JPH0421224Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a dust-proof structure for a switch board made of an insert molded product.

[Conventional technology]

3 to 5 are explanatory diagrams of the conventional example, FIG. 3 is a plan view before punching holes are punched during molding of the switch board, FIG. 4 is a plan view after punching holes are punched, FIG. 5 is a sectional view of the switch body.

In FIG. 5, 1 is a switch board made of an insert molded product such as a mold, 2a, 2b, and 2c are patterns made of conductive material embedded in a circular pattern;
Reference numeral 3 denotes a slider receiver rotatably supported on the substrate 1 by a shaft 4, and 5 indicates a plurality of sliders made of conductive metal elastic pieces fixed to the back surface of the slider receiver 3. The slider 5 corresponds to each of the patterns 2a, 2b, and 2c, and as the slider receiver 3 rotates, the two contact and separate, or the contact position changes.
Switch contacts are changed.

In order to prevent the patterns 2a, 2b, and 2c from moving within the cavity during insert molding, the patterns 2a, 2b, and 2c are connected by a connecting piece 6 between the patterns 2a and 2b, as shown in FIG.
Connect between patterns 2a and 2b with a connection piece 7, and punch holes 8 and 9 on the connection piece 6 and connection piece 7 after molding as shown in FIG.
It was cut between b and 2c.

[Problem that the invention attempts to solve]

By the way, the switch board 1 as described above has holes 8,
Since holes 9 are drilled, contacts 2 can be connected from the holes 8 and 9.
Dirt and dust may enter the contact surfaces 10 of the circuit boards 1 between the patterns 2a and 2b, 2b and 2c.
This may cause a short circuit between the sliders 5 and the patterns 2a, 2b, and 2c. It is also possible to cover the punched holes 8 and 9 with tape or the like, but this is difficult to work with.
Material costs are also high.

The present invention aims to solve the above-mentioned conventional drawbacks.The purpose of the present invention is to provide a dustproof structure for a switch board that prevents dirt and dust from entering between each pattern and between a pattern and a slider. This is what we intend to provide.

[Means for solving ideas]

In order to achieve the above-mentioned purpose, the present invention provides a switch board consisting of an insert molded product in which multiple patterns are embedded on the same circumference, and a dust-proof wall is provided inside the punched hole surrounding the contact surface of each pattern. It is provided.

[Effect]

According to the present invention, a dustproof wall is provided inside the punched hole surrounding the contact surface of each pattern of the switch board, so even if dirt or dust enters through the punched hole, it will be blocked by the dustproof wall. No dirt or dust can enter the contact area.

Additionally, there is no need to apply tape or the like to the punched holes as in the past, improving work efficiency and reducing material costs.

〔Example〕

Embodiments of the present invention will be described below with reference to the accompanying drawings.

1 and 2 are explanatory diagrams of an embodiment of the present invention, in which FIG. 1 is a plan view of a switch board, and FIG. 2 is a sectional view of a switch body incorporating the switch board of FIG. 1.

Note that the same parts as in the conventional example shown in FIGS. 3 to 5 are designated by the same reference numerals, and detailed description thereof will be omitted.

The difference between the present invention and the conventional example is that each pattern 2a, 2b,
Dust-proof walls 11 and 12 surround the contact surface 10 of 2c.
The point is that

According to the present invention, even if dirt or dust enters through the punched holes 8 and 9, these will be removed from the dust-proof walls 11 and 1.
2, patterns 2a, 2b, 2c
Therefore, it is possible to prevent short circuits and poor contact between the patterns 2a and 2b and between the patterns 2b and 2c.

In addition, it is possible to eliminate the need to apply tape or the like to the punched holes, resulting in good workability and low material costs.

[Effect of idea]

According to the present invention, since a dustproof wall is provided on the switch board on the inside of the punched hole surrounding the contact surface of each pattern, it is possible to prevent dirt and dust from entering the contact surface of each pattern, and therefore to prevent dust from entering between the patterns. This prevents short circuits and contact failures, ensuring long-term stable functionality.

Further, since the work of applying tape or the like to the punched holes can be omitted, work efficiency is improved and material costs are reduced.

[Brief explanation of the drawing]

1 and 2 are explanatory diagrams of an embodiment of the present invention, in which FIG. 1 is a plan view of a switch board, FIG. 2 is a sectional view of a switch body incorporating the switch board of FIG. 1, and FIG. 5 to 5 are explanatory diagrams of the conventional example. FIG. 3 is a plan view before punching holes are formed during molding of the switch board, FIG. 4 is a plan view after punching holes are formed, and FIG. FIG. 3 is a sectional view of the switch body. 1...Switch board, 2a, 2b, 2c...Pattern, 8, 9...Punching hole, 10...Contact surface,
11, 12...dust-proof wall.

Claims (1)

[Scope of utility model registration request] A switch board made of an insert molded product in which a plurality of patterns are embedded on the same circumference, characterized in that a dustproof wall is provided inside a punched hole surrounding the contact surface of each pattern. Dustproof structure.