JP3538587B2 - Magnetic recording / reproducing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording / reproducing apparatus such as a video tape recorder, and more particularly to a magnetic recording / reproducing apparatus capable of high-speed winding by fast-forward or rewind.

[0002]

2. Description of the Related Art Generally, in a video tape recorder, when a tape is wound at a high speed such as in a fast-forward mode or a rewind mode, air may be simultaneously wound at the same time as the tape is wound. The amount of entrained air depends on the surface roughness of the tape surface,
For example, although affected by the degree of pain, the characteristics of the tape cassette, and the like, the amount of air taken in when winding at a high speed is larger than when winding in a low-speed playback mode. If the amount of air is large, the winding of the tape becomes loose.

Here, when high-speed winding is performed, deceleration is performed stepwise at an optimum point in accordance with the state of the tape or the winding state, thereby preventing rapid deceleration and decelerating according to the tape end. And fast and safe high-speed winding can be realized. This deceleration point is
It is set based on the total area of the tape and the respective reel areas of the supply reel and the take-up reel around which the tape is wound. If the setting of the deceleration point does not correspond to the winding state of the tape, the tape cannot be decelerated even when the tape end approaches, and the tape may be damaged by sudden braking or the like. Or if you slow down early,
The winding time becomes longer.

[0004] Each area is calculated from the number of rotations of the reel. However, when the tape is loosely wound around each reel hub in the cassette, the tape tightening that causes slippage of the tape when feeding or winding the tape. May occur. In this case, the relationship between the rotation of the reel hub that rotates integrally with the reel and the tape feed or take-up amount becomes unstable, and an accurate area cannot be calculated.

[0005] The reel is provided with blades for engaging with the reel hub of the cassette and transmitting the rotation of the reel to the reel hub. However, when the reel is engaged with the reel hub in the cassette when the engaging portion of the reel hub rides on the blade or when the blade has a shaping defect, etc. The relationship between the rotation of the tape and the amount of tape feeding or winding becomes unstable, and an accurate area cannot be calculated.

Further, means for detecting the rotation of the reel include:
A rotation detecting means using an optical sensor such as a photo interrupter is used. For example, in the transmission type optical sensor shown in FIG. 11, the light emitting unit 20 and the light receiving unit 21 are arranged to face each other,
A plurality of light-shielding portions 23 are formed at equal intervals on the reel 22 or a member that rotates in cooperation with the reel 22. As the reel 22 rotates, the light-shielding portion 23 passes between the light-emitting portion 20 and the light-receiving portion 21, so that the light emitted from the light-emitting portion 20 is transmitted to the light-receiving portion 21 or shielded from the light. The light to 21 is turned on and off, and the output voltage from the optical sensor fluctuates according to the rotation of the reel 22. In the reflection type optical sensor shown in FIG.
Reflecting portions 24 and non-reflecting portions having a lower reflectance than the reflecting portions 24 are alternately formed on the member that rotates in coordination with the light emitting portion 24. The light emitting portion 20 and the light receiving portion 21 of the optical sensor are disposed opposite to the reflecting portions 24.
When the reel 22 rotates, the light emitted from the light emitting unit 20 is reflected, and the intensity of the light incident on the light receiving unit 21 changes.
The output voltage from the optical sensor changes according to the rotation of the reel 22.

If the shading portion, the reflecting portion, and the non-reflecting portion have a molding defect or a variation in reflectance, the reel rotation speed is not accurately detected, and an accurate area cannot be calculated.

As described above, when the area is not calculated normally, the deceleration point deviates from the optimum point, and the tape end is not decelerated as described above, or the winding time is extended.

In view of the above, the present invention provides an accurate total area and reel area so that an appropriate deceleration point can be set according to the tape winding state when winding the tape at a high speed. It is an object of the present invention to provide a magnetic recording / reproducing device that can be calculated.

