JP4051548B2 - Rotating head drum device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rotary head drum device, and in particular, a rotary drum having a head and a fixed drum are arranged coaxially, and the head is brought into contact with a tape-shaped recording medium wound around the outer peripheral surface of the rotary drum and the fixed drum. The present invention relates to a recording / reproducing apparatus that performs recording and / or reproduction.
[0002]
[Prior art]
In a helical scan type magnetic recording / reproducing apparatus represented by a VTR, a rotating drum having a magnetic head and a fixed drum are arranged coaxially, and a magnetic tape is wound obliquely around the outer periphery of these drums at a predetermined speed. Run on. Then, by rotating the rotating drum at a high speed, the magnetic head is obliquely scanned on the magnetic tape, thereby achieving helical scan recording / reproduction.
[0003]
When a signal current is passed through a coil of a magnetic head provided on the rotating drum, strong or weak magnetic recording according to the signal current is performed on the magnetic tape by the principle of magnetic induction. Further, when the rotary head is scanned over a tape on which magnetic recording has been performed in advance, it becomes possible to take out a current corresponding to the recording signal on the coil of the magnetic head by the principle of electromagnetic induction.
[0004]
[Problems to be solved by the invention]
As described above, the helical scan type rotary head drum device performs predetermined recording and / or reproduction by contacting a magnetic tape running at a predetermined speed while rotating a magnetic head provided on the rotating drum. is there. Here, it is necessary to exchange a recording / reproducing signal between the rotating magnetic head and the recording / reproducing circuit on the fixed side. For this purpose, for example, a rotary transformer is provided. The rotary transformer is configured to transmit and receive signals between the rotating side and the fixed side via magnetic bonding by a rotor provided on the upper part of the rotating drum and a stator provided on the inner side of the cap disposed on the upper part of the rotating drum. Is to do.
[0005]
Wiring means made of a flexible substrate is connected to the stator side of the rotary transformer as described above, and signals are transmitted to and from a fixed circuit via the flexible substrate.
[0006]
In general, although a flexible substrate is flexible, it has a predetermined elastic modulus and rigidity. For this reason, when a flexible substrate drawn out from the upper part of the rotary head drum comes into contact with the chassis or the like, the reaction force is applied to the rotary head drum device. In particular, the inclination angle of the rotary head drum device is changed by being transmitted to the rotary drum, which may change the linearity of the track formed on the magnetic tape and cause a problem in compatibility. In particular, when the rotary head drum device is downsized and its weight is reduced, this tendency becomes remarkable. For this reason, there is a problem that the rotary head drum device from which the flexible substrate is drawn cannot be brought close to the wall surface of the chassis, and thus the rotary head drum device cannot be assembled on the chassis with high density. For this reason, miniaturization of a VTR incorporating a rotary head drum device is hindered.
[0007]
A tape guide is moved on the outer peripheral side of the rotary head drum device by a moving member, and the magnetic tape is loaded on the outer peripheral surface of the rotary head drum device by such a moving member. Here, when the VTR is downsized, the tape guide passes through a position very close to the outer peripheral surface of the rotary head drum. For example, when a large force is applied to the tape-shaped recording medium, the tape guide is deformed and Problems such as contact with the outer peripheral surface may occur.
[0008]
The present invention has been made in view of such problems, and avoids the problem of changes in track linearity caused by a wiring means such as a drawn flexible board hitting a member such as a wall surface of a chassis. Another object of the present invention is to provide a rotary head drum device that more reliably prevents interference of the tape guide with the rotary drum during loading of the tape-shaped recording medium.
[0009]
[Means for Solving the Problems]
The main invention of this application is:
A rotating drum having a head and a fixed drum are coaxially arranged, and recording and / or reproduction is performed by bringing the head into contact with a tape-shaped recording medium wound around the outer periphery of the rotating drum and the fixed drum. In the recording / reproducing apparatus as described above,
A cap is provided on the rotating drum so as to be located on the opposite side of the rotating drum in the axial direction with respect to the rotating drum, and on the outer peripheral side of the cap from the outer peripheral surfaces of the rotating drum and the fixed drum Also , a guide having a presser is provided on the outer peripheral side , and the wiring means drawn from the inside of the cap is pressed against the guide by the presser to guide the outer peripheral side of the rotating drum and the fixed drum substantially parallel to the axial direction. The present invention relates to a rotary head drum device.
[0010]
Here, the cap may be formed of a synthetic resin molded body, and the guide and the presser may be integrally connected. Preferably, the wiring means is a signal flexible board for transmitting a recording signal or a reproduction signal, and is connected to a stator of a rotary transformer arranged inside the cap. The rotating drum is disposed above the fixed drum, the cap is disposed above the rotating drum, and the wiring means drawn from the inside of the cap is connected to the rotating drum and the fixed by the guide and the presser. It is preferable to guide the drum so as to extend downward in the axial direction on the outer peripheral surface of the drum. Further, it is preferable that the wiring means is guided along the inner surface of the chassis on the back side by the guide and the presser.
[0011]
[0012]
Further, here, a protrusion projecting outward from the outer peripheral surface of the rotating drum may be provided on the outer peripheral side of the cap. The cap may be formed of a synthetic resin molded body, and the protrusions may be integrally provided. Further, it is preferable that the protrusion is formed facing a moving path of a tape guide for loading the tape-shaped recording medium, and the tape guide is prevented from coming into contact with the rotating drum.
[0013]
In a preferred embodiment of the invention included in the present application, in a rotary head drum device having a rotary drum having a head and a fixed drum, a flexible substrate for signals is guided to a cap made of synthetic resin attached to an upper portion of the rotary drum. In addition to providing a guide and a presser arm that presses the flexible board against the guide, thereby restricting the drawing position of the flexible board, the signal flexible board can interfere with the wall surface of the chassis. It is intended to prevent. According to such a configuration, the signal flexible board drawn out from the inside of the cap abuts against the wall surface of the chassis, and the reaction angle changes the inclination angle of the rotary head drum device, so that the head is above the tape-shaped recording medium. Therefore, it is possible to prevent the problem of compatibility by changing the linearity of the track formed in the first place, and it is possible to dispose the rotary head drum device very close to the wall surface of the chassis.
[0014]
In another preferred embodiment of the present application, in a rotary head drum device comprising a rotary drum having a head and a fixed drum, a cap made of synthetic resin is provided on an upper portion of the rotary drum, and the rotary drum is provided on the outer periphery of the cap. Protrusions that protrude outward from the outer periphery of the tape are provided so that the tape guide does not come into contact with the rotating drum or head even when the tape guide moves to the outer peripheral surface of the rotating head drum device during tape loading. Is. As a result, the tape loading device of the VTR can be disposed close to the rotary head drum device, and a more compact VTR is provided.
DETAILED DESCRIPTION OF THE INVENTION
The present invention will be described below with reference to the illustrated embodiments. FIG. 1 and FIG. 2 show the schematic configuration of the entire rotary head drum device for a VTR according to the present embodiment, and this rotary head drum device has a fixed drum 25 and a rotary drum as shown in FIG. 26 in combination. A support shaft 27 is disposed so as to pass through these drums 25 and 26, and a lower end side portion of the support shaft 27 is press-fitted and fixed in an insertion hole 28 formed in the center portion of the fixed drum 25. The rotating drum 26 is rotatably supported by the support shaft 27 via a pair of upper and lower ball bearings 29 and 30. A preload spring 31 is interposed between the ball bearings 29 and 30, and thereby the outer rings of the pair of ball bearings 29 and 30 are urged away from each other.
