JPH05299806A - Printed wiring board - Google Patents

Abstract

PURPOSE:To provide a printed wiring board in which missing of intermediate circuit components, providing subfunctions of a device, can be checked concurretly with main functional test of product. CONSTITUTION:A precircuit 1 constituting main functional section of a device, a post-circuit 2, and an intermediate circuit 3 providing subfunction are mounted on a printed wiring board 4 wherein the precircuit and post-circuit are connected with each other through a conductor pattern 5 formed on the board and the components in the intermediate circuit are soldered to the conductor pattern. In such printed wiring board, the conductor pattern 5 connecting the precircuit and the post-circuit is separated at the joint P of the intermediate circuit and the circuits 1, 2, 3 are interconnected concurrently at the separating point 5c according to the soldering conditions of the components in the intermediate circuit. Since main function of the device is established only when the components in the intermediate circuit are mounted correctly, missing of components in the intermediate circuit can be checked concurrently with functional test of device.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printed wiring board structure applied to an electronic device such as an inverter device.

[0002]

2. Description of the Related Art First, FIG. 7 shows an inverter circuit mounted on a printed wiring board as an example of an embodiment of the present invention. In the figure, reference numeral 1 is a front circuit composed of a rectifying circuit 12 connected to a power source 11, a smoothing capacitor 13 and the like, 2 is a rear circuit composed of an inverter 21, a drive circuit 22 and the like. An inverter circuit is configured with the storage circuit 2 as a main function part. Reference numeral 3 is an intervening circuit that plays a role of a secondary function of absorbing noise generated by the inverter circuit by a noise filter (capacitor) 31. The intervening circuit 3 is provided between the front-end circuit 1 and the rear-end circuit 2. It is branched and connected from.

FIG. 8 is a basic configuration diagram of a conventional printed wiring board applied to the inverter circuit of FIG. 7, in which a space between the front circuit 1 and the rear circuit 2 mounted on the printed wiring board 4 is on the substrate. And the intervening circuit 3 is soldered to a connection point P extending from the middle of the conductor pattern 5.

[0004]

By the way, the product assembled by adopting the printed wiring board having the above-mentioned structure has the following problems in terms of product inspection before shipment. That is, in the assembly process of sequentially mounting the circuit components of the front circuit 1, the rear circuit 2, and the intervening circuit 3 on the printed wiring board 4, the noise filter 31 of the intervening circuit 3 is not mounted due to an error in the assembling work. It may be commercialized. In this case, even if there is no noise filter 31 of the intervening circuit 3 that performs a secondary function, if the front circuit 1 and the rear circuit 2 are connected, the device functions as an inverter, If only the main function inspection is performed in the product inspection, there is a possibility that defective products without a noise filter may pass the inspection and be shipped as they are.

Therefore, conventionally, in order to prevent the shipment of defective products as described above, a special inspection facility for checking whether or not a noise filter is mounted is introduced in addition to the main function inspection at the product inspection stage, or an operator is required. Although this is dealt with by visual inspection, etc., this product inspection causes extra equipment cost and inspection time, which increases the product cost.

The present invention has been made in view of the above points, and an object thereof is to solve the above-mentioned problems and to perform a special inspection for a mounting error of an intervening circuit component (noise filter) having a secondary function as a device. It is to provide a printed wiring board that can be checked simultaneously in a main function inspection without requiring equipment.

[0007]

To achieve the above object, in a printed wiring board according to the present invention, a conductor pattern for connecting a front circuit and a rear circuit mounted on a substrate is connected to an intervening circuit. It is assumed that the circuit is divided at a point and the components of the intervening circuit are soldered over the divided point so that the circuits are interconnected.

Further, there is the following embodiment as a connection structure of the intervening circuit parts to the printed wiring board. (1) Solder the surface mount type component of the intervening circuit across the cut portions of the conductor pattern to interconnect the circuits. (2) A lead insertion hole of a mounted component is opened at a cut portion of the conductor pattern, and a lead mounting type component of an intervening circuit is mounted and soldered to the portion to interconnect each circuit.

(3) The conductor pattern is formed by dividing the conductor pattern into a comb-like shape which is interlaced from both sides, or a curved shape which is uneven.

[0010]

With the above structure, when the components of the intervening circuit are not correctly mounted and soldered on the printed wiring board due to a work mistake in the product assembling process, the front circuit and the rear circuit are connected. Since the conductor pattern remains in the divided state, it does not function as a device at all. Therefore, defects such as missing mounting of intervening circuit components can be checked at the same time by the main function inspection of the product performed after assembly.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. In the drawings of the embodiments, the same members corresponding to those in FIG. 8 are designated by the same reference numerals. FIG. 1 shows a basic configuration of an embodiment of the present invention, in which a front circuit 1, a rear circuit 2 and an intervening circuit 3 mounted on a printed wiring board 4 are divided into a front circuit 1 and a rear circuit 2. The conductor pattern 5 that connects the two is divided into the divided patterns 5
The middle of the conductor pattern is divided so as to be divided into a and 5b, and a connection point P of the intervening circuit 3 is formed at the division point 5c. In addition, the component of the intervening circuit 3 (noise filter 31 in FIG. 7) is the dividing point 5c of the conductor pattern 5 described above.
Are mounted on the printed wiring board 4 in alignment with each other, and the external terminals thereof are soldered so as to bridge between the divided patterns 5a and 5b to electrically connect the circuits 1 to 3 to each other. ..

According to this structure, if the components of the intervening circuit 3 are correctly mounted and soldered to the conductor pattern 5, the circuits 1 to 3 are interconnected and the main function as a device and the sub-function are achieved. The following function is established. On the other hand, when a component of the intervening circuit 3 is missing due to a mounting error in the product assembling process, the front circuit 1 and the rear circuit 2 remain separated, so that the device is not used. The main function is not established either. Therefore, the defect of the product including forgetting to mount the intervening circuit component can be surely checked at the same time only by performing the main function inspection of the product in the inspection after the product is assembled.

Next, a concrete example of mounting the parts of the intervening circuit 3 in the above-mentioned divided portion 5c of the conductor pattern 5 will be described with reference to FIGS. 2 and 3 show an example in which a surface mount type component is adopted as the noise filter 31 (see FIG. 7) which is a component of the intervening circuit 3, and a conductor pattern formed between the front and rear circuits. The external electrode 31a of the noise filter 31 is soldered and joined to the dividing portion 5c so as to straddle between the divided patterns 5a and 5b of 5. As a result, as shown in FIG. 3, the divided patterns 5a and 5b of the conductor pattern 5 are bridged by the joint solder 6 of the noise filter 31, and the front circuit 1, the rear circuit 3, and the intervening circuit 3 in FIG. The three parties will be connected at the same time.

FIG. 4 shows an application example of the divided shape of the conductor pattern 5. In FIG. 4A, the conductor pattern 5 is applied.
At the dividing point 5c, the tip ends of the divided patterns 5a and 5b are formed in a comb-teeth shape that is intertwined with each other from both sides, and in FIG. By forming the divided shape of the conductor pattern 5 in this way, when soldering the components of the intervening circuit, an appropriate solder fillet that spans the three parts of the divided patterns 5a and 5b and the external electrode 31 of the noise filter 31 is provided. Can be formed and soldered.

FIGS. 5 and 6 show an example in which a lead mounting type noise filter 31 is adopted as an intervening circuit component. In this embodiment, a lead insertion hole 4a is preliminarily formed in the cut portion 5c of the conductor pattern 5 formed on the printed wiring board 4, and when the noise filter 31 is mounted on the printed wiring board 4, the lead of the filter is mounted. After the wire 31b is inserted into the hole 4a, the divided patterns 5a and 5b are joined with the solder 6 so as to bridge them as shown in FIG.

It is needless to say that the present invention is not limited to the application of the inverter device shown in the drawing, but can be similarly applied to other various electronic devices. Also,
The dividing position of the conductor pattern is not limited to one, and, for example, when there are a plurality of intervening circuits, the dividing positions may be dispersed and provided as needed.

[0017]

As described above, according to the structure of the present invention, the conductor pattern connecting between the front circuit and the rear circuit mounted on the printed wiring board is divided, and the components of the intervening circuit are placed here. Since soldering is used, if a component in the intervening circuit is forgotten to be mounted due to a work mistake in the product assembly process, the front and rear circuits that make up the main function part of the device will be connected. No, as it is, it does not function at all as a device. Therefore, it is possible to simultaneously check the defect of the product in which the parts of the intervening circuit are omitted by the main function inspection of the device performed after the product is assembled, and thereby, the inspection facility of the product and the inspection work can be greatly simplified.

[Brief description of drawings]

FIG. 1 is a basic configuration diagram of a printed wiring board according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a mounting method when the component of the intervening circuit in FIG. 1 is a surface mount type component.

FIG. 3 is a diagram showing a soldering state of components corresponding to FIG.

4A and 4B show an application example of the divided shape of the conductor pattern in FIG. 1, in which FIG. 4A shows a comb-shaped divided shape, and FIG. 4B shows an uneven curved divided shape.

5 is an explanatory view of a mounting method when the component of the intervening circuit in FIG. 1 is a lead mounting type component.

FIG. 6 is a diagram showing a soldering state of components corresponding to FIG.

FIG. 7 is a circuit diagram of an inverter device illustrating a device mounted on a printed wiring board.

8 is a basic configuration diagram of a conventional printed wiring board including the circuit of FIG.

[Explanation of symbols]

 1 Front-end circuit 2 Post-end circuit 3 Intervening circuit 4 Printed wiring board 5 Conductor pattern 5c Dividing point 6 Joining solder 31 Noise filter (intermediate circuit component) 31a External electrode of surface mounting type component 31b Lead wire of lead mounting type component

Claims (4)

[Claims] 1. A printed wiring board having a front circuit, a rear circuit, and an intervening circuit that fulfills a secondary function, which form the main function part of a device, and which is mounted on a substrate. In which the parts of the intervening circuit are soldered and connected to each other via a conductor pattern, the conductor pattern connecting the front circuit and the rear circuit is connected to the interposer circuit. A printed wiring board characterized in that it is divided into parts and soldered to the parts of the intervening circuit so as to connect the respective circuits to each other. 2. The printed wiring board according to claim 1,
A printed wiring board, characterized in that surface-mounted components of an intervening circuit are soldered to separate portions of a conductor pattern so as to interconnect each circuit. 3. The printed wiring board according to claim 1,
A print characterized in that a lead insertion hole of a mounted component is opened at a cut portion of a conductor pattern, and a lead mounting type component of an intervening circuit is mounted and soldered to the portion to interconnect each circuit. Wiring board. 4. The printed wiring board according to claim 1,
A printed wiring board, characterized in that a conductor pattern is divided into comb teeth shapes that are interlaced from both sides, or an uneven curved shape.