JPH0320884Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a rotating drum device, and particularly to a rotating drum device used in a recording/reproducing device.

(Prior Art) In recent years, information signals (e.g., video signals, audio signals) are transferred to magnetic recording media (hereinafter referred to as magnetic With the rapid spread of so-called video tape recorders (hereinafter referred to as VTRs), which are recording and reproducing devices that can record and reproduce data on recording media such as・Size and weight reduction are actively being carried out, and as a result, a wide variety of
VCRs have appeared.

In particular, in order to reduce the size and weight of the VTR mentioned above, the rotating drum device, which occupies a relatively large volume among the components of the VTR and is used for recording and reproducing information signals, has to be downsized (the diameter of the rotating drum can be reduced). It is possible that

(Problems to be solved) However, if the diameter of the rotating body of the rotating drum device (hereinafter referred to as the rotating drum) is reduced, the inertia of the rotating drum will be reduced, resulting in uneven rotation (jitter). more likely to occur.

In order to prevent this jitter, it is possible to attach a flywheel to the rotating drum device or increase the inertia of the rotating drum by increasing the weight of the rotating drum itself, but if the inertia of the rotating drum is increased as described above, This increases the weight of the VTR, making it difficult to reduce the size and weight of the VTR, making it particularly unsuitable for portable VTRs, where the weight of the VTR affects its operability.

In addition, in a VTR, when a signal recorded on a magnetic tape is normally reproduced by a magnetic head attached to a rotating drum device, the output signal from the magnetic head is transferred to a rotary transformer (the magnetic head is attached to a rotating drum device, Since it cannot be directly connected to a signal processing circuit such as a preamplifier, it is connected magnetically using a rotary transformer, etc.)
For example, the signal is supplied to a preamplifier via the preamplifier, and the preamplifier reaches a predetermined signal level (as the output signal from the magnetic head is weak, the signal level is such that it can be sufficiently processed by a subsequent signal processing circuit, etc.). amplified.

Therefore, it is necessary to make the connection distance between the magnetic head and the preamplifier as short as possible to prevent noise from being superimposed on the output signal from the magnetic head.

However, as mentioned above, since the rotary transformer is inserted between the magnetic head and the preamplifier, there is a limit to how short the connection distance from the magnetic head to the preamplifier can be. Furthermore, in order to shorten the connection distance from the magnetic head to the preamplifier, for example, when a circuit board such as a preamplifier is mounted on a rotating drum device, supplying power to the circuit board becomes a problem.

To explain specifically, conventionally, when a circuit board is mounted on a rotating drum device, in order to supply power to the circuit board, DC power is supplied from the outside using a slip ring, etc., or AC power is supplied from the outside. It has been considered to use a rotary transformer to supply DC power to the rotating drum device, and provide a rectifier circuit on the rotating drum device side to rectify the AC power to supply DC power. However, noise is generated when power is supplied from outside due to slip-ring, etc., so there is a risk that noise will be superimposed on the reproduction signal from the magnetic head.Also, AC power is supplied via a rotary transformer, If a rectifier circuit is provided on the rotating drum device side to supply DC power, there is a problem in that the configuration becomes complicated. On the other hand, for example,
As shown in Japanese Patent No. 57-37705, a rotating magnetic head device equipped with an alternating current generator has been proposed.
The alternating current power supplied by the alternating current generator requires a rectifying circuit on the circuit board of the rotating drum as described above, which also complicates the rotating drum apparatus.

Furthermore, a rotating drum device can be used, for example, so that independent magnetic heads can be used for the standard time recording and reproducing mode and for the long time mode, which allows higher density recording and reproducing than the standard time recording and reproducing mode. When the number of magnetic heads is increased, as in the case of configuring the magnetic head, it becomes necessary to further increase the number of rotary transformers, and there is also a problem in that the manufacturing cost increases accordingly.

Therefore, this invention aims to reduce the size and weight of the recording/reproducing device by rotating the battery, which is the power supply source, together with the rotating drum, and at the same time, increases the inertia of the drum, prevents uneven rotation of the drum, and reduces jitter. It also makes it easier to supply power to a signal processing circuit such as a preamplifier that is connected to the magnetic head and located close to the magnetic head. An object of the present invention is to provide a rotating drum device that can obtain a high-quality reproduced image by preventing deterioration of the quality of the reproduced signal due to superimposition of noise or the like on the reproduced signal.

(Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention provides a system for recording information signals onto a recording medium or recording information signals recorded on a recording medium using a rotating head attached to a rotating body. A rotating drum device used in a recording/playback device for reproducing data, which includes a circuit board mounted on the rotating body and connected to the rotating head, and a DC power source that rotates with the rotating body and connects at least the circuit board. This configuration consists of a battery that supplies

(Embodiment) The figure is a sectional view of an embodiment of a rotating drum device according to the present invention.

An embodiment of the rotating drum device according to the present invention will be described below with reference to the drawings. In the figure, 1 is a rotating drum device, 2 is a chassis, 3 is a lower drum,
4 is a motor, 5 is a shaft, 6 is an upper drum that is a rotating body, 7 is a battery case, 8 is a magnetic head (rotating head), 9 is a circuit board, 10 and 11 are rotary transformers, and 12 is a power supply source. Battery, 13 is an electrode, 14a, 14b is an insulating material, 15 is a conductive path, 16 is a slip ring, 17
is the lid of the battery case, 18 is the electrode, 19 is the conductive path, 20 is the slip ring, 21 is the exterior, 22
is the exterior lid.

A lower drum 3 is attached to the upper part of a chassis 2 for attaching a rotating drum device 1 used in a magnetic recording/reproducing device, etc., and a motor 4 is attached to the lower part of the chassis 2. A shaft 5, which is a rotating shaft of the motor 4, passes through the center of the chassis 2 and the lower drum 3 in a rotatable state, and an upper drum 6 is attached to the upper part of the shaft 5, that is, above the lower drum 3. A battery case 7 is attached to the lower part of the shaft 5, that is, below the motor 4. In addition,
The upper drum 6 and battery case 7 are connected to the motor 4
and a shaft 5 so as to be rotatable.

A magnetic head 8 is attached to the outer peripheral surface of the upper drum 6, and operates as a rotating head when the upper drum 6, which is a rotating body, rotates. A circuit board 9 is attached, and a rotary transformer 10 is attached to the lower part of the upper drum 6 (the surface facing the upper part of the lower drum 3). Further, a rotary transformer 11 is attached to the upper part of the lower drum 3 (at a position opposite to the rotary transformer 10 attached to the lower part of the upper drum 6).

An electrode 13 is formed on the upper part of the battery case 7 and comes into contact with the positive electrode of the battery 12 when the battery 12 is installed inside the battery case 7. The slip ring 16 is connected to a positive power supply terminal of an electronic circuit board (not shown in the figure) that requires a power source. Further, the electrode 13 is connected to the conductive path 1
It is connected to a positive power supply terminal of a circuit board 9 attached to the upper drum 6 via the rear shaft 5 via the rear shaft 5 .

A battery case lid 17 is detachably attached to the lower part of the battery case 7, and the battery case lid 17 has an electrode 18 that contacts the negative electrode of the battery 12 when the battery 12 is installed inside the battery case 7. The electrode 18 is connected to the slip ring 20 via the lid 17 of the battery case, which also serves as a conductive path, and a conductive path 19 formed inside the battery case 7 by insulating materials 14a and 14b. The slip ring 20 is connected to a negative power supply terminal of an electronic circuit board or the like (not shown in the figure) that requires power. Further, the electrode 18 is connected to the shaft 5 via the lid 17 of the battery case and the conductive path 19, and the shaft 5 is connected to the negative power supply terminal of the circuit board 9 attached to the upper drum 6.

That is, DC power is supplied from the battery 12 to the inside of the shaft 5 and through the shaft 5 to the circuit board 9, and the slip rings 16 and 20
DC power is supplied to components of the VTR that require DC power, such as electronic circuit boards (not shown in the figure), through the VTR.

Further, a portion of the exterior 21 of the VTR facing below the battery case lid 17 is an exterior lid 22, which can be opened and closed to replace the battery 12. Note that since it is dangerous to open the exterior lid 22 while the motor 4 is rotating, the exterior lid 22 is locked to prevent it from being opened while the motor 4 is rotating. It is configured as follows.

The magnetic head 8 is connected to a circuit board 9, and the circuit board 9 is connected to a rotary transformer 10. Further, the rotary transformer 10 is magnetically coupled to the rotary transformer 11, and therefore, the magnetic head 8 is connected to a signal processing circuit (not shown in the figure) via the circuit board 9 and the rotary transformers 10 and 11. are doing.

In other words, the signal path during playback is as follows. The information signal recorded on the magnetic tape is reproduced by the magnetic head 8, and this information signal is input to an input terminal of a circuit board 9 such as a preamplifier.

Furthermore, as described above, since the upper drum 6, battery 12, and battery case 17 are configured to rotate together, even if the diameter of the upper drum 6 is reduced to make the VTR smaller and lighter, the battery 12 and battery case 17 Since the inertia of the upper drum 6 is increased by the weight of the battery case 17, uneven rotation is less likely to occur, and jitter is therefore reduced. Furthermore, since the battery 12 and the battery case 17 are always necessary when the VTR is a portable VTR, the upper drum 6 can be made smaller and lighter by the weight of the battery 12 and the battery case 17. It is possible to make the entire VTR smaller and lighter.

Note that since DC power is supplied to the circuit board 9 from the battery 12 which is configured to rotate together with the upper drum 6, the circuit board 9 is supplied with DC power via the slip ring as explained in the section (Problems to be solved). Noise generated when power is supplied to the circuit board 9 is not superimposed on the reproduced signal from the magnetic head 8. Therefore, the noise component is not amplified along with the signal component by a preamplifier, etc., and only the signal component is amplified by the preamplifier, etc., so the signal-to-noise (S/N) ratio is improved and a high-quality reproduced signal can be obtained. It can be supplied to a subsequent signal processing circuit, etc.
Furthermore, power supply to the circuit board 9 becomes easier.

Furthermore, as explained in the section (Problems to be Solved), the magnetic head can be used, for example, in standard time recording and playback mode and in long-time mode, which allows higher density recording and playback than standard time recording and playback mode. When the number of magnetic heads is increased, such as when configuring a rotating drum device to use independent magnetic heads for recording, playback, or recording/playback, switching of the magnetic heads may be done on top of the rotating drum device. By installing switching circuits such as electronic switches or relays, and using these switching circuits, it is possible to reduce the number of rotary transformers, and the structure of the rotary transformer is simplified, which reduces the increase in the cost of rotary transformers. This makes it easier to prevent this and improve performance.

(Effects of the invention) Since the invention has the above-mentioned configuration, DC power is supplied from the battery to the circuit board of the rotating drum, so there is no need to provide a separate rectifier circuit to the rotating drum device, simplifying the device. At the same time, it is possible to reduce the size and weight of the recording/reproducing device, increase the inertia of the drum, prevent uneven rotation of the drum, and reduce jitter. This has the advantage of making it easier to supply power to the circuit board even when the circuit board is damaged, and making it possible to obtain high-quality reproduced images by preventing deterioration of the quality of the reproduced signal due to the superimposition of noise, etc. on the reproduced signal. .

[Brief explanation of the drawing]

The figure is a sectional view of one embodiment of the rotating drum device according to the present invention. 1... Rotating drum device, 2... Chassis, 3...
... lower drum, 4 ... motor, 5 ... shaft,
6... Upper drum, 7... Battery case, 8
...Magnetic head, 9...Circuit board, 10, 11...
...Rotary transformer, 12...Battery, 1
3... Electrode, 14a, 14b... Insulating material, 15...
...Conducting path, 16...Slip ring, 17...Battery case lid, 18...Electrode, 19...Conducting path, 20...Slip ring, 21...Exterior,
22...Exterior lid.

Claims (1)

[Scope of utility model registration request] A rotating drum device used in a recording/reproducing device that records information signals on a recording medium or reproduces information signals recorded on a recording medium using a rotating head attached to a rotating body, A rotating drum device comprising a circuit board mounted on a tower and connected to the rotating head, and a battery that rotates together with the rotating body and supplies DC power to at least the circuit board.