[0016]
A cap 33 is disposed on the rotating drum 26. That is, the mounting boss 34 is fixed to the upper end portion of the support shaft 27 protruding above the rotating drum 26, and the cap 33 is supported by the mounting boss 34. A rotary transformer 35 is disposed inside the cap 33. The rotary transformer 35 includes a stator 36 and a rotor 37, and the stator 36 is attached and held on the lower surface of the cap 33. On the other hand, the rotor 37 is supported on the upper portion of the rotating drum 26. And is connected to the signal flexible board 38 to the stator 36 of the rotary transformer 35, together with the signal flexible board 38 is pulled out to the outside of the cap 33, with respect to the guide 68 as shown in FIG. 3 by the holding arm 39 It is being held down.
[0017]
As shown in FIGS. 2 and 3, a magnetic head 42 is attached to the outer periphery of the rotating drum 26 at the lower end side. The magnetic head 42 is supported at the tip of the head base 43 and is fixed to the lower surface of the rotary drum 26 by a fixing screw 44. The head base 43 is provided with a connecting projection 45, which is connected to a contact spring 46 in the rotary drum 26, and the upper end side of the contact spring 46 is a coil of the rotor 37 of the rotary transformer 35. It is connected to the.
[0018]
Next, the structure of the motor 50 that is incorporated in the fixed drum 25 and rotationally drives the rotary drum 26 will be described with reference to FIG. The motor 50 includes a rotor magnet 51 and a stator 52 made of a printed circuit board. The rotor magnet 51 is supported on the lower surface of the rotating drum 26 via a magnet case 53. Further, small compartments 54 are formed along the circumferential direction on the outer peripheral side of the magnet case 53, and a balance weight 55 made of steel balls is appropriately inserted into these compartments 54 for balance adjustment. Further, a back yoke 56 is attached to the rotating drum 26, and the back yoke 56 rotates on the lower surface of the stator 52, and forms a magnetic path by a magnetic field generated by the magnet 51.
[0019]
On the other hand, the stator 52 of the motor 50 is formed by forming a coil along the circumferential direction, and a power supply flexible substrate 59 is joined to the lower surface of the stator 52 including such a coil. A lead-out portion 60 is formed in part of the circumferential direction of the power supply flexible substrate 59 (see FIG. 3). A conductive pattern 61 is formed on the power supply flexible substrate 59, and power is supplied by such a conductor pattern 61 so that the coil formed on the upper surface of the stator 52 made of a printed circuit board is energized. As shown in FIG. 3, the power supply flexible substrate 59 is pulled out through an opening 64 formed in the outer peripheral wall of the fixed drum 25, and is thereby connected to the power circuit on the fixed side.
[0020]
As described above, the rotary head drum device of the present embodiment has the rotary drum 26, and the rotary drum 26 is assembled on the support shaft 27 by the pair of ball bearings 29, 30 having the support shaft 27 also serving as the inner ring. It has been. The recording / reproducing magnetic head 42 is attached to the head base 43 and attached to the lower surface of the rotary drum 25 by a fixing screw 44. The magnet case 53 and the magnet 51 of the motor 50 that drives the rotary drum 26 are fastened to the rotary drum 26 by screws. The base end portion of the support shaft 27 is press-fitted into the insertion hole 28 of the fixed drum 25, and the back yoke 56 faces the magnet 51 with the stator 52 of the motor 50 interposed therebetween. The stator 52 is attached to the seating surface of the fixed drum 25 by bonding.
[0021]
In the configuration as described above, when the coil of the stator 52 is energized from the power circuit on the fixed side (not shown) through the flexible substrate 59 for feeding, the current flowing through the coil is linked to the magnetic flux generated by the magnet 51. As a result, the magnet 51 receives a rotational force. Accordingly, the rotary drum 26 is rotationally driven by the ball bearings 29 and 30 of the support shaft 27.
[0022]
When the magnetic tape is wound obliquely around the outer periphery of the fixed drum 25 and the rotating drum 26 and the magnetic tape is run at a constant speed by a capstan and a pinch roller (not shown), the magnetic tape is rotated as described above. As the drum 26 rotates, it comes into sliding contact with the magnetic head 42 to perform so-called helical scan recording and / or reproduction.
