JPH01267806A - Magnetic recording/reproducing device - Google Patents

Abstract

PURPOSE:To eliminate the need for a metal plate, etc., as a shield member and to reduce space by extending one part of the flexible printed circuit board of an interface part so as to cover a head part and forming a shield pattern. CONSTITUTION:One part of a flexible printed circuit board 4 for an interface to connect a mechanism part, a switch part, etc., with a control circuit part is extended to form a shield pattern 4a to give electro-magnetic shielding effect. The flexible printed circuit board 4 is so composed as to function as the shield member for a head 2 between it and a control circuit substrate 5. Thus, the flexible printed circuit board 4 itself becomes a shield means between the head 2 and the control circuit substrate 5, it is unnecessary to specially provide a shield plate 7, etc., and the space can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an electromagnetic interference protection means in an electronic device such as a magnetic recording/reproducing device that performs magnetic recording and/or reproduction.

(Prior Art) Conventionally, in electronic equipment that performs magnetic recording/reproduction, the magnetic head section that controls the recording/reproduction is extremely sensitive to electrical or magnetic noise, so it is required to use so-called electromagnetic shielding ( For example, as shown in Figure 3, which is an exploded perspective view of the main part around the magnetic recording/reproducing head of an example of a conventional device, there is a method of covering that part with a metal plate or the like. It was commonly taken.

In the figure, 1 indicates a deck chassis of a magnetic recording/reproducing device, 2 a magnetic recording/reproducing head, 3 lead wires,
Reference numeral 4 denotes a flexible printed (wiring) board, which connects the mechanism section (not shown), the switch 6, and the control circuit board 5. Further, 7 indicates the metal shield plate specially provided to cover the head 2.

[Problem to be solved by the invention]

However, in the conventional example as described above, a metal component called the shield plate 7 was separately added, and therefore a certain amount of man-hours and space were required for its arrangement.

Furthermore, since the magnetic head 2 must move during recording/reproducing operations, the shield plate 7 had to be kept away from the range of movement of the head so as not to interfere with its movement to prevent contact, short circuits, etc. . Therefore, when viewed as a unit, a relatively large space is required.

[! Means to solve one problem] Therefore, in the present invention, the mechanism part.

A part of a flexible printed circuit board for an interface for connecting a switch section etc. and a control circuit section is extended to form a shield pattern to provide an electromagnetic shielding effect, and the flexible printed circuit board is used as a control circuit board. The object is to be achieved by configuring the head to function as a shield member between the head and the head.

(Function) With the above configuration, the flexible printed circuit board itself forms an electromagnetic shielding member between the magnetic recording/reproducing head and the control circuit board, so there is no need to separately provide a conventional shield plate. In addition, since both sides of the flexible printed circuit board are coated with an imageless coating, short circuits will not occur even if the flexible printed circuit board comes into contact with the control circuit board or each lead wire to some extent. has a large degree of freedom.

〔Example〕

The present invention will be explained below based on examples.

1 and 2 are related to one embodiment of the present invention, FIG. 1 is an exploded perspective view of the main part around the magnetic recording/reproducing head, and FIG. 2 is a sectional view of the main part, The third conventional example
The same (equivalent) components as in the figures are represented by the same reference numerals.

(Structure) In FIG. 1.2, 1 to 6 are the same as those in FIG. 3, but 1 is a deck chassis of the magnetic recording/reproducing apparatus, 2 is a magnetic recording/reproducing head, 3. Each lead wire 4a is a shield pattern part extended from a part of the interface flexible printed circuit board 4 so as to cover the head 2 according to the present invention, and a pattern (not shown) such as an inner copper foil is formed on both sides. It is laminated with insulating resin, and has a round hole and a semicircular notch for fixing, into which a pair of cylindrical anchors 8 protruding from the chassis 1 are inserted and restrained in position. ing. 5
is a control circuit board, and 6 is a switch.

In order to drive various switches, motors, etc. provided on the deck section 1, it is necessary to connect each to each driver, but when using the flexible printed circuit board 4 as an interface section for this purpose, it is necessary to connect the various switches and motors provided on the deck section 1 to each driver. The interface flexible board 4 is located between the control board 5 and the control board 5. Therefore, in the present invention, when a part of the interface flexible board 4 is extended as shown in the figure to form a shield pattern part 4a that covers the head 2 part, the flexible board 4 itself is connected to the head 2 and the control circuit board 5. This eliminates the need to separately provide a shield plate 7 or the like as in the conventional example.

Further, the shield pattern 4a can be easily grounded to a ground line (not shown) if necessary, and noise, hum, etc. can be prevented.

〔Effect of the invention〕

As explained above, according to the present invention, a part of the flexible printed circuit board of the interface part is extended to cover the head part to form a shield pattern, so that it can be used as a shield member that was required in the conventional example. This eliminates the need for metal plates, etc. Furthermore, since both sides of the flexible printed circuit board are usually laminated with an insulating material, there is no problem even if the flexible printed circuit board comes into contact with the control circuit board, lead wires, etc. to some extent. Moreover, shielding can be achieved simply by changing the shape of the flexible printed circuit board used as the interface, which also leads to cost reduction.

Furthermore, unlike a metal plate, there is no need to strictly float it so as not to contact the substrate or lead wires as described above, and the shape can be changed arbitrarily, so there is an extremely large degree of freedom in design in terms of space.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of the main parts around the head of an embodiment of the present invention, FIG. 2 is a sectional view of the main parts of the embodiment shown in FIG. 1, and FIG. 3 is the main parts around the head of an example of a conventional device. It is a partially exploded perspective view. 1...Deck part chassis 2...Magnetic recording/reproducing head 4...Flexible printed circuit board 4a...
...Shield pattern 5...Control circuit board

Claims (2)

[Claims] (1) In an electronic device that performs magnetic recording and/or reproduction using a recording/reproducing head, a shield pattern is formed on a part of a flexible printed circuit board that passes near the head to electromagnetically shield the head. A magnetic recording/reproducing device characterized by: (2) Claim 1 characterized in that the shield pattern of the flexible printed circuit board is connected to a ground line.
The magnetic recording/reproducing device described above.