JP3585777B2 - Magnetic recording / reproducing device - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a magnetic recording / reproducing apparatus having a long-time recording mode four times or more that of a standard recording mode.
[0002]
[Prior art]
In recent years, the cost of magnetic recording / reproducing devices has been reduced and the running cost of magnetic tapes has been required to be reduced. However, to increase the recording time, a standard mode and a recording mode that can record twice or three times as long as the standard mode (hereinafter, a mode that can record twice as long as the standard mode, a double mode, and a triple time recording) Only the 3 × mode, also called the 4 × mode, the 5 × mode and the 6 × mode) have been introduced on the market.
[0003]
Hereinafter, a conventional magnetic recording / reproducing apparatus will be described.
[0004]
Conventionally, a magnetic recording / reproducing apparatus capable of performing recording / reproducing in a 6-times mode as long-time recording of 4 times or more is disclosed in Japanese Patent Application Laid-Open No. 7-73405. The magnetic recording / reproducing apparatus is shown in FIG. 3 and FIG. 3 and 4 are schematic explanatory views showing the configuration of a rotary head of a conventional magnetic recording / reproducing apparatus. A small circle on a large circle indicates a mounted head. In FIG. 3, 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 having a head width substantially equal to the track pitch in the triple mode. Four heads of a double azimuth system including a head pair 7 (7R, 7L) and a 6 × mode head pair 6 (6R, 6L) having a head width slightly smaller than twice the track pitch in the 6 × mode and all modes Is provided with an audio head 4 (4R, 4L) used for the above.
[0005]
The operation of the conventional magnetic recording / reproducing apparatus configured as described above will be described below in accordance with that described in JP-A-7-73405.
[0006]
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. Recording / reproduction in the 6 × mode is performed by the 6 × mode head pair 6.
[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.
[0008]
Next, the configuration of the head shown in FIG. 4 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 head pair used for triple-mode recording and reproduction. Generally, the head width of each head is selected to be about 49 μm for the head pair E and about 26 μm for the head pair F. Also, 8R and 8L are provided for recording and reproduction for the 6 × mode, and these are referred to as a head pair G. The head width of the head pair G is set to be slightly narrower 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. The head pair B is a pair of HiFi audio heads and is used commonly for standard, triple and six times triple mode recording and reproduction. 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]
[Problems to be solved by the invention]
However, in the configuration of FIG. 3, as described in Japanese Patent Application Laid-Open No. 7-73405, in special playback in all modes, the video signal after the FM demodulation of the playback signal output and the low-frequency conversion chrominance signal are one. There is a problem that a digital circuit having a field memory for storing fields is required, and the cost burden is large.
[0010]
In addition, it is necessary to newly manufacture four heads with heads with different azimuth angles from the conventional ones and normal heads with a narrower track pitch for the standard mode, which is cost-effective in view of the balance between plant equipment investment and quantity. The problem of heavy burden is expected.
[0011]
Further, in the configuration shown in FIG. 4, 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.
[0012]
3 and FIG. 4, the recording / reproduction in the 6 × mode is performed by a head set to a head width slightly smaller than twice the track pitch of 6 times. This is because recording and reproduction are performed with the same head, so that the head width must be wider than the track pitch in order to eliminate the unerased HiFi sound during recording. On the other hand, 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.
[0013]
This point will be described with reference to FIG. FIG. 5 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-times mode, and have a pitch of 9.6 μm. P1 and P3 and P2 and P4 have the same azimuth.
[0014]
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 a standard triple and six times mode, and is a head pair B composed of 4L and 4R in FIGS. 3 and 4. The head width is disclosed in Japanese Patent Application Laid-Open No. 7-73405. As described, in general, 26 μm to 30 μm is selected in consideration of compatible reproduction. 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 a 6 × mode, and is a head pair G of 7L and 7R in FIG. 3, and a head pair G composed of 8L and 8R in FIG.
[0015]
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.
