JPH11121940A - Protective cover for printed-circuit board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a protective cover which prevents a foreign matter from entering, and in which visibility and operability are made good by a method wherein a quadrangular opening is formed in the central part of the protective cover and four slits whose length is nearly identical are formed radially from four end parts of the opening. SOLUTION: A protective cover 2 for a printed-circuit board is formed of a resin material so as to be thin sheetlike. A quadrangular opening 5 is formed in a part corresponding to a dual in-line package switch or a lamp on the printed-circuit board. Then, slits 61 to 64 are formed radially from four ends of the opening 5. The protective cover 2 is bent in lines which connect tip parts of the slits 61 to 64 so as to be used. Thereby, the dual in-line package switch or the lamp can be seen easily from the upper direction and side parts, and the discriminative property of the setting state of the dual in-line package switch and that of the lamp can be enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a protective cover for a printed circuit board.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 4, a protective cover 2 of a printed circuit board 1 for display operation or the like disposed inside a casing of a fire receiver or the like is for preventing foreign substances from entering from outside. Although it is desirable to cover the entire surface, when the DIP switch 2 and the lamp 3 are mounted on the printed circuit board 1, small openings 5 and 5 are formed only in portions corresponding to these components. .

[0003]

However, the protective cover 2 of the printed circuit board 1 as described above is provided with a dip switch 3
Since the openings 5 and 5 have dimensions slightly larger than the outer shapes of the components such as the lamp 4 and the lamp 4, the setting state of the dip switch 3 and the lighting of the lamp 4 from the direction of arrow B other than directly in front of the openings 5 and 5 (arrow A). -It was sometimes difficult to identify the light-off state. Further, since there is a gap between the openings 5 and 5 and the component, a foreign substance may enter as shown by an arrow C, and the entry may not be completely prevented. Further, when setting or changing the DIP switch 3, the openings 5, 5
In order to change the setting using a setting tool such as an adjustment screwdriver, the setting must be performed from the front, and the workability is not good.

The present invention has been made in order to solve the above-mentioned problems, and an object of the present invention is to provide a protective cover for a printed circuit board which prevents intrusion of foreign matters and has good visibility and operability. Is to do.

[0005]

According to a first aspect of the present invention, there is provided a protective cover for a printed circuit board formed in a thin plate shape, wherein a square-shaped protective cover is provided at a central portion of the protective cover. An opening is provided, and four slits are formed radially from the four ends of the opening with substantially the same length.

According to the second aspect of the present invention, perforations are formed between the tips of the four slits. According to the third aspect of the present invention, there is provided a protective cover for a printed circuit board formed in a thin plate shape, wherein a slit is formed at a central portion of the protective cover, and two slits are radially formed at each end of the slit. Form.

According to a fourth aspect of the present invention, perforations are formed between the tips of the four slits in the third aspect of the invention.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to FIGS. 1A and 1B are diagrams showing a configuration of a protective cover of a printed circuit board, wherein FIG. 1A is a front view, and FIG.
2 is a front view showing a folded state, FIG. 2 is a view showing a state in which a protective cover is attached to a printed circuit board, (a) is a side view, (b) is a front view, and (c) is a perspective view.

The printed circuit board 1 is disposed in a housing of a fire receiver or the like. As shown in FIG. 2A, the printed circuit board 1 includes a dip switch 3 and a lamp 4 such as a light emitting diode. Is arranged. DIP switch 3
For example, in the case of a fire receiver, switching between accumulation and non-accumulation of alarm operation, switching whether or not to notify by sound when a trouble light is lit, or setting a spare line without connecting a sensor as an empty line It is used when switching settings at the time. The lamp 3 is used for displaying the function status of the fire receiver and displaying a trouble.

As shown in FIG. 1 and FIG.
Is formed in a thin plate shape with a resin material,
Square openings 5 and 5 are formed in portions corresponding to the dip switches 3 and the lamps 4 on the printed circuit board. .. 64 are formed radially from the four ends of the openings 5,5. This slit 61, ... 6
4 is used by being bent toward the printed circuit board side at the line connecting the front end portions. If the protective cover 2 is formed to be slightly thicker or made of a material having high rigidity, perforations 71,... 74 are provided to assist the bending, It may be formed in a thin shape to facilitate bending.

FIG. 1B shows the slits 61,.
Is shown in which the protective cover 2 is bent inward. The opening 5 is widened, and as shown in FIG. 2, the opening edges of the openings 5 and 5 come into contact with or close to the side surfaces of the dip switch 3 and the like.

According to the above-described embodiment, as shown in FIG. 2A, the DIP switch 3 and the lamp 4 can be easily viewed from up and down directions (for example, arrow B) and from the side. The state and the distinguishability of the lamp 4 are improved. When the DIP switch 3 or the like is operated, the setting of the DIP switch 3 can be switched by an adjustment driver from an oblique direction other than the front (arrow A). Further, even if foreign matter tries to enter the printed circuit board 1 side, the foreign matter falls outside along the inclined surface of the protective cover 2 as shown by the arrow C, and the foreign matter can be prevented from entering.
The failure of the electric circuit section can be reduced.

Next, a second embodiment will be described with reference to FIG. 3A and 3B are diagrams showing a configuration of a protective cover of a printed circuit board, wherein FIG. 3A is a front view, and FIG. 3B is a front view showing a folded state. This protective cover 2 has a slit 10 without the opening 5 of the first embodiment, and two slits 61, 62, 63, 64 are formed from both ends of the slit 10, respectively. is there. The protective cover 2 is bent and used on a line connecting the distal ends of the slits 61,.
Is made of a thick material or a highly rigid material, the perforations 71,.
74, or the bent portion may be formed in a thin linear shape to facilitate bending.

FIG. 3B shows a state in which the protective cover 2 is bent inward using the slit 10 and the slits 61,... The slit 10 expands, and FIG.
As in (a) and (b), the edge of the slit opened on the side surface of the DIP switch 3 or the like comes into contact with or is positioned.

In the second embodiment, the same effects as those of the first embodiment can be obtained, and the processing of the protective cover 2 is only the formation of the slit 10 and the slits 61,... It will be easier.

[0016]

According to the first aspect of the present invention, the DIP switch and the lamp can be more easily viewed from the up and down directions and the side, and the setting state of the DIP switch and the distinguishability of the lamp can be improved. Further, when operating the dip switch or the like, the setting of the dip switch can be easily switched by an adjustment driver or the like from an oblique direction. Furthermore, even if foreign matter tries to invade the printed circuit board side, the foreign matter falls outside along the inclined surface of the protective cover to prevent the foreign matter from entering, and it is possible to reduce the failure of the electric circuit portion of the printed circuit board. It works.

According to the second aspect of the present invention, in addition to the effect of the first aspect of the present invention, the perforation formed between the tips of the slits has an effect that the protective cover can be easily bent.

According to the third aspect of the present invention, in addition to the effect of the first aspect of the present invention, since the processing of the protective cover only forms the slit, the processing is facilitated.

According to the fourth aspect of the invention, in addition to the effect of the third aspect of the invention, the perforation formed between the tips of the slits has an effect that the protective cover can be easily bent.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a protective cover for a printed circuit board according to a first embodiment of the present invention, where (a) is a front view,
(B) is a front view showing the folded state.

2A and 2B are diagrams showing a state in which the protective cover is attached to a printed circuit board, wherein FIG. 2A is a side view, FIG. 2B is a front view, and FIG.

FIG. 3 is a diagram showing a configuration of a protective cover for a printed circuit board according to a second embodiment of the present invention, where (a) is a front view,
(B) is a front view showing the folded state.

4A and 4B are diagrams showing a state in which a conventional protective cover is attached to a printed circuit board, wherein FIG. 4A is a side view, FIG. 4B is a front view, and FIG. 4C is a perspective view.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Printed circuit board 2 Protective cover 5 Opening 61 ... 64 Slit 71, ... 74 Perforation 10 Slit

Claims (4)

[Claims] 1. A protective cover for a printed circuit board formed in a thin plate shape, wherein a rectangular opening is provided at a central portion of the protective cover, and four slits are formed radially from the four ends of the opening. A protective cover for a printed circuit board characterized by being formed in a length. 2. The printed circuit board protective cover according to claim 1, wherein perforations are formed between the tips of the four slits. 3. A protective cover for a printed circuit board formed in a thin plate shape, wherein a slit is formed in a central portion of the protective cover, and two slits are formed radially at each end of the slit. A protective cover for a printed circuit board. 4. The printed circuit board protective cover according to claim 3, wherein perforations are formed between the tips of the four slits.