[0023]
Next, a mechanical configuration of a VTR including such a rotary head drum device 80 will be described with reference to FIG. On the mechanical chassis, a rotary head drum device 80, a supply reel 81, and a take-up reel 82 are arranged so as to correspond to the three apexes of an equilateral triangle. A moving member 83 is disposed on the left side of the rotary head drum device 80, and an inclined pin 84 and a tape guide 85 are mounted on the moving member 83. Similarly, a moving member 87 is movably disposed on the right side of the rotary head drum device 80, and an inclined pin 88 and a tape guide 89 are mounted on the moving member 87.
[0024]
An opening / closing lever 91 is disposed on the left side of the rotary head drum device 80, and a tape guide pin 92 is implanted in the opening / closing lever 91. On the other hand, a capstan 93 and a pinch roller 94 are arranged at a position opposite to the opening / closing lever 90 with respect to the rotary head drum device 80. A loading motor 96 is disposed on the left side of the rotary head drum unit 80, and the left and right moving members 83 and 87 are moved by the output of the loading motor 96. A tape end detection sensor 97 is fixedly arranged on the front side of the rotary head drum device 80. A chassis wall 98 is disposed on the back side of the rotary head drum device 80.
[0025]
In such a configuration, when the tape cassette is mounted on the upper part of the pair of left and right feeding reels 81 and take-up reel 82, the left and right moving members 83 and 87 are moved by the loading motor 96 , whereby the magnetic tape in the tape cassette is moved. It is pulled out and wound on the outer peripheral surfaces of the fixed drum 25 and the rotary drum 26 of the rotary head drum device 80. Then, since the pinch roller 94 presses the magnetic tape against the capstan 93, the magnetic tape travels at the same speed as the surface speed of the capstan 93. Accordingly, when the rotary drum 26 of the rotary head drum device 80 is driven to rotate, the magnetic head 42 provided on the rotary drum 26 is brought into contact with the magnetic tape, and helical scan recording / reproduction is achieved.
[0026]
In such a rotary head drum device 80 of the VTR, a signal flexible substrate 38 for transmitting a recording / reproducing signal between the coil of the magnetic head 42 and an external recording / reproducing circuit is provided above the rotating drum 26. The cap 33 is held by the guide 68 and the presser arm 39 of the cap 33. That is, the cap 33 is a synthetic resin injection-molded part. As shown in FIG. 3, the cap 33 is provided with a guide 68 on a part of its outer peripheral side so as to protrude radially outward. In addition, a presser arm 39 is continuously provided on the outer side of the guide 68. The drawer portion 67 of the flexible substrate 38 is inserted and pressed in the slit portion between the guide 68 and the presser arm 39.
[0027]
The distal end portion of the signal flexible substrate 38 is joined to the upper surface of the stator 36 of the rotary transformer 35 and connected to the coil of the stator 36. The drawer portion 67 of the signal flexible board 38 is pulled out to the outer peripheral side at the upper part of the rotary drum 26 and is pressed by the guide 68 and the presser arm 39 along the outer peripheral surfaces of the rotary drum 26 and the fixed drum 25. As shown in FIG. 3, it is guided downward.
[0028]
Therefore, when the above-described configuration is applied to a VTR as shown in FIG. 5, the signal flexible board 38 drawn out from the rotary transformer 35 on the upper side of the rotary drum 26 is pressed against the guide 68 by the presser arm 39. Since the rotary drum 26 and the fixed drum 25 are pressed downward along the outer surface, the drawer portion 67 of the signal flexible board 38 is largely drawn to the outer peripheral side of the rotary head drum device 80, and such a signal flexible board is provided. The 38 drawer portions 67 are prevented from contacting the chassis wall 98.
