JPS604276Y2 - Endless tape recording/playback device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an endless tape recording and reproducing device that uses a pulse motor and is advantageous in terms of compatibility. To reproduce a plurality of pulses recorded on a control track at the end of recording or reproduction of a track, and to move the head in small steps perpendicular to the tape running direction using the reproduced pulses while the tape is running. It is an object of the present invention to provide an endless tape recording/reproducing apparatus configured to accurately move a head from one channel track to another channel track in a short time without interrupting a recording/reproducing signal.

Conventionally, devices that use tape to record and play back endlessly include (1) a device that records and plays back endlessly for a relatively long time by running the tape back and forth several times; (2) a device that uses endless tape; There was a device that recorded and played back endlessly by moving the head up and down between each channel track.

However, in the conventional device (1) above, the tape stops once during the period when the running direction of the tape is reversed, so a signal cannot be recorded or reproduced for a short period of time, and also in the conventional device (2) above. Similarly, when the head is switched up and down, signals are not recorded or reproduced for a short period of time, and recording or reproduction cannot be performed completely continuously.

The present invention consists of an endless tape on which a predetermined number of continuous control pulses are recorded in some sections, and a pulse motor in which a recording/reproducing head is coupled via a worm gear conversion mechanism that converts rotational motion into linear motion. use,
Most of the endless tape forms parallel tracks parallel to the tape's longitudinal direction, and at the transition from one channel to another, a control pulse is first reproduced, and then a corresponding pulse is divided. By constantly driving the pulse motor intermittently from a predetermined position,
By forming inclined tracks that are inclined at the same angle, a continuous track can be formed without interrupting the signal, and a track that does not cause tracking errors and has extremely easy tape compatibility can be formed. Each of the drawbacks has been eliminated, and one embodiment thereof will be described below with reference to the drawings.

FIG. 1 shows a head moving mechanism of an embodiment of an endless tape recording and reproducing device using a pulse motor according to the present invention, together with a track pattern of an endless tape, and FIG. 2 shows a block diagram of an embodiment of a pulse motor drive circuit. Show the diagram.

In FIG. 1, reference numeral 1 denotes an endless tape with 6 tracks and 3 channels, and its recording surface has, along its longitudinal direction, a control track 2, first channel tracks 4a, 4b1, second channel tracks 5a, 5b, and third channel track 6a. , 6b are formed parallel to each other in a portion other than the head movement period portion, which will be described later.

3 is a predetermined plurality of control pulses recorded at predetermined positions on the control track 2.

Note that when performing high-density recording with endless tape by decreasing the track width and increasing the number of channels or tracks, or when the length of endless tape is long (
It goes without saying that the predetermined number of control pulses in control tracks 2 and 3 may remain as they are even if the pulse length is shortened (shorter).

Reference numeral 7 denotes a recording/reproducing head, which is fixed to the upper end of the worm bar 10 and records or reproduces two tracks of any channel.

Reference numeral 8 denotes a pulse motor, which is intermittently rotated by a drive pulse input to a rotation angle corresponding to the number of input pulses.

A worm 9 that meshes with the worm bar 10 is fixed to the rotation shaft of the pulse motor 8.
The head 7 moves up and down as a result of the rotation.

The microswitch 11 is pressed and closed by the lower end of the worm bar 10 when the head 7 moves to the first channel track 4a, 4b or the second channel track 5a. When it is located at 5b, it is in the open state.

Note that l is the moving width of the head, which indicates the distance from one channel track to the next channel track, and α indicates the inclination angle of the track pattern in the section in which the head 7 moves between channels.

During recording or reproduction, the tape 1 is continuously run.

When the head 7 finishes recording or reproducing signals on the first channel tracks 4a, 4b, a fixed control head (not shown) starts reproducing the control pulse 3 recorded on the control track 2.

The reproduced control pulse signal is amplified and then supplied to the control pulse input terminal 12 shown in FIG.

The pulse signal supplied to terminal 12 is on the one hand passed through frequency divider 1
3, the frequency is divided by 1/M by a positive integer M corresponding to the number of channels, and the pulse signal is then supplied to the pulse switch circuit 14. The pulse signal at the other terminal 12 is directly supplied to the pulse switch circuit 14. Supplied.

Here, the head 7 has first channel tracks 4a and 4b.
Since the microswitch 11 is in the l position, the microswitch 11 is open.

Therefore, since no signal is supplied to the microswitch signal input terminal 15, the pulse switch circuit 14 passes the signal from the frequency divider 13 and supplies it to the forward/reverse circuit 16.

Since no signal is also supplied from the terminal 15 to the forward/reverse circuit 16, the signal from the frequency divider 13 is outputted from the forward/reverse circuit 16 as a forward signal.

This forward signal is used by the pulse motor drive amplifier circuit (P
The signal is supplied to the MDA (MDA) 17, where it is amplified and then supplied as a pulse motor drive signal to the pulse motor 8, which is driven and rotated intermittently.

As a result, the pulse motor 8 is intermittently rotated in the forward direction, and the head 7 is moved downward by a worm gear mechanism having a worm 9 and a worm 10.

“The pulse motor 8 rotates intermittently at an angle corresponding to the number of pulse signals sequentially reproduced by the fixed control head, and the head 7 rotates intermittently at an angle corresponding to the number of pulse signals sequentially reproduced by the fixed control head. moved, Nx l
When the /Mth pulse signal is supplied to the pulse motor 8, the movement from the first channel tracks 4a, 4b to the second channel tracks 5a, 5b is completed.

Here, N is the total number of control pulses 3 recorded on the control track 2, M is a positive integer corresponding to the number of channels, and is also the frequency division ratio of the divider 13.

FIG. 3 is a timing chart in which the horizontal axis represents time and the vertical axis represents the position of the head 7. In FIG.

During the time from to to tl, the head 7 is located on the first channel tracks 4a and 4b, and during the time from tl to t2, it moves to the second channel tracks 5a and 5b.

The number of control pulses N/necessary to move the head 7 from the first channel track 4a, 4b to the adjacent second channel track 5a, 5b, that is, to move the head 7 by one track, during the time from tl to t2.
M is determined by the ratio of the moving width and the width sent by one pulse, and if the rotation angle of the pulse motor 8 is θ (rad/l pulse), the pitch of the gear is P1, and the moving width of the head is 1, then N/ M=2? r]/θP.

When the reproduction of the control pulse 3 is finished, the pulse motor 8 stops intermittent rotation, the head 7 accurately reaches the second channel track 5a, 5b, and starts recording or reproducing the second channel.

2nd channel track 5a, 5 of endless tape 1
When the recording or reproduction of the signal to b is completed, the control pulse 3 is reproduced again by the fixed head, and the head 7 moves to the second channel track 5a, 5 in the same manner as above.
b to the adjacent third channel track 6a, 6
Move to b.

At this time, the head 7 is moved at time t in FIG.

When the head 7 finishes moving to the third channel track 6at6b, the lower end of the worm bar 10 supporting the head 7 closes the microswitch 11.

When the tape 1 continues to run and the head 7 finishes recording or reproducing the signal on the third channel track 6at6b, the fixed control head reproduces the control pulse 3 recorded on the control track 2 again.

Here, since the output signal of the above-mentioned closed microswitch 11 is supplied to the pulse switch circuit 14 via the microswitch signal input terminal 15, the pulse switch circuit 14 receives the pulse directly supplied from the control pulse input terminal 12. Signal forward/reverse circuit 16
supply to.

At this time, the microswitch signal from the terminal 15 is also supplied to the forward/reverse circuit 16, so the circuit 16 outputs a pulse signal for reverse (reverse rotation), which is sent to the pulse motor drive amplifier circuit 17. After being supplied and amplified, it is supplied to the pulse motor 8, which is driven to rotate intermittently in the reverse direction.

As a result, the head 7 moves upward and moves from the third channel tracks 6a, 6b to the first channel tracks 4a, 4b.

At this time, the output signal of the pulse switch circuit 14 is
Since it is the reproduction pulse itself from No. 2 and is not frequency-divided, when moving from the first to the second channel track,
and M times the number of pulses when moving from the second to the third channel track.

Therefore, the head 7 moves by M times the width of the above-mentioned movement, and therefore the head moves from the third channel track 6ay6b to the first channel track 4a, 4b.

During this period, no recording/reproduction signal is supplied to the head 7, and no signal is recorded or reproduced onto the endless tape 1.

The second 18 is an external manual forward terminal, and 19 is an external manual reverse terminal, which manually rotates the pulse motor 8 in the forward or reverse direction, moves the head 7 downward or upward, and connects the channel. This is a signal input terminal for arbitrarily performing a track selection operation.

Moreover, the upper limit of the slope α of the track pattern during the movement period from one channel track to another adjacent channel track of this device is determined by the response speed of the pulse motor 8, and the inclination α of the track pattern during the movement period from one channel track to another adjacent channel track is determined by the response speed of the pulse motor 8, and the width The upper limit is determined by the hunting amount of the pulse motor 8.

Furthermore, by reducing the slope α of the track pattern in accordance with the response speed time error of the head drive device, tracking errors can be reduced.

As described above, the present invention provides an apparatus for recording or reproducing information on a plurality of channel tracks parallel to the longitudinal running direction of an endless tape using a recording/reproducing head. Continuous control pulses are recorded, and when the recording/reproducing head is moved from one channel track to another adjacent channel track, a predetermined number of consecutive first control pulses are reproduced by the fixed control head. The first control pulse is a positive integer M corresponding to the number of the plurality of channels.
The endless tape is connected to the recording/reproducing head via a worm gear conversion mechanism in a predetermined direction perpendicular to the longitudinal direction of the endless tape running through the recording/reproducing head in accordance with the second number of pulses whose frequency is divided by 1/M. A pulse motor is used to intermittently displace the track in small width increments, and move the recording/reproduction signal from the last channel without interrupting while forming a track with a predetermined inclination accurately in a short time to other channel tracks. To the first channel, the recording/reproducing head is moved in a short time in the opposite direction to the predetermined direction according to the number of first control pulses, and at any time according to the number of pulses supplied from the external manual terminal. Since the head is moved to the track of the endless tape, continuous recording and playback is possible without interrupting the signal even during the head movement period, and therefore the continuous recording and playback time can be extended. Parallel tracks parallel to the direction and also inclined tracks when moving from one channel track to another adjacent channel track are controlled by a fixed control head with a constant predetermined angle regardless of the length of the endless tape. Since an inclined track is formed from a position corresponding to the position of the reproduced control pulse, highly accurate tracking without tracking errors is possible, and even when there are endless tapes of different lengths, it is possible to Only one type of control pulse is required to be continuously recorded in a partial section of the tape, so a track pattern can be formed that is highly compatible with tapes. A crossing inclined track is formed by the intermittent drive of the pulse motor using the pulses of It has features such as:

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing the head moving mechanism of one embodiment of the device of the present invention together with the track pattern of an endless tape, FIG. 2 is a block diagram of one embodiment of the pulse motor drive circuit of the device of the present invention, and FIG. 3 4 is a timing chart showing the moving state of the head, and FIG. 4 is an enlarged partial view of the track pattern during the head moving period. 1... Endless tape, 2... Control track, 3... Control pulse, 4a, 4b... First channel track, 5
at 5 b...second channel track, 6 at 6 b...third channel track, 7...recording/reproducing head, 8...pulse motor, 9... Warm, 10...
・Warm bar, 11...Micro switch,
12... Control pulse input terminal, 13.
... Frequency divider, 14 ... Pulse switch circuit, 15 ... Micro switch signal input terminal,
16...Forward reverse circuit, 17.
...Pulse motor drive amplifier circuit (PMDA), 1
8...External manual forward terminal, 1
9...External manual reverse terminal.

Claims (1)

[Scope of utility model registration request] In an apparatus that performs recording or reproduction using a recording/reproducing head on a plurality of channel tracks parallel to the longitudinal running direction of an endless tape, a predetermined number of continuous control pulses are recorded in a predetermined partial section of a control track of the endless tape. When the recording/reproducing head is moved from one channel track to another adjacent channel track, the fixed control head reproduces the predetermined number of continuous first control pulses, and the reproduced first control pulse The pulse is divided into 1/ by a positive integer M corresponding to the number of channels.
Pulses that are coupled to the recording/reproducing head via a worm gear conversion mechanism in a predetermined direction perpendicular to the longitudinal direction of the endless tape running on the recording/reproducing head in accordance with a second number of pulses whose frequency is divided into M. The motor displaces the channel intermittently in small increments in order to form a track with a predetermined inclination to other channel tracks in a short time, while moving the recorded and reproduced signal without interruption. To the channel, the recording/reproducing head is moved in a direction opposite to the predetermined direction in a short time according to the number of first control pulses, and an arbitrary number of pulses are supplied from the external manual terminal. An endless tape recording and reproducing device characterized in that the endless tape recording and reproducing device is configured to move the tape to the following tracks.