JPH1145473A - Magnetic recording and reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten the necessary time required at a fast forwarding(FF) rewinding time or a fast reverse rewinding(REW) time even against a tape having a large load. SOLUTION: This device is equipped with one pair of reels in which the beginning and the end of a tape are wound and provided respectively, a calculating means 13 for calculating a tape winding amt. which is varied in accordance with rotation of the reels, a means 14 for detecting a deceleration starting position of a tape traveling speed based on the calculated tape winding amt. and a control means 15 for decelerating the tape traveling speed by a prescribed amt. in accordance with the detected deceleration starting position. At the time of fast forwarding rewinding the tape or of fast reverse rewinding the tape the tape traveling speed can be decelerated in the vicinity of the end of the tape. In this case, the device is provided with a detecting means 16 for detecting a change in the tape winding amt. calculated by the calculating means 13 and a deceleration adjusting control means 16 for adjusting the deceleration starting timing of a deceleration control means 15 when the above change is below a prescribed amt.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video tape
The present invention relates to a magnetic recording / reproducing apparatus such as a recorder (VTR), which can reduce the tape traveling speed near the end of the tape, particularly at the time of high-speed normal winding (FF) or high-speed reverse winding (REW) of a tape. The present invention relates to a recording / reproducing device.

[0002]

2. Description of the Related Art A conventional magnetic recording / reproducing apparatus of this type, for example, a VTR will be described with reference to FIGS.
Here, FIG. 4 is an explanatory view showing a schematic configuration of a conventional magnetic recording / reproducing apparatus, FIG. 5 is a block diagram showing a deceleration control section in the conventional magnetic recording / reproducing apparatus, and FIG. 6 is a deceleration operation in the conventional magnetic recording / reproducing apparatus. FIG. 7 is a flowchart showing the operation of the control unit, and FIG. 7 is an explanatory diagram showing a deceleration curve curve in a conventional magnetic recording / reproducing apparatus.

In FIG. 4, the start and end of a video tape 1 are wound around a pair of reels including a supply reel 2 and a take-up reel 3. A supply-side reel sensor 4 and a take-up reel sensor 5 are mounted on the supply-side reel 2 and the take-up side reel 3, respectively. It is measured by the reel cycle measuring unit 11 and the winding-side reel cycle measuring unit 12.

[0004] Based on the measurement results of the reel cycle measuring units 11 and 12, the calculation circuit 13 of the deceleration control unit 6 determines whether the tape is to be rotated at high speed forward winding (FF) or at high speed reverse winding (REW). Calculate the tape winding amount. When the calculated tape winding amount reaches a predetermined value, the deceleration start position detection unit 14 recognizes that the tape is near the end, and the deceleration operation control unit 15 sends a deceleration operation to the traveling system control unit 7. A start signal a is output.

[0005] In the traveling system control unit 7, a deceleration operation start signal a
, A capstan motor control signal b is output so as to reduce the rotation speed of the capstan motor 8, and the rotation speed of the reel 2 is controlled via the gear 9. Here, in order to set the reduction ratio of the capstan motor 8 to a constant rotation speed, the deceleration operation control unit 15 controls the deceleration operation to be sequentially decelerated at regular intervals as shown in the flowchart of FIG.

For example, when the rotation speed during high-speed normal winding (FF) is set to 10000 Hz, the rotation of the capstan motor 8 is reduced by 100 Hz in increments of 100 Hz, and the period for holding the rotation speed is set to 100 msec. Value is 1
After holding at 0000 Hz for 100 msec, 9900
The frequency is maintained at 100 Hz for 100 msec. Such an operation is repeated until the rotation speed of the low-speed traveling is reached.

Therefore, when designing the deceleration operation, first, the time of the deceleration operation period is determined, and the rotation of the deceleration is made in accordance with the tape length required until the end of the deceleration so that the deceleration curve curve shown in FIG. Determine the number.

[0008] Thus, the deceleration operation is started from near the end of the tape at the time of high-speed normal winding (FF) or at the time of high-speed reverse winding (REW) of the tape, and the running speed becomes low immediately before the end of the tape. With such control, it is possible to prevent a large load from being applied to the tape end portion.

[0009]

However, in the case of the above-mentioned conventional magnetic recording / reproducing apparatus, when the tape is wound at high speed forward winding (FF) or at high speed reverse winding (REW), the tape is wound up. When approaching the end of the tape, it performs a deceleration operation and enters the end of the tape with the speed reduced to the low speed.However, variations in the tape load due to the type of video tape, etc., and the power supply voltage of the capstan motor, Due to variations and the like, the capstan winding speed during the deceleration operation runs at a rotation speed lower than the set value.

For example, a deceleration curve curve for a video tape having a large load is as shown in FIG. 7B. In this state, if the number of rotations is sequentially reduced at regular intervals, the tape winding amount during the deceleration operation is reduced. When the number of rotations reaches a low speed, the tape remaining amount increases. For this reason,
There is a problem that it takes a long time to completely wind up the remaining tape at a low rotation speed.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and is intended for high-speed normal winding (FF) or high-speed reverse winding (RE) even for a tape having a large load.
It is an object of the present invention to provide a magnetic recording / reproducing apparatus capable of shortening the time required for W).

[0012]

According to the present invention, there is provided a magnetic recording / reproducing apparatus comprising: a pair of reels on which a start and an end of a tape are wound; and a calculating means for calculating a tape winding amount which fluctuates by rotation of the reel. A deceleration start position detecting means for detecting a tape deceleration start position of the tape running speed based on the tape winding amount calculated by the calculation means; and a deceleration start position detected by the deceleration start position detection means. Magnetic recording capable of reducing the tape traveling speed near the end of the tape at the time of high-speed normal winding or high-speed reverse winding of the tape, comprising deceleration operation control means for reducing the tape traveling speed by a predetermined amount. In the playback device,
Detecting means for detecting a change in the tape winding amount calculated by the calculating means; and when the change in the tape winding amount detected by the detecting means is equal to or less than a predetermined amount, the deceleration start timing of the deceleration operation control means is determined. And deceleration adjustment control means for adjustment.

By detecting a change in the tape winding amount during the deceleration operation, a difference between the original tape winding amount and the actual tape winding amount can be detected. Of the remaining tape can be predicted. If the change in the tape winding amount is equal to or less than a predetermined amount, the tape is started at a high speed by changing the tape deceleration start timing and increasing the period for holding the rotation speed of the capstan motor. You can increase your time.

Therefore, even when there is variation in the load of the tape to be wound and variation in the power supply voltage of the capstan motor, it is possible to equalize the remaining amount of the tape when the rotation speed reaches a low speed, and to wind the tape. Variations in the time required for picking can be suppressed.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS First Embodiment of a Magnetic Recording / Reproducing Apparatus of the Present Invention
The embodiment will be described below with reference to FIGS. 1 to 3, and the same parts as those in the above-described conventional example will be denoted by the same reference numerals and description thereof will be omitted. Here, FIG. 1 is a block diagram illustrating a deceleration control unit in the magnetic recording / reproducing apparatus of the present embodiment, FIG. 2 is a flowchart illustrating operations of a deceleration operation control unit and a deceleration adjustment control unit in the magnetic recording / reproducing apparatus of the present embodiment, FIG. 3 is an explanatory diagram showing a deceleration curve curve in the magnetic recording and reproducing apparatus of the present embodiment.

As shown in FIG. 1, the magnetic recording / reproducing apparatus of this embodiment detects a change in the tape winding amount calculated by the calculation unit 13 in addition to the configuration of the conventional example, and detects the detected tape. When the change in the winding amount is equal to or less than a predetermined amount, a deceleration adjustment control unit 16 is provided for adjusting the deceleration start timing of the deceleration operation control unit 15 and changing the period during which the rotation speed of the capstan motor 8 is held. .

As shown in the flow chart of FIG. 2, the deceleration adjustment control section 16 decelerates the FF / REW speed from a certain position on the tape during the winding operation of the tape by FF or REW. Here, the calculation unit 13 calculates the tape winding amount, and the value is calculated by the deceleration start position detection unit 14.
Is always detected with a value corresponding to the type of tape stored in. When the tape winding amount reaches the deceleration start position, the deceleration operation is started by notifying the deceleration operation control unit 15 of the deceleration timing.

When the deceleration operation is started, the deceleration adjustment control unit 16 sets a value corresponding to the type of tape as a planned tape winding amount for each elapsed time from the start of deceleration, and an actual tape winding amount from the calculation unit 13. When the planned tape winding amount is larger than the actual tape winding amount, it is determined that the tape load is heavy and the capstan motor 8 has become lower than the target rotation speed.

Therefore, the deceleration adjustment control section 16 outputs a control signal to the deceleration operation control section 15 so that the correction time is added to the period for keeping the rotation speed of the capstan motor 8. Thus, the holding period of the capstan motor 8 at the same rotation speed can be made longer than the normal holding period, and the tape winding amount can be increased during this period.

At this time, as shown in FIG. 3, when the difference between the planned tape winding amount and the actual tape winding amount has a certain difference or more, as shown in FIG. The slope is dulled by the correction time. Therefore, since the amount of tape to be wound during the deceleration operation is increased, it is possible to reduce the remaining amount of tape when the rotation speed of the deceleration operation reaches a predetermined low-speed rotation speed. The accuracy of the time required can be increased.

As described above, in the magnetic recording apparatus according to the present embodiment, even when a tape having a different load is used, high-speed forward winding (FF) or high-speed reverse winding (REW) is performed.
At this time, the remaining tape amount when the rotation speed of the deceleration operation reaches the low speed rotation speed can be made uniform, and variations in the time required for winding the tape can be suppressed.

[0022]

Since the magnetic recording / reproducing apparatus of the present invention has the above-described configuration, the change in the tape winding amount during the deceleration operation is detected, and the change in the tape winding amount is equal to or less than the predetermined amount. By changing the tape deceleration start timing and increasing the period during which the rotation speed of the capstan motor is maintained, the time required for winding the tape at high speed can be increased.

Therefore, even if there is variation in the load of the tape to be wound or variation in the power supply voltage of the capstan motor, it is possible to make the remaining amount of the tape uniform when the rotation speed reaches a low speed, and to wind the tape. Variations in the time required for picking can be suppressed.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a deceleration control unit in one embodiment of a magnetic recording / reproducing apparatus of the present invention.

FIG. 2 is a flowchart illustrating operations of a deceleration operation control unit and a deceleration adjustment control unit in one embodiment of the magnetic recording / reproducing apparatus of the present invention.

FIG. 3 is an explanatory diagram showing a deceleration curve curve in one embodiment of the magnetic recording / reproducing apparatus of the present invention.

FIG. 4 is an explanatory diagram showing a schematic configuration of a conventional magnetic recording / reproducing apparatus.

FIG. 5 is a block diagram showing a deceleration control unit in a conventional magnetic recording / reproducing device.

FIG. 6 is a flowchart showing an operation of a deceleration operation control unit in a conventional magnetic recording / reproducing device.

FIG. 7 is an explanatory diagram showing a deceleration curve curve in a conventional magnetic recording / reproducing apparatus.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 tape 2 supply-side reel 3 take-up side reel 4 supply-side reel sensor 5 take-up side reel sensor 6 deceleration control unit 7 running diameter control unit 8 capstan motor 9 gear 11 supply-side reel cycle measurement unit 12 take-up side reel cycle Measurement unit 13 Calculation unit 14 Deceleration start position detection unit 15 Deceleration operation control unit 16 Deceleration adjustment control unit

Claims (1)

[Claims] 1. A pair of reels on which a start end and an end of a tape are wound, calculating means for calculating a tape winding amount which fluctuates by rotation of the reels, and a tape winding amount calculated by the calculating means. Deceleration start position detection means for detecting a deceleration start position of the tape traveling speed based on the deceleration start position detection means for decelerating the tape traveling speed by a predetermined amount according to the deceleration start position detected by the deceleration start position detection means A magnetic recording / reproducing apparatus capable of reducing the tape running speed near the end of the tape during normal high-speed winding or high-speed reverse winding of the tape, wherein the tape winding calculated by the calculating means is Detecting means for detecting a change in the amount of tape winding, when the change in the tape winding amount detected by the detecting means is equal to or less than a predetermined amount, A magnetic recording / reproducing apparatus provided with a deceleration adjustment control means for adjusting a deceleration start timing.