JP3033296B2 - Magnetic recording / reproducing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention mainly relates to a magnetic recording / reproducing apparatus (hereinafter referred to as VT) for recording (or reproducing) video signals on a magnetic tape.
Called R. ).

[0002]

2. Description of the Related Art In recent years, VTRs have become smaller and have higher recording density, and a VTR having a configuration in which a magnetic tape is wound around a fixed drum to rotate a rotary head at a high speed to record a high-frequency signal has been provided. Hereinafter, a conventional example will be described with reference to the drawings.

FIG. 4 is a sectional view of a conventional rotary head device of a VTR, and 1 is a rotary head, which can reproduce a recording signal from a magnetic tape (not shown). Reference numeral 2 denotes a head base to which the rotary head 1 is bonded and fixed to the tip, and which is fixed to the lower end of the annular rotary drum 15 with screws 3. Reference numeral 4 denotes an annular fixed upper drum on which a magnetic tape is wound around an outer peripheral surface 4a. Numeral 5 denotes an annular fixed lower drum provided with leads 5a for helically regulating the running height position of the magnetic tape wound on the outer peripheral surface. Reference numeral 6 denotes a rotating disk, which is fixed to a rotating shaft 7 at the center and is rotatably supported by bearings 8, 8 '. 9 is a thrust stopper fixed to the lower end of the rotating shaft 7 with a screw 10, and 11 is a screw 1 attached to the thrust stopper 9.
The rotor of the electric motor is fixed by 2, 13 is a magnet adhered and fixed to the rotor 11 of the electric motor, 14 is a stator coil of the electric motor. Reference numeral 16 denotes a screw for fastening the rotary drum 15 to the rotary disk 6, and 17 denotes a primary core of a rotary transformer adhered and fixed to a lower portion of the rotary disk 6, which is 180 ° apart from the rotary head 1 and the rotary head 1. A primary winding for transmitting a recording (or reproduction) signal to each of the rotating heads 1 '(not shown) provided in the groove is provided in the groove. Reference numeral 18 denotes a secondary core of the rotary transformer, which is fixed to the inside of the fixed lower drum 5 so as to face the primary core 17 of the rotary transformer, and a secondary winding is provided in the groove. Reference numeral 19 denotes a slip ring mounting tool fixed to the upper end of the rotating disk 6 by screws 21 via a spacer 20, and 22 denotes slip ring electrodes 23, 24, and 2.
A slip ring holder for insulatingly holding 3e and 24e,
It is adhesively fixed to the slip ring attachment 19.
25, 26, 25e and 26e are the slip ring electrodes 2
The brushes 27 corresponding to the brushes 3, 24, 23e and 24e are insulated from the brushes 25, 26, 25e and 26e. 29 is a circuit board fixed to the upper part of the rotary drum 15, 31 is a preamplifier formed on the circuit board 29, and amplifies the reproduction signals from the rotary heads 1 and 1 'individually to form a rotary transformer. Primary core 1
7 primary winding. Reference numeral 42 denotes a fixed drum connecting member, and the outer peripheral surface of the fixed upper drum 4 and the outer peripheral surface of the fixed lower drum 5 are fastened and fixed by screws 43 and 43 '. FIG. 5 is a plan view of a main part of a conventional VTR.

A magnetic tape 32 has tape guides 33,
Erase head 34, tape guide 35, rotary head 1,
1 'is built-in, and includes a rotary head device, a tape guide 36, an audio control head 37, and a capstan 38 in which the outer peripheral surface of the fixed upper drum 4 and the outer peripheral surface of the fixed lower drum 5 are fixed by a fixed drum connecting member 42. Each is guided to form a tape running path. Reference numeral 39 denotes a pinch roller.

