magnetic recording/reproducing apparatus, and FIG. 4 is a schematic diagram showing the running position of a magnetic tape in the conventional magnetic recording/reproducing apparatus.

In FIG. 3, 1 is a supply reel housed in the tape cassette 11 and around which the magnetic tape 3 is wound, 12 is also a reel on the winding side, and 2 is a roller post in the cassette housed in the tape cassette 11. It is. 4 is a tension post, 6 is a roller post person, 6 is a full width erase head, 7
is a roller post) B, 8 is a roller post C, 9 is an inclined post, 10 is a cylinder, the magnetic tape 3 is guided by the above components and runs, and the magnetic head mounted on the cylinder 10 (not shown) (2) records audio signals and video signals.

Regarding the conventional magnetic recording/reproducing apparatus configured as described above, the continuous shooting operation will be described below.

First, when the tape 3 is wound around the cylinder 1o and a signal is recorded on the tape 3, when a pause operation is performed, the tape 3 is positioned on the tape 3 as shown in FIG. Pause for a short period of time.

If the tape 3 is wound around the cylinder 10 from section C8 to wait at the position where it was rewound, and then the pause operation is canceled and recording is resumed, the tape 3 is wound from section C8 onwards. A position slightly before &, that is, the end point of recording. Continuation shooting has been carried out by running the tape 3 in synchronization with the already recorded signal to a position slightly closer to the take-up reel 12, and recording the signal after a. To explain this with reference to FIG. 3, the recording end position when recording is temporarily stopped as shown in the figure, that is, the point (X) on the tape where the tape 3 fed out from the supply reel 1 first contacts the magnetic head. is at position B when recording is paused. , but immediately move to position C8'! I wait when it is rewound with I8, and when I restart recording, it does not record and B. X at position A1 slightly closer to the take-up reel. Drive until xo reaches the capital, and resume recording when xo reaches the capital. A specific example of time is the section in FIG. The rewind run of C8 is 1.4
After waiting for a few seconds and restarting recording, from section C8 a
, tape 3 is run without recording for 1.2 seconds until a1
Recording will be performed thereafter. In this case, the previously recorded a
, Crow. Although 0.2 seconds of the interval is recorded overlappingly, this is to prevent the image from becoming distorted or recording to be interrupted at the joint.

Problems to be Solved by the Invention However, in the above configuration, when continuous shooting is performed, during the standby time, that is, C8-! During the time when the tape is rewound and the tape stops running, a shape is transferred to the tape by the VTR running system or the roller post in the cassette. To illustrate this shape transfer, when the tape 3 is wrapped around the post 20 as shown in FIG.
is formed and shape transfer occurs. This shape transfer only disappears when the three concave portions are wound onto the reel, but in the conventional continuous shooting method described above, the roller post located on the supply reel side from the cylinder during recording pause, The shape transferred to the tape by the fixed post or fixed head is immediately recorded on the tape without being erased. To illustrate in the figure,
The inclined post 9 shown in FIG. 3, the roller post C8,
When recording is paused with the tape 3 wrapped around the roller post (roller post) BT, full width erase head 6, roller post) Aes, tension post 4, or roller post 2 in the cassette, the shape is Transfer occurs and is recorded on it immediately after the recording pause is released. When the tape 3 recorded with the shape transferred in this way is later played back with the shape transferred, time axis distortion occurs in the portion where the shape was transferred. Specifically, on the playback screen of a television receiver, there is usually a vertical line D as shown by the person in Figure 7.
As shown in A and B, a song like DB causes a shi. Furthermore, as the tape runs, this song changes to DB-, I)C.
→I) Move as shown in I). However, the degree of distortion and the speed of movement of the track will depend on the diameter of the post that causes shape transfer, the winding angle, recording pause time, tape speed, etc.
It depends on things like the inclination of the post relative to the tape. Also,
If the recording is paused only once, the song on the screen will only occur once for each running system post, but in the section a in FIG. 4. As shown in an, in interval recording, in other words, when recording the blooming of a flower on a single tape, in a method that records for 1 second and repeatedly stops for 59 seconds, this screen The curvature appears one after another, resulting in the screen appearing to be swaying sideways, resulting in a problem in that the quality of the screen is significantly degraded compared to normal continuous recording.

In view of the above-mentioned problems, the present invention provides the following features when performing continuous shooting recording:
The present invention provides a magnetic recording and reproducing device which prevents disturbances in the reproduced screen due to shape transfer during continuous shooting by rewinding the recording end position of the tape onto the supply reel.

Means for Solving the Problems In order to solve the above problems, the magnetic recording and reproducing apparatus of the present invention employs a tape loading method in which a magnetic tape is pulled out from a cassette having a reel around which the magnetic tape is wound and wound around a cylinder having a rotating head. a drive means for driving the reel in the traveling direction of the magnetic tape and the opposite direction; a speed control means for recording and reproducing a tape speed control signal on the magnetic tape; and a tape running control means capable of controlling the running of the tape in the traveling direction and in the opposite direction to the traveling direction according to the received signal, and temporarily stopping the tape in a state where the tape is wound around the cylinder,
When recording continues after that, the end position of the recording before the pause is rewound to the -H supply side reel by the driving means after the pause, and the recording before the pause is resumed by a release command to cancel the pause mode. After the tape is run by the tape run control means until the tape is slightly closer to the take-up reel than the end position of the tape comes into contact with the rotary head, recording is restarted.

Effect of the Invention According to the above-described structure, when performing continuous shooting recording, the present invention rewinds the end position of recording before the pause onto the supply reel, so that the position at which a new signal is recorded after the pause is released is set on the supply reel. This will prevent the reproduced screen from being distorted due to shape transfer during continuous shooting.

