JPH0896335A - Power source supply contact - Google Patents

Abstract

PURPOSE: To enhance the dimensional accuracy by equipping a flexible board for holding a contact member to be in contact with rotary conductive members. CONSTITUTION: A power source supply device 1 is equipped with a ring holder assembly 16 having rotary conductive members, bearings 17 and 22, a cover 18, a frame 19 and the power source supply contact, etc. The ring holder assembly 16 is fitted to a middle drum assembly, and is supported to be rotatable to the frame 19 via the bearings 17 and 22. When the middle drum assembly 16 is rotated together with a shaft, the ring holder assembly 16 is also rotated. This assembly 16 is equipped with plural contact rings 23 as the rotary conductive members, and eight contact rings are disposed at an equal interval. A brush holder 25 is arranged with two brush groups G1 and G2, each having plural contact parts 24. The brush holder 25 is fixed to the frame 19 with screws, and the contact parts as brush-like conductive members 24 are made of gold or a gold alloy.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply contact, and more particularly to a power supply contact used for a rotary magnetic head device of a VTR.

[0002]

2. Description of the Related Art A brush-shaped power supply contact used in a conventional rotary magnetic head device of a VTR contacts a ring-shaped conductive member that rotates together with a rotary drum.

In order to satisfy the function as a contact, the brush-like power supply contact uses expensive gold as a material because of contact resistance with a ring-shaped conductive member. However, what is actually required to be made of gold is only the contact portion where the brush comes into contact with the ring-shaped conductive member, and the portions other than the contact portion need not be made of gold.
FIG. 4 shows a conventional brush, and a tip portion of the brush 300 is a contact portion (contact portion) 330 that contacts the ring-shaped conductive member. An anti-vibration tape 310 is provided in the middle of the brush 300. The brush 300 is fixed by a support portion 320 which is a molded product.

[0004]

However, in the conventional brush, it is necessary to press the brush into contact with the groove of the ring-shaped conductive member (slip ring) to bring it into contact with the groove. It is necessary to have a function. Therefore, the conventional brush needs a certain length from the contact portion in contact with the ring-shaped conductive member to the supporting portion where the brush is supported, and this is made of one wire (material is gold). There is. Therefore, the material cost of the brush becomes very high. Further, when the brush becomes long, there is a problem in that it is difficult to obtain the dimensional accuracy of the brush due to the contraction of the molded portion, which is the support portion of the brush, during molding.

Therefore, the present invention has been made to solve the above problems, and an object of the present invention is to provide a contact for power supply which can reduce the cost and improve the dimensional accuracy. .

[0006]

SUMMARY OF THE INVENTION In the present invention, the above object is to hold a contact portion that contacts the rotating conductive member in a power supply contact that contacts the rotating conductive member that rotates together with the rotating body. This is achieved by the power supply contact provided with the flexible substrate. In the present invention,
Preferably, the contact portion is made of gold, and the contact portion is in contact with the groove of the rotating conductive member. In the present invention, preferably, the rotary body is a rotary drum of a rotary magnetic head device.

[0007]

According to the above construction, the contact portion of the power supply contact which comes into contact with the groove of the rotary conductive member is held by the flexible substrate, and only this contact portion is made of, for example, expensive gold. Moreover, the contact for power supply is
The flexible substrate can exert the same spring pressure as the conventional brush-shaped contact point, and unlike the conventional contact point, there is no need to make it with a long brush, so there is no problem in obtaining dimensional accuracy.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings. The examples described below are
Since it is a preferred specific example of the present invention, various technically preferable limitations are attached, but the scope of the present invention is, unless otherwise stated to limit the present invention, in the following description.
It is not limited to these modes.

FIG. 1 shows an axial cross section of a rotary magnetic recording device (also called a rotary magnetic drum device or a rotary magnetic head device) to which a preferred embodiment of a power supply contact of the present invention is applied. FIG. 2 is a plan view of the rotary magnetic recording device of FIG. 1 viewed from above.

1 and 2, the rotary magnetic recording apparatus has a power supply device 1, an upper drum 2, an intermediate drum assembly 3, a lower drum 6, a shaft 9, a motor 40, a drum support 14 and the like. The drum support 14 is attached to the lower drum 6 with screws, and the upper drum 2 is positioned and fixed to the drum support 14 with screws. The drum structure in this rotary magnetic recording apparatus is a three-layer structure including an upper drum 2, a middle drum assembly 3, and a lower drum 6. The shaft 9 is integrated with the middle drum assembly 3 and is provided with bearings 12 and 15.
It is rotatably supported by the lower drum 6 and the motor housing 11. The middle drum assembly 3 is a rotating drum, and the upper drum 2 and the lower drum 6 are fixed drums.
The middle drum assembly 3 has a circuit board and the like.

The rotary transformer 7 has a rotor core and a stator core. The rotor core is integrated with the middle drum assembly 3 and rotates with the rotation of the middle drum assembly 3. On the other hand, the stator core is integrated with the lower drum 6. By rotating the rotor core with respect to the stator core, a signal is supplied to the magnetic head 4 of the middle drum assembly 3, or a VTR is supplied.
A signal obtained from the tape via the magnetic head 4 can be exchanged without contact.

The magnetic heads 4 are recording / reproducing heads, and one or more magnetic heads 4 are set for the middle drum assembly 3. With this magnetic head 4, a signal can be recorded on the VTR tape by, for example, a helical scan method. It is also possible to reproduce the signal recorded on the VTR tape via the magnetic head 4. Alternatively, the magnetic head 4 may be a read-only head.

The motor 40 has a motor coil 8, a motor rotor magnet 10 and a motor housing 11. By energizing the motor coil 8 of the motor 40, the shaft 9 integrated with the motor rotor magnet 10, the middle drum assembly 3 attached to the shaft 9,
Motor rotor magnet 10, FG, PG rotor 13
Can be rotated via bearings 12, 15. The FG and PG rotor 13 is attached to the lower end side of the shaft 9. The FG, PG rotor 13 is a motor 40
For detecting the rotation angle and the phase of each.

As shown in FIG. 1, the power supply device 1 is arranged on the upper end side of the shaft 9. This power supply device 1 is
This is shown in detail in FIGS. 1 and 2.

In FIG. 2, the power supply device 1 has a ring holder assembly 16 having a rotating conductive member, bearings 17 and 22, a cover 18, a frame 19, a power supply contact 40 and the like. Middle drum assembly 3 in FIG.
, The ring holder assembly 16 of FIG. 2 is attached. The ring holder assembly 16 is rotatably supported by the frame 19 via bearings 17 and 22. When the middle drum assembly 3 rotates with the shaft 9, the ring holder assembly 16 also rotates.

The ring holder assembly 16 includes a contact ring 2 which is also called a slip ring as a plurality of rotating conductive members.
Three. The contact rings 23 are ring-shaped rotating conductive members, and in the example of FIG. 2, the eight contact rings 23 are arranged at equal intervals. Each contact ring 23 is supported at regular intervals by a cylindrical or cylindrical support member 29 made of a non-conductive member that is normally used.
The support member 29 is made of, for example, a non-conductive member such as a molding resin.

The brush holder 25 includes two brush groups G.
1, G2 are arranged. Each brush group G1, G2,
It has a plurality of contact portions 24. In the example of FIG. 2, each of the brush groups G1 and G2 has eight contact portions 24 corresponding to the number of contact rings 23. The brush holder 25 is fixed to the frame 19 via screws. The brush holder 25 is made of a non-conductive member. The frame 19 is fixed so as not to rotate by a detent member attached to the upper drum 2 of FIG. Each brush-shaped conductive member 24 is made of, for example, gold or a gold alloy, and the ring-shaped rotating conductive member 23 also called a contact ring is made of, for example, gold or a gold alloy.

FIG. 3 shows the power supply device 1 shown in FIGS. 1 and 2.
The power supply contact 40 is shown. Power supply contact 4
0 is a contact portion (also referred to as a contact portion) 24, a tape 2
6. It has a flexible substrate F and a supporting portion 25. The contact portion 24 is preferably a portion for contacting the groove of the ring-shaped rotating conductive member 23 shown in FIG. The contact portion 24 has, for example, a circular cross section. The ring-shaped rotary conductive member 23 has, for example, preferably a V-shaped groove. A tape 26 is commonly set on the contact portion 24. The tape 26 is for reducing the vibration of the contact portion 24 as much as possible when the ring holder assembly 16 vibrates due to the rotation.

The contact portion 24 is connected to one end of the flexible substrate F via a tape 26. The other end of the flexible substrate F is connected to the support portion 25. The support portion 25 is, for example, a molded portion.

As is clear from the comparison between the embodiment of the present invention shown in FIG. 3 and the conventional example shown in FIG. 4, the portion other than the contact portion 24 of the power supply contact 40 is replaced with the flexible substrate F so as to be made of gold. The amount of brush-shaped parts used can be significantly reduced. Therefore, the cost of the power supply contact 40 can be significantly reduced.

Further, in the embodiment of the present invention, by using the flexible substrate F, it is possible to make the brush-like portion short while having the same spring pressure as the conventional power supply contact of FIG. Therefore, the brush-shaped portion is only the contact portion 24, and after the support portion 25 is molded, the support portion 25
The contraction of the mold is unlikely to be affected, and the accuracy of the dimensions of the power supply contact 40 can be improved.

In the structure described above, when the motor coil 8 of the motor 40 shown in FIG. 1 is energized, the shaft 9, the middle drum assembly 3 and the ring holder assembly 16 shown in FIG.
Rotates. That is, eight ring-shaped rotating conductive members 23
Rotates in synchronization with the middle drum assembly 3. A power supply means (not shown) is connected to each contact portion 24 via a flexible substrate F. From this power supply means to the circuit board of the middle drum assembly 3 of FIG. 1 via the contact portions 24 and the ring-shaped rotating conductive members 23,
A power supply and an electric signal can be supplied.

In the embodiment of the present invention, as shown in FIG.
A portion in which only the contact portion 24 near the contact point of the ring-shaped conductive member 23 is made into a brush-shaped conductive member, and the characteristic of the material up to the support portion 25 does not matter and only the function as a spring and the function as a conducting wire are required. Is replaced with a flexible substrate F. The rigidity of this flexible substrate F is
The contact portion 24 is set so as to come into contact with the groove of the ring-shaped conductive member 23 with a sufficient spring pressure, that is, a spring pressure satisfying the function of the brush can be obtained. Thus, the embodiment of the present invention has the same function as the conventional power supply contact,
In addition, the material cost can be reduced and the cost can be reduced. Further, by combining the flexible substrate F and the contact portion 24, the brush portion can be shortened as compared with the conventional brush-shaped conductive member, so that the contraction of the mold after the support portion 40 is molded is affected. It becomes difficult, and the dimensional accuracy of the power supply contact 40 can be improved.

The present invention is not limited to the above embodiment. In the above-described embodiment, the contact portion 24 may have a substantially triangular cross section, a quadrangle, a rectangle, a square, etc. in addition to the circular cross section.

In the illustrated embodiment, the power supply contact of the present invention is applied to the rotary magnetic recording device of the VTR device. However, the present invention is not limited to this, and the power supply contact of the present invention can be applied to a rotary magnetic head device such as a VTR rotary magnetic reproducing device. The contact for power supply of the present invention can be applied to a rotary magnetic recording device (recording / reproducing device, reproducing device) such as DAT in addition to the VTR device.
The power supply contact of the present invention is applied when supplying power and / or an electric signal to a region or field other than the rotary magnetic head device of the VTR, for example, a device such as a motor having a rotating body and a fixed portion. It is possible to Further, in the embodiment of FIG. 1, the rotary magnetic recording apparatus exemplifies what is called a three-layer type in which the middle drum rotates, but the present invention is not limited to this, and the power supply contact of the present invention is such that the upper drum is the rotating drum. The present invention can also be applied to a two-layer type rotary magnetic recording device in which the lower drum is a fixed drum.

[0026]

As described above, according to the present invention, the cost can be reduced and the dimensional accuracy can be improved.

[Brief description of drawings]

FIG. 1 is an axial cross-sectional view of a rotary magnetic recording device of a VTR equipped with a preferred embodiment of a power supply contact of the present invention.

FIG. 2 is an enlarged axial sectional view showing a contact for power supply of the rotary magnetic recording apparatus of FIG.

FIG. 3 is an enlarged sectional view showing the power supply contact of FIG.

FIG. 4 is a view showing a conventional power supply contact.

[Explanation of symbols]

 1 Power Supply Device 2 Upper Drum 3 Middle Drum Assembly (Rotating Body) 4 Magnetic Head 6 Lower Drum 9 Shaft 16 Ring Holder Assembly 23 Contact Ring (Round Rotating Conductive Member) 24 Contact Part 40 Power Supply Contact F Flexible Board

Claims (3)

[Claims] 1. A power supply contact for contacting a rotating conductive member that rotates with a rotating body, comprising a flexible substrate for holding a contact portion that contacts the rotating conductive member. 2. The power supply contact according to claim 1, wherein the contact portion is made of gold, and the contact portion contacts a groove of the rotating conductive member. 3. The power supply contact according to claim 1, wherein the rotating body is a rotating drum of a rotating magnetic head device.