Next, the operation of the conventional example shown in FIGS.
Is set to the recording mode, the motor stator coils 14 are energized, and a rotational force is generated in the rotor 13.
Thrust stopper 9, rotating shaft 7, rotating disk 6, primary core 17 of rotating transformer, rotating drum 1 fixed to
5, the portions fixed to the rotating shaft, such as the rotary heads 1 and 1 ', rotate in the direction of arrow 40. Subsequently, the capstan 38 is rotated, and the pinch roller 39 is pressed with the magnetic tape 32 interposed therebetween.
9, the magnetic tape 32 starts running in the direction of arrow 41.

When a recording signal is applied to the rotary heads 1 and 1 'through the rotary transformer, a new magnetization track is formed on the magnetic tape. When the VTR enters the reproduction mode, + Vcc and GND power are supplied to the preamplifier 31 through the brushes 25 and 26 that are in contact with the electrodes 23 and 24 of the slip ring.
, The reproduced signals from the rotary heads 1 and 1 ′ are individually amplified and applied to the primary winding of the primary core 17 of the rotary transformer, and the secondary winding of the secondary core 18 corresponding to this is amplified. Output to the line and applied to the subsequent signal processing circuit.

[0007]

In the conventional VTR described above, the fixed drum connecting member 4 of the rotary head device is used.
5, the outer peripheral surface of the fixed upper drum 4 and the outer peripheral surface of the fixed lower drum 5 other than the region where the magnetic tape 32 is wound around the rotary head device are generally fixed. In recent VTRs, for example, a rotating head device and a tape guide are arranged close to each other to shorten a wound magnetic tape traveling path, and to reduce vibration of the magnetic tape caused by contact and separation between the rotating head and the magnetic tape. Thus, there is a tendency to reduce the reproduction signal jitter and downsize the VTR. Therefore, when the rotary head device and the tape guide are arranged close to each other in the above-described conventional VTR, the area of the fixed drum connecting member 42 of the rotary head device is reduced, and the mechanical structure of the fixed drum connecting member 42 is reduced. The magnetic tape wound around the rotary head device because it is difficult to maintain the mechanical position accuracy of the magnetic tape winding outer peripheral surface of the fixed upper drum with respect to the magnetic tape winding outer peripheral surface of the fixed lower drum because the mechanical strength decreases. In this case, there is a problem that the reproduction output of the rotary head is reduced and the compatibility of the VTR is deteriorated.

As a means for solving this problem, conventionally, a measure for increasing the thickness of the fixed drum connecting member 42 and maintaining the mechanical strength is generally used.

However, if the thickness of the fixed drum connecting member 42 is increased, it becomes difficult to arrange the tape guide and the audio control head close to the rotary head device, and the magnetic tape traveling path from the rotary head device increases. As a result, new problems such as preventing the VTR from being downsized have arisen.

SUMMARY OF THE INVENTION The present invention has been made to solve the conventional problems and does not increase the thickness of a fixed drum connecting member included in a rotary head device. An object of the present invention is to provide a miniaturized VTR that can maintain a mechanical position accuracy of a winding outer peripheral surface and obtain a highly reliable reproduction signal.

[0011]

Means for Solving the Problems An annular upper drum for winding a magnetic tape around an outer peripheral surface, and an annular upper drum positioned below the annular upper drum,
A first annular lower drum having leads for regulating the running height position of the magnetic tape wound around the outer peripheral surface in a helical manner, and an annular lower drum fixing surface for fixing the outer peripheral surface of the annular lower drum; An annular upper drum fixing surface for fixing the outer peripheral surface of the annular upper drum at a position deviated in a direction in which the magnetic tape wound around the annular upper drum decreases relative to the drum fixing portion and the first drum fixing portion is formed. A drum connecting member having a second drum fixing portion, a rotating head provided between the annular upper drum and the annular lower drum, and a second drum fixing portion of the drum connecting member and an outer peripheral surface of the annular lower drum. And a tape guide that winds a magnetic tape spaced apart from the outer peripheral surface of the annular upper drum.

