JP2560075B2 - Temperature control section protection case - Google Patents

Description

TECHNICAL FIELD The present invention relates to a protective case for a temperature control unit such as an electric blanket.

2. Description of the Related Art A conventional temperature control unit protective case used for an electric heating device, such as an electric blanket controller, is usually used in a bedroom or the like where cotton dust is likely to occur.
In order to improve usability, it is desirable to make the method as small as possible.Therefore, by adopting a dustproof structure, the distance between copper foils in a specific area on the back surface of the printed circuit board is set to 1.5mm or more, which is the shortest value based on the Electrical Appliance and Material Control Law. To reduce the size of the printed circuit board.

That is, the one developed by the present inventors has a flat portion B10 provided on the case A2 as shown in FIG. 7, and this flat portion B10 is a printed circuit board as shown in FIG. 8 and FIG. The backside 6 of the No. 4 receives an area where dust does not want to enter, that is, the outermost entire circumference 11 of the specific area. Further, on the case B3, as shown in FIG. 10, a protrusion 12 for pressing the outermost entire circumference 11 of the specific area of the back surface 6 of the printed board 4 against the flat surface portion B10 of the case A2 from the front surface 5 of the printed board 4 is provided. Case A2 as shown in Fig. 11 provided at specified intervals.
When the case B3 and the case B3 are combined, the printed board 4 is pushed in the direction of the case A2 by the protrusion 12 of the case B3 so that the outermost entire circumference 11 of the specific area on the back surface 6 of the printed board 4 is made into the case A2.
The specific area of the back surface 6 of the printed circuit board 4 is shielded from the outside air by being pressed and brought into close contact with the flat surface portion B10 of FIG.

However, in the case of the above configuration, if there is no through hole reaching the front surface 5 of the printed board 4 in the specific area of the back surface 6 of the printed board 4, the specific area of the back surface 6 of the printed board 4 is completely Although it is considered to have a dust-proof structure that is shielded from the outside air, depending on the type of electric blanket, case A2 and case B3 are the same as shown in Fig. 12, but some parts may change due to a change in control function. Since the through holes 14 reaching the front surface 5 of the printed circuit board 4 may be formed in a specific area of the back surface 6 of the printed circuit board 4 due to the elimination of the holes, dust can enter through the through holes 14, and therefore electrical appliances can be provided. Based on the Control Law, the distance between the copper foils in the specific area on the back surface 6 of the printed circuit board 4 must be 2.5 mm or more instead of 1.5 mm or more.
There is a problem in that one type of printed circuit board 4 cannot be used for various types of electric blankets, which impairs mass productivity.

The present invention solves the above problems and provides a temperature control unit protection case that can use one type of printed circuit board and one type of protection case for various types of heat collecting tools.

Means for Solving the Problems The present invention, in order to solve the above problems, a temperature control unit protective case of the present invention, a flat printed board having a portion that can be a through hole, and the printed board of the same surface Of the case A and the printed circuit board having at the bottom a plane portion A that receives the entire innermost periphery of a portion that can be a through hole in the specific area of the back surface and a plane portion B that receives the outermost entire periphery of the specific area of the back surface of the printed circuit board And a case B having protrusions for pressing the outermost entire periphery of a specific region on the back surface on a flat surface portion B of the case A from the front surface of the printed circuit board at predetermined intervals. The configuration is such that the A and the flat portion B are pressed and brought into close contact at the same time.

With the above configuration, when there is a through hole in the specific region on the back surface of the printed circuit board, when the printed circuit board is placed inside and the case A and the case B are combined, the projections of the case B are used to print. Since the substrate is pushed toward the case A, the outermost entire periphery of the specific area on the back surface of the printed circuit board is brought into close contact with the corresponding flat portion B of the case A, and at the same time, the flat portion A of the case A becomes the flat portion B. Since they are on the same surface, the innermost entire circumference of the through hole on the back surface of the printed circuit board also comes into close contact with the flat surface portion A of the case A.

Therefore, the specific region of the back surface of the printed circuit board except the through holes is shielded from the outside air, and dust does not enter.

Examples Hereinafter, one example of the present invention will be described in detail with reference to the drawings. The same components as those of the conventional example are denoted by the same reference numerals.

FIG. 1 is a cutaway perspective view of a temperature control part protection case in the case where there is a through hole in this embodiment, and in this embodiment, an electric blanket controller will be particularly described.

In FIG. 1, the case A2 is provided with a flat surface portion A9 and a flat surface portion B10 so as to receive the back surface 6 of the printed circuit board 4, and the flat surface portion A9 specifies the back surface 6 of the printed circuit board 4 as shown in FIG. It is adapted to receive the innermost entire circumference 15 of the through hole 14 in the area, and the plane portion B10 is adapted to receive the outermost entire circumference 11 of the specific area on the back surface 6 of the printed circuit board 4. Further, the plane portion A9 and the plane portion B10 are on the same plane as shown in FIG.

