JPH0454561Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a rotating magnetic head device, and more particularly to an apparatus for recording a plurality of types of signals on separate recording bands using separate rotating magnetic heads and reproducing the signals.

Conventional technology Currently, helical scan magnetic recording and reproducing devices (VTR) use 1/2 inch wide magnetic tape.
Since the band that can be recorded and reproduced for home use is relatively narrow, of the luminance signal and carrier color signal separated from the color video signal, the luminance signal is frequency-modulated to become a frequency-modulated wave, and the carrier color signal is converted into a frequency-modulated wave. A so-called low-pass conversion color recording and reproducing method is adopted in which the converted carrier color signal is frequency-division multiplexed onto the frequency-modulated luminance signal, and this frequency-division multiplexed signal is recorded on a magnetic tape and reproduced. Furthermore, in order to improve tape usage efficiency, a guard bandless recording method is adopted in which the azimuth angles of each rotating head for recording adjacent tracks are made to be different. On the other hand, commercial VTRs intended for broadcasting, especially those with built-in cameras, have the same tape width as home VTRs, with the aim of making the device smaller and lighter and improving the quality of the reproduced color video signal. on magnetic tape,
A method is adopted in which the luminance signal and the color signal are recorded on separate tracks using separate rotating heads, and a guard band is provided between adjacent tracks for recording and reproduction.

Problems to be Solved by the Invention However, since the above-mentioned conventional color video signal recording and reproducing apparatus for professional use has a guard band, the magnetic tape is not used efficiently, and the rotating head may exceed the guard band during playback. If you accidentally operate adjacent tracks, the FM luminance signal and FM color difference signal are recorded separately on the two adjacent tracks. head) and FM color difference signal (or
FM luminance signals), a crosstalk canceling method using field correlation could not be used, and the problem was that the reproduced image would have noticeable crosstalk.

Therefore, the present applicant first proposed patent applications (2) and (3) (title of invention: "Color video signal recording and reproducing device") filed on February 25, 1985. According to the color video signal recording and reproducing apparatus proposed by the present applicant, luminance signals and color signals are separated in the tape width direction in respective recording areas W ₁ and W ₂ in a track pattern as shown in FIG. 6, for example. and play it back. In the same figure, for example, 1/2 inch wide magnetic tape 1
In the upper and lower predetermined width areas W ₁ in the tape width direction of 5, first and second brightness signal rotating heads are provided on the rotating drum 1 shown in FIG.
The first where the FM luminance signal was recorded by Y ₁ and Y ₂
Tracks T〓 ₁ to T〓 ₁₀ are formed in sequence at an angle θ with respect to the longitudinal direction of the tape without a guard band, and on the other hand, in the upper predetermined width region W ₂ there is a rotating drum shown in Fig. 7. first and second color signal rotary heads C ₁ provided at a distance of 180° from each other;
and _C2 , second tracks T _C1 to T _C10 on which FM color difference signals are recorded are sequentially formed at an angle θ with respect to the longitudinal direction of the tape without a guard band.

The head Y ₁ (Y ₂ ) and the head C ₁ (C ₂ ) are provided on the same line with respect to a center line A based on the rotation axis.

Also, in FIG. 6, tracks 16 ₁ , 16 recorded along the longitudinal direction of the magnetic tape 15
₂ , 17 and 18 are tracks formed by dedicated fixed heads; 16 ₁ and 16 ₂ are audio tracks on which the audio signals of the first and second channels are recorded; and 17 is a track for knowing position information on the tape. 18 is a time code track in which a time code is recorded, and 18 is a control track in which a control pulse of a constant period is recorded.

By the way, as shown in FIG. 8, the upper part of the magnetic tape 8 attached to the rotating drum 1 is slightly raised above the rotating drum 1 by the air film.
The lower part of the magnetic tape 8 adhering to the fixed drum 2 is very close to the fixed drum 2 and hardly any air film is formed thereon. As a result, the head C ₁ ,
C ₂ has worse contact with the magnetic tape 8 than heads Y ₁ and Y ₂ .

