JPH02232808A - Magnetic taper recording and reproducing device - Google Patents

Abstract

PURPOSE:To improve tracking accuracy of a magnetic tape and a corresponding magnetic head by adjusting the position of each magnetic head according to head positioning information. CONSTITUTION:A servo head 3-j (1<=j<=m) traces a track 5-j on a magnetic tape 6 which a position information signal is recorded and inputs the output as tracking servo information on each magnetic head 1-i (1<=i<=n) corresponding to a head 3-j to a head positioning control circuit 9. According to an output signal from the circuit 9, a head position adjusting part 10 drives each head 1-i to a position to attain an optimum tracking condition. Simultaneously, tracking information through a detection circuit 8 is inputted to a servo head positioning control circuit 11. According to an output signal therefrom, a servo head position adjusting part 12 drives the head 3-j to a position to attain an optimum tracking condition, thereby reproducing more accurate position information. At the time of recording, a head detecting part 13 detects and records the position of the head 1-i.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a tracking method in which a plurality of magnetic heads are divided into several groups and tracking is performed for each group, and a magnetic tape recording/reproducing apparatus having the method. .

[Conventional technology]

As described in Japanese Patent Application Laid-Open No. 58-97129, in conventional devices, the magnetic head body is integrated with a large number of heads and servo heads, each of which is replaceable, and each has multiple tracks with highly accurate pinch intervals. The servo head records one or two servo tracks parallel to the magnetic track on the magnetic tape, and during playback, the signals from the servo tracks are used to record the information on the magnetic tape. Another related known example is Japanese Patent Application Laid-Open No. 107-1983.
Also in Publication No. 33 and Publication No. 59-2225,
Tracking is performed by position control using a magnetic head. [Problems to be Solved by the Invention] In the above-mentioned conventional technology, tracking control for each magnetic head body having a large number of heads is possible, but consideration must be given to more minute positional deviations due to changes in track spacing, etc. However, there was a problem in that it was not possible to correct the misalignment between the magnetic head and the corresponding track caused by changes in tape width, differences in head pitch between different types of devices, etc.
An object of the present invention is to make it possible to adjust the position of each magnetic head body, thereby adjusting the position of each magnetic head body.
The goal is to improve the tracking accuracy of the corresponding magnetic head, increase the reliability of reproduced information, and enable higher track density on magnetic tape. Another object of the present invention is to manufacture a magnetic head section, and aims at miniaturization and uniformity. [Means for solving the problem] In order to achieve the above object, in a magnetic tape recording and reproducing device, a magnetic head body in which a plurality of heads are divided into several groups, a servo head for recording and reproducing servo information,
A magnetic head body, a servo head with a multi-magnetic head section, a head positioning control circuit that performs head positioning control based on reproduction servo information, and a head position adjustment section that adjusts the head position based on the output signal of the head positioning control circuit. It is. Furthermore, in order to achieve the above object without installing a new servo head, the magnetic tape recording/reproducing apparatus is provided with a head positioning control circuit that performs head positioning control based on the reproduction output of the magnetic head body. Furthermore, in order to achieve the above objective without using playback information, as a means for detecting the displacement in the width direction of the magnetic tape, in FIG. and a tape width direction displacement detection circuit that detects the width direction displacement of the magnetic tape based on the electric signal and outputs it as tracking servo information. Furthermore, in order to achieve the above objective without using playback information, a tape displacement detector that outputs the displacement in the width of the magnetic tape as an electric signal and the electric signal are used as means for detecting the displacement in the width direction of the magnetic tape. , which is equipped with a tape width displacement detection circuit that detects displacement of the magnetic tape width and outputs tracking servo information. Furthermore, in order to achieve the above objectives, memory and a microcomputer are used in the head positioning control circuit. Furthermore, in order to achieve the above object, the present invention is equipped with an error detection section that detects a tracking error in the reproduced information, and a circuit that allows the output signal of the head positioning control circuit to be input to the head position adjustment section only when an error occurs. ．． Furthermore, in order to achieve the other objects mentioned above, the multi-magnetic head section is composed of a magnetic head body and an element that can be deformed by an electric signal. [Operation] The positional information signal reproduced by the servo head is input as tracking servo information to the positioning control circuit of the information recording/reproducing head. The head positioning control circuit outputs a head position adjustment signal for each magnetic head body, and the signal enables the head position adjustment section to adjust the position of each magnetic head body.

The same applies to the case where a servo head is not provided and the reproduction output state of an information reproduction signal is used as tracking servo information.

Furthermore, variations at both ends of the magnetic tape are detected by tape variation detectors, and a tape width direction/width displacement detection circuit detects displacement in the width direction of the magnetic tape or in the width of the magnetic tape from the amount of variation at the top and bottom ends. Based on the output signal, the head positioning control circuit outputs a position adjustment signal for each magnetic head body, and further enables the head position adjustment section to correct the position of each magnetic head body. Furthermore, there is an error detection unit that monitors the reproduction output status of the information reproduction signal and detects that an error has occurred in the reproduction status when the output level falls below a certain level, and information is reproduced using the output signal of the error detection unit when an error occurs. By enabling the head positioning control circuit to input the positioning information of each magnetic head body to the head position adjustment section using the reproduced output state of the signal, it is possible to perform unnecessary positional correction of the magnetic head body. becomes. Furthermore, by configuring the multi-magnetic head unit with a magnetic head body and an element that can be deformed by an electric signal, the position of the magnetic head body can be adjusted by applying any electric signal to the element that can be deformed by the electric signal. It is possible by giving.

〔Example〕

Examples of the present invention will be described below using FIGS. 1 to 11. FIG. 1 shows a first embodiment of the present invention. In the figure,
The track 5-j on which the positional information signal is recorded is traced by the servo head 3-j, and through the amplifier 7 and the detection circuit 8, the tracking servo of each magnetic head body 1-i corresponding to the servo head 3-j is activated. The information is input to the head positioning control circuit 9 as information. Head positioning control circuit 9
The output signal drives each magnetic head body 1-i to a position where the optimum tracking state is achieved by the head position rIRI1 section 10. At the same time, the tracking information that has passed through the detection circuit 8 is input to the servo head positioning control circuit 11.
Furthermore, the output signal is used by the servo head position adjustment section 12 to move the servo head to a position that provides an optimal tracking state, thereby making it possible to reproduce more accurate position information. Also, during recording, the position of the magnetic head body is detected by the head position detection unit 13, and the servo head 3-3 detects the recording information simultaneously.
It is also possible to record on servo track 5-j by j. As described above, by implementing the present invention, it is possible to correct the position of each magnetic head body, which has the effect of enabling more accurate tracking. FIG. 2 shows a second embodiment of the invention. In the figure,
The magnetic tape 6 is moving in the α direction with respect to the multi-magnetic head unit 2, and the information recording/reproducing track 4-i on the magnetic tape corresponding to the magnetic head body 1-i is misaligned. In this case as well, by controlling the positioning of each magnetic head 4-i in the same manner as in the first embodiment, there is an effect that more accurate 1 to racking is possible without being affected by variations in the width direction of the magnetic tape. ．． The same applies when the magnetic tape 6 moves in the b direction.

FIG. 3 shows a third embodiment of the present invention. In the figure, the magnetic tape 6 has a tape width of AW compared to the regular tape #W.
, and the track spacing also has a displacement of At with respect to the normal track spacing T. In this case as well, each magnetic head 4-
The positioning control of i has the effect of enabling more accurate tracking without affecting the displacement of the magnetic tape width. As for Aw and At, there is no problem with plus or minus.

FIG. 4 shows a fourth embodiment of the present invention. In the figure,
The magnetic tape 6 is moving in the direction a with respect to the multi-magnetic head unit 2, and the information recording/reproducing track 4-i on the magnetic tape corresponding to the magnetic head body 1-i is out of position. The reproduction output of the magnetic head body 1-i passes through an amplifier 7 and a detection circuit 8, and is inputted to a head positioning control circuit 9 as tracking servo information for each magnetic head body 1-i. The output signal of the head positioning control circuit lIt9 is the head position 1! l! 1 part 10, each magnetic head body 1
-i is driven to the position where the optimal tracking state is achieved, and optimal tracking is made possible. According to this embodiment, the variation in the width direction of the magnetic tape is affected similarly to the second embodiment without providing a position information signal track and a servo head for recording and reproducing a new position information signal. This has the effect of enabling more accurate tracking. FIG. 5 shows a fifth embodiment of the present invention. In the figure,
The magnetic tape 6 has a tape width of A with respect to the regular tape width W.
A displacement of w has occurred, and regarding the track spacing, a displacement of A1 has occurred with respect to the regular track spacing T. In this case as well, due to the same effect as in the fourth embodiment, saW1 has the effect of enabling more accurate tracking without affecting the displacement of the magnetic tape width, as in the third embodiment.
For at, plus or minus does not matter. FIG. 6 is a sixth actual example of the present invention. In the figure,
The magnetic tape 6 is moving in the direction a with respect to the multi-magnetic head unit 2, and the magnetic head body 1-i and the corresponding information recording/reproducing track 4-i on the magnetic tape are misaligned. The positional deviation of the magnetic tape with respect to the magnetic head body 1-i is detected by a tape width direction displacement detector 13, which outputs an electric signal, such as a strain gauge, and is inputted to a tape width direction displacement detection circuit 14. Tape width direction displacement detection circuit 1
4 outputs tracking servo information of each magnetic head body 1-i. The output signal of the head positioning control circuit 9 that has input the tracking servo information is input to the head position adjustment section 10, and the output signal of the head positioning control circuit 9 is inputted to the head position adjustment section 10, and the output signal of the head positioning control circuit 9 is inputted to the head position adjustment section 10, and the output signal of the head positioning control circuit 9 is inputted to the head position adjustment section 10. By sleeping in a position that is in a tracking state and enabling optimal tracking, it has the effect of enabling more accurate 1-racking. Displacement in the tape width direction can also be detected by displacement of a magnetic tape guide or the like.

FIG. 7 shows a seventh embodiment of the present invention. In the figure,
The magnetic tape 6 has a tape width of A with respect to the regular tape width W.
A displacement of W has occurred, and the track spacing is also . A displacement of 1 is occurring. The width displacement of the magnetic tape 6 is detected by a tape width displacement detector 15, which outputs an electric signal like a strain gauge.