[0012]

According to the present invention, the contact area of the fixed surface of the annular lower drum formed on the first drum fixing portion of the drum connecting member and the annular shape formed on the second drum fixing portion are constituted by the above construction. By making the contact area of the fixed surface of the upper drum substantially the same as that of the outer peripheral surface of the magnetic tape winding of the annular lower drum, it acts to maintain the mechanical positional accuracy of the outer peripheral surface of the magnetic tape winding of the annular upper drum and the drum connection. A magnetic tape wound around a tape guide partially disposed in a space formed by a second drum fixing portion of the member and the outer peripheral surface of the annular lower drum, and separated from the outer peripheral surface of the annular upper drum Acts to shorten the travel path.

[0013]

FIG. 1 shows an embodiment of a VTR according to the present invention.
It is described together with FIG. Parts that are not relevant to the present invention have the same reference numerals and symbols as those in the conventional example shown in FIGS.

FIG. 1 is a plan view of a main part of a VTR according to one embodiment of the present invention, and FIG. 2 is a VTR of one embodiment according to the present invention.
FIG. 3 is a sectional view of a rotary head device incorporated therein, and FIG. 3 is a side development view of a drum connecting member included in a rotary head device of a VTR according to an embodiment of the present invention. 43, 43 '
Denotes a recording head, and 44 and 44 'denote reproducing heads, which are fixed to the lower end of an annular rotary drum 45 by screws 3. 4
Numeral 6 denotes a fixed upper drum formed in an annular shape, and a magnetic tape is wound around an outer peripheral surface 46a. Reference numeral 47 denotes an annular lower fixed drum provided with leads 47a for helically regulating the traveling height position of the magnetic tape wound on the outer peripheral surface 47b. Reference numeral 48 denotes a circuit board fixed to the upper portion of the rotary drum 45 by screws 48 ', and a preamplifier 31 provided on the circuit board 48 amplifies a reproduction signal from the reproduction head 44. 49 is a fixed core of a cylindrical rotary transformer bonded and fixed inside the fixed lower drum 47, 50 is a rotary core of a cylindrical rotary transformer bonded and fixed to the rotary disk 6, and 51 and 52 are fixed cores of a cylindrical rotary transformer. 49
The reference numerals 53 and 54 denote the winding grooves of the signal transmission coil formed on the rotary core 50 of the cylindrical rotary transformer, respectively.

Reference numeral 55 denotes a thrust stopper fastened to the lower end of the rotary shaft 7 with screws 10, 56 denotes a motor rotor fixed to the thrust stopper 56 with screws 12,
57 is a frequency generating annular magnet adhesively fixed to the outer periphery of the end of the rotor 56; 58 is a main magnet adhesively fixed to the inside of the rotor 56; 59 is an electric motor fixed to the end of the fixed lower drum 47 with screws 60; A stator core is wound around the stator core. Reference numeral 61 denotes a wiring board of the electric motor fixed to the spacer 62. On the outer peripheral side, a frequency generating pattern coil that opposes the frequency generating annular magnet 57 and converts a change in the rotating magnetic flux of the frequency generating annular magnet 57 into an electric signal is provided. It is configured. 63 is a wiring board 61 of the motor facing the end of the main magnet 58.
Shows the main magnet rotation phase detector fixed to
The magnetic flux change due to the rotation of the main magnet 58 is converted into an electric signal, and the energization of the stator coil wound around the stator core 59 of the electric motor is sequentially switched to generate a rotational force on the rotor 56.

Reference numeral 64 denotes a fixed drum connecting member. The first drum fixing portion 64a 'on which the first drum fixing surface 64a for fixing the outer peripheral surface 47b of the fixed lower drum 47 is formed, and the first drum fixing surface 64a. In contrast, as shown in FIG. 3, the outer peripheral surface 46a of the fixed upper drum 46 is fixed at a position deviated in the direction in which the ratio of the magnetic tape 32 wound on the outer peripheral surface 46a of the fixed upper drum 46 decreases. Drum fixing surface 6
And a second drum fixing portion 64b 'on which the outer drum 4b is formed. The second drum fixing portion 64b' is fixed to the outer peripheral surface 47b of the fixed lower drum 47 with screws 65, and the outer peripheral surface 46a of the fixed upper drum 46 is fixed with screws 65 '. I have. Reference numeral 66 denotes a fixed upper drum reinforcing member which is fastened and fixed to the fixed drum connecting member 64 and the fixed upper drum 46 by screws 67 and 68, and the recording head 4
In replacing the rotating drum 45 and checking the operation of the preamplifier 31 due to wear of the 3, 43 'and the reproducing heads 44, 44', the screws 65 ', 67 are removed, and the fixed upper drum 46 and the reinforcing member 66 are unitized. Work.
The fixed part contact area of the outer peripheral surface 47b of the fixed lower drum 47 with the first drum fixing surface 64a of the drum connecting member 64 and the fixed part contact area of the outer peripheral surface 46a of the fixed upper drum 46 with the second drum fixing surface 64b are as follows. Made almost identical,
It is configured to maintain the mechanical positional accuracy of the outer peripheral surface 46a of the fixed upper drum 46 with respect to the outer peripheral surface 47b of the fixed lower drum 47. Reference numeral 69 denotes a cylindrical rotary head cleaner which contacts the recording heads 43 and 43 'and the reproducing heads 44 and 44' to remove the deposits. The rotary head cleaner 69 includes the recording heads 43 and 43 ′ and the reproducing head 4.
4, 44 ′ is the second of the fixed drum connecting members 64.
Of the tape running path divided by the rotary head device after passing through the drum fixing surface 64b of the magnetic tape 32 from the side where the winding of the magnetic tape 32 around the outer peripheral surface 46a of the fixed upper drum 46 is increased. A part of the rotary head cleaner 69 is disposed close to the outer periphery of the rotary head device in a section where the contact with the magnetic tape 32 of the tape running path starts, and a part of the rotary head cleaner 69 is located above the first drum fixing surface 64 a of the fixed drum connecting member 64. The outer peripheral surface 47b of the fixed lower drum 47 and the outer peripheral surface 46a of the fixed upper drum 46 are opposed to each other. And
The rotating head cleaner 69 is sucked to the outer peripheral surface side of the rotating head device by a suction operation by energizing the solenoid 70, and the recording heads 43 and 43 'and the reproducing heads 44 and 44' pass therethrough.
In contact with each other. Reference numeral 71 denotes a rotary plate of the rotary head cleaner 69. When the cutout portion 72 is sucked by the suction pin of the solenoid 70, the rotary head cleaner 69 turns around the rotary shaft 73 and the rotary head cleaner 69 is indicated by a broken line 69 '. Move to the position shown. Reference numeral 74 denotes a stopper pin of the rotating plate 71, and reference numeral 75 denotes a coil spring wound around the rotating shaft 73. 76 denotes a cover of the rotary head cleaner disposed around the rotary head cleaner 69, and 77 denotes a cleaner support shaft for rotatably supporting the rotary head cleaner 69.

Reference numeral 78 denotes an outer peripheral surface 47b of the annular lower drum 47 formed by the second drum fixing portion 64b 'of the drum connecting member 64 and an outer peripheral surface 47b of the annular lower drum 47, as shown in FIGS. A second tape guide that is partially disposed in the outer space area and divides a magnetic tape path from the first tape guide 36 ′ to the annular upper drum 46; a magnetic tape separated from an outer peripheral surface 46a of the annular upper drum 46; 32 is the second
And the first tape guide 3
At 6 ', the travel height position is regulated. 79 denotes a tape guide which forms a tape running path from the capstan 38.

