JPH10198904A - Rotary head drum device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to supply power to a rotating amplifier in a noncontact state, to inexpensively prevent the device from becoming large in size by using an existing rotary head drum device, by loading a rotor and a stator of a feeding rotary transformer respectively to the rotary drum side and fixed drum side. SOLUTION: The rotary head drum device 1A loads the feeding rotary transformer 30 on its lower part, and a shaft rotary supporting the rotary drum 3 is made a hollow shaft 10. That is, a feeding device by a slip ring and a brush is removed from the existing rotary head drum device, and the feeding device consisting of the feeding rotary transformer 30 and an AC/DC conversion circuit substrate 38 is loaded instead of it, and the supporting shaft is revised to the hollow shat 10. The output of the AC/DC conversion circuit substrate 38 is supplied to an amplifier substrate 15 through a lead wire 37 passing through the through hole 1001 of the hollow shaft 10. Thus, the existing rotary head drum device is diverted, and is dealt with layout control in limited capacity.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary head drum device for magnetically recording or reproducing video signals and information signals on a magnetic medium using a rotary magnetic head, and more particularly to a power supply means for the rotary magnetic head. It is about.

[0002]

2. Description of the Related Art First, a conventional rotary head drum device will be described with reference to FIG. FIG. 4 shows an example of a conventional rotary head drum device, FIG. A is a perspective view thereof, FIG. 4B is an enlarged side view of a part of the rotary head drum device of FIG. FIG. 5 is a cross-sectional view of the rotary head drum device of the related art, in which a support device that supports a slip ring and a brush is removed from the rotary head drum device of FIG. 4.

In FIGS. 4 and 5, reference numeral 1 denotes a conventional rotary head drum device. In the rotary head drum device 1, a fixed drum 2 and a rotary drum 3 are assembled coaxially around a rotary shaft 9, and a stator 1101 and a rotor 1102 are provided below the rotary shaft 9. The rotor 1102 of the driving motor 11 is attached. The stator 1101 is fixed to a lower part of the fixed drum 2. The rotor 1102 is fixed to an annular dish-shaped support plate 1104 fixed to a sleeve 1103. The rotary drum 3 is mounted on the upper portion of the rotary shaft 9 via a sleeve 13 fixed with a screw 12.
4 is attached.

A plurality of magnetic heads 4 are mounted at equal angular intervals on the outer peripheral portion of the inner surface of the rotary drum 3, and an amplifier connected to each of the magnetic heads 4 is mounted on the upper surface of the rotary drum 3. Amplifier substrate 15 on which is formed
Has been fixed.

Further, a rotor 21 of a signal rotary transformer 20 composed of a flat core for transmitting information signals such as video signals and audio signals is fixed to the lower surface of the sleeve 13 which rotates integrally with the rotary drum 3. And
An opposed stator 22 is fixed inside the upper surface of the fixed drum 2, and supplies an information signal to the magnetic head 4 via the amplifier substrate 15 by electromagnetic induction coupling during magnetic recording, and a magnetic head during magnetic reproduction. 4 to amplifier board 1
The information signal is transmitted from the stator 22 to the main body of the magnetic recording / reproducing apparatus by the electromagnetic induction coupling.

As shown in FIG. 4, a power supply device for supplying power to the amplifier on the amplifier board 15 is mounted on the rotary head drum device 1. As shown in FIG. 4A, the power supply device includes a slip ring 5 and a brush 6 extending from the rotation shaft 9. The brush 6 is held above the rotating drum 3 by a support device 7 fixed to a chassis (not shown),
Is supported and fixed so as to be in contact with the peripheral portion of. FIG.
B shows a portion of the slip ring 5 and the brush 6 in an enlarged manner. Reference numeral 8 indicates an insulating ring. The slip ring 5 is connected to a power supply circuit of each amplifier on the amplifier board 15, and the brush 6 is connected to a power supply device built in the magnetic recording / reproducing apparatus main body via a relay board 39. The power supply is configured to be supplied to the amplifier.

[0007]

As described above, conventionally, the power supply to each of the amplifiers in the rotary head drum device 1 is generally performed by the slip ring 5 and the brush 6.
However, since the slip ring 5 uses gold for the contact point, the cost is high, and the slip ring 5, the brush 6, and the supporting device 7 are used.
Is externally attached to the upper portion of the rotary head drum device 1, the volume occupied by the rotary head drum device 1 protruding above the chassis of the magnetic recording / reproducing device and the power supply device is increased, and the ultra-small magnetic recording / reproducing device Not suitable for

Further, it is conceivable that the power supply rotary transformer is built in the rotary head drum device 1. In this case, however, in order to incorporate the power supply rotary transformer, the rotary head drum device 1 itself is required. There is a problem that the structure needs to be changed, and the design change requires cost and time, and the rotary head drum device is accordingly expensive.

