JPH04252402A - Rotary head type magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To surely set the signal transmission lines of the head without being disturbed by the miniaturization, etc., of the device by forming the signal transmission lines to the rotary magnetic head in the rotary head cylinder or the supporting shaft of a head supporting member. CONSTITUTION:In the rotary magnetic head 100, when a driving motor rotates, a rotary cylinder part 30 also rotates; when for example a reproducing signal is taken out from a video tape which is wrapped around the device 100 to travel, magnetic signals corresponding to a prescribed azimuth are detected by head chips 36a-36d, and through a repeater substrate 35 and by means of bunch lines 39 which are the signal transmission lines formed in the driving shaft 32 that is the supporting shaft of the head cylinder, are transported to each of corresponding coils on a rotor 38. Thus, the inside of the supporting shaft of the head cylinder is utilized as the signal transmission lines of the head.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary magnetic recording/reproducing device such as a video tape recorder, and more particularly to an improvement in the arrangement of a signal transmission path to a rotary head in such a device.

0002

2. Description of the Related Art A rotary magnetic head device for a video tape recorder (hereinafter referred to as VTR), which is an example of a conventional device of this type, is constructed as shown in FIG. 4, as is well known. That is, the rotary magnetic head device 10 has a first head chip 1a for recording and reproduction and a second head chip 1a for recording and reproduction at symmetrical positions in the diametrical direction on the lower surface of a rotary cylinder 1 made of a thick disc made of aluminum alloy or the like. The head chips 1b are fixed with the tips of each head chip facing the outer peripheral edge. The rotating cylinder 1 is integrally attached to the drive shaft 2 by fixing its center portion to a flange 3 coaxially press-fitted onto the drive shaft 2, which is rotated by a drive motor (not shown). A thin donut-shaped rotor 4a of a rotary transformer 4 is fixed to the lower surface of the flange 3 coaxially with the shaft 2 by adhesive or the like. The rotary transformer 4 electromagnetically converts a recording or reproduction signal and sends and receives it to the head chips 1a and 1b, and two concentric grooves are formed on the lower surface of the rotor 4a. A thin copper wire is wound in each groove a predetermined number of times to form first and second coils. For example, the first coil wound in the first groove is A second coil, which is connected to the first head chip 1a and wound around the second groove, is connected to the second head chip 1b.

A rotary bearing 5 made of a ball bearing is press-fitted slightly above the center of the shaft 2, and a ball having a slightly smaller outer diameter than the ball bearing is mounted near the lower end of the shaft 2. A rotary bearing 6 made of a bearing is press-fitted and fixed. A hollow torch-shaped fixed cylinder 7 made of aluminum alloy or the like is press-fitted into the two bearings 5 and 6 and coaxially disposed on the shaft 2. A circular cylinder part 7b is formed at the upper part of the fixed cylinder 7 by an outer circumferential wall 7a having a predetermined width, and the outer ring of the bearing 5 is fixed to the center of the bottom surface of this cylinder part 7b. The drive shaft 2 is rotatably supported within the fixed cylinder 7 by fixing the outer ring of the bearing 6 therein. Further, a thin donut-shaped stator 4b of the rotary transformer 4 is fixed to the bottom surface of the cylinder portion 7b with an adhesive or the like, and is disposed around the shaft 2. The stator 4b and the rotor 4a are arranged facing each other so as to maintain a predetermined minute interval, and constitute a rotary transformer 4 of a planar facing type. First and second coils are disposed on the upper surface of the stator 4b, similar to the rotor 4a, and the first and second coils disposed on the stator 4b are respectively disposed on the rotor 4a. The above first and second
The signal current to be magnetically recorded and the signal current to be magnetically reproduced flow through this coil. The fixed cylinder 7 is fixed to the VTR body (not shown) by appropriate means.

The operation of the rotary magnetic head device 10 constructed in this manner will be explained. As is well known, the video tape loaded in the VTR is tilted at an angle of 180 degrees with respect to the rotary cylinder 1 and fixed cylinder 7.
Because it is wrapped at an angle of ° + α ° and runs at high speed,
The rotating cylinder 1 rotates at high speed in the opposite direction to the running video tape, and the first and second head chips 1a and 1b fixed to the rotating cylinder 1 slide with light pressure. Recording and reproduction of a predetermined information signal are performed while the device is in contact with the device. At this time, for example, the information detected by the second head chip 1b during playback,
The information signal recorded as a magnetic signal on the video tape is sent to the rotor 4a of the rotary transformer 4 via a lead wire (not shown).
Magnetic flux is generated through magnetic conversion by the second coil wound around the second groove. This magnetically converted magnetic flux is magnetically coupled with the second coil wound around the stator 4b, and is induced in the second coil as a signal current, and is processed by an appropriate processing circuit (not shown). Eventually, it will be displayed as an image on a home television or the like.

[0005]

[Problem to be solved by the invention] By the way, the above-mentioned VTR
One possible way to downsize the rotary head cylinder is to reduce the diameter of the rotating head cylinder. However, in that case, in a rotary magnetic head device with a conventional structure, the rotary transformer disposed inside the head cylinder must also be made smaller to match the smaller diameter of the cylinder, and therefore have a smaller capacity or fewer channels. do not have. Therefore, it is difficult to relay signal transmission paths of all channels related to a multi-head using such a rotary transformer with a small capacity or a small number of channels. In such a case, it will be necessary to secure some kind of signal transmission route in addition to the signal transmission route via the rotary transformer, but no effective and concrete proposal has yet been made to address this problem. . On the other hand, the applicant is also trying to materialize a plan to arrange the rotary transformer outside the rotating head cylinder, but in this case too, the signal transmission route between the head and the rotary transformer requires consideration. , effective concrete proposals are desired.

SUMMARY OF THE INVENTION An object of the present invention is to provide a rotary head type magnetic recording device in which a signal transmission path for a rotary magnetic head can be reliably set without being hindered by miniaturization of the device.

[0007]

[Means for Solving the Problems] In order to achieve the above object, the present invention includes a rotary head cylinder for relatively moving a tape-shaped magnetic recording medium along a predetermined portion of its circumferential surface;
A rotary magnetic head, the rotary magnetic head being disposed such that the locus of movement of its medium sliding surface substantially follows the circumferential surface of the rotary head cylinder, and recording or reproducing information signals while slidingly contacting the tape-shaped magnetic recording medium. The rotary head type magnetic recording and reproducing apparatus is characterized in that a signal transmission path to the rotary magnetic head is formed within a support shaft of the rotary head cylinder or head support member.

[0008]

[Operation] In the present invention, in a rotary head type magnetic recording/reproducing device, a signal transmission path to the rotary head is formed within the rotary head cylinder or the support shaft of the head support member, so that the device having a plurality of rotary heads etc., signals can be transmitted by using the transmission path within the spindle as at least part of the signal transmission path to the head. In this way, this type of device uses the inside of the spindle, which is an essential structural member, as a signal transmission path, so it is possible to reliably transmit signals to the rotating magnetic head without being hindered by the miniaturization of the device. You can set the route.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be explained in detail with reference to an illustrated embodiment. As shown in FIG. 1, a rotary magnetic head device 100, which is a main part of a rotary head type magnetic recording/reproducing device of the present invention, includes a rotary cylinder section 30 and a fixed cylinder section 50. The rotating cylinder section 30
is a rotating cylinder 31, a drive shaft 32, and a flange 3.
4, a pulley 37, etc. The drive shaft 32 is made of a hollow shaft, and a slightly thick disc-shaped flange 34 is press-fitted and fixed to the shaft 32 at the upper side thereof, and is in contact with the upper surface of the flange 34. A thick disc-shaped rotating cylinder 31 made of aluminum alloy or the like is fixed to the shaft 32 so as to be able to receive the shaft.

At the center of the lower surface of the cylinder 31, there is provided a depth approximately equal to the thickness of the flange 34 and the flange 34.
A circular cut hole 31a is formed with the shaft 32 at its center and has a diameter slightly larger than the diameter of the flange 34. Further, on the upper surface of the rotary cylinder 31, there is a circular cut hole 31b centered on the shaft 32, which has a diameter slightly larger than the diameter of the relay board 35 (see FIG. 2), which will be described next, and has a predetermined depth. It is provided.

A male threaded portion is carved into the upper end of the shaft 32, and a slightly larger tightening nut 33 is screwed into this male threaded portion, so that the flange 34 and this tightening nut 33 are screwed together. The rotary cylinder 31 is firmly fixed to the drive shaft 32. In the cut hole 31b of the cylinder 31, the relay board 35 made of a printed circuit board or the like as shown in FIG. 2 is fixed by appropriate means.

The relay board 35 is donut-shaped and has an outer diameter one size smaller than the cut hole 31b of the rotary cylinder 31, and an inner diameter one size larger than the maximum diameter of the tightening nut 33. There are four radial cut holes 35b, 35c, 35d, and 35e whose inner diameters are located at positions making an angle of 90 degrees from the center of the board 35.
are provided, and individual lead wires branched from a wire bundle 39, which will be described later, are inserted through these cut holes 35b to 35e. Further, the notch holes 35b to 3
5e, there are head chips 36a, 36b, 36c, and 36d, which will be described later, at two intermediate positions that are adjacent to each other.
A small hole 35f through which a driver is inserted to adjust the height of the
, 35g, 35h, and 35i are drilled. Furthermore, conductor patterns 35 are provided between the cut holes 35b to 35e and the small holes 35f to 35i on the upper surface of the substrate 35, respectively.
a, 35d are provided, and the end lead wire of the bundled wire 39 and the lead wire end of the head shown in broken line are soldered to this conductor pattern to relay and connect the two. .

As shown in FIG. 3, on the lower surface of the rotary cylinder 31, there are four head chips 36a located on diagonal lines at 90° to each other and located near the outer peripheral edge of the cylinder 31. , 36b, 36c, and 36d, and four head support plates 36e, 36f, and 36g fixing the head chips 36a to 36d, respectively.
, 36h are fixed with screws. Furthermore, four screws 42a, 42b, 42c, and 42d are provided at the center of each of the head support plates 36e to 36h to adjust the height of the head chips 36a to 36d. 42a to 42d are the aforementioned relay boards 3;
A driver is inserted through the four small holes 35f to 35i provided in the head chips 36a to 35i and rotated.
6d height can be adjusted. That is, the four small holes 35f to 35i provided in the relay board 35 and the adjustment screws 42a to 42d are in a positional relationship corresponding to each other. As in conventional devices of this type, each head chip 36
The medium sliding contact surfaces a to 36d are positioned so that their rotation loci follow the circumferential surface of the rotating cylinder 31.

Furthermore, as shown in FIG. 3, the rotary cylinder 31 has cut holes 35b to 35b provided in the relay board 35 on a diagonal line at an angle of 90° from its center.
Four through holes 31c, 31d, through which the branch lead wires of the wire bundle 39 are inserted, at positions corresponding to 35e, respectively.
31e and 31f are bored.

On the other hand, a circular pulley 37 is attached to the lower end of the shaft 32, as shown in FIG.
2 and is integrally attached. This pulley 37 is formed of a thick disk having a diameter larger than the diameter of the rotating cylinder 31, and has a relatively deep circular recess on its upper surface with a diameter slightly larger than the diameter of the rotating cylinder 31. 37a is formed. A thin donut-shaped rotor 38 of a rotary transformer is fixed in the recess 37a with an adhesive or the like.

The rotor 38 has four shielded coils arranged concentrically, and a wire bundle 39 that bundles lead wires pulled out from each coil.
is inserted through the hollow part of the shaft 32 to form a patterned conductor 35 corresponding to each lead wire of the relay board 35.
holes 31f, 31c, 31d, 3 connected to the rotary cylinder 31 from the relay board 35.
1e to insert the head chips 36a, 36b, 36.
c, 36d as appropriate. Incidentally, if the electrical connection between the head chip and the conductor in the shaft 32 is made using a sliding contactor or the like instead of using lead wires as described above, an electrical connection that does not depend on a rotary transformer can be obtained. , it is recommended to apply this aspect as appropriate. A pulley drive belt 41 is wound around the outer circumferential surface of the pulley 37 to transmit the rotational force of a drive motor (not shown).

[0017] Immediately below the flange 34,
A first rotary bearing 61 is press-fitted onto the shaft 32 at a predetermined interval, and a first rotary bearing 61 is located below the bearing 61 at a distance approximately the same length as the height of the fixed cylinder 51, which will be described below. Two rotary bearings 62 are press-fitted and fixed.

The fixed cylinder section 50 includes the fixed cylinder 51, a stator 52 of a rotary transformer, and various members not shown. Fixed cylinder 5 above
1 is an inner cylinder 51a formed of aluminum alloy or the like.
and an outer cylinder 51b having the same diameter as the rotary cylinder 31, and a flange 51c that is attached to a VTR main body (not shown) is formed on the outer periphery of the lower end of the outer cylinder 51b. The first and second bearings 61 and 62 are fixed to the upper and lower parts of the inner surface of the inner cylinder 51a, so that the drive shaft 32 is rotatably inserted into the fixed cylinder 51. Further, the upper end surface of the outer cylinder 51b is chamfered so that the inner side is lower. A videotape guide step portion 51d is formed on the outer circumferential surface of the outer cylinder 51b to allow the videotape to be wound around the rotary cylinder portion 30 and the fixed cylinder portion 50 at an angle.
This allows the videotape to slide while maintaining a predetermined inclination angle.

On the lower surface of the bottom wall of the fixed cylinder 51,
A stator 52 of the rotary transformer is fixed to the rotor 38 with an adhesive or the like. The stator 52 has four shielded coils arranged concentrically, and has four coils of the rotor 38.
The coils are paired with each other. This 4
Lead wires (not shown) are pulled out from each coil, and V
It is connected to an appropriate signal processing circuit of the TR main body.

In the rotating magnetic head device 100 configured as described above, when the drive motor (not shown) rotates, the rotating cylinder portion 30 also rotates, and the video camera (not shown) that is wound around the rotating magnetic head device 100 and runs. For example, when extracting a reproduction signal from a tape, the head chips 36a, 36b, 36c, 36d
detects a magnetic signal corresponding to a predetermined azimuth, and the wire bundle 3, which is a signal transmission path, is formed in the drive shaft 32, which is the support shaft of the head cylinder, via the relay board 35.
9 to respective corresponding coils on the rotor 38. In this way, the present invention utilizes the inside of the support shaft of the head cylinder, which is an essential structural member of this type of device, for the signal transmission path to the head, so miniaturization of the entire device is required to the utmost. Even when the head signal transmission route is set, the head signal transmission route can be easily and reliably set. Note that the signal transmission conductor is not limited to the above-mentioned bundled wire, but various forms such as printed wiring can be applied. Since each of the four coils provided on the stator 52 is electromagnetically coupled to the coil, the head side and the coil side provided on the stator 52 are connected through such signal coupling (transformer coupling). is,
Through a lead wire (not shown), the signal is processed by an appropriate reproduction circuit provided in the VTR body, and is finally sent out of the VTR as a standard format composite video signal.

[0021] In the above description, VTR is used as this type of device.
Although the present invention has been described in detail by taking as an example, it goes without saying that the present invention can also be applied to devices that handle audio signals and other data. Furthermore, in this embodiment, only a type of rotating magnetic head in which the head chip is fixed to a rotating cylinder and the head chip also rotates as the rotating cylinder rotates has been described, but the cylinder that guides the tape is a fixed cylinder. In a rotary head type magnetic recording/reproducing device, the head chips are attached to both ends of a head bar that is a support member for these head chips, and the head bar rotates relative to a fixed cylinder. Of course, the present invention can also be applied to such cases.

[0022]

According to the present invention, the inside of the spindle of the rotating head cylinder or head support member (head bar, etc.), which is an essential structural member in this type of device, is used as a signal transmission path to the head. Therefore, even if the miniaturization of the device is required to the utmost, the signal transmission route for the head can be easily and reliably set.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a rotating magnetic head device that is a main part of an embodiment of the present invention.

FIG. 2 is a plan view of a relay board of the rotating magnetic head device of FIG. 1;

FIG. 3 is a plan view of the rotating magnetic head device of FIG. 1 taken along line V-V.

FIG. 4 is a sectional view of a main part of a conventional rotary head type magnetic recording/reproducing device.

[Explanation of symbols]

1, 31 Rotating cylinders 1a, 1b, 36a, 36b, 36c, 36d
Head chip 2, 32 Shaft 3, 34 Flange 4a, 38 Rotor 4b, 52 Stator 7, 51 Fixed cylinder 39 Wire connection (bundled wire) 100
Rotating magnetic head device 35
Relay board

Claims (1)

[Claims] 1. A rotary head cylinder for relatively moving a tape-shaped magnetic recording medium along a predetermined portion of its circumferential surface;
A rotary magnetic head, the rotary magnetic head being disposed such that the locus of movement of its medium sliding surface substantially follows the circumferential surface of the rotary head cylinder, and recording or reproducing information signals while slidingly contacting the tape-shaped magnetic recording medium. A rotary head type magnetic recording and reproducing apparatus comprising: a rotary head type magnetic recording and reproducing apparatus, characterized in that a signal transmission path to the rotary magnetic head is formed within the spindle of the rotary head cylinder or head support member. Device.