JPS58171702A - Magnetic recording information reproducing device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for reproducing information recorded on a magnetic disk, magnetic tape, etc. using a reproducing head.

Conventionally, in a generally known magnetic recording information reproducing device, the recording head and the reproducing head are the same, and therefore the recording tracks formed on a magnetic recording medium such as magnetic tape or magnetic tape cannot be reproduced. Since the reproducing heads of the same width trace, so-called track misalignment has become a problem when reproducing bulk density recording. This track deviation occurs due to eccentricity during recording and reproduction, insufficient tracking performance, etc., but crosstalk from adjacent tracks becomes a major problem, especially during reproduction of high-density recording.

An object of the present invention is to solve these drawbacks in a magnetic 8[4 recorded information reproducing device, without requiring strict tracking accuracy, and to eliminate crosstalk from adjacent tracks.

That is, the feature of the present invention is that in a magnetic recording information reproducing apparatus, in which a signal recorded on a track 61' on a magnetic d-pi recording medium is reproduced by a reproducing head, 1- of the front d-pi reproduction head is at an angle. It is narrower than the length of a single player's track, and it is 1 for two pairs of tracks on a magnetic recording medium! e
The recorded signal is reproduced using two playback heads placed side by side (hereinafter F2 track 2 head Niu method). In addition to being narrower, the center-to-center dimension of the reproducing head in the width direction is larger than the center-to-center dimension of the two trunks in the width direction.

With the playback device of the present invention having such features, crosstalk from adjacent tracks does not occur in the playback signal even if one tracking ball for a high-quality medium is relatively fluffy. This method greatly contributes to simplifying the mechanism of the playback device by providing a considerable amount of margin against mechanical tracking.

If this invention is explained in detail in conjunction with Figure (3), the above is as shown in σ).

Diagram 1 structurally omits the H track and the positioning distance vr of the playback head for it;
L head width (Wk□) and gty M) rack @(
A conventional field 6 is shown where WT) is equal. Figure 1 (
a) IIC hey (z1 on the 1st elephant track (6)
There is no problem when the playback head is in position (1), but
When the playhead is in position (2), the gartband (
4) and straddles the adjacent track 15) (6)
) occurs, and from this part (6 to the adjacent track (61 of 51
4, and this becomes a crosstalk signal from the adjacent track. In this example, a guard band (4) is shown, but in the case of high-density recording, this card band (4) may have an even narrower width, or may not exist at all. The part that overlaps the track (G becomes large, and as a result, the tarostalk from the adjacent track becomes impossible to ignore. To prevent this, for example, tracking with electrical servo control, etc.) - Power This invention - 0 is to make the first floor (W, () of the playback head narrower than the track width (W, ,) as shown in Figure 1 (b), and therefore the current When the endogenous head is at position (7), that is, when the playback head is at position If L-C at the center of the track widthwise, by setting WT>WH, it is possible to There is ample margin for tracking deviation of the playback head for playback.For this reason, even if the playback head deviates from the playback position during playback (8) or (9), the 1111i contact trunk (51 Therefore, crosstalk-free playback can be achieved with a rough tracking degree, and the servo system for tracking can be simplified.

Figure 2 (a) shows an example in which the present invention is applied to a 2-track, 2-head reproducing system. , two juxtaposed playback heads (12) (1
5) The center-to-center dimension in the width direction (DH) is track (10)
(1110-) is made equal to the center-to-center dimension in the j direction (DT).

(Direction, the playback head (1)) (15) is arranged with the track force direction difficult, and -C is also useful.) In this case as well, tracking of the valley playback head with t) and (-iJ) of both tracks For Q', -(track 1 chest (wT) and head 4ii
It goes without saying that the difference with ii (WT) is due to a considerable amount of extra lees.

By the way, in order to record high crystallinity in the 2-track 2-head playback system, it is not known in history whether the guard band (4) between the two tracks (10) and (11) in a set should be narrowed. In the case where a sufficient guard punt is provided between this set of two tracks and another set of two tracks adjacent to this set of two tracks, in the method shown in FIG.
10) The tracking margin for crosstalk in (11) is still insufficient. In order to deal with such a case, in the present invention, as shown in FIG. 2(b), the widthwise center-to-center dimension (DH) of the two reproducing heads (14) and (15) is set to the two tracks (10) ( 11) is larger than the center-to-center dimension (DT) in the width direction. In this case, the guard band (4) between both tracks (1o) (11)
is small or not present at all. Also, the card band (16) between the other two track sets is set sufficiently wide. Therefore, by setting DtI>I)T, WT>W
H's! +! In conjunction with f characteristics, one playback head (14)
track deviation to track (11) 0111, or track (10) full of the other playback head (15)
Due to the track deviation from 7.1, a larger gold phase appears than in the case of Figure 2 (a).

For example, in the case of Fig. 2, henototooking fC is
When a tracking error occurs, both playback heads (one
2+ (15) both tracks (10) (11
), a tracking deviation of the same amount of 1- will occur, but for the tracking deviation of the width created by setting DH>DT as shown in Fig. 2(b), as shown in Fig. 3(b).
As shown in , one of the playback heads (14) will cause tracking deviation first, so tracking servo is performed by comparing the respective levels of the Takao signal from both playback heads (14) and (15). Servo control is possible with a simple method. Similarly, such a 2-track 2-head reproducing force type can be applied to magnetic recording and reproducing of still images, for example, where 2 fields constitute 1 frame, and especially between 2-track sets for 1 frame, each other's ILII is A card pad is provided to ensure the independence of 7H, and there is a close correlation between the 2 tofusoku in one frame. It is effective to give some space to the armpits of the head (8).

As mentioned above, in this method, the width of the playback head is narrower than the track width, so crosstalk from adjacent tracks can be suppressed without requiring strict tracking accuracy. In the case of playback using a head, there are historically two playback head widthwise center-to-center dimensions, fJ
By making the size larger than the same size in the width direction of the two tracks forming a pair, the tracking margin against crosstalk is increased. Therefore, the configuration of the mechanical tracking mechanism of the playback head and its servo system etc. is simplified. It is possible.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing the recording track and the arrangement relationship of the book I4□-\gutter with respect to the recording track, and FIG. 1(a) shows the 4JE conventional example, and FIG. 1(b) shows the example of the present invention. Section 2 1(a) is a schematic diagram showing an example of the present invention in a 2-track 2-head playback system, FIG. b) is shown in Figure 2(a) ('b
) is a schematic diagram showing the relationship between each tracking deviation. 111 (21(7) (8) (9): Position of playback head, (6th: d1 trace trunk at birth 7.1, (4
) Two-card band, (5: 14-touch tofunoku, (10)
(11): Two tracks that become silk, (12+ (1
6) (14) (1ri): Playback head, (161 Niggard Panod. Agent Masuji Sanro Kimura)

Claims (1)

[Claims] (1) A magnetic recording information reproducing apparatus which uses a reproducing head to reproduce a signal recorded on a track on a magnetic recording medium, in which the width of the reproducing head is narrower than the width of the track. Q) In a device in which signals recorded on a pair of two tracks on a magnetic recording medium are reproduced using two reproducing heads, the width of each reproducing head is narrower than the - of each opposing track, and both inner A magnetic recording information reproducing device in which the center-to-center dimension in the width direction of the head is larger than the center-to-center dimension in the width direction of the two tracks.