JP2001076303A - Magnetic recording and reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make standard or double and triple special reproducings performable by recording video signals by a pair of head pairs D of a head group A having head widths that are wider than the track pitch of a recording in a long duration recording mode, recording FM audio signals by a head pairs B having specific head widths and reproducing video signals, which are recorded in a long duration recording mode, by head pairs C in a dedicated manner. SOLUTION: The device has the head group A that is more than one set of head pairs for mainly recording and reproducing video signals and special reproducing and head pairs B that mainly record and reproduce audio signals corresponding to double or triple long duration recordable recording mode to a standard recording mode. Moreover, head pairs C are provided to reproduce video signals in a more than five fold long duration recording mode. The head pairs B have a head width Twb in which 2×Px<Twb<3×Px is satisfied for track pitch Px in a more than five fold long duration recording mode. Furthermore, the center of the head width of the head pairs C is set so that the center does not simultaneously trace prescribed two places during a reproducing in a more than five fold long duration recording mode.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording / reproducing apparatus having a long-time recording mode which is at least five times longer than a standard recording mode.

[0002]

2. Description of the Related Art In recent years, the cost of magnetic recording / reproducing apparatuses has been reduced and the running cost of magnetic tapes has been required to be reduced. However, to increase the recording time, the standard mode and the recording mode that can record twice or three times longer than the standard mode (hereinafter, the mode that can record twice as long as the standard mode, the double mode, and the triple time recording) 3x mode, similarly 4x mode,
These are referred to as a 5 × mode and a 6 × mode. ) Was only introduced into the market.

Hereinafter, a conventional magnetic recording / reproducing apparatus will be described.

Conventionally, a magnetic recording / reproducing apparatus capable of recording / reproducing in a 6-times mode as long-time recording of 5 times or more is disclosed in Japanese Patent Application Laid-Open No. 7-73405. The magnetic recording / reproducing apparatus is shown in FIG. 4 and FIG. 4 and 5 are schematic explanatory views showing the configuration of a rotary head of a conventional magnetic recording / reproducing apparatus. A small circle on a large circumference indicates a mounted head. In FIG. 4, a single head pair 5 (5R, 5L) for the standard mode having a head width slightly smaller than twice the track pitch in the triple mode.
And a triple mode head pair 7 (7R, 7L) having a head width substantially equal to the track pitch in the triple mode,
And a 6 × mode head pair 6 (6R, 6R) having a head width slightly smaller than twice the track pitch in the 6 × mode.
6L) and a head 4 (4R, 4L) for audio used in all modes.

The operation of the conventional magnetic recording / reproducing apparatus configured as described above will be described below.
The description will be made according to that described in Japanese Patent No. 73405.

First, the single head pair 5 performs recording / reproduction in the standard mode and compatible reproduction in the triple mode. The head pair 7 performs recording / reproduction in the triple mode, has a track width slightly smaller than twice the recording track pitch in the six times mode, and sets the azimuth angle between ± 0 degrees and ± 20 degrees. The 6 × mode head pair 6 performs recording and reproduction in the 6 × mode.

[0007] The special reproduction in the standard mode, the 3x mode, and the 6x mode is complemented by a digital circuit using a field memory.

Next, the configuration of the head shown in FIG. 5 will be described. Of the four heads of the double azimuth system composed of 1R, 1L, 9R, and 9L, 1R and 1L are head pairs used for recording and reproduction in the standard mode, and are referred to as head pair E. Reference numerals 9R and 9L denote a head pair F which is a pair of heads used for recording / reproduction in the triple mode. Generally, the head width of each head is 49 μm for head E and 26 μm for head F.
The degree is chosen. 8R for recording and playback for 6x mode
, And 8L, which are referred to as a head pair G. The head width of the head pair G is set to be slightly smaller than twice the track pitch of six times. Further, a head pair consisting of 4R and 4L is referred to as a head pair B, and the head pair B is HiFi.
A pair of heads for audio, which are commonly used for recording and reproduction in three standard, three times and six times modes. Generally, a track width of 26 μm to 30 μm is selected in consideration of compatible reproduction. The head pair E and the head pair F perform compatible reproduction of the standard mode and the triple mode, recording and reproduction of the standard mode, and special reproduction of both modes. At the time of normal reproduction in the triple mode, the head pair G is used so that crosstalk from an adjacent track does not occur.

[0009]

However, in the configuration shown in FIG. 4, as described in Japanese Patent Application Laid-Open No. 7-73405, during special reproduction in all modes, the video signal after the reproduction signal output is FM-demodulated. A digital circuit having a field memory for storing one field and the low-frequency conversion color signal is required, resulting in a high cost.

In addition, it is necessary to newly manufacture four heads having a head having a different azimuth angle from the conventional head and a normal head having a narrower track pitch for the standard mode than the conventional one. However, the problem that the cost burden is large is expected.

Further, in the configuration shown in FIG. 5, a 6 × mode head pair G is used as a reproducing head in order to prevent crosstalk during 3 × mode recording / reproduction, but on the other hand, there is a problem that the output is lower than in full track reproduction. .

4 and FIG. 5 are common points.
A head set to a head width slightly smaller than twice the double track pitch performs recording / reproduction exclusively in the 6 × mode. This is because recording and reproduction are performed by the same head, so that the head width must be wider than the track pitch in order to eliminate unerased HiFi audio during recording, while in order to eliminate crosstalk from adjacent tracks during reproduction. Has the dilemma that it needs to be narrower than the track pitch. At the same time, there is also a problem that the sound quality of the HiFi audio is remarkably deteriorated, or a margin for compatible reproduction of the HiFi audio signal in the standard mode or the triple mode is significantly reduced. This point is not discussed in JP-A-7-73405.

This point will be described with reference to FIG. FIG. 6 is a diagram conceptually showing how a head of a conventional magnetic recording / reproducing apparatus traces a recording track. P1, P2, P3, and P4 are HiFi audio and video signal tracks in the 6 × mode, and have a pitch of 9.6 μm.
P1 and P3 and P2 and P4 have the same azimuth.

Although the HiFi audio track and the video track do not always match, it is assumed here that they match to simplify the description. The head B is a pair of HiFi heads for performing recording and reproduction in the standard triple and six times modes, and FIGS.
Is a head pair B composed of 4L and 4R, and the head width thereof is generally selected from 26 μm to 30 μm in consideration of compatible reproduction as described in JP-A-7-73405. Here, description will be made assuming that the thickness is 26 μm. The G head is a video head that performs recording and reproduction in the 6 × mode.
5 is a head pair G composed of 8L and 8R.

The head width (Twg) of the head pair G is set to a width (less than 19.2 μm) slightly smaller than twice the track pitch of six times.

Referring to FIG. 6, sound is recorded by a head B. Since the head width of the head B is wider than the recording track of 9.6 μm in the 6 × mode, the relationship between the head and the recording track as shown in FIG. 6 is obtained. Similarly, since the video signal is recorded by the head G having a head width wider than the track pitch, the positional relationship between the head G and the recording track as shown in FIG. 6 is obtained. Next, at the time of reproduction, when the audio head B traces the track P2 when tracing the track P4 having the same azimuth with respect to the track P2, remarkable deterioration of sound quality is caused. The recording tracks two tracks behind P2 are the same azimuth (hereinafter referred to as adjacent tracks; in FIG. 6, the adjacent tracks of P2 are P4. The adjacent recording tracks are also referred to as adjacent tracks. The adjacent tracks are P1 and P3). The most affordable position to avoid tracing adjacent tracks,
That is, (26 μm−9.6 μm) from the recording position such that the center of the P2 track and the center of the center of the head B overlap.
m) /2=8.2 μm and the control result is B ′
Becomes This eliminates the influence of intense crosstalk from adjacent tracks. However, when the head B is displaced by 8.2 μm, the G head of the image is also displaced by 8.2 μm. Therefore, since the G head originally wants to trace the track of P2, the head width of the G head needs to be increased by 8.2 μm. . Then, the G head reproduces a normal signal of 9.6 μm from the track P2 and simultaneously receives crosstalk from the adjacent track P1 of 8.2 μm. This means that the head pair 7 in which the azimuth angle is changed must be affected by the image quality deterioration. Conversely, if the width of the head B is reduced so that the head B is not affected by the azimuth track P4, it is difficult to guarantee the compatibility of the FM sound especially in the standard mode.

The present invention solves the above-mentioned conventional problems, and prevents the HiFi head from picking up adjacent tracks in a long-time recording mode of 5 times or more without reducing the track pitch of the HiFi head. Provides sound quality,
Also, it is an object of the present invention to provide a magnetic recording / reproducing apparatus which provides good image quality without crosstalk from an adjacent track for a video and also enables special reproduction of a standard mode and a triple mode without using a field memory as before. Aim.

[0018]

In order to achieve this object, a magnetic recording / reproducing apparatus according to the present invention comprises a standard recording mode and a recording mode capable of recording twice or three times as long as the standard recording mode. And a magnetic recording / reproducing apparatus having a head group A composed of one or more head pairs mainly used for recording / reproducing and special reproduction of video signals and a head pair B mainly used for recording / reproducing audio signals. The apparatus includes a pair of heads C used to reproduce a video signal in a long-time recording mode of 5 times or more, and
Track pitch Px in long time recording mode more than double
2 × Px <Twb <3 × Px
b, and at the time of reproduction of the long-time recording mode of 5 times or more,
When the center of the head width of the head pair C traces the center of the recording track of the video signal recorded by the head group A, all the azimuth recording tracks of the audio signal recorded by the head pair B are traced; There is a configuration in which the head pair C is arranged so that two places are not traced simultaneously at a place where the video signal is recorded only once later by the head group A in an adjacent track of the reverse azimuth to be traced extra. are doing.

With this configuration, a conventional double azimuth type four head and HiFi head can be used. Therefore, the recording / reproduction and the special reproduction in the standard mode and the double or triple mode can be performed as before, and the reproduction signal output is set to F.
A digital circuit having a field memory for storing the video signal after M demodulation and the low-frequency converted color signal in one field is unnecessary, and the cost burden is small.

Further, since the newly added head pair C has the same azimuth angle as the conventional one, the investment in the plant equipment can be reduced.

Further, a dedicated head pair C is provided during reproduction in the long-time recording mode of 5 times or more, and the same full-track reproduction as in the prior art is performed in the 3 times mode recording / reproduction, so that the output does not decrease.

In this way, it is possible to provide good sound without the influence of adjacent tracks and good image quality without crosstalk from adjacent tracks during reproduction in the long-time recording mode of 5 times or more.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention corresponds to a standard recording mode and a recording mode capable of recording twice or three times as long as the standard recording mode. A head group A composed of one or more head pairs used for recording / reproduction and special reproduction of a video signal,
A magnetic recording / reproducing apparatus having a head pair B mainly used for recording / reproducing an audio signal includes a head pair C used for reproducing a video signal in a long-time recording mode of 5 times or more, and the head pair B is 2 × Px <Twb <3 with respect to track pitch Px in a long time recording mode of 5 times or more
A head width center of the head pair C traces the center of a recording track of a video signal recorded by the head group A during reproduction in the long-time recording mode having a head width Twb of × Px and five times or more. In addition, all the azimuth recording tracks of the audio signal recorded by the head pair B are traced, and the video signal is recorded only once later by the head group A in the adjacent track of the reverse azimuth traced extra. The head pair C is arranged so that two locations are not traced at the same time. When recording for a long time of 5 times or more, the head width surely becomes 5 times or more for a long time. Video is recorded by a pair of heads in head group A having a head width wider than the track pitch, and FM audio is recorded by head pair B, and is erased by a video signal of FM audio. By using the head pair C as a dedicated head for reproducing a video signal in a long-time recording mode of 5 times or more, head group A which is the same as a conventional magnetic recording / reproducing apparatus without a 5 times or more long-time recording mode is used. , And the special reproduction of 2 times or 3 times the standard is possible. Also, during playback in a long-time recording mode of 5 times or more, a head C provided exclusively for playback of video signals is provided.
When the head width center is traced by matching the center of the video track recorded regardless of the head width, all the azimuth recording tracks of the audio signal recorded by the head pair B are traced, and extra For the portion where the video signal was recorded only once later by the head group A in the track adjacent to the reverse azimuth to be traced,
By arranging the head pair C so as not to trace the points at the same time, the head pair B has a low probability of tracing the adjacent tracks when tracing the HiFi audio track. Means that traces of one portion of the portion having a large noise component are not traced at two portions, so that not only the influence of the adjacent tracks is small but also a good sound with little influence of the adjacent tracks can be obtained. Has an action.

According to a second aspect of the present invention, there is provided a long-time recording mode in which the head width Twd of the pair of heads D used for recording in the long-time recording mode of five times or more in the head group A is five times or more. Twd <2 × Px with respect to the track pitch Px
This makes it possible to suppress overwriting of the same azimuth by the head D during long-time recording of 5 times or more, thereby suppressing image quality deterioration due to overwriting of video signals. Has the effect of being able to.

The third aspect of the present invention is characterized in that the relationship of Twc ≦ Px is established with respect to the track pitch Px in the long-time recording mode in which the head width Twc of the head pair C is five times or more. This has an effect that a video signal with little crosstalk effect from an adjacent track can be obtained during reproduction in the long-time recording mode of 5 times or more.

An embodiment of the magnetic recording / reproducing apparatus according to the present invention will be described below with reference to FIGS.

(Embodiment 1) FIG. 1 is a diagram showing a head configuration of a magnetic recording / reproducing apparatus according to Embodiment 1 of the present invention. Small circles (1R, 1L, 2R,
2L, 3R, 3L, 4R, 4L) indicate heads, respectively. First, a head group A is composed of 1R, 1L, 2R, and 2L, which are four heads of a double azimuth system. The head pair 2R and 2L in the head group A is called a head pair D. The head width (Twd) of the head pair D is Tw
The relationship is set to d <2 × Px. Where Px is 5
This is the track pitch in the long-time recording mode which is twice or more.

Next, a head pair consisting of 4L and 4R is called a head pair B. The head width (Twb) of the head pair B is 2 × P
x <Twb <3 × Px.

Next, a head pair composed of 3R and 3L is called a head pair C. The head width (Twc) of the head pair C is Twc
≤Px is set.

The operation of the magnetic recording / reproducing apparatus having the head configuration as described above will be described. The head group A is a head used for recording and reproduction of images in the standard mode and double or triple mode, and the head group B is a head pair B in all modes of standard, double, triple and five times or more.
The head pair C is a head used for recording and reproduction of M audio and special reproduction, and the head pair C is a head used only for reproducing a video signal in a long time mode of 5 times or more, and the head pair D is a head for 5 times or more of long time recording. Record video. Here, the recording and reproduction and the special reproduction of the standard and double and triple video and audio are well-known technologies, and will not be discussed here.

Next, the operation at the time of long-time recording of 5 times or more will be described with reference to FIG. FIG. 2 is a diagram conceptually showing how the head of the magnetic recording / reproducing apparatus according to the first embodiment of the present invention traces a recording track in a long time mode of 5 times or more. The audio heads AL and AR are a pair of heads B and correspond to 4R and 4L in FIG. 1, and record and reproduce FM sound. The video heads L and R are a head pair D, 2L in FIG.
And 2R, and performs video recording during long-time recording of 5 times or more. The video heads XL and XR are a head pair C and correspond to 3R and 3L in FIG. 1, and are video reproduction dedicated heads used only in reproduction of a long time recording mode of 5 times or more. The shift distance from AL to AR in the horizontal direction in the figure is the track pitch Px. Also, the azimuth direction is schematically depicted on the recording tape pattern.
The adjacent tracks have reverse azimuth, and the adjacent tracks have the same azimuth. This example shows a case where the HiFi audio track and the video track are shifted.

In FIG. 2, the recording of the sound is performed by the head B. The head width Twb of the head B is 2 × Px <Tw
Since b <3 × Px, the relationship between the head and the recording track as shown in FIG. 2 is obtained. Recording of an image is performed by the head pair D. The head width Twd of the head pair D is Twd <2 × P
x and Px <Twd, as shown in FIG. 2, a portion where the video signal is recorded only once after (one-time eraser) and a portion where the video signal is recorded twice after (two times) Eraser). When recording, there is no effect on adjacent tracks that are the same azimuth. In other words, the azimuth is not overwritten.

Next, at the time of reproduction in the long-time recording mode of 5 times or more, for example, auto-tracking is operated so that the reproduction output of the head pair C is maximized. Since the head C is set so that the head width Twc ≦ Px, only the signal of the video track can be traced, and a reproduced video signal which does not receive any crosstalk from the video of the adjacent track of the video can be obtained. . This makes it possible to make the center of the head C and the center of the video track overlap during reproduction in the long-time recording mode five times or more.

Here, the physical positional relationship between each head pair will be described with reference to FIG. FIG. 3 is a schematic diagram showing the mounting height of each head pair. The vertical axis represents the mounting height of the head.
The horizontal axis indicates the outer circumferential direction of the rotary head cylinder. Each head pair has about 60 on the rotating head cylinder as shown in FIG.
Installed at intervals of degrees. When the tape is running, an interval of 180 degrees on the rotary head cylinder corresponds to a deviation of one track pitch. Therefore, for example, at an interval of 60 degrees, the shift is 1/3 of the track pitch. In order to cause any deviation between the heads, it is necessary to adjust the mounting height of the heads thereafter. In FIG. 3, the head pair B (A
R, AL) is higher in mounting position by A than head pair D (R, L), and head pair C (XR, XL) is lower in mounting position by B than head pair B (AR, AL). Show.

With this configuration, when the head C traces a video track, the audio head B is shifted to a position determined by the head interval on the rotary head cylinder and the amount indicated by B in FIG. For this reason, all the azimuth recording tracks of the audio signal recorded by the head pair B are traced, and a portion where the video signal is recorded only once later by the head group A in the adjacent track of the reverse azimuth traced extra. The head pair C is arranged so as not to trace at two places at the same time. It is noted that the noise component at the portion where the video signal is recorded only once after (the once erased portion) is larger than the noise component at the portion where the video signal is recorded twice later (the twice erased portion). Have been. As a result, when tracing the HiFi audio track, the head pair B has a low probability of tracing the adjacent track, and when tracing the adjacent track, the head pair B has a large noise component even when tracing one location. Since the portion is not traced, it is possible to obtain not only the effect of the adjacent track but also a good sound with little influence of the adjacent track. As a result, similarly to the case where the head C is shifted, both the head B and the head D are shifted by the same distance. The head C is not used for recording.

In addition, a conventional double azimuth type four head and a HiFi head can be used. Therefore, recording / reproduction and special reproduction in the standard mode and double or triple mode can be performed as before, and a field memory for storing one field of a video signal and a low-frequency conversion color signal after FM demodulation of a reproduction signal output. The digital circuit having is unnecessary and the cost burden is small.

Further, since the newly added head pair C also has the same azimuth angle as the conventional one, the investment in plant equipment can be reduced.

Further, a dedicated head pair C is provided during reproduction in the long-time recording mode of 5 times or more, and the same full-track reproduction as in the prior art is performed in the 3 times mode recording / reproduction, so that the output does not decrease.

As a long-time recording mode of 5 times or more, the 5 times mode is practical, but this will be described. The five-fold mode is practical for the following reasons. In the VHS system (trademark of Victor Company of Japan), the track pitch in the standard mode of the NTSC system is 58 μm. Head D is 3
Both the double mode and the N mode are used at the time of recording. The track pitch P3 in the triple mode is 58 μm / 3 = 19.3 μm. Therefore, the head width Twd of the head D must be 19.3 μm or more. On the other hand, the track pitch in the N-times mode is 58 μ
m / N. The head width Twd of the head D must be Twd <2 × 58 / N in order to suppress the image quality deterioration due to the overwriting of the video signal and avoid the overwriting of the same azimuth by the head pair D during the N-times mode recording.

Therefore, 19.3 μm ≦ Twd <2 × 58 μ
The integer N that satisfies m / N is less than 6. The maximum value of the integer N is 5 in consideration of mechanical variations. That is, 5
Double mode is practical.

