JPH1166525A - Rotating head drum - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To eliminate the need for solder removal and attachment work when assembling or replacing a slip ring. SOLUTION: A connector pin 54 is provided between a harness 51 and a substrate 24 inside the drum which is integrally rotated with a slip ring drawn out of a slip ring 21 which is detachably attached to a drum shaft 5. And a connector 52 having a connector socket 55 and electrically detachably connected thereto.

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 most suitable for application to a helical scan type magnetic recording / reproducing apparatus such as a video tape recorder, and more particularly to a technique for connecting a slip ring to a substrate in the drum. Belongs to the field.

[0002]

2. Description of the Related Art Conventionally, there is a rotary head drum shown in FIGS. 5 and 6 which is applied to a helical scan type magnetic recording / reproducing apparatus such as a video tape recorder. This is a rotating head drum of an upper drum rotating system, in which a horizontal fixed lower drum 2 is arranged at the lower part of a horizontal rotating upper drum 1 at the same center P shape, and a plurality of The rotating magnetic head 3 is mounted horizontally.

A vertical cylindrical central cylindrical portion 2a is integrally formed on the center P of the fixed lower drum 2, and a drum shaft 5 has a pair of upper and lower ball bearings 6 in the central cylindrical portion 2a. It is vertically and rotatably mounted through the center. A rotary flange 7 is fixed to the drum shaft 6 in the vicinity of the upper end 5a by press-fitting or the like, and the upper rotary drum 1 is detachably mounted on the outer periphery of the upper portion of the rotary flange 7 by a plurality of mounting screws 8. I have. And a motor stator 9 fixed in the fixed lower drum 2;
Motor rotor 1 fixed to the outer periphery of the lower part of rotating flange 7
0 constitutes a spindle motor 11,
The rotating drum 1 is integrally rotated with the drum shaft 5 by the spindle motor 11. The rotary transformer is fixed by a rotary transformer stator 12 fixed to the outer periphery of the central cylindrical portion 2 a of the fixed lower drum 2 and a rotary transformer rotor 13 fixed to the lower portion of the rotary flange 7 and inserted into the outer periphery of the stator 12. A transformer 14 is configured. A motor connector 15 and a rotary transformer connector 16 are attached to a lower portion of the fixed lower drum 2, and a preload ring 17 is attached to an outer periphery of a lower end 5 b of the drum shaft 5.

A slip ring 21 is inserted into and removed from the outer periphery of the upper end 5a of the drum shaft 5 by a fitting hole 22a formed in the slip ring base 22, and is fitted on the same center P, and the slip ring 21 A ring base 22 is detachably mounted on the rotating flange 7 by a plurality of mounting screws 23. A plurality of brush contact rings 21a are mounted on the slip ring 22 at equal intervals in the vertical direction. The in-drum substrate 24 composed of a double-sided substrate is inserted into the outer periphery of the slip ring base 22 by a center hole 24a formed at the center thereof, and is horizontally arranged inside the rotating upper drum 1. At this time, the outer periphery of the in-drum substrate 24 is placed horizontally on an annular substrate supporting step 25 formed on the inner periphery of the upper end of the rotating upper drum 1, and Spacer 26
And, it is detachably attached to the inside of the rotating drum 1 by the attaching screw 27. And slip ring base 2
The tips of a plurality of slip ring harnesses 28 drawn out of the brush contact rings 21a of a plurality of upper and lower stages of the slip ring 21 through 2 are soldered onto a plurality of solder lands 29 on the substrate 24 in the drum.

[0005] An annular relay board 31 is screwed on the rotating flange 7 below the in-drum board 24, and a plurality of board contacts 32 mounted on the relay board 31 are attached to the lower surface of the in-drum board 24. Are bonded to a plurality of crimp lands, and a rotary transformer 14 is
The plurality of rotary transformer windings 14a drawn from the stator 12 and the plurality of head harnesses 3a drawn from the rotating magnetic heads 3 are connected by soldering or the like.

A brush mounting base 34 is attached to the side surface of the fixed lower drum 2 by a plurality of mounting screws 35, and a plurality of brush mounting bases 37 are mounted on the brush mounting base 34 by a plurality of mounting screws 36. The brushes 38 are mounted horizontally at equal intervals in the vertical direction by a brush holder 39 and a plurality of mounting screws 40. The tips of the plurality of brushes 39 are the brush contact rings 21 a of the upper and lower stages of the slip ring 21.
It is pressed against the side surface.

The rotary head drum supplies power and control signals supplied from a power supply circuit and a control circuit (not shown) to the plurality of brushes 38 by a flexible cable or the like to the drum substrate 24 via the slip ring 21. Further, the substrate contact 32 → the relay substrate 31 → the rotary winding 14a → the rotary transformer 1
The rotation motor 4 is supplied to a spindle motor 11 via the spindle motor 4 so as to control the rotation of the upper drum 1 and to transmit and receive a recording signal and a reproduction signal to and from the plurality of rotating magnetic heads 3. .

