JPH03219402A - rotating drum device - Google Patents

Abstract

PURPOSE:To obtain high rotation accuracy by making some of connections between a transformer terminal and an upper transformer by a transformer terminal provided at a position rotated by 180 deg. from the original position. CONSTITUTION:A distribution board 11 fitted on an upper drum 3 so as to connect a head terminal 10 and the transformer terminal 12 is provided with a transformer terminal connection part 22 which connects a head terminal connection part 21 and the transformer terminal 12. A head 5a is connected to the coil of the upper transformer 7 through a head terminal 10a, a head terminal connection part 21a, a transformer terminal connection part 22a, and the transformer terminal and a head 5b is connected to the coil through 10a, 21b and 22b, etc. Thus, one connection part 22d is arranged on the electric conductor from the head terminal connection part 21b to the transformer terminal connection part 22d at the position rotated by 180 deg. and each one of the two transformer terminals is arranged at 180 deg. opposite positions and connected to the upper transformer 7 to obtain a rotary drum with good rotational balance.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a rotating drum device for a magnetic recording/reproducing device.

[Conventional technology]

FIG. 8 is a cross-sectional view showing a conventional rotating drum device. In the figure, l is a rotating shaft, 2 is a fixed lower drum, 3 is a rotating upper drum, and 4 is a screw that is removably screwed to the upper drum 3. 5 is a head fixed to the tip of the head stand 4; 6 is a bearing that allows the rotary shaft 1 to rotate freely relative to the lower drum 2; 7 is an upper transformer that rotates together with the upper drum 3. , 8 is a stationary lower transformer, 9 is a pedestal supported by the rotating shaft 1 and supports the upper drum 3, numeral 1 is a magnetic tape, and 1 is a head terminal pin.

The head 5 is held at a fixed position relative to the upper drum 3, and its tip protrudes slightly from the outer periphery of the upper drum 3. The upper drum 3 is rotated at a constant high speed.

A magnetic tape 13 is wound slightly diagonally around the outer peripheral surfaces of the upper drum 3 and the lower drum 2 and runs at a predetermined speed. Thus, the head 5 contacts the magnetic tape 13 to magnetically record or reproduce video (or audio) signals.

The upper transformer 7 is attached to the pedestal 9 and rotates together with the pedestal 9. The head 6 is a head terminal lO1 wiring board 11
, and is connected to the upper transformer 7 through transterminal authentication. The lower transformer 8 faces the upper transformer 7 with a slight interval therebetween. The upper and lower transformers 7.8 are magnetically coupled and mutually transmit signals. Lower transformer 8 is an external signal processing bag! (not shown).

4th □□□ is a view of the upper drum 3 with the bend 5 attached seen from the side. 15 is the hole into which Mr. Transterminal is inserted. Head 5a (The alphabet at the end of the code indicates the mounting position of the part.

(the same applies hereinafter) is connected via a wiring board 11 to a transterminal pressure inserted into a transterminal hole 15a adjacent to the head terminal 10a.

4a is only a head stand, and the head 5 is not provided.

FIG. 5 is a diagram showing the connection between the upper transformer 7 and the transformer terminal pressure. In the figure, 17 is a coil, 19 is an upper transformer board, 19 is a transformer terminal bin, and 1 is a land.

[Problem to be solved by the invention]

Since the conventional rotating drum device is configured as described above, in order to balance the rotation, it is necessary to provide an unconnected and unused transformer terminal, and 12Q and i
There was a problem in that because the transterminal bin 19 and the head terminal bin blades had to be assembled with care to avoid contact with each other because four locations such as 2a, 12h, and 12g were to be attached.

This invention was made to solve the above-mentioned problems, and it eliminates unused transterminals, reduces the number of transterminals, and provides an inexpensive rotating machine with good rotational balance and improved ease of assembly. The purpose is to obtain a drum device.

[Means to solve the problem]

The rotating drum device according to the present invention connects a part of the transformer terminal and the upper transformer with the transformer terminal provided at a position rotated 180 degrees from the original position, so that an unused transformer terminal for rotational balance can be used. is omitted.

[Effect]

The rotating drum device according to the present invention achieves rotational balance without arranging unused transformer terminals, and avoids contact between the solder portions of the transformer terminal bins and lands on the upper transformer board and the head terminal bins.

〔Example〕

An embodiment of this invention will be described below. FIG. 1 shows the connection between the trans terminal pressure and the upper transformer 7 of the rotating drum device according to the present invention. Each transterminal pressure is connected by a transterminal bin 19. Second
The figure shows a wiring board U mounted on the upper drum 3 for connecting the head terminal 10 and the transterminal [. In the figure, 21 is a head terminal connection part that connects the head terminal, and n is a transterminal connection part that connects the transterminal ν.

The head 5a has a head terminal lQa, a head terminal connection part 21a, and a transformer terminal connection part 22&%.
) It is connected to the coil 17a of the upper transformer 7 via the lance terminal 12a. Similarly, the head 5b has 1O
b41 is connected to the coil 171) via the pupil b12b. The same applies below.

As described above, in the wiring from the head terminal connection part 21d to the transterminal connection part 224, by arranging one of the transterminal connection parts 22d at a position rotated by 180 degrees, the two transterminals 12d
By arranging each one of these at positions rotated by 1000 pairs and connecting them to the upper transformer 7, a rotating drum with good rotational balance can be obtained.

The transformer terminal 12a has a built-in transformer terminal bin 19a connected to the land 2 on the upper transformer board.
0a, and connected to the coil 17a of the upper transformer. Transterminal 12a is connected to head 5&, 12b is connected to 5b, 12C is connected to 50, and 12d
is connected to 6d, 12e to 5e, 12f to 5f, and 12g to 5g.

12h is unconnected.

In the above embodiment, the connection between the coil 17 and the transformer terminal 12d was wired facing each other at 180° with the soil for the upper transformer board. Good too. Further, the wiring on the upper transformer board may be routed at an arbitrary angle and connected to the transformer terminal.

Further, in the above embodiment, connections were made at only one location, facing each other by 180 degrees, but connections may be made at a plurality of locations.

〔Effect of the invention〕

As described above, according to the present invention, by connecting the upper transformer 7 and the transformer terminal 12d so as to face each other by 180 degrees, the unused transformer terminal 12h for rotational balance is not used, and the upper transformer wiring Contact between the cow tab and the head terminal bin can be avoided, the device can be made at low cost, and high rotational accuracy can be obtained.

[Brief explanation of drawings]

FIG. 1 is a top view showing the main parts of a rotating drum device according to an embodiment of the present invention, FIG. 2 is a top view of a wiring board connecting a transformer terminal and a head terminal, and FIG. 8 is a sectional view of the rotating drum device. , FIG. 4 is a plan view showing the side where the head and head terminal are attached to the upper drum, and FIG.
The figure is a plan view showing the connection between a conventional upper transformer and a transformer terminal. In the figure, 1 is the rotating shaft, 2 is the lower drum, 3 is the upper drum, 6 is the head, 7 is the upper transformer, IO is the head terminal, U
is a wiring board, 12 is a transformer terminal, 17 is a coil,
The slide is the upper transformer board, 19 is the transformer terminal bin,
Nagi is the head terminal connection, η is the transterminal connection, and Ta is the head terminal bin.

Claims (1)

[Claims] In a rotating drum device having a fixed lower drum and a rotating upper drum, part of the connection between the transformer terminal and the upper transformer is made by routing the transformer coil on the upper transformer board,
A rotating drum device characterized in that a transformer terminal is provided at a position rotated by 180 degrees from an original position.