[0016]
In FIG. 5, the recording of the sound is performed by the 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. 5 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. 5 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. Two recording tracks beyond P2 have the same azimuth (hereinafter referred to as adjacent tracks. In FIG. 5, the adjacent track of P2 is P4. The adjacent recording tracks are also referred to as adjacent tracks. The adjacent tracks are P1 and P3). Control is performed by shifting the recording position by (26 μm−9.6 μm) /2=8.2 μm from the recording position such that the center of the P2 track and the center of the center of the head B overlap each other, ie, the position where the margin is not traced. The result is B '. 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 having a different azimuth angle must be affected by the image quality deterioration. Conversely, if the width of the head B is narrowed 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.
[0017]
SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems, and provides good sound quality by preventing a HiFi head from picking up adjacent tracks in a long-time recording mode of four times or more without reducing the track pitch of the HiFi head. Also, to provide a magnetic recording / reproducing apparatus which provides good image quality without crosstalk from adjacent tracks for video and also enables special reproduction in standard mode and triple mode without using a field memory as before. With the goal.
[0018]
[Means for Solving the Problems]
In order to achieve this object, the magnetic recording / reproducing apparatus according to the present invention is compatible with a standard recording mode and a double or triple recording mode capable of recording twice or three times as long as the standard recording mode. Mainly used for video signal recording and playback and special playback In addition, it corresponds to a long time recording mode that is four times or more longer than that of the standard mode and is used for recording a video signal. A head group A composed of one or more head pairs, mainly Head pair B used for recording and playback of audio signals When, Head pair C used to reproduce a video signal in a long-time recording mode of 4 times or more The head group A has a head width Twd in a relationship of Twd ≦ 2 × Px with respect to a track pitch Px in a long-time recording mode of four times or more, and performs recording in a long-time recording mode of four times or more. The head pair B has a track pitch Tw in a relationship of P3 <Twb <3 × Px with respect to the track pitch P3 in the triple recording mode and the track pitch Px, The head pair C has a track width Twc in a relationship of Twc ≦ Px with respect to the track pitch Px, At the time of reproduction in the long time recording mode of 4 times or more, the track width center of the head pair C is Recorded by the head pair D When tracing the center of a video track, the head pair B Recorded Trace audio tracks Occasionally Do not trace adjacent tracks In a relationship, The head pair C For the head pair B It has a configuration in which it is arranged.
[0019]
With this configuration, it is possible to use a conventional double azimuth type four head and a HiFi head. Therefore, the recording / reproduction and the special reproduction in the standard mode and the double or triple mode can be conventionally performed. Therefore, a field memory for storing one field of the video signal after the demodulation of the reproduction signal output and the low-frequency conversion color signal in one field. The digital circuit having is unnecessary and the cost burden is small.
[0020]
Further, since the newly added head pair C is also formed at the same azimuth angle as the conventional one, the investment in plant equipment can be reduced.
[0021]
Further, a dedicated head pair C is provided during reproduction in the long-time recording mode of 4 times or more, and the same full-track reproduction as in the related art is performed in the 3 times mode recording / reproduction, so that the output does not decrease.
[0022]
In this way, it is possible to provide good sound without the influence of tracks adjacent to each other and good image quality without crosstalk from adjacent tracks during reproduction in the long-time recording mode that is four times or more.
[0023]
BEST MODE FOR CARRYING OUT THE INVENTION
The invention according to claim 1 of the present invention corresponds to a standard recording mode and a double or triple recording mode capable of recording twice or three times as long as the standard recording mode, and mainly comprises a video signal. Used for recording / playback and special playback In addition, it corresponds to a long time recording mode that is four times or more longer than that of the standard mode and is used for recording a video signal. A head group A composed of one or more head pairs, mainly Head pair B used for recording and playback of audio signals When, Head pair C used to reproduce a video signal in a long-time recording mode of 4 times or more The head group A has a head width Twd in a relationship of Twd ≦ 2 × Px with respect to a track pitch Px in a long-time recording mode of four times or more, and performs recording in a long-time recording mode of four times or more. The head pair B has a track pitch Tw in a relationship of P3 <Twb <3 × Px with respect to the track pitch P3 in the triple recording mode and the track pitch Px, The head pair C has a track width Twc in a relationship of Twc ≦ Px with respect to the track pitch Px, At the time of reproduction in the long time recording mode of 4 times or more, the track width center of the head pair C is Recorded by the head pair D When tracing the center of a video track, the head pair B Recorded Trace audio tracks Occasionally Do not trace adjacent tracks In a relationship, The head pair C For the head pair B A pair of heads of a head group A having a head width surely wider than a track pitch during long-time recording four times or more during long-time recording four times or more. (Head vs. D) By using the head pair B as a dedicated head for reproducing video signals in the long-time recording mode of 4 times or more, the head pair B is used to record FM video and the FM audio is prevented from being erased by the video signal. It is possible to have the same configuration of the head group A as that of a conventional magnetic recording / reproducing apparatus which does not have a long time recording mode of 4 times or more, and it is possible to perform standard, double or triple times special reproduction. Have.
In the case of tracing in which the center of the head width of the head C provided exclusively for the reproduction of the video signal coincides with the center of the recorded video track regardless of the head width at the time of reproduction in the long time recording mode of 4 times or more. The head pair B is traced so that the center of the track of the head pair B substantially coincides with or slightly shifts from the center of the track of the recorded FM sound so that the head pair B does not trace adjacent tracks. By doing so, it is possible to obtain an excellent sound free from the influence of adjacent tracks in long-time recording / reproduction in the quadruple mode or longer.
Further, it is possible to control the head pair B so as to ensure compatible reproduction of the standard or double or triple mode, and not to trace adjacent tracks when reproducing in the long-time recording mode of four times or more. It has the action of:
In addition, there is an effect that a video signal with little influence of crosstalk from an adjacent track can be obtained during reproduction in a long time recording mode of 4 times or more.
[0027]
Hereinafter, embodiments of the magnetic recording / reproducing apparatus of the present invention will be described with reference to FIGS.
[0028]
(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) on a large circumference 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 set in a relationship of Twd ≦ 2 × Px. Here, Px is a track pitch in the long-time recording mode that is four times or more.
[0029]
Next, a head pair composed of 4L and 4R is referred to as a head pair B. The head width (Twb) of the head pair B is set in a relationship of P3 <Twb <3 × Px. Here, P3 is the track pitch in the double or triple mode.
[0030]
Next, a head pair composed of 3R and 3L is referred to as a head pair C. The head width (Twc) of the head pair C is set to Twc ≦ Px.
[0031]
The operation of the magnetic recording / reproducing apparatus having the head configuration as described above will be described. Head group A records and reproduces video in standard mode and double or triple mode and special reproduction And a head used for recording a video in a long time mode of 4 times or more, and a head pair D of a head group A is used for recording a video in a long time mode of 4 times or more. Also, Head pair B is a head used for recording / reproducing and special reproduction of FM audio in all modes of standard, 2 times, 3 times, 4 times or more. , The head pair C is a head used only for reproducing a video signal in a long time mode of 4 times or more. here, Since the head group A comprises four heads of the double azimuth system, Standard and double and triple video and audio recording and playback and special playback are well-known technologies. , Not discussed here.
[0032]
Next, the operation at the time of long time recording of four 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 Embodiment 1 of the present invention traces a recording track in a long time mode of four times or more. Q1, Q2, Q3, and Q4 are tracks of HiFi audio and video signals in the long time mode of 4 times or more, and the pitch thereof is Px. Q1 and Q3 and Q2 and Q4 have the same azimuth relationship. Similarly, with respect to Q2, Q1 and Q3 have an inverse azimuth relationship.
[0033]
Although the HiFi audio track and the video track do not always match, it is assumed here that they match for the sake of simplicity.
[0034]
In the figure, B and B 'record and reproduce FM sound by a head pair B composed of 4R and 4L in FIG. B indicates the position at the time of recording, and is controlled to the position of B 'during reproduction in the long time recording mode of 4 times or more. Similarly, D and D 'are a head pair D composed of 2L and 2R in FIG. 1 and perform video recording during long-time recording of 4 times or more. The head output is not used during reproduction in the long time recording mode of 4 times or more. In the figure, C and C ′ are head pairs C composed of 3R and 3L in FIG. 1, and are heads dedicated to reproducing video that are not used during recording in the long-time recording mode of 4 times or more.
[0035]
In FIG. 2, sound recording is performed by the head B. Since the head width of the head B is wider than Px, the relationship between the head and the recording track as shown in FIG. 2 is obtained. Similarly, since the video signal is recorded by the head D having a head width wider than the track pitch, the positional relationship between the head D and the recording track as shown in FIG. 2 is obtained. However, since the head width of the head D is 2 × Px or less, when the Q2 track is recorded, the Q4 track having the same azimuth is not affected. That is, the azimuth is not overwritten.
[0036]
Next, at the time of reproduction in the long time recording mode of 4 times or more, for example, the 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 track Q2 can be traced, and a reproduced video signal which does not receive any crosstalk from the images of the adjacent tracks Q1 and Q3 is obtained. be able to. As a result, the center of the head C and the center of the Q2 track can be overlapped during reproduction in the long-time recording mode four times or more. The sound is reproduced as follows. When the audio head B traces the Q2 track, it shifts to the position of B '. In this case, in order to avoid tracing the azimuth Q4, in this case, the position having the most room, that is, from the recording position (Twb-Px) from the recording position so that the center of the Q2 track and the center of the head B overlap each other. / 2 shifted. This shift distance can be obtained by adjusting the head height of the head C with respect to the head B or the position on the rotary head cylinder, and both the center of the head C and the center of the head B coincide with the center of the Q2 track. As a result, the head B does not need to be affected by intense crosstalk from the azimuth. As described above, the center of the head C and the center of the Q2 track can be overlapped during reproduction in the long-time recording mode of four times or more by using the auto tracking by the head pair C as described above. As a result, similarly to the case where the head B is shifted by (Twb-Px) / 2, both the head D and the head C are shifted by (Twb-Px) / 2, and the positions are D 'and C', respectively. This shift distance can be obtained by adjusting the head height of the head C with respect to the head D or the position on the rotary head cylinder. The head C is not used for recording.
[0037]
With this configuration, it is possible to use a conventional double azimuth type four head and a HiFi head. Therefore, the recording / reproduction and the special reproduction in the standard mode and the double or triple mode can be conventionally performed. Therefore, a field memory for storing one field of the video signal after the demodulation of the reproduction signal output and the low-frequency conversion color signal in one field. The digital circuit having is unnecessary and the cost burden is small.
[0038]
Further, since the newly added head pair C is also formed at the same azimuth angle as the conventional one, the investment in plant equipment can be reduced.
[0039]
Further, a dedicated head pair C is provided during reproduction in the long-time recording mode of 4 times or more, and the same full-track reproduction as in the related art is performed in the 3 times mode recording / reproduction, so that the output does not decrease.
[0040]
The 5 × mode is practical as a long time recording mode of 4 × or more, 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. The head D is used for recording in both the 3 × mode and the N × mode. 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 μm / 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 to avoid the overwriting of the same azimuth by the head pair D during the N-times mode recording.
[0041]
Therefore, the integer N satisfying 19.3 μm ≦ Twd ≦ 2 × 58 μm / N is 6 or less. The maximum value of the integer N is 5 in consideration of mechanical variations. That is, the 5 × mode is practical.
[0042]
As described above, according to the first embodiment, when recording in the long-time recording mode of 4 times or more, the head width surely has a head width wider than the track pitch in recording in the long-time recording mode of 4 times or more. The video is recorded by a pair of heads of the head group A, and the FM audio is recorded by the head pair B to prevent uncleared by the video signal of the FM audio. By using as a read-only head, it becomes possible to have the same head group A configuration as a conventional magnetic recording / reproducing apparatus which does not have a quadruple or more long-time recording mode. Becomes possible.
[0043]
In the case of tracing in which the center of the head width of the head C provided exclusively for the reproduction of the video signal coincides with the center of the recorded video track regardless of the head width at the time of reproduction in the long time recording mode of 4 times or more. The head pair B is traced such that the center of the track of the head pair B substantially coincides with or slightly deviates from the center of the track of the recorded FM sound so that the head pair B does not trace the adjacent tracks. By doing so, it is possible to obtain good sound which is not affected by adjacent tracks during reproduction in a long time recording mode that is four times or more.
[0044]
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 color signal is unnecessary, and the cost burden is small.
[0045]
Further, since the newly added head pair C is also formed at the same azimuth angle as the conventional one, the investment in plant equipment can be reduced.
[0046]
Further, a dedicated head pair C is provided during reproduction in the long-time recording mode of 4 times or more, and the same full-track reproduction as in the related art is performed in the 3 times mode recording / reproduction, so that the output does not decrease.
[0047]
Further, in the head group A, the head width Twd of the head pair D used for recording in the long-time recording mode of 4 times or more is longer than the track pitch Px of the long time recording mode of 4 times or more. With this relationship, overwriting of the same azimuth by the head D is not performed during recording for a long time of four times or more, so that image quality deterioration due to overwriting of video signals can be suppressed.
[0048]
Further, it is assumed that P3 <Twb <3 × Px with respect to the track pitch P3 in the long-time recording mode in which the head width Twb of the head pair B is three times and the track pitch Px in the long-time recording mode in which the head width B is four times or more. This makes it possible to control the head pair B so as not to trace adjacent tracks during reproduction in the long-time recording mode of 4 times or more while guaranteeing compatible reproduction of the standard or double or triple mode. .
[0049]
In addition, the relationship of Twc ≦ Px 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 four times or more enables the influence of crosstalk from an adjacent track at the time of reproduction in the long-time recording mode four times or more. And a good image quality can be provided.
[0050]
In the first embodiment, the case where the video recording track and the audio recording track overlap is described for the sake of simplicity. However, if they do not overlap, the center of the Q2 track and the center of the center of the head B overlap. May not be the best. In this case, it is necessary to shift the position slightly to the best position.
[0051]
【The invention's effect】
As described above, according to the present invention, the head group A having a head width wider than the track pitch during recording in the long-time recording mode of four times or more is surely used in the long-time recording mode of four times or more. Use a pair of heads to record video, and a head pair B to record FM audio to prevent undesired deletion of the FM audio video signal, and use a head pair C as a head dedicated to reproducing video signals in a long-time recording mode that is four times or more. By doing so, it is possible to have the same configuration of the head group A as the conventional magnetic recording / reproducing apparatus which does not have the long-time recording mode of 4 times or more, and it is possible to perform the standard, double or triple special reproduction. Excellent effects can be obtained. Also, in the case of tracing in which the center of the head width of the head C provided exclusively for the reproduction of the video signal coincides with the center of the recorded video track irrespective of the head width at the time of reproduction in the long time recording mode of 4 times or more. The head pair B is traced such that the center of the track of the head pair B substantially coincides with or slightly deviates from the center of the track of the recorded FM sound so that the head pair B does not trace the adjacent tracks. By doing so, it is possible to obtain an excellent effect that it is possible to obtain good sound with little influence of adjacent tracks during reproduction in a long time recording mode that is four times or more.
[0052]
In addition, a digital circuit having a field memory for storing one field of the video signal and the low-frequency conversion color signal after the reproduction signal output is subjected to FM demodulation is unnecessary, and an excellent effect that the cost burden is reduced is obtained.
[0053]
Also, since the newly added head pair C has the same azimuth angle as the conventional one, an excellent effect that the investment in the plant equipment is small can be obtained.
[0054]
Furthermore, a special head pair C is provided for reproduction in a long-time recording mode of 4 times or more, and the same full-track reproduction as in the related art is performed in a 3 times mode recording / reproduction. can get.
[0055]
Further, in the head group A, the head width Twd of the head pair D used for recording in the long-time recording mode of 4 times or more is longer than the track pitch Px of the long time recording mode of 4 times or more. With this relationship, overwriting of the same azimuth by the head D is not performed during long-time recording of four times or more, so that an excellent effect that image quality deterioration due to overwriting of video signals can be suppressed can be obtained.
[0056]
It is assumed that P3 <Twb <3 × Px with respect to the track pitch P3 in the long-time recording mode in which the head width Twb of the head pair B is three times and the track pitch Px in the long-time recording mode in which the head width B is four times or more. This makes it possible to control the head pair B so as not to trace adjacent tracks during reproduction in the long-time recording mode of 4 times or more while guaranteeing compatible reproduction of the standard or double or triple mode. This is an excellent effect.
[0057]
In addition, the relationship of Twc ≦ Px 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 four times or more enables the influence of crosstalk from an adjacent track at the time of reproduction in the long-time recording mode four times or more. An excellent effect that a good image quality can be provided by obtaining a video signal with little noise can be obtained.
[Brief description of the drawings]
FIG. 1 is a diagram showing a head configuration of a magnetic recording and reproducing device 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 explanatory view showing a head configuration of a conventional magnetic recording / reproducing apparatus.
FIG. 4 is a schematic explanatory view showing a head configuration of a conventional magnetic recording / reproducing apparatus.
FIG. 5 is a diagram conceptually showing how a head of a conventional magnetic recording / reproducing apparatus traces a recording track.
[Explanation of symbols]
1 Standard mode head
2 Head for 2x or 3x mode
A read-only head in a long recording mode of more than 34 times
4 FM sound head for all modes
5 Conventional standard mode head
6 Conventional 6x mode head
7 Conventional 3x mode head
8 Conventional 6x mode head
9 Conventional 3x mode head
Recording track in P 6x mode
Q: Recording tracks in long-time recording mode of 4 times or more
A Double azimuth type head group composed of a standard mode head and a head used only for long-time recording mode of 2 times or 3 times mode and 4 times or more
B FM audio head pair for all modes
C Read-only head pair in long-time recording mode of 4 times or more
D A pair of heads used only in the double or triple mode and in the long time recording mode of 4 times or more in the head group A.
E Conventional standard mode head pair
F Conventional 3x mode head pair
G Head pair used for conventional 6x mode recording and reproduction

Claims (1)

Corresponding to twice or three times the recording mode to the standard recording mode and the standard recording mode to enable 2-fold or 3-fold long-time recording, mainly with use in recording and reproduction and the special reproduction of the video signal, the corresponding to long-time recording mode more than 4 times that enable long-time recording of more than 4 times the standard mode, the head group a composed of one or more sets of head pairs to be used for recording of the video signal, the main comprising a pair of heads B to be used for recording and reproduction of audio signals, and a head-to-C to be used to reproduce the video signal of the long-time recording mode at least four times,
The head group A has a head width Twd that satisfies a relationship of Twd ≦ 2 × Px with respect to a track pitch Px in a long-time recording mode of four times or more, and is used for recording in a long-time recording mode of four times or more. The head pair B includes a pair D, a track pitch Tw in a relationship of P3 <Twb <3xPx with respect to the track pitch P3 in the triple recording mode and the track pitch Px, and the head pair C , A track width Twc having a relationship of Twc ≦ Px with respect to the track pitch Px,
At the time of reproduction in the long-time recording mode of 4 times or more, when the track width center of the head pair C traces the center of the video track recorded by the head pair D , the head pair B is moved by the head pair B. A magnetic recording / reproducing apparatus , wherein the head pair C is arranged with respect to the head pair B in such a manner that adjacent tracks are not traced when a recorded audio track is traced.

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