JPS62177880A - Slip ring - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a slip ring used in a rotating drum of a video tape recorder, particularly a miniaturized head-rotating magnetic recording/reproducing device such as an 8 mm video tape recorder. It is.

2. Description of the Related Art Conventionally, in head-rotating magnetic recording and reproducing devices such as video tape recorders, signal input and output from a rotating head is performed by a rotary transformer placed opposite a rotating drum and a fixed drum. The transformer was formed with grooves whose number of channels corresponded to the number of heads provided on the rotating drum, and a coil was disposed in each groove to correspond to each channel.

Problems to be Solved by the Invention However, with this head signal input/output configuration using a rotary transformer, the rotating drum is downsized, as in 8 mm video tape recorders and digital audio tapes, and recording on the rotating drum is difficult. When a rotating drum has a total of six heads (two heads each, two heads for playback, and two heads for erasing), it is necessary to install six channels of coils in a compact rotary transformer. ,
This has made it difficult to manufacture the rotary transformer, and has caused problems such as increased costs due to decreased productivity.

Means for Solving the Problems The present invention was invented to solve these problems, and in the multi-channel rotating drum described above, the signal system for recording is performed by a rotary transformer,
For the erasing system, a slip ring is used and the slip ring is connected with a brush to form a small and thin slip ring, which is mass-produced.

It is possible to provide the slip ring at a low cost, and its production means is characterized by forming the slip ring in a continuous form, laminating it on a substrate, and then cutting it into pieces to form a single completed slip ring.

EXAMPLE Hereinafter, an example of the present invention will be described based on the accompanying drawings.

FIG. 1 is a plan view showing a slip ring according to the present invention, in which the slip ring l is made of a resin material having a plurality of rings 2 (2a, 2b, 2c) insulated from each other and having wiring terminals 3 with a shaft hole 4a in the center. Alternatively, it is formed by pressing and bonding a substrate 4 made of ceramic or the like through an adhesive layer of a resin film. In the figure, 5 is a hole for head connection wiring provided in the wiring terminal 3, 6, 7, 8.9 are punched holes provided to electrically separate the rings 2a, 2b, 2c which were connected to each other.

Next, the process of manufacturing the slip ring 1 according to the present invention will be explained.

First, in forming the ring 2 of the slip ring 1, the ring 2 is formed by applying A to the Cu base material 10, as shown in FIG.
The material is a clad hoop material 12 on which a noble metal alloy member 11 of g-Au-Pt-Pd is disposed.

Here, the hoop material 12 has a configuration in which a precious metal alloy member 11 is disposed on a hoop-shaped Cu base material 10 having a predetermined width and has a width large enough to accommodate the ring 2 (2c) with the largest diameter. As shown in Figure 2 (b), the structure is such that a noble metal alloy member 11 of about 20 microns is surface-bonded to a Cu base material 11 of about 100 microns thick, and the thickness of the Cu base material 11 is about 100 microns thick. The precious metal alloy member 11 is designed to take into account mechanical bending, waviness, etc., and to take care of the sliding life of the brush and slip ring.

The alloy ratio of the noble metal alloy member 11 is 60% Ag and 60% Au.
20%, Pt15%, Pd5% to reduce Pd,
It is considered to be an easy ratio for alloy composition.

Next, the precious metal alloy part of this hoop material 12 is
), the ring 2 of the slip ring 1 is connected to the connecting portion 14 (14a, 14b, 14c, 14d, l4), respectively.
The shape of the ring 2 is punched out using a press with the remaining parts (f, 14g, l 4h), and the hoop material 12 is continuously stamped together with the frame 13 to form a thin plate-like ring member 15. Here, each ring 2 of the ring member 15 is connected to a third [K].
4 (14a, 14b, 14c.

14d, 14e, 14f, 14g, 14h) and a continuous ring shape connected by a frame 13.

Next, the thin plate-shaped ring member 15 is fixed to the substrate, and the process is shown in FIG. The stacked ring members 15. Film 16. A pressure of 10 kg per 1 cm' was applied to the phenol substrate 17, and 20
By heating at around 0° C., the ring member 15 is laminated and fixed to the phenol substrate 17 by welding the film 16 as shown in the cross-sectional view of FIG. 5, thereby forming a laminated substrate 18 having the rings 2 continuously. It is.

Here, the 111-layer substrate 18 has its upper ring member 15
Puff polishing is applied to the parts to improve contact with the brush.

Next, as a final step, the connecting portion 14 and the frame 13 are punched out from the laminated substrate 18 by pressing to form individual slip rings 1, and each ring 2a, 2b, 2
The ring 2 (2a) is separated and electrically separated and has independent wiring terminals 3.

2b, 2c), the wiring terminal 3 is also provided with a punched tag 5, and the wire of the head is inserted therethrough and soldered.The slip ring 1 is completed.

Note that in the description of the present invention, the case where a resin film was used as the adhesive member was described.

Of course, instead of the resin film, the adhesive member layer may be formed by applying an adhesive to the substrate.

Effects of the Invention Therefore, according to the slip ring according to the present invention having the above-described configuration and steps, a small and thin slip ring can be mass-produced at low cost, and when a rotary transformer is also used. This has the effect of suppressing the increase in cost due to the increase in the number of slip rings.

1. In the description of the present invention, a phenol substrate has been described as a substrate, but the substrate is not limited to this, and a substrate made of ceramic or the like may be used, and the lamination process and press punching process can be performed using i! I! It may be configured to be performed continuously.

[Brief explanation of drawings]

FIG. 1 is a plan view showing a slip ring according to the present invention, FIGS. 2(a) and (b) are plan views and sectional views showing a hoop material used in the present invention, and FIGS. 3(a) and (b). ) is a plan view and a partially enlarged plan view showing a processed state of the present invention, and FIGS. 4 and 5 are an exploded perspective view and a sectional view thereof showing a laminated state of the present invention. l...Slip ring, 2.2a, 2b, 2c...
Ring, 3... Wiring terminal, 12... Hoop material, 15
... Link member, 16... Film, 17... Phenol substrate, 18... Laminated substrate. Patent applicant: Mitsumi Electric Co., Ltd. Figure 2/b) 3rd opening side)

Claims (2)

[Claims] (1) A slip ring characterized by having a laminated structure of a ring member formed from a cladding material, an adhesive member layer, and a substrate member serving as a substrate of the ring member. (2) A step of punching and forming ring members connected to the clad hoop material, a step of laminating and fixing the ring members punched in a connected shape to a substrate member via an adhesive member, and a step of laminating and fixing the ring members to the substrate member via an adhesive member. A slip ring is formed by separating the ring members from each other, punching out the connecting parts between the rings, and providing holes for installation in each ring part.