JPS6079516A - Tracking device of magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To make the width of a signal track wide by providing two heads so as to be positioned between optional adjacent tracks, forming a control signal by comparing signal levels of both the heads which are reproduced, and correcting a tracking shift. CONSTITUTION:Two track shift detecting heads 11 are provided so as to be posi tioned between optional adjacent tracks on a straight line made by plural reproducing heads 4, a track shift detecting signal obtained from the two track shift detecting heads 11, 11 is processed by a tracking device, and a track shift is corrected automatically. That is to say, a signal detected by the track shift detecting head 11 is amplified by a preamplifier 12, and an output level is detected by a level detector 13.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a tracking device for a magnetic recording and reproducing device.
More specifically, the present invention relates to a tracking device for a magnetic recording/reproducing apparatus that records signals on multiple tracks on a magnetic tape and reproduces the signals from the tracks.

[Technical background of the invention and its problems]

In multi-track magnetic recording and reproducing equipment (flt), it is necessary to record many tracks within a narrow tape width.
It is necessary to narrow the width of one track. Therefore, tracking during playback greatly affects the quality of the playback signal. Particularly recently, technology has been developed to record and play back audio signals using PCM on compact cassettes, and in this case, 20 to 40
Since it is necessary to record tracks, the width of one track is approximately 50 to 100 μm, and in order to ensure the quality of the reproduced signal, restrictions on tracking deviation have become extremely strict. .

Conventionally, as a countermeasure against this problem, several devices have been considered that perform automatic tracking by detecting the track deviation and moving the playback head based on the detected track deviation.

FIG. 1 is a diagram for explaining a track deviation detection method of a conventional auto-tracking device.

Here, (1) is a magnetic tape, (2) is a recording head, and a plurality of them are arranged on a straight line. Further, (3) is arranged linearly in the tape width direction with a distance from the signal '. (5) is a track deviation detection head, and these two detection heads +5) and f5) detect track deviation. That is, when the head (2) records a signal, the head (6) simultaneously records the track (
A predetermined signal is recorded in 7), and during reproduction, track deviation is detected by the two track deviation detection heads (5) and (5). Based on this detection output, the position of the reproducing head group is changed to eliminate track deviation.

In this case, the magnetic tape (1) must be provided with a track (7) dedicated to detecting track deviation in addition to the signal track (3), and a dedicated recording head (6) for recording the track (7) must be provided. is necessary. A track dedicated to detecting track misalignment (if force is used, the width that can be used for recording and playback on the magnetic tape (1) is limited;
There is a phenomenon in which the output 9 decreases as it approaches the end face in the width direction, and νN deteriorates, and this part cannot be used for recording and reproduction. However, when the width of the signal track (3) is narrowed, the output decreases and /N becomes worse, which is disadvantageous. .

FIG. 2 is a diagram for explaining another example of the conventional track deviation detection method. In this case, the track deviation detection dedicated track (n+necessary) is because the track deviation detection head (5) is adjacent to the reproduction head (4) for reproducing the signal track (3).

There is a problem in that the manufacturing process for the portion including the reproducing head (4) and the track deviation detection head (5) is complicated.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned points, and is used in a magnetic recording/reproducing device in which a plurality of tracks are formed in the width direction of a tape, without the need for a dedicated track for detecting track misalignment, and for detecting playback head and track misalignment. It is an object of the present invention to provide a tracking device for a magnetic recording/reproducing device that is practical and has a simple manufacturing process for a portion including a head.

[Summary of the invention]

The present invention provides a multi-track magnetic recording and reproducing apparatus in which a plurality of recording heads (referred to as a recording head group) and a plurality of reproducing blades (referred to as a reproducing head group) are arranged in a straight line, When a track recorded by a recording head is reproduced by a reproducing head, two heads for detecting tracking deviation are placed between arbitrary adjacent tracks, and both signals reproduced by the detection head are The levels are compared, a control signal is formed based on the compared signal, and the control signal drives a head movement means provided in the reproducing head to displace the mechanical position of the reproducing head. This effectively corrects tracking deviation. 1 [Embodiment of the Invention] Hereinafter, an embodiment of a tracking device for a magnetic recording/reproducing apparatus according to the present invention will be described with reference to the drawings.

FIG. 3 is a diagram showing an embodiment of the track deviation detection portion of the tracking device of the present invention. . (1) is a magnetic tape, (2) is a recording head, and (3) is a signal track.

(4) is a playback head. Then, two track deviation detection heads aυ are arranged to be positioned between arbitrary adjacent tracks on a straight line formed by a plurality of read heads (4) (referred to as a read head group). In this figure, the track deviation detection signals obtained from the two track deviation detection heads Q1), <11) are processed by the trunking device shown in the block diagram of FIG. 4, and the track deviation is automatically corrected.

That is, the signal detected by the track deviation detection head aυ is amplified by the preamplifier a, and the output level is detected by the level detector (131).The detected output level is input to the differential amplifier 1. death.

The output is passed through the control signal generator a9 to generate a control signal, which is then input to the electro-mechanical transducer αD through the amplifier 1 [9]. Correct it accordingly.

The recording head (2) used here may be either a conventional nok head or a thin film magnetic head, and the reproducing head (4) may be used.
) and track misalignment detection head (11) are conventional bulk heads, thin film magnetic heads, and M
Any R head may be used.

The electro-mechanical conversion elements used here include those that use a movable gland ring (voice coil), those that use a piezoelectric effect, and those that can produce mechanical displacement by applying electrical input, such as a motor. Either one is fine if you have it.

〔Effect of the invention〕

As described above, the auto-tracking device configured according to the present invention does not require a dedicated track for detecting track deviation, and the width of the signal track can be widened accordingly, thereby improving the quality of recording and reproducing signals as a whole.

Furthermore, since the reproducing head and the track deviation detection head can be configured to be aligned in a straight line, the manufacturing process for this part is simplified and the fractional yield is improved.

[Brief explanation of drawings]

FIG. 1 is a diagram for explaining the track deviation detection method of a conventional auto-tracking device, FIG. 2 is a diagram for explaining another conventional trunk deviation detection method, and FIG. 3 is a diagram for explaining the magnetic recording according to the present invention. FIG. 4 is a diagram showing an embodiment of a track deviation detection section of a tracking device of a playback device, and FIG. 4 is a block diagram showing an embodiment of the tracking device of the present invention. l...magnetic tape, 2... recording head. 4...Playback head. 11...Track deviation detection head. 14... Comparator, 15... Control signal former. 17...Electro-mechanical conversion element. 18... Playback head section. Agent Patent attorney Tosuke Norichika (and 1 other person) Figure 1 Figure 3 Figure 4 Figure Q

Claims (1)

[Claims] A recording head group consisting of a plurality of recording heads arranged linearly in the width direction of a running magnetic tape performs multi-track signal recording, and the recording heads are arranged linearly in the width direction of the tape. In a tracking device for a magnetic recording and reproducing device that performs reproduction with a reproduction head group consisting of a plurality of reproduction heads, a head moving means for moving the reproduction head group in the width direction of the tape, and a head moving means located between arbitrary adjacent tracks. Two heads for tracking deviation detection are arranged as follows. It comprises a comparator for comparing the reproduction signal output levels obtained from these two heads, and means for forming a tracking control signal for the reproduction head group based on the output signal from the comparator, and the control signal forming means A tracking device for a magnetic recording/reproducing device, characterized in that a head moving means is driven by the output of the magnetic recording/reproducing device.