JPS61214271A - Tape guide drum device - Google Patents

Abstract

PURPOSE:To slide rotary magnetic heads on a magnetic tape more stably by forming recessed parts in positions between individual pairs of rotary magnetic heads on the outside peripheral surface of a rotary drum. CONSTITUTION:Grooves 22 are formed throughout in the same level as rotary magnetic heads 21, 22, 31, and 32 in positions between rotary magnetic heads 21 and 22 and rotary magnetic heads 31 and 32 on the outside peripheral surface of a rotary drum 14. An air film 23 is formed on all of the outside peripheral surface of the drum 14 by high-speed rotation of the drum 14. Since recessed parts 23a are formed in positions of grooves 22, parts of the surface of the magnetic tape 5 corresponding to recessed parts 23a are recessed along the outside peripheral surface of the film 23. That is, the part between heads 21 and 31 is formed to a recessed part 5a and approaches the outside peripheral surface of the drum 14, and upper and lower parts of the recessed part 5a are drawn to approach the outside peripheral surface of the drum 14, and the tape is brought into contact with heads 21 and 31 surely. The same phenomenon occurs in the part scanned with heads 22 and 32, and heads 21, 22, 31, and 32 are slided on the magnetic tape 5 stably to transmit and receive signals surely.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a tape guide drum device, and particularly to a tape guide drum device in which the height of a rotating magnetic head is increased so as to record different types of signals in areas separated in the width direction of a magnetic tape. The present invention relates to a tape guide drum device having a different configuration.

Conventional technology The present applicant previously filed a patent application dated February 25, 1985 (title of invention [Color video signal recording and reproducing device]).
proposed. FIG. 9 shows a tape guide drum device applied to this device, and FIG. 10 shows a track pattern formed on a magnetic tape by this tape guide drum device.

In Fig. 9, reference numeral 1 denotes a rotating drum, with a rotating magnetic head 2+ (22) for color signals spaced 180° above, and 18 below.
Luminance signal rotary magnetic heads 31 (32) are provided with steps at a distance of 0°.

4 is a fixed drum, and a reed 4a is provided.

The magnetic tape 5 is guided by the lead 4a and runs attached to the rotating drum 1 and the fixed drum 4.
As shown in the figure, a first track 6Y on which an FM luminance signal is recorded by the rotary magnetic heads 31 and 32 for luminance signals is located in a predetermined width area W1 at the upper and lower sides in the tape width direction of the magnetic tape 5 having a width of 1x2 inches. is the angle θ with respect to the longitudinal direction of the tape
It is formed sequentially with no guard band,
On the other hand, in the upper predetermined width area W2, the second track 6c on which the FM color difference signal is recorded by the color signal rotary magnetic heads 2I and 22 is tilted at an angle θ with respect to the longitudinal direction of the tape and is sequentially tracked without a guard band. It is formed.

In FIG. 10, tracks 7+ + 72 +81 and 82 formed along the longitudinal direction of the magnetic tape 5 are tracks recorded and formed by a dedicated fixed head, and 7+ and 72 are tracks 7+ and 72 formed along the longitudinal direction of the magnetic tape 5. 8+ is an audio track where the audio signal of the second channel is recorded, 8+ is a time code track where a time code for knowing the position information on the tape is recorded, and 82 is a control track where a control pulse of a constant period is recorded. .

Problems to be Solved by the Invention As is well known, an air film is formed around the rotating drum 1 due to the high speed rotation of the rotating drum 1.

Although this air film has the effect of making the magnetic tape slightly float above the surface of the rotating drum 1 and reducing the rotational loss of the rotating drum 1, it also has the effect of reducing the rotational loss of the rotating magnetic head. This will have a negative effect on the tape.

As shown in FIG. 11, the air film 9t tends to be thinner at the rotating surface of the lower rotating magnetic head 3+ (3z) and thicker at the rotating surface of the upper rotating magnetic head 2+ (22). There is. For this reason, the state of contact between the upper rotary magnetic head 21 (22) and the magnetic tape tends to deteriorate. Further, when the lower rotary magnetic head 31 (32) enters the magnetic tape, it pushes the magnetic tape away and gives a disturbance such as vibration to the magnetic tape. The rotating magnetic head 2+ (22) is arranged close to the rotating magnetic head 31 (32),
The rotating magnetic head 2+ (22) is the rotating magnetic head 31 (3).
2) is affected by disturbances.

As described above, the sliding contact between the rotating magnetic heads 2+ and 22 with the magnetic tape becomes unstable due to both the fact that the upper edge of the magnetic tape is floating due to the air film and the disturbance caused by the rotating magnetic heads 3+ and 32. There was a problem in that spacing loss occurred and signal transmission and reception was inhibited.

An object of the present invention is to provide a tape guide drum device that solves the above problems.

Means for Solving the Problems The present invention has a configuration in which a recess is formed on the outer circumferential surface of a rotating drum at a location between each set of rotating magnetic heads.

The working air film is formed along the outer peripheral surface of the rotating drum. At the above-mentioned concave portions, the air film becomes concave,
As a result, the magnetic tape also becomes concave and approaches the circumferential surface of the rotating drum, improving contact with the rotating magnetic head.

Embodiments Next, embodiments of the tape guide drum device according to the present invention will be described.

FIG. 1 shows an enlarged view of the main part of the present invention, FIGS. 2(A) and 2(B) respectively show a tape guide drum device 10 of the present invention, and FIG. 3 shows a tape guide drum.

As shown in FIGS. 2(A), (B), and FIG. 3, the tape guide drum device 10 includes a lower fixed drum 11, a drum motor 12 integrated with the fixed drum 11, and a drum motor 12. It consists of an upper rotating drum 14 which is fixed to a motor shaft 13 and rotates in the direction of the arrow. The fixed drum 11 and the rotating drum 14 constitute a tape guide drum 15.

The color signal rotary magnetic heads 2+ and 22 are mounted at the same height position indicated by H1 above the axis Z direction of the tape guide drum device 10. Rotating magnetic head for brightness signal 3+, 3
2 is attached at a position lower than the above-mentioned height position H1, indicated by H2. Further, the rotating magnetic heads 2+ and 3+ are arranged at the same position in the rotation direction of the rotating drum 14, and the rotating magnetic heads 22.32 and the rotating magnetic heads 2+ and 3+ are arranged opposite to each other in the radial direction of the rotating drum 14. .

The magnetic tape 5 is attached to the tape guide drum 1 over an angular range of just over 180 degrees determined by the guide balls 16 and 17.
5, and runs in the direction of arrow B with its lower edge guided by a lead 18. Rotating magnetic head 2+
, 22.3+, and 3z scan the magnetic tape 5, and a track pattern as shown in FIG. 9 is formed on the magnetic tape 5.

The rotating magnetic head 21 is attached by screwing a small size support 191 to the ceiling surface of the recess 20 formed in the rotating drum 14. Another rotating magnetic head 31 is attached by screwing a large size support 21+ to the lower surface of the rotating drum 14 to which it is fixed. The rotating magnetic heads 22, 32 on the opposite side are also mounted by screwing the ports 192, 212, respectively.

Each of the rotating magnetic heads 2+, 22.3+, and 32 protrudes from the circumferential surface of the rotating drum 14 by a predetermined amount, for example, 30 μm.

Reference numeral 22 denotes a groove that forms the main part of the present invention, and the rotary magnetic head 21, 22, 3+, 3
It is formed around the entire circumference at a height between 2 and 3. This groove 22 has a width of C and a depth of D.

Next, the function of the groove 22 will be explained with reference to FIG. 1.

