KR100209188B1 - Apparatus for controlling tape play in vcr - Google Patents

Abstract

The present invention relates to a tape run control apparatus for a V-seal, which eliminates a mechanical switch and immediately judges whether or not the tape is running abnormally with only a cycle of a rotation reel pulse of a supply reel and a take- Thereby protecting the tape and the set.

The present invention as described above provides a method of detecting a tape reel, comprising: detecting a pulse of a supply reel and a take-up reel according to a time change of a running time of a tape and comparing the detected pulse with a previous reel pulse period; And stopping the driving of the vehicle; And when the cycle of the reel pulse is changed within a predetermined range as the time increases, the tape runs normally.

Description

V-Sail tape over travel control device

FIG. 1 is a block diagram schematically showing a tape abnormality control apparatus for a conventional V-seal. FIG.

FIG. 2 is a block diagram schematically showing a tape abnormality running control apparatus for V-saws according to the present invention. FIG.

FIG. 3 is a waveform diagram showing the relationship between a supply reel and a take-up reel for explaining an abnormal tape running state of the present invention,

(a) is a change state diagram of a pulse cycle according to the rotation of the take-up reel during reproduction,

(b) is a state diagram of the change of the pulse cycle according to the rotation of the supply reel at the time of reproduction.

FIG. 4 is a signal flow diagram of a tape abnormality control method of the present invention.

DESCRIPTION OF THE REFERENCE NUMERALS

100, 101: rotation detecting section 102: supply reel

103: take-up reel 104, 105: waveform shaping unit

106: magnetic recording tape 107: display portion

108: Microprocessor 109: Deck driver

110: Servo unit 112: Pinch roller

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an abnormal driving detection of a recording medium of a video cassette recorder (hereinafter abbreviated as VSS), for example, a magnetic recording tape, and more particularly, The present invention relates to a tape abnormality control apparatus for a V-SEAL, which automatically detects a sagging or pulling of a tape caused by an abnormality of a tape and stops reproduction in the event of an abnormality, thereby protecting the tape from damage or fatal failure of the set.

Generally, in the V-thread, a timer roller is coupled with the magnetic recording tape so as to rotate in response to the movement of the tape between the magnetic tape 11 and the take-up reel (Take Up Reel) .

The remaining amount of the tape and the state of the mold are determined from the length of the magnetic recording tape moved, and the amount of the recording time remaining in the supply reel is determined by the amount of the moving magnetic tape The length of the recording tape and the speed at which the tape is moved.

It is also known that the signal pulse developed in the output of the timer roller is frequency divided and the frequency divided output is supplied to a counter operating as a time indicator.

In the foregoing description, the remaining amount of the magnetic recording tape and the precision with which the running state can be measured are determined by the slippage between the timer roller and the drive magnetic recording tape and the accuracy with which the diameter of the timer roller is maintained during manufacture.

Therefore, strict attention must be paid to the accuracy with which the timer roller is manufactured and the uniformity of the material and the bearing structure, thereby increasing the production cost of the timer roller.

Further, due to frictional contact with the timer roller due to rotation, for example, there is a tendency that the magnetic recording tape is damaged due to sagging of the tape or high elasticity of the tape due to an error in the set.

Further, on the basis of the reproduced count control signal, the magnetic tape is pre-recorded on the magnetic recording tape for use as a clock pulse signal by the timer counter displayed by the tape position (remaining amount) and the running state, Such as a control pulse signal CTL, which is reproduced as it is moved.

However, this known method can not be applied when recorded on an empty tape.

Further, in order to determine the total amount of tape on the take-up reel or supply reel and to calculate the absolute time of the magnetic recording tape position and the running speed using the length of the magnetic recording tape remaining to be recorded or reproduced and the determined amount of tape It is known that the position of the magnetic recording tape and the abnormal running of the tape are detected by initially squaring the number of pulses generated in response to the rotation of the supply reel.

