JPH10188409A - Magnetic tape recording and reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stabilize the running of a tape by controlling the tape speed in accordance with the output results of a detection means for the total tape winding amount, that of a detection means for the take-up reel rotation period, and that of a detection means for the supply reel rotation period. SOLUTION: The winding diameter of the take-up reel is calculated by a winding diameter computing device 13 in accordance with the periods forwarded from the period detectors 10, 11 and the total tape winding amount forwarded from a discriminator 18 and sent to a switch 15. By a memory 14, the winding diameter is sent to the switch 15 as a specified fixed value. By the switch 15, the winding diameter forwarded from the memory 14 is sent to a reel controller 16 at the time before the detection of the total tape winding amount is finished, and the winding diameter forwarded from the winding diameter computing device 13 is sent to the reel controller 16 after the detection of the total tape winding amount is finished. The actual tape speed is detected by the reel controller 16 in accordance with the FG period forwarded from the period detector 10 and the winding diameter information of the take-up reel forwarded from the switch 15, then a driving signal is supplied to a take-up reel motor 4 so that the difference between the objective speed and the actual speed becomes zero.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tape recording / reproducing apparatus for recording / reproducing information by using a magnetic tape, and more particularly to improvement of operability of the apparatus.

[0002]

2. Description of the Related Art In an apparatus for driving a tape by a reel, a total tape winding amount, which is a value based on a sum of an axial projected area of the tape and a reel hub wound on a take-up reel and a feed reel, is detected. is required.

For example, Japanese Patent Application Laid-Open No. 63-302454 describes a basic method for realizing this.

[0004]

In a device that drives a magnetic tape by a reel without using a means for directly detecting a tape speed such as a capstan or a timer roller, a tape speed control and a tape tension control must be performed accurately.
It is necessary to detect the winding diameter of the take-up reel or the delivery reel in real time. The reel diameter is

[0005]

(Equation 1)

[0006] Here, r (t) is the winding diameter of the take-up reel, T (t) and T (s) are values based on the rotation cycle of the take-up reel and the sending reel, respectively, and S is the total tape winding amount.

The total winding amount of the tape is calculated using the winding diameter of the take-up reel or the delivery reel at an arbitrary time. That is, once the winding diameter of the take-up reel or the sending-out reel is detected at an arbitrary time and the total tape winding amount is calculated, thereafter, the winding diameter can be detected in real time by using the total tape winding amount. The winding diameter of the take-up reel or the feed reel for detecting the total tape winding amount has been conventionally detected by the following method. One is to run the tape in a state where the tape is not wound on the take-up reel or the feed reel, and use the rotation amount of the take-up reel and the feed reel and the known reel hub radius.

[0008]

(Equation 2)

This is a better method. Where n (t), n (s)
Are the rotation speeds of the take-up reel and the sending reel, respectively.
r (t) and r (s) are the winding diameters of the take-up reel and the delivery reel, respectively, and Td is the tape thickness.

One is based on the length of the tape pulled out from the reel when the tape is loaded and the number of rotations of the reel.

[0011]

(Equation 3)

This is a method for calculating the reel diameter.
Here, L is the length of the tape pulled out during loading.

However, in the latter method, since the length of the tape to be pulled out varies from device to device or from operation to operation, the detection accuracy of the winding diameter deteriorates. Further, when the tape path itself changes due to a tape buffer such as a tension sensor, there is a disadvantage that the detection accuracy is further reduced.

On the other hand, the former method can accurately detect the total tape winding amount. However, the detection position of the total tape winding amount is limited to the leading end position or the trailing end position of the tape. Therefore, when a cassette in which the tape is wound on both reels is inserted halfway, the tape is sent to the leading end position or the trailing end position with the reel diameter unknown.
During this time, since the tape speed cannot be detected, the tape must be run at a low speed at which the tape can be stopped immediately after the detection of the tape end. As a result, there has been a problem that the preparation time after inserting the cassette is lengthened.

SUMMARY OF THE INVENTION An object of the present invention is to accurately detect the total winding amount of a tape in a short time to improve the life of the tape and the reliability of the apparatus.

[0016]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention detects the total tape winding amount accurately and in a short time even when a cassette having a tape wound on both reels is inserted. It is configured so that

The above equation (2) is derived from equations (6) and (7). If the tape is run with no tape wound on the take-up reel, the amount of tape movement between the take-up reel and the sending reel is

[0018]

(Equation 6)

[0019]

(Equation 7)

## EQU1 ## Since the amount of tape movement on both reels is equal, r (s) is derived. Where L (t) is the amount of tape movement of the take-up reel, r (t) is the diameter of the take-up reel when the cassette is inserted, Td is the thickness of the tape, n (t) is the number of rotations of the take-up reel, L (s) is the tape moving distance of the sending reel, r
(s) is the winding diameter of the delivery reel when the cassette is inserted, and n (s) is the number of rotations of the delivery reel. In the state where the tape is not wound on the take-up reel, n (t), n (s), Td, and r (t) are known numbers, but if a cassette in the middle of winding is inserted, r (t) Becomes an unknown and r (s) cannot be calculated only by equation (2).

Therefore, a calculation is further performed by adding a formula relating to the winding diameter of both reels.

First, as in the case of equation (2),

[0023]

(Equation 8)

[0024]

(Equation 9)

Is obtained. Further, as a mathematical expression, information on the rotation period or the number of rotations of both reels obtained when the tape is run is obtained.

[0026]

(Equation 10)

Is obtained. Here, T (t) and T (s) are rotation cycle information of the take-up reel and the sending reel immediately after the tape is inserted, respectively, and n1 (t) and n1 (s) are rotation number information immediately after the tape is inserted.

From equations (8), (9) and (10),

[0029]

(Equation 4)

And r (s) can be calculated. Here, equations (8) and (9) are obtained when the tape is run in the reverse direction, but r (s) can be calculated using the equation when the tape is run in the forward direction. It is. In other words, by obtaining the winding diameter ratio between the take-up reel and the sending reel when the cassette is inserted and the information detected by the tape running after the cassette is inserted, the total winding of the tape can be performed even when the cassette in the middle of the winding state is inserted. The amount can be detected.

That is, means for driving the tape, take-up reel rotation cycle detection means for detecting information corresponding to the cycle of a frequency signal proportional to the rotation speed of the take-up reel,
Sending reel rotation period detecting means for detecting information corresponding to the cycle of the frequency signal proportional to the rotation speed of the sending reel, and take-up reel for detecting information corresponding to the wave number of the frequency signal proportional to the rotation speed of the take-up reel Rotation number detection means, and a sending reel rotation number detecting means for detecting information corresponding to the wave number of a frequency signal proportional to the rotation speed of the sending reel,

[0032]

(Equation 4)

And

[0034]

(Equation 5)

Means for detecting the total winding amount of the tape by using Here, r (t) is the winding diameter of the take-up reel at any time, N (0) is the rotation cycle ratio of the sending reel and take-up reel at the same point, Td is the tape thickness, and n (s) is the above-mentioned arbitrary. Is the number of revolutions of the sending reel obtained by running the tape within a predetermined period from the time point, and n (t) is the number of revolutions of the take-up reel obtained by running the tape within the same period. With this means, even when using a cassette in which the tape is not wound at the beginning or end, regardless of whether the tape is recorded / unrecorded or the type of recording format, it is possible to accurately detect the total winding amount of the tape. Can be improved.

When a tape on which data has been written is used, the total tape winding amount can be detected by using the following means. First, the tape is run with a predetermined value set as the winding diameter of the take-up reel, and the number of tracks traversed by the head while the tape is running is detected using an envelope. 5A and 5B show an example of the detected envelope. If the tape speed is different from the tape speed at the time of normal reproduction, the envelope has a mountain shape, and the number of peaks differs depending on the ratio with the normal speed. The actual tape speed is detected based on the detected number of traversed tracks by the ratio of the tape speed at the time of data recording, and the detected ratio is converted into the ratio of the winding diameter during traveling to the correct winding diameter.

That is, means for setting the winding diameter information of the take-up reel to a predetermined value, means for controlling the rotation of the take-up reel based on the set predetermined value, and means for stably running the tape; Means for changing the speed to a speed different from that at the time of recording; means for detecting that the rotating head has traversed the data track recorded on the tape; means for counting the number of times the data track has been traversed; It can also be realized by means for detecting the winding diameter of the take-up reel. This means that if the tape is run at the same speed as during recording during playback, the rotating head will not cross the data track, but at different tape speeds, the rotating head will cross the data track, and the number will be the tape speed. It corresponds to the error. In this means, the winding diameter of the take-up reel is unknown and a provisional value is set, so the difference between the actual take-up reel winding diameter and the provisional value is the difference in tape speed, and the number of times the track crosses Error occurs. The actual winding diameter is detected based on the number of errors, and the total tape winding amount can be detected.

In this method for detecting the total winding amount of the tape, since the running distance of the tape is very small, the detection can be performed in a short time and the operability can be improved.

Further, the provision of means for recording the detected total tape winding amount on the tape enables the total tape winding amount to be used the next time recording and reproduction are performed using the same tape. This makes it possible to quickly and accurately obtain the total tape winding amount after inserting the cassette.

[0040]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a magnetic tape recording / reproducing apparatus according to the present invention will be described in more detail with reference to embodiments shown in the drawings.

The first embodiment of the magnetic tape recording / reproducing apparatus according to the present invention will be described with reference to FIG. In FIG. 1, 1 is a tape, 2 is a take-up reel, 3 is a take-out reel, 4 is a take-up reel motor, 5 is a take-out reel motor, 6 is a take-up reel FG detector, 7 is a take-out reel FG detector, 8 is a tape start end detector, 9 is a cassette detector, 10 is a take-up reel FG cycle detector, 11 is a send-out reel FG cycle detector, 12 is a total winding amount detector of tape 1, and 13 is a take-up reel winding diameter. Arithmetic unit, 14 is a take-up reel temporary winding diameter storage memory, 15 is a switch,
6 is a take-up reel drive controller, 17 is a total tape winding amount detector 2, and 18 is a total tape winding amount discriminator.

The detector 6 detects an FG signal which is a frequency signal proportional to the rotation speed of the take-up reel, and detects the detected F signal.
The G signal is sent to the detector 10, the detector 12, and the detector 17.
Similarly, the detector 7 detects an FG signal, which is a frequency signal proportional to the rotation speed of the sending reel, and sends the detected FG signal to the detector 11, the detector 12, and the detector 17. The detector 10 detects the cycle of the FG signal of the reel 2 sent from the detector 6 using a high-frequency clock, and sends the obtained FG cycle to the computing unit 13, the controller 16 and the detector 17. Similarly, the detector 11 is the FG of the reel 3 sent from the detector 7.
The signal cycle is detected using a high-frequency clock, and the obtained FG cycle is sent to the arithmetic unit 13 and the detector 17.

The detector 9 detects that the cassette has been inserted, and sends a detection signal to the detector 17. The detector 17 uses the detection signal sent from the detector 9 as a trigger to trigger the detector 10
Then, the cycle ratio of the take-out reel and the take-up reel is calculated from the FG cycle of the take-up reel and the FG cycle of the take-out reel sent from the detector 11. Also, the FGs sent from the detectors 6 and 7 are counted, and the number of FGs on the take-up reel side and the number of FGs on the delivery reel side are counted using the period ratio, the FG number on the take-up reel side,

[0044]

(Equation 4)

And

[0046]

(Equation 5)

Thus, the total winding amount of the tape is calculated, and the calculated total winding amount is sent to the discriminator 18. Here, r (t) is the winding diameter of the take-up reel at any time, N (0) is the rotation cycle ratio of the sending reel and the take-up reel at the same point, Td is the tape thickness, n (s)
Is the number of revolutions of the feed reel obtained by running the tape within a predetermined period from the arbitrary time, and n (t) is the number of rotations of the take-up reel obtained by running the tape within the same period. Here, the detection of the total tape winding amount by the detector 17 requires a considerable amount of tape running in accordance with the required detection accuracy. Accordingly, there may be a case where the start of the tape is detected before the predetermined amount of tape travel is reached. FIG. 4 shows an example of the detection accuracy of the total winding amount of the tape detected by the above method.

The detector 8 detects the beginning of the tape and sends a detection signal to the detector 12. The detector 12 uses the detection signal sent from the detector 8 as a trigger to count the number of FGs sent from the detector 6 and the detector 7 to calculate the total winding amount of the tape. Send to Here, the detection of the total tape winding amount by the detector 12 is possible when the tape has been rewound to the start end.

Then, the discriminator 18 sends the calculation result of the earlier sent out of the total winding amount of the tapes sent from the detectors 12 and 17 to the computing unit 13 and sends a signal indicating the end of the detection of the total winding amount of the tape to the switch 15. Send to

The computing unit 13 calculates the winding diameter of the take-up reel based on the cycles sent from the detectors 10 and 11 and the total winding amount of the tape sent from the discriminator 18, and switches the calculated winding diameter to a switch. Send to 15. The memory 14 sends the winding diameter of the take-up reel to the switch 15 as a predetermined fixed value. The switch 15 sends the winding diameter sent from the memory 14 to the controller 16 before the detection of the total tape winding amount, and sends the winding diameter sent from the computing unit 13 to the controller 16 after the detection of the total tape winding amount. send. The controller 16 detects the actual speed of the tape based on the FG cycle sent from the detector 10 and the winding diameter information of the take-up reel sent from the switch 15 so that the error between the target speed and the actual speed becomes zero. The drive signal is supplied to the take-up reel motor 4.

As described above, by using the cycle ratio information immediately after the cassette is inserted and the rotation speed information of both reels detected by the subsequent tape running, even when the cassette in the middle winding state is inserted, Detects the total winding amount of the tape accurately and without sending the tape to the beginning or end,
A stable tape running can be performed.

In the first embodiment, in the total winding amount calculator, the period ratio of the two reels is determined from the FG period of the sending reel and the FG period of the winding reel sent from the detectors 10 and 11. Although calculated, the present invention is not limited to this. By detecting the number of FGs sent from the detectors 6 and 7 in the same period, the cycle ratio between the sending reel and the take-up reel can be detected, and the same degree of calculation accuracy of the total winding amount of the tape can be obtained.

In the first embodiment, the tape speed control is performed using the winding diameter of the take-up reel calculated based on the total winding amount of the tape. However, the present invention is not limited to this. The same tape speed control can be performed by comparing the information corresponding to the total tape winding amount with the calculation result of the FG cycle information obtained from the take-up reel side and the sending reel side, and feeding back the error amount.

Although the detector 17 uses the equation (4), it is usually n (t) ≫1 and n (s) あ り 1. it is obvious.

Further, in order to perform the operation from the cassette mounting to the calculation of the total tape winding amount in a short time, the tape running speed is adjusted in consideration of the calculation error of the total winding amount accompanying the increase in the tape running amount after the cassette mounting. It is possible to set. In the first embodiment, the total winding amount of the tape can always be detected immediately after the tape runs, but the detection error of the total winding amount also changes with the running amount of the tape. Therefore, by detecting the total winding amount of the tape that gradually becomes higher in accuracy and setting the reel diameter or the tape speed in consideration of the detection error range, it can be performed safely and quickly for a short time without reaching the tape start end. , The operation of detecting the total amount of tape and the operation of rewinding can be performed.

The method for detecting the total tape winding amount of the present invention is not limited to the above method. That is, when a signal has already been recorded on the tape, the total winding amount of the tape can also be detected by changing the tape speed and counting the number of tracks traversed by the rotary head.

A second embodiment of the magnetic tape recording / reproducing apparatus according to the present invention will be described with reference to FIG. In the second embodiment, a part of the first embodiment is changed or added, and therefore, the description will be made focusing on the changed and added elements. 2, 1 is a tape, 2 is a take-up reel, 3 is a take-out reel, 4 is a take-up reel motor, 5 is a take-out reel motor, 6 is a take-up reel FG detector, 7 is a take-out reel FG detector, 8 is Tape start end detector, 9 is a cassette detector, 10 is a take-up reel FG cycle detector, 1
1 is a feed reel FG cycle detector; 12 is a total tape winding amount detector 1; 13 is a take-up reel winding diameter calculator;
Is a take-up reel temporary winding diameter value memory, 15 is a switch, 16 is a take-up reel motor drive controller, 17 is a total tape winding amount detector 2, 18 is a total tape winding amount discriminator, 1
9 is a drum, 20 is a drum FG detector, 21 is a drum rotation speed controller, 22 is a rotating head, 23 is a track crossing detector, and 24 is a crossing track number detector.

The detector 9 detects that the cassette has been inserted, and sends a detection signal to the controller 16 and the controller 21. The controller 16 receives the detection signal sent from the detector 9, the detection signal of the total winding amount of the tape sent from the discriminator 18, and the memory 14.
The tape speed is controlled to be five times the recording speed based on the tentatively set winding diameter of the take-up reel sent from the printer. The tape speed described here is a tape speed when it is assumed that the temporarily set winding diameter matches the actual winding reel winding diameter, and is actually a speed corresponding to an error between the two winding diameters. An error has occurred. The detector 20 detects an FG signal which is a frequency signal proportional to the rotation speed of the drum, and sends the detected FG signal to the controller 21. Controller 21
Is the drum 1 based on the FG signal sent from the detector 20.
9 is controlled to drive at a predetermined rotation speed. The detector 23 detects that the rotary head has crossed the data track on the tape based on the reproduction signal sent from the rotary head 22, and sends a detection signal to the detector 24. The detection signal described here is detected using an envelope detection output (hereinafter, referred to as a reproduction envelope) of the reproduction signal detected by the rotating head. When the rotating head crosses the reverse azimuth data track, the peak value of the reproduction envelope becomes very small, so that it is detected that the peak value of the envelope is lower than a predetermined threshold, and the detection signal is sent to the detector 24. send. FIG. 5 shows a schematic diagram of the scanning direction of the rotary head when the tape speed is set to five times the speed at the time of recording, and the envelope of the reproduced signal detected from the rotary head. The detector 24 counts the number of times the rotary head has crossed the data track on the tape based on the detection signal sent from the detector 23,
The winding diameter of the take-up reel is detected. The difference between the set provisional value and the actual winding diameter of the take-up reel is the difference in tape speed, which is the difference between the number of track crossings that should be detected and the actual number of detections. The actual winding diameter can be detected from the difference in the number of crossings. Detector 2
4 sends the detected winding diameter to the detector 17. The winding diameter detection method used here cannot always be used in response to a change in the winding diameter during recording or reproduction. Therefore, by calculating the total tape winding amount using the detected winding diameter, real-time winding diameter detection using the total tape winding amount becomes possible.

The operation of the other components is the same as in the first embodiment, and will not be described.

As described above, the tape is run at a speed different from that at the time of recording, the ratio of the number of track traversals to be originally detected to the actually detected track traverse number, and the temporarily set take-up reel winding diameter Is used, the actual winding diameter of the take-up reel can be detected, and the total tape winding amount can be detected.

In the second embodiment, the tape speed is set to five times the recording speed, but the present invention is not limited to this. By setting the number to a real number multiple of that at the time of recording, the winding diameter information of the take-up reel can be detected, and the total winding amount of the tape can be obtained.

Further, although the method for detecting the total winding amount of the tape according to the present invention can be used without depending on the arrangement of the heads, FIGS.
In the case of a multi-channel recording / reproducing head as described above, the number of crossing tracks to be detected increases even with a speed deviation of the same ratio as that of the head arrangement shown in FIG. 6, and detection can be performed with higher accuracy. 6, 7, and 8, W is a recording head,
R indicates a reproducing head, and + and-indicate different azimuth angles. The envelope waveforms at the time of reproduction at the normal speed are the same as those shown in FIGS. 6, 7 and 8, but at twice the speed, a chevron-shaped waveform appears. At this time, the number of peaks at which the envelope level detected by one scan of one head is large is 1/2, 1, or 2 in FIGS. 6, 7, and 8, respectively. If the set winding diameter of the take-up reel is equal to the actual winding diameter, a predetermined number of peaks are detected for each head scan. However, if there is an error in the set value of the winding diameter, a speed deviation occurs and the detected peak is detected. Also vary. Since the detection of the number of peaks is performed in units of 1/2, FIGS.
It can be detected at 0%, 25%, 12.5% or more. Similarly 5
When the speed is doubled, in the case of FIGS. 6, 7 and 8,
Eight peaks were detected, and the speed deviations were 20% and 10%, respectively.
%, 5% or more.

In the present invention, it is apparent that the detection accuracy of the winding diameter improves with the number of times of scanning of the head when detecting the envelope.

Further, the same effect can be obtained by using a recording head for detecting the envelope, not limited to the reproducing head.

The method for detecting the total winding amount of the tape of the present invention is not limited to the above method. By recording the total winding amount information of the tape on the tape, the total winding amount of the tape can be accurately obtained in a short time.

A third embodiment of the magnetic tape recording / reproducing apparatus according to the present invention will be described with reference to FIG. Note that the third embodiment is a modification and addition of a part of the first embodiment and the second embodiment. Therefore, the following description will focus on the modified and added elements. In FIG. 3, 1 is a tape, 2 is a take-up reel, 3 is a take-out reel, 4 is a take-up reel motor, 5 is a take-out reel motor, and 6 is a take-up reel F
G detector, 7 is a sending reel FG detector, 10 is a take-up reel FG cycle detector, 11 is a sending reel FG
A period detector, 12 is a total tape winding amount detector, 13 is a take-up reel winding diameter calculator, 14 is a take-up reel temporary winding diameter storage memory, 15 is a switch, and 16 is a take-up reel motor drive controller. , 17 are the total winding amount detectors 2, 1
Reference numeral 8 denotes a tape total winding amount discriminator, 19 denotes a drum, 20 denotes a drum FG detector, 21 denotes a drum rotation speed controller, 22 denotes a rotating head, 25 denotes a recording / reproducing device, and 26 denotes a timer.

The recording / reproducing device 25 recognizes an instruction signal for removing the tape from the external input signal or recognizes that a predetermined time has elapsed after the end of the recording operation from the timer 26, and
The information on the total tape winding amount sent from the discriminator 18 is sent to the rotary head 22. The rotary head 22 records the tape total winding amount information sent from the discriminator 18 on the tape.

When the tape is set in the tape recording / reproducing apparatus of the present invention, the rotary head 22 reads out the total winding amount information on the tape and sends it to the recording / reproducing device 26. The recording / reproducing device 26 sends the total tape winding amount information to the discriminator 18.

The operation of the other components is the same as in the first and second embodiments, and will not be described.

As described above, the tape total winding amount information is recorded on the tape, and when the same tape is used again, the recorded tape total winding amount information is read so that the tape can be accurately and at the start or end of the tape. It is possible to detect the total winding amount of the tape without sending it to the tape and to perform stable tape running.

Further, when the tape total winding amount information is recorded on the tape, if the tape total winding amount information is recorded based on a command for unloading the tape as in the present invention, the tape can be used again when the tape is used again. The total winding amount information can be obtained in a short time. Further, if the tape total winding amount information is recorded after a predetermined lapse after the recording operation, the operability can be improved without restarting the tape or the drum.

[0072]

As described above, according to the present invention, the initial object can be achieved. That is, even when a partially wound tape is used, the total tape winding amount can be detected accurately and in a short time, and stable tape running can be performed.
Therefore, the life of the tape and the reliability of the device can be improved.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating the operation of the present invention.

FIG. 2 is a diagram illustrating the operation of the present invention.

FIG. 3 is a diagram illustrating the operation of the present invention.

FIG. 4 is an example of the effect of the present invention.

FIG. 5 is a diagram illustrating the principle of the present invention.

FIG. 6 is a diagram illustrating the principle of the present invention.

FIG. 7 is a diagram illustrating the principle of the present invention.

FIG. 8 is a diagram illustrating the principle of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Tape 2 ... Take-up reel 3 ... Send-out reel 8 ... Tape start end detector 12 ... Tape total winding amount calculator 1 13 ... Take-up reel winding diameter calculator 14 ... Take-up reel temporary winding diameter value storage memory 17 ... Tape Total winding amount calculator 2 23: Track crossing detector 24: Crossing track number detector

Continued on the front page (72) Inventor Shimitsu Higuchi 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Pref. Hitachi, Ltd. Multimedia System Development Headquarters

Claims (16)