SUMMARY OF THE INVENTION An object of the present invention is to solve such a problem, and it is possible to supply electric power to a rotating amplifier in a non-contact state, and to divert an existing rotating head drum device to reduce the cost. It is an object of the present invention to obtain a rotary head drum device capable of preventing an increase in size.

[0010]

Accordingly, a rotary head drum device according to the present invention has a rotary drum rotatably supported by a hollow shaft, is mounted coaxially with a fixed drum, and is provided with a magnetic head and a magnetic head. In a rotary head drum device in which an amplifier connected to the magnetic head is fixed, power is supplied to the amplifier from a rotor having a coil mounted thereon and a stator having a coil mounted opposite to the rotor. The rotor is mounted on the rotary drum side, the stator is mounted on the fixed drum side coaxially with the hollow shaft, and the lead wire of the coil on the rotor side is In order to solve the above-mentioned problem, a configuration is adopted in which the amplifier is connected to the amplifier through the hollow shaft.

Therefore, according to the present invention, the rotary head drum device of the prior art can be used and can be constructed without increasing the size.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A rotary head drum device according to the present invention will be described below with reference to FIGS. FIG. 1 is a sectional view of a rotary head drum device according to an embodiment of the present invention, and FIG. 2 shows a power supply rotary transformer having a structure mounted below the rotary head drum device shown in FIG. FIG. A is a plan view thereof, and FIG.
FIG. 3 is a sectional view taken along a line, and FIG. 3 is a power supply circuit configuration diagram of a power supply device including a power supply rotary transformer mounted on the rotary head drum device of the present invention. The same components as those of the rotary head drum device 1 according to the prior art are denoted by the same reference numerals.

In FIG. 1, reference numeral 1A indicates a rotary head drum device of the present invention. This rotary head drum device 1A
Also, the fixed drum 2 and the rotating drum 3 rotate via a bearing 9A, and are coaxially assembled around a hollow shaft 10 having a through hole 1001 formed therein. The rotor 1102 of the drive motor 11 composed of the motor 110 and the rotor 1102 is attached. The stator 1101 is fixed to a lower part of the fixed drum 2. The rotor 1102 is fixed to an annular dish-shaped support plate 1104 fixed to a sleeve 1103. The rotary drum 3 is mounted on the upper part of the hollow shaft 10 with screws 14 via a sleeve 13 fixed with screws 12.

A plurality of magnetic heads 4 are mounted on the outer peripheral portion of the inner surface of the rotary drum 3 at equal angular intervals, and an amplifier connected to each of the magnetic heads 4 is mounted on the upper surface of the rotary drum 3. Amplifier substrate 15 on which is formed
Has been fixed. Further, a rotor 21 of a signal rotary transformer 20 having a flat core for transmitting information signals such as a video signal and an audio signal is fixed to a lower surface of the sleeve 13 which rotates integrally with the rotating drum 3. An opposed stator 22 is fixed inside the upper surface of the fixed drum 2, and supplies an information signal to the magnetic head 4 via the amplifier substrate 15 by electromagnetic induction coupling during magnetic recording, and a magnetic head during magnetic reproduction. 4 to the rotor 21 via the amplifier board 15 and information signals to the stator 22 and the magnetic recording / reproducing apparatus main body by electromagnetic induction coupling. This configuration is the same as the rotary head drum device 1 of the prior art.

The rotary head drum device 1A of the present invention has a power supply rotary transformer 30 mounted on its lower part, and a shaft (hollow shaft 10) for rotatably supporting the rotary drum 3.
Is characterized by being hollow. As shown in FIG. 2, the power supply rotary transformer 30 includes an annular rotor 31.
An annular stator 32 having an inner diameter slightly larger than the outer diameter of the rotor 31 is coaxially arranged. An annular groove 33 is formed on the outer peripheral surface of the rotor 31, and a coil 34 is wound and mounted in the annular groove 33. An annular groove 35 is formed on an inner peripheral surface of the stator 32 facing the annular groove 33 of the rotor 31, and the coil 3 is formed in the annular groove 35.
6 is wound and mounted.

The rotor 31 is, as shown in FIG.
The sleeve 1103 to which the support plate 1104 of the rotor 1102 of the drive motor 11 is attached and the support plate 1104
And is fixed to the outer peripheral edge of the support plate 1104. The stator 32 is provided on an outer peripheral surface of the rotor 31.
It is fitted coaxially with it and fixed to the lower part of the fixed drum 2.

The tip of the lead wire of the rotor 31 is soldered to the input terminal of the AC / DC conversion circuit board 38 fixed to the lower surface of the support plate 1104, and the output of the AC / DC conversion circuit board 38 is The tip of the lead wire 37 soldered to the terminal is inserted into the through hole 1001 from the lower end of the hollow shaft 10, passes through the through hole 1001, and the tip coming out from the upper end of the rotary drum 3 It is soldered to a power circuit terminal of the amplifier board 15 fixed on the upper surface. On the other hand, the end of the coil 36 of the stator 32 is soldered to the relay board 39, and power is supplied from a power supply device built in the magnetic recording / reproducing apparatus main body.