Next, the operation of the VTR in this embodiment will be described with reference to FIGS. In the process of winding the magnetic tape 32 around the rotating head device, the energization of the stator coil wound around the stator core 59 of the electric motor is sequentially switched to generate a rotating force on the rotor 56 and rotate the rotating drum 45 for recording. Heads 43, 43 'and reproducing heads 44, 4
4 'is rotated in the direction of arrow 40, and the magnetic tape 32 is wound around the tape guide 33, the erasing head 34, the tape guide 35, the rotating head device, the tape guides 78 and 36', the audio control head 37, and the capstan 38, respectively. When the formation of the tape running path is completed, the capstan 38 is rotated, the pinch roller 39 is pressed with the magnetic tape 32 interposed therebetween, and the magnetic tape 32 is cooperated by the capstan 38 and the pinch roller 39. The vehicle starts traveling in the direction of arrow 41.

When a recording signal is applied to the recording heads 43 and 43 'through signal transmission coils wound around the fixed core 49 of the cylindrical rotary transformer and the rotary core 50 of the cylindrical rotary transformer, the magnetic tape 32 , A new magnetization track is formed.

[0020]

As described above, according to the present invention, the first drum fixing portion and the first drum having the first drum fixing surface for fixing the outer peripheral surface of the fixed lower drum of the rotary head device are formed. A second drum having a second drum fixing surface for fixing the outer peripheral surface of the fixed upper drum at a position deviated in a direction in which the ratio of the magnetic tape wound on the outer peripheral surface of the upper fixed drum to the fixing surface decreases. A drum connecting member constituting a fixing portion is provided, and a part of the outer space area of the outer peripheral surface of the fixed lower drum formed by the second drum fixing portion of the drum connecting member and the outer peripheral surface of the fixed lower drum is shared. Since the tape guide is arranged as described above, the outer peripheral surface of the fixed upper drum can be removed from the outer peripheral surface of the fixed upper drum without deteriorating the mechanical position accuracy of the outer peripheral surface of the magnetic tape of the fixed upper drum relative to the outer peripheral surface of the fixed lower drum. Magnetic tape Leads to shortening of the running path, size of the VTR can be can contribute to the spread of this type of VTR.

[Brief description of the drawings]

FIG. 1 is a plan view of a main part of a VTR incorporating a rotary head device according to an embodiment of the present invention.

FIG. 2 is a sectional view of the rotary head device.

FIG. 3 is a side developed view of a drum connecting member configured in the rotary head device.

FIG. 4 is a sectional view of a conventional rotary head device.

FIG. 5 is a plan view of a main part of a VTR in which the rotary head device is incorporated.

[Explanation of symbols]

 32 Magnetic tape 36 'First tape guide 43, 43' Recording head 44, 44 'Reproducing head 45 Rotating drum 46 Circular fixed upper drum 47 Circular fixed lower drum 47a Lead 64 Drum connecting member 64a First drum connecting member Drum fixing surface 64a 'First drum fixing portion of drum connecting member 64b Second drum fixing surface of drum connecting member 64b' Second drum fixing portion of drum connecting member 78 Second tape guide

Claims (1)

(57) [Claims] 1. An annular upper drum for winding a magnetic tape around an outer peripheral surface thereof, and a traveling height position of a magnetic tape positioned below the annular upper drum and guided to be wound around the outer peripheral surface in a helical manner. An annular lower drum having a lead to be fixed, and a first drum fixing portion and a first drum fixing portion on which an annular lower drum fixing surface for fixing an outer peripheral surface of the annular lower drum is formed.
A drum connection having a second drum fixing portion having an annular upper drum fixing surface for fixing an outer peripheral surface of the annular upper drum at a position deviated in a direction in which the magnetic tape wound around the annular upper drum decreases A rotating head provided between the annular upper drum and the annular lower drum, and a space formed by a second drum fixing portion of the drum connecting member and an outer peripheral surface of the annular lower drum. And a tape guide for winding a magnetic tape separated from an outer peripheral surface of the annular upper drum.