According to one of other known methods of determining the position and running of the magnetic recording tape, the rotation number of each of the supply reel and the take-up reel is detected during the movement of the magnetic recording tape through a relatively short distance, And this voltage is converted into a display of the remaining amount of the magnetic recording tape and the abnormal state.

However, since the ratio of the feed reel and the take-up reel revolutions is determined only while the magnetic recording tape is moved through a relatively short distance, the monotonically increasing function is obtained due to the reason of quantization error on the rotation or non- .

Therefore, it is difficult to ensure proper recognition of the minute sides of the reel while the magnetic recording tape is moving.

Furthermore, when it is desired to reproduce a given magnetic recording tape position, for example, for queuing or the like, it is not possible in existing systems to obtain high precision in determining the position and running state of the tape.

In order to prevent breakage of the magnetic recording tape in the rewinding (forward) mode or the forward fast (fast forward) mode of the tape as one of well-known known techniques, the number of revolutions of the take- There is a method of winding the reel motor revolutions of the deck portion at a slower speed at the last portion of the magnetic recording tape. In addition, there is a method in which a micro switch is provided which is in contact with the tape at the portion to which the tape is transported at the time of reproduction, There is a method in which the microswitch operates to make an abnormality in the magnetic recording tape.

However, in this method, when the tape is stretched due to abnormalities of the V-set or tape and condensation at the time of reproduction, the microswitch senses and stops the running of the tape. At this time, There is a problem that a malfunction is caused and a magnetic recording tape is elongated to some extent and then it is detected and stopped or is not able to detect at all. In addition, by the method using a reel pulse, In the case of rewind or fast forward, it is used to protect the tape by rotating it at a low speed at the end of the tape, so that it is not detected when a slight abnormality occurs in the running of the tape.

FIG. 1 is a block diagram schematically showing a conventional tape abnormality driving control device.

1, there are shown a supply reel 102 for supplying a magnetic recording tape 106 formed with a reflection plate 102a and a transparent hole 102b and a magnetic recording tape 106 wound around the supply reel 102, A reflective plate 103a for winding up the transparent film 106, a take-up reel 103 in which a transparent hole 103b is formed; When the deck cassette is loaded, an optical signal is irradiated to the supply reel 102 and the take-up reel 103 so that the reflection plates 102a and 103a of the supply reel 172 and the take- First and second rotation detecting portions 100 and 101 for detecting the reflected light obtained by transmission or reflection of the light to the light receiving portions 102b and 103b by electric signals; First and second waveform shaping units 104 and 105 for waveform shaping the electric signal according to the respective reel rotations detected by the first and second rotation detecting units 100 and 101; A micro switch (111) installed adjacent to the magnetic recording tape (106) to detect the slack of the tape; The reel pulses on the supply side and the winding side obtained from the first and second waveform shaping units 104 and 105 are calculated to determine the remaining amount of the magnetic recording tape 106 wound on the supply reel 102 and displayed on the display unit 107 A microprocessor 108 for controlling the overall system operation of the VCI by determining the extension of the tape according to the signal detected by the micro switch 111; A servo unit 110 for controlling the rotation speed and rotation phase of the head, the traveling speed of the tape, and the like by control signals generated by the microprocessor 108; A capstan 113 rotating by a control signal of the servo unit 110 to press the pinch roller 112 to transfer the magnetic recording tape 106; And a deck driving unit 109 for loading and unloading the cassette case to the control signal of the microprocessor 108.

The conventional tape abnor- mality control device configured as described above will be described in detail as follows.

Referring to FIG. 1, when a user loads a cassette case containing a magnetic recording tape 106 in a deck and plays back through a key operation unit or a remote controller (not shown), the microprocessor 108 drives the servo The head drum and the capstan 113 are rotated through the unit 110 and the reel motor is rotated through the deck driving unit 109 to load the cassette case.

The capstan 113 presses the magnetic recording tape 106 together with the pinch roller 112 and transfers it to the take-up reel 103 side.

When the supply reel 102 and the take-up reel 103 rotate in this manner, the first and second rotation detecting portions 100 and 101 irradiate the supply reel 102 and the take-up reel 103 with optical signals The reflection is detected by reflection or transmission from the reflection plates 102a, 103a and the transparent holes 102b, 103b.

As is well known, the first and second rotation detecting units 100 and 101 include a light emitting element that emits an optical signal to the supply reel 102 and the take-up reel 103, And a light receiving element that detects reflected light reflected through the reflection plates 102a and 103a of the take-up reel 103 and outputs the detected light to an electric signal.

The signals detected by the light receiving elements of the first and second rotation detecting units 100 and 101 are waveform-shaped through the first and second waveform shaping units 104 and 105 and input to the microprocessor 108 do.

The microprocessor 108 calculates the remaining time of the magnetic tape 106 at the current time using the reel pulse input from the first and second waveform shaping units 104 and 105 and the tape speed according to the standard or double speed mode And displayed on the display unit 107.

When the tape of the magnetic recording tape 106 is loosened, the micro switch 111 is brought into contact to cause the microprocessor 108 to stop the reproduction.

However, as described above, the tape abnormality control apparatus of the conventional V-seal has a problem in that the reel pulse detection method is merely a method of indicating the remaining time of the tape or performing a low speed running at the end of the tape at the time of rewinding or fast forward, When the tape is stretched at the time of reproduction, the microswitch senses and stops the running. At this time, the microswitch accurately detects the sagging of the tape due to the mechanical contact of the microswitch and the malfunction caused by the installation position The tape is damaged and a deadly set is damaged. In addition, since a micro switch having a high cost is installed on the deck, the price of the set is increased.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a tape reel apparatus and a reel tape reel that are capable of detecting a tape abnormality by only determining the period of a reel pulse of a supply reel and a take- And to provide a tape abnormality driving control device for a V-seal.

It is another object of the present invention to provide an apparatus and a method for calculating a remaining time of a tape with a change of a reel pulse with a lapse of time in a reproduction mode, a cue mode and a fast forward (FF) / rewind To detect it.

It is a further object of the present invention to provide a method and apparatus for determining whether or not a magnetic recording tape is abnormal by comparing a detected reel pulse cycle from a reel side of either a supply reel or a take- .

It is another object of the present invention to improve the productivity of the product and to reduce the production cost by eliminating the installation difficulty due to the deletion of the micro switch from the deck.

According to an aspect of the present invention, there is provided a method for controlling a tape abnormality of a V-seal, comprising: detecting a pulse of a supply reel and a take-up reel in accordance with a time change of a running time of a tape, Comparing; If there is no change in the reel pulse period as a result of the comparison, it is determined that the tape is abnormal and the running is stopped; And when the cycle of the reel pulse is changed normally according to the increase of the time, the tape runs normally.

In the above, when the reel pulse period on the side where the tape is wound or unwound due to the comparison of the reel pulse cycle does not decrease or increase with time, it is determined that the tape running is abnormal, Do.

In this case, only the reel pulse of either the supply reel or the take-up reel is detected to determine the abnormal running state of the tape.

Determining whether the cycle of the reel pulse is within a predetermined range when the reel pulse cycle on the side where the tape is unwound due to the comparison of the reel pulse cycle changes with an increase in time; Determining that the tape is out of order if the result of the determination is out of the predetermined range;

In order to accomplish the above object, according to another aspect of the present invention, there is provided an apparatus for controlling a tape abnormality of a V-seal, which comprises a rotation detecting means and a waveform shaping means for detecting a reel pulse according to rotation of a supply reel and a take- Memory means; A comparison means for comparing the detected current reel pulse main record with a previous reel pulse period stored in the memory means and an increase in time; And a microprocessor for stopping and normally running the running of the tape.

As a result, it is possible to judge whether or not the tape is running abnormally by only the rotation reel pulse of the supply reel and the take-up reel during the tape running by the playback mode, the queue mode and the rewind / fast forward mode, Of course, as with the prior art, it has the advantage of displaying the tape remaining time.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 is a block diagram schematically showing a tape abnormality driving control apparatus of the present invention.

Referring to FIG. 2, a conventional V-seal can be found, which includes the supply reel 102, the take-up reel 103, the pinch roller 112, the capstan 113, (100), (101), and first and second waveform shaping sections (104, 105).

According to the present invention, such a V-seal includes a memory unit 114 for detecting and storing a reel pulse according to rotation of the supply reel 102 and the take-up reel 103 through the first and second rotation detecting units 100 and 101, )Wow; Is changed in accordance with an increase in the reel pulse period and time of the previous supply reel 102 and the take-up reel 103 stored in the memory 114 and is transmitted through the first and second waveform shaping units 104 and 105 A comparison unit 115 for comparing the input current reel pulse main record; The microprocessor 101 determines whether there is a change in the reel pulse period compared by the comparator 115 and controls the deck drive unit 109 and the servo unit 110 to stop the running of the magnetic tape 106, Lt; RTI ID = 0.0 > 108 < / RTI >

4 is a signal flow chart of the tape abnormality driving control method of the V-shaped coil according to the present invention, in which the magnetic recording tape 106 wound around the supply reel 102 at the beginning is wound on the plug- And the pulse cycle of the supply reel 102 is reduced.

Of course, when the magnetic recording tape 106 is running normally, the take-up reel 103 side is the same as the flow procedure of FIG. 4 except that the reel pulse cycle is increased with time.

Referring to FIG. 4, the deck drive unit 109 and the servo unit 110, which are caused by the control signal of the microprocessor 108 according to the playback mode, the cue mode, and the rewind / fast forward mode, (ST100) of the rotation reel pulse of the supply reel 102 according to the change of the time at the time of running of the supply reel 102; Comparing (ST101, ST102) the rotation reel pulse period of the detected supply reel 102 with the previous reel pulse period corresponding thereto; (ST103, ST104) if the result of the determination is that the reel pulse cycle does not decrease according to the change of the time; If it is determined that the cycle of the reel pulse decreases with time, determining whether the amount of the reel pulse is within a predetermined range (ST105); (ST108, ST109) of judging that the magnetic recording tape 106 is dislodged and stopping the running when the distance is out of the predetermined range; If the reduction amount is within a predetermined range, it is determined that the vehicle is in a normal traveling state, and the step of moving the magnetic recording tape 106 in accordance with the set mode is performed (ST107).

Here, the reel pulse period on the side of the take-up reel 103 for winding the magnetic recording tape 106 is increased. If the magnetic tape 106 is to be reduced, it is determined that the magnetic recording tape 106 is abnormal, The procedure is the same as that of the fourth embodiment.

Thus, a preferred embodiment of the present invention will be described in more detail with reference to FIGS. 2 to 4. FIG.

First, as shown in FIG. 1, when a user loads a cassette case containing a magnetic recording tape 106 on a deck and performs a playback mode, a cue mode, or a fast forward mode through a key operation unit or a remote controller The supply reel 102 and the take-up reel 103 are rotated by the setting of the first and second rotation detecting portions 100 and 101. The first and second rotation detecting portions 100 and 101 rotate the supply reel 102 and the take- (ST100), waveform shaping is performed through the first and second waveform shaping units 104 and 105, and the microprocessor 108 is provided.

The microprocessor 108 generates a rotation reel pulse on the side of the current supply reel 102 and the take-up reel 103 which are waveform-shaped and continuously input by the first and second waveform shaping units 104 and 105, And stored in the memory unit 114.

Thereafter, when the time elapses, the amount of the magnetic recording tape 106 wound around the supply reel 172 is reduced, and the amount of the magnetic recording tape 106 wound around the take-up reel 103 becomes large.

As a result, the number of revolutions of the supply reel 102 and the number of revolutions of the take-up reel 103 change in a semi-bilateral manner.