The tape width displacement detection circuit 16 is connected to each magnetic head body 1-
Outputs the tracking servo information of i. The output signal of the head positioning control circuit 9 into which the tracking servo information has been input is input to the head position adjustment section 10, and each magnetic head body 1-i is moved to the information recording/reproducing rack 1-i on the corresponding magnetic tape. By driving to a position where the optimal tracking state is achieved with 4-i and making it possible to perform tracking with an appropriate Ik, there is an effect that more accurate tracking becomes possible. Displacement of the tape width can also be detected by the displacement of the magnetic tape guide, etc. For Aw and At, plus or minus does not matter. FIG. 8 shows an eighth embodiment of the present invention. In the figure,
The position information signal reproduced by the servo head 3-j is
Each magnetic head body 1-i passes through an amplifier 7 and a detection circuit 8.
is input into the memory 17 as tracking servo information. The output signal of the memory 17 is used to drive each magnetic head body 1-i to a position where the optimum tracking state is achieved by the head position adjustment section 1o. Furthermore, the contents of the memory 17 are updated when the magnetic tape 6 is attached or detached, and when the magnetic tape 6 is attached and the first recording/reproduction is performed, the magnetic head 1-
By writing the head position information detected by the head position detection section 13 into the memory 17, it becomes possible to write the head position information into the memory 17 for each magnetic tape. The above effects have the effect of enabling more accurate tracking. FIG. 9 shows a ninth embodiment of the present invention. In the eighth embodiment, the memory 17 that outputs the tracking servo information of each magnetic head body 1-i is realized by using a microcomputer 18, and the same operation as in the eighth embodiment results in higher precision. This has the effect of making tracking possible. FIG. 10 shows a tenth embodiment of the present invention. In the figure, the reproduced output from each magnetic head 1-i passes through an amplifier 7 and a detection circuit 8.
- Inputted to the head positioning control circuit 9 as racking servo information. At the same time, the reproduced output from the magnetic head 1-i passes through an amplifier 7 and a detection circuit 8 to an error detection section 1.
9 and monitors the playback status for any errors. When the error detection section 19 detects an error in the information reproduction state of the magnetic tape 6, it outputs a signal that enables the head position adjustment section 10 to input the output signal of the head positioning control circuit 9. The head position adjustment section 10 drives each magnetic head body 1-i to a position where the optimum tracking state is achieved based on the output signal of the head positioning control circuit 9.
Due to the above-described operation, the position of the magnetic head body 1-i can be adjusted only when an error is detected in the reproduced information, which has the effect of improving the reliability of the reproduced information. FIG. 11 shows an eleventh embodiment of the present invention, in which a multi-magnetic head section 2 is composed of a magnetic head body 1-i and an element 21 that can be deformed by an electric signal. By using an element that can be deformed by an electric signal, the device can be made smaller, and by manufacturing the magnetic head body and the element 21 which can be deformed by an electric signal in the same process, it is possible to manufacture a multi-magnetic head section. This has the effect of simplifying the process and standardizing the product. Note that it is also possible to further improve tracking accuracy by combining the above embodiments. Next, embodiments of the head positioning control circuit 9 and the head position adjustment section 10 in the above embodiment will be described with reference to the drawings.
In the above embodiment, when reproducing a magnetic tape, the reproduced signal reproduced by the magnetic head passes through an amplifier, and the voltage level of the reproduced signal is detected by a detection circuit. The level signal detected from the reproduced signal has the relationship shown in FIG. 13 with the relative positional deviation between the magnetic head and the corresponding track.
It is input to the converter I22 in the figure. The comparator 122 compares the level signal with a reference voltage set in advance for optimal tracking, and outputs the difference as a deviation signal. Head position adjustment section 1 shown in FIG.
0 is configured by using a part of the magnetic head body 1-i as a magnet part 25, supported by a spring material that deforms only in the vertical direction in the multi-magnetic head part, and composed of an iron core part 26 and a coil 27 surrounding the iron core part. The positional deviation signal output from the positioning control circuit 9 is sent to the voltage/current converter 2.
9. By applying an amount of current to the coil via the switching circuit 28 in accordance with the level of the deviation signal, it is possible to move the magnetic head body in the vertical direction in the figure. Furthermore, from the relationship between the reproduction level signal and the relative positional deviation between the magnetic head and the corresponding track shown in FIG.