Further, in FIG. 1, the case B3 has the same structure as the case B3 in the conventional example, and is provided with a protrusion 12 for pressing the printed circuit board 4 in the direction of the case A2. This protrusion 12 is shown in FIG. Corresponding to the outermost entire circumference 11 of the specific area of the back surface 6 of the printed circuit board 4, the predetermined intervals are provided as shown in FIG. Further, as shown in FIG. 4, the length of the projection 12 is taken into consideration in the variation at the time of molding, the variation at the time of assembly, etc., before the contact of the fitting surface 13 around the case A2 and the case B3 with the printed circuit board. It is set so as to hit the surface 5 of 4.

By doing so, when the fitting surfaces 13 around the case A2 and the case B3 come into contact with each other as shown in FIG. 5, the projection 12 has a compressive stress such that the tip of the projection 12 collides with the surface 5 of the printed circuit board 4 and is crushed. Occurs, and the repulsive force pushes the printed circuit board 4 toward the case A2. Therefore, the outermost entire circumference 11 of the specific area of the back surface 6 of the printed circuit board 4 is
Although it comes into close contact with the flat surface portion B10 of A2, since the flat surface portion B10 and the flat surface portion A9 are on the same surface, at the same time, at the same time, the innermost entire circumference 15 of the through hole 14 in the specific area of the back surface 6 of the printed board 4 Also comes into close contact with the flat part A9.

Therefore, since the specific area of the back surface 6 of the printed circuit board 4 excluding the through holes 14 is shielded from the outside air, dust does not enter, and the distance between the copper foils in the specific area of the back surface 6 based on the standards of the Electrical Appliance and Material Control Law. Can be designed over 1.5 mm. Further, as shown in FIG. 6, even if the component 16 is mounted in the through hole 14 and the foot of the component 16 goes out from the back surface 6, the through hole 14
Since the space immediately below is a space, the feet of the parts enter this space and do not hit the flat surface portion A9 of the case A2. Therefore, the innermost entire circumference 15 of the through hole 14 on the back surface 6 of the printed circuit board 4 is in the flat surface portion A9 of the case A2. Through holes in the back surface 6 of the printed circuit board 4 that are still in close contact
Specified areas except 14 are shielded from the outside air and dust does not enter.

Therefore, the printed circuit board 4 may have the same size whether or not there is a through hole in the specific region of the back surface 6 of the printed circuit board 4, so that the controller of the electric blanket, that is, only one type of printed circuit board is required, and mass productivity is improved. To do.

EFFECTS OF THE INVENTION As described above, according to the present invention, it is possible to make the dimensions of the printed circuit board the same whether or not there is a through hole in the specific area on the back surface of the printed circuit board. Even if there are several types, one type is sufficient, and mass productivity is improved.

[Brief description of drawings]

FIG. 1 is a cutaway perspective view of a temperature control part protection case showing an embodiment of the present invention, FIG. 2 is a plan view of case A of the protection case, and FIG. 3 is a sectional view of case A of the protection case. 4 and 5 are cross-sectional views showing a fitted state of the protective case,
FIG. 6 is a sectional view showing a main part of the protective case in which components are mounted in through holes of a printed circuit board, FIG. 7 is a cutaway perspective view of a conventional temperature control part protective case, and FIG. 8 is the same protective case. A plan view of case A of the case, FIG. 9 is a cross-sectional view of case A of the same protective case, FIG. 10 is a plan view of case B of the same protective case, and FIG. 11 is a cross section showing a fitted state of the same protective case. Figure, first
FIG. 12 is a cutaway perspective view when the printed circuit board of the protective case has a through hole. 2 ... Case A, 3 ... Case B, 4 ... Printed circuit board, 6 ... Back surface, 9 ... Plane section A, 10 ... Plane section B, 11
…… All around the outermost circumference, 12 …… Protrusions, 14 …… Through holes, 15 …… All around the innermost circumference.

Claims (1)

(57) [Claims] 1. A flat printed circuit board having a portion which can be a through hole, a plane portion A which receives on the same plane the entire innermost periphery of a portion which can be a through hole in a specific region on the back surface of the printed circuit board, and a print. A case A having at its bottom a flat portion B for receiving the outermost entire periphery of a specific area on the back surface of the board, and a flat portion B of the specific area on the rear surface of the printed circuit board for the flat portion B of the case A. And a case B having protrusions that are pressed from the case B at predetermined intervals, and the printed circuit board is pressed and brought into close contact with the flat portion A and the flat portion B of the case A by the protrusions of the case B.