JPS6379222A - Head drum device - Google Patents

Abstract

PURPOSE:To compactly compose a head drum by arranging a stationary drum at the upper and lower sides of a head drum, inserting a feed screw so as to penetrate a guide sleeve and moving the head drum in the axial direction by this screw. CONSTITUTION:When a head drum 10 is driven with its rotation by a motor 17 by electrifying a coil 18, a magnetic head 12 abuts a magnetic tape 35 and the head drum 10 is moved in the axial direction by a motor 33 simultaneously with the rotation of the head 12. Namely the head drum 10 guided by a guide rod 28 via the upper and lower stationary drums 15, 16 is fed in the axial direction via a feed screw 31 with the rotation of the motor 33. Plural tracks are formed in parallel each other in element the same direction as to length direction of the magnetic tape on the surface of the magnetic tape running with the rotation of such drum 10 and movement in the axial direction and the magnetic recording of a parallel scanning method can thus be achieved.

Description

[Detailed description of the invention]

FIELD OF INDUSTRIAL APPLICATION 1 The present invention relates to a recording and reproducing device that performs recording and/or reproduction using a tape-shaped recording medium, and particularly relates to a recording and reproducing device that uses a tape-shaped recording medium to circumferentially wind the tape-shaped recording medium around the outer peripheral surface of a head drum. At the same time, by moving a head drum equipped with a rotating head in the axial direction, a plurality of tracks are formed on the surface of the tape-shaped recording medium, parallel to each other and extending in a direction that substantially coincides with the length direction of the tape-shaped recording medium. The present invention relates to a head drum device configured to form a head drum. (Summary of the Invention) The present invention provides a magnetic recording and reproducing system in which a tape-shaped recording medium is wound in parallel around a rotating head drum, and recording and/or reproduction is performed while the drum is fed in the axial direction of the drum or in the width direction of the tape. In the device, a guide sleeve is arranged in the center of the head drum, and fixed drums are arranged above and below, respectively, and the head drum is moved in the axial direction by a feed screw or a guide rod passing through the guide sleeve, or The present invention provides a head drum device which is suitable for a parallel scan type magnetic recording and reproducing device. K. Prior Art In a conventional magnetic recording and reproducing device using a rotating head, The helical scan method, in which the magnetic tape is wound diagonally around the drum, is widely used.Since this method winds the magnetic tape diagonally around the drum, the tape running system is complicated and requires adjustment. In addition, the helical scan method uses a capstan and a pinch roller to feed the magnetic tape in its length direction to advance the track pitch. There is a limit to the accuracy of pitch feed that can be obtained due to factors such as slippage between the capstan and the pinch roller, and it is not always possible to obtain sufficient accuracy if the track becomes narrower than the current one. There is no guarantee that it will be possible.

[Problems to be solved by the invention]

In order to put a digital VTR into practical use in a compact form, higher density recording is required. One measure to cope with such high-density recording is to reduce the track pitch. In this case, the accuracy required for the linearity of the track to ensure compatibility of the narrower track becomes stricter, and it becomes necessary to increase the accuracy of pitch feeding. Therefore, in order to achieve high-density pitch feeding that is difficult to achieve with conventional tape feeding using capstans and pinch rollers, a rotating head is used together with a head drum as disclosed in, for example, Japanese Patent Laid-Open No. 52-26807. A parallel scan method has been proposed in which recording and/or reproduction is performed while feeding in the axial direction. Such a parallel scan method requires a mechanism that reliably and highly accurately moves the rotary head in the axial direction. The present invention has been made in view of these problems, and an object of the present invention is to provide a head drum device that can reliably move the head drum in the axial direction and cause it to reciprocate. It is. Means for Solving Problem K] The present invention provides a tape-shaped recording medium that is wound around the outer peripheral surface of a head drum in the circumferential direction, and the head drum that is provided with a rotary head is moved in the axial direction. In an apparatus for forming a plurality of tracks on the surface of a tape-shaped recording medium that are parallel to each other and extend in a direction that substantially coincides with the length direction of the tape-shaped recording medium, a guide sleeve disposed at the center The head drum is rotatably attached to the head drum, fixed drums are arranged above and below the head drum, and a feed screw or guide rod is inserted through the guide sleeve, and the feed screw or guide rod The head drum is moved in the axial direction or guided in the axial direction.