[Claims] 1. A recording / reproducing apparatus for recording information on a magnetic tape or reproducing information from a magnetic tape, comprising: means for driving a tape; and winding means for detecting rotation number information indicating the number of rotations of a take-up reel. Take-up reel rotation number detection means; sending-out reel rotation number detection means for detecting rotation number information indicating the number of rotations of the supply reel; take-up reel rotation cycle detection for detecting information proportional to the rotation cycle of the take-up reel Means, a sending reel rotation cycle detecting means for detecting information proportional to a rotation cycle of the sending reel, an output result of the take-up reel rotation cycle detecting means, an output result of the sending reel rotation cycle detecting means, Based on the output result of the take-up reel rotation number detecting means and the output result of the sending reel rotation number detecting means, First tape total winding amount detecting means for detecting information corresponding to the sum of the axially projected areas of the tape wound around the take-up reel and the sending reel and the reel hub; and the first tape total winding amount detecting means. Characterized in that it has a first tape speed control means for controlling a tape speed based on an output result of the take-up reel rotation cycle detection means and an output result of the take-out reel rotation cycle detection means. Tape recording and playback device. 2. A recording / reproducing apparatus for recording information on a magnetic tape or reproducing information from a magnetic tape, comprising: means for driving a tape; and winding means for detecting rotation number information indicating the number of rotations of a take-up reel. Take-up reel rotation number detection means; sending-out reel rotation number detection means for detecting rotation number information indicating the number of rotations of the supply reel; take-up reel rotation cycle detection for detecting information proportional to the rotation cycle of the take-up reel Means, a sending reel rotation cycle detecting means for detecting information proportional to a rotation cycle of the sending reel, an output result of the take-up reel rotation cycle detecting means, an output result of the sending reel rotation cycle detecting means, Based on the output result of the take-up reel rotation number detecting means and the output result of the sending reel rotation number detecting means, First tape total winding amount detecting means for detecting information corresponding to the sum of the axially projected area of the tape wound around the take-up reel and the delivery reel and the reel hub; and a hub for the take-up reel or the delivery reel. Diameter, the output result of the take-up reel rotation number detecting means,
A second tape total winding amount detecting means for detecting a total tape winding amount based on an output result of the sending reel rotation number detecting means; an output result of the first tape total winding amount detecting means; Selecting means for selecting any one of the output results of the amount detecting means and setting the total tape winding amount; selecting output from the selecting means; output result of the take-up reel rotation cycle detecting means; A magnetic tape recording / reproducing apparatus, comprising: a second tape speed control means for controlling a tape speed based on an output result of the detection means. 3. The first tape total winding amount detection means includes a rotation cycle ratio detection means for detecting information corresponding to a rotation cycle ratio of the sending reel and the take-up reel at an arbitrary time, The tape is run from the arbitrary time, the output result of the sending reel rotation number detecting means for a predetermined period from the start of running, the output result of the take-up reel rotation number detecting means for a predetermined period from the start of running, 3. The magnetic tape recording / reproducing apparatus according to claim 1, wherein the total tape winding amount is detected based on an output result of the rotation period ratio detecting means. 4. The first tape total winding amount detecting means includes: r (t): a winding radius of a take-up reel at an arbitrary time; N (0): a winding radius of a take-out reel and a take-up reel at an arbitrary time. Rotation cycle ratio, Td: thickness of tape, n (s): number of revolutions of the sending reel obtained by running the tape for a predetermined period from the above-mentioned arbitrary point, n (t): tape running for a predetermined period from the above-mentioned arbitrary point When the number of rotations of the take-up reel is obtained as follows, S: the total winding amount of the tape, And The magnetic tape recording / reproducing apparatus according to any one of claims 1 to 3, wherein the total tape winding amount is detected by using (1). 5. The first tape speed control means includes an output result of the take-up reel rotation cycle detection means, an output result of the sending reel rotation cycle detection means, and a first tape total winding amount detection means. First winding diameter detecting means for detecting a winding diameter of the take-up reel, which is a winding radius of the tape wound on the take-up reel, based on the first and second winding reel detecting means And the output of
The tape speed is controlled based on an output result of the take-up reel rotation period detecting means.
6. A magnetic tape recording / reproducing apparatus according to claim 1. 6. The second tape speed control means includes an output result of the take-up reel rotation cycle detection means, an output result of the delivery reel rotation cycle detection means, and a first tape total winding amount detection means. And second winding diameter detection means for detecting the winding diameter of the take-up reel based on one of the second tape total winding amount detection means, wherein the second winding reel winding diameter detection Output results of the means,
3. The tape speed is controlled based on an output result of the take-up reel rotation period detecting means.
The magnetic tape recording / reproducing apparatus according to claim 4. 7. The apparatus according to claim 1, further comprising means for setting the winding diameter information of said take-up reel to a predetermined value, and first tape running control means for stably running the tape based on said predetermined value. A magnetic tape recording / reproducing apparatus according to any one of claims 1 to 6. 8. A recording / reproducing apparatus for recording information on a magnetic tape or reproducing information from a magnetic tape, comprising: means for driving a tape; and winding means for detecting information proportional to a rotation cycle of the take-up reel. Reel rotation cycle detection means, delivery reel rotation cycle detection means for detecting information proportional to the rotation cycle of the delivery reel, means for setting winding diameter information of the take-up reel to a predetermined value, based on the predetermined value First tape running control means for causing the tape to run stably, a rotary head for reproducing information recorded on the tape, a control means for driving the rotary head at a predetermined rotation speed, and output from the rotary head. Third winding diameter detecting means for detecting an actual winding diameter of the take-up reel based on the reproduction signal and the set value; Third tape total winding amount detecting means for detecting the total tape winding amount, and third tape speed controlling means for controlling the tape speed based on the output result of the third tape total winding amount detecting means. A magnetic tape recording / reproducing device characterized by the above-mentioned. 9. A recording / reproducing apparatus for recording information on a magnetic tape or reproducing information from a magnetic tape, comprising: means for driving a tape; and winding means for detecting information proportional to a rotation cycle of the take-up reel. Reel rotation cycle detection means, delivery reel rotation cycle detection means for detecting information proportional to the rotation cycle of the delivery reel, means for setting winding diameter information of the take-up reel to a predetermined value, based on the predetermined value First tape running control means for causing the tape to run stably, a rotary head for reproducing information recorded on the tape, a control means for driving the rotary head at a predetermined rotation speed, and output from the rotary head. Third winding diameter detecting means for detecting the actual winding diameter of the take-up reel based on the reproduction signal and the set value; A third tape total winding amount detecting means for detecting the total winding amount of the tape, a winding reel rotation number detecting means for detecting rotation number information indicating the number of rotations of the winding reel, and a number of rotations of the sending reel. Sending reel rotation number detecting means for detecting certain rotation number information; hub diameter of the take-up reel or the sending reel; output result of the winding reel rotation number detecting means; and output of the sending reel rotation number detecting means. Second tape total winding amount detecting means for detecting the total tape winding amount based on the result, and any one of an output result of the third tape total winding amount detecting means and an output result of the second total winding amount detecting means. Selection means for selecting one of them to set the total tape winding amount, a selection output from the selection means, an output result of the take-up reel rotation cycle detection means, and a delivery reel rotation cycle detection means. Magnetic tape recording and reproducing apparatus characterized by having a fourth tape speed control means for controlling the tape speed based output and the. 10. The third winding diameter detecting means includes means for detecting that the rotary head has traversed a data track recorded on a tape, and the third winding diameter detecting means based on an output result of the means for detecting traversing. 9. The device according to claim 8, further comprising: means for counting the number of times the rotating head has traversed the data track, wherein the counting means detects the winding diameter of the take-up reel based on the set value. 10. The magnetic tape recording and reproducing apparatus according to 9. 11. The third tape speed control means includes an output result of the take-up reel rotation cycle detection means, an output result of the sending reel rotation cycle detection means, and a third tape total winding amount detection means. A fourth winding diameter detecting means for detecting a winding diameter of the take-up reel based on the output result of the fourth winding reel winding diameter detecting means,
9. The tape speed is controlled based on an output result of the take-up reel rotation period detecting means.
6. A magnetic tape recording / reproducing apparatus according to claim 1. 12. The fourth tape speed control means includes an output result of the take-up reel rotation cycle detection means, an output result of the sending reel rotation cycle detection means, and a third tape total winding amount detection means. And fifth winding diameter detecting means for detecting the winding diameter of the take-up reel based on one of the second tape total winding amount detecting means, wherein the fifth winding reel winding diameter detection Output results of the means,
10. The tape speed is controlled based on an output result of the take-up reel rotation period detecting means.
The magnetic tape recording / reproducing apparatus according to claim 10. 13. A recording rotary head for recording information on a tape, wherein a predetermined signal is used as a trigger to record information corresponding to the detected total tape winding amount on the tape by the recording rotary head. 13. The magnetic tape recording / reproducing apparatus according to claim 1, wherein: 14. The predetermined signal is a signal corresponding to a cycle in which the recording rotary head records one track, and the signal is used as a trigger to record information corresponding to a total tape winding amount in all tracks. 14. The magnetic tape recording / reproducing apparatus according to claim 13, wherein: 15. The apparatus according to claim 13, wherein the predetermined signal is a command signal for removing a tape from the apparatus.
A magnetic tape recording / reproducing apparatus as described in the above. 16. The magnetic tape recording / reproducing apparatus according to claim 13, wherein said predetermined signal is a signal generated after a lapse of a predetermined time from the end of recording.