JPH056730B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a queue head for a magnetic recording/reproducing device.

For 8mm video tape recorders, the length of the 180 degree point of the video track and the cue signal position is defined as the X value (30mm) to ensure compatibility, as shown in Figure 1. The cue signal thus recorded at a predetermined position is normally used for cueing.

By the way, in order to protect the magnetic tape, prevent head wear, and avoid problems such as increasing the size of the motor due to increased tape winding torque during fast forwarding in FF/RWD mode, FF/RWD wraps the tape around the drum. It is done without. In particular, as tapes have become thinner in recent years, problems such as permanent elongation of the magnetic tape itself and peeling of the magnetic layer tend to occur, and from this point of view as well, it is preferable not to wrap the magnetic tape around the drum in FF/RWD mode.

Therefore, as shown in Fig. 2, in the REC/PB mode, if the cue head 1 is installed at a predetermined position that satisfies the X value from the 180 degree point of the video track, and the cue signal is recorded at this position, As shown by the dotted line, cue head 1 moves away from magnetic tape 2 in FF/RWD mode.
It cannot be used for cue signal reproduction.

Therefore, in the conventional example, the queue head 1 was used for recording, and a reproduction queue head 3 was added. For this reason, two queue heads were required.

The present invention has been made in view of the above points, and its object is to provide a queue head in a magnetic recording/reproducing device that has a single queue head.

In order to achieve the above object, the present invention provides a magnetic tape that is located in the traveling direction of the magnetic tape by a distance l from the position that satisfies the X value, and that supports REC/PB mode and FF/FF/
1 at the position where the magnetic tape is wound in RWD mode.
It is characterized by having two recording/reproducing queue heads.

The present invention will be explained below with reference to embodiments shown in the drawings.

FIG. 3 shows the state in REC/PB mode. The magnetic tape 2 wound around the drum 4 having a rotating head is wound around the recording/reproducing queue head 5 from the 180 degree point A to the position B corresponding to the X value, and then at the position C at a distance l in the direction of movement of the magnetic tape 2. attached.

FIG. 4 shows the state in FF/RWD mode. The magnetic tape 2 separated from the drum 4 is wound around a recording/reproducing queue head 5 as in FIG.

As can be seen from the explanations of both figures above, the recording/reproducing queue head 5 can be used in REC/PB mode and FF/FF mode.
The distance l is determined so that the magnetic tape 2 is wound around both in the RWD mode.

With this configuration, the recording/reproducing queue head 5 is provided at a position where the queue signal is recorded a distance l earlier than the conventional queue signal recording position, so that compatibility is maintained unless the distance l is corrected. It lacks sex. Therefore, as shown in FIG. 5, a conventional cue signal generation circuit 6 is used to generate a cue signal 9 by using V.sync as a cue signal for a certain period determined by a monomulti 7 and transmitting it to the cue head 5 via a delay device 8. Let it be recorded. This delay device 8
is delayed by a time corresponding to distance l from the tape speed in REC/PB mode, and the cue signal recorded in this way is completely different from that recorded by the cue head at the position corresponding to the conventional X value. are the same. Therefore, it is possible to provide compatibility as before.

As explained above, the present invention is arranged at a position where the magnetic tape is wound in both the REC/PB mode and the FF/RWD mode, and furthermore, at a position separated from the position corresponding to the X value by a distance l in the traveling direction of the magnetic tape. A recording/reproducing queue head is provided, and a delay device is provided so that the recording of the queue signal is performed after the magnetic tape has advanced by a distance corresponding to the distance l, so that compatibility can be maintained and the number of queue heads can be reduced to one.

The delay device is described above as a means for delaying the time corresponding to the distance l, but it may also be a device that detects the amount of advance of the magnetic tape from a frequency generator or the like and records a queue signal when the distance l is reached.

[Brief explanation of the drawing]

FIG. 1 is a tape pattern diagram showing the relationship between a conventional queue signal and a video track, FIG. 2 is a plan view showing a queue head of a conventional magnetic recording/reproducing device, and FIGS. 3 and 4 are an embodiment of the present invention. FIG. 5 is a plan view showing the cue head of a magnetic recording/reproducing apparatus in REC/PB mode and FF/RWD mode, and FIG. 5 is a circuit diagram showing an outline of a cue signal generating circuit. 2... Magnetic tape, 4... Drum, 5... Recording/reproduction queue head, 6... Queue signal generation circuit,
8...Delay device.

Claims (1)

[Claims] 1. In both the REC/PB mode and the FF/RWD mode, the magnetic tape is wound around the magnetic tape, and from the 180 degree point of the magnetic tape wound around the drum, a predetermined position further in the traveling direction of the magnetic tape than the position corresponding to the X value. A magnetic recording/reproducing device characterized in that a recording/reproducing queue head is provided at a position advanced by a distance, and a delay device for delaying the queue signal by an amount corresponding to the predetermined distance is provided between the queue signal generating circuit and the recording/reproducing queue head. equipment cue head.