JPH05129736A - Printed substrate - Google Patents

Abstract

PURPOSE:To provide the title printed substrate capable of avoiding the shortcircuit and mis-operation during the adjusting step of the characteristics of electric circuit for enhancing the quality as well as the workability, besides, reducing the packaging manhours for cutting down the cost furthermore, enabling the electric elements to be surface-packaged for making profitable in terms of practical application and mass production. CONSTITUTION:A circuit pattern 4 comprising a conductor foil 3 is provided on an insulating substrate 2. Next, resistors 5, 6 as electric elements 5, 6 are connected to the circuit pattern 4 in parallel state. Next, a cutting hole 7 located inside the cutting position of the conductor foil 3 is formed on the insulating substrate 2 opposite to the outer edge thereof so that the conductor foil 3 may be cut off togehter with the insulating substrate 2 to cut off the specific resistor 6 from the circuit pattern 4. Through these procedures, the insulating substrate 2 and the conductor foil 3 are cut off toward the hole 7 using tools etc., so as to cut off the resistor, 6 from the, circuit pattern 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printed circuit board which can be used in various electronic devices such as telephone devices and whose electric circuit characteristics can be adjusted.

[0002]

2. Description of the Related Art Conventionally, a printed circuit board having a structure shown in FIG. 3 is generally used for mass production of telephone devices. As shown in FIG. 3, a printed circuit board 51 is provided with a circuit pattern 54 made of a conductor foil 53 on an insulating substrate 52, resistors 55 and 56 are connected in parallel to the circuit pattern 54, and the resistor 56 is further a jumper. The line 57 is detachably connected to the circuit pattern 54.

Then, by cutting the jumper wire 57 with a tool such as a nipper, the resistor 56 is connected to the circuit pattern 54.
It can be adjusted to increase the listening volume level.

[0004]

However, in the structure of the conventional example as described above, the cut jumper wire 57 is short-circuited with the electric elements on the printed circuit board 51, the circuit pattern 54, the casing of the telephone device, or the like. There was a problem that other jumper wires might be accidentally cut. Further, since the jumper wire 57 mounts a discrete type electric element, there is a problem that it hinders the surface mounting of the electric element on the printed board 51, and that mounting equipment and man-hours are required.

The present invention solves such a conventional problem, and can prevent a short circuit and an erroneous operation when adjusting the characteristics of an electric circuit to improve the quality and improve the workability. In addition, it is possible to reduce the cost by reducing the mounting equipment and the number of mounting steps, and further, the electric element can be surface-mounted, which is advantageous in practical use and mass production. It is intended to provide a substrate.

[0006]

The technical means of the present invention for achieving the above object is to provide a circuit pattern made of a conductor foil provided on an insulating substrate and characteristics of an electric circuit connected to the circuit pattern. A plurality of electric elements for adjusting the electric element, among these electric elements, so as to cut the conductor foil together with the insulating substrate to separate the desired electric element from the circuit pattern, on the outer edge of the insulating substrate. On the other hand, it is provided with a hole for cutting formed inside the cut portion of the conductor foil.

Another technical means of the present invention for achieving the above object is to adjust the characteristics of a circuit pattern made of a conductor foil provided on an insulating substrate and an electric circuit connected to this circuit pattern. A plurality of electronic elements, and among these electric elements, formed on the insulating substrate so as to cut off a part of the conductor foil together with a part of the insulating substrate to separate a desired electric element from the circuit pattern. And a groove for excision.

[0008]

Therefore, according to the present invention, the conductor foil is cut together with the insulating substrate toward the cutting hole with a tool, or a part of the conductor foil is used together with a part of the insulating substrate in the cutting groove. Since it is cut off by bending it and the characteristics of the electric circuit are adjusted, the jumper wire as in the past is not necessary. Along with this, it is possible to prevent a short circuit and an erroneous operation, reduce the mounting equipment and the mounting man-hour, and further, surface mount the electric element.

[0009]

(Embodiment 1) A first embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a partially enlarged plan view showing a printed circuit board according to a first embodiment of the present invention.

In the present embodiment, a printed circuit board used in a telephone device and adapted to adjust the reception volume will be described. As shown in FIG. 1, the printed circuit board 1 is an insulating substrate 2.
A circuit pattern 4 composed of a conductor foil 3 is provided on the top by printing. Resistors 5 and 6 are connected in parallel to the circuit pattern 4. In order to cut the resistor 6 from the circuit pattern 4, the conductor foil 3 is cut together with the insulating substrate 2,
A hole 7 for cutting is formed in the insulating substrate 2 at the inner side of the cut portion of the conductor foil 3 with respect to the outer edge thereof.

Then, by using a tool or the like, the insulating substrate 2 and the conductor foil 3 forming the circuit pattern 4 are cut from the outer edge of the insulating substrate 2 toward the hole 7 to a desired width indicated by X, whereby the resistor 6 is cut. Is separated from the circuit pattern 4. This makes it possible to reduce the resistance value and increase the reception sound volume level.

By forming the hole 7 into an oval shape or the like in advance by punching or the like as in this embodiment, the cut portion can be made clear and the insulating substrate 2 or the like can be cut when the insulating substrate 2 or the like is cut. Can be prevented from being damaged.

(Second Embodiment) A second embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 is a partially enlarged plan view showing a printed circuit board according to the second embodiment of the present invention.

In this embodiment as well, as in the first embodiment, a printed circuit board which is used in a telephone device and which adjusts the reception sound volume will be described. In this embodiment, the first embodiment will be described. The same parts as those in FIG.

As shown in FIG. 2, a part of the conductor foil 3 connected to the circuit pattern 4 for disconnecting the resistor 6 from the circuit pattern 4 is diverted so as to project toward the outer edge of the insulating substrate 2. A groove 8 for cutting is formed by cutting out so as to leave the bypass portion so that it can be cut along with a part of the insulating substrate 2 in the middle of the bypass portion.

Then, the insulating substrate 2 is bent by utilizing the cutting groove 8 and the outer portion of the cutting groove 8 of the insulating substrate 2 is cut together with the bypass portion of the conductor foil 3 as indicated by Y. By doing so, the resistor 6 is separated from the circuit pattern 4. This makes it possible to reduce the resistance value and increase the reception sound volume level.

According to this embodiment, the excision groove 8 makes it possible to clarify the excision site, and it is possible to excise and adjust the reception volume without using a tool or the like.

[0020]

As described above, according to the present invention, a conductor foil is cut together with an insulating substrate toward a cutting hole with a tool or a part of the conductor foil is cut together with a part of the insulating substrate. The jumper wire as in the conventional case is not necessary because the characteristics of the electric circuit are adjusted by cutting off the groove using the groove. Along with this, it is possible to prevent short-circuiting and erroneous work, improve quality, and improve workability. Further, it is possible to reduce the cost by reducing the mounting equipment and the mounting man-hours. Further, the surface mounting of the electric element is advantageous in practical use and mass production.

[Brief description of drawings]

FIG. 1 is a partially enlarged plan view showing a printed circuit board according to a first embodiment of the present invention.

FIG. 2 is a partially enlarged plan view showing a printed circuit board according to a second embodiment of the present invention.

FIG. 3 is a partially enlarged perspective view showing a conventional printed circuit board.

[Explanation of symbols]

 1 Printed Circuit Board 2 Insulating Board 3 Conductor Foil 4 Circuit Pattern 5 Resistor 6 Resistor 7 Hole for Cutting 8 Groove for Cutting

Claims (2)

[Claims] 1. A circuit pattern made of a conductor foil provided on an insulating substrate, a plurality of electric elements for adjusting characteristics of an electric circuit connected to the circuit pattern, and a desired one of these electric elements. For cutting the conductor foil with the insulating substrate so as to separate the electric element from the circuit pattern, the cutting being formed at the inner side of the cut portion of the conductor foil with respect to the outer edge of the insulating substrate. Printed circuit board with holes. 2. A circuit pattern made of a conductor foil provided on an insulating substrate, a plurality of electric elements for adjusting characteristics of an electric circuit connected to the circuit pattern, and a desired one of these electric elements. A cutting groove formed in the insulating substrate so as to cut a part of the conductor foil together with a part of the insulating substrate to separate the electric element from the circuit pattern.