JPH04147413A - Rotary head drum - Google Patents

Abstract

PURPOSE:To eliminate an inclination guide and set the height of rotary head drum to be the same as the width of a tape by vertically arranging the rotary head drum with respect to the travel direction of the tape. CONSTITUTION:The rotary head drums 1 and 2 are vertically arranged with respect to the travel direction of the tape and only a magnetic head 6 is scanned obliquely with respect to the magnetic tape. Thus, the inclination guide is eliminated and the tape guide can be made vertical with respect to the travel direction of the tape. Thus, the friction force of the magnetic tape in the lateral direction with respect to the tape guide becomes uniform and the travel of the tape is stabilized. Then, the damage of the magnetic tape can considerably be reduced. The design allowance of a tape travel system can considerably be increased and the rotary head drums 1 and 2 in a magnetic recording and reproducing device whose reliability is high can be obtained. Furthermore, the height of the rotary head drums 1 and 2 can be set equal to the tape width and it can be miproved. Thus, the rotary head drums 1 and 2 in the magnetic recording and reproducing device which is thin and small can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a rotary head drum for driving and controlling the attitude and height of a magnetic head in a magnetic recording/reproducing device.

[Prior Art] FIG. 13 is a cross-sectional view showing a conventional rotary head drum disclosed in, for example, Japanese Unexamined Patent Publication No. 63-76101.

In the figure, 51 is a rotating upper drum, and this rotating upper drum 51 receives power from a motor 54 via a shaft 53 and rotates at high speed. Further, a magnetic head 55 is attached to the circumference of the upper rotating drum 51 so as to protrude by a predetermined amount. 5
Reference numeral 2 denotes a fixed lower drum, and the fixed lower drum 52 is provided with a tape guide lead 52c so that the magnetic tape 100 is wound around the rotary head drum 50 at a predetermined inclination angle. The fixed lower drum 52 is fixed to the deck base 3 at an angle.

FIG. 14 is a perspective view of a main part of a conventional magnetic recording/reproducing apparatus using a rotating head drum.

In the figure, 61 is an entrance tape guide roller, 62 is an entrance inclined guide, 63 is an exit inclined guide, and 64 is an exit tape guide roller. Wrap it in place. Note that the entrance tape guide roller 61 and the exit tape guide roller 64
The flanges 61a, 64a and the tape guide lead 52c of the fixed lower drum 52 regulate the position of the magnetic tape I00 in the width direction, and the entrance inclined guide 62
By tilting the magnetic tape 100 using the exit tilt guide 63, the magnetic tape 100 is wound around a predetermined angle at a predetermined position on the outer periphery of the rotary head drum 50 so as to run stably. The rotary head drum 50 records or reproduces signals on the magnetic tape 100 by rotating at a predetermined number of rotations.

[Problems to be Solved by the Invention] Since the conventional rotary head drum is constructed as described above, the magnetic tape is pulled out from a cassette loaded with magnetic tape in parallel and wound around the rotary head drum at a predetermined angle. For this purpose, a tape guide that is inclined with respect to the deck base is always required, and since the magnetic tape runs diagonally with respect to the rotating head drum and this inclined guide, the frictional force becomes uneven in the width direction of the magnetic tape. (The tape running becomes unstable. In particular, when the magnetic tape is run in reverse, the magnetic tape tends to fluctuate in the width direction, which may prevent proper signal recording and playback. A large number of tape guides are required for the number of guides, which increases the size of the magnetic recording/reproducing device.Furthermore, since this slanted guide cannot be made into a roller (rotating tape guide), the friction between the magnetic tape and the tape guide causes This increases the running load on the magnetic tape, making it difficult to run stably on magnetic tapes with smooth surfaces such as metal tapes.Also, because the rotating head drum is inclined with respect to the magnetic tape, this rotation The height of the head drum must be at least twice the width of the tape, resulting in problems such as an increase in the thickness of the magnetic recording/reproducing device.

This invention was made to solve the above-mentioned problems, and it stabilizes the tape running, the tape position does not change even if the tape running is reversed, and the tape running load is small.
To obtain a rotary head drum which has a small number of tape guides and a low height of the drum, and can therefore be made thin and small, hardly damaging the tape, and capable of configuring a highly reliable, high-performance magnetic recording and reproducing device.

[Means for Solving the Problems] A rotary head drum according to the present invention includes an upper fixed drum and a lower fixed drum, each of which has a sliding portion on its outer circumference that guides a magnetic tape, on a deck base that is a reference surface of a magnetic recording and reproducing device. A rotary head disk that rotates around an inclined shaft that is arranged perpendicularly to the upper fixed drum and the lower fixed drum and tilted at a predetermined angle with respect to the upper fixed drum and the lower fixed drum in the gap between the upper fixed drum and the lower fixed drum. and a magnetic head drive mechanism that supports a magnetic head that is disposed on the rotating head disk and records and reproduces signals on the magnetic tape, and the magnetic head drive mechanism moves the magnetic head in the direction of the tilted axis. and a drive section that drives the magnetic head so as to be tiltable in the azimuth angle direction of the magnetic head.