[effect] According to the invention, therefore, it is possible to move or guide the head drum in the axial direction by means of a lead screw or a guide rod passing through a guide sleeve arranged in the center of the head drum, thereby making it possible to move it in the axial direction. It becomes possible to configure the head drum compactly. In addition, the fixed drums arranged above and below make it possible to lengthen the guide span, thereby increasing the precision of guiding the head drum that moves in the axial direction, making it suitable for a head drum device suitable for a movable drum mechanism. It becomes possible to provide K Example]

1 and 2 show a head drum device according to a first embodiment, and this head drum device has a head drum 1.
It is equipped with 0. A small opening 11 is formed in the outer peripheral surface of the head drum 10, and a magnetic head 12 is mounted so as to face this opening 11. Further, the spatula drum 10 is rotatably supported via a ball bearing 13 by a guide sleeve 14 which is disposed so as to penetrate through the center thereof. Fixed drums 15 and 16 are disposed above and below the head drum 10, respectively, and these drums 15 and 16 are fixed to the upper and lower portions of the guide sleeve 14, respectively. A motor 17 is provided between the lower fixed drum 16 and the head drum 10, and the head drum 10 is driven by the motor 17. The fixed drum 16 also serves as a stator yoke of the motor 17, and a stator coil 18 is attached thereto. On the other hand, a rotor magnet 19 is fixed to the lower surface of the head drum 10, and by energizing the coil 18,
A head drum 10 including a magnet 19 is rotatably driven. A rotary transformer 20 is disposed between the head drum 10 and the upper fixed drum 15, and its rotor 21 and stator 22 are supported by the drums 10 and 15, respectively. In addition, in the vicinity of the rotor 21 of the 〇-Tali transformer 20,
A magnet 23 is attached to the upper surface of the head drum 10, and a rotation detection coil 24 is attached to the lower surface of the fixed drum 15 so as to face the magnet 23. The rotation of the head drum 10 is detected by the coil 24. As shown in FIG. 2, the upper and lower drums 15 and 16 have protrusions 25 formed on the left and right sides of the back side, and the protrusions 25 are provided with through holes 26.
6 through the slide bearing 27 to the guide rod 28
are fitted. The guide rod 28 is adapted to axially guide the rotating head drum 10, which is supported by the upper and lower drums 15,16. Further, the guide rod 28 has a small diameter portion 29 formed in its middle portion, and this small diameter portion 28
constitutes the tape guide. On the other hand, a female threaded hole 30 is formed in the center of the idle sleeve 14, which is arranged at the center of the head drum 10, and a feed screw 31 is inserted through it so as to engage with this female threaded hole 30. There is. And the feed screw 31 is on the chassis 32! i! It constitutes the output shaft of the motor 33 attached thereto. Therefore, the motor 33 feeds the head drum 10 in the axial direction via the feed screw 31. Further, a compression coil spring 34 is disposed between the chassis 32 and the lower fixed drum 16 to eliminate backlash of the feed screw 31. In the above structure, the head drum 10 constitutes a fully rotating drum, and as shown in FIG. 2, the magnetic tape 35 is wound over more than 180 degrees. By energizing the coil 18, the motor 17 rotates the head drum 10, and the magnetic head 12 supported by the drum 10 comes into contact with the magnetic tape 35. . In synchronization with the rotational movement of the rotating head 10, the motor 3
3, the head drum 10 is moved in the axial direction. i.e. upper and lower fixed drums 14.15
The head drum 10 , which is guided by the guide rod 28 via the feed screw 31 , is sent in the axial direction via the feed screw 31 by the rotation of the motor 33 . Due to the rotation and axial movement of the head drum 10, a plurality of tracks are formed parallel to each other on the surface of the running magnetic tape 35 in a direction that substantially coincides with the length direction of the magnetic tape 35. This makes it possible to achieve parallel scan type magnetic recording. The transmission and reception of signals between the magnetic head 12 on the rotating head drum 10 and the stationary side is achieved by a rotary transformer 20. Further, the rotational speed of the head drum 10 is detected by a rotation detection coil 24, and the motor 17.33 is controlled in response to this rotation detection. According to the VTR of this embodiment, the magnetic tape 35 is wound in parallel around the head drum 10. It becomes possible to configure a tape running system that runs while keeping the height of the tape 35 constant. This simplifies the complicated tape running system that changes the tape height by tilting the guides, which was the fate of the helical scan method, reduces material costs by reducing the number of components, and simplifies adjustment of the tape running system. This makes it possible to reduce manufacturing costs. In addition, by achieving track pitch feeding by moving the head drum 10 in the width direction of the magnetic tape 35, factors such as expansion and contraction of the magnetic tape 35 due to fluctuations in tape tension and slipping between the capstan and the pinch roller can be eliminated. As a result, higher accuracy in pitch feed can be expected. Further, according to the VTR of this embodiment, the movement of the head drum 10 in the axial direction is performed by the motor 33 and the feed screw 31, and in particular, since the feed screw 31 is directly driven by the motor 33, This brings about the advantage that the controllability of the feed screw 31 becomes better. In addition, the guide rod 28 is connected to the upper and lower fixed drums 15.
．． Since the head drum 10 is guided by the section 16, it is possible to lengthen the guide span and improve the precision of the guidance, making this head drum suitable for a movable drum mechanism. It becomes a device. Next, a second embodiment will be explained with reference to FIGS. 3 and 4. In this embodiment, parts corresponding to those in the first embodiment are given the same reference numerals, and descriptions of parts having the same configuration will be omitted. The feature of this embodiment is that a through hole 26 is formed in the center of the guide sleeve 14, and a slide bearing 27 is formed in this through hole 26.
The guide rod 28 is slidably fitted therebetween. A female threaded hole 30 is formed in the protrusion 25 of the guide block 36 that connects the upper and lower fixed drums 15, 16 on the back side, and a feed screw 31 is engaged with this female threaded hole 30. Note that the feed screw 31 is directly connected to the output shaft of the motor 33, and
A compression coil spring 34 is disposed between the guide block 36 and the guide block 36 to eliminate backlash of the feed screw 31. Even in such an embodiment, while the head drum 10 is rotationally driven by the motor 17 on the lower drum 16, the head drum 10 is moved in the axial direction by the motor 33 and the feed screw 31 via the guide plotter 36. I have to. As a result, a plurality of tracks are formed on the magnetic tape circumferentially wound around the outer peripheral surface of the head drum 10, which are parallel to each other and extend in a direction that substantially coincides with the length direction of the magnetic tape. ing. This achieves parallel scanning similar to that of the first embodiment. Also in this embodiment, the upper and lower drums 15, 16
Therefore, the guide span of the guide mechanism for moving the head drum 10 in the axial direction is made longer, thereby increasing the precision of the guide. [Effects of the Invention] As described above, in the present invention, the head drum is rotatably attached to the guide sleeve disposed at the center, and fixed drums are disposed above and below the head drum, so that the guide sleeve can be penetrated. A feed screw or guide rod is inserted through the head drum so that the head drum is moved or guided in the axial direction by the feed screw or guide rod. Therefore, according to such a configuration, it is possible to perform recording and/or reproduction while moving the head drum in the axial direction with respect to the tape-shaped recording medium that is circumferentially wound around the outer peripheral surface of the tape-shaped recording medium. It becomes possible to provide a head drum device used in a parallel scan type recording/reproducing device.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of a head drum according to a first embodiment of the present invention, FIG. 2 is a plan view thereof, FIG. 3 is a plan view of a head drum according to a second embodiment, and FIG. It is a sectional view taken along the line IV to ■ in the figure. In addition, in the symbols used in the drawings, 10φ...Head drum 12...Magnetic head 13...Ball bearing 14...Guide sleeve 15...Fixed drum (upper) 16...Fixed drum (lower) 28 ...Guide rod 31...Feed screw 35...Magnetic tape. Cheer N N taste 211φko

Claims (1)

[Claims] By winding a tape-shaped recording medium in the circumferential direction around the outer circumferential surface of the head drum and moving the head drum including a rotating head in the axial direction, the tape-shaped recording medium is wound parallel to the surface of the tape-shaped recording medium. In an apparatus for forming a plurality of tracks extending in a direction substantially coinciding with the length direction of a tape-shaped recording medium, the head drum is rotatably attached to a guide sleeve disposed at the center, and the head drum is A feed screw or a guide rod is inserted through the guide sleeve, and the head drum is moved in the axial direction by the feed screw or the guide rod. A head drum device characterized in that the head drum device is configured to guide the user.