More specifically, when the magnetic recording tape 106 is wound on the supply reel 102 side toward the take-up reel 103 side as the magnetic recording tape 106 is transported in the forward direction as shown in FIG. 3, As shown in (a) of FIG. 9, in the initial state, the rotation reel pulse period of the take-up reel 103 is gradually increased in accordance with the amount of tape wound as the time elapses. As shown in (b) of FIG. 3, the pulse increases in accordance with the amount of tape wound initially, and the reel pulse cycle decreases as time elapses.

Using this principle, when the magnetic recording tape 106 is fed in the forward direction, the microprocessor 108 controls the current reel pulse cycle, which is continuously detected in accordance with the rotation of the supply reel 102 or the take-up reel 103, (Step ST101) through the previous reel pulse main record comparison unit 115 stored in the storage unit 114 of FIG.

In other words, as shown in FIG. 4, the reel pulse period on the supply reel 102 side and the previous reel pulse period corresponding to the reel pulse period on the memory unit 114, As a result, it is searched whether the current reel pulse period is decreased (ST102).

If it is determined that the reel pulse period does not decrease even after a lapse of time, the deck driving unit 109 and the servo unit 110 (ST103) are regarded as abnormal running of the magnetic recording tape 106 (Step ST105). In this case, the magnetic recording tape 106 is stopped.

As a result of the search in the step ST102, if the reel pulse period is gradually decreased by the elapse of time, it is searched whether the reel pulse period is within a certain range (step ST105).

If it is determined that the reel pulse period that is reduced as a result of the search in the step ST105 is within a certain range, it is determined that the magnetic tape 106 is currently traveling and the deck drive unit 109, The control unit 110 controls the magnetic recording tape 106 to continue to run (ST107)

When the reduced reel pulse period is out of a certain range in step ST105, it is determined that the magnetic tape 106 has disengaged from the traveling system (step ST108) (Step ST107) to prevent the tape from being damaged and the V-seal set to be damaged.

In the above, a certain range of setting is calculated by estimating through the experimental value when the magnetic recording tape 106 normally travels.

On the other hand, when the magnetic recording tape 106 travels in the forward direction, the reel pulse cycle on the take-up reel 103 side increases as time elapses. If the magnetic tape 106 is decreased, Stopping or stopping the magnetic recording tape 106 in the same manner as in steps ST106 to ST109 depending on whether or not the increased reel pulse cycle is within a certain range, do.

Here, although the magnetic recording tape 106 has been described only in the case of running in the forward direction, the abnormal running of the tape can be detected in the above-described manner also in the rewind mode.

As described above, the reel pulse detected by the supply reel 102 and the take-up reel 103 and the tape speed according to the standard or double speed mode are used to calculate the remaining tape time, .

As described above in detail, in the present embodiment, it is determined whether or not the tape is running abnormally with only the period of the rotation reel pulse of the supply reel and the take-up reel according to the passage of time during tape running, There is an effect that it is possible to protect against the malfunction of the deadly set as well as the burn-out of the tape.

In addition, this embodiment can calculate the remaining time of the tape and the abnormal running of the tape simultaneously with the change of the reel pulse with the lapse of time in the reproduction mode, the cue mode and the fast forward (FF) / rewind It is effective.

In addition, since the micro switch is not provided on the deck, the present embodiment can improve the productivity of the product and reduce the production cost.

Moreover, although specific embodiments of the present invention have been illustrated and described, it will be appreciated that the invention is not limited to this, since it is possible to modify remedies.

It is therefore to be understood that the invention and all modifications consistent with the true spirit and scope of the claimed principles set forth herein may be covered therein.

Claims (2)

Memory means for detecting and storing a reel pulse according to the rotation of the supply reel and the take-up reel through the rotation detecting means and the waveform shaping means at the time of tape running; Comparison means for comparing the detected current reel pulse main record with the previous reel pulse period stored in the memory means and an increase in time; And a microprocessor for stopping and normally stopping the running of the tape according to the presence or absence of a change in the reel pulse period according to an increase in time as a result of comparison by the comparing means. The apparatus according to claim 1, characterized in that the microprocessor detects an abnormal travel of the tape by detecting a reel pulse of either a supply reel or a take-up reel.