JPH0196850A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To eliminate a malfunction, to travel a tape at a high speed, and to stabilize an output by providing a magnetic head means for reading control information to abut to the recording surface and the opposite side surface of a recording medium to travel at a high speed. CONSTITUTION:A CTL coding control signal is recorded on a magnetic tape 2 while the magnetic tape 2 is delivered so as not to be wound around a rotary drum 7 and brought into contact with an audio control A/C head 9. At the time of a high-speed cueing, the rear surface of the magnetic tape 2 is brought into contact with an exclusive-use reproducing head 10, which is provided separately from the A/C head 9, the magnetic tape 2 is traveled at a high speed, and a control information signal is detected from the rear surface of the tape 2. Consequently, the abrasion of the head 9 can be reduced, and the malfunction can be prevented. Further, since the control information signal is detected from the rear surface, the tape 2 is not damaged. Moreover, since the tape 2 is never brought into contact with the head 9 at the time of the high-speed traveling, a sufficient high-speed traveling can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention particularly relates to a magnetic recording/reproducing device having a high-speed cueing function.

[Conventional technology]

In recent years, with the improvement of high-density magnetic recording technology, household VT
Even in R (video tape recorders), many programs have come to be recorded using long-duration tapes. Therefore, it is necessary to locate the beginning of the program at high speed, and magnetic recording and reproducing apparatuses equipped with this high-speed cueing function have been put into practical use.

FIG. 3 is a schematic diagram of a conventional magnetic recording/reproducing apparatus of this type. In the figure, 1 is a VT that stores a magnetic tape 2.
In the R cassette, the magnetic tape 2 is wound around a supply reel 3 and a take-up reel 4. 5.6 is a guide post for loading, and during recording, the magnetic tape 2 is wound around the rotating tram 7 as shown in the figure. 8 and 9 are rotating tram 7
A full-width erase head and an audio control head (hereinafter referred to as A/C head) are arranged in the acrobatics.

A recording head and a reproducing head are attached to the rotary drum 7, and programs (images) are recorded and reproduced by these. At that time, when recording, that is, in recording mode, erase 13
and a cue signal, and the full-width erasing head 8 records the cue signal at the beginning of the program at the same time as erasing. Then, the beginning of the program is determined by a tension pole or a cue sensor built into the gap between the cassette halves.

However, in this conventional system, since the cue signal is recorded by the full-width erase head 8, it is possible to locate the beginning of a program, but information such as the recording address of the program, the elapsed time of one hour, the date of recording, etc. cannot be detected.

Therefore, in order to detect such information, C
It has been proposed to perform cueing using a TL coding method. In order to detect the position of the video track during playback, control information signals such as index signals and address signals for cueing are recorded for each piece of recorded information, and these signals and CTL signals are detected during playback. It is used to cue up. That is, in the recording mode, the duty ratio of the search signal of the capstan motor is changed by the A/C head 9, and the index signal and address signal (CT
L coding data) is recorded as a digital signal at the same time as the recording information. Then, during high-speed cueing (high-speed search), as shown in FIG. 4, the magnetic tape 2 is fed out so as not to be wound around the rotating tram 7, and the signal is detected while making contact with the A/C head 9. This regenerated 4
No. 3 is processed as digital data, so that the magnetic recording tape 2 can be stopped at any desired program or address.

[Problem that the invention seeks to solve]

However, in the apparatus having the cueing function as described above, since the A/C head 9 records and reproduces the cueing control information signal, there are the following problems.

<4> Since the magnetic tape 2 runs at high speed on the surface of the A/C head 9, wear of the A/C head 9 is significantly accelerated, and the tape surface is easily damaged, causing malfunctions.

(b) Since the magnetic tape 2 is brought into contact with the A/C head 9 consisting of two heads, the load is large and the tape cannot run at a sufficient speed.

(c) Since the control information signal is also reproduced by the recording head, the output becomes unstable due to the deviation of the magnetic tape 2 in the track width direction during high-speed cueing.

(d) For the above reasons, reliability is reduced and the cost becomes high.

The present invention has been made in view of these problems, and it is an object of the present invention to provide a magnetic recording and reproducing apparatus that is free from malfunctions, is capable of high-speed tape running, and has stable output.

[Means for solving problems]

The present invention has been made with the aim of eliminating the above-mentioned drawbacks, and its means include an apparatus for reading recorded information and control information related to the recorded information from a magnetic recording medium on which the control information is recorded. The present invention includes means for causing the recording medium to run at high speed, and magnetic head means for reading the control information by contacting the recording medium running at high speed on a surface opposite to the recording surface of the recording medium.

[Effect]

In the magnetic recording and reproducing apparatus of the present invention, the cue and address +11i recorded on the magnetic tape running at high speed are
When detecting control information signals such as information, the detection head is brought into contact with the magnetic tape from the side opposite to the recording surface, which prevents damage to the tape and wear of the head during high-speed running. Unstable output due to deviation in the track width direction is eliminated.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a configuration diagram showing a magnetic recording/reproducing apparatus according to the present invention. In the figure, 1 to 9 are the same components as those with the same reference numerals in FIG. It is the head.

In the apparatus with the above configuration, the control information signal which is CTL coding data is A
/C head 9 is recorded on the magnetic tape 2. and,
During high-speed cueing, press the back side of magnetic tape 2 or A as shown in the figure.
The magnetic tape 2 is run so as to come into contact with a dedicated reproducing head 10 provided separately from the /C head 9, and control information No. 13 is detected from the back surface of the magnetic tape 2. in this way,
Since the -V reproducing head 10 is installed in the middle of the tape running path to detect the control information signal, damage to the magnetic tape 2 and wear of the A/C head 9 as in the conventional case are significantly reduced, and malfunctions are prevented. Prevented. At this time, since the control information signal is detected from the back side of the tape, the reproducing head 10 only comes into contact with the base film on the back side of the tape, and the magnetic tape 2 is hardly damaged. Furthermore, since the magnetic tape 2 does not come into contact with the A/C head 9 during this high-speed running, the load is reduced and the magnetic tape 2 can run at a sufficiently high speed. At the same time, the magnetic tape 2 is transferred to the A/C head 9.
This eliminates the need for a contact mechanism, improving reliability and reducing costs.

The above-mentioned raw head 10 may be placed anywhere as long as it is in contact with the back side of the tape, but as shown in FIG. If provided, magnetic tape 2 can be used during high-speed search.
There is no need to extend the edges, and the mechanical mechanism can be simplified. In addition, in order to eliminate the fluttering of the magnetic tape 2 during high-speed running, a taper for guiding the magnetic tape 2 is provided in the raw head 10, and the magnetic tape 2 is set at a position where it protrudes slightly (about 1 mm) from the cassette 1. or 9
1st thing. Then, by running the magnetic tape at high speed in such a state and reproducing the control information signal, which is CTL coding data, with the reproducing head 10, an arbitrary address or index is detected, and the position of the desired recorded information on the magnetic tape 2-1 is detected. It is possible to accurately detect and stop tape running instantly, making it possible to stably perform high-speed cueing.

Further, although the reproducing head IO can be a wire-wound type head, if it is formed of a magnetoresistive element (hereinafter referred to as an MR element), even more reliable high-speed cueing becomes possible. That is, the wire-wound type head is a magnetic flux differential type head, and the output changes depending on the amount of change in magnetic flux, and the output changes depending on the running speed of the magnetic tape 2. Therefore, the tape running speed changes between the start and end of winding of the magnetic tape 2, and the output changes. For this reason, there is a limit to high-speed running speed. However, the head using the above-mentioned MR element is a magnetic flux response type head that changes depending on the magnitude of the magnetic field but does not depend on the amount of change in magnetic flux, so that a constant output can be obtained regardless of the speed of the magnetic tape 2. Furthermore, since it can be made smaller and lighter, it can be installed even in small spaces.

In the past, the A/C head 9 was used for both recording and playback, and stable recording was possible because the tape speed was low during recording, but when running at high speed, the magnetic tape 2 moved in the track width direction. If you try to play back with the same track width as the recording width, the output will decrease by the amount of the deviation in the track width direction, resulting in unstable output. However, according to the present invention, since the recording head and the reproducing head are provided separately, the track width W2 is increased by the amount of tape running deviation in the track width direction with respect to the CTL track width W1, as shown in FIG. (see FIG. 4(a)), or by making it smaller (see FIG. 4(b)), so that even if a deviation occurs, a constant track width can always be detected.
Stable output can be obtained. In the figure, 11 indicates a playback head track.

〔Effect of the invention〕

As described above, according to the present invention, since a dedicated reproducing head is provided to detect control information signals such as cueing signals recorded on a magnetic tape, the following effects can be achieved.

(I) Since the magnetic tape only comes into contact with a dedicated playback head during high-speed cueing, there will be no scratches on the magnetic tape or A.
/C Head wear is significantly reduced and malfunctions are prevented.

(11) Since the magnetic tape does not come into contact with the A/C head,
The load is small and it can run as fast as magnetic tape.

([II) The recording head that records the control information signal and the playback head that reproduces the control information signal recorded on the magnetic tape are separated, and the track width is changed by the deviation in the track width direction of the magnetic tape. It is possible to obtain stable output.

(TV) For the above reasons, reliability can be improved and costs can be reduced.

[Brief explanation of the drawing]

Fig. 1 is a configuration diagram showing an embodiment of the present invention, Fig. 2(a)
, (b) is an explanatory diagram showing how the track width of a magnetic tape is changed, FIG. 3 is a schematic configuration diagram of a conventional magnetic recording/reproducing device, and FIG. 4 is a configuration diagram showing a tape running path during conventional cueing. It is. 1-----VRT cassette 2...Magnetic tape 5.6...Guide post 7...Rotating drum 8...Full width 1h head 9・・・・・・Audio control head lO・
...ILF raw head applicant Canon Denryo Co., Ltd.

Claims (2)

[Claims] (1) A device for reading out control information from a magnetic recording medium having recorded information and control information related to the recorded information, comprising means for making the recording medium run at high speed, and a means for making the recording medium run at high speed. 1. A magnetic recording and reproducing apparatus comprising: magnetic head means for reading the control information by abutting on a surface opposite to the recording surface. (2) In the magnetic recording and reproducing apparatus according to claim 1, the recording medium is a magnetic tape, and the reproduction track width of the magnetic head means is set to a recording track of control information recorded on the magnetic tape. A magnetic recording/reproducing device characterized by having different widths.