JPS61160801A - Rotary magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To suppress the generation of noises by securing a lamination structure a signal pattern is enclosed by a shielding pattern for a flexible print wire board. CONSTITUTION:A rotary drum 8 containing plural video heads 7 is provided together with a fixed drum 1 containing a tape guide and a rotary transformer 5 containing transformers 5a and 5b at the fixed side and the rotary sides respectively. A flexible print wire board 19 is led out to the outside of the drum 1 from the transformer 5a. The board 19 has a lamination structure where signal patterns 14a, 14b, 15a and 15b are enclosed by shielding patterns 16a and 16b. An end of those signal patterns is connected to an enamel wire 13 of the transformer 5a with the end at the other side connected to a preamplifier. Thus the external noises are cut off by the patterns 16a and 16b. This reduces greatly the mixture of noises into the signal patterns.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a rotary magnetic recording and reproducing apparatus, and particularly to a rotary magnetic recording and reproducing apparatus that is intended to reduce noise intrusion from the outside.

[Background of the invention]

Conventionally, it has been known to use a flexible printed wire board as a wire drawn out from a rotary transformer of a rotating magnetic recording/reproducing device and guided to the outside of a fixed drum (Japanese Utility Model Publication No. 58-193311). By adopting such a configuration, wire processing becomes extremely easy and workability is improved.

However, such a rotating magnetic recording/reproducing device does not take into account noise from the outside entering the flexible printed wire board through which minute signals flow, and therefore has the problem of appearing as noise on the screen.

[Purpose of the invention]

An object of the present invention is to solve the above-mentioned problems of the prior art and to provide a rotating magnetic recording/reproducing device with very little noise.

[Summary of the invention]

The rotating magnetic recording/reproducing device according to the present invention has a rotating drum having at least one video head and a fixed drum, and includes a rotating rotary transformer and a fixed rotary transformer inside, and has an electric signal. In a rotating magnetic recording/reproducing device, the rotating magnetic recording/reproducing device is equipped with a rotary transformer for contactless transmission, and is formed by wiring a flexible printed wire board drawn out from the fixed side rotary transformer and guided to the outside of the fixed drum. The board has a laminated structure in which a signal pattern is wrapped in a shield pattern.

[Embodiments of the invention]

Hereinafter, the present invention will be explained by examples.

FIG. 1 is a sectional view of a rotating magnetic recording/reproducing device according to an embodiment of the present invention, FIG. 2 is a side view showing details of the fixed rotary transformer and flexible printed wire board in FIG. 1, and FIG. is the ■ arrow view in Figure 2, the 4th
The figure is a developed view showing the state of the flexible printed wire board in FIG. 2 before lamination, FIG. 5 is a sectional view taken along the line v-■ in FIG. FIG. 2 is a schematic diagram for explaining a method of molding a printed wire board.

The outline of the rotating magnetic recording/reproducing apparatus of this embodiment includes a rotating drum 8 having a plurality of video heads 7, a fixed drum 1 provided with a tape guide, a fixed rotary transformer 5a inside, and a rotating drum 8. The flexible printed wire board 19 is equipped with a rotary transformer 5 consisting of a rotary transformer 5b, and a flexible printed wire board 19 that is drawn out from the fixed side rotary transformer 5a and guided to the outside of the fixed drum 1. 1
9, signal butter/14a, 14b, 15a.

15b is wrapped in shielding patterns 16a and 16b to form a laminated structure.

To explain this rotating magnetic recording and reproducing device in more detail,
It has one fixed drum, a ball bearing 3.4 for holding the shaft 2, and a circular rotor IJ for contactless transmission of electrical signals.) Holds the fixed side rotary transformer 5a of the lance 5. . The enameled wire 13 wound around the fixed rotary transformer 5a is joined by soldering to a flexible printed wire board 19 (details will be described later) having a laminated structure, and the flexible printed wire board 19 is guided to the outside of the fixed drum 1. is,
connected to a preamplifier (not shown). On the other hand, a disk 6 that holds the rotating side rotary transformer 5b of the rotary transformer 5 and is fixed to the upper part of the shaft 2 has a
A rotating drum 8 to which a plurality of video heads 7 are attached is removably fixed with screws 9. and,
A rotary transformer 10 is fixed to the lower end of the shaft 2 to obtain the driving force for rotating the shaft 2,
On the other hand, a stator 12 having a coil 11 is fixed to the fixed drum 1 .

The flexible printed wire board 19 is formed of copper foil on a base 18 of a soft material (for example, polyimide), and has signal patterns 14a, 14b, and 15a whose surface is covered with a protective film 17.

15b, viewed from above and below, is a shielding pattern 16a which is formed into a planar shape of copper foil on a base 18 made of a soft material, and whose surface is covered with a protective film 17.

It is a band-shaped wire having a width W and having elastic flexibility and has a three-layer structure wrapped by a wire 16b.