Further, when the heads Y ₁ and Y ₂ enter the magnetic tape 8, they impart disturbances such as vibration to the magnetic tape 8 for the above-mentioned reasons. As shown in FIG. 7, when the heads C ₁ and C ₂ and the heads Y ₁ and Y ₂ are provided on the same line and are made to enter the magnetic tape 8 at the same time, the heads C ₁ and C ₂ are connected to the heads Y ₁ and Y _{2 .} affected by external disturbances.

In this way, the heads C ₁ and C ₂ are connected to the magnetic tape 8.
There was a problem in that the state of sliding contact with the magnetic tape 8 became unstable due to both the fact that the upper part was floating due to the air film and the disturbance caused by the heads Y ₁ and Y ₂ .

SUMMARY OF THE INVENTION An object of the present invention is to provide a rotating magnetic head device that can stably attach an upper rotating magnetic head to a magnetic tape.

Means for solving the problem In Figures 1A and B, 5 is a rotary head for brightness signals;
Reference numeral 6 denotes a rotary head for color signals, and as shown in _FIG . They are provided with a deviation of a distance α in the rotational direction so that they are located in the same position.

Operation: Since the color signal rotary head 6 enters the magnetic tape 8 earlier than the luminance signal rotary head 5, the head 6 slides onto the magnetic tape 8 almost unaffected by the disturbance of the head 5.

Embodiment FIGS. 1A and 1B show a bottom view and a side view, respectively, of a rotating drum used in an embodiment of the apparatus of the present invention. In order to make the drawing easier to read, the upper half of the figure shows only the upper rotary head for color signals, and the lower half shows only the lower rotary head for luminance signals. In the same figure, 6
is a rotary head for color signals, which is screwed onto the top surface of a recess 9 provided on the lower surface of the rotary drum 3 with a screw 10, and a head tip 11 is inserted into a through hole 12 of the rotary drum 3.
It is provided so as to slightly protrude from its outer circumferential surface through the . The attachment position of the head 6 can be adjusted by inserting predetermined adjustment jigs into the three adjustment holes 13 provided in the rotating drum 3, respectively.

As mentioned above, a rotary head for brightness signals, which will be described later, is provided below the head 6.

Reference numeral 5 denotes a rotating head for luminance signals, which is attached to the lower surface 3a of the rotating drum 3 via a head holding plate 4, which is screwed to the lower surface 3a with a screw 7, and a head tip 20 is provided so as to protrude slightly from the outer peripheral surface through a through hole 21. The mounting position of the head 5 can be adjusted by inserting a predetermined adjustment tool into each of three adjustment holes 19.

As mentioned above, the color signal rotary head 6' is provided above the head 5.

Here, the pair of color signal rotating heads 6 and the pair of luminance signal rotating heads 5 are each mounted on the same rotating surface with an angular interval of 180°.
The upper and lower heads are provided with a step of height h, and are also provided offset by a distance α in the direction of rotation. Further, the respective protruding amounts of the heads 5 and 6 from the outer circumferential surface of the rotating drum 3 are set to be approximately the same amount.

Since the heads 5 and 6 are disposed offset in the rotational direction, the luminance signal track 2
The starting point position of 2〓 and the starting point position of the color signal track _22C are on a line ZZ' perpendicular to the running direction of the magnetic tape 8. Incidentally, in the case shown in FIG. 6, the upper and lower heads are not shifted in the rotational direction, so the respective starting points of both signal tracks are aligned with the line W-
It will exist on W′.

Here, if the distance between the upper and lower patterns is h and the running angle of the magnetic tape 8 is θ, then the deviation distance α between the upper and lower heads on the tape pattern is α=htanθ.

FIG. 3 shows a side view of a rotating drum used in another embodiment of the device of the present invention. In the same figure, 23 ₁ (23 ₂ )
is a rotating head for R signal, 24 ₁ (24 ₂ ) is a rotating head for G signal, 25 ₁ (25 ₂ ) is a rotating head for B signal, and head 25 ₁ (25 ₂ ) and head 24
₁ (24 ₂ ) is provided with a step of height h ₁ and shifted by a distance α ₁ in the direction of rotation, and the head 25 ₁ (2
5 ₂ ) and the head 23 ₁ (23 ₂ ) are separated by a distance α _{2 in the rotational direction with a height h 2 difference} between the rotating drum 26 and the head 23 1 (23 2 ).
installed on.

FIG. 4 shows a track pattern recorded on the magnetic tape 8 by the apparatus shown in FIG. 27 _R is the pattern of the R signal (A in FIG. 5, r is the deviation) recorded by the head 23 1 (23 ₂ ), and _{27 G} is the pattern of the G signal recorded by the head 24 ₁ (24 ₂ ) (Fig. 5A, r is the deviation). B, g is deviation) pattern, 27 _B
is the pattern of the B signal (C and b in the figure are deviations) recorded in the head 25 ₁ (25 ₂ ). As shown in FIG. 4, the starting point position of each track pattern of the R signal, G signal, and B signal is on the line Z--Z' perpendicular to the running direction of the magnetic tape 8.

Note that the three signals may be a luminance signal Y, an RY color difference signal, and a BY color difference signal.

In addition, the present applicant first applied for Utility Model Application No. 57-66496
It can be similarly applied to the utility model registration application (name of the invention: ``Helical Scan Magnetic Recording and Reproducing Device'') of No. 170012).

Effects of the Invention The device of the present invention operates a plurality of sets of rotating magnetic heads in the axial direction so that the starting ends of the signal tracks respectively recorded in the plurality of recording bands are all located on the same line perpendicular to the running direction of the magnetic tape. Since the mounting positions are sequentially shifted in the rotational direction, the upper head enters the magnetic tape earlier than the lower head, and as a result, the upper head is protected from external disturbances such as tape vibration caused by the lower head. It has features such as being less susceptible to influence and being able to slide securely into magnetic tape.

[Brief explanation of the drawing]

Fig. 1 is a diagram of a rotating drum used in one embodiment of the device of the present invention, Fig. 2 is a track pattern formed by the head shown in Fig. 1, and Fig. 3 is a diagram of a drum used in another embodiment of the device of the present invention. A schematic diagram of the drum; FIG. 4 shows the track pattern formed by the head shown in FIG. 3; FIG. 5 shows the frequency spectrum of the R, G, and B signals; FIGS. 6, 7, and 8. 1A and 1B are a schematic view and a cross-sectional view, respectively, of a track pattern and a drum according to the apparatus previously proposed by the present applicant. 3...Rotating drum, 4...Head holding plate, 5...
...Rotary head for brightness signal, 6...Rotary head for color signal, 8...Magnetic tape, 11, 20...Head chip, 22〓...Brightness signal track, 22 _C ...
Color traffic light track.

Claims (1)

[Claims for Utility Model Registration] (1) Using a plurality of sets of rotating magnetic heads provided with steps in the axial direction of a rotating drum, a plurality of types of signals are transmitted to a magnetic tape by the plurality of sets of rotating magnetic heads in the axial direction. In a rotating magnetic head device of a magnetic recording and reproducing apparatus that records data on a plurality of recording bands divided in the width direction so as to form signal tracks inclined with respect to the longitudinal direction of the magnetic tape, the plurality of sets in the axial direction are rotating magnetic head,
A rotating magnetic head device whose mounting positions are sequentially shifted in the rotational direction so that the starting ends of the signal tracks respectively recorded on the plurality of recording bands are all located on the same line perpendicular to the running direction of the magnetic tape. . (2) The rotating magnetic head device according to claim 1, wherein the plurality of rotating magnetic heads in the axial direction are a rotating magnetic head for color signals and a rotating magnetic head for brightness signals.