The maximum value of the integer N is 5 on condition that the head D is also used for the triple mode recording / reproduction. However, if the head D is not used for the triple mode recording / reproduction, the value of Twd is high. It is possible to further reduce the minimum value. At this time, it goes without saying that the possible value of N can be larger than 5.

As described above, according to the first embodiment, 5
When recording in the long-time recording mode, the head width is surely larger than the track pitch in the long-time recording mode in which the head width is 5 times or more. In addition, by using head pair B to record FM audio and using head pair C as a head dedicated to reproducing video signals in a long-time recording mode of 5 times or more, a conventional magnetic disk having no 5 times or more long-time recording mode is provided. It is possible to have the same configuration of the head group A as that of the recording / reproducing apparatus.
Double or triple special playback is possible.

Further, all the azimuth recording tracks of the audio signal recorded by the head pair B are traced, and the video signal is recorded only once later by the head group A in the adjacent track of the reverse azimuth traced extra. By arranging the head pair C so as not to trace two places at the same time, the head pair B
When tracing an audio track, the probability of tracing adjacent tracks is low, and when tracing adjacent tracks, even if one location is traced at a location where the noise component is large, two locations are not traced. A good sound can be obtained which is not only less affected by the adjacent track but also less affected by the adjacent track.

Further, there is no need for a digital circuit having a field memory for storing one field of the video signal after the reproduction signal output is FM-demodulated and the low-frequency converted chrominance signal, thereby reducing the cost burden.

Further, since the newly added head pair C has the same azimuth angle as the conventional one, the investment in the plant equipment can be reduced.

Further, a dedicated head pair C is provided during reproduction in a long-time recording mode of 5 times or more, and the same full-track reproduction is performed as in the conventional case in 3 times mode recording / reproduction, so that the output does not decrease.

In addition, the head width T of the head pair D used for recording in the long-time recording mode that is five times or more in the head group A is used.
Track pitch P in long-time recording mode where wd is 5 times or more
The relation of Twd <2 × Px with respect to x makes 5
Since overwriting of the same azimuth by the head D is not performed at the time of recording for twice or more times, deterioration of the image quality due to overwriting of the video signal can be suppressed.

Further, by setting the relation of 2 × Px <Twb <3 × Px with respect to the track pitch Px in the long time recording mode in which the head width Twb of the head pair B is 5 times or more, the double mode or 3 × Px is set. It is possible to control the head pair B so as not to trace adjacent tracks during reproduction in the long-time recording mode of 5 times or more while guaranteeing compatible reproduction in the double mode.

The track pitch Px in the long time recording mode in which the head width Twc of the head pair C is 5 times or more is T
By setting the relationship of wc ≦ Px, it is possible to obtain a video signal with little influence of crosstalk from an adjacent track during reproduction in the long-time recording mode five times or more, and to provide good image quality.

[0050]

As described above, the present invention has a head width that is wider than the track pitch during recording in the long-time recording mode in which the recording is performed in the long-time recording mode in which the recording is performed five times or more. A head pair D of head group A records video and a head pair B records FM audio, and head pair C is used as a head dedicated to reproducing video signals in a long-time recording mode of 5 times or more. It is possible to have the same configuration of the head group A as a conventional magnetic recording / reproducing apparatus which does not have a long-time recording mode of 5 times or more, and it is possible to perform special reproduction twice or three times as standard. Is obtained.

Further, all the azimuth recording tracks of the audio signal recorded by the head pair B are traced, and the video signal is recorded only once later by the head group A in the adjacent track of the reverse azimuth traced extra. By arranging the head pair C so as not to trace two places at the same time, the head pair B
When tracing an audio track, the probability of tracing adjacent tracks is low, and when tracing adjacent tracks, even if one location is traced at a location where the noise component is large, two locations are not traced. An excellent effect that not only the influence of the adjacent track is small but also a good sound with little influence of the adjacent track can be obtained.

Further, a digital circuit having a field memory for storing one field of the video signal after the reproduction signal output is FM-demodulated and the low-frequency conversion chrominance signal is unnecessary, and an excellent effect that the cost burden is reduced is obtained. Can be

Further, since the newly added head pair C is also formed with the same azimuth angle as the conventional one, an excellent effect that the investment in plant equipment is reduced can be obtained.

Furthermore, a dedicated head pair C is provided during reproduction in a long-time recording mode of 5 times or more, and the same full-track reproduction as in the prior art is performed in 3 times mode recording / reproduction, so that the output is not reduced. The effect is obtained.

Further, the head width T of the head pair D used for recording in the long-time recording mode of 5 times or more in the head group A is used.
Track pitch P in long-time recording mode where wd is 5 times or more
The relation of Twd <2 × Px with respect to x makes 5
Since overwriting of the same azimuth by the head D is not performed at the time of recording over twice as long, an excellent effect that image quality deterioration due to overwriting of the video signal can be suppressed can be obtained.

Further, by setting the relation of 2 × Px <Twb <3 × Px with respect to the track pitch Px in the long time recording mode in which the head width Twb of the head pair B is 5 times or more, the double mode or 3 × Px is set. An excellent effect is obtained in that the head pair B can be controlled so as not to trace adjacent tracks during reproduction in the long-time recording mode of 5 times or more while guaranteeing compatible reproduction in the double mode.

The track pitch Px in the long-time recording mode in which the head width Twc of the head pair C is 5 times or more is T
By setting the relation of wc ≦ Px, an excellent effect that a video signal with less influence of crosstalk from an adjacent track can be obtained and a good image quality can be provided at the time of long-time recording mode reproduction of 5 times or more can be obtained.

[Brief description of the drawings]

FIG. 1 is a diagram showing a head configuration of a magnetic recording and reproducing apparatus according to a first embodiment of the present invention.

FIG. 2 is a diagram conceptually showing how a head of the magnetic recording / reproducing apparatus according to Embodiment 1 of the present invention traces a recording track.

FIG. 3 is a schematic diagram showing a mounting height of each head pair of the magnetic recording and reproducing apparatus according to the first embodiment of the present invention.

FIG. 4 is a schematic explanatory view showing a head configuration of a conventional magnetic recording / reproducing apparatus.

FIG. 5 is a schematic explanatory view showing a head configuration of a conventional magnetic recording / reproducing apparatus.

FIG. 6 is a diagram conceptually showing how a head of a conventional magnetic recording / reproducing apparatus traces a recording track.

[Explanation of symbols]

 1 Head for standard mode 2 Head for 2 or 3 times mode 3 Head for exclusive use in long-time recording mode of 5 times or more 4 Head for FM sound for all modes

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Junichi Sakamoto 1006 Kazuma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. F-term (reference) 5D036 AA04 BB02 BB14 CC69 5D091 AA04 BB01 BB03 EE40 GG02 HH06

Claims (3)

[Claims] 1. A set of at least one set mainly used for recording / reproduction of video signals and special reproduction, which corresponds to a standard recording mode and a recording mode capable of recording twice or three times as long as the standard recording mode. For reproducing a video signal in a long-time recording mode that is five times or more in a magnetic recording / reproducing apparatus having a head group A composed of a pair of heads and a head pair B mainly used for recording and reproducing an audio signal. The head pair B has a relationship of 2 × Px <2 with respect to the track pitch Px in the long-time recording mode of 5 times or more.
It has a head width Twb of Twb <3 × Px, and the center of the head width of the head pair C is positioned at the center of the recording track of the video signal recorded by the head group A during reproduction in the long-time recording mode of 5 times or more. In the case of tracing, all the azimuth recording tracks of the audio signal recorded by the head pair B are traced, and the video signal is transmitted only once later by the head group A in the adjacent track of the reverse azimuth to be traced extra. A magnetic recording / reproducing apparatus, wherein the head pair C is arranged so that two places are not traced simultaneously at a recorded place. 2. A head width Twd of a head pair D used for recording in a long-time recording mode that is five times or more in a head group A.
2. The magnetic recording / reproducing apparatus according to claim 1, wherein Twd <2 × Px with respect to a track pitch Px in a long-time recording mode of 5 times or more. 3. A long-duration recording mode in which the head width Twc of the head pair C is 5 times or more, and
2. The magnetic recording / reproducing apparatus according to claim 1, wherein a relationship of .ltoreq.Px is satisfied.