Although it is not determined that the magnetic head body is shifted in the upward direction A or the downward direction A', the initial movement direction of the magnetic head body in the head position adjustment section 10 is set to be upward, for example, and
By comparing the level signal of the reproduced signal after an arbitrary time with the level signal of the previously reproduced signal held in the potential level holder 24 by the comparator 23, the amount of change in positional deviation is determined. If the amount of deviation is decreasing, the head position can be adjusted as is, and if the amount of deviation is increasing, the desired tracking can be achieved by reversing the current applied to the coil. In other words, the present embodiment describes only the tracking of one magnetic head body, which can approach the optimal tracking of B as much as possible. It will be realized. Figure 15 shows the electrical characteristics of the strain gauge in Figure 7. In this example, the standard value is set to the contraction side C,
By using the electrical characteristic of shrinkage, the amount of positional variation at both ends of the magnetic tape can be obtained as arbitrary electrical signals. A magnetic tape variation detection circuit calculates the width of the magnetic tape and the amount of variation in the width direction from two signals indicating the amount of positional variation at both ends of the magnetic tape.Furthermore, a head positioning control circuit determines the positional variation of each magnetic head body and its corresponding track. Outputs the amount of positional deviation as an electrical signal. At this time, it is thought that the 1/rack width on the magnetic tape changes in proportion to the amount of change in the magnetic tape width. The positional deviation signal is input to the head position adjustment section shown in FIG. 14, and is used to track each magnetic head body. [Effects of the Invention] According to the present invention, since the position of each magnetic head body can be adjusted using head positioning information, tracking between the magnetic head body and the corresponding track on the magnetic tape can be performed with higher precision. This makes it possible to improve the reliability of reproduced information. Furthermore, since tracking accuracy can be improved, magnetic tape recording and reproducing devices can handle higher track densities on magnetic tape. Furthermore, when the present invention is realized by the configuration of the multi-magnetic head section of the present invention, it is possible to prevent the device from increasing in size, and the manufacturing process is also facilitated.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a first embodiment of the magnetic tape recording/reproducing apparatus of the present invention, FIG. 2 is a block diagram showing a second embodiment of the magnetic tape recording/reproducing apparatus of the present invention, and FIG. FIG. 4 is a block diagram showing a third embodiment of the magnetic tape recording and reproducing apparatus of the present invention, FIG. 4 is a block diagram showing a fourth embodiment of the magnetic tape recording and reproducing apparatus of the present invention, and FIG. , a block diagram showing a fifth embodiment of the magnetic tape recording and reproducing apparatus of the present invention, FIG. 6 is a block diagram showing a sixth embodiment of the magnetic tape recording and reproducing apparatus of the present invention, and FIG. FIG. 8 is a block diagram showing a seventh embodiment of the magnetic tape recording/reproducing apparatus of the invention. FIG. 9 is a block diagram showing the eighth embodiment of the magnetic tape recording/reproducing apparatus of the invention. FIG. 10 is a block diagram showing a ninth embodiment of the magnetic tape recording/reproducing apparatus of the present invention.
FIG. 11 is a block diagram showing an eleventh embodiment of the multi-magnetic head section of the present invention. FIG. 12 is an embodiment of the head positioning control circuit in each embodiment of the present invention. 13 is a diagram showing the relationship between the amount of positional deviation in the output signal of the detection circuit and the reproduced signal level in the embodiment of the present invention, and FIG. 14 is a block diagram showing the head position adjustment unit in the embodiment of the present invention. FIG. 15 is a diagram showing the relationship between the direction and amount of distortion in the output signal of the distortion detector and the output current in the embodiment of the present invention. 1... Magnetic head body (1≦i≦n), 2... Multi-magnetic head section, 3... Servo head (1≦j≦m),
4... Information recording/reproducing track (1≦i≦n) corresponding to the magnetic head body 1, 5... Servo track corresponding to the servo head 3, 6... Magnetic tape, 7... Amplifier, 8... Detection circuit, 9... Head positioning control circuit, 10... Head position adjustment section, 11... Positioning control circuit for servo head, 12... Servo head position adjustment section 513... Tape Width direction variation detector, 14...
- Tape width direction displacement detection circuit, l5... Tape width variation detector, 16... Tape width displacement detection circuit, 17...
Memory, 18...Microcomputer, 19...Error detection unit, 20...Signal passage control circuit, 21...Element deformable by electric signal, 22...Comparator I, 23
... Comparator ■, 24 ... Voltage level holder,
25...Magnet, 26...Iron core, 27...Coil, 28...Switching circuit. 29...Voltage-to-current converter. Collected Figures Collection f1 Figure Collection I5

Claims (11)

[Claims] (1) In a magnetic tape recording/reproducing device having a plurality of magnetic heads, the plurality of magnetic heads are divided into several groups, and at least one magnetic head body capable of moving in a direction perpendicular to the gap width direction of the heads is provided. A multi-magnetic head unit consisting of the above magnetic head body and a servo head that records and reproduces tracking servo information corresponding to the magnetic head body from a servo information recording and reproduction track, an amplifier that amplifies the recording and reproduction signal by the servo head, and a reproduction a detection circuit that detects the output signal of the amplifier, a head positioning control circuit that uses the output signal of the detection circuit as tracking servo information and performs positioning control for each magnetic head body, and a head positioning control circuit that uses the output signal of the head positioning control circuit to 1. A magnetic tape recording and reproducing apparatus comprising: a head position adjusting section for adjusting the position of the magnetic head; and a head position detecting section for detecting the position of the magnetic head body. (2) The magnetism according to claim 1, wherein the relative positional deviation between the magnetic head body and the data recording/reproducing track, which occurs due to fluctuations in the width direction of the magnetic tape, is used as tracking servo information to perform tracking. Tape recording and playback device. (3) Tracking is performed by using the relative positional deviation between the magnetic head body and the data recording/reproducing track as tracking servo information, which is caused by a change in the track interval on the magnetic tape. Magnetic tape recording and reproducing device. (4) Instead of the reproduction output of the servo head, the reproduction output of the magnetic head body causes fluctuations in the width direction of the magnetic tape, that is, relative positional deviation between the data recording/reproduction track on the magnetic tape and the magnetic head body. 3. The magnetic tape recording and reproducing apparatus according to claim 2, wherein the magnetic tape recording and reproducing apparatus detects the detected information and uses the detected information as tracking servo information to perform tracking. (5) Instead of the reproduction output of the servo head, the reproduction output of the magnetic head body causes displacement of the track interval on the magnetic tape, that is, the relative position between the data recording/reproduction track on the magnetic tape and the magnetic head body. detect the deviation,
4. The magnetic tape recording and reproducing apparatus according to claim 3, wherein tracking is performed using tracking servo information. (6) Instead of using the reproduction output of the servo head as tracking servo information, a detector is provided to detect variations in the width direction of the magnetic tape, and the output signal of the detector is used to track data recording and reproduction on the magnetic tape. 3. The magnetic tape recording and reproducing apparatus according to claim 2, wherein a relative positional deviation between the magnetic head body and the magnetic head body is detected and outputted as tracking servo information to the head positioning control circuit. (7) Instead of using the reproduction output of the servo head as tracking servo information, a detector is provided to detect displacement of the magnetic tape width, and the output signal of the detector is used to detect the data recording/reproducing track on the magnetic tape and the magnetic tape. 4. The magnetic tape recording and reproducing apparatus according to claim 3, wherein a relative positional deviation with respect to the head body is detected and outputted as tracking servo information to the head positioning control circuit. (8) The magnetic tape recording and reproducing apparatus according to claim 1, wherein the head positioning control is performed using a memory instead of the head positioning control circuit. (9) The magnetic tape recording/reproducing apparatus according to claim 1, wherein a microcomputer is used as the head positioning control circuit to perform head positioning control. (10) An error detector that monitors whether or not an error has occurred in the reproduced information, and signal passage control that allows the output signal of the head positioning control circuit to be input to the head position adjustment section based on the output signal of the error detector when an error is detected. 6. The magnetic tape recording and reproducing apparatus according to claim 4, further comprising a circuit. (11) In a multi-magnetic head unit, a magnetic head body including at least one magnetic head that divides a plurality of magnetic heads into several groups and is movable in a direction perpendicular to the head gap width direction; A multi-magnetic head unit comprising an element that connects head bodies and allows each magnetic head body to be deformed by an electric signal in order to be able to move in a direction perpendicular to the head gap width direction. .