JPH049709Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a movable contact piece of a micro rotary switch mounted on a printed wiring board, for example.

As is well known, various types of rotary switches have been developed in recent years that output digital signals as the operating element rotates.

FIG. 1 shows a conventional rotary switch. On the back surface of the operator 11, a plurality of cams 11 ₁ are provided at predetermined intervals in the rotational direction and diametrical direction.
11 ₂ are provided. A holding plate 12 is provided at a predetermined distance from the back surface of the operator 11. This holding plate 12 is provided with through holes 12 ₁ , 12 ₂ , and steel balls 13 , 1 are provided in the through holes 12 ₁ , 12 _{2 .}
4 are provided respectively. Movable contact pieces 15 ₁ and 15 ₂ are provided on the back side of the holding plate 12 and at positions corresponding to the through holes 12 ₁ and 12 ₂ . The movable contact pieces 15 ₁ and 15 ₂ are integrally formed of a single metal plate, and their base ends are connected by a connecting portion 15 ₃ . And this movable contact piece 15 ₁ ,
The steel balls 13 and 14 are held by 15 ₂ .
Further, a substrate 16 is provided at a position a predetermined distance away from the movable contact pieces 15 ₁ and 15 ₂ , and this substrate 16
Fixed contacts 17 and 18 are provided corresponding to the movable contact pieces 15 ₁ and 15 ₂ .

In the above configuration, when the operator 11 is rotated, the cams 11 ₁ and 11 ₂ press and drive the steel balls 13 and 14, and the movable contact pieces 15 ₁ and 15 ₂ are driven by the steel balls 13 and 14. Ru. Thus, the movable contact pieces 15 ₁ and 15 ₂ are brought into contact with the fixed contacts 17 and 18,
A predetermined digital signal is generated.

By the way, the rotary switch has movable contact pieces 15 ₁ , 15 ₂ , 15 ₄ , 15 ₅ as shown in FIG.
The proximal end is bent so that the distal end faces upward. These are movable contact pieces 15 ₁ , 15 ₂ , 15 ₄ , 1
This is to ensure an insulation distance between ₅ and the fixed contact. That is, movable contact pieces 15 ₁ , 15 ₂ , 15 ₄ , 15 ₅
If the movable contact piece 152 is flat as shown in FIG. 3, for example, when the movable contact piece ₁₅₂ is driven, the connecting part ₁₅₃ will also be deformed, and the adjacent movable contact piece ₁₅₁ will also move as shown in FIG. Put it away. Therefore, it becomes difficult to maintain a sufficient insulation distance between the fixed contact and the movable contact piece ₁₅₁ , and erroneous contact is likely to occur due to vibration or the like.

Therefore, as shown in FIG. 2, the movable contact pieces 15 ₁ ,
By bending 15 ₂ , 15 ₄ , and 15 ₅ , a sufficient insulation distance can be ensured even in such a case. However, it is difficult to bend the very small movable contact pieces evenly, and it is difficult to equalize the driving force of each movable contact piece and the contact pressure with the fixed contact.

This invention was made based on the above circumstances, and its purpose is to drive a certain movable contact piece by integrally forming the tips of adjacent movable contact pieces so that they are oriented in opposite directions. Even if the movable contact piece is in contact with the movable contact piece, the movable contact piece that contacts the movable contact piece is not interlocked, so the contact stability is excellent, and the driving force of each movable contact piece and the contact pressure with the fixed contact can be set equally. The purpose is to provide a movable contact piece for a rotary switch.

An embodiment of this invention will be described below with reference to the drawings.

In FIG. 5, movable contact pieces 51 ₁ , 51 ₂ to 51
₅ is formed integrally with a single conductive metal plate 51 by a notch. These movable contact pieces 51 ₁ , 51 ₂ to 51 ₅
The tips of the movable contact pieces 51 ₁ , 51 ₂ to 51 are formed such that adjacent ones are oriented in opposite directions.
Protrusions 51 _{and 6} are formed in the middle portions of each of the protrusions 51 _{and 5} , respectively.

FIG. 6 shows movable contact pieces 51 ₁ , 51 ₂ to 5 having the above configuration.
1 ₅ shows the main parts of the rotary switch to which the switch 61 is attached, and the base 61 has connection terminals 62 and 63.
~66 are provided by insert formation. These connection terminals 62, 63 to 66 are exposed at the inner bottom of the base 61 as shown by diagonal lines, and are binary
Fixed contacts 6 corresponding to decimal codes 1, 2, 4, 8
7, 68 to 70 and a common contact 71.

FIG. 7 shows the base body 61 and the movable contact piece 51 ₁ ,
It shows the state in which 51 ₂ to 51 ₅ are attached,
Projections 51 ₆ of these movable contact pieces 51 ₁ , 51 ₂ to 51 ₅
A predetermined movable contact piece and a fixed contact are brought into contact by being driven by a cam provided on an operator (not shown), and a corresponding digital signal is output.

According to the above configuration, the distal end portions of adjacent movable contact pieces are integrally formed so as to be oriented in opposite directions, and the base end portions of adjacent movable contact pieces are separated. Therefore, even when one movable contact piece is driven, adjacent movable contact pieces are not interlocked, and a sufficient insulation distance from the fixed contact can be ensured, resulting in excellent contact stability.

Further, since adjacent movable contact pieces are not interlocked, there is no need for the conventional work of bending the tips of the movable contact pieces upward. Therefore, it is easy to manufacture the movable contact pieces, and the driving force of each movable contact piece and the contact pressure with the fixed contact can be equalized.

As described in detail above, according to this invention, even when a certain movable contact piece is driven, the movable contact pieces adjacent to that movable contact piece are not interlocked, resulting in excellent contact stability. Furthermore, it is possible to provide a movable contact piece of a rotary switch that can uniformly set the driving force of each movable contact piece and the contact pressure with the fixed contact.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of the main parts of an example of a conventional rotary switch, and FIGS. 2 to 4 are shown to explain conventional movable contact pieces, respectively.
Fig. 2 is a perspective view, Fig. 3 is a top view, Fig. 4 is a front view, Fig. 5 is a top view showing an embodiment of the movable contact piece of a rotary switch according to this invention, and Fig. 6 is a top view of this invention. FIG. 7 is a top view showing the rotary switch shown in FIG. 6 with the movable contact piece shown in FIG. 5 attached thereto. 51... Conductive metal plate, 51 ₁ , 51 ₂ to 51 ₅
...Movable contact piece.

Claims (1)

[Scope of utility model registration request] A single conductor held in the switch case is integrally cut out so that the tips of adjacent comrades are oriented in opposite directions, and a protrusion is provided in the center of each to allow operation. A movable contact of a rotary switch characterized in that as the child rotates, the protrusion is pressed by a cam provided on the operating element and comes into contact with a fixed contact disposed in the switch case, thereby exhibiting a predetermined switch state. Piece.