[0010]

The object of the present invention is to measure the rotation of a supply reel and a take-up reel, respectively, and to accelerate and decelerate the tape in a fast-forward mode or a rewind mode based on the output data. When setting the conditions, the rotation fluctuation of the supply reel or the take-up reel due to looseness of the tape, unstable engagement between each reel and the reel hub in the cassette, or abnormality of the rotation detection means provided on each reel is detected. When the reel rotation fluctuation is detected, the tape running conditions are set again. Further, when periodicity is recognized in the rotation fluctuation of the reel, this is notified by a display or the like, and the high-speed winding speed is set to a low speed.

Here, in order to set the running conditions of the tape, reel rotation detecting means for measuring the number of rotations of the supply reel and the take-up reel respectively, and the total number of tapes based on the number of rotations of each reel detected by the detecting means. There is provided a calculating means for calculating the area and each reel area, and setting the running condition of the tape in the fast-forward mode or the rewind mode based on the area data.

As means for detecting the rotation fluctuation of the reel, for example, the rotation period of the reel detected this time may be compared with the rotation period detected last time. When the rotation fluctuation occurs, a change appears in the rotation period. , Rotation fluctuations can be detected.

As described above, when the rotation fluctuation occurs on the reel due to looseness of the tape or the like, when this is detected, each area calculated from the data of the abnormal rotation speed is discarded, and the area is calculated again. In this case, since the number of rotations of the reel is detected after the tightness of the tape is stopped, each area can be accurately calculated based on the normal number of rotations of the reel.

In addition, if the rotation fluctuation has periodicity, it is detected by the period detecting means. If the rotation fluctuation has a periodicity, for example, due to a reel rotation fluctuation due to a molding failure of the light shielding portion provided on the reel. Therefore, it can be determined that the rotation fluctuation cannot be removed. In such a case, the high-speed winding speed is set to a low speed, and a notification to that effect is made on a display or the like to prevent erroneous entry into the high-speed operation.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, a magnetic recording / reproducing apparatus according to an embodiment of the present invention comprises a supply reel 2 for supplying a tape 1 and a take-up reel 3 for rewinding.
And a drive motor 4 for rotating the drive 3. Then, as shown in FIG.
The reel hubs 6 of the cassette 5 are engaged with the reels 3, respectively, and a high torque driving force is selectively transmitted to the reels 2 and 3 from the driving motor 4 via a transmission mechanism such as a pulley or a belt in accordance with the traveling direction. , High-speed winding is performed. It should be noted that the supply reel 2 depends on the fast-forward mode and the rewind mode.
Alternatively, the drive transmission to the take-up reel 3 is switched. Further, a driving mechanism for moving the pinch roller 8 close to and away from the capstan 7 is provided, and the driving force from the driving motor 4 is also transmitted to the capstan 7. Further, as shown in FIG. 3, when the pinch roller 8 is set in a state of being close to the capstan 7, the tape 1 is sandwiched between the pinch roller 8 and the capstan 7, and the tape is fed at a constant speed. . In the figure, 9 is a cylinder, and 10 is a guide pin.

A control unit 11 for controlling the driving of the drive motor 4 in accordance with each of the running modes of reproduction, recording, fast-forward reproduction, rewind reproduction, fast-forward, and rewind is provided. Based on this, the motor driver 12 drives the drive motor 4 at a predetermined rotation speed. The rotation speed of the drive motor 4 is detected by a rotation detector 13.
As the rotation detector 13, for example, a frequency generator (FG)
Is used to generate a frequency signal corresponding to the number of revolutions,
Output to the control unit 11. Further, a reel rotation detector 14 for detecting the number of rotations of each of the reels 2 and 3 is provided. As the reel rotation detector 14, a rotation sensor such as an optical sensor that generates a pulse in accordance with the rotation of the reels 2 and 3 is used, and the number of rotations of the reels 2 and 3 is obtained by counting the reel pulses. For example, if the reels 2 and 3 make one rotation, the number of pulses becomes six.

A control unit 11 composed of a microcomputer
Then, the output voltage to the drive motor 4 is controlled so that the traveling speed corresponds to the input mode. In particular, in the fast-forward mode or the rewind mode, the drive motor 4 must be rotated at a high speed in order to make the tape 1 run at a high speed.

That is, as shown in FIG. 4, a low voltage is supplied to the drive motor 4, and when the rotation speed of the drive motor 4 becomes equal to or higher than the first reference value, the drive motor 4 is switched to a high voltage. When the drive motor 4 reaches the maximum rotation speed, the drive motor 4 is controlled to rotate at a constant speed while maintaining the rotation speed. During this time, the running speed of the tape 1 continues to increase. When the running speed reaches a certain running speed, the drive motor 4 is controlled so as to maintain the running speed, and the rotation speed of the drive motor 4 is gradually reduced. Thereafter, when the number of rotations of the supply reel 2 reaches a certain number of rotations, the drive motor 4 is controlled so as to maintain the constant number of rotations, and the number of rotations of the drive motor 4 is further reduced. When the number of revolutions of the drive motor 4 decreases to a preset number of revolutions, the output voltage to the drive motor 4 is switched from a high voltage to a low voltage. When the number of revolutions of the drive motor 4 decreases to a preset number of revolutions, the number of revolutions is maintained, and when the supply side area reaches a certain value, the second deceleration is started. Thereafter, when the rotation speed of the drive motor 4 decreases to a predetermined rotation speed, the third deceleration is started. When the rotation speed reaches a predetermined rotation speed, the rotation is continued. Then, the output to the drive motor 4 is set to 0, and the brake is applied to stop.

As described above, by accelerating and decelerating stepwise, winding in accordance with the winding state of the tape 1 can be executed, time for fast-forwarding or rewinding can be shortened, and high-speed winding can be realized. Here, the acceleration condition and the deceleration point during high-speed winding are set based on the total area of the tape 1 and the area of each reel.

For this reason, the control unit 11 controls the reels 2 and
The total area of the tape 1 is calculated from the number of rotations of 3, and then the area of each reel is calculated to set acceleration conditions and deceleration points. The total area of the tape 1 is the sum of the hub area of the two reels 2 and 3 projected on a plane and the area of the tape 1, and the reel area is the hub area of each reel 2 and 3 and the area of the hub. Wound tape 1
And the sum of both reel areas is the total area.

If the total area or the reel area is not calculated normally, the deceleration point will deviate from the optimum point. Therefore, the control unit 11 detects the fluctuation of the rotation of the reels 2 and 3 and It has a function of recalculating the area when the rotation fluctuates. This reel 2,
As means for detecting the rotation fluctuation of the reel 3, the cycle of one pulse is obtained by using a reel pulse generated by the rotation of the reels 2 and 3, and is compared with the previously obtained cycle. As a result of the comparison, when the difference is larger than the threshold value, it is determined that the rotation has varied.

The specific operation of the fast-forward or rewind mode will be described with reference to FIGS. By inputting the instruction key to start high-speed winding,
The control unit 5 checks whether the calculation of the total area has already been obtained. If the total area has not been calculated, the operation proceeds to the total area calculation operation. Move to return operation.

When the total area has not been calculated, the state of the drive mechanism is shifted to a state in which the pinch roller 8 and the capstan 7 cooperate to feed the tape 1, and then the drive motor 4 is rotated at a substantially constant speed, and the reel 2 is rotated. The tape 1 is run slowly while turning 3. The first reel pulse rises by the rotation of the reels 2 and 3, and when this is detected, the capture of the reel pulse and the frequency signal is started. Since the running of the tape 1 is not stable immediately after the start of the rotation, an abnormal reel pulse results. Therefore, after counting the first reel pulse, data taken in during a certain period of time, for example, two seconds or one rotation of the reels 2 and 3 is ignored.

After a predetermined time has elapsed, calculation of the total area of the tape 1 is started. That is, the number of rotations is calculated from the count number of the reel pulse, the tape feed amount at this time is obtained from the count value of the frequency signal, and the radius of the reels 2 and 3 is obtained from the number of rotations and the tape feed amount. 3 or the total area is calculated, or each reel 2,
The circumference at 3 is obtained from the count value of the frequency signal and the reference tape speed, and the total area is calculated.

After calculating the total area by the above method, or when the total area has already been obtained, the driving mechanism is shifted to a state in which high-speed winding is possible, and the driving mechanism is shifted according to the rotation ratio of each of the reels 2 and 3. The operation for calculating each reel area by dividing the total area is started. For example, after setting the state of the drive mechanism, the drive motor 4 is rotated at a substantially constant speed, and the tape 1 is run slowly while rotating the reels 2 and 3. Reel 2,
The first reel pulse rises by the rotation of No. 3, and when this is detected, the capture of the reel pulse and the frequency signal is started. Since the running of the tape 1 is not stable immediately after the start of the rotation, an abnormal reel pulse results. Therefore, after counting the first reel pulse, data captured for a certain period of time, for example, one second or while the reels 2 and 3 make one rotation is ignored. After the lapse of the predetermined time, the rotation ratio is calculated based on the count value of the frequency signal while the predetermined number of reel pulses are counted on each of the reels 2 and 3, and the area of each reel is calculated.

During the high-speed winding operation, the reel pulses are always counted, the rotation ratio of each reel 2, 3 is obtained, and the area of each reel is calculated.

While counting the reel pulses to calculate the total area or the reel area, the cycle of one pulse is measured at the same time, and the current reel pulse cycle is compared with the reel pulse cycle one pulse before. It is determined whether or not the reel pulse is disturbed. That is, when the difference | TS0−TS1 | between the previous reel pulse TS0 of the supply reel 2 and the current reel pulse TS1 is larger than the threshold value A,
This means that the cycle of the reel pulse fluctuates suddenly, and the rotation fluctuation of the reels 2, 3 can be detected. In such a case, since the rotation of the reels 2 and 3 is not stable due to the looseness of the tape 1 or the like, when the area is calculated, the area is not normal. Therefore, the deceleration point set based on this deviates from the optimal point.

Therefore, the total area or the reel area is recalculated, and the fluctuation of the cycle of the reel pulse is checked again. Similarly, in the take-up reel 3, it is compared whether the difference | TT0−TT1 | between the previous reel pulse TT0 and the current reel pulse TT1 is larger than the threshold value A. If the difference between them is large, the total area or the reel area is recalculated, and the fluctuation of the cycle of the reel pulse is checked again. If there is no rotation fluctuation in both reels 2 and 3,
The calculation of the area ends. By repeatedly calculating the area as described above, the tightening of the tape 1 can be stopped, and each area can be calculated based on the number of rotations measured in a state where the rotation of the reels 2 and 3 is stable. It becomes possible.

After calculating the total area and the reel area as described above, the optimum acceleration condition and the deceleration point according to the winding state of the tape 1 are set.
To increase the output and start accelerating. Drive motor 4
When the number of rotations of the motor is equal to or more than the first reference value (1000 rpm) as an actually measured value, that is, the FG cycle obtained by the rotation detector 7 is equal to or less than 0.166 msec, the output voltage to the drive motor 4 is reduced to a low voltage (12 V) To high voltage (23V). The running speed of the tape 1 is gradually accelerated. Further, when the rotation speed of the drive motor 4 increases and becomes equal to or more than a second reference value (2000 rpm) set in advance, the control unit 5 activates the timer for a certain period of time, in this case, 2 seconds. Turn on the heavy flag.

When the drive motor 4 reaches the maximum number of revolutions, it is driven for a while while being kept constant at the number of revolutions.
Wind the tape 1 at high speed. As the running speed of the tape 1 increases as the tape 1 is wound up,
The rotation speed of the drive motor 4 is gradually reduced so that the running speed of the tape 1 becomes constant. When the tape 1 is further wound, the rotation of the supply reel 2 becomes too fast. Therefore, the rotation speed of the drive motor 4 is further reduced so that the rotation speed of the supply reel 3 becomes constant. At this time, the rotation speed of the drive motor 4 is set to a reference value (2000 rpm).
m) When it becomes less than or equal to, the output voltage to the drive motor 4 is switched from the high voltage to the low voltage, and the load heavy flag is turned off. As a result, the rotation speed of the drive motor 4 sharply decreases, and the first-stage deceleration is performed.

When the reel area corresponding to the tape winding amount of the take-up reel 3 reaches a preset value, the drive motor 4 is controlled so as to further reduce the rotation speed, and the second stage deceleration is performed. Is performed. Further, the drive motor 4
When the number of revolutions becomes equal to or less than a preset reference value (500 rpm), the third-stage deceleration for rotating the drive motor 4 at low speed is performed. Due to the stepwise deceleration, the running speed of the tape 1 decreases while the tension of the tape 1 is kept substantially constant, and the winding of the tape 1 is stopped when the tape end is detected.

Therefore, by accelerating under the optimal conditions and gradually decelerating at the optimal point, it is possible to prevent abrupt deceleration and decelerate according to the tape end, and to keep the tape 1 tension constant. The tape 1 can be wound up, preventing the tape 1 from sagging,
In addition, the winding can be completed without a sudden stop, and the tape 1 and the mechanical parts are not damaged, so that safe winding can be achieved.

When the winding load of the tape 1 increases for some reason during high-speed winding, the drive motor 4
, And the rotation of the drive motor 4 decreases. When this decrease in the number of revolutions is detected, the output voltage to the drive motor 4 is switched from the high voltage of 23 V to the low voltage of 12 V, and the load heavy flag is turned off. Thereafter, the drive motor 4 is driven with this output voltage to take up the tape 1. Even during this winding, by performing the above-described stepwise deceleration, the tape 1
Can be wound up.

Next, an embodiment in the acceleration mode during the high-speed winding operation after the calculation of the total area will be described with reference to FIGS. By inputting an instruction key for starting high-speed winding, the control unit 11 checks whether the total area has already been obtained. If the total area has not been obtained, the total area is obtained by the above-described method. If the total area is obtained, the drive mechanism is immediately shifted to a state in which high-speed winding can be performed. The operation for calculating each reel area from the rotation ratio is started. For example, after setting the state of the drive mechanism, the drive motor 4 is rotated at a substantially constant speed, and the tape 1 is run slowly while rotating the reels 2 and 3. The first reel pulse rises by the rotation of the reels 2 and 3, and when this is detected, the capture of the reel pulse and the frequency signal is started. Since the running of the tape 1 is not stable immediately after the start of the rotation, an abnormal reel pulse results. Therefore, after counting the first reel pulse, a certain period of time, for example, one second or the reels 2 and 3
Ignore the data captured during rotation. After the lapse of the predetermined time, the rotation ratio is calculated based on the count value of the frequency signal while the predetermined number of reel pulses are counted on each of the reels 2 and 3, and the area of each reel is calculated.

In the high-speed winding operation, the drive motor 4
According to the area determined while rotating the tape at a substantially constant speed, the optimum acceleration condition according to the state of the tape 1 can be set, so that the tape can be set to be accelerated more safely. For example, at the time of fast-forwarding, when it is detected that the state of the tape 1 is the winding start (start end) from the respective reel areas obtained by rotating the drive motor 4 at a substantially constant speed as described above, the drive motor 4 is short-circuited. Control unit 5 in the rapid acceleration mode that rises to the maximum speed in time
Is controlled by

Conversely, when it is detected that the state of the tape 1 is the end of winding (end) from the respective reel areas determined by rotating the drive motor 4 at a substantially constant speed as described above, the drive motor 4 Is controlled by the control unit 5 so as to accelerate slowly.

In this acceleration section, the tension of the tape 1 becomes larger than in other states, and in the tape 1 whose winding around the reel hub 6 is loose, it was not possible to detect the tape 1 in other modes without much noticeable tightening. However, in this acceleration section, there is a case where a large tightening of the winding occurs and this is detected. Therefore, especially when the difference between the counts of the reel pulses in the acceleration section exceeds the threshold value, the acceleration operation is stopped, the tape feeding is temporarily stopped, and the high-speed winding operation is started again.

That is, when the motor starts up in the rapid acceleration mode despite the end of the tape at the time of fast forward, or when it starts up in the rapid acceleration mode despite the start of the tape at the time of rewinding, the drive motor 4 Is stopped, and the reels 2 and 3 are stopped by applying a braking force, thereby preventing the tape 1 from being rushed into the end or start end of the tape 1 at a high speed and damaging the tape 1. Further, the high-speed winding operation can be safely performed without the user performing the operation of starting the high-speed winding again.

Further, as another embodiment, a photo interrupter, which is an optical sensor, is used for the reel rotation detector 14. As the photo interrupter, there is a transmission type photo interrupter shown in FIG. 11 or a reflection type photo interrupter shown in FIG. Here, a transmission type optical sensor is used.

In this optical sensor, the light emitting section 20 and the light receiving section 2
1 and a plurality of light shielding units 23 provided on the reels 2 and 3
And the light to the light receiving unit 21 is turned on and off, so that the voltage generated from the light receiving unit 21 fluctuates, and the rotation of the reels 2 and 3 is detected.

Here, when the reels 2 and 3 are molded products made of plastic or the like, the molding color is set to black so that the light shielding is completely performed. However, a part of the light shielding portion 23 becomes uneven in molding color due to molding failure or the like,
If the light shielding part 23 is not formed in a predetermined shape,
Shading is incomplete. Then, the count of the reel pulse decreases, and accurate reel rotation cannot be detected, and the area calculated based on this becomes very large, so that accurate acceleration conditions and deceleration points cannot be set accurately.

Therefore, when the fluctuation of the reel pulse is detected by the output from the optical sensor at the time of calculating the total area, the calculation is performed again and it is detected whether the fluctuation of the reel pulse is a periodic fluctuation. By outputting a reel pulse waveform as shown in FIG. 10, it is possible to detect that the rotation fluctuation of the reels 2 and 3 is periodic. An error message indicating that the reel molding is defective is displayed. In addition,
If there is no display unit, the LED for power display is blinked, or the notification is performed by another method such as sound or buzzer.

Also, as shown in FIG. 9, at the time of calculating each reel area, similarly, it is determined whether or not the rotation fluctuation of the reels 2 and 3 is periodic. The winding operation is stopped, and the total area is calculated again. When the vehicle is not accelerating, the reel pulse counting is started again, and the reel area is calculated.

It should be noted that the present invention is not limited to the above-described embodiment, and it goes without saying that many modifications and changes can be made to the above-described embodiment within the scope of the present invention. For example, instead of detecting the rotation fluctuation of the reel from the cycle of the reel pulse, a pulse signal may be generated in synchronization with the running of the tape, and the rotation fluctuation of the reel may be detected by detecting the pulse signal.

[0045]

As is clear from the above description, according to the present invention, when the winding of the tape is loose, the winding of the tape is tightened during the rotation of the reel, and the rotation of the reel is not stabilized. If the rotation of the reel is not stable due to poor engagement, this can be detected from fluctuations in the rotation cycle of the reel. Therefore, when calculating the total area of the tape or the reel area based on the rotation speed of the reel, it is possible to exclude abnormal data and calculate each area with accurate data. Therefore, the optimal deceleration point in high-speed winding can be set based on each area calculated normally, and the deceleration is performed stepwise at the optimal point in accordance with the state of the tape and the winding state, resulting in rapid deceleration. Can be prevented and the speed can be reduced according to the tape end, and fast and safe high-speed winding can be realized.

Also, when the rotation is not stable due to defective molding of the reel, the high-speed take-up is set to a low speed, and the fact that the defective reel is defective is indicated by a display or the like. Can be found and the rejection of defective products to the market can be prevented.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a tape drive device according to an embodiment of the present invention.

FIG. 2 is a schematic configuration diagram of a tape driving device in a high-speed winding state.

FIG. 3 is a schematic configuration diagram of a tape driving device at the time of constant-speed tape feeding.

FIG. 4 is a diagram showing timing of acceleration / deceleration of a drive motor during high-speed winding.

FIG. 5 is a flowchart of area calculation.

FIG. 6 is a flowchart of rotation fluctuation detection when calculating the total area.

FIG. 7 is a flowchart of rotation fluctuation detection at the time of reel area calculation.

FIG. 8 is a flowchart for detecting the periodicity of rotation fluctuation when calculating the total area.

FIG. 9 is a flowchart for detecting periodicity of rotation fluctuation at the time of reel area calculation.

FIG. 10A shows a normal reel pulse waveform.
(B) A diagram showing a reel pulse waveform when there is periodic rotation fluctuation.

FIG. 11 is a diagram showing a transmission type optical sensor used for a reel rotation detector.

FIG. 12 is a diagram showing a reflection type optical sensor used for a reel rotation detector.

[Explanation of symbols]

1 tape 2 Supply reel 3 Take-up reel 4 Drive motor 11 Control unit 13 Rotation detector 14 Reel rotation detector

Continuation of front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G11B 15/48 G11B 15/46

Claims (8)

(57) [Claims] 1. A supply reel for feeding a tape, a take-up reel for winding the tape, a motor for rotating the take-up reel, and a reel rotation detector for measuring rotations of the supply reel and the take-up reel, respectively. Means and the total area of the tape from the rotation of each reel detected by the detecting means
And calculates the reels area, the tape for detection and calculation means for setting the tape running condition in the fast forward mode or rewind mode on the basis of these area data, the rotational fluctuation of the previous SL supply reel or the take-up reel When detecting rotation fluctuations of the reel, the calculating means discards the calculated areas and re-records the data.
A magnetic recording / reproducing apparatus for recalculating a total area of a tape and a tape area . 2. When the fluctuation of the rotation of the supply reel or the take-up reel is detected during the calculation of the total area, there is provided a period detecting means for detecting whether the fluctuation has periodicity, and the period detecting means has periodicity. 2. The magnetic recording / reproducing apparatus according to claim 1, wherein the tape feed speed in the fast-forward mode or the rewind mode is set to a low speed when it is determined. 3. A cycle detecting means for detecting whether or not the rotation of the supply reel or the take-up reel has a periodicity when the fluctuation of the rotation of the supply reel or the take-up reel is detected during the calculation of the total area. 2. The magnetic recording / reproducing apparatus according to claim 1, further comprising: a notifying means for notifying the user when the judgment is made. 4. A tape feed in a fast-forward mode or a rewind mode is stopped when rotation fluctuation of a supply reel or a take-up reel is detected during acceleration in a fast-forward mode or a rewind mode. The magnetic recording / reproducing apparatus according to claim 1. 5. When accelerating in a fast-forward mode or a rewind mode, when a rotation fluctuation of a supply reel or a take-up reel is detected, the tape feeding in the fast-forward mode or the rewind mode is stopped, and the fast-forward mode or the rewind mode is restarted. magnetic recording and reproducing apparatus according to any one of claims 1-3, characterized in that automatically rewind mode. 6. A supply reel for feeding a tape, and a tape.
Take-up reel, and the take-up reel is driven to rotate.
Motor for rotating the supply reel and the take-up reel.
Reel rotation detecting means for measuring the rotation of each of the reels;
Total area of tape from rotation of each reel detected by step
And the area of each reel are calculated, and these area data
In fast forward or rewind mode based on
Calculating means for setting the running conditions of the tape to be supplied;
Tape that detects fluctuations in the rotation of the reel or take-up reel
Detecting means and supply reel or take-up reel during total area calculation
When a change in the rotation of the roller is detected, the change
Cycle detecting means for detecting whether the
Fast-forward mode when the detection means determines that there is periodicity
Alternatively, set the tape feed speed in rewind mode to low.
A magnetic recording and reproducing apparatus. 7. A supply reel for feeding a tape, and a tape.
Take-up reel, and the take-up reel is driven to rotate.
Motor for rotating the supply reel and the take-up reel.
Reel rotation detecting means for measuring the rotation of each of the reels;
Total area of tape from rotation of each reel detected by step
And the area of each reel are calculated, and these area data
In fast forward or rewind mode based on
Calculating means for setting the running conditions of the tape to be supplied;
Tape that detects fluctuations in the rotation of the reel or take-up reel
Detecting means and supply reel or take-up reel during total area calculation
When a change in the rotation of the roller is detected, the change
Period detecting means for detecting whether the
When the stage determines that there is periodicity, this is reported.
A magnetic recording / reproducing apparatus comprising: a notifying unit. 8. A tape winding detecting means for detecting a supply detected this time.
The rotation cycle of the reel or take-up reel and the previously detected rotation
The rotation cycle of each reel can be detected by comparing with the rotation cycle.
The magnetic recording device according to any one of claims 1 to 7, wherein
Recording and playback device.