[0029]
Therefore, the signal flexible board 38 abuts against the chassis wall 98 and the reaction force prevents the rotary head drum device 80 from receiving a side pressure. For this reason, the track straight line formed on the magnetic tape 71 by the magnetic head 42 is prevented. The change in gender disappears and compatibility issues can be resolved. Further, since the guide 68 and the presser arm 39 for pressing the lead portion 67 of the signal flexible board 38 as described above are provided, the rotary head drum device 80 can be disposed very close to the chassis wall 98. As a result, the degree of freedom of arrangement on the chassis is increased or a high-density arrangement is possible. Therefore, this makes it possible to reduce the size of the magnetic recording / reproducing apparatus having the rotary head drum device 80.
[0030]
Further, the cap 33 of the rotary head drum device is provided with a protrusion 69 on the outer peripheral side thereof. As shown in FIGS. 3 to 5, the protrusion 69 is arranged facing the moving path of the tape guide 89 moved by the moving member 87. Therefore, even if the tape guide 89 receives a lateral pressure or a force is applied via the magnetic tape 71, the upper end of the tape guide 89 comes into contact with the protrusion 69, so that the tape guide 89 No contact with the magnetic head 42 occurs. Therefore, from this, the rotating drum 26 and the magnetic head 42 can be reliably protected. In addition, this makes it possible to provide a moving path for the moving member 87 having the tape guide 89 in the vicinity of the outer peripheral surface of the rotary head drum device 80, thereby further reducing the size of the VTR.
[0031]
As shown in FIG. 1, the cap 33 having the protrusion 69 has an opening 70 in the upper part, and the opening 70 emits sound accompanying vibration generated inside. That is, the structure is such that no sound is trapped inside the rotary head drum device, thereby reducing vibration and suppressing temperature rise.
[0032]
Although the invention included in the present application has been described with the illustrated embodiment, the present invention is not limited to the above-described embodiment, and various modifications can be made within the scope of the technical idea of the invention included in the present application. is there. For example, in the above-described embodiment, the cap 33 attached to the upper portion of the rotating drum 26 via the mounting boss 34 is formed of a synthetic resin injection-molded body, but the cap 33 is not necessarily formed of a synthetic resin injection-molded body. For example, it may be made of a metal such as an aluminum alloy. The cap 33 may have a guide surface for the magnetic tape 71 or may be a cap that does not contact the magnetic tape 71. Various changes can be made to the shape of the cap 33.
[0033]
【The invention's effect】
In the main invention of the present application, a rotary drum having a head and a fixed drum are arranged coaxially, and the head is brought into contact with a tape-shaped recording medium wound around the outer periphery of the rotary drum and the fixed drum. Alternatively, in a recording / reproducing apparatus adapted to perform reproduction, a cap is provided on the rotating drum so as to be positioned on the opposite side of the fixed drum in the axial direction with respect to the rotating drum, and the outer peripheral side of the cap is the rotating drum. A guide having a presser is provided on the outer peripheral side of the outer peripheral surface of the fixed drum, and the wiring means drawn from the inside of the cap is pressed against the guide by the presser so that the outer peripheral side of the rotating drum and the fixed drum is substantially parallel to the axial direction. it is those you so that you guide.
[0034]
Therefore, according to such a rotary head device, the wiring means drawn out from the rotating drum comes to be pressed against the guide by the presser, thereby preventing the drawn out wiring means from protruding greatly to the side, It becomes possible to correctly arrange at a desired position, and unnecessary interference with other members is prevented.
[0035]
[0036]
Further , according to the configuration in which the protrusion that protrudes to the outer peripheral side from the outer peripheral surface of the rotating drum is provided on the outer peripheral portion of the cap, the other members are rotated by the protrusion that protrudes to the outer peripheral side of the outer peripheral surface of the rotating drum. Interference with the drum or the head provided on the rotating drum can be prevented. In particular, according to the structure in which the protrusion is formed facing the moving path of the tape guide for loading the tape-shaped recording medium and prevents the tape guide from contacting the rotating drum, the tape guide is connected to the rotating drum and the head. Interference can be surely prevented.
[Brief description of the drawings]
FIG. 1 is a plan view of a rotary head drum device.