As described above, the power supply device including the hollow shaft 10, the power supply rotary transformer 30, the amplifier board 15, the AC / DC conversion circuit board 38, the relay board 39, etc.
Electric power is supplied from the power supply device of the magnetic recording / reproducing apparatus body to the stator 32 side of the power supply rotary transformer 30, and is induced and transmitted to the rotor 31 of the power supply rotary transformer 30 which is electromagnetically coupled to the stator 32. That A
The C power is converted into DC power by an AC / DC conversion circuit board 38 fixed to the rotor 1102 of the drive motor 11 and supplied to the power supply circuit of the amplifier on the amplifier board 15 via the lead wire 37.

In this way, the amplifier is supplied with electric power and is in a state where it can perform an amplifying operation normally. Accordingly, the information signal from the magnetic recording / reproducing apparatus main body is supplied to the amplifier on the amplifier substrate 15 via the signal rotary transformer 20, and is amplified and applied to the magnetic head 4. The information signal reproduced by the magnetic head 4 is amplified by an amplifier on the amplifier substrate 15 and processed by a signal processing circuit in the magnetic recording / reproducing apparatus main body via the signal rotary transformer 20.

As described above, according to the rotary head drum device of the present invention, the existing rotary head drum device 1 except for the slip ring 5 and the brush 6 of the prior art can be used with little modification. . That is, when assembling the conventional rotary head drum device 1A, the slip ring 5 and the brush 6 are not used, and the support shaft is replaced with the hollow shaft 10A.
Just change it to After that, the rotor 31 of the power supply rotary transformer 30 and the AC / DC conversion circuit board 38
Is fixed to the support plate 1104 of the rotor 1102 of the drive motor 11, the tip of the coil 34 is soldered to the AC / DC conversion circuit board 38, and the lead wire 37 on the output side of the AC / DC conversion circuit board 38 is hollow. Inserted into the through hole 1001 of the shaft 10 and soldered to the amplifier board 15, the stator 32 of the power supply rotary transformer 30 is fixed to the lower surface of the fixed drum 2, and the tip of the coil 36 is connected to the relay board 3.
9 only needs to be soldered.

[0021]

As described above, the rotary head drum device 1A of the present invention can utilize the existing rotary head drum device and can be assembled within the maximum outer dimensions of the rotary head drum device. It is possible to cope with the layout regulation in the inside. In addition, since the power supply rotary transformer can be incorporated with a sufficient distance from the information signal transmission path formed by the signal rotary transformer, there is no mutual interference and an effect of being strong against noise can be obtained.

[Brief description of the drawings]

FIG. 1 is a sectional view of a rotary head drum device according to an embodiment of the present invention.

2A and 2B show a power supply rotary transformer having a structure mounted below the rotary head drum device shown in FIG. 1; FIG. 2A is a plan view thereof, and FIG. FIG.

FIG. 3 is a power supply circuit configuration diagram of a power supply device including a power supply rotary transformer mounted on the rotary head drum device of the present invention.

4A and 4B show an example of a conventional rotary head drum device, FIG. 4A is a perspective view thereof, and FIG. 4B is an enlarged side view of a part of the rotary head drum device of FIG.

5 is a cross-sectional view of the conventional rotary head drum device shown in FIG. 4 from which the support device that supports the slip ring and the brush is removed from the rotary head drum device.

[Explanation of symbols]

1A: rotating head drum device of the present invention, 2: fixed drum, 3: rotating drum, 4: magnetic head, 10: hollow shaft,
1001 through hole, 11 drive motor, 1101 stator, 1102 rotor, 1103 sleeve, 110
4 support plate, 13 sleeve, 15 amplifier board, 20
... Rotary transformer for signal 21 Rotor of rotary transformer 20 for signal 22 Stator of rotary transformer 20 for signal 30 Rotary transformer for power supply
31 ... rotor of power supply rotary transformer 30, 32 ...
The stator of the power supply rotary transformer 30, 33 ... annular concave grooves 33 and 34 on the rotor 31 side, 35 ... annular concave grooves on the stator 32 side, 36 ... coil on the stator 32 side, 37 ... lead wires, 38: AC / DC conversion circuit board, 39: Relay board

Claims (1)

[Claims] 1. A rotary head in which a rotary drum is rotatably supported by a hollow shaft, mounted coaxially with a fixed drum, and a magnetic head and an amplifier connected to the magnetic head are fixed to the rotary drum. In the drum device, the power supply to the amplifier is performed by a rotary transformer including a rotor on which a coil is mounted and a stator on which a coil is mounted in opposition to the rotor. Side, the stator is coaxially mounted on the fixed drum side with respect to the hollow shaft, and the lead wire of the coil on the rotor side is connected to the amplifier through the hollow shaft. Characterized rotary head drum device.