To explain the method of forming the flexible printed wire board 19, first, as shown in FIG. Folding part 18
On the signal pattern forming portion 18e of the base 18 on which the patterns a and 18b are formed, signal patterns 14a and 14 of a predetermined shape are formed.
b+15a+15b, and the folding part 18a,
A planar shielding pattern 16a is formed on 18b.
, 16b are all formed of copper foil, and are covered with a protective cover 17 (eg, polyimide). Then, as shown in FIG. 6(a), the folding portion 18a is folded in the entry direction, and the folding portion 18b is folded in the B direction, thereby forming the signal pattern 14a.

14 b, 15 a, and 15 b are laminated so as to be wrapped by shield patterns 16 a, 16 b,
The surfaces that are stacked and in contact are bonded together by thermocompression.

Flexible print wide configured like this Yapo X19 signal patterns 14a and 14b.

One end side of 15a, 15b is a fixed side rotary transformer 5a.
By connecting the other end to the enameled wire 13 and using the preamplifier, external noise is blocked by the shielding patterns 16a, 16b, and the signal patterns 14a, 14b.

Noise entering 15a and 15b is significantly reduced.

According to the embodiment described above, the flexible printed wire board 19 is connected to the signal pattern 14a.

14 b, 15 a, and 15 b are wrapped in the shield patterns 16 a, 16 b in a laminated structure,
This has the effect of significantly reducing noise intrusion. In addition, flexible printed wire board 19
Since it has sufficient elastic flexibility, wire processing is easy and the workability is not deteriorated.

Other embodiments will be described below.

FIG. 7 is a developed view showing a state before lamination of a flexible printed wire board of a rotating magnetic recording/reproducing device according to another embodiment of the present invention, and FIG. FIG. 3 is a schematic diagram illustrating a method of forming a board.

As shown in FIG. 7, the flexible printed wire board 19A of this embodiment has a flexible printed wire board 19A on one side in the width direction of the signal pattern forming section 18e.
A signal pattern 14a having a predetermined shape is formed on a signal pattern forming portion 18e of a base 18A in which folded portions 13c and 18d (each having a width W) are successively formed.

14 b, 15 a, 15 b, and on the folded portions 18 C, 18 d, planar shield patterns 16 C, 16 d are all formed of copper foil, and a protective cover (not shown) is placed on top of the planar shield patterns 16 C, 16 d. As shown in FIG. 8(a), the folding part 18
C in the C direction, and as shown in FIG. 8(b), the folding part 18d is folded in the D direction, and the signal putter 7
14a, 14b, 15a.

15b is laminated so as to be wrapped by shielding patterns 16C and 16d, and the surfaces of the laminated and abutted surfaces are bonded by thermocompression.

FIG. 9 is a developed view showing a state before lamination of a flexible printed wire board of a rotary magnetic recording/reproducing device according to still another embodiment of the present invention, and FIG. FIG. 3 is a schematic diagram for explaining a method of molding a wire board.

The flexible 7-pull printed wire board 19B of this embodiment is the flexible 7-pull printed wire board 19B according to FIG.
Shielding pattern 16a.

In place of 16b, shield butter 716a', 16b' cut into a mesh shape is formed of copper foil. And this flexible printed wire board 1
The molding method of 9B is completely the same as the method shown in FIG. 6 described above, and the explanation thereof will be omitted.

The flexible printed wire board 19B constructed in this manner has the advantage that, like the flexible printed wire board 19 shown in FIG. 4, the flexibility is further improved and wire processing becomes extremely easy.

〔Effect of the invention〕

As described above in detail, according to the present invention, it is possible to provide a rotary magnetic recording/reproducing device with very little noise.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a rotating magnetic recording/reproducing device according to an embodiment of the present invention, FIG. 2 is a side view showing details of the fixed rotary transformer and flexible printed wire board in FIG. 1, and FIG. is the ■ arrow view in Figure 2, the 4th
The figure is a developed view showing the state of the flexible printed wire board in FIG. 2 before lamination, FIG. 5 is a sectional view taken along the line v-■ in FIG. FIG. 7 is a schematic diagram for explaining a method for molding a printed wire board, and FIG. 7 is a developed view showing a state before lamination of a flexible printed wire board of a rotating magnetic recording/reproducing device according to another embodiment of the present invention. FIG. 8 is a schematic diagram for explaining a method of forming a flexible printed wire board from the state shown in FIG. 7, and FIG. FIG. 10, which is a developed view showing the state of the pull printed wire board before lamination, is a schematic diagram for explaining a method for forming a flexible printed wire board from the state shown in FIG. 9. 1... Fixed drum, 5... Rotary transformer, 5a
. . . Fixed side rotary transformer, 5b . . . Rotating side rotary transformer, 7 . , 16a', 16b', 16
C. 16d... Shield pattern, 19, 19A. No./(!l No. 2 No. 4 No. 70 Back No. 9

Claims (1)

[Claims] 1. It has a rotating drum having at least one video head and a fixed drum, and has a rotary transformer inside thereof, which consists of a rotary transformer on a rotating side and a rotary transformer on a fixed side, for transmitting electrical signals without contact. A rotating magnetic recording/reproducing device comprising a flexible printed wire board drawn out from the fixed rotary transformer and guided to the outside of the fixed drum, wherein the flexible printed wire board has a signal pattern with a shielding pattern. A rotating magnetic recording/reproducing device characterized by having a wrapped laminated structure.