Due to the high speed rotation of the rotating drum 14 in the direction of arrow A, an air film 23 is formed on the outer peripheral surface of the rotating drum 14 (see FIG. 3).
is formed all around the circumference. The air film 23 is formed to follow the shape of the outer peripheral surface of the rotating drum 14, and its cross section is as shown in FIG. 3, with the grooves 22 forming concave portions 23a. Therefore, this air film 2
The magnetic tape 5 supported by the magnetic tape 3 also follows the outer peripheral surface of the air film 23, and the concave portion 23a becomes concave. That is, the rotating magnetic heads 2+, 3+
Looking at the part of the magnetic tape 5 that is just being scanned, as shown in FIG. . As a result, the portions of the magnetic tape 5 on the upper and lower sides of the concave portion 5a are also drawn close to the outer peripheral surface of the rotating drum 14, that is, the flying height of the magnetic tape 5 in these portions is suppressed, and the rotating magnetic head 21° 31. The same phenomenon occurs in the portion where the magnetic tape 5 is scanned by the rotating magnetic head 22, 32 on the opposite side.

Therefore, the lower rotary magnetic head 31. ．． 32, as well as the upper rotary magnetic heads 2+ and 2, where sliding contact tends to be unstable.
2 also makes stable sliding contact with the magnetic tape 5, and the transmission and reception of signals is reliably performed without any spacing loss.

In the above embodiment, since the groove 22 that acts to draw the magnetic tape 5 toward the outer peripheral surface of the rotating drum 14 is formed over the entire circumference of the rotating drum 14, the concave portion 5a of the magnetic tape 5 is 5 is wound around the rotating drum 14 and is formed in a groove shape over the entire angular range. That is, the concave portions 5a are arranged so that the rotating magnetic heads 2+, 22.3+, 3
2 is formed over the entire length of the scheduled section to be scanned.

Therefore, as shown in FIG. 4, compared to the configuration in which the recesses are locally formed, the rotating magnetic head 2+ + 22 +3
+, the welding of the magnetic tape 5 of 32 becomes more stable.

Next, another embodiment of the tape guide drum device of the present invention will be described. In each figure, the same components as those shown in FIGS. 2 and 3 are designated by the same reference numerals, and their explanations will be omitted.

FIG. 4 shows a second embodiment of the device according to the invention. In this tape guide drum device 30, a recess 32 is locally formed in the rotating drum 31 at a location between the rotating magnetic heads 21 and 31. This recess 32 also corresponds to the groove 2 of the above embodiment.
2, the magnetic tape becomes concave as shown in FIG. 1, and the welding of each rotary magnetic head 2+ and 3+ to the magnetic tape is stabilized.

FIG. 5 shows a third embodiment of the device according to the invention. This tape guide drum device 40 is an example in which the rotating magnetic heads 2I and 31 are not aligned in the axial direction but shifted in the circumferential direction. A groove 42 is formed around the entire circumference at a height of .

FIG. 6 shows a fourth embodiment of the device of the present invention. This tape guide drum device 50 has a configuration in which three sets of rotating magnetic heads 52, 53, and 54 are attached to a rotating drum 51 at different heights. and the rotating magnetic head 53.
Grooves 55 and 56 are formed along the entire circumference at height positions between and 54, respectively. The magnetic tape has concave portions corresponding to the grooves 55 and 56, respectively, so that the magnetic tape reliably contacts each of the rotating magnetic heads 52, 53, and 54.

FIG. 7 shows a fifth embodiment of the device of the present invention. This tape guide drum device 60 has a rotating drum 61 stacked vertically on an upper rotating drum body 62 to which a rotating magnetic head 21 is fixed and a lower rotating drum body 63 to which a rotating magnetic head 31 is fixed. The structure is as follows. A groove 64 is formed around the entire circumference of the lower rotating drum body 63. This groove 64
functions in the same manner as 22 described above.

FIG. 8 shows a sixth embodiment of the device of the present invention. This tape guide drum device 70 stacks a rotating drum 71, an upper rotating drum body 72, and a lower rotating drum body 73, which has a rotating magnetic head 21% on the upper surface and a rotating magnetic head 31 fixed on the lower surface, vertically. The structure is as follows. A groove 74 is formed around the entire circumference of the lower rotating drum body 73. This groove 74
functions similarly to groove 22 described above.

The arrangement of the pair of rotating magnetic heads is the same as the above-mentioned 180.
Of course, it is not limited to degree intervals.

Effects of the Invention As described above, the tape guide drum device of the present invention has recesses formed in the outer peripheral surface of the rotating drum at the locations between the plurality of sets of rotating magnetic heads arranged at different heights. Since the air film formed along the outer circumferential surface of the rotating drum has a concave shape at the concave portions, the magnetic tape supported by this air film also has a concave shape at the concave portions, and the rotating drum The flying height of the magnetic tape is suppressed by the air film, and the magnetic tape reliably contacts each of the rotating magnetic heads arranged at different heights, ensuring that all the rotating magnetic heads are in sliding contact with the magnetic tape. It is possible to stabilize the signal transmission and reception between the rotating magnetic head and the magnetic tape without any spacing loss. In this case, the magnetic tape has a concave shape over the entire angular range where it is attached to the rotating drum, that is, over the entire length of the section scanned by the rotating magnetic head, compared to a case where the concave portion is formed locally.
It has the advantage that sliding contact between the rotating magnetic head and the magnetic tape can be made more stable.

[Brief explanation of drawings]

FIG. 1 is an enlarged and exaggerated view showing the magnetic tape guiding situation according to the first embodiment of the tape guide drum device according to the present invention, and FIGS. 2(A>, (B) and 3) are respectively A plan view, a partially longitudinal front view, a front view, and a front view of the first embodiment of the device of the present invention, FIGS. 4 and 5. FIG. 6 is a front view of the second, third and fourth embodiments of the device of the present invention, respectively. 7 and 8 are longitudinal sectional front views of the fifth and sixth embodiments of the apparatus of the present invention, respectively, and FIG. 9 is a tape guide drum applied to the magnetic recording and reproducing apparatus previously filed by the present applicant. A schematic diagram of the device; FIG. 10 is a diagram showing the track pattern formed on the magnetic tape by the device of the previous application; FIG. 11 is a diagram showing the guidance of the magnetic tape by the tape guide drum device of FIG. 9. 2+, 22... Rotating magnetic head for color signals, 3+. 32... Rotating magnetic head for brightness signals, 5... Magnetic tape, 5a... Concave portion, 6Y... First track ,
6c...Second track, 10.30.40,50°60.70...Tape guide drum device, 11...
Fixed drum, 12...Drum motor, 14.31゜4
1.51.61.71...Rotating drum, 15...Tape guide drum, 22.42,55,56°64.7
4... Groove, 23... Air film, 23a... Concave portion, 32... Concave portion, 62.72... Upper rotating drum body, 63.73... Lower rotating drum body. Patent applicant: Japan Victor Co., Ltd. s7 Figure 8 Figure 3 Figure 4 Diversion procedure amendments Commissioner of the Patent Office Manabu Shiga 1, Indication of the case 1985 Patent application No. 56589 2, Name of the invention Tape guide Drum filling 3, relationship with the amended case Patent applicant address 3-12 Moriya-cho, Kanayō-ku, Yokohama-shi, Kanagawa 221 Name (432) Victor Japan Co., Ltd. Representative Director and President Michi Shishi - Department 4; Agent address: 5-7-6 Kojimachi, Chiyoda-ku, Tokyo 102
, Detailed description of the invention in the specification to be amended. 7. Contents of amendment c'l) In the specification, "9" written on page 7, line 11 has been changed to "
10”. ■ "Between sections" written in the 4th line of page 10 of the same document is "section"
and correct it.

Claims (3)

[Claims] (1) Consisting of a lower fixed drum and an upper rotating drum, the rotating drum is equipped with a pair of rotating magnetic heads arranged at a predetermined angular interval in the circumferential direction, and the drum has a high height in the axial direction. A plurality of sets of rotating magnetic heads with different heights are provided, and each set of rotating magnetic heads separates different types of information signals in the width direction of the magnetic tape that runs around the magnetic tape over a predetermined angular range. A tape guide drum device that guides the magnetic tape so as to record on a magnetic tape area and reproduce the same, wherein recesses are formed in the outer circumferential surface of the rotary drum at locations between the sets of rotating magnetic heads. A tape guide drum device characterized by: (2) The device according to claim 1, wherein the recess is a groove formed around the entire circumference of the rotating drum. (3) The device according to claim 1, wherein the recess is formed locally to correspond to the rotating magnetic head.