JP3030187U - Circuit board structure - Google Patents

Abstract

(57) Abstract: To provide a circuit board structure capable of reliably preventing a tracking phenomenon at low cost. A slit 20 is provided between a positive electrode 13 and a negative electrode 14 for power supply, which are connected to a wiring 12 of a circuit board 11.

Description

[Detailed description of the device]

[0001]

[Technical field to which the device belongs]

 The present invention relates to a circuit board structure, and more particularly, to a circuit board structure capable of reliably preventing a tracking phenomenon at a low cost.

[0002]

[Prior art]

 Generally, in various electric products, a printed wiring formed on a circuit board is provided with a plus electrode and a minus electrode for power supply. The positive electrode and the negative electrode are connected to a power supply cord of a plug which is plugged into an outlet, and when the plug is inserted into the outlet, power is supplied to the circuit board.

By the way, in such an electric product, when the plug is left inserted in the outlet, a tracking phenomenon in which a current starts to flow between the plus electrode and the minus electrode via moisture or dust adhering to the circuit board is wide. Are known. If this tracking phenomenon is left unattended, the circuit board may be heated and an electrical product may catch fire. For this reason, in order to prevent the tracking phenomenon, in the conventional circuit board, the creepage distance of the circuit board between the positive electrode and the negative electrode is increased by setting the dimension between the positive electrode and the negative electrode large. Various methods such as a method (conventional example 1) or a method of applying a moistureproof agent between the positive electrode and the negative electrode (conventional example 2) have been made.

[0004]

[Problems to be solved by the device]

 However, in Conventional Example 1, there is an upper limit on the dimension between the plus electrode and the minus electrode depending on the shape and size of the circuit board, and thus it may not be applicable. On the other hand, in Conventional Example 2, there is a problem that a complicated moisture-proofing material coating process is required during the manufacturing process of the electric product, which increases the manufacturing cost of the electric product. The present invention has been made to solve such a conventional problem, and an object thereof is to provide a circuit board structure capable of reliably preventing a tracking phenomenon at low cost.

[0005]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention provides a circuit board structure for electrically insulating between a positive electrode and a negative electrode for power supply connected to a wiring of a circuit board, wherein the positive electrode and the negative electrode are provided. The feature is that slits are provided between the electrodes. In this case, as the slit, the creepage distance of the circuit board between the plus electrode and the minus electrode may be increased, and for example, the slit may be substantially I-shaped. For example, the width dimension may be as large as possible, for example, 1 mm. All you have to do is set the above.

In the present invention, since the slit is provided between the plus electrode and the minus electrode, there is no fear that moisture, dust, etc. will adhere between the plus electrode and the minus electrode, and the tracking phenomenon can be reliably performed. It can be prevented. Further, in the present invention, by appropriately selecting the shape and form of the slit, it is possible to have a great influence on the manufacturing cost of electric products regardless of the shape and size of the circuit board. The above object is achieved by an extremely simple structure in which a slit is provided between the positive electrode and the negative electrode.

[0007]

[Embodiment of device]

 FIG. 1 shows an embodiment according to the present invention. The circuit board structure 10 in this embodiment is applied to a circuit board 11 of an electric product, and a printed wiring 12 formed on the circuit board 11 is provided with a plus electrode 13 and a minus electrode 14 for power supply. . The positive electrode 13 and the negative electrode 14 are connected to power supply cords 15 and 16 of plugs that are inserted into unillustrated outlets, and the power is supplied to the circuit board 11 by inserting the plugs into the outlets.

In the circuit board structure 10 of this embodiment, the slit 20 is provided between the plus electrode 13 and the minus electrode 14. The slit 20 is formed in a substantially I shape having a width of 1 mm from the edge of the circuit board 11. Since each of the corners 21 of the slit 20 is rounded, a crack is generated from each of the corners 21 even when the circuit board 11 is subjected to a breaking stress so that the plus electrode 13 and the minus electrode 14 become steps. There is no fear.

According to the circuit board structure 10 of the present embodiment, since the slit 20 is provided between the plus electrode 13 and the minus electrode 14, moisture and dust may adhere between the plus electrode 13 and the minus electrode 14. In addition to this, the creepage distance between the positive electrode 13 and the negative electrode 14 can be lengthened, so that the tracking phenomenon can be reliably prevented. Further, since the circuit board structure 10 prevents the tracking phenomenon by a very simple structure in which the slit 20 is provided between the plus electrode 13 and the minus electrode 14, the circuit board structure 10 is related to the shape and size of the circuit board 11 as in the past. And does not significantly affect the manufacturing cost of electrical products.

It should be noted that the present invention is not limited to the above-described embodiments, and improvements, modifications and the like within the scope of achieving the present invention are included in the present invention. For example, although the slit is formed in a substantially I-shape in the above-mentioned embodiment, it may be formed in a substantially T-shape, a substantially L-shape, etc., and the shape and size of the circuit board, plus It may be appropriately selected depending on the arrangement of the electrodes and the minus electrodes. In addition, the materials, shapes, dimensions, forms, numbers, locations, etc. of the circuit boards, wirings, positive electrodes, negative electrodes, slits, etc. shown in the above-mentioned embodiments are arbitrary as long as the present invention can be achieved, Not limited.

[0011]

[Effect of device]

 According to the present invention, the tracking phenomenon can be reliably prevented at low cost.

[Brief description of drawings]

FIG. 1 is a schematic view showing an embodiment of the present invention.

[Explanation of symbols]

 10 Circuit Board Structure 11 Circuit Board 12 Wiring 13 Positive Electrode 14 Negative Electrode 20 Slit

Claims (1)

[Scope of utility model registration request] 1. A circuit board structure for electrically insulating between a positive electrode and a negative electrode for power supply connected to a wiring of the circuit board, wherein a slit is provided between the positive electrode and the negative electrode. A circuit board structure characterized in that