[Function] The rotating head drum in this invention is arranged perpendicular to the tape running direction, eliminating the need for an inclined guide.
Further, the height of this rotary head drum may be approximately the same as the tape width. Since the magnetic head is movable in the direction of the inclined axis of the rotary head drum, the trajectory of the magnetic head for recording and reproducing signals on the magnetic tape is made to be a good straight line. Furthermore, since the inclination of the magnetic head in the azimuth angle direction is made variable, the azimuth angle on the recording track can be kept constant.

[Example] Hereinafter, this invention will be explained based on the drawings.

FIG. 1 is a cross-sectional side view showing a rotary head drum according to an embodiment of the present invention.

In the figure, reference numerals 1 and 2 denote upper and lower fixed drums, each having a tape sliding surface on the outer periphery.Furthermore, this lower fixed drum 2 is provided with a tape guide lead 2a for regulating and positioning the tape in the width direction. It is fixed perpendicular to 3. Reference numeral 4 denotes a rotary head disk, which is disposed in the gap between the upper and lower fixed drums 1 and 2, and is rotatably mounted on a bearing 9 around a shaft 5 that is erected at an angle with respect to the upper and lower fixed drums 32. is held through.

Further, a magnetic head 6 is fixed to the rotary head disk 4 via a magnetic head drive mechanism 7 so as to protrude by a predetermined amount from the outer periphery of the upper and lower fixed drums 1.2. Also,
A PG head IO is attached to the fixed lower drum 2, and a magnet II is attached to the rotary head disk 4 in correspondence with this, so that the rotational phase of the rotary head disk 4 is detected.

Next, a magnetic head drive mechanism according to an embodiment of the present invention will be described with reference to FIGS. 2 to 7.

In FIG. 2, 71 is a permanent magnet, and a center yoke 72 fixed coaxially with this permanent magnet 71, an outer yoke 73 arranged concentrically with this center yoke 72, and the above permanent magnet 71 are fixed. The upper yoke 74 and the lower yoke 75 constitute a magnetic path. Reference numerals 76 to 79 denote leaf springs, the outer peripheries of which are fixed to the outer yoke 73 or the upper and lower yokes 74, 75, and first and second coil pobins to which the first and second coils 80, 81 are respectively fixed. 82.83 above center yoke 7
2 and the outer yoke 73 so as to be movable in the direction of the central axis of the center yoke 72.

Further, the leaf springs 77 and 79 have extension portions 77a and 79.
a is formed, and the magnetic head 6 is attached so as to straddle these extending portions 77a and 79a.

Next, the operation will be explained.

Tape guide lead 2 of fixed lower drum 2 shown in Figure 1
When the magnetic tape 100 is transferred along the direction a and the rotary head disk 4 makes a predetermined rotation, the magnetic head 6 moves to the magnetic tape 1 when the magnetic head drive device 7 does not operate.
00, a non-linear trajectory a deviated from the straight trajectory is scanned as shown in FIG. 8(a). Therefore, by applying a voltage to the magnetic head drive mechanism 7 that supports the magnetic head 6, the magnetic head 6 can move in the direction of the tilt axis of the rotary head drum and scan a linear trajectory.

That is, the coils 80 and 8 of the magnetic head drive mechanism 7
A predetermined drive voltage is applied to 1 based on the phase information of the rotating disk 4 obtained from the PG head 10, and the coil bobbins 82 and 83 move against the center yoke due to repulsion from the magnetic field created by the center yoke 72 and the outer yoke 73. leaf springs 76, 77, 78 and 7.
9 deforms and the extensions 77 of these leaf springs 77 and 79
a and 79a move in the direction of the central axis of the center yoke 72. At this time, by applying a predetermined voltage to each of the two coils 80 and 81 independently and changing the relative position of the leaf springs 77 and 79, the azimuth angle θ is also adjusted relative to the scanning locus of the magnetic head 6. Can be held at a predetermined angle. That is, two coils 80.
If the same applied voltage is applied to coil bobbin 81,
Since the magnetic heads 2 and 83 always move in the same direction and the same distance, the magnetic head 6 is not twisted in the azimuth angle direction with respect to the magnetic head drive mechanism 7.

Therefore, as shown in FIG. 9(a), although the scanning trajectory of the magnetic head can be easily corrected from a non-linear trajectory a to a linear trajectory, the azimuth angle is not corrected but is translated in parallel. Therefore, if the angle at which the non-linear trajectory a and the linear trajectory intersect is α, then the magnetic head 6 that scans the linear trajectory
The azimuth angle of is large (varies) from θ+α to θ−α, and there is a risk that compatibility with other recording/reproducing devices cannot be maintained.However, if different applied voltages are applied to the coils 80 and 81, The magnetic head 6 moves while the relative height relationship between the leaf spring extensions 77a and 79a deviates, and the magnetic head 6 is twisted in the azimuth angle direction due to the effect of this relative height relationship deviation. Therefore, by applying a predetermined voltage to the coils 80 and 81 according to the rotational position of the magnetic head 6, as shown in FIG. Scanning with a constant azimuth angle is possible.

