JPS5857813B2 - Recording/playback device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for recording or reproducing audio or video signals or general data signals using a relatively wide recording tape.

An object of the present invention is to provide a recording/playback device that improves the usage efficiency of recording tape and is capable of high-density, long-time recording/playback. The second objective is to make it possible, and the third objective is to make it possible to easily perform recording and reproduction at a predetermined sampling period in the recording/reproducing apparatus described above.

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

As shown in FIGS. 1, 2 and 4, the rotating drum 11
consists of a cylindrical body with a bottom, and a recording tape 1 is placed inside it.
A supply reel 14 and a take-up reel 15 of No. 3 are housed and mounted.

The tape 13 pulled out from the supply reel 14 is pulled out through the gap 12 of the rotating drum 11, goes around the outer peripheral surface, is taken inside again through the gap 12, and reaches the take-up reel 15.

The rotating drum 11 is rotationally driven by a rotating shaft 17 of a motor 16, and the supply reel 14 and take-up reel 15 are rotated in accordance with the rotation of the rotating drum.

These rotation drive mechanisms will be described later.

Note that 18 is a substrate to which the rotating drum 11 and motor 16 are attached.

Recording and reproducing heads 21 and 22 are arranged facing the outer peripheral surface of this rotating drum 11.

These two heads 21 and 22 are held by a guide shaft 23 and a feed screw 24, and as the feed screw 24 rotates, both heads move in the width direction of the tape 13 while maintaining the same distance.

When the feed screw 24 rotates in the opposite direction, both heads 21, 2
2 moves in the opposite direction.

This head 21.22 consists of three blocks 25.26.29 as shown in FIGS. 5 and 6.

The block 25 smoothly moves the entire head 21 by a precise amount of movement as the feed screw 24 rotates.

The block 26 is disposed inside the block 25 so as to be freely protrusive and retractable, and can be freely protruded and retracted by the action of the electromagnetic coil 27.

The block 29 is rotatably attached to the block 26 by a pin 28, and an arbitrary rotation angle can be obtained by the action of an electromagnetic coil 30.

A magnetic head 31 is attached to this block 29.

During recording and reproduction, the block 26 protrudes and the magnetic head 3
1 in contact with the tape 13, and in the case of a pond, the block 26
is retreating.

The reason why the block 29 is rotatable is for tracking control.

That is, as shown in FIG. 7, the magnetic head 31 includes an erasing magnetic head 33, a recording/reproducing magnetic head 34, and a tracking control reproducing head 35, which are arranged on a head mount base 32 at the relative positions shown in the figure.
, 3.6.

Tracking control playback heads 35 and 36 track one or more tracks 13 recorded on tape 13.
1 from both sides in the width direction.

If the position of the recording/reproducing magnetic head 34 deviates from the position of the track 131, the output of either one of the tracking control reproducing heads 35, 36 becomes erroneous, and the output of the performance becomes small.

Therefore, the current flowing through the electromagnetic coil 30 is controlled according to this output difference, and the block 29 is rotated to adjust the position of the magnetic head 31, thereby controlling the recording/reproducing magnetic head 34 to be aligned with the track 131. That's what I do.

The rotation of the tracing feed screw 24 of the head 21, 22 is driven by the power transmitted from the rotating shaft 17 of the motor 16, as described below, and is synchronized with the rotation of the rotating drum 11.

That is, as shown in FIGS. 2 and 3, the rotation of the rotating shaft 17 is transmitted to the pulley 42 via the belt 41.

A gear 43 is attached to this pulley 42.

The pulleys 42 and 43 are rotatably held by a lever 46, and an identical gear 44 that meshes with gear 43 is attached to this lever.

This lever 46 can be rotated freely by the pin 45 to
is attached to.

By operating lever 46, gear 43 or 44 meshes with gear 47.

The gear 47 is connected to the feed screw 24.

Therefore, by operating the lever 46, the feed screw 24 can be rotated at the same rotational speed but in different directions.

Next, the rotational drive mechanism of the rotating drum 11 and the supply reels 14 and 15 will be described.

As shown in FIGS. 2, 3, and 4, the rotating drum 11
is directly connected to the rotating shaft 17 of the motor 16.

A lever 51 that rotates together with the rotating drum 11 is attached to the bottom of the rotating drum 11, and a pulley 52 and a pinch roller 55 are attached to the tip of the lever 51 so as to be freely rotatable.

A belt 54 is placed between this pulley 52 and a fixed pulley 53 fixed to the base plate 18.

The lever 51 can rotate by a predetermined small rotation angle with respect to the rotating drum 11, and is always at an intermediate position.

A spring 62 and a roller 63 provided at the bottom of the rotating drum 11
are working to maintain this intermediate position.

When the electromagnetic coil 60 or 61 provided at the bottom of the rotating drum 11 is actuated, the lever 51 is attracted to one side thereof, and the pinch roller 55 is pressed into contact with one of the idlers 56 and 57 for driving the reel.

Note that 5B and 59 are friction brakes for the reel driving idlers 56 and 57.

When the rotating drum 11 rotates, the pulley 52 rotates.

Therefore, the reel 14 or 15 is rotated by being pressed against the pinch roller 55 rotating together with the pulley 52 or the idler 56 or 57.

Note that 64 is a brush attached to the bottom of the rotating drum 11, and a slip ring 6 attached to the base plate 18
5, electrical connection is made between the rotating drum 11 and the substrate 18 side.

The supply reel 14 is composed of a tape cartridge γ1 as shown in FIG.

This tape cartridge 71 consists of a container in which the tape 13 is wound.
The end of 3 is peeking out.

A coupling pin 73 is attached to the end of this tape 13.

On the other hand, a positioning guide pin 81 is provided on the bottom surface 85 of the rotating drum 11, and the end of the leader tape 82 that has been placed along the outer peripheral surface of the rotating drum 11 from the take-up reel 15 is placed. There is.

A coupling pipe 83 is attached to the end of the leader tape 82, and by engaging this pipe 83 with a leaf spring 84 attached to the bottom surface 85 of the rotating drum 11, the end of the leader tape 82 is fixed. Fixed.

A notch 74 for positioning the tape cartridge 71
is attached to the guide pin 81,
The pin 73 or the pipe 83 is fitted to connect the leader tape 82 and the tape 13, and the cartridge 7
The leaf spring 84 is pushed by the lower end of the pipe 83 to release the engagement with the pipe 83.

At this time, when the take-up reel 15 is rotationally driven, the cart t
-' The tape 13 of the IJ joint 71 is pulled out by the leader tape 82 and placed on the outer peripheral surface of the rotating drum 11.

Next, the operation of the above device will be explained.

First, it is assumed that the tape cartridge 71 is installed as described above, and the tape 13 is pulled out by the leader tape 82 and placed along the outer peripheral surface of the rotating drum 11.

At this time, the rotating drum 11 and the feed screws 24 of the heads 21 and 22 are rotated by the motor 16 at a constant speed.

The electromagnet 60 attached to the bottom surface of the rotating drum 11 operates to attract the lever 51 in that direction, and the pinch roller
55 is pressed against the 1 drive idler 57 of the take-up reel.

Therefore, the rotation of the rotary drum 11, the supply speed of the tape 13, and the tracing speed of the heads 21 and 22 have a fixed relationship with each other and are synchronized.

While the rotating drum 11 rotates n times, the head advances by a distance a, and the tape 13 is fed by a length L/2.

Here, L is the rotating drum 1 as shown in FIGS. 9 and 11.
A recording area 132 having a length b, which is the length of the outer circumferential surface of the recording area 1 and excluding the interval α of the gap 12, forms a recording area 132 of aXb.

Note that W indicates the width of the tape 13.

The recording areas 132 and 133 have a parallelogram shape because the tape 13 is fed according to the rotation of the rotating drum.

First, tracing is performed in the recording area 132 by the upper head 21.

As shown in FIG. 11, tracing starts from the upper left end of the recording area 132, one revolution of the rotating drum ends when it reaches the right end, and in the next revolution, tracing is performed again from the left end to the right end.

When the rotating drum rotates n times in this way, the upper head 21
reaches the lower left end of the upper recording area 132.

At this time, the lower head 22 has reached the lower left end of the lower recording area 133, and the switching lever 46 is switched by an appropriate means to change the direction of rotation of the feed screw 24.

Then, heads 21 and 22 moved from above to below.
will now move from the bottom to the top.

In this way, the lower recording area 133 is
The trace starts from its left bottom edge.

When the lower head 22 finishes tracing the lower recording area 133 and reaches the upper left end of the recording area 133, the upper head 21 then starts tracing from the upper left end of the next upper recording area 132.

In this way, the heads 21 and 22 work alternately, and the upper recording area 132 and the lower recording area 133 are alternately and continuously traced.

Therefore, continuous recording or reproduction is possible using the heads 21, 22.

When recording and reproducing video signals, the rotary drum 11 is rotated at a constant speed of 30 or 600 revolutions per second, and one frame or one field of video signals is recorded and reproduced on each recording track. Enable playback.

