JP3244616B2 - Flexible wiring board - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flexible wiring board wound around a cylindrical surface.

[0002]

2. Description of the Related Art In the field of scientific instruments, especially nuclear magnetic resonance apparatuses, electrical wiring is drawn from a cylindrical surface to a plane not parallel to the cylindrical axis. For example, as shown in FIG. 8, an electronic element 2 such as a sensor or a coil is arranged on an upper part of a cylindrical bobbin 1 having a flat flange 5 at a lower part, and is drawn out along a cylindrical surface by a lead wire 3 to be placed on a plane. Is connected to the connector 4 by soldering or the like.

[0003]

In the case of the wiring as shown in FIG. 8, when the number of electronic elements is small, the element and the connector are connected by a cable, or a printed board (hereinafter, referred to as a connector) attached to the lower part of the cylinder. RPC) may be arranged, and the element and the RPC may be connected by a wire. However, in a magnetic field correction device of a nuclear magnetic resonance apparatus, when the number of elements is very large, for example, when the number of electronic elements becomes large, such as exceeding 100, this method becomes extremely troublesome, and when soldering, The risk of poor connection and incorrect wiring increases.

As shown in FIG. 9, when a capacitor is connected between each lead wire and the ground as a countermeasure against electromagnetic wave interference, the number of capacitors must be twice as large as the number of electronic elements. It becomes extremely troublesome if
It is extremely difficult when wiring in a narrow part is required.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and can easily lead out electric wiring from a cylindrical surface to a plane which is not parallel to a cylindrical axis. It is an object of the present invention to provide a flexible wiring board which can make external capacitors unnecessary.

[0006]

SUMMARY OF THE INVENTION The present invention relates to a wiring board for drawing electrical wiring from a cylindrical surface to a plane not parallel to a cylindrical axis, comprising: a first portion wound around a cylindrical surface; A second portion having a portion extending in the axial direction and extending along the cylinder at the same curvature as the first portion; and a third portion extending from the second portion and having a connector mounting portion at a distal end portion. And The present invention also relates to a wiring board for drawing electrical wiring from a cylindrical surface to a plane not parallel to the cylindrical axis, wherein the first part is wound around the cylindrical surface, and the first part extends from the first part and is bent to form a cylindrical shaft. A second portion facing the direction and a third portion extending from the second portion and having a connector mounting portion at a distal end portion are provided.

[0007]

According to the present invention, the width of the wiring pattern is increased to form a capacitor between the cylindrical bobbin or between the wiring and the conductive foil film to eliminate the need for an external capacitor as a measure against radio interference. A flexible wiring board, a part extending from the cylindrical surface, and a part that is not parallel to the cylindrical axis are formed by one flexible wiring board. It can be pulled out with a flexible wiring board, and wiring can be facilitated, and connection failure and incorrect wiring can be eliminated.

[0008]

FIG. 1 is a view for explaining an embodiment of the flexible wiring board of the present invention. The electronic element 2 is arranged on the surface of the cylindrical bobbin 1 with the flange 5 attached to the lower portion, and a single-sided flexible wiring board (hereinafter, referred to as FPC) is used as a lead line, and the base material 10 of the FPC is attached to the cylindrical surface. Put on
The copper foil pattern 11 of the FPC is formed relatively thick and connected to the RPC 12 disposed on the flange 5. The cylindrical bobbin 1 in the present embodiment is made of a metal such as aluminum, for example, and a capacitor is formed by the bobbin and the copper foil pattern with an FPC base material, which is an insulating thin film, interposed therebetween. Therefore, a capacitor for countermeasures against radio interference as shown in FIG. 9 can be eliminated.

FIG. 2 shows another embodiment of the present invention. This embodiment is basically the same as the case of FIG. 1, but as shown in the enlarged view of FIG.
A copper foil pattern 11 is formed on both sides of the conductive bobbin 1 and a thin insulating material 13 is interposed between the conductive bobbin 1 and one side thereof.
The difference from the case of FIG. 1 is that capacitors are formed on both sides of the FPC substrate 10 by laminating a ground pattern copper foil 14 on the other surface of the PC substrate 10 with an insulating material 13 therebetween. It is not necessary to provide an external capacitor.

In the embodiments shown in FIGS. 1 and 2, the FPC and the RPC are connected by a wire, and the problem of a large number of connecting portions cannot be solved. Therefore, a flexible wiring board in which the problem of connection between the FPC and the RPC is solved and the FPC and the RPC are formed by one wiring board will be described with reference to FIGS. FIG. 3 is a view showing one embodiment of the flexible wiring board of the present invention. FIG. 3A is a developed view of the flexible wiring board 20 of the present embodiment, and FIG. 3B is a perspective view showing a state where the flexible wiring board 20 is wound around a bobbin and a connector portion is arranged on a flange. In FIG. 3A, a flexible wiring board 20 is wound around a bobbin, and a bobbin winding portion A that forms a capacitor as described above has an A
Is wound around the bobbin to form a portion B along the cylinder with the same curvature, and a portion C along the cylinder axis, which can be bent without being affected by the curvature of the cylinder, is formed ahead of the portion B. And a connector mounting portion D is formed at the tip. The boundary line between the portions B and C is a line parallel to the cylinder axis. When this flexible wiring board 20 is wound around a cylindrical surface and bent so that the connector portion is arranged on the flange, as shown in FIG. Become. In order to bend the wiring board without adding distortion, it must be bent only in one direction at all times, and the portion B must not be bent in the other direction. Since the bobbin winding section and the drawer section are formed by a single wiring board, the problem of connection between the FPC and the RPC can be solved. The portion B in FIG. 3A may extend in an oblique direction other than the direction parallel to the cylinder axis and may extend along the cylindrical surface.

FIG. 4 shows another embodiment of the present invention. This embodiment is basically the same as the case of FIG. 3 except that a plurality of drawer portions and connector attachment portions are provided, and is suitable for a case where a wiring board is wound around a bobbin a plurality of times. In this embodiment, a drawer is formed from the bobbin winding portion through a portion along the cylinder, but a portion B along the cylinder is common, and a portion C is branched therefrom to form a plurality of connector mounting portions. May be formed.

FIG. 5 is a diagram showing another embodiment of the present invention. In this embodiment, the portion B along the cylinder is the bobbin winding portion A.
The same width as, from which direction perpendicular to the cylindrical axis (side)
A drawer C is provided. FIG. 6 is a diagram showing another embodiment of the present invention. In the present embodiment, the bobbin winding part A is an example of a narrow width that does not make a round of the cylinder, and the cut E has no width and is a cut line.

FIG. 7 shows another embodiment of the present invention. FIG. 7A is an example in which the portion C does not extend in a direction perpendicular to the portion B but extends in an oblique direction, and FIG. ), Which can be used by bending the pattern.

In each of the above embodiments, the drawer is provided below the bobbin winding part A.
It goes without saying that this may be on the upper side, and that the pattern of each of the above embodiments may be of an opposite shape to the left and right.

[0015]

As described above, according to the present invention, when the wiring is drawn from the cylindrical surface to a plane not parallel to the cylindrical axis, the width of the wiring pattern is increased to form a capacitor. As a countermeasure, an external capacitor is not required, and the part to be wound around the cylindrical surface and the lead-out part are composed of a single flexible wiring board. It can be eliminated.

[Brief description of the drawings]

FIG. 1 is a diagram showing an embodiment of the present invention which does not require an external capacitor.

FIG. 2 is a diagram showing another embodiment that does not require an external capacitor.

FIG. 3 is a view showing one embodiment of the flexible wiring board of the present invention.

FIG. 4 is a view showing another embodiment of the flexible wiring board of the present invention.

FIG. 5 is a view showing another embodiment of the flexible wiring board of the present invention.

FIG. 6 is a view showing another embodiment of the flexible wiring board of the present invention.

FIG. 7 is a view showing another embodiment of the flexible wiring board of the present invention.

FIG. 8 is a diagram showing a conventional example in which electric wiring is drawn from a cylindrical surface to a plane not parallel to the cylindrical axis.

FIG. 9 is a diagram showing a conventional example in which a capacitor is connected as a measure against radio interference.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Cylindrical bobbin with flange, 2 ... Electronic element, 3 ... Lead wire, 4 ... Connector, 5 ... Flange, 10 ... FPC base material, 11 ... FPC copper foil, 12 ... Printed circuit board, 13 ... Insulating material, 14 ... Ground Pattern copper foil, 20: flexible wiring board, A: bobbin winding part, B: part along the cylinder, C: part that can be bent without being affected by the curvature of the cylinder, D
... Connector mounting part.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H05K 1/02

Claims (2)

(57) [Claims] 1. A wiring board for drawing electrical wiring from a cylindrical surface onto a plane not parallel to the cylindrical axis, the wiring board having a first portion wound around the cylindrical surface, and a portion extending from the first portion in the cylindrical axis direction. A flexible wiring board, comprising: a second portion extending along the cylinder at the same curvature as the first portion, and a third portion extending from the second portion and having a connector mounting portion at a distal end portion. 2. A wiring board for drawing electrical wiring from a cylindrical surface onto a plane not parallel to the cylindrical axis, wherein the first portion is wound around the cylindrical surface, and extends from the first portion and is bent to extend in a cylindrical axial direction. And a third portion extending from the second portion and having a connector mounting portion at a distal end portion.
A flexible wiring board comprising: