JPS5832265A - Magnetic recorder and reproducer - Google Patents

Abstract

PURPOSE:To make an air film layer, uniform through the prevention of partial lack of the air film layer near a groove, by providing projections at the bottom of a groove of a rotary head continuously. CONSTITUTION:A plurality of projections having almost the same height are continuously formed on the bottom in a groove 5 of a rotary drum 1 at equal intervals. Thus, when the rotary drum 1 is rotated, air is pushed out toward the arrow F by the projections 9, and through this air flow, a counter part of a tape 8 to the groove 5 is pushed at the outside of the drum 1 partially, allowing to float the tape 8 entirely from the rotary drum 1 to an almost uniform position. Thus, a stable head touch can be obtained near the groove without giving damage to the tape 8.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic recording/reproducing device, and particularly aims to make an air film layer uniform on a rotating drum.

Conventionally, magnetic recording and reproducing apparatuses equipped with fully rotating drums have required some type of tape regulating means to stably run the tape on the rotating drum. One structure for this purpose is to provide a groove on the outer circumferential surface of the rotating drum, insert an object such as a bottle into the groove, and use the protrusion to regulate the tape.

A perspective view of the rotating drum of the main device is shown.

In the figure, reference numeral 1 denotes a rotating drum that is attached to a disk (not shown) that is integrally fixed to a main shaft (not shown) and that is adjusted to an accuracy of several μm. Video heads 2 that protrude at a predetermined distance are provided 1800 times opposite to each other. 3 is a fixed part having a bearing part. This fixing part 3 is attached to a tape regulating bin 4 by means of a screw 6.
is fixed, and the tip of the tape regulating bottle 4 is inserted into a groove 5 provided in the rotary drum 1. 7 is a rotating drum and a driving motor for rotating 1; Reference numeral 8 denotes a tape, and this tape 8 is regulated by an inlet post 9, an outlet post 1o, and a tape regulating bin 4 so that it can run stably 1 on the rotating drum 1.

FIG. 2 is a sectional view showing the position of the tape regulating bin 4 shown in FIG. 1, and shows that the position of the tape is regulated by the dimension A of the tape regulating bin 4.

A drawback of the rotating drum of the magnetic recording/reproducing apparatus having the above structure is that the formation of the air film layer between the tape 8 and the circumferential surface of the rotating drum 10 is locally inhibited in the grooves 6. The smaller the depth and width of the groove 6, the more
Although it has been experimentally confirmed that the influence of inhibiting the formation of the air film layer is reduced, there is a limit to how small the groove 6 can be made, and it cannot be made smaller than a certain value.

To explain this problem in more detail, FIG. 3 is a developed view showing the positional relationship among the rotary drum 1, tape 8, and groove 5. In the vicinity of B in the figure, the air film layer is relatively thick and stable because it is close to the tape entrance side and the tape 8 has never reached groove 5K, but in the vicinity of C, it is far from the tape entrance side and the tape , 8 over the groove 6, the air film layer is thin and unstable.

FIG. 4 is a sectional view showing the tape floating state at position B in FIG. 3, and shows that an air film layer H is formed between the drum 1 and the tape 8.

FIG. 5 is a sectional view showing the tape floating state at position C in FIG. 3. FIG.

As is clear from the figure, the floating effect of the tape 8 is hindered by the grooves 5 (that is, the formation of the air film layer is inhibited), and the tape 8 comes into contact with the edges 5a and 5°b of the grooves 5, damaging the tape 8. Furthermore, local deformation of the tape 8 causes uneven head touch, making it impossible to obtain good head output.

As explained above, in the rotary head of the conventional magnetic recording/reproducing device, the formation of the air film layer is locally blocked by the grooves, and the rotary drum and tape come into contact, which is the main cause of tape damage. Furthermore, tape deformation caused by non-uniformity of the flying height of the tip causes poor or unstable head touch, which poses a major problem in terms of life and performance.

The present invention has been made in order to eliminate the above-mentioned conventional drawbacks, and by providing a convex portion continuously along the substantially axial direction on the bottom surface of the groove of the rotor, the air film layer in the vicinity of the groove can be improved. This prevents localized deficiency.

DESCRIPTION OF THE PREFERRED EMBODIMENTS A magnetic recording/reproducing apparatus according to an embodiment of the present invention will be described in detail below with reference to the drawings.

The sixth tooth indicates a rotating drum of a magnetic recording/reproducing apparatus according to an embodiment of the present invention, and the same parts as in the conventional example are given the same numbers.

A feature of the rotary drum is that a plurality of convex portions 9 having approximately the same height are provided on the bottom surface of the groove 5 at equal intervals. The other parts 1, such as the video head, the door 2, the fixing part 3, the tape regulating bin 4, etc., have the same structure as the conventional example shown in FIG.

FIG. 7 shows the DD section ml of the rotating drum of FIG. 6. Now, when the rotary drum 1 rotates in the direction of the arrow E, the air near the convex portion 9 is pushed out in the direction of the arrow F, acting to levitate the tape near the groove.

FIG. 8 shows the floating state of the tape 8 at the same position as FIG. 5, which shows the conventional example. As is clear from the figure, when the rotating drum 1 rotates, air is pushed out by the convex portion 9 in the direction of arrow F, and this airflow locally pushes the portion of the tape 8 facing the groove 5 to the outside of the rotating drum. , the entire tape can be floated to a substantially uniform position above the rotating drum 1. In this way, a stable head touch can be obtained in the vicinity of the groove without damaging the tape.

FIG. 9 shows another embodiment of the magnetic recording/reproducing head of the present invention, in which the air supply hole 10 is replaced by the curved portion 9 in FIG.
By providing air between the tapes, air can be sent and suspended more effectively, increasing the floating effect of the tape. .

As explained above, the magnetic recording/reproducing device of the present invention makes effective use of the groove for inserting the tape regulating pin, which is essential in a rotating drum, and continuously provides a convex portion on the bottom surface of the groove. The air film layer for floating can be uniformly formed, and the convex portions can be easily formed by knurling, etc., so it has great industrial utility value.

[Brief explanation of the drawing]

Figure 1 is a perspective view of the area around the rotating drum of a conventional recording/reproducing device, Figure 2 is a sectional view of the position of the tape regulation bin in the same device, and Figure 3 shows the relative positional relationship between the rotating drum, tape, and groove in the same device. FIG. 4 is a diagram showing the state of tape floating near the tape input side in the same device. FIG. 6 is a diagram showing the state of tape floating near the tape exit side in the same device. FIG. 7 is a front view of a rotating drum of a recording/reproducing device according to an embodiment of the invention, FIG. 7 is a diagram showing air flow due to a convex portion provided in the groove of the rotating drum in the same device, and FIG. 8 is a diagram showing the tape exit side of the same device. FIG. 9 is a diagram showing another embodiment of the present invention, which shows the floating state of the tape in the vicinity.・・0. -Video head, 3, Fixed part, 4, Tape regulating pin, 5°... Groove, 7... Drive motor, 9... ...Convex O'Agent's name: Patent attorney Toshi Nakao - 1 other person Figure 2 Figure 3 Figure 4! l/Fig. 5 No. 6WJ

Claims (1)

[Claims] A magnetic recording and reproducing device in which protrusions are inserted into grooves provided along the outer peripheral surface of a rotating drum, and the protrusions regulate and run the tape, and the protrusions are continuously formed on the bottom surface of the grooves. A magnetic recording/reproducing device characterized by: