JPH0445128Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention is a magnetic recording and reproducing device that uses a helical scan method to record signals on a magnetic tape and to reproduce signals recorded on a magnetic tape. This invention relates to a rotating magnetic head drum device used for.

(Prior Art) Conventionally, a rotary head drum device used in a magnetic recording and reproducing apparatus, such as a video tape recorder, which performs recording and reproducing by a helical scan method, has generally been constructed as shown in FIG. That is, a lower drum 4 is attached to a rotary shaft 2 of a motor 1 with bearings 3, 3 interposed therebetween, and an upper drum 4 is attached to the upper part of this rotary shaft 2 with a magnetic head 6 attached with a disk 5 interposed therebetween. It is fixed to the drum 7. Note that 8 is a screw for fixing the upper drum 7 to the disk 5. Furthermore, the upper drum 7 is moved to the rotating shaft 2.
A rotor-side core 10 of a rotary transformer 9 is attached to the disk 5 attached to the disk 5, and a stator-side core 11 is attached to the lower drum 4 so as to face the rotor-side core 10. The rotary transformer 9 transmits signals between the upper drum 7, which is rotated by the rotary transformer 9, and the lower drum 4, which is fixed to a chassis (not shown) or the like.

(Problem to be solved by the invention) However, in the conventional rotating magnetic head drum device 12 described above, the rotor-side core 1 of the rotating transformer 9
When increasing the number of grooves 14, 14, in which coils 13, 13, which are provided at opposing positions on the 0 and stator side core 11 and transmit signals, are inserted, the sizes of the drums 4, 7 are determined by the standard. Since the diameter of the rotary transformer 9 cannot be increased, the number of grooves 14, 14, . . . is increased by reducing the distance between adjacent grooves 14, 14, . Therefore, there is a drawback that crosstalk occurs between the adjacent grooves 14, 14, and adversely affects the signal.

(Means for Solving the Problems) The present invention aims to eliminate the drawbacks of the above-mentioned conventional device, and provides a second rotary transformer above the upper drum to transmit signals.

(Example) Hereinafter, the present invention will be explained according to the example shown in FIG. Note that the same numbers are used for parts in FIG. 2 that correspond to those in FIG. 1. In these drawings, 1 is the motor, 2 is the rotating shaft of the motor 1,
3 is a bearing, 4 is a lower drum, 5 is a disk, 6 is a magnetic head, 7 is an upper drum, and 8 is a screw. Furthermore, the stator-side core 11 and rotor-side core 10 of the first rotary transformer 9 are disposed opposite to the disk 5 and lower drum 4 of the rotating magnetic head drum device 15 constructed as described above, as in the prior art. Further, in the rotating magnetic head drum device 15 in this embodiment, a second rotating transformer 16 is attached above the upper drum 7 as will be described in detail below. That is, the upper drum 7
A rotor holder 18 for the rotor-side core 17 is attached to the upper side by fitting into the rotating shaft 2, and the rotor holder 18 is provided with a shaft 19 so as to protrude upward. 17 is installed. Further, bearings 20, 20 are interposed in the shaft 19, and the stator holder 2 of the stator side core 21 is connected to the shaft 19.
2 is attached to the stator holder 22, and a collar 23 for fixing the stator holder 22 is attached to the upper end, and the stator side core 21 is attached to the stator holder 22 so as to face the rotor side core 17. There is. Further, a holding arm 25 fixed to the chassis 24 or the like is attached to the stator holder 22 of the stator side core 21 with screws 26.
This prevents the stator side core 21 from rotating during recording and reproduction.

Therefore, in the rotating magnetic head drum device 15 in the above embodiment, it is not necessary to reduce the interval between the signal transmission grooves 27, 27, etc. provided in the first rotary transformer 9, so that the signal is not affected by crosstalk or the like. can be prevented from having a negative impact on

(Effects) As described above, the present invention has a rotatable upper drum and a fixed lower drum, a magnetic head is attached to the upper drum, and a magnetic head is attached to the upper drum and the lower drum. In a rotating magnetic head drum device in which a rotor-side core and a stator-side core of a rotary transformer are arranged opposite to each other, and a second rotary transformer is attached above the upper drum, the rotor-side core of the second rotary transformer is A rotor holder that holds the stator side core of the second rotating transformer is mounted on the upper drum, and the stator holder that holds the stator side core of the second rotating transformer is connected to the rotor holder by a shaft via a bearing. Since the stator holder is separably connected to the chassis and is fixed to the chassis by a holding arm, the number of grooves can be increased without reducing the interval between the grooves of the rotating transformer. The signal will not be adversely affected by talk etc.

In addition, since the second rotating transformer itself has a shaft, it is possible to maintain the parallelism and gap between the rotor-side core and the stator-side core with high accuracy, and it is also easy to install and remove. Serviceability will improve.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view of a conventional rotating magnetic head drum device, and FIG. 2 is a vertical cross-sectional view of one embodiment of the device of the present invention. 4...Lower drum, 6...Magnetic head, 7...
Upper drum, 9...first rotating transformer, 10,
17... Rotor side core, 11, 21... Stator side core, 15... Rotating magnetic head drum device, 1
6... Second rotary transformer, 18... Rotor holder, 22... Stator holder, 25... Holding arm.

Claims (1)

[Claims for Utility Model Registration] It has a rotatable upper drum 7 and a fixed lower drum 4, and a magnetic head 6 is attached to the upper drum 7. A rotor-side core 10 and a stator-side core 11 of the first rotary transformer 9 are arranged to face each other,
A second rotary transformer 1 is installed above the upper drum 7.
In the rotating magnetic head drum device in which the upper drum 7 is attached, the rotor holder 18 that holds the rotor-side core 17 of the second rotary transformer 16 is attached to the upper drum 7.
A stator holder 22 is attached to the top and holds the stator side core 21 of the second rotating transformer 16.
The second rotary transformer 16 is integrally and separably connected to the shaft 19 via the rotor holder 18 and the bearing 20 when disassembled, and the stator holder 22 is fixed to the chassis 24 by the holding arm 25. Features a rotating magnetic head drum device.