[0008]

In particular, in a helical scan type magnetic recording / reproducing apparatus such as a camera-integrated video tape recorder or a portable video tape recorder, the rotary head drum and the tape traveling mechanism have been significantly reduced in size. I have. On the other hand, since the slip ring 21 and the brush 38 for supplying power or the like to the drum substrate 24 have a structure in which the slip ring 21 and the brush 38 rotate and slide with respect to each other, wear due to the use of the slip ring 21 and the brush 38 is inevitable. If the slip ring 21 and the brush 38 reach the wear limit, electrical conduction cannot be performed, so that the slip ring 21 and the brush 38 need to be replaced.

However, in the conventional rotary head drum, the tips of the plurality of harnesses 28 drawn out of the slip ring 21 are soldered to the plurality of solder lands 29 of the substrate 24 inside the drum. At the time of replacement, it is necessary to perform the work of detaching and soldering the tips of the plurality of harnesses 28 on the plurality of solder lands 29.
At this time, as the size of the rotary head drum is reduced, the degree of circuit integration on the substrate 24 inside the drum increases, and a plurality of solder lands 29 are arranged in a narrow space on the substrate 24 inside the drum. Soldering of the tips of the plurality of harnesses 28 on the plurality of soldering lands 29 must be carefully performed in a narrow space, and the work of attaching and detaching the solder requires a great deal of labor and time. Further, the flux (gas) generated during the solder desorption operation is likely to adhere to the surface of the plurality of brush contact rings 21a of the slip ring 21, which causes secondary defects such as poor conduction with the brush 38 and an increase in contact resistance. Was often the case.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and has as its object to provide a rotary head drum that enables easy replacement of a slip ring.

[0011]

In order to achieve the above object, a rotary head drum according to the present invention has a slip ring detachably mounted on a drum shaft and a slip ring inside the drum which is integrally rotated with the drum shaft. The substrate is electrically detachably connected to the substrate by a connector.

[0012] The rotary head drum of the present invention configured as described above, when replacing the slip ring configured to be detachable from the drum shaft, with respect to the substrate in the drum that is rotated integrally with the drum shaft. The connector can be electrically connected and separated by the connector, so that the soldering work in a narrow space on a plurality of soldering lands of the substrate in the drum, which is conventionally required, becomes unnecessary.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a rotary head drum to which the present invention is applied will be described below with reference to FIGS. The same components as those in FIGS. 5 and 6 are denoted by the same reference numerals, and the description will not be repeated.

First, a brush contact ring 21 of a plurality of upper and lower stages of a slip ring 21 is passed through a slip ring base 22.
a plurality of slip ring harnesses 51 drawn out from a
Is made of a flexible wire or a flexible cable. Further, a connector 52 is provided for electrically detachably connecting the tips of the plurality of slip ring harnesses 51 and the substrate 24 in the drum.

The connector 52 is vertically mounted on a small-area connector board 53, protrudes downward from the connector board 53, and is a plurality of connector males arranged in parallel in a row. Connector pin 54
And a plurality of cylindrical connector sockets 55 which are vertically mounted on the substrate 24 in the drum and are arranged in parallel in a line, which are the connector female sides. Then, the tip of a plurality of slip ring harnesses (or flexible cables) 25 pulled out from the slip ring 21 is formed on a connector substrate 53 and a plurality of wiring patterns 5 connected to a plurality of connector pins 54.
6 is soldered on the soldering land 57 at the tip.

Therefore, as shown in FIG. 2, by inserting a plurality of connector pins 54 into a plurality of connector sockets 55 with a connector board 53,
Are connected, and the slip ring 21 and the substrate 24 in the drum are electrically connected. Then, as shown in FIG. 1, when the plurality of connector pins 54 are pulled out from the plurality of connector sockets 55 by the connector board 53, the connectors 52 are separated, and the gap between the slip ring 21 and the board 24 in the drum is formed. Will be disconnected.

At this time, if the slip ring harness 51 is made of a flexible wire or a flexible cable, the mounting position of the plurality of connector sockets 55 on the drum substrate 24 is shifted, and the drum substrate relative to the upper drum 1 is rotated. The displacement of the mounting position of the drum 24 can be absorbed, and the cost can be reduced by increasing the tolerance in manufacturing and assembling the substrate 24 inside the drum.

Further, by mounting the plurality of connector pins 54 in parallel with the connector board 53 and mounting the plurality of connector sockets 55 in parallel with the connector board 53, the plurality of connector pins Since the pins 54 can be simultaneously inserted into and removed from the plurality of connector sockets 55, the operation of connecting and disconnecting the connectors 52 can be easily performed with one touch.