Note that in Figures 9, 10, and 11, arrow A indicates tape 13.
Indicates the direction of travel.

Next, a case in which sampling recording is performed will be explained.

First, leave the rotational speed of the rotating drum 11 as it is,
A case will be described in which recording is performed on a recording track extending over the entire circumference of the rotary drum 11 only once every m rotations.

In this case, the amount of movement of the heads 21°22 is
1 is lowered so that it advances by a distance a while it rotates mXn times.

Further, the feed rate of the tape 13 is also reduced to 1/m, that is, the tape 13 is made to advance by L/2 while the rotating drum 11 rotates mXn times.

In this way, the human power signal to be recorded is 1 m rotations of the drum 11.
The sample is sampled through a gate having a sampling period that is opened only once, and is recorded in the recording areas 132 and 133 of the tape 13.

In this case, the pattern of the recording areas 132, 133 is the same as in the previous embodiment (see FIG. 9).

Next, a case where sampling recording is performed by reducing the rotational speed of the drum 11 will be described.

For example, the pattern of the recording area when the rotational speed is reduced to 1/2 is shown in FIG.

If the rotational speed is reduced to 1/2, the track length for the same recording time will be 1/2.

Therefore, sampling recording can be performed by gating the input signal with a predetermined gate circuit so that recording ends after 1/2 rotation.

Generally, when the sampling frequency is X, drum 1
The rotation speed of 1 is reduced to 1/X.

In this case, the length of one recording track (if the recording time is the same) is 1/X of that shown in FIG. 9.

At this time, both the head movement speed and tape feeding speed must be reduced to 1/X.

In the above embodiment, one motor 16 drives the rotary drum 11, the head, and the tape feeder, but each motor is configured to operate synchronously using separate motors. Good too.

After performing various types of recording and playback as described above, the electromagnetic coil 61 is operated to attract the lever 51 in that direction, and the pinch roller 55 is pressed against the idler 56 for driving the supply reel to rewind the tape into the cartridge. 71.

By stopping the rotation of the rotating drum 11, the cartridge 71 can be taken out.

As explained above with respect to the embodiments, according to the present invention, the width of the recording track is made extremely small to increase the recording density for the recording area of the tape and improve the usage efficiency, thereby achieving high-density and long-time recording and playback. becomes possible.

Furthermore, by using two heads, continuous recording and reproduction becomes possible.

Furthermore, by changing the rotational speed of each part, sampling recording/reproduction at a predetermined period is possible.

[Brief explanation of drawings]

1 is a top view of the embodiment, FIG. 2 is a front view, FIG. 3 is a bottom view, FIG. 4 is a sectional view taken along the line IV-IV in FIG. 3, and FIG. 5 is an enlarged view of the head 21. A front view, FIG. 6 is a sectional view taken along the line Vl-Vl in FIG. 5, and FIG. 7 is a cross-sectional view of the magnetic head 3.
1 is an enlarged front view of the tape 13, FIG. 8 is an enlarged perspective view of a portion including the cartridge 71, and FIGS. 9 to 11 are diagrams showing patterns of recording areas on the tape 13 for explaining the operation of the embodiment. 11... Rotating drum, 13... Recording tape, 14... Supply reel, 15...
・Take-up reel, 16...Motor, 21, 2
2...Head.

Claims (1)

[Scope of Claims] 1. A supply reel and a take-up reel of recording tape are housed and mounted in a rotating drum, and the tape is guided and transferred at a constant speed along the outer circumferential surface of the rotating drum, and the It has two recording and reproducing heads arranged side by side at a predetermined interval in the width direction of the tape so as to reciprocate in the width direction of the tape according to the rotation of the drum, and the two recording and reproducing heads move in one direction. Recording and reproducing device 2 characterized in that one head is used when moving and the other head is used when moving in the other direction to record or play back on the corresponding tape surface. A supply reel and a take-up reel for recording tape are housed and installed in the recording tape, and the tape is guided and transferred at a constant speed along the outer peripheral surface of the rotating drum, and the tape is moved in the width direction of the tape according to the rotation of the rotating drum. It has two recording/reproducing heads that are arranged side by side at a predetermined interval in the width direction of the tape so as to move back and forth in the tape width direction, and when the two recording/reproducing heads move in one direction, one head is moved in the other direction. When moving to the tape, recording or reproduction is performed on the corresponding tape surface using the head of the capacity, and the relationship between the rotation speed of the rotary drum, the transport speed of the tape, and the movement speed of the head is determined as appropriate. 1. A recording and reproducing apparatus characterized in that recording or reproducing is performed at a predetermined sampling period by changing the sampling period.