Example Below, regarding a magnetic recording and reproducing device according to an example of the present invention,
This will be explained with reference to the drawings.

FIG. 1 is a plan view showing a schematic configuration of a magnetic recording/reproducing apparatus according to an embodiment of the present invention, and FIG. 2 is a block diagram showing the same embodiment.

In FIG. 1, 1 is housed in the tape cassette 11, the supply side renope 12 around which the tape 3 is wound is also the take-up side reel, and 2 is the roller post in the cassette housed in the tape cassette 11. . 4 is a tension post, 5 is a roller host A16 is a full-width erasing head, 7 is a roller post Ja is a roller boss l-C, 9 is an inclined post, 1° is a cylinder with a reed, and the tape 3 is guided by the above components. A magnetic head (not shown) mounted on the cylinder 1o records an audio signal and a video signal. The above configuration is similar to that shown in FIG.

In FIG. 2, 31 is a reel driving means for driving the supply reel 1 in the traveling direction of the tape 3 and in the opposite direction;
33 is a speed control means for recording or reproducing a tape speed control signal, for example, a control signal, on the tape 3;

This is a tape running control means that controls driving of the tape 3 in the forward direction and in the reverse direction by a tape drive means 34 such as a capstan based on a signal obtained by reproducing a tape speed control signal by a speed control means 32.

Regarding the conventional magnetic recording/reproducing apparatus configured as described above, the continuous shooting operation will be described below.

When performing spliced recording as described above, the tape is first run very slightly in the opposite direction to the traveling direction in order to provide a slight overlapping recording portion to prevent image disturbance at the spliced portion. The present invention is characterized in that the amount of travel in this reverse direction is expanded, and the recording end position of the tape is rewound to the supply reel.

To explain based on FIG. 1, the recording end position X on the tape 3 when recording is temporarily stopped. Supply reel 1 as before
Instead of rewinding to an arbitrary position (C8 in FIG. 3) between the , xo reaches A, and xo
When the number reaches A1, recording is restarted.

Next, control of driving the tape 3 will be specifically explained using FIG. 2. In the pause mode, when the tape 3 is temporarily stopped while being wrapped around the cylinder 10, and then the pause mode is canceled and the recording is continued again, the end position of the recording before the pause is changed to the pause position. After that, the reel driving means 31 first rewinds the reel to the supply reel 1.

Next, in response to a release command for canceling the pause mode, the tape running means 3 is moved until the position of the tape on the take-up reel side touches the rotating head slightly from the recording end position before the pause mode.
After the tape 3 is run in step 3, recording is restarted. Conventionally, in the part of the tape 3 where recording is resumed after an arbitrary standby time, there is a shape transfer caused by each post of the traveling system during standby, but with this configuration, the part of the tape 3 where recording is resumed is Since the image is wound on the supply reel 1, there is no shape transfer, and the image quality similar to that of a normal continuous recording portion can be obtained. Even with this configuration, there is shape transfer caused by each post in the traveling system during the standby time, but that portion is at the recording end position X when recording is temporarily stopped. This is a part that exists closer to the take-up reel and has already been recorded, and when it is reproduced again, the shape transfer disappears and has no effect on the image. Similar effects can be obtained in the interval recording described above.

Further, to illustrate this in terms of a specific time, the section in FIG. 4 is used. The tape rewinds from C8 to C8 and waits for 6.4 seconds, and when recording is restarted, the tape is run for 6.2 seconds from section C8 to al without recording, and recording starts from a1 onwards.

As described above, by using this embodiment, it is possible to prevent vertical lines on the screen from shaking during continuous shooting.

Effects of the Invention As described above, according to the present invention, when performing continuous shooting υ recording, by rewinding the end position of the recording before the pause onto the supply reel, the position at which a new signal is recorded after the pause is released is adjusted. The portion that was previously wound on the supply reel is used, and as a result, it is possible to obtain excellent effects such as preventing disturbances in the reproduced screen due to shape transfer during continuous shooting.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing a magnetic recording and reproducing device according to an embodiment of the present invention, FIG. 2 is a block diagram showing the same embodiment, FIG. 3 is a plan view showing a conventional magnetic recording and reproducing device, and FIG. 6 is a schematic diagram showing the moving state of the tape in the same device, FIG. 6 is a perspective view showing the positional relationship between the tape and the post, FIGS. 6A and B are a top view and a plan view showing the tape state, and FIG. 7A ,B,,C
, D are schematic diagrams showing playback screen states. 3... Tape, 31... Reel drive means, 32... Speed control means, 33... Tape running control means, 34... Tape drive means.

Claims (1)

[Claims] a tape loading means for pulling out a magnetic tape from a cassette having a reel around which the magnetic tape is wound and winding it around a cylinder having a rotating head; a driving means for driving the reel in the traveling direction of the magnetic tape and the opposite direction thereof; a speed control means for recording and reproducing a speed control signal on a magnetic tape; and a tape travel control means capable of controlling the tape to travel in a traveling direction and in a direction opposite to the traveling direction using a signal obtained by reproducing the tape speed control signal. When the tape is temporarily stopped with the tape wound around the cylinder and then recording is continued, the recording end position before the temporary stop is changed once to the vicinity of the supply reel by the driving means after the temporary stop. In response to a release command to cancel the pause mode, the tape is run by the tape running control means until the tape position on the take-up reel side contacts the rotating head slightly from the recording end position before the pause mode, and then recording is started. A magnetic recording/reproducing device characterized by restarting.