As described above, in the rotating head drum of the present invention, the slip ring 21 and the substrate 24 in the drum are electrically detachably connected by the connector 52.
When replacing the slip ring 21, as shown in FIG.
The slip ring 21 can be easily removed from the drum shaft 5 and the rotating flange 7 simply by removing the plurality of mounting screws 23 and pulling out the plurality of connector pins 54 of the connector 52 from the plurality of connector sockets 55. Also, as shown in FIG. 1, a new slip ring 21 can be attached by simply inserting a plurality of connector pins 54 of a connector 52 into a plurality of connector sockets 55 and tightening a plurality of mounting screws 23, so that the slip ring 21 is It can be easily attached to the shaft 5 and the rotating flange 7. At this time, the slip ring base 22 is fitted to the upper end 5a of the drum shaft 5 by the fitting hole 22a, and the mounting screw 23 is inserted from the screw insertion hole 22b to be screwed into the tapped screw hole 7a. Tighten and fasten. Therefore, when the slip ring 21 is detached, the plurality of slip ring harnesses 51
It is not necessary to perform any troublesome solder demounting work in a narrow space for soldering and unsoldering to the substrate 24 inside the drum.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made based on the technical concept of the present invention. For example, it is possible to replace the plurality of connector pins 54 and the connector socket 55 with the connector board 53 and the board 24 in the drum in a reverse arrangement. Further, the connector socket 55 or the connector pin 54 is
Are mounted on another connector board connected by a plurality of harnesses (or flexible cables), and these connector sockets 55 or connector pins 54 are mounted on the connector board 53 of the slip ring 21 on the slip ring harness 51 side. It can also be configured to be able to be freely inserted into and removed from a plurality of connector pins 54 or connector sockets 55. In this case, it is preferable that the connector substrate 53 on the side of the slip ring harness 51 be fixed to the slip ring base 22 or the like with screws or the like.

[0021]

The rotary head drum of the present invention configured as described above has the following effects.

According to a first aspect of the present invention, when the slip ring configured to be detachable from the drum shaft is replaced, the slip ring is electrically connected to and separated from the substrate in the drum that is rotated integrally with the drum shaft by a connector. This eliminates the need for soldering in a narrow space on a plurality of soldering lands of the substrate in the drum, which was conventionally required, so that the slip ring can be assembled or replaced. Work time can be greatly reduced by greatly reducing the number of work steps at the time, and cost reduction can be promoted. Also, since the solder demounting work at the time of assembling or replacing the slip ring can be made unnecessary, the flux (gas) generated during the soldering work adheres to the surface of the slip ring, causing poor conduction and contact with the brush. There is no danger of a secondary defect such as an increase in resistance, and a high-quality rotary head drum can be realized.

According to the second aspect, since the connector is constituted by the plurality of connector pins and the connector socket, the structure and the manufacturing are simple.

According to a third aspect of the present invention, one of the plurality of connector pins or connector sockets and the slip ring are connected by a flexible wire or a flexible cable, and the other of the plurality of connector sockets or connector pins is connected to the drum substrate. Since it is fixed, the displacement of the mounting position of the substrate in the drum can be absorbed by a flexible wire or a flexible cable, and the cost can be reduced by increasing the tolerance in manufacturing and assembling the substrate in the drum. .

According to a fourth aspect of the present invention, one of the plurality of connector pins or connector sockets is mounted in parallel with the connector board, and the plurality of connector sockets or connector pins are mounted in parallel with the board in the drum. The connector socket can be simultaneously inserted and removed by the connector board, and the operation of connecting and disconnecting the connector at the time of replacing the slip ring or the like can be performed with one touch, and the operation of replacing the slip ring can be performed even more easily.

[Brief description of the drawings]

FIG. 1 is an enlarged cross-sectional view of a main part showing a separated state of a connector portion in a rotary head drum according to an embodiment of the present invention.

FIG. 2 is an enlarged sectional view of a main part showing a connection state of a connector part of FIG. 1;

FIG. 3 is a sectional view showing the entire rotary head drum according to the first embodiment;

FIG. 4 is a plan view of FIG. 3;

FIG. 5 is a sectional view showing a conventional rotary head drum.

FIG. 6 is a plan view of FIG. 5;

[Explanation of symbols]

1 is a rotary upper drum, 5 is a drum shaft, 21 is a slip ring, 23 is a mounting screw, 24 is a substrate in the drum, 38 is a brush, 51 is a slip ring harness, 52 is a connector,
53 is a connector board, 54 is a connector pin, and 55 is a connector socket.

Claims (4)

[Claims] 1. A slip ring which is arranged on the same center line as a drum shaft and is detachably attached to the drum shaft, and is mounted on an upper part of a rotating upper drum which rotates integrally with the drum shaft. A rotary head drum comprising: a substrate in the drum; and a connector for electrically detachably connecting the slip ring and the substrate in the drum. 2. The rotary head drum according to claim 1, wherein said connector comprises a plurality of connector pins and a plurality of connector sockets into which said plurality of connector pins are detachably inserted. 3. A connection between one of the plurality of connector pins or connector sockets and the slip ring by a flexible wire or a flexible cable, and the other of the plurality of connector sockets or connector pins is a substrate in the drum. 3. The fixing device according to claim 2, wherein
A rotating head drum as described. 4. The method according to claim 1, wherein one of the plurality of connector pins or connector sockets is mounted on the connector board in parallel, and the other of the plurality of connector sockets or connector pins is mounted on the drum board in parallel. The rotary head drum according to claim 2 or 3, wherein