FIG. 2 is a longitudinal sectional view of a main part of the rotary head drum device.
FIG. 3 is a perspective view of a main part of the rotary head drum device.
FIG. 4 is a front view of the rotary head drum device.
FIG. 5 is a perspective view of a main part of a chassis of a VTR in which the rotary head drum device is mounted.
[Explanation of symbols]
25 ... Fixed drum, 26 ... Rotating drum, 27 ... Support shaft, 28 ... Insertion hole, 29, 30 ... Ball bearing, 31 ... Preload spring, 33 ... Cap, 34 ... Mounting boss, 35 ... Rotary transformer, 36 ... Stator, 37 ... Rotor, 38 ... Flexible substrate for signals, 39 ... Presser arm, 42 ... Magnetic head, 43 ... Head base, 44 ... Fixing screw, 45 ... Projection for connection, 46 ... Contact spring, 50 ... Motor, 51 ... Magnet (rotor), 52 ... Stator (printed circuit board), 53 ... Magnet case, 54 ... Compartment, 55 ... Balance Weight (steel ball), 56 ··· Back yoke, 58 ··· Coil, 59 ··· Flexible substrate for power feeding, 60 ··· Lead-out portion, ··· 61 · Conductor pattern · 62 · · · Seat surface, 64 Opening, 67 ... Drawer, 68 ... Guide, 69 ... Projection, 70 ... Opening, 71 ... Magnetic tape, 80 ... Rotary head drum unit, 81 ... Feeding reel, 82 ... Winding Reel, 83 ... Moving member, 84 ... Inclined pin, 85 ... Tape guide, 87 ... Moving member, 88 ... Inclined pin, 89 ... Tape guide, 91 ... Open / close lever, 92 ... Tape guide bin , 93 Capstan, 94 Pinch roller, 96 Loading motor, 97 Tape end detection sensor, 98 Chassis wall

Claims (8)

A rotating drum having a head and a fixed drum are coaxially arranged, and recording and / or reproduction is performed by bringing the head into contact with a tape-shaped recording medium wound around the outer periphery of the rotating drum and the fixed drum. In the recording / reproducing apparatus as described above,
A cap is provided on the rotating drum so as to be located on the opposite side of the rotating drum in the axial direction with respect to the rotating drum, and on the outer peripheral side of the cap from the outer peripheral surfaces of the rotating drum and the fixed drum Also , a guide having a presser is provided on the outer peripheral side , and the wiring means drawn from the inside of the cap is pressed against the guide by the presser to guide the outer peripheral side of the rotating drum and the fixed drum substantially parallel to the axial direction. A rotary head drum device.   The rotary head drum device according to claim 1, wherein the cap is made of a synthetic resin molded body, and the guide and the presser are integrally connected.   2. The rotary head drum according to claim 1, wherein the wiring means is a signal flexible board for transmitting a recording signal or a reproduction signal, and is connected to a stator of a rotary transformer disposed inside the cap. apparatus. The rotating drum is arranged on the upper part of the fixed drum, the cap is arranged on the upper part of the rotating drum, and the wiring means drawn out from the inside of the cap is connected to the rotating drum and the fixed drum by the guide and the presser. The rotary head drum device according to claim 1, wherein the rotary head drum device is guided so as to extend downward in the axial direction on the outer peripheral surface of the rotary head drum.   2. The rotary head drum device according to claim 1, wherein the wiring means is guided along the inner surface of the chassis on the rear side by the guide and the presser. The rotary head drum device according to claim 1 , wherein a protrusion that protrudes more outward than the outer peripheral surface of the rotary drum is provided on the outer peripheral side of the cap.   The rotary head drum device according to claim 6, wherein the cap is formed of a synthetic resin molded body, and the protrusions are integrally provided.   The rotary head according to claim 6, wherein the protrusion is formed facing a moving path of a tape guide for loading the tape-shaped recording medium, and prevents the tape guide from contacting the rotary drum. Drum equipment.

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