In the above embodiment, the extending portion 79a of the leaf spring of the magnetic head drive mechanism 7 is bent, but as shown in FIG.
You can also fix it.

Further, in the above embodiment, the coils 80 and 81 of the magnetic head drive mechanism 7 are arranged along the center yoke 72.
As shown in FIG. 11, it may be arranged concentrically with the center yoke 72.

Furthermore, in the above embodiment, the upper fixed drum 1 and the lower fixed drum 2 are cylindrical, but as shown in FIG. If the inclination angle is large, the change in the amount of protrusion of the magnetic head 6 is corrected.

Further, in the above embodiment, the magnetic tape 1 is attached to the lower fixed drum 2.
Tape guide lead 2 for positioning and regulating the width direction of 00
A is provided, but the upper fixed drum L or the lower fixed drum 2
It is sufficient if there is a positioning regulating member for the magnetic tape 100 as necessary.

[Effects of the Invention] As described above, according to the present invention, the rotary head drum is arranged perpendicularly to the tape running direction, and only the magnetic head scans diagonally with respect to the magnetic tape, so that the inclined guide Since the tape guide can be made entirely perpendicular to the tape running direction, the frictional force in the width direction of the magnetic tape against the tape guide is uniform, stabilizing the tape running and greatly reducing damage to the magnetic tape.
In addition, the design latitude of the tape running system is greatly increased, and a highly reliable rotating head drum of a magnetic recording/reproducing device can be obtained. Since the height of the rotating head drum can be approximately the same as the tape width,
Therefore, it is possible to obtain a rotary head drum for a magnetic recording/reproducing device that is thin and small.

In addition, since the height and inclination of the magnetic head are controlled by the magnetic head drive device, the magnetic head can scan the magnetic tape in a good straight line, and the azimuth angle does not change, allowing good signal recording and playback. This has the effect of providing a rotary head drum for a magnetic recording/reproducing device that can be used.

[Brief explanation of drawings]

FIG. 1 is a sectional side view showing a rotary head drum according to an embodiment of the invention, FIG. 2 is a sectional side view showing a magnetic head drive mechanism according to an embodiment of the invention, and FIGS. FIG. 7 is a plan view showing a leaf spring in a magnetic head drive mechanism according to an embodiment of the invention, FIG. 7 is a perspective view of a part of the magnetic head drive mechanism according to an embodiment of the invention, and FIG. 8 is an embodiment of the invention. FIG. 9 is a conceptual diagram showing the scanning trajectory of the magnetic head with respect to the magnetic tape according to an embodiment of the present invention, and FIG. FIG. 11 is a perspective view showing another embodiment of the plate spring part of the magnetic head drive mechanism, FIG. 11 is a sectional view showing another embodiment of the coil part of the magnetic head drive mechanism of the present invention, and FIG. A plan view and a side view showing another example of the outer peripheral shape of the upper and lower fixed drums, FIG. 13 is a sectional view showing a conventional rotating head drum, and FIG. 14 is a magnetic recording and reproducing example using a conventional rotating head drum. FIG. 2 is a perspective view of the main parts of the device. In the figure, ■ indicates the upper fixed drum, 2 indicates the lower fixed drum, and 3
is a deck base, 4 is a rotating head disk, 5 is a shaft, 6
7 is a magnetic head, 7 is a magnetic head drive mechanism, 71 is a permanent magnet in the magnetic head drive mechanism, 72 is a center yoke in the magnetic head drive mechanism, 73 is an outer yoke in the magnetic head drive mechanism, and 74 is an upper yoke in the magnetic head drive mechanism. , 75 is a lower yoke in the magnetic head drive mechanism, 76 to 79 are leaf springs in the magnetic head drive mechanism, 77a and 79a are extensions thereof, 80 and 81 are coils in the magnetic head drive mechanism, and 82 and 83 are magnetic This is a coil bobbin in a head drive mechanism. In each figure, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Scope of Claims] In a rotating head drum of a magnetic recording and reproducing apparatus that extracts the magnetic tape from a supply reel and a take-up reel on which the magnetic tape is wound and records or reproduces signals, there is provided a slide for guiding the magnetic tape on the outer periphery. An upper fixed drum and a lower fixed drum provided with moving parts are arranged perpendicularly to the deck base, which is the reference plane of the magnetic recording/reproducing device, and the upper fixed drum and the lower fixed drum are arranged in the gap between the upper fixed drum and the lower fixed drum. A rotary head disk that rotates around an inclined shaft that is tilted at a predetermined angle with respect to the lower fixed drum, and supports a magnetic head that is placed on the rotary head disk and records and reproduces signals on the magnetic tape. the magnetic head drive mechanism includes a drive section that moves the magnetic head in the direction of the tilt axis, and a drive section that drives the magnetic head so as to be tiltable in the azimuth angle direction of